linux-kernel - [RFC PATCH v3 0/3] Add support for Vendor Defined Error Types in Einj Module

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Message-ID: <20230612215139.5132-1-Avadhut.Naik@amd.com>
Date:   Mon, 12 Jun 2023 21:51:36 +0000
From:   Avadhut Naik <Avadhut.Naik@....com>
To:     <rafael@...nel.org>, <gregkh@...uxfoundation.org>,
        <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>
CC:     <avadnaik@....com>, <yazen.ghannam@....com>,
        <alexey.kardashevskiy@....com>, <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH v3 0/3] Add support for Vendor Defined Error Types in Einj Module

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.

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 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.

Avadhut Naik (3):
  ACPI: APEI: EINJ: Refactor available_error_type_show()
  fs: debugfs: Add write functionality to debugfs blobs
  ACPI: APEI: EINJ: Add support for vendor defined error types

 drivers/acpi/apei/einj.c | 67 +++++++++++++++++++++++++++-------------
 fs/debugfs/file.c        | 28 ++++++++++++++---
 2 files changed, 69 insertions(+), 26 deletions(-)

-- 
2.34.1