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/*
* APEI Error INJection support
*
* EINJ provides a hardware error injection mechanism, this is useful
* for debugging and testing of other APEI and RAS features.
*
* For more information about EINJ, please refer to ACPI Specification
* version 4.0, section 17.5.
*
* Copyright 2009-2010 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/nmi.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <asm/unaligned.h>
#include "apei-internal.h"
#define EINJ_PFX "EINJ: "
#define SPIN_UNIT 100 /* 100ns */
/* Firmware should respond within 1 milliseconds */
#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
#define ACPI5_VENDOR_BIT BIT(31)
#define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
ACPI_EINJ_MEMORY_UNCORRECTABLE | \
ACPI_EINJ_MEMORY_FATAL)
/*
* ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
*/
static int acpi5;
struct set_error_type_with_address {
u32 type;
u32 vendor_extension;
u32 flags;
u32 apicid;
u64 memory_address;
u64 memory_address_range;
u32 pcie_sbdf;
};
enum {
SETWA_FLAGS_APICID = 1,
SETWA_FLAGS_MEM = 2,
SETWA_FLAGS_PCIE_SBDF = 4,
};
/*
* Vendor extensions for platform specific operations
*/
struct vendor_error_type_extension {
u32 length;
u32 pcie_sbdf;
u16 vendor_id;
u16 device_id;
u8 rev_id;
u8 reserved[3];
};
static u32 notrigger;
static u32 vendor_flags;
static struct debugfs_blob_wrapper vendor_blob;
static char vendor_dev[64];
/*
* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
* EINJ table through an unpublished extension. Use with caution as
* most will ignore the parameter and make their own choice of address
* for error injection. This extension is used only if
* param_extension module parameter is specified.
*/
struct einj_parameter {
u64 type;
u64 reserved1;
u64 reserved2;
u64 param1;
u64 param2;
};
#define EINJ_OP_BUSY 0x1
#define EINJ_STATUS_SUCCESS 0x0
#define EINJ_STATUS_FAIL 0x1
#define EINJ_STATUS_INVAL 0x2
#define EINJ_TAB_ENTRY(tab) \
((struct acpi_whea_header *)((char *)(tab) + \
sizeof(struct acpi_table_einj)))
static bool param_extension;
module_param(param_extension, bool, 0);
static struct acpi_table_einj *einj_tab;
static struct apei_resources einj_resources;
static struct apei_exec_ins_type einj_ins_type[] = {
[ACPI_EINJ_READ_REGISTER] = {
.flags = APEI_EXEC_INS_ACCESS_REGISTER,
.run = apei_exec_read_register,
},
[ACPI_EINJ_READ_REGISTER_VALUE] = {
.flags = APEI_EXEC_INS_ACCESS_REGISTER,
.run = apei_exec_read_register_value,
},
[ACPI_EINJ_WRITE_REGISTER] = {
.flags = APEI_EXEC_INS_ACCESS_REGISTER,
.run = apei_exec_write_register,
},
[ACPI_EINJ_WRITE_REGISTER_VALUE] = {
.flags = APEI_EXEC_INS_ACCESS_REGISTER,
.run = apei_exec_write_register_value,
},
[ACPI_EINJ_NOOP] = {
.flags = 0,
.run = apei_exec_noop,
},
};
/*
* Prevent EINJ interpreter to run simultaneously, because the
* corresponding firmware implementation may not work properly when
* invoked simultaneously.
*/
static DEFINE_MUTEX(einj_mutex);
static void *einj_param;
static void einj_exec_ctx_init(struct apei_exec_context *ctx)
{
apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
}
static int __einj_get_available_error_type(u32 *type)
{
struct apei_exec_context ctx;
int rc;
einj_exec_ctx_init(&ctx);
rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
if (rc)
return rc;
*type = apei_exec_ctx_get_output(&ctx);
return 0;
}
/* Get error injection capabilities of the platform */
static int einj_get_available_error_type(u32 *type)
{
int rc;
mutex_lock(&einj_mutex);
rc = __einj_get_available_error_type(type);
mutex_unlock(&einj_mutex);
return rc;
}
static int einj_timedout(u64 *t)
{
if ((s64)*t < SPIN_UNIT) {
pr_warning(FW_WARN EINJ_PFX
"Firmware does not respond in time\n");
return 1;
}
*t -= SPIN_UNIT;
ndelay(SPIN_UNIT);
touch_nmi_watchdog();
return 0;
}
static void check_vendor_extension(u64 paddr,
struct set_error_type_with_address *v5param)
{
int offset = v5param->vendor_extension;
struct vendor_error_type_extension *v;
u32 sbdf;
if (!offset)
return;
v = acpi_os_map_iomem(paddr + offset, sizeof(*v));
if (!v)
return;
sbdf = v->pcie_sbdf;
sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
sbdf >> 24, (sbdf >> 16) & 0xff,
(sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
v->vendor_id, v->device_id, v->rev_id);
acpi_os_unmap_iomem(v, sizeof(*v));
}
static void *einj_get_parameter_address(void)
{
int i;
u64 pa_v4 = 0, pa_v5 = 0;
struct acpi_whea_header *entry;
entry = EINJ_TAB_ENTRY(einj_tab);
for (i = 0; i < einj_tab->entries; i++) {
if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
entry->register_region.space_id ==
ACPI_ADR_SPACE_SYSTEM_MEMORY)
pa_v4 = get_unaligned(&entry->register_region.address);
if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
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