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

/*
 * Extended Error Log driver
 *
 * Copyright (C) 2013 Intel Corp.
 * Author: Chen, Gong <gong.chen@intel.com>
 *
 * This file is licensed under GPLv2.
 */

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

#include "apei/apei-internal.h"

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

#define EXTLOG_DSM_REV		0x0
#define	EXTLOG_FN_QUERY		0x0
#define	EXTLOG_FN_ADDR		0x1

#define FLAG_OS_OPTIN		BIT(0)
#define EXTLOG_QUERY_L1_EXIST	BIT(1)
#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 int old_edac_report_status;

static u8 extlog_dsm_uuid[] = "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_generic_status *extlog_elog_entry_check(int cpu, int bank)
{
	int idx;
	u64 data;
	struct acpi_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_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_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_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_generic_status *estatus;
	int rc;

	estatus = extlog_elog_entry_check(cpu, bank);
	if (estatus == NULL)
		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;

	rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);

	return NOTIFY_STOP;
}

static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
{
	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
	struct acpi_object_list input;
	union acpi_object params[4], *obj;
	u8 uuid[16];
	int i;

	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = 16;
	params[0].buffer.pointer = uuid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = rev;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_PACKAGE;
	params[3].package.count = 0;
	params[3].package.elements = NULL;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
		return -1;

	*ret = 0;
	obj = (union acpi_object *)buf.pointer;
	if (obj->type == ACPI_TYPE_INTEGER) {
		*ret = obj->integer.value;
	} else if (obj->type == ACPI_TYPE_BUFFER) {
		if (obj->buffer.length <= 8) {
			for (i = 0; i < obj->buffer.length; i++)
				*ret |= (obj->buffer.pointer[i] << (i * 8));
		}
	}
	kfree(buf.pointer);

	return 0;
}

static bool extlog_get_l1addr(void)
{
	acpi_handle handle;
	u64 ret;

	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
		return false;

	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
	    !(ret & EXTLOG_QUERY_L1_EXIST))
		return false;

	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
		return false;

	l1_dirbase = ret;
	/* 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,
};

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 (get_edac_report_status() == EDAC_REPORTING_FORCE) {
		pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
		return -EPERM;
	}

	rc = -ENODEV;
	rdmsrl(MSR_IA32_MCG_CAP, cap);
	if (!(cap & MCG_ELOG_P))
		return rc;

	if (!extlog_get_l1addr())
		return rc;

	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_memory(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_memory(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_memory(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_memory(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;

	/*
	 * eMCA event report method has higher priority than EDAC method,
	 * unless EDAC event report method is mandatory.
	 */
	old_edac_report_status = get_edac_report_status();
	set_edac_report_status(EDAC_REPORTING_DISABLED);
	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_memory(elog_addr, elog_size);
	release_mem_region(elog_base, elog_size);
err_release_l1_dir:
	if (extlog_l1_addr)
		acpi_os_unmap_memory(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)
{
	set_edac_report_status(old_edac_report_status);
	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_memory(extlog_l1_addr, l1_size);
	if (elog_addr)
		acpi_os_unmap_memory(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
4b3db708 CG	1	/*
	2	* Extended Error Log driver
	3	*
	4	* Copyright (C) 2013 Intel Corp.
	5	* Author: Chen, Gong <gong.chen@intel.com>
	6	*
	7	* This file is licensed under GPLv2.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/acpi.h>
	12	#include <acpi/acpi_bus.h>
	13	#include <linux/cper.h>
	14	#include <linux/ratelimit.h>
42139eb3	15	#include <linux/edac.h>
4b3db708 CG	16	#include <asm/cpu.h>
	17	#include <asm/mce.h>
	18
	19	#include "apei/apei-internal.h"
	20
	21	#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */
	22
	23	#define EXTLOG_DSM_REV 0x0
	24	#define EXTLOG_FN_QUERY 0x0
	25	#define EXTLOG_FN_ADDR 0x1
	26
	27	#define FLAG_OS_OPTIN BIT(0)
	28	#define EXTLOG_QUERY_L1_EXIST BIT(1)
	29	#define ELOG_ENTRY_VALID (1ULL<<63)
	30	#define ELOG_ENTRY_LEN 0x1000
	31
	32	#define EMCA_BUG \
	33	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
	34
	35	struct extlog_l1_head {
	36	u32 ver; /* Header Version */
	37	u32 hdr_len; /* Header Length */
	38	u64 total_len; /* entire L1 Directory length including this header */
	39	u64 elog_base; /* MCA Error Log Directory base address */
	40	u64 elog_len; /* MCA Error Log Directory length */
	41	u32 flags; /* bit 0 - OS/VMM Opt-in */
	42	u8 rev0[12];
	43	u32 entries; /* Valid L1 Directory entries per logical processor */
	44	u8 rev1[12];
	45	};
	46
42139eb3 CG	47	static int old_edac_report_status;
42139eb3 CG	48
4b3db708 CG	49	static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
	50
	51	/* L1 table related physical address */
	52	static u64 elog_base;
	53	static size_t elog_size;
	54	static u64 l1_dirbase;
	55	static size_t l1_size;
	56
	57	/* L1 table related virtual address */
	58	static void __iomem *extlog_l1_addr;
	59	static void __iomem *elog_addr;
	60
	61	static void *elog_buf;
	62
	63	static u64 *l1_entry_base;
	64	static u32 l1_percpu_entry;
	65
	66	#define ELOG_IDX(cpu, bank) \
	67	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
	68
	69	#define ELOG_ENTRY_DATA(idx) \
	70	(*(l1_entry_base + (idx)))
	71
	72	#define ELOG_ENTRY_ADDR(phyaddr) \
	73	(phyaddr - elog_base + (u8 *)elog_addr)
	74
	75	static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
	76	{
	77	int idx;
	78	u64 data;
	79	struct acpi_generic_status *estatus;
	80
	81	WARN_ON(cpu < 0);
	82	idx = ELOG_IDX(cpu, bank);
	83	data = ELOG_ENTRY_DATA(idx);
	84	if ((data & ELOG_ENTRY_VALID) == 0)
	85	return NULL;
	86
	87	data &= EXT_ELOG_ENTRY_MASK;
	88	estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);
	89
	90	/* if no valid data in elog entry, just return */
	91	if (estatus->block_status == 0)
	92	return NULL;
	93
	94	return estatus;
	95	}
	96
	97	static void __print_extlog_rcd(const char *pfx,
	98	struct acpi_generic_status *estatus, int cpu)
	99	{
	100	static atomic_t seqno;
	101	unsigned int curr_seqno;
	102	char pfx_seq[64];
	103
	104	if (!pfx) {
	105	if (estatus->error_severity <= CPER_SEV_CORRECTED)
	106	pfx = KERN_INFO;
	107	else
	108	pfx = KERN_ERR;
	109	}
	110	curr_seqno = atomic_inc_return(&seqno);
	111	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
	112	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
113	cper_estatus_print(pfx_seq, estatus);
114	}
115
116	static int print_extlog_rcd(const char *pfx,
117	struct acpi_generic_status *estatus, int cpu)
118	{
119	/* Not more than 2 messages every 5 seconds */
120	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
121	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
122	struct ratelimit_state *ratelimit;
123
124	if (estatus->error_severity == CPER_SEV_CORRECTED \|\|
125	(estatus->error_severity == CPER_SEV_INFORMATIONAL))
126	ratelimit = &ratelimit_corrected;
127	else
128	ratelimit = &ratelimit_uncorrected;
129	if (__ratelimit(ratelimit)) {
130	__print_extlog_rcd(pfx, estatus, cpu);
131	return 0;
132	}
133
134	return 1;
135	}
136
137	static int extlog_print(struct notifier_block *nb, unsigned long val,
138	void *data)
139	{
140	struct mce mce = (struct mce )data;
141	int bank = mce->bank;
142	int cpu = mce->extcpu;
143	struct acpi_generic_status *estatus;
144	int rc;
145
146	estatus = extlog_elog_entry_check(cpu, bank);
147	if (estatus == NULL)
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
154	rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);
155
42139eb3	156	return NOTIFY_STOP;
4b3db708 CG	157	}
	158
	159	static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
	160	{
	161	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
	162	struct acpi_object_list input;
	163	union acpi_object params[4], *obj;
	164	u8 uuid[16];
	165	int i;
	166
	167	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
	168	input.count = 4;
	169	input.pointer = params;
	170	params[0].type = ACPI_TYPE_BUFFER;
	171	params[0].buffer.length = 16;
	172	params[0].buffer.pointer = uuid;
	173	params[1].type = ACPI_TYPE_INTEGER;
	174	params[1].integer.value = rev;
	175	params[2].type = ACPI_TYPE_INTEGER;
	176	params[2].integer.value = func;
	177	params[3].type = ACPI_TYPE_PACKAGE;
	178	params[3].package.count = 0;
	179	params[3].package.elements = NULL;
	180
	181	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
	182	return -1;
	183
	184	*ret = 0;
	185	obj = (union acpi_object *)buf.pointer;
	186	if (obj->type == ACPI_TYPE_INTEGER) {
	187	*ret = obj->integer.value;
	188	} else if (obj->type == ACPI_TYPE_BUFFER) {
	189	if (obj->buffer.length <= 8) {
	190	for (i = 0; i < obj->buffer.length; i++)
	191	ret \|= (obj->buffer.pointer[i] << (i 8));
	192	}
	193	}
	194	kfree(buf.pointer);
	195
	196	return 0;
	197	}
	198
	199	static bool extlog_get_l1addr(void)
	200	{
	201	acpi_handle handle;
	202	u64 ret;
	203
	204	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
	205	return false;
	206
	207	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) \|\|
	208	!(ret & EXTLOG_QUERY_L1_EXIST))
	209	return false;
	210
	211	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
	212	return false;
	213
	214	l1_dirbase = ret;
	215	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
	216	if (l1_dirbase & ((1 << 12) - 1)) {
	217	pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
	218	l1_dirbase);
	219	return false;
	220	}
221
222	return true;
223	}
224	static struct notifier_block extlog_mce_dec = {
225	.notifier_call = extlog_print,
226	};
227
228	static int __init extlog_init(void)
229	{
230	struct extlog_l1_head *l1_head;
231	void __iomem *extlog_l1_hdr;
232	size_t l1_hdr_size;
233	struct resource *r;
234	u64 cap;
235	int rc;
236
42139eb3 CG	237	if (get_edac_report_status() == EDAC_REPORTING_FORCE) {
	238	pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
	239	return -EPERM;
	240	}
4b3db708	241
42139eb3	242	rc = -ENODEV;
4b3db708 CG	243	rdmsrl(MSR_IA32_MCG_CAP, cap);
	244	if (!(cap & MCG_ELOG_P))
	245	return rc;
	246
	247	if (!extlog_get_l1addr())
	248	return rc;
	249
	250	rc = -EINVAL;
	251	/* get L1 header to fetch necessary information */
	252	l1_hdr_size = sizeof(struct extlog_l1_head);
	253	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
	254	if (!r) {
	255	pr_warn(FW_BUG EMCA_BUG,
	256	(unsigned long long)l1_dirbase,
	257	(unsigned long long)l1_dirbase + l1_hdr_size);
	258	goto err;
	259	}
	260
	261	extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
	262	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
	263	l1_size = l1_head->total_len;
	264	l1_percpu_entry = l1_head->entries;
	265	elog_base = l1_head->elog_base;
	266	elog_size = l1_head->elog_len;
	267	acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
	268	release_mem_region(l1_dirbase, l1_hdr_size);
	269
	270	/* remap L1 header again based on completed information */
	271	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
	272	if (!r) {
	273	pr_warn(FW_BUG EMCA_BUG,
	274	(unsigned long long)l1_dirbase,
	275	(unsigned long long)l1_dirbase + l1_size);
	276	goto err;
	277	}
	278	extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
	279	l1_entry_base = (u64 )((u8 )extlog_l1_addr + l1_hdr_size);
	280
	281	/* remap elog table */
	282	r = request_mem_region(elog_base, elog_size, "Elog Table");
	283	if (!r) {
	284	pr_warn(FW_BUG EMCA_BUG,
	285	(unsigned long long)elog_base,
	286	(unsigned long long)elog_base + elog_size);
	287	goto err_release_l1_dir;
	288	}
	289	elog_addr = acpi_os_map_memory(elog_base, elog_size);
	290
	291	rc = -ENOMEM;
	292	/* allocate buffer to save elog record */
	293	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
	294	if (elog_buf == NULL)
	295	goto err_release_elog;
	296
42139eb3 CG	297	/*
	298	* eMCA event report method has higher priority than EDAC method,
	299	* unless EDAC event report method is mandatory.
	300	*/
	301	old_edac_report_status = get_edac_report_status();
	302	set_edac_report_status(EDAC_REPORTING_DISABLED);
4b3db708 CG	303	mce_register_decode_chain(&extlog_mce_dec);
	304	/* enable OS to be involved to take over management from BIOS */
	305	((struct extlog_l1_head *)extlog_l1_addr)->flags \|= FLAG_OS_OPTIN;
	306
	307	return 0;
	308
	309	err_release_elog:
	310	if (elog_addr)
	311	acpi_os_unmap_memory(elog_addr, elog_size);
	312	release_mem_region(elog_base, elog_size);
	313	err_release_l1_dir:
	314	if (extlog_l1_addr)
	315	acpi_os_unmap_memory(extlog_l1_addr, l1_size);
	316	release_mem_region(l1_dirbase, l1_size);
	317	err:
	318	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
	319	return rc;
	320	}
	321
	322	static void __exit extlog_exit(void)
	323	{
42139eb3	324	set_edac_report_status(old_edac_report_status);
4b3db708 CG	325	mce_unregister_decode_chain(&extlog_mce_dec);
	326	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
	327	if (extlog_l1_addr)
	328	acpi_os_unmap_memory(extlog_l1_addr, l1_size);
	329	if (elog_addr)
	330	acpi_os_unmap_memory(elog_addr, elog_size);
	331	release_mem_region(elog_base, elog_size);
	332	release_mem_region(l1_dirbase, l1_size);
	333	kfree(elog_buf);
	334	}
	335
	336	module_init(extlog_init);
	337	module_exit(extlog_exit);
	338
	339	MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
	340	MODULE_DESCRIPTION("Extended MCA Error Log Driver");
	341	MODULE_LICENSE("GPL");