Re: [PATCH 0/6] Add uAPI to support ICL VME hardware for new media-driver

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Quoting Joonas Lahtinen (2019-01-15 16:47:27)
> Hi all,
> 
> I would like to have some Acked-by's from you, the distro media
> folks Cc'd here, to document your intent to start using Intel's
> new media driver[1]. So if you recognize yourself (or are otherwise
> interested), please read on.
> 
> TL;DR Distro folks, please give your Acked-by on patch [5/6]

A gentle reminder, I'm still looking to hear back from Stephane
and Dave.

We'd like to have this included in the final 5.1 drm-intel-next
pull request this week.

If there are no further comments by Wed, I will conclude that we
have reached a silent agreement, and merge this to give enough
time for Rodrigo to send the PR.

Regards, Joonas

> I believe most are already aware of the situation that Intel
> is moving to the new codebase for libva backend to support new Intel
> integrated graphics devices. The existing intel-libva-driver will
> be continue to be be supported for pre-Icelake platforms (<Gen11).
> Icelake and further platforms will only be supported from the
> new codebase.
> 
> There's the complication that some Icelake features of the new
> driver will require new kernel uAPIs to work... But the new driver
> has not yet been well-established in the community from perspective
> of fulfilling [2]. This is very much due to the demand being low
> as Icelake is not widely available yet. So it's bit of a chicken
> and egg problem as we have a new platform *and* a new codebase for
> it simultaneously.
> 
> Ahead of that community adoption, to ensure that Icelake has good
> kernel support from day one, we'd like to merge kernel support for
> the parts that have functional effect (this series). This is to
> avoid the scenario where end users have to update their distro
> kernels, like happened with Skylake.
> 
> So if I could get Acked-by's from distro folks on the patch [5/6] that
> adds the new uAPI. That would document their intent to become an active
> user of the media-driver[1]. If that happens in the next week or two,
> it would mean that Icelake hardware features would be supported in
> kernel version 5.1 fully from kernel driver point of view.
> 
> The new uAPI is needed to make VME feature functionally work
> on Icelake. It's pretty much a simple enable/disable switch for
> hardware configuration that only includes hardware slices compatible
> with the VME workload. So it's currently limited to the required on/off
> choice to keep things straightforward. The uAPI can be extended in the
> future for possible performance gains for more fine-grained control.
> 
> VME is shared function to handle motion estimation. One intended
> usercase is in Hierarchical Motion Estimation (HME) media kernel. It
> provides a bigger search range with reduced cost for the search. HME
> should improve the encode quality with scenarios where the video has
> a lot of motion in it. Carl (Cc'd) can provide more details if needed.
> 
> The respective IGT tests are reviewed and can be found at:
> 
>   https://patchwork.freedesktop.org/series/49190/
> 
> The userspace changes are reviewed and rebased here:
> 
>   https://github.com/intel/media-driver/pull/271
>   https://github.com/intel/media-driver/pull/463
> 
> Best Regards, Joonas Lahtinen
> 
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Timo Aaltonen <timo.aaltonen@xxxxxxxxxxxxx>
> Cc: Takashi Iwai <tiwai@xxxxxxx>
> Cc: Stephane Marchesin <stephane.marchesin@xxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> 
> PS. This series might result in some CI failures reported as it adds new uAPI
>     and Patchwork / CI synchronization of tests and kernel is currently WIP.
> 
> [1] https://github.com/intel/media-driver
> [2] https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-uapi.html#open-source-userspace-requirements
> 
> Lionel Landwerlin (2):
>   drm/i915: Record the sseu configuration per-context & engine
>   drm/i915/perf: lock powergating configuration to default when active
> 
> Tvrtko Ursulin (4):
>   drm/i915/execlists: Move RPCS setup to context pin
>   drm/i915: Add timeline barrier support
>   drm/i915: Expose RPCS (SSEU) configuration to userspace (Gen11 only)
>   drm/i915/selftests: Context SSEU reconfiguration tests
> 
>  drivers/gpu/drm/i915/i915_drv.h               |  14 +
>  drivers/gpu/drm/i915/i915_gem_context.c       | 354 ++++++++++++-
>  drivers/gpu/drm/i915/i915_gem_context.h       |  10 +
>  drivers/gpu/drm/i915/i915_perf.c              |  13 +-
>  drivers/gpu/drm/i915/i915_request.c           |  13 +
>  drivers/gpu/drm/i915/i915_request.h           |  10 +
>  drivers/gpu/drm/i915/i915_timeline.c          |   3 +
>  drivers/gpu/drm/i915/i915_timeline.h          |  27 +
>  drivers/gpu/drm/i915/intel_lrc.c              | 100 ++--
>  drivers/gpu/drm/i915/intel_lrc.h              |   2 +
>  .../gpu/drm/i915/selftests/i915_gem_context.c | 481 ++++++++++++++++++
>  .../gpu/drm/i915/selftests/mock_timeline.c    |   2 +
>  include/uapi/drm/i915_drm.h                   |  64 +++
>  13 files changed, 1056 insertions(+), 37 deletions(-)
> 
> -- 
> 2.17.2
> 
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