[mirror_ubuntu-artful-kernel.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 <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
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>
4b3db708 CG	12	#include <linux/cper.h>
4b3db708 CG	13	#include <linux/ratelimit.h>
42139eb3	14	#include <linux/edac.h>
d6cae935	15	#include <linux/ras.h>
4b3db708 CG	16	#include <asm/cpu.h>
	17	#include <asm/mce.h>
	18
	19	#include "apei/apei-internal.h"
2dfb7d51	20	#include <ras/ras_event.h>
4b3db708 CG	21
	22	#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */
	23
	24	#define EXTLOG_DSM_REV 0x0
4b3db708 CG	25	#define EXTLOG_FN_ADDR 0x1
	26
	27	#define FLAG_OS_OPTIN BIT(0)
4b3db708 CG	28	#define ELOG_ENTRY_VALID (1ULL<<63)
	29	#define ELOG_ENTRY_LEN 0x1000
	30
	31	#define EMCA_BUG \
	32	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
	33
	34	struct extlog_l1_head {
	35	u32 ver; /* Header Version */
	36	u32 hdr_len; /* Header Length */
	37	u64 total_len; /* entire L1 Directory length including this header */
	38	u64 elog_base; /* MCA Error Log Directory base address */
	39	u64 elog_len; /* MCA Error Log Directory length */
	40	u32 flags; /* bit 0 - OS/VMM Opt-in */
	41	u8 rev0[12];
	42	u32 entries; /* Valid L1 Directory entries per logical processor */
	43	u8 rev1[12];
	44	};
	45
42139eb3 CG	46	static int old_edac_report_status;
42139eb3 CG	47
7ede9f8a	48	static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295";
4b3db708 CG	49
	50	/* L1 table related physical address */
	51	static u64 elog_base;
	52	static size_t elog_size;
	53	static u64 l1_dirbase;
	54	static size_t l1_size;
	55
	56	/* L1 table related virtual address */
	57	static void __iomem *extlog_l1_addr;
	58	static void __iomem *elog_addr;
	59
	60	static void *elog_buf;
	61
	62	static u64 *l1_entry_base;
	63	static u32 l1_percpu_entry;
	64
	65	#define ELOG_IDX(cpu, bank) \
	66	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
	67
	68	#define ELOG_ENTRY_DATA(idx) \
	69	(*(l1_entry_base + (idx)))
	70
	71	#define ELOG_ENTRY_ADDR(phyaddr) \
	72	(phyaddr - elog_base + (u8 *)elog_addr)
	73
0a00fd5e	74	static struct acpi_hest_generic_status *extlog_elog_entry_check(int cpu, int bank)
4b3db708 CG	75	{
	76	int idx;
	77	u64 data;
0a00fd5e	78	struct acpi_hest_generic_status *estatus;
4b3db708 CG	79
	80	WARN_ON(cpu < 0);
	81	idx = ELOG_IDX(cpu, bank);
	82	data = ELOG_ENTRY_DATA(idx);
	83	if ((data & ELOG_ENTRY_VALID) == 0)
	84	return NULL;
	85
	86	data &= EXT_ELOG_ENTRY_MASK;
0a00fd5e	87	estatus = (struct acpi_hest_generic_status *)ELOG_ENTRY_ADDR(data);
4b3db708 CG	88
	89	/* if no valid data in elog entry, just return */
	90	if (estatus->block_status == 0)
	91	return NULL;
	92
	93	return estatus;
	94	}
	95
	96	static void __print_extlog_rcd(const char *pfx,
0a00fd5e	97	struct acpi_hest_generic_status *estatus, int cpu)
4b3db708 CG	98	{
	99	static atomic_t seqno;
	100	unsigned int curr_seqno;
	101	char pfx_seq[64];
	102
	103	if (!pfx) {
	104	if (estatus->error_severity <= CPER_SEV_CORRECTED)
	105	pfx = KERN_INFO;
	106	else
	107	pfx = KERN_ERR;
	108	}
	109	curr_seqno = atomic_inc_return(&seqno);
	110	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
	111	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
	112	cper_estatus_print(pfx_seq, estatus);
	113	}
	114
	115	static int print_extlog_rcd(const char *pfx,
0a00fd5e	116	struct acpi_hest_generic_status *estatus, int cpu)
4b3db708 CG	117	{
	118	/* Not more than 2 messages every 5 seconds */
	119	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
	120	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
	121	struct ratelimit_state *ratelimit;
	122
	123	if (estatus->error_severity == CPER_SEV_CORRECTED \|\|
	124	(estatus->error_severity == CPER_SEV_INFORMATIONAL))
	125	ratelimit = &ratelimit_corrected;
	126	else
	127	ratelimit = &ratelimit_uncorrected;
	128	if (__ratelimit(ratelimit)) {
	129	__print_extlog_rcd(pfx, estatus, cpu);
	130	return 0;
	131	}
	132
	133	return 1;
	134	}
	135
	136	static int extlog_print(struct notifier_block *nb, unsigned long val,
	137	void *data)
	138	{
	139	struct mce mce = (struct mce )data;
	140	int bank = mce->bank;
	141	int cpu = mce->extcpu;
77251319 LT	142	struct acpi_hest_generic_status estatus, tmp;
77251319 LT	143	struct acpi_hest_generic_data *gdata;
b7fe9299	144	const guid_t *fru_id = &guid_null;
2dfb7d51	145	char *fru_text = "";
b7fe9299	146	guid_t *sec_type;
2dfb7d51	147	static u32 err_seq;
4b3db708 CG	148
	149	estatus = extlog_elog_entry_check(cpu, bank);
	150	if (estatus == NULL)
	151	return NOTIFY_DONE;
	152
	153	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
	154	/* clear record status to enable BIOS to update it again */
	155	estatus->block_status = 0;
	156
77251319	157	tmp = (struct acpi_hest_generic_status *)elog_buf;
d6cae935 CG	158
	159	if (!ras_userspace_consumers()) {
	160	print_extlog_rcd(NULL, tmp, cpu);
	161	goto out;
	162	}
2dfb7d51 CG	163
	164	/* log event via trace */
	165	err_seq++;
77251319	166	gdata = (struct acpi_hest_generic_data *)(tmp + 1);
2dfb7d51	167	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
b7fe9299	168	fru_id = (guid_t *)gdata->fru_id;
2dfb7d51 CG	169	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
2dfb7d51 CG	170	fru_text = gdata->fru_text;
b7fe9299 AS	171	sec_type = (guid_t *)gdata->section_type;
b7fe9299 AS	172	if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
2dfb7d51 CG	173	struct cper_sec_mem_err mem = (void )(gdata + 1);
	174	if (gdata->error_data_length >= sizeof(*mem))
	175	trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
	176	(u8)gdata->error_severity);
	177	}
4b3db708	178
d6cae935	179	out:
42139eb3	180	return NOTIFY_STOP;
4b3db708 CG	181	}
4b3db708 CG	182
7ede9f8a	183	static bool __init extlog_get_l1addr(void)
4b3db708	184	{
b7fe9299	185	guid_t guid;
7ede9f8a JL	186	acpi_handle handle;
7ede9f8a JL	187	union acpi_object *obj;
4b3db708	188
b7fe9299 AS	189	if (guid_parse(extlog_dsm_uuid, &guid))
b7fe9299 AS	190	return false;
4b3db708 CG	191	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
4b3db708 CG	192	return false;
94116f81	193	if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
4b3db708	194	return false;
94116f81	195	obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV,
7ede9f8a JL	196	EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER);
7ede9f8a JL	197	if (!obj) {
4b3db708	198	return false;
7ede9f8a JL	199	} else {
	200	l1_dirbase = obj->integer.value;
	201	ACPI_FREE(obj);
	202	}
4b3db708	203
4b3db708 CG	204	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
	205	if (l1_dirbase & ((1 << 12) - 1)) {
	206	pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
	207	l1_dirbase);
	208	return false;
	209	}
	210
	211	return true;
	212	}
	213	static struct notifier_block extlog_mce_dec = {
	214	.notifier_call = extlog_print,
9026cc82	215	.priority = MCE_PRIO_EXTLOG,
4b3db708 CG	216	};
	217
	218	static int __init extlog_init(void)
	219	{
	220	struct extlog_l1_head *l1_head;
	221	void __iomem *extlog_l1_hdr;
	222	size_t l1_hdr_size;
	223	struct resource *r;
	224	u64 cap;
	225	int rc;
	226
7c76bb5f CG	227	rdmsrl(MSR_IA32_MCG_CAP, cap);
	228
	229	if (!(cap & MCG_ELOG_P) \|\| !extlog_get_l1addr())
	230	return -ENODEV;
	231
bffc7dec	232	if (edac_get_report_status() == EDAC_REPORTING_FORCE) {
42139eb3 CG	233	pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
	234	return -EPERM;
	235	}
4b3db708	236
4b3db708 CG	237	rc = -EINVAL;
	238	/* get L1 header to fetch necessary information */
	239	l1_hdr_size = sizeof(struct extlog_l1_head);
	240	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
	241	if (!r) {
	242	pr_warn(FW_BUG EMCA_BUG,
	243	(unsigned long long)l1_dirbase,
	244	(unsigned long long)l1_dirbase + l1_hdr_size);
	245	goto err;
	246	}
	247
a238317c	248	extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size);
4b3db708 CG	249	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
	250	l1_size = l1_head->total_len;
	251	l1_percpu_entry = l1_head->entries;
	252	elog_base = l1_head->elog_base;
	253	elog_size = l1_head->elog_len;
a238317c	254	acpi_os_unmap_iomem(extlog_l1_hdr, l1_hdr_size);
4b3db708 CG	255	release_mem_region(l1_dirbase, l1_hdr_size);
	256
	257	/* remap L1 header again based on completed information */
	258	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
	259	if (!r) {
	260	pr_warn(FW_BUG EMCA_BUG,
	261	(unsigned long long)l1_dirbase,
	262	(unsigned long long)l1_dirbase + l1_size);
	263	goto err;
	264	}
a238317c	265	extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size);
4b3db708 CG	266	l1_entry_base = (u64 )((u8 )extlog_l1_addr + l1_hdr_size);
	267
	268	/* remap elog table */
	269	r = request_mem_region(elog_base, elog_size, "Elog Table");
	270	if (!r) {
	271	pr_warn(FW_BUG EMCA_BUG,
	272	(unsigned long long)elog_base,
	273	(unsigned long long)elog_base + elog_size);
	274	goto err_release_l1_dir;
	275	}
a238317c	276	elog_addr = acpi_os_map_iomem(elog_base, elog_size);
4b3db708 CG	277
	278	rc = -ENOMEM;
	279	/* allocate buffer to save elog record */
	280	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
	281	if (elog_buf == NULL)
	282	goto err_release_elog;
	283
42139eb3 CG	284	/*
	285	* eMCA event report method has higher priority than EDAC method,
	286	* unless EDAC event report method is mandatory.
	287	*/
bffc7dec BP	288	old_edac_report_status = edac_get_report_status();
bffc7dec BP	289	edac_set_report_status(EDAC_REPORTING_DISABLED);
4b3db708 CG	290	mce_register_decode_chain(&extlog_mce_dec);
	291	/* enable OS to be involved to take over management from BIOS */
	292	((struct extlog_l1_head *)extlog_l1_addr)->flags \|= FLAG_OS_OPTIN;
	293
	294	return 0;
	295
	296	err_release_elog:
	297	if (elog_addr)
a238317c	298	acpi_os_unmap_iomem(elog_addr, elog_size);
4b3db708 CG	299	release_mem_region(elog_base, elog_size);
	300	err_release_l1_dir:
	301	if (extlog_l1_addr)
a238317c	302	acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
4b3db708 CG	303	release_mem_region(l1_dirbase, l1_size);
	304	err:
	305	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
	306	return rc;
	307	}
	308
	309	static void __exit extlog_exit(void)
	310	{
bffc7dec	311	edac_set_report_status(old_edac_report_status);
4b3db708 CG	312	mce_unregister_decode_chain(&extlog_mce_dec);
	313	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
	314	if (extlog_l1_addr)
a238317c	315	acpi_os_unmap_iomem(extlog_l1_addr, l1_size);
4b3db708	316	if (elog_addr)
a238317c	317	acpi_os_unmap_iomem(elog_addr, elog_size);
4b3db708 CG	318	release_mem_region(elog_base, elog_size);
	319	release_mem_region(l1_dirbase, l1_size);
	320	kfree(elog_buf);
	321	}
	322
	323	module_init(extlog_init);
	324	module_exit(extlog_exit);
	325
	326	MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
	327	MODULE_DESCRIPTION("Extended MCA Error Log Driver");
	328	MODULE_LICENSE("GPL");