ACPI, APEI/BERT support

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From: Chen, Gong <[email protected]>
To: [email protected]
Cc: Huang Ying <[email protected]>, Tomasz Nowicki <[email protected]>, Chen, Gong <[email protected]>, Tony Luck <[email protected]>
Subject: [PATCH 1/2] ACPI, APEI, Boot Error Record Table (BERT) support
Date: Thu, 7 May 2015 10:57:30 -0400
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From: Huang Ying <[email protected]>

Under normal circumstances, when a hardware error occurs, kernel will be notified via NMI, MCE or some other method, then kernel will process the error condition, report it, and recover it if possible. But sometime, the situation is so bad, so that firmware may choose to reset directly without notifying Linux kernel.

Linux kernel can use the Boot Error Record Table (BERT) to get the un-notified hardware errors that occurred in a previous boot. In this patch, the error information is reported via printk.

For more information about ERST, please refer to ACPI Specification version 5.0, section 18.3.1

Signed-off-by Huang Ying <[email protected]>

Signed-off-by Tomasz Nowicki <[email protected]>

Signed-off-by Chen, Gong <[email protected]>

Tested-by Jonathan (Zhixiong) Zhang <[email protected]>

Cc Tony Luck <[email protected]>

---
 Documentation/kernel-parameters.txt |   3 +
 drivers/acpi/apei/Makefile          |   2 +-
 drivers/acpi/apei/bert.c            | 160
++++++++++++++++++++++++++++++++++++
 include/acpi/apei.h                 |   1 +
 4 files changed, 165 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/apei/bert.c

Documentation/kernel-parameters.txt +0 -0

index 61ab1628a057..9766fb86cb7e 100644
@@ -548,6 +548,9 @@ bytes respectively. Such letter suffixes can also be

entirely omitted.

bootmem_debug [KNL] Enable bootmem allocator debug messages.

Documentation/kernel-parameters.txt +3 -0

+       bert_disable    [ACPI]
+                       Disable Boot Error Record Table (BEST) support.
+
        bttv.card=      [HW,V4L] bttv (bt848 + bt878 based grabber cards)
        bttv.radio=     Most important insmod options are available as
                        kernel args too.

drivers/acpi/apei/Makefile +1 -1

index 5d575a955940..e50573de25f1 100644
@@ -3,4 +3,4 @@ obj-$(CONFIG_ACPI_APEI_GHES)    += ghes.o
 obj-$(CONFIG_ACPI_APEI_EINJ)   += einj.o
 obj-$(CONFIG_ACPI_APEI_ERST_DEBUG) += erst-dbg.o
 
-apei-y := apei-base.o hest.o erst.o
+apei-y := apei-base.o hest.o erst.o bert.o

drivers/acpi/apei/bert.c new file +53 -0

new file mode 100644
index 000000000000..c35a748a2be5
@@ -0,0 +1,160 @@
+/*
+ * APEI Boot Error Record Table (BERT) support
+ *
+ * Copyright 2011 Intel Corp.
+ *   Author: Huang Ying <[email protected]>
+ *
+ * Under normal circumstances, when a hardware error occurs, kernel
+ * will be notified via NMI, MCE or some other method, then kernel
+ * will process the error condition, report it, and recover it if
+ * possible. But sometime, the situation is so bad, so that firmware
+ * may choose to reset directly without notifying Linux kernel.
+ *
+ * Linux kernel can use the Boot Error Record Table (BERT) to get the
+ * un-notified hardware errors that occurred in a previous boot.
+ *
+ * For more information about ERST, 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"
+
+#define BERT_PFX "BERT: "
+
+int bert_disable;
+EXPORT_SYMBOL_GPL(bert_disable);
+
+static void __init bert_print_all(struct acpi_hest_generic_status *region,
+                                 unsigned int region_len)
+{
+       int remain, first = 1;
+       u32 estatus_len;
+       struct acpi_hest_generic_status *estatus;
+
+       remain = region_len;
+       estatus = region;
+       while (remain > sizeof(struct acpi_hest_generic_status)) {
+               /* No more error record */
+               if (!estatus->block_status)
+                       break;
+
+               estatus_len = cper_estatus_len(estatus);
+               if (estatus_len < sizeof(struct acpi_hest_generic_status) ||
+                   remain < estatus_len) {
+                       pr_err(FW_BUG BERT_PFX "Invalid error status block

with length %u\n",

drivers/acpi/apei/bert.c new file +6 -0

+                              estatus_len);
+                       return;
+               }
+
+               if (cper_estatus_check(estatus)) {
+                       pr_err(FW_BUG BERT_PFX "Invalid Error status

block\n");

drivers/acpi/apei/bert.c new file +5 -0

+                       goto next;
+               }
+
+               if (first) {
+                       pr_info(HW_ERR "Error record from previous

boot:\n");

drivers/acpi/apei/bert.c new file +2 -0

+                       first = 0;
+               }

drivers/acpi/apei/bert.c new file +20 -0

+           bert_tab->region_length < sizeof(struct acpi_bert_region))
+               return -EINVAL;
+
+       return 0;
+}
+
+static int __init bert_init(void)
+{
+       acpi_status status;
+       struct acpi_table_bert *bert_tab;
+       struct resource *r;
+       struct acpi_hest_generic_status *bert_region;
+       unsigned int region_len;
+       int rc = -EINVAL;
+
+       if (acpi_disabled)
+               goto out;
+
+       if (bert_disable) {
+               pr_info(BERT_PFX "Boot Error Record Table (BERT) support is

disabled.\n");

drivers/acpi/apei/bert.c new file +30 -0

+               goto out;
+       }
+
+       status = acpi_get_table(ACPI_SIG_BERT, 0,
+                               (struct acpi_table_header **)&bert_tab);
+       if (status == AE_NOT_FOUND) {
+               pr_err(BERT_PFX "Table is not found!\n");
+               goto out;
+       } else if (ACPI_FAILURE(status)) {
+               const char *msg = acpi_format_exception(status);
+
+               pr_err(BERT_PFX "Failed to get table, %s\n", msg);
+               goto out;
+       }
+
+       rc = bert_check_table(bert_tab);
+       if (rc) {
+               pr_err(FW_BUG BERT_PFX "BERT table is invalid\n");
+               goto out;
+       }
+
+       region_len = bert_tab->region_length;
+       if (!region_len) {
+               rc = 0;
+               goto out;
+       }
+
+       r = request_mem_region(bert_tab->address, region_len, "APEI BERT");
+       if (!r) {
+               pr_err(BERT_PFX "Can not request iomem region

<%016llx-%016llx> for BERT.\n",

drivers/acpi/apei/bert.c new file +23 -0

+               rc = -EIO;
+               goto out;
+       }
+
+       bert_region = ioremap_cache(bert_tab->address, region_len);
+       if (!bert_region) {
+               rc = -ENOMEM;
+               goto out_release;
+       }
+
+       bert_print_all(bert_region, region_len);
+
+       iounmap(bert_region);
+
+out_release:
+       release_mem_region(bert_tab->address, region_len);
+out:
+       if (rc)
+               bert_disable = 1;
+
+       return rc;
+}
+late_initcall(bert_init);

include/acpi/apei.h +1 -1

index 76284bb560a6..284801ac7042 100644
@@ -23,6 +23,7 @@ extern bool ghes_disable;
 #else
 #define ghes_disable 1
 #endif
+extern int bert_disable;
 
 #ifdef CONFIG_ACPI_APEI
 void __init acpi_hest_init(void);
--

2.3.2

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