// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 <[email protected]>
*/
#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 <linux/platform_device.h>
#include <linux/unaligned.h>
#include "apei-internal.h"
#undef pr_fmt
#define pr_fmt(fmt) "EINJ: " fmt
#define SLEEP_UNIT_MIN 1000 /* 1ms */
#define SLEEP_UNIT_MAX 5000 /* 5ms */
/* Firmware should respond within 1 seconds */
#define FIRMWARE_TIMEOUT (1 * USEC_PER_SEC)
#define ACPI5_VENDOR_BIT BIT(31)
#define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
ACPI_EINJ_MEMORY_UNCORRECTABLE | \
ACPI_EINJ_MEMORY_FATAL)
#define CXL_ERROR_MASK (ACPI_EINJ_CXL_CACHE_CORRECTABLE | \
ACPI_EINJ_CXL_CACHE_UNCORRECTABLE | \
ACPI_EINJ_CXL_CACHE_FATAL | \
ACPI_EINJ_CXL_MEM_CORRECTABLE | \
ACPI_EINJ_CXL_MEM_UNCORRECTABLE | \
ACPI_EINJ_CXL_MEM_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 struct debugfs_blob_wrapper vendor_errors;
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* EINJ table through an unpublished extension.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);
/*
* Exported APIs use this flag to exit early if einj_probe() failed.
*/
bool einj_initialized __ro_after_init;
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 */
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 < SLEEP_UNIT_MIN) {
pr_warn(FW_WARN "Firmware does not respond in time\n");
return 1;
}
*t -= SLEEP_UNIT_MIN;
usleep_range(SLEEP_UNIT_MIN, SLEEP_UNIT_MAX);
return 0;
}
static void get_oem_vendor_struct(u64 paddr, int offset,
struct vendor_error_type_extension *v)
{
unsigned long vendor_size;
u64 target_pa = paddr + offset + sizeof(struct vendor_error_type_extension);
vendor_size = v->length - sizeof(struct vendor_error_type_extension);
if (vendor_size)
vendor_errors.data = acpi_os_map_memory(target_pa, vendor_size);
if (vendor_errors.data)
vendor_errors.size = vendor_size;
}
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;
get_oem_vendor_struct(paddr, offset, v);
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 &&
entry->register_region.space_id ==
ACPI_ADR_SPACE_SYSTEM_MEMORY)
pa_v5 = get_unaligned(&entry->register_region.address);
entry++;
}
if (pa_v5) {
struct set_error_type_with_address *v5param;
v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param));
if (v5param) {
acpi5 = 1;
check_vendor_extension(pa_v5, v5param);
return v5param;
}
}
if (param_extension && pa_v4) {
struct einj_parameter *v4param;
v4param = acpi_os_map_iomem(pa_v4, sizeof(*v4param));
if (!v4param)
return NULL;
if (v4param->reserved1 || v4param->reserved2) {
acpi_os_unmap_iomem(v4param, sizeof(*v4param));
return NULL;
}
return v4param;
}
return NULL;
}
/* do sanity check to trigger table */
static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
{
if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
return -EINVAL;
if (trigger_tab->table_size > PAGE_SIZE ||
trigger_tab->table_size < trigger_tab->header_size)
return -EINVAL;
if (trigger_tab->entry_count !=
(trigger_tab->table_size - trigger_tab->header_size) /
sizeof(struct acpi_einj_entry))
return -EINVAL;
return 0;
}
static struct acpi_generic_address *einj_get_trigger_parameter_region(
struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2)
{
int i;
struct acpi_whea_header *entry;
entry = (struct acpi_whea_header *)
((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
for (i = 0; i < trigger_tab->entry_count; i++) {
if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
entry->instruction <= ACPI_EINJ_WRITE_REGISTER_VALUE &&
entry->register_region.space_id ==
ACPI_ADR_SPACE_SYSTEM_MEMORY &&
(entry->register_region.address & param2) == (param1 & param2))
return &entry->register_region;
entry++;
}
return NULL;
}
/* Execute instructions in trigger error action table */
static int __einj_error_trigger(u64 trigger_paddr, u32 type,
u64 param1, u64 param2)
{
struct acpi_einj_trigger *trigger_tab = NULL;
struct apei_exec_context trigger_ctx;
struct apei_resources trigger_resources;
struct acpi_whea_header *trigger_entry;
struct resource *r;
u32 table_size;
int rc = -EIO;
struct acpi_generic_address *trigger_param_region = NULL;
r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
"APEI EINJ Trigger Table");
if (!r) {
pr_err("Can not request [mem %#010llx-%#010llx] for Trigger table\n",
(unsigned long long)trigger_paddr,
(unsigned long long)trigger_paddr +
sizeof(*trigger_tab) - 1);
goto out;
}
trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
if (!trigger_tab) {
pr_err("Failed to map trigger table!\n");
goto out_rel_header;
}
rc = einj_check_trigger_header(trigger_tab);
if (rc) {
pr_warn(FW_BUG "Invalid trigger error action table.\n");
goto out_rel_header;
}
/* No action structures in the TRIGGER_ERROR table, nothing to do */
if (!trigger_tab->entry_count)
goto out_rel_header;
rc = -EIO;
table_size = trigger_tab->table_size;
r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
table_size - sizeof(*trigger_tab),
"APEI EINJ Trigger Table");
if (!r) {
pr_err("Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n",
(unsigned long long)trigger_paddr + sizeof(*trigger_tab),
(unsigned long long)trigger_paddr + table_size - 1);
goto out_rel_header;
}
iounmap(trigger_tab);
trigger_tab = ioremap_cache(trigger_paddr, table_size);
if (!trigger_tab) {
pr_err("Failed to map trigger table!\n");
goto out_rel_entry;
}
trigger_entry = (struct acpi_whea_header *)
((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
apei_resources_init(&trigger_resources);
apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
ARRAY_SIZE(einj_ins_type),
trigger_entry, trigger_tab->entry_count);
rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
if (rc)
goto out_fini;
rc = apei_resources_sub(&trigger_resources, &einj_resources);
if (rc)
goto out_fini;
/*
* Some firmware will access target address specified in
* param1 to trigger the error when injecting memory error.
* This will cause resource conflict with regular memory. So
* remove it from trigger table resources.
*/
if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) {
struct apei_resources addr_resources;
apei_resources_init(&addr_resources);
trigger_param_region = einj_get_trigger_parameter_region(
trigger_tab, param1, param2);
if (trigger_param_region) {
rc = apei_resources_add(&addr_resources,
trigger_param_region->address,
trigger_param_region->bit_width/8, true);
if (rc)
goto out_fini;
rc = apei_resources_sub(&trigger_resources,
&addr_resources);
}
apei_resources_fini(&addr_resources);
if (rc)
goto out_fini;
}
rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
if (rc)
goto out_fini;
rc = apei_exec_pre_map_gars(&trigger_ctx);
if (rc)
goto out_release;
rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
apei_exec_post_unmap_gars(&trigger_ctx);
out_release:
apei_resources_release(&trigger_resources);
out_fini:
apei_resources_fini(&trigger_resources);
out_rel_entry:
release_mem_region(trigger_paddr + sizeof(*trigger_tab),
table_size - sizeof(*trigger_tab));
out_rel_header:
release_mem_region(trigger_paddr, sizeof(*trigger_tab));
out:
if (trigger_tab)
iounmap(trigger_tab);
return rc;
}
static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
u64 param3, u64 param4)
{
struct apei_exec_context ctx;
u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
int rc;
einj_exec_ctx_init(&ctx);
rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
if (rc)
return rc;
apei_exec_ctx_set_input(&ctx, type);
if (acpi5) {
struct set_error_type_with_address *v5param = einj_param;
v5param->type = type;
if (type & ACPI5_VENDOR_BIT) {
switch (vendor_flags) {
case SETWA_FLAGS_APICID:
v5param->apicid = param1;
break;
case SETWA_FLAGS_MEM:
v5param->memory_address = param1;
v5param->memory_address_range = param2;
break;
case SETWA_FLAGS_PCIE_SBDF:
v5param->pcie_sbdf = param1;
break;
}
v5param->flags = vendor_flags;
} else if (flags) {
v5param->flags = flags;
v5param->memory_address = param1;
v5param->memory_address_range = param2;
v5param->apicid = param3;
v5param->pcie_sbdf = param4;
} else {
switch (type) {
case ACPI_EINJ_PROCESSOR_CORRECTABLE:
case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
case ACPI_EINJ_PROCESSOR_FATAL:
v5param->apicid = param1;
v5param->flags = SETWA_FLAGS_APICID;
break;
case ACPI_EINJ_MEMORY_CORRECTABLE:
case ACPI_EINJ_MEMORY_UNCORRECTABLE:
case ACPI_EINJ_MEMORY_FATAL:
v5param->memory_address = param1;
v5param->memory_address_range = param2;
v5param->flags = SETWA_FLAGS_MEM;
break;
case ACPI_EINJ_PCIX_CORRECTABLE:
case ACPI_EINJ_PCIX_UNCORRECTABLE:
case ACPI_EINJ_PCIX_FATAL:
v5param->pcie_sbdf = param1;
v5param->flags = SETWA_FLAGS_PCIE_SBDF;
break;
}
}
} else {
rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
if (rc)
return rc;
if (einj_param) {
struct einj_parameter *v4param = einj_param;
v4param->param1 = param1;
v4param->param2 = param2;
}
}
rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
if (rc)
return rc;
for (;;) {
rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
if (rc)
return rc;
val = apei_exec_ctx_get_output(&ctx);
if (!(val & EINJ_OP_BUSY))
break;
if (einj_timedout(&timeout))
return -EIO;
}
rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
if (rc)
return rc;
val = apei_exec_ctx_get_output(&ctx);
if (val == EINJ_STATUS_FAIL)
return -EBUSY;
else if (val == EINJ_STATUS_INVAL)
return -EINVAL;
/*
* The error is injected into the platform successfully, then it needs
* to trigger the error.
*/
rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
if (rc)
return rc;
trigger_paddr = apei_exec_ctx_get_output(&ctx);
if (notrigger == 0) {
rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
if (rc)
return rc;
}
rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
return rc;
}
/* Inject the specified hardware error */
int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, u64 param3,
u64 param4)
{
int rc;
u64 base_addr, size;
/* If user manually set "flags", make sure it is legal */
if (flags && (flags &
~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF)))
return -EINVAL;
/*
* We need extra sanity checks for memory errors.
* Other types leap directly to injection.
*/
/* ensure param1/param2 existed */
if (!(param_extension || acpi5))
goto inject;
/* ensure injection is memory related */
if (type & ACPI5_VENDOR_BIT) {
if (vendor_flags != SETWA_FLAGS_MEM)
goto inject;
} else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) {
goto inject;
}
/*
* Injections targeting a CXL 1.0/1.1 port have to be injected
* via the einj_cxl_rch_error_inject() path as that does the proper
* validation of the given RCRB base (MMIO) address.
*/
if (einj_is_cxl_error_type(type) && (flags & SETWA_FLAGS_MEM))
return -EINVAL;
/*
* Disallow crazy address masks that give BIOS leeway to pick
* injection address almost anywhere. Insist on page or
* better granularity and that target address is normal RAM or
* NVDIMM.
*/
base_addr = param1 & param2;
size = ~param2 + 1;
if (((param2 & PAGE_MASK) != PAGE_MASK) ||
((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE)
!= REGION_INTERSECTS) &&
(region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY)
!= REGION_INTERSECTS) &&
(region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_SOFT_RESERVED)
!= REGION_INTERSECTS) &&
!arch_is_platform_page(base_addr)))
return -EINVAL;
if (is_zero_pfn(base_addr >> PAGE_SHIFT))
return -EADDRINUSE;
inject:
mutex_lock(&einj_mutex);
rc = __einj_error_inject(type, flags, param1, param2, param3, param4);
mutex_unlock(&einj_mutex);
return rc;
}
int einj_cxl_rch_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
u64 param3, u64 param4)
{
int rc;
if (!(einj_is_cxl_error_type(type) && (flags & SETWA_FLAGS_MEM)))
return -EINVAL;
mutex_lock(&einj_mutex);
rc = __einj_error_inject(type, flags, param1, param2, param3, param4);
mutex_unlock(&einj_mutex);
return rc;
}
static u32 error_type;
static u32 error_flags;
static u64 error_param1;
static u64 error_param2;
static u64 error_param3;
static u64 error_param4;
static struct dentry *einj_debug_dir;
static struct { u32 mask; const char *str; } const einj_error_type_string[] = {
{ BIT(0), "Processor Correctable" },
{ BIT(1), "Processor Uncorrectable non-fatal" },
{ BIT(2), "Processor Uncorrectable fatal" },
{ BIT(3), "Memory Correctable" },
{ BIT(4), "Memory Uncorrectable non-fatal" },
{ BIT(5), "Memory Uncorrectable fatal" },
{ BIT(6), "PCI Express Correctable" },
{ BIT(7), "PCI Express Uncorrectable non-fatal" },
{ BIT(8), "PCI Express Uncorrectable fatal" },
{ BIT(9), "Platform Correctable" },
{ BIT(10), "Platform Uncorrectable non-fatal" },
{ BIT(11), "Platform Uncorrectable fatal"},
{ BIT(31), "Vendor Defined Error Types" },
};
static int available_error_type_show(struct seq_file *m, void *v)
{
int rc;
u32 error_type = 0;
rc = einj_get_available_error_type(&error_type);
if (rc)
return rc;
for (int pos = 0; pos < ARRAY_SIZE(einj_error_type_string); pos++)
if (error_type & einj_error_type_string[pos].mask)
seq_printf(m, "0x%08x\t%s\n", einj_error_type_string[pos].mask,
einj_error_type_string[pos].str);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(available_error_type);
static int error_type_get(void *data, u64 *val)
{
*val = error_type;
return 0;
}
bool einj_is_cxl_error_type(u64 type)
{
return (type & CXL_ERROR_MASK) && (!(type & ACPI5_VENDOR_BIT));
}
int einj_validate_error_type(u64 type)
{
u32 tval, vendor, available_error_type = 0;
int rc;
/* Only low 32 bits for error type are valid */
if (type & GENMASK_ULL(63, 32))
return -EINVAL;
/*
* Vendor defined types have 0x80000000 bit set, and
* are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
*/
vendor = type & ACPI5_VENDOR_BIT;
tval = type & GENMASK(30, 0);
/* Only one error type can be specified */
if (tval & (tval - 1))
return -EINVAL;
if (!vendor) {
rc = einj_get_available_error_type(&available_error_type);
if (rc)
return rc;
if (!(type & available_error_type))
return -EINVAL;
}
return 0;
}
static int error_type_set(void *data, u64 val)
{
int rc;
rc = einj_validate_error_type(val);
if (rc)
return rc;
error_type = val;
return 0;
}
DEFINE_DEBUGFS_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, error_flags, error_param1, error_param2,
error_param3, error_param4);
}
DEFINE_DEBUGFS_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) - 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_probe(struct platform_device *pdev)
{
int rc;
acpi_status status;
struct apei_exec_context ctx;
if (acpi_disabled) {
pr_debug("ACPI disabled.\n");
return -ENODEV;
}
status = acpi_get_table(ACPI_SIG_EINJ, 0,
(struct acpi_table_header **)&einj_tab);
if (status == AE_NOT_FOUND) {
pr_debug("EINJ table not found.\n");
return -ENODEV;
} else if (ACPI_FAILURE(status)) {
pr_err("Failed to get EINJ table: %s\n",
acpi_format_exception(status));
return -EINVAL;
}
rc = einj_check_table(einj_tab);
if (rc) {
pr_warn(FW_BUG "Invalid EINJ table.\n");
goto err_put_table;
}
rc = -ENOMEM;
einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir,
NULL, &available_error_type_fops);
debugfs_create_file_unsafe("error_type", 0600, einj_debug_dir,
NULL, &error_type_fops);
debugfs_create_file_unsafe("error_inject", 0200, einj_debug_dir,
NULL, &error_inject_fops);
apei_resources_init(&einj_resources);
einj_exec_ctx_init(&ctx);
rc = apei_exec_collect_resources(&ctx, &einj_resources);
if (rc) {
pr_err("Error collecting EINJ resources.\n");
goto err_fini;
}
rc = apei_resources_request(&einj_resources, "APEI EINJ");
if (rc) {
pr_err("Error requesting memory/port resources.\n");
goto err_fini;
}
rc = apei_exec_pre_map_gars(&ctx);
if (rc) {
pr_err("Error pre-mapping GARs.\n");
goto err_release;
}
einj_param = einj_get_parameter_address();
if ((param_extension || acpi5) && einj_param) {
debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
&error_flags);
debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
&error_param1);
debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
&error_param2);
debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
&error_param3);
debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
&error_param4);
debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
einj_debug_dir, ¬rigger);
}
if (vendor_dev[0]) {
vendor_blob.data = vendor_dev;
vendor_blob.size = strlen(vendor_dev);
debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
&vendor_blob);
debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
einj_debug_dir, &vendor_flags);
}
if (vendor_errors.size)
debugfs_create_blob("oem_error", 0600, einj_debug_dir,
&vendor_errors);
pr_info("Error INJection is initialized.\n");
return 0;
err_release:
apei_resources_release(&einj_resources);
err_fini:
apei_resources_fini(&einj_resources);
debugfs_remove_recursive(einj_debug_dir);
err_put_table:
acpi_put_table((struct acpi_table_header *)einj_tab);
return rc;
}
static void __exit einj_remove(struct platform_device *pdev)
{
struct apei_exec_context ctx;
if (einj_param) {
acpi_size size = (acpi5) ?
sizeof(struct set_error_type_with_address) :
sizeof(struct einj_parameter);
acpi_os_unmap_iomem(einj_param, size);
if (vendor_errors.size)
acpi_os_unmap_memory(vendor_errors.data, vendor_errors.size);
}
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);
acpi_put_table((struct acpi_table_header *)einj_tab);
}
static struct platform_device *einj_dev;
/*
* einj_remove() lives in .exit.text. For drivers registered via
* platform_driver_probe() this is ok because they cannot get unbound at
* runtime. So mark the driver struct with __refdata to prevent modpost
* triggering a section mismatch warning.
*/
static struct platform_driver einj_driver __refdata = {
.remove_new = __exit_p(einj_remove),
.driver = {
.name = "acpi-einj",
},
};
static int __init einj_init(void)
{
struct platform_device_info einj_dev_info = {
.name = "acpi-einj",
.id = -1,
};
int rc;
einj_dev = platform_device_register_full(&einj_dev_info);
if (IS_ERR(einj_dev))
return PTR_ERR(einj_dev);
rc = platform_driver_probe(&einj_driver, einj_probe);
einj_initialized = rc == 0;
return 0;
}
static void __exit einj_exit(void)
{
if (einj_initialized)
platform_driver_unregister(&einj_driver);
platform_device_unregister(einj_dev);
}
module_init(einj_init);
module_exit(einj_exit);
MODULE_AUTHOR("Huang Ying");
MODULE_DESCRIPTION("APEI Error INJection support");
MODULE_LICENSE("GPL");
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