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![Josh Hunt](/assets/img/avatar_default.png)
We leak the NVS and arch resources (if used), in apei_resources_request. They are allocated to make sure we exclude them from the APEI resources, but they are never freed at the end of the function. Free them now. Signed-off-by: Josh Hunt <johunt@akamai.com> Reviewed-by: Chen, Gong <gong.chen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
803 lines
20 KiB
C
803 lines
20 KiB
C
/*
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* apei-base.c - ACPI Platform Error Interface (APEI) supporting
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* infrastructure
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*
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* APEI allows to report errors (for example from the chipset) to the
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* the operating system. This improves NMI handling especially. In
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* addition it supports error serialization and error injection.
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*
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* For more information about APEI, please refer to ACPI Specification
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* version 4.0, chapter 17.
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*
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* This file has Common functions used by more than one APEI table,
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* including framework of interpreter for ERST and EINJ; resource
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* management for APEI registers.
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*
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* Copyright (C) 2009, 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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#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/acpi.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/kref.h>
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#include <linux/rculist.h>
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#include <linux/interrupt.h>
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#include <linux/debugfs.h>
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#include <asm/unaligned.h>
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#include "apei-internal.h"
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#define APEI_PFX "APEI: "
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/*
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* APEI ERST (Error Record Serialization Table) and EINJ (Error
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* INJection) interpreter framework.
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*/
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#define APEI_EXEC_PRESERVE_REGISTER 0x1
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void apei_exec_ctx_init(struct apei_exec_context *ctx,
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struct apei_exec_ins_type *ins_table,
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u32 instructions,
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struct acpi_whea_header *action_table,
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u32 entries)
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{
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ctx->ins_table = ins_table;
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ctx->instructions = instructions;
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ctx->action_table = action_table;
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ctx->entries = entries;
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}
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EXPORT_SYMBOL_GPL(apei_exec_ctx_init);
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int __apei_exec_read_register(struct acpi_whea_header *entry, u64 *val)
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{
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int rc;
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rc = apei_read(val, &entry->register_region);
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if (rc)
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return rc;
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*val >>= entry->register_region.bit_offset;
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*val &= entry->mask;
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return 0;
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}
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int apei_exec_read_register(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 = 0;
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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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ctx->value = val;
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return 0;
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}
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EXPORT_SYMBOL_GPL(apei_exec_read_register);
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int apei_exec_read_register_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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rc = apei_exec_read_register(ctx, entry);
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if (rc)
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return rc;
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ctx->value = (ctx->value == entry->value);
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return 0;
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}
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EXPORT_SYMBOL_GPL(apei_exec_read_register_value);
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int __apei_exec_write_register(struct acpi_whea_header *entry, u64 val)
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{
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int rc;
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val &= entry->mask;
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val <<= entry->register_region.bit_offset;
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if (entry->flags & APEI_EXEC_PRESERVE_REGISTER) {
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u64 valr = 0;
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rc = apei_read(&valr, &entry->register_region);
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if (rc)
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return rc;
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valr &= ~(entry->mask << entry->register_region.bit_offset);
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val |= valr;
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}
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rc = apei_write(val, &entry->register_region);
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return rc;
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}
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int apei_exec_write_register(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->value);
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}
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EXPORT_SYMBOL_GPL(apei_exec_write_register);
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int apei_exec_write_register_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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ctx->value = entry->value;
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rc = apei_exec_write_register(ctx, entry);
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return rc;
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}
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EXPORT_SYMBOL_GPL(apei_exec_write_register_value);
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int apei_exec_noop(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry)
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{
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return 0;
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}
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EXPORT_SYMBOL_GPL(apei_exec_noop);
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/*
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* Interpret the specified action. Go through whole action table,
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* execute all instructions belong to the action.
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*/
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int __apei_exec_run(struct apei_exec_context *ctx, u8 action,
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bool optional)
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{
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int rc = -ENOENT;
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u32 i, ip;
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struct acpi_whea_header *entry;
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apei_exec_ins_func_t run;
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ctx->ip = 0;
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/*
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* "ip" is the instruction pointer of current instruction,
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* "ctx->ip" specifies the next instruction to executed,
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* instruction "run" function may change the "ctx->ip" to
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* implement "goto" semantics.
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*/
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rewind:
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ip = 0;
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for (i = 0; i < ctx->entries; i++) {
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entry = &ctx->action_table[i];
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if (entry->action != action)
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continue;
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if (ip == ctx->ip) {
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if (entry->instruction >= ctx->instructions ||
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!ctx->ins_table[entry->instruction].run) {
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pr_warning(FW_WARN APEI_PFX
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"Invalid action table, unknown instruction type: %d\n",
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entry->instruction);
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return -EINVAL;
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}
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run = ctx->ins_table[entry->instruction].run;
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rc = run(ctx, entry);
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if (rc < 0)
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return rc;
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else if (rc != APEI_EXEC_SET_IP)
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ctx->ip++;
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}
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ip++;
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if (ctx->ip < ip)
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goto rewind;
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}
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return !optional && rc < 0 ? rc : 0;
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}
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EXPORT_SYMBOL_GPL(__apei_exec_run);
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typedef int (*apei_exec_entry_func_t)(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry,
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void *data);
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static int apei_exec_for_each_entry(struct apei_exec_context *ctx,
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apei_exec_entry_func_t func,
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void *data,
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int *end)
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{
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u8 ins;
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int i, rc;
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struct acpi_whea_header *entry;
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struct apei_exec_ins_type *ins_table = ctx->ins_table;
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for (i = 0; i < ctx->entries; i++) {
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entry = ctx->action_table + i;
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ins = entry->instruction;
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if (end)
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*end = i;
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if (ins >= ctx->instructions || !ins_table[ins].run) {
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pr_warning(FW_WARN APEI_PFX
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"Invalid action table, unknown instruction type: %d\n",
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ins);
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return -EINVAL;
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}
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rc = func(ctx, entry, data);
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if (rc)
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return rc;
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}
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return 0;
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}
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static int pre_map_gar_callback(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry,
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void *data)
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{
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u8 ins = entry->instruction;
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if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER)
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return apei_map_generic_address(&entry->register_region);
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return 0;
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}
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/*
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* Pre-map all GARs in action table to make it possible to access them
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* in NMI handler.
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*/
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int apei_exec_pre_map_gars(struct apei_exec_context *ctx)
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{
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int rc, end;
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rc = apei_exec_for_each_entry(ctx, pre_map_gar_callback,
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NULL, &end);
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if (rc) {
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struct apei_exec_context ctx_unmap;
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memcpy(&ctx_unmap, ctx, sizeof(*ctx));
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ctx_unmap.entries = end;
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apei_exec_post_unmap_gars(&ctx_unmap);
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}
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return rc;
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}
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EXPORT_SYMBOL_GPL(apei_exec_pre_map_gars);
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static int post_unmap_gar_callback(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry,
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void *data)
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{
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u8 ins = entry->instruction;
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if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER)
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apei_unmap_generic_address(&entry->register_region);
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return 0;
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}
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/* Post-unmap all GAR in action table. */
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int apei_exec_post_unmap_gars(struct apei_exec_context *ctx)
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{
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return apei_exec_for_each_entry(ctx, post_unmap_gar_callback,
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NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(apei_exec_post_unmap_gars);
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/*
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* Resource management for GARs in APEI
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*/
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struct apei_res {
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struct list_head list;
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unsigned long start;
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unsigned long end;
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};
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/* Collect all resources requested, to avoid conflict */
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struct apei_resources apei_resources_all = {
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.iomem = LIST_HEAD_INIT(apei_resources_all.iomem),
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.ioport = LIST_HEAD_INIT(apei_resources_all.ioport),
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};
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static int apei_res_add(struct list_head *res_list,
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unsigned long start, unsigned long size)
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{
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struct apei_res *res, *resn, *res_ins = NULL;
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unsigned long end = start + size;
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if (end <= start)
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return 0;
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repeat:
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list_for_each_entry_safe(res, resn, res_list, list) {
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if (res->start > end || res->end < start)
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continue;
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else if (end <= res->end && start >= res->start) {
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kfree(res_ins);
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return 0;
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}
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list_del(&res->list);
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res->start = start = min(res->start, start);
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res->end = end = max(res->end, end);
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kfree(res_ins);
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res_ins = res;
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goto repeat;
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}
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if (res_ins)
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list_add(&res_ins->list, res_list);
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else {
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res_ins = kmalloc(sizeof(*res), GFP_KERNEL);
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if (!res_ins)
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return -ENOMEM;
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res_ins->start = start;
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res_ins->end = end;
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list_add(&res_ins->list, res_list);
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}
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return 0;
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}
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static int apei_res_sub(struct list_head *res_list1,
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struct list_head *res_list2)
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{
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struct apei_res *res1, *resn1, *res2, *res;
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res1 = list_entry(res_list1->next, struct apei_res, list);
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resn1 = list_entry(res1->list.next, struct apei_res, list);
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while (&res1->list != res_list1) {
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list_for_each_entry(res2, res_list2, list) {
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if (res1->start >= res2->end ||
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res1->end <= res2->start)
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continue;
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else if (res1->end <= res2->end &&
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res1->start >= res2->start) {
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list_del(&res1->list);
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kfree(res1);
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break;
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} else if (res1->end > res2->end &&
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res1->start < res2->start) {
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res = kmalloc(sizeof(*res), GFP_KERNEL);
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if (!res)
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return -ENOMEM;
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res->start = res2->end;
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res->end = res1->end;
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res1->end = res2->start;
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list_add(&res->list, &res1->list);
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resn1 = res;
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} else {
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if (res1->start < res2->start)
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res1->end = res2->start;
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else
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res1->start = res2->end;
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}
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}
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res1 = resn1;
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resn1 = list_entry(resn1->list.next, struct apei_res, list);
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}
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return 0;
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}
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static void apei_res_clean(struct list_head *res_list)
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{
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struct apei_res *res, *resn;
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list_for_each_entry_safe(res, resn, res_list, list) {
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list_del(&res->list);
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kfree(res);
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}
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}
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void apei_resources_fini(struct apei_resources *resources)
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{
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apei_res_clean(&resources->iomem);
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apei_res_clean(&resources->ioport);
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}
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EXPORT_SYMBOL_GPL(apei_resources_fini);
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static int apei_resources_merge(struct apei_resources *resources1,
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struct apei_resources *resources2)
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{
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int rc;
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struct apei_res *res;
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list_for_each_entry(res, &resources2->iomem, list) {
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rc = apei_res_add(&resources1->iomem, res->start,
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res->end - res->start);
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if (rc)
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return rc;
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}
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list_for_each_entry(res, &resources2->ioport, list) {
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rc = apei_res_add(&resources1->ioport, res->start,
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res->end - res->start);
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if (rc)
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return rc;
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}
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return 0;
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}
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int apei_resources_add(struct apei_resources *resources,
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unsigned long start, unsigned long size,
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bool iomem)
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{
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if (iomem)
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return apei_res_add(&resources->iomem, start, size);
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else
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return apei_res_add(&resources->ioport, start, size);
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}
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EXPORT_SYMBOL_GPL(apei_resources_add);
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/*
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* EINJ has two groups of GARs (EINJ table entry and trigger table
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* entry), so common resources are subtracted from the trigger table
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* resources before the second requesting.
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*/
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int apei_resources_sub(struct apei_resources *resources1,
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struct apei_resources *resources2)
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{
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int rc;
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rc = apei_res_sub(&resources1->iomem, &resources2->iomem);
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if (rc)
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return rc;
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return apei_res_sub(&resources1->ioport, &resources2->ioport);
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}
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EXPORT_SYMBOL_GPL(apei_resources_sub);
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static int apei_get_res_callback(__u64 start, __u64 size, void *data)
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{
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struct apei_resources *resources = data;
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return apei_res_add(&resources->iomem, start, size);
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}
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static int apei_get_nvs_resources(struct apei_resources *resources)
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{
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return acpi_nvs_for_each_region(apei_get_res_callback, resources);
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}
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int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size,
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void *data), void *data);
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static int apei_get_arch_resources(struct apei_resources *resources)
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{
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return arch_apei_filter_addr(apei_get_res_callback, resources);
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}
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/*
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* IO memory/port resource management mechanism is used to check
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* whether memory/port area used by GARs conflicts with normal memory
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* or IO memory/port of devices.
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*/
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int apei_resources_request(struct apei_resources *resources,
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const char *desc)
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{
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struct apei_res *res, *res_bak = NULL;
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struct resource *r;
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struct apei_resources nvs_resources, arch_res;
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int rc;
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rc = apei_resources_sub(resources, &apei_resources_all);
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if (rc)
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return rc;
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/*
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* Some firmware uses ACPI NVS region, that has been marked as
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* busy, so exclude it from APEI resources to avoid false
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* conflict.
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*/
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apei_resources_init(&nvs_resources);
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rc = apei_get_nvs_resources(&nvs_resources);
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if (rc)
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goto nvs_res_fini;
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rc = apei_resources_sub(resources, &nvs_resources);
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if (rc)
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goto nvs_res_fini;
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if (arch_apei_filter_addr) {
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apei_resources_init(&arch_res);
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rc = apei_get_arch_resources(&arch_res);
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if (rc)
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goto arch_res_fini;
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rc = apei_resources_sub(resources, &arch_res);
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if (rc)
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goto arch_res_fini;
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}
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rc = -EINVAL;
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list_for_each_entry(res, &resources->iomem, list) {
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r = request_mem_region(res->start, res->end - res->start,
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desc);
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if (!r) {
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pr_err(APEI_PFX
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"Can not request [mem %#010llx-%#010llx] for %s registers\n",
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(unsigned long long)res->start,
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(unsigned long long)res->end - 1, desc);
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res_bak = res;
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goto err_unmap_iomem;
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}
|
|
}
|
|
|
|
list_for_each_entry(res, &resources->ioport, list) {
|
|
r = request_region(res->start, res->end - res->start, desc);
|
|
if (!r) {
|
|
pr_err(APEI_PFX
|
|
"Can not request [io %#06llx-%#06llx] for %s registers\n",
|
|
(unsigned long long)res->start,
|
|
(unsigned long long)res->end - 1, desc);
|
|
res_bak = res;
|
|
goto err_unmap_ioport;
|
|
}
|
|
}
|
|
|
|
rc = apei_resources_merge(&apei_resources_all, resources);
|
|
if (rc) {
|
|
pr_err(APEI_PFX "Fail to merge resources!\n");
|
|
goto err_unmap_ioport;
|
|
}
|
|
|
|
goto arch_res_fini;
|
|
|
|
err_unmap_ioport:
|
|
list_for_each_entry(res, &resources->ioport, list) {
|
|
if (res == res_bak)
|
|
break;
|
|
release_region(res->start, res->end - res->start);
|
|
}
|
|
res_bak = NULL;
|
|
err_unmap_iomem:
|
|
list_for_each_entry(res, &resources->iomem, list) {
|
|
if (res == res_bak)
|
|
break;
|
|
release_mem_region(res->start, res->end - res->start);
|
|
}
|
|
arch_res_fini:
|
|
if (arch_apei_filter_addr)
|
|
apei_resources_fini(&arch_res);
|
|
nvs_res_fini:
|
|
apei_resources_fini(&nvs_resources);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_resources_request);
|
|
|
|
void apei_resources_release(struct apei_resources *resources)
|
|
{
|
|
int rc;
|
|
struct apei_res *res;
|
|
|
|
list_for_each_entry(res, &resources->iomem, list)
|
|
release_mem_region(res->start, res->end - res->start);
|
|
list_for_each_entry(res, &resources->ioport, list)
|
|
release_region(res->start, res->end - res->start);
|
|
|
|
rc = apei_resources_sub(&apei_resources_all, resources);
|
|
if (rc)
|
|
pr_err(APEI_PFX "Fail to sub resources!\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_resources_release);
|
|
|
|
static int apei_check_gar(struct acpi_generic_address *reg, u64 *paddr,
|
|
u32 *access_bit_width)
|
|
{
|
|
u32 bit_width, bit_offset, access_size_code, space_id;
|
|
|
|
bit_width = reg->bit_width;
|
|
bit_offset = reg->bit_offset;
|
|
access_size_code = reg->access_width;
|
|
space_id = reg->space_id;
|
|
*paddr = get_unaligned(®->address);
|
|
if (!*paddr) {
|
|
pr_warning(FW_BUG APEI_PFX
|
|
"Invalid physical address in GAR [0x%llx/%u/%u/%u/%u]\n",
|
|
*paddr, bit_width, bit_offset, access_size_code,
|
|
space_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (access_size_code < 1 || access_size_code > 4) {
|
|
pr_warning(FW_BUG APEI_PFX
|
|
"Invalid access size code in GAR [0x%llx/%u/%u/%u/%u]\n",
|
|
*paddr, bit_width, bit_offset, access_size_code,
|
|
space_id);
|
|
return -EINVAL;
|
|
}
|
|
*access_bit_width = 1UL << (access_size_code + 2);
|
|
|
|
/* Fixup common BIOS bug */
|
|
if (bit_width == 32 && bit_offset == 0 && (*paddr & 0x03) == 0 &&
|
|
*access_bit_width < 32)
|
|
*access_bit_width = 32;
|
|
else if (bit_width == 64 && bit_offset == 0 && (*paddr & 0x07) == 0 &&
|
|
*access_bit_width < 64)
|
|
*access_bit_width = 64;
|
|
|
|
if ((bit_width + bit_offset) > *access_bit_width) {
|
|
pr_warning(FW_BUG APEI_PFX
|
|
"Invalid bit width + offset in GAR [0x%llx/%u/%u/%u/%u]\n",
|
|
*paddr, bit_width, bit_offset, access_size_code,
|
|
space_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY &&
|
|
space_id != ACPI_ADR_SPACE_SYSTEM_IO) {
|
|
pr_warning(FW_BUG APEI_PFX
|
|
"Invalid address space type in GAR [0x%llx/%u/%u/%u/%u]\n",
|
|
*paddr, bit_width, bit_offset, access_size_code,
|
|
space_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int apei_map_generic_address(struct acpi_generic_address *reg)
|
|
{
|
|
int rc;
|
|
u32 access_bit_width;
|
|
u64 address;
|
|
|
|
rc = apei_check_gar(reg, &address, &access_bit_width);
|
|
if (rc)
|
|
return rc;
|
|
return acpi_os_map_generic_address(reg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_map_generic_address);
|
|
|
|
/* read GAR in interrupt (including NMI) or process context */
|
|
int apei_read(u64 *val, struct acpi_generic_address *reg)
|
|
{
|
|
int rc;
|
|
u32 access_bit_width;
|
|
u64 address;
|
|
acpi_status status;
|
|
|
|
rc = apei_check_gar(reg, &address, &access_bit_width);
|
|
if (rc)
|
|
return rc;
|
|
|
|
*val = 0;
|
|
switch(reg->space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
|
|
status = acpi_os_read_memory((acpi_physical_address) address,
|
|
val, access_bit_width);
|
|
if (ACPI_FAILURE(status))
|
|
return -EIO;
|
|
break;
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
status = acpi_os_read_port(address, (u32 *)val,
|
|
access_bit_width);
|
|
if (ACPI_FAILURE(status))
|
|
return -EIO;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_read);
|
|
|
|
/* write GAR in interrupt (including NMI) or process context */
|
|
int apei_write(u64 val, struct acpi_generic_address *reg)
|
|
{
|
|
int rc;
|
|
u32 access_bit_width;
|
|
u64 address;
|
|
acpi_status status;
|
|
|
|
rc = apei_check_gar(reg, &address, &access_bit_width);
|
|
if (rc)
|
|
return rc;
|
|
|
|
switch (reg->space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
|
|
status = acpi_os_write_memory((acpi_physical_address) address,
|
|
val, access_bit_width);
|
|
if (ACPI_FAILURE(status))
|
|
return -EIO;
|
|
break;
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
status = acpi_os_write_port(address, val, access_bit_width);
|
|
if (ACPI_FAILURE(status))
|
|
return -EIO;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_write);
|
|
|
|
static int collect_res_callback(struct apei_exec_context *ctx,
|
|
struct acpi_whea_header *entry,
|
|
void *data)
|
|
{
|
|
struct apei_resources *resources = data;
|
|
struct acpi_generic_address *reg = &entry->register_region;
|
|
u8 ins = entry->instruction;
|
|
u32 access_bit_width;
|
|
u64 paddr;
|
|
int rc;
|
|
|
|
if (!(ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER))
|
|
return 0;
|
|
|
|
rc = apei_check_gar(reg, &paddr, &access_bit_width);
|
|
if (rc)
|
|
return rc;
|
|
|
|
switch (reg->space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
|
|
return apei_res_add(&resources->iomem, paddr,
|
|
access_bit_width / 8);
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
return apei_res_add(&resources->ioport, paddr,
|
|
access_bit_width / 8);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Same register may be used by multiple instructions in GARs, so
|
|
* resources are collected before requesting.
|
|
*/
|
|
int apei_exec_collect_resources(struct apei_exec_context *ctx,
|
|
struct apei_resources *resources)
|
|
{
|
|
return apei_exec_for_each_entry(ctx, collect_res_callback,
|
|
resources, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_exec_collect_resources);
|
|
|
|
struct dentry *apei_get_debugfs_dir(void)
|
|
{
|
|
static struct dentry *dapei;
|
|
|
|
if (!dapei)
|
|
dapei = debugfs_create_dir("apei", NULL);
|
|
|
|
return dapei;
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_get_debugfs_dir);
|
|
|
|
int __weak arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr,
|
|
void *data)
|
|
{
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(arch_apei_enable_cmcff);
|
|
|
|
void __weak arch_apei_report_mem_error(int sev,
|
|
struct cper_sec_mem_err *mem_err)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL_GPL(arch_apei_report_mem_error);
|
|
|
|
int apei_osc_setup(void)
|
|
{
|
|
static u8 whea_uuid_str[] = "ed855e0c-6c90-47bf-a62a-26de0fc5ad5c";
|
|
acpi_handle handle;
|
|
u32 capbuf[3];
|
|
struct acpi_osc_context context = {
|
|
.uuid_str = whea_uuid_str,
|
|
.rev = 1,
|
|
.cap.length = sizeof(capbuf),
|
|
.cap.pointer = capbuf,
|
|
};
|
|
|
|
capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
|
|
capbuf[OSC_SUPPORT_DWORD] = 1;
|
|
capbuf[OSC_CONTROL_DWORD] = 0;
|
|
|
|
if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))
|
|
|| ACPI_FAILURE(acpi_run_osc(handle, &context)))
|
|
return -EIO;
|
|
else {
|
|
kfree(context.ret.pointer);
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(apei_osc_setup);
|