487 lines
13 KiB
C
487 lines
13 KiB
C
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/*
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* APEI Error INJection support
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*
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* EINJ provides a hardware error injection mechanism, this is useful
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* for debugging and testing of other APEI and RAS features.
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*
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* For more information about EINJ, please refer to ACPI Specification
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* version 4.0, section 17.5.
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*
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* Copyright 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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* 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/io.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/nmi.h>
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#include <linux/delay.h>
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#include <acpi/acpi.h>
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#include "apei-internal.h"
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#define EINJ_PFX "EINJ: "
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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 EINJ_OP_BUSY 0x1
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#define EINJ_STATUS_SUCCESS 0x0
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#define EINJ_STATUS_FAIL 0x1
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#define EINJ_STATUS_INVAL 0x2
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#define EINJ_TAB_ENTRY(tab) \
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((struct acpi_whea_header *)((char *)(tab) + \
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sizeof(struct acpi_table_einj)))
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static struct acpi_table_einj *einj_tab;
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static struct apei_resources einj_resources;
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static struct apei_exec_ins_type einj_ins_type[] = {
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[ACPI_EINJ_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_EINJ_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_EINJ_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_EINJ_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_EINJ_NOOP] = {
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.flags = 0,
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.run = apei_exec_noop,
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},
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};
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/*
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* Prevent EINJ 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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static DEFINE_MUTEX(einj_mutex);
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static void einj_exec_ctx_init(struct apei_exec_context *ctx)
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{
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apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
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EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
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}
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static int __einj_get_available_error_type(u32 *type)
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{
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struct apei_exec_context ctx;
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int rc;
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einj_exec_ctx_init(&ctx);
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rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
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if (rc)
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return rc;
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*type = apei_exec_ctx_get_output(&ctx);
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return 0;
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}
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/* Get error injection capabilities of the platform */
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static int einj_get_available_error_type(u32 *type)
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{
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int rc;
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mutex_lock(&einj_mutex);
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rc = __einj_get_available_error_type(type);
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mutex_unlock(&einj_mutex);
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return rc;
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}
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static int einj_timedout(u64 *t)
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{
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if ((s64)*t < SPIN_UNIT) {
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pr_warning(FW_WARN EINJ_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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/* do sanity check to trigger table */
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static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
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{
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if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
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return -EINVAL;
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if (trigger_tab->table_size > PAGE_SIZE ||
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trigger_tab->table_size <= trigger_tab->header_size)
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return -EINVAL;
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if (trigger_tab->entry_count !=
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(trigger_tab->table_size - trigger_tab->header_size) /
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sizeof(struct acpi_einj_entry))
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return -EINVAL;
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return 0;
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}
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/* Execute instructions in trigger error action table */
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static int __einj_error_trigger(u64 trigger_paddr)
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{
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struct acpi_einj_trigger *trigger_tab = NULL;
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struct apei_exec_context trigger_ctx;
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struct apei_resources trigger_resources;
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struct acpi_whea_header *trigger_entry;
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struct resource *r;
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u32 table_size;
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int rc = -EIO;
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r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
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"APEI EINJ Trigger Table");
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if (!r) {
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pr_err(EINJ_PFX
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"Can not request iomem region <%016llx-%016llx> for Trigger table.\n",
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(unsigned long long)trigger_paddr,
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(unsigned long long)trigger_paddr+sizeof(*trigger_tab));
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goto out;
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}
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trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
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if (!trigger_tab) {
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pr_err(EINJ_PFX "Failed to map trigger table!\n");
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goto out_rel_header;
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}
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rc = einj_check_trigger_header(trigger_tab);
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if (rc) {
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pr_warning(FW_BUG EINJ_PFX
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"The trigger error action table is invalid\n");
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goto out_rel_header;
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}
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rc = -EIO;
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table_size = trigger_tab->table_size;
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r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
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table_size - sizeof(*trigger_tab),
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"APEI EINJ Trigger Table");
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if (!r) {
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pr_err(EINJ_PFX
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"Can not request iomem region <%016llx-%016llx> for Trigger Table Entry.\n",
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(unsigned long long)trigger_paddr+sizeof(*trigger_tab),
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(unsigned long long)trigger_paddr + table_size);
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goto out_rel_header;
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}
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iounmap(trigger_tab);
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trigger_tab = ioremap_cache(trigger_paddr, table_size);
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if (!trigger_tab) {
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pr_err(EINJ_PFX "Failed to map trigger table!\n");
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goto out_rel_entry;
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}
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trigger_entry = (struct acpi_whea_header *)
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((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
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apei_resources_init(&trigger_resources);
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apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
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ARRAY_SIZE(einj_ins_type),
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trigger_entry, trigger_tab->entry_count);
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rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
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if (rc)
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goto out_fini;
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rc = apei_resources_sub(&trigger_resources, &einj_resources);
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if (rc)
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goto out_fini;
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rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
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if (rc)
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goto out_fini;
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rc = apei_exec_pre_map_gars(&trigger_ctx);
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if (rc)
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goto out_release;
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rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
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apei_exec_post_unmap_gars(&trigger_ctx);
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out_release:
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apei_resources_release(&trigger_resources);
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out_fini:
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apei_resources_fini(&trigger_resources);
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out_rel_entry:
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release_mem_region(trigger_paddr + sizeof(*trigger_tab),
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table_size - sizeof(*trigger_tab));
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out_rel_header:
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release_mem_region(trigger_paddr, sizeof(*trigger_tab));
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out:
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if (trigger_tab)
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iounmap(trigger_tab);
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return rc;
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}
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static int __einj_error_inject(u32 type)
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{
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struct apei_exec_context ctx;
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u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
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int rc;
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einj_exec_ctx_init(&ctx);
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rc = apei_exec_run(&ctx, ACPI_EINJ_BEGIN_OPERATION);
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if (rc)
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return rc;
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apei_exec_ctx_set_input(&ctx, type);
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rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
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if (rc)
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return rc;
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rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
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if (rc)
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return rc;
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for (;;) {
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rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
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if (rc)
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return rc;
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val = apei_exec_ctx_get_output(&ctx);
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if (!(val & EINJ_OP_BUSY))
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break;
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if (einj_timedout(&timeout))
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return -EIO;
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}
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rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
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if (rc)
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return rc;
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val = apei_exec_ctx_get_output(&ctx);
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if (val != EINJ_STATUS_SUCCESS)
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return -EBUSY;
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rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
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if (rc)
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return rc;
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trigger_paddr = apei_exec_ctx_get_output(&ctx);
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rc = __einj_error_trigger(trigger_paddr);
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if (rc)
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return rc;
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rc = apei_exec_run(&ctx, ACPI_EINJ_END_OPERATION);
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return rc;
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}
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/* Inject the specified hardware error */
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static int einj_error_inject(u32 type)
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{
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int rc;
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mutex_lock(&einj_mutex);
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rc = __einj_error_inject(type);
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mutex_unlock(&einj_mutex);
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return rc;
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}
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static u32 error_type;
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static struct dentry *einj_debug_dir;
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static int available_error_type_show(struct seq_file *m, void *v)
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{
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int rc;
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u32 available_error_type = 0;
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rc = einj_get_available_error_type(&available_error_type);
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if (rc)
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return rc;
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if (available_error_type & 0x0001)
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seq_printf(m, "0x00000001\tProcessor Correctable\n");
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if (available_error_type & 0x0002)
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seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
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if (available_error_type & 0x0004)
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seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
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if (available_error_type & 0x0008)
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seq_printf(m, "0x00000008\tMemory Correctable\n");
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if (available_error_type & 0x0010)
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seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
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if (available_error_type & 0x0020)
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seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
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if (available_error_type & 0x0040)
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seq_printf(m, "0x00000040\tPCI Express Correctable\n");
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if (available_error_type & 0x0080)
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seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
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if (available_error_type & 0x0100)
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seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
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if (available_error_type & 0x0200)
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seq_printf(m, "0x00000200\tPlatform Correctable\n");
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if (available_error_type & 0x0400)
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seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
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if (available_error_type & 0x0800)
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seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
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return 0;
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}
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static int available_error_type_open(struct inode *inode, struct file *file)
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{
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return single_open(file, available_error_type_show, NULL);
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}
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static const struct file_operations available_error_type_fops = {
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.open = available_error_type_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int error_type_get(void *data, u64 *val)
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{
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*val = error_type;
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return 0;
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}
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static int error_type_set(void *data, u64 val)
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{
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int rc;
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u32 available_error_type = 0;
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/* Only one error type can be specified */
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if (val & (val - 1))
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return -EINVAL;
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|
|
rc = einj_get_available_error_type(&available_error_type);
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
if (!(val & available_error_type))
|
||
|
|
return -EINVAL;
|
||
|
|
error_type = val;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
|
||
|
|
error_type_set, "0x%llx\n");
|
||
|
|
|
||
|
|
static int error_inject_set(void *data, u64 val)
|
||
|
|
{
|
||
|
|
if (!error_type)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return einj_error_inject(error_type);
|
||
|
|
}
|
||
|
|
|
||
|
|
DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
|
||
|
|
error_inject_set, "%llu\n");
|
||
|
|
|
||
|
|
static int einj_check_table(struct acpi_table_einj *einj_tab)
|
||
|
|
{
|
||
|
|
if (einj_tab->header_length != sizeof(struct acpi_table_einj))
|
||
|
|
return -EINVAL;
|
||
|
|
if (einj_tab->header.length < sizeof(struct acpi_table_einj))
|
||
|
|
return -EINVAL;
|
||
|
|
if (einj_tab->entries !=
|
||
|
|
(einj_tab->header.length - sizeof(struct acpi_table_einj)) /
|
||
|
|
sizeof(struct acpi_einj_entry))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init einj_init(void)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
acpi_status status;
|
||
|
|
struct dentry *fentry;
|
||
|
|
struct apei_exec_context ctx;
|
||
|
|
|
||
|
|
if (acpi_disabled)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
status = acpi_get_table(ACPI_SIG_EINJ, 0,
|
||
|
|
(struct acpi_table_header **)&einj_tab);
|
||
|
|
if (status == AE_NOT_FOUND) {
|
||
|
|
pr_info(EINJ_PFX "Table is not found!\n");
|
||
|
|
return -ENODEV;
|
||
|
|
} else if (ACPI_FAILURE(status)) {
|
||
|
|
const char *msg = acpi_format_exception(status);
|
||
|
|
pr_err(EINJ_PFX "Failed to get table, %s\n", msg);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
rc = einj_check_table(einj_tab);
|
||
|
|
if (rc) {
|
||
|
|
pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
rc = -ENOMEM;
|
||
|
|
einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
|
||
|
|
if (!einj_debug_dir)
|
||
|
|
goto err_cleanup;
|
||
|
|
fentry = debugfs_create_file("available_error_type", S_IRUSR,
|
||
|
|
einj_debug_dir, NULL,
|
||
|
|
&available_error_type_fops);
|
||
|
|
if (!fentry)
|
||
|
|
goto err_cleanup;
|
||
|
|
fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR,
|
||
|
|
einj_debug_dir, NULL, &error_type_fops);
|
||
|
|
if (!fentry)
|
||
|
|
goto err_cleanup;
|
||
|
|
fentry = debugfs_create_file("error_inject", S_IWUSR,
|
||
|
|
einj_debug_dir, NULL, &error_inject_fops);
|
||
|
|
if (!fentry)
|
||
|
|
goto err_cleanup;
|
||
|
|
|
||
|
|
apei_resources_init(&einj_resources);
|
||
|
|
einj_exec_ctx_init(&ctx);
|
||
|
|
rc = apei_exec_collect_resources(&ctx, &einj_resources);
|
||
|
|
if (rc)
|
||
|
|
goto err_fini;
|
||
|
|
rc = apei_resources_request(&einj_resources, "APEI EINJ");
|
||
|
|
if (rc)
|
||
|
|
goto err_fini;
|
||
|
|
rc = apei_exec_pre_map_gars(&ctx);
|
||
|
|
if (rc)
|
||
|
|
goto err_release;
|
||
|
|
|
||
|
|
pr_info(EINJ_PFX "Error INJection is initialized.\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_release:
|
||
|
|
apei_resources_release(&einj_resources);
|
||
|
|
err_fini:
|
||
|
|
apei_resources_fini(&einj_resources);
|
||
|
|
err_cleanup:
|
||
|
|
debugfs_remove_recursive(einj_debug_dir);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit einj_exit(void)
|
||
|
|
{
|
||
|
|
struct apei_exec_context ctx;
|
||
|
|
|
||
|
|
einj_exec_ctx_init(&ctx);
|
||
|
|
apei_exec_post_unmap_gars(&ctx);
|
||
|
|
apei_resources_release(&einj_resources);
|
||
|
|
apei_resources_fini(&einj_resources);
|
||
|
|
debugfs_remove_recursive(einj_debug_dir);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(einj_init);
|
||
|
|
module_exit(einj_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Huang Ying");
|
||
|
|
MODULE_DESCRIPTION("APEI Error INJection support");
|
||
|
|
MODULE_LICENSE("GPL");
|