mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 21:42:20 +07:00
b4e008dc53
Current fix for resource conflict is to remove the address region <param1 & param2, ~param2+1> from trigger resource, which is highly relies on valid user input. This patch is trying to avoid such potential issues by fetching the exact address region from trigger action table entry. Signed-off-by: Xiao, Hui <hui.xiao@linux.intel.com> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
614 lines
16 KiB
C
614 lines
16 KiB
C
/*
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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 2009-2010 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/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 milliseconds */
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#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
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/*
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* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
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* EINJ table through an unpublished extension. Use with caution as
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* most will ignore the parameter and make their own choice of address
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* for error injection. This extension is used only if
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* param_extension module parameter is specified.
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*/
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struct einj_parameter {
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u64 type;
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u64 reserved1;
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u64 reserved2;
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u64 param1;
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u64 param2;
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};
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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 bool param_extension;
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module_param(param_extension, bool, 0);
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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 struct einj_parameter *einj_param;
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#ifndef writeq
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static inline void writeq(__u64 val, volatile void __iomem *addr)
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{
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writel(val, addr);
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writel(val >> 32, addr+4);
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}
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#endif
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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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static u64 einj_get_parameter_address(void)
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{
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int i;
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u64 paddr = 0;
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struct acpi_whea_header *entry;
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entry = EINJ_TAB_ENTRY(einj_tab);
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for (i = 0; i < einj_tab->entries; i++) {
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if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
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entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
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entry->register_region.space_id ==
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ACPI_ADR_SPACE_SYSTEM_MEMORY)
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memcpy(&paddr, &entry->register_region.address,
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sizeof(paddr));
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entry++;
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}
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return paddr;
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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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static struct acpi_generic_address *einj_get_trigger_parameter_region(
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struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2)
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{
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int i;
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struct acpi_whea_header *entry;
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entry = (struct acpi_whea_header *)
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((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
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for (i = 0; i < trigger_tab->entry_count; i++) {
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if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
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entry->instruction == ACPI_EINJ_WRITE_REGISTER_VALUE &&
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entry->register_region.space_id ==
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ACPI_ADR_SPACE_SYSTEM_MEMORY &&
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(entry->register_region.address & param2) == (param1 & param2))
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return &entry->register_region;
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entry++;
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}
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return NULL;
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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, u32 type,
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u64 param1, u64 param2)
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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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struct acpi_generic_address *trigger_param_region = NULL;
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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 [mem %#010llx-%#010llx] for Trigger table\n",
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(unsigned long long)trigger_paddr,
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(unsigned long long)trigger_paddr +
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sizeof(*trigger_tab) - 1);
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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 [mem %#010llx-%#010llx] 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 - 1);
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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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/*
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* Some firmware will access target address specified in
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* param1 to trigger the error when injecting memory error.
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* This will cause resource conflict with regular memory. So
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* remove it from trigger table resources.
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*/
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if (param_extension && (type & 0x0038) && param2) {
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struct apei_resources addr_resources;
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apei_resources_init(&addr_resources);
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trigger_param_region = einj_get_trigger_parameter_region(
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trigger_tab, param1, param2);
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if (trigger_param_region) {
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rc = apei_resources_add(&addr_resources,
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trigger_param_region->address,
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trigger_param_region->bit_width/8, true);
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if (rc)
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goto out_fini;
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rc = apei_resources_sub(&trigger_resources,
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&addr_resources);
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}
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apei_resources_fini(&addr_resources);
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if (rc)
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goto out_fini;
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}
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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, u64 param1, u64 param2)
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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_optional(&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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if (einj_param) {
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writeq(param1, &einj_param->param1);
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writeq(param2, &einj_param->param2);
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}
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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, type, param1, param2);
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if (rc)
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return rc;
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rc = apei_exec_run_optional(&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, u64 param1, u64 param2)
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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, param1, param2);
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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 u64 error_param1;
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static u64 error_param2;
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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);
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if (rc)
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return rc;
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if (!(val & available_error_type))
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return -EINVAL;
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error_type = val;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
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error_type_set, "0x%llx\n");
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static int error_inject_set(void *data, u64 val)
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{
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if (!error_type)
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return -EINVAL;
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return einj_error_inject(error_type, error_param1, error_param2);
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}
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DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
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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) - sizeof(einj_tab->header)))
|
|
&& (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;
|
|
u64 param_paddr;
|
|
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)
|
|
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;
|
|
if (param_extension) {
|
|
param_paddr = einj_get_parameter_address();
|
|
if (param_paddr) {
|
|
einj_param = ioremap(param_paddr, sizeof(*einj_param));
|
|
rc = -ENOMEM;
|
|
if (!einj_param)
|
|
goto err_unmap;
|
|
fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
|
|
einj_debug_dir, &error_param1);
|
|
if (!fentry)
|
|
goto err_unmap;
|
|
fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
|
|
einj_debug_dir, &error_param2);
|
|
if (!fentry)
|
|
goto err_unmap;
|
|
} else
|
|
pr_warn(EINJ_PFX "Parameter extension is not supported.\n");
|
|
}
|
|
|
|
pr_info(EINJ_PFX "Error INJection is initialized.\n");
|
|
|
|
return 0;
|
|
|
|
err_unmap:
|
|
if (einj_param)
|
|
iounmap(einj_param);
|
|
apei_exec_post_unmap_gars(&ctx);
|
|
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;
|
|
|
|
if (einj_param)
|
|
iounmap(einj_param);
|
|
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");
|