[deliverable/linux.git] / drivers / edac / mce_amd_inj.c

/*
 * 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 (inj_type == SW_INJ) {
		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 >= 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");
Commit	Line	Data
9cdeb404	1	/*
fd19fcd6 BP	2	* A simple MCE injection facility for testing different aspects of the RAS
	3	* code. This driver should be built as module so that it can be loaded
	4	* on production kernels for testing purposes.
9cdeb404 BP	5	*
	6	* This file may be distributed under the terms of the GNU General Public
	7	* License version 2.
	8	*
fd19fcd6	9	* Copyright (c) 2010-14: Borislav Petkov <bp@alien8.de>
9cdeb404 BP	10	* Advanced Micro Devices Inc.
	11	*/
	12
	13	#include <linux/kobject.h>
fd19fcd6	14	#include <linux/debugfs.h>
51990e82	15	#include <linux/device.h>
80a2e2e3	16	#include <linux/module.h>
51756a50	17	#include <linux/cpu.h>
0451d14d AG	18	#include <linux/string.h>
0451d14d AG	19	#include <linux/uaccess.h>
9cdeb404 BP	20	#include <asm/mce.h>
9cdeb404 BP	21
47ca08a4	22	#include "mce_amd.h"
9cdeb404	23
9cdeb404 BP	24	/*
	25	* Collect all the MCi_XXX settings
	26	*/
	27	static struct mce i_mce;
fd19fcd6	28	static struct dentry *dfs_inj;
9cdeb404	29
685d46d7 AG	30	static u8 n_banks;
685d46d7 AG	31
0451d14d AG	32	#define MAX_FLAG_OPT_SIZE 3
	33
	34	enum injection_type {
	35	SW_INJ = 0, /* SW injection, simply decode the error */
	36	HW_INJ, /* Trigger a #MC */
	37	N_INJ_TYPES,
	38	};
	39
	40	static const char * const flags_options[] = {
	41	[SW_INJ] = "sw",
	42	[HW_INJ] = "hw",
	43	NULL
	44	};
	45
	46	/* Set default injection to SW_INJ */
de277678	47	static enum injection_type inj_type = SW_INJ;
0451d14d	48
fd19fcd6 BP	49	#define MCE_INJECT_SET(reg) \
fd19fcd6 BP	50	static int inj_##reg##_set(void *data, u64 val) \
9cdeb404	51	{ \
fd19fcd6	52	struct mce m = (struct mce )data; \
9cdeb404	53	\
fd19fcd6 BP	54	m->reg = val; \
fd19fcd6 BP	55	return 0; \
9cdeb404 BP	56	}
9cdeb404 BP	57
fd19fcd6 BP	58	MCE_INJECT_SET(status);
	59	MCE_INJECT_SET(misc);
	60	MCE_INJECT_SET(addr);
9cdeb404	61
fd19fcd6 BP	62	#define MCE_INJECT_GET(reg) \
fd19fcd6 BP	63	static int inj_##reg##_get(void data, u64 val) \
9cdeb404	64	{ \
fd19fcd6 BP	65	struct mce m = (struct mce )data; \
	66	\
	67	*val = m->reg; \
	68	return 0; \
9cdeb404 BP	69	}
9cdeb404 BP	70
fd19fcd6 BP	71	MCE_INJECT_GET(status);
	72	MCE_INJECT_GET(misc);
	73	MCE_INJECT_GET(addr);
9cdeb404	74
fd19fcd6 BP	75	DEFINE_SIMPLE_ATTRIBUTE(status_fops, inj_status_get, inj_status_set, "%llx\n");
	76	DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n");
	77	DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n");
9cdeb404	78
21690934 BP	79	/*
	80	* Caller needs to be make sure this cpu doesn't disappear
	81	* from under us, i.e.: get_cpu/put_cpu.
	82	*/
	83	static int toggle_hw_mce_inject(unsigned int cpu, bool enable)
	84	{
	85	u32 l, h;
	86	int err;
	87
	88	err = rdmsr_on_cpu(cpu, MSR_K7_HWCR, &l, &h);
	89	if (err) {
	90	pr_err("%s: error reading HWCR\n", __func__);
	91	return err;
	92	}
	93
	94	enable ? (l \|= BIT(18)) : (l &= ~BIT(18));
	95
	96	err = wrmsr_on_cpu(cpu, MSR_K7_HWCR, l, h);
	97	if (err)
	98	pr_err("%s: error writing HWCR\n", __func__);
	99
	100	return err;
	101	}
	102
0451d14d	103	static int __set_inj(const char *buf)
b18f3864	104	{
0451d14d AG	105	int i;
	106
	107	for (i = 0; i < N_INJ_TYPES; i++) {
	108	if (!strncmp(flags_options[i], buf, strlen(flags_options[i]))) {
	109	inj_type = i;
	110	return 0;
	111	}
	112	}
	113	return -EINVAL;
	114	}
	115
	116	static ssize_t flags_read(struct file filp, char __user ubuf,
	117	size_t cnt, loff_t *ppos)
	118	{
	119	char buf[MAX_FLAG_OPT_SIZE];
	120	int n;
b18f3864	121
0451d14d	122	n = sprintf(buf, "%s\n", flags_options[inj_type]);
b18f3864	123
0451d14d	124	return simple_read_from_buffer(ubuf, cnt, ppos, buf, n);
b18f3864 BP	125	}
b18f3864 BP	126
0451d14d AG	127	static ssize_t flags_write(struct file filp, const char __user ubuf,
0451d14d AG	128	size_t cnt, loff_t *ppos)
b18f3864	129	{
0451d14d AG	130	char buf[MAX_FLAG_OPT_SIZE], *__buf;
	131	int err;
	132	size_t ret;
b18f3864	133
0451d14d AG	134	if (cnt > MAX_FLAG_OPT_SIZE)
	135	cnt = MAX_FLAG_OPT_SIZE;
	136
	137	ret = cnt;
	138
	139	if (copy_from_user(&buf, ubuf, cnt))
	140	return -EFAULT;
	141
	142	buf[cnt - 1] = 0;
	143
	144	/* strip whitespace */
	145	__buf = strstrip(buf);
	146
	147	err = __set_inj(__buf);
	148	if (err) {
	149	pr_err("%s: Invalid flags value: %s\n", __func__, __buf);
	150	return err;
	151	}
	152
	153	*ppos += ret;
	154
	155	return ret;
b18f3864 BP	156	}
b18f3864 BP	157
0451d14d AG	158	static const struct file_operations flags_fops = {
	159	.read = flags_read,
	160	.write = flags_write,
	161	.llseek = generic_file_llseek,
	162	};
b18f3864 BP	163
	164	/*
	165	* On which CPU to inject?
	166	*/
	167	MCE_INJECT_GET(extcpu);
	168
	169	static int inj_extcpu_set(void *data, u64 val)
	170	{
	171	struct mce m = (struct mce )data;
	172
	173	if (val >= nr_cpu_ids \|\| !cpu_online(val)) {
	174	pr_err("%s: Invalid CPU: %llu\n", __func__, val);
	175	return -EINVAL;
	176	}
	177	m->extcpu = val;
	178	return 0;
	179	}
	180
	181	DEFINE_SIMPLE_ATTRIBUTE(extcpu_fops, inj_extcpu_get, inj_extcpu_set, "%llu\n");
	182
51756a50 BP	183	static void trigger_mce(void *info)
	184	{
	185	asm volatile("int $18");
	186	}
	187
	188	static void do_inject(void)
	189	{
	190	u64 mcg_status = 0;
	191	unsigned int cpu = i_mce.extcpu;
	192	u8 b = i_mce.bank;
	193
0451d14d	194	if (inj_type == SW_INJ) {
51756a50 BP	195	amd_decode_mce(NULL, 0, &i_mce);
	196	return;
	197	}
	198
	199	get_online_cpus();
	200	if (!cpu_online(cpu))
	201	goto err;
	202
	203	/* prep MCE global settings for the injection */
	204	mcg_status = MCG_STATUS_MCIP \| MCG_STATUS_EIPV;
	205
	206	if (!(i_mce.status & MCI_STATUS_PCC))
	207	mcg_status \|= MCG_STATUS_RIPV;
	208
	209	toggle_hw_mce_inject(cpu, true);
	210
	211	wrmsr_on_cpu(cpu, MSR_IA32_MCG_STATUS,
	212	(u32)mcg_status, (u32)(mcg_status >> 32));
	213
	214	wrmsr_on_cpu(cpu, MSR_IA32_MCx_STATUS(b),
	215	(u32)i_mce.status, (u32)(i_mce.status >> 32));
	216
	217	wrmsr_on_cpu(cpu, MSR_IA32_MCx_ADDR(b),
	218	(u32)i_mce.addr, (u32)(i_mce.addr >> 32));
	219
	220	wrmsr_on_cpu(cpu, MSR_IA32_MCx_MISC(b),
	221	(u32)i_mce.misc, (u32)(i_mce.misc >> 32));
	222
	223	toggle_hw_mce_inject(cpu, false);
	224
	225	smp_call_function_single(cpu, trigger_mce, NULL, 0);
	226
	227	err:
	228	put_online_cpus();
	229
	230	}
	231
9cdeb404 BP	232	/*
	233	* This denotes into which bank we're injecting and triggers
	234	* the injection, at the same time.
	235	*/
fd19fcd6	236	static int inj_bank_set(void *data, u64 val)
9cdeb404	237	{
fd19fcd6	238	struct mce m = (struct mce )data;
9cdeb404	239
685d46d7 AG	240	if (val >= n_banks) {
	241	pr_err("Non-existent MCE bank: %llu\n", val);
	242	return -EINVAL;
fd19fcd6	243	}
9cdeb404	244
fd19fcd6	245	m->bank = val;
51756a50	246	do_inject();
9cdeb404	247
fd19fcd6	248	return 0;
9cdeb404 BP	249	}
9cdeb404 BP	250
e7f2ea1d	251	MCE_INJECT_GET(bank);
9cdeb404	252
fd19fcd6 BP	253	DEFINE_SIMPLE_ATTRIBUTE(bank_fops, inj_bank_get, inj_bank_set, "%llu\n");
fd19fcd6 BP	254
99e21fea	255	static const char readme_msg[] =
f2f3dca1 BP	256	"Description of the files and their usages:\n"
	257	"\n"
	258	"Note1: i refers to the bank number below.\n"
	259	"Note2: See respective BKDGs for the exact bit definitions of the files below\n"
	260	"as they mirror the hardware registers.\n"
	261	"\n"
	262	"status:\t Set MCi_STATUS: the bits in that MSR control the error type and\n"
	263	"\t attributes of the error which caused the MCE.\n"
	264	"\n"
	265	"misc:\t Set MCi_MISC: provide auxiliary info about the error. It is mostly\n"
	266	"\t used for error thresholding purposes and its validity is indicated by\n"
	267	"\t MCi_STATUS[MiscV].\n"
	268	"\n"
	269	"addr:\t Error address value to be written to MCi_ADDR. Log address information\n"
	270	"\t associated with the error.\n"
	271	"\n"
	272	"cpu:\t The CPU to inject the error on.\n"
	273	"\n"
	274	"bank:\t Specify the bank you want to inject the error into: the number of\n"
	275	"\t banks in a processor varies and is family/model-specific, therefore, the\n"
	276	"\t supplied value is sanity-checked. Setting the bank value also triggers the\n"
	277	"\t injection.\n"
	278	"\n"
	279	"flags:\t Injection type to be performed. Writing to this file will trigger a\n"
	280	"\t real machine check, an APIC interrupt or invoke the error decoder routines\n"
	281	"\t for AMD processors.\n"
	282	"\n"
	283	"\t Allowed error injection types:\n"
	284	"\t - \"sw\": Software error injection. Decode error to a human-readable \n"
	285	"\t format only. Safe to use.\n"
	286	"\t - \"hw\": Hardware error injection. Causes the #MC exception handler to \n"
	287	"\t handle the error. Be warned: might cause system panic if MCi_STATUS[PCC] \n"
	288	"\t is set. Therefore, consider setting (debugfs_mountpoint)/mce/fake_panic \n"
	289	"\t before injecting.\n"
	290	"\n";
99e21fea AG	291
	292	static ssize_t
	293	inj_readme_read(struct file filp, char __user ubuf,
	294	size_t cnt, loff_t *ppos)
	295	{
	296	return simple_read_from_buffer(ubuf, cnt, ppos,
	297	readme_msg, strlen(readme_msg));
	298	}
	299
	300	static const struct file_operations readme_fops = {
	301	.read = inj_readme_read,
	302	};
	303
8c2b117f	304	static struct dfs_node {
fd19fcd6 BP	305	char *name;
	306	struct dentry *d;
	307	const struct file_operations *fops;
4c6034e8	308	umode_t perm;
fd19fcd6	309	} dfs_fls[] = {
4c6034e8 AG	310	{ .name = "status", .fops = &status_fops, .perm = S_IRUSR \| S_IWUSR },
	311	{ .name = "misc", .fops = &misc_fops, .perm = S_IRUSR \| S_IWUSR },
	312	{ .name = "addr", .fops = &addr_fops, .perm = S_IRUSR \| S_IWUSR },
	313	{ .name = "bank", .fops = &bank_fops, .perm = S_IRUSR \| S_IWUSR },
	314	{ .name = "flags", .fops = &flags_fops, .perm = S_IRUSR \| S_IWUSR },
	315	{ .name = "cpu", .fops = &extcpu_fops, .perm = S_IRUSR \| S_IWUSR },
99e21fea	316	{ .name = "README", .fops = &readme_fops, .perm = S_IRUSR \| S_IRGRP \| S_IROTH },
9cdeb404 BP	317	};
9cdeb404 BP	318
fd19fcd6	319	static int __init init_mce_inject(void)
9cdeb404	320	{
fd19fcd6	321	int i;
685d46d7 AG	322	u64 cap;
	323
	324	rdmsrl(MSR_IA32_MCG_CAP, cap);
	325	n_banks = cap & MCG_BANKCNT_MASK;
9cdeb404	326
fd19fcd6 BP	327	dfs_inj = debugfs_create_dir("mce-inject", NULL);
fd19fcd6 BP	328	if (!dfs_inj)
9cdeb404 BP	329	return -EINVAL;
9cdeb404 BP	330
fd19fcd6 BP	331	for (i = 0; i < ARRAY_SIZE(dfs_fls); i++) {
fd19fcd6 BP	332	dfs_fls[i].d = debugfs_create_file(dfs_fls[i].name,
4c6034e8	333	dfs_fls[i].perm,
fd19fcd6 BP	334	dfs_inj,
	335	&i_mce,
	336	dfs_fls[i].fops);
9cdeb404	337
fd19fcd6 BP	338	if (!dfs_fls[i].d)
fd19fcd6 BP	339	goto err_dfs_add;
9cdeb404	340	}
fd19fcd6	341
9cdeb404 BP	342	return 0;
9cdeb404 BP	343
fd19fcd6	344	err_dfs_add:
df4b2a30	345	while (--i >= 0)
fd19fcd6	346	debugfs_remove(dfs_fls[i].d);
9cdeb404	347
fd19fcd6 BP	348	debugfs_remove(dfs_inj);
fd19fcd6 BP	349	dfs_inj = NULL;
9cdeb404	350
fd19fcd6	351	return -ENOMEM;
9cdeb404 BP	352	}
9cdeb404 BP	353
fd19fcd6	354	static void __exit exit_mce_inject(void)
9cdeb404 BP	355	{
	356	int i;
	357
fd19fcd6 BP	358	for (i = 0; i < ARRAY_SIZE(dfs_fls); i++)
fd19fcd6 BP	359	debugfs_remove(dfs_fls[i].d);
9cdeb404	360
fd19fcd6	361	memset(&dfs_fls, 0, sizeof(dfs_fls));
9cdeb404	362
fd19fcd6 BP	363	debugfs_remove(dfs_inj);
fd19fcd6 BP	364	dfs_inj = NULL;
9cdeb404	365	}
fd19fcd6 BP	366	module_init(init_mce_inject);
fd19fcd6 BP	367	module_exit(exit_mce_inject);
9cdeb404 BP	368
9cdeb404 BP	369	MODULE_LICENSE("GPL");
43aff26c	370	MODULE_AUTHOR("Borislav Petkov <bp@alien8.de>");
9cdeb404	371	MODULE_AUTHOR("AMD Inc.");
fd19fcd6	372	MODULE_DESCRIPTION("MCE injection facility for RAS testing");