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OSPM can discover the error injection capabilities of the platform by executing GET_ERROR_TYPE error injection action.[1] The action returns a DWORD representing a bitmap of platform supported error injections.[2] The available_error_type_show() function determines the bits set within this DWORD and provides a verbose output, from einj_error_type_string array, through /sys/kernel/debug/apei/einj/available_error_type file. The function however, assumes one to one correspondence between an error's position in the bitmap and its array entry offset. Consequently, some errors like Vendor Defined Error Type fail this assumption and will incorrectly be shown as not supported, even if their corresponding bit is set in the bitmap and they have an entry in the array. Navigate around the issue by converting einj_error_type_string into an array of structures with a predetermined mask for all error types corresponding to their bit position in the DWORD returned by GET_ERROR_TYPE action. The same breaks the aforementioned assumption resulting in all supported error types by a platform being outputted through the above available_error_type file. [1] ACPI specification 6.5, Table 18.25 [2] ACPI specification 6.5, Table 18.30 Suggested-by: Alexey Kardashevskiy <alexey.kardashevskiy@amd.com> Signed-off-by: Avadhut Naik <Avadhut.Naik@amd.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.