int __init erst_init(void)
{
int rc = 0;
acpi_status status;
struct apei_exec_context ctx;
if (acpi_disabled)
return -ENODEV;
status = acpi_get_table(ACPI_SIG_ERST, 0,
(struct acpi_table_header **)&erst_tab);
if (status == AE_NOT_FOUND) {
printk(KERN_INFO "ERST table was not found\n");
return -ENODEV;
} else if (ACPI_FAILURE(status)) {
const char *msg = acpi_format_exception(status);
printk(KERN_WARNING "Failed to get ERST table: %s\n", msg);
return -EINVAL;
}
rc = erst_check_table(erst_tab);
if (rc) {
printk(KERN_ERR "ERST table is invalid\n");
return rc;
}
erst_exec_ctx_init(&ctx);
rc = apei_exec_pre_map_gars(&ctx);
if (rc)
return rc;
rc = erst_get_erange(&erst_erange);
if (rc) {
if (rc == -ENODEV)
printk(KERN_INFO
"The corresponding hardware device or firmware "
"implementation is not available.\n");
else
printk(KERN_ERR
"Failed to get Error Log Address Range.\n");
goto err_unmap_reg;
}
erst_erange.vaddr = apei_pre_map(erst_erange.base, erst_erange.size);
if (!erst_erange.vaddr) {
rc = -ENOMEM;
goto err_unmap_reg;
}
printk(KERN_INFO "Xen ERST support is initialized.\n");
erst_enabled = 1;
return 0;
err_unmap_reg:
apei_exec_post_unmap_gars(&ctx);
return rc;
}
static ssize_t __erst_get_record_count(void)
{
struct apei_exec_context ctx;
int rc;
erst_exec_ctx_init(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_COUNT);
if (rc)
return rc;
return apei_exec_ctx_get_output(&ctx);
}
static int __erst_get_next_record_id(u64 *record_id)
{
struct apei_exec_context ctx;
int rc;
erst_exec_ctx_init(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_ID);
if (rc)
return rc;
*record_id = apei_exec_ctx_get_output(&ctx);
return 0;
}
static int __erst_read_from_storage(u64 record_id, u64 offset)
{
struct apei_exec_context ctx;
u64 timeout = FIRMWARE_TIMEOUT;
u64 val;
int rc;
erst_exec_ctx_init(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_READ);
if (rc)
return rc;
apei_exec_ctx_set_input(&ctx, offset);
rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET);
if (rc)
return rc;
apei_exec_ctx_set_input(&ctx, record_id);
rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID);
if (rc)
return rc;
rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION);
if (rc)
return rc;
for (;;) {
rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS);
if (rc)
return rc;
val = apei_exec_ctx_get_output(&ctx);
if (!val)
break;
if (erst_timedout(&timeout, SPIN_UNIT))
return -EIO;
};
rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS);
if (rc)
return rc;
val = apei_exec_ctx_get_output(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_END);
if (rc)
return rc;
return erst_errno(val);
}
static int erst_get_erange(struct erst_erange *range)
{
struct apei_exec_context ctx;
int rc;
erst_exec_ctx_init(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_RANGE);
if (rc)
return rc;
range->base = apei_exec_ctx_get_output(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_LENGTH);
if (rc)
return rc;
range->size = apei_exec_ctx_get_output(&ctx);
rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_ATTRIBUTES);
if (rc)
return rc;
range->attr = apei_exec_ctx_get_output(&ctx);
return 0;
}
static int __init erst_init(void)
{
int rc = 0;
acpi_status status;
struct apei_exec_context ctx;
struct apei_resources erst_resources;
struct resource *r;
if (acpi_disabled)
goto err;
if (erst_disable) {
pr_info(ERST_PFX
"Error Record Serialization Table (ERST) support is disabled.\n");
goto err;
}
status = acpi_get_table(ACPI_SIG_ERST, 0,
(struct acpi_table_header **)&erst_tab);
if (status == AE_NOT_FOUND) {
pr_info(ERST_PFX "Table is not found!\n");
goto err;
} else if (ACPI_FAILURE(status)) {
const char *msg = acpi_format_exception(status);
pr_err(ERST_PFX "Failed to get table, %s\n", msg);
rc = -EINVAL;
goto err;
}
rc = erst_check_table(erst_tab);
if (rc) {
pr_err(FW_BUG ERST_PFX "ERST table is invalid\n");
goto err;
}
apei_resources_init(&erst_resources);
erst_exec_ctx_init(&ctx);
rc = apei_exec_collect_resources(&ctx, &erst_resources);
if (rc)
goto err_fini;
rc = apei_resources_request(&erst_resources, "APEI ERST");
if (rc)
goto err_fini;
rc = apei_exec_pre_map_gars(&ctx);
if (rc)
goto err_release;
rc = erst_get_erange(&erst_erange);
if (rc) {
if (rc == -ENODEV)
pr_info(ERST_PFX
"The corresponding hardware device or firmware implementation "
"is not available.\n");
else
pr_err(ERST_PFX
"Failed to get Error Log Address Range.\n");
goto err_unmap_reg;
}
r = request_mem_region(erst_erange.base, erst_erange.size, "APEI ERST");
if (!r) {
pr_err(ERST_PFX
"Can not request iomem region <0x%16llx-0x%16llx> for ERST.\n",
(unsigned long long)erst_erange.base,
(unsigned long long)erst_erange.base + erst_erange.size);
rc = -EIO;
goto err_unmap_reg;
}
rc = -ENOMEM;
erst_erange.vaddr = ioremap_cache(erst_erange.base,
erst_erange.size);
if (!erst_erange.vaddr)
goto err_release_erange;
pr_info(ERST_PFX
"Error Record Serialization Table (ERST) support is initialized.\n");
return 0;
err_release_erange:
release_mem_region(erst_erange.base, erst_erange.size);
err_unmap_reg:
apei_exec_post_unmap_gars(&ctx);
err_release:
apei_resources_release(&erst_resources);
err_fini:
apei_resources_fini(&erst_resources);
err:
erst_disable = 1;
return rc;
}