drm/i915/xehp: compute engine pipe_control

CCS will reuse the RCS functions for breadcrumb and flush emission.
However, CCS pipe_control has additional programming restrictions:
 - Command Streamer Stall Enable must be always set
 - Post Sync Operations must not be set to Write PS Depth Count
 - 3D-related bits must not be set

v2:
 - Drop unwanted blank line.  (Lucas)

Bspec: 47112
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220301231549.1817978-5-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gt/gen8_engine_cs.c

@@ -201,6 +201,8 @@ static u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs)
 
 int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 {
+	struct intel_engine_cs *engine = rq->engine;
+
 	if (mode & EMIT_FLUSH) {
 		u32 flags = 0;
 		u32 *cs;
@@ -219,6 +221,9 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 
 		flags |= PIPE_CONTROL_CS_STALL;
 
+		if (engine->class == COMPUTE_CLASS)
+			flags &= ~PIPE_CONTROL_3D_FLAGS;
+
 		cs = intel_ring_begin(rq, 6);
 		if (IS_ERR(cs))
 			return PTR_ERR(cs);
@@ -246,6 +251,9 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 
 		flags |= PIPE_CONTROL_CS_STALL;
 
+		if (engine->class == COMPUTE_CLASS)
+			flags &= ~PIPE_CONTROL_3D_FLAGS;
+
 		cs = intel_ring_begin(rq, 8 + 4);
 		if (IS_ERR(cs))
 			return PTR_ERR(cs);
@@ -618,19 +626,27 @@ u32 *gen12_emit_fini_breadcrumb_xcs(struct i915_request *rq, u32 *cs)
 
 u32 *gen12_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs)
 {
+	struct drm_i915_private *i915 = rq->engine->i915;
+	u32 flags = (PIPE_CONTROL_CS_STALL |
+		     PIPE_CONTROL_TILE_CACHE_FLUSH |
+		     PIPE_CONTROL_FLUSH_L3 |
+		     PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
+		     PIPE_CONTROL_DEPTH_CACHE_FLUSH |
+		     PIPE_CONTROL_DC_FLUSH_ENABLE |
+		     PIPE_CONTROL_FLUSH_ENABLE);
+
+	if (GRAPHICS_VER(i915) == 12 && GRAPHICS_VER_FULL(i915) < IP_VER(12, 50))
+		/* Wa_1409600907 */
+		flags |= PIPE_CONTROL_DEPTH_STALL;
+
+	if (rq->engine->class == COMPUTE_CLASS)
+		flags &= ~PIPE_CONTROL_3D_FLAGS;
+
 	cs = gen12_emit_ggtt_write_rcs(cs,
 				       rq->fence.seqno,
 				       hwsp_offset(rq),
 				       PIPE_CONTROL0_HDC_PIPELINE_FLUSH,
-				       PIPE_CONTROL_CS_STALL |
-				       PIPE_CONTROL_TILE_CACHE_FLUSH |
-				       PIPE_CONTROL_FLUSH_L3 |
-				       PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
-				       PIPE_CONTROL_DEPTH_CACHE_FLUSH |
-				       /* Wa_1409600907:tgl */
-				       PIPE_CONTROL_DEPTH_STALL |
-				       PIPE_CONTROL_DC_FLUSH_ENABLE |
-				       PIPE_CONTROL_FLUSH_ENABLE);
+				       flags);
 
 	return gen12_emit_fini_breadcrumb_tail(rq, cs);
 }

drivers/gpu/drm/i915/gt/intel_gpu_commands.h

@@ -228,11 +228,14 @@
 #define   PIPE_CONTROL_COMMAND_CACHE_INVALIDATE		(1<<29) /* gen11+ */
 #define   PIPE_CONTROL_TILE_CACHE_FLUSH			(1<<28) /* gen11+ */
 #define   PIPE_CONTROL_FLUSH_L3				(1<<27)
+#define   PIPE_CONTROL_AMFS_FLUSH			(1<<25) /* gen12+ */
 #define   PIPE_CONTROL_GLOBAL_GTT_IVB			(1<<24) /* gen7+ */
 #define   PIPE_CONTROL_MMIO_WRITE			(1<<23)
 #define   PIPE_CONTROL_STORE_DATA_INDEX			(1<<21)
 #define   PIPE_CONTROL_CS_STALL				(1<<20)
+#define   PIPE_CONTROL_GLOBAL_SNAPSHOT_RESET		(1<<19)
 #define   PIPE_CONTROL_TLB_INVALIDATE			(1<<18)
+#define   PIPE_CONTROL_PSD_SYNC				(1<<17) /* gen11+ */
 #define   PIPE_CONTROL_MEDIA_STATE_CLEAR		(1<<16)
 #define   PIPE_CONTROL_WRITE_TIMESTAMP			(3<<14)
 #define   PIPE_CONTROL_QW_WRITE				(1<<14)
@@ -254,6 +257,18 @@
 #define   PIPE_CONTROL_DEPTH_CACHE_FLUSH		(1<<0)
 #define   PIPE_CONTROL_GLOBAL_GTT (1<<2) /* in addr dword */
 
+/* 3D-related flags can't be set on compute engine */
+#define PIPE_CONTROL_3D_FLAGS (\
+		PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH | \
+		PIPE_CONTROL_DEPTH_CACHE_FLUSH | \
+		PIPE_CONTROL_TILE_CACHE_FLUSH | \
+		PIPE_CONTROL_DEPTH_STALL | \
+		PIPE_CONTROL_STALL_AT_SCOREBOARD | \
+		PIPE_CONTROL_PSD_SYNC | \
+		PIPE_CONTROL_AMFS_FLUSH | \
+		PIPE_CONTROL_VF_CACHE_INVALIDATE | \
+		PIPE_CONTROL_GLOBAL_SNAPSHOT_RESET)
+
 #define MI_MATH(x)			MI_INSTR(0x1a, (x) - 1)
 #define MI_MATH_INSTR(opcode, op1, op2) ((opcode) << 20 | (op1) << 10 | (op2))
 /* Opcodes for MI_MATH_INSTR */