drm/i915: Add enum for hardware engine identifiers

Put the engine hardware id in the common header so they are
not only associated with the GuC since they are needed for
the legacy semaphores implementation.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -29,7 +29,7 @@
 static const struct engine_info {
 	const char *name;
 	unsigned exec_id;
-	unsigned guc_id;
+	enum intel_engine_hw_id hw_id;
 	u32 mmio_base;
 	unsigned irq_shift;
 	int (*init_legacy)(struct intel_engine_cs *engine);
@@ -38,7 +38,7 @@ static const struct engine_info {
 	[RCS] = {
 		.name = "render ring",
 		.exec_id = I915_EXEC_RENDER,
-		.guc_id = GUC_RENDER_ENGINE,
+		.hw_id = RCS_HW,
 		.mmio_base = RENDER_RING_BASE,
 		.irq_shift = GEN8_RCS_IRQ_SHIFT,
 		.init_execlists = logical_render_ring_init,
@@ -47,7 +47,7 @@ static const struct engine_info {
 	[BCS] = {
 		.name = "blitter ring",
 		.exec_id = I915_EXEC_BLT,
-		.guc_id = GUC_BLITTER_ENGINE,
+		.hw_id = BCS_HW,
 		.mmio_base = BLT_RING_BASE,
 		.irq_shift = GEN8_BCS_IRQ_SHIFT,
 		.init_execlists = logical_xcs_ring_init,
@@ -56,7 +56,7 @@ static const struct engine_info {
 	[VCS] = {
 		.name = "bsd ring",
 		.exec_id = I915_EXEC_BSD,
-		.guc_id = GUC_VIDEO_ENGINE,
+		.hw_id = VCS_HW,
 		.mmio_base = GEN6_BSD_RING_BASE,
 		.irq_shift = GEN8_VCS1_IRQ_SHIFT,
 		.init_execlists = logical_xcs_ring_init,
@@ -65,7 +65,7 @@ static const struct engine_info {
 	[VCS2] = {
 		.name = "bsd2 ring",
 		.exec_id = I915_EXEC_BSD,
-		.guc_id = GUC_VIDEO_ENGINE2,
+		.hw_id = VCS2_HW,
 		.mmio_base = GEN8_BSD2_RING_BASE,
 		.irq_shift = GEN8_VCS2_IRQ_SHIFT,
 		.init_execlists = logical_xcs_ring_init,
@@ -74,7 +74,7 @@ static const struct engine_info {
 	[VECS] = {
 		.name = "video enhancement ring",
 		.exec_id = I915_EXEC_VEBOX,
-		.guc_id = GUC_VIDEOENHANCE_ENGINE,
+		.hw_id = VECS_HW,
 		.mmio_base = VEBOX_RING_BASE,
 		.irq_shift = GEN8_VECS_IRQ_SHIFT,
 		.init_execlists = logical_xcs_ring_init,
@@ -93,7 +93,7 @@ intel_engine_setup(struct drm_i915_private *dev_priv,
 	engine->i915 = dev_priv;
 	engine->name = info->name;
 	engine->exec_id = info->exec_id;
-	engine->hw_id = engine->guc_id = info->guc_id;
+	engine->hw_id = engine->guc_id = info->hw_id;
 	engine->mmio_base = info->mmio_base;
 	engine->irq_shift = info->irq_shift;
 

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -146,8 +146,14 @@ struct intel_engine_cs {
 #define I915_NUM_ENGINES 5
 #define _VCS(n) (VCS + (n))
 	unsigned int exec_id;
-	unsigned int hw_id;
-	unsigned int guc_id; /* XXX same as hw_id? */
+	enum intel_engine_hw_id {
+		RCS_HW = 0,
+		VCS_HW,
+		BCS_HW,
+		VECS_HW,
+		VCS2_HW
+	} hw_id;
+	enum intel_engine_hw_id guc_id; /* XXX same as hw_id? */
 	u64 fence_context;
 	u32		mmio_base;
 	unsigned int irq_shift;