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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 14:23:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 14:23:52 -0800
commite71d5126e77c68b7ed1fad275fdc8825e9597448 (patch)
tree038f23568881d65cb269c9c4b92e65a2d7131456 /arch
parentc3e9c04b89059a4c93c792da883ca284de182da5 (diff)
parentab35727eb879ccc9487c6df0a3796be124ed39d3 (diff)
downloadlinux-e71d5126e77c68b7ed1fad275fdc8825e9597448.tar.bz2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull second round of s390 updates from Martin Schwidefsky: - rework of the vdso code to avoid the use of the access register mode - use perf AUX buffers for the transport of diagnostic sample data - add perf_regs and user stack dump support - enable perf call graphs for user space programs - add perf register support for floating-point registers - all remaining s390 related timer_setup conversions - bug fixes and cleanups * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (30 commits) s390: remove unused parameter from Makefile zfcp: purely mechanical update using timer API, plus blank lines s390/scsi: Convert timers to use timer_setup() s390/cpum_sf: correctly set the PID and TID in perf samples s390/cpum_sf: load program parameter at sampler enablement s390/perf: add perf register support for floating-point registers s390/perf: extend perf_regs support to include floating-point registers s390/perf: define common DWARF register string table s390/perf: add support for perf_regs and libdw s390/perf: add perf_regs support and user stack dump s390/cpum_sf: do not register PMU if no sampling mode is authorized s390/cpumf: remove raw event support in basic-only sampling mode s390/perf: add callback to perf to enable using AUX buffer s390/cpumf: enable using AUX buffer s390/cpumf: introduce AUX buffer for dump diagnostic sample data s390/disassembler: increase show_code buffer size s390: Remove CONFIG_HARDENED_USERCOPY s390: enable CPU alternatives unconditionally s390/nmi: remove unused code s390/mm: remove unused code ...
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/Kconfig19
-rw-r--r--arch/s390/configs/default_defconfig5
-rw-r--r--arch/s390/configs/gcov_defconfig4
-rw-r--r--arch/s390/configs/performance_defconfig4
-rw-r--r--arch/s390/include/asm/alternative.h20
-rw-r--r--arch/s390/include/asm/cpu_mf.h8
-rw-r--r--arch/s390/include/asm/futex.h9
-rw-r--r--arch/s390/include/asm/lowcore.h37
-rw-r--r--arch/s390/include/asm/mmu_context.h36
-rw-r--r--arch/s390/include/asm/perf_event.h17
-rw-r--r--arch/s390/include/asm/processor.h6
-rw-r--r--arch/s390/include/asm/ptrace.h2
-rw-r--r--arch/s390/include/asm/setup.h2
-rw-r--r--arch/s390/include/asm/uaccess.h29
-rw-r--r--arch/s390/include/asm/vdso.h1
-rw-r--r--arch/s390/include/uapi/asm/perf_regs.h43
-rw-r--r--arch/s390/kernel/Makefile5
-rw-r--r--arch/s390/kernel/asm-offsets.c2
-rw-r--r--arch/s390/kernel/dis.c4
-rw-r--r--arch/s390/kernel/entry.S33
-rw-r--r--arch/s390/kernel/head64.S2
-rw-r--r--arch/s390/kernel/module.c15
-rw-r--r--arch/s390/kernel/nmi.c2
-rw-r--r--arch/s390/kernel/perf_cpum_sf.c768
-rw-r--r--arch/s390/kernel/perf_regs.c70
-rw-r--r--arch/s390/kernel/vdso.c44
-rw-r--r--arch/s390/kernel/vdso32/getcpu.S16
-rw-r--r--arch/s390/kernel/vdso64/clock_gettime.S19
-rw-r--r--arch/s390/kernel/vdso64/getcpu.S15
-rw-r--r--arch/s390/lib/spinlock.c7
-rw-r--r--arch/s390/lib/uaccess.c90
-rw-r--r--arch/s390/mm/fault.c110
-rw-r--r--arch/s390/mm/gmap.c9
-rw-r--r--arch/s390/mm/init.c1
-rw-r--r--arch/s390/mm/pgalloc.c4
-rw-r--r--arch/s390/tools/Makefile2
36 files changed, 985 insertions, 475 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 863a62a6de3c..829c67986db7 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -148,6 +148,7 @@ config S390
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER
select HAVE_FUTEX_CMPXCHG if FUTEX
+ select HAVE_GCC_PLUGINS
select HAVE_KERNEL_BZIP2
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZ4
@@ -158,6 +159,8 @@ config S390
select HAVE_KRETPROBES
select HAVE_KVM
select HAVE_LIVEPATCH
+ select HAVE_PERF_REGS
+ select HAVE_PERF_USER_STACK_DUMP
select HAVE_MEMBLOCK
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_MEMBLOCK_PHYS_MAP
@@ -538,22 +541,6 @@ config ARCH_RANDOM
If unsure, say Y.
-config ALTERNATIVES
- def_bool y
- prompt "Patch optimized instructions for running CPU type"
- help
- When enabled the kernel code is compiled with additional
- alternative instructions blocks optimized for newer CPU types.
- These alternative instructions blocks are patched at kernel boot
- time when running CPU supports them. This mechanism is used to
- optimize some critical code paths (i.e. spinlocks) for newer CPUs
- even if kernel is build to support older machine generations.
-
- This mechanism could be disabled by appending "noaltinstr"
- option to the kernel command line.
-
- If unsure, say Y.
-
endmenu
menu "Memory setup"
diff --git a/arch/s390/configs/default_defconfig b/arch/s390/configs/default_defconfig
index 84eccc88c065..5af8458951cf 100644
--- a/arch/s390/configs/default_defconfig
+++ b/arch/s390/configs/default_defconfig
@@ -629,6 +629,7 @@ CONFIG_STACK_TRACER=y
CONFIG_BLK_DEV_IO_TRACE=y
CONFIG_FUNCTION_PROFILER=y
CONFIG_HIST_TRIGGERS=y
+CONFIG_DMA_API_DEBUG=y
CONFIG_LKDTM=m
CONFIG_TEST_LIST_SORT=y
CONFIG_TEST_SORT=y
@@ -637,14 +638,12 @@ CONFIG_RBTREE_TEST=y
CONFIG_INTERVAL_TREE_TEST=m
CONFIG_PERCPU_TEST=m
CONFIG_ATOMIC64_SELFTEST=y
-CONFIG_DMA_API_DEBUG=y
CONFIG_TEST_BPF=m
CONFIG_BUG_ON_DATA_CORRUPTION=y
CONFIG_S390_PTDUMP=y
CONFIG_ENCRYPTED_KEYS=m
CONFIG_SECURITY=y
CONFIG_SECURITY_NETWORK=y
-CONFIG_HARDENED_USERCOPY=y
CONFIG_FORTIFY_SOURCE=y
CONFIG_SECURITY_SELINUX=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y
@@ -660,13 +659,11 @@ CONFIG_CRYPTO_PCRYPT=m
CONFIG_CRYPTO_CRYPTD=m
CONFIG_CRYPTO_MCRYPTD=m
CONFIG_CRYPTO_TEST=m
-CONFIG_CRYPTO_CCM=m
CONFIG_CRYPTO_GCM=m
CONFIG_CRYPTO_CHACHA20POLY1305=m
CONFIG_CRYPTO_LRW=m
CONFIG_CRYPTO_PCBC=m
CONFIG_CRYPTO_KEYWRAP=m
-CONFIG_CRYPTO_CMAC=m
CONFIG_CRYPTO_XCBC=m
CONFIG_CRYPTO_VMAC=m
CONFIG_CRYPTO_CRC32=m
diff --git a/arch/s390/configs/gcov_defconfig b/arch/s390/configs/gcov_defconfig
index f7202358e6d7..d52eafe57ae8 100644
--- a/arch/s390/configs/gcov_defconfig
+++ b/arch/s390/configs/gcov_defconfig
@@ -587,7 +587,6 @@ CONFIG_BIG_KEYS=y
CONFIG_ENCRYPTED_KEYS=m
CONFIG_SECURITY=y
CONFIG_SECURITY_NETWORK=y
-CONFIG_HARDENED_USERCOPY=y
CONFIG_SECURITY_SELINUX=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y
CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE=0
@@ -605,13 +604,10 @@ CONFIG_CRYPTO_PCRYPT=m
CONFIG_CRYPTO_CRYPTD=m
CONFIG_CRYPTO_MCRYPTD=m
CONFIG_CRYPTO_TEST=m
-CONFIG_CRYPTO_CCM=m
-CONFIG_CRYPTO_GCM=m
CONFIG_CRYPTO_CHACHA20POLY1305=m
CONFIG_CRYPTO_LRW=m
CONFIG_CRYPTO_PCBC=m
CONFIG_CRYPTO_KEYWRAP=m
-CONFIG_CRYPTO_CMAC=m
CONFIG_CRYPTO_XCBC=m
CONFIG_CRYPTO_VMAC=m
CONFIG_CRYPTO_CRC32=m
diff --git a/arch/s390/configs/performance_defconfig b/arch/s390/configs/performance_defconfig
index 03100fe74ea8..20ed149e1137 100644
--- a/arch/s390/configs/performance_defconfig
+++ b/arch/s390/configs/performance_defconfig
@@ -585,7 +585,6 @@ CONFIG_BIG_KEYS=y
CONFIG_ENCRYPTED_KEYS=m
CONFIG_SECURITY=y
CONFIG_SECURITY_NETWORK=y
-CONFIG_HARDENED_USERCOPY=y
CONFIG_SECURITY_SELINUX=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y
CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE=0
@@ -603,13 +602,10 @@ CONFIG_CRYPTO_PCRYPT=m
CONFIG_CRYPTO_CRYPTD=m
CONFIG_CRYPTO_MCRYPTD=m
CONFIG_CRYPTO_TEST=m
-CONFIG_CRYPTO_CCM=m
-CONFIG_CRYPTO_GCM=m
CONFIG_CRYPTO_CHACHA20POLY1305=m
CONFIG_CRYPTO_LRW=m
CONFIG_CRYPTO_PCBC=m
CONFIG_CRYPTO_KEYWRAP=m
-CONFIG_CRYPTO_CMAC=m
CONFIG_CRYPTO_XCBC=m
CONFIG_CRYPTO_VMAC=m
CONFIG_CRYPTO_CRC32=m
diff --git a/arch/s390/include/asm/alternative.h b/arch/s390/include/asm/alternative.h
index 6c268f6a51d3..a72002056b54 100644
--- a/arch/s390/include/asm/alternative.h
+++ b/arch/s390/include/asm/alternative.h
@@ -15,14 +15,9 @@ struct alt_instr {
u8 replacementlen; /* length of new instruction */
} __packed;
-#ifdef CONFIG_ALTERNATIVES
-extern void apply_alternative_instructions(void);
-extern void apply_alternatives(struct alt_instr *start, struct alt_instr *end);
-#else
-static inline void apply_alternative_instructions(void) {};
-static inline void apply_alternatives(struct alt_instr *start,
- struct alt_instr *end) {};
-#endif
+void apply_alternative_instructions(void);
+void apply_alternatives(struct alt_instr *start, struct alt_instr *end);
+
/*
* |661: |662: |6620 |663:
* +-----------+---------------------+
@@ -109,7 +104,6 @@ static inline void apply_alternatives(struct alt_instr *start,
b_altinstr(num)":\n\t" altinstr "\n" e_altinstr(num) ":\n" \
INSTR_LEN_SANITY_CHECK(altinstr_len(num))
-#ifdef CONFIG_ALTERNATIVES
/* alternative assembly primitive: */
#define ALTERNATIVE(oldinstr, altinstr, facility) \
".pushsection .altinstr_replacement, \"ax\"\n" \
@@ -130,14 +124,6 @@ static inline void apply_alternatives(struct alt_instr *start,
ALTINSTR_ENTRY(facility1, 1) \
ALTINSTR_ENTRY(facility2, 2) \
".popsection\n"
-#else
-/* Alternative instructions are disabled, let's put just oldinstr in */
-#define ALTERNATIVE(oldinstr, altinstr, facility) \
- oldinstr "\n"
-
-#define ALTERNATIVE_2(oldinstr, altinstr1, facility1, altinstr2, facility2) \
- oldinstr "\n"
-#endif
/*
* Alternative instructions for different CPU types or capabilities.
diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h
index 05480e4cc5ca..792cda339af1 100644
--- a/arch/s390/include/asm/cpu_mf.h
+++ b/arch/s390/include/asm/cpu_mf.h
@@ -144,6 +144,12 @@ struct hws_trailer_entry {
unsigned long long progusage2; /* */
} __packed;
+/* Load program parameter */
+static inline void lpp(void *pp)
+{
+ asm volatile(".insn s,0xb2800000,0(%0)\n":: "a" (pp) : "memory");
+}
+
/* Query counter information */
static inline int qctri(struct cpumf_ctr_info *info)
{
@@ -167,7 +173,7 @@ static inline int lcctl(u64 ctl)
" .insn s,0xb2840000,%1\n"
" ipm %0\n"
" srl %0,28\n"
- : "=d" (cc) : "m" (ctl) : "cc");
+ : "=d" (cc) : "Q" (ctl) : "cc");
return cc;
}
diff --git a/arch/s390/include/asm/futex.h b/arch/s390/include/asm/futex.h
index 9b5a3469fed9..5e97a4353147 100644
--- a/arch/s390/include/asm/futex.h
+++ b/arch/s390/include/asm/futex.h
@@ -26,9 +26,9 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
u32 __user *uaddr)
{
int oldval = 0, newval, ret;
+ mm_segment_t old_fs;
- load_kernel_asce();
-
+ old_fs = enable_sacf_uaccess();
pagefault_disable();
switch (op) {
case FUTEX_OP_SET:
@@ -55,6 +55,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
ret = -ENOSYS;
}
pagefault_enable();
+ disable_sacf_uaccess(old_fs);
if (!ret)
*oval = oldval;
@@ -65,9 +66,10 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
+ mm_segment_t old_fs;
int ret;
- load_kernel_asce();
+ old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
"0: cs %1,%4,0(%5)\n"
@@ -77,6 +79,7 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
: "cc", "memory");
+ disable_sacf_uaccess(old_fs);
*uval = oldval;
return ret;
}
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 9eb36a1592c7..ec6592e8ba36 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -115,33 +115,28 @@ struct lowcore {
/* Address space pointer. */
__u64 kernel_asce; /* 0x0378 */
__u64 user_asce; /* 0x0380 */
+ __u64 vdso_asce; /* 0x0388 */
/*
* The lpp and current_pid fields form a
* 64-bit value that is set as program
* parameter with the LPP instruction.
*/
- __u32 lpp; /* 0x0388 */
- __u32 current_pid; /* 0x038c */
+ __u32 lpp; /* 0x0390 */
+ __u32 current_pid; /* 0x0394 */
/* SMP info area */
- __u32 cpu_nr; /* 0x0390 */
- __u32 softirq_pending; /* 0x0394 */
- __u64 percpu_offset; /* 0x0398 */
- __u64 vdso_per_cpu_data; /* 0x03a0 */
- __u64 machine_flags; /* 0x03a8 */
- __u32 preempt_count; /* 0x03b0 */
- __u8 pad_0x03b4[0x03b8-0x03b4]; /* 0x03b4 */
- __u64 gmap; /* 0x03b8 */
- __u32 spinlock_lockval; /* 0x03c0 */
- __u32 spinlock_index; /* 0x03c4 */
- __u32 fpu_flags; /* 0x03c8 */
- __u8 pad_0x03cc[0x0400-0x03cc]; /* 0x03cc */
-
- /* Per cpu primary space access list */
- __u32 paste[16]; /* 0x0400 */
-
- __u8 pad_0x04c0[0x0e00-0x0440]; /* 0x0440 */
+ __u32 cpu_nr; /* 0x0398 */
+ __u32 softirq_pending; /* 0x039c */
+ __u32 preempt_count; /* 0x03a0 */
+ __u32 spinlock_lockval; /* 0x03a4 */
+ __u32 spinlock_index; /* 0x03a8 */
+ __u32 fpu_flags; /* 0x03ac */
+ __u64 percpu_offset; /* 0x03b0 */
+ __u64 vdso_per_cpu_data; /* 0x03b8 */
+ __u64 machine_flags; /* 0x03c0 */
+ __u64 gmap; /* 0x03c8 */
+ __u8 pad_0x03d0[0x0e00-0x03d0]; /* 0x03d0 */
/*
* 0xe00 contains the address of the IPL Parameter Information
@@ -193,14 +188,14 @@ extern struct lowcore *lowcore_ptr[];
static inline void set_prefix(__u32 address)
{
- asm volatile("spx %0" : : "m" (address) : "memory");
+ asm volatile("spx %0" : : "Q" (address) : "memory");
}
static inline __u32 store_prefix(void)
{
__u32 address;
- asm volatile("stpx %0" : "=m" (address));
+ asm volatile("stpx %0" : "=Q" (address));
return address;
}
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index cf4c1cb17dcd..f4a07f788f78 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -73,41 +73,38 @@ static inline int init_new_context(struct task_struct *tsk,
static inline void set_user_asce(struct mm_struct *mm)
{
S390_lowcore.user_asce = mm->context.asce;
- if (current->thread.mm_segment.ar4)
- __ctl_load(S390_lowcore.user_asce, 7, 7);
- set_cpu_flag(CIF_ASCE_PRIMARY);
+ __ctl_load(S390_lowcore.user_asce, 1, 1);
+ clear_cpu_flag(CIF_ASCE_PRIMARY);
}
static inline void clear_user_asce(void)
{
S390_lowcore.user_asce = S390_lowcore.kernel_asce;
-
- __ctl_load(S390_lowcore.user_asce, 1, 1);
- __ctl_load(S390_lowcore.user_asce, 7, 7);
-}
-
-static inline void load_kernel_asce(void)
-{
- unsigned long asce;
-
- __ctl_store(asce, 1, 1);
- if (asce != S390_lowcore.kernel_asce)
- __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
set_cpu_flag(CIF_ASCE_PRIMARY);
}
+mm_segment_t enable_sacf_uaccess(void);
+void disable_sacf_uaccess(mm_segment_t old_fs);
+
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
int cpu = smp_processor_id();
- S390_lowcore.user_asce = next->context.asce;
if (prev == next)
return;
+ S390_lowcore.user_asce = next->context.asce;
cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
- /* Clear old ASCE by loading the kernel ASCE. */
- __ctl_load(S390_lowcore.kernel_asce, 1, 1);
- __ctl_load(S390_lowcore.kernel_asce, 7, 7);
+ /* Clear previous user-ASCE from CR1 and CR7 */
+ if (!test_cpu_flag(CIF_ASCE_PRIMARY)) {
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ set_cpu_flag(CIF_ASCE_PRIMARY);
+ }
+ if (test_cpu_flag(CIF_ASCE_SECONDARY)) {
+ __ctl_load(S390_lowcore.vdso_asce, 7, 7);
+ clear_cpu_flag(CIF_ASCE_SECONDARY);
+ }
cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
}
@@ -117,7 +114,6 @@ static inline void finish_arch_post_lock_switch(void)
struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm;
- load_kernel_asce();
if (mm) {
preempt_disable();
while (atomic_read(&mm->context.flush_count))
diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h
index 79aa6421fedb..d6c9d1e0dc2d 100644
--- a/arch/s390/include/asm/perf_event.h
+++ b/arch/s390/include/asm/perf_event.h
@@ -64,27 +64,10 @@ struct perf_sf_sde_regs {
#define REG_OVERFLOW 1
#define OVERFLOW_REG(hwc) ((hwc)->extra_reg.config)
#define SFB_ALLOC_REG(hwc) ((hwc)->extra_reg.alloc)
-#define RAWSAMPLE_REG(hwc) ((hwc)->config)
#define TEAR_REG(hwc) ((hwc)->last_tag)
#define SAMPL_RATE(hwc) ((hwc)->event_base)
#define SAMPL_FLAGS(hwc) ((hwc)->config_base)
#define SAMPL_DIAG_MODE(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_DIAG_MODE)
#define SDB_FULL_BLOCKS(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FULL_BLOCKS)
-/* Structure for sampling data entries to be passed as perf raw sample data
- * to user space. Note that raw sample data must be aligned and, thus, might
- * be padded with zeros.
- */
-struct sf_raw_sample {
-#define SF_RAW_SAMPLE_BASIC PERF_CPUM_SF_BASIC_MODE
-#define SF_RAW_SAMPLE_DIAG PERF_CPUM_SF_DIAG_MODE
- u64 format;
- u32 size; /* Size of sf_raw_sample */
- u16 bsdes; /* Basic-sampling data entry size */
- u16 dsdes; /* Diagnostic-sampling data entry size */
- struct hws_basic_entry basic; /* Basic-sampling data entry */
- struct hws_diag_entry diag; /* Diagnostic-sampling data entry */
- u8 padding[]; /* Padding to next multiple of 8 */
-} __packed;
-
#endif /* _ASM_S390_PERF_EVENT_H */
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index f25bfe888933..bfbfad482289 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -109,9 +109,7 @@ extern void execve_tail(void);
#define HAVE_ARCH_PICK_MMAP_LAYOUT
-typedef struct {
- __u32 ar4;
-} mm_segment_t;
+typedef unsigned int mm_segment_t;
/*
* Thread structure
@@ -247,7 +245,7 @@ static inline unsigned short stap(void)
{
unsigned short cpu_address;
- asm volatile("stap %0" : "=m" (cpu_address));
+ asm volatile("stap %0" : "=Q" (cpu_address));
return cpu_address;
}
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index 2f84e77f1f1b..a3788dafc0e1 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -13,10 +13,12 @@
#define PIF_SYSCALL 0 /* inside a system call */
#define PIF_PER_TRAP 1 /* deliver sigtrap on return to user */
#define PIF_SYSCALL_RESTART 2 /* restart the current system call */
+#define PIF_GUEST_FAULT 3 /* indicates program check in sie64a */
#define _PIF_SYSCALL _BITUL(PIF_SYSCALL)
#define _PIF_PER_TRAP _BITUL(PIF_PER_TRAP)
#define _PIF_SYSCALL_RESTART _BITUL(PIF_SYSCALL_RESTART)
+#define _PIF_GUEST_FAULT _BITUL(PIF_GUEST_FAULT)
#ifndef __ASSEMBLY__
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 8bc87dcb10eb..2eb0c8a7b664 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -36,7 +36,7 @@
#define MACHINE_FLAG_SCC _BITUL(17)
#define LPP_MAGIC _BITUL(31)
-#define LPP_PFAULT_PID_MASK _AC(0xffffffff, UL)
+#define LPP_PID_MASK _AC(0xffffffff, UL)
#ifndef __ASSEMBLY__
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index cdd0f0d999e2..ad6b91013a05 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -16,7 +16,7 @@
#include <asm/processor.h>
#include <asm/ctl_reg.h>
#include <asm/extable.h>
-
+#include <asm/facility.h>
/*
* The fs value determines whether argument validity checking should be
@@ -26,27 +26,16 @@
* For historical reasons, these macros are grossly misnamed.
*/
-#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
-
-
-#define KERNEL_DS MAKE_MM_SEG(0)
-#define USER_DS MAKE_MM_SEG(1)
+#define KERNEL_DS (0)
+#define KERNEL_DS_SACF (1)
+#define USER_DS (2)
+#define USER_DS_SACF (3)
#define get_ds() (KERNEL_DS)
#define get_fs() (current->thread.mm_segment)
-#define segment_eq(a,b) ((a).ar4 == (b).ar4)
+#define segment_eq(a,b) (((a) & 2) == ((b) & 2))
-static inline void set_fs(mm_segment_t fs)
-{
- current->thread.mm_segment = fs;
- if (uaccess_kernel()) {
- set_cpu_flag(CIF_ASCE_SECONDARY);
- __ctl_load(S390_lowcore.kernel_asce, 7, 7);
- } else {
- clear_cpu_flag(CIF_ASCE_SECONDARY);
- __ctl_load(S390_lowcore.user_asce, 7, 7);
- }
-}
+void set_fs(mm_segment_t fs);
static inline int __range_ok(unsigned long addr, unsigned long size)
{
@@ -95,7 +84,7 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n);
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
- unsigned long spec = 0x810000UL;
+ unsigned long spec = 0x010000UL;
int rc;
switch (size) {
@@ -125,7 +114,7 @@ static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
- unsigned long spec = 0x81UL;
+ unsigned long spec = 0x01UL;
int rc;
switch (size) {
diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h
index ae6261ef97d5..169d7604eb80 100644
--- a/arch/s390/include/asm/vdso.h
+++ b/arch/s390/include/asm/vdso.h
@@ -46,6 +46,7 @@ struct vdso_per_cpu_data {
};
extern struct vdso_data *vdso_data;
+extern struct vdso_data boot_vdso_data;
void vdso_alloc_boot_cpu(struct lowcore *lowcore);
int vdso_alloc_per_cpu(struct lowcore *lowcore);
diff --git a/arch/s390/include/uapi/asm/perf_regs.h b/arch/s390/include/uapi/asm/perf_regs.h
new file mode 100644
index 000000000000..7c8564f98205
--- /dev/null
+++ b/arch/s390/include/uapi/asm/perf_regs.h
@@ -0,0 +1,43 @@
+#ifndef _ASM_S390_PERF_REGS_H
+#define _ASM_S390_PERF_REGS_H
+
+enum perf_event_s390_regs {
+ PERF_REG_S390_R0,
+ PERF_REG_S390_R1,
+ PERF_REG_S390_R2,
+ PERF_REG_S390_R3,
+ PERF_REG_S390_R4,
+ PERF_REG_S390_R5,
+ PERF_REG_S390_R6,
+ PERF_REG_S390_R7,
+ PERF_REG_S390_R8,
+ PERF_REG_S390_R9,
+ PERF_REG_S390_R10,
+ PERF_REG_S390_R11,
+ PERF_REG_S390_R12,
+ PERF_REG_S390_R13,
+ PERF_REG_S390_R14,
+ PERF_REG_S390_R15,
+ PERF_REG_S390_FP0,
+ PERF_REG_S390_FP1,
+ PERF_REG_S390_FP2,
+ PERF_REG_S390_FP3,
+ PERF_REG_S390_FP4,
+ PERF_REG_S390_FP5,
+ PERF_REG_S390_FP6,
+ PERF_REG_S390_FP7,
+ PERF_REG_S390_FP8,
+ PERF_REG_S390_FP9,
+ PERF_REG_S390_FP10,
+ PERF_REG_S390_FP11,
+ PERF_REG_S390_FP12,
+ PERF_REG_S390_FP13,
+ PERF_REG_S390_FP14,
+ PERF_REG_S390_FP15,
+ PERF_REG_S390_MASK,
+ PERF_REG_S390_PC,
+
+ PERF_REG_S390_MAX
+};
+
+#endif /* _ASM_S390_PERF_REGS_H */
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 83bc82001c06..909bce65cb2b 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -59,7 +59,7 @@ obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o als.o
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
-obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o
+obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
extra-y += head.o head64.o vmlinux.lds
@@ -77,10 +77,9 @@ obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_UPROBES) += uprobes.o
-obj-$(CONFIG_ALTERNATIVES) += alternative.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o
-obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o
+obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o
obj-$(CONFIG_TRACEPOINTS) += trace.o
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 33ec80df7ed4..587b195b588d 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -171,6 +171,7 @@ int main(void)
OFFSET(__LC_RESTART_DATA, lowcore, restart_data);
OFFSET(__LC_RESTART_SOURCE, lowcore, restart_source);
OFFSET(__LC_USER_ASCE, lowcore, user_asce);
+ OFFSET(__LC_VDSO_ASCE, lowcore, vdso_asce);
OFFSET(__LC_LPP, lowcore, lpp);
OFFSET(__LC_CURRENT_PID, lowcore, current_pid);
OFFSET(__LC_PERCPU_OFFSET, lowcore, percpu_offset);
@@ -178,7 +179,6 @@ int main(void)
OFFSET(__LC_MACHINE_FLAGS, lowcore, machine_flags);
OFFSET(__LC_PREEMPT_COUNT, lowcore, preempt_count);
OFFSET(__LC_GMAP, lowcore, gmap);
- OFFSET(__LC_PASTE, lowcore, paste);
/* software defined ABI-relevant lowcore locations 0xe00 - 0xe20 */
OFFSET(__LC_DUMP_REIPL, lowcore, ipib);
/* hardware defined lowcore locations 0x1000 - 0x18ff */
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index b811d3a8417d..3be829721cf9 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -480,7 +480,7 @@ void show_code(struct pt_regs *regs)
{
char *mode = user_mode(regs) ? "User" : "Krnl";
unsigned char code[64];
- char buffer[64], *ptr;
+ char buffer[128], *ptr;
mm_segment_t old_fs;
unsigned long addr;
int start, end, opsize, hops, i;
@@ -543,7 +543,7 @@ void show_code(struct pt_regs *regs)
start += opsize;
pr_cont("%s", buffer);
ptr = buffer;
- ptr += sprintf(ptr, "\n ");
+ ptr += sprintf(ptr, "\n\t ");
hops++;
}
pr_cont("\n");
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index f498d201f98d..a316cd6999ad 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -379,13 +379,21 @@ ENTRY(system_call)
jg s390_handle_mcck # TIF bit will be cleared by handler
#
-# _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce
+# _CIF_ASCE_PRIMARY and/or _CIF_ASCE_SECONDARY set, load user space asce
#
.Lsysc_asce:
+ ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY
+ lctlg %c7,%c7,__LC_VDSO_ASCE # load secondary asce
+ TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
+ jz .Lsysc_return
+#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
+ tm __LC_STFLE_FAC_LIST+3,0x10 # has MVCOS ?
+ jnz .Lsysc_set_fs_fixup
ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
- TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_SECONDARY
- jz .Lsysc_return
+ j .Lsysc_return
+.Lsysc_set_fs_fixup:
+#endif
larl %r14,.Lsysc_return
jg set_fs_fixup
@@ -518,6 +526,7 @@ ENTRY(pgm_check_handler)
stmg %r8,%r15,__LC_SAVE_AREA_SYNC
lg %r10,__LC_LAST_BREAK
lg %r12,__LC_CURRENT
+ lghi %r11,0
larl %r13,cleanup_critical
lmg %r8,%r9,__LC_PGM_OLD_PSW
tmhh %r8,0x0001 # test problem state bit
@@ -532,6 +541,7 @@ ENTRY(pgm_check_handler)
ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
larl %r9,sie_exit # skip forward to sie_exit
+ lghi %r11,_PIF_GUEST_FAULT
#endif
0: tmhh %r8,0x4000 # PER bit set in old PSW ?
jnz 1f # -> enabled, can't be a double fault
@@ -549,13 +559,14 @@ ENTRY(pgm_check_handler)
jz 3f
mvc __THREAD_trap_tdb(256,%r14),0(%r13)
3: stg %r10,__THREAD_last_break(%r14)
-4: la %r11,STACK_FRAME_OVERHEAD(%r15)
+4: lgr %r13,%r11
+ la %r11,STACK_FRAME_OVERHEAD(%r15)
stmg %r0,%r7,__PT_R0(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
stmg %r8,%r9,__PT_PSW(%r11)
mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
- xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
+ stg %r13,__PT_FLAGS(%r11)
stg %r10,__PT_ARGS(%r11)
tm __LC_PGM_ILC+3,0x80 # check for per exception
jz 5f
@@ -738,10 +749,18 @@ ENTRY(io_int_handler)
# _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce
#
.Lio_asce:
+ ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY
+ lctlg %c7,%c7,__LC_VDSO_ASCE # load secondary asce
+ TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
+ jz .Lio_return
+#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
+ tm __LC_STFLE_FAC_LIST+3,0x10 # has MVCOS ?
+ jnz .Lio_set_fs_fixup
ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
- TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_SECONDARY
- jz .Lio_return
+ j .Lio_return
+.Lio_set_fs_fixup:
+#endif
larl %r14,.Lio_return
jg set_fs_fixup
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 172002da7075..38a973ccf501 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -28,7 +28,7 @@ ENTRY(startup_continue)
lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
lg %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
# move IPL device to lowcore
- lghi %r0,__LC_PASTE
+ larl %r0,boot_vdso_data
stg %r0,__LC_VDSO_PER_CPU
#
# Setup stack
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 6d9f73bb4142..7b87991416fd 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -433,16 +433,13 @@ int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *s;
char *secstrings;
- if (IS_ENABLED(CONFIG_ALTERNATIVES)) {
- secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
- for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
- if (!strcmp(".altinstructions",
- secstrings + s->sh_name)) {
- /* patch .altinstructions */
- void *aseg = (void *)s->sh_addr;
+ secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+ for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
+ if (!strcmp(".altinstructions", secstrings + s->sh_name)) {
+ /* patch .altinstructions */
+ void *aseg = (void *)s->sh_addr;
- apply_alternatives(aseg, aseg + s->sh_size);
- }
+ apply_alternatives(aseg, aseg + s->sh_size);
}
}
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 3f3cda41f32a..6ff169253cae 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -191,7 +191,6 @@ static int notrace s390_check_registers(union mci mci, int umode)
{
union ctlreg2 cr2;
int kill_task;
- void *fpt_save_area;
kill_task = 0;
@@ -224,7 +223,6 @@ static int notrace s390_check_registers(union mci mci, int umode)
if (!test_cpu_flag(CIF_FPU))
kill_task = 1;
}
- fpt_save_area = &S390_lowcore.floating_pt_save_area;
if (!mci.fc) {
/*
* Floating point control register can't be restored.
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index bd4bbf61aaf3..227b38bd82c9 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -15,6 +15,7 @@
#include <linux/kernel_stat.h>
#include <linux/perf_event.h>
#include <linux/percpu.h>
+#include <linux/pid.h>
#include <linux/notifier.h>
#include <linux/export.h>
#include <linux/slab.h>
@@ -77,6 +78,15 @@ struct sf_buffer {
unsigned long *tail; /* last sample-data-block-table */
};
+struct aux_buffer {
+ struct sf_buffer sfb;
+ unsigned long head; /* index of SDB of buffer head */
+ unsigned long alert_mark; /* index of SDB of alert request position */
+ unsigned long empty_mark; /* mark of SDB not marked full */
+ unsigned long *sdb_index; /* SDB address for fast lookup */
+ unsigned long *sdbt_index; /* SDBT address for fast lookup */
+};
+
struct cpu_hw_sf {
/* CPU-measurement sampling information block */
struct hws_qsi_info_block qsi;
@@ -85,6 +95,7 @@ struct cpu_hw_sf {
struct sf_buffer sfb; /* Sampling buffer */
unsigned int flags; /* Status flags */
struct perf_event *event; /* Scheduled perf event */
+ struct perf_output_handle handle; /* AUX buffer output handle */
};
static DEFINE_PER_CPU(struct cpu_hw_sf, cpu_hw_sf);
@@ -341,22 +352,6 @@ static void sfb_init_allocs(unsigned long num, struct hw_perf_event *hwc)
sfb_account_allocs(num, hwc);
}
-static size_t event_sample_size(struct hw_perf_event *hwc)
-{
- struct sf_raw_sample *sfr = (struct sf_raw_sample *) RAWSAMPLE_REG(hwc);
- size_t sample_size;
-
- /* The sample size depends on the sampling function: The basic-sampling
- * function must be always enabled, diagnostic-sampling function is
- * optional.
- */
- sample_size = sfr->bsdes;
- if (SAMPL_DIAG_MODE(hwc))
- sample_size += sfr->dsdes;
-
- return sample_size;
-}
-
static void deallocate_buffers(struct cpu_hw_sf *cpuhw)
{
if (cpuhw->sfb.sdbt)
@@ -366,35 +361,7 @@ static void deallocate_buffers(struct cpu_hw_sf *cpuhw)
static int allocate_buffers(struct cpu_hw_sf *cpuhw, struct hw_perf_event *hwc)
{
unsigned long n_sdb, freq, factor;
- size_t sfr_size, sample_size;
- struct sf_raw_sample *sfr;
-
- /* Allocate raw sample buffer
- *
- * The raw sample buffer is used to temporarily store sampling data
- * entries for perf raw sample processing. The buffer size mainly
- * depends on the size of diagnostic-sampling data entries which is
- * machine-specific. The exact size calculation includes:
- * 1. The first 4 bytes of diagnostic-sampling data entries are
- * already reflected in the sf_raw_sample structure. Subtract
- * these bytes.
- * 2. The perf raw sample data must be 8-byte aligned (u64) and
- * perf's internal data size must be considered too. So add
- * an additional u32 for correct alignment and subtract before
- * allocating the buffer.
- * 3. Store the raw sample buffer pointer in the perf event
- * hardware structure.
- */
- sfr_size = ALIGN((sizeof(*sfr) - sizeof(sfr->diag) + cpuhw->qsi.dsdes) +
- sizeof(u32), sizeof(u64));
- sfr_size -= sizeof(u32);
- sfr = kzalloc(sfr_size, GFP_KERNEL);
- if (!sfr)
- return -ENOMEM;
- sfr->size = sfr_size;
- sfr->bsdes = cpuhw->qsi.bsdes;
- sfr->dsdes = cpuhw->qsi.dsdes;
- RAWSAMPLE_REG(hwc) = (unsigned long) sfr;
+ size_t sample_size;
/* Calculate sampling buffers using 4K pages
*
@@ -420,7 +387,7 @@ static int allocate_buffers(struct cpu_hw_sf *cpuhw, struct hw_perf_event *hwc)
* ensure a minimum of CPUM_SF_MIN_SDBT (one table can manage up
* to 511 SDBs).
*/
- sample_size = event_sample_size(hwc);
+ sample_size = sizeof(struct hws_basic_entry);
freq = sample_rate_to_freq(&cpuhw->qsi, SAMPL_RATE(hwc));
factor = 1;
n_sdb = DIV_ROUND_UP(freq, factor * ((PAGE_SIZE-64) / sample_size));
@@ -619,10 +586,6 @@ static int reserve_pmc_hardware(void)
static void hw_perf_event_destroy(struct perf_event *event)
{
- /* Free raw sample buffer */
- if (RAWSAMPLE_REG(&event->hw))
- kfree((void *) RAWSAMPLE_REG(&event->hw));
-
/* Release PMC if this is the last perf event */
if (!atomic_add_unless(&num_events, -1, 1)) {
mutex_lock(&pmc_reserve_mutex);
@@ -642,15 +605,8 @@ static void hw_init_period(struct hw_perf_event *hwc, u64 period)
static void hw_reset_registers(struct hw_perf_event *hwc,
unsigned long *sdbt_origin)
{
- struct sf_raw_sample *sfr;
-
/* (Re)set to first sample-data-block-table */
TEAR_REG(hwc) = (unsigned long) sdbt_origin;
-
- /* (Re)set raw sampling buffer register */
- sfr = (struct sf_raw_sample *) RAWSAMPLE_REG(hwc);
- memset(&sfr->basic, 0, sizeof(sfr->basic));
- memset(&sfr->diag, 0, sfr->dsdes);
}
static unsigned long hw_limit_rate(const struct hws_qsi_info_block *si,
@@ -660,6 +616,67 @@ static unsigned long hw_limit_rate(const struct hws_qsi_info_block *si,
si->min_sampl_rate, si->max_sampl_rate);
}
+static u32 cpumsf_pid_type(struct perf_event *event,
+ u32 pid, enum pid_type type)
+{
+ struct task_struct *tsk;
+
+ /* Idle process */
+ if (!pid)
+ goto out;
+
+ tsk = find_task_by_pid_ns(pid, &init_pid_ns);
+ pid = -1;
+ if (tsk) {
+ /*
+ * Only top level events contain the pid namespace in which
+ * they are created.
+ */
+ if (event->parent)
+ event = event->parent;
+ pid = __task_pid_nr_ns(tsk, type, event->ns);
+ /*
+ * See also 1d953111b648
+ * "perf/core: Don't report zero PIDs for exiting tasks".
+ */
+ if (!pid && !pid_alive(tsk))
+ pid = -1;
+ }
+out:
+ return pid;
+}
+
+static void cpumsf_output_event_pid(struct perf_event *event,
+ struct perf_sample_data *data,
+ struct pt_regs *regs)
+{
+ u32 pid;
+ struct perf_event_header header;
+ struct perf_output_handle handle;
+
+ /*
+ * Obtain the PID from the basic-sampling data entry and
+ * correct the data->tid_entry.pid value.
+ */
+ pid = data->tid_entry.pid;
+
+ /* Protect callchain buffers, tasks */
+ rcu_read_lock();
+
+ perf_prepare_sample(&header, data, event, regs);
+ if (perf_output_begin(&handle, event, header.size))
+ goto out;
+
+ /* Update the process ID (see also kernel/events/core.c) */
+ data->tid_entry.pid = cpumsf_pid_type(event, pid, __PIDTYPE_TGID);
+ data->tid_entry.tid = cpumsf_pid_type(event, pid, PIDTYPE_PID);
+
+ perf_output_sample(&handle, &header, data, event);
+ perf_output_end(&handle);
+out:
+ rcu_read_unlock();
+}
+
static int __hw_perf_event_init(struct perf_event *event)
{
struct cpu_hw_sf *cpuhw;
@@ -770,6 +787,10 @@ static int __hw_perf_event_init(struct perf_event *event)
hwc->extra_reg.reg = REG_OVERFLOW;
OVERFLOW_REG(hwc) = 0;
+ /* Use AUX buffer. No need to allocate it by ourself */
+ if (attr->config == PERF_EVENT_CPUM_SF_DIAG)
+ return 0;
+
/* Allocate the per-CPU sampling buffer using the CPU information
* from the event. If the event is not pinned to a particular
* CPU (event->cpu == -1; or cpuhw == NULL), allocate sampling
@@ -789,6 +810,14 @@ static int __hw_perf_event_init(struct perf_event *event)
break;
}
}
+
+ /* If PID/TID sampling is active, replace the default overflow
+ * handler to extract and resolve the PIDs from the basic-sampling
+ * data entries.
+ */
+ if (event->attr.sample_type & PERF_SAMPLE_TID)
+ if (is_default_overflow_handler(event))
+ event->overflow_handler = cpumsf_output_event_pid;
out:
return err;
}
@@ -866,10 +895,15 @@ static void cpumsf_pmu_enable(struct pmu *pmu)
*/
if (cpuhw->event) {
hwc = &cpuhw->event->hw;
- /* Account number of overflow-designated buffer extents */
- sfb_account_overflows(cpuhw, hwc);
- if (sfb_has_pending_allocs(&cpuhw->sfb, hwc))
- extend_sampling_buffer(&cpuhw->sfb, hwc);
+ if (!(SAMPL_DIAG_MODE(hwc))) {
+ /*
+ * Account number of overflow-designated
+ * buffer extents
+ */
+ sfb_account_overflows(cpuhw, hwc);
+ if (sfb_has_pending_allocs(&cpuhw->sfb, hwc))
+ extend_sampling_buffer(&cpuhw->sfb, hwc);
+ }
}
/* (Re)enable the PMU and sampling facility */
@@ -884,6 +918,9 @@ static void cpumsf_pmu_enable(struct pmu *pmu)
return;
}
+ /* Load current program parameter */
+ lpp(&S390_lowcore.lpp);
+
debug_sprintf_event(sfdbg, 6, "pmu_enable: es=%i cs=%i ed=%i cd=%i "
"tear=%p dear=%p\n", cpuhw->lsctl.es, cpuhw->lsctl.cs,
cpuhw->lsctl.ed, cpuhw->lsctl.cd,
@@ -967,22 +1004,16 @@ static int perf_exclude_event(struct perf_event *event, struct pt_regs *regs,
*
* Return non-zero if an event overflow occurred.
*/
-static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr)
+static int perf_push_sample(struct perf_event *event,
+ struct hws_basic_entry *basic)
{
int overflow;
struct pt_regs regs;
struct perf_sf_sde_regs *sde_regs;
struct perf_sample_data data;
- struct perf_raw_record raw = {
- .frag = {
- .size = sfr->size,
- .data = sfr,
- },
- };
/* Setup perf sample */
perf_sample_data_init(&data, 0, event->hw.last_period);
- data.raw = &raw;
/* Setup pt_regs to look like an CPU-measurement external interrupt
* using the Program Request Alert code. The regs.int_parm_long
@@ -994,11 +1025,11 @@ static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr)
regs.int_parm = CPU_MF_INT_SF_PRA;
sde_regs = (struct perf_sf_sde_regs *) &regs.int_parm_long;
- psw_bits(regs.psw).ia = sfr->basic.ia;
- psw_bits(regs.psw).dat = sfr->basic.T;
- psw_bits(regs.psw).wait = sfr->basic.W;
- psw_bits(regs.psw).pstate = sfr->basic.P;
- psw_bits(regs.psw).as = sfr->basic.AS;
+ psw_bits(regs.psw).ia = basic->ia;
+ psw_bits(regs.psw).dat = basic->T;
+ psw_bits(regs.psw).wait = basic->W;
+ psw_bits(regs.psw).pstate = basic->P;
+ psw_bits(regs.psw).as = basic->AS;
/*
* Use the hardware provided configuration level to decide if the
@@ -1011,7 +1042,7 @@ static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr)
* If the value differs from 0xffff (the host value), we assume to
* be a KVM guest.
*/
- switch (sfr->basic.CL) {
+ switch (basic->CL) {
case 1: /* logical partition */
sde_regs->in_guest = 0;
break;
@@ -1019,11 +1050,17 @@ static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr)
sde_regs->in_guest = 1;
break;
default: /* old machine, use heuristics */
- if (sfr->basic.gpp || sfr->basic.prim_asn != 0xffff)
+ if (basic->gpp || basic->prim_asn != 0xffff)
sde_regs->in_guest = 1;
break;
}
+ /*
+ * Store the PID value from the sample-data-entry to be
+ * processed and resolved by cpumsf_output_event_pid().
+ */
+ data.tid_entry.pid = basic->hpp & LPP_PID_MASK;
+
overflow = 0;
if (perf_exclude_event(event, &regs, sde_regs))
goto out;
@@ -1041,75 +1078,12 @@ static void perf_event_count_update(struct perf_event *event, u64 count)
local64_add(count, &event->count);
}
-static int sample_format_is_valid(struct hws_combined_entry *sample,
- unsigned int flags)
-{
- if (likely(flags & PERF_CPUM_SF_BASIC_MODE))
- /* Only basic-sampling data entries with data-entry-format
- * version of 0x0001 can be processed.
- */
- if (sample->basic.def != 0x0001)
- return 0;
- if (flags & PERF_CPUM_SF_DIAG_MODE)
- /* The data-entry-format number of diagnostic-sampling data
- * entries can vary. Because diagnostic data is just passed
- * through, do only a sanity check on the DEF.
- */
- if (sample->diag.def < 0x8001)
- return 0;
- return 1;
-}
-
-static int sample_is_consistent(struct hws_combined_entry *sample,
- unsigned long flags)
-{
- /* This check applies only to basic-sampling data entries of potentially
- * combined-sampling data entries. Invalid entries cannot be processed
- * by the PMU and, thus, do not deliver an associated
- * diagnostic-sampling data entry.
- */
- if (unlikely(!(flags & PERF_CPUM_SF_BASIC_MODE)))
- return 0;
- /*
- * Samples are skipped, if they are invalid or for which the
- * instruction address is not predictable, i.e., the wait-state bit is
- * set.
- */
- if (sample->basic.I || sample->basic.W)
- return 0;
- return 1;
-}
-
-static void reset_sample_slot(struct hws_combined_entry *sample,
- unsigned long flags)
-{
- if (likely(flags & PERF_CPUM_SF_BASIC_MODE))
- sample->basic.def = 0;
- if (flags & PERF_CPUM_SF_DIAG_MODE)
- sample->diag.def = 0;
-}
-
-static void sfr_store_sample(struct sf_raw_sample *sfr,
- struct hws_combined_entry *sample)
-{
- if (likely(sfr->format & PERF_CPUM_SF_BASIC_MODE))
- sfr->basic = sample->basic;
- if (sfr->format & PERF_CPUM_SF_DIAG_MODE)
- memcpy(&sfr->diag, &sample->diag, sfr->dsdes);
-}
-
-static void debug_sample_entry(struct hws_combined_entry *sample,
- struct hws_trailer_entry *te,
- unsigned long flags)
+static void debug_sample_entry(struct hws_basic_entry *sample,
+ struct hws_trailer_entry *te)
{
debug_sprintf_event(sfdbg, 4, "hw_collect_samples: Found unknown "
- "sampling data entry: te->f=%i basic.def=%04x (%p)"
- " diag.def=%04x (%p)\n", te->f,
- sample->basic.def, &sample->basic,
- (flags & PERF_CPUM_SF_DIAG_MODE)
- ? sample->diag.def : 0xFFFF,
- (flags & PERF_CPUM_SF_DIAG_MODE)
- ? &sample->diag : NULL);
+ "sampling data entry: te->f=%i basic.def=%04x (%p)\n",
+ te->f, sample->def, sample);
}
/* hw_collect_samples() - Walk through a sample-data-block and collect samples
@@ -1135,44 +1109,37 @@ static void debug_sample_entry(struct hws_combined_entry *sample,
static void hw_collect_samples(struct perf_event *event, unsigned long *sdbt,
unsigned long long *overflow)
{
- unsigned long flags = SAMPL_FLAGS(&event->hw);
- struct hws_combined_entry *sample;
struct hws_trailer_entry *te;
- struct sf_raw_sample *sfr;
- size_t sample_size;
-
- /* Prepare and initialize raw sample data */
- sfr = (struct sf_raw_sample *) RAWSAMPLE_REG(&event->hw);
- sfr->format = flags & PERF_CPUM_SF_MODE_MASK;
+ struct hws_basic_entry *sample;
- sample_size = event_sample_size(&event->hw);
te = (struct hws_trailer_entry *) trailer_entry_ptr(*sdbt);
- sample = (struct hws_combined_entry *) *sdbt;
+ sample = (struct hws_basic_entry *) *sdbt;
while ((unsigned long *) sample < (unsigned long *) te) {
/* Check for an empty sample */
- if (!sample->basic.def)
+ if (!sample->def)
break;
/* Update perf event period */
perf_event_count_update(event, SAMPL_RATE(&event->hw));
- /* Check sampling data entry */
- if (sample_format_is_valid(sample, flags)) {
+ /* Check whether sample is valid */
+ if (sample->def == 0x0001) {
/* If an event overflow occurred, the PMU is stopped to
* throttle event delivery. Remaining sample data is
* discarded.
*/
if (!*overflow) {
- if (sample_is_consistent(sample, flags)) {
+ /* Check whether sample is consistent */
+ if (sample->I == 0 && sample->W == 0) {
/* Deliver sample data to perf */
- sfr_store_sample(sfr, sample);
- *overflow = perf_push_sample(event, sfr);
+ *overflow = perf_push_sample(event,
+ sample);
}
} else
/* Count discarded samples */
*overflow += 1;
} else {
- debug_sample_entry(sample, te, flags);
+ debug_sample_entry(sample, te);
/* Sample slot is not yet written or other record.
*
* This condition can occur if the buffer was reused
@@ -1188,8 +1155,8 @@ static void hw_collect_samples(struct perf_event *event, unsigned long *sdbt,
}
/* Reset sample slot and advance to next sample */
- reset_sample_slot(sample, flags);
- sample += sample_size;
+ sample->def = 0;
+ sample++;
}
}
@@ -1215,6 +1182,13 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all)
unsigned long long event_overflow, sampl_overflow, num_sdb, te_flags;
int done;
+ /*
+ * AUX buffer is used when in diagnostic sampling mode.
+ * No perf events/samples are created.
+ */
+ if (SAMPL_DIAG_MODE(&event->hw))
+ return;
+
if (flush_all && SDB_FULL_BLOCKS(hwc))
flush_all = 0;
@@ -1291,6 +1265,439 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all)
sampl_overflow, event_overflow);
}
+#define AUX_SDB_INDEX(aux, i) ((i) % aux->sfb.num_sdb)
+#define AUX_SDB_NUM(aux, start, end) (end >= start ? end - start + 1 : 0)
+#define AUX_SDB_NUM_ALERT(aux) AUX_SDB_NUM(aux, aux->head, aux->alert_mark)
+#define AUX_SDB_NUM_EMPTY(aux) AUX_SDB_NUM(aux, aux->head, aux->empty_mark)
+
+/*
+ * Get trailer entry by index of SDB.
+ */
+static struct hws_trailer_entry *aux_sdb_trailer(struct aux_buffer *aux,
+ unsigned long index)
+{
+ unsigned long sdb;
+
+ index = AUX_SDB_INDEX(aux, index);
+ sdb = aux->sdb_index[index];
+ return (struct hws_trailer_entry *)trailer_entry_ptr(sdb);
+}
+
+/*
+ * Finish sampling on the cpu. Called by cpumsf_pmu_del() with pmu
+ * disabled. Collect the full SDBs in AUX buffer which have not reached
+ * the point of alert indicator. And ignore the SDBs which are not
+ * full.
+ *
+ * 1. Scan SDBs to see how much data is there and consume them.
+ * 2. Remove alert indicator in the buffer.
+ */
+static void aux_output_end(struct perf_output_handle *handle)
+{
+ unsigned long i, range_scan, idx;
+ struct aux_buffer *aux;
+ struct hws_trailer_entry *te;
+
+ aux = perf_get_aux(handle);
+ if (!aux)
+ return;
+
+ range_scan = AUX_SDB_NUM_ALERT(aux);
+ for (i = 0, idx = aux->head; i < range_scan; i++, idx++) {
+ te = aux_sdb_trailer(aux, idx);
+ if (!(te->flags & SDB_TE_BUFFER_FULL_MASK))
+ break;
+ }
+ /* i is num of SDBs which are full */
+ perf_aux_output_end(handle, i << PAGE_SHIFT);
+
+ /* Remove alert indicators in the buffer */
+ te = aux_sdb_trailer(aux, aux->alert_mark);
+ te->flags &= ~SDB_TE_ALERT_REQ_MASK;
+
+ debug_sprintf_event(sfdbg, 6, "aux_output_end: collect %lx SDBs\n", i);
+}
+
+/*
+ * Start sampling on the CPU. Called by cpumsf_pmu_add() when an event
+ * is first added to the CPU or rescheduled again to the CPU. It is called
+ * with pmu disabled.
+ *
+ * 1. Reset the trailer of SDBs to get ready for new data.
+ * 2. Tell the hardware where to put the data by reset the SDBs buffer
+ * head(tear/dear).
+ */
+static int aux_output_begin(struct perf_output_handle *handle,
+ struct aux_buffer *aux,
+ struct cpu_hw_sf *cpuhw)
+{
+ unsigned long range;
+ unsigned long i, range_scan, idx;
+ unsigned long head, base, offset;
+ struct hws_trailer_entry *te;
+
+ if (WARN_ON_ONCE(handle->head & ~PAGE_MASK))
+ return -EINVAL;
+
+ aux->head = handle->head >> PAGE_SHIFT;
+ range = (handle->size + 1) >> PAGE_SHIFT;
+ if (range <= 1)
+ return -ENOMEM;
+
+ /*
+ * SDBs between aux->head and aux->empty_mark are already ready
+ * for new data. range_scan is num of SDBs not within them.
+ */
+ if (range > AUX_SDB_NUM_EMPTY(aux)) {
+ range_scan = range - AUX_SDB_NUM_EMPTY(aux);
+ idx = aux->empty_mark + 1;
+ for (i = 0; i < range_scan; i++, idx++) {
+ te = aux_sdb_trailer(aux, idx);
+ te->flags = te->flags & ~SDB_TE_BUFFER_FULL_MASK;
+ te->flags = te->flags & ~SDB_TE_ALERT_REQ_MASK;
+ te->overflow = 0;
+ }
+ /* Save the position of empty SDBs */
+ aux->empty_mark = aux->head + range - 1;
+ }
+
+ /* Set alert indicator */
+ aux->alert_mark = aux->head + range/2 - 1;
+ te = aux_sdb_trailer(aux, aux->alert_mark);
+ te->flags = te->flags | SDB_TE_ALERT_REQ_MASK;
+
+ /* Reset hardware buffer head */
+ head = AUX_SDB_INDEX(aux, aux->head);
+ base = aux->sdbt_index[head / CPUM_SF_SDB_PER_TABLE];
+ offset = head % CPUM_SF_SDB_PER_TABLE;
+ cpuhw->lsctl.tear = base + offset * sizeof(unsigned long);
+ cpuhw->lsctl.dear = aux->sdb_index[head];
+
+ debug_sprintf_event(sfdbg, 6, "aux_output_begin: "
+ "head->alert_mark->empty_mark (num_alert, range)"
+ "[%lx -> %lx -> %lx] (%lx, %lx) "
+ "tear index %lx, tear %lx dear %lx\n",
+ aux->head, aux->alert_mark, aux->empty_mark,
+ AUX_SDB_NUM_ALERT(aux), range,
+ head / CPUM_SF_SDB_PER_TABLE,
+ cpuhw->lsctl.tear,
+ cpuhw->lsctl.dear);
+
+ return 0;
+}
+
+/*
+ * Set alert indicator on SDB at index @alert_index while sampler is running.
+ *
+ * Return true if successfully.
+ * Return false if full indicator is already set by hardware sampler.
+ */
+static bool aux_set_alert(struct aux_buffer *aux, unsigned long alert_index,
+ unsigned long long *overflow)
+{
+ unsigned long long orig_overflow, orig_flags, new_flags;
+ struct hws_trailer_entry *te;
+
+ te = aux_sdb_trailer(aux, alert_index);
+ do {
+ orig_flags = te->flags;
+ orig_overflow = te->overflow;
+ *overflow = orig_overflow;
+ if (orig_flags & SDB_TE_BUFFER_FULL_MASK) {
+ /*
+ * SDB is already set by hardware.
+ * Abort and try to set somewhere
+ * behind.
+ */
+ return false;
+ }
+ new_flags = orig_flags | SDB_TE_ALERT_REQ_MASK;
+ } while (!cmpxchg_double(&te->flags, &te->overflow,
+ orig_flags, orig_overflow,
+ new_flags, 0ULL));
+ return true;
+}
+
+/*
+ * aux_reset_buffer() - Scan and setup SDBs for new samples
+ * @aux: The AUX buffer to set
+ * @range: The range of SDBs to scan started from aux->head
+ * @overflow: Set to overflow count
+ *
+ * Set alert indicator on the SDB at index of aux->alert_mark. If this SDB is
+ * marked as empty, check if it is already set full by the hardware sampler.
+ * If yes, that means new data is already there before we can set an alert
+ * indicator. Caller should try to set alert indicator to some position behind.
+ *
+ * Scan the SDBs in AUX buffer from behind aux->empty_mark. They are used
+ * previously and have already been consumed by user space. Reset these SDBs
+ * (clear full indicator and alert indicator) for new data.
+ * If aux->alert_mark fall in this area, just set it. Overflow count is
+ * recorded while scanning.
+ *
+ * SDBs between aux->head and aux->empty_mark are already reset at last time.
+ * and ready for new samples. So scanning on this area could be skipped.
+ *
+ * Return true if alert indicator is set successfully and false if not.
+ */
+static bool aux_reset_buffer(struct aux_buffer *aux, unsigned long range,
+ unsigned long long *overflow)
+{
+ unsigned long long orig_overflow, orig_flags, new_flags;
+ unsigned long i, range_scan, idx;
+ struct hws_trailer_entry *te;
+
+ if (range <= AUX_SDB_NUM_EMPTY(aux))
+ /*
+ * No need to scan. All SDBs in range are marked as empty.
+ * Just set alert indicator. Should check race with hardware
+ * sampler.
+ */
+ return aux_set_alert(aux, aux->alert_mark, overflow);
+
+ if (aux->alert_mark <= aux->empty_mark)
+ /*
+ * Set alert indicator on empty SDB. Should check race
+ * with hardware sampler.
+ */
+ if (!aux_set_alert(aux, aux->alert_mark, overflow))
+ return false;
+
+ /*
+ * Scan the SDBs to clear full and alert indicator used previously.
+ * Start scanning from one SDB behind empty_mark. If the new alert
+ * indicator fall into this range, set it.
+ */
+ range_scan = range - AUX_SDB_NUM_EMPTY(aux);
+ idx = aux->empty_mark + 1;
+ for (i = 0; i < range_scan; i++, idx++) {
+ te = aux_sdb_trailer(aux, idx);
+ do {
+ orig_flags = te->flags;
+ orig_overflow = te->overflow;
+ new_flags = orig_flags & ~SDB_TE_BUFFER_FULL_MASK;
+ if (idx == aux->alert_mark)
+ new_flags |= SDB_TE_ALERT_REQ_MASK;
+ else
+ new_flags &= ~SDB_TE_ALERT_REQ_MASK;
+ } while (!cmpxchg_double(&te->flags, &te->overflow,
+ orig_flags, orig_overflow,
+ new_flags, 0ULL));
+ *overflow += orig_overflow;
+ }
+
+ /* Update empty_mark to new position */
+ aux->empty_mark = aux->head + range - 1;
+
+ return true;
+}
+
+/*
+ * Measurement alert handler for diagnostic mode sampling.
+ */
+static void hw_collect_aux(struct cpu_hw_sf *cpuhw)
+{
+ struct aux_buffer *aux;
+ int done = 0;
+ unsigned long range = 0, size;
+ unsigned long long overflow = 0;
+ struct perf_output_handle *handle = &cpuhw->handle;
+ unsigned long num_sdb;
+
+ aux = perf_get_aux(handle);
+ if (WARN_ON_ONCE(!aux))
+ return;
+
+ /* Inform user space new data arrived */
+ size = AUX_SDB_NUM_ALERT(aux) << PAGE_SHIFT;
+ perf_aux_output_end(handle, size);
+ num_sdb = aux->sfb.num_sdb;
+
+ while (!done) {
+ /* Get an output handle */
+ aux = perf_aux_output_begin(handle, cpuhw->event);
+ if (handle->size == 0) {
+ pr_err("The AUX buffer with %lu pages for the "
+ "diagnostic-sampling mode is full\n",
+ num_sdb);
+ debug_sprintf_event(sfdbg, 1, "AUX buffer used up\n");
+ break;
+ }
+ if (WARN_ON_ONCE(!aux))
+ return;
+
+ /* Update head and alert_mark to new position */
+ aux->head = handle->head >> PAGE_SHIFT;
+ range = (handle->size + 1) >> PAGE_SHIFT;
+ if (range == 1)
+ aux->alert_mark = aux->head;
+ else
+ aux->alert_mark = aux->head + range/2 - 1;
+
+ if (aux_reset_buffer(aux, range, &overflow)) {
+ if (!overflow) {
+ done = 1;
+ break;
+ }
+ size = range << PAGE_SHIFT;
+ perf_aux_output_end(&cpuhw->handle, size);
+ pr_err("Sample data caused the AUX buffer with %lu "
+ "pages to overflow\n", num_sdb);
+ debug_sprintf_event(sfdbg, 1, "head %lx range %lx "
+ "overflow %llx\n",
+ aux->head, range, overflow);
+ } else {
+ size = AUX_SDB_NUM_ALERT(aux) << PAGE_SHIFT;
+ perf_aux_output_end(&cpuhw->handle, size);
+ debug_sprintf_event(sfdbg, 6, "head %lx alert %lx "
+ "already full, try another\n",
+ aux->head, aux->alert_mark);
+ }
+ }
+
+ if (done)
+ debug_sprintf_event(sfdbg, 6, "aux_reset_buffer: "
+ "[%lx -> %lx -> %lx] (%lx, %lx)\n",
+ aux->head, aux->alert_mark, aux->empty_mark,
+ AUX_SDB_NUM_ALERT(aux), range);
+}
+
+/*
+ * Callback when freeing AUX buffers.
+ */
+static void aux_buffer_free(void *data)
+{
+ struct aux_buffer *aux = data;
+ unsigned long i, num_sdbt;
+
+ if (!aux)
+ return;
+
+ /* Free SDBT. SDB is freed by the caller */
+ num_sdbt = aux->sfb.num_sdbt;
+ for (i = 0; i < num_sdbt; i++)
+ free_page(aux->sdbt_index[i]);
+
+ kfree(aux->sdbt_index);
+ kfree(aux->sdb_index);
+ kfree(aux);
+
+ debug_sprintf_event(sfdbg, 4, "aux_buffer_free: free "
+ "%lu SDBTs\n", num_sdbt);
+}
+
+/*
+ * aux_buffer_setup() - Setup AUX buffer for diagnostic mode sampling
+ * @cpu: On which to allocate, -1 means current
+ * @pages: Array of pointers to buffer pages passed from perf core
+ * @nr_pages: Total pages
+ * @snapshot: Flag for snapshot mode
+ *
+ * This is the callback when setup an event using AUX buffer. Perf tool can
+ * trigger this by an additional mmap() call on the event. Unlike the buffer
+ * for basic samples, AUX buffer belongs to the event. It is scheduled with
+ * the task among online cpus when it is a per-thread event.
+ *
+ * Return the private AUX buffer structure if success or NULL if fails.
+ */
+static void *aux_buffer_setup(int cpu, void **pages, int nr_pages,
+ bool snapshot)
+{
+ struct sf_buffer *sfb;
+ struct aux_buffer *aux;
+ unsigned long *new, *tail;
+ int i, n_sdbt;
+
+ if (!nr_pages || !pages)
+ return NULL;
+
+ if (nr_pages > CPUM_SF_MAX_SDB * CPUM_SF_SDB_DIAG_FACTOR) {
+ pr_err("AUX buffer size (%i pages) is larger than the "
+ "maximum sampling buffer limit\n",
+ nr_pages);
+ return NULL;
+ } else if (nr_pages < CPUM_SF_MIN_SDB * CPUM_SF_SDB_DIAG_FACTOR) {
+ pr_err("AUX buffer size (%i pages) is less than the "
+ "minimum sampling buffer limit\n",
+ nr_pages);
+ return NULL;
+ }
+
+ /* Allocate aux_buffer struct for the event */
+ aux = kmalloc(sizeof(struct aux_buffer), GFP_KERNEL);
+ if (!aux)
+ goto no_aux;
+ sfb = &aux->sfb;
+
+ /* Allocate sdbt_index for fast reference */
+ n_sdbt = (nr_pages + CPUM_SF_SDB_PER_TABLE - 1) / CPUM_SF_SDB_PER_TABLE;
+ aux->sdbt_index = kmalloc_array(n_sdbt, sizeof(void *), GFP_KERNEL);
+ if (!aux->sdbt_index)
+ goto no_sdbt_index;
+
+ /* Allocate sdb_index for fast reference */
+ aux->sdb_index = kmalloc_array(nr_pages, sizeof(void *), GFP_KERNEL);
+ if (!aux->sdb_index)
+ goto no_sdb_index;
+
+ /* Allocate the first SDBT */
+ sfb->num_sdbt = 0;
+ sfb->sdbt = (unsigned long *) get_zeroed_page(GFP_KERNEL);
+ if (!sfb->sdbt)
+ goto no_sdbt;
+ aux->sdbt_index[sfb->num_sdbt++] = (unsigned long)sfb->sdbt;
+ tail = sfb->tail = sfb->sdbt;
+
+ /*
+ * Link the provided pages of AUX buffer to SDBT.
+ * Allocate SDBT if needed.
+ */
+ for (i = 0; i < nr_pages; i++, tail++) {
+ if (require_table_link(tail)) {
+ new = (unsigned long *) get_zeroed_page(GFP_KERNEL);
+ if (!new)
+ goto no_sdbt;
+ aux->sdbt_index[sfb->num_sdbt++] = (unsigned long)new;
+ /* Link current page to tail of chain */
+ *tail = (unsigned long)(void *) new + 1;
+ tail = new;
+ }
+ /* Tail is the entry in a SDBT */
+ *tail = (unsigned long)pages[i];
+ aux->sdb_index[i] = (unsigned long)pages[i];
+ }
+ sfb->num_sdb = nr_pages;
+
+ /* Link the last entry in the SDBT to the first SDBT */
+ *tail = (unsigned long) sfb->sdbt + 1;
+ sfb->tail = tail;
+
+ /*
+ * Initial all SDBs are zeroed. Mark it as empty.
+ * So there is no need to clear the full indicator
+ * when this event is first added.
+ */
+ aux->empty_mark = sfb->num_sdb - 1;
+
+ debug_sprintf_event(sfdbg, 4, "aux_buffer_setup: setup %lu SDBTs"
+ " and %lu SDBs\n",
+ sfb->num_sdbt, sfb->num_sdb);
+
+ return aux;
+
+no_sdbt:
+ /* SDBs (AUX buffer pages) are freed by caller */
+ for (i = 0; i < sfb->num_sdbt; i++)
+ free_page(aux->sdbt_index[i]);
+ kfree(aux->sdb_index);
+no_sdb_index:
+ kfree(aux->sdbt_index);
+no_sdbt_index:
+ kfree(aux);
+no_aux:
+ return NULL;
+}
+
static void cpumsf_pmu_read(struct perf_event *event)
{
/* Nothing to do ... updates are interrupt-driven */
@@ -1342,12 +1749,13 @@ static void cpumsf_pmu_stop(struct perf_event *event, int flags)
static int cpumsf_pmu_add(struct perf_event *event, int flags)
{
struct cpu_hw_sf *cpuhw = this_cpu_ptr(&cpu_hw_sf);
+ struct aux_buffer *aux;
int err;
if (cpuhw->flags & PMU_F_IN_USE)
return -EAGAIN;
- if (!cpuhw->sfb.sdbt)
+ if (!SAMPL_DIAG_MODE(&event->hw) && !cpuhw->sfb.sdbt)
return -EINVAL;
err = 0;
@@ -1362,10 +1770,12 @@ static int cpumsf_pmu_add(struct perf_event *event, int flags)
*/
cpuhw->lsctl.s = 0;
cpuhw->lsctl.h = 1;
- cpuhw->lsctl.tear = (unsigned long) cpuhw->sfb.sdbt;
- cpuhw->lsctl.dear = *(unsigned long *) cpuhw->sfb.sdbt;
cpuhw->lsctl.interval = SAMPL_RATE(&event->hw);
- hw_reset_registers(&event->hw, cpuhw->sfb.sdbt);
+ if (!SAMPL_DIAG_MODE(&event->hw)) {
+ cpuhw->lsctl.tear = (unsigned long) cpuhw->sfb.sdbt;
+ cpuhw->lsctl.dear = *(unsigned long *) cpuhw->sfb.sdbt;
+ hw_reset_registers(&event->hw, cpuhw->sfb.sdbt);
+ }
/* Ensure sampling functions are in the disabled state. If disabled,
* switch on sampling enable control. */
@@ -1373,9 +1783,18 @@ static int cpumsf_pmu_add(struct perf_event *event, int flags)
err = -EAGAIN;
goto out;
}
- cpuhw->lsctl.es = 1;
- if (SAMPL_DIAG_MODE(&event->hw))
+ if (SAMPL_DIAG_MODE(&event->hw)) {
+ aux = perf_aux_output_begin(&cpuhw->handle, event);
+ if (!aux) {
+ err = -EINVAL;
+ goto out;
+ }
+ err = aux_output_begin(&cpuhw->handle, aux, cpuhw);
+ if (err)
+ goto out;
cpuhw->lsctl.ed = 1;
+ }
+ cpuhw->lsctl.es = 1;
/* Set in_use flag and store event */
cpuhw->event = event;
@@ -1401,6 +1820,8 @@ static void cpumsf_pmu_del(struct perf_event *event, int flags)
cpuhw->flags &= ~PMU_F_IN_USE;
cpuhw->event = NULL;
+ if (SAMPL_DIAG_MODE(&event->hw))
+ aux_output_end(&cpuhw->handle);
perf_event_update_userpage(event);
perf_pmu_enable(event->pmu);
}
@@ -1448,6 +1869,9 @@ static struct pmu cpumf_sampling = {
.read = cpumsf_pmu_read,
.attr_groups = cpumsf_pmu_attr_groups,
+
+ .setup_aux = aux_buffer_setup,
+ .free_aux = aux_buffer_free,
};
static void cpumf_measurement_alert(struct ext_code ext_code,
@@ -1471,7 +1895,10 @@ static void cpumf_measurement_alert(struct ext_code ext_code,
/* Program alert request */
if (alert & CPU_MF_INT_SF_PRA) {
if (cpuhw->flags & PMU_F_IN_USE)
- hw_perf_event_update(cpuhw->event, 0);
+ if (SAMPL_DIAG_MODE(&cpuhw->event->hw))
+ hw_collect_aux(cpuhw);
+ else
+ hw_perf_event_update(cpuhw->event, 0);
else
WARN_ON_ONCE(!(cpuhw->flags & PMU_F_IN_USE));
}
@@ -1590,6 +2017,9 @@ static int __init init_cpum_sampling_pmu(void)
return -ENODEV;
}
+ if (!si.as && !si.ad)
+ return -ENODEV;
+
if (si.bsdes != sizeof(struct hws_basic_entry)) {
pr_cpumsf_err(RS_INIT_FAILURE_BSDES);
return -EINVAL;
diff --git a/arch/s390/kernel/perf_regs.c b/arch/s390/kernel/perf_regs.c
new file mode 100644
index 000000000000..f8603ebed669
--- /dev/null
+++ b/arch/s390/kernel/perf_regs.c
@@ -0,0 +1,70 @@
+#include <linux/perf_event.h>
+#include <linux/perf_regs.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/bug.h>
+#include <asm/ptrace.h>
+#include <asm/fpu/api.h>
+#include <asm/fpu/types.h>
+
+u64 perf_reg_value(struct pt_regs *regs, int idx)
+{
+ freg_t fp;
+
+ if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX))
+ return 0;
+
+ if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
+ return regs->gprs[idx];
+
+ if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
+ if (!user_mode(regs))
+ return 0;
+
+ idx -= PERF_REG_S390_FP0;
+ fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx)
+ : current->thread.fpu.fprs[idx];
+ return fp.ui;
+ }
+
+ if (idx == PERF_REG_S390_MASK)
+ return regs->psw.mask;
+ if (idx == PERF_REG_S390_PC)
+ return regs->psw.addr;
+
+ return regs->gprs[idx];
+}
+
+#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
+
+int perf_reg_validate(u64 mask)
+{
+ if (!mask || mask & REG_RESERVED)
+ return -EINVAL;
+
+ return 0;
+}
+
+u64 perf_reg_abi(struct task_struct *task)
+{
+ if (test_tsk_thread_flag(task, TIF_31BIT))
+ return PERF_SAMPLE_REGS_ABI_32;
+
+ return PERF_SAMPLE_REGS_ABI_64;
+}
+
+void perf_get_regs_user(struct perf_regs *regs_user,
+ struct pt_regs *regs,
+ struct pt_regs *regs_user_copy)
+{
+ /*
+ * Use the regs from the first interruption and let
+ * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
+ *
+ * Also save FPU registers for user-space tasks only.
+ */
+ regs_user->regs = task_pt_regs(current);
+ if (user_mode(regs_user->regs))
+ save_fpu_regs();
+ regs_user->abi = perf_reg_abi(current);
+}
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 0520854a4dab..39a218703c50 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -158,16 +158,9 @@ int vdso_alloc_per_cpu(struct lowcore *lowcore)
{
unsigned long segment_table, page_table, page_frame;
struct vdso_per_cpu_data *vd;
- u32 *psal, *aste;
- int i;
-
- lowcore->vdso_per_cpu_data = __LC_PASTE;
-
- if (!vdso_enabled)
- return 0;
segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER);
- page_table = get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ page_table = get_zeroed_page(GFP_KERNEL);
page_frame = get_zeroed_page(GFP_KERNEL);
if (!segment_table || !page_table || !page_frame)
goto out;
@@ -179,25 +172,15 @@ int vdso_alloc_per_cpu(struct lowcore *lowcore)
vd->cpu_nr = lowcore->cpu_nr;
vd->node_id = cpu_to_node(vd->cpu_nr);
- /* Set up access register mode page table */
+ /* Set up page table for the vdso address space */
memset64((u64 *)segment_table, _SEGMENT_ENTRY_EMPTY, _CRST_ENTRIES);
memset64((u64 *)page_table, _PAGE_INVALID, PTRS_PER_PTE);
*(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table;
*(unsigned long *) page_table = _PAGE_PROTECT + page_frame;
- psal = (u32 *) (page_table + 256*sizeof(unsigned long));
- aste = psal + 32;
-
- for (i = 4; i < 32; i += 4)
- psal[i] = 0x80000000;
-
- lowcore->paste[4] = (u32)(addr_t) psal;
- psal[0] = 0x02000000;
- psal[2] = (u32)(addr_t) aste;
- *(unsigned long *) (aste + 2) = segment_table +
+ lowcore->vdso_asce = segment_table +
_ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT;
- aste[4] = (u32)(addr_t) psal;
lowcore->vdso_per_cpu_data = page_frame;
return 0;
@@ -212,14 +195,8 @@ out:
void vdso_free_per_cpu(struct lowcore *lowcore)
{
unsigned long segment_table, page_table, page_frame;
- u32 *psal, *aste;
-
- if (!vdso_enabled)
- return;
- psal = (u32 *)(addr_t) lowcore->paste[4];
- aste = (u32 *)(addr_t) psal[2];
- segment_table = *(unsigned long *)(aste + 2) & PAGE_MASK;
+ segment_table = lowcore->vdso_asce & PAGE_MASK;
page_table = *(unsigned long *) segment_table;
page_frame = *(unsigned long *) page_table;
@@ -228,16 +205,6 @@ void vdso_free_per_cpu(struct lowcore *lowcore)
free_pages(segment_table, SEGMENT_ORDER);
}
-static void vdso_init_cr5(void)
-{
- unsigned long cr5;
-
- if (!vdso_enabled)
- return;
- cr5 = offsetof(struct lowcore, paste);
- __ctl_load(cr5, 5, 5);
-}
-
/*
* This is called from binfmt_elf, we create the special vma for the
* vDSO and insert it into the mm struct tree
@@ -314,8 +281,6 @@ static int __init vdso_init(void)
{
int i;
- if (!vdso_enabled)
- return 0;
vdso_init_data(vdso_data);
#ifdef CONFIG_COMPAT
/* Calculate the size of the 32 bit vDSO */
@@ -354,7 +319,6 @@ static int __init vdso_init(void)
vdso64_pagelist[vdso64_pages] = NULL;
if (vdso_alloc_per_cpu(&S390_lowcore))
BUG();
- vdso_init_cr5();
get_page(virt_to_page(vdso_data));
diff --git a/arch/s390/kernel/vdso32/getcpu.S b/arch/s390/kernel/vdso32/getcpu.S
index 6e30769dd017..5477a2c112fb 100644
--- a/arch/s390/kernel/vdso32/getcpu.S
+++ b/arch/s390/kernel/vdso32/getcpu.S
@@ -15,23 +15,11 @@
.type __kernel_getcpu,@function
__kernel_getcpu:
.cfi_startproc
- ear %r1,%a4
- lhi %r4,1
- sll %r4,24
- sar %a4,%r4
la %r4,0
- epsw %r0,0
- sacf 512
+ sacf 256
l %r5,__VDSO_CPU_NR(%r4)
l %r4,__VDSO_NODE_ID(%r4)
- tml %r0,0x4000
- jo 1f
- tml %r0,0x8000
- jno 0f
- sacf 256
- j 1f
-0: sacf 0
-1: sar %a4,%r1
+ sacf 0
ltr %r2,%r2
jz 2f
st %r5,0(%r2)
diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S
index 9c3b12626dba..5d7b56b49458 100644
--- a/arch/s390/kernel/vdso64/clock_gettime.S
+++ b/arch/s390/kernel/vdso64/clock_gettime.S
@@ -114,23 +114,12 @@ __kernel_clock_gettime:
br %r14
/* CPUCLOCK_VIRT for this thread */
-9: icm %r0,15,__VDSO_ECTG_OK(%r5)
+9: lghi %r4,0
+ icm %r0,15,__VDSO_ECTG_OK(%r5)
jz 12f
- ear %r2,%a4
- llilh %r4,0x0100
- sar %a4,%r4
- lghi %r4,0
- epsw %r5,0
- sacf 512 /* Magic ectg instruction */
+ sacf 256 /* Magic ectg instruction */
.insn ssf,0xc80100000000,__VDSO_ECTG_BASE(4),__VDSO_ECTG_USER(4),4
- tml %r5,0x4000
- jo 11f
- tml %r5,0x8000
- jno 10f
- sacf 256
- j 11f
-10: sacf 0
-11: sar %a4,%r2
+ sacf 0
algr %r1,%r0 /* r1 = cputime as TOD value */
mghi %r1,1000 /* convert to nanoseconds */
srlg %r1,%r1,12 /* r1 = cputime in nanosec */
diff --git a/arch/s390/kernel/vdso64/getcpu.S b/arch/s390/kernel/vdso64/getcpu.S
index 43983764b959..e9c34364d97b 100644
--- a/arch/s390/kernel/vdso64/getcpu.S
+++ b/arch/s390/kernel/vdso64/getcpu.S
@@ -15,22 +15,11 @@
.type __kernel_getcpu,@function
__kernel_getcpu:
.cfi_startproc
- ear %r1,%a4
- llilh %r4,0x0100
- sar %a4,%r4
la %r4,0
- epsw %r0,0
- sacf 512
+ sacf 256
l %r5,__VDSO_CPU_NR(%r4)
l %r4,__VDSO_NODE_ID(%r4)
- tml %r0,0x4000
- jo 1f
- tml %r0,0x8000
- jno 0f
- sacf 256
- j 1f
-0: sacf 0
-1: sar %a4,%r1
+ sacf 0
ltgr %r2,%r2
jz 2f
st %r5,0(%r2)
diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c
index 84c0faeaf7ea..30a7c8c29964 100644
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -78,7 +78,7 @@ static inline int arch_load_niai4(int *lock)
ALTERNATIVE("", ".long 0xb2fa0040", 49) /* NIAI 4 */
" l %0,%1\n"
: "=d" (owner) : "Q" (*lock) : "memory");
- return owner;
+ return owner;
}
static inline int arch_cmpxchg_niai8(int *lock, int old, int new)
@@ -226,9 +226,10 @@ static inline void arch_spin_lock_classic(arch_spinlock_t *lp)
/* Try to get the lock if it is free. */
if (!owner) {
new = (old & _Q_TAIL_MASK) | lockval;
- if (arch_cmpxchg_niai8(&lp->lock, old, new))
+ if (arch_cmpxchg_niai8(&lp->lock, old, new)) {
/* Got the lock */
- return;
+ return;
+ }
continue;
}
if (count-- >= 0)
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 802903c50de1..cae5a1e16cbd 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -40,10 +40,67 @@ static inline int copy_with_mvcos(void)
}
#endif
+void set_fs(mm_segment_t fs)
+{
+ current->thread.mm_segment = fs;
+ if (fs == USER_DS) {
+ __ctl_load(S390_lowcore.user_asce, 1, 1);
+ clear_cpu_flag(CIF_ASCE_PRIMARY);
+ } else {
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ set_cpu_flag(CIF_ASCE_PRIMARY);
+ }
+ if (fs & 1) {
+ if (fs == USER_DS_SACF)
+ __ctl_load(S390_lowcore.user_asce, 7, 7);
+ else
+ __ctl_load(S390_lowcore.kernel_asce, 7, 7);
+ set_cpu_flag(CIF_ASCE_SECONDARY);
+ }
+}
+EXPORT_SYMBOL(set_fs);
+
+mm_segment_t enable_sacf_uaccess(void)
+{
+ mm_segment_t old_fs;
+ unsigned long asce, cr;
+
+ old_fs = current->thread.mm_segment;
+ if (old_fs & 1)
+ return old_fs;
+ current->thread.mm_segment |= 1;
+ asce = S390_lowcore.kernel_asce;
+ if (likely(old_fs == USER_DS)) {
+ __ctl_store(cr, 1, 1);
+ if (cr != S390_lowcore.kernel_asce) {
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ set_cpu_flag(CIF_ASCE_PRIMARY);
+ }
+ asce = S390_lowcore.user_asce;
+ }
+ __ctl_store(cr, 7, 7);
+ if (cr != asce) {
+ __ctl_load(asce, 7, 7);
+ set_cpu_flag(CIF_ASCE_SECONDARY);
+ }
+ return old_fs;
+}
+EXPORT_SYMBOL(enable_sacf_uaccess);
+
+void disable_sacf_uaccess(mm_segment_t old_fs)
+{
+ if (old_fs == USER_DS && test_facility(27)) {
+ __ctl_load(S390_lowcore.user_asce, 1, 1);
+ clear_cpu_flag(CIF_ASCE_PRIMARY);
+ }
+ current->thread.mm_segment = old_fs;
+}
+EXPORT_SYMBOL(disable_sacf_uaccess);
+
static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr,
unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x81UL;
+ register unsigned long reg0 asm("0") = 0x01UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -74,8 +131,9 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
unsigned long size)
{
unsigned long tmp1, tmp2;
+ mm_segment_t old_fs;
- load_kernel_asce();
+ old_fs = enable_sacf_uaccess();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
@@ -102,6 +160,7 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
+ disable_sacf_uaccess(old_fs);
return size;
}
@@ -116,7 +175,7 @@ EXPORT_SYMBOL(raw_copy_from_user);
static inline unsigned long copy_to_user_mvcos(void __user *ptr, const void *x,
unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x810000UL;
+ register unsigned long reg0 asm("0") = 0x010000UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -147,8 +206,9 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
unsigned long size)
{
unsigned long tmp1, tmp2;
+ mm_segment_t old_fs;
- load_kernel_asce();
+ old_fs = enable_sacf_uaccess();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
@@ -175,6 +235,7 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
+ disable_sacf_uaccess(old_fs);
return size;
}
@@ -189,7 +250,7 @@ EXPORT_SYMBOL(raw_copy_to_user);
static inline unsigned long copy_in_user_mvcos(void __user *to, const void __user *from,
unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x810081UL;
+ register unsigned long reg0 asm("0") = 0x010001UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -212,9 +273,10 @@ static inline unsigned long copy_in_user_mvcos(void __user *to, const void __use
static inline unsigned long copy_in_user_mvc(void __user *to, const void __user *from,
unsigned long size)
{
+ mm_segment_t old_fs;
unsigned long tmp1;
- load_kernel_asce();
+ old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
" aghi %0,-1\n"
@@ -238,6 +300,7 @@ static inline unsigned long copy_in_user_mvc(void __user *to, const void __user
EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
: "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1)
: : "cc", "memory");
+ disable_sacf_uaccess(old_fs);
return size;
}
@@ -251,7 +314,7 @@ EXPORT_SYMBOL(raw_copy_in_user);
static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x810000UL;
+ register unsigned long reg0 asm("0") = 0x010000UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -279,9 +342,10 @@ static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size
static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
{
+ mm_segment_t old_fs;
unsigned long tmp1, tmp2;
- load_kernel_asce();
+ old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
" aghi %0,-1\n"
@@ -310,6 +374,7 @@ static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
: "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
+ disable_sacf_uaccess(old_fs);
return size;
}
@@ -345,10 +410,15 @@ static inline unsigned long strnlen_user_srst(const char __user *src,
unsigned long __strnlen_user(const char __user *src, unsigned long size)
{
+ mm_segment_t old_fs;
+ unsigned long len;
+
if (unlikely(!size))
return 0;
- load_kernel_asce();
- return strnlen_user_srst(src, size);
+ old_fs = enable_sacf_uaccess();
+ len = strnlen_user_srst(src, size);
+ disable_sacf_uaccess(old_fs);
+ return len;
}
EXPORT_SYMBOL(__strnlen_user);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 242b78c0a9ec..93faeca52284 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -50,6 +50,13 @@
#define VM_FAULT_SIGNAL 0x080000
#define VM_FAULT_PFAULT 0x100000
+enum fault_type {
+ KERNEL_FAULT,
+ USER_FAULT,
+ VDSO_FAULT,
+ GMAP_FAULT,
+};
+
static unsigned long store_indication __read_mostly;
static int __init fault_init(void)
@@ -99,27 +106,34 @@ void bust_spinlocks(int yes)
}
/*
- * Returns the address space associated with the fault.
- * Returns 0 for kernel space and 1 for user space.
+ * Find out which address space caused the exception.
+ * Access register mode is impossible, ignore space == 3.
*/
-static inline int user_space_fault(struct pt_regs *regs)
+static inline enum fault_type get_fault_type(struct pt_regs *regs)
{
unsigned long trans_exc_code;
- /*
- * The lowest two bits of the translation exception
- * identification indicate which paging table was used.
- */
trans_exc_code = regs->int_parm_long & 3;
- if (trans_exc_code == 3) /* home space -> kernel */
- return 0;
- if (user_mode(regs))
- return 1;
- if (trans_exc_code == 2) /* secondary space -> set_fs */
- return current->thread.mm_segment.ar4;
- if (current->flags & PF_VCPU)
- return 1;
- return 0;
+ if (likely(trans_exc_code == 0)) {
+ /* primary space exception */
+ if (IS_ENABLED(CONFIG_PGSTE) &&
+ test_pt_regs_flag(regs, PIF_GUEST_FAULT))
+ return GMAP_FAULT;
+ if (current->thread.mm_segment == USER_DS)
+ return USER_FAULT;
+ return KERNEL_FAULT;
+ }
+ if (trans_exc_code == 2) {
+ /* secondary space exception */
+ if (current->thread.mm_segment & 1) {
+ if (current->thread.mm_segment == USER_DS_SACF)
+ return USER_FAULT;
+ return KERNEL_FAULT;
+ }
+ return VDSO_FAULT;
+ }
+ /* home space exception -> access via kernel ASCE */
+ return KERNEL_FAULT;
}
static int bad_address(void *p)
@@ -204,20 +218,23 @@ static void dump_fault_info(struct pt_regs *regs)
break;
}
pr_cont("mode while using ");
- if (!user_space_fault(regs)) {
- asce = S390_lowcore.kernel_asce;
- pr_cont("kernel ");
- }
-#ifdef CONFIG_PGSTE
- else if ((current->flags & PF_VCPU) && S390_lowcore.gmap) {
- struct gmap *gmap = (struct gmap *)S390_lowcore.gmap;
- asce = gmap->asce;
- pr_cont("gmap ");
- }
-#endif
- else {
+ switch (get_fault_type(regs)) {
+ case USER_FAULT:
asce = S390_lowcore.user_asce;
pr_cont("user ");
+ break;
+ case VDSO_FAULT:
+ asce = S390_lowcore.vdso_asce;
+ pr_cont("vdso ");
+ break;
+ case GMAP_FAULT:
+ asce = ((struct gmap *) S390_lowcore.gmap)->asce;
+ pr_cont("gmap ");
+ break;
+ case KERNEL_FAULT:
+ asce = S390_lowcore.kernel_asce;
+ pr_cont("kernel ");
+ break;
}
pr_cont("ASCE.\n");
dump_pagetable(asce, regs->int_parm_long & __FAIL_ADDR_MASK);
@@ -273,7 +290,7 @@ static noinline void do_no_context(struct pt_regs *regs)
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
- if (!user_space_fault(regs))
+ if (get_fault_type(regs) == KERNEL_FAULT)
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" in virtual kernel address space\n");
else
@@ -395,12 +412,11 @@ static noinline void do_fault_error(struct pt_regs *regs, int access, int fault)
*/
static inline int do_exception(struct pt_regs *regs, int access)
{
-#ifdef CONFIG_PGSTE
struct gmap *gmap;
-#endif
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct *vma;
+ enum fault_type type;
unsigned long trans_exc_code;
unsigned long address;
unsigned int flags;
@@ -425,8 +441,19 @@ static inline int do_exception(struct pt_regs *regs, int access)
* user context.
*/
fault = VM_FAULT_BADCONTEXT;
- if (unlikely(!user_space_fault(regs) || faulthandler_disabled() || !mm))
+ type = get_fault_type(regs);
+ switch (type) {
+ case KERNEL_FAULT:
+ goto out;
+ case VDSO_FAULT:
+ fault = VM_FAULT_BADMAP;
goto out;
+ case USER_FAULT:
+ case GMAP_FAULT:
+ if (faulthandler_disabled() || !mm)
+ goto out;
+ break;
+ }
address = trans_exc_code & __FAIL_ADDR_MASK;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
@@ -437,10 +464,9 @@ static inline int do_exception(struct pt_regs *regs, int access)
flags |= FAULT_FLAG_WRITE;
down_read(&mm->mmap_sem);
-#ifdef CONFIG_PGSTE
- gmap = (current->flags & PF_VCPU) ?
- (struct gmap *) S390_lowcore.gmap : NULL;
- if (gmap) {
+ gmap = NULL;
+ if (IS_ENABLED(CONFIG_PGSTE) && type == GMAP_FAULT) {
+ gmap = (struct gmap *) S390_lowcore.gmap;
current->thread.gmap_addr = address;
current->thread.gmap_write_flag = !!(flags & FAULT_FLAG_WRITE);
current->thread.gmap_int_code = regs->int_code & 0xffff;
@@ -452,7 +478,6 @@ static inline int do_exception(struct pt_regs *regs, int access)
if (gmap->pfault_enabled)
flags |= FAULT_FLAG_RETRY_NOWAIT;
}
-#endif
retry:
fault = VM_FAULT_BADMAP;
@@ -507,15 +532,14 @@ retry:
regs, address);
}
if (fault & VM_FAULT_RETRY) {
-#ifdef CONFIG_PGSTE
- if (gmap && (flags & FAULT_FLAG_RETRY_NOWAIT)) {
+ if (IS_ENABLED(CONFIG_PGSTE) && gmap &&
+ (flags & FAULT_FLAG_RETRY_NOWAIT)) {
/* FAULT_FLAG_RETRY_NOWAIT has been set,
* mmap_sem has not been released */
current->thread.gmap_pfault = 1;
fault = VM_FAULT_PFAULT;
goto out_up;
}
-#endif
/* Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk
* of starvation. */
flags &= ~(FAULT_FLAG_ALLOW_RETRY |
@@ -525,8 +549,7 @@ retry:
goto retry;
}
}
-#ifdef CONFIG_PGSTE
- if (gmap) {
+ if (IS_ENABLED(CONFIG_PGSTE) && gmap) {
address = __gmap_link(gmap, current->thread.gmap_addr,
address);
if (address == -EFAULT) {
@@ -538,7 +561,6 @@ retry:
goto out_up;
}
}
-#endif
fault = 0;
out_up:
up_read(&mm->mmap_sem);
@@ -706,7 +728,7 @@ static void pfault_interrupt(struct ext_code ext_code,
return;
inc_irq_stat(IRQEXT_PFL);
/* Get the token (= pid of the affected task). */
- pid = param64 & LPP_PFAULT_PID_MASK;
+ pid = param64 & LPP_PID_MASK;
rcu_read_lock();
tsk = find_task_by_pid_ns(pid, &init_pid_ns);
if (tsk)
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 2f66290c9b92..b2c140193b0a 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -1187,12 +1187,11 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
unsigned long *sgt)
{
- unsigned long asce, *pgt;
+ unsigned long *pgt;
struct page *page;
int i;
BUG_ON(!gmap_is_shadow(sg));
- asce = (unsigned long) sgt | _ASCE_TYPE_SEGMENT;
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _SEGMENT_SIZE) {
if (!(sgt[i] & _SEGMENT_ENTRY_ORIGIN))
continue;
@@ -1245,12 +1244,11 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr,
unsigned long *r3t)
{
- unsigned long asce, *sgt;
+ unsigned long *sgt;
struct page *page;
int i;
BUG_ON(!gmap_is_shadow(sg));
- asce = (unsigned long) r3t | _ASCE_TYPE_REGION3;
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION3_SIZE) {
if (!(r3t[i] & _REGION_ENTRY_ORIGIN))
continue;
@@ -1303,12 +1301,11 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
unsigned long *r2t)
{
- unsigned long asce, *r3t;
+ unsigned long *r3t;
struct page *page;
int i;
BUG_ON(!gmap_is_shadow(sg));
- asce = (unsigned long) r2t | _ASCE_TYPE_REGION2;
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION2_SIZE) {
if (!(r2t[i] & _REGION_ENTRY_ORIGIN))
continue;
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 817c9e16e83e..671535e64aba 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -95,6 +95,7 @@ void __init paging_init(void)
}
init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
S390_lowcore.kernel_asce = init_mm.context.asce;
+ S390_lowcore.user_asce = S390_lowcore.kernel_asce;
crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
vmem_map_init();
diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c
index 4ad4c4f77b4d..434a9564917b 100644
--- a/arch/s390/mm/pgalloc.c
+++ b/arch/s390/mm/pgalloc.c
@@ -71,10 +71,8 @@ static void __crst_table_upgrade(void *arg)
{
struct mm_struct *mm = arg;
- if (current->active_mm == mm) {
- clear_user_asce();
+ if (current->active_mm == mm)
set_user_asce(mm);
- }
__tlb_flush_local();
}
diff --git a/arch/s390/tools/Makefile b/arch/s390/tools/Makefile
index 2ebf2872cc16..2e70e25de07a 100644
--- a/arch/s390/tools/Makefile
+++ b/arch/s390/tools/Makefile
@@ -21,4 +21,4 @@ include/generated/facilities.h: $(obj)/gen_facilities FORCE
$(call filechk,facilities.h)
include/generated/dis.h: $(obj)/gen_opcode_table FORCE
- $(call filechk,dis.h,__FUN)
+ $(call filechk,dis.h)