drm/i915/gt: Use XY_FAST_COLOR_BLT to clear obj on graphics ver 12+

Use faster XY_FAST_COLOR_BLT cmd on graphics version of 12 and more,
for clearing (Zero out) the pages of the newly allocated object.

XY_FAST_COLOR_BLT is faster than the older XY_COLOR_BLT.

v2:
  Typo fix at title [Thomas]
v3:
  XY_FAST_COLOR_BLT is used only for FLAT_CCS capable gen12+
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220405150840.29351-3-ramalingam.c@intel.com

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

@@ -206,6 +206,11 @@
 
 #define COLOR_BLT_CMD			(2 << 29 | 0x40 << 22 | (5 - 2))
 #define XY_COLOR_BLT_CMD		(2 << 29 | 0x50 << 22)
+#define XY_FAST_COLOR_BLT_CMD		(2 << 29 | 0x44 << 22)
+#define   XY_FAST_COLOR_BLT_DEPTH_32	(2 << 19)
+#define   XY_FAST_COLOR_BLT_DW		16
+#define   XY_FAST_COLOR_BLT_MOCS_MASK	GENMASK(27, 21)
+#define   XY_FAST_COLOR_BLT_MEM_TYPE_SHIFT 31
 #define SRC_COPY_BLT_CMD		(2 << 29 | 0x43 << 22)
 #define GEN9_XY_FAST_COPY_BLT_CMD	(2 << 29 | 0x42 << 22)
 #define XY_SRC_COPY_BLT_CMD		(2 << 29 | 0x53 << 22)

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

@@ -613,18 +613,51 @@ intel_context_migrate_copy(struct intel_context *ce,
 	return err;
 }
 
-static int emit_clear(struct i915_request *rq, u32 offset, int size, u32 value)
+static int emit_clear(struct i915_request *rq, u32 offset, int size,
+		      u32 value, bool is_lmem)
 {
-	const int ver = GRAPHICS_VER(rq->engine->i915);
+	struct drm_i915_private *i915 = rq->engine->i915;
+	int mocs = rq->engine->gt->mocs.uc_index << 1;
+	const int ver = GRAPHICS_VER(i915);
+	int ring_sz;
 	u32 *cs;
 
 	GEM_BUG_ON(size >> PAGE_SHIFT > S16_MAX);
 
-	cs = intel_ring_begin(rq, ver >= 8 ? 8 : 6);
+	if (HAS_FLAT_CCS(i915) && ver >= 12)
+		ring_sz = XY_FAST_COLOR_BLT_DW;
+	else if (ver >= 8)
+		ring_sz = 8;
+	else
+		ring_sz = 6;
+
+	cs = intel_ring_begin(rq, ring_sz);
 	if (IS_ERR(cs))
 		return PTR_ERR(cs);
 
-	if (ver >= 8) {
+	if (HAS_FLAT_CCS(i915) && ver >= 12) {
+		*cs++ = XY_FAST_COLOR_BLT_CMD | XY_FAST_COLOR_BLT_DEPTH_32 |
+			(XY_FAST_COLOR_BLT_DW - 2);
+		*cs++ = FIELD_PREP(XY_FAST_COLOR_BLT_MOCS_MASK, mocs) |
+			(PAGE_SIZE - 1);
+		*cs++ = 0;
+		*cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
+		*cs++ = offset;
+		*cs++ = rq->engine->instance;
+		*cs++ = !is_lmem << XY_FAST_COLOR_BLT_MEM_TYPE_SHIFT;
+		/* BG7 */
+		*cs++ = value;
+		*cs++ = 0;
+		*cs++ = 0;
+		*cs++ = 0;
+		/* BG11 */
+		*cs++ = 0;
+		*cs++ = 0;
+		/* BG13 */
+		*cs++ = 0;
+		*cs++ = 0;
+		*cs++ = 0;
+	} else if (ver >= 8) {
 		*cs++ = XY_COLOR_BLT_CMD | BLT_WRITE_RGBA | (7 - 2);
 		*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | PAGE_SIZE;
 		*cs++ = 0;
@@ -707,7 +740,7 @@ intel_context_migrate_clear(struct intel_context *ce,
 		if (err)
 			goto out_rq;
 
-		err = emit_clear(rq, offset, len, value);
+		err = emit_clear(rq, offset, len, value, is_lmem);
 
 		/* Arbitration is re-enabled between requests. */
 out_rq: