[linux-2.6-block.git] / drivers / acpi / acpi_extlog.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Extended Error Log driver
 *
 * Copyright (C) 2013 Intel Corp.
 * Author: Chen, Gong <gong.chen@intel.com>
 */

#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/cper.h>
#include <linux/ratelimit.h>
#include <linux/edac.h>
#include <linux/ras.h>
#include <asm/cpu.h>
#include <asm/mce.h>

#include "apei/apei-internal.h"
#include <ras/ras_event.h>

#define EXT_ELOG_ENTRY_MASK	GENMASK_ULL(51, 0) /* elog entry address mask */

#define EXTLOG_DSM_REV		0x0
#define	EXTLOG_FN_ADDR		0x1

#define FLAG_OS_OPTIN		BIT(0)
#define ELOG_ENTRY_VALID	(1ULL<<63)
#define ELOG_ENTRY_LEN		0x1000

#define EMCA_BUG \
	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"

struct extlog_l1_head {
	u32 ver;	/* Header Version */
	u32 hdr_len;	/* Header Length */
	u64 total_len;	/* entire L1 Directory length including this header */
	u64 elog_base;	/* MCA Error Log Directory base address */
	u64 elog_len;	/* MCA Error Log Directory length */
	u32 flags;	/* bit 0 - OS/VMM Opt-in */
	u8  rev0[12];
	u32 entries;	/* Valid L1 Directory entries per logical processor */
	u8  rev1[12];
};

static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295";

/* L1 table related physical address */
static u64 elog_base;
static size_t elog_size;
static u64 l1_dirbase;
static size_t l1_size;

/* L1 table related virtual address */
static void __iomem *extlog_l1_addr;
static void __iomem *elog_addr;

static void *elog_buf;

static u64 *l1_entry_base;
static u32 l1_percpu_entry;

#define ELOG_IDX(cpu, bank) \
	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))

#define ELOG_ENTRY_DATA(idx) \
	(*(l1_entry_base + (idx)))

#define ELOG_ENTRY_ADDR(phyaddr) \
	(phyaddr - elog_base + (u8 *)elog_addr)

static struct acpi_hest_generic_status *extlog_elog_entry_check(int cpu, int bank)
{
	int idx;
	u64 data;
	struct acpi_hest_generic_status *estatus;

	WARN_ON(cpu < 0);
	idx = ELOG_IDX(cpu, bank);
	data = ELOG_ENTRY_DATA(idx);
	if ((data & ELOG_ENTRY_VALID) == 0)
		return NULL;

	data &= EXT_ELOG_ENTRY_MASK;
	estatus = (struct acpi_hest_generic_status *)ELOG_ENTRY_ADDR(data);

	/* if no valid data in elog entry, just return */
	if (estatus->block_status == 0)
		return NULL;

	return estatus;
}

static void __print_extlog_rcd(const char *pfx,
			       struct acpi_hest_generic_status *estatus, int cpu)
{
	static atomic_t seqno;
	unsigned int curr_seqno;
	char pfx_seq[64];

	if (!pfx) {
		if (estatus->error_severity <= CPER_SEV_CORRECTED)
			pfx = KERN_INFO;
		else
			pfx = KERN_ERR;
	}
	curr_seqno = atomic_inc_return(&seqno);
	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
	cper_estatus_print(pfx_seq, estatus);
}

static int print_extlog_rcd(const char *pfx,
			    struct acpi_hest_generic_status *estatus, int cpu)
{
	/* Not more than 2 messages every 5 seconds */
	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
	struct ratelimit_state *ratelimit;

	if (estatus->error_severity == CPER_SEV_CORRECTED ||
	    (estatus->error_severity == CPER_SEV_INFORMATIONAL))
		ratelimit = &ratelimit_corrected;
	else
		ratelimit = &ratelimit_uncorrected;
	if (__ratelimit(ratelimit)) {
		__print_extlog_rcd(pfx, estatus, cpu);
		return 0;
	}

	return 1;
}

static int extlog_print(struct notifier_block *nb, unsigned long val,
			void *data)
{
	struct mce *mce = (struct mce *)data;
	int	bank = mce->bank;
	int	cpu = mce->extcpu;
	struct acpi_hest_generic_status *estatus, *tmp;
	struct acpi_hest_generic_data *gdata;
	const guid_t *fru_id = &guid_null;
	char *fru_text = "";
	guid_t *sec_type;
	static u32 err_seq;

	estatus = extlog_elog_entry_check(cpu, bank);
	if (estatus == NULL || (mce->kflags & MCE_HANDLED_CEC))
		return NOTIFY_DONE;

	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
	/* clear record status to enable BIOS to update it again */
	estatus->block_status = 0;

	tmp = (struct acpi_hest_generic_status *)elog_buf;

	if (!ras_userspace_consumers()) {
		print_extlog_rcd(NULL, tmp, cpu);
		goto out;
	}

	/* log event via trace */
	err_seq++;
	gdata = (struct acpi_hest_generic_data *)(tmp + 1);
	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
		fru_id = (guid_t *)gdata->fru_id;
	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
		fru_text = gdata->fru_text;
	sec_type = (guid_t *)gdata->section_type;
	if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
		struct cper_sec_mem_err *mem = (void *)(gdata + 1);
		if (gdata->error_data_length >= sizeof(*mem))
			trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
					       (u8)gdata->error_severity);
	}

out:
	mce->kflags |= MCE_HANDLED_EXTLOG;
	return NOTIFY_OK;
}

static bool __init extlog_get_l1addr(void)
{
	guid_t guid;
	acpi_handle handle;
	union acpi_object *obj;

	if (guid_parse(extlog_dsm_uuid, &guid))
		return false;
	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
		return false;
	if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
		return false;
	obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV,
				      EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER);
	if (!obj) {
		return false;
	} else {
		l1_dirbase = obj->integer.value;
		ACPI_FREE(obj);
	}

	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
	if (l1_dirbase & ((1 << 12) - 1)) {
		pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
			l1_dirbase);
		return false;
	}

	return true;
}
static struct notifier_block extlog_mce_dec = {
	.notifier_call	= extlog_print,
	.priority	= MCE_PRIO_EXTLOG,
};

static int __init extlog_init(void)
{
	struct extlog_l1_head *l1_head;
	void __iomem *extlog_l1_hdr;
	size_t l1_hdr_size;
	struct resource *r;
	u64 cap;
	int rc;

	if (rdmsrl_safe(MSR_IA32_MCG_CAP, &cap) ||
	    !(cap & MCG_ELOG_P) ||
	    !extlog_get_l1addr())
		return -ENODEV;

	rc = -EINVAL;
	/* get L1 header to fetch necessary information */
	l1_hdr_size = sizeof(struct extlog_l1_head);
	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
	if (!r) {
		pr_warn(FW_BUG EMCA_BUG,
			(unsigned long long)l1_dirbase,
			(unsigned long long)l1_dirbase + l1_hdr_size);
		goto err;
	}

	extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size);
	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
	l1_size = l1_head->total_len;
	l1_percpu_entry = l1_head->entries;
	elog_base = l1_head->elog_base;
	elog_size = l1_head->elog_len;
	acpi_os_unmap_iomem(extlog_l1_hdr, l1_hdr_size);
	release_mem_region(l1_dirbase, l1_hdr_size);

	/* remap L1 header again based on completed information */
	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
	if (!r) {
		pr_warn(FW_BUG EMCA_BUG,
			(unsigned long long)l1_dirbase,
			(unsigned long long)l1_dirbase + l1_size);
		goto err;
	}
	extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size);
	l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size);

	/* remap elog table */
	r = request_mem_region(elog_base, elog_size, "Elog Table");
	if (!r) {
		pr_warn(FW_BUG EMCA_BUG,
			(unsigned long long)elog_base,
			(unsigned long long)elog_base + elog_size);
		goto err_release_l1_dir;
	}
	elog_addr = acpi_os_map_iomem(elog_base, elog_size);

	rc = -ENOMEM;
	/* allocate buffer to save elog record */
	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
	if (elog_buf == NULL)
		goto err_release_elog;

	mce_register_decode_chain(&extlog_mce_dec);
	/* enable OS to be involved to take over management from BIOS */
	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;

	return 0;

err_release_elog:
	if (elog_addr)
		acpi_os_unmap_iomem(elog_addr, elog_size);
	release_mem_region(elog_base, elog_size);
err_release_l1_dir:
	if (extlog_l1_addr)
		acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
	release_mem_region(l1_dirbase, l1_size);
err:
	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
	return rc;
}

static void __exit extlog_exit(void)
{
	mce_unregister_decode_chain(&extlog_mce_dec);
	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
	if (extlog_l1_addr)
		acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
	if (elog_addr)
		acpi_os_unmap_iomem(elog_addr, elog_size);
	release_mem_region(elog_base, elog_size);
	release_mem_region(l1_dirbase, l1_size);
	kfree(elog_buf);
}

module_init(extlog_init);
module_exit(extlog_exit);

MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
MODULE_DESCRIPTION("Extended MCA Error Log Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
82664963	1	// SPDX-License-Identifier: GPL-2.0-only
4b3db708 CG	2	/*
	3	* Extended Error Log driver
	4	*
	5	* Copyright (C) 2013 Intel Corp.
	6	* Author: Chen, Gong <gong.chen@intel.com>
4b3db708 CG	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/acpi.h>
4b3db708 CG	11	#include <linux/cper.h>
4b3db708 CG	12	#include <linux/ratelimit.h>
42139eb3	13	#include <linux/edac.h>
d6cae935	14	#include <linux/ras.h>
4b3db708 CG	15	#include <asm/cpu.h>
	16	#include <asm/mce.h>
	17
	18	#include "apei/apei-internal.h"
2dfb7d51	19	#include <ras/ras_event.h>
4b3db708 CG	20
	21	#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */
	22
	23	#define EXTLOG_DSM_REV 0x0
4b3db708 CG	24	#define EXTLOG_FN_ADDR 0x1
	25
	26	#define FLAG_OS_OPTIN BIT(0)
4b3db708 CG	27	#define ELOG_ENTRY_VALID (1ULL<<63)
	28	#define ELOG_ENTRY_LEN 0x1000
	29
	30	#define EMCA_BUG \
	31	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
	32
	33	struct extlog_l1_head {
	34	u32 ver; /* Header Version */
	35	u32 hdr_len; /* Header Length */
	36	u64 total_len; /* entire L1 Directory length including this header */
	37	u64 elog_base; /* MCA Error Log Directory base address */
	38	u64 elog_len; /* MCA Error Log Directory length */
	39	u32 flags; /* bit 0 - OS/VMM Opt-in */
	40	u8 rev0[12];
	41	u32 entries; /* Valid L1 Directory entries per logical processor */
	42	u8 rev1[12];
	43	};
	44
7ede9f8a	45	static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295";
4b3db708 CG	46
	47	/* L1 table related physical address */
	48	static u64 elog_base;
	49	static size_t elog_size;
	50	static u64 l1_dirbase;
	51	static size_t l1_size;
	52
	53	/* L1 table related virtual address */
	54	static void __iomem *extlog_l1_addr;
	55	static void __iomem *elog_addr;
	56
	57	static void *elog_buf;
	58
	59	static u64 *l1_entry_base;
	60	static u32 l1_percpu_entry;
	61
	62	#define ELOG_IDX(cpu, bank) \
	63	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
	64
	65	#define ELOG_ENTRY_DATA(idx) \
	66	(*(l1_entry_base + (idx)))
	67
	68	#define ELOG_ENTRY_ADDR(phyaddr) \
	69	(phyaddr - elog_base + (u8 *)elog_addr)
	70
0a00fd5e	71	static struct acpi_hest_generic_status *extlog_elog_entry_check(int cpu, int bank)
4b3db708 CG	72	{
	73	int idx;
	74	u64 data;
0a00fd5e	75	struct acpi_hest_generic_status *estatus;
4b3db708 CG	76
	77	WARN_ON(cpu < 0);
	78	idx = ELOG_IDX(cpu, bank);
	79	data = ELOG_ENTRY_DATA(idx);
	80	if ((data & ELOG_ENTRY_VALID) == 0)
	81	return NULL;
	82
	83	data &= EXT_ELOG_ENTRY_MASK;
0a00fd5e	84	estatus = (struct acpi_hest_generic_status *)ELOG_ENTRY_ADDR(data);
4b3db708 CG	85
	86	/* if no valid data in elog entry, just return */
	87	if (estatus->block_status == 0)
	88	return NULL;
	89
	90	return estatus;
	91	}
	92
	93	static void __print_extlog_rcd(const char *pfx,
0a00fd5e	94	struct acpi_hest_generic_status *estatus, int cpu)
4b3db708 CG	95	{
	96	static atomic_t seqno;
	97	unsigned int curr_seqno;
	98	char pfx_seq[64];
	99
	100	if (!pfx) {
	101	if (estatus->error_severity <= CPER_SEV_CORRECTED)
	102	pfx = KERN_INFO;
	103	else
	104	pfx = KERN_ERR;
	105	}
	106	curr_seqno = atomic_inc_return(&seqno);
	107	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
	108	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
	109	cper_estatus_print(pfx_seq, estatus);
	110	}
	111
	112	static int print_extlog_rcd(const char *pfx,
0a00fd5e	113	struct acpi_hest_generic_status *estatus, int cpu)
4b3db708 CG	114	{
	115	/* Not more than 2 messages every 5 seconds */
	116	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
	117	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
	118	struct ratelimit_state *ratelimit;
	119
	120	if (estatus->error_severity == CPER_SEV_CORRECTED \|\|
	121	(estatus->error_severity == CPER_SEV_INFORMATIONAL))
	122	ratelimit = &ratelimit_corrected;
	123	else
	124	ratelimit = &ratelimit_uncorrected;
	125	if (__ratelimit(ratelimit)) {
	126	__print_extlog_rcd(pfx, estatus, cpu);
	127	return 0;
	128	}
	129
	130	return 1;
	131	}
	132
	133	static int extlog_print(struct notifier_block *nb, unsigned long val,
	134	void *data)
	135	{
	136	struct mce mce = (struct mce )data;
	137	int bank = mce->bank;
	138	int cpu = mce->extcpu;
77251319 LT	139	struct acpi_hest_generic_status estatus, tmp;
77251319 LT	140	struct acpi_hest_generic_data *gdata;
b7fe9299	141	const guid_t *fru_id = &guid_null;
2dfb7d51	142	char *fru_text = "";
b7fe9299	143	guid_t *sec_type;
2dfb7d51	144	static u32 err_seq;
4b3db708 CG	145
4b3db708 CG	146	estatus = extlog_elog_entry_check(cpu, bank);
23ba710a	147	if (estatus == NULL \|\| (mce->kflags & MCE_HANDLED_CEC))
4b3db708 CG	148	return NOTIFY_DONE;
	149
	150	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
	151	/* clear record status to enable BIOS to update it again */
	152	estatus->block_status = 0;
	153
77251319	154	tmp = (struct acpi_hest_generic_status *)elog_buf;
d6cae935 CG	155
	156	if (!ras_userspace_consumers()) {
	157	print_extlog_rcd(NULL, tmp, cpu);
	158	goto out;
	159	}
2dfb7d51 CG	160
	161	/* log event via trace */
	162	err_seq++;
77251319	163	gdata = (struct acpi_hest_generic_data *)(tmp + 1);
2dfb7d51	164	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
b7fe9299	165	fru_id = (guid_t *)gdata->fru_id;
2dfb7d51 CG	166	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
2dfb7d51 CG	167	fru_text = gdata->fru_text;
b7fe9299 AS	168	sec_type = (guid_t *)gdata->section_type;
b7fe9299 AS	169	if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
2dfb7d51 CG	170	struct cper_sec_mem_err mem = (void )(gdata + 1);
	171	if (gdata->error_data_length >= sizeof(*mem))
	172	trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
	173	(u8)gdata->error_severity);
	174	}
4b3db708	175
d6cae935	176	out:
23ba710a TL	177	mce->kflags \|= MCE_HANDLED_EXTLOG;
23ba710a TL	178	return NOTIFY_OK;
4b3db708 CG	179	}
4b3db708 CG	180
7ede9f8a	181	static bool __init extlog_get_l1addr(void)
4b3db708	182	{
b7fe9299	183	guid_t guid;
7ede9f8a JL	184	acpi_handle handle;
7ede9f8a JL	185	union acpi_object *obj;
4b3db708	186
b7fe9299 AS	187	if (guid_parse(extlog_dsm_uuid, &guid))
b7fe9299 AS	188	return false;
4b3db708 CG	189	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
4b3db708 CG	190	return false;
94116f81	191	if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
4b3db708	192	return false;
94116f81	193	obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV,
7ede9f8a JL	194	EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER);
7ede9f8a JL	195	if (!obj) {
4b3db708	196	return false;
7ede9f8a JL	197	} else {
	198	l1_dirbase = obj->integer.value;
	199	ACPI_FREE(obj);
	200	}
4b3db708	201
4b3db708 CG	202	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
	203	if (l1_dirbase & ((1 << 12) - 1)) {
	204	pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
	205	l1_dirbase);
	206	return false;
	207	}
	208
	209	return true;
	210	}
	211	static struct notifier_block extlog_mce_dec = {
	212	.notifier_call = extlog_print,
9026cc82	213	.priority = MCE_PRIO_EXTLOG,
4b3db708 CG	214	};
	215
	216	static int __init extlog_init(void)
	217	{
	218	struct extlog_l1_head *l1_head;
	219	void __iomem *extlog_l1_hdr;
	220	size_t l1_hdr_size;
	221	struct resource *r;
	222	u64 cap;
	223	int rc;
	224
7cecb47f BH	225	if (rdmsrl_safe(MSR_IA32_MCG_CAP, &cap) \|\|
	226	!(cap & MCG_ELOG_P) \|\|
	227	!extlog_get_l1addr())
7c76bb5f CG	228	return -ENODEV;
7c76bb5f CG	229
4b3db708 CG	230	rc = -EINVAL;
	231	/* get L1 header to fetch necessary information */
	232	l1_hdr_size = sizeof(struct extlog_l1_head);
	233	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
	234	if (!r) {
	235	pr_warn(FW_BUG EMCA_BUG,
	236	(unsigned long long)l1_dirbase,
	237	(unsigned long long)l1_dirbase + l1_hdr_size);
	238	goto err;
	239	}
	240
a238317c	241	extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size);
4b3db708 CG	242	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
	243	l1_size = l1_head->total_len;
	244	l1_percpu_entry = l1_head->entries;
	245	elog_base = l1_head->elog_base;
	246	elog_size = l1_head->elog_len;
a238317c	247	acpi_os_unmap_iomem(extlog_l1_hdr, l1_hdr_size);
4b3db708 CG	248	release_mem_region(l1_dirbase, l1_hdr_size);
	249
	250	/* remap L1 header again based on completed information */
	251	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
	252	if (!r) {
	253	pr_warn(FW_BUG EMCA_BUG,
	254	(unsigned long long)l1_dirbase,
	255	(unsigned long long)l1_dirbase + l1_size);
	256	goto err;
	257	}
a238317c	258	extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size);
4b3db708 CG	259	l1_entry_base = (u64 )((u8 )extlog_l1_addr + l1_hdr_size);
	260
	261	/* remap elog table */
	262	r = request_mem_region(elog_base, elog_size, "Elog Table");
	263	if (!r) {
	264	pr_warn(FW_BUG EMCA_BUG,
	265	(unsigned long long)elog_base,
	266	(unsigned long long)elog_base + elog_size);
	267	goto err_release_l1_dir;
	268	}
a238317c	269	elog_addr = acpi_os_map_iomem(elog_base, elog_size);
4b3db708 CG	270
	271	rc = -ENOMEM;
	272	/* allocate buffer to save elog record */
	273	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
	274	if (elog_buf == NULL)
	275	goto err_release_elog;
	276
	277	mce_register_decode_chain(&extlog_mce_dec);
	278	/* enable OS to be involved to take over management from BIOS */
	279	((struct extlog_l1_head *)extlog_l1_addr)->flags \|= FLAG_OS_OPTIN;
	280
	281	return 0;
	282
	283	err_release_elog:
	284	if (elog_addr)
a238317c	285	acpi_os_unmap_iomem(elog_addr, elog_size);
4b3db708 CG	286	release_mem_region(elog_base, elog_size);
	287	err_release_l1_dir:
	288	if (extlog_l1_addr)
a238317c	289	acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
4b3db708 CG	290	release_mem_region(l1_dirbase, l1_size);
	291	err:
	292	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
	293	return rc;
	294	}
	295
	296	static void __exit extlog_exit(void)
	297	{
	298	mce_unregister_decode_chain(&extlog_mce_dec);
	299	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
	300	if (extlog_l1_addr)
a238317c	301	acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
4b3db708	302	if (elog_addr)
a238317c	303	acpi_os_unmap_iomem(elog_addr, elog_size);
4b3db708 CG	304	release_mem_region(elog_base, elog_size);
	305	release_mem_region(l1_dirbase, l1_size);
	306	kfree(elog_buf);
	307	}
	308
	309	module_init(extlog_init);
	310	module_exit(extlog_exit);
	311
	312	MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
	313	MODULE_DESCRIPTION("Extended MCA Error Log Driver");
	314	MODULE_LICENSE("GPL");