drivers/acpi/acpi_extlog.c - linux - Git at Google

 // 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 <acpi/ghes.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;
 	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++;
 	apei_estatus_for_each_section(tmp, gdata) {
 		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
 			fru_id = (guid_t *)gdata->fru_id;
 		else
 			fru_id = &guid_null;
 		if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
 			fru_text = gdata->fru_text;
 		else
 			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");
	// 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 <acpi/ghes.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;
	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++;
	apei_estatus_for_each_section(tmp, gdata) {
	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
	fru_id = (guid_t *)gdata->fru_id;
	else
	fru_id = &guid_null;
	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
	fru_text = gdata->fru_text;
	else
	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");