23d2651372
[ Upstream commit 5f60b12edcd0c2e83650a6f9aa4a969bd9fc5732 ] This patch save/restore necessary GVT info during i915 suspend/resume so that GVT enabled QEMU VM can continue running. Only GGTT and fence regs are saved/restored now. GVT will save GGTT entries on each host_entry update, restore the saved dirty entries and re-init fence regs in resume routine. V2: - Change kzalloc/kfree to vzalloc/vfree since the space allocated from kmalloc may not enough for all saved GGTT entries. - Keep gvt suspend/resume wrapper in intel_gvt.h/intel_gvt.c and move the actual implementation to gvt.h/gvt.c. (zhenyu) - Check gvt config on and active with intel_gvt_active(). (zhenyu) V3: (zhenyu) - Incorrect copy length. Should be num entries * entry size. - Use memcpy_toio()/memcpy_fromio() instead of memcpy for iomem. - Add F_PM_SAVE flags to indicate which MMIOs to save/restore for PM. V4: Rebase. V5: Fail intel_gvt_save_ggtt as -ENOMEM if fail to alloc memory to save ggtt. Free allocated ggtt_entries on failure. V6: Save host entry to per-vGPU gtt.ggtt_mm on each host_entry update. V7: Restore GGTT entry based on present bit. Split fence restore and mmio restore in different functions. Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com> Signed-off-by: Colin Xu <colin.xu@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20201027045308.158955-1-colin.xu@intel.com Stable-dep-of: a90c367e5af6 ("drm/i915/gvt: Drop unused helper intel_vgpu_reset_gtt()") Signed-off-by: Sasha Levin <sashal@kernel.org>
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.