ilo: add BLT-based blitting methods to ilo_blitter

Port BLT code in ilo_blit.c to BLT-based blitting methods of ilo_blitter.  Add
BLT-based clears.  The latter is verifed with util_clear(), but it is not in
use yet.

4 files changed, 847 insertions, 495 deletions

diff --git a/src/gallium/drivers/ilo/Makefile.sources b/src/gallium/drivers/ilo/Makefile.sources
index 363ae172f18..1612a774519 100644
--- a/src/gallium/drivers/ilo/Makefile.sources
+++ b/src/gallium/drivers/ilo/Makefile.sources
@@ -6,6 +6,7 @@ C_SOURCES := \
 	ilo_3d_pipeline_gen7.c \
 	ilo_blit.c \
 	ilo_blitter.c \
+	ilo_blitter_blt.c \
 	ilo_blitter_pipe.c \
 	ilo_context.c \
 	ilo_cp.c \
diff --git a/src/gallium/drivers/ilo/ilo_blit.c b/src/gallium/drivers/ilo/ilo_blit.c
index 3c1695950eb..0041cd10916 100644
--- a/src/gallium/drivers/ilo/ilo_blit.c
+++ b/src/gallium/drivers/ilo/ilo_blit.c
@@ -25,7 +25,6 @@
  *    Chia-I Wu <olv@lunarg.com>
  */
 
-#include "util/u_pack_color.h"
 #include "util/u_surface.h"
 #include "intel_reg.h"
 
@@ -36,424 +35,6 @@
 #include "ilo_screen.h"
 #include "ilo_blit.h"
 
-/*
- * From the Sandy Bridge PRM, volume 1 part 5, page 7:
- *
- *     "The BLT engine is capable of transferring very large quantities of
- *      graphics data. Any graphics data read from and written to the
- *      destination is permitted to represent a number of pixels that occupies
- *      up to 65,536 scan lines and up to 32,768 bytes per scan line at the
- *      destination. The maximum number of pixels that may be represented per
- *      scan line's worth of graphics data depends on the color depth."
- */
-static const int gen6_max_bytes_per_scanline = 32768;
-static const int gen6_max_scanlines = 65536;
-
-static void
-ilo_blit_own_blt_ring(struct ilo_context *ilo)
-{
-   ilo_cp_set_ring(ilo->cp, ILO_CP_RING_BLT);
-   ilo_cp_set_owner(ilo->cp, NULL, 0);
-}
-
-static void
-gen6_MI_FLUSH_DW(struct ilo_context *ilo)
-{
-   const uint8_t cmd_len = 4;
-   struct ilo_cp *cp = ilo->cp;
-
-   ilo_cp_begin(cp, cmd_len);
-   ilo_cp_write(cp, MI_FLUSH_DW | (cmd_len - 2));
-   ilo_cp_write(cp, 0);
-   ilo_cp_write(cp, 0);
-   ilo_cp_write(cp, 0);
-   ilo_cp_end(cp);
-}
-
-static void
-gen6_MI_LOAD_REGISTER_IMM(struct ilo_context *ilo, uint32_t reg, uint32_t val)
-{
-   const uint8_t cmd_len = 3;
-   struct ilo_cp *cp = ilo->cp;
-
-   ilo_cp_begin(cp, cmd_len);
-   ilo_cp_write(cp, MI_LOAD_REGISTER_IMM | (cmd_len - 2));
-   ilo_cp_write(cp, reg);
-   ilo_cp_write(cp, val);
-   ilo_cp_end(cp);
-}
-
-static void
-gen6_XY_COLOR_BLT(struct ilo_context *ilo, struct intel_bo *dst_bo,
-                  uint32_t dst_offset, int16_t dst_pitch,
-                  enum intel_tiling_mode dst_tiling,
-                  int16_t x1, int16_t y1, int16_t x2, int16_t y2,
-                  uint32_t color,
-                  uint8_t rop, int cpp, bool write_alpha)
-{
-   const uint8_t cmd_len = 6;
-   struct ilo_cp *cp = ilo->cp;
-   int dst_align, dst_pitch_shift;
-   uint32_t dw0, dw1;
-
-   dw0 = XY_COLOR_BLT_CMD | (cmd_len - 2);
-
-   if (dst_tiling == INTEL_TILING_NONE) {
-      dst_align = 4;
-      dst_pitch_shift = 0;
-   }
-   else {
-      dw0 |= XY_DST_TILED;
-
-      dst_align = (dst_tiling == INTEL_TILING_Y) ? 128 : 512;
-      /* in dwords when tiled */
-      dst_pitch_shift = 2;
-   }
-
-   assert(cpp == 4 || cpp == 2 || cpp == 1);
-   assert((x2 - x1) * cpp < gen6_max_bytes_per_scanline);
-   assert(y2 - y1 < gen6_max_scanlines);
-   assert(dst_offset % dst_align == 0 && dst_pitch % dst_align == 0);
-
-   dw1 = rop << 16 |
-         dst_pitch >> dst_pitch_shift;
-
-   switch (cpp) {
-   case 4:
-      dw0 |= XY_BLT_WRITE_RGB;
-      if (write_alpha)
-         dw0 |= XY_BLT_WRITE_ALPHA;
-
-      dw1 |= BR13_8888;
-      break;
-   case 2:
-      dw1 |= BR13_565;
-      break;
-   case 1:
-      dw1 |= BR13_8;
-      break;
-   }
-
-   ilo_cp_begin(cp, cmd_len);
-   ilo_cp_write(cp, dw0);
-   ilo_cp_write(cp, dw1);
-   ilo_cp_write(cp, y1 << 16 | x1);
-   ilo_cp_write(cp, y2 << 16 | x2);
-   ilo_cp_write_bo(cp, dst_offset, dst_bo,
-                   INTEL_DOMAIN_RENDER, INTEL_DOMAIN_RENDER);
-   ilo_cp_write(cp, color);
-   ilo_cp_end(cp);
-}
-
-static void
-gen6_SRC_COPY_BLT(struct ilo_context *ilo, struct intel_bo *dst_bo,
-                  uint32_t dst_offset, int16_t dst_pitch,
-                  uint16_t width, uint16_t height,
-                  struct intel_bo *src_bo,
-                  uint32_t src_offset, int16_t src_pitch,
-                  uint8_t rop, int cpp, bool write_alpha, bool dir_rtl)
-{
-   const uint8_t cmd_len = 6;
-   struct ilo_cp *cp = ilo->cp;
-   uint32_t dw0, dw1;
-
-   assert(cpp == 4 || cpp == 2 || cpp == 1);
-   assert(width < gen6_max_bytes_per_scanline);
-   assert(height < gen6_max_scanlines);
-   /* offsets are naturally aligned and pitches are dword-aligned */
-   assert(dst_offset % cpp == 0 && dst_pitch % 4 == 0);
-   assert(src_offset % cpp == 0 && src_pitch % 4 == 0);
-
-#ifndef SRC_COPY_BLT_CMD
-#define SRC_COPY_BLT_CMD (CMD_2D | (0x43 << 22))
-#endif
-   dw0 = SRC_COPY_BLT_CMD | (cmd_len - 2);
-   dw1 = rop << 16 | dst_pitch;
-
-   if (dir_rtl)
-      dw1 |= 1 << 30;
-
-   switch (cpp) {
-   case 4:
-      dw0 |= XY_BLT_WRITE_RGB;
-      if (write_alpha)
-         dw0 |= XY_BLT_WRITE_ALPHA;
-
-      dw1 |= BR13_8888;
-      break;
-   case 2:
-      dw1 |= BR13_565;
-      break;
-   case 1:
-      dw1 |= BR13_8;
-      break;
-   }
-
-   ilo_cp_begin(cp, cmd_len);
-   ilo_cp_write(cp, dw0);
-   ilo_cp_write(cp, dw1);
-   ilo_cp_write(cp, height << 16 | width);
-   ilo_cp_write_bo(cp, dst_offset, dst_bo, INTEL_DOMAIN_RENDER,
-                                           INTEL_DOMAIN_RENDER);
-   ilo_cp_write(cp, src_pitch);
-   ilo_cp_write_bo(cp, src_offset, src_bo, INTEL_DOMAIN_RENDER, 0);
-   ilo_cp_end(cp);
-}
-
-static void
-gen6_XY_SRC_COPY_BLT(struct ilo_context *ilo, struct intel_bo *dst_bo,
-                     uint32_t dst_offset, int16_t dst_pitch,
-                     enum intel_tiling_mode dst_tiling,
-                     int16_t x1, int16_t y1, int16_t x2, int16_t y2,
-                     struct intel_bo *src_bo,
-                     uint32_t src_offset, int16_t src_pitch,
-                     enum intel_tiling_mode src_tiling,
-                     int16_t src_x, int16_t src_y,
-                     uint8_t rop, int cpp, bool write_alpha)
-{
-   const uint8_t cmd_len = 8;
-   struct ilo_cp *cp = ilo->cp;
-   int dst_align, dst_pitch_shift;
-   int src_align, src_pitch_shift;
-   uint32_t dw0, dw1;
-
-   dw0 = XY_SRC_COPY_BLT_CMD | (cmd_len - 2);
-
-   if (dst_tiling == INTEL_TILING_NONE) {
-      dst_align = 4;
-      dst_pitch_shift = 0;
-   }
-   else {
-      dw0 |= XY_DST_TILED;
-
-      dst_align = (dst_tiling == INTEL_TILING_Y) ? 128 : 512;
-      /* in dwords when tiled */
-      dst_pitch_shift = 2;
-   }
-
-   if (src_tiling == INTEL_TILING_NONE) {
-      src_align = 4;
-      src_pitch_shift = 0;
-   }
-   else {
-      dw0 |= XY_SRC_TILED;
-
-      src_align = (src_tiling == INTEL_TILING_Y) ? 128 : 512;
-      /* in dwords when tiled */
-      src_pitch_shift = 2;
-   }
-
-   assert(cpp == 4 || cpp == 2 || cpp == 1);
-   assert((x2 - x1) * cpp < gen6_max_bytes_per_scanline);
-   assert(y2 - y1 < gen6_max_scanlines);
-   assert(dst_offset % dst_align == 0 && dst_pitch % dst_align == 0);
-   assert(src_offset % src_align == 0 && src_pitch % src_align == 0);
-
-   dw1 = rop << 16 |
-         dst_pitch >> dst_pitch_shift;
-
-   switch (cpp) {
-   case 4:
-      dw0 |= XY_BLT_WRITE_RGB;
-      if (write_alpha)
-         dw0 |= XY_BLT_WRITE_ALPHA;
-
-      dw1 |= BR13_8888;
-      break;
-   case 2:
-      dw1 |= BR13_565;
-      break;
-   case 1:
-      dw1 |= BR13_8;
-      break;
-   }
-
-   ilo_cp_begin(cp, cmd_len);
-   ilo_cp_write(cp, dw0);
-   ilo_cp_write(cp, dw1);
-   ilo_cp_write(cp, y1 << 16 | x1);
-   ilo_cp_write(cp, y2 << 16 | x2);
-   ilo_cp_write_bo(cp, dst_offset, dst_bo, INTEL_DOMAIN_RENDER,
-                                           INTEL_DOMAIN_RENDER);
-   ilo_cp_write(cp, src_y << 16 | src_x);
-   ilo_cp_write(cp, src_pitch >> src_pitch_shift);
-   ilo_cp_write_bo(cp, src_offset, src_bo, INTEL_DOMAIN_RENDER, 0);
-   ilo_cp_end(cp);
-}
-
-static bool
-tex_copy_region(struct ilo_context *ilo,
-                struct ilo_texture *dst,
-                unsigned dst_level,
-                unsigned dst_x, unsigned dst_y, unsigned dst_z,
-                struct ilo_texture *src,
-                unsigned src_level,
-                const struct pipe_box *src_box)
-{
-   const struct util_format_description *desc =
-      util_format_description(dst->bo_format);
-   const unsigned max_extent = 32767; /* INT16_MAX */
-   const uint8_t rop = 0xcc; /* SRCCOPY */
-   struct intel_bo *aper_check[3];
-   uint32_t swctrl;
-   int cpp, xscale, slice;
-
-   /* no W-tiling support */
-   if (dst->separate_s8 || src->separate_s8)
-      return false;
-
-   if (dst->bo_stride > max_extent || src->bo_stride > max_extent)
-      return false;
-
-   cpp = desc->block.bits / 8;
-   xscale = 1;
-
-   /* accommodate for larger cpp */
-   if (cpp > 4) {
-      if (cpp % 2 == 1)
-         return false;
-
-      cpp = (cpp % 4 == 0) ? 4 : 2;
-      xscale = (desc->block.bits / 8) / cpp;
-   }
-
-   ilo_blit_own_blt_ring(ilo);
-
-   /* make room if necessary */
-   aper_check[0] = ilo->cp->bo;
-   aper_check[1] = dst->bo;
-   aper_check[2] = src->bo;
-   if (intel_winsys_check_aperture_space(ilo->winsys, aper_check, 3))
-      ilo_cp_flush(ilo->cp);
-
-   swctrl = 0x0;
-
-   if (dst->tiling == INTEL_TILING_Y) {
-      swctrl |= BCS_SWCTRL_DST_Y << 16 |
-                BCS_SWCTRL_DST_Y;
-   }
-
-   if (src->tiling == INTEL_TILING_Y) {
-      swctrl |= BCS_SWCTRL_SRC_Y << 16 |
-                BCS_SWCTRL_SRC_Y;
-   }
-
-   if (swctrl) {
-      /*
-       * Most clients expect BLT engine to be stateless.  If we have to set
-       * BCS_SWCTRL to a non-default value, we have to set it back in the same
-       * batch buffer.
-       */
-      if (ilo_cp_space(ilo->cp) < (4 + 3) * 2 + src_box->depth * 8)
-         ilo_cp_flush(ilo->cp);
-
-      ilo_cp_assert_no_implicit_flush(ilo->cp, true);
-
-      /*
-       * From the Ivy Bridge PRM, volume 1 part 4, page 133:
-       *
-       *     "SW is required to flush the HW before changing the polarity of
-       *      this bit (Tile Y Destination/Source)."
-       */
-      gen6_MI_FLUSH_DW(ilo);
-      gen6_MI_LOAD_REGISTER_IMM(ilo, BCS_SWCTRL, swctrl);
-
-      swctrl &= ~(BCS_SWCTRL_DST_Y | BCS_SWCTRL_SRC_Y);
-   }
-
-   for (slice = 0; slice < src_box->depth; slice++) {
-      const struct ilo_texture_slice *dst_slice =
-         &dst->slice_offsets[dst_level][dst_z + slice];
-      const struct ilo_texture_slice *src_slice =
-         &src->slice_offsets[src_level][src_box->z + slice];
-      unsigned x1, y1, x2, y2, src_x, src_y;
-
-      x1 = (dst_slice->x + dst_x) * xscale;
-      y1 = dst_slice->y + dst_y;
-      x2 = (x1 + src_box->width) * xscale;
-      y2 = y1 + src_box->height;
-      src_x = (src_slice->x + src_box->x) * xscale;
-      src_y = src_slice->y + src_box->y;
-
-      x1 /= desc->block.width;
-      y1 /= desc->block.height;
-      x2 = (x2 + desc->block.width - 1) / desc->block.width;
-      y2 = (y2 + desc->block.height - 1) / desc->block.height;
-      src_x /= desc->block.width;
-      src_y /= desc->block.height;
-
-      if (x2 > max_extent || y2 > max_extent ||
-          src_x > max_extent || src_y > max_extent ||
-          (x2 - x1) * cpp > gen6_max_bytes_per_scanline)
-         break;
-
-      gen6_XY_SRC_COPY_BLT(ilo,
-            dst->bo, 0, dst->bo_stride, dst->tiling,
-            x1, y1, x2, y2,
-            src->bo, 0, src->bo_stride, src->tiling,
-            src_x, src_y, rop, cpp, true);
-   }
-
-   if (swctrl) {
-      gen6_MI_FLUSH_DW(ilo);
-      gen6_MI_LOAD_REGISTER_IMM(ilo, BCS_SWCTRL, swctrl);
-
-      ilo_cp_assert_no_implicit_flush(ilo->cp, false);
-   }
-
-   return (slice == src_box->depth);
-}
-
-static bool
-buf_copy_region(struct ilo_context *ilo,
-                struct ilo_buffer *dst, unsigned dst_offset,
-                struct ilo_buffer *src, unsigned src_offset,
-                unsigned size)
-{
-   const uint8_t rop = 0xcc; /* SRCCOPY */
-   unsigned offset = 0;
-   struct intel_bo *aper_check[3];
-
-   ilo_blit_own_blt_ring(ilo);
-
-   /* make room if necessary */
-   aper_check[0] = ilo->cp->bo;
-   aper_check[1] = dst->bo;
-   aper_check[2] = src->bo;
-   if (intel_winsys_check_aperture_space(ilo->winsys, aper_check, 3))
-      ilo_cp_flush(ilo->cp);
-
-   while (size) {
-      unsigned width, height;
-      int16_t pitch;
-
-      width = size;
-      height = 1;
-      pitch = 0;
-
-      if (width > gen6_max_bytes_per_scanline) {
-         /* less than INT16_MAX and dword-aligned */
-         pitch = 32764;
-
-         width = pitch;
-         height = size / width;
-         if (height > gen6_max_scanlines)
-            height = gen6_max_scanlines;
-      }
-
-      gen6_SRC_COPY_BLT(ilo,
-            dst->bo, dst_offset + offset, pitch,
-            width, height,
-            src->bo, src_offset + offset, pitch,
-            rop, 1, true, false);
-
-      offset += pitch * height;
-      size -= width * height;
-   }
-
-   return true;
-}
-
 static void
 ilo_resource_copy_region(struct pipe_context *pipe,
                          struct pipe_resource *dst,
@@ -463,72 +44,15 @@ ilo_resource_copy_region(struct pipe_context *pipe,
                          unsigned src_level,
                          const struct pipe_box *src_box)
 {
-   bool success;
-
-   if (dst->target != PIPE_BUFFER && src->target != PIPE_BUFFER) {
-      success = tex_copy_region(ilo_context(pipe),
-            ilo_texture(dst), dst_level, dstx, dsty, dstz,
-            ilo_texture(src), src_level, src_box);
-   }
-   else if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) {
-      const unsigned dst_offset = dstx;
-      const unsigned src_offset = src_box->x;
-      const unsigned size = src_box->width;
-
-      assert(dst_level == 0 && dsty == 0 && dstz == 0);
-      assert(src_level == 0 &&
-             src_box->y == 0 &&
-             src_box->z == 0 &&
-             src_box->height == 1 &&
-             src_box->depth == 1);
-
-      success = buf_copy_region(ilo_context(pipe),
-            ilo_buffer(dst), dst_offset, ilo_buffer(src), src_offset, size);
-   }
-   else {
-      success = false;
-   }
-
-   if (!success) {
-      util_resource_copy_region(pipe, dst, dst_level,
-            dstx, dsty, dstz, src, src_level, src_box);
-   }
-}
-
-static bool
-blitter_xy_color_blt(struct pipe_context *pipe,
-                     struct pipe_resource *res,
-                     int16_t x1, int16_t y1,
-                     int16_t x2, int16_t y2,
-                     uint32_t color)
-{
    struct ilo_context *ilo = ilo_context(pipe);
-   struct ilo_texture *tex = ilo_texture(res);
-   const int cpp = util_format_get_blocksize(tex->bo_format);
-   const uint8_t rop = 0xf0; /* PATCOPY */
-   struct intel_bo *aper_check[2];
-
-   /* how to support Y-tiling? */
-   if (tex->tiling == INTEL_TILING_Y)
-      return false;
 
-   /* nothing to clear */
-   if (x1 >= x2 || y1 >= y2)
-      return true;
-
-   ilo_blit_own_blt_ring(ilo);
-
-   /* make room if necessary */
-   aper_check[0] = ilo->cp->bo;
-   aper_check[1] = tex->bo;
-   if (intel_winsys_check_aperture_space(ilo->winsys, aper_check, 2))
-      ilo_cp_flush(ilo->cp);
-
-   gen6_XY_COLOR_BLT(ilo,
-         tex->bo, 0, tex->bo_stride, tex->tiling,
-         x1, y1, x2, y2, color, rop, cpp, true);
+   if (ilo_blitter_blt_copy_resource(ilo->blitter,
+            dst, dst_level, dstx, dsty, dstz,
+            src, src_level, src_box))
+      return;
 
-   return true;
+   util_resource_copy_region(&ilo->base, dst, dst_level,
+         dstx, dsty, dstz, src, src_level, src_box);
 }
 
 static void
@@ -551,7 +75,6 @@ ilo_clear_render_target(struct pipe_context *pipe,
                         unsigned width, unsigned height)
 {
    struct ilo_context *ilo = ilo_context(pipe);
-   union util_color packed;
 
    if (!width || !height || dstx >= dst->width || dsty >= dst->height)
       return;
@@ -561,13 +84,8 @@ ilo_clear_render_target(struct pipe_context *pipe,
    if (dsty + height > dst->height)
       height = dst->height - dsty;
 
-   util_pack_color(color->f, dst->format, &packed);
-
-   /* try HW blit first */
-   if (blitter_xy_color_blt(pipe, dst->texture,
-                            dstx, dsty,
-                            dstx + width, dsty + height,
-                            packed.ui))
+   if (ilo_blitter_blt_clear_rt(ilo->blitter,
+            dst, color, dstx, dsty, width, height))
       return;
 
    ilo_blitter_pipe_clear_rt(ilo->blitter,
@@ -585,11 +103,17 @@ ilo_clear_depth_stencil(struct pipe_context *pipe,
 {
    struct ilo_context *ilo = ilo_context(pipe);
 
-   /*
-    * The PRM claims that HW blit supports Y-tiling since GEN6, but it does
-    * not tell us how to program it.  Since depth buffers are always Y-tiled,
-    * HW blit will not work.
-    */
+   if (!width || !height || dstx >= dst->width || dsty >= dst->height)
+      return;
+
+   if (dstx + width > dst->width)
+      width = dst->width - dstx;
+   if (dsty + height > dst->height)
+      height = dst->height - dsty;
+
+   if (ilo_blitter_blt_clear_zs(ilo->blitter,
+            dst, clear_flags, depth, stencil, dstx, dsty, width, height))
+      return;
 
    ilo_blitter_pipe_clear_zs(ilo->blitter,
          dst, clear_flags, depth, stencil, dstx, dsty, width, height);
diff --git a/src/gallium/drivers/ilo/ilo_blitter.h b/src/gallium/drivers/ilo/ilo_blitter.h
index 24218f27a62..6a2a0d7022e 100644
--- a/src/gallium/drivers/ilo/ilo_blitter.h
+++ b/src/gallium/drivers/ilo/ilo_blitter.h
@@ -77,4 +77,26 @@ ilo_blitter_pipe_clear_fb(struct ilo_blitter *blitter,
                           const union pipe_color_union *color,
                           double depth, unsigned stencil);
 
+bool
+ilo_blitter_blt_copy_resource(struct ilo_blitter *blitter,
+                              struct pipe_resource *dst, unsigned dst_level,
+                              unsigned dst_x, unsigned dst_y, unsigned dst_z,
+                              struct pipe_resource *src, unsigned src_level,
+                              const struct pipe_box *src_box);
+
+bool
+ilo_blitter_blt_clear_rt(struct ilo_blitter *blitter,
+                         struct pipe_surface *rt,
+                         const union pipe_color_union *color,
+                         unsigned x, unsigned y,
+                         unsigned width, unsigned height);
+
+bool
+ilo_blitter_blt_clear_zs(struct ilo_blitter *blitter,
+                         struct pipe_surface *zs,
+                         unsigned clear_flags,
+                         double depth, unsigned stencil,
+                         unsigned x, unsigned y,
+                         unsigned width, unsigned height);
+
 #endif /* ILO_BLITTER_H */
diff --git a/src/gallium/drivers/ilo/ilo_blitter_blt.c b/src/gallium/drivers/ilo/ilo_blitter_blt.c
new file mode 100644
index 00000000000..55fc68b08c0
--- /dev/null
+++ b/src/gallium/drivers/ilo/ilo_blitter_blt.c
@@ -0,0 +1,805 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 2013 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#include "util/u_pack_color.h"
+#include "intel_reg.h"
+
+#include "ilo_context.h"
+#include "ilo_cp.h"
+#include "ilo_resource.h"
+#include "ilo_blitter.h"
+
+#ifndef COLOR_BLT_CMD
+#define COLOR_BLT_CMD (CMD_2D | (0x40 << 22))
+#endif
+
+#ifndef SRC_COPY_BLT_CMD
+#define SRC_COPY_BLT_CMD (CMD_2D | (0x43 << 22))
+#endif
+
+enum gen6_blt_mask {
+   GEN6_BLT_MASK_8,
+   GEN6_BLT_MASK_16,
+   GEN6_BLT_MASK_32,
+   GEN6_BLT_MASK_32_LO,
+   GEN6_BLT_MASK_32_HI,
+};
+
+/*
+ * From the Sandy Bridge PRM, volume 1 part 5, page 7:
+ *
+ *     "The BLT engine is capable of transferring very large quantities of
+ *      graphics data. Any graphics data read from and written to the
+ *      destination is permitted to represent a number of pixels that occupies
+ *      up to 65,536 scan lines and up to 32,768 bytes per scan line at the
+ *      destination. The maximum number of pixels that may be represented per
+ *      scan line's worth of graphics data depends on the color depth."
+ */
+static const int gen6_max_bytes_per_scanline = 32768;
+static const int gen6_max_scanlines = 65536;
+
+static void
+gen6_emit_MI_FLUSH_DW(struct ilo_dev_info *dev, struct ilo_cp *cp)
+{
+   const uint8_t cmd_len = 4;
+
+   ilo_cp_begin(cp, cmd_len);
+   ilo_cp_write(cp, MI_FLUSH_DW | (cmd_len - 2));
+   ilo_cp_write(cp, 0);
+   ilo_cp_write(cp, 0);
+   ilo_cp_write(cp, 0);
+   ilo_cp_end(cp);
+}
+
+static void
+gen6_emit_MI_LOAD_REGISTER_IMM(struct ilo_dev_info *dev,
+                               uint32_t reg, uint32_t val,
+                               struct ilo_cp *cp)
+{
+   const uint8_t cmd_len = 3;
+
+   ilo_cp_begin(cp, cmd_len);
+   ilo_cp_write(cp, MI_LOAD_REGISTER_IMM | (cmd_len - 2));
+   ilo_cp_write(cp, reg);
+   ilo_cp_write(cp, val);
+   ilo_cp_end(cp);
+}
+
+static uint32_t
+gen6_translate_blt_value_mask(enum gen6_blt_mask value_mask)
+{
+   switch (value_mask) {
+   case GEN6_BLT_MASK_8:  return BR13_8;
+   case GEN6_BLT_MASK_16: return BR13_565;
+   default:               return BR13_8888;
+   }
+}
+
+static uint32_t
+gen6_translate_blt_write_mask(enum gen6_blt_mask write_mask)
+{
+   switch (write_mask) {
+   case GEN6_BLT_MASK_32:    return XY_BLT_WRITE_RGB |
+                                    XY_BLT_WRITE_ALPHA;
+   case GEN6_BLT_MASK_32_LO: return XY_BLT_WRITE_RGB;
+   case GEN6_BLT_MASK_32_HI: return XY_BLT_WRITE_ALPHA;
+   default:                  return 0;
+   }
+}
+
+static uint32_t
+gen6_translate_blt_cpp(enum gen6_blt_mask mask)
+{
+   switch (mask) {
+   case GEN6_BLT_MASK_8:  return 1;
+   case GEN6_BLT_MASK_16: return 2;
+   default:               return 4;
+   }
+}
+
+static void
+gen6_emit_COLOR_BLT(struct ilo_dev_info *dev,
+                    struct intel_bo *dst_bo,
+                    int16_t dst_pitch, uint32_t dst_offset,
+                    uint16_t width, uint16_t height,
+                    uint32_t pattern, uint8_t rop,
+                    enum gen6_blt_mask value_mask,
+                    enum gen6_blt_mask write_mask,
+                    struct ilo_cp *cp)
+{
+   const uint8_t cmd_len = 5;
+   const int cpp = gen6_translate_blt_cpp(value_mask);
+   uint32_t dw0, dw1;
+
+   dw0 = COLOR_BLT_CMD |
+         gen6_translate_blt_write_mask(write_mask) |
+         (cmd_len - 2);
+
+   assert(width < gen6_max_bytes_per_scanline);
+   assert(height < gen6_max_scanlines);
+   /* offsets are naturally aligned and pitches are dword-aligned */
+   assert(dst_offset % cpp == 0 && dst_pitch % 4 == 0);
+
+   dw1 = rop << 16 |
+         gen6_translate_blt_value_mask(value_mask) |
+         dst_pitch;
+
+   ilo_cp_begin(cp, cmd_len);
+   ilo_cp_write(cp, dw0);
+   ilo_cp_write(cp, dw1);
+   ilo_cp_write(cp, height << 16 | width);
+   ilo_cp_write_bo(cp, dst_offset, dst_bo, INTEL_DOMAIN_RENDER,
+                                           INTEL_DOMAIN_RENDER);
+   ilo_cp_write(cp, pattern);
+   ilo_cp_end(cp);
+}
+
+static void
+gen6_emit_XY_COLOR_BLT(struct ilo_dev_info *dev,
+                       struct intel_bo *dst_bo,
+                       enum intel_tiling_mode dst_tiling,
+                       int16_t dst_pitch, uint32_t dst_offset,
+                       int16_t x1, int16_t y1, int16_t x2, int16_t y2,
+                       uint32_t pattern, uint8_t rop,
+                       enum gen6_blt_mask value_mask,
+                       enum gen6_blt_mask write_mask,
+                       struct ilo_cp *cp)
+{
+   const uint8_t cmd_len = 6;
+   const int cpp = gen6_translate_blt_cpp(value_mask);
+   int dst_align, dst_pitch_shift;
+   uint32_t dw0, dw1;
+
+   dw0 = XY_COLOR_BLT_CMD |
+         gen6_translate_blt_write_mask(write_mask) |
+         (cmd_len - 2);
+
+   if (dst_tiling == INTEL_TILING_NONE) {
+      dst_align = 4;
+      dst_pitch_shift = 0;
+   }
+   else {
+      dw0 |= XY_DST_TILED;
+
+      dst_align = (dst_tiling == INTEL_TILING_Y) ? 128 : 512;
+      /* in dwords when tiled */
+      dst_pitch_shift = 2;
+   }
+
+   assert((x2 - x1) * cpp < gen6_max_bytes_per_scanline);
+   assert(y2 - y1 < gen6_max_scanlines);
+   assert(dst_offset % dst_align == 0 && dst_pitch % dst_align == 0);
+
+   dw1 = rop << 16 |
+         gen6_translate_blt_value_mask(value_mask) |
+         dst_pitch >> dst_pitch_shift;
+
+   ilo_cp_begin(cp, cmd_len);
+   ilo_cp_write(cp, dw0);
+   ilo_cp_write(cp, dw1);
+   ilo_cp_write(cp, y1 << 16 | x1);
+   ilo_cp_write(cp, y2 << 16 | x2);
+   ilo_cp_write_bo(cp, dst_offset, dst_bo,
+                   INTEL_DOMAIN_RENDER, INTEL_DOMAIN_RENDER);
+   ilo_cp_write(cp, pattern);
+   ilo_cp_end(cp);
+}
+
+static void
+gen6_emit_SRC_COPY_BLT(struct ilo_dev_info *dev,
+                       struct intel_bo *dst_bo,
+                       int16_t dst_pitch, uint32_t dst_offset,
+                       uint16_t width, uint16_t height,
+                       struct intel_bo *src_bo,
+                       int16_t src_pitch, uint32_t src_offset,
+                       bool dir_rtl, uint8_t rop,
+                       enum gen6_blt_mask value_mask,
+                       enum gen6_blt_mask write_mask,
+                       struct ilo_cp *cp)
+{
+   const uint8_t cmd_len = 6;
+   const int cpp = gen6_translate_blt_cpp(value_mask);
+   uint32_t dw0, dw1;
+
+   dw0 = SRC_COPY_BLT_CMD |
+         gen6_translate_blt_write_mask(write_mask) |
+         (cmd_len - 2);
+
+   assert(width < gen6_max_bytes_per_scanline);
+   assert(height < gen6_max_scanlines);
+   /* offsets are naturally aligned and pitches are dword-aligned */
+   assert(dst_offset % cpp == 0 && dst_pitch % 4 == 0);
+   assert(src_offset % cpp == 0 && src_pitch % 4 == 0);
+
+   dw1 = rop << 16 |
+         gen6_translate_blt_value_mask(value_mask) |
+         dst_pitch;
+
+   if (dir_rtl)
+      dw1 |= 1 << 30;
+
+   ilo_cp_begin(cp, cmd_len);
+   ilo_cp_write(cp, dw0);
+   ilo_cp_write(cp, dw1);
+   ilo_cp_write(cp, height << 16 | width);
+   ilo_cp_write_bo(cp, dst_offset, dst_bo, INTEL_DOMAIN_RENDER,
+                                           INTEL_DOMAIN_RENDER);
+   ilo_cp_write(cp, src_pitch);
+   ilo_cp_write_bo(cp, src_offset, src_bo, INTEL_DOMAIN_RENDER, 0);
+   ilo_cp_end(cp);
+}
+
+static void
+gen6_emit_XY_SRC_COPY_BLT(struct ilo_dev_info *dev,
+                          struct intel_bo *dst_bo,
+                          enum intel_tiling_mode dst_tiling,
+                          int16_t dst_pitch, uint32_t dst_offset,
+                          int16_t x1, int16_t y1, int16_t x2, int16_t y2,
+                          struct intel_bo *src_bo,
+                          enum intel_tiling_mode src_tiling,
+                          int16_t src_pitch, uint32_t src_offset,
+                          int16_t src_x, int16_t src_y, uint8_t rop,
+                          enum gen6_blt_mask value_mask,
+                          enum gen6_blt_mask write_mask,
+                          struct ilo_cp *cp)
+{
+   const uint8_t cmd_len = 8;
+   const int cpp = gen6_translate_blt_cpp(value_mask);
+   int dst_align, dst_pitch_shift;
+   int src_align, src_pitch_shift;
+   uint32_t dw0, dw1;
+
+   dw0 = XY_SRC_COPY_BLT_CMD |
+         gen6_translate_blt_write_mask(write_mask) |
+         (cmd_len - 2);
+
+   if (dst_tiling == INTEL_TILING_NONE) {
+      dst_align = 4;
+      dst_pitch_shift = 0;
+   }
+   else {
+      dw0 |= XY_DST_TILED;
+
+      dst_align = (dst_tiling == INTEL_TILING_Y) ? 128 : 512;
+      /* in dwords when tiled */
+      dst_pitch_shift = 2;
+   }
+
+   if (src_tiling == INTEL_TILING_NONE) {
+      src_align = 4;
+      src_pitch_shift = 0;
+   }
+   else {
+      dw0 |= XY_SRC_TILED;
+
+      src_align = (src_tiling == INTEL_TILING_Y) ? 128 : 512;
+      /* in dwords when tiled */
+      src_pitch_shift = 2;
+   }
+
+   assert((x2 - x1) * cpp < gen6_max_bytes_per_scanline);
+   assert(y2 - y1 < gen6_max_scanlines);
+   assert(dst_offset % dst_align == 0 && dst_pitch % dst_align == 0);
+   assert(src_offset % src_align == 0 && src_pitch % src_align == 0);
+
+   dw1 = rop << 16 |
+         gen6_translate_blt_value_mask(value_mask) |
+         dst_pitch >> dst_pitch_shift;
+
+   ilo_cp_begin(cp, cmd_len);
+   ilo_cp_write(cp, dw0);
+   ilo_cp_write(cp, dw1);
+   ilo_cp_write(cp, y1 << 16 | x1);
+   ilo_cp_write(cp, y2 << 16 | x2);
+   ilo_cp_write_bo(cp, dst_offset, dst_bo, INTEL_DOMAIN_RENDER,
+                                           INTEL_DOMAIN_RENDER);
+   ilo_cp_write(cp, src_y << 16 | src_x);
+   ilo_cp_write(cp, src_pitch >> src_pitch_shift);
+   ilo_cp_write_bo(cp, src_offset, src_bo, INTEL_DOMAIN_RENDER, 0);
+   ilo_cp_end(cp);
+}
+
+static uint32_t
+ilo_blitter_blt_begin(struct ilo_blitter *blitter, int max_cmd_size,
+                      struct intel_bo *dst, enum intel_tiling_mode dst_tiling,
+                      struct intel_bo *src, enum intel_tiling_mode src_tiling)
+{
+   struct ilo_context *ilo = blitter->ilo;
+   struct intel_bo *aper_check[3];
+   int count;
+   uint32_t swctrl;
+
+   /* change ring */
+   ilo_cp_set_ring(ilo->cp, ILO_CP_RING_BLT);
+   ilo_cp_set_owner(ilo->cp, NULL, 0);
+
+   /* check aperture space */
+   aper_check[0] = ilo->cp->bo;
+   aper_check[1] = dst;
+   count = 2;
+
+   if (src) {
+      aper_check[2] = src;
+      count++;
+   }
+
+   if (intel_winsys_check_aperture_space(ilo->winsys, aper_check, count))
+      ilo_cp_flush(ilo->cp);
+
+   /* set BCS_SWCTRL */
+   swctrl = 0x0;
+
+   if (dst_tiling == INTEL_TILING_Y) {
+      swctrl |= BCS_SWCTRL_DST_Y << 16 |
+                BCS_SWCTRL_DST_Y;
+   }
+
+   if (src && src_tiling == INTEL_TILING_Y) {
+      swctrl |= BCS_SWCTRL_SRC_Y << 16 |
+                BCS_SWCTRL_SRC_Y;
+   }
+
+   if (swctrl) {
+      /*
+       * Most clients expect BLT engine to be stateless.  If we have to set
+       * BCS_SWCTRL to a non-default value, we have to set it back in the same
+       * batch buffer.
+       */
+      if (ilo_cp_space(ilo->cp) < (4 + 3) * 2 + max_cmd_size)
+         ilo_cp_flush(ilo->cp);
+
+      ilo_cp_assert_no_implicit_flush(ilo->cp, true);
+
+      /*
+       * From the Ivy Bridge PRM, volume 1 part 4, page 133:
+       *
+       *     "SW is required to flush the HW before changing the polarity of
+       *      this bit (Tile Y Destination/Source)."
+       */
+      gen6_emit_MI_FLUSH_DW(ilo->dev, ilo->cp);
+      gen6_emit_MI_LOAD_REGISTER_IMM(ilo->dev, BCS_SWCTRL, swctrl, ilo->cp);
+
+      swctrl &= ~(BCS_SWCTRL_DST_Y | BCS_SWCTRL_SRC_Y);
+   }
+
+   return swctrl;
+}
+
+static void
+ilo_blitter_blt_end(struct ilo_blitter *blitter, uint32_t swctrl)
+{
+   struct ilo_context *ilo = blitter->ilo;
+
+   /* set BCS_SWCTRL back */
+   if (swctrl) {
+      gen6_emit_MI_FLUSH_DW(ilo->dev, ilo->cp);
+      gen6_emit_MI_LOAD_REGISTER_IMM(ilo->dev, BCS_SWCTRL, swctrl, ilo->cp);
+
+      ilo_cp_assert_no_implicit_flush(ilo->cp, false);
+   }
+}
+
+static bool
+buf_clear_region(struct ilo_blitter *blitter,
+                 struct ilo_buffer *dst,
+                 unsigned dst_offset, unsigned dst_size,
+                 uint32_t val,
+                 enum gen6_blt_mask value_mask,
+                 enum gen6_blt_mask write_mask)
+{
+   const uint8_t rop = 0xf0; /* PATCOPY */
+   const int cpp = gen6_translate_blt_cpp(value_mask);
+   struct ilo_context *ilo = blitter->ilo;
+   unsigned offset = 0;
+
+   if (dst_offset % cpp || dst_size % cpp)
+      return false;
+
+   ilo_blitter_blt_begin(blitter, 0,
+         dst->bo, INTEL_TILING_NONE, NULL, INTEL_TILING_NONE);
+
+   while (dst_size) {
+      unsigned width, height;
+      int16_t pitch;
+
+      width = dst_size;
+      height = 1;
+      pitch = 0;
+
+      if (width > gen6_max_bytes_per_scanline) {
+         /* less than INT16_MAX and dword-aligned */
+         pitch = 32764;
+
+         width = pitch;
+         height = dst_size / width;
+         if (height > gen6_max_scanlines)
+            height = gen6_max_scanlines;
+      }
+
+      gen6_emit_COLOR_BLT(ilo->dev, dst->bo, pitch, dst_offset + offset,
+            width, height, val, rop, value_mask, write_mask, ilo->cp);
+
+      offset += pitch * height;
+      dst_size -= width * height;
+   }
+
+   ilo_blitter_blt_end(blitter, 0);
+
+   return true;
+}
+
+static bool
+buf_copy_region(struct ilo_blitter *blitter,
+                struct ilo_buffer *dst, unsigned dst_offset,
+                struct ilo_buffer *src, unsigned src_offset,
+                unsigned size)
+{
+   const uint8_t rop = 0xcc; /* SRCCOPY */
+   struct ilo_context *ilo = blitter->ilo;
+   unsigned offset = 0;
+
+   ilo_blitter_blt_begin(blitter, 0,
+         dst->bo, INTEL_TILING_NONE, src->bo, INTEL_TILING_NONE);
+
+   while (size) {
+      unsigned width, height;
+      int16_t pitch;
+
+      width = size;
+      height = 1;
+      pitch = 0;
+
+      if (width > gen6_max_bytes_per_scanline) {
+         /* less than INT16_MAX and dword-aligned */
+         pitch = 32764;
+
+         width = pitch;
+         height = size / width;
+         if (height > gen6_max_scanlines)
+            height = gen6_max_scanlines;
+      }
+
+      gen6_emit_SRC_COPY_BLT(ilo->dev,
+            dst->bo, pitch, dst_offset + offset,
+            width, height,
+            src->bo, pitch, src_offset + offset,
+            false, rop, GEN6_BLT_MASK_8, GEN6_BLT_MASK_8,
+            ilo->cp);
+
+      offset += pitch * height;
+      size -= width * height;
+   }
+
+   ilo_blitter_blt_end(blitter, 0);
+
+   return true;
+}
+
+static bool
+tex_clear_region(struct ilo_blitter *blitter,
+                 struct ilo_texture *dst, unsigned dst_level,
+                 const struct pipe_box *dst_box,
+                 uint32_t val,
+                 enum gen6_blt_mask value_mask,
+                 enum gen6_blt_mask write_mask)
+{
+   const int cpp = gen6_translate_blt_cpp(value_mask);
+   const unsigned max_extent = 32767; /* INT16_MAX */
+   const uint8_t rop = 0xf0; /* PATCOPY */
+   struct ilo_context *ilo = blitter->ilo;
+   uint32_t swctrl;
+   int slice;
+
+   /* no W-tiling support */
+   if (dst->separate_s8)
+      return false;
+
+   if (dst->bo_stride > max_extent)
+      return false;
+
+   swctrl = ilo_blitter_blt_begin(blitter, dst_box->depth * 6,
+         dst->bo, dst->tiling, NULL, INTEL_TILING_NONE);
+
+   for (slice = 0; slice < dst_box->depth; slice++) {
+      const struct ilo_texture_slice *dst_slice =
+         &dst->slice_offsets[dst_level][dst_box->z + slice];
+      unsigned x1, y1, x2, y2;
+
+      x1 = dst_slice->x + dst_box->x;
+      y1 = dst_slice->y + dst_box->y;
+      x2 = x1 + dst_box->width;
+      y2 = y1 + dst_box->height;
+
+      if (x2 > max_extent || y2 > max_extent ||
+          (x2 - x1) * cpp > gen6_max_bytes_per_scanline)
+         break;
+
+      gen6_emit_XY_COLOR_BLT(ilo->dev,
+            dst->bo, dst->tiling, dst->bo_stride, 0,
+            x1, y1, x2, y2, val, rop, value_mask, write_mask,
+            ilo->cp);
+   }
+
+   ilo_blitter_blt_end(blitter, swctrl);
+
+   return (slice == dst_box->depth);
+}
+
+static bool
+tex_copy_region(struct ilo_blitter *blitter,
+                struct ilo_texture *dst,
+                unsigned dst_level,
+                unsigned dst_x, unsigned dst_y, unsigned dst_z,
+                struct ilo_texture *src,
+                unsigned src_level,
+                const struct pipe_box *src_box)
+{
+   const struct util_format_description *desc =
+      util_format_description(dst->bo_format);
+   const unsigned max_extent = 32767; /* INT16_MAX */
+   const uint8_t rop = 0xcc; /* SRCCOPY */
+   struct ilo_context *ilo = blitter->ilo;
+   enum gen6_blt_mask mask;
+   uint32_t swctrl;
+   int cpp, xscale, slice;
+
+   /* no W-tiling support */
+   if (dst->separate_s8 || src->separate_s8)
+      return false;
+
+   if (dst->bo_stride > max_extent || src->bo_stride > max_extent)
+      return false;
+
+   cpp = desc->block.bits / 8;
+   xscale = 1;
+
+   /* accommodate for larger cpp */
+   if (cpp > 4) {
+      if (cpp % 2 == 1)
+         return false;
+
+      cpp = (cpp % 4 == 0) ? 4 : 2;
+      xscale = (desc->block.bits / 8) / cpp;
+   }
+
+   switch (cpp) {
+   case 1:
+      mask = GEN6_BLT_MASK_8;
+      break;
+   case 2:
+      mask = GEN6_BLT_MASK_16;
+      break;
+   case 4:
+      mask = GEN6_BLT_MASK_32;
+      break;
+   default:
+      return false;
+      break;
+   }
+
+   swctrl = ilo_blitter_blt_begin(blitter, src_box->depth * 8,
+         dst->bo, dst->tiling, src->bo, src->tiling);
+
+   for (slice = 0; slice < src_box->depth; slice++) {
+      const struct ilo_texture_slice *dst_slice =
+         &dst->slice_offsets[dst_level][dst_z + slice];
+      const struct ilo_texture_slice *src_slice =
+         &src->slice_offsets[src_level][src_box->z + slice];
+      unsigned x1, y1, x2, y2, src_x, src_y;
+
+      x1 = (dst_slice->x + dst_x) * xscale;
+      y1 = dst_slice->y + dst_y;
+      x2 = (x1 + src_box->width) * xscale;
+      y2 = y1 + src_box->height;
+      src_x = (src_slice->x + src_box->x) * xscale;
+      src_y = src_slice->y + src_box->y;
+
+      /* in blocks */
+      x1 /= desc->block.width;
+      y1 /= desc->block.height;
+      x2 = (x2 + desc->block.width - 1) / desc->block.width;
+      y2 = (y2 + desc->block.height - 1) / desc->block.height;
+      src_x /= desc->block.width;
+      src_y /= desc->block.height;
+
+      if (x2 > max_extent || y2 > max_extent ||
+          src_x > max_extent || src_y > max_extent ||
+          (x2 - x1) * cpp > gen6_max_bytes_per_scanline)
+         break;
+
+      gen6_emit_XY_SRC_COPY_BLT(ilo->dev,
+            dst->bo, dst->tiling, dst->bo_stride, 0,
+            x1, y1, x2, y2,
+            src->bo, src->tiling, src->bo_stride, 0,
+            src_x, src_y, rop, mask, mask,
+            ilo->cp);
+   }
+
+   ilo_blitter_blt_end(blitter, swctrl);
+
+   return (slice == src_box->depth);
+}
+
+bool
+ilo_blitter_blt_copy_resource(struct ilo_blitter *blitter,
+                              struct pipe_resource *dst, unsigned dst_level,
+                              unsigned dst_x, unsigned dst_y, unsigned dst_z,
+                              struct pipe_resource *src, unsigned src_level,
+                              const struct pipe_box *src_box)
+{
+   bool success;
+
+   if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) {
+      const unsigned dst_offset = dst_x;
+      const unsigned src_offset = src_box->x;
+      const unsigned size = src_box->width;
+
+      assert(dst_level == 0 && dst_y == 0 && dst_z == 0);
+      assert(src_level == 0 &&
+             src_box->y == 0 &&
+             src_box->z == 0 &&
+             src_box->height == 1 &&
+             src_box->depth == 1);
+
+      success = buf_copy_region(blitter,
+            ilo_buffer(dst), dst_offset, ilo_buffer(src), src_offset, size);
+   }
+   else if (dst->target != PIPE_BUFFER && src->target != PIPE_BUFFER) {
+      success = tex_copy_region(blitter,
+            ilo_texture(dst), dst_level, dst_x, dst_y, dst_z,
+            ilo_texture(src), src_level, src_box);
+   }
+   else {
+      success = false;
+   }
+
+   return success;
+}
+
+bool
+ilo_blitter_blt_clear_rt(struct ilo_blitter *blitter,
+                         struct pipe_surface *rt,
+                         const union pipe_color_union *color,
+                         unsigned x, unsigned y,
+                         unsigned width, unsigned height)
+{
+   const int cpp = util_format_get_blocksize(rt->format);
+   enum gen6_blt_mask mask;
+   union util_color packed;
+   bool success;
+
+   switch (cpp) {
+   case 1:
+      mask = GEN6_BLT_MASK_8;
+      break;
+   case 2:
+      mask = GEN6_BLT_MASK_16;
+      break;
+   case 4:
+      mask = GEN6_BLT_MASK_32;
+      break;
+   default:
+      return false;
+      break;
+   }
+
+   if (util_format_is_pure_integer(rt->format) ||
+       util_format_is_compressed(rt->format))
+      return false;
+
+   util_pack_color(color->f, rt->format, &packed);
+
+   if (rt->texture->target == PIPE_BUFFER) {
+      unsigned offset, end, size;
+
+      assert(y == 0 && height == 1);
+
+      offset = (rt->u.buf.first_element + x) * cpp;
+      end = (rt->u.buf.last_element + 1) * cpp;
+
+      size = width * cpp;
+      if (offset + size > end)
+         size = end - offset;
+
+      success = buf_clear_region(blitter, ilo_buffer(rt->texture),
+            offset, size, packed.ui, mask, mask);
+   }
+   else {
+      struct pipe_box box;
+
+      u_box_3d(x, y, rt->u.tex.first_layer, width, height,
+            rt->u.tex.last_layer - rt->u.tex.first_layer + 1, &box);
+
+      success = tex_clear_region(blitter, ilo_texture(rt->texture),
+            rt->u.tex.level, &box, packed.ui, mask, mask);
+   }
+
+   return success;
+}
+
+bool
+ilo_blitter_blt_clear_zs(struct ilo_blitter *blitter,
+                         struct pipe_surface *zs,
+                         unsigned clear_flags,
+                         double depth, unsigned stencil,
+                         unsigned x, unsigned y,
+                         unsigned width, unsigned height)
+{
+   enum gen6_blt_mask value_mask, write_mask;
+   struct pipe_box box;
+   uint32_t val;
+
+   switch (zs->format) {
+   case PIPE_FORMAT_Z16_UNORM:
+      if (!(clear_flags & PIPE_CLEAR_DEPTH))
+         return true;
+
+      value_mask = GEN6_BLT_MASK_16;
+      write_mask = GEN6_BLT_MASK_16;
+      break;
+   case PIPE_FORMAT_Z32_FLOAT:
+      if (!(clear_flags & PIPE_CLEAR_DEPTH))
+         return true;
+
+      value_mask = GEN6_BLT_MASK_32;
+      write_mask = GEN6_BLT_MASK_32;
+      break;
+   case PIPE_FORMAT_Z24X8_UNORM:
+      if (!(clear_flags & PIPE_CLEAR_DEPTH))
+         return true;
+
+      value_mask = GEN6_BLT_MASK_32;
+      write_mask = GEN6_BLT_MASK_32_LO;
+      break;
+   case PIPE_FORMAT_Z24_UNORM_S8_UINT:
+      if (!(clear_flags & PIPE_CLEAR_DEPTHSTENCIL))
+         return true;
+
+      value_mask = GEN6_BLT_MASK_32;
+
+      if ((clear_flags & PIPE_CLEAR_DEPTHSTENCIL) == PIPE_CLEAR_DEPTHSTENCIL)
+         write_mask = GEN6_BLT_MASK_32;
+      else if (clear_flags & PIPE_CLEAR_DEPTH)
+         write_mask = GEN6_BLT_MASK_32_LO;
+      else
+         write_mask = GEN6_BLT_MASK_32_HI;
+      break;
+   default:
+      return false;
+      break;
+   }
+
+   val = util_pack_z_stencil(zs->format, depth, stencil);
+
+   u_box_3d(x, y, zs->u.tex.first_layer, width, height,
+         zs->u.tex.last_layer - zs->u.tex.first_layer + 1, &box);
+
+   assert(zs->texture->target != PIPE_BUFFER);
+
+   return tex_clear_region(blitter, ilo_texture(zs->texture),
+         zs->u.tex.level, &box, val, value_mask, write_mask);
+}