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To properly support VF Save/Restore procedure, fixups need to be applied after PF driver finishes its part of VF Restore. The fixups are required to adjust the ongoing execution for a hardware switch that happened, because some GFX resources are not fully virtualized, and assigned to a VF as range from a global pool. The VF on which a VM is restored will often have different ranges provisioned than the VF on which save process happened. Those resource fixups are applied by the VF driver within a restored VM. A VF driver gets informed that it was migrated by receiving an interrupt from each GuC. The interrupt assigned for that purpose is "GUC SW interrupt 0". Seeing that fields set from within the irq handler should be the trigger for fixups. The VF can safely do post-migration fixups on resources associated to each GuC only after that GuC issued the MIGRATED interrupt. This change introduces a worker to be used for post-migration fixups, and a mechanism to schedule said worker when all GuCs sent the irq. v2: renamed and moved functions, updated logged messages, removed unused includes, used anon struct (Michal) v3: ordering, kerneldoc, asserts, debug messages, on_all_tiles -> on_all_gts (Michal) v4: fixed missing header include v5: Explained what fixups are, explained which IRQ is used, style fixes (Michal) Bspec: 50868 Signed-off-by: Tomasz Lis <tomasz.lis@intel.com> Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241104213449.1455694-2-tomasz.lis@intel.com Signed-off-by: Michal Wajdeczko <michal.wajdeczko@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 reStructuredText 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.