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