[v7,0/2] Enable GVT suspend/resume

Message

Colin Xu Oct. 27, 2020, 4:52 a.m. UTC

This patchset enables GVT suspend/resume so that GVT enabled VM can
continue running after host resuming from suspend state.

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_pm_suspend if fail to save ggtt.

V6:
Save host entry to per-vGPU gtt.ggtt_mm on each host_entry update so
that no need to read from HW and save during suspend.

V7:
Restore GGTT entry based on present bit.
Split fence restore and mmio restore in different functions.

Colin Xu (2):
  drm/i915/gvt: Save/restore HW status to support GVT suspend/resume
  drm/i915/gvt: Add GVT resume routine to i915

 drivers/gpu/drm/i915/gvt/gtt.c      | 64 +++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/gvt/gtt.h      |  4 ++
 drivers/gpu/drm/i915/gvt/gvt.c      |  9 ++++
 drivers/gpu/drm/i915/gvt/gvt.h      |  3 ++
 drivers/gpu/drm/i915/gvt/handlers.c | 44 ++++++++++++++++++--
 drivers/gpu/drm/i915/gvt/mmio.h     |  4 ++
 drivers/gpu/drm/i915/i915_drv.c     |  2 +
 drivers/gpu/drm/i915/intel_gvt.c    | 15 +++++++
 drivers/gpu/drm/i915/intel_gvt.h    |  5 +++
 9 files changed, 147 insertions(+), 3 deletions(-)