i965/gen9: Add XY_FAST_COPY_BLT support to intelEmitCopyBlit()

This patch enables using XY_FAST_COPY_BLT only for Yf/Ys tiled buffers.
It can be later turned on for other tiling patterns (X,Y) too.

V3: Flush in between sequential fast copy blits.
    Fix src/dst alignment requirements.
    Make can_fast_copy_blit() helper.
    Use ffs(), is_power_of_two()
    Move overlap computation inside intel_miptree_blit().

V4: Use _mesa_regions_overlap() function.
    Add check for src_buffer == dst_buffer.
    Simplify horizontal and vertical alignment computations.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>

1 files changed, 254 insertions, 50 deletions

diff --git a/src/mesa/drivers/dri/i965/intel_blit.c b/src/mesa/drivers/dri/i965/intel_blit.c
index 9fac63d..c773cbc 100644
--- a/src/mesa/drivers/dri/i965/intel_blit.c
+++ b/src/mesa/drivers/dri/i965/intel_blit.c
@@ -27,6 +27,7 @@
 
 
 #include "main/mtypes.h"
+#include "main/blit.h"
 #include "main/context.h"
 #include "main/enums.h"
 #include "main/colormac.h"
@@ -43,6 +44,23 @@
 
 #define FILE_DEBUG_FLAG DEBUG_BLIT
 
+#define SET_TILING_XY_FAST_COPY_BLT(tiling, tr_mode, type)           \
+({                                                                   \
+   switch (tiling) {                                                 \
+   case I915_TILING_X:                                               \
+      CMD |= type ## _TILED_X;                                       \
+      break;                                                         \
+   case I915_TILING_Y:                                               \
+      if (tr_mode == INTEL_MIPTREE_TRMODE_YS)                        \
+         CMD |= type ## _TILED_64K;                                  \
+      else                                                           \
+         CMD |= type ## _TILED_Y;                                    \
+      break;                                                         \
+   default:                                                          \
+      unreachable("not reached");                                    \
+   }                                                                 \
+})
+
 static void
 intel_miptree_set_alpha_to_one(struct brw_context *brw,
                                struct intel_mipmap_tree *mt,
@@ -75,6 +93,10 @@ static uint32_t
 br13_for_cpp(int cpp)
 {
    switch (cpp) {
+   case 16:
+      return BR13_32323232;
+   case 8:
+      return BR13_16161616;
    case 4:
       return BR13_8888;
    case 2:
@@ -86,6 +108,64 @@ br13_for_cpp(int cpp)
    }
 }
 
+static uint32_t
+get_tr_horizontal_align(uint32_t tr_mode, uint32_t cpp, bool is_src) {
+   /* Alignment tables for YF/YS tiled surfaces. */
+   const uint32_t align_2d_yf[] = {64, 64, 32, 32, 16};
+   const uint32_t bpp = cpp * 8;
+   const uint32_t shift = is_src ? 17 : 10;
+   uint32_t align;
+   int i = 0;
+
+   if (tr_mode == INTEL_MIPTREE_TRMODE_NONE)
+      return 0;
+
+   /* Compute array index. */
+   assert (bpp >= 8 && bpp <= 128 && is_power_of_two(bpp));
+   i = ffs(bpp / 8) - 1;
+
+   align = tr_mode == INTEL_MIPTREE_TRMODE_YF ?
+           align_2d_yf[i] :
+           4 * align_2d_yf[i];
+
+   assert(is_power_of_two(align));
+
+   /* XY_FAST_COPY_BLT doesn't support horizontal alignment of 16. */
+   if (align == 16)
+      align = 32;
+
+   return (ffs(align) - 6) << shift;
+}
+
+static uint32_t
+get_tr_vertical_align(uint32_t tr_mode, uint32_t cpp, bool is_src) {
+   /* Vertical alignment tables for YF/YS tiled surfaces. */
+   const unsigned align_2d_yf[] = {64, 32, 32, 16, 16};
+   const uint32_t bpp = cpp * 8;
+   const uint32_t shift = is_src ? 15 : 8;
+   uint32_t align;
+   int i = 0;
+
+   if (tr_mode == INTEL_MIPTREE_TRMODE_NONE)
+      return 0;
+
+   /* Compute array index. */
+   assert (bpp >= 8 && bpp <= 128 && is_power_of_two(bpp));
+   i = ffs(bpp / 8) - 1;
+
+   align = tr_mode == INTEL_MIPTREE_TRMODE_YF ?
+           align_2d_yf[i] :
+           4 * align_2d_yf[i];
+
+   assert(is_power_of_two(align));
+
+   /* XY_FAST_COPY_BLT doesn't support vertical alignments of 16 and 32. */
+   if (align == 16 || align == 32)
+      align = 64;
+
+   return (ffs(align) - 7) << shift;
+}
+
 /**
  * Emits the packet for switching the blitter from X to Y tiled or back.
  *
@@ -278,9 +358,11 @@ intel_miptree_blit(struct brw_context *brw,
                           src_pitch,
                           src_mt->bo, src_mt->offset,
                           src_mt->tiling,
+                          src_mt->tr_mode,
                           dst_mt->pitch,
                           dst_mt->bo, dst_mt->offset,
                           dst_mt->tiling,
+                          dst_mt->tr_mode,
                           src_x, src_y,
                           dst_x, dst_y,
                           width, height,
@@ -313,6 +395,67 @@ alignment_valid(struct brw_context *brw, unsigned offset, uint32_t tiling)
    return true;
 }
 
+static bool
+can_fast_copy_blit(struct brw_context *brw,
+		   drm_intel_bo *src_buffer,
+                   int16_t src_x, int16_t src_y,
+                   uintptr_t src_offset, uint32_t src_pitch,
+                   uint32_t src_tiling, uint32_t src_tr_mode,
+		   drm_intel_bo *dst_buffer,
+                   int16_t dst_x, int16_t dst_y,
+                   uintptr_t dst_offset, uint32_t dst_pitch,
+                   uint32_t dst_tiling, uint32_t dst_tr_mode,
+                   int16_t w, int16_t h, uint32_t cpp)
+{
+   const bool dst_tiling_none = dst_tiling == I915_TILING_NONE;
+   const bool src_tiling_none = src_tiling == I915_TILING_NONE;
+
+   if (brw->gen < 9)
+      return false;
+
+   if (src_buffer->handle == dst_buffer->handle &&
+       _mesa_regions_overlap(src_x, src_y, src_x + w, src_y + h,
+                             dst_x, dst_y, dst_x + w, dst_y + h))
+      return false;
+
+   /* Enable fast copy blit only if the surfaces are Yf/Ys tiled.
+    * FIXME: Based on performance data, remove this condition later to
+    * enable for all types of surfaces.
+    */
+   if (src_tr_mode == INTEL_MIPTREE_TRMODE_NONE &&
+       dst_tr_mode == INTEL_MIPTREE_TRMODE_NONE)
+      return false;
+
+   /* For all surface types buffers must be cacheline-aligned. */
+   if ((dst_offset | src_offset) & 63)
+      return false;
+
+   /* Color depth greater than 128 bits not supported. */
+   if (cpp > 16)
+      return false;
+
+   /* For Fast Copy Blits the pitch cannot be a negative number. So, bit 15
+    * of the destination pitch must be zero.
+    */
+   if ((src_pitch >> 15 & 1) != 0 || (dst_pitch >> 15 & 1) != 0)
+      return false;
+
+   /* For Linear surfaces, the pitch has to be an OWord (16byte) multiple. */
+   if ((src_tiling_none && src_pitch % 16 != 0) ||
+       (dst_tiling_none && dst_pitch % 16 != 0))
+      return false;
+
+   /* For Tiled surfaces, the pitch has to be a multiple of the Tile width
+    * (X direction width of the Tile). This means the pitch value will
+    * always be Cache Line aligned (64byte multiple).
+    */
+   if ((!dst_tiling_none && dst_pitch % 64 != 0) ||
+       (!src_tiling_none && src_pitch % 64 != 0))
+      return false;
+
+   return true;
+}
+
 /* Copy BitBlt
  */
 bool
@@ -322,10 +465,12 @@ intelEmitCopyBlit(struct brw_context *brw,
 		  drm_intel_bo *src_buffer,
 		  GLuint src_offset,
 		  uint32_t src_tiling,
+		  uint32_t src_tr_mode,
 		  GLshort dst_pitch,
 		  drm_intel_bo *dst_buffer,
 		  GLuint dst_offset,
 		  uint32_t dst_tiling,
+		  uint32_t dst_tr_mode,
 		  GLshort src_x, GLshort src_y,
 		  GLshort dst_x, GLshort dst_y,
 		  GLshort w, GLshort h,
@@ -337,18 +482,11 @@ intelEmitCopyBlit(struct brw_context *brw,
    drm_intel_bo *aper_array[3];
    bool dst_y_tiled = dst_tiling == I915_TILING_Y;
    bool src_y_tiled = src_tiling == I915_TILING_Y;
-
-   if (!alignment_valid(brw, dst_offset, dst_tiling))
-      return false;
-   if (!alignment_valid(brw, src_offset, src_tiling))
-      return false;
+   bool use_fast_copy_blit = false;
 
    if ((dst_y_tiled || src_y_tiled) && brw->gen < 6)
       return false;
 
-   assert(!dst_y_tiled || (dst_pitch % 128) == 0);
-   assert(!src_y_tiled || (src_pitch % 128) == 0);
-
    /* do space check before going any further */
    do {
        aper_array[0] = brw->batch.bo;
@@ -373,52 +511,114 @@ intelEmitCopyBlit(struct brw_context *brw,
        src_buffer, src_pitch, src_offset, src_x, src_y,
        dst_buffer, dst_pitch, dst_offset, dst_x, dst_y, w, h);
 
-   /* Blit pitch must be dword-aligned.  Otherwise, the hardware appears to drop
-    * the low bits.  Offsets must be naturally aligned.
-    */
-   if (src_pitch % 4 != 0 || src_offset % cpp != 0 ||
-       dst_pitch % 4 != 0 || dst_offset % cpp != 0)
-      return false;
-
-   /* For big formats (such as floating point), do the copy using 16 or 32bpp
-    * and multiply the coordinates.
-    */
-   if (cpp > 4) {
-      if (cpp % 4 == 2) {
-         dst_x *= cpp / 2;
-         dst_x2 *= cpp / 2;
-         src_x *= cpp / 2;
-         cpp = 2;
-      } else {
-         assert(cpp % 4 == 0);
-         dst_x *= cpp / 4;
-         dst_x2 *= cpp / 4;
-         src_x *= cpp / 4;
-         cpp = 4;
+   use_fast_copy_blit = can_fast_copy_blit(brw,
+                                           src_buffer,
+                                           src_x, src_y,
+                                           src_offset, src_pitch,
+                                           src_tiling, src_tr_mode,
+                                           dst_buffer,
+                                           dst_x, dst_y,
+                                           dst_offset, dst_pitch,
+                                           dst_tiling, dst_tr_mode,
+                                           w, h, cpp);
+   assert(use_fast_copy_blit ||
+          (src_tr_mode == INTEL_MIPTREE_TRMODE_NONE &&
+           dst_tr_mode == INTEL_MIPTREE_TRMODE_NONE));
+
+   if (use_fast_copy_blit) {
+      /* When two sequential fast copy blits have different source surfaces,
+       * but their destinations refer to the same destination surfaces and
+       * therefore destinations overlap it is imperative that a flush be
+       * inserted between the two blits.
+       *
+       * FIXME: Figure out a way to avoid flushing when not required.
+       */
+      brw_emit_mi_flush(brw);
+
+      assert(cpp <= 16);
+      BR13 = br13_for_cpp(cpp);
+
+      if (src_tr_mode == INTEL_MIPTREE_TRMODE_YF)
+         BR13 |= XY_FAST_SRC_TRMODE_YF;
+
+      if (dst_tr_mode == INTEL_MIPTREE_TRMODE_YF)
+         BR13 |= XY_FAST_DST_TRMODE_YF;
+
+      CMD = XY_FAST_COPY_BLT_CMD;
+
+      if (dst_tiling != I915_TILING_NONE) {
+         SET_TILING_XY_FAST_COPY_BLT(dst_tiling, dst_tr_mode, XY_FAST_DST);
+         /* Pitch value should be specified as a number of Dwords. */
+         dst_pitch /= 4;
+      }
+      if (src_tiling != I915_TILING_NONE) {
+         SET_TILING_XY_FAST_COPY_BLT(src_tiling, src_tr_mode, XY_FAST_SRC);
+         /* Pitch value should be specified as a number of Dwords. */
+         src_pitch /= 4;
       }
-   }
 
-   BR13 = br13_for_cpp(cpp) | translate_raster_op(logic_op) << 16;
+      CMD |= get_tr_horizontal_align(src_tr_mode, cpp, true /* is_src */);
+      CMD |= get_tr_vertical_align(src_tr_mode, cpp, true /* is_src */);
 
-   switch (cpp) {
-   case 1:
-   case 2:
-      CMD = XY_SRC_COPY_BLT_CMD;
-      break;
-   case 4:
-      CMD = XY_SRC_COPY_BLT_CMD | XY_BLT_WRITE_ALPHA | XY_BLT_WRITE_RGB;
-      break;
-   default:
-      return false;
-   }
+      CMD |= get_tr_horizontal_align(dst_tr_mode, cpp, false /* is_src */);
+      CMD |= get_tr_vertical_align(dst_tr_mode, cpp, false /* is_src */);
 
-   if (dst_tiling != I915_TILING_NONE) {
-      CMD |= XY_DST_TILED;
-      dst_pitch /= 4;
-   }
-   if (src_tiling != I915_TILING_NONE) {
-      CMD |= XY_SRC_TILED;
-      src_pitch /= 4;
+   } else {
+      assert(!dst_y_tiled || (dst_pitch % 128) == 0);
+      assert(!src_y_tiled || (src_pitch % 128) == 0);
+
+      /* For big formats (such as floating point), do the copy using 16 or
+       * 32bpp and multiply the coordinates.
+       */
+      if (cpp > 4) {
+         if (cpp % 4 == 2) {
+            dst_x *= cpp / 2;
+            dst_x2 *= cpp / 2;
+            src_x *= cpp / 2;
+            cpp = 2;
+         } else {
+            assert(cpp % 4 == 0);
+            dst_x *= cpp / 4;
+            dst_x2 *= cpp / 4;
+            src_x *= cpp / 4;
+            cpp = 4;
+         }
+      }
+
+      if (!alignment_valid(brw, dst_offset, dst_tiling))
+         return false;
+      if (!alignment_valid(brw, src_offset, src_tiling))
+         return false;
+
+      /* Blit pitch must be dword-aligned.  Otherwise, the hardware appears to drop
+       * the low bits.  Offsets must be naturally aligned.
+       */
+      if (src_pitch % 4 != 0 || src_offset % cpp != 0 ||
+          dst_pitch % 4 != 0 || dst_offset % cpp != 0)
+         return false;
+
+      assert(cpp <= 4);
+      BR13 = br13_for_cpp(cpp) | translate_raster_op(logic_op) << 16;
+      switch (cpp) {
+      case 1:
+      case 2:
+         CMD = XY_SRC_COPY_BLT_CMD;
+         break;
+      case 4:
+         CMD = XY_SRC_COPY_BLT_CMD | XY_BLT_WRITE_ALPHA | XY_BLT_WRITE_RGB;
+         break;
+      default:
+         return false;
+      }
+
+      if (dst_tiling != I915_TILING_NONE) {
+         CMD |= XY_DST_TILED;
+         dst_pitch /= 4;
+      }
+      if (src_tiling != I915_TILING_NONE) {
+         CMD |= XY_SRC_TILED;
+         src_pitch /= 4;
+      }
    }
 
    if (dst_y2 <= dst_y || dst_x2 <= dst_x) {
@@ -576,7 +776,9 @@ intel_emit_linear_blit(struct brw_context *brw,
    dst_x = dst_offset % 64;
    ok = intelEmitCopyBlit(brw, 1,
 			  pitch, src_bo, src_offset - src_x, I915_TILING_NONE,
+                          INTEL_MIPTREE_TRMODE_NONE,
 			  pitch, dst_bo, dst_offset - dst_x, I915_TILING_NONE,
+                          INTEL_MIPTREE_TRMODE_NONE,
 			  src_x, 0, /* src x/y */
 			  dst_x, 0, /* dst x/y */
 			  pitch, height, /* w, h */
@@ -595,7 +797,9 @@ intel_emit_linear_blit(struct brw_context *brw,
    if (size != 0) {
       ok = intelEmitCopyBlit(brw, 1,
 			     pitch, src_bo, src_offset - src_x, I915_TILING_NONE,
+                             INTEL_MIPTREE_TRMODE_NONE,
 			     pitch, dst_bo, dst_offset - dst_x, I915_TILING_NONE,
+                             INTEL_MIPTREE_TRMODE_NONE,
 			     src_x, 0, /* src x/y */
 			     dst_x, 0, /* dst x/y */
 			     size, 1, /* w, h */