|
|
@@ -0,0 +1,150 @@
|
|
|
+/*
|
|
|
+ * APEI Boot Error Record Table (BERT) support
|
|
|
+ *
|
|
|
+ * Copyright 2011 Intel Corp.
|
|
|
+ * Author: Huang Ying <ying.huang@intel.com>
|
|
|
+ *
|
|
|
+ * Under normal circumstances, when a hardware error occurs, the error
|
|
|
+ * handler receives control and processes the error. This gives OSPM a
|
|
|
+ * chance to process the error condition, report it, and optionally attempt
|
|
|
+ * recovery. In some cases, the system is unable to process an error.
|
|
|
+ * For example, system firmware or a management controller may choose to
|
|
|
+ * reset the system or the system might experience an uncontrolled crash
|
|
|
+ * or reset.The boot error source is used to report unhandled errors that
|
|
|
+ * occurred in a previous boot. This mechanism is described in the BERT
|
|
|
+ * table.
|
|
|
+ *
|
|
|
+ * For more information about BERT, please refer to ACPI Specification
|
|
|
+ * version 4.0, section 17.3.1
|
|
|
+ *
|
|
|
+ * This file is licensed under GPLv2.
|
|
|
+ *
|
|
|
+ */
|
|
|
+
|
|
|
+#include <linux/kernel.h>
|
|
|
+#include <linux/module.h>
|
|
|
+#include <linux/init.h>
|
|
|
+#include <linux/acpi.h>
|
|
|
+#include <linux/io.h>
|
|
|
+
|
|
|
+#include "apei-internal.h"
|
|
|
+
|
|
|
+#undef pr_fmt
|
|
|
+#define pr_fmt(fmt) "BERT: " fmt
|
|
|
+
|
|
|
+static int bert_disable;
|
|
|
+
|
|
|
+static void __init bert_print_all(struct acpi_bert_region *region,
|
|
|
+ unsigned int region_len)
|
|
|
+{
|
|
|
+ struct acpi_hest_generic_status *estatus =
|
|
|
+ (struct acpi_hest_generic_status *)region;
|
|
|
+ int remain = region_len;
|
|
|
+ u32 estatus_len;
|
|
|
+
|
|
|
+ if (!estatus->block_status)
|
|
|
+ return;
|
|
|
+
|
|
|
+ while (remain > sizeof(struct acpi_bert_region)) {
|
|
|
+ if (cper_estatus_check(estatus)) {
|
|
|
+ pr_err(FW_BUG "Invalid error record.\n");
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ estatus_len = cper_estatus_len(estatus);
|
|
|
+ if (remain < estatus_len) {
|
|
|
+ pr_err(FW_BUG "Truncated status block (length: %u).\n",
|
|
|
+ estatus_len);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ pr_info_once("Error records from previous boot:\n");
|
|
|
+
|
|
|
+ cper_estatus_print(KERN_INFO HW_ERR, estatus);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Because the boot error source is "one-time polled" type,
|
|
|
+ * clear Block Status of current Generic Error Status Block,
|
|
|
+ * once it's printed.
|
|
|
+ */
|
|
|
+ estatus->block_status = 0;
|
|
|
+
|
|
|
+ estatus = (void *)estatus + estatus_len;
|
|
|
+ /* No more error records. */
|
|
|
+ if (!estatus->block_status)
|
|
|
+ return;
|
|
|
+
|
|
|
+ remain -= estatus_len;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int __init setup_bert_disable(char *str)
|
|
|
+{
|
|
|
+ bert_disable = 1;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+__setup("bert_disable", setup_bert_disable);
|
|
|
+
|
|
|
+static int __init bert_check_table(struct acpi_table_bert *bert_tab)
|
|
|
+{
|
|
|
+ if (bert_tab->header.length < sizeof(struct acpi_table_bert) ||
|
|
|
+ bert_tab->region_length < sizeof(struct acpi_bert_region))
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int __init bert_init(void)
|
|
|
+{
|
|
|
+ struct acpi_bert_region *boot_error_region;
|
|
|
+ struct acpi_table_bert *bert_tab;
|
|
|
+ unsigned int region_len;
|
|
|
+ acpi_status status;
|
|
|
+ int rc = 0;
|
|
|
+
|
|
|
+ if (acpi_disabled)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ if (bert_disable) {
|
|
|
+ pr_info("Boot Error Record Table support is disabled.\n");
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ status = acpi_get_table(ACPI_SIG_BERT, 0, (struct acpi_table_header **)&bert_tab);
|
|
|
+ if (status == AE_NOT_FOUND)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ if (ACPI_FAILURE(status)) {
|
|
|
+ pr_err("get table failed, %s.\n", acpi_format_exception(status));
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ rc = bert_check_table(bert_tab);
|
|
|
+ if (rc) {
|
|
|
+ pr_err(FW_BUG "table invalid.\n");
|
|
|
+ return rc;
|
|
|
+ }
|
|
|
+
|
|
|
+ region_len = bert_tab->region_length;
|
|
|
+ if (!request_mem_region(bert_tab->address, region_len, "APEI BERT")) {
|
|
|
+ pr_err("Can't request iomem region <%016llx-%016llx>.\n",
|
|
|
+ (unsigned long long)bert_tab->address,
|
|
|
+ (unsigned long long)bert_tab->address + region_len - 1);
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+
|
|
|
+ boot_error_region = ioremap_cache(bert_tab->address, region_len);
|
|
|
+ if (boot_error_region) {
|
|
|
+ bert_print_all(boot_error_region, region_len);
|
|
|
+ iounmap(boot_error_region);
|
|
|
+ } else {
|
|
|
+ rc = -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ release_mem_region(bert_tab->address, region_len);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+late_initcall(bert_init);
|
Huang Ying