linux-kernel - Re: [PATCH v6 0/4] Add support for Vendor Defined Error Types in Einj Module

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Message-ID: <CAJZ5v0icY=_s6hZGajv4cQr4yYoWZACy5sKQGD4qKsf+z2H5UA@mail.gmail.com>
Date:   Tue, 21 Nov 2023 21:12:28 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Avadhut Naik <avadhut.naik@....com>
Cc:     linux-acpi@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        rafael@...nel.org, gregkh@...uxfoundation.org, lenb@...nel.org,
        james.morse@....com, tony.luck@...el.com, bp@...en8.de,
        linux-kernel@...r.kernel.org, alexey.kardashevskiy@....com,
        yazen.ghannam@....com, avadnaik@....com
Subject: Re: [PATCH v6 0/4] Add support for Vendor Defined Error Types in Einj Module

On Thu, Nov 16, 2023 at 11:47 PM Avadhut Naik <avadhut.naik@....com> wrote:
>
> This patchset adds support for Vendor Defined Error types in the einj
> module by exporting a binary blob file in module's debugfs directory.
> Userspace tools can write OEM Defined Structures into the blob file as
> part of injecting Vendor defined errors. Similarly, the very tools can
> also read from the blob file for information, if any, provided by the
> firmware after error injection.
>
> The first patch refactors available_error_type_show() function to ensure
> all errors supported by the platform are output through einj module's
> available_error_type file in debugfs.
>
> The second patch adds a write callback for binary blobs created through
> debugfs_create_blob() API.
>
> The third patch fixes the permissions of panicinfo file in debugfs to
> ensure it remains read-only
>
> The fourth patch adds the required support i.e. establishing the memory
> mapping and exporting it through debugfs blob file for Vendor-defined
> Error types.
>
> Changes in v2:
>  - Split the v1 patch, as was recommended, to have a separate patch for
> changes in debugfs.
>  - Refactored available_error_type_show() function into a separate patch.
>  - Changed file permissions to octal format to remove checkpatch warnings.
>
> Changes in v3:
>  - Use BIT macro for generating error masks instead of hex values since
> ACPI spec uses bit numbers.
>  - Handle the corner case of acpi_os_map_iomem() returning NULL through
> a local variable to a store the size of OEM defined data structure.
>
> Changes in v4:
>  - Fix permissions for panicinfo file in debugfs.
>  - Replace acpi_os_map_iomem() and acpi_os_unmap_iomem() calls with
>    acpi_os_map_memory() and acpi_os_unmap_memory() respectively to avert
>    sparse warnings as suggested by Alexey.
>
> Changes in v5:
>  - Change permissions of the "oem_error" file, being created in einj
>    module's debugfs directory, from "w" to "rw" since system firmware
>    in some cases might provide some information through OEM-defined
>    structure for tools to consume.
>  - Remove Reviewed-by: Alexey Kardashevskiy <aik@....com> from the
>    fourth patch since permissions of the oem_error file have changed.
>  - Add Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> for
>    second and third patch.
>  - Rebase on top of tip master.
>
> Changes in v6:
>  - Minor formatting undertaken in the first and fourth patch per v5
>    feedback by Boris.
>  - Added check in the second patch to ensure that only owners can write
>    into the binary blob files. Mentioned the same in commit description.
>  - Modified commit description of the third patch per recommendations
>    provided by Tony.
>  - Add Reviewed-by: Borislav Petkov (AMD) <bp@...en8.de> for first and
>    fourth patch.
>  - Add Reviewed-by: Tony Luck <tony.luck@...el.com> for second, third and
>    fourth patch.
>
>
> [NOTE:
>
>  - The second patch already had the below tags for v5:
>     Reviewed-by: Alexey Kardashevskiy <aik@....com>
>     Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
>    Since the changes to the patch for v6 are very minimal i.e. addition of
>    a check to ensure that only owners write into the blobs, have retained
>    the tags for v6 as well.
>
>  - Similarly, the third patch already had the below tag for v5:
>     Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
>    Since only the commit description was slightly changed for this patch
>    in v6, have retained the tag for v6 too.
>
>    Having said so, if advised, will attempt to reacquire the tags.]
>
>
> Avadhut Naik (4):
>   ACPI: APEI: EINJ: Refactor available_error_type_show()
>   fs: debugfs: Add write functionality to debugfs blobs
>   platform/chrome: cros_ec_debugfs: Fix permissions for panicinfo
>   ACPI: APEI: EINJ: Add support for vendor defined error types
>
>  drivers/acpi/apei/einj.c                  | 71 +++++++++++++++--------
>  drivers/platform/chrome/cros_ec_debugfs.c |  2 +-
>  fs/debugfs/file.c                         | 28 +++++++--
>  3 files changed, 72 insertions(+), 29 deletions(-)
>
>
> base-commit: a1cc6ec03d1e56b795607fce8442222b37d1dd99
> --

All patches in the series applied as 6.8 material, thanks!