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kernel/linux-imx6_3.14.28/drivers/acpi/acpi_extlog.c 7.88 KB
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  /*
   * 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 <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_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
  "
  
  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_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
  ", 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 bool __init extlog_get_l1addr(void)
  {
  	u8 uuid[16];
  	acpi_handle handle;
  	union acpi_object *obj;
  
  	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
  
  	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
  		return false;
  	if (!acpi_check_dsm(handle, uuid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
  		return false;
  	obj = acpi_evaluate_dsm_typed(handle, uuid, 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
  ",
  			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.
  ");
  		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
  ");
  	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");