[Intel-gfx] [PATCH 1/2] drm/i915/xehp: Add compute engine ABI

[Matt Roper <matthew.d.roper@intel.com>]

We're now ready to start exposing compute engines to userspace.

While we're at it, let's extend the kerneldoc description for the other
engine types as well.

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Szymon Morek <szymon.morek@intel.com>
UMD (mesa): https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14395
UMD (compute): https://github.com/intel/compute-runtime/pull/451
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_user.c |  2 +-
 drivers/gpu/drm/i915/gt/intel_gt.c          |  1 +
 drivers/gpu/drm/i915/i915_drm_client.c      |  1 +
 drivers/gpu/drm/i915/i915_drm_client.h      |  2 +-
 include/uapi/drm/i915_drm.h                 | 62 +++++++++++++++++++--
 5 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
index 0f6cd96b459f..46a174f8aa00 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
@@ -47,7 +47,7 @@ static const u8 uabi_classes[] = {
 	[COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY,
 	[VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO,
 	[VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE,
-	/* TODO: Add COMPUTE_CLASS mapping once ABI is available */
+	[COMPUTE_CLASS] = I915_ENGINE_CLASS_COMPUTE,
 };
 
 static int engine_cmp(void *priv, const struct list_head *A,
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 92394f13b42f..c96e123496a5 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -1175,6 +1175,7 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt)
 		[VIDEO_DECODE_CLASS]		= GEN12_VD_TLB_INV_CR,
 		[VIDEO_ENHANCEMENT_CLASS]	= GEN12_VE_TLB_INV_CR,
 		[COPY_ENGINE_CLASS]		= GEN12_BLT_TLB_INV_CR,
+		[COMPUTE_CLASS]			= GEN12_GFX_TLB_INV_CR,
 	};
 	struct drm_i915_private *i915 = gt->i915;
 	struct intel_uncore *uncore = gt->uncore;
diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
index 475a6f824cad..18d38cb59923 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.c
+++ b/drivers/gpu/drm/i915/i915_drm_client.c
@@ -81,6 +81,7 @@ static const char * const uabi_class_names[] = {
 	[I915_ENGINE_CLASS_COPY] = "copy",
 	[I915_ENGINE_CLASS_VIDEO] = "video",
 	[I915_ENGINE_CLASS_VIDEO_ENHANCE] = "video-enhance",
+	[I915_ENGINE_CLASS_COMPUTE] = "compute",
 };
 
 static u64 busy_add(struct i915_gem_context *ctx, unsigned int class)
diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
index 5f5b02b01ba0..f796c5e8e060 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.h
+++ b/drivers/gpu/drm/i915/i915_drm_client.h
@@ -13,7 +13,7 @@
 
 #include "gt/intel_engine_types.h"
 
-#define I915_LAST_UABI_ENGINE_CLASS I915_ENGINE_CLASS_VIDEO_ENHANCE
+#define I915_LAST_UABI_ENGINE_CLASS I915_ENGINE_CLASS_COMPUTE
 
 struct drm_i915_private;
 
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 35ca528803fd..a2def7b27009 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -154,21 +154,71 @@ enum i915_mocs_table_index {
 	I915_MOCS_CACHED,
 };
 
-/*
+/**
+ * enum drm_i915_gem_engine_class - uapi engine type enumeration
+ *
  * Different engines serve different roles, and there may be more than one
- * engine serving each role. enum drm_i915_gem_engine_class provides a
- * classification of the role of the engine, which may be used when requesting
- * operations to be performed on a certain subset of engines, or for providing
- * information about that group.
+ * engine serving each role.  This enum provides a classification of the role
+ * of the engine, which may be used when requesting operations to be performed
+ * on a certain subset of engines, or for providing information about that
+ * group.
  */
 enum drm_i915_gem_engine_class {
+	/**
+	 * @I915_ENGINE_CLASS_RENDER:
+	 *
+	 * Render engines support instructions used for 3D, Compute (GPGPU),
+	 * and programmable media workloads.  These instructions fetch data and
+	 * dispatch individual work items to threads that operate in parallel.
+	 * The threads run small programs (called "kernels" or "shaders") on
+	 * the GPU's execution units (EUs).
+	 */
 	I915_ENGINE_CLASS_RENDER	= 0,
+
+	/**
+	 * @I915_ENGINE_CLASS_COPY:
+	 *
+	 * Copy engines (also referred to as "blitters") support instructions
+	 * that move blocks of data from one location in memory to another,
+	 * or that fill a specified location of memory with fixed data.
+	 * Copy engines can perform pre-defined logical or bitwise operations
+	 * on the source, destination, or pattern data.
+	 */
 	I915_ENGINE_CLASS_COPY		= 1,
+
+	/**
+	 * @I915_ENGINE_CLASS_VIDEO:
+	 *
+	 * Video engines (also referred to as "bit stream decode" (BSD) or
+	 * "vdbox") support instructions that perform fixed-function media
+	 * decode and encode.
+	 */
 	I915_ENGINE_CLASS_VIDEO		= 2,
+
+	/**
+	 * @I915_ENGINE_CLASS_VIDEO_ENHANCE:
+	 *
+	 * Video enhancement engines (also referred to as "vebox") support
+	 * instructions related to image enhancement.
+	 */
 	I915_ENGINE_CLASS_VIDEO_ENHANCE	= 3,
 
-	/* should be kept compact */
+	/**
+	 * @I915_ENGINE_CLASS_COMPUTE:
+	 *
+	 * Compute engines support a subset of the instructions available
+	 * on render engines:  compute engines support Compute (GPGPU) and
+	 * programmable media workloads, but do not support the 3D pipeline.
+	 */
+	I915_ENGINE_CLASS_COMPUTE	= 4,
+
+	/* Values in this enum should be kept compact. */
 
+	/**
+	 * @I915_ENGINE_CLASS_INVALID:
+	 *
+	 * Placeholder value to represent an invalid engine class assignment.
+	 */
 	I915_ENGINE_CLASS_INVALID	= -1
 };
 
-- 
2.35.1