Huang Ying wrote:
> Add document for APEI, including kernel parameters and EINJ debug file
> sytem interface.
>
> Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
> Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> ---
> 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
; [or . + new sentence]
> +for debugging and testing of other APEI and RAS features.
> +
> +To use EINJ, make the following is enabled in your kernel
make sure the following are enabled
> +configuration:
> +
> +CONFIG_DEBUG_FS
> +CONFIG_ACPI_APEI
> +CONFIG_ACPI_APEI_EINJ
> +
> +The user interface of EINJ is in debug file system, under the
is the debug file system,
[or "is in the debug file system"]
> +directory apei/einj. The following files are provided.
> +
> +- available_error_type
> + Read this file will return the error injection capability of the
Reading this file returns ...
> + 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,
s/,/;/
> + 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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