diff options
Diffstat (limited to 'kernel/drivers/edac/mce_amd_inj.c')
| -rw-r--r-- | kernel/drivers/edac/mce_amd_inj.c | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/kernel/drivers/edac/mce_amd_inj.c b/kernel/drivers/edac/mce_amd_inj.c deleted file mode 100644 index f7681b553..000000000 --- a/kernel/drivers/edac/mce_amd_inj.c +++ /dev/null @@ -1,262 +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 <asm/mce.h> - -#include "mce_amd.h" - -/* - * Collect all the MCi_XXX settings - */ -static struct mce i_mce; -static struct dentry *dfs_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 flags_get(void *data, u64 *val) -{ - struct mce *m = (struct mce *)data; - - *val = m->inject_flags; - - return 0; -} - -static int flags_set(void *data, u64 val) -{ - struct mce *m = (struct mce *)data; - - m->inject_flags = (u8)val; - return 0; -} - -DEFINE_SIMPLE_ATTRIBUTE(flags_fops, flags_get, flags_set, "%llu\n"); - -/* - * 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.inject_flags & MCJ_EXCEPTION)) { - amd_decode_mce(NULL, 0, &i_mce); - return; - } - - get_online_cpus(); - if (!cpu_online(cpu)) - goto err; - - /* 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; - - 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 > 5) { - if (boot_cpu_data.x86 != 0x15 || val > 6) { - pr_err("Non-existent MCE bank: %llu\n", val); - return -EINVAL; - } - } - - m->bank = val; - do_inject(); - - return 0; -} - -static int inj_bank_get(void *data, u64 *val) -{ - struct mce *m = (struct mce *)data; - - *val = m->bank; - return 0; -} - -DEFINE_SIMPLE_ATTRIBUTE(bank_fops, inj_bank_get, inj_bank_set, "%llu\n"); - -static struct dfs_node { - char *name; - struct dentry *d; - const struct file_operations *fops; -} dfs_fls[] = { - { .name = "status", .fops = &status_fops }, - { .name = "misc", .fops = &misc_fops }, - { .name = "addr", .fops = &addr_fops }, - { .name = "bank", .fops = &bank_fops }, - { .name = "flags", .fops = &flags_fops }, - { .name = "cpu", .fops = &extcpu_fops }, -}; - -static int __init init_mce_inject(void) -{ - int i; - - 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, - S_IRUSR | S_IWUSR, - 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"); |