linux-kernel - [PATCH 05/12] ACPI, APEI, Document for APEI

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Message-Id: <1272350481-27951-6-git-send-email-ying.huang@intel.com>
Date:	Tue, 27 Apr 2010 14:41:14 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	lenb@...nel.org
Cc:	linux-kernel@...r.kernel.org, ying.huang@...el.com,
	andi@...stfloor.org, linux-acpi@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 05/12] ACPI, APEI, Document for APEI

Add document for APEI, including kernel parameters and EINJ debug file
sytem interface.

Signed-off-by: Huang Ying <ying.huang@...el.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 Documentation/acpi/apei/einj.txt    |   49 ++++++++++++++++++++++++++++++++++++
 Documentation/kernel-parameters.txt |    5 +++
 2 files changed, 54 insertions(+)
 create mode 100644 Documentation/acpi/apei/einj.txt

--- /dev/null
+++ b/Documentation/acpi/apei/einj.txt
@@ -0,0 +1,49 @@
+			APEI Error INJection
+			~~~~~~~~~~~~~~~~~~~~
+
+EINJ provides a hardware error injection mechanism, it is very useful
+for debugging and testing of other APEI and RAS features.
+
+To use EINJ, make the following is enabled in your kernel
+configuration:
+
+CONFIG_DEBUG_FS
+CONFIG_ACPI_APEI
+CONFIG_ACPI_APEI_EINJ
+
+The user interface of EINJ is in debug file system, under the
+directory apei/einj. The following files are provided.
+
+- available_error_type
+  Read this file will return the error injection capability of the
+  platform, that is, which error types are supported. The error type
+  definition is as follow, the left field is the error type value, the
+  right field is error description.
+
+    0x00000001	Processor Correctable
+    0x00000002	Processor Uncorrectable non-fatal
+    0x00000004	Processor Uncorrectable fatal
+    0x00000008  Memory Correctable
+    0x00000010  Memory Uncorrectable non-fatal
+    0x00000020  Memory Uncorrectable fatal
+    0x00000040	PCI Express Correctable
+    0x00000080	PCI Express Uncorrectable fatal
+    0x00000100	PCI Express Uncorrectable non-fatal
+    0x00000200	Platform Correctable
+    0x00000400	Platform Uncorrectable non-fatal
+    0x00000800	Platform Uncorrectable fatal
+
+  The format of file contents are as above, except there are only the
+  available error type lines.
+
+- error_type
+  This file is used to set the error type value. The error type value
+  is defined in "available_error_type" description.
+
+- error_inject
+  Write any integer to this file to trigger the error
+  injection. Before this, please specify all necessary error
+  parameters.
+
+For more information about EINJ, please refer to ACPI specification
+version 4.0, section 17.5.
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -843,6 +843,11 @@ and is between 256 and 4096 characters.
 	hd=		[EIDE] (E)IDE hard drive subsystem geometry
 			Format: <cyl>,<head>,<sect>
 
+	hest_disable	[ACPI]
+			Disable Hardware Error Source Table (HEST) support,
+			corresponding firmware-first mode error processing
+			logic will be disabled.
+
 	highmem=nn[KMG]	[KNL,BOOT] forces the highmem zone to have an exact
 			size of <nn>. This works even on boxes that have no
 			highmem otherwise. This also works to reduce highmem
--
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