856 lines
20 KiB
C
856 lines
20 KiB
C
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/*
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* APEI Error Record Serialization Table support
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*
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* ERST is a way provided by APEI to save and retrieve hardware error
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* infomation to and from a persistent store.
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*
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* For more information about ERST, please refer to ACPI Specification
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* version 4.0, section 17.4.
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*
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* Copyright 2010 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/acpi.h>
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#include <linux/uaccess.h>
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#include <linux/cper.h>
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#include <linux/nmi.h>
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#include <acpi/apei.h>
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#include "apei-internal.h"
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#define ERST_PFX "ERST: "
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/* ERST command status */
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#define ERST_STATUS_SUCCESS 0x0
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#define ERST_STATUS_NOT_ENOUGH_SPACE 0x1
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#define ERST_STATUS_HARDWARE_NOT_AVAILABLE 0x2
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#define ERST_STATUS_FAILED 0x3
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#define ERST_STATUS_RECORD_STORE_EMPTY 0x4
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#define ERST_STATUS_RECORD_NOT_FOUND 0x5
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#define ERST_TAB_ENTRY(tab) \
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((struct acpi_whea_header *)((char *)(tab) + \
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sizeof(struct acpi_table_erst)))
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#define SPIN_UNIT 100 /* 100ns */
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/* Firmware should respond within 1 miliseconds */
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#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
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#define FIRMWARE_MAX_STALL 50 /* 50us */
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int erst_disable;
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EXPORT_SYMBOL_GPL(erst_disable);
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static struct acpi_table_erst *erst_tab;
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/* ERST Error Log Address Range atrributes */
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#define ERST_RANGE_RESERVED 0x0001
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#define ERST_RANGE_NVRAM 0x0002
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#define ERST_RANGE_SLOW 0x0004
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/*
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* ERST Error Log Address Range, used as buffer for reading/writing
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* error records.
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*/
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static struct erst_erange {
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u64 base;
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u64 size;
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void __iomem *vaddr;
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u32 attr;
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} erst_erange;
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/*
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* Prevent ERST interpreter to run simultaneously, because the
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* corresponding firmware implementation may not work properly when
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* invoked simultaneously.
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*
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* It is used to provide exclusive accessing for ERST Error Log
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* Address Range too.
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*/
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static DEFINE_SPINLOCK(erst_lock);
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static inline int erst_errno(int command_status)
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{
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switch (command_status) {
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case ERST_STATUS_SUCCESS:
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return 0;
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case ERST_STATUS_HARDWARE_NOT_AVAILABLE:
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return -ENODEV;
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case ERST_STATUS_NOT_ENOUGH_SPACE:
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return -ENOSPC;
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case ERST_STATUS_RECORD_STORE_EMPTY:
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case ERST_STATUS_RECORD_NOT_FOUND:
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return -ENOENT;
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default:
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return -EINVAL;
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}
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}
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static int erst_timedout(u64 *t, u64 spin_unit)
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{
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if ((s64)*t < spin_unit) {
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pr_warning(FW_WARN ERST_PFX
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"Firmware does not respond in time\n");
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return 1;
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}
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*t -= spin_unit;
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ndelay(spin_unit);
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touch_nmi_watchdog();
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return 0;
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}
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static int erst_exec_load_var1(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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return __apei_exec_read_register(entry, &ctx->var1);
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}
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static int erst_exec_load_var2(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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return __apei_exec_read_register(entry, &ctx->var2);
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}
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static int erst_exec_store_var1(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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return __apei_exec_write_register(entry, ctx->var1);
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}
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static int erst_exec_add(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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ctx->var1 += ctx->var2;
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return 0;
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}
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static int erst_exec_subtract(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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ctx->var1 -= ctx->var2;
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return 0;
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}
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static int erst_exec_add_value(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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int rc;
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u64 val;
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rc = __apei_exec_read_register(entry, &val);
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if (rc)
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return rc;
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val += ctx->value;
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rc = __apei_exec_write_register(entry, val);
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return rc;
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}
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static int erst_exec_subtract_value(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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int rc;
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u64 val;
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rc = __apei_exec_read_register(entry, &val);
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if (rc)
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return rc;
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val -= ctx->value;
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rc = __apei_exec_write_register(entry, val);
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return rc;
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}
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static int erst_exec_stall(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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u64 stall_time;
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if (ctx->value > FIRMWARE_MAX_STALL) {
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if (!in_nmi())
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pr_warning(FW_WARN ERST_PFX
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"Too long stall time for stall instruction: %llx.\n",
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ctx->value);
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stall_time = FIRMWARE_MAX_STALL;
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} else
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stall_time = ctx->value;
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udelay(stall_time);
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return 0;
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}
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static int erst_exec_stall_while_true(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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int rc;
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u64 val;
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u64 timeout = FIRMWARE_TIMEOUT;
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u64 stall_time;
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if (ctx->var1 > FIRMWARE_MAX_STALL) {
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if (!in_nmi())
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pr_warning(FW_WARN ERST_PFX
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"Too long stall time for stall while true instruction: %llx.\n",
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ctx->var1);
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stall_time = FIRMWARE_MAX_STALL;
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} else
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stall_time = ctx->var1;
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for (;;) {
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rc = __apei_exec_read_register(entry, &val);
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if (rc)
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return rc;
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if (val != ctx->value)
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break;
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if (erst_timedout(&timeout, stall_time * NSEC_PER_USEC))
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return -EIO;
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}
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return 0;
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}
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static int erst_exec_skip_next_instruction_if_true(
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struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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int rc;
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u64 val;
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rc = __apei_exec_read_register(entry, &val);
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if (rc)
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return rc;
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if (val == ctx->value) {
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ctx->ip += 2;
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return APEI_EXEC_SET_IP;
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}
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return 0;
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}
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static int erst_exec_goto(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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ctx->ip = ctx->value;
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return APEI_EXEC_SET_IP;
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}
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static int erst_exec_set_src_address_base(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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return __apei_exec_read_register(entry, &ctx->src_base);
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}
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static int erst_exec_set_dst_address_base(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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return __apei_exec_read_register(entry, &ctx->dst_base);
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}
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static int erst_exec_move_data(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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int rc;
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u64 offset;
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rc = __apei_exec_read_register(entry, &offset);
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if (rc)
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return rc;
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memmove((void *)ctx->dst_base + offset,
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(void *)ctx->src_base + offset,
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ctx->var2);
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return 0;
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}
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static struct apei_exec_ins_type erst_ins_type[] = {
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[ACPI_ERST_READ_REGISTER] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = apei_exec_read_register,
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},
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[ACPI_ERST_READ_REGISTER_VALUE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = apei_exec_read_register_value,
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},
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[ACPI_ERST_WRITE_REGISTER] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = apei_exec_write_register,
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},
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[ACPI_ERST_WRITE_REGISTER_VALUE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = apei_exec_write_register_value,
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},
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[ACPI_ERST_NOOP] = {
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.flags = 0,
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.run = apei_exec_noop,
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},
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[ACPI_ERST_LOAD_VAR1] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_load_var1,
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},
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[ACPI_ERST_LOAD_VAR2] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_load_var2,
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},
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[ACPI_ERST_STORE_VAR1] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_store_var1,
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},
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[ACPI_ERST_ADD] = {
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.flags = 0,
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.run = erst_exec_add,
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},
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[ACPI_ERST_SUBTRACT] = {
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.flags = 0,
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.run = erst_exec_subtract,
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},
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[ACPI_ERST_ADD_VALUE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_add_value,
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},
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[ACPI_ERST_SUBTRACT_VALUE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_subtract_value,
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},
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[ACPI_ERST_STALL] = {
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.flags = 0,
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.run = erst_exec_stall,
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},
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[ACPI_ERST_STALL_WHILE_TRUE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_stall_while_true,
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},
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[ACPI_ERST_SKIP_NEXT_IF_TRUE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_skip_next_instruction_if_true,
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},
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[ACPI_ERST_GOTO] = {
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.flags = 0,
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.run = erst_exec_goto,
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},
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[ACPI_ERST_SET_SRC_ADDRESS_BASE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_set_src_address_base,
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},
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[ACPI_ERST_SET_DST_ADDRESS_BASE] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_set_dst_address_base,
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},
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[ACPI_ERST_MOVE_DATA] = {
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.flags = APEI_EXEC_INS_ACCESS_REGISTER,
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.run = erst_exec_move_data,
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},
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};
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static inline void erst_exec_ctx_init(struct apei_exec_context *ctx)
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{
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apei_exec_ctx_init(ctx, erst_ins_type, ARRAY_SIZE(erst_ins_type),
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ERST_TAB_ENTRY(erst_tab), erst_tab->entries);
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}
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static int erst_get_erange(struct erst_erange *range)
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{
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struct apei_exec_context ctx;
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int rc;
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erst_exec_ctx_init(&ctx);
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rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_RANGE);
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if (rc)
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return rc;
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range->base = apei_exec_ctx_get_output(&ctx);
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rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_LENGTH);
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if (rc)
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return rc;
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range->size = apei_exec_ctx_get_output(&ctx);
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rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_ATTRIBUTES);
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if (rc)
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return rc;
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range->attr = apei_exec_ctx_get_output(&ctx);
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return 0;
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}
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static ssize_t __erst_get_record_count(void)
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{
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struct apei_exec_context ctx;
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int rc;
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erst_exec_ctx_init(&ctx);
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rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_COUNT);
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if (rc)
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return rc;
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return apei_exec_ctx_get_output(&ctx);
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}
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ssize_t erst_get_record_count(void)
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{
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ssize_t count;
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unsigned long flags;
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if (erst_disable)
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return -ENODEV;
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spin_lock_irqsave(&erst_lock, flags);
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count = __erst_get_record_count();
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spin_unlock_irqrestore(&erst_lock, flags);
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return count;
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}
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EXPORT_SYMBOL_GPL(erst_get_record_count);
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static int __erst_get_next_record_id(u64 *record_id)
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{
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struct apei_exec_context ctx;
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int rc;
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erst_exec_ctx_init(&ctx);
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rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_ID);
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if (rc)
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return rc;
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*record_id = apei_exec_ctx_get_output(&ctx);
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return 0;
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}
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/*
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* Get the record ID of an existing error record on the persistent
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* storage. If there is no error record on the persistent storage, the
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* returned record_id is APEI_ERST_INVALID_RECORD_ID.
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*/
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int erst_get_next_record_id(u64 *record_id)
|
||
|
{
|
||
|
int rc;
|
||
|
unsigned long flags;
|
||
|
|
||
|
if (erst_disable)
|
||
|
return -ENODEV;
|
||
|
|
||
|
spin_lock_irqsave(&erst_lock, flags);
|
||
|
rc = __erst_get_next_record_id(record_id);
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
|
||
|
return rc;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(erst_get_next_record_id);
|
||
|
|
||
|
static int __erst_write_to_storage(u64 offset)
|
||
|
{
|
||
|
struct apei_exec_context ctx;
|
||
|
u64 timeout = FIRMWARE_TIMEOUT;
|
||
|
u64 val;
|
||
|
int rc;
|
||
|
|
||
|
erst_exec_ctx_init(&ctx);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_WRITE);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
apei_exec_ctx_set_input(&ctx, offset);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
for (;;) {
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
val = apei_exec_ctx_get_output(&ctx);
|
||
|
if (!val)
|
||
|
break;
|
||
|
if (erst_timedout(&timeout, SPIN_UNIT))
|
||
|
return -EIO;
|
||
|
}
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
val = apei_exec_ctx_get_output(&ctx);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_END);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
return erst_errno(val);
|
||
|
}
|
||
|
|
||
|
static int __erst_read_from_storage(u64 record_id, u64 offset)
|
||
|
{
|
||
|
struct apei_exec_context ctx;
|
||
|
u64 timeout = FIRMWARE_TIMEOUT;
|
||
|
u64 val;
|
||
|
int rc;
|
||
|
|
||
|
erst_exec_ctx_init(&ctx);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_READ);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
apei_exec_ctx_set_input(&ctx, offset);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
apei_exec_ctx_set_input(&ctx, record_id);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
for (;;) {
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
val = apei_exec_ctx_get_output(&ctx);
|
||
|
if (!val)
|
||
|
break;
|
||
|
if (erst_timedout(&timeout, SPIN_UNIT))
|
||
|
return -EIO;
|
||
|
};
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
val = apei_exec_ctx_get_output(&ctx);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_END);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
return erst_errno(val);
|
||
|
}
|
||
|
|
||
|
static int __erst_clear_from_storage(u64 record_id)
|
||
|
{
|
||
|
struct apei_exec_context ctx;
|
||
|
u64 timeout = FIRMWARE_TIMEOUT;
|
||
|
u64 val;
|
||
|
int rc;
|
||
|
|
||
|
erst_exec_ctx_init(&ctx);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_CLEAR);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
apei_exec_ctx_set_input(&ctx, record_id);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
for (;;) {
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
val = apei_exec_ctx_get_output(&ctx);
|
||
|
if (!val)
|
||
|
break;
|
||
|
if (erst_timedout(&timeout, SPIN_UNIT))
|
||
|
return -EIO;
|
||
|
}
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
val = apei_exec_ctx_get_output(&ctx);
|
||
|
rc = apei_exec_run(&ctx, ACPI_ERST_END);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
return erst_errno(val);
|
||
|
}
|
||
|
|
||
|
/* NVRAM ERST Error Log Address Range is not supported yet */
|
||
|
static void pr_unimpl_nvram(void)
|
||
|
{
|
||
|
if (printk_ratelimit())
|
||
|
pr_warning(ERST_PFX
|
||
|
"NVRAM ERST Log Address Range is not implemented yet\n");
|
||
|
}
|
||
|
|
||
|
static int __erst_write_to_nvram(const struct cper_record_header *record)
|
||
|
{
|
||
|
/* do not print message, because printk is not safe for NMI */
|
||
|
return -ENOSYS;
|
||
|
}
|
||
|
|
||
|
static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset)
|
||
|
{
|
||
|
pr_unimpl_nvram();
|
||
|
return -ENOSYS;
|
||
|
}
|
||
|
|
||
|
static int __erst_clear_from_nvram(u64 record_id)
|
||
|
{
|
||
|
pr_unimpl_nvram();
|
||
|
return -ENOSYS;
|
||
|
}
|
||
|
|
||
|
int erst_write(const struct cper_record_header *record)
|
||
|
{
|
||
|
int rc;
|
||
|
unsigned long flags;
|
||
|
struct cper_record_header *rcd_erange;
|
||
|
|
||
|
if (erst_disable)
|
||
|
return -ENODEV;
|
||
|
|
||
|
if (memcmp(record->signature, CPER_SIG_RECORD, CPER_SIG_SIZE))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (erst_erange.attr & ERST_RANGE_NVRAM) {
|
||
|
if (!spin_trylock_irqsave(&erst_lock, flags))
|
||
|
return -EBUSY;
|
||
|
rc = __erst_write_to_nvram(record);
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
if (record->record_length > erst_erange.size)
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (!spin_trylock_irqsave(&erst_lock, flags))
|
||
|
return -EBUSY;
|
||
|
memcpy(erst_erange.vaddr, record, record->record_length);
|
||
|
rcd_erange = erst_erange.vaddr;
|
||
|
/* signature for serialization system */
|
||
|
memcpy(&rcd_erange->persistence_information, "ER", 2);
|
||
|
|
||
|
rc = __erst_write_to_storage(0);
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
|
||
|
return rc;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(erst_write);
|
||
|
|
||
|
static int __erst_read_to_erange(u64 record_id, u64 *offset)
|
||
|
{
|
||
|
int rc;
|
||
|
|
||
|
if (erst_erange.attr & ERST_RANGE_NVRAM)
|
||
|
return __erst_read_to_erange_from_nvram(
|
||
|
record_id, offset);
|
||
|
|
||
|
rc = __erst_read_from_storage(record_id, 0);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
*offset = 0;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static ssize_t __erst_read(u64 record_id, struct cper_record_header *record,
|
||
|
size_t buflen)
|
||
|
{
|
||
|
int rc;
|
||
|
u64 offset, len = 0;
|
||
|
struct cper_record_header *rcd_tmp;
|
||
|
|
||
|
rc = __erst_read_to_erange(record_id, &offset);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
rcd_tmp = erst_erange.vaddr + offset;
|
||
|
len = rcd_tmp->record_length;
|
||
|
if (len <= buflen)
|
||
|
memcpy(record, rcd_tmp, len);
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* If return value > buflen, the buffer size is not big enough,
|
||
|
* else if return value < 0, something goes wrong,
|
||
|
* else everything is OK, and return value is record length
|
||
|
*/
|
||
|
ssize_t erst_read(u64 record_id, struct cper_record_header *record,
|
||
|
size_t buflen)
|
||
|
{
|
||
|
ssize_t len;
|
||
|
unsigned long flags;
|
||
|
|
||
|
if (erst_disable)
|
||
|
return -ENODEV;
|
||
|
|
||
|
spin_lock_irqsave(&erst_lock, flags);
|
||
|
len = __erst_read(record_id, record, buflen);
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
return len;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(erst_read);
|
||
|
|
||
|
/*
|
||
|
* If return value > buflen, the buffer size is not big enough,
|
||
|
* else if return value = 0, there is no more record to read,
|
||
|
* else if return value < 0, something goes wrong,
|
||
|
* else everything is OK, and return value is record length
|
||
|
*/
|
||
|
ssize_t erst_read_next(struct cper_record_header *record, size_t buflen)
|
||
|
{
|
||
|
int rc;
|
||
|
ssize_t len;
|
||
|
unsigned long flags;
|
||
|
u64 record_id;
|
||
|
|
||
|
if (erst_disable)
|
||
|
return -ENODEV;
|
||
|
|
||
|
spin_lock_irqsave(&erst_lock, flags);
|
||
|
rc = __erst_get_next_record_id(&record_id);
|
||
|
if (rc) {
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
return rc;
|
||
|
}
|
||
|
/* no more record */
|
||
|
if (record_id == APEI_ERST_INVALID_RECORD_ID) {
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
len = __erst_read(record_id, record, buflen);
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(erst_read_next);
|
||
|
|
||
|
int erst_clear(u64 record_id)
|
||
|
{
|
||
|
int rc;
|
||
|
unsigned long flags;
|
||
|
|
||
|
if (erst_disable)
|
||
|
return -ENODEV;
|
||
|
|
||
|
spin_lock_irqsave(&erst_lock, flags);
|
||
|
if (erst_erange.attr & ERST_RANGE_NVRAM)
|
||
|
rc = __erst_clear_from_nvram(record_id);
|
||
|
else
|
||
|
rc = __erst_clear_from_storage(record_id);
|
||
|
spin_unlock_irqrestore(&erst_lock, flags);
|
||
|
|
||
|
return rc;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(erst_clear);
|
||
|
|
||
|
static int __init setup_erst_disable(char *str)
|
||
|
{
|
||
|
erst_disable = 1;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
__setup("erst_disable", setup_erst_disable);
|
||
|
|
||
|
static int erst_check_table(struct acpi_table_erst *erst_tab)
|
||
|
{
|
||
|
if (erst_tab->header_length != sizeof(struct acpi_table_erst))
|
||
|
return -EINVAL;
|
||
|
if (erst_tab->header.length < sizeof(struct acpi_table_erst))
|
||
|
return -EINVAL;
|
||
|
if (erst_tab->entries !=
|
||
|
(erst_tab->header.length - sizeof(struct acpi_table_erst)) /
|
||
|
sizeof(struct acpi_erst_entry))
|
||
|
return -EINVAL;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int __init erst_init(void)
|
||
|
{
|
||
|
int rc = 0;
|
||
|
acpi_status status;
|
||
|
struct apei_exec_context ctx;
|
||
|
struct apei_resources erst_resources;
|
||
|
struct resource *r;
|
||
|
|
||
|
if (acpi_disabled)
|
||
|
goto err;
|
||
|
|
||
|
if (erst_disable) {
|
||
|
pr_info(ERST_PFX
|
||
|
"Error Record Serialization Table (ERST) support is disabled.\n");
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
status = acpi_get_table(ACPI_SIG_ERST, 0,
|
||
|
(struct acpi_table_header **)&erst_tab);
|
||
|
if (status == AE_NOT_FOUND) {
|
||
|
pr_err(ERST_PFX "Table is not found!\n");
|
||
|
goto err;
|
||
|
} else if (ACPI_FAILURE(status)) {
|
||
|
const char *msg = acpi_format_exception(status);
|
||
|
pr_err(ERST_PFX "Failed to get table, %s\n", msg);
|
||
|
rc = -EINVAL;
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
rc = erst_check_table(erst_tab);
|
||
|
if (rc) {
|
||
|
pr_err(FW_BUG ERST_PFX "ERST table is invalid\n");
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
apei_resources_init(&erst_resources);
|
||
|
erst_exec_ctx_init(&ctx);
|
||
|
rc = apei_exec_collect_resources(&ctx, &erst_resources);
|
||
|
if (rc)
|
||
|
goto err_fini;
|
||
|
rc = apei_resources_request(&erst_resources, "APEI ERST");
|
||
|
if (rc)
|
||
|
goto err_fini;
|
||
|
rc = apei_exec_pre_map_gars(&ctx);
|
||
|
if (rc)
|
||
|
goto err_release;
|
||
|
rc = erst_get_erange(&erst_erange);
|
||
|
if (rc) {
|
||
|
if (rc == -ENODEV)
|
||
|
pr_info(ERST_PFX
|
||
|
"The corresponding hardware device or firmware implementation "
|
||
|
"is not available.\n");
|
||
|
else
|
||
|
pr_err(ERST_PFX
|
||
|
"Failed to get Error Log Address Range.\n");
|
||
|
goto err_unmap_reg;
|
||
|
}
|
||
|
|
||
|
r = request_mem_region(erst_erange.base, erst_erange.size, "APEI ERST");
|
||
|
if (!r) {
|
||
|
pr_err(ERST_PFX
|
||
|
"Can not request iomem region <0x%16llx-0x%16llx> for ERST.\n",
|
||
|
(unsigned long long)erst_erange.base,
|
||
|
(unsigned long long)erst_erange.base + erst_erange.size);
|
||
|
rc = -EIO;
|
||
|
goto err_unmap_reg;
|
||
|
}
|
||
|
rc = -ENOMEM;
|
||
|
erst_erange.vaddr = ioremap_cache(erst_erange.base,
|
||
|
erst_erange.size);
|
||
|
if (!erst_erange.vaddr)
|
||
|
goto err_release_erange;
|
||
|
|
||
|
pr_info(ERST_PFX
|
||
|
"Error Record Serialization Table (ERST) support is initialized.\n");
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
err_release_erange:
|
||
|
release_mem_region(erst_erange.base, erst_erange.size);
|
||
|
err_unmap_reg:
|
||
|
apei_exec_post_unmap_gars(&ctx);
|
||
|
err_release:
|
||
|
apei_resources_release(&erst_resources);
|
||
|
err_fini:
|
||
|
apei_resources_fini(&erst_resources);
|
||
|
err:
|
||
|
erst_disable = 1;
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
device_initcall(erst_init);
|