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authorBorislav Petkov <bp@suse.de>2015-08-12 18:29:45 +0200
committerIngo Molnar <mingo@kernel.org>2015-08-13 10:12:54 +0200
commit6c36dfe949187dc2729abfad4b083758ac5c2e0e (patch)
tree6a02eb129899cf9c58514a7a7b22075d310ccdf1 /drivers/edac/mce_amd_inj.c
parenta79da38494ec23f1a7d6ee734e07e9575fd18b58 (diff)
downloadlinux-6c36dfe949187dc2729abfad4b083758ac5c2e0e.tar.bz2
x86/ras: Move AMD MCE injector to arch/x86/ras/
This is an x86-specific module and would benefit from being closer to the arch code. Move it there. Update copyright while at it. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/1439396985-12812-14-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/edac/mce_amd_inj.c')
-rw-r--r--drivers/edac/mce_amd_inj.c375
1 files changed, 0 insertions, 375 deletions
diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c
deleted file mode 100644
index 4c73e4d03d46..000000000000
--- a/drivers/edac/mce_amd_inj.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * A simple MCE injection facility for testing different aspects of the RAS
- * code. This driver should be built as module so that it can be loaded
- * on production kernels for testing purposes.
- *
- * This file may be distributed under the terms of the GNU General Public
- * License version 2.
- *
- * Copyright (c) 2010-14: Borislav Petkov <bp@alien8.de>
- * Advanced Micro Devices Inc.
- */
-
-#include <linux/kobject.h>
-#include <linux/debugfs.h>
-#include <linux/device.h>
-#include <linux/module.h>
-#include <linux/cpu.h>
-#include <linux/string.h>
-#include <linux/uaccess.h>
-#include <asm/mce.h>
-
-#include "mce_amd.h"
-
-/*
- * Collect all the MCi_XXX settings
- */
-static struct mce i_mce;
-static struct dentry *dfs_inj;
-
-static u8 n_banks;
-
-#define MAX_FLAG_OPT_SIZE 3
-
-enum injection_type {
- SW_INJ = 0, /* SW injection, simply decode the error */
- HW_INJ, /* Trigger a #MC */
- N_INJ_TYPES,
-};
-
-static const char * const flags_options[] = {
- [SW_INJ] = "sw",
- [HW_INJ] = "hw",
- NULL
-};
-
-/* Set default injection to SW_INJ */
-static enum injection_type inj_type = SW_INJ;
-
-#define MCE_INJECT_SET(reg) \
-static int inj_##reg##_set(void *data, u64 val) \
-{ \
- struct mce *m = (struct mce *)data; \
- \
- m->reg = val; \
- return 0; \
-}
-
-MCE_INJECT_SET(status);
-MCE_INJECT_SET(misc);
-MCE_INJECT_SET(addr);
-
-#define MCE_INJECT_GET(reg) \
-static int inj_##reg##_get(void *data, u64 *val) \
-{ \
- struct mce *m = (struct mce *)data; \
- \
- *val = m->reg; \
- return 0; \
-}
-
-MCE_INJECT_GET(status);
-MCE_INJECT_GET(misc);
-MCE_INJECT_GET(addr);
-
-DEFINE_SIMPLE_ATTRIBUTE(status_fops, inj_status_get, inj_status_set, "%llx\n");
-DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n");
-DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n");
-
-/*
- * Caller needs to be make sure this cpu doesn't disappear
- * from under us, i.e.: get_cpu/put_cpu.
- */
-static int toggle_hw_mce_inject(unsigned int cpu, bool enable)
-{
- u32 l, h;
- int err;
-
- err = rdmsr_on_cpu(cpu, MSR_K7_HWCR, &l, &h);
- if (err) {
- pr_err("%s: error reading HWCR\n", __func__);
- return err;
- }
-
- enable ? (l |= BIT(18)) : (l &= ~BIT(18));
-
- err = wrmsr_on_cpu(cpu, MSR_K7_HWCR, l, h);
- if (err)
- pr_err("%s: error writing HWCR\n", __func__);
-
- return err;
-}
-
-static int __set_inj(const char *buf)
-{
- int i;
-
- for (i = 0; i < N_INJ_TYPES; i++) {
- if (!strncmp(flags_options[i], buf, strlen(flags_options[i]))) {
- inj_type = i;
- return 0;
- }
- }
- return -EINVAL;
-}
-
-static ssize_t flags_read(struct file *filp, char __user *ubuf,
- size_t cnt, loff_t *ppos)
-{
- char buf[MAX_FLAG_OPT_SIZE];
- int n;
-
- n = sprintf(buf, "%s\n", flags_options[inj_type]);
-
- return simple_read_from_buffer(ubuf, cnt, ppos, buf, n);
-}
-
-static ssize_t flags_write(struct file *filp, const char __user *ubuf,
- size_t cnt, loff_t *ppos)
-{
- char buf[MAX_FLAG_OPT_SIZE], *__buf;
- int err;
- size_t ret;
-
- if (cnt > MAX_FLAG_OPT_SIZE)
- cnt = MAX_FLAG_OPT_SIZE;
-
- ret = cnt;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt - 1] = 0;
-
- /* strip whitespace */
- __buf = strstrip(buf);
-
- err = __set_inj(__buf);
- if (err) {
- pr_err("%s: Invalid flags value: %s\n", __func__, __buf);
- return err;
- }
-
- *ppos += ret;
-
- return ret;
-}
-
-static const struct file_operations flags_fops = {
- .read = flags_read,
- .write = flags_write,
- .llseek = generic_file_llseek,
-};
-
-/*
- * On which CPU to inject?
- */
-MCE_INJECT_GET(extcpu);
-
-static int inj_extcpu_set(void *data, u64 val)
-{
- struct mce *m = (struct mce *)data;
-
- if (val >= nr_cpu_ids || !cpu_online(val)) {
- pr_err("%s: Invalid CPU: %llu\n", __func__, val);
- return -EINVAL;
- }
- m->extcpu = val;
- return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(extcpu_fops, inj_extcpu_get, inj_extcpu_set, "%llu\n");
-
-static void trigger_mce(void *info)
-{
- asm volatile("int $18");
-}
-
-static void do_inject(void)
-{
- u64 mcg_status = 0;
- unsigned int cpu = i_mce.extcpu;
- u8 b = i_mce.bank;
-
- if (i_mce.misc)
- i_mce.status |= MCI_STATUS_MISCV;
-
- if (inj_type == SW_INJ) {
- amd_decode_mce(NULL, 0, &i_mce);
- return;
- }
-
- /* prep MCE global settings for the injection */
- mcg_status = MCG_STATUS_MCIP | MCG_STATUS_EIPV;
-
- if (!(i_mce.status & MCI_STATUS_PCC))
- mcg_status |= MCG_STATUS_RIPV;
-
- get_online_cpus();
- if (!cpu_online(cpu))
- goto err;
-
- toggle_hw_mce_inject(cpu, true);
-
- wrmsr_on_cpu(cpu, MSR_IA32_MCG_STATUS,
- (u32)mcg_status, (u32)(mcg_status >> 32));
-
- wrmsr_on_cpu(cpu, MSR_IA32_MCx_STATUS(b),
- (u32)i_mce.status, (u32)(i_mce.status >> 32));
-
- wrmsr_on_cpu(cpu, MSR_IA32_MCx_ADDR(b),
- (u32)i_mce.addr, (u32)(i_mce.addr >> 32));
-
- wrmsr_on_cpu(cpu, MSR_IA32_MCx_MISC(b),
- (u32)i_mce.misc, (u32)(i_mce.misc >> 32));
-
- toggle_hw_mce_inject(cpu, false);
-
- smp_call_function_single(cpu, trigger_mce, NULL, 0);
-
-err:
- put_online_cpus();
-
-}
-
-/*
- * This denotes into which bank we're injecting and triggers
- * the injection, at the same time.
- */
-static int inj_bank_set(void *data, u64 val)
-{
- struct mce *m = (struct mce *)data;
-
- if (val >= n_banks) {
- pr_err("Non-existent MCE bank: %llu\n", val);
- return -EINVAL;
- }
-
- m->bank = val;
- do_inject();
-
- return 0;
-}
-
-MCE_INJECT_GET(bank);
-
-DEFINE_SIMPLE_ATTRIBUTE(bank_fops, inj_bank_get, inj_bank_set, "%llu\n");
-
-static const char readme_msg[] =
-"Description of the files and their usages:\n"
-"\n"
-"Note1: i refers to the bank number below.\n"
-"Note2: See respective BKDGs for the exact bit definitions of the files below\n"
-"as they mirror the hardware registers.\n"
-"\n"
-"status:\t Set MCi_STATUS: the bits in that MSR control the error type and\n"
-"\t attributes of the error which caused the MCE.\n"
-"\n"
-"misc:\t Set MCi_MISC: provide auxiliary info about the error. It is mostly\n"
-"\t used for error thresholding purposes and its validity is indicated by\n"
-"\t MCi_STATUS[MiscV].\n"
-"\n"
-"addr:\t Error address value to be written to MCi_ADDR. Log address information\n"
-"\t associated with the error.\n"
-"\n"
-"cpu:\t The CPU to inject the error on.\n"
-"\n"
-"bank:\t Specify the bank you want to inject the error into: the number of\n"
-"\t banks in a processor varies and is family/model-specific, therefore, the\n"
-"\t supplied value is sanity-checked. Setting the bank value also triggers the\n"
-"\t injection.\n"
-"\n"
-"flags:\t Injection type to be performed. Writing to this file will trigger a\n"
-"\t real machine check, an APIC interrupt or invoke the error decoder routines\n"
-"\t for AMD processors.\n"
-"\n"
-"\t Allowed error injection types:\n"
-"\t - \"sw\": Software error injection. Decode error to a human-readable \n"
-"\t format only. Safe to use.\n"
-"\t - \"hw\": Hardware error injection. Causes the #MC exception handler to \n"
-"\t handle the error. Be warned: might cause system panic if MCi_STATUS[PCC] \n"
-"\t is set. Therefore, consider setting (debugfs_mountpoint)/mce/fake_panic \n"
-"\t before injecting.\n"
-"\n";
-
-static ssize_t
-inj_readme_read(struct file *filp, char __user *ubuf,
- size_t cnt, loff_t *ppos)
-{
- return simple_read_from_buffer(ubuf, cnt, ppos,
- readme_msg, strlen(readme_msg));
-}
-
-static const struct file_operations readme_fops = {
- .read = inj_readme_read,
-};
-
-static struct dfs_node {
- char *name;
- struct dentry *d;
- const struct file_operations *fops;
- umode_t perm;
-} dfs_fls[] = {
- { .name = "status", .fops = &status_fops, .perm = S_IRUSR | S_IWUSR },
- { .name = "misc", .fops = &misc_fops, .perm = S_IRUSR | S_IWUSR },
- { .name = "addr", .fops = &addr_fops, .perm = S_IRUSR | S_IWUSR },
- { .name = "bank", .fops = &bank_fops, .perm = S_IRUSR | S_IWUSR },
- { .name = "flags", .fops = &flags_fops, .perm = S_IRUSR | S_IWUSR },
- { .name = "cpu", .fops = &extcpu_fops, .perm = S_IRUSR | S_IWUSR },
- { .name = "README", .fops = &readme_fops, .perm = S_IRUSR | S_IRGRP | S_IROTH },
-};
-
-static int __init init_mce_inject(void)
-{
- int i;
- u64 cap;
-
- rdmsrl(MSR_IA32_MCG_CAP, cap);
- n_banks = cap & MCG_BANKCNT_MASK;
-
- dfs_inj = debugfs_create_dir("mce-inject", NULL);
- if (!dfs_inj)
- return -EINVAL;
-
- for (i = 0; i < ARRAY_SIZE(dfs_fls); i++) {
- dfs_fls[i].d = debugfs_create_file(dfs_fls[i].name,
- dfs_fls[i].perm,
- dfs_inj,
- &i_mce,
- dfs_fls[i].fops);
-
- if (!dfs_fls[i].d)
- goto err_dfs_add;
- }
-
- return 0;
-
-err_dfs_add:
- while (--i >= 0)
- debugfs_remove(dfs_fls[i].d);
-
- debugfs_remove(dfs_inj);
- dfs_inj = NULL;
-
- return -ENOMEM;
-}
-
-static void __exit exit_mce_inject(void)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(dfs_fls); i++)
- debugfs_remove(dfs_fls[i].d);
-
- memset(&dfs_fls, 0, sizeof(dfs_fls));
-
- debugfs_remove(dfs_inj);
- dfs_inj = NULL;
-}
-module_init(init_mce_inject);
-module_exit(exit_mce_inject);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Borislav Petkov <bp@alien8.de>");
-MODULE_AUTHOR("AMD Inc.");
-MODULE_DESCRIPTION("MCE injection facility for RAS testing");