drm/i915: Update tiled blits selftest

Update the selftest to include Tile 4 mode and switch to Tile 4 on
platforms that supports Tile 4 but no Tile Y and vice versa.
Also switch to XY_FAST_COPY_BLT on platforms that supports it.

v4: update commit message to reflect the code changes properly.
v3: add a function to find X-tile availability for a platform.
v2: disable Tile X for iGPU in fastblit and
    fix checkpath --strict warnings.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5879Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu@intel.com>
Co-developed-by: Nirmoy Das <nirmoy.das@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220516082015.32020-1-nirmoy.das@intel.com

drivers/gpu/drm/i915/gem/selftests/i915_gem_client_blt.c

@@ -6,6 +6,7 @@
 #include "i915_selftest.h"
 
 #include "gt/intel_context.h"
+#include "gt/intel_engine_regs.h"
 #include "gt/intel_engine_user.h"
 #include "gt/intel_gpu_commands.h"
 #include "gt/intel_gt.h"
@@ -18,10 +19,71 @@
 #include "huge_gem_object.h"
 #include "mock_context.h"
 
+#define OW_SIZE 16                      /* in bytes */
+#define F_SUBTILE_SIZE 64               /* in bytes */
+#define F_TILE_WIDTH 128                /* in bytes */
+#define F_TILE_HEIGHT 32                /* in pixels */
+#define F_SUBTILE_WIDTH  OW_SIZE        /* in bytes */
+#define F_SUBTILE_HEIGHT 4              /* in pixels */
+
+static int linear_x_y_to_ftiled_pos(int x, int y, u32 stride, int bpp)
+{
+	int tile_base;
+	int tile_x, tile_y;
+	int swizzle, subtile;
+	int pixel_size = bpp / 8;
+	int pos;
+
+	/*
+	 * Subtile remapping for F tile. Note that map[a]==b implies map[b]==a
+	 * so we can use the same table to tile and until.
+	 */
+	static const u8 f_subtile_map[] = {
+		 0,  1,  2,  3,  8,  9, 10, 11,
+		 4,  5,  6,  7, 12, 13, 14, 15,
+		16, 17, 18, 19, 24, 25, 26, 27,
+		20, 21, 22, 23, 28, 29, 30, 31,
+		32, 33, 34, 35, 40, 41, 42, 43,
+		36, 37, 38, 39, 44, 45, 46, 47,
+		48, 49, 50, 51, 56, 57, 58, 59,
+		52, 53, 54, 55, 60, 61, 62, 63
+	};
+
+	x *= pixel_size;
+	/*
+	 * Where does the 4k tile start (in bytes)?  This is the same for Y and
+	 * F so we can use the Y-tile algorithm to get to that point.
+	 */
+	tile_base =
+		y / F_TILE_HEIGHT * stride * F_TILE_HEIGHT +
+		x / F_TILE_WIDTH * 4096;
+
+	/* Find pixel within tile */
+	tile_x = x % F_TILE_WIDTH;
+	tile_y = y % F_TILE_HEIGHT;
+
+	/* And figure out the subtile within the 4k tile */
+	subtile = tile_y / F_SUBTILE_HEIGHT * 8 + tile_x / F_SUBTILE_WIDTH;
+
+	/* Swizzle the subtile number according to the bspec diagram */
+	swizzle = f_subtile_map[subtile];
+
+	/* Calculate new position */
+	pos = tile_base +
+		swizzle * F_SUBTILE_SIZE +
+		tile_y % F_SUBTILE_HEIGHT * OW_SIZE +
+		tile_x % F_SUBTILE_WIDTH;
+
+	GEM_BUG_ON(!IS_ALIGNED(pos, pixel_size));
+
+	return pos / pixel_size * 4;
+}
+
 enum client_tiling {
 	CLIENT_TILING_LINEAR,
 	CLIENT_TILING_X,
 	CLIENT_TILING_Y,
+	CLIENT_TILING_4,
 	CLIENT_NUM_TILING_TYPES
 };
 
@@ -45,6 +107,36 @@ struct tiled_blits {
 	u32 height;
 };
 
+static bool supports_x_tiling(const struct drm_i915_private *i915)
+{
+	int gen = GRAPHICS_VER(i915);
+
+	if (gen < 12)
+		return true;
+
+	if (!HAS_LMEM(i915) || IS_DG1(i915))
+		return false;
+
+	return true;
+}
+
+static bool fast_blit_ok(const struct blit_buffer *buf)
+{
+	int gen = GRAPHICS_VER(buf->vma->vm->i915);
+
+	if (gen < 9)
+		return false;
+
+	if (gen < 12)
+		return true;
+
+	/* filter out platforms with unsupported X-tile support in fastblit */
+	if (buf->tiling == CLIENT_TILING_X && !supports_x_tiling(buf->vma->vm->i915))
+		return false;
+
+	return true;
+}
+
 static int prepare_blit(const struct tiled_blits *t,
 			struct blit_buffer *dst,
 			struct blit_buffer *src,
@@ -59,6 +151,56 @@ static int prepare_blit(const struct tiled_blits *t,
 	if (IS_ERR(cs))
 		return PTR_ERR(cs);
 
+	if (fast_blit_ok(dst) && fast_blit_ok(src)) {
+		struct intel_gt *gt = t->ce->engine->gt;
+		u32 src_tiles = 0, dst_tiles = 0;
+		u32 src_4t = 0, dst_4t = 0;
+
+		/* Need to program BLIT_CCTL if it is not done previously
+		 * before using XY_FAST_COPY_BLT
+		 */
+		*cs++ = MI_LOAD_REGISTER_IMM(1);
+		*cs++ = i915_mmio_reg_offset(BLIT_CCTL(t->ce->engine->mmio_base));
+		*cs++ = (BLIT_CCTL_SRC_MOCS(gt->mocs.uc_index) |
+			 BLIT_CCTL_DST_MOCS(gt->mocs.uc_index));
+
+		src_pitch = t->width; /* in dwords */
+		if (src->tiling == CLIENT_TILING_4) {
+			src_tiles = XY_FAST_COPY_BLT_D0_SRC_TILE_MODE(YMAJOR);
+			src_4t = XY_FAST_COPY_BLT_D1_SRC_TILE4;
+		} else if (src->tiling == CLIENT_TILING_Y) {
+			src_tiles = XY_FAST_COPY_BLT_D0_SRC_TILE_MODE(YMAJOR);
+		} else if (src->tiling == CLIENT_TILING_X) {
+			src_tiles = XY_FAST_COPY_BLT_D0_SRC_TILE_MODE(TILE_X);
+		} else {
+			src_pitch *= 4; /* in bytes */
+		}
+
+		dst_pitch = t->width; /* in dwords */
+		if (dst->tiling == CLIENT_TILING_4) {
+			dst_tiles = XY_FAST_COPY_BLT_D0_DST_TILE_MODE(YMAJOR);
+			dst_4t = XY_FAST_COPY_BLT_D1_DST_TILE4;
+		} else if (dst->tiling == CLIENT_TILING_Y) {
+			dst_tiles = XY_FAST_COPY_BLT_D0_DST_TILE_MODE(YMAJOR);
+		} else if (dst->tiling == CLIENT_TILING_X) {
+			dst_tiles = XY_FAST_COPY_BLT_D0_DST_TILE_MODE(TILE_X);
+		} else {
+			dst_pitch *= 4; /* in bytes */
+		}
+
+		*cs++ = GEN9_XY_FAST_COPY_BLT_CMD | (10 - 2) |
+			src_tiles | dst_tiles;
+		*cs++ = src_4t | dst_4t | BLT_DEPTH_32 | dst_pitch;
+		*cs++ = 0;
+		*cs++ = t->height << 16 | t->width;
+		*cs++ = lower_32_bits(dst->vma->node.start);
+		*cs++ = upper_32_bits(dst->vma->node.start);
+		*cs++ = 0;
+		*cs++ = src_pitch;
+		*cs++ = lower_32_bits(src->vma->node.start);
+		*cs++ = upper_32_bits(src->vma->node.start);
+	} else {
+		if (ver >= 6) {
 			*cs++ = MI_LOAD_REGISTER_IMM(1);
 			*cs++ = i915_mmio_reg_offset(BCS_SWCTRL);
 			cmd = (BCS_SRC_Y | BCS_DST_Y) << 16;
@@ -75,6 +217,7 @@ static int prepare_blit(const struct tiled_blits *t,
 			*cs++ = 0;
 			*cs++ = 0;
 			*cs++ = 0;
+		}
 
 		cmd = XY_SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (8 - 2);
 		if (ver >= 8)
@@ -104,6 +247,7 @@ static int prepare_blit(const struct tiled_blits *t,
 		*cs++ = lower_32_bits(src->vma->node.start);
 		if (use_64b_reloc)
 			*cs++ = upper_32_bits(src->vma->node.start);
+	}
 
 	*cs++ = MI_BATCH_BUFFER_END;
 
@@ -181,7 +325,13 @@ static int tiled_blits_create_buffers(struct tiled_blits *t,
 
 		t->buffers[i].vma = vma;
 		t->buffers[i].tiling =
-			i915_prandom_u32_max_state(CLIENT_TILING_Y + 1, prng);
+			i915_prandom_u32_max_state(CLIENT_NUM_TILING_TYPES, prng);
+
+		/* Platforms support either TileY or Tile4, not both */
+		if (HAS_4TILE(i915) && t->buffers[i].tiling == CLIENT_TILING_Y)
+			t->buffers[i].tiling = CLIENT_TILING_4;
+		else if (!HAS_4TILE(i915) && t->buffers[i].tiling == CLIENT_TILING_4)
+			t->buffers[i].tiling = CLIENT_TILING_Y;
 	}
 
 	return 0;
@@ -206,7 +356,8 @@ static u64 swizzle_bit(unsigned int bit, u64 offset)
 static u64 tiled_offset(const struct intel_gt *gt,
 			u64 v,
 			unsigned int stride,
-			enum client_tiling tiling)
+			enum client_tiling tiling,
+			int x_pos, int y_pos)
 {
 	unsigned int swizzle;
 	u64 x, y;
@@ -216,7 +367,12 @@ static u64 tiled_offset(const struct intel_gt *gt,
 
 	y = div64_u64_rem(v, stride, &x);
 
-	if (tiling == CLIENT_TILING_X) {
+	if (tiling == CLIENT_TILING_4) {
+		v = linear_x_y_to_ftiled_pos(x_pos, y_pos, stride, 32);
+
+		/* no swizzling for f-tiling */
+		swizzle = I915_BIT_6_SWIZZLE_NONE;
+	} else if (tiling == CLIENT_TILING_X) {
 		v = div64_u64_rem(y, 8, &y) * stride * 8;
 		v += y * 512;
 		v += div64_u64_rem(x, 512, &x) << 12;
@@ -259,6 +415,7 @@ static const char *repr_tiling(enum client_tiling tiling)
 	case CLIENT_TILING_LINEAR: return "linear";
 	case CLIENT_TILING_X: return "X";
 	case CLIENT_TILING_Y: return "Y";
+	case CLIENT_TILING_4: return "F";
 	default: return "unknown";
 	}
 }
@@ -284,7 +441,7 @@ static int verify_buffer(const struct tiled_blits *t,
 	} else {
 		u64 v = tiled_offset(buf->vma->vm->gt,
 				     p * 4, t->width * 4,
-				     buf->tiling);
+				     buf->tiling, x, y);
 
 		if (vaddr[v / sizeof(*vaddr)] != buf->start_val + p)
 			ret = -EINVAL;
@@ -504,6 +661,9 @@ static int tiled_blits_bounce(struct tiled_blits *t, struct rnd_state *prng)
 	if (err)
 		return err;
 
+	/* Simulating GTT eviction of the same buffer / layout */
+	t->buffers[2].tiling = t->buffers[0].tiling;
+
 	/* Reposition so that we overlap the old addresses, and slightly off */
 	err = tiled_blit(t,
 			 &t->buffers[2], t->hole + t->align,

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

@@ -236,6 +236,28 @@
 #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   XY_FAST_COPY_BLT_D0_SRC_TILING_MASK     REG_GENMASK(21, 20)
+#define   XY_FAST_COPY_BLT_D0_DST_TILING_MASK     REG_GENMASK(14, 13)
+#define   XY_FAST_COPY_BLT_D0_SRC_TILE_MODE(mode)  \
+	REG_FIELD_PREP(XY_FAST_COPY_BLT_D0_SRC_TILING_MASK, mode)
+#define   XY_FAST_COPY_BLT_D0_DST_TILE_MODE(mode)  \
+	REG_FIELD_PREP(XY_FAST_COPY_BLT_D0_DST_TILING_MASK, mode)
+#define     LINEAR				0
+#define     TILE_X				0x1
+#define     XMAJOR				0x1
+#define     YMAJOR				0x2
+#define     TILE_64			0x3
+#define   XY_FAST_COPY_BLT_D1_SRC_TILE4	REG_BIT(31)
+#define   XY_FAST_COPY_BLT_D1_DST_TILE4	REG_BIT(30)
+#define BLIT_CCTL_SRC_MOCS_MASK  REG_GENMASK(6, 0)
+#define BLIT_CCTL_DST_MOCS_MASK  REG_GENMASK(14, 8)
+/* Note:  MOCS value = (index << 1) */
+#define BLIT_CCTL_SRC_MOCS(idx) \
+	REG_FIELD_PREP(BLIT_CCTL_SRC_MOCS_MASK, (idx) << 1)
+#define BLIT_CCTL_DST_MOCS(idx) \
+	REG_FIELD_PREP(BLIT_CCTL_DST_MOCS_MASK, (idx) << 1)
+
 #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)