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8781f05152
Implement support for fetching the hardware description table from the GuC. The call is made twice - once without a destination buffer to query the size and then a second time to fill in the buffer. The table is stored in the GT structure so that it can be fetched once at driver load time. Keeping inside a GuC structure would mean it would be release and reloaded on a GuC reset (part of a full GT reset). However, the table does not change just because the GT has been reset and the GuC reloaded. Also, dynamic memory allocations inside the reset path are a problem. Note that the table is only available on ADL-P and later platforms. v2 (John's v2 patch): * Move to GT level to avoid memory allocation during reset path (and unnecessary re-read of the table on a reset). v5 (of Jordan's posting): * Various changes made by Jordan and recommended by Michal - Makefile ordering - Adjust "struct intel_guc_hwconfig hwconfig" comment - Set Copyright year to 2022 in intel_guc_hwconfig.c/.h - Drop inline from hwconfig_to_guc() - Replace hwconfig param with guc in __guc_action_get_hwconfig() - Move zero size check into guc_hwconfig_discover_size() - Change comment to say zero size offset/size is needed to get size - Add has_guc_hwconfig to devinfo and drop has_table() - Change drm_err to notice in __uc_init_hw() and use %pe v6 (of Jordan's posting): * Added a couple more small changes recommended by Michal * Merge in John's v2 patch, but note: - Using drm_notice as recommended by Michal - Reverted Michal's suggestion of using devinfo v7 (of Jordan's posting): * Change back to drm_err as preferred by John Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Acked-by: Jon Bloomfield <jon.bloomfield@intel.com> Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220306232157.1174335-2-jordan.l.justen@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.