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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/Documentation/acpi/apei/einj.txt
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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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- param1

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  This file is used to set the first error parameter value. Effect of

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  parameter depends on error_type specified. For memory error, this is

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  physical memory address.

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- param2

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  This file is used to set the second error parameter value. Effect of

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  parameter depends on error_type specified. For memory error, this is

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  physical memory address mask.

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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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