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authorRodrigo Vivi <rodrigo.vivi@intel.com>2023-09-26 12:51:06 -0400
committerRodrigo Vivi <rodrigo.vivi@intel.com>2023-10-02 12:22:09 -0400
commitd38d753da7f7c9c4739e3e9ca3c986fa2c1b8c98 (patch)
tree1060f852face9ee3fce4d8e17d5a16b549e3cdd7 /Documentation/gpu
parent4c7690614c8bbd6cd29b949f9084ddb294ffe284 (diff)
drm/i915: Add missing CCS documentation
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: 944823c94639 ("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
Diffstat (limited to 'Documentation/gpu')
-rw-r--r--Documentation/gpu/i915.rst25
1 files changed, 12 insertions, 13 deletions
diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
index 378e825754d5..13de8bcaaa29 100644
--- a/Documentation/gpu/i915.rst
+++ b/Documentation/gpu/i915.rst
@@ -267,19 +267,18 @@ i915 driver.
Intel GPU Basics
----------------
-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.
+An Intel GPU has multiple engines. There are several engine types:
+
+- 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