[Intel-gfx] [PATCH 0/6] drm/i915: expose RCS topology to userspace

[Lionel Landwerlin]

Hi all,

This series a respin of a few attempts ([1], [2], [3]) to expose RCS
topology to userspace.

The motivation for this is to be able to monitor part of the GPU using
i915 perf and have detailled knowledge about what execution units are
fused off. Let's say you monitor slice 1, knowing how many EUs are
actually usuable on that slice is critical to provide normalized
numbers (like average busyness of the EUs on slice1) on that
particular part of the GPU. Currently numbers returned like
I915_PARAM_EU_TOTAL don't give us that information.

This series introduces a new uAPI to query information from i915. It's
partially inspired by the amdgpu_cs_ioctl, although we don't allow
setting values onto the device, only queries. There is a good chance
this new uAPI will be reused for exposing available engines (Tvrtko
was looking into this).

Thanks,

[1]: https://patchwork.freedesktop.org/patch/185959/
[2]: https://patchwork.freedesktop.org/series/33436/
[3]: https://patchwork.freedesktop.org/series/33950/

Lionel Landwerlin (6):
  drm/i915: store all subslice masks
  drm/i915/debugfs: reuse max slice/subslices already stored in sseu
  drm/i915/debugfs: add rcs topology entry
  drm/i915: add rcs topology to error state
  drm/i915: add query uAPI
  drm/i915: expose rcs topology through query uAPI

 drivers/gpu/drm/i915/Makefile            |   1 +
 drivers/gpu/drm/i915/i915_debugfs.c      |  87 ++++++++++-----
 drivers/gpu/drm/i915/i915_drv.c          |   3 +-
 drivers/gpu/drm/i915/i915_drv.h          |  26 ++++-
 drivers/gpu/drm/i915/i915_gpu_error.c    |  35 ++++++
 drivers/gpu/drm/i915/i915_query.c        | 186 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_device_info.c | 169 ++++++++++++++++++++--------
 drivers/gpu/drm/i915/intel_lrc.c         |   2 +-
 drivers/gpu/drm/i915/intel_query_info.c  |  88 +++++++++++++++
 drivers/gpu/drm/i915/intel_ringbuffer.h  |   2 +-
 include/uapi/drm/i915_drm.h              |  76 +++++++++++++
 11 files changed, 598 insertions(+), 77 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_query.c
 create mode 100644 drivers/gpu/drm/i915/intel_query_info.c

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2.15.1