From d38d753da7f7c9c4739e3e9ca3c986fa2c1b8c98 Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Tue, 26 Sep 2023 12:51:06 -0400 Subject: 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 Cc: Sushma Venkatesh Reddy Cc: Joonas Lahtinen Cc: Tvrtko Ursulin Signed-off-by: Rodrigo Vivi Acked-by: Tvrtko Ursulin Reviewed-by: Matt Roper Link: https://patchwork.freedesktop.org/patch/msgid/20230926165107.23440-1-rodrigo.vivi@intel.com --- Documentation/gpu/i915.rst | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) (limited to 'Documentation/gpu') 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 -- cgit From 587e80dc1cb5f1f3f41b38356d3e3563c01d9d8e Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Tue, 26 Sep 2023 13:55:54 -0400 Subject: drm/i915: Add missing GSCCS documentation Introduce the basic documentation about GSC CS. This "GPU Basics" section is focused on explaining the hardware rather than the driver/uapi, so let's make sure GSC is also properly documented here. v2: Fixes from Matt: typos and acronym. Fixes: 5fd974d164b4 ("drm/i915/mtl: add initial definitions for GSC CS") Suggested-by: Matt Roper Cc: Daniele Ceraolo Spurio Cc: Tvrtko Ursulin Signed-off-by: Rodrigo Vivi Reviewed-by: Matt Roper Link: https://patchwork.freedesktop.org/patch/msgid/20230926175554.25968-1-rodrigo.vivi@intel.com --- Documentation/gpu/i915.rst | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/gpu') diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst index 13de8bcaaa29..0ca1550fd9dc 100644 --- a/Documentation/gpu/i915.rst +++ b/Documentation/gpu/i915.rst @@ -279,6 +279,10 @@ An Intel GPU has multiple engines. There are several engine types: 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. +- Graphics Security Controller (GSCCS). A dedicated engine for internal + communication with GSC controller on security related tasks like + High-bandwidth Digital Content Protection (HDCP), Protected Xe Path (PXP), + and HuC firmware authentication. 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 -- cgit