drivers/radeonsi/si_compute_blit.c

/*
 * Copyright 2018 Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * 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
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, 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 (including the next
 * paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
 *
 */

#include "si_pipe.h"
#include "util/format/u_format.h"
#include "util/format_srgb.h"
#include "util/u_helpers.h"

/* Determine the cache policy. */
static enum si_cache_policy get_cache_policy(struct si_context *sctx, enum si_coherency coher,
                                             uint64_t size)
{
   if ((sctx->chip_class >= GFX9 && (coher == SI_COHERENCY_CB_META ||
                                     coher == SI_COHERENCY_DB_META ||
                                     coher == SI_COHERENCY_CP)) ||
       (sctx->chip_class >= GFX7 && coher == SI_COHERENCY_SHADER))
      return L2_LRU; /* it's faster if L2 doesn't evict anything  */

   return L2_BYPASS;
}

unsigned si_get_flush_flags(struct si_context *sctx, enum si_coherency coher,
                            enum si_cache_policy cache_policy)
{
   switch (coher) {
   default:
   case SI_COHERENCY_NONE:
   case SI_COHERENCY_CP:
      return 0;
   case SI_COHERENCY_SHADER:
      return SI_CONTEXT_INV_SCACHE | SI_CONTEXT_INV_VCACHE |
             (cache_policy == L2_BYPASS ? SI_CONTEXT_INV_L2 : 0);
   case SI_COHERENCY_CB_META:
      return SI_CONTEXT_FLUSH_AND_INV_CB;
   case SI_COHERENCY_DB_META:
      return SI_CONTEXT_FLUSH_AND_INV_DB;
   }
}

static bool si_is_buffer_idle(struct si_context *sctx, struct si_resource *buf,
                              unsigned usage)
{
   return !si_cs_is_buffer_referenced(sctx, buf->buf, usage) &&
          sctx->ws->buffer_wait(sctx->ws, buf->buf, 0, usage);
}

static void si_improve_sync_flags(struct si_context *sctx, struct pipe_resource *dst,
                                  struct pipe_resource *src, unsigned *flags)
{
   if (dst->target != PIPE_BUFFER || (src && src->target != PIPE_BUFFER))
      return;

   if (si_is_buffer_idle(sctx, si_resource(dst), RADEON_USAGE_READWRITE) &&
       (!src || si_is_buffer_idle(sctx, si_resource(src), RADEON_USAGE_WRITE))) {
      /* Idle buffers don't have to sync. */
      *flags &= ~(SI_OP_SYNC_GE_BEFORE | SI_OP_SYNC_PS_BEFORE | SI_OP_SYNC_CS_BEFORE |
                  SI_OP_SYNC_CPDMA_BEFORE);
      return;
   }

   const unsigned cs_mask = SI_BIND_CONSTANT_BUFFER(PIPE_SHADER_COMPUTE) |
                            SI_BIND_SHADER_BUFFER(PIPE_SHADER_COMPUTE) |
                            SI_BIND_IMAGE_BUFFER(PIPE_SHADER_COMPUTE) |
                            SI_BIND_SAMPLER_BUFFER(PIPE_SHADER_COMPUTE);

   const unsigned ps_mask = SI_BIND_CONSTANT_BUFFER(PIPE_SHADER_FRAGMENT) |
                            SI_BIND_SHADER_BUFFER(PIPE_SHADER_FRAGMENT) |
                            SI_BIND_IMAGE_BUFFER(PIPE_SHADER_FRAGMENT) |
                            SI_BIND_SAMPLER_BUFFER(PIPE_SHADER_FRAGMENT);

   unsigned bind_history = si_resource(dst)->bind_history |
                           (src ? si_resource(src)->bind_history : 0);

   /* Clear SI_OP_SYNC_CS_BEFORE if the buffer has never been used with a CS. */
   if (*flags & SI_OP_SYNC_CS_BEFORE && !(bind_history & cs_mask))
      *flags &= ~SI_OP_SYNC_CS_BEFORE;

   /* Clear SI_OP_SYNC_PS_BEFORE if the buffer has never been used with a PS. */
   if (*flags & SI_OP_SYNC_PS_BEFORE && !(bind_history & ps_mask)) {
      *flags &= ~SI_OP_SYNC_PS_BEFORE;
      *flags |= SI_OP_SYNC_GE_BEFORE;
   }
}

void si_launch_grid_internal(struct si_context *sctx, struct pipe_grid_info *info,
                             void *shader, unsigned flags)
{
   /* Wait for previous shaders to finish. */
   if (flags & SI_OP_SYNC_GE_BEFORE)
      sctx->flags |= SI_CONTEXT_VS_PARTIAL_FLUSH;

   if (flags & SI_OP_SYNC_PS_BEFORE)
      sctx->flags |= SI_CONTEXT_PS_PARTIAL_FLUSH;

   if (flags & SI_OP_SYNC_CS_BEFORE)
      sctx->flags |= SI_CONTEXT_CS_PARTIAL_FLUSH;

   if (!(flags & SI_OP_CS_IMAGE))
      sctx->flags |= SI_CONTEXT_PFP_SYNC_ME;

   /* Invalidate L0-L1 caches. */
   /* sL0 is never invalidated, because src resources don't use it. */
   if (!(flags & SI_OP_SKIP_CACHE_INV_BEFORE))
      sctx->flags |= SI_CONTEXT_INV_VCACHE;

   /* Set settings for driver-internal compute dispatches. */
   sctx->flags &= ~SI_CONTEXT_START_PIPELINE_STATS;
   sctx->flags |= SI_CONTEXT_STOP_PIPELINE_STATS;

   if (!(flags & SI_OP_CS_RENDER_COND_ENABLE))
      sctx->render_cond_enabled = false;

   /* Skip decompression to prevent infinite recursion. */
   sctx->blitter_running = true;

   /* Dispatch compute. */
   void *saved_cs = sctx->cs_shader_state.program;
   sctx->b.bind_compute_state(&sctx->b, shader);
   sctx->b.launch_grid(&sctx->b, info);
   sctx->b.bind_compute_state(&sctx->b, saved_cs);

   /* Restore default settings. */
   sctx->flags &= ~SI_CONTEXT_STOP_PIPELINE_STATS;
   sctx->flags |= SI_CONTEXT_START_PIPELINE_STATS;
   sctx->render_cond_enabled = sctx->render_cond;
   sctx->blitter_running = false;

   if (flags & SI_OP_SYNC_AFTER) {
      sctx->flags |= SI_CONTEXT_CS_PARTIAL_FLUSH;

      if (flags & SI_OP_CS_IMAGE) {
         /* Make sure image stores are visible to CB, which doesn't use L2 on GFX6-8. */
         sctx->flags |= sctx->chip_class <= GFX8 ? SI_CONTEXT_WB_L2 : 0;
         /* Make sure image stores are visible to all CUs. */
         sctx->flags |= SI_CONTEXT_INV_VCACHE;
      } else {
         /* Make sure buffer stores are visible to all CUs. */
         sctx->flags |= SI_CONTEXT_INV_SCACHE | SI_CONTEXT_INV_VCACHE | SI_CONTEXT_PFP_SYNC_ME;
      }
   }
}

void si_launch_grid_internal_ssbos(struct si_context *sctx, struct pipe_grid_info *info,
                                   void *shader, unsigned flags, enum si_coherency coher,
                                   unsigned num_buffers, const struct pipe_shader_buffer *buffers,
                                   unsigned writeable_bitmask)
{
   if (!(flags & SI_OP_SKIP_CACHE_INV_BEFORE))
      sctx->flags |= si_get_flush_flags(sctx, coher, SI_COMPUTE_DST_CACHE_POLICY);

   /* Save states. */
   struct pipe_shader_buffer saved_sb[3] = {};
   assert(num_buffers <= ARRAY_SIZE(saved_sb));
   si_get_shader_buffers(sctx, PIPE_SHADER_COMPUTE, 0, num_buffers, saved_sb);

   unsigned saved_writable_mask = 0;
   for (unsigned i = 0; i < num_buffers; i++) {
      if (sctx->const_and_shader_buffers[PIPE_SHADER_COMPUTE].writable_mask &
          (1u << si_get_shaderbuf_slot(i)))
         saved_writable_mask |= 1 << i;
   }

   /* Bind buffers and launch compute. */
   si_set_shader_buffers(&sctx->b, PIPE_SHADER_COMPUTE, 0, num_buffers, buffers,
                         writeable_bitmask,
                         true /* don't update bind_history to prevent unnecessary syncs later */);
   si_launch_grid_internal(sctx, info, shader, flags);

   /* Do cache flushing at the end. */
   if (get_cache_policy(sctx, coher, 0) == L2_BYPASS) {
      if (flags & SI_OP_SYNC_AFTER)
         sctx->flags |= SI_CONTEXT_WB_L2;
   } else {
      while (writeable_bitmask)
         si_resource(buffers[u_bit_scan(&writeable_bitmask)].buffer)->TC_L2_dirty = true;
   }

   /* Restore states. */
   sctx->b.set_shader_buffers(&sctx->b, PIPE_SHADER_COMPUTE, 0, num_buffers, saved_sb,
                              saved_writable_mask);
   for (int i = 0; i < num_buffers; i++)
      pipe_resource_reference(&saved_sb[i].buffer, NULL);
}

/**
 * Clear a buffer using read-modify-write with a 32-bit write bitmask.
 * The clear value has 32 bits.
 */
void si_compute_clear_buffer_rmw(struct si_context *sctx, struct pipe_resource *dst,
                                 unsigned dst_offset, unsigned size,
                                 uint32_t clear_value, uint32_t writebitmask,
                                 unsigned flags, enum si_coherency coher)
{
   assert(dst_offset % 4 == 0);
   assert(size % 4 == 0);

   assert(dst->target != PIPE_BUFFER || dst_offset + size <= dst->width0);

   /* Use buffer_load_dwordx4 and buffer_store_dwordx4 per thread. */
   unsigned dwords_per_instruction = 4;
   unsigned block_size = 64; /* it's always 64x1x1 */
   unsigned dwords_per_wave = dwords_per_instruction * block_size;

   unsigned num_dwords = size / 4;
   unsigned num_instructions = DIV_ROUND_UP(num_dwords, dwords_per_instruction);

   struct pipe_grid_info info = {};
   info.block[0] = MIN2(block_size, num_instructions);
   info.block[1] = 1;
   info.block[2] = 1;
   info.grid[0] = DIV_ROUND_UP(num_dwords, dwords_per_wave);
   info.grid[1] = 1;
   info.grid[2] = 1;

   struct pipe_shader_buffer sb = {};
   sb.buffer = dst;
   sb.buffer_offset = dst_offset;
   sb.buffer_size = size;

   sctx->cs_user_data[0] = clear_value & writebitmask;
   sctx->cs_user_data[1] = ~writebitmask;

   if (!sctx->cs_clear_buffer_rmw)
      sctx->cs_clear_buffer_rmw = si_create_clear_buffer_rmw_cs(sctx);

   si_launch_grid_internal_ssbos(sctx, &info, sctx->cs_clear_buffer_rmw, flags, coher,
                                 1, &sb, 0x1);
}

static void si_compute_clear_12bytes_buffer(struct si_context *sctx, struct pipe_resource *dst,
                                            unsigned dst_offset, unsigned size,
                                            const uint32_t *clear_value, unsigned flags,
                                            enum si_coherency coher)
{
   struct pipe_context *ctx = &sctx->b;

   assert(dst_offset % 4 == 0);
   assert(size % 4 == 0);
   unsigned size_12 = DIV_ROUND_UP(size, 12);

   struct pipe_shader_buffer sb = {0};
   sb.buffer = dst;
   sb.buffer_offset = dst_offset;
   sb.buffer_size = size;

   memcpy(sctx->cs_user_data, clear_value, 12);

   struct pipe_grid_info info = {0};

   if (!sctx->cs_clear_12bytes_buffer)
      sctx->cs_clear_12bytes_buffer = si_clear_12bytes_buffer_shader(ctx);

   info.block[0] = 64;
   info.last_block[0] = size_12 % 64;
   info.block[1] = 1;
   info.block[2] = 1;
   info.grid[0] = DIV_ROUND_UP(size_12, 64);
   info.grid[1] = 1;
   info.grid[2] = 1;

   si_launch_grid_internal_ssbos(sctx, &info, sctx->cs_clear_12bytes_buffer, flags, coher,
                                 1, &sb, 0x1);
}

static void si_compute_do_clear_or_copy(struct si_context *sctx, struct pipe_resource *dst,
                                        unsigned dst_offset, struct pipe_resource *src,
                                        unsigned src_offset, unsigned size,
                                        const uint32_t *clear_value, unsigned clear_value_size,
                                        unsigned flags, enum si_coherency coher)
{
   assert(src_offset % 4 == 0);
   assert(dst_offset % 4 == 0);
   assert(size % 4 == 0);

   assert(dst->target != PIPE_BUFFER || dst_offset + size <= dst->width0);
   assert(!src || src_offset + size <= src->width0);

   /* The memory accesses are coalesced, meaning that the 1st instruction writes
    * the 1st contiguous block of data for the whole wave, the 2nd instruction
    * writes the 2nd contiguous block of data, etc.
    */
   unsigned dwords_per_thread =
      src ? SI_COMPUTE_COPY_DW_PER_THREAD : SI_COMPUTE_CLEAR_DW_PER_THREAD;
   unsigned instructions_per_thread = MAX2(1, dwords_per_thread / 4);
   unsigned dwords_per_instruction = dwords_per_thread / instructions_per_thread;
   /* The shader declares the block size like this: */
   unsigned block_size = si_determine_wave_size(sctx->screen, NULL);
   unsigned dwords_per_wave = dwords_per_thread * block_size;

   unsigned num_dwords = size / 4;
   unsigned num_instructions = DIV_ROUND_UP(num_dwords, dwords_per_instruction);

   struct pipe_grid_info info = {};
   info.block[0] = MIN2(block_size, num_instructions);
   info.block[1] = 1;
   info.block[2] = 1;
   info.grid[0] = DIV_ROUND_UP(num_dwords, dwords_per_wave);
   info.grid[1] = 1;
   info.grid[2] = 1;

   struct pipe_shader_buffer sb[2] = {};
   sb[0].buffer = dst;
   sb[0].buffer_offset = dst_offset;
   sb[0].buffer_size = size;

   bool shader_dst_stream_policy = SI_COMPUTE_DST_CACHE_POLICY != L2_LRU;

   if (src) {
      sb[1].buffer = src;
      sb[1].buffer_offset = src_offset;
      sb[1].buffer_size = size;

      if (!sctx->cs_copy_buffer) {
         sctx->cs_copy_buffer = si_create_dma_compute_shader(
            &sctx->b, SI_COMPUTE_COPY_DW_PER_THREAD, shader_dst_stream_policy, true);
      }

      si_launch_grid_internal_ssbos(sctx, &info, sctx->cs_copy_buffer, flags, coher,
                                    2, sb, 0x1);
   } else {
      assert(clear_value_size >= 4 && clear_value_size <= 16 &&
             util_is_power_of_two_or_zero(clear_value_size));

      for (unsigned i = 0; i < 4; i++)
         sctx->cs_user_data[i] = clear_value[i % (clear_value_size / 4)];

      if (!sctx->cs_clear_buffer) {
         sctx->cs_clear_buffer = si_create_dma_compute_shader(
            &sctx->b, SI_COMPUTE_CLEAR_DW_PER_THREAD, shader_dst_stream_policy, false);
      }

      si_launch_grid_internal_ssbos(sctx, &info, sctx->cs_clear_buffer, flags, coher,
                                    1, sb, 0x1);
   }
}

void si_clear_buffer(struct si_context *sctx, struct pipe_resource *dst,
                     uint64_t offset, uint64_t size, uint32_t *clear_value,
                     uint32_t clear_value_size, unsigned flags,
                     enum si_coherency coher, enum si_clear_method method)
{
   if (!size)
      return;

   si_improve_sync_flags(sctx, dst, NULL, &flags);

   ASSERTED unsigned clear_alignment = MIN2(clear_value_size, 4);

   assert(clear_value_size != 3 && clear_value_size != 6); /* 12 is allowed. */
   assert(offset % clear_alignment == 0);
   assert(size % clear_alignment == 0);
   assert(size < (UINT_MAX & ~0xf)); /* TODO: test 64-bit sizes in all codepaths */

   uint32_t clamped;
   if (util_lower_clearsize_to_dword(clear_value, (int*)&clear_value_size, &clamped))
      clear_value = &clamped;

   if (clear_value_size == 12) {
      si_compute_clear_12bytes_buffer(sctx, dst, offset, size, clear_value, flags, coher);
      return;
   }

   uint64_t aligned_size = size & ~3ull;
   if (aligned_size >= 4) {
      uint64_t compute_min_size;

      if (sctx->chip_class <= GFX8) {
         /* CP DMA clears are terribly slow with GTT on GFX6-8, which can always
          * happen due to BO evictions.
          */
         compute_min_size = 0;
      } else {
         /* Use a small enough size because CP DMA is slower than compute with bigger sizes. */
         compute_min_size = 4 * 1024;
      }

      if (method == SI_AUTO_SELECT_CLEAR_METHOD && (
           clear_value_size > 4 ||
           (clear_value_size == 4 && offset % 4 == 0 && size > compute_min_size))) {
         method = SI_COMPUTE_CLEAR_METHOD;
      }
      if (method == SI_COMPUTE_CLEAR_METHOD) {
         si_compute_do_clear_or_copy(sctx, dst, offset, NULL, 0, aligned_size, clear_value,
                                     clear_value_size, flags, coher);
      } else {
         assert(clear_value_size == 4);
         si_cp_dma_clear_buffer(sctx, &sctx->gfx_cs, dst, offset, aligned_size, *clear_value,
                                flags, coher, get_cache_policy(sctx, coher, size));
      }

      offset += aligned_size;
      size -= aligned_size;
   }

   /* Handle non-dword alignment. */
   if (size) {
      assert(dst);
      assert(dst->target == PIPE_BUFFER);
      assert(size < 4);

      sctx->b.buffer_subdata(&sctx->b, dst,
                             PIPE_MAP_WRITE |
                             /* TC forbids drivers to invalidate buffers and infer unsychronized mappings,
                              * so suppress those optimizations. */
                             (sctx->tc ? TC_TRANSFER_MAP_NO_INFER_UNSYNCHRONIZED |
                                         TC_TRANSFER_MAP_NO_INVALIDATE : 0),
                             offset, size, clear_value);
   }
}

void si_screen_clear_buffer(struct si_screen *sscreen, struct pipe_resource *dst, uint64_t offset,
                            uint64_t size, unsigned value, unsigned flags)
{
   struct si_context *ctx = (struct si_context *)sscreen->aux_context;

   simple_mtx_lock(&sscreen->aux_context_lock);
   si_clear_buffer(ctx, dst, offset, size, &value, 4, flags,
                   SI_COHERENCY_SHADER, SI_AUTO_SELECT_CLEAR_METHOD);
   sscreen->aux_context->flush(sscreen->aux_context, NULL, 0);
   simple_mtx_unlock(&sscreen->aux_context_lock);
}

static void si_pipe_clear_buffer(struct pipe_context *ctx, struct pipe_resource *dst,
                                 unsigned offset, unsigned size, const void *clear_value,
                                 int clear_value_size)
{
   si_clear_buffer((struct si_context *)ctx, dst, offset, size, (uint32_t *)clear_value,
                   clear_value_size, SI_OP_SYNC_BEFORE_AFTER, SI_COHERENCY_SHADER,
                   SI_AUTO_SELECT_CLEAR_METHOD);
}

void si_copy_buffer(struct si_context *sctx, struct pipe_resource *dst, struct pipe_resource *src,
                    uint64_t dst_offset, uint64_t src_offset, unsigned size, unsigned flags)
{
   if (!size)
      return;

   enum si_coherency coher = SI_COHERENCY_SHADER;
   enum si_cache_policy cache_policy = get_cache_policy(sctx, coher, size);
   uint64_t compute_min_size = 8 * 1024;

   si_improve_sync_flags(sctx, dst, src, &flags);

   /* Only use compute for VRAM copies on dGPUs. */
   if (sctx->screen->info.has_dedicated_vram && si_resource(dst)->domains & RADEON_DOMAIN_VRAM &&
       si_resource(src)->domains & RADEON_DOMAIN_VRAM && size > compute_min_size &&
       dst_offset % 4 == 0 && src_offset % 4 == 0 && size % 4 == 0) {
      si_compute_do_clear_or_copy(sctx, dst, dst_offset, src, src_offset, size, NULL, 0,
                                  flags, coher);
   } else {
      si_cp_dma_copy_buffer(sctx, dst, src, dst_offset, src_offset, size,
                            flags, coher, cache_policy);
   }
}

static void
set_work_size(struct pipe_grid_info *info, unsigned block_x, unsigned block_y, unsigned block_z,
              unsigned work_x, unsigned work_y, unsigned work_z)
{
   info->block[0] = block_x;
   info->block[1] = block_y;
   info->block[2] = block_z;

   unsigned work[3] = {work_x, work_y, work_z};
   for (int i = 0; i < 3; ++i) {
      info->last_block[i] = work[i] % info->block[i];
      info->grid[i] = DIV_ROUND_UP(work[i], info->block[i]);
   }
}

void si_compute_copy_image(struct si_context *sctx, struct pipe_resource *dst, unsigned dst_level,
                           struct pipe_resource *src, unsigned src_level, unsigned dstx,
                           unsigned dsty, unsigned dstz, const struct pipe_box *src_box,
                           bool is_dcc_decompress, unsigned flags)
{
   struct pipe_context *ctx = &sctx->b;
   struct si_texture *ssrc = (struct si_texture*)src;
   struct si_texture *sdst = (struct si_texture*)dst;
   unsigned width = src_box->width;
   unsigned height = src_box->height;
   unsigned depth = src_box->depth;
   enum pipe_format src_format = util_format_linear(src->format);
   enum pipe_format dst_format = util_format_linear(dst->format);
   bool is_linear = ssrc->surface.is_linear || sdst->surface.is_linear;
   bool is_1D = dst->target == PIPE_TEXTURE_1D_ARRAY && src->target == PIPE_TEXTURE_1D_ARRAY;

   assert(util_format_is_subsampled_422(src_format) == util_format_is_subsampled_422(dst_format));

   if (!vi_dcc_enabled(ssrc, src_level) &&
       !vi_dcc_enabled(sdst, dst_level) &&
       src_format == dst_format &&
       util_format_is_float(src_format) &&
       !util_format_is_compressed(src_format)) {
      /* Interpret as integer values to avoid NaN issues */
      switch(util_format_get_blocksizebits(src_format)) {
        case 16:
          src_format = dst_format = PIPE_FORMAT_R16_UINT;
          break;
        case 32:
          src_format = dst_format = PIPE_FORMAT_R32_UINT;
          break;
        case 64:
          src_format = dst_format = PIPE_FORMAT_R32G32_UINT;
          break;
        case 128:
          src_format = dst_format = PIPE_FORMAT_R32G32B32A32_UINT;
          break;
        default:
          assert(false);
      }
   }

   if (util_format_is_subsampled_422(src_format)) {
      src_format = dst_format = PIPE_FORMAT_R32_UINT;
      /* Interpreting 422 subsampled format (16 bpp) as 32 bpp
       * should force us to divide src_box->x, dstx and width by 2.
       * But given that ac_surface allocates this format as 32 bpp
       * and that surf_size is then modified to pack the values
       * we must keep the original values to get the correct results.
       */
   }

   if (width == 0 || height == 0)
      return;

   /* The driver doesn't decompress resources automatically here. */
   si_decompress_subresource(ctx, dst, PIPE_MASK_RGBAZS, dst_level, dstz,
                             dstz + src_box->depth - 1);
   si_decompress_subresource(ctx, src, PIPE_MASK_RGBAZS, src_level, src_box->z,
                             src_box->z + src_box->depth - 1);

   /* src and dst have the same number of samples. */
   si_make_CB_shader_coherent(sctx, src->nr_samples, true,
                              ssrc->surface.u.gfx9.color.dcc.pipe_aligned);
   if (sctx->chip_class >= GFX10) {
      /* GFX10+ uses DCC stores so si_make_CB_shader_coherent is required for dst too */
      si_make_CB_shader_coherent(sctx, dst->nr_samples, true,
                                 sdst->surface.u.gfx9.color.dcc.pipe_aligned);
   }

   struct si_images *images = &sctx->images[PIPE_SHADER_COMPUTE];
   struct pipe_image_view saved_image[2] = {0};
   util_copy_image_view(&saved_image[0], &images->views[0]);
   util_copy_image_view(&saved_image[1], &images->views[1]);

   struct pipe_image_view image[2] = {0};
   image[0].resource = src;
   image[0].shader_access = image[0].access = PIPE_IMAGE_ACCESS_READ;
   image[0].format = src_format;
   image[0].u.tex.level = src_level;
   image[0].u.tex.first_layer = 0;
   image[0].u.tex.last_layer = src->target == PIPE_TEXTURE_3D ? u_minify(src->depth0, src_level) - 1
                                                              : (unsigned)(src->array_size - 1);
   image[1].resource = dst;
   image[1].shader_access = image[1].access = PIPE_IMAGE_ACCESS_WRITE;
   image[1].format = dst_format;
   image[1].u.tex.level = dst_level;
   image[1].u.tex.first_layer = 0;
   image[1].u.tex.last_layer = dst->target == PIPE_TEXTURE_3D ? u_minify(dst->depth0, dst_level) - 1
                                                              : (unsigned)(dst->array_size - 1);

   /* SNORM8 blitting has precision issues on some chips. Use the SINT
    * equivalent instead, which doesn't force DCC decompression.
    */
   if (util_format_is_snorm8(dst->format)) {
      image[0].format = image[1].format = util_format_snorm8_to_sint8(dst->format);
   }

   if (is_dcc_decompress)
      image[1].access |= SI_IMAGE_ACCESS_DCC_OFF;
   else if (sctx->chip_class >= GFX10)
      image[1].access |= SI_IMAGE_ACCESS_ALLOW_DCC_STORE;

   ctx->set_shader_images(ctx, PIPE_SHADER_COMPUTE, 0, 2, 0, image);

   struct pipe_grid_info info = {0};

   if (is_dcc_decompress) {
      /* The DCC decompression is a normal blit where the load is compressed
       * and the store is uncompressed. The workgroup size is either equal to
       * the DCC block size or a multiple thereof. The shader uses a barrier
       * between loads and stores to safely overwrite each DCC block of pixels.
       */
      assert(src == dst);
      assert(dst->target != PIPE_TEXTURE_1D && dst->target != PIPE_TEXTURE_1D_ARRAY);

      if (!sctx->cs_dcc_decompress)
         sctx->cs_dcc_decompress = si_create_dcc_decompress_cs(ctx);

      unsigned block_x = ssrc->surface.u.gfx9.color.dcc_block_width;
      unsigned block_y = ssrc->surface.u.gfx9.color.dcc_block_height;
      unsigned block_z = ssrc->surface.u.gfx9.color.dcc_block_depth;

      unsigned default_wave_size = si_determine_wave_size(sctx->screen, NULL);;

      /* Make sure the block size is at least the same as wave size. */
      while (block_x * block_y * block_z < default_wave_size) {
         block_x *= 2;
      }

      set_work_size(&info, block_x, block_y, block_z, src_box->width, src_box->height, src_box->depth);

      si_launch_grid_internal(sctx, &info, sctx->cs_dcc_decompress, flags | SI_OP_CS_IMAGE);
   } else {
      sctx->cs_user_data[0] = src_box->x | (dstx << 16);

      int block_x = is_1D || is_linear ? 64 : 8;
      int block_y = is_1D || is_linear ? 1 : 8;
      int block_z = 1;

      if (is_1D) {
         assert(height == 1); /* height is not used for 1D images */
         assert(src_box->y == 0 && dsty == 0);

         sctx->cs_user_data[1] = src_box->z | (dstz << 16);

         /* We pass array index in 'y' for 1D images. */
         height = depth;
         depth = 1;
      } else {
         sctx->cs_user_data[1] = src_box->y | (dsty << 16);
         sctx->cs_user_data[2] = src_box->z | (dstz << 16);
      }

      set_work_size(&info, block_x, block_y, block_z, width, height, depth);

      void **copy_image_cs_ptr = is_1D ? &sctx->cs_copy_image_1D : &sctx->cs_copy_image_2D;
      if (!*copy_image_cs_ptr)
         *copy_image_cs_ptr = si_create_copy_image_cs(sctx, is_1D);

      assert(*copy_image_cs_ptr);

      si_launch_grid_internal(sctx, &info, *copy_image_cs_ptr, flags | SI_OP_CS_IMAGE);
   }

   ctx->set_shader_images(ctx, PIPE_SHADER_COMPUTE, 0, 2, 0, saved_image);
   for (int i = 0; i < 2; i++)
      pipe_resource_reference(&saved_image[i].resource, NULL);
}

void si_retile_dcc(struct si_context *sctx, struct si_texture *tex)
{
   /* Set the DCC buffer. */
   assert(tex->surface.meta_offset && tex->surface.meta_offset <= UINT_MAX);
   assert(tex->surface.display_dcc_offset && tex->surface.display_dcc_offset <= UINT_MAX);
   assert(tex->surface.display_dcc_offset < tex->surface.meta_offset);
   assert(tex->buffer.bo_size <= UINT_MAX);

   struct pipe_shader_buffer sb = {};
   sb.buffer = &tex->buffer.b.b;
   sb.buffer_offset = tex->surface.display_dcc_offset;
   sb.buffer_size = tex->buffer.bo_size - sb.buffer_offset;

   sctx->cs_user_data[0] = tex->surface.meta_offset - tex->surface.display_dcc_offset;
   sctx->cs_user_data[1] = (tex->surface.u.gfx9.color.dcc_pitch_max + 1) |
                           (tex->surface.u.gfx9.color.dcc_height << 16);
   sctx->cs_user_data[2] = (tex->surface.u.gfx9.color.display_dcc_pitch_max + 1) |
                           (tex->surface.u.gfx9.color.display_dcc_height << 16);

   /* We have only 1 variant per bpp for now, so expect 32 bpp. */
   assert(tex->surface.bpe == 4);

   void **shader = &sctx->cs_dcc_retile[tex->surface.u.gfx9.swizzle_mode];
   if (!*shader)
      *shader = si_create_dcc_retile_cs(sctx, &tex->surface);

   /* Dispatch compute. */
   unsigned width = DIV_ROUND_UP(tex->buffer.b.b.width0, tex->surface.u.gfx9.color.dcc_block_width);
   unsigned height = DIV_ROUND_UP(tex->buffer.b.b.height0, tex->surface.u.gfx9.color.dcc_block_height);

   struct pipe_grid_info info = {};
   info.block[0] = 8;
   info.block[1] = 8;
   info.block[2] = 1;
   info.last_block[0] = width % info.block[0];
   info.last_block[1] = height % info.block[1];
   info.grid[0] = DIV_ROUND_UP(width, info.block[0]);
   info.grid[1] = DIV_ROUND_UP(height, info.block[1]);
   info.grid[2] = 1;

   si_launch_grid_internal_ssbos(sctx, &info, *shader, SI_OP_SYNC_BEFORE,
                                 SI_COHERENCY_CB_META, 1, &sb, 0x1);

   /* Don't flush caches. L2 will be flushed by the kernel fence. */
}

void gfx9_clear_dcc_msaa(struct si_context *sctx, struct pipe_resource *res, uint32_t clear_value,
                         unsigned flags, enum si_coherency coher)
{
   struct si_texture *tex = (struct si_texture*)res;

   /* Set the DCC buffer. */
   assert(tex->surface.meta_offset && tex->surface.meta_offset <= UINT_MAX);
   assert(tex->buffer.bo_size <= UINT_MAX);

   struct pipe_shader_buffer sb = {};
   sb.buffer = &tex->buffer.b.b;
   sb.buffer_offset = tex->surface.meta_offset;
   sb.buffer_size = tex->buffer.bo_size - sb.buffer_offset;

   sctx->cs_user_data[0] = (tex->surface.u.gfx9.color.dcc_pitch_max + 1) |
                           (tex->surface.u.gfx9.color.dcc_height << 16);
   sctx->cs_user_data[1] = (clear_value & 0xffff) |
                           ((uint32_t)tex->surface.tile_swizzle << 16);

   /* These variables identify the shader variant. */
   unsigned swizzle_mode = tex->surface.u.gfx9.swizzle_mode;
   unsigned bpe_log2 = util_logbase2(tex->surface.bpe);
   unsigned log2_samples = util_logbase2(tex->buffer.b.b.nr_samples);
   bool fragments8 = tex->buffer.b.b.nr_storage_samples == 8;
   bool is_array = tex->buffer.b.b.array_size > 1;
   void **shader = &sctx->cs_clear_dcc_msaa[swizzle_mode][bpe_log2][fragments8][log2_samples - 2][is_array];

   if (!*shader)
      *shader = gfx9_create_clear_dcc_msaa_cs(sctx, tex);

   /* Dispatch compute. */
   unsigned width = DIV_ROUND_UP(tex->buffer.b.b.width0, tex->surface.u.gfx9.color.dcc_block_width);
   unsigned height = DIV_ROUND_UP(tex->buffer.b.b.height0, tex->surface.u.gfx9.color.dcc_block_height);
   unsigned depth = DIV_ROUND_UP(tex->buffer.b.b.array_size, tex->surface.u.gfx9.color.dcc_block_depth);

   struct pipe_grid_info info = {};
   info.block[0] = 8;
   info.block[1] = 8;
   info.block[2] = 1;
   info.last_block[0] = width % info.block[0];
   info.last_block[1] = height % info.block[1];
   info.grid[0] = DIV_ROUND_UP(width, info.block[0]);
   info.grid[1] = DIV_ROUND_UP(height, info.block[1]);
   info.grid[2] = depth;

   si_launch_grid_internal_ssbos(sctx, &info, *shader, flags, coher, 1, &sb, 0x1);
}

/* Expand FMASK to make it identity, so that image stores can ignore it. */
void si_compute_expand_fmask(struct pipe_context *ctx, struct pipe_resource *tex)
{
   struct si_context *sctx = (struct si_context *)ctx;
   bool is_array = tex->target == PIPE_TEXTURE_2D_ARRAY;
   unsigned log_fragments = util_logbase2(tex->nr_storage_samples);
   unsigned log_samples = util_logbase2(tex->nr_samples);
   assert(tex->nr_samples >= 2);

   /* EQAA FMASK expansion is unimplemented. */
   if (tex->nr_samples != tex->nr_storage_samples)
      return;

   si_make_CB_shader_coherent(sctx, tex->nr_samples, true,
                              ((struct si_texture*)tex)->surface.u.gfx9.color.dcc.pipe_aligned);

   /* Save states. */
   struct pipe_image_view saved_image = {0};
   util_copy_image_view(&saved_image, &sctx->images[PIPE_SHADER_COMPUTE].views[0]);

   /* Bind the image. */
   struct pipe_image_view image = {0};
   image.resource = tex;
   /* Don't set WRITE so as not to trigger FMASK expansion, causing
    * an infinite loop. */
   image.shader_access = image.access = PIPE_IMAGE_ACCESS_READ;
   image.format = util_format_linear(tex->format);
   if (is_array)
      image.u.tex.last_layer = tex->array_size - 1;

   ctx->set_shader_images(ctx, PIPE_SHADER_COMPUTE, 0, 1, 0, &image);

   /* Bind the shader. */
   void **shader = &sctx->cs_fmask_expand[log_samples - 1][is_array];
   if (!*shader)
      *shader = si_create_fmask_expand_cs(ctx, tex->nr_samples, is_array);

   /* Dispatch compute. */
   struct pipe_grid_info info = {0};
   info.block[0] = 8;
   info.last_block[0] = tex->width0 % 8;
   info.block[1] = 8;
   info.last_block[1] = tex->height0 % 8;
   info.block[2] = 1;
   info.grid[0] = DIV_ROUND_UP(tex->width0, 8);
   info.grid[1] = DIV_ROUND_UP(tex->height0, 8);
   info.grid[2] = is_array ? tex->array_size : 1;

   si_launch_grid_internal(sctx, &info, *shader, SI_OP_SYNC_BEFORE_AFTER);

   /* Restore previous states. */
   ctx->set_shader_images(ctx, PIPE_SHADER_COMPUTE, 0, 1, 0, &saved_image);
   pipe_resource_reference(&saved_image.resource, NULL);

   /* Array of fully expanded FMASK values, arranged by [log2(fragments)][log2(samples)-1]. */
#define INVALID 0 /* never used */
   static const uint64_t fmask_expand_values[][4] = {
      /* samples */
      /* 2 (8 bpp) 4 (8 bpp)   8 (8-32bpp) 16 (16-64bpp)      fragments */
      {0x02020202, 0x0E0E0E0E, 0xFEFEFEFE, 0xFFFEFFFE},      /* 1 */
      {0x02020202, 0xA4A4A4A4, 0xAAA4AAA4, 0xAAAAAAA4},      /* 2 */
      {INVALID, 0xE4E4E4E4, 0x44443210, 0x4444444444443210}, /* 4 */
      {INVALID, INVALID, 0x76543210, 0x8888888876543210},    /* 8 */
   };

   /* Clear FMASK to identity. */
   struct si_texture *stex = (struct si_texture *)tex;
   si_clear_buffer(sctx, tex, stex->surface.fmask_offset, stex->surface.fmask_size,
                   (uint32_t *)&fmask_expand_values[log_fragments][log_samples - 1],
                   log_fragments >= 2 && log_samples == 4 ? 8 : 4, SI_OP_SYNC_AFTER,
                   SI_COHERENCY_SHADER, SI_AUTO_SELECT_CLEAR_METHOD);
}

void si_init_compute_blit_functions(struct si_context *sctx)
{
   sctx->b.clear_buffer = si_pipe_clear_buffer;
}

/* Clear a region of a color surface to a constant value. */
void si_compute_clear_render_target(struct pipe_context *ctx, struct pipe_surface *dstsurf,
                                    const union pipe_color_union *color, unsigned dstx,
                                    unsigned dsty, unsigned width, unsigned height,
                                    bool render_condition_enabled)
{
   struct si_context *sctx = (struct si_context *)ctx;
   struct si_texture *tex = (struct si_texture*)dstsurf->texture;
   unsigned num_layers = dstsurf->u.tex.last_layer - dstsurf->u.tex.first_layer + 1;
   unsigned data[4 + sizeof(color->ui)] = {dstx, dsty, dstsurf->u.tex.first_layer, 0};

   if (width == 0 || height == 0)
      return;

   /* The driver doesn't decompress resources automatically here. */
   si_decompress_subresource(ctx, dstsurf->texture, PIPE_MASK_RGBA, dstsurf->u.tex.level,
                             dstsurf->u.tex.first_layer, dstsurf->u.tex.last_layer);

   if (util_format_is_srgb(dstsurf->format)) {
      union pipe_color_union color_srgb;
      for (int i = 0; i < 3; i++)
         color_srgb.f[i] = util_format_linear_to_srgb_float(color->f[i]);
      color_srgb.f[3] = color->f[3];
      memcpy(data + 4, color_srgb.ui, sizeof(color->ui));
   } else {
      memcpy(data + 4, color->ui, sizeof(color->ui));
   }

   si_make_CB_shader_coherent(sctx, dstsurf->texture->nr_samples, true,
                              tex->surface.u.gfx9.color.dcc.pipe_aligned);

   struct pipe_constant_buffer saved_cb = {};
   si_get_pipe_constant_buffer(sctx, PIPE_SHADER_COMPUTE, 0, &saved_cb);

   struct si_images *images = &sctx->images[PIPE_SHADER_COMPUTE];
   struct pipe_image_view saved_image = {0};
   util_copy_image_view(&saved_image, &images->views[0]);

   struct pipe_constant_buffer cb = {};
   cb.buffer_size = sizeof(data);
   cb.user_buffer = data;
   ctx->set_constant_buffer(ctx, PIPE_SHADER_COMPUTE, 0, false, &cb);

   struct pipe_image_view image = {0};
   image.resource = dstsurf->texture;
   image.shader_access = image.access = PIPE_IMAGE_ACCESS_WRITE | SI_IMAGE_ACCESS_ALLOW_DCC_STORE;
   image.format = util_format_linear(dstsurf->format);
   image.u.tex.level = dstsurf->u.tex.level;
   image.u.tex.first_layer = 0; /* 3D images ignore first_layer (BASE_ARRAY) */
   image.u.tex.last_layer = dstsurf->u.tex.last_layer;

   ctx->set_shader_images(ctx, PIPE_SHADER_COMPUTE, 0, 1, 0, &image);

   struct pipe_grid_info info = {0};
   void *shader;

   if (dstsurf->texture->target != PIPE_TEXTURE_1D_ARRAY) {
      if (!sctx->cs_clear_render_target)
         sctx->cs_clear_render_target = si_clear_render_target_shader(ctx);
      shader = sctx->cs_clear_render_target;

      info.block[0] = 8;
      info.last_block[0] = width % 8;
      info.block[1] = 8;
      info.last_block[1] = height % 8;
      info.block[2] = 1;
      info.grid[0] = DIV_ROUND_UP(width, 8);
      info.grid[1] = DIV_ROUND_UP(height, 8);
      info.grid[2] = num_layers;
   } else {
      if (!sctx->cs_clear_render_target_1d_array)
         sctx->cs_clear_render_target_1d_array = si_clear_render_target_shader_1d_array(ctx);
      shader = sctx->cs_clear_render_target_1d_array;

      info.block[0] = 64;
      info.last_block[0] = width % 64;
      info.block[1] = 1;
      info.block[2] = 1;
      info.grid[0] = DIV_ROUND_UP(width, 64);
      info.grid[1] = num_layers;
      info.grid[2] = 1;
   }

   si_launch_grid_internal(sctx, &info, shader, SI_OP_SYNC_BEFORE_AFTER | SI_OP_CS_IMAGE |
                           (render_condition_enabled ? SI_OP_CS_RENDER_COND_ENABLE : 0));

   ctx->set_shader_images(ctx, PIPE_SHADER_COMPUTE, 0, 1, 0, &saved_image);
   ctx->set_constant_buffer(ctx, PIPE_SHADER_COMPUTE, 0, true, &saved_cb);
   pipe_resource_reference(&saved_image.resource, NULL);
}