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For platforms with GMD_ID registers, the IP stepping should be determined from the 'revid' field of those registers rather than from the PCI revid. The hardware teams have indicated that they plan to keep the revid => stepping mapping consistent across all GMD_ID platforms, with major steppings (A0, B0, C0, etc.) having revids that are multiples of 4, and minor steppings (A1, A2, A3, etc.) taking the intermediate values. For now we'll trust that hardware follows through on this plan; if they have to change direction in the future (e.g., they wind up needing something like an "A4" that doesn't fit this scheme), we can add a GMD_ID-based lookup table when the time comes. v2: - Set xe->info.platform before finding stepping; the pre-GMD_ID code relies on this value to pick a lookup table. v3: - Also set xe->info.subplatform before picking the stepping for pre-GMD_ID lookup. Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com> Link: https://lore.kernel.org/r/20230524185952.666158-1-matthew.d.roper@intel.com Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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.