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+ APEI Error INJection
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+ ~~~~~~~~~~~~~~~~~~~~
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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Huang Ying