[Intel-gfx] [PATCH 0/3] Replace VT-d workaround with guard pages

[Ramalingam C]

On 2021-12-02 at 14:54:21 +0530, Tejas Upadhyay wrote:
> Replace filling the GGTT entirely with scratch pages to avoid invalid
> accesses from VT-d overfetch of scanout by only surrounding scanout vma
> with guard pages. This eliminates the 100+ms delay in resume where we
> have to repopulate the GGTT with scratch.
> 
> This should also help in avoiding slow suspend/resume on GEN11/12
> platforms. Which will also resolve issues with following reported 
> errors : "slow framebuffer consoles issue impacts Linux S3"

Please remove the R-b tag received not from upstreaming review and
change logs for the iterations happened somewhere else.

Ram.
> 
> V2: solved checkpatch warning
> 
> Chris Wilson (3):
>   drm/i915: Wrap all access to i915_vma.node.start|size
>   drm/i915: Introduce guard pages to i915_vma
>   drm/i915: Refine VT-d scanout workaround
> 
>  drivers/gpu/drm/i915/display/intel_dpt.c      |  4 +-
>  drivers/gpu/drm/i915/display/intel_fbdev.c    |  6 +-
>  drivers/gpu/drm/i915/gem/i915_gem_domain.c    | 13 +++++
>  .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 34 ++++++------
>  drivers/gpu/drm/i915/gem/i915_gem_mman.c      |  2 +-
>  drivers/gpu/drm/i915/gem/i915_gem_shrinker.c  |  2 +-
>  drivers/gpu/drm/i915/gem/i915_gem_tiling.c    |  4 +-
>  .../gpu/drm/i915/gem/selftests/huge_pages.c   |  2 +-
>  .../i915/gem/selftests/i915_gem_client_blt.c  | 15 ++---
>  .../drm/i915/gem/selftests/i915_gem_context.c | 19 +++++--
>  .../drm/i915/gem/selftests/i915_gem_mman.c    |  2 +-
>  .../drm/i915/gem/selftests/igt_gem_utils.c    |  6 +-
>  drivers/gpu/drm/i915/gt/gen6_ppgtt.c          |  2 +-
>  drivers/gpu/drm/i915/gt/gen7_renderclear.c    |  2 +-
>  drivers/gpu/drm/i915/gt/gen8_ppgtt.c          |  8 +--
>  drivers/gpu/drm/i915/gt/intel_ggtt.c          | 42 +++++---------
>  drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c  |  3 +-
>  drivers/gpu/drm/i915/gt/intel_ppgtt.c         |  5 +-
>  drivers/gpu/drm/i915/gt/intel_renderstate.c   |  2 +-
>  .../gpu/drm/i915/gt/intel_ring_submission.c   |  2 +-
>  drivers/gpu/drm/i915/gt/selftest_engine_cs.c  |  8 +--
>  drivers/gpu/drm/i915/gt/selftest_execlists.c  | 18 +++---
>  drivers/gpu/drm/i915/gt/selftest_hangcheck.c  | 15 ++---
>  drivers/gpu/drm/i915/gt/selftest_lrc.c        | 16 +++---
>  .../drm/i915/gt/selftest_ring_submission.c    |  2 +-
>  drivers/gpu/drm/i915/gt/selftest_rps.c        | 12 ++--
>  .../gpu/drm/i915/gt/selftest_workarounds.c    |  8 +--
>  drivers/gpu/drm/i915/i915_cmd_parser.c        |  4 +-
>  drivers/gpu/drm/i915/i915_debugfs.c           |  2 +-
>  drivers/gpu/drm/i915/i915_gem_gtt.h           |  1 +
>  drivers/gpu/drm/i915/i915_perf.c              |  2 +-
>  drivers/gpu/drm/i915/i915_vma.c               | 55 ++++++++++++++-----
>  drivers/gpu/drm/i915/i915_vma.h               | 24 +++++++-
>  drivers/gpu/drm/i915/i915_vma_types.h         |  3 +-
>  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 12 +++-
>  drivers/gpu/drm/i915/selftests/i915_request.c | 20 +++----
>  drivers/gpu/drm/i915/selftests/igt_spinner.c  |  8 +--
>  37 files changed, 226 insertions(+), 159 deletions(-)
> 
> -- 
> 2.31.1
>