[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 int old_edac_report_status;

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)
		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:
	return NOTIFY_STOP;
}

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;

	rdmsrl(MSR_IA32_MCG_CAP, cap);

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

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

	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;

	/*
	 * eMCA event report method has higher priority than EDAC method,
	 * unless EDAC event report method is mandatory.
	 */
	old_edac_report_status = edac_get_report_status();
	edac_set_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_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)
{
	edac_set_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_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
42139eb3 CG	45	static int old_edac_report_status;
42139eb3 CG	46
7ede9f8a	47	static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295";
4b3db708 CG	48
	49	/* L1 table related physical address */
	50	static u64 elog_base;
	51	static size_t elog_size;
	52	static u64 l1_dirbase;
	53	static size_t l1_size;
	54
	55	/* L1 table related virtual address */
	56	static void __iomem *extlog_l1_addr;
	57	static void __iomem *elog_addr;
	58
	59	static void *elog_buf;
	60
	61	static u64 *l1_entry_base;
	62	static u32 l1_percpu_entry;
	63
	64	#define ELOG_IDX(cpu, bank) \
	65	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
	66
	67	#define ELOG_ENTRY_DATA(idx) \
	68	(*(l1_entry_base + (idx)))
	69
	70	#define ELOG_ENTRY_ADDR(phyaddr) \
	71	(phyaddr - elog_base + (u8 *)elog_addr)
	72
0a00fd5e	73	static struct acpi_hest_generic_status *extlog_elog_entry_check(int cpu, int bank)
4b3db708 CG	74	{
	75	int idx;
	76	u64 data;
0a00fd5e	77	struct acpi_hest_generic_status *estatus;
4b3db708 CG	78
	79	WARN_ON(cpu < 0);
	80	idx = ELOG_IDX(cpu, bank);
	81	data = ELOG_ENTRY_DATA(idx);
	82	if ((data & ELOG_ENTRY_VALID) == 0)
	83	return NULL;
	84
	85	data &= EXT_ELOG_ENTRY_MASK;
0a00fd5e	86	estatus = (struct acpi_hest_generic_status *)ELOG_ENTRY_ADDR(data);
4b3db708 CG	87
	88	/* if no valid data in elog entry, just return */
	89	if (estatus->block_status == 0)
	90	return NULL;
	91
	92	return estatus;
	93	}
	94
	95	static void __print_extlog_rcd(const char *pfx,
0a00fd5e	96	struct acpi_hest_generic_status *estatus, int cpu)
4b3db708 CG	97	{
	98	static atomic_t seqno;
	99	unsigned int curr_seqno;
	100	char pfx_seq[64];
	101
	102	if (!pfx) {
	103	if (estatus->error_severity <= CPER_SEV_CORRECTED)
	104	pfx = KERN_INFO;
	105	else
	106	pfx = KERN_ERR;
	107	}
	108	curr_seqno = atomic_inc_return(&seqno);
	109	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
	110	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
	111	cper_estatus_print(pfx_seq, estatus);
	112	}
	113
	114	static int print_extlog_rcd(const char *pfx,
0a00fd5e	115	struct acpi_hest_generic_status *estatus, int cpu)
4b3db708 CG	116	{
	117	/* Not more than 2 messages every 5 seconds */
	118	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
	119	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
	120	struct ratelimit_state *ratelimit;
	121
	122	if (estatus->error_severity == CPER_SEV_CORRECTED \|\|
	123	(estatus->error_severity == CPER_SEV_INFORMATIONAL))
	124	ratelimit = &ratelimit_corrected;
	125	else
	126	ratelimit = &ratelimit_uncorrected;
	127	if (__ratelimit(ratelimit)) {
	128	__print_extlog_rcd(pfx, estatus, cpu);
	129	return 0;
	130	}
	131
	132	return 1;
	133	}
	134
	135	static int extlog_print(struct notifier_block *nb, unsigned long val,
	136	void *data)
	137	{
	138	struct mce mce = (struct mce )data;
	139	int bank = mce->bank;
	140	int cpu = mce->extcpu;
77251319 LT	141	struct acpi_hest_generic_status estatus, tmp;
77251319 LT	142	struct acpi_hest_generic_data *gdata;
b7fe9299	143	const guid_t *fru_id = &guid_null;
2dfb7d51	144	char *fru_text = "";
b7fe9299	145	guid_t *sec_type;
2dfb7d51	146	static u32 err_seq;
4b3db708 CG	147
	148	estatus = extlog_elog_entry_check(cpu, bank);
	149	if (estatus == NULL)
	150	return NOTIFY_DONE;
	151
	152	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
	153	/* clear record status to enable BIOS to update it again */
	154	estatus->block_status = 0;
	155
77251319	156	tmp = (struct acpi_hest_generic_status *)elog_buf;
d6cae935 CG	157
	158	if (!ras_userspace_consumers()) {
	159	print_extlog_rcd(NULL, tmp, cpu);
	160	goto out;
	161	}
2dfb7d51 CG	162
	163	/* log event via trace */
	164	err_seq++;
77251319	165	gdata = (struct acpi_hest_generic_data *)(tmp + 1);
2dfb7d51	166	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
b7fe9299	167	fru_id = (guid_t *)gdata->fru_id;
2dfb7d51 CG	168	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
2dfb7d51 CG	169	fru_text = gdata->fru_text;
b7fe9299 AS	170	sec_type = (guid_t *)gdata->section_type;
b7fe9299 AS	171	if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
2dfb7d51 CG	172	struct cper_sec_mem_err mem = (void )(gdata + 1);
	173	if (gdata->error_data_length >= sizeof(*mem))
	174	trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
	175	(u8)gdata->error_severity);
	176	}
4b3db708	177
d6cae935	178	out:
42139eb3	179	return NOTIFY_STOP;
4b3db708 CG	180	}
4b3db708 CG	181
7ede9f8a	182	static bool __init extlog_get_l1addr(void)
4b3db708	183	{
b7fe9299	184	guid_t guid;
7ede9f8a JL	185	acpi_handle handle;
7ede9f8a JL	186	union acpi_object *obj;
4b3db708	187
b7fe9299 AS	188	if (guid_parse(extlog_dsm_uuid, &guid))
b7fe9299 AS	189	return false;
4b3db708 CG	190	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
4b3db708 CG	191	return false;
94116f81	192	if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
4b3db708	193	return false;
94116f81	194	obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV,
7ede9f8a JL	195	EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER);
7ede9f8a JL	196	if (!obj) {
4b3db708	197	return false;
7ede9f8a JL	198	} else {
	199	l1_dirbase = obj->integer.value;
	200	ACPI_FREE(obj);
	201	}
4b3db708	202
4b3db708 CG	203	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
	204	if (l1_dirbase & ((1 << 12) - 1)) {
	205	pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
	206	l1_dirbase);
	207	return false;
	208	}
	209
	210	return true;
	211	}
	212	static struct notifier_block extlog_mce_dec = {
	213	.notifier_call = extlog_print,
9026cc82	214	.priority = MCE_PRIO_EXTLOG,
4b3db708 CG	215	};
	216
	217	static int __init extlog_init(void)
	218	{
	219	struct extlog_l1_head *l1_head;
	220	void __iomem *extlog_l1_hdr;
	221	size_t l1_hdr_size;
	222	struct resource *r;
	223	u64 cap;
	224	int rc;
	225
7c76bb5f CG	226	rdmsrl(MSR_IA32_MCG_CAP, cap);
	227
	228	if (!(cap & MCG_ELOG_P) \|\| !extlog_get_l1addr())
	229	return -ENODEV;
	230
bffc7dec	231	if (edac_get_report_status() == EDAC_REPORTING_FORCE) {
42139eb3 CG	232	pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
	233	return -EPERM;
	234	}
4b3db708	235
4b3db708 CG	236	rc = -EINVAL;
	237	/* get L1 header to fetch necessary information */
	238	l1_hdr_size = sizeof(struct extlog_l1_head);
	239	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
	240	if (!r) {
	241	pr_warn(FW_BUG EMCA_BUG,
	242	(unsigned long long)l1_dirbase,
	243	(unsigned long long)l1_dirbase + l1_hdr_size);
	244	goto err;
	245	}
	246
a238317c	247	extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size);
4b3db708 CG	248	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
	249	l1_size = l1_head->total_len;
	250	l1_percpu_entry = l1_head->entries;
	251	elog_base = l1_head->elog_base;
	252	elog_size = l1_head->elog_len;
a238317c	253	acpi_os_unmap_iomem(extlog_l1_hdr, l1_hdr_size);
4b3db708 CG	254	release_mem_region(l1_dirbase, l1_hdr_size);
	255
	256	/* remap L1 header again based on completed information */
	257	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
	258	if (!r) {
	259	pr_warn(FW_BUG EMCA_BUG,
	260	(unsigned long long)l1_dirbase,
	261	(unsigned long long)l1_dirbase + l1_size);
	262	goto err;
	263	}
a238317c	264	extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size);
4b3db708 CG	265	l1_entry_base = (u64 )((u8 )extlog_l1_addr + l1_hdr_size);
	266
	267	/* remap elog table */
	268	r = request_mem_region(elog_base, elog_size, "Elog Table");
	269	if (!r) {
	270	pr_warn(FW_BUG EMCA_BUG,
	271	(unsigned long long)elog_base,
	272	(unsigned long long)elog_base + elog_size);
	273	goto err_release_l1_dir;
	274	}
a238317c	275	elog_addr = acpi_os_map_iomem(elog_base, elog_size);
4b3db708 CG	276
	277	rc = -ENOMEM;
	278	/* allocate buffer to save elog record */
	279	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
	280	if (elog_buf == NULL)
	281	goto err_release_elog;
	282
42139eb3 CG	283	/*
	284	* eMCA event report method has higher priority than EDAC method,
	285	* unless EDAC event report method is mandatory.
	286	*/
bffc7dec BP	287	old_edac_report_status = edac_get_report_status();
bffc7dec BP	288	edac_set_report_status(EDAC_REPORTING_DISABLED);
4b3db708 CG	289	mce_register_decode_chain(&extlog_mce_dec);
	290	/* enable OS to be involved to take over management from BIOS */
	291	((struct extlog_l1_head *)extlog_l1_addr)->flags \|= FLAG_OS_OPTIN;
	292
	293	return 0;
	294
	295	err_release_elog:
	296	if (elog_addr)
a238317c	297	acpi_os_unmap_iomem(elog_addr, elog_size);
4b3db708 CG	298	release_mem_region(elog_base, elog_size);
	299	err_release_l1_dir:
	300	if (extlog_l1_addr)
a238317c	301	acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
4b3db708 CG	302	release_mem_region(l1_dirbase, l1_size);
	303	err:
	304	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
	305	return rc;
	306	}
	307
	308	static void __exit extlog_exit(void)
	309	{
bffc7dec	310	edac_set_report_status(old_edac_report_status);
4b3db708 CG	311	mce_unregister_decode_chain(&extlog_mce_dec);
	312	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
	313	if (extlog_l1_addr)
a238317c	314	acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
4b3db708	315	if (elog_addr)
a238317c	316	acpi_os_unmap_iomem(elog_addr, elog_size);
4b3db708 CG	317	release_mem_region(elog_base, elog_size);
	318	release_mem_region(l1_dirbase, l1_size);
	319	kfree(elog_buf);
	320	}
	321
	322	module_init(extlog_init);
	323	module_exit(extlog_exit);
	324
	325	MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
	326	MODULE_DESCRIPTION("Extended MCA Error Log Driver");
	327	MODULE_LICENSE("GPL");