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drm/i915: Add missing CCS documentation

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Let's introduce the basic documentation about CCS.
While doing that, also removed the legacy execution flag name. That flag
simply doesn't exist for CCS and it is not needed on current context
submission. Those flag names are only needed on legacy context,
while on new ones we only need to pass the engine ID.

It is worth mention that this documentation should probably live with
the engine definitions rather than in the i915.rst file directly and
that more updates are likely need in this section. But this should
come later.

v2: Overall improvements from Matt and Tvrtko.

Fixes: 944823c946 ("drm/i915/xehp: Define compute class and engine")
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Sushma Venkatesh Reddy <sushma.venkatesh.reddy@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230926165107.23440-1-rodrigo.vivi@intel.com
This commit is contained in:
Rodrigo Vivi 2023-09-26 12:51:06 -04:00
parent 4c7690614c
commit d38d753da7
1 changed files with 11 additions and 12 deletions
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23
Documentation/gpu/i915.rst
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@ -267,19 +267,18 @@ i915 driver.
Intel GPU Basics
----------------
An Intel GPU has multiple engines. There are several engine types.
An Intel GPU has multiple engines. There are several engine types:
- RCS engine is for rendering 3D and performing compute, this is named
`I915_EXEC_RENDER` in user space.
- BCS is a blitting (copy) engine, this is named `I915_EXEC_BLT` in user
space.
- VCS is a video encode and decode engine, this is named `I915_EXEC_BSD`
in user space
- VECS is video enhancement engine, this is named `I915_EXEC_VEBOX` in user
space.
- The enumeration `I915_EXEC_DEFAULT` does not refer to specific engine;
instead it is to be used by user space to specify a default rendering
engine (for 3D) that may or may not be the same as RCS.
- Render Command Streamer (RCS). An engine for rendering 3D and
performing compute.
- Blitting Command Streamer (BCS). An engine for performing blitting and/or
copying operations.
- Video Command Streamer. An engine used for video encoding and decoding. Also
sometimes called 'BSD' in hardware documentation.
- Video Enhancement Command Streamer (VECS). An engine for video enhancement.
Also sometimes called 'VEBOX' in hardware documentation.
- Compute Command Streamer (CCS). An engine that has access to the media and
GPGPU pipelines, but not the 3D pipeline.
The Intel GPU family is a family of integrated GPU's using Unified
Memory Access. For having the GPU "do work", user space will feed the