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authorPetr Mladek <pmladek@suse.com>2021-11-02 10:39:27 +0100
committerPetr Mladek <pmladek@suse.com>2021-11-02 10:39:27 +0100
commit40e64a88dadcfa168914065baf7f035de957bbe0 (patch)
tree06c8c4a9e6c1b478aa6851794c6a33bec1ce6ec4 /kernel
parent24a1dffbecafeb00d8830985eb7a318e37aabc4e (diff)
parent6a7ca80f4033c9cf3003625b2ef8b497f4ec44da (diff)
downloadlinux-40e64a88dadcfa168914065baf7f035de957bbe0.tar.bz2
Merge branch 'for-5.16-vsprintf-pgp' into for-linus
Diffstat (limited to 'kernel')
-rw-r--r--kernel/acct.c2
-rw-r--r--kernel/cgroup/namespace.c2
-rw-r--r--kernel/compat.c21
-rw-r--r--kernel/debug/debug_core.c5
-rw-r--r--kernel/debug/gdbstub.c5
-rw-r--r--kernel/debug/kdb/kdb_bp.c72
-rw-r--r--kernel/debug/kdb/kdb_debugger.c1
-rw-r--r--kernel/debug/kdb/kdb_main.c626
-rw-r--r--kernel/debug/kdb/kdb_private.h18
-rw-r--r--kernel/debug/kdb/kdb_support.c330
-rw-r--r--kernel/dma/Kconfig17
-rw-r--r--kernel/dma/coherent.c161
-rw-r--r--kernel/dma/debug.c21
-rw-r--r--kernel/dma/direct.c74
-rw-r--r--kernel/dma/direct.h8
-rw-r--r--kernel/dma/dummy.c2
-rw-r--r--kernel/dma/mapping.c80
-rw-r--r--kernel/dma/swiotlb.c352
-rw-r--r--kernel/events/core.c2
-rw-r--r--kernel/fork.c98
-rw-r--r--kernel/futex.c190
-rw-r--r--kernel/irq/irqdomain.c1
-rw-r--r--kernel/kcsan/atomic.h23
-rw-r--r--kernel/kcsan/core.c77
-rw-r--r--kernel/kcsan/kcsan_test.c32
-rw-r--r--kernel/kcsan/permissive.h94
-rw-r--r--kernel/kexec.c103
-rw-r--r--kernel/livepatch/transition.c4
-rw-r--r--kernel/locking/rtmutex.c2
-rw-r--r--kernel/locking/rwsem.c10
-rw-r--r--kernel/nsproxy.c2
-rw-r--r--kernel/pid_namespace.c5
-rw-r--r--kernel/profile.c21
-rw-r--r--kernel/sched/core.c6
-rw-r--r--kernel/sched/idle.c4
-rw-r--r--kernel/signal.c2
-rw-r--r--kernel/sys.c40
-rw-r--r--kernel/sys_ni.c6
-rw-r--r--kernel/sysctl.c2
-rw-r--r--kernel/time/namespace.c4
-rw-r--r--kernel/time/posix-timers.c4
-rw-r--r--kernel/trace/Kconfig6
-rw-r--r--kernel/trace/Makefile1
-rw-r--r--kernel/trace/ring_buffer.c8
-rw-r--r--kernel/trace/trace.c36
-rw-r--r--kernel/trace/trace.h18
-rw-r--r--kernel/trace/trace_boot.c311
-rw-r--r--kernel/trace/trace_dynevent.c38
-rw-r--r--kernel/trace/trace_dynevent.h4
-rw-r--r--kernel/trace/trace_eprobe.c904
-rw-r--r--kernel/trace/trace_event_perf.c6
-rw-r--r--kernel/trace/trace_events.c23
-rw-r--r--kernel/trace/trace_events_hist.c157
-rw-r--r--kernel/trace/trace_events_synth.c21
-rw-r--r--kernel/trace/trace_events_trigger.c20
-rw-r--r--kernel/trace/trace_hwlat.c28
-rw-r--r--kernel/trace/trace_kdb.c12
-rw-r--r--kernel/trace/trace_kprobe.c49
-rw-r--r--kernel/trace/trace_osnoise.c22
-rw-r--r--kernel/trace/trace_output.c11
-rw-r--r--kernel/trace/trace_probe.c109
-rw-r--r--kernel/trace/trace_probe.h16
-rw-r--r--kernel/trace/trace_probe_tmpl.h6
-rw-r--r--kernel/trace/trace_synth.h2
-rw-r--r--kernel/trace/trace_uprobe.c40
-rw-r--r--kernel/tracepoint.c4
-rw-r--r--kernel/user.c25
-rw-r--r--kernel/user_namespace.c2
68 files changed, 2977 insertions, 1431 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index a64102be2bb0..23a7ab8e6cbc 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -478,7 +478,7 @@ static void do_acct_process(struct bsd_acct_struct *acct)
/*
* Accounting records are not subject to resource limits.
*/
- flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
+ flim = rlimit(RLIMIT_FSIZE);
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
/* Perform file operations on behalf of whoever enabled accounting */
orig_cred = override_creds(file->f_cred);
diff --git a/kernel/cgroup/namespace.c b/kernel/cgroup/namespace.c
index f5e8828c109c..0d5c29879a50 100644
--- a/kernel/cgroup/namespace.c
+++ b/kernel/cgroup/namespace.c
@@ -24,7 +24,7 @@ static struct cgroup_namespace *alloc_cgroup_ns(void)
struct cgroup_namespace *new_ns;
int ret;
- new_ns = kzalloc(sizeof(struct cgroup_namespace), GFP_KERNEL);
+ new_ns = kzalloc(sizeof(struct cgroup_namespace), GFP_KERNEL_ACCOUNT);
if (!new_ns)
return ERR_PTR(-ENOMEM);
ret = ns_alloc_inum(&new_ns->ns);
diff --git a/kernel/compat.c b/kernel/compat.c
index 05adfd6fa8bf..55551989d9da 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -269,24 +269,3 @@ get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
return 0;
}
EXPORT_SYMBOL_GPL(get_compat_sigset);
-
-/*
- * Allocate user-space memory for the duration of a single system call,
- * in order to marshall parameters inside a compat thunk.
- */
-void __user *compat_alloc_user_space(unsigned long len)
-{
- void __user *ptr;
-
- /* If len would occupy more than half of the entire compat space... */
- if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
- return NULL;
-
- ptr = arch_compat_alloc_user_space(len);
-
- if (unlikely(!access_ok(ptr, len)))
- return NULL;
-
- return ptr;
-}
-EXPORT_SYMBOL_GPL(compat_alloc_user_space);
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index b4aa6bb6b2bd..da06a5553835 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel Debug Core
*
@@ -22,10 +23,6 @@
*
* Original KGDB stub: David Grothe <dave@gcom.com>,
* Tigran Aivazian <tigran@sco.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
*/
#define pr_fmt(fmt) "KGDB: " fmt
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index b6f28fad4307..9d34d2364b5a 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel Debug Core
*
@@ -22,10 +23,6 @@
*
* Original KGDB stub: David Grothe <dave@gcom.com>,
* Tigran Aivazian <tigran@sco.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
*/
#include <linux/kernel.h>
diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
index 2168f8dacb99..372025cf1ca3 100644
--- a/kernel/debug/kdb/kdb_bp.c
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -523,51 +523,51 @@ static int kdb_ss(int argc, const char **argv)
}
static kdbtab_t bptab[] = {
- { .cmd_name = "bp",
- .cmd_func = kdb_bp,
- .cmd_usage = "[<vaddr>]",
- .cmd_help = "Set/Display breakpoints",
- .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
+ { .name = "bp",
+ .func = kdb_bp,
+ .usage = "[<vaddr>]",
+ .help = "Set/Display breakpoints",
+ .flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "bl",
- .cmd_func = kdb_bp,
- .cmd_usage = "[<vaddr>]",
- .cmd_help = "Display breakpoints",
- .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
+ { .name = "bl",
+ .func = kdb_bp,
+ .usage = "[<vaddr>]",
+ .help = "Display breakpoints",
+ .flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "bc",
- .cmd_func = kdb_bc,
- .cmd_usage = "<bpnum>",
- .cmd_help = "Clear Breakpoint",
- .cmd_flags = KDB_ENABLE_FLOW_CTRL,
+ { .name = "bc",
+ .func = kdb_bc,
+ .usage = "<bpnum>",
+ .help = "Clear Breakpoint",
+ .flags = KDB_ENABLE_FLOW_CTRL,
},
- { .cmd_name = "be",
- .cmd_func = kdb_bc,
- .cmd_usage = "<bpnum>",
- .cmd_help = "Enable Breakpoint",
- .cmd_flags = KDB_ENABLE_FLOW_CTRL,
+ { .name = "be",
+ .func = kdb_bc,
+ .usage = "<bpnum>",
+ .help = "Enable Breakpoint",
+ .flags = KDB_ENABLE_FLOW_CTRL,
},
- { .cmd_name = "bd",
- .cmd_func = kdb_bc,
- .cmd_usage = "<bpnum>",
- .cmd_help = "Disable Breakpoint",
- .cmd_flags = KDB_ENABLE_FLOW_CTRL,
+ { .name = "bd",
+ .func = kdb_bc,
+ .usage = "<bpnum>",
+ .help = "Disable Breakpoint",
+ .flags = KDB_ENABLE_FLOW_CTRL,
},
- { .cmd_name = "ss",
- .cmd_func = kdb_ss,
- .cmd_usage = "",
- .cmd_help = "Single Step",
- .cmd_minlen = 1,
- .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
+ { .name = "ss",
+ .func = kdb_ss,
+ .usage = "",
+ .help = "Single Step",
+ .minlen = 1,
+ .flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
},
};
static kdbtab_t bphcmd = {
- .cmd_name = "bph",
- .cmd_func = kdb_bp,
- .cmd_usage = "[<vaddr>]",
- .cmd_help = "[datar [length]|dataw [length]] Set hw brk",
- .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
+ .name = "bph",
+ .func = kdb_bp,
+ .usage = "[<vaddr>]",
+ .help = "[datar [length]|dataw [length]] Set hw brk",
+ .flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
};
/* Initialize the breakpoint table and register breakpoint commands. */
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c
index 0220afda3200..e91fc3e4edd5 100644
--- a/kernel/debug/kdb/kdb_debugger.c
+++ b/kernel/debug/kdb/kdb_debugger.c
@@ -140,7 +140,6 @@ int kdb_stub(struct kgdb_state *ks)
*/
kdb_common_deinit_state();
KDB_STATE_CLEAR(PAGER);
- kdbnearsym_cleanup();
if (error == KDB_CMD_KGDB) {
if (KDB_STATE(DOING_KGDB))
KDB_STATE_CLEAR(DOING_KGDB);
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index d8ee5647b732..fa6deda894a1 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -33,7 +33,6 @@
#include <linux/kallsyms.h>
#include <linux/kgdb.h>
#include <linux/kdb.h>
-#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
@@ -654,16 +653,17 @@ static void kdb_cmderror(int diag)
* Returns:
* zero for success, a kdb diagnostic if error
*/
-struct defcmd_set {
- int count;
- bool usable;
- char *name;
- char *usage;
- char *help;
- char **command;
+struct kdb_macro {
+ kdbtab_t cmd; /* Macro command */
+ struct list_head statements; /* Associated statement list */
};
-static struct defcmd_set *defcmd_set;
-static int defcmd_set_count;
+
+struct kdb_macro_statement {
+ char *statement; /* Statement text */
+ struct list_head list_node; /* Statement list node */
+};
+
+static struct kdb_macro *kdb_macro;
static bool defcmd_in_progress;
/* Forward references */
@@ -671,53 +671,55 @@ static int kdb_exec_defcmd(int argc, const char **argv);
static int kdb_defcmd2(const char *cmdstr, const char *argv0)
{
- struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
- char **save_command = s->command;
+ struct kdb_macro_statement *kms;
+
+ if (!kdb_macro)
+ return KDB_NOTIMP;
+
if (strcmp(argv0, "endefcmd") == 0) {
defcmd_in_progress = false;
- if (!s->count)
- s->usable = false;
- if (s->usable)
- /* macros are always safe because when executed each
- * internal command re-enters kdb_parse() and is
- * safety checked individually.
- */
- kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
- s->help, 0,
- KDB_ENABLE_ALWAYS_SAFE);
+ if (!list_empty(&kdb_macro->statements))
+ kdb_register(&kdb_macro->cmd);
return 0;
}
- if (!s->usable)
- return KDB_NOTIMP;
- s->command = kcalloc(s->count + 1, sizeof(*(s->command)), GFP_KDB);
- if (!s->command) {
- kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
+
+ kms = kmalloc(sizeof(*kms), GFP_KDB);
+ if (!kms) {
+ kdb_printf("Could not allocate new kdb macro command: %s\n",
cmdstr);
- s->usable = false;
return KDB_NOTIMP;
}
- memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
- s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
- kfree(save_command);
+
+ kms->statement = kdb_strdup(cmdstr, GFP_KDB);
+ list_add_tail(&kms->list_node, &kdb_macro->statements);
+
return 0;
}
static int kdb_defcmd(int argc, const char **argv)
{
- struct defcmd_set *save_defcmd_set = defcmd_set, *s;
+ kdbtab_t *mp;
+
if (defcmd_in_progress) {
kdb_printf("kdb: nested defcmd detected, assuming missing "
"endefcmd\n");
kdb_defcmd2("endefcmd", "endefcmd");
}
if (argc == 0) {
- int i;
- for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
- kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
- s->usage, s->help);
- for (i = 0; i < s->count; ++i)
- kdb_printf("%s", s->command[i]);
- kdb_printf("endefcmd\n");
+ kdbtab_t *kp;
+ struct kdb_macro *kmp;
+ struct kdb_macro_statement *kms;
+
+ list_for_each_entry(kp, &kdb_cmds_head, list_node) {
+ if (kp->func == kdb_exec_defcmd) {
+ kdb_printf("defcmd %s \"%s\" \"%s\"\n",
+ kp->name, kp->usage, kp->help);
+ kmp = container_of(kp, struct kdb_macro, cmd);
+ list_for_each_entry(kms, &kmp->statements,
+ list_node)
+ kdb_printf("%s", kms->statement);
+ kdb_printf("endefcmd\n");
+ }
}
return 0;
}
@@ -727,45 +729,43 @@ static int kdb_defcmd(int argc, const char **argv)
kdb_printf("Command only available during kdb_init()\n");
return KDB_NOTIMP;
}
- defcmd_set = kmalloc_array(defcmd_set_count + 1, sizeof(*defcmd_set),
- GFP_KDB);
- if (!defcmd_set)
+ kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
+ if (!kdb_macro)
goto fail_defcmd;
- memcpy(defcmd_set, save_defcmd_set,
- defcmd_set_count * sizeof(*defcmd_set));
- s = defcmd_set + defcmd_set_count;
- memset(s, 0, sizeof(*s));
- s->usable = true;
- s->name = kdb_strdup(argv[1], GFP_KDB);
- if (!s->name)
+
+ mp = &kdb_macro->cmd;
+ mp->func = kdb_exec_defcmd;
+ mp->minlen = 0;
+ mp->flags = KDB_ENABLE_ALWAYS_SAFE;
+ mp->name = kdb_strdup(argv[1], GFP_KDB);
+ if (!mp->name)
goto fail_name;
- s->usage = kdb_strdup(argv[2], GFP_KDB);
- if (!s->usage)
+ mp->usage = kdb_strdup(argv[2], GFP_KDB);
+ if (!mp->usage)
goto fail_usage;
- s->help = kdb_strdup(argv[3], GFP_KDB);
- if (!s->help)
+ mp->help = kdb_strdup(argv[3], GFP_KDB);
+ if (!mp->help)
goto fail_help;
- if (s->usage[0] == '"') {
- strcpy(s->usage, argv[2]+1);
- s->usage[strlen(s->usage)-1] = '\0';
+ if (mp->usage[0] == '"') {
+ strcpy(mp->usage, argv[2]+1);
+ mp->usage[strlen(mp->usage)-1] = '\0';
}
- if (s->help[0] == '"') {
- strcpy(s->help, argv[3]+1);
- s->help[strlen(s->help)-1] = '\0';
+ if (mp->help[0] == '"') {
+ strcpy(mp->help, argv[3]+1);
+ mp->help[strlen(mp->help)-1] = '\0';
}
- ++defcmd_set_count;
+
+ INIT_LIST_HEAD(&kdb_macro->statements);
defcmd_in_progress = true;
- kfree(save_defcmd_set);
return 0;
fail_help:
- kfree(s->usage);
+ kfree(mp->usage);
fail_usage:
- kfree(s->name);
+ kfree(mp->name);
fail_name:
- kfree(defcmd_set);
+ kfree(kdb_macro);
fail_defcmd:
- kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
- defcmd_set = save_defcmd_set;
+ kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
return KDB_NOTIMP;
}
@@ -780,25 +780,31 @@ fail_defcmd:
*/
static int kdb_exec_defcmd(int argc, const char **argv)
{
- int i, ret;
- struct defcmd_set *s;
+ int ret;
+ kdbtab_t *kp;
+ struct kdb_macro *kmp;
+ struct kdb_macro_statement *kms;
+
if (argc != 0)
return KDB_ARGCOUNT;
- for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
- if (strcmp(s->name, argv[0]) == 0)
+
+ list_for_each_entry(kp, &kdb_cmds_head, list_node) {
+ if (strcmp(kp->name, argv[0]) == 0)
break;
}
- if (i == defcmd_set_count) {
+ if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
argv[0]);
return KDB_NOTIMP;
}
- for (i = 0; i < s->count; ++i) {
- /* Recursive use of kdb_parse, do not use argv after
- * this point */
+ kmp = container_of(kp, struct kdb_macro, cmd);
+ list_for_each_entry(kms, &kmp->statements, list_node) {
+ /*
+ * Recursive use of kdb_parse, do not use argv after this point.
+ */
argv = NULL;
- kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
- ret = kdb_parse(s->command[i]);
+ kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
+ ret = kdb_parse(kms->statement);
if (ret)
return ret;
}
@@ -1009,11 +1015,11 @@ int kdb_parse(const char *cmdstr)
* If this command is allowed to be abbreviated,
* check to see if this is it.
*/
- if (tp->cmd_minlen && (strlen(argv[0]) <= tp->cmd_minlen) &&
- (strncmp(argv[0], tp->cmd_name, tp->cmd_minlen) == 0))
+ if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
+ (strncmp(argv[0], tp->name, tp->minlen) == 0))
break;
- if (strcmp(argv[0], tp->cmd_name) == 0)
+ if (strcmp(argv[0], tp->name) == 0)
break;
}
@@ -1024,8 +1030,7 @@ int kdb_parse(const char *cmdstr)
*/
if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
list_for_each_entry(tp, &kdb_cmds_head, list_node) {
- if (strncmp(argv[0], tp->cmd_name,
- strlen(tp->cmd_name)) == 0)
+ if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
break;
}
}
@@ -1033,19 +1038,19 @@ int kdb_parse(const char *cmdstr)
if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
int result;
- if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
+ if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
return KDB_NOPERM;
KDB_STATE_SET(CMD);
- result = (*tp->cmd_func)(argc-1, (const char **)argv);
+ result = (*tp->func)(argc-1, (const char **)argv);
if (result && ignore_errors && result > KDB_CMD_GO)
result = 0;
KDB_STATE_CLEAR(CMD);
- if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
+ if (tp->flags & KDB_REPEAT_WITH_ARGS)
return result;
- argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
+ argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
if (argv[argc])
*(argv[argc]) = '\0';
return result;
@@ -2412,12 +2417,12 @@ static int kdb_help(int argc, const char **argv)
char *space = "";
if (KDB_FLAG(CMD_INTERRUPT))
return 0;
- if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
+ if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
continue;
- if (strlen(kt->cmd_usage) > 20)
+ if (strlen(kt->usage) > 20)
space = "\n ";
- kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
- kt->cmd_usage, space, kt->cmd_help);
+ kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
+ kt->usage, space, kt->help);
}
return 0;
}
@@ -2613,56 +2618,32 @@ static int kdb_grep_help(int argc, const char **argv)
return 0;
}
-/*
- * kdb_register_flags - This function is used to register a kernel
- * debugger command.
- * Inputs:
- * cmd Command name
- * func Function to execute the command
- * usage A simple usage string showing arguments
- * help A simple help string describing command
- * repeat Does the command auto repeat on enter?
- * Returns:
- * zero for success, one if a duplicate command.
+/**
+ * kdb_register() - This function is used to register a kernel debugger
+ * command.
+ * @cmd: pointer to kdb command
+ *
+ * Note that it's the job of the caller to keep the memory for the cmd
+ * allocated until unregister is called.
*/
-int kdb_register_flags(char *cmd,
- kdb_func_t func,
- char *usage,
- char *help,
- short minlen,
- kdb_cmdflags_t flags)
+int kdb_register(kdbtab_t *cmd)
{
kdbtab_t *kp;
list_for_each_entry(kp, &kdb_cmds_head, list_node) {
- if (strcmp(kp->cmd_name, cmd) == 0) {
- kdb_printf("Duplicate kdb command registered: "
- "%s, func %px help %s\n", cmd, func, help);
+ if (strcmp(kp->name, cmd->name) == 0) {
+ kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
+ cmd->name, cmd->func, cmd->help);
return 1;
}
}
- kp = kmalloc(sizeof(*kp), GFP_KDB);
- if (!kp) {
- kdb_printf("Could not allocate new kdb_command table\n");
- return 1;
- }
-
- kp->cmd_name = cmd;
- kp->cmd_func = func;
- kp->cmd_usage = usage;
- kp->cmd_help = help;
- kp->cmd_minlen = minlen;
- kp->cmd_flags = flags;
- kp->is_dynamic = true;
-
- list_add_tail(&kp->list_node, &kdb_cmds_head);
-
+ list_add_tail(&cmd->list_node, &kdb_cmds_head);
return 0;
}
-EXPORT_SYMBOL_GPL(kdb_register_flags);
+EXPORT_SYMBOL_GPL(kdb_register);
-/*
+/**
* kdb_register_table() - This function is used to register a kdb command
* table.
* @kp: pointer to kdb command table
@@ -2676,266 +2657,231 @@ void kdb_register_table(kdbtab_t *kp, size_t len)
}
}
-/*
- * kdb_register - Compatibility register function for commands that do
- * not need to specify a repeat state. Equivalent to
- * kdb_register_flags with flags set to 0.
- * Inputs:
- * cmd Command name
- * func Function to execute the command
- * usage A simple usage string showing arguments
- * help A simple help string describing command
- * Returns:
- * zero for success, one if a duplicate command.
+/**
+ * kdb_unregister() - This function is used to unregister a kernel debugger
+ * command. It is generally called when a module which
+ * implements kdb command is unloaded.
+ * @cmd: pointer to kdb command
*/
-int kdb_register(char *cmd,
- kdb_func_t func,
- char *usage,
- char *help,
- short minlen)
+void kdb_unregister(kdbtab_t *cmd)
{
- return kdb_register_flags(cmd, func, usage, help, minlen, 0);
-}
-EXPORT_SYMBOL_GPL(kdb_register);
-
-/*
- * kdb_unregister - This function is used to unregister a kernel
- * debugger command. It is generally called when a module which
- * implements kdb commands is unloaded.
- * Inputs:
- * cmd Command name
- * Returns:
- * zero for success, one command not registered.
- */
-int kdb_unregister(char *cmd)
-{
- kdbtab_t *kp;
-
- /*
- * find the command.
- */
- list_for_each_entry(kp, &kdb_cmds_head, list_node) {
- if (strcmp(kp->cmd_name, cmd) == 0) {
- list_del(&kp->list_node);
- if (kp->is_dynamic)
- kfree(kp);
- return 0;
- }
- }
-
- /* Couldn't find it. */
- return 1;
+ list_del(&cmd->list_node);
}
EXPORT_SYMBOL_GPL(kdb_unregister);
static kdbtab_t maintab[] = {
- { .cmd_name = "md",
- .cmd_func = kdb_md,
- .cmd_usage = "<vaddr>",
- .cmd_help = "Display Memory Contents, also mdWcN, e.g. md8c1",
- .cmd_minlen = 1,
- .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ { .name = "md",
+ .func = kdb_md,
+ .usage = "<vaddr>",
+ .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
+ .minlen = 1,
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "mdr",
- .cmd_func = kdb_md,
- .cmd_usage = "<vaddr> <bytes>",
- .cmd_help = "Display Raw Memory",
- .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ { .name = "mdr",
+ .func = kdb_md,
+ .usage = "<vaddr> <bytes>",
+ .help = "Display Raw Memory",
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "mdp",
- .cmd_func = kdb_md,
- .cmd_usage = "<paddr> <bytes>",
- .cmd_help = "Display Physical Memory",
- .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ { .name = "mdp",
+ .func = kdb_md,
+ .usage = "<paddr> <bytes>",
+ .help = "Display Physical Memory",
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "mds",
- .cmd_func = kdb_md,
- .cmd_usage = "<vaddr>",
- .cmd_help = "Display Memory Symbolically",
- .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ { .name = "mds",
+ .func = kdb_md,
+ .usage = "<vaddr>",
+ .help = "Display Memory Symbolically",
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "mm",
- .cmd_func = kdb_mm,
- .cmd_usage = "<vaddr> <contents>",
- .cmd_help = "Modify Memory Contents",
- .cmd_flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
+ { .name = "mm",
+ .func = kdb_mm,
+ .usage = "<vaddr> <contents>",
+ .help = "Modify Memory Contents",
+ .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
},
- { .cmd_name = "go",
- .cmd_func = kdb_go,
- .cmd_usage = "[<vaddr>]",
- .cmd_help = "Continue Execution",
- .cmd_minlen = 1,
- .cmd_flags = KDB_ENABLE_REG_WRITE |
+ { .name = "go",
+ .func = kdb_go,
+ .usage = "[<vaddr>]",
+ .help = "Continue Execution",
+ .minlen = 1,
+ .flags = KDB_ENABLE_REG_WRITE |
KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
},
- { .cmd_name = "rd",
- .cmd_func = kdb_rd,
- .cmd_usage = "",
- .cmd_help = "Display Registers",
- .cmd_flags = KDB_ENABLE_REG_READ,
+ { .name = "rd",
+ .func = kdb_rd,
+ .usage = "",
+ .help = "Display Registers",
+ .flags = KDB_ENABLE_REG_READ,
},
- { .cmd_name = "rm",
- .cmd_func = kdb_rm,
- .cmd_usage = "<reg> <contents>",
- .cmd_help = "Modify Registers",
- .cmd_flags = KDB_ENABLE_REG_WRITE,
+ { .name = "rm",
+ .func = kdb_rm,
+ .usage = "<reg> <contents>",
+ .help = "Modify Registers",
+ .flags = KDB_ENABLE_REG_WRITE,
},
- { .cmd_name = "ef",
- .cmd_func = kdb_ef,
- .cmd_usage = "<vaddr>",
- .cmd_help = "Display exception frame",
- .cmd_flags = KDB_ENABLE_MEM_READ,
+ { .name = "ef",
+ .func = kdb_ef,
+ .usage = "<vaddr>",
+ .help = "Display exception frame",
+ .flags = KDB_ENABLE_MEM_READ,
},
- { .cmd_name = "bt",
- .cmd_func = kdb_bt,
- .cmd_usage = "[<vaddr>]",
- .cmd_help = "Stack traceback",
- .cmd_minlen = 1,
- .cmd_flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
+ { .name = "bt",
+ .func = kdb_bt,
+ .usage = "[<vaddr>]",
+ .help = "Stack traceback",
+ .minlen = 1,
+ .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
},
- { .cmd_name = "btp",
- .cmd_func = kdb_bt,
- .cmd_usage = "<pid>",
- .cmd_help = "Display stack for process <pid>",
- .cmd_flags = KDB_ENABLE_INSPECT,
+ { .name = "btp",
+ .func = kdb_bt,
+ .usage = "<pid>",
+ .help = "Display stack for process <pid>",
+ .flags = KDB_ENABLE_INSPECT,
},
- { .cmd_name = "bta",
- .cmd_func = kdb_bt,
- .cmd_usage = "[D|R|S|T|C|Z|E|U|I|M|A]",
- .cmd_help = "Backtrace all processes matching state flag",
- .cmd_flags = KDB_ENABLE_INSPECT,
+ { .name = "bta",
+ .func = kdb_bt,
+ .usage = "[D|R|S|T|C|Z|E|U|I|M|A]",
+ .help = "Backtrace all processes matching state flag",
+ .flags = KDB_ENABLE_INSPECT,
},
- { .cmd_name = "btc",
- .cmd_func = kdb_bt,
- .cmd_usage = "",
- .cmd_help = "Backtrace current process on each cpu",
- .cmd_flags = KDB_ENABLE_INSPECT,
+ { .name = "btc",
+ .func = kdb_bt,
+ .usage = "",
+ .help = "Backtrace current process on each cpu",
+ .flags = KDB_ENABLE_INSPECT,
},
- { .cmd_name = "btt",
- .cmd_func = kdb_bt,
- .cmd_usage = "<vaddr>",
- .cmd_help = "Backtrace process given its struct task address",
- .cmd_flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
+ { .name = "btt",
+ .func = kdb_bt,
+ .usage = "<vaddr>",
+ .help = "Backtrace process given its struct task address",
+ .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
},
- { .cmd_name = "env",
- .cmd_func = kdb_env,
- .cmd_usage = "",
- .cmd_help = "Show environment variables",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "env",
+ .func = kdb_env,
+ .usage = "",
+ .help = "Show environment variables",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
- { .cmd_name = "set",
- .cmd_func = kdb_set,
- .cmd_usage = "",
- .cmd_help = "Set environment variables",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "set",
+ .func = kdb_set,
+ .usage = "",
+ .help = "Set environment variables",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
- { .cmd_name = "help",
- .cmd_func = kdb_help,
- .cmd_usage = "",
- .cmd_help = "Display Help Message",
- .cmd_minlen = 1,
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "help",
+ .func = kdb_help,
+ .usage = "",
+ .help = "Display Help Message",
+ .minlen = 1,
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
- { .cmd_name = "?",
- .cmd_func = kdb_help,
- .cmd_usage = "",
- .cmd_help = "Display Help Message",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "?",
+ .func = kdb_help,
+ .usage = "",
+ .help = "Display Help Message",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
- { .cmd_name = "cpu",
- .cmd_func = kdb_cpu,
- .cmd_usage = "<cpunum>",
- .cmd_help = "Switch to new cpu",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
+ { .name = "cpu",
+ .func = kdb_cpu,
+ .usage = "<cpunum>",
+ .help = "Switch to new cpu",
+ .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
},
- { .cmd_name = "kgdb",
- .cmd_func = kdb_kgdb,
- .cmd_usage = "",
- .cmd_help = "Enter kgdb mode",
- .cmd_flags = 0,
+ { .name = "kgdb",
+ .func = kdb_kgdb,
+ .usage = "",
+ .help = "Enter kgdb mode",
+ .flags = 0,
},
- { .cmd_name = "ps",
- .cmd_func = kdb_ps,
- .cmd_usage = "[<flags>|A]",
- .cmd_help = "Display active task list",
- .cmd_flags = KDB_ENABLE_INSPECT,
+ { .name = "ps",
+ .func = kdb_ps,
+ .usage = "[<flags>|A]",
+ .help = "Display active task list",
+ .flags = KDB_ENABLE_INSPECT,
},
- { .cmd_name = "pid",
- .cmd_func = kdb_pid,
- .cmd_usage = "<pidnum>",
- .cmd_help = "Switch to another task",
- .cmd_flags = KDB_ENABLE_INSPECT,
+ { .name = "pid",
+ .func = kdb_pid,
+ .usage = "<pidnum>",
+ .help = "Switch to another task",
+ .flags = KDB_ENABLE_INSPECT,
},
- { .cmd_name = "reboot",
- .cmd_func = kdb_reboot,
- .cmd_usage = "",
- .cmd_help = "Reboot the machine immediately",
- .cmd_flags = KDB_ENABLE_REBOOT,
+ { .name = "reboot",
+ .func = kdb_reboot,
+ .usage = "",
+ .help = "Reboot the machine immediately",
+ .flags = KDB_ENABLE_REBOOT,
},
#if defined(CONFIG_MODULES)
- { .cmd_name = "lsmod",
- .cmd_func = kdb_lsmod,
- .cmd_usage = "",
- .cmd_help = "List loaded kernel modules",
- .cmd_flags = KDB_ENABLE_INSPECT,
+ { .name = "lsmod",
+ .func = kdb_lsmod,
+ .usage = "",
+ .help = "List loaded kernel modules",
+ .flags = KDB_ENABLE_INSPECT,
},
#endif
#if defined(CONFIG_MAGIC_SYSRQ)
- { .cmd_name = "sr",
- .cmd_func = kdb_sr,
- .cmd_usage = "<key>",
- .cmd_help = "Magic SysRq key",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "sr",
+ .func = kdb_sr,
+ .usage = "<key>",
+ .help = "Magic SysRq key",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
#endif
#if defined(CONFIG_PRINTK)
- { .cmd_name = "dmesg",
- .cmd_func = kdb_dmesg,
- .cmd_usage = "[lines]",
- .cmd_help = "Display syslog buffer",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "dmesg",
+ .func = kdb_dmesg,
+ .usage = "[lines]",
+ .help = "Display syslog buffer",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
#endif
- { .cmd_name = "defcmd",
- .cmd_func = kdb_defcmd,
- .cmd_usage = "name \"usage\" \"help\"",
- .cmd_help = "Define a set of commands, down to endefcmd",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "defcmd",
+ .func = kdb_defcmd,
+ .usage = "name \"usage\" \"help\"",
+ .help = "Define a set of commands, down to endefcmd",
+ /*
+ * Macros are always safe because when executed each
+ * internal command re-enters kdb_parse() and is safety
+ * checked individually.
+ */
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
- { .cmd_name = "kill",
- .cmd_func = kdb_kill,
- .cmd_usage = "<-signal> <pid>",
- .cmd_help = "Send a signal to a process",
- .cmd_flags = KDB_ENABLE_SIGNAL,
+ { .name = "kill",
+ .func = kdb_kill,
+ .usage = "<-signal> <pid>",
+ .help = "Send a signal to a process",
+ .flags = KDB_ENABLE_SIGNAL,
},
- { .cmd_name = "summary",
- .cmd_func = kdb_summary,
- .cmd_usage = "",
- .cmd_help = "Summarize the system",
- .cmd_minlen = 4,
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "summary",
+ .func = kdb_summary,
+ .usage = "",
+ .help = "Summarize the system",
+ .minlen = 4,
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
- { .cmd_name = "per_cpu",
- .cmd_func = kdb_per_cpu,
- .cmd_usage = "<sym> [<bytes>] [<cpu>]",
- .cmd_help = "Display per_cpu variables",
- .cmd_minlen = 3,
- .cmd_flags = KDB_ENABLE_MEM_READ,
+ { .name = "per_cpu",
+ .func = kdb_per_cpu,
+ .usage = "<sym> [<bytes>] [<cpu>]",
+ .help = "Display per_cpu variables",
+ .minlen = 3,
+ .flags = KDB_ENABLE_MEM_READ,
},
- { .cmd_name = "grephelp",
- .cmd_func = kdb_grep_help,
- .cmd_usage = "",
- .cmd_help = "Display help on | grep",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ { .name = "grephelp",
+ .func = kdb_grep_help,
+ .usage = "",
+ .help = "Display help on | grep",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
},
};
static kdbtab_t nmicmd = {
- .cmd_name = "disable_nmi",
- .cmd_func = kdb_disable_nmi,
- .cmd_usage = "",
- .cmd_help = "Disable NMI entry to KDB",
- .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
+ .name = "disable_nmi",
+ .func = kdb_disable_nmi,
+ .usage = "",
+ .help = "Disable NMI entry to KDB",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
};
/* Initialize the kdb command table. */
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index 170c69aedebb..629590084a0d 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -109,7 +109,6 @@ extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
long *, char **);
extern int kdbgetsymval(const char *, kdb_symtab_t *);
extern int kdbnearsym(unsigned long, kdb_symtab_t *);
-extern void kdbnearsym_cleanup(void);
extern char *kdb_strdup(const char *str, gfp_t type);
extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
@@ -165,19 +164,6 @@ typedef struct _kdb_bp {
#ifdef CONFIG_KGDB_KDB
extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
-/* The KDB shell command table */
-typedef struct _kdbtab {
- char *cmd_name; /* Command name */
- kdb_func_t cmd_func; /* Function to execute command */
- char *cmd_usage; /* Usage String for this command */
- char *cmd_help; /* Help message for this command */
- short cmd_minlen; /* Minimum legal # command
- * chars required */
- kdb_cmdflags_t cmd_flags; /* Command behaviour flags */
- struct list_head list_node; /* Command list */
- bool is_dynamic; /* Command table allocation type */
-} kdbtab_t;
-
extern void kdb_register_table(kdbtab_t *kp, size_t len);
extern int kdb_bt(int, const char **); /* KDB display back trace */
@@ -233,10 +219,6 @@ extern struct task_struct *kdb_curr_task(int);
#define GFP_KDB (in_dbg_master() ? GFP_ATOMIC : GFP_KERNEL)
-extern void *debug_kmalloc(size_t size, gfp_t flags);
-extern void debug_kfree(void *);
-extern void debug_kusage(void);
-
extern struct task_struct *kdb_current_task;
extern struct pt_regs *kdb_current_regs;
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 9f50d22d68e6..7507d9a8dc6a 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -10,7 +10,6 @@
* 03/02/13 added new 2.5 kallsyms <xavier.bru@bull.net>
*/
-#include <stdarg.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
@@ -52,48 +51,48 @@ int kdbgetsymval(const char *symname, kdb_symtab_t *symtab)
}
EXPORT_SYMBOL(kdbgetsymval);
-static char *kdb_name_table[100]; /* arbitrary size */
-
-/*
- * kdbnearsym - Return the name of the symbol with the nearest address
- * less than 'addr'.
+/**
+ * kdbnearsym() - Return the name of the symbol with the nearest address
+ * less than @addr.
+ * @addr: Address to check for near symbol
+ * @symtab: Structure to receive results
*
- * Parameters:
- * addr Address to check for symbol near
- * symtab Structure to receive results
- * Returns:
- * 0 No sections contain this address, symtab zero filled
- * 1 Address mapped to module/symbol/section, data in symtab
- * Remarks:
- * 2.6 kallsyms has a "feature" where it unpacks the name into a
- * string. If that string is reused before the caller expects it
- * then the caller sees its string change without warning. To
- * avoid cluttering up the main kdb code with lots of kdb_strdup,
- * tests and kfree calls, kdbnearsym maintains an LRU list of the
- * last few unique strings. The list is sized large enough to
- * hold active strings, no kdb caller of kdbnearsym makes more
- * than ~20 later calls before using a saved value.
+ * WARNING: This function may return a pointer to a single statically
+ * allocated buffer (namebuf). kdb's unusual calling context (single
+ * threaded, all other CPUs halted) provides us sufficient locking for
+ * this to be safe. The only constraint imposed by the static buffer is
+ * that the caller must consume any previous reply prior to another call
+ * to lookup a new symbol.
+ *
+ * Note that, strictly speaking, some architectures may re-enter the kdb
+ * trap if the system turns out to be very badly damaged and this breaks
+ * the single-threaded assumption above. In these circumstances successful
+ * continuation and exit from the inner trap is unlikely to work and any
+ * user attempting this receives a prominent warning before being allowed
+ * to progress. In these circumstances we remain memory safe because
+ * namebuf[KSYM_NAME_LEN-1] will never change from '\0' although we do
+ * tolerate the possibility of garbled symbol display from the outer kdb
+ * trap.
+ *
+ * Return:
+ * * 0 - No sections contain this address, symtab zero filled
+ * * 1 - Address mapped to module/symbol/section, data in symtab
*/
int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
{
int ret = 0;
unsigned long symbolsize = 0;
unsigned long offset = 0;
-#define knt1_size 128 /* must be >= kallsyms table size */
- char *knt1 = NULL;
+ static char namebuf[KSYM_NAME_LEN];
kdb_dbg_printf(AR, "addr=0x%lx, symtab=%px\n", addr, symtab);
memset(symtab, 0, sizeof(*symtab));
if (addr < 4096)
goto out;
- knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC);
- if (!knt1) {
- kdb_func_printf("addr=0x%lx cannot kmalloc knt1\n", addr);
- goto out;
- }
+
symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset,
- (char **)(&symtab->mod_name), knt1);
+ (char **)(&symtab->mod_name), namebuf);
if (offset > 8*1024*1024) {
symtab->sym_name = NULL;
addr = offset = symbolsize = 0;
@@ -102,63 +101,14 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
symtab->sym_end = symtab->sym_start + symbolsize;
ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
- if (ret) {
- int i;
- /* Another 2.6 kallsyms "feature". Sometimes the sym_name is
- * set but the buffer passed into kallsyms_lookup is not used,
- * so it contains garbage. The caller has to work out which
- * buffer needs to be saved.
- *
- * What was Rusty smoking when he wrote that code?
- */
- if (symtab->sym_name != knt1) {
- strncpy(knt1, symtab->sym_name, knt1_size);
- knt1[knt1_size-1] = '\0';
- }
- for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
- if (kdb_name_table[i] &&
- strcmp(kdb_name_table[i], knt1) == 0)
- break;
- }
- if (i >= ARRAY_SIZE(kdb_name_table)) {
- debug_kfree(kdb_name_table[0]);
- memmove(kdb_name_table, kdb_name_table+1,
- sizeof(kdb_name_table[0]) *
- (ARRAY_SIZE(kdb_name_table)-1));
- } else {
- debug_kfree(knt1);
- knt1 = kdb_name_table[i];
- memmove(kdb_name_table+i, kdb_name_table+i+1,
- sizeof(kdb_name_table[0]) *
- (ARRAY_SIZE(kdb_name_table)-i-1));
- }
- i = ARRAY_SIZE(kdb_name_table) - 1;
- kdb_name_table[i] = knt1;
- symtab->sym_name = kdb_name_table[i];
- knt1 = NULL;
- }
-
if (symtab->mod_name == NULL)
symtab->mod_name = "kernel";
kdb_dbg_printf(AR, "returns %d symtab->sym_start=0x%lx, symtab->mod_name=%px, symtab->sym_name=%px (%s)\n",
ret, symtab->sym_start, symtab->mod_name, symtab->sym_name, symtab->sym_name);
-
out:
- debug_kfree(knt1);
return ret;
}
-void kdbnearsym_cleanup(void)
-{
- int i;
- for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
- if (kdb_name_table[i]) {
- debug_kfree(kdb_name_table[i]);
- kdb_name_table[i] = NULL;
- }
- }
-}
-
static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1];
/*
@@ -656,230 +606,6 @@ unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
return (mask & kdb_task_state_string(state)) != 0;
}
-/* Last ditch allocator for debugging, so we can still debug even when
- * the GFP_ATOMIC pool has been exhausted. The algorithms are tuned
- * for space usage, not for speed. One smallish memory pool, the free
- * chain is always in ascending address order to allow coalescing,
- * allocations are done in brute force best fit.
- */
-
-struct debug_alloc_header {
- u32 next; /* offset of next header from start of pool */
- u32 size;
- void *caller;
-};
-
-/* The memory returned by this allocator must be aligned, which means
- * so must the header size. Do not assume that sizeof(struct
- * debug_alloc_header) is a multiple of the alignment, explicitly
- * calculate the overhead of this header, including the alignment.
- * The rest of this code must not use sizeof() on any header or
- * pointer to a header.
- */
-#define dah_align 8
-#define dah_overhead ALIGN(sizeof(struct debug_alloc_header), dah_align)
-
-static u64 debug_alloc_pool_aligned[256*1024/dah_align]; /* 256K pool */
-static char *debug_alloc_pool = (char *)debug_alloc_pool_aligned;
-static u32 dah_first, dah_first_call = 1, dah_used, dah_used_max;
-
-/* Locking is awkward. The debug code is called from all contexts,
- * including non maskable interrupts. A normal spinlock is not safe
- * in NMI context. Try to get the debug allocator lock, if it cannot
- * be obtained after a second then give up. If the lock could not be
- * previously obtained on this cpu then only try once.
- *
- * sparse has no annotation for "this function _sometimes_ acquires a
- * lock", so fudge the acquire/release notation.
- */
-static DEFINE_SPINLOCK(dap_lock);
-static int get_dap_lock(void)
- __acquires(dap_lock)
-{
- static int dap_locked = -1;
- int count;
- if (dap_locked == smp_processor_id())
- count = 1;
- else
- count = 1000;
- while (1) {
- if (spin_trylock(&dap_lock)) {
- dap_locked = -1;
- return 1;
- }
- if (!count--)
- break;
- udelay(1000);
- }
- dap_locked = smp_processor_id();
- __acquire(dap_lock);
- return 0;
-}
-
-void *debug_kmalloc(size_t size, gfp_t flags)
-{
- unsigned int rem, h_offset;
- struct debug_alloc_header *best, *bestprev, *prev, *h;
- void *p = NULL;
- if (!get_dap_lock()) {
- __release(dap_lock); /* we never actually got it */
- return NULL;
- }
- h = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
- if (dah_first_call) {
- h->size = sizeof(debug_alloc_pool_aligned) - dah_overhead;
- dah_first_call = 0;
- }
- size = ALIGN(size, dah_align);
- prev = best = bestprev = NULL;
- while (1) {
- if (h->size >= size && (!best || h->size < best->size)) {
- best = h;
- bestprev = prev;
- if (h->size == size)
- break;
- }
- if (!h->next)
- break;
- prev = h;
- h = (struct debug_alloc_header *)(debug_alloc_pool + h->next);
- }
- if (!best)
- goto out;
- rem = best->size - size;
- /* The pool must always contain at least one header */
- if (best->next == 0 && bestprev == NULL && rem < dah_overhead)
- goto out;
- if (rem >= dah_overhead) {
- best->size = size;
- h_offset = ((char *)best - debug_alloc_pool) +
- dah_overhead + best->size;
- h = (struct debug_alloc_header *)(debug_alloc_pool + h_offset);
- h->size = rem - dah_overhead;
- h->next = best->next;
- } else
- h_offset = best->next;
- best->caller = __builtin_return_address(0);
- dah_used += best->size;
- dah_used_max = max(dah_used, dah_used_max);
- if (bestprev)
- bestprev->next = h_offset;
- else
- dah_first = h_offset;
- p = (char *)best + dah_overhead;
- memset(p, POISON_INUSE, best->size - 1);
- *((char *)p + best->size - 1) = POISON_END;
-out:
- spin_unlock(&dap_lock);
- return p;
-}
-
-void debug_kfree(void *p)
-{
- struct debug_alloc_header *h;
- unsigned int h_offset;
- if (!p)
- return;
- if ((char *)p < debug_alloc_pool ||
- (char *)p >= debug_alloc_pool + sizeof(debug_alloc_pool_aligned)) {
- kfree(p);
- return;
- }
- if (!get_dap_lock()) {
- __release(dap_lock); /* we never actually got it */
- return; /* memory leak, cannot be helped */
- }
- h = (struct debug_alloc_header *)((char *)p - dah_overhead);
- memset(p, POISON_FREE, h->size - 1);
- *((char *)p + h->size - 1) = POISON_END;
- h->caller = NULL;
- dah_used -= h->size;
- h_offset = (char *)h - debug_alloc_pool;
- if (h_offset < dah_first) {
- h->next = dah_first;
- dah_first = h_offset;
- } else {
- struct debug_alloc_header *prev;
- unsigned int prev_offset;
- prev = (struct debug_alloc_header *)(debug_alloc_pool +
- dah_first);
- while (1) {
- if (!prev->next || prev->next > h_offset)
- break;
- prev = (struct debug_alloc_header *)
- (debug_alloc_pool + prev->next);
- }
- prev_offset = (char *)prev - debug_alloc_pool;
- if (prev_offset + dah_overhead + prev->size == h_offset) {
- prev->size += dah_overhead + h->size;
- memset(h, POISON_FREE, dah_overhead - 1);
- *((char *)h + dah_overhead - 1) = POISON_END;
- h = prev;
- h_offset = prev_offset;
- } else {
- h->next = prev->next;
- prev->next = h_offset;
- }
- }
- if (h_offset + dah_overhead + h->size == h->next) {
- struct debug_alloc_header *next;
- next = (struct debug_alloc_header *)
- (debug_alloc_pool + h->next);
- h->size += dah_overhead + next->size;
- h->next = next->next;
- memset(next, POISON_FREE, dah_overhead - 1);
- *((char *)next + dah_overhead - 1) = POISON_END;
- }
- spin_unlock(&dap_lock);
-}
-
-void debug_kusage(void)
-{
- struct debug_alloc_header *h_free, *h_used;
-#ifdef CONFIG_IA64
- /* FIXME: using dah for ia64 unwind always results in a memory leak.
- * Fix that memory leak first, then set debug_kusage_one_time = 1 for
- * all architectures.
- */
- static int debug_kusage_one_time;
-#else
- static int debug_kusage_one_time = 1;
-#endif
- if (!get_dap_lock()) {
- __release(dap_lock); /* we never actually got it */
- return;
- }
- h_free = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
- if (dah_first == 0 &&
- (h_free->size == sizeof(debug_alloc_pool_aligned) - dah_overhead ||
- dah_first_call))
- goto out;
- if (!debug_kusage_one_time)
- goto out;
- debug_kusage_one_time = 0;
- kdb_func_printf("debug_kmalloc memory leak dah_first %d\n", dah_first);
- if (dah_first) {
- h_used = (struct debug_alloc_header *)debug_alloc_pool;
- kdb_func_printf("h_used %px size %d\n", h_used, h_used->size);
- }
- do {
- h_used = (struct debug_alloc_header *)
- ((char *)h_free + dah_overhead + h_free->size);
- kdb_func_printf("h_used %px size %d caller %px\n",
- h_used, h_used->size, h_used->caller);
- h_free = (struct debug_alloc_header *)
- (debug_alloc_pool + h_free->next);
- } while (h_free->next);
- h_used = (struct debug_alloc_header *)
- ((char *)h_free + dah_overhead + h_free->size);
- if ((char *)h_used - debug_alloc_pool !=
- sizeof(debug_alloc_pool_aligned))
- kdb_func_printf("h_used %px size %d caller %px\n",
- h_used, h_used->size, h_used->caller);
-out:
- spin_unlock(&dap_lock);
-}
-
/* Maintain a small stack of kdb_flags to allow recursion without disturbing
* the global kdb state.
*/
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 77b405508743..1b02179758cb 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -80,6 +80,19 @@ config SWIOTLB
bool
select NEED_DMA_MAP_STATE
+config DMA_RESTRICTED_POOL
+ bool "DMA Restricted Pool"
+ depends on OF && OF_RESERVED_MEM && SWIOTLB
+ help
+ This enables support for restricted DMA pools which provide a level of
+ DMA memory protection on systems with limited hardware protection
+ capabilities, such as those lacking an IOMMU.
+
+ For more information see
+ <Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt>
+ and <kernel/dma/swiotlb.c>.
+ If unsure, say "n".
+
#
# Should be selected if we can mmap non-coherent mappings to userspace.
# The only thing that is really required is a way to set an uncached bit
@@ -93,6 +106,10 @@ config DMA_COHERENT_POOL
select GENERIC_ALLOCATOR
bool
+config DMA_GLOBAL_POOL
+ select DMA_DECLARE_COHERENT
+ bool
+
config DMA_REMAP
bool
depends on MMU
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 794e76b03b34..25fc85a7aebe 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -20,8 +20,6 @@ struct dma_coherent_mem {
bool use_dev_dma_pfn_offset;
};
-static struct dma_coherent_mem *dma_coherent_default_memory __ro_after_init;
-
static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *dev)
{
if (dev && dev->dma_mem)
@@ -37,51 +35,44 @@ static inline dma_addr_t dma_get_device_base(struct device *dev,
return mem->device_base;
}
-static int dma_init_coherent_memory(phys_addr_t phys_addr,
- dma_addr_t device_addr, size_t size,
- struct dma_coherent_mem **mem)
+static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
+ dma_addr_t device_addr, size_t size, bool use_dma_pfn_offset)
{
- struct dma_coherent_mem *dma_mem = NULL;
- void *mem_base = NULL;
+ struct dma_coherent_mem *dma_mem;
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
- int ret;
+ void *mem_base;
- if (!size) {
- ret = -EINVAL;
- goto out;
- }
+ if (!size)
+ return ERR_PTR(-EINVAL);
mem_base = memremap(phys_addr, size, MEMREMAP_WC);
- if (!mem_base) {
- ret = -EINVAL;
- goto out;
- }
+ if (!mem_base)
+ return ERR_PTR(-EINVAL);
+
dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
- if (!dma_mem) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!dma_mem)
+ goto out_unmap_membase;
dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
- if (!dma_mem->bitmap) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!dma_mem->bitmap)
+ goto out_free_dma_mem;
dma_mem->virt_base = mem_base;
dma_mem->device_base = device_addr;
dma_mem->pfn_base = PFN_DOWN(phys_addr);
dma_mem->size = pages;
+ dma_mem->use_dev_dma_pfn_offset = use_dma_pfn_offset;
spin_lock_init(&dma_mem->spinlock);
- *mem = dma_mem;
- return 0;
+ return dma_mem;
-out:
+out_free_dma_mem:
kfree(dma_mem);
- if (mem_base)
- memunmap(mem_base);
- return ret;
+out_unmap_membase:
+ memunmap(mem_base);
+ pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %zd MiB\n",
+ &phys_addr, size / SZ_1M);
+ return ERR_PTR(-ENOMEM);
}
static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
@@ -130,9 +121,9 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
struct dma_coherent_mem *mem;
int ret;
- ret = dma_init_coherent_memory(phys_addr, device_addr, size, &mem);
- if (ret)
- return ret;
+ mem = dma_init_coherent_memory(phys_addr, device_addr, size, false);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);
ret = dma_assign_coherent_memory(dev, mem);
if (ret)
@@ -198,16 +189,6 @@ int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
return 1;
}
-void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
- dma_addr_t *dma_handle)
-{
- if (!dma_coherent_default_memory)
- return NULL;
-
- return __dma_alloc_from_coherent(dev, dma_coherent_default_memory, size,
- dma_handle);
-}
-
static int __dma_release_from_coherent(struct dma_coherent_mem *mem,
int order, void *vaddr)
{
@@ -243,15 +224,6 @@ int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr)
return __dma_release_from_coherent(mem, order, vaddr);
}
-int dma_release_from_global_coherent(int order, void *vaddr)
-{
- if (!dma_coherent_default_memory)
- return 0;
-
- return __dma_release_from_coherent(dma_coherent_default_memory, order,
- vaddr);
-}
-
static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem,
struct vm_area_struct *vma, void *vaddr, size_t size, int *ret)
{
@@ -297,6 +269,28 @@ int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
return __dma_mmap_from_coherent(mem, vma, vaddr, size, ret);
}
+#ifdef CONFIG_DMA_GLOBAL_POOL
+static struct dma_coherent_mem *dma_coherent_default_memory __ro_after_init;
+
+void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
+ dma_addr_t *dma_handle)
+{
+ if (!dma_coherent_default_memory)
+ return NULL;
+
+ return __dma_alloc_from_coherent(dev, dma_coherent_default_memory, size,
+ dma_handle);
+}
+
+int dma_release_from_global_coherent(int order, void *vaddr)
+{
+ if (!dma_coherent_default_memory)
+ return 0;
+
+ return __dma_release_from_coherent(dma_coherent_default_memory, order,
+ vaddr);
+}
+
int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *vaddr,
size_t size, int *ret)
{
@@ -307,6 +301,19 @@ int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *vaddr,
vaddr, size, ret);
}
+int dma_init_global_coherent(phys_addr_t phys_addr, size_t size)
+{
+ struct dma_coherent_mem *mem;
+
+ mem = dma_init_coherent_memory(phys_addr, phys_addr, size, true);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);
+ dma_coherent_default_memory = mem;
+ pr_info("DMA: default coherent area is set\n");
+ return 0;
+}
+#endif /* CONFIG_DMA_GLOBAL_POOL */
+
/*
* Support for reserved memory regions defined in device tree
*/
@@ -315,25 +322,22 @@ int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *vaddr,
#include <linux/of_fdt.h>
#include <linux/of_reserved_mem.h>
+#ifdef CONFIG_DMA_GLOBAL_POOL
static struct reserved_mem *dma_reserved_default_memory __initdata;
+#endif
static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
{
- struct dma_coherent_mem *mem = rmem->priv;
- int ret;
-
- if (!mem) {
- ret = dma_init_coherent_memory(rmem->base, rmem->base,
- rmem->size, &mem);
- if (ret) {
- pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
- &rmem->base, (unsigned long)rmem->size / SZ_1M);
- return ret;
- }
+ if (!rmem->priv) {
+ struct dma_coherent_mem *mem;
+
+ mem = dma_init_coherent_memory(rmem->base, rmem->base,
+ rmem->size, true);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);
+ rmem->priv = mem;
}
- mem->use_dev_dma_pfn_offset = true;
- rmem->priv = mem;
- dma_assign_coherent_memory(dev, mem);
+ dma_assign_coherent_memory(dev, rmem->priv);
return 0;
}
@@ -361,7 +365,9 @@ static int __init rmem_dma_setup(struct reserved_mem *rmem)
pr_err("Reserved memory: regions without no-map are not yet supported\n");
return -EINVAL;
}
+#endif
+#ifdef CONFIG_DMA_GLOBAL_POOL
if (of_get_flat_dt_prop(node, "linux,dma-default", NULL)) {
WARN(dma_reserved_default_memory,
"Reserved memory: region for default DMA coherent area is redefined\n");
@@ -375,31 +381,16 @@ static int __init rmem_dma_setup(struct reserved_mem *rmem)
return 0;
}
+#ifdef CONFIG_DMA_GLOBAL_POOL
static int __init dma_init_reserved_memory(void)
{
- const struct reserved_mem_ops *ops;
- int ret;
-
if (!dma_reserved_default_memory)
return -ENOMEM;
-
- ops = dma_reserved_default_memory->ops;
-
- /*
- * We rely on rmem_dma_device_init() does not propagate error of
- * dma_assign_coherent_memory() for "NULL" device.
- */
- ret = ops->device_init(dma_reserved_default_memory, NULL);
-
- if (!ret) {
- dma_coherent_default_memory = dma_reserved_default_memory->priv;
- pr_info("DMA: default coherent area is set\n");
- }
-
- return ret;
+ return dma_init_global_coherent(dma_reserved_default_memory->base,
+ dma_reserved_default_memory->size);
}
-
core_initcall(dma_init_reserved_memory);
+#endif /* CONFIG_DMA_GLOBAL_POOL */
RESERVEDMEM_OF_DECLARE(dma, "shared-dma-pool", rmem_dma_setup);
#endif
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index dadae6255d05..6c90c69e5311 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -792,7 +792,7 @@ static int dump_show(struct seq_file *seq, void *v)
}
DEFINE_SHOW_ATTRIBUTE(dump);
-static void dma_debug_fs_init(void)
+static int __init dma_debug_fs_init(void)
{
struct dentry *dentry = debugfs_create_dir("dma-api", NULL);
@@ -805,7 +805,10 @@ static void dma_debug_fs_init(void)
debugfs_create_u32("nr_total_entries", 0444, dentry, &nr_total_entries);
debugfs_create_file("driver_filter", 0644, dentry, NULL, &filter_fops);
debugfs_create_file("dump", 0444, dentry, NULL, &dump_fops);
+
+ return 0;
}
+core_initcall_sync(dma_debug_fs_init);
static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
{
@@ -890,8 +893,6 @@ static int dma_debug_init(void)
spin_lock_init(&dma_entry_hash[i].lock);
}
- dma_debug_fs_init();
-
nr_pages = DIV_ROUND_UP(nr_prealloc_entries, DMA_DEBUG_DYNAMIC_ENTRIES);
for (i = 0; i < nr_pages; ++i)
dma_debug_create_entries(GFP_KERNEL);
@@ -1064,20 +1065,10 @@ static void check_for_stack(struct device *dev,
}
}
-static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
-{
- unsigned long a1 = (unsigned long)addr;
- unsigned long b1 = a1 + len;
- unsigned long a2 = (unsigned long)start;
- unsigned long b2 = (unsigned long)end;
-
- return !(b1 <= a2 || a1 >= b2);
-}
-
static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
{
- if (overlap(addr, len, _stext, _etext) ||
- overlap(addr, len, __start_rodata, __end_rodata))
+ if (memory_intersects(_stext, _etext, addr, len) ||
+ memory_intersects(__start_rodata, __end_rodata, addr, len))
err_printk(dev, NULL, "device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
}
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index f737e3347059..4c6c5e0635e3 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -75,6 +75,15 @@ static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
}
+static void __dma_direct_free_pages(struct device *dev, struct page *page,
+ size_t size)
+{
+ if (IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL) &&
+ swiotlb_free(dev, page, size))
+ return;
+ dma_free_contiguous(dev, page, size);
+}
+
static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
gfp_t gfp)
{
@@ -86,6 +95,16 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
&phys_limit);
+ if (IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL) &&
+ is_swiotlb_for_alloc(dev)) {
+ page = swiotlb_alloc(dev, size);
+ if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
+ __dma_direct_free_pages(dev, page, size);
+ return NULL;
+ }
+ return page;
+ }
+
page = dma_alloc_contiguous(dev, size, gfp);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_free_contiguous(dev, page, size);
@@ -142,7 +161,7 @@ void *dma_direct_alloc(struct device *dev, size_t size,
gfp |= __GFP_NOWARN;
if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) &&
- !force_dma_unencrypted(dev)) {
+ !force_dma_unencrypted(dev) && !is_swiotlb_for_alloc(dev)) {
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
if (!page)
return NULL;
@@ -156,17 +175,28 @@ void *dma_direct_alloc(struct device *dev, size_t size,
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
- !dev_is_dma_coherent(dev))
+ !IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) &&
+ !dev_is_dma_coherent(dev) &&
+ !is_swiotlb_for_alloc(dev))
return arch_dma_alloc(dev, size, dma_handle, gfp, attrs);
+ if (IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) &&
+ !dev_is_dma_coherent(dev))
+ return dma_alloc_from_global_coherent(dev, size, dma_handle);
+
/*
* Remapping or decrypting memory may block. If either is required and
* we can't block, allocate the memory from the atomic pools.
+ * If restricted DMA (i.e., is_swiotlb_for_alloc) is required, one must
+ * set up another device coherent pool by shared-dma-pool and use
+ * dma_alloc_from_dev_coherent instead.
*/
if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) &&
!gfpflags_allow_blocking(gfp) &&
(force_dma_unencrypted(dev) ||
- (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && !dev_is_dma_coherent(dev))))
+ (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
+ !dev_is_dma_coherent(dev))) &&
+ !is_swiotlb_for_alloc(dev))
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
/* we always manually zero the memory once we are done */
@@ -237,7 +267,7 @@ out_encrypt_pages:
return NULL;
}
out_free_pages:
- dma_free_contiguous(dev, page, size);
+ __dma_direct_free_pages(dev, page, size);
return NULL;
}
@@ -247,7 +277,7 @@ void dma_direct_free(struct device *dev, size_t size,
unsigned int page_order = get_order(size);
if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) &&
- !force_dma_unencrypted(dev)) {
+ !force_dma_unencrypted(dev) && !is_swiotlb_for_alloc(dev)) {
/* cpu_addr is a struct page cookie, not a kernel address */
dma_free_contiguous(dev, cpu_addr, size);
return;
@@ -255,11 +285,20 @@ void dma_direct_free(struct device *dev, size_t size,
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
- !dev_is_dma_coherent(dev)) {
+ !IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) &&
+ !dev_is_dma_coherent(dev) &&
+ !is_swiotlb_for_alloc(dev)) {
arch_dma_free(dev, size, cpu_addr, dma_addr, attrs);
return;
}
+ if (IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) &&
+ !dev_is_dma_coherent(dev)) {
+ if (!dma_release_from_global_coherent(page_order, cpu_addr))
+ WARN_ON_ONCE(1);
+ return;
+ }
+
/* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */
if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) &&
dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size)))
@@ -273,7 +312,7 @@ void dma_direct_free(struct device *dev, size_t size,
else if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED))
arch_dma_clear_uncached(cpu_addr, size);
- dma_free_contiguous(dev, dma_direct_to_page(dev, dma_addr), size);
+ __dma_direct_free_pages(dev, dma_direct_to_page(dev, dma_addr), size);
}
struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
@@ -283,7 +322,8 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
void *ret;
if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) &&
- force_dma_unencrypted(dev) && !gfpflags_allow_blocking(gfp))
+ force_dma_unencrypted(dev) && !gfpflags_allow_blocking(gfp) &&
+ !is_swiotlb_for_alloc(dev))
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
page = __dma_direct_alloc_pages(dev, size, gfp);
@@ -310,7 +350,7 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
*dma_handle = phys_to_dma_direct(dev, page_to_phys(page));
return page;
out_free_pages:
- dma_free_contiguous(dev, page, size);
+ __dma_direct_free_pages(dev, page, size);
return NULL;
}
@@ -329,7 +369,7 @@ void dma_direct_free_pages(struct device *dev, size_t size,
if (force_dma_unencrypted(dev))
set_memory_encrypted((unsigned long)vaddr, 1 << page_order);
- dma_free_contiguous(dev, page, size);
+ __dma_direct_free_pages(dev, page, size);
}
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
@@ -343,7 +383,7 @@ void dma_direct_sync_sg_for_device(struct device *dev,
for_each_sg(sgl, sg, nents, i) {
phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg));
- if (unlikely(is_swiotlb_buffer(paddr)))
+ if (unlikely(is_swiotlb_buffer(dev, paddr)))
swiotlb_sync_single_for_device(dev, paddr, sg->length,
dir);
@@ -369,7 +409,7 @@ void dma_direct_sync_sg_for_cpu(struct device *dev,
if (!dev_is_dma_coherent(dev))
arch_sync_dma_for_cpu(paddr, sg->length, dir);
- if (unlikely(is_swiotlb_buffer(paddr)))
+ if (unlikely(is_swiotlb_buffer(dev, paddr)))
swiotlb_sync_single_for_cpu(dev, paddr, sg->length,
dir);
@@ -411,7 +451,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
out_unmap:
dma_direct_unmap_sg(dev, sgl, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);
- return 0;
+ return -EIO;
}
dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
@@ -462,6 +502,8 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
+ if (dma_mmap_from_global_coherent(vma, cpu_addr, size, &ret))
+ return ret;
if (vma->vm_pgoff >= count || user_count > count - vma->vm_pgoff)
return -ENXIO;
@@ -495,8 +537,8 @@ int dma_direct_supported(struct device *dev, u64 mask)
size_t dma_direct_max_mapping_size(struct device *dev)
{
/* If SWIOTLB is active, use its maximum mapping size */
- if (is_swiotlb_active() &&
- (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE))
+ if (is_swiotlb_active(dev) &&
+ (dma_addressing_limited(dev) || is_swiotlb_force_bounce(dev)))
return swiotlb_max_mapping_size(dev);
return SIZE_MAX;
}
@@ -504,7 +546,7 @@ size_t dma_direct_max_mapping_size(struct device *dev)
bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr)
{
return !dev_is_dma_coherent(dev) ||
- is_swiotlb_buffer(dma_to_phys(dev, dma_addr));
+ is_swiotlb_buffer(dev, dma_to_phys(dev, dma_addr));
}
/**
diff --git a/kernel/dma/direct.h b/kernel/dma/direct.h
index 50afc05b6f1d..4632b0f4f72e 100644
--- a/kernel/dma/direct.h
+++ b/kernel/dma/direct.h
@@ -56,7 +56,7 @@ static inline void dma_direct_sync_single_for_device(struct device *dev,
{
phys_addr_t paddr = dma_to_phys(dev, addr);
- if (unlikely(is_swiotlb_buffer(paddr)))
+ if (unlikely(is_swiotlb_buffer(dev, paddr)))
swiotlb_sync_single_for_device(dev, paddr, size, dir);
if (!dev_is_dma_coherent(dev))
@@ -73,7 +73,7 @@ static inline void dma_direct_sync_single_for_cpu(struct device *dev,
arch_sync_dma_for_cpu_all();
}
- if (unlikely(is_swiotlb_buffer(paddr)))
+ if (unlikely(is_swiotlb_buffer(dev, paddr)))
swiotlb_sync_single_for_cpu(dev, paddr, size, dir);
if (dir == DMA_FROM_DEVICE)
@@ -87,7 +87,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
phys_addr_t phys = page_to_phys(page) + offset;
dma_addr_t dma_addr = phys_to_dma(dev, phys);
- if (unlikely(swiotlb_force == SWIOTLB_FORCE))
+ if (is_swiotlb_force_bounce(dev))
return swiotlb_map(dev, phys, size, dir, attrs);
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
@@ -113,7 +113,7 @@ static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_direct_sync_single_for_cpu(dev, addr, size, dir);
- if (unlikely(is_swiotlb_buffer(phys)))
+ if (unlikely(is_swiotlb_buffer(dev, phys)))
swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs);
}
#endif /* _KERNEL_DMA_DIRECT_H */
diff --git a/kernel/dma/dummy.c b/kernel/dma/dummy.c
index eacd4c5b10bf..b492d59ac77e 100644
--- a/kernel/dma/dummy.c
+++ b/kernel/dma/dummy.c
@@ -22,7 +22,7 @@ static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
- return 0;
+ return -EINVAL;
}
static int dma_dummy_supported(struct device *hwdev, u64 mask)
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 2b06a809d0b9..7ee5284bff58 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -177,12 +177,8 @@ void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size,
}
EXPORT_SYMBOL(dma_unmap_page_attrs);
-/*
- * dma_maps_sg_attrs returns 0 on error and > 0 on success.
- * It should never return a value < 0.
- */
-int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir, unsigned long attrs)
+static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
int ents;
@@ -197,13 +193,81 @@ int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
ents = dma_direct_map_sg(dev, sg, nents, dir, attrs);
else
ents = ops->map_sg(dev, sg, nents, dir, attrs);
- BUG_ON(ents < 0);
- debug_dma_map_sg(dev, sg, nents, ents, dir);
+
+ if (ents > 0)
+ debug_dma_map_sg(dev, sg, nents, ents, dir);
+ else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&
+ ents != -EIO))
+ return -EIO;
return ents;
}
+
+/**
+ * dma_map_sg_attrs - Map the given buffer for DMA
+ * @dev: The device for which to perform the DMA operation
+ * @sg: The sg_table object describing the buffer
+ * @dir: DMA direction
+ * @attrs: Optional DMA attributes for the map operation
+ *
+ * Maps a buffer described by a scatterlist passed in the sg argument with
+ * nents segments for the @dir DMA operation by the @dev device.
+ *
+ * Returns the number of mapped entries (which can be less than nents)
+ * on success. Zero is returned for any error.
+ *
+ * dma_unmap_sg_attrs() should be used to unmap the buffer with the
+ * original sg and original nents (not the value returned by this funciton).
+ */
+unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir, unsigned long attrs)
+{
+ int ret;
+
+ ret = __dma_map_sg_attrs(dev, sg, nents, dir, attrs);
+ if (ret < 0)
+ return 0;
+ return ret;
+}
EXPORT_SYMBOL(dma_map_sg_attrs);
+/**
+ * dma_map_sgtable - Map the given buffer for DMA
+ * @dev: The device for which to perform the DMA operation
+ * @sgt: The sg_table object describing the buffer
+ * @dir: DMA direction
+ * @attrs: Optional DMA attributes for the map operation
+ *
+ * Maps a buffer described by a scatterlist stored in the given sg_table
+ * object for the @dir DMA operation by the @dev device. After success, the
+ * ownership for the buffer is transferred to the DMA domain. One has to
+ * call dma_sync_sgtable_for_cpu() or dma_unmap_sgtable() to move the
+ * ownership of the buffer back to the CPU domain before touching the
+ * buffer by the CPU.
+ *
+ * Returns 0 on success or a negative error code on error. The following
+ * error codes are supported with the given meaning:
+ *
+ * -EINVAL - An invalid argument, unaligned access or other error
+ * in usage. Will not succeed if retried.
+ * -ENOMEM - Insufficient resources (like memory or IOVA space) to
+ * complete the mapping. Should succeed if retried later.
+ * -EIO - Legacy error code with an unknown meaning. eg. this is
+ * returned if a lower level call returned DMA_MAPPING_ERROR.
+ */
+int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
+ enum dma_data_direction dir, unsigned long attrs)
+{
+ int nents;
+
+ nents = __dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
+ if (nents < 0)
+ return nents;
+ sgt->nents = nents;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dma_map_sgtable);
+
void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
unsigned long attrs)
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index e50df8d8f87e..87c40517e822 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -39,6 +39,13 @@
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#endif
+#ifdef CONFIG_DMA_RESTRICTED_POOL
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/slab.h>
+#endif
#include <asm/io.h>
#include <asm/dma.h>
@@ -63,7 +70,7 @@
enum swiotlb_force swiotlb_force;
-struct io_tlb_mem *io_tlb_default_mem;
+struct io_tlb_mem io_tlb_default_mem;
/*
* Max segment that we can provide which (if pages are contingous) will
@@ -94,7 +101,7 @@ early_param("swiotlb", setup_io_tlb_npages);
unsigned int swiotlb_max_segment(void)
{
- return io_tlb_default_mem ? max_segment : 0;
+ return io_tlb_default_mem.nslabs ? max_segment : 0;
}
EXPORT_SYMBOL_GPL(swiotlb_max_segment);
@@ -127,9 +134,9 @@ void __init swiotlb_adjust_size(unsigned long size)
void swiotlb_print_info(void)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
- if (!mem) {
+ if (!mem->nslabs) {
pr_warn("No low mem\n");
return;
}
@@ -156,11 +163,11 @@ static inline unsigned long nr_slots(u64 val)
*/
void __init swiotlb_update_mem_attributes(void)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
void *vaddr;
unsigned long bytes;
- if (!mem || mem->late_alloc)
+ if (!mem->nslabs || mem->late_alloc)
return;
vaddr = phys_to_virt(mem->start);
bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
@@ -168,36 +175,50 @@ void __init swiotlb_update_mem_attributes(void)
memset(vaddr, 0, bytes);
}
-int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
+static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
+ unsigned long nslabs, bool late_alloc)
{
+ void *vaddr = phys_to_virt(start);
unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
- struct io_tlb_mem *mem;
- size_t alloc_size;
-
- if (swiotlb_force == SWIOTLB_NO_FORCE)
- return 0;
-
- /* protect against double initialization */
- if (WARN_ON_ONCE(io_tlb_default_mem))
- return -ENOMEM;
- alloc_size = PAGE_ALIGN(struct_size(mem, slots, nslabs));
- mem = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!mem)
- panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
- __func__, alloc_size, PAGE_SIZE);
mem->nslabs = nslabs;
- mem->start = __pa(tlb);
+ mem->start = start;
mem->end = mem->start + bytes;
mem->index = 0;
+ mem->late_alloc = late_alloc;
+
+ if (swiotlb_force == SWIOTLB_FORCE)
+ mem->force_bounce = true;
+
spin_lock_init(&mem->lock);
for (i = 0; i < mem->nslabs; i++) {
mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
mem->slots[i].alloc_size = 0;
}
+ memset(vaddr, 0, bytes);
+}
+
+int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
+{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ size_t alloc_size;
+
+ if (swiotlb_force == SWIOTLB_NO_FORCE)
+ return 0;
+
+ /* protect against double initialization */
+ if (WARN_ON_ONCE(mem->nslabs))
+ return -ENOMEM;
+
+ alloc_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), nslabs));
+ mem->slots = memblock_alloc(alloc_size, PAGE_SIZE);
+ if (!mem->slots)
+ panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
+ __func__, alloc_size, PAGE_SIZE);
+
+ swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
- io_tlb_default_mem = mem;
if (verbose)
swiotlb_print_info();
swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
@@ -282,37 +303,24 @@ swiotlb_late_init_with_default_size(size_t default_size)
int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
- unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
- struct io_tlb_mem *mem;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ unsigned long bytes = nslabs << IO_TLB_SHIFT;
if (swiotlb_force == SWIOTLB_NO_FORCE)
return 0;
/* protect against double initialization */
- if (WARN_ON_ONCE(io_tlb_default_mem))
+ if (WARN_ON_ONCE(mem->nslabs))
return -ENOMEM;
- mem = (void *)__get_free_pages(GFP_KERNEL,
- get_order(struct_size(mem, slots, nslabs)));
- if (!mem)
+ mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(array_size(sizeof(*mem->slots), nslabs)));
+ if (!mem->slots)
return -ENOMEM;
- mem->nslabs = nslabs;
- mem->start = virt_to_phys(tlb);
- mem->end = mem->start + bytes;
- mem->index = 0;
- mem->late_alloc = 1;
- spin_lock_init(&mem->lock);
- for (i = 0; i < mem->nslabs; i++) {
- mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
- mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
- mem->slots[i].alloc_size = 0;
- }
-
set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
- memset(tlb, 0, bytes);
+ swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
- io_tlb_default_mem = mem;
swiotlb_print_info();
swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
@@ -320,18 +328,28 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
void __init swiotlb_exit(void)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
- size_t size;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ unsigned long tbl_vaddr;
+ size_t tbl_size, slots_size;
- if (!mem)
+ if (!mem->nslabs)
return;
- size = struct_size(mem, slots, mem->nslabs);
- if (mem->late_alloc)
- free_pages((unsigned long)mem, get_order(size));
- else
- memblock_free_late(__pa(mem), PAGE_ALIGN(size));
- io_tlb_default_mem = NULL;
+ pr_info("tearing down default memory pool\n");
+ tbl_vaddr = (unsigned long)phys_to_virt(mem->start);
+ tbl_size = PAGE_ALIGN(mem->end - mem->start);
+ slots_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), mem->nslabs));
+
+ set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT);
+ if (mem->late_alloc) {
+ free_pages(tbl_vaddr, get_order(tbl_size));
+ free_pages((unsigned long)mem->slots, get_order(slots_size));
+ } else {
+ memblock_free_late(mem->start, tbl_size);
+ memblock_free_late(__pa(mem->slots), slots_size);
+ }
+
+ memset(mem, 0, sizeof(*mem));
}
/*
@@ -348,19 +366,33 @@ static unsigned int swiotlb_align_offset(struct device *dev, u64 addr)
static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size,
enum dma_data_direction dir)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
phys_addr_t orig_addr = mem->slots[index].orig_addr;
size_t alloc_size = mem->slots[index].alloc_size;
unsigned long pfn = PFN_DOWN(orig_addr);
unsigned char *vaddr = phys_to_virt(tlb_addr);
- unsigned int tlb_offset;
+ unsigned int tlb_offset, orig_addr_offset;
if (orig_addr == INVALID_PHYS_ADDR)
return;
- tlb_offset = (tlb_addr & (IO_TLB_SIZE - 1)) -
- swiotlb_align_offset(dev, orig_addr);
+ tlb_offset = tlb_addr & (IO_TLB_SIZE - 1);
+ orig_addr_offset = swiotlb_align_offset(dev, orig_addr);
+ if (tlb_offset < orig_addr_offset) {
+ dev_WARN_ONCE(dev, 1,
+ "Access before mapping start detected. orig offset %u, requested offset %u.\n",
+ orig_addr_offset, tlb_offset);
+ return;
+ }
+
+ tlb_offset -= orig_addr_offset;
+ if (tlb_offset > alloc_size) {
+ dev_WARN_ONCE(dev, 1,
+ "Buffer overflow detected. Allocation size: %zu. Mapping size: %zu+%u.\n",
+ alloc_size, size, tlb_offset);
+ return;
+ }
orig_addr += tlb_offset;
alloc_size -= tlb_offset;
@@ -426,10 +458,10 @@ static unsigned int wrap_index(struct io_tlb_mem *mem, unsigned int index)
* Find a suitable number of IO TLB entries size that will fit this request and
* allocate a buffer from that IO TLB pool.
*/
-static int find_slots(struct device *dev, phys_addr_t orig_addr,
- size_t alloc_size)
+static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
+ size_t alloc_size)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
unsigned long boundary_mask = dma_get_seg_boundary(dev);
dma_addr_t tbl_dma_addr =
phys_to_dma_unencrypted(dev, mem->start) & boundary_mask;
@@ -438,6 +470,7 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr,
dma_get_min_align_mask(dev) & ~(IO_TLB_SIZE - 1);
unsigned int nslots = nr_slots(alloc_size), stride;
unsigned int index, wrap, count = 0, i;
+ unsigned int offset = swiotlb_align_offset(dev, orig_addr);
unsigned long flags;
BUG_ON(!nslots);
@@ -457,8 +490,9 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr,
index = wrap = wrap_index(mem, ALIGN(mem->index, stride));
do {
- if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) !=
- (orig_addr & iotlb_align_mask)) {
+ if (orig_addr &&
+ (slot_addr(tbl_dma_addr, index) & iotlb_align_mask) !=
+ (orig_addr & iotlb_align_mask)) {
index = wrap_index(mem, index + 1);
continue;
}
@@ -482,8 +516,11 @@ not_found:
return -1;
found:
- for (i = index; i < index + nslots; i++)
+ for (i = index; i < index + nslots; i++) {
mem->slots[i].list = 0;
+ mem->slots[i].alloc_size =
+ alloc_size - (offset + ((i - index) << IO_TLB_SHIFT));
+ }
for (i = index - 1;
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
mem->slots[i].list; i--)
@@ -506,7 +543,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
size_t mapping_size, size_t alloc_size,
enum dma_data_direction dir, unsigned long attrs)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
unsigned int i;
int index;
@@ -524,7 +561,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
return (phys_addr_t)DMA_MAPPING_ERROR;
}
- index = find_slots(dev, orig_addr, alloc_size + offset);
+ index = swiotlb_find_slots(dev, orig_addr, alloc_size + offset);
if (index == -1) {
if (!(attrs & DMA_ATTR_NO_WARN))
dev_warn_ratelimited(dev,
@@ -538,11 +575,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
* This is needed when we sync the memory. Then we sync the buffer if
* needed.
*/
- for (i = 0; i < nr_slots(alloc_size + offset); i++) {
+ for (i = 0; i < nr_slots(alloc_size + offset); i++)
mem->slots[index + i].orig_addr = slot_addr(orig_addr, i);
- mem->slots[index + i].alloc_size =
- alloc_size - (i << IO_TLB_SHIFT);
- }
tlb_addr = slot_addr(mem->start, index) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
@@ -550,28 +584,16 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
return tlb_addr;
}
-/*
- * tlb_addr is the physical address of the bounce buffer to unmap.
- */
-void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
- size_t mapping_size, enum dma_data_direction dir,
- unsigned long attrs)
+static void swiotlb_release_slots(struct device *dev, phys_addr_t tlb_addr)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
unsigned long flags;
- unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr);
+ unsigned int offset = swiotlb_align_offset(dev, tlb_addr);
int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
int nslots = nr_slots(mem->slots[index].alloc_size + offset);
int count, i;
/*
- * First, sync the memory before unmapping the entry
- */
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
- (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(hwdev, tlb_addr, mapping_size, DMA_FROM_DEVICE);
-
- /*
* Return the buffer to the free list by setting the corresponding
* entries to indicate the number of contiguous entries available.
* While returning the entries to the free list, we merge the entries
@@ -605,6 +627,23 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
spin_unlock_irqrestore(&mem->lock, flags);
}
+/*
+ * tlb_addr is the physical address of the bounce buffer to unmap.
+ */
+void swiotlb_tbl_unmap_single(struct device *dev, phys_addr_t tlb_addr,
+ size_t mapping_size, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ /*
+ * First, sync the memory before unmapping the entry
+ */
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
+ (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
+ swiotlb_bounce(dev, tlb_addr, mapping_size, DMA_FROM_DEVICE);
+
+ swiotlb_release_slots(dev, tlb_addr);
+}
+
void swiotlb_sync_single_for_device(struct device *dev, phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir)
{
@@ -662,26 +701,155 @@ size_t swiotlb_max_mapping_size(struct device *dev)
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE;
}
-bool is_swiotlb_active(void)
+bool is_swiotlb_active(struct device *dev)
{
- return io_tlb_default_mem != NULL;
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+
+ return mem && mem->nslabs;
}
EXPORT_SYMBOL_GPL(is_swiotlb_active);
#ifdef CONFIG_DEBUG_FS
+static struct dentry *debugfs_dir;
-static int __init swiotlb_create_debugfs(void)
+static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem)
{
- struct io_tlb_mem *mem = io_tlb_default_mem;
-
- if (!mem)
- return 0;
- mem->debugfs = debugfs_create_dir("swiotlb", NULL);
debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &mem->used);
+}
+
+static int __init swiotlb_create_default_debugfs(void)
+{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+
+ debugfs_dir = debugfs_create_dir("swiotlb", NULL);
+ if (mem->nslabs) {
+ mem->debugfs = debugfs_dir;
+ swiotlb_create_debugfs_files(mem);
+ }
return 0;
}
-late_initcall(swiotlb_create_debugfs);
+late_initcall(swiotlb_create_default_debugfs);
+
+#endif
+#ifdef CONFIG_DMA_RESTRICTED_POOL
+
+#ifdef CONFIG_DEBUG_FS
+static void rmem_swiotlb_debugfs_init(struct reserved_mem *rmem)
+{
+ struct io_tlb_mem *mem = rmem->priv;
+
+ mem->debugfs = debugfs_create_dir(rmem->name, debugfs_dir);
+ swiotlb_create_debugfs_files(mem);
+}
+#else
+static void rmem_swiotlb_debugfs_init(struct reserved_mem *rmem)
+{
+}
#endif
+
+struct page *swiotlb_alloc(struct device *dev, size_t size)
+{
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+ phys_addr_t tlb_addr;
+ int index;
+
+ if (!mem)
+ return NULL;
+
+ index = swiotlb_find_slots(dev, 0, size);
+ if (index == -1)
+ return NULL;
+
+ tlb_addr = slot_addr(mem->start, index);
+
+ return pfn_to_page(PFN_DOWN(tlb_addr));
+}
+
+bool swiotlb_free(struct device *dev, struct page *page, size_t size)
+{
+ phys_addr_t tlb_addr = page_to_phys(page);
+
+ if (!is_swiotlb_buffer(dev, tlb_addr))
+ return false;
+
+ swiotlb_release_slots(dev, tlb_addr);
+
+ return true;
+}
+
+static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
+ struct device *dev)
+{
+ struct io_tlb_mem *mem = rmem->priv;
+ unsigned long nslabs = rmem->size >> IO_TLB_SHIFT;
+
+ /*
+ * Since multiple devices can share the same pool, the private data,
+ * io_tlb_mem struct, will be initialized by the first device attached
+ * to it.
+ */
+ if (!mem) {
+ mem = kzalloc(sizeof(*mem), GFP_KERNEL);
+ if (!mem)
+ return -ENOMEM;
+
+ mem->slots = kzalloc(array_size(sizeof(*mem->slots), nslabs),
+ GFP_KERNEL);
+ if (!mem->slots) {
+ kfree(mem);
+ return -ENOMEM;
+ }
+
+ set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
+ rmem->size >> PAGE_SHIFT);
+ swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, false);
+ mem->force_bounce = true;
+ mem->for_alloc = true;
+
+ rmem->priv = mem;
+
+ rmem_swiotlb_debugfs_init(rmem);
+ }
+
+ dev->dma_io_tlb_mem = mem;
+
+ return 0;
+}
+
+static void rmem_swiotlb_device_release(struct reserved_mem *rmem,
+ struct device *dev)
+{
+ dev->dma_io_tlb_mem = &io_tlb_default_mem;
+}
+
+static const struct reserved_mem_ops rmem_swiotlb_ops = {
+ .device_init = rmem_swiotlb_device_init,
+ .device_release = rmem_swiotlb_device_release,
+};
+
+static int __init rmem_swiotlb_setup(struct reserved_mem *rmem)
+{
+ unsigned long node = rmem->fdt_node;
+
+ if (of_get_flat_dt_prop(node, "reusable", NULL) ||
+ of_get_flat_dt_prop(node, "linux,cma-default", NULL) ||
+ of_get_flat_dt_prop(node, "linux,dma-default", NULL) ||
+ of_get_flat_dt_prop(node, "no-map", NULL))
+ return -EINVAL;
+
+ if (PageHighMem(pfn_to_page(PHYS_PFN(rmem->base)))) {
+ pr_err("Restricted DMA pool must be accessible within the linear mapping.");
+ return -EINVAL;
+ }
+
+ rmem->ops = &rmem_swiotlb_ops;
+ pr_info("Reserved memory: created restricted DMA pool at %pa, size %ld MiB\n",
+ &rmem->base, (unsigned long)rmem->size / SZ_1M);
+ return 0;
+}
+
+RESERVEDMEM_OF_DECLARE(dma, "restricted-dma-pool", rmem_swiotlb_setup);
+#endif /* CONFIG_DMA_RESTRICTED_POOL */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 011cc5069b7b..744e8726c5b2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8320,8 +8320,6 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
else
flags = MAP_PRIVATE;
- if (vma->vm_flags & VM_DENYWRITE)
- flags |= MAP_DENYWRITE;
if (vma->vm_flags & VM_LOCKED)
flags |= MAP_LOCKED;
if (is_vm_hugetlb_page(vma))
diff --git a/kernel/fork.c b/kernel/fork.c
index 695d1343a254..38681ad44c76 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -471,6 +471,20 @@ void free_task(struct task_struct *tsk)
}
EXPORT_SYMBOL(free_task);
+static void dup_mm_exe_file(struct mm_struct *mm, struct mm_struct *oldmm)
+{
+ struct file *exe_file;
+
+ exe_file = get_mm_exe_file(oldmm);
+ RCU_INIT_POINTER(mm->exe_file, exe_file);
+ /*
+ * We depend on the oldmm having properly denied write access to the
+ * exe_file already.
+ */
+ if (exe_file && deny_write_access(exe_file))
+ pr_warn_once("deny_write_access() failed in %s\n", __func__);
+}
+
#ifdef CONFIG_MMU
static __latent_entropy int dup_mmap(struct mm_struct *mm,
struct mm_struct *oldmm)
@@ -494,7 +508,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
mmap_write_lock_nested(mm, SINGLE_DEPTH_NESTING);
/* No ordering required: file already has been exposed. */
- RCU_INIT_POINTER(mm->exe_file, get_mm_exe_file(oldmm));
+ dup_mm_exe_file(mm, oldmm);
mm->total_vm = oldmm->total_vm;
mm->data_vm = oldmm->data_vm;
@@ -557,12 +571,9 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
tmp->vm_flags &= ~(VM_LOCKED | VM_LOCKONFAULT);
file = tmp->vm_file;
if (file) {
- struct inode *inode = file_inode(file);
struct address_space *mapping = file->f_mapping;
get_file(file);
- if (tmp->vm_flags & VM_DENYWRITE)
- put_write_access(inode);
i_mmap_lock_write(mapping);
if (tmp->vm_flags & VM_SHARED)
mapping_allow_writable(mapping);
@@ -640,7 +651,7 @@ static inline void mm_free_pgd(struct mm_struct *mm)
static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
mmap_write_lock(oldmm);
- RCU_INIT_POINTER(mm->exe_file, get_mm_exe_file(oldmm));
+ dup_mm_exe_file(mm, oldmm);
mmap_write_unlock(oldmm);
return 0;
}
@@ -1052,6 +1063,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
mm->pmd_huge_pte = NULL;
#endif
mm_init_uprobes_state(mm);
+ hugetlb_count_init(mm);
if (current->mm) {
mm->flags = current->mm->flags & MMF_INIT_MASK;
@@ -1150,11 +1162,11 @@ void mmput_async(struct mm_struct *mm)
*
* Main users are mmput() and sys_execve(). Callers prevent concurrent
* invocations: in mmput() nobody alive left, in execve task is single
- * threaded. sys_prctl(PR_SET_MM_MAP/EXE_FILE) also needs to set the
- * mm->exe_file, but does so without using set_mm_exe_file() in order
- * to avoid the need for any locks.
+ * threaded.
+ *
+ * Can only fail if new_exe_file != NULL.
*/
-void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
+int set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
{
struct file *old_exe_file;
@@ -1165,11 +1177,73 @@ void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
*/
old_exe_file = rcu_dereference_raw(mm->exe_file);
- if (new_exe_file)
+ if (new_exe_file) {
+ /*
+ * We expect the caller (i.e., sys_execve) to already denied
+ * write access, so this is unlikely to fail.
+ */
+ if (unlikely(deny_write_access(new_exe_file)))
+ return -EACCES;
get_file(new_exe_file);
+ }
rcu_assign_pointer(mm->exe_file, new_exe_file);
- if (old_exe_file)
+ if (old_exe_file) {
+ allow_write_access(old_exe_file);
fput(old_exe_file);
+ }
+ return 0;
+}
+
+/**
+ * replace_mm_exe_file - replace a reference to the mm's executable file
+ *
+ * This changes mm's executable file (shown as symlink /proc/[pid]/exe),
+ * dealing with concurrent invocation and without grabbing the mmap lock in
+ * write mode.
+ *
+ * Main user is sys_prctl(PR_SET_MM_MAP/EXE_FILE).
+ */
+int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
+{
+ struct vm_area_struct *vma;
+ struct file *old_exe_file;
+ int ret = 0;
+
+ /* Forbid mm->exe_file change if old file still mapped. */
+ old_exe_file = get_mm_exe_file(mm);
+ if (old_exe_file) {
+ mmap_read_lock(mm);
+ for (vma = mm->mmap; vma && !ret; vma = vma->vm_next) {
+ if (!vma->vm_file)
+ continue;
+ if (path_equal(&vma->vm_file->f_path,
+ &old_exe_file->f_path))
+ ret = -EBUSY;
+ }
+ mmap_read_unlock(mm);
+ fput(old_exe_file);
+ if (ret)
+ return ret;
+ }
+
+ /* set the new file, lockless */
+ ret = deny_write_access(new_exe_file);
+ if (ret)
+ return -EACCES;
+ get_file(new_exe_file);
+
+ old_exe_file = xchg(&mm->exe_file, new_exe_file);
+ if (old_exe_file) {
+ /*
+ * Don't race with dup_mmap() getting the file and disallowing
+ * write access while someone might open the file writable.
+ */
+ mmap_read_lock(mm);
+ allow_write_access(old_exe_file);
+ fput(old_exe_file);
+ mmap_read_unlock(mm);
+ }
+ return 0;
}
/**
@@ -1189,7 +1263,6 @@ struct file *get_mm_exe_file(struct mm_struct *mm)
rcu_read_unlock();
return exe_file;
}
-EXPORT_SYMBOL(get_mm_exe_file);
/**
* get_task_exe_file - acquire a reference to the task's executable file
@@ -1212,7 +1285,6 @@ struct file *get_task_exe_file(struct task_struct *task)
task_unlock(task);
return exe_file;
}
-EXPORT_SYMBOL(get_task_exe_file);
/**
* get_task_mm - acquire a reference to the task's mm
diff --git a/kernel/futex.c b/kernel/futex.c
index e7b4c6121da4..c15ad276fd15 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1263,6 +1263,36 @@ static int handle_exit_race(u32 __user *uaddr, u32 uval,
return -ESRCH;
}
+static void __attach_to_pi_owner(struct task_struct *p, union futex_key *key,
+ struct futex_pi_state **ps)
+{
+ /*
+ * No existing pi state. First waiter. [2]
+ *
+ * This creates pi_state, we have hb->lock held, this means nothing can
+ * observe this state, wait_lock is irrelevant.
+ */
+ struct futex_pi_state *pi_state = alloc_pi_state();
+
+ /*
+ * Initialize the pi_mutex in locked state and make @p
+ * the owner of it:
+ */
+ rt_mutex_init_proxy_locked(&pi_state->pi_mutex, p);
+
+ /* Store the key for possible exit cleanups: */
+ pi_state->key = *key;
+
+ WARN_ON(!list_empty(&pi_state->list));
+ list_add(&pi_state->list, &p->pi_state_list);
+ /*
+ * Assignment without holding pi_state->pi_mutex.wait_lock is safe
+ * because there is no concurrency as the object is not published yet.
+ */
+ pi_state->owner = p;
+
+ *ps = pi_state;
+}
/*
* Lookup the task for the TID provided from user space and attach to
* it after doing proper sanity checks.
@@ -1272,7 +1302,6 @@ static int attach_to_pi_owner(u32 __user *uaddr, u32 uval, union futex_key *key,
struct task_struct **exiting)
{
pid_t pid = uval & FUTEX_TID_MASK;
- struct futex_pi_state *pi_state;
struct task_struct *p;
/*
@@ -1324,36 +1353,11 @@ static int attach_to_pi_owner(u32 __user *uaddr, u32 uval, union futex_key *key,
return ret;
}
- /*
- * No existing pi state. First waiter. [2]
- *
- * This creates pi_state, we have hb->lock held, this means nothing can
- * observe this state, wait_lock is irrelevant.
- */
- pi_state = alloc_pi_state();
-
- /*
- * Initialize the pi_mutex in locked state and make @p
- * the owner of it:
- */
- rt_mutex_init_proxy_locked(&pi_state->pi_mutex, p);
-
- /* Store the key for possible exit cleanups: */
- pi_state->key = *key;
-
- WARN_ON(!list_empty(&pi_state->list));
- list_add(&pi_state->list, &p->pi_state_list);
- /*
- * Assignment without holding pi_state->pi_mutex.wait_lock is safe
- * because there is no concurrency as the object is not published yet.
- */
- pi_state->owner = p;
+ __attach_to_pi_owner(p, key, ps);
raw_spin_unlock_irq(&p->pi_lock);
put_task_struct(p);
- *ps = pi_state;
-
return 0;
}
@@ -1454,8 +1458,26 @@ static int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
newval |= FUTEX_WAITERS;
ret = lock_pi_update_atomic(uaddr, uval, newval);
- /* If the take over worked, return 1 */
- return ret < 0 ? ret : 1;
+ if (ret)
+ return ret;
+
+ /*
+ * If the waiter bit was requested the caller also needs PI
+ * state attached to the new owner of the user space futex.
+ *
+ * @task is guaranteed to be alive and it cannot be exiting
+ * because it is either sleeping or waiting in
+ * futex_requeue_pi_wakeup_sync().
+ *
+ * No need to do the full attach_to_pi_owner() exercise
+ * because @task is known and valid.
+ */
+ if (set_waiters) {
+ raw_spin_lock_irq(&task->pi_lock);
+ __attach_to_pi_owner(task, key, ps);
+ raw_spin_unlock_irq(&task->pi_lock);
+ }
+ return 1;
}
/*
@@ -1939,12 +1961,26 @@ static inline int futex_requeue_pi_wakeup_sync(struct futex_q *q)
* @hb: the hash_bucket of the requeue target futex
*
* During futex_requeue, with requeue_pi=1, it is possible to acquire the
- * target futex if it is uncontended or via a lock steal. Set the futex_q key
- * to the requeue target futex so the waiter can detect the wakeup on the right
- * futex, but remove it from the hb and NULL the rt_waiter so it can detect
- * atomic lock acquisition. Set the q->lock_ptr to the requeue target hb->lock
- * to protect access to the pi_state to fixup the owner later. Must be called
- * with both q->lock_ptr and hb->lock held.
+ * target futex if it is uncontended or via a lock steal.
+ *
+ * 1) Set @q::key to the requeue target futex key so the waiter can detect
+ * the wakeup on the right futex.
+ *
+ * 2) Dequeue @q from the hash bucket.
+ *
+ * 3) Set @q::rt_waiter to NULL so the woken up task can detect atomic lock
+ * acquisition.
+ *
+ * 4) Set the q->lock_ptr to the requeue target hb->lock for the case that
+ * the waiter has to fixup the pi state.
+ *
+ * 5) Complete the requeue state so the waiter can make progress. After
+ * this point the waiter task can return from the syscall immediately in
+ * case that the pi state does not have to be fixed up.
+ *
+ * 6) Wake the waiter task.
+ *
+ * Must be called with both q->lock_ptr and hb->lock held.
*/
static inline
void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
@@ -1998,7 +2034,7 @@ futex_proxy_trylock_atomic(u32 __user *pifutex, struct futex_hash_bucket *hb1,
{
struct futex_q *top_waiter = NULL;
u32 curval;
- int ret, vpid;
+ int ret;
if (get_futex_value_locked(&curval, pifutex))
return -EFAULT;
@@ -2025,7 +2061,7 @@ futex_proxy_trylock_atomic(u32 __user *pifutex, struct futex_hash_bucket *hb1,
* and waiting on the 'waitqueue' futex which is always !PI.
*/
if (!top_waiter->rt_waiter || top_waiter->pi_state)
- ret = -EINVAL;
+ return -EINVAL;
/* Ensure we requeue to the expected futex. */
if (!match_futex(top_waiter->requeue_pi_key, key2))
@@ -2036,17 +2072,23 @@ futex_proxy_trylock_atomic(u32 __user *pifutex, struct futex_hash_bucket *hb1,
return -EAGAIN;
/*
- * Try to take the lock for top_waiter. Set the FUTEX_WAITERS bit in
- * the contended case or if set_waiters is 1. The pi_state is returned
- * in ps in contended cases.
+ * Try to take the lock for top_waiter and set the FUTEX_WAITERS bit
+ * in the contended case or if @set_waiters is true.
+ *
+ * In the contended case PI state is attached to the lock owner. If
+ * the user space lock can be acquired then PI state is attached to
+ * the new owner (@top_waiter->task) when @set_waiters is true.
*/
- vpid = task_pid_vnr(top_waiter->task);
ret = futex_lock_pi_atomic(pifutex, hb2, key2, ps, top_waiter->task,
exiting, set_waiters);
if (ret == 1) {
- /* Dequeue, wake up and update top_waiter::requeue_state */
+ /*
+ * Lock was acquired in user space and PI state was
+ * attached to @top_waiter->task. That means state is fully
+ * consistent and the waiter can return to user space
+ * immediately after the wakeup.
+ */
requeue_pi_wake_futex(top_waiter, key2, hb2);
- return vpid;
} else if (ret < 0) {
/* Rewind top_waiter::requeue_state */
futex_requeue_pi_complete(top_waiter, ret);
@@ -2208,19 +2250,26 @@ retry_private:
&exiting, nr_requeue);
/*
- * At this point the top_waiter has either taken uaddr2 or is
- * waiting on it. If the former, then the pi_state will not
- * exist yet, look it up one more time to ensure we have a
- * reference to it. If the lock was taken, @ret contains the
- * VPID of the top waiter task.
- * If the lock was not taken, we have pi_state and an initial
- * refcount on it. In case of an error we have nothing.
+ * At this point the top_waiter has either taken uaddr2 or
+ * is waiting on it. In both cases pi_state has been
+ * established and an initial refcount on it. In case of an
+ * error there's nothing.
*
* The top waiter's requeue_state is up to date:
*
- * - If the lock was acquired atomically (ret > 0), then
+ * - If the lock was acquired atomically (ret == 1), then
* the state is Q_REQUEUE_PI_LOCKED.
*
+ * The top waiter has been dequeued and woken up and can
+ * return to user space immediately. The kernel/user
+ * space state is consistent. In case that there must be
+ * more waiters requeued the WAITERS bit in the user
+ * space futex is set so the top waiter task has to go
+ * into the syscall slowpath to unlock the futex. This
+ * will block until this requeue operation has been
+ * completed and the hash bucket locks have been
+ * dropped.
+ *
* - If the trylock failed with an error (ret < 0) then
* the state is either Q_REQUEUE_PI_NONE, i.e. "nothing
* happened", or Q_REQUEUE_PI_IGNORE when there was an
@@ -2234,36 +2283,20 @@ retry_private:
* the same sanity checks for requeue_pi as the loop
* below does.
*/
- if (ret > 0) {
- WARN_ON(pi_state);
- task_count++;
- /*
- * If futex_proxy_trylock_atomic() acquired the
- * user space futex, then the user space value
- * @uaddr2 has been set to the @hb1's top waiter
- * task VPID. This task is guaranteed to be alive
- * and cannot be exiting because it is either
- * sleeping or blocked on @hb2 lock.
- *
- * The @uaddr2 futex cannot have waiters either as
- * otherwise futex_proxy_trylock_atomic() would not
- * have succeeded.
- *
- * In order to requeue waiters to @hb2, pi state is
- * required. Hand in the VPID value (@ret) and
- * allocate PI state with an initial refcount on
- * it.
- */
- ret = attach_to_pi_owner(uaddr2, ret, &key2, &pi_state,
- &exiting);
- WARN_ON(ret);
- }
-
switch (ret) {
case 0:
/* We hold a reference on the pi state. */
break;
+ case 1:
+ /*
+ * futex_proxy_trylock_atomic() acquired the user space
+ * futex. Adjust task_count.
+ */
+ task_count++;
+ ret = 0;
+ break;
+
/*
* If the above failed, then pi_state is NULL and
* waiter::requeue_state is correct.
@@ -2395,9 +2428,8 @@ retry_private:
}
/*
- * We took an extra initial reference to the pi_state either in
- * futex_proxy_trylock_atomic() or in attach_to_pi_owner(). We need
- * to drop it here again.
+ * We took an extra initial reference to the pi_state in
+ * futex_proxy_trylock_atomic(). We need to drop it here again.
*/
put_pi_state(pi_state);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 62be16135e7c..19e83e9b723c 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -491,6 +491,7 @@ struct irq_domain *irq_get_default_host(void)
{
return irq_default_domain;
}
+EXPORT_SYMBOL_GPL(irq_get_default_host);
static bool irq_domain_is_nomap(struct irq_domain *domain)
{
diff --git a/kernel/kcsan/atomic.h b/kernel/kcsan/atomic.h
deleted file mode 100644
index 530ae1bda8e7..000000000000
--- a/kernel/kcsan/atomic.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Rules for implicitly atomic memory accesses.
- *
- * Copyright (C) 2019, Google LLC.
- */
-
-#ifndef _KERNEL_KCSAN_ATOMIC_H
-#define _KERNEL_KCSAN_ATOMIC_H
-
-#include <linux/types.h>
-
-/*
- * Special rules for certain memory where concurrent conflicting accesses are
- * common, however, the current convention is to not mark them; returns true if
- * access to @ptr should be considered atomic. Called from slow-path.
- */
-static bool kcsan_is_atomic_special(const volatile void *ptr)
-{
- return false;
-}
-
-#endif /* _KERNEL_KCSAN_ATOMIC_H */
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
index 26709ea65c71..76e67d1e02d4 100644
--- a/kernel/kcsan/core.c
+++ b/kernel/kcsan/core.c
@@ -20,9 +20,9 @@
#include <linux/sched.h>
#include <linux/uaccess.h>
-#include "atomic.h"
#include "encoding.h"
#include "kcsan.h"
+#include "permissive.h"
static bool kcsan_early_enable = IS_ENABLED(CONFIG_KCSAN_EARLY_ENABLE);
unsigned int kcsan_udelay_task = CONFIG_KCSAN_UDELAY_TASK;
@@ -301,9 +301,9 @@ static inline void reset_kcsan_skip(void)
this_cpu_write(kcsan_skip, skip_count);
}
-static __always_inline bool kcsan_is_enabled(void)
+static __always_inline bool kcsan_is_enabled(struct kcsan_ctx *ctx)
{
- return READ_ONCE(kcsan_enabled) && get_ctx()->disable_count == 0;
+ return READ_ONCE(kcsan_enabled) && !ctx->disable_count;
}
/* Introduce delay depending on context and configuration. */
@@ -353,10 +353,18 @@ static noinline void kcsan_found_watchpoint(const volatile void *ptr,
atomic_long_t *watchpoint,
long encoded_watchpoint)
{
+ const bool is_assert = (type & KCSAN_ACCESS_ASSERT) != 0;
+ struct kcsan_ctx *ctx = get_ctx();
unsigned long flags;
bool consumed;
- if (!kcsan_is_enabled())
+ /*
+ * We know a watchpoint exists. Let's try to keep the race-window
+ * between here and finally consuming the watchpoint below as small as
+ * possible -- avoid unneccessarily complex code until consumed.
+ */
+
+ if (!kcsan_is_enabled(ctx))
return;
/*
@@ -364,14 +372,22 @@ static noinline void kcsan_found_watchpoint(const volatile void *ptr,
* reporting a race where e.g. the writer set up the watchpoint, but the
* reader has access_mask!=0, we have to ignore the found watchpoint.
*/
- if (get_ctx()->access_mask != 0)
+ if (ctx->access_mask)
return;
/*
- * Consume the watchpoint as soon as possible, to minimize the chances
- * of !consumed. Consuming the watchpoint must always be guarded by
- * kcsan_is_enabled() check, as otherwise we might erroneously
- * triggering reports when disabled.
+ * If the other thread does not want to ignore the access, and there was
+ * a value change as a result of this thread's operation, we will still
+ * generate a report of unknown origin.
+ *
+ * Use CONFIG_KCSAN_REPORT_RACE_UNKNOWN_ORIGIN=n to filter.
+ */
+ if (!is_assert && kcsan_ignore_address(ptr))
+ return;
+
+ /*
+ * Consuming the watchpoint must be guarded by kcsan_is_enabled() to
+ * avoid erroneously triggering reports if the context is disabled.
*/
consumed = try_consume_watchpoint(watchpoint, encoded_watchpoint);
@@ -391,7 +407,7 @@ static noinline void kcsan_found_watchpoint(const volatile void *ptr,
atomic_long_inc(&kcsan_counters[KCSAN_COUNTER_REPORT_RACES]);
}
- if ((type & KCSAN_ACCESS_ASSERT) != 0)
+ if (is_assert)
atomic_long_inc(&kcsan_counters[KCSAN_COUNTER_ASSERT_FAILURES]);
else
atomic_long_inc(&kcsan_counters[KCSAN_COUNTER_DATA_RACES]);
@@ -409,6 +425,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
unsigned long access_mask;
enum kcsan_value_change value_change = KCSAN_VALUE_CHANGE_MAYBE;
unsigned long ua_flags = user_access_save();
+ struct kcsan_ctx *ctx = get_ctx();
unsigned long irq_flags = 0;
/*
@@ -417,16 +434,14 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
*/
reset_kcsan_skip();
- if (!kcsan_is_enabled())
+ if (!kcsan_is_enabled(ctx))
goto out;
/*
- * Special atomic rules: unlikely to be true, so we check them here in
- * the slow-path, and not in the fast-path in is_atomic(). Call after
- * kcsan_is_enabled(), as we may access memory that is not yet
- * initialized during early boot.
+ * Check to-ignore addresses after kcsan_is_enabled(), as we may access
+ * memory that is not yet initialized during early boot.
*/
- if (!is_assert && kcsan_is_atomic_special(ptr))
+ if (!is_assert && kcsan_ignore_address(ptr))
goto out;
if (!check_encodable((unsigned long)ptr, size)) {
@@ -479,15 +494,6 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
break; /* ignore; we do not diff the values */
}
- if (IS_ENABLED(CONFIG_KCSAN_DEBUG)) {
- kcsan_disable_current();
- pr_err("watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n",
- is_write ? "write" : "read", size, ptr,
- watchpoint_slot((unsigned long)ptr),
- encode_watchpoint((unsigned long)ptr, size, is_write));
- kcsan_enable_current();
- }
-
/*
* Delay this thread, to increase probability of observing a racy
* conflicting access.
@@ -498,7 +504,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
* Re-read value, and check if it is as expected; if not, we infer a
* racy access.
*/
- access_mask = get_ctx()->access_mask;
+ access_mask = ctx->access_mask;
new = 0;
switch (size) {
case 1:
@@ -521,8 +527,14 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
if (access_mask)
diff &= access_mask;
- /* Were we able to observe a value-change? */
- if (diff != 0)
+ /*
+ * Check if we observed a value change.
+ *
+ * Also check if the data race should be ignored (the rules depend on
+ * non-zero diff); if it is to be ignored, the below rules for
+ * KCSAN_VALUE_CHANGE_MAYBE apply.
+ */
+ if (diff && !kcsan_ignore_data_race(size, type, old, new, diff))
value_change = KCSAN_VALUE_CHANGE_TRUE;
/* Check if this access raced with another. */
@@ -644,6 +656,15 @@ void __init kcsan_init(void)
pr_info("enabled early\n");
WRITE_ONCE(kcsan_enabled, true);
}
+
+ if (IS_ENABLED(CONFIG_KCSAN_REPORT_VALUE_CHANGE_ONLY) ||
+ IS_ENABLED(CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC) ||
+ IS_ENABLED(CONFIG_KCSAN_PERMISSIVE) ||
+ IS_ENABLED(CONFIG_KCSAN_IGNORE_ATOMICS)) {
+ pr_warn("non-strict mode configured - use CONFIG_KCSAN_STRICT=y to see all data races\n");
+ } else {
+ pr_info("strict mode configured\n");
+ }
}
/* === Exported interface =================================================== */
diff --git a/kernel/kcsan/kcsan_test.c b/kernel/kcsan/kcsan_test.c
index 8bcffbdef3d3..dc55fd5a36fc 100644
--- a/kernel/kcsan/kcsan_test.c
+++ b/kernel/kcsan/kcsan_test.c
@@ -414,6 +414,14 @@ static noinline void test_kernel_atomic_builtins(void)
__atomic_load_n(&test_var, __ATOMIC_RELAXED);
}
+static noinline void test_kernel_xor_1bit(void)
+{
+ /* Do not report data races between the read-writes. */
+ kcsan_nestable_atomic_begin();
+ test_var ^= 0x10000;
+ kcsan_nestable_atomic_end();
+}
+
/* ===== Test cases ===== */
/* Simple test with normal data race. */
@@ -952,6 +960,29 @@ static void test_atomic_builtins(struct kunit *test)
KUNIT_EXPECT_FALSE(test, match_never);
}
+__no_kcsan
+static void test_1bit_value_change(struct kunit *test)
+{
+ const struct expect_report expect = {
+ .access = {
+ { test_kernel_read, &test_var, sizeof(test_var), 0 },
+ { test_kernel_xor_1bit, &test_var, sizeof(test_var), __KCSAN_ACCESS_RW(KCSAN_ACCESS_WRITE) },
+ },
+ };
+ bool match = false;
+
+ begin_test_checks(test_kernel_read, test_kernel_xor_1bit);
+ do {
+ match = IS_ENABLED(CONFIG_KCSAN_PERMISSIVE)
+ ? report_available()
+ : report_matches(&expect);
+ } while (!end_test_checks(match));
+ if (IS_ENABLED(CONFIG_KCSAN_PERMISSIVE))
+ KUNIT_EXPECT_FALSE(test, match);
+ else
+ KUNIT_EXPECT_TRUE(test, match);
+}
+
/*
* Generate thread counts for all test cases. Values generated are in interval
* [2, 5] followed by exponentially increasing thread counts from 8 to 32.
@@ -1024,6 +1055,7 @@ static struct kunit_case kcsan_test_cases[] = {
KCSAN_KUNIT_CASE(test_jiffies_noreport),
KCSAN_KUNIT_CASE(test_seqlock_noreport),
KCSAN_KUNIT_CASE(test_atomic_builtins),
+ KCSAN_KUNIT_CASE(test_1bit_value_change),
{},
};
diff --git a/kernel/kcsan/permissive.h b/kernel/kcsan/permissive.h
new file mode 100644
index 000000000000..2c01fe4a59ee
--- /dev/null
+++ b/kernel/kcsan/permissive.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Special rules for ignoring entire classes of data-racy memory accesses. None
+ * of the rules here imply that such data races are generally safe!
+ *
+ * All rules in this file can be configured via CONFIG_KCSAN_PERMISSIVE. Keep
+ * them separate from core code to make it easier to audit.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
+
+#ifndef _KERNEL_KCSAN_PERMISSIVE_H
+#define _KERNEL_KCSAN_PERMISSIVE_H
+
+#include <linux/bitops.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+
+/*
+ * Access ignore rules based on address.
+ */
+static __always_inline bool kcsan_ignore_address(const volatile void *ptr)
+{
+ if (!IS_ENABLED(CONFIG_KCSAN_PERMISSIVE))
+ return false;
+
+ /*
+ * Data-racy bitops on current->flags are too common, ignore completely
+ * for now.
+ */
+ return ptr == &current->flags;
+}
+
+/*
+ * Data race ignore rules based on access type and value change patterns.
+ */
+static bool
+kcsan_ignore_data_race(size_t size, int type, u64 old, u64 new, u64 diff)
+{
+ if (!IS_ENABLED(CONFIG_KCSAN_PERMISSIVE))
+ return false;
+
+ /*
+ * Rules here are only for plain read accesses, so that we still report
+ * data races between plain read-write accesses.
+ */
+ if (type || size > sizeof(long))
+ return false;
+
+ /*
+ * A common pattern is checking/setting just 1 bit in a variable; for
+ * example:
+ *
+ * if (flags & SOME_FLAG) { ... }
+ *
+ * and elsewhere flags is updated concurrently:
+ *
+ * flags |= SOME_OTHER_FLAG; // just 1 bit
+ *
+ * While it is still recommended that such accesses be marked
+ * appropriately, in many cases these types of data races are so common
+ * that marking them all is often unrealistic and left to maintainer
+ * preference.
+ *
+ * The assumption in all cases is that with all known compiler
+ * optimizations (including those that tear accesses), because no more
+ * than 1 bit changed, the plain accesses are safe despite the presence
+ * of data races.
+ *
+ * The rules here will ignore the data races if we observe no more than
+ * 1 bit changed.
+ *
+ * Of course many operations can effecively change just 1 bit, but the
+ * general assuption that data races involving 1-bit changes can be
+ * tolerated still applies.
+ *
+ * And in case a true bug is missed, the bug likely manifests as a
+ * reportable data race elsewhere.
+ */
+ if (hweight64(diff) == 1) {
+ /*
+ * Exception: Report data races where the values look like
+ * ordinary booleans (one of them was 0 and the 0th bit was
+ * changed) More often than not, they come with interesting
+ * memory ordering requirements, so let's report them.
+ */
+ if (!((!old || !new) && diff == 1))
+ return true;
+ }
+
+ return false;
+}
+
+#endif /* _KERNEL_KCSAN_PERMISSIVE_H */
diff --git a/kernel/kexec.c b/kernel/kexec.c
index c82c6c06f051..b5e40f069768 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -19,26 +19,9 @@
#include "kexec_internal.h"
-static int copy_user_segment_list(struct kimage *image,
- unsigned long nr_segments,
- struct kexec_segment __user *segments)
-{
- int ret;
- size_t segment_bytes;
-
- /* Read in the segments */
- image->nr_segments = nr_segments;
- segment_bytes = nr_segments * sizeof(*segments);
- ret = copy_from_user(image->segment, segments, segment_bytes);
- if (ret)
- ret = -EFAULT;
-
- return ret;
-}
-
static int kimage_alloc_init(struct kimage **rimage, unsigned long entry,
unsigned long nr_segments,
- struct kexec_segment __user *segments,
+ struct kexec_segment *segments,
unsigned long flags)
{
int ret;
@@ -58,10 +41,8 @@ static int kimage_alloc_init(struct kimage **rimage, unsigned long entry,
return -ENOMEM;
image->start = entry;
-
- ret = copy_user_segment_list(image, nr_segments, segments);
- if (ret)
- goto out_free_image;
+ image->nr_segments = nr_segments;
+ memcpy(image->segment, segments, nr_segments * sizeof(*segments));
if (kexec_on_panic) {
/* Enable special crash kernel control page alloc policy. */
@@ -104,12 +85,23 @@ out_free_image:
}
static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
- struct kexec_segment __user *segments, unsigned long flags)
+ struct kexec_segment *segments, unsigned long flags)
{
struct kimage **dest_image, *image;
unsigned long i;
int ret;
+ /*
+ * Because we write directly to the reserved memory region when loading
+ * crash kernels we need a mutex here to prevent multiple crash kernels
+ * from attempting to load simultaneously, and to prevent a crash kernel
+ * from loading over the top of a in use crash kernel.
+ *
+ * KISS: always take the mutex.
+ */
+ if (!mutex_trylock(&kexec_mutex))
+ return -EBUSY;
+
if (flags & KEXEC_ON_CRASH) {
dest_image = &kexec_crash_image;
if (kexec_crash_image)
@@ -121,7 +113,8 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
if (nr_segments == 0) {
/* Uninstall image */
kimage_free(xchg(dest_image, NULL));
- return 0;
+ ret = 0;
+ goto out_unlock;
}
if (flags & KEXEC_ON_CRASH) {
/*
@@ -134,7 +127,7 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
ret = kimage_alloc_init(&image, entry, nr_segments, segments, flags);
if (ret)
- return ret;
+ goto out_unlock;
if (flags & KEXEC_PRESERVE_CONTEXT)
image->preserve_context = 1;
@@ -171,6 +164,8 @@ out:
arch_kexec_protect_crashkres();
kimage_free(image);
+out_unlock:
+ mutex_unlock(&kexec_mutex);
return ret;
}
@@ -236,7 +231,8 @@ static inline int kexec_load_check(unsigned long nr_segments,
SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
struct kexec_segment __user *, segments, unsigned long, flags)
{
- int result;
+ struct kexec_segment *ksegments;
+ unsigned long result;
result = kexec_load_check(nr_segments, flags);
if (result)
@@ -247,20 +243,12 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
return -EINVAL;
- /* Because we write directly to the reserved memory
- * region when loading crash kernels we need a mutex here to
- * prevent multiple crash kernels from attempting to load
- * simultaneously, and to prevent a crash kernel from loading
- * over the top of a in use crash kernel.
- *
- * KISS: always take the mutex.
- */
- if (!mutex_trylock(&kexec_mutex))
- return -EBUSY;
+ ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0]));
+ if (IS_ERR(ksegments))
+ return PTR_ERR(ksegments);
- result = do_kexec_load(entry, nr_segments, segments, flags);
-
- mutex_unlock(&kexec_mutex);
+ result = do_kexec_load(entry, nr_segments, ksegments, flags);
+ kfree(ksegments);
return result;
}
@@ -272,7 +260,7 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
compat_ulong_t, flags)
{
struct compat_kexec_segment in;
- struct kexec_segment out, __user *ksegments;
+ struct kexec_segment *ksegments;
unsigned long i, result;
result = kexec_load_check(nr_segments, flags);
@@ -285,37 +273,26 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT)
return -EINVAL;
- ksegments = compat_alloc_user_space(nr_segments * sizeof(out));
+ ksegments = kmalloc_array(nr_segments, sizeof(ksegments[0]),
+ GFP_KERNEL);
+ if (!ksegments)
+ return -ENOMEM;
+
for (i = 0; i < nr_segments; i++) {
result = copy_from_user(&in, &segments[i], sizeof(in));
if (result)
- return -EFAULT;
+ goto fail;
- out.buf = compat_ptr(in.buf);
- out.bufsz = in.bufsz;
- out.mem = in.mem;
- out.memsz = in.memsz;
-
- result = copy_to_user(&ksegments[i], &out, sizeof(out));
- if (result)
- return -EFAULT;
+ ksegments[i].buf = compat_ptr(in.buf);
+ ksegments[i].bufsz = in.bufsz;
+ ksegments[i].mem = in.mem;
+ ksegments[i].memsz = in.memsz;
}
- /* Because we write directly to the reserved memory
- * region when loading crash kernels we need a mutex here to
- * prevent multiple crash kernels from attempting to load
- * simultaneously, and to prevent a crash kernel from loading
- * over the top of a in use crash kernel.
- *
- * KISS: always take the mutex.
- */
- if (!mutex_trylock(&kexec_mutex))
- return -EBUSY;
-
result = do_kexec_load(entry, nr_segments, ksegments, flags);
- mutex_unlock(&kexec_mutex);
-
+fail:
+ kfree(ksegments);
return result;
}
#endif
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 3a4beb9395c4..291b857a6e20 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -411,7 +411,7 @@ void klp_try_complete_transition(void)
/*
* Ditto for the idle "swapper" tasks.
*/
- get_online_cpus();
+ cpus_read_lock();
for_each_possible_cpu(cpu) {
task = idle_task(cpu);
if (cpu_online(cpu)) {
@@ -423,7 +423,7 @@ void klp_try_complete_transition(void)
task->patch_state = klp_target_state;
}
}
- put_online_cpus();
+ cpus_read_unlock();
if (!complete) {
if (klp_signals_cnt && !(klp_signals_cnt % SIGNALS_TIMEOUT))
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 8eabdc79602b..6bb116c559b4 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -753,7 +753,7 @@ static int __sched rt_mutex_adjust_prio_chain(struct task_struct *task,
* other configuration and we fail to report; also, see
* lockdep.
*/
- if (IS_ENABLED(CONFIG_PREEMPT_RT) && orig_waiter->ww_ctx)
+ if (IS_ENABLED(CONFIG_PREEMPT_RT) && orig_waiter && orig_waiter->ww_ctx)
ret = 0;
raw_spin_unlock(&lock->wait_lock);
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
index 9215b4d6a9de..000e8d5a2884 100644
--- a/kernel/locking/rwsem.c
+++ b/kernel/locking/rwsem.c
@@ -1376,15 +1376,17 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
#include "rwbase_rt.c"
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-void __rwsem_init(struct rw_semaphore *sem, const char *name,
+void __init_rwsem(struct rw_semaphore *sem, const char *name,
struct lock_class_key *key)
{
+ init_rwbase_rt(&(sem)->rwbase);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
debug_check_no_locks_freed((void *)sem, sizeof(*sem));
lockdep_init_map_wait(&sem->dep_map, name, key, 0, LD_WAIT_SLEEP);
-}
-EXPORT_SYMBOL(__rwsem_init);
#endif
+}
+EXPORT_SYMBOL(__init_rwsem);
static inline void __down_read(struct rw_semaphore *sem)
{
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index abc01fcad8c7..eec72ca962e2 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -568,6 +568,6 @@ out:
int __init nsproxy_cache_init(void)
{
- nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC);
+ nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC|SLAB_ACCOUNT);
return 0;
}
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index ca43239a255a..a46a3723bc66 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -51,7 +51,8 @@ static struct kmem_cache *create_pid_cachep(unsigned int level)
mutex_lock(&pid_caches_mutex);
/* Name collision forces to do allocation under mutex. */
if (!*pkc)
- *pkc = kmem_cache_create(name, len, 0, SLAB_HWCACHE_ALIGN, 0);
+ *pkc = kmem_cache_create(name, len, 0,
+ SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, 0);
mutex_unlock(&pid_caches_mutex);
/* current can fail, but someone else can succeed. */
return READ_ONCE(*pkc);
@@ -449,7 +450,7 @@ const struct proc_ns_operations pidns_for_children_operations = {
static __init int pid_namespaces_init(void)
{
- pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC);
+ pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC | SLAB_ACCOUNT);
#ifdef CONFIG_CHECKPOINT_RESTORE
register_sysctl_paths(kern_path, pid_ns_ctl_table);
diff --git a/kernel/profile.c b/kernel/profile.c
index c2ebddb5e974..eb9c7f0f5ac5 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -41,7 +41,8 @@ struct profile_hit {
#define NR_PROFILE_GRP (NR_PROFILE_HIT/PROFILE_GRPSZ)
static atomic_t *prof_buffer;
-static unsigned long prof_len, prof_shift;
+static unsigned long prof_len;
+static unsigned short int prof_shift;
int prof_on __read_mostly;
EXPORT_SYMBOL_GPL(prof_on);
@@ -67,8 +68,8 @@ int profile_setup(char *str)
if (str[strlen(sleepstr)] == ',')
str += strlen(sleepstr) + 1;
if (get_option(&str, &par))
- prof_shift = par;
- pr_info("kernel sleep profiling enabled (shift: %ld)\n",
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+ pr_info("kernel sleep profiling enabled (shift: %u)\n",
prof_shift);
#else
pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
@@ -78,21 +79,21 @@ int profile_setup(char *str)
if (str[strlen(schedstr)] == ',')
str += strlen(schedstr) + 1;
if (get_option(&str, &par))
- prof_shift = par;
- pr_info("kernel schedule profiling enabled (shift: %ld)\n",
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+ pr_info("kernel schedule profiling enabled (shift: %u)\n",
prof_shift);
} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
prof_on = KVM_PROFILING;
if (str[strlen(kvmstr)] == ',')
str += strlen(kvmstr) + 1;
if (get_option(&str, &par))
- prof_shift = par;
- pr_info("kernel KVM profiling enabled (shift: %ld)\n",
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
+ pr_info("kernel KVM profiling enabled (shift: %u)\n",
prof_shift);
} else if (get_option(&str, &par)) {
- prof_shift = par;
+ prof_shift = clamp(par, 0, BITS_PER_LONG - 1);
prof_on = CPU_PROFILING;
- pr_info("kernel profiling enabled (shift: %ld)\n",
+ pr_info("kernel profiling enabled (shift: %u)\n",
prof_shift);
}
return 1;
@@ -468,7 +469,7 @@ read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
unsigned long p = *ppos;
ssize_t read;
char *pnt;
- unsigned int sample_step = 1 << prof_shift;
+ unsigned long sample_step = 1UL << prof_shift;
profile_flip_buffers();
if (p >= (prof_len+1)*sizeof(unsigned int))
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c4462c454ab9..1bba4128a3e6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8836,7 +8836,6 @@ static void balance_push(struct rq *rq)
struct task_struct *push_task = rq->curr;
lockdep_assert_rq_held(rq);
- SCHED_WARN_ON(rq->cpu != smp_processor_id());
/*
* Ensure the thing is persistent until balance_push_set(.on = false);
@@ -8844,9 +8843,10 @@ static void balance_push(struct rq *rq)
rq->balance_callback = &balance_push_callback;
/*
- * Only active while going offline.
+ * Only active while going offline and when invoked on the outgoing
+ * CPU.
*/
- if (!cpu_dying(rq->cpu))
+ if (!cpu_dying(rq->cpu) || rq != this_rq())
return;
/*
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 912b47aa99d8..d17b0a5ce6ac 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -379,10 +379,10 @@ void play_idle_precise(u64 duration_ns, u64 latency_ns)
cpuidle_use_deepest_state(latency_ns);
it.done = 0;
- hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
it.timer.function = idle_inject_timer_fn;
hrtimer_start(&it.timer, ns_to_ktime(duration_ns),
- HRTIMER_MODE_REL_PINNED);
+ HRTIMER_MODE_REL_PINNED_HARD);
while (!READ_ONCE(it.done))
do_idle();
diff --git a/kernel/signal.c b/kernel/signal.c
index cf7e2505ae31..952741f6d0f9 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -4726,7 +4726,7 @@ void __init signals_init(void)
{
siginfo_buildtime_checks();
- sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
+ sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC | SLAB_ACCOUNT);
}
#ifdef CONFIG_KGDB_KDB
diff --git a/kernel/sys.c b/kernel/sys.c
index 72c7639e3c98..8fdac0d90504 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1847,7 +1847,6 @@ SYSCALL_DEFINE1(umask, int, mask)
static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
{
struct fd exe;
- struct file *old_exe, *exe_file;
struct inode *inode;
int err;
@@ -1870,40 +1869,10 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
if (err)
goto exit;
- /*
- * Forbid mm->exe_file change if old file still mapped.
- */
- exe_file = get_mm_exe_file(mm);
- err = -EBUSY;
- if (exe_file) {
- struct vm_area_struct *vma;
-
- mmap_read_lock(mm);
- for (vma = mm->mmap; vma; vma = vma->vm_next) {
- if (!vma->vm_file)
- continue;
- if (path_equal(&vma->vm_file->f_path,
- &exe_file->f_path))
- goto exit_err;
- }
-
- mmap_read_unlock(mm);
- fput(exe_file);
- }
-
- err = 0;
- /* set the new file, lockless */
- get_file(exe.file);
- old_exe = xchg(&mm->exe_file, exe.file);
- if (old_exe)
- fput(old_exe);
+ err = replace_mm_exe_file(mm, exe.file);
exit:
fdput(exe);
return err;
-exit_err:
- mmap_read_unlock(mm);
- fput(exe_file);
- goto exit;
}
/*
@@ -1961,13 +1930,6 @@ static int validate_prctl_map_addr(struct prctl_mm_map *prctl_map)
error = -EINVAL;
/*
- * @brk should be after @end_data in traditional maps.
- */
- if (prctl_map->start_brk <= prctl_map->end_data ||
- prctl_map->brk <= prctl_map->end_data)
- goto out;
-
- /*
* Neither we should allow to override limits if they set.
*/
if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk,
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index cb6f98f5c97a..f43d89d92860 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -289,17 +289,13 @@ COND_SYSCALL(munlockall);
COND_SYSCALL(mincore);
COND_SYSCALL(madvise);
COND_SYSCALL(process_madvise);
+COND_SYSCALL(process_mrelease);
COND_SYSCALL(remap_file_pages);
COND_SYSCALL(mbind);
-COND_SYSCALL_COMPAT(mbind);
COND_SYSCALL(get_mempolicy);
-COND_SYSCALL_COMPAT(get_mempolicy);
COND_SYSCALL(set_mempolicy);
-COND_SYSCALL_COMPAT(set_mempolicy);
COND_SYSCALL(migrate_pages);
-COND_SYSCALL_COMPAT(migrate_pages);
COND_SYSCALL(move_pages);
-COND_SYSCALL_COMPAT(move_pages);
COND_SYSCALL(perf_event_open);
COND_SYSCALL(accept4);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 25e49b4d8049..083be6af29d7 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2912,7 +2912,7 @@ static struct ctl_table vm_table[] = {
.data = &sysctl_compaction_proactiveness,
.maxlen = sizeof(sysctl_compaction_proactiveness),
.mode = 0644,
- .proc_handler = proc_dointvec_minmax,
+ .proc_handler = compaction_proactiveness_sysctl_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = &one_hundred,
},
diff --git a/kernel/time/namespace.c b/kernel/time/namespace.c
index 12eab0d2ae28..aec832801c26 100644
--- a/kernel/time/namespace.c
+++ b/kernel/time/namespace.c
@@ -88,13 +88,13 @@ static struct time_namespace *clone_time_ns(struct user_namespace *user_ns,
goto fail;
err = -ENOMEM;
- ns = kmalloc(sizeof(*ns), GFP_KERNEL);
+ ns = kmalloc(sizeof(*ns), GFP_KERNEL_ACCOUNT);
if (!ns)
goto fail_dec;
refcount_set(&ns->ns.count, 1);
- ns->vvar_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ ns->vvar_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!ns->vvar_page)
goto fail_free;
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 3913222e7bcf..1cd10b102c51 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -273,8 +273,8 @@ static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp)
static __init int init_posix_timers(void)
{
posix_timers_cache = kmem_cache_create("posix_timers_cache",
- sizeof (struct k_itimer), 0, SLAB_PANIC,
- NULL);
+ sizeof(struct k_itimer), 0,
+ SLAB_PANIC | SLAB_ACCOUNT, NULL);
return 0;
}
__initcall(init_posix_timers);
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 3ee23f4d437f..420ff4bc67fd 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -135,10 +135,9 @@ config TRACING_SUPPORT
depends on STACKTRACE_SUPPORT
default y
-if TRACING_SUPPORT
-
menuconfig FTRACE
bool "Tracers"
+ depends on TRACING_SUPPORT
default y if DEBUG_KERNEL
help
Enable the kernel tracing infrastructure.
@@ -1037,6 +1036,3 @@ config HIST_TRIGGERS_DEBUG
If unsure, say N.
endif # FTRACE
-
-endif # TRACING_SUPPORT
-
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index b1c47ccf4f73..6de5d4d63165 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -77,6 +77,7 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
endif
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
obj-$(CONFIG_EVENT_TRACING) += trace_events_trigger.o
+obj-$(CONFIG_PROBE_EVENTS) += trace_eprobe.o
obj-$(CONFIG_TRACE_EVENT_INJECT) += trace_events_inject.o
obj-$(CONFIG_SYNTH_EVENTS) += trace_events_synth.o
obj-$(CONFIG_HIST_TRIGGERS) += trace_events_hist.o
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index e592d1df6f88..c5a3fbf19617 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2111,7 +2111,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
}
}
- get_online_cpus();
+ cpus_read_lock();
/*
* Fire off all the required work handlers
* We can't schedule on offline CPUs, but it's not necessary
@@ -2143,7 +2143,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
cpu_buffer->nr_pages_to_update = 0;
}
- put_online_cpus();
+ cpus_read_unlock();
} else {
cpu_buffer = buffer->buffers[cpu_id];
@@ -2171,7 +2171,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
goto out_err;
}
- get_online_cpus();
+ cpus_read_lock();
/* Can't run something on an offline CPU. */
if (!cpu_online(cpu_id))
@@ -2183,7 +2183,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
}
cpu_buffer->nr_pages_to_update = 0;
- put_online_cpus();
+ cpus_read_unlock();
}
out:
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2755534b0737..7896d30d90f7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2603,6 +2603,15 @@ enum print_line_t trace_handle_return(struct trace_seq *s)
}
EXPORT_SYMBOL_GPL(trace_handle_return);
+static unsigned short migration_disable_value(void)
+{
+#if defined(CONFIG_SMP)
+ return current->migration_disabled;
+#else
+ return 0;
+#endif
+}
+
unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status)
{
unsigned int trace_flags = irqs_status;
@@ -2621,7 +2630,8 @@ unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status)
trace_flags |= TRACE_FLAG_NEED_RESCHED;
if (test_preempt_need_resched())
trace_flags |= TRACE_FLAG_PREEMPT_RESCHED;
- return (trace_flags << 16) | (pc & 0xff);
+ return (trace_flags << 16) | (min_t(unsigned int, pc & 0xff, 0xf)) |
+ (min_t(unsigned int, migration_disable_value(), 0xf)) << 4;
}
struct ring_buffer_event *
@@ -3697,11 +3707,11 @@ static bool trace_safe_str(struct trace_iterator *iter, const char *str)
return false;
event = container_of(trace_event, struct trace_event_call, event);
- if (!event->mod)
+ if ((event->flags & TRACE_EVENT_FL_DYNAMIC) || !event->module)
return false;
/* Would rather have rodata, but this will suffice */
- if (within_module_core(addr, event->mod))
+ if (within_module_core(addr, event->module))
return true;
return false;
@@ -4189,9 +4199,10 @@ static void print_lat_help_header(struct seq_file *m)
"# | / _----=> need-resched \n"
"# || / _---=> hardirq/softirq \n"
"# ||| / _--=> preempt-depth \n"
- "# |||| / delay \n"
- "# cmd pid ||||| time | caller \n"
- "# \\ / ||||| \\ | / \n");
+ "# |||| / _-=> migrate-disable \n"
+ "# ||||| / delay \n"
+ "# cmd pid |||||| time | caller \n"
+ "# \\ / |||||| \\ | / \n");
}
static void print_event_info(struct array_buffer *buf, struct seq_file *m)
@@ -4229,9 +4240,10 @@ static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file
seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space);
seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space);
seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space);
- seq_printf(m, "# %.*s||| / delay\n", prec, space);
- seq_printf(m, "# TASK-PID %.*s CPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID ");
- seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | ");
+ seq_printf(m, "# %.*s||| / _-=> migrate-disable\n", prec, space);
+ seq_printf(m, "# %.*s|||| / delay\n", prec, space);
+ seq_printf(m, "# TASK-PID %.*s CPU# ||||| TIMESTAMP FUNCTION\n", prec, " TGID ");
+ seq_printf(m, "# | | %.*s | ||||| | |\n", prec, " | ");
}
void
@@ -5543,6 +5555,7 @@ static const char readme_msg[] =
#ifdef CONFIG_HIST_TRIGGERS
"\t s:[synthetic/]<event> <field> [<field>]\n"
#endif
+ "\t e[:[<group>/]<event>] <attached-group>.<attached-event> [<args>]\n"
"\t -:[<group>/]<event>\n"
#ifdef CONFIG_KPROBE_EVENTS
"\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n"
@@ -5552,7 +5565,7 @@ static const char readme_msg[] =
" place (uprobe): <path>:<offset>[%return][(ref_ctr_offset)]\n"
#endif
"\t args: <name>=fetcharg[:type]\n"
- "\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n"
+ "\t fetcharg: (%<register>|$<efield>), @<address>, @<symbol>[+|-<offset>],\n"
#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
"\t $stack<index>, $stack, $retval, $comm, $arg<N>,\n"
#else
@@ -5567,6 +5580,8 @@ static const char readme_msg[] =
"\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n"
"\t [unsigned] char/int/long\n"
#endif
+ "\t efield: For event probes ('e' types), the field is on of the fields\n"
+ "\t of the <attached-group>/<attached-event>.\n"
#endif
" events/\t\t- Directory containing all trace event subsystems:\n"
" enable\t\t- Write 0/1 to enable/disable tracing of all events\n"
@@ -5654,6 +5669,7 @@ static const char readme_msg[] =
"\t .execname display a common_pid as a program name\n"
"\t .syscall display a syscall id as a syscall name\n"
"\t .log2 display log2 value rather than raw number\n"
+ "\t .buckets=size display values in groups of size rather than raw number\n"
"\t .usecs display a common_timestamp in microseconds\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4a0e693000c6..b7c0f8e160fb 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -126,6 +126,11 @@ struct kprobe_trace_entry_head {
unsigned long ip;
};
+struct eprobe_trace_entry_head {
+ struct trace_entry ent;
+ unsigned int type;
+};
+
struct kretprobe_trace_entry_head {
struct trace_entry ent;
unsigned long func;
@@ -1508,9 +1513,14 @@ static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
extern int register_trigger_cmds(void);
extern void clear_event_triggers(struct trace_array *tr);
+enum {
+ EVENT_TRIGGER_FL_PROBE = BIT(0),
+};
+
struct event_trigger_data {
unsigned long count;
int ref;
+ int flags;
struct event_trigger_ops *ops;
struct event_command *cmd_ops;
struct event_filter __rcu *filter;
@@ -1918,6 +1928,14 @@ static inline bool is_good_name(const char *name)
return true;
}
+/* Convert certain expected symbols into '_' when generating event names */
+static inline void sanitize_event_name(char *name)
+{
+ while (*name++ != '\0')
+ if (*name == ':' || *name == '.')
+ *name = '_';
+}
+
/*
* This is a generic way to read and write a u64 value from a file in tracefs.
*
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 94ef2d099e32..8d252f63cd78 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -171,6 +171,289 @@ trace_boot_add_synth_event(struct xbc_node *node, const char *event)
}
#endif
+#ifdef CONFIG_HIST_TRIGGERS
+static int __init __printf(3, 4)
+append_printf(char **bufp, char *end, const char *fmt, ...)
+{
+ va_list args;
+ int ret;
+
+ if (*bufp == end)
+ return -ENOSPC;
+
+ va_start(args, fmt);
+ ret = vsnprintf(*bufp, end - *bufp, fmt, args);
+ if (ret < end - *bufp) {
+ *bufp += ret;
+ } else {
+ *bufp = end;
+ ret = -ERANGE;
+ }
+ va_end(args);
+
+ return ret;
+}
+
+static int __init
+append_str_nospace(char **bufp, char *end, const char *str)
+{
+ char *p = *bufp;
+ int len;
+
+ while (p < end - 1 && *str != '\0') {
+ if (!isspace(*str))
+ *(p++) = *str;
+ str++;
+ }
+ *p = '\0';
+ if (p == end - 1) {
+ *bufp = end;
+ return -ENOSPC;
+ }
+ len = p - *bufp;
+ *bufp = p;
+ return (int)len;
+}
+
+static int __init
+trace_boot_hist_add_array(struct xbc_node *hnode, char **bufp,
+ char *end, const char *key)
+{
+ struct xbc_node *anode;
+ const char *p;
+ char sep;
+
+ p = xbc_node_find_value(hnode, key, &anode);
+ if (p) {
+ if (!anode) {
+ pr_err("hist.%s requires value(s).\n", key);
+ return -EINVAL;
+ }
+
+ append_printf(bufp, end, ":%s", key);
+ sep = '=';
+ xbc_array_for_each_value(anode, p) {
+ append_printf(bufp, end, "%c%s", sep, p);
+ if (sep == '=')
+ sep = ',';
+ }
+ } else
+ return -ENOENT;
+
+ return 0;
+}
+
+static int __init
+trace_boot_hist_add_one_handler(struct xbc_node *hnode, char **bufp,
+ char *end, const char *handler,
+ const char *param)
+{
+ struct xbc_node *knode, *anode;
+ const char *p;
+ char sep;
+
+ /* Compose 'handler' parameter */
+ p = xbc_node_find_value(hnode, param, NULL);
+ if (!p) {
+ pr_err("hist.%s requires '%s' option.\n",
+ xbc_node_get_data(hnode), param);
+ return -EINVAL;
+ }
+ append_printf(bufp, end, ":%s(%s)", handler, p);
+
+ /* Compose 'action' parameter */
+ knode = xbc_node_find_subkey(hnode, "trace");
+ if (!knode)
+ knode = xbc_node_find_subkey(hnode, "save");
+
+ if (knode) {
+ anode = xbc_node_get_child(knode);
+ if (!anode || !xbc_node_is_value(anode)) {
+ pr_err("hist.%s.%s requires value(s).\n",
+ xbc_node_get_data(hnode),
+ xbc_node_get_data(knode));
+ return -EINVAL;
+ }
+
+ append_printf(bufp, end, ".%s", xbc_node_get_data(knode));
+ sep = '(';
+ xbc_array_for_each_value(anode, p) {
+ append_printf(bufp, end, "%c%s", sep, p);
+ if (sep == '(')
+ sep = ',';
+ }
+ append_printf(bufp, end, ")");
+ } else if (xbc_node_find_subkey(hnode, "snapshot")) {
+ append_printf(bufp, end, ".snapshot()");
+ } else {
+ pr_err("hist.%s requires an action.\n",
+ xbc_node_get_data(hnode));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __init
+trace_boot_hist_add_handlers(struct xbc_node *hnode, char **bufp,
+ char *end, const char *param)
+{
+ struct xbc_node *node;
+ const char *p, *handler;
+ int ret;
+
+ handler = xbc_node_get_data(hnode);
+
+ xbc_node_for_each_subkey(hnode, node) {
+ p = xbc_node_get_data(node);
+ if (!isdigit(p[0]))
+ continue;
+ /* All digit started node should be instances. */
+ ret = trace_boot_hist_add_one_handler(node, bufp, end, handler, param);
+ if (ret < 0)
+ break;
+ }
+
+ if (xbc_node_find_subkey(hnode, param))
+ ret = trace_boot_hist_add_one_handler(hnode, bufp, end, handler, param);
+
+ return ret;
+}
+
+/*
+ * Histogram boottime tracing syntax.
+ *
+ * ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist[.N] {
+ * keys = <KEY>[,...]
+ * values = <VAL>[,...]
+ * sort = <SORT-KEY>[,...]
+ * size = <ENTRIES>
+ * name = <HISTNAME>
+ * var { <VAR> = <EXPR> ... }
+ * pause|continue|clear
+ * onmax|onchange[.N] { var = <VAR>; <ACTION> [= <PARAM>] }
+ * onmatch[.N] { event = <EVENT>; <ACTION> [= <PARAM>] }
+ * filter = <FILTER>
+ * }
+ *
+ * Where <ACTION> are;
+ *
+ * trace = <EVENT>, <ARG1>[, ...]
+ * save = <ARG1>[, ...]
+ * snapshot
+ */
+static int __init
+trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)
+{
+ struct xbc_node *node, *knode;
+ char *end = buf + size;
+ const char *p;
+ int ret = 0;
+
+ append_printf(&buf, end, "hist");
+
+ ret = trace_boot_hist_add_array(hnode, &buf, end, "keys");
+ if (ret < 0) {
+ if (ret == -ENOENT)
+ pr_err("hist requires keys.\n");
+ return -EINVAL;
+ }
+
+ ret = trace_boot_hist_add_array(hnode, &buf, end, "values");
+ if (ret == -EINVAL)
+ return ret;
+ ret = trace_boot_hist_add_array(hnode, &buf, end, "sort");
+ if (ret == -EINVAL)
+ return ret;
+
+ p = xbc_node_find_value(hnode, "size", NULL);
+ if (p)
+ append_printf(&buf, end, ":size=%s", p);
+
+ p = xbc_node_find_value(hnode, "name", NULL);
+ if (p)
+ append_printf(&buf, end, ":name=%s", p);
+
+ node = xbc_node_find_subkey(hnode, "var");
+ if (node) {
+ xbc_node_for_each_key_value(node, knode, p) {
+ /* Expression must not include spaces. */
+ append_printf(&buf, end, ":%s=",
+ xbc_node_get_data(knode));
+ append_str_nospace(&buf, end, p);
+ }
+ }
+
+ /* Histogram control attributes (mutual exclusive) */
+ if (xbc_node_find_value(hnode, "pause", NULL))
+ append_printf(&buf, end, ":pause");
+ else if (xbc_node_find_value(hnode, "continue", NULL))
+ append_printf(&buf, end, ":continue");
+ else if (xbc_node_find_value(hnode, "clear", NULL))
+ append_printf(&buf, end, ":clear");
+
+ /* Histogram handler and actions */
+ node = xbc_node_find_subkey(hnode, "onmax");
+ if (node && trace_boot_hist_add_handlers(node, &buf, end, "var") < 0)
+ return -EINVAL;
+ node = xbc_node_find_subkey(hnode, "onchange");
+ if (node && trace_boot_hist_add_handlers(node, &buf, end, "var") < 0)
+ return -EINVAL;
+ node = xbc_node_find_subkey(hnode, "onmatch");
+ if (node && trace_boot_hist_add_handlers(node, &buf, end, "event") < 0)
+ return -EINVAL;
+
+ p = xbc_node_find_value(hnode, "filter", NULL);
+ if (p)
+ append_printf(&buf, end, " if %s", p);
+
+ if (buf == end) {
+ pr_err("hist exceeds the max command length.\n");
+ return -E2BIG;
+ }
+
+ return 0;
+}
+
+static void __init
+trace_boot_init_histograms(struct trace_event_file *file,
+ struct xbc_node *hnode, char *buf, size_t size)
+{
+ struct xbc_node *node;
+ const char *p;
+ char *tmp;
+
+ xbc_node_for_each_subkey(hnode, node) {
+ p = xbc_node_get_data(node);
+ if (!isdigit(p[0]))
+ continue;
+ /* All digit started node should be instances. */
+ if (trace_boot_compose_hist_cmd(node, buf, size) == 0) {
+ tmp = kstrdup(buf, GFP_KERNEL);
+ if (trigger_process_regex(file, buf) < 0)
+ pr_err("Failed to apply hist trigger: %s\n", tmp);
+ kfree(tmp);
+ }
+ }
+
+ if (xbc_node_find_subkey(hnode, "keys")) {
+ if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0) {
+ tmp = kstrdup(buf, GFP_KERNEL);
+ if (trigger_process_regex(file, buf) < 0)
+ pr_err("Failed to apply hist trigger: %s\n", tmp);
+ kfree(tmp);
+ }
+ }
+}
+#else
+static void __init
+trace_boot_init_histograms(struct trace_event_file *file,
+ struct xbc_node *hnode, char *buf, size_t size)
+{
+ /* do nothing */
+}
+#endif
+
static void __init
trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
struct xbc_node *enode)
@@ -205,12 +488,18 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
pr_err("Failed to apply filter: %s\n", buf);
}
- xbc_node_for_each_array_value(enode, "actions", anode, p) {
- if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
- pr_err("action string is too long: %s\n", p);
- else if (trigger_process_regex(file, buf) < 0)
- pr_err("Failed to apply an action: %s\n", buf);
- }
+ if (IS_ENABLED(CONFIG_HIST_TRIGGERS)) {
+ xbc_node_for_each_array_value(enode, "actions", anode, p) {
+ if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
+ pr_err("action string is too long: %s\n", p);
+ else if (trigger_process_regex(file, buf) < 0)
+ pr_err("Failed to apply an action: %s\n", p);
+ }
+ anode = xbc_node_find_subkey(enode, "hist");
+ if (anode)
+ trace_boot_init_histograms(file, anode, buf, ARRAY_SIZE(buf));
+ } else if (xbc_node_find_value(enode, "actions", NULL))
+ pr_err("Failed to apply event actions because CONFIG_HIST_TRIGGERS is not set.\n");
if (xbc_node_find_value(enode, "enable", NULL)) {
if (trace_event_enable_disable(file, 1, 0) < 0)
@@ -228,18 +517,18 @@ trace_boot_init_events(struct trace_array *tr, struct xbc_node *node)
bool enable, enable_all = false;
const char *data;
- node = xbc_node_find_child(node, "event");
+ node = xbc_node_find_subkey(node, "event");
if (!node)
return;
/* per-event key starts with "event.GROUP.EVENT" */
- xbc_node_for_each_child(node, gnode) {
+ xbc_node_for_each_subkey(node, gnode) {
data = xbc_node_get_data(gnode);
if (!strcmp(data, "enable")) {
enable_all = true;
continue;
}
enable = false;
- xbc_node_for_each_child(gnode, enode) {
+ xbc_node_for_each_subkey(gnode, enode) {
data = xbc_node_get_data(enode);
if (!strcmp(data, "enable")) {
enable = true;
@@ -331,11 +620,11 @@ trace_boot_init_instances(struct xbc_node *node)
struct trace_array *tr;
const char *p;
- node = xbc_node_find_child(node, "instance");
+ node = xbc_node_find_subkey(node, "instance");
if (!node)
return;
- xbc_node_for_each_child(node, inode) {
+ xbc_node_for_each_subkey(node, inode) {
p = xbc_node_get_data(inode);
if (!p || *p == '\0')
continue;
diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index e57cc0870892..1110112e55bd 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -13,11 +13,49 @@
#include <linux/tracefs.h>
#include "trace.h"
+#include "trace_output.h" /* for trace_event_sem */
#include "trace_dynevent.h"
static DEFINE_MUTEX(dyn_event_ops_mutex);
static LIST_HEAD(dyn_event_ops_list);
+bool trace_event_dyn_try_get_ref(struct trace_event_call *dyn_call)
+{
+ struct trace_event_call *call;
+ bool ret = false;
+
+ if (WARN_ON_ONCE(!(dyn_call->flags & TRACE_EVENT_FL_DYNAMIC)))
+ return false;
+
+ down_read(&trace_event_sem);
+ list_for_each_entry(call, &ftrace_events, list) {
+ if (call == dyn_call) {
+ atomic_inc(&dyn_call->refcnt);
+ ret = true;
+ }
+ }
+ up_read(&trace_event_sem);
+ return ret;
+}
+
+void trace_event_dyn_put_ref(struct trace_event_call *call)
+{
+ if (WARN_ON_ONCE(!(call->flags & TRACE_EVENT_FL_DYNAMIC)))
+ return;
+
+ if (WARN_ON_ONCE(atomic_read(&call->refcnt) <= 0)) {
+ atomic_set(&call->refcnt, 0);
+ return;
+ }
+
+ atomic_dec(&call->refcnt);
+}
+
+bool trace_event_dyn_busy(struct trace_event_call *call)
+{
+ return atomic_read(&call->refcnt) != 0;
+}
+
int dyn_event_register(struct dyn_event_operations *ops)
{
if (!ops || !ops->create || !ops->show || !ops->is_busy ||
diff --git a/kernel/trace/trace_dynevent.h b/kernel/trace/trace_dynevent.h
index 7754936b57ee..936477a111d3 100644
--- a/kernel/trace/trace_dynevent.h
+++ b/kernel/trace/trace_dynevent.h
@@ -76,13 +76,15 @@ int dyn_event_init(struct dyn_event *ev, struct dyn_event_operations *ops)
return 0;
}
-static inline int dyn_event_add(struct dyn_event *ev)
+static inline int dyn_event_add(struct dyn_event *ev,
+ struct trace_event_call *call)
{
lockdep_assert_held(&event_mutex);
if (!ev || !ev->ops)
return -EINVAL;
+ call->flags |= TRACE_EVENT_FL_DYNAMIC;
list_add_tail(&ev->list, &dyn_event_list);
return 0;
}
diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
new file mode 100644
index 000000000000..3044b762cbd7
--- /dev/null
+++ b/kernel/trace/trace_eprobe.c
@@ -0,0 +1,904 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * event probes
+ *
+ * Part of this code was copied from kernel/trace/trace_kprobe.c written by
+ * Masami Hiramatsu <mhiramat@kernel.org>
+ *
+ * Copyright (C) 2021, VMware Inc, Steven Rostedt <rostedt@goodmis.org>
+ * Copyright (C) 2021, VMware Inc, Tzvetomir Stoyanov tz.stoyanov@gmail.com>
+ *
+ */
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ftrace.h>
+
+#include "trace_dynevent.h"
+#include "trace_probe.h"
+#include "trace_probe_tmpl.h"
+
+#define EPROBE_EVENT_SYSTEM "eprobes"
+
+struct trace_eprobe {
+ /* tracepoint system */
+ const char *event_system;
+
+ /* tracepoint event */
+ const char *event_name;
+
+ struct trace_event_call *event;
+
+ struct dyn_event devent;
+ struct trace_probe tp;
+};
+
+struct eprobe_data {
+ struct trace_event_file *file;
+ struct trace_eprobe *ep;
+};
+
+static int __trace_eprobe_create(int argc, const char *argv[]);
+
+static void trace_event_probe_cleanup(struct trace_eprobe *ep)
+{
+ if (!ep)
+ return;
+ trace_probe_cleanup(&ep->tp);
+ kfree(ep->event_name);
+ kfree(ep->event_system);
+ if (ep->event)
+ trace_event_put_ref(ep->event);
+ kfree(ep);
+}
+
+static struct trace_eprobe *to_trace_eprobe(struct dyn_event *ev)
+{
+ return container_of(ev, struct trace_eprobe, devent);
+}
+
+static int eprobe_dyn_event_create(const char *raw_command)
+{
+ return trace_probe_create(raw_command, __trace_eprobe_create);
+}
+
+static int eprobe_dyn_event_show(struct seq_file *m, struct dyn_event *ev)
+{
+ struct trace_eprobe *ep = to_trace_eprobe(ev);
+ int i;
+
+ seq_printf(m, "e:%s/%s", trace_probe_group_name(&ep->tp),
+ trace_probe_name(&ep->tp));
+ seq_printf(m, " %s.%s", ep->event_system, ep->event_name);
+
+ for (i = 0; i < ep->tp.nr_args; i++)
+ seq_printf(m, " %s=%s", ep->tp.args[i].name, ep->tp.args[i].comm);
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
+static int unregister_trace_eprobe(struct trace_eprobe *ep)
+{
+ /* If other probes are on the event, just unregister eprobe */
+ if (trace_probe_has_sibling(&ep->tp))
+ goto unreg;
+
+ /* Enabled event can not be unregistered */
+ if (trace_probe_is_enabled(&ep->tp))
+ return -EBUSY;
+
+ /* Will fail if probe is being used by ftrace or perf */
+ if (trace_probe_unregister_event_call(&ep->tp))
+ return -EBUSY;
+
+unreg:
+ dyn_event_remove(&ep->devent);
+ trace_probe_unlink(&ep->tp);
+
+ return 0;
+}
+
+static int eprobe_dyn_event_release(struct dyn_event *ev)
+{
+ struct trace_eprobe *ep = to_trace_eprobe(ev);
+ int ret = unregister_trace_eprobe(ep);
+
+ if (!ret)
+ trace_event_probe_cleanup(ep);
+ return ret;
+}
+
+static bool eprobe_dyn_event_is_busy(struct dyn_event *ev)
+{
+ struct trace_eprobe *ep = to_trace_eprobe(ev);
+
+ return trace_probe_is_enabled(&ep->tp);
+}
+
+static bool eprobe_dyn_event_match(const char *system, const char *event,
+ int argc, const char **argv, struct dyn_event *ev)
+{
+ struct trace_eprobe *ep = to_trace_eprobe(ev);
+
+ return strcmp(trace_probe_name(&ep->tp), event) == 0 &&
+ (!system || strcmp(trace_probe_group_name(&ep->tp), system) == 0) &&
+ trace_probe_match_command_args(&ep->tp, argc, argv);
+}
+
+static struct dyn_event_operations eprobe_dyn_event_ops = {
+ .create = eprobe_dyn_event_create,
+ .show = eprobe_dyn_event_show,
+ .is_busy = eprobe_dyn_event_is_busy,
+ .free = eprobe_dyn_event_release,
+ .match = eprobe_dyn_event_match,
+};
+
+static struct trace_eprobe *alloc_event_probe(const char *group,
+ const char *this_event,
+ struct trace_event_call *event,
+ int nargs)
+{
+ struct trace_eprobe *ep;
+ const char *event_name;
+ const char *sys_name;
+ int ret = -ENOMEM;
+
+ if (!event)
+ return ERR_PTR(-ENODEV);
+
+ sys_name = event->class->system;
+ event_name = trace_event_name(event);
+
+ ep = kzalloc(struct_size(ep, tp.args, nargs), GFP_KERNEL);
+ if (!ep) {
+ trace_event_put_ref(event);
+ goto error;
+ }
+ ep->event = event;
+ ep->event_name = kstrdup(event_name, GFP_KERNEL);
+ if (!ep->event_name)
+ goto error;
+ ep->event_system = kstrdup(sys_name, GFP_KERNEL);
+ if (!ep->event_system)
+ goto error;
+
+ ret = trace_probe_init(&ep->tp, this_event, group, false);
+ if (ret < 0)
+ goto error;
+
+ dyn_event_init(&ep->devent, &eprobe_dyn_event_ops);
+ return ep;
+error:
+ trace_event_probe_cleanup(ep);
+ return ERR_PTR(ret);
+}
+
+static int trace_eprobe_tp_arg_update(struct trace_eprobe *ep, int i)
+{
+ struct probe_arg *parg = &ep->tp.args[i];
+ struct ftrace_event_field *field;
+ struct list_head *head;
+
+ head = trace_get_fields(ep->event);
+ list_for_each_entry(field, head, link) {
+ if (!strcmp(parg->code->data, field->name)) {
+ kfree(parg->code->data);
+ parg->code->data = field;
+ return 0;
+ }
+ }
+ kfree(parg->code->data);
+ parg->code->data = NULL;
+ return -ENOENT;
+}
+
+static int eprobe_event_define_fields(struct trace_event_call *event_call)
+{
+ int ret;
+ struct eprobe_trace_entry_head field;
+ struct trace_probe *tp;
+
+ tp = trace_probe_primary_from_call(event_call);
+ if (WARN_ON_ONCE(!tp))
+ return -ENOENT;
+
+ DEFINE_FIELD(unsigned int, type, FIELD_STRING_TYPE, 0);
+
+ return traceprobe_define_arg_fields(event_call, sizeof(field), tp);
+}
+
+static struct trace_event_fields eprobe_fields_array[] = {
+ { .type = TRACE_FUNCTION_TYPE,
+ .define_fields = eprobe_event_define_fields },
+ {}
+};
+
+/* Event entry printers */
+static enum print_line_t
+print_eprobe_event(struct trace_iterator *iter, int flags,
+ struct trace_event *event)
+{
+ struct eprobe_trace_entry_head *field;
+ struct trace_event_call *pevent;
+ struct trace_event *probed_event;
+ struct trace_seq *s = &iter->seq;
+ struct trace_probe *tp;
+
+ field = (struct eprobe_trace_entry_head *)iter->ent;
+ tp = trace_probe_primary_from_call(
+ container_of(event, struct trace_event_call, event));
+ if (WARN_ON_ONCE(!tp))
+ goto out;
+
+ trace_seq_printf(s, "%s: (", trace_probe_name(tp));
+
+ probed_event = ftrace_find_event(field->type);
+ if (probed_event) {
+ pevent = container_of(probed_event, struct trace_event_call, event);
+ trace_seq_printf(s, "%s.%s", pevent->class->system,
+ trace_event_name(pevent));
+ } else {
+ trace_seq_printf(s, "%u", field->type);
+ }
+
+ trace_seq_putc(s, ')');
+
+ if (print_probe_args(s, tp->args, tp->nr_args,
+ (u8 *)&field[1], field) < 0)
+ goto out;
+
+ trace_seq_putc(s, '\n');
+ out:
+ return trace_handle_return(s);
+}
+
+static unsigned long get_event_field(struct fetch_insn *code, void *rec)
+{
+ struct ftrace_event_field *field = code->data;
+ unsigned long val;
+ void *addr;
+
+ addr = rec + field->offset;
+
+ switch (field->size) {
+ case 1:
+ if (field->is_signed)
+ val = *(char *)addr;
+ else
+ val = *(unsigned char *)addr;
+ break;
+ case 2:
+ if (field->is_signed)
+ val = *(short *)addr;
+ else
+ val = *(unsigned short *)addr;
+ break;
+ case 4:
+ if (field->is_signed)
+ val = *(int *)addr;
+ else
+ val = *(unsigned int *)addr;
+ break;
+ default:
+ if (field->is_signed)
+ val = *(long *)addr;
+ else
+ val = *(unsigned long *)addr;
+ break;
+ }
+ return val;
+}
+
+static int get_eprobe_size(struct trace_probe *tp, void *rec)
+{
+ struct probe_arg *arg;
+ int i, len, ret = 0;
+
+ for (i = 0; i < tp->nr_args; i++) {
+ arg = tp->args + i;
+ if (unlikely(arg->dynamic)) {
+ unsigned long val;
+
+ val = get_event_field(arg->code, rec);
+ len = process_fetch_insn_bottom(arg->code + 1, val, NULL, NULL);
+ if (len > 0)
+ ret += len;
+ }
+ }
+
+ return ret;
+}
+
+/* Kprobe specific fetch functions */
+
+/* Note that we don't verify it, since the code does not come from user space */
+static int
+process_fetch_insn(struct fetch_insn *code, void *rec, void *dest,
+ void *base)
+{
+ unsigned long val;
+
+ val = get_event_field(code, rec);
+ return process_fetch_insn_bottom(code + 1, val, dest, base);
+}
+NOKPROBE_SYMBOL(process_fetch_insn)
+
+/* Return the length of string -- including null terminal byte */
+static nokprobe_inline int
+fetch_store_strlen_user(unsigned long addr)
+{
+ const void __user *uaddr = (__force const void __user *)addr;
+
+ return strnlen_user_nofault(uaddr, MAX_STRING_SIZE);
+}
+
+/* Return the length of string -- including null terminal byte */
+static nokprobe_inline int
+fetch_store_strlen(unsigned long addr)
+{
+ int ret, len = 0;
+ u8 c;
+
+#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
+ if (addr < TASK_SIZE)
+ return fetch_store_strlen_user(addr);
+#endif
+
+ do {
+ ret = copy_from_kernel_nofault(&c, (u8 *)addr + len, 1);
+ len++;
+ } while (c && ret == 0 && len < MAX_STRING_SIZE);
+
+ return (ret < 0) ? ret : len;
+}
+
+/*
+ * Fetch a null-terminated string from user. Caller MUST set *(u32 *)buf
+ * with max length and relative data location.
+ */
+static nokprobe_inline int
+fetch_store_string_user(unsigned long addr, void *dest, void *base)
+{
+ const void __user *uaddr = (__force const void __user *)addr;
+ int maxlen = get_loc_len(*(u32 *)dest);
+ void *__dest;
+ long ret;
+
+ if (unlikely(!maxlen))
+ return -ENOMEM;
+
+ __dest = get_loc_data(dest, base);
+
+ ret = strncpy_from_user_nofault(__dest, uaddr, maxlen);
+ if (ret >= 0)
+ *(u32 *)dest = make_data_loc(ret, __dest - base);
+
+ return ret;
+}
+
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)buf with max
+ * length and relative data location.
+ */
+static nokprobe_inline int
+fetch_store_string(unsigned long addr, void *dest, void *base)
+{
+ int maxlen = get_loc_len(*(u32 *)dest);
+ void *__dest;
+ long ret;
+
+#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
+ if ((unsigned long)addr < TASK_SIZE)
+ return fetch_store_string_user(addr, dest, base);
+#endif
+
+ if (unlikely(!maxlen))
+ return -ENOMEM;
+
+ __dest = get_loc_data(dest, base);
+
+ /*
+ * Try to get string again, since the string can be changed while
+ * probing.
+ */
+ ret = strncpy_from_kernel_nofault(__dest, (void *)addr, maxlen);
+ if (ret >= 0)
+ *(u32 *)dest = make_data_loc(ret, __dest - base);
+
+ return ret;
+}
+
+static nokprobe_inline int
+probe_mem_read_user(void *dest, void *src, size_t size)
+{
+ const void __user *uaddr = (__force const void __user *)src;
+
+ return copy_from_user_nofault(dest, uaddr, size);
+}
+
+static nokprobe_inline int
+probe_mem_read(void *dest, void *src, size_t size)
+{
+#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
+ if ((unsigned long)src < TASK_SIZE)
+ return probe_mem_read_user(dest, src, size);
+#endif
+ return copy_from_kernel_nofault(dest, src, size);
+}
+
+/* eprobe handler */
+static inline void
+__eprobe_trace_func(struct eprobe_data *edata, void *rec)
+{
+ struct eprobe_trace_entry_head *entry;
+ struct trace_event_call *call = trace_probe_event_call(&edata->ep->tp);
+ struct trace_event_buffer fbuffer;
+ int dsize;
+
+ if (WARN_ON_ONCE(call != edata->file->event_call))
+ return;
+
+ if (trace_trigger_soft_disabled(edata->file))
+ return;
+
+ fbuffer.trace_ctx = tracing_gen_ctx();
+ fbuffer.trace_file = edata->file;
+
+ dsize = get_eprobe_size(&edata->ep->tp, rec);
+ fbuffer.regs = NULL;
+
+ fbuffer.event =
+ trace_event_buffer_lock_reserve(&fbuffer.buffer, edata->file,
+ call->event.type,
+ sizeof(*entry) + edata->ep->tp.size + dsize,
+ fbuffer.trace_ctx);
+ if (!fbuffer.event)
+ return;
+
+ entry = fbuffer.entry = ring_buffer_event_data(fbuffer.event);
+ if (edata->ep->event)
+ entry->type = edata->ep->event->event.type;
+ else
+ entry->type = 0;
+ store_trace_args(&entry[1], &edata->ep->tp, rec, sizeof(*entry), dsize);
+
+ trace_event_buffer_commit(&fbuffer);
+}
+
+/*
+ * The event probe implementation uses event triggers to get access to
+ * the event it is attached to, but is not an actual trigger. The below
+ * functions are just stubs to fulfill what is needed to use the trigger
+ * infrastructure.
+ */
+static int eprobe_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ return 0;
+}
+
+static void eprobe_trigger_free(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+
+}
+
+static int eprobe_trigger_print(struct seq_file *m,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ /* Do not print eprobe event triggers */
+ return 0;
+}
+
+static void eprobe_trigger_func(struct event_trigger_data *data,
+ struct trace_buffer *buffer, void *rec,
+ struct ring_buffer_event *rbe)
+{
+ struct eprobe_data *edata = data->private_data;
+
+ __eprobe_trace_func(edata, rec);
+}
+
+static struct event_trigger_ops eprobe_trigger_ops = {
+ .func = eprobe_trigger_func,
+ .print = eprobe_trigger_print,
+ .init = eprobe_trigger_init,
+ .free = eprobe_trigger_free,
+};
+
+static int eprobe_trigger_cmd_func(struct event_command *cmd_ops,
+ struct trace_event_file *file,
+ char *glob, char *cmd, char *param)
+{
+ return -1;
+}
+
+static int eprobe_trigger_reg_func(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *data,
+ struct trace_event_file *file)
+{
+ return -1;
+}
+
+static void eprobe_trigger_unreg_func(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *data,
+ struct trace_event_file *file)
+{
+
+}
+
+static struct event_trigger_ops *eprobe_trigger_get_ops(char *cmd,
+ char *param)
+{
+ return &eprobe_trigger_ops;
+}
+
+static struct event_command event_trigger_cmd = {
+ .name = "eprobe",
+ .trigger_type = ETT_EVENT_EPROBE,
+ .flags = EVENT_CMD_FL_NEEDS_REC,
+ .func = eprobe_trigger_cmd_func,
+ .reg = eprobe_trigger_reg_func,
+ .unreg = eprobe_trigger_unreg_func,
+ .unreg_all = NULL,
+ .get_trigger_ops = eprobe_trigger_get_ops,
+ .set_filter = NULL,
+};
+
+static struct event_trigger_data *
+new_eprobe_trigger(struct trace_eprobe *ep, struct trace_event_file *file)
+{
+ struct event_trigger_data *trigger;
+ struct eprobe_data *edata;
+
+ edata = kzalloc(sizeof(*edata), GFP_KERNEL);
+ trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
+ if (!trigger || !edata) {
+ kfree(edata);
+ kfree(trigger);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ trigger->flags = EVENT_TRIGGER_FL_PROBE;
+ trigger->count = -1;
+ trigger->ops = &eprobe_trigger_ops;
+
+ /*
+ * EVENT PROBE triggers are not registered as commands with
+ * register_event_command(), as they are not controlled by the user
+ * from the trigger file
+ */
+ trigger->cmd_ops = &event_trigger_cmd;
+
+ INIT_LIST_HEAD(&trigger->list);
+ RCU_INIT_POINTER(trigger->filter, NULL);
+
+ edata->file = file;
+ edata->ep = ep;
+ trigger->private_data = edata;
+
+ return trigger;
+}
+
+static int enable_eprobe(struct trace_eprobe *ep,
+ struct trace_event_file *eprobe_file)
+{
+ struct event_trigger_data *trigger;
+ struct trace_event_file *file;
+ struct trace_array *tr = eprobe_file->tr;
+
+ file = find_event_file(tr, ep->event_system, ep->event_name);
+ if (!file)
+ return -ENOENT;
+ trigger = new_eprobe_trigger(ep, eprobe_file);
+ if (IS_ERR(trigger))
+ return PTR_ERR(trigger);
+
+ list_add_tail_rcu(&trigger->list, &file->triggers);
+
+ trace_event_trigger_enable_disable(file, 1);
+ update_cond_flag(file);
+
+ return 0;
+}
+
+static struct trace_event_functions eprobe_funcs = {
+ .trace = print_eprobe_event
+};
+
+static int disable_eprobe(struct trace_eprobe *ep,
+ struct trace_array *tr)
+{
+ struct event_trigger_data *trigger;
+ struct trace_event_file *file;
+ struct eprobe_data *edata;
+
+ file = find_event_file(tr, ep->event_system, ep->event_name);
+ if (!file)
+ return -ENOENT;
+
+ list_for_each_entry(trigger, &file->triggers, list) {
+ if (!(trigger->flags & EVENT_TRIGGER_FL_PROBE))
+ continue;
+ edata = trigger->private_data;
+ if (edata->ep == ep)
+ break;
+ }
+ if (list_entry_is_head(trigger, &file->triggers, list))
+ return -ENODEV;
+
+ list_del_rcu(&trigger->list);
+
+ trace_event_trigger_enable_disable(file, 0);
+ update_cond_flag(file);
+ return 0;
+}
+
+static int enable_trace_eprobe(struct trace_event_call *call,
+ struct trace_event_file *file)
+{
+ struct trace_probe *pos, *tp;
+ struct trace_eprobe *ep;
+ bool enabled;
+ int ret = 0;
+
+ tp = trace_probe_primary_from_call(call);
+ if (WARN_ON_ONCE(!tp))
+ return -ENODEV;
+ enabled = trace_probe_is_enabled(tp);
+
+ /* This also changes "enabled" state */
+ if (file) {
+ ret = trace_probe_add_file(tp, file);
+ if (ret)
+ return ret;
+ } else
+ trace_probe_set_flag(tp, TP_FLAG_PROFILE);
+
+ if (enabled)
+ return 0;
+
+ list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+ ep = container_of(pos, struct trace_eprobe, tp);
+ ret = enable_eprobe(ep, file);
+ if (ret)
+ break;
+ enabled = true;
+ }
+
+ if (ret) {
+ /* Failed to enable one of them. Roll back all */
+ if (enabled)
+ disable_eprobe(ep, file->tr);
+ if (file)
+ trace_probe_remove_file(tp, file);
+ else
+ trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
+ }
+
+ return ret;
+}
+
+static int disable_trace_eprobe(struct trace_event_call *call,
+ struct trace_event_file *file)
+{
+ struct trace_probe *pos, *tp;
+ struct trace_eprobe *ep;
+
+ tp = trace_probe_primary_from_call(call);
+ if (WARN_ON_ONCE(!tp))
+ return -ENODEV;
+
+ if (file) {
+ if (!trace_probe_get_file_link(tp, file))
+ return -ENOENT;
+ if (!trace_probe_has_single_file(tp))
+ goto out;
+ trace_probe_clear_flag(tp, TP_FLAG_TRACE);
+ } else
+ trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
+
+ if (!trace_probe_is_enabled(tp)) {
+ list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+ ep = container_of(pos, struct trace_eprobe, tp);
+ disable_eprobe(ep, file->tr);
+ }
+ }
+
+ out:
+ if (file)
+ /*
+ * Synchronization is done in below function. For perf event,
+ * file == NULL and perf_trace_event_unreg() calls
+ * tracepoint_synchronize_unregister() to ensure synchronize
+ * event. We don't need to care about it.
+ */
+ trace_probe_remove_file(tp, file);
+
+ return 0;
+}
+
+static int eprobe_register(struct trace_event_call *event,
+ enum trace_reg type, void *data)
+{
+ struct trace_event_file *file = data;
+
+ switch (type) {
+ case TRACE_REG_REGISTER:
+ return enable_trace_eprobe(event, file);
+ case TRACE_REG_UNREGISTER:
+ return disable_trace_eprobe(event, file);
+#ifdef CONFIG_PERF_EVENTS
+ case TRACE_REG_PERF_REGISTER:
+ case TRACE_REG_PERF_UNREGISTER:
+ case TRACE_REG_PERF_OPEN:
+ case TRACE_REG_PERF_CLOSE:
+ case TRACE_REG_PERF_ADD:
+ case TRACE_REG_PERF_DEL:
+ return 0;
+#endif
+ }
+ return 0;
+}
+
+static inline void init_trace_eprobe_call(struct trace_eprobe *ep)
+{
+ struct trace_event_call *call = trace_probe_event_call(&ep->tp);
+
+ call->flags = TRACE_EVENT_FL_EPROBE;
+ call->event.funcs = &eprobe_funcs;
+ call->class->fields_array = eprobe_fields_array;
+ call->class->reg = eprobe_register;
+}
+
+static struct trace_event_call *
+find_and_get_event(const char *system, const char *event_name)
+{
+ struct trace_event_call *tp_event;
+ const char *name;
+
+ list_for_each_entry(tp_event, &ftrace_events, list) {
+ /* Skip other probes and ftrace events */
+ if (tp_event->flags &
+ (TRACE_EVENT_FL_IGNORE_ENABLE |
+ TRACE_EVENT_FL_KPROBE |
+ TRACE_EVENT_FL_UPROBE |
+ TRACE_EVENT_FL_EPROBE))
+ continue;
+ if (!tp_event->class->system ||
+ strcmp(system, tp_event->class->system))
+ continue;
+ name = trace_event_name(tp_event);
+ if (!name || strcmp(event_name, name))
+ continue;
+ if (!trace_event_try_get_ref(tp_event)) {
+ return NULL;
+ break;
+ }
+ return tp_event;
+ break;
+ }
+ return NULL;
+}
+
+static int trace_eprobe_tp_update_arg(struct trace_eprobe *ep, const char *argv[], int i)
+{
+ unsigned int flags = TPARG_FL_KERNEL | TPARG_FL_TPOINT;
+ int ret;
+
+ ret = traceprobe_parse_probe_arg(&ep->tp, i, argv[i], flags);
+ if (ret)
+ return ret;
+
+ if (ep->tp.args[i].code->op == FETCH_OP_TP_ARG)
+ ret = trace_eprobe_tp_arg_update(ep, i);
+
+ return ret;
+}
+
+static int __trace_eprobe_create(int argc, const char *argv[])
+{
+ /*
+ * Argument syntax:
+ * e[:[GRP/]ENAME] SYSTEM.EVENT [FETCHARGS]
+ * Fetch args:
+ * <name>=$<field>[:TYPE]
+ */
+ const char *event = NULL, *group = EPROBE_EVENT_SYSTEM;
+ const char *sys_event = NULL, *sys_name = NULL;
+ struct trace_event_call *event_call;
+ struct trace_eprobe *ep = NULL;
+ char buf1[MAX_EVENT_NAME_LEN];
+ char buf2[MAX_EVENT_NAME_LEN];
+ int ret = 0;
+ int i;
+
+ if (argc < 2 || argv[0][0] != 'e')
+ return -ECANCELED;
+
+ trace_probe_log_init("event_probe", argc, argv);
+
+ event = strchr(&argv[0][1], ':');
+ if (event) {
+ event++;
+ ret = traceprobe_parse_event_name(&event, &group, buf1,
+ event - argv[0]);
+ if (ret)
+ goto parse_error;
+ } else {
+ strscpy(buf1, argv[1], MAX_EVENT_NAME_LEN);
+ sanitize_event_name(buf1);
+ event = buf1;
+ }
+ if (!is_good_name(event) || !is_good_name(group))
+ goto parse_error;
+
+ sys_event = argv[1];
+ ret = traceprobe_parse_event_name(&sys_event, &sys_name, buf2,
+ sys_event - argv[1]);
+ if (ret || !sys_name)
+ goto parse_error;
+ if (!is_good_name(sys_event) || !is_good_name(sys_name))
+ goto parse_error;
+
+ mutex_lock(&event_mutex);
+ event_call = find_and_get_event(sys_name, sys_event);
+ ep = alloc_event_probe(group, event, event_call, argc - 2);
+ mutex_unlock(&event_mutex);
+
+ if (IS_ERR(ep)) {
+ ret = PTR_ERR(ep);
+ /* This must return -ENOMEM, else there is a bug */
+ WARN_ON_ONCE(ret != -ENOMEM);
+ ep = NULL;
+ goto error;
+ }
+
+ argc -= 2; argv += 2;
+ /* parse arguments */
+ for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+ trace_probe_log_set_index(i + 2);
+ ret = trace_eprobe_tp_update_arg(ep, argv, i);
+ if (ret)
+ goto error;
+ }
+ ret = traceprobe_set_print_fmt(&ep->tp, PROBE_PRINT_EVENT);
+ if (ret < 0)
+ goto error;
+ init_trace_eprobe_call(ep);
+ mutex_lock(&event_mutex);
+ ret = trace_probe_register_event_call(&ep->tp);
+ if (ret) {
+ if (ret == -EEXIST) {
+ trace_probe_log_set_index(0);
+ trace_probe_log_err(0, EVENT_EXIST);
+ }
+ mutex_unlock(&event_mutex);
+ goto error;
+ }
+ ret = dyn_event_add(&ep->devent, &ep->tp.event->call);
+ mutex_unlock(&event_mutex);
+ return ret;
+parse_error:
+ ret = -EINVAL;
+error:
+ trace_event_probe_cleanup(ep);
+ return ret;
+}
+
+/*
+ * Register dynevent at core_initcall. This allows kernel to setup eprobe
+ * events in postcore_initcall without tracefs.
+ */
+static __init int trace_events_eprobe_init_early(void)
+{
+ int err = 0;
+
+ err = dyn_event_register(&eprobe_dyn_event_ops);
+ if (err)
+ pr_warn("Could not register eprobe_dyn_event_ops\n");
+
+ return err;
+}
+core_initcall(trace_events_eprobe_init_early);
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 03be4435d103..6aed10e2f7ce 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -177,7 +177,7 @@ static void perf_trace_event_unreg(struct perf_event *p_event)
}
}
out:
- module_put(tp_event->mod);
+ trace_event_put_ref(tp_event);
}
static int perf_trace_event_open(struct perf_event *p_event)
@@ -224,10 +224,10 @@ int perf_trace_init(struct perf_event *p_event)
list_for_each_entry(tp_event, &ftrace_events, list) {
if (tp_event->event.type == event_id &&
tp_event->class && tp_event->class->reg &&
- try_module_get(tp_event->mod)) {
+ trace_event_try_get_ref(tp_event)) {
ret = perf_trace_event_init(tp_event, p_event);
if (ret)
- module_put(tp_event->mod);
+ trace_event_put_ref(tp_event);
break;
}
}
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 80e96989770e..830b3b9940f4 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -181,6 +181,7 @@ static int trace_define_common_fields(void)
__common_field(unsigned short, type);
__common_field(unsigned char, flags);
+ /* Holds both preempt_count and migrate_disable */
__common_field(unsigned char, preempt_count);
__common_field(int, pid);
@@ -2525,7 +2526,10 @@ __register_event(struct trace_event_call *call, struct module *mod)
return ret;
list_add(&call->list, &ftrace_events);
- call->mod = mod;
+ if (call->flags & TRACE_EVENT_FL_DYNAMIC)
+ atomic_set(&call->refcnt, 0);
+ else
+ call->module = mod;
return 0;
}
@@ -2839,7 +2843,9 @@ static void trace_module_remove_events(struct module *mod)
down_write(&trace_event_sem);
list_for_each_entry_safe(call, p, &ftrace_events, list) {
- if (call->mod == mod)
+ if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module)
+ continue;
+ if (call->module == mod)
__trace_remove_event_call(call);
}
up_write(&trace_event_sem);
@@ -2982,7 +2988,7 @@ struct trace_event_file *trace_get_event_file(const char *instance,
}
/* Don't let event modules unload while in use */
- ret = try_module_get(file->event_call->mod);
+ ret = trace_event_try_get_ref(file->event_call);
if (!ret) {
trace_array_put(tr);
ret = -EBUSY;
@@ -3012,7 +3018,7 @@ EXPORT_SYMBOL_GPL(trace_get_event_file);
void trace_put_event_file(struct trace_event_file *file)
{
mutex_lock(&event_mutex);
- module_put(file->event_call->mod);
+ trace_event_put_ref(file->event_call);
mutex_unlock(&event_mutex);
trace_array_put(file->tr);
@@ -3147,7 +3153,7 @@ static int free_probe_data(void *data)
if (!edata->ref) {
/* Remove the SOFT_MODE flag */
__ftrace_event_enable_disable(edata->file, 0, 1);
- module_put(edata->file->event_call->mod);
+ trace_event_put_ref(edata->file->event_call);
kfree(edata);
}
return 0;
@@ -3280,7 +3286,7 @@ event_enable_func(struct trace_array *tr, struct ftrace_hash *hash,
out_reg:
/* Don't let event modules unload while probe registered */
- ret = try_module_get(file->event_call->mod);
+ ret = trace_event_try_get_ref(file->event_call);
if (!ret) {
ret = -EBUSY;
goto out_free;
@@ -3310,7 +3316,7 @@ event_enable_func(struct trace_array *tr, struct ftrace_hash *hash,
out_disable:
__ftrace_event_enable_disable(file, 0, 1);
out_put:
- module_put(file->event_call->mod);
+ trace_event_put_ref(file->event_call);
out_free:
kfree(data);
goto out;
@@ -3376,7 +3382,8 @@ void __trace_early_add_events(struct trace_array *tr)
list_for_each_entry(call, &ftrace_events, list) {
/* Early boot up should not have any modules loaded */
- if (WARN_ON_ONCE(call->mod))
+ if (!(call->flags & TRACE_EVENT_FL_DYNAMIC) &&
+ WARN_ON_ONCE(call->module))
continue;
ret = __trace_early_add_new_event(call, tr);
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index a48aa2a2875b..a6061a69aa84 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -121,6 +121,7 @@ struct hist_field {
unsigned int size;
unsigned int offset;
unsigned int is_signed;
+ unsigned long buckets;
const char *type;
struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
struct hist_trigger_data *hist_data;
@@ -219,6 +220,27 @@ static u64 hist_field_log2(struct hist_field *hist_field,
return (u64) ilog2(roundup_pow_of_two(val));
}
+static u64 hist_field_bucket(struct hist_field *hist_field,
+ struct tracing_map_elt *elt,
+ struct trace_buffer *buffer,
+ struct ring_buffer_event *rbe,
+ void *event)
+{
+ struct hist_field *operand = hist_field->operands[0];
+ unsigned long buckets = hist_field->buckets;
+
+ u64 val = operand->fn(operand, elt, buffer, rbe, event);
+
+ if (WARN_ON_ONCE(!buckets))
+ return val;
+
+ if (val >= LONG_MAX)
+ val = div64_ul(val, buckets);
+ else
+ val = (u64)((unsigned long)val / buckets);
+ return val * buckets;
+}
+
static u64 hist_field_plus(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct trace_buffer *buffer,
@@ -318,6 +340,7 @@ enum hist_field_flags {
HIST_FIELD_FL_VAR_REF = 1 << 14,
HIST_FIELD_FL_CPU = 1 << 15,
HIST_FIELD_FL_ALIAS = 1 << 16,
+ HIST_FIELD_FL_BUCKET = 1 << 17,
};
struct var_defs {
@@ -485,7 +508,8 @@ struct track_data {
struct hist_elt_data {
char *comm;
u64 *var_ref_vals;
- char *field_var_str[SYNTH_FIELDS_MAX];
+ char **field_var_str;
+ int n_field_var_str;
};
struct snapshot_context {
@@ -1109,7 +1133,8 @@ static const char *hist_field_name(struct hist_field *field,
if (field->field)
field_name = field->field->name;
else if (field->flags & HIST_FIELD_FL_LOG2 ||
- field->flags & HIST_FIELD_FL_ALIAS)
+ field->flags & HIST_FIELD_FL_ALIAS ||
+ field->flags & HIST_FIELD_FL_BUCKET)
field_name = hist_field_name(field->operands[0], ++level);
else if (field->flags & HIST_FIELD_FL_CPU)
field_name = "common_cpu";
@@ -1377,9 +1402,11 @@ static void hist_elt_data_free(struct hist_elt_data *elt_data)
{
unsigned int i;
- for (i = 0; i < SYNTH_FIELDS_MAX; i++)
+ for (i = 0; i < elt_data->n_field_var_str; i++)
kfree(elt_data->field_var_str[i]);
+ kfree(elt_data->field_var_str);
+
kfree(elt_data->comm);
kfree(elt_data);
}
@@ -1396,17 +1423,17 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
struct hist_trigger_data *hist_data = elt->map->private_data;
unsigned int size = TASK_COMM_LEN;
struct hist_elt_data *elt_data;
- struct hist_field *key_field;
+ struct hist_field *hist_field;
unsigned int i, n_str;
elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
if (!elt_data)
return -ENOMEM;
- for_each_hist_key_field(i, hist_data) {
- key_field = hist_data->fields[i];
+ for_each_hist_field(i, hist_data) {
+ hist_field = hist_data->fields[i];
- if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
+ if (hist_field->flags & HIST_FIELD_FL_EXECNAME) {
elt_data->comm = kzalloc(size, GFP_KERNEL);
if (!elt_data->comm) {
kfree(elt_data);
@@ -1427,6 +1454,13 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
size = STR_VAR_LEN_MAX;
+ elt_data->field_var_str = kcalloc(n_str, sizeof(char *), GFP_KERNEL);
+ if (!elt_data->field_var_str) {
+ hist_elt_data_free(elt_data);
+ return -EINVAL;
+ }
+ elt_data->n_field_var_str = n_str;
+
for (i = 0; i < n_str; i++) {
elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
if (!elt_data->field_var_str[i]) {
@@ -1470,6 +1504,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
flags_str = "syscall";
else if (hist_field->flags & HIST_FIELD_FL_LOG2)
flags_str = "log2";
+ else if (hist_field->flags & HIST_FIELD_FL_BUCKET)
+ flags_str = "buckets";
else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
flags_str = "usecs";
@@ -1590,7 +1626,9 @@ static void __destroy_hist_field(struct hist_field *hist_field)
kfree(hist_field->var.name);
kfree(hist_field->name);
- kfree(hist_field->type);
+
+ /* Can likely be a const */
+ kfree_const(hist_field->type);
kfree(hist_field->system);
kfree(hist_field->event_name);
@@ -1647,9 +1685,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
if (flags & HIST_FIELD_FL_HITCOUNT) {
hist_field->fn = hist_field_counter;
hist_field->size = sizeof(u64);
- hist_field->type = kstrdup("u64", GFP_KERNEL);
- if (!hist_field->type)
- goto free;
+ hist_field->type = "u64";
goto out;
}
@@ -1658,12 +1694,13 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
goto out;
}
- if (flags & HIST_FIELD_FL_LOG2) {
- unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
- hist_field->fn = hist_field_log2;
+ if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) {
+ unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET);
+ hist_field->fn = flags & HIST_FIELD_FL_LOG2 ? hist_field_log2 :
+ hist_field_bucket;
hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
hist_field->size = hist_field->operands[0]->size;
- hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
+ hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL);
if (!hist_field->type)
goto free;
goto out;
@@ -1672,18 +1709,14 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
if (flags & HIST_FIELD_FL_TIMESTAMP) {
hist_field->fn = hist_field_timestamp;
hist_field->size = sizeof(u64);
- hist_field->type = kstrdup("u64", GFP_KERNEL);
- if (!hist_field->type)
- goto free;
+ hist_field->type = "u64";
goto out;
}
if (flags & HIST_FIELD_FL_CPU) {
hist_field->fn = hist_field_cpu;
hist_field->size = sizeof(int);
- hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
- if (!hist_field->type)
- goto free;
+ hist_field->type = "unsigned int";
goto out;
}
@@ -1696,7 +1729,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
flags |= HIST_FIELD_FL_STRING;
hist_field->size = MAX_FILTER_STR_VAL;
- hist_field->type = kstrdup(field->type, GFP_KERNEL);
+ hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
if (!hist_field->type)
goto free;
@@ -1709,7 +1742,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
} else {
hist_field->size = field->size;
hist_field->is_signed = field->is_signed;
- hist_field->type = kstrdup(field->type, GFP_KERNEL);
+ hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
if (!hist_field->type)
goto free;
@@ -1795,7 +1828,7 @@ static int init_var_ref(struct hist_field *ref_field,
}
}
- ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
+ ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL);
if (!ref_field->type) {
err = -ENOMEM;
goto free;
@@ -1953,7 +1986,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
static struct ftrace_event_field *
parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
- char *field_str, unsigned long *flags)
+ char *field_str, unsigned long *flags, unsigned long *buckets)
{
struct ftrace_event_field *field = NULL;
char *field_name, *modifier, *str;
@@ -1980,7 +2013,22 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
*flags |= HIST_FIELD_FL_LOG2;
else if (strcmp(modifier, "usecs") == 0)
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
- else {
+ else if (strncmp(modifier, "bucket", 6) == 0) {
+ int ret;
+
+ modifier += 6;
+
+ if (*modifier == 's')
+ modifier++;
+ if (*modifier != '=')
+ goto error;
+ modifier++;
+ ret = kstrtoul(modifier, 0, buckets);
+ if (ret || !(*buckets))
+ goto error;
+ *flags |= HIST_FIELD_FL_BUCKET;
+ } else {
+ error:
hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
field = ERR_PTR(-EINVAL);
goto out;
@@ -2049,6 +2097,7 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
struct ftrace_event_field *field = NULL;
struct hist_field *hist_field = NULL;
+ unsigned long buckets = 0;
int ret = 0;
s = strchr(str, '.');
@@ -2086,7 +2135,7 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
} else
str = s;
- field = parse_field(hist_data, file, str, flags);
+ field = parse_field(hist_data, file, str, flags, &buckets);
if (IS_ERR(field)) {
ret = PTR_ERR(field);
goto out;
@@ -2097,6 +2146,7 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
ret = -ENOMEM;
goto out;
}
+ hist_field->buckets = buckets;
return hist_field;
out:
@@ -2171,7 +2221,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
expr->operands[0] = operand1;
expr->operator = FIELD_OP_UNARY_MINUS;
expr->name = expr_str(expr, 0);
- expr->type = kstrdup(operand1->type, GFP_KERNEL);
+ expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
if (!expr->type) {
ret = -ENOMEM;
goto free;
@@ -2311,7 +2361,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
expr->operator = field_op;
expr->name = expr_str(expr, 0);
- expr->type = kstrdup(operand1->type, GFP_KERNEL);
+ expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
if (!expr->type) {
ret = -ENOMEM;
goto free;
@@ -2699,10 +2749,10 @@ static struct hist_field *create_var(struct hist_trigger_data *hist_data,
var->var.hist_data = var->hist_data = hist_data;
var->size = size;
var->var.name = kstrdup(name, GFP_KERNEL);
- var->type = kstrdup(type, GFP_KERNEL);
+ var->type = kstrdup_const(type, GFP_KERNEL);
if (!var->var.name || !var->type) {
+ kfree_const(var->type);
kfree(var->var.name);
- kfree(var->type);
kfree(var);
var = ERR_PTR(-ENOMEM);
}
@@ -3731,6 +3781,41 @@ static int create_val_field(struct hist_trigger_data *hist_data,
return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
}
+static const char *no_comm = "(no comm)";
+
+static u64 hist_field_execname(struct hist_field *hist_field,
+ struct tracing_map_elt *elt,
+ struct trace_buffer *buffer,
+ struct ring_buffer_event *rbe,
+ void *event)
+{
+ struct hist_elt_data *elt_data;
+
+ if (WARN_ON_ONCE(!elt))
+ return (u64)(unsigned long)no_comm;
+
+ elt_data = elt->private_data;
+
+ if (WARN_ON_ONCE(!elt_data->comm))
+ return (u64)(unsigned long)no_comm;
+
+ return (u64)(unsigned long)(elt_data->comm);
+}
+
+/* Convert a var that points to common_pid.execname to a string */
+static void update_var_execname(struct hist_field *hist_field)
+{
+ hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR |
+ HIST_FIELD_FL_EXECNAME;
+ hist_field->size = MAX_FILTER_STR_VAL;
+ hist_field->is_signed = 0;
+
+ kfree_const(hist_field->type);
+ hist_field->type = "char[]";
+
+ hist_field->fn = hist_field_execname;
+}
+
static int create_var_field(struct hist_trigger_data *hist_data,
unsigned int val_idx,
struct trace_event_file *file,
@@ -3755,6 +3840,9 @@ static int create_var_field(struct hist_trigger_data *hist_data,
ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
+ if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME)
+ update_var_execname(hist_data->fields[val_idx]);
+
if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
@@ -4698,6 +4786,11 @@ static void hist_trigger_print_key(struct seq_file *m,
} else if (key_field->flags & HIST_FIELD_FL_LOG2) {
seq_printf(m, "%s: ~ 2^%-2llu", field_name,
*(u64 *)(key + key_field->offset));
+ } else if (key_field->flags & HIST_FIELD_FL_BUCKET) {
+ unsigned long buckets = key_field->buckets;
+ uval = *(u64 *)(key + key_field->offset);
+ seq_printf(m, "%s: ~ %llu-%llu", field_name,
+ uval, uval + buckets -1);
} else if (key_field->flags & HIST_FIELD_FL_STRING) {
seq_printf(m, "%s: %-50s", field_name,
(char *)(key + key_field->offset));
@@ -5137,6 +5230,8 @@ static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
seq_printf(m, ".%s", flags);
}
}
+ if (hist_field->buckets)
+ seq_printf(m, "=%ld", hist_field->buckets);
}
static int event_hist_trigger_print(struct seq_file *m,
diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index 9315fc03e303..d54094b7a9d7 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -1298,7 +1298,7 @@ static int __create_synth_event(const char *name, const char *raw_fields)
}
ret = register_synth_event(event);
if (!ret)
- dyn_event_add(&event->devent);
+ dyn_event_add(&event->devent, &event->call);
else
free_synth_event(event);
out:
@@ -1369,13 +1369,15 @@ static int destroy_synth_event(struct synth_event *se)
int ret;
if (se->ref)
- ret = -EBUSY;
- else {
- ret = unregister_synth_event(se);
- if (!ret) {
- dyn_event_remove(&se->devent);
- free_synth_event(se);
- }
+ return -EBUSY;
+
+ if (trace_event_dyn_busy(&se->call))
+ return -EBUSY;
+
+ ret = unregister_synth_event(se);
+ if (!ret) {
+ dyn_event_remove(&se->devent);
+ free_synth_event(se);
}
return ret;
@@ -2102,6 +2104,9 @@ static int synth_event_release(struct dyn_event *ev)
if (event->ref)
return -EBUSY;
+ if (trace_event_dyn_busy(&event->call))
+ return -EBUSY;
+
ret = unregister_synth_event(event);
if (ret)
return ret;
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index cf84d0f6583a..3d5c07239a2a 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -124,6 +124,18 @@ static void *trigger_next(struct seq_file *m, void *t, loff_t *pos)
return seq_list_next(t, &event_file->triggers, pos);
}
+static bool check_user_trigger(struct trace_event_file *file)
+{
+ struct event_trigger_data *data;
+
+ list_for_each_entry_rcu(data, &file->triggers, list) {
+ if (data->flags & EVENT_TRIGGER_FL_PROBE)
+ continue;
+ return true;
+ }
+ return false;
+}
+
static void *trigger_start(struct seq_file *m, loff_t *pos)
{
struct trace_event_file *event_file;
@@ -134,7 +146,7 @@ static void *trigger_start(struct seq_file *m, loff_t *pos)
if (unlikely(!event_file))
return ERR_PTR(-ENODEV);
- if (list_empty(&event_file->triggers))
+ if (list_empty(&event_file->triggers) || !check_user_trigger(event_file))
return *pos == 0 ? SHOW_AVAILABLE_TRIGGERS : NULL;
return seq_list_start(&event_file->triggers, *pos);
@@ -1334,7 +1346,7 @@ void event_enable_trigger_free(struct event_trigger_ops *ops,
if (!data->ref) {
/* Remove the SOFT_MODE flag */
trace_event_enable_disable(enable_data->file, 0, 1);
- module_put(enable_data->file->event_call->mod);
+ trace_event_put_ref(enable_data->file->event_call);
trigger_data_free(data);
kfree(enable_data);
}
@@ -1481,7 +1493,7 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
out_reg:
/* Don't let event modules unload while probe registered */
- ret = try_module_get(event_enable_file->event_call->mod);
+ ret = trace_event_try_get_ref(event_enable_file->event_call);
if (!ret) {
ret = -EBUSY;
goto out_free;
@@ -1510,7 +1522,7 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
out_disable:
trace_event_enable_disable(event_enable_file, 0, 1);
out_put:
- module_put(event_enable_file->event_call->mod);
+ trace_event_put_ref(event_enable_file->event_call);
out_free:
if (cmd_ops->set_filter)
cmd_ops->set_filter(NULL, trigger_data, NULL);
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 14f46aae1981..1b83d75eb103 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -325,10 +325,10 @@ static void move_to_next_cpu(void)
if (!cpumask_equal(current_mask, current->cpus_ptr))
goto change_mode;
- get_online_cpus();
+ cpus_read_lock();
cpumask_and(current_mask, cpu_online_mask, tr->tracing_cpumask);
next_cpu = cpumask_next(raw_smp_processor_id(), current_mask);
- put_online_cpus();
+ cpus_read_unlock();
if (next_cpu >= nr_cpu_ids)
next_cpu = cpumask_first(current_mask);
@@ -398,7 +398,7 @@ static void stop_single_kthread(void)
struct hwlat_kthread_data *kdata = get_cpu_data();
struct task_struct *kthread;
- get_online_cpus();
+ cpus_read_lock();
kthread = kdata->kthread;
if (!kthread)
@@ -408,7 +408,7 @@ static void stop_single_kthread(void)
kdata->kthread = NULL;
out_put_cpus:
- put_online_cpus();
+ cpus_read_unlock();
}
@@ -425,14 +425,14 @@ static int start_single_kthread(struct trace_array *tr)
struct task_struct *kthread;
int next_cpu;
- get_online_cpus();
+ cpus_read_lock();
if (kdata->kthread)
goto out_put_cpus;
kthread = kthread_create(kthread_fn, NULL, "hwlatd");
if (IS_ERR(kthread)) {
pr_err(BANNER "could not start sampling thread\n");
- put_online_cpus();
+ cpus_read_unlock();
return -ENOMEM;
}
@@ -452,7 +452,7 @@ static int start_single_kthread(struct trace_array *tr)
wake_up_process(kthread);
out_put_cpus:
- put_online_cpus();
+ cpus_read_unlock();
return 0;
}
@@ -479,10 +479,10 @@ static void stop_per_cpu_kthreads(void)
{
unsigned int cpu;
- get_online_cpus();
+ cpus_read_lock();
for_each_online_cpu(cpu)
stop_cpu_kthread(cpu);
- put_online_cpus();
+ cpus_read_unlock();
}
/*
@@ -515,7 +515,7 @@ static void hwlat_hotplug_workfn(struct work_struct *dummy)
mutex_lock(&trace_types_lock);
mutex_lock(&hwlat_data.lock);
- get_online_cpus();
+ cpus_read_lock();
if (!hwlat_busy || hwlat_data.thread_mode != MODE_PER_CPU)
goto out_unlock;
@@ -526,7 +526,7 @@ static void hwlat_hotplug_workfn(struct work_struct *dummy)
start_cpu_kthread(cpu);
out_unlock:
- put_online_cpus();
+ cpus_read_unlock();
mutex_unlock(&hwlat_data.lock);
mutex_unlock(&trace_types_lock);
}
@@ -582,7 +582,7 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
unsigned int cpu;
int retval;
- get_online_cpus();
+ cpus_read_lock();
/*
* Run only on CPUs in which hwlat is allowed to run.
*/
@@ -596,12 +596,12 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
if (retval)
goto out_error;
}
- put_online_cpus();
+ cpus_read_unlock();
return 0;
out_error:
- put_online_cpus();
+ cpus_read_unlock();
stop_per_cpu_kthreads();
return retval;
}
diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
index 9da76104f7a2..59857a1ee44c 100644
--- a/kernel/trace/trace_kdb.c
+++ b/kernel/trace/trace_kdb.c
@@ -147,11 +147,17 @@ static int kdb_ftdump(int argc, const char **argv)
return 0;
}
+static kdbtab_t ftdump_cmd = {
+ .name = "ftdump",
+ .func = kdb_ftdump,
+ .usage = "[skip_#entries] [cpu]",
+ .help = "Dump ftrace log; -skip dumps last #entries",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+};
+
static __init int kdb_ftrace_register(void)
{
- kdb_register_flags("ftdump", kdb_ftdump, "[skip_#entries] [cpu]",
- "Dump ftrace log; -skip dumps last #entries", 0,
- KDB_ENABLE_ALWAYS_SAFE);
+ kdb_register(&ftdump_cmd);
return 0;
}
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index ea6178cb5e33..3a64ba4bbad6 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -80,10 +80,6 @@ static struct trace_kprobe *to_trace_kprobe(struct dyn_event *ev)
for_each_dyn_event(dpos) \
if (is_trace_kprobe(dpos) && (pos = to_trace_kprobe(dpos)))
-#define SIZEOF_TRACE_KPROBE(n) \
- (offsetof(struct trace_kprobe, tp.args) + \
- (sizeof(struct probe_arg) * (n)))
-
static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk)
{
return tk->rp.handler != NULL;
@@ -265,7 +261,7 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group,
struct trace_kprobe *tk;
int ret = -ENOMEM;
- tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL);
+ tk = kzalloc(struct_size(tk, tp.args, nargs), GFP_KERNEL);
if (!tk)
return ERR_PTR(ret);
@@ -543,6 +539,10 @@ static int unregister_trace_kprobe(struct trace_kprobe *tk)
if (trace_probe_is_enabled(&tk->tp))
return -EBUSY;
+ /* If there's a reference to the dynamic event */
+ if (trace_event_dyn_busy(trace_probe_event_call(&tk->tp)))
+ return -EBUSY;
+
/* Will fail if probe is being used by ftrace or perf */
if (unregister_kprobe_event(tk))
return -EBUSY;
@@ -618,7 +618,7 @@ static int append_trace_kprobe(struct trace_kprobe *tk, struct trace_kprobe *to)
if (ret)
trace_probe_unlink(&tk->tp);
else
- dyn_event_add(&tk->devent);
+ dyn_event_add(&tk->devent, trace_probe_event_call(&tk->tp));
return ret;
}
@@ -647,7 +647,11 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
/* Register new event */
ret = register_kprobe_event(tk);
if (ret) {
- pr_warn("Failed to register probe event(%d)\n", ret);
+ if (ret == -EEXIST) {
+ trace_probe_log_set_index(0);
+ trace_probe_log_err(0, EVENT_EXIST);
+ } else
+ pr_warn("Failed to register probe event(%d)\n", ret);
goto end;
}
@@ -661,7 +665,7 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
if (ret < 0)
unregister_kprobe_event(tk);
else
- dyn_event_add(&tk->devent);
+ dyn_event_add(&tk->devent, trace_probe_event_call(&tk->tp));
end:
mutex_unlock(&event_mutex);
@@ -703,14 +707,6 @@ static struct notifier_block trace_kprobe_module_nb = {
.priority = 1 /* Invoked after kprobe module callback */
};
-/* Convert certain expected symbols into '_' when generating event names */
-static inline void sanitize_event_name(char *name)
-{
- while (*name++ != '\0')
- if (*name == ':' || *name == '.')
- *name = '_';
-}
-
static int __trace_kprobe_create(int argc, const char *argv[])
{
/*
@@ -742,6 +738,7 @@ static int __trace_kprobe_create(int argc, const char *argv[])
bool is_return = false;
char *symbol = NULL, *tmp = NULL;
const char *event = NULL, *group = KPROBE_EVENT_SYSTEM;
+ enum probe_print_type ptype;
int maxactive = 0;
long offset = 0;
void *addr = NULL;
@@ -869,20 +866,14 @@ static int __trace_kprobe_create(int argc, const char *argv[])
/* parse arguments */
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
- tmp = kstrdup(argv[i], GFP_KERNEL);
- if (!tmp) {
- ret = -ENOMEM;
- goto error;
- }
-
trace_probe_log_set_index(i + 2);
- ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
- kfree(tmp);
+ ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], flags);
if (ret)
goto error; /* This can be -ENOMEM */
}
- ret = traceprobe_set_print_fmt(&tk->tp, is_return);
+ ptype = is_return ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
+ ret = traceprobe_set_print_fmt(&tk->tp, ptype);
if (ret < 0)
goto error;
@@ -1330,9 +1321,10 @@ probe_mem_read(void *dest, void *src, size_t size)
/* Note that we don't verify it, since the code does not come from user space */
static int
-process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
+process_fetch_insn(struct fetch_insn *code, void *rec, void *dest,
void *base)
{
+ struct pt_regs *regs = rec;
unsigned long val;
retry:
@@ -1806,6 +1798,7 @@ struct trace_event_call *
create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
bool is_return)
{
+ enum probe_print_type ptype;
struct trace_kprobe *tk;
int ret;
char *event;
@@ -1829,7 +1822,9 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
init_trace_event_call(tk);
- if (traceprobe_set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) {
+ ptype = trace_kprobe_is_return(tk) ?
+ PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
+ if (traceprobe_set_print_fmt(&tk->tp, ptype) < 0) {
ret = -ENOMEM;
goto error;
}
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index b61eefe5ccf5..ce053619f289 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1498,12 +1498,12 @@ static void stop_per_cpu_kthreads(void)
{
int cpu;
- get_online_cpus();
+ cpus_read_lock();
for_each_online_cpu(cpu)
stop_kthread(cpu);
- put_online_cpus();
+ cpus_read_unlock();
}
/*
@@ -1548,10 +1548,10 @@ static int start_kthread(unsigned int cpu)
static int start_per_cpu_kthreads(struct trace_array *tr)
{
struct cpumask *current_mask = &save_cpumask;
- int retval;
+ int retval = 0;
int cpu;
- get_online_cpus();
+ cpus_read_lock();
/*
* Run only on CPUs in which trace and osnoise are allowed to run.
*/
@@ -1568,13 +1568,13 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
retval = start_kthread(cpu);
if (retval) {
stop_per_cpu_kthreads();
- return retval;
+ break;
}
}
- put_online_cpus();
+ cpus_read_unlock();
- return 0;
+ return retval;
}
#ifdef CONFIG_HOTPLUG_CPU
@@ -1590,7 +1590,7 @@ static void osnoise_hotplug_workfn(struct work_struct *dummy)
goto out_unlock_trace;
mutex_lock(&interface_lock);
- get_online_cpus();
+ cpus_read_lock();
if (!cpumask_test_cpu(cpu, &osnoise_cpumask))
goto out_unlock;
@@ -1601,7 +1601,7 @@ static void osnoise_hotplug_workfn(struct work_struct *dummy)
start_kthread(cpu);
out_unlock:
- put_online_cpus();
+ cpus_read_unlock();
mutex_unlock(&interface_lock);
out_unlock_trace:
mutex_unlock(&trace_types_lock);
@@ -1743,11 +1743,11 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
/*
* osnoise_cpumask is read by CPU hotplug operations.
*/
- get_online_cpus();
+ cpus_read_lock();
cpumask_copy(&osnoise_cpumask, osnoise_cpumask_new);
- put_online_cpus();
+ cpus_read_unlock();
mutex_unlock(&interface_lock);
if (running)
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index a0bf446bb034..c2ca40e8595b 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -492,8 +492,13 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
trace_seq_printf(s, "%c%c%c",
irqs_off, need_resched, hardsoft_irq);
- if (entry->preempt_count)
- trace_seq_printf(s, "%x", entry->preempt_count);
+ if (entry->preempt_count & 0xf)
+ trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
+ else
+ trace_seq_putc(s, '.');
+
+ if (entry->preempt_count & 0xf0)
+ trace_seq_printf(s, "%x", entry->preempt_count >> 4);
else
trace_seq_putc(s, '.');
@@ -656,7 +661,7 @@ int trace_print_lat_context(struct trace_iterator *iter)
trace_seq_printf(
s, "%16s %7d %3d %d %08x %08lx ",
comm, entry->pid, iter->cpu, entry->flags,
- entry->preempt_count, iter->idx);
+ entry->preempt_count & 0xf, iter->idx);
} else {
lat_print_generic(s, entry, iter->cpu);
}
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 15413ad7cef2..3ed2a3f37297 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -233,6 +233,9 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
int len;
slash = strchr(event, '/');
+ if (!slash)
+ slash = strchr(event, '.');
+
if (slash) {
if (slash == event) {
trace_probe_log_err(offset, NO_GROUP_NAME);
@@ -316,6 +319,13 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
code->op = FETCH_OP_ARG;
code->param = (unsigned int)param - 1;
#endif
+ } else if (flags & TPARG_FL_TPOINT) {
+ if (code->data)
+ return -EFAULT;
+ code->data = kstrdup(arg, GFP_KERNEL);
+ if (!code->data)
+ return -ENOMEM;
+ code->op = FETCH_OP_TP_ARG;
} else
goto inval_var;
@@ -540,26 +550,34 @@ static int __parse_bitfield_probe_arg(const char *bf,
}
/* String length checking wrapper */
-static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
+static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
struct probe_arg *parg, unsigned int flags, int offset)
{
struct fetch_insn *code, *scode, *tmp = NULL;
char *t, *t2, *t3;
+ char *arg;
int ret, len;
+ arg = kstrdup(argv, GFP_KERNEL);
+ if (!arg)
+ return -ENOMEM;
+
+ ret = -EINVAL;
len = strlen(arg);
if (len > MAX_ARGSTR_LEN) {
trace_probe_log_err(offset, ARG_TOO_LONG);
- return -EINVAL;
+ goto out;
} else if (len == 0) {
trace_probe_log_err(offset, NO_ARG_BODY);
- return -EINVAL;
+ goto out;
}
+ ret = -ENOMEM;
parg->comm = kstrdup(arg, GFP_KERNEL);
if (!parg->comm)
- return -ENOMEM;
+ goto out;
+ ret = -EINVAL;
t = strchr(arg, ':');
if (t) {
*t = '\0';
@@ -571,22 +589,22 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
offset += t2 + strlen(t2) - arg;
trace_probe_log_err(offset,
ARRAY_NO_CLOSE);
- return -EINVAL;
+ goto out;
} else if (t3[1] != '\0') {
trace_probe_log_err(offset + t3 + 1 - arg,
BAD_ARRAY_SUFFIX);
- return -EINVAL;
+ goto out;
}
*t3 = '\0';
if (kstrtouint(t2, 0, &parg->count) || !parg->count) {
trace_probe_log_err(offset + t2 - arg,
BAD_ARRAY_NUM);
- return -EINVAL;
+ goto out;
}
if (parg->count > MAX_ARRAY_LEN) {
trace_probe_log_err(offset + t2 - arg,
ARRAY_TOO_BIG);
- return -EINVAL;
+ goto out;
}
}
}
@@ -598,29 +616,30 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
if (strcmp(arg, "$comm") == 0 || strncmp(arg, "\\\"", 2) == 0) {
/* The type of $comm must be "string", and not an array. */
if (parg->count || (t && strcmp(t, "string")))
- return -EINVAL;
+ goto out;
parg->type = find_fetch_type("string");
} else
parg->type = find_fetch_type(t);
if (!parg->type) {
trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
- return -EINVAL;
+ goto out;
}
parg->offset = *size;
*size += parg->type->size * (parg->count ?: 1);
+ ret = -ENOMEM;
if (parg->count) {
len = strlen(parg->type->fmttype) + 6;
parg->fmt = kmalloc(len, GFP_KERNEL);
if (!parg->fmt)
- return -ENOMEM;
+ goto out;
snprintf(parg->fmt, len, "%s[%d]", parg->type->fmttype,
parg->count);
}
code = tmp = kcalloc(FETCH_INSN_MAX, sizeof(*code), GFP_KERNEL);
if (!code)
- return -ENOMEM;
+ goto out;
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
@@ -628,19 +647,20 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
if (ret)
goto fail;
+ ret = -EINVAL;
/* Store operation */
if (!strcmp(parg->type->name, "string") ||
!strcmp(parg->type->name, "ustring")) {
if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF &&
code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM &&
- code->op != FETCH_OP_DATA) {
+ code->op != FETCH_OP_DATA && code->op != FETCH_OP_TP_ARG) {
trace_probe_log_err(offset + (t ? (t - arg) : 0),
BAD_STRING);
- ret = -EINVAL;
goto fail;
}
if ((code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM ||
- code->op == FETCH_OP_DATA) || parg->count) {
+ code->op == FETCH_OP_DATA) || code->op == FETCH_OP_TP_ARG ||
+ parg->count) {
/*
* IMM, DATA and COMM is pointing actual address, those
* must be kept, and if parg->count != 0, this is an
@@ -650,7 +670,6 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code++;
if (code->op != FETCH_OP_NOP) {
trace_probe_log_err(offset, TOO_MANY_OPS);
- ret = -EINVAL;
goto fail;
}
}
@@ -672,7 +691,6 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code++;
if (code->op != FETCH_OP_NOP) {
trace_probe_log_err(offset, TOO_MANY_OPS);
- ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_ST_RAW;
@@ -687,6 +705,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
goto fail;
}
}
+ ret = -EINVAL;
/* Loop(Array) operation */
if (parg->count) {
if (scode->op != FETCH_OP_ST_MEM &&
@@ -694,13 +713,11 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
scode->op != FETCH_OP_ST_USTRING) {
trace_probe_log_err(offset + (t ? (t - arg) : 0),
BAD_STRING);
- ret = -EINVAL;
goto fail;
}
code++;
if (code->op != FETCH_OP_NOP) {
trace_probe_log_err(offset, TOO_MANY_OPS);
- ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_LP_ARRAY;
@@ -709,6 +726,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code++;
code->op = FETCH_OP_END;
+ ret = 0;
/* Shrink down the code buffer */
parg->code = kcalloc(code - tmp + 1, sizeof(*code), GFP_KERNEL);
if (!parg->code)
@@ -724,6 +742,8 @@ fail:
kfree(code->data);
}
kfree(tmp);
+out:
+ kfree(arg);
return ret;
}
@@ -745,11 +765,11 @@ static int traceprobe_conflict_field_name(const char *name,
return 0;
}
-int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
+int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, const char *arg,
unsigned int flags)
{
struct probe_arg *parg = &tp->args[i];
- char *body;
+ const char *body;
/* Increment count for freeing args in error case */
tp->nr_args++;
@@ -839,19 +859,29 @@ int traceprobe_update_arg(struct probe_arg *arg)
/* When len=0, we just calculate the needed length */
#define LEN_OR_ZERO (len ? len - pos : 0)
static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
- bool is_return)
+ enum probe_print_type ptype)
{
struct probe_arg *parg;
int i, j;
int pos = 0;
const char *fmt, *arg;
- if (!is_return) {
+ switch (ptype) {
+ case PROBE_PRINT_NORMAL:
fmt = "(%lx)";
arg = "REC->" FIELD_STRING_IP;
- } else {
+ break;
+ case PROBE_PRINT_RETURN:
fmt = "(%lx <- %lx)";
arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
+ break;
+ case PROBE_PRINT_EVENT:
+ fmt = "(%u)";
+ arg = "REC->" FIELD_STRING_TYPE;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return 0;
}
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
@@ -900,20 +930,20 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
}
#undef LEN_OR_ZERO
-int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return)
+int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype)
{
struct trace_event_call *call = trace_probe_event_call(tp);
int len;
char *print_fmt;
/* First: called with 0 length to calculate the needed length */
- len = __set_print_fmt(tp, NULL, 0, is_return);
+ len = __set_print_fmt(tp, NULL, 0, ptype);
print_fmt = kmalloc(len + 1, GFP_KERNEL);
if (!print_fmt)
return -ENOMEM;
/* Second: actually write the @print_fmt */
- __set_print_fmt(tp, print_fmt, len + 1, is_return);
+ __set_print_fmt(tp, print_fmt, len + 1, ptype);
call->print_fmt = print_fmt;
return 0;
@@ -1029,11 +1059,36 @@ error:
return ret;
}
+static struct trace_event_call *
+find_trace_event_call(const char *system, const char *event_name)
+{
+ struct trace_event_call *tp_event;
+ const char *name;
+
+ list_for_each_entry(tp_event, &ftrace_events, list) {
+ if (!tp_event->class->system ||
+ strcmp(system, tp_event->class->system))
+ continue;
+ name = trace_event_name(tp_event);
+ if (!name || strcmp(event_name, name))
+ continue;
+ return tp_event;
+ }
+
+ return NULL;
+}
+
int trace_probe_register_event_call(struct trace_probe *tp)
{
struct trace_event_call *call = trace_probe_event_call(tp);
int ret;
+ lockdep_assert_held(&event_mutex);
+
+ if (find_trace_event_call(trace_probe_group_name(tp),
+ trace_probe_name(tp)))
+ return -EEXIST;
+
ret = register_trace_event(&call->event);
if (!ret)
return -ENODEV;
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 227d518e5ba5..99e7a5df025e 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -38,6 +38,7 @@
#define FIELD_STRING_IP "__probe_ip"
#define FIELD_STRING_RETIP "__probe_ret_ip"
#define FIELD_STRING_FUNC "__probe_func"
+#define FIELD_STRING_TYPE "__probe_type"
#undef DEFINE_FIELD
#define DEFINE_FIELD(type, item, name, is_signed) \
@@ -102,6 +103,7 @@ enum fetch_op {
FETCH_OP_MOD_BF, /* Bitfield: .basesize, .lshift, .rshift */
// Stage 5 (loop) op
FETCH_OP_LP_ARRAY, /* Array: .param = loop count */
+ FETCH_OP_TP_ARG, /* Trace Point argument */
FETCH_OP_END,
FETCH_NOP_SYMBOL, /* Unresolved Symbol holder */
};
@@ -351,10 +353,11 @@ int trace_probe_create(const char *raw_command, int (*createfn)(int, const char
#define TPARG_FL_RETURN BIT(0)
#define TPARG_FL_KERNEL BIT(1)
#define TPARG_FL_FENTRY BIT(2)
-#define TPARG_FL_MASK GENMASK(2, 0)
+#define TPARG_FL_TPOINT BIT(3)
+#define TPARG_FL_MASK GENMASK(3, 0)
extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
- char *arg, unsigned int flags);
+ const char *argv, unsigned int flags);
extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
@@ -363,7 +366,13 @@ extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
char *buf, int offset);
-extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
+enum probe_print_type {
+ PROBE_PRINT_NORMAL,
+ PROBE_PRINT_RETURN,
+ PROBE_PRINT_EVENT,
+};
+
+extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype);
#ifdef CONFIG_PERF_EVENTS
extern struct trace_event_call *
@@ -399,6 +408,7 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
C(NO_EVENT_NAME, "Event name is not specified"), \
C(EVENT_TOO_LONG, "Event name is too long"), \
C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \
+ C(EVENT_EXIST, "Given group/event name is already used by another event"), \
C(RETVAL_ON_PROBE, "$retval is not available on probe"), \
C(BAD_STACK_NUM, "Invalid stack number"), \
C(BAD_ARG_NUM, "Invalid argument number"), \
diff --git a/kernel/trace/trace_probe_tmpl.h b/kernel/trace/trace_probe_tmpl.h
index f003c5d02a3a..b3bdb8ddb862 100644
--- a/kernel/trace/trace_probe_tmpl.h
+++ b/kernel/trace/trace_probe_tmpl.h
@@ -54,7 +54,7 @@ fetch_apply_bitfield(struct fetch_insn *code, void *buf)
* If dest is NULL, don't store result and return required dynamic data size.
*/
static int
-process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs,
+process_fetch_insn(struct fetch_insn *code, void *rec,
void *dest, void *base);
static nokprobe_inline int fetch_store_strlen(unsigned long addr);
static nokprobe_inline int
@@ -188,7 +188,7 @@ __get_data_size(struct trace_probe *tp, struct pt_regs *regs)
/* Store the value of each argument */
static nokprobe_inline void
-store_trace_args(void *data, struct trace_probe *tp, struct pt_regs *regs,
+store_trace_args(void *data, struct trace_probe *tp, void *rec,
int header_size, int maxlen)
{
struct probe_arg *arg;
@@ -203,7 +203,7 @@ store_trace_args(void *data, struct trace_probe *tp, struct pt_regs *regs,
/* Point the dynamic data area if needed */
if (unlikely(arg->dynamic))
*dl = make_data_loc(maxlen, dyndata - base);
- ret = process_fetch_insn(arg->code, regs, dl, base);
+ ret = process_fetch_insn(arg->code, rec, dl, base);
if (unlikely(ret < 0 && arg->dynamic)) {
*dl = make_data_loc(0, dyndata - base);
} else {
diff --git a/kernel/trace/trace_synth.h b/kernel/trace/trace_synth.h
index 4007fe95cf42..b29595fe3ac5 100644
--- a/kernel/trace/trace_synth.h
+++ b/kernel/trace/trace_synth.h
@@ -5,7 +5,7 @@
#include "trace_dynevent.h"
#define SYNTH_SYSTEM "synthetic"
-#define SYNTH_FIELDS_MAX 32
+#define SYNTH_FIELDS_MAX 64
#define STR_VAR_LEN_MAX MAX_FILTER_STR_VAL /* must be multiple of sizeof(u64) */
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 9b50869a5ddb..225ce569bf8f 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -83,10 +83,6 @@ static struct trace_uprobe *to_trace_uprobe(struct dyn_event *ev)
for_each_dyn_event(dpos) \
if (is_trace_uprobe(dpos) && (pos = to_trace_uprobe(dpos)))
-#define SIZEOF_TRACE_UPROBE(n) \
- (offsetof(struct trace_uprobe, tp.args) + \
- (sizeof(struct probe_arg) * (n)))
-
static int register_uprobe_event(struct trace_uprobe *tu);
static int unregister_uprobe_event(struct trace_uprobe *tu);
@@ -217,9 +213,10 @@ static unsigned long translate_user_vaddr(unsigned long file_offset)
/* Note that we don't verify it, since the code does not come from user space */
static int
-process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
+process_fetch_insn(struct fetch_insn *code, void *rec, void *dest,
void *base)
{
+ struct pt_regs *regs = rec;
unsigned long val;
/* 1st stage: get value from context */
@@ -340,7 +337,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
struct trace_uprobe *tu;
int ret;
- tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
+ tu = kzalloc(struct_size(tu, tp.args, nargs), GFP_KERNEL);
if (!tu)
return ERR_PTR(-ENOMEM);
@@ -393,6 +390,10 @@ static int unregister_trace_uprobe(struct trace_uprobe *tu)
if (trace_probe_has_sibling(&tu->tp))
goto unreg;
+ /* If there's a reference to the dynamic event */
+ if (trace_event_dyn_busy(trace_probe_event_call(&tu->tp)))
+ return -EBUSY;
+
ret = unregister_uprobe_event(tu);
if (ret)
return ret;
@@ -455,7 +456,7 @@ static int append_trace_uprobe(struct trace_uprobe *tu, struct trace_uprobe *to)
/* Append to existing event */
ret = trace_probe_append(&tu->tp, &to->tp);
if (!ret)
- dyn_event_add(&tu->devent);
+ dyn_event_add(&tu->devent, trace_probe_event_call(&tu->tp));
return ret;
}
@@ -514,11 +515,15 @@ static int register_trace_uprobe(struct trace_uprobe *tu)
ret = register_uprobe_event(tu);
if (ret) {
- pr_warn("Failed to register probe event(%d)\n", ret);
+ if (ret == -EEXIST) {
+ trace_probe_log_set_index(0);
+ trace_probe_log_err(0, EVENT_EXIST);
+ } else
+ pr_warn("Failed to register probe event(%d)\n", ret);
goto end;
}
- dyn_event_add(&tu->devent);
+ dyn_event_add(&tu->devent, trace_probe_event_call(&tu->tp));
end:
mutex_unlock(&event_mutex);
@@ -536,6 +541,7 @@ static int __trace_uprobe_create(int argc, const char **argv)
const char *event = NULL, *group = UPROBE_EVENT_SYSTEM;
char *arg, *filename, *rctr, *rctr_end, *tmp;
char buf[MAX_EVENT_NAME_LEN];
+ enum probe_print_type ptype;
struct path path;
unsigned long offset, ref_ctr_offset;
bool is_return = false;
@@ -680,21 +686,15 @@ static int __trace_uprobe_create(int argc, const char **argv)
/* parse arguments */
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
- tmp = kstrdup(argv[i], GFP_KERNEL);
- if (!tmp) {
- ret = -ENOMEM;
- goto error;
- }
-
trace_probe_log_set_index(i + 2);
- ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
+ ret = traceprobe_parse_probe_arg(&tu->tp, i, argv[i],
is_return ? TPARG_FL_RETURN : 0);
- kfree(tmp);
if (ret)
goto error;
}
- ret = traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu));
+ ptype = is_ret_probe(tu) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
+ ret = traceprobe_set_print_fmt(&tu->tp, ptype);
if (ret < 0)
goto error;
@@ -1585,6 +1585,7 @@ struct trace_event_call *
create_local_trace_uprobe(char *name, unsigned long offs,
unsigned long ref_ctr_offset, bool is_return)
{
+ enum probe_print_type ptype;
struct trace_uprobe *tu;
struct path path;
int ret;
@@ -1619,7 +1620,8 @@ create_local_trace_uprobe(char *name, unsigned long offs,
tu->filename = kstrdup(name, GFP_KERNEL);
init_trace_event_call(tu);
- if (traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0) {
+ ptype = is_ret_probe(tu) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
+ if (traceprobe_set_print_fmt(&tu->tp, ptype) < 0) {
ret = -ENOMEM;
goto error;
}
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index efd14c79fab4..64ea283f2f86 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -577,7 +577,7 @@ bool trace_module_has_bad_taint(struct module *mod)
static BLOCKING_NOTIFIER_HEAD(tracepoint_notify_list);
/**
- * register_tracepoint_notifier - register tracepoint coming/going notifier
+ * register_tracepoint_module_notifier - register tracepoint coming/going notifier
* @nb: notifier block
*
* Notifiers registered with this function are called on module
@@ -603,7 +603,7 @@ end:
EXPORT_SYMBOL_GPL(register_tracepoint_module_notifier);
/**
- * unregister_tracepoint_notifier - unregister tracepoint coming/going notifier
+ * unregister_tracepoint_module_notifier - unregister tracepoint coming/going notifier
* @nb: notifier block
*
* The notifier block callback should expect a "struct tp_module" data
diff --git a/kernel/user.c b/kernel/user.c
index c82399c1618a..e2cf8c22b539 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -129,6 +129,22 @@ static struct user_struct *uid_hash_find(kuid_t uid, struct hlist_head *hashent)
return NULL;
}
+static int user_epoll_alloc(struct user_struct *up)
+{
+#ifdef CONFIG_EPOLL
+ return percpu_counter_init(&up->epoll_watches, 0, GFP_KERNEL);
+#else
+ return 0;
+#endif
+}
+
+static void user_epoll_free(struct user_struct *up)
+{
+#ifdef CONFIG_EPOLL
+ percpu_counter_destroy(&up->epoll_watches);
+#endif
+}
+
/* IRQs are disabled and uidhash_lock is held upon function entry.
* IRQ state (as stored in flags) is restored and uidhash_lock released
* upon function exit.
@@ -138,6 +154,7 @@ static void free_user(struct user_struct *up, unsigned long flags)
{
uid_hash_remove(up);
spin_unlock_irqrestore(&uidhash_lock, flags);
+ user_epoll_free(up);
kmem_cache_free(uid_cachep, up);
}
@@ -185,6 +202,10 @@ struct user_struct *alloc_uid(kuid_t uid)
new->uid = uid;
refcount_set(&new->__count, 1);
+ if (user_epoll_alloc(new)) {
+ kmem_cache_free(uid_cachep, new);
+ return NULL;
+ }
ratelimit_state_init(&new->ratelimit, HZ, 100);
ratelimit_set_flags(&new->ratelimit, RATELIMIT_MSG_ON_RELEASE);
@@ -195,6 +216,7 @@ struct user_struct *alloc_uid(kuid_t uid)
spin_lock_irq(&uidhash_lock);
up = uid_hash_find(uid, hashent);
if (up) {
+ user_epoll_free(new);
kmem_cache_free(uid_cachep, new);
} else {
uid_hash_insert(new, hashent);
@@ -216,6 +238,9 @@ static int __init uid_cache_init(void)
for(n = 0; n < UIDHASH_SZ; ++n)
INIT_HLIST_HEAD(uidhash_table + n);
+ if (user_epoll_alloc(&root_user))
+ panic("root_user epoll percpu counter alloc failed");
+
/* Insert the root user immediately (init already runs as root) */
spin_lock_irq(&uidhash_lock);
uid_hash_insert(&root_user, uidhashentry(GLOBAL_ROOT_UID));
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index ef82d401dde8..6b2e3ca7ee99 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -1385,7 +1385,7 @@ const struct proc_ns_operations userns_operations = {
static __init int user_namespaces_init(void)
{
- user_ns_cachep = KMEM_CACHE(user_namespace, SLAB_PANIC);
+ user_ns_cachep = KMEM_CACHE(user_namespace, SLAB_PANIC | SLAB_ACCOUNT);
return 0;
}
subsys_initcall(user_namespaces_init);