radeonsi: enable TC-compatible HTILE on demand for best Z/S performance

[mesa.git] / src / gallium / drivers / radeonsi / si_texture.c

/*
 * Copyright 2010 Jerome Glisse <glisse@freedesktop.org>
 * 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 "drm-uapi/drm_fourcc.h"
#include "si_pipe.h"
#include "si_query.h"
#include "sid.h"
#include "state_tracker/drm_driver.h"
#include "util/format/u_format.h"
#include "util/os_time.h"
#include "util/u_log.h"
#include "util/u_memory.h"
#include "util/u_pack_color.h"
#include "util/u_resource.h"
#include "util/u_surface.h"
#include "util/u_transfer.h"

#include <errno.h>
#include <inttypes.h>

#include "amd/addrlib/inc/addrinterface.h"

static enum radeon_surf_mode si_choose_tiling(struct si_screen *sscreen,
                                              const struct pipe_resource *templ,
                                              bool tc_compatible_htile);

bool si_prepare_for_dma_blit(struct si_context *sctx, struct si_texture *dst, unsigned dst_level,
                             unsigned dstx, unsigned dsty, unsigned dstz, struct si_texture *src,
                             unsigned src_level, const struct pipe_box *src_box)
{
   if (!sctx->sdma_cs)
      return false;

   if (dst->surface.bpe != src->surface.bpe)
      return false;

   /* MSAA: Blits don't exist in the real world. */
   if (src->buffer.b.b.nr_samples > 1 || dst->buffer.b.b.nr_samples > 1)
      return false;

   /* Depth-stencil surfaces:
    *   When dst is linear, the DB->CB copy preserves HTILE.
    *   When dst is tiled, the 3D path must be used to update HTILE.
    */
   if (src->is_depth || dst->is_depth)
      return false;

   /* DCC as:
    *   src: Use the 3D path. DCC decompression is expensive.
    *   dst: Use the 3D path to compress the pixels with DCC.
    */
   if (vi_dcc_enabled(src, src_level) || vi_dcc_enabled(dst, dst_level))
      return false;

   /* CMASK as:
    *   src: Both texture and SDMA paths need decompression. Use SDMA.
    *   dst: If overwriting the whole texture, discard CMASK and use
    *        SDMA. Otherwise, use the 3D path.
    */
   if (dst->cmask_buffer && dst->dirty_level_mask & (1 << dst_level)) {
      /* The CMASK clear is only enabled for the first level. */
      assert(dst_level == 0);
      if (!util_texrange_covers_whole_level(&dst->buffer.b.b, dst_level, dstx, dsty, dstz,
                                            src_box->width, src_box->height, src_box->depth))
         return false;

      si_texture_discard_cmask(sctx->screen, dst);
   }

   /* All requirements are met. Prepare textures for SDMA. */
   if (src->cmask_buffer && src->dirty_level_mask & (1 << src_level))
      sctx->b.flush_resource(&sctx->b, &src->buffer.b.b);

   assert(!(src->dirty_level_mask & (1 << src_level)));
   assert(!(dst->dirty_level_mask & (1 << dst_level)));

   return true;
}

/* Same as resource_copy_region, except that both upsampling and downsampling are allowed. */
static void si_copy_region_with_blit(struct pipe_context *pipe, struct pipe_resource *dst,
                                     unsigned dst_level, unsigned dstx, unsigned dsty,
                                     unsigned dstz, struct pipe_resource *src, unsigned src_level,
                                     const struct pipe_box *src_box)
{
   struct pipe_blit_info blit;

   memset(&blit, 0, sizeof(blit));
   blit.src.resource = src;
   blit.src.format = src->format;
   blit.src.level = src_level;
   blit.src.box = *src_box;
   blit.dst.resource = dst;
   blit.dst.format = dst->format;
   blit.dst.level = dst_level;
   blit.dst.box.x = dstx;
   blit.dst.box.y = dsty;
   blit.dst.box.z = dstz;
   blit.dst.box.width = src_box->width;
   blit.dst.box.height = src_box->height;
   blit.dst.box.depth = src_box->depth;
   blit.mask = util_format_get_mask(dst->format);
   blit.filter = PIPE_TEX_FILTER_NEAREST;

   if (blit.mask) {
      pipe->blit(pipe, &blit);
   }
}

/* Copy from a full GPU texture to a transfer's staging one. */
static void si_copy_to_staging_texture(struct pipe_context *ctx, struct si_transfer *stransfer)
{
   struct si_context *sctx = (struct si_context *)ctx;
   struct pipe_transfer *transfer = (struct pipe_transfer *)stransfer;
   struct pipe_resource *dst = &stransfer->staging->b.b;
   struct pipe_resource *src = transfer->resource;

   if (src->nr_samples > 1 || ((struct si_texture *)src)->is_depth) {
      si_copy_region_with_blit(ctx, dst, 0, 0, 0, 0, src, transfer->level, &transfer->box);
      return;
   }

   sctx->dma_copy(ctx, dst, 0, 0, 0, 0, src, transfer->level, &transfer->box);
}

/* Copy from a transfer's staging texture to a full GPU one. */
static void si_copy_from_staging_texture(struct pipe_context *ctx, struct si_transfer *stransfer)
{
   struct si_context *sctx = (struct si_context *)ctx;
   struct pipe_transfer *transfer = (struct pipe_transfer *)stransfer;
   struct pipe_resource *dst = transfer->resource;
   struct pipe_resource *src = &stransfer->staging->b.b;
   struct pipe_box sbox;

   u_box_3d(0, 0, 0, transfer->box.width, transfer->box.height, transfer->box.depth, &sbox);

   if (dst->nr_samples > 1 || ((struct si_texture *)dst)->is_depth) {
      si_copy_region_with_blit(ctx, dst, transfer->level, transfer->box.x, transfer->box.y,
                               transfer->box.z, src, 0, &sbox);
      return;
   }

   if (util_format_is_compressed(dst->format)) {
      sbox.width = util_format_get_nblocksx(dst->format, sbox.width);
      sbox.height = util_format_get_nblocksx(dst->format, sbox.height);
   }

   sctx->dma_copy(ctx, dst, transfer->level, transfer->box.x, transfer->box.y, transfer->box.z, src,
                  0, &sbox);
}

static unsigned si_texture_get_offset(struct si_screen *sscreen, struct si_texture *tex,
                                      unsigned level, const struct pipe_box *box, unsigned *stride,
                                      unsigned *layer_stride)
{
   if (sscreen->info.chip_class >= GFX9) {
      *stride = tex->surface.u.gfx9.surf_pitch * tex->surface.bpe;
      *layer_stride = tex->surface.u.gfx9.surf_slice_size;

      if (!box)
         return 0;

      /* Each texture is an array of slices. Each slice is an array
       * of mipmap levels. */
      return tex->surface.u.gfx9.surf_offset + box->z * tex->surface.u.gfx9.surf_slice_size +
             tex->surface.u.gfx9.offset[level] +
             (box->y / tex->surface.blk_h * tex->surface.u.gfx9.surf_pitch +
              box->x / tex->surface.blk_w) *
                tex->surface.bpe;
   } else {
      *stride = tex->surface.u.legacy.level[level].nblk_x * tex->surface.bpe;
      assert((uint64_t)tex->surface.u.legacy.level[level].slice_size_dw * 4 <= UINT_MAX);
      *layer_stride = (uint64_t)tex->surface.u.legacy.level[level].slice_size_dw * 4;

      if (!box)
         return tex->surface.u.legacy.level[level].offset;

      /* Each texture is an array of mipmap levels. Each level is
       * an array of slices. */
      return tex->surface.u.legacy.level[level].offset +
             box->z * (uint64_t)tex->surface.u.legacy.level[level].slice_size_dw * 4 +
             (box->y / tex->surface.blk_h * tex->surface.u.legacy.level[level].nblk_x +
              box->x / tex->surface.blk_w) *
                tex->surface.bpe;
   }
}

static int si_init_surface(struct si_screen *sscreen, struct radeon_surf *surface,
                           const struct pipe_resource *ptex, enum radeon_surf_mode array_mode,
                           unsigned pitch_in_bytes_override, bool is_imported, bool is_scanout,
                           bool is_flushed_depth, bool tc_compatible_htile)
{
   const struct util_format_description *desc = util_format_description(ptex->format);
   bool is_depth, is_stencil;
   int r;
   unsigned bpe, flags = 0;

   is_depth = util_format_has_depth(desc);
   is_stencil = util_format_has_stencil(desc);

   if (!is_flushed_depth && ptex->format == PIPE_FORMAT_Z32_FLOAT_S8X24_UINT) {
      bpe = 4; /* stencil is allocated separately */
   } else {
      bpe = util_format_get_blocksize(ptex->format);
      assert(util_is_power_of_two_or_zero(bpe));
   }

   if (!is_flushed_depth && is_depth) {
      flags |= RADEON_SURF_ZBUFFER;

      if (sscreen->debug_flags & DBG(NO_HYPERZ)) {
         flags |= RADEON_SURF_NO_HTILE;
      } else if (tc_compatible_htile &&
                 (sscreen->info.chip_class >= GFX9 || array_mode == RADEON_SURF_MODE_2D)) {
         /* TC-compatible HTILE only supports Z32_FLOAT.
          * GFX9 also supports Z16_UNORM.
          * On GFX8, promote Z16 to Z32. DB->CB copies will convert
          * the format for transfers.
          */
         if (sscreen->info.chip_class == GFX8)
            bpe = 4;

         flags |= RADEON_SURF_TC_COMPATIBLE_HTILE;
      }

      if (is_stencil)
         flags |= RADEON_SURF_SBUFFER;
   }

   if (sscreen->info.chip_class >= GFX8 &&
       (ptex->flags & SI_RESOURCE_FLAG_DISABLE_DCC || ptex->format == PIPE_FORMAT_R9G9B9E5_FLOAT ||
        (ptex->nr_samples >= 2 && !sscreen->dcc_msaa_allowed)))
      flags |= RADEON_SURF_DISABLE_DCC;

   /* Stoney: 128bpp MSAA textures randomly fail piglit tests with DCC. */
   if (sscreen->info.family == CHIP_STONEY && bpe == 16 && ptex->nr_samples >= 2)
      flags |= RADEON_SURF_DISABLE_DCC;

   /* GFX8: DCC clear for 4x and 8x MSAA array textures unimplemented. */
   if (sscreen->info.chip_class == GFX8 && ptex->nr_storage_samples >= 4 && ptex->array_size > 1)
      flags |= RADEON_SURF_DISABLE_DCC;

   /* GFX9: DCC clear for 4x and 8x MSAA textures unimplemented. */
   if (sscreen->info.chip_class == GFX9 &&
       (ptex->nr_storage_samples >= 4 ||
        (sscreen->info.family == CHIP_RAVEN && ptex->nr_storage_samples >= 2 && bpe < 4)))
      flags |= RADEON_SURF_DISABLE_DCC;

   /* TODO: GFX10: DCC causes corruption with MSAA. */
   if (sscreen->info.chip_class >= GFX10 && ptex->nr_storage_samples >= 2)
      flags |= RADEON_SURF_DISABLE_DCC;

   /* Shared textures must always set up DCC.
    * If it's not present, it will be disabled by
    * si_get_opaque_metadata later.
    */
   if (!is_imported && (sscreen->debug_flags & DBG(NO_DCC)))
      flags |= RADEON_SURF_DISABLE_DCC;

   if (is_scanout) {
      /* This should catch bugs in gallium users setting incorrect flags. */
      assert(ptex->nr_samples <= 1 && ptex->array_size == 1 && ptex->depth0 == 1 &&
             ptex->last_level == 0 && !(flags & RADEON_SURF_Z_OR_SBUFFER));

      flags |= RADEON_SURF_SCANOUT;
   }

   if (ptex->bind & PIPE_BIND_SHARED)
      flags |= RADEON_SURF_SHAREABLE;
   if (is_imported)
      flags |= RADEON_SURF_IMPORTED | RADEON_SURF_SHAREABLE;
   if (sscreen->debug_flags & DBG(NO_FMASK))
      flags |= RADEON_SURF_NO_FMASK;

   if (sscreen->info.chip_class == GFX9 && (ptex->flags & SI_RESOURCE_FLAG_FORCE_MICRO_TILE_MODE)) {
      flags |= RADEON_SURF_FORCE_MICRO_TILE_MODE;
      surface->micro_tile_mode = SI_RESOURCE_FLAG_MICRO_TILE_MODE_GET(ptex->flags);
   }

   if (ptex->flags & SI_RESOURCE_FLAG_FORCE_MSAA_TILING) {
      flags |= RADEON_SURF_FORCE_SWIZZLE_MODE;

      if (sscreen->info.chip_class >= GFX10)
         surface->u.gfx9.surf.swizzle_mode = ADDR_SW_64KB_R_X;
   }

   r = sscreen->ws->surface_init(sscreen->ws, ptex, flags, bpe, array_mode, surface);
   if (r) {
      return r;
   }

   unsigned pitch = pitch_in_bytes_override / bpe;

   if (sscreen->info.chip_class >= GFX9) {
      if (pitch) {
         surface->u.gfx9.surf_pitch = pitch;
         if (ptex->last_level == 0)
            surface->u.gfx9.surf.epitch = pitch - 1;
         surface->u.gfx9.surf_slice_size = (uint64_t)pitch * surface->u.gfx9.surf_height * bpe;
      }
   } else {
      if (pitch) {
         surface->u.legacy.level[0].nblk_x = pitch;
         surface->u.legacy.level[0].slice_size_dw =
            ((uint64_t)pitch * surface->u.legacy.level[0].nblk_y * bpe) / 4;
      }
   }
   return 0;
}

static void si_get_display_metadata(struct si_screen *sscreen, struct radeon_surf *surf,
                                    struct radeon_bo_metadata *metadata,
                                    enum radeon_surf_mode *array_mode, bool *is_scanout)
{
   if (sscreen->info.chip_class >= GFX9) {
      if (metadata->u.gfx9.swizzle_mode > 0)
         *array_mode = RADEON_SURF_MODE_2D;
      else
         *array_mode = RADEON_SURF_MODE_LINEAR_ALIGNED;

      surf->u.gfx9.surf.swizzle_mode = metadata->u.gfx9.swizzle_mode;
      surf->u.gfx9.dcc.independent_64B_blocks = metadata->u.gfx9.dcc_independent_64B;
      surf->u.gfx9.dcc.independent_128B_blocks = metadata->u.gfx9.dcc_independent_128B;
      surf->u.gfx9.dcc.max_compressed_block_size = metadata->u.gfx9.dcc_max_compressed_block_size;
      surf->u.gfx9.display_dcc_pitch_max = metadata->u.gfx9.dcc_pitch_max;
      *is_scanout = metadata->u.gfx9.scanout;
   } else {
      surf->u.legacy.pipe_config = metadata->u.legacy.pipe_config;
      surf->u.legacy.bankw = metadata->u.legacy.bankw;
      surf->u.legacy.bankh = metadata->u.legacy.bankh;
      surf->u.legacy.tile_split = metadata->u.legacy.tile_split;
      surf->u.legacy.mtilea = metadata->u.legacy.mtilea;
      surf->u.legacy.num_banks = metadata->u.legacy.num_banks;

      if (metadata->u.legacy.macrotile == RADEON_LAYOUT_TILED)
         *array_mode = RADEON_SURF_MODE_2D;
      else if (metadata->u.legacy.microtile == RADEON_LAYOUT_TILED)
         *array_mode = RADEON_SURF_MODE_1D;
      else
         *array_mode = RADEON_SURF_MODE_LINEAR_ALIGNED;

      *is_scanout = metadata->u.legacy.scanout;
   }
}

void si_eliminate_fast_color_clear(struct si_context *sctx, struct si_texture *tex)
{
   struct si_screen *sscreen = sctx->screen;
   struct pipe_context *ctx = &sctx->b;

   if (ctx == sscreen->aux_context)
      simple_mtx_lock(&sscreen->aux_context_lock);

   unsigned n = sctx->num_decompress_calls;
   ctx->flush_resource(ctx, &tex->buffer.b.b);

   /* Flush only if any fast clear elimination took place. */
   if (n != sctx->num_decompress_calls)
      ctx->flush(ctx, NULL, 0);

   if (ctx == sscreen->aux_context)
      simple_mtx_unlock(&sscreen->aux_context_lock);
}

void si_texture_discard_cmask(struct si_screen *sscreen, struct si_texture *tex)
{
   if (!tex->cmask_buffer)
      return;

   assert(tex->buffer.b.b.nr_samples <= 1);

   /* Disable CMASK. */
   tex->cmask_base_address_reg = tex->buffer.gpu_address >> 8;
   tex->dirty_level_mask = 0;

   tex->cb_color_info &= ~S_028C70_FAST_CLEAR(1);

   if (tex->cmask_buffer != &tex->buffer)
      si_resource_reference(&tex->cmask_buffer, NULL);

   tex->cmask_buffer = NULL;

   /* Notify all contexts about the change. */
   p_atomic_inc(&sscreen->dirty_tex_counter);
   p_atomic_inc(&sscreen->compressed_colortex_counter);
}

static bool si_can_disable_dcc(struct si_texture *tex)
{
   /* We can't disable DCC if it can be written by another process. */
   return tex->surface.dcc_offset &&
          (!tex->buffer.b.is_shared ||
           !(tex->buffer.external_usage & PIPE_HANDLE_USAGE_FRAMEBUFFER_WRITE));
}

static void si_texture_zero_dcc_fields(struct si_texture *tex)
{
   tex->surface.dcc_offset = 0;
   tex->surface.display_dcc_offset = 0;
   tex->surface.dcc_retile_map_offset = 0;
}

static bool si_texture_discard_dcc(struct si_screen *sscreen, struct si_texture *tex)
{
   if (!si_can_disable_dcc(tex))
      return false;

   assert(tex->dcc_separate_buffer == NULL);

   /* Disable DCC. */
   si_texture_zero_dcc_fields(tex);

   /* Notify all contexts about the change. */
   p_atomic_inc(&sscreen->dirty_tex_counter);
   return true;
}

/**
 * Disable DCC for the texture. (first decompress, then discard metadata).
 *
 * There is unresolved multi-context synchronization issue between
 * screen::aux_context and the current context. If applications do this with
 * multiple contexts, it's already undefined behavior for them and we don't
 * have to worry about that. The scenario is:
 *
 * If context 1 disables DCC and context 2 has queued commands that write
 * to the texture via CB with DCC enabled, and the order of operations is
 * as follows:
 *   context 2 queues draw calls rendering to the texture, but doesn't flush
 *   context 1 disables DCC and flushes
 *   context 1 & 2 reset descriptors and FB state
 *   context 2 flushes (new compressed tiles written by the draw calls)
 *   context 1 & 2 read garbage, because DCC is disabled, yet there are
 *   compressed tiled
 *
 * \param sctx  the current context if you have one, or sscreen->aux_context
 *              if you don't.
 */
bool si_texture_disable_dcc(struct si_context *sctx, struct si_texture *tex)
{
   struct si_screen *sscreen = sctx->screen;

   if (!sctx->has_graphics)
      return si_texture_discard_dcc(sscreen, tex);

   if (!si_can_disable_dcc(tex))
      return false;

   if (&sctx->b == sscreen->aux_context)
      simple_mtx_lock(&sscreen->aux_context_lock);

   /* Decompress DCC. */
   si_decompress_dcc(sctx, tex);
   sctx->b.flush(&sctx->b, NULL, 0);

   if (&sctx->b == sscreen->aux_context)
      simple_mtx_unlock(&sscreen->aux_context_lock);

   return si_texture_discard_dcc(sscreen, tex);
}

static void si_reallocate_texture_inplace(struct si_context *sctx, struct si_texture *tex,
                                          unsigned new_bind_flag, bool invalidate_storage)
{
   struct pipe_screen *screen = sctx->b.screen;
   struct si_texture *new_tex;
   struct pipe_resource templ = tex->buffer.b.b;
   unsigned i;

   templ.bind |= new_bind_flag;

   if (tex->buffer.b.is_shared || tex->num_planes > 1)
      return;

   if (new_bind_flag == PIPE_BIND_LINEAR) {
      if (tex->surface.is_linear)
         return;

      /* This fails with MSAA, depth, and compressed textures. */
      if (si_choose_tiling(sctx->screen, &templ, false) != RADEON_SURF_MODE_LINEAR_ALIGNED)
         return;
   }

   new_tex = (struct si_texture *)screen->resource_create(screen, &templ);
   if (!new_tex)
      return;

   /* Copy the pixels to the new texture. */
   if (!invalidate_storage) {
      for (i = 0; i <= templ.last_level; i++) {
         struct pipe_box box;

         u_box_3d(0, 0, 0, u_minify(templ.width0, i), u_minify(templ.height0, i),
                  util_num_layers(&templ, i), &box);

         sctx->dma_copy(&sctx->b, &new_tex->buffer.b.b, i, 0, 0, 0, &tex->buffer.b.b, i, &box);
      }
   }

   if (new_bind_flag == PIPE_BIND_LINEAR) {
      si_texture_discard_cmask(sctx->screen, tex);
      si_texture_discard_dcc(sctx->screen, tex);
   }

   /* Replace the structure fields of tex. */
   tex->buffer.b.b.bind = templ.bind;
   pb_reference(&tex->buffer.buf, new_tex->buffer.buf);
   tex->buffer.gpu_address = new_tex->buffer.gpu_address;
   tex->buffer.vram_usage = new_tex->buffer.vram_usage;
   tex->buffer.gart_usage = new_tex->buffer.gart_usage;
   tex->buffer.bo_size = new_tex->buffer.bo_size;
   tex->buffer.bo_alignment = new_tex->buffer.bo_alignment;
   tex->buffer.domains = new_tex->buffer.domains;
   tex->buffer.flags = new_tex->buffer.flags;

   tex->surface = new_tex->surface;
   si_texture_reference(&tex->flushed_depth_texture, new_tex->flushed_depth_texture);

   tex->surface.fmask_offset = new_tex->surface.fmask_offset;
   tex->surface.cmask_offset = new_tex->surface.cmask_offset;
   tex->cmask_base_address_reg = new_tex->cmask_base_address_reg;

   if (tex->cmask_buffer == &tex->buffer)
      tex->cmask_buffer = NULL;
   else
      si_resource_reference(&tex->cmask_buffer, NULL);

   if (new_tex->cmask_buffer == &new_tex->buffer)
      tex->cmask_buffer = &tex->buffer;
   else
      si_resource_reference(&tex->cmask_buffer, new_tex->cmask_buffer);

   tex->surface.dcc_offset = new_tex->surface.dcc_offset;
   tex->cb_color_info = new_tex->cb_color_info;
   memcpy(tex->color_clear_value, new_tex->color_clear_value, sizeof(tex->color_clear_value));
   tex->last_msaa_resolve_target_micro_mode = new_tex->last_msaa_resolve_target_micro_mode;

   tex->surface.htile_offset = new_tex->surface.htile_offset;
   tex->depth_clear_value = new_tex->depth_clear_value;
   tex->dirty_level_mask = new_tex->dirty_level_mask;
   tex->stencil_dirty_level_mask = new_tex->stencil_dirty_level_mask;
   tex->db_render_format = new_tex->db_render_format;
   tex->stencil_clear_value = new_tex->stencil_clear_value;
   tex->tc_compatible_htile = new_tex->tc_compatible_htile;
   tex->depth_cleared = new_tex->depth_cleared;
   tex->stencil_cleared = new_tex->stencil_cleared;
   tex->upgraded_depth = new_tex->upgraded_depth;
   tex->db_compatible = new_tex->db_compatible;
   tex->can_sample_z = new_tex->can_sample_z;
   tex->can_sample_s = new_tex->can_sample_s;

   tex->separate_dcc_dirty = new_tex->separate_dcc_dirty;
   tex->displayable_dcc_dirty = new_tex->displayable_dcc_dirty;
   tex->dcc_gather_statistics = new_tex->dcc_gather_statistics;
   si_resource_reference(&tex->dcc_separate_buffer, new_tex->dcc_separate_buffer);
   si_resource_reference(&tex->last_dcc_separate_buffer, new_tex->last_dcc_separate_buffer);

   if (new_bind_flag == PIPE_BIND_LINEAR) {
      assert(!tex->surface.htile_offset);
      assert(!tex->cmask_buffer);
      assert(!tex->surface.fmask_size);
      assert(!tex->surface.dcc_offset);
      assert(!tex->is_depth);
   }

   si_texture_reference(&new_tex, NULL);

   p_atomic_inc(&sctx->screen->dirty_tex_counter);
}

static uint32_t si_get_bo_metadata_word1(struct si_screen *sscreen)
{
   return (ATI_VENDOR_ID << 16) | sscreen->info.pci_id;
}

static void si_set_tex_bo_metadata(struct si_screen *sscreen, struct si_texture *tex)
{
   struct radeon_surf *surface = &tex->surface;
   struct pipe_resource *res = &tex->buffer.b.b;
   struct radeon_bo_metadata md;

   memset(&md, 0, sizeof(md));

   if (sscreen->info.chip_class >= GFX9) {
      md.u.gfx9.swizzle_mode = surface->u.gfx9.surf.swizzle_mode;
      md.u.gfx9.scanout = (surface->flags & RADEON_SURF_SCANOUT) != 0;

      if (tex->surface.dcc_offset && !tex->dcc_separate_buffer) {
         uint64_t dcc_offset = tex->surface.display_dcc_offset ? tex->surface.display_dcc_offset
                                                               : tex->surface.dcc_offset;

         assert((dcc_offset >> 8) != 0 && (dcc_offset >> 8) < (1 << 24));
         md.u.gfx9.dcc_offset_256B = dcc_offset >> 8;
         md.u.gfx9.dcc_pitch_max = tex->surface.u.gfx9.display_dcc_pitch_max;
         md.u.gfx9.dcc_independent_64B = tex->surface.u.gfx9.dcc.independent_64B_blocks;
         md.u.gfx9.dcc_independent_128B = tex->surface.u.gfx9.dcc.independent_128B_blocks;
         md.u.gfx9.dcc_max_compressed_block_size = tex->surface.u.gfx9.dcc.max_compressed_block_size;
      }
   } else {
      md.u.legacy.microtile = surface->u.legacy.level[0].mode >= RADEON_SURF_MODE_1D
                                 ? RADEON_LAYOUT_TILED
                                 : RADEON_LAYOUT_LINEAR;
      md.u.legacy.macrotile = surface->u.legacy.level[0].mode >= RADEON_SURF_MODE_2D
                                 ? RADEON_LAYOUT_TILED
                                 : RADEON_LAYOUT_LINEAR;
      md.u.legacy.pipe_config = surface->u.legacy.pipe_config;
      md.u.legacy.bankw = surface->u.legacy.bankw;
      md.u.legacy.bankh = surface->u.legacy.bankh;
      md.u.legacy.tile_split = surface->u.legacy.tile_split;
      md.u.legacy.mtilea = surface->u.legacy.mtilea;
      md.u.legacy.num_banks = surface->u.legacy.num_banks;
      md.u.legacy.stride = surface->u.legacy.level[0].nblk_x * surface->bpe;
      md.u.legacy.scanout = (surface->flags & RADEON_SURF_SCANOUT) != 0;
   }

   assert(tex->dcc_separate_buffer == NULL);
   assert(tex->surface.fmask_size == 0);

   /* Metadata image format format version 1:
    * [0] = 1 (metadata format identifier)
    * [1] = (VENDOR_ID << 16) | PCI_ID
    * [2:9] = image descriptor for the whole resource
    *         [2] is always 0, because the base address is cleared
    *         [9] is the DCC offset bits [39:8] from the beginning of
    *             the buffer
    * [10:10+LAST_LEVEL] = mipmap level offset bits [39:8] for each level
    */

   md.metadata[0] = 1; /* metadata image format version 1 */

   /* TILE_MODE_INDEX is ambiguous without a PCI ID. */
   md.metadata[1] = si_get_bo_metadata_word1(sscreen);

   static const unsigned char swizzle[] = {PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y, PIPE_SWIZZLE_Z,
                                           PIPE_SWIZZLE_W};
   bool is_array = util_texture_is_array(res->target);
   uint32_t desc[8];

   sscreen->make_texture_descriptor(sscreen, tex, true, res->target, res->format, swizzle, 0,
                                    res->last_level, 0, is_array ? res->array_size - 1 : 0,
                                    res->width0, res->height0, res->depth0, desc, NULL);

   si_set_mutable_tex_desc_fields(sscreen, tex, &tex->surface.u.legacy.level[0], 0, 0,
                                  tex->surface.blk_w, false, false, desc);

   /* Clear the base address and set the relative DCC offset. */
   desc[0] = 0;
   desc[1] &= C_008F14_BASE_ADDRESS_HI;

   switch (sscreen->info.chip_class) {
   case GFX6:
   case GFX7:
      break;
   case GFX8:
      desc[7] = tex->surface.dcc_offset >> 8;
      break;
   case GFX9:
      desc[7] = tex->surface.dcc_offset >> 8;
      desc[5] &= C_008F24_META_DATA_ADDRESS;
      desc[5] |= S_008F24_META_DATA_ADDRESS(tex->surface.dcc_offset >> 40);
      break;
   case GFX10:
      desc[6] &= C_00A018_META_DATA_ADDRESS_LO;
      desc[6] |= S_00A018_META_DATA_ADDRESS_LO(tex->surface.dcc_offset >> 8);
      desc[7] = tex->surface.dcc_offset >> 16;
      break;
   default:
      assert(0);
   }

   /* Dwords [2:9] contain the image descriptor. */
   memcpy(&md.metadata[2], desc, sizeof(desc));
   md.size_metadata = 10 * 4;

   /* Dwords [10:..] contain the mipmap level offsets. */
   if (sscreen->info.chip_class <= GFX8) {
      for (unsigned i = 0; i <= res->last_level; i++)
         md.metadata[10 + i] = tex->surface.u.legacy.level[i].offset >> 8;

      md.size_metadata += (1 + res->last_level) * 4;
   }

   sscreen->ws->buffer_set_metadata(tex->buffer.buf, &md);
}

static bool si_read_tex_bo_metadata(struct si_screen *sscreen, struct si_texture *tex,
                                    uint64_t offset, struct radeon_bo_metadata *md)
{
   uint32_t *desc = &md->metadata[2];

   if (offset ||                     /* Non-zero planes ignore metadata. */
       md->size_metadata < 10 * 4 || /* at least 2(header) + 8(desc) dwords */
       md->metadata[0] == 0 ||       /* invalid version number */
       md->metadata[1] != si_get_bo_metadata_word1(sscreen)) /* invalid PCI ID */ {
      /* Disable DCC because it might not be enabled. */
      si_texture_zero_dcc_fields(tex);

      /* Don't report an error if the texture comes from an incompatible driver,
       * but this might not work.
       */
      return true;
   }

   /* Validate that sample counts and the number of mipmap levels match. */
   unsigned last_level = G_008F1C_LAST_LEVEL(desc[3]);
   unsigned type = G_008F1C_TYPE(desc[3]);

   if (type == V_008F1C_SQ_RSRC_IMG_2D_MSAA || type == V_008F1C_SQ_RSRC_IMG_2D_MSAA_ARRAY) {
      unsigned log_samples = util_logbase2(MAX2(1, tex->buffer.b.b.nr_storage_samples));

      if (last_level != log_samples) {
         fprintf(stderr,
                 "radeonsi: invalid MSAA texture import, "
                 "metadata has log2(samples) = %u, the caller set %u\n",
                 last_level, log_samples);
         return false;
      }
   } else {
      if (last_level != tex->buffer.b.b.last_level) {
         fprintf(stderr,
                 "radeonsi: invalid mipmapped texture import, "
                 "metadata has last_level = %u, the caller set %u\n",
                 last_level, tex->buffer.b.b.last_level);
         return false;
      }
   }

   if (sscreen->info.chip_class >= GFX8 && G_008F28_COMPRESSION_EN(desc[6])) {
      /* Read DCC information. */
      switch (sscreen->info.chip_class) {
      case GFX8:
         tex->surface.dcc_offset = (uint64_t)desc[7] << 8;
         break;

      case GFX9:
         tex->surface.dcc_offset =
            ((uint64_t)desc[7] << 8) | ((uint64_t)G_008F24_META_DATA_ADDRESS(desc[5]) << 40);
         tex->surface.u.gfx9.dcc.pipe_aligned = G_008F24_META_PIPE_ALIGNED(desc[5]);
         tex->surface.u.gfx9.dcc.rb_aligned = G_008F24_META_RB_ALIGNED(desc[5]);

         /* If DCC is unaligned, this can only be a displayable image. */
         if (!tex->surface.u.gfx9.dcc.pipe_aligned && !tex->surface.u.gfx9.dcc.rb_aligned)
            assert(tex->surface.is_displayable);
         break;

      case GFX10:
         tex->surface.dcc_offset =
            ((uint64_t)G_00A018_META_DATA_ADDRESS_LO(desc[6]) << 8) | ((uint64_t)desc[7] << 16);
         tex->surface.u.gfx9.dcc.pipe_aligned = G_00A018_META_PIPE_ALIGNED(desc[6]);
         break;

      default:
         assert(0);
         return false;
      }
   } else {
      /* Disable DCC. dcc_offset is always set by texture_from_handle
       * and must be cleared here.
       */
      si_texture_zero_dcc_fields(tex);
   }

   return true;
}

static bool si_has_displayable_dcc(struct si_texture *tex)
{
   struct si_screen *sscreen = (struct si_screen *)tex->buffer.b.b.screen;

   if (sscreen->info.chip_class <= GFX8)
      return false;

   return tex->surface.is_displayable && tex->surface.dcc_offset;
}

static bool si_resource_get_param(struct pipe_screen *screen, struct pipe_context *context,
                                  struct pipe_resource *resource, unsigned plane, unsigned layer,
                                  enum pipe_resource_param param, unsigned handle_usage,
                                  uint64_t *value)
{
   for (unsigned i = 0; i < plane; i++)
      resource = resource->next;

   struct si_screen *sscreen = (struct si_screen *)screen;
   struct si_texture *tex = (struct si_texture *)resource;
   struct winsys_handle whandle;

   switch (param) {
   case PIPE_RESOURCE_PARAM_NPLANES:
      *value = resource->target == PIPE_BUFFER ? 1 : tex->num_planes;
      return true;

   case PIPE_RESOURCE_PARAM_STRIDE:
      if (resource->target == PIPE_BUFFER)
         *value = 0;
      else if (sscreen->info.chip_class >= GFX9)
         *value = tex->surface.u.gfx9.surf_pitch * tex->surface.bpe;
      else
         *value = tex->surface.u.legacy.level[0].nblk_x * tex->surface.bpe;
      return true;

   case PIPE_RESOURCE_PARAM_OFFSET:
      if (resource->target == PIPE_BUFFER)
         *value = 0;
      else if (sscreen->info.chip_class >= GFX9)
         *value = tex->surface.u.gfx9.surf_offset + layer * tex->surface.u.gfx9.surf_slice_size;
      else
         *value = tex->surface.u.legacy.level[0].offset +
                  layer * (uint64_t)tex->surface.u.legacy.level[0].slice_size_dw * 4;
      return true;

   case PIPE_RESOURCE_PARAM_MODIFIER:
      *value = DRM_FORMAT_MOD_INVALID;
      return true;

   case PIPE_RESOURCE_PARAM_HANDLE_TYPE_SHARED:
   case PIPE_RESOURCE_PARAM_HANDLE_TYPE_KMS:
   case PIPE_RESOURCE_PARAM_HANDLE_TYPE_FD:
      memset(&whandle, 0, sizeof(whandle));

      if (param == PIPE_RESOURCE_PARAM_HANDLE_TYPE_SHARED)
         whandle.type = WINSYS_HANDLE_TYPE_SHARED;
      else if (param == PIPE_RESOURCE_PARAM_HANDLE_TYPE_KMS)
         whandle.type = WINSYS_HANDLE_TYPE_KMS;
      else if (param == PIPE_RESOURCE_PARAM_HANDLE_TYPE_FD)
         whandle.type = WINSYS_HANDLE_TYPE_FD;

      if (!screen->resource_get_handle(screen, context, resource, &whandle, handle_usage))
         return false;

      *value = whandle.handle;
      return true;
   }
   return false;
}

static void si_texture_get_info(struct pipe_screen *screen, struct pipe_resource *resource,
                                unsigned *pstride, unsigned *poffset)
{
   uint64_t value;

   if (pstride) {
      si_resource_get_param(screen, NULL, resource, 0, 0, PIPE_RESOURCE_PARAM_STRIDE, 0, &value);
      *pstride = value;
   }

   if (poffset) {
      si_resource_get_param(screen, NULL, resource, 0, 0, PIPE_RESOURCE_PARAM_OFFSET, 0, &value);
      *poffset = value;
   }
}

static bool si_texture_get_handle(struct pipe_screen *screen, struct pipe_context *ctx,
                                  struct pipe_resource *resource, struct winsys_handle *whandle,
                                  unsigned usage)
{
   struct si_screen *sscreen = (struct si_screen *)screen;
   struct si_context *sctx;
   struct si_resource *res = si_resource(resource);
   struct si_texture *tex = (struct si_texture *)resource;
   bool update_metadata = false;
   unsigned stride, offset, slice_size;
   bool flush = false;

   ctx = threaded_context_unwrap_sync(ctx);
   sctx = (struct si_context *)(ctx ? ctx : sscreen->aux_context);

   if (resource->target != PIPE_BUFFER) {
      /* Individual planes are chained pipe_resource instances. */
      for (unsigned i = 0; i < whandle->plane; i++) {
         resource = resource->next;
         res = si_resource(resource);
         tex = (struct si_texture *)resource;
      }

      /* This is not supported now, but it might be required for OpenCL
       * interop in the future.
       */
      if (resource->nr_samples > 1 || tex->is_depth)
         return false;

      /* Move a suballocated texture into a non-suballocated allocation. */
      if (sscreen->ws->buffer_is_suballocated(res->buf) || tex->surface.tile_swizzle ||
          (tex->buffer.flags & RADEON_FLAG_NO_INTERPROCESS_SHARING &&
           sscreen->info.has_local_buffers)) {
         assert(!res->b.is_shared);
         si_reallocate_texture_inplace(sctx, tex, PIPE_BIND_SHARED, false);
         flush = true;
         assert(res->b.b.bind & PIPE_BIND_SHARED);
         assert(res->flags & RADEON_FLAG_NO_SUBALLOC);
         assert(!(res->flags & RADEON_FLAG_NO_INTERPROCESS_SHARING));
         assert(tex->surface.tile_swizzle == 0);
      }

      /* Since shader image stores don't support DCC on GFX8,
       * disable it for external clients that want write
       * access.
       */
      if ((usage & PIPE_HANDLE_USAGE_SHADER_WRITE && tex->surface.dcc_offset) ||
          /* Displayable DCC requires an explicit flush. */
          (!(usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH) && si_has_displayable_dcc(tex))) {
         if (si_texture_disable_dcc(sctx, tex)) {
            update_metadata = true;
            /* si_texture_disable_dcc flushes the context */
            flush = false;
         }
      }

      if (!(usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH) &&
          (tex->cmask_buffer || tex->surface.dcc_offset)) {
         /* Eliminate fast clear (both CMASK and DCC) */
         si_eliminate_fast_color_clear(sctx, tex);
         /* eliminate_fast_color_clear flushes the context */
         flush = false;

         /* Disable CMASK if flush_resource isn't going
          * to be called.
          */
         if (tex->cmask_buffer)
            si_texture_discard_cmask(sscreen, tex);
      }

      /* Set metadata. */
      if ((!res->b.is_shared || update_metadata) && whandle->offset == 0)
         si_set_tex_bo_metadata(sscreen, tex);

      if (sscreen->info.chip_class >= GFX9) {
         slice_size = tex->surface.u.gfx9.surf_slice_size;
      } else {
         slice_size = (uint64_t)tex->surface.u.legacy.level[0].slice_size_dw * 4;
      }
   } else {
      /* Buffer exports are for the OpenCL interop. */
      /* Move a suballocated buffer into a non-suballocated allocation. */
      if (sscreen->ws->buffer_is_suballocated(res->buf) ||
          /* A DMABUF export always fails if the BO is local. */
          (tex->buffer.flags & RADEON_FLAG_NO_INTERPROCESS_SHARING &&
           sscreen->info.has_local_buffers)) {
         assert(!res->b.is_shared);

         /* Allocate a new buffer with PIPE_BIND_SHARED. */
         struct pipe_resource templ = res->b.b;
         templ.bind |= PIPE_BIND_SHARED;

         struct pipe_resource *newb = screen->resource_create(screen, &templ);
         if (!newb)
            return false;

         /* Copy the old buffer contents to the new one. */
         struct pipe_box box;
         u_box_1d(0, newb->width0, &box);
         sctx->b.resource_copy_region(&sctx->b, newb, 0, 0, 0, 0, &res->b.b, 0, &box);
         flush = true;
         /* Move the new buffer storage to the old pipe_resource. */
         si_replace_buffer_storage(&sctx->b, &res->b.b, newb);
         pipe_resource_reference(&newb, NULL);

         assert(res->b.b.bind & PIPE_BIND_SHARED);
         assert(res->flags & RADEON_FLAG_NO_SUBALLOC);
      }

      /* Buffers */
      slice_size = 0;
   }

   si_texture_get_info(screen, resource, &stride, &offset);

   if (flush)
      sctx->b.flush(&sctx->b, NULL, 0);

   if (res->b.is_shared) {
      /* USAGE_EXPLICIT_FLUSH must be cleared if at least one user
       * doesn't set it.
       */
      res->external_usage |= usage & ~PIPE_HANDLE_USAGE_EXPLICIT_FLUSH;
      if (!(usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH))
         res->external_usage &= ~PIPE_HANDLE_USAGE_EXPLICIT_FLUSH;
   } else {
      res->b.is_shared = true;
      res->external_usage = usage;
   }

   whandle->stride = stride;
   whandle->offset = offset + slice_size * whandle->layer;

   return sscreen->ws->buffer_get_handle(sscreen->ws, res->buf, whandle);
}

static void si_texture_destroy(struct pipe_screen *screen, struct pipe_resource *ptex)
{
   struct si_screen *sscreen = (struct si_screen *)screen;
   struct si_texture *tex = (struct si_texture *)ptex;
   struct si_resource *resource = &tex->buffer;

   if (sscreen->info.chip_class >= GFX9)
      free(tex->surface.u.gfx9.dcc_retile_map);

   si_texture_reference(&tex->flushed_depth_texture, NULL);

   if (tex->cmask_buffer != &tex->buffer) {
      si_resource_reference(&tex->cmask_buffer, NULL);
   }
   pb_reference(&resource->buf, NULL);
   si_resource_reference(&tex->dcc_separate_buffer, NULL);
   si_resource_reference(&tex->last_dcc_separate_buffer, NULL);
   FREE(tex);
}

static const struct u_resource_vtbl si_texture_vtbl;

void si_print_texture_info(struct si_screen *sscreen, struct si_texture *tex,
                           struct u_log_context *log)
{
   int i;

   /* Common parameters. */
   u_log_printf(log,
                "  Info: npix_x=%u, npix_y=%u, npix_z=%u, blk_w=%u, "
                "blk_h=%u, array_size=%u, last_level=%u, "
                "bpe=%u, nsamples=%u, flags=0x%x, %s\n",
                tex->buffer.b.b.width0, tex->buffer.b.b.height0, tex->buffer.b.b.depth0,
                tex->surface.blk_w, tex->surface.blk_h, tex->buffer.b.b.array_size,
                tex->buffer.b.b.last_level, tex->surface.bpe, tex->buffer.b.b.nr_samples,
                tex->surface.flags, util_format_short_name(tex->buffer.b.b.format));

   if (sscreen->info.chip_class >= GFX9) {
      u_log_printf(log,
                   "  Surf: size=%" PRIu64 ", slice_size=%" PRIu64 ", "
                   "alignment=%u, swmode=%u, epitch=%u, pitch=%u\n",
                   tex->surface.surf_size, tex->surface.u.gfx9.surf_slice_size,
                   tex->surface.surf_alignment, tex->surface.u.gfx9.surf.swizzle_mode,
                   tex->surface.u.gfx9.surf.epitch, tex->surface.u.gfx9.surf_pitch);

      if (tex->surface.fmask_offset) {
         u_log_printf(log,
                      "  FMASK: offset=%" PRIu64 ", size=%" PRIu64 ", "
                      "alignment=%u, swmode=%u, epitch=%u\n",
                      tex->surface.fmask_offset, tex->surface.fmask_size,
                      tex->surface.fmask_alignment, tex->surface.u.gfx9.fmask.swizzle_mode,
                      tex->surface.u.gfx9.fmask.epitch);
      }

      if (tex->cmask_buffer) {
         u_log_printf(log,
                      "  CMask: offset=%" PRIu64 ", size=%u, "
                      "alignment=%u, rb_aligned=%u, pipe_aligned=%u\n",
                      tex->surface.cmask_offset, tex->surface.cmask_size,
                      tex->surface.cmask_alignment, tex->surface.u.gfx9.cmask.rb_aligned,
                      tex->surface.u.gfx9.cmask.pipe_aligned);
      }

      if (tex->surface.htile_offset) {
         u_log_printf(log,
                      "  HTile: offset=%" PRIu64 ", size=%u, alignment=%u, "
                      "rb_aligned=%u, pipe_aligned=%u\n",
                      tex->surface.htile_offset, tex->surface.htile_size,
                      tex->surface.htile_alignment, tex->surface.u.gfx9.htile.rb_aligned,
                      tex->surface.u.gfx9.htile.pipe_aligned);
      }

      if (tex->surface.dcc_offset) {
         u_log_printf(log,
                      "  DCC: offset=%" PRIu64 ", size=%u, "
                      "alignment=%u, pitch_max=%u, num_dcc_levels=%u\n",
                      tex->surface.dcc_offset, tex->surface.dcc_size, tex->surface.dcc_alignment,
                      tex->surface.u.gfx9.display_dcc_pitch_max, tex->surface.num_dcc_levels);
      }

      if (tex->surface.u.gfx9.stencil_offset) {
         u_log_printf(log, "  Stencil: offset=%" PRIu64 ", swmode=%u, epitch=%u\n",
                      tex->surface.u.gfx9.stencil_offset, tex->surface.u.gfx9.stencil.swizzle_mode,
                      tex->surface.u.gfx9.stencil.epitch);
      }
      return;
   }

   u_log_printf(log,
                "  Layout: size=%" PRIu64 ", alignment=%u, bankw=%u, "
                "bankh=%u, nbanks=%u, mtilea=%u, tilesplit=%u, pipeconfig=%u, scanout=%u\n",
                tex->surface.surf_size, tex->surface.surf_alignment, tex->surface.u.legacy.bankw,
                tex->surface.u.legacy.bankh, tex->surface.u.legacy.num_banks,
                tex->surface.u.legacy.mtilea, tex->surface.u.legacy.tile_split,
                tex->surface.u.legacy.pipe_config, (tex->surface.flags & RADEON_SURF_SCANOUT) != 0);

   if (tex->surface.fmask_offset)
      u_log_printf(
         log,
         "  FMask: offset=%" PRIu64 ", size=%" PRIu64 ", alignment=%u, pitch_in_pixels=%u, "
         "bankh=%u, slice_tile_max=%u, tile_mode_index=%u\n",
         tex->surface.fmask_offset, tex->surface.fmask_size, tex->surface.fmask_alignment,
         tex->surface.u.legacy.fmask.pitch_in_pixels, tex->surface.u.legacy.fmask.bankh,
         tex->surface.u.legacy.fmask.slice_tile_max, tex->surface.u.legacy.fmask.tiling_index);

   if (tex->cmask_buffer)
      u_log_printf(log,
                   "  CMask: offset=%" PRIu64 ", size=%u, alignment=%u, "
                   "slice_tile_max=%u\n",
                   tex->surface.cmask_offset, tex->surface.cmask_size, tex->surface.cmask_alignment,
                   tex->surface.u.legacy.cmask_slice_tile_max);

   if (tex->surface.htile_offset)
      u_log_printf(log,
                   "  HTile: offset=%" PRIu64 ", size=%u, "
                   "alignment=%u, TC_compatible = %u\n",
                   tex->surface.htile_offset, tex->surface.htile_size, tex->surface.htile_alignment,
                   tex->tc_compatible_htile);

   if (tex->surface.dcc_offset) {
      u_log_printf(log, "  DCC: offset=%" PRIu64 ", size=%u, alignment=%u\n",
                   tex->surface.dcc_offset, tex->surface.dcc_size, tex->surface.dcc_alignment);
      for (i = 0; i <= tex->buffer.b.b.last_level; i++)
         u_log_printf(log,
                      "  DCCLevel[%i]: enabled=%u, offset=%u, "
                      "fast_clear_size=%u\n",
                      i, i < tex->surface.num_dcc_levels, tex->surface.u.legacy.level[i].dcc_offset,
                      tex->surface.u.legacy.level[i].dcc_fast_clear_size);
   }

   for (i = 0; i <= tex->buffer.b.b.last_level; i++)
      u_log_printf(log,
                   "  Level[%i]: offset=%" PRIu64 ", slice_size=%" PRIu64 ", "
                   "npix_x=%u, npix_y=%u, npix_z=%u, nblk_x=%u, nblk_y=%u, "
                   "mode=%u, tiling_index = %u\n",
                   i, tex->surface.u.legacy.level[i].offset,
                   (uint64_t)tex->surface.u.legacy.level[i].slice_size_dw * 4,
                   u_minify(tex->buffer.b.b.width0, i), u_minify(tex->buffer.b.b.height0, i),
                   u_minify(tex->buffer.b.b.depth0, i), tex->surface.u.legacy.level[i].nblk_x,
                   tex->surface.u.legacy.level[i].nblk_y, tex->surface.u.legacy.level[i].mode,
                   tex->surface.u.legacy.tiling_index[i]);

   if (tex->surface.has_stencil) {
      u_log_printf(log, "  StencilLayout: tilesplit=%u\n",
                   tex->surface.u.legacy.stencil_tile_split);
      for (i = 0; i <= tex->buffer.b.b.last_level; i++) {
         u_log_printf(log,
                      "  StencilLevel[%i]: offset=%" PRIu64 ", "
                      "slice_size=%" PRIu64 ", npix_x=%u, "
                      "npix_y=%u, npix_z=%u, nblk_x=%u, nblk_y=%u, "
                      "mode=%u, tiling_index = %u\n",
                      i, tex->surface.u.legacy.stencil_level[i].offset,
                      (uint64_t)tex->surface.u.legacy.stencil_level[i].slice_size_dw * 4,
                      u_minify(tex->buffer.b.b.width0, i), u_minify(tex->buffer.b.b.height0, i),
                      u_minify(tex->buffer.b.b.depth0, i),
                      tex->surface.u.legacy.stencil_level[i].nblk_x,
                      tex->surface.u.legacy.stencil_level[i].nblk_y,
                      tex->surface.u.legacy.stencil_level[i].mode,
                      tex->surface.u.legacy.stencil_tiling_index[i]);
      }
   }
}

/**
 * Common function for si_texture_create and si_texture_from_handle.
 *
 * \param screen        screen
 * \param base          resource template
 * \param surface       radeon_surf
 * \param plane0        if a non-zero plane is being created, this is the first plane
 * \param imported_buf  from si_texture_from_handle
 * \param offset        offset for non-zero planes or imported buffers
 * \param alloc_size    the size to allocate if plane0 != NULL
 * \param alignment     alignment for the allocation
 */
static struct si_texture *si_texture_create_object(struct pipe_screen *screen,
                                                   const struct pipe_resource *base,
                                                   const struct radeon_surf *surface,
                                                   const struct si_texture *plane0,
                                                   struct pb_buffer *imported_buf, uint64_t offset,
                                                   uint64_t alloc_size, unsigned alignment)
{
   struct si_texture *tex;
   struct si_resource *resource;
   struct si_screen *sscreen = (struct si_screen *)screen;

   tex = CALLOC_STRUCT(si_texture);
   if (!tex)
      goto error;

   resource = &tex->buffer;
   resource->b.b = *base;
   resource->b.vtbl = &si_texture_vtbl;
   pipe_reference_init(&resource->b.b.reference, 1);
   resource->b.b.screen = screen;

   /* don't include stencil-only formats which we don't support for rendering */
   tex->is_depth = util_format_has_depth(util_format_description(tex->buffer.b.b.format));
   tex->surface = *surface;
   tex->tc_compatible_htile = false; /* This will be enabled on demand. */

   /* TC-compatible HTILE:
    * - GFX8 only supports Z32_FLOAT.
    * - GFX9 only supports Z32_FLOAT and Z16_UNORM. */
   if (tex->surface.flags & RADEON_SURF_TC_COMPATIBLE_HTILE) {
      if (sscreen->info.chip_class >= GFX9 && base->format == PIPE_FORMAT_Z16_UNORM)
         tex->db_render_format = base->format;
      else {
         tex->db_render_format = PIPE_FORMAT_Z32_FLOAT;
         tex->upgraded_depth = base->format != PIPE_FORMAT_Z32_FLOAT &&
                               base->format != PIPE_FORMAT_Z32_FLOAT_S8X24_UINT;
      }
   } else {
      tex->db_render_format = base->format;
   }

   /* Applies to GCN. */
   tex->last_msaa_resolve_target_micro_mode = tex->surface.micro_tile_mode;

   /* Disable separate DCC at the beginning. DRI2 doesn't reuse buffers
    * between frames, so the only thing that can enable separate DCC
    * with DRI2 is multiple slow clears within a frame.
    */
   tex->ps_draw_ratio = 0;

   if (sscreen->info.chip_class >= GFX9) {
      tex->surface.u.gfx9.surf_offset = offset;
   } else {
      for (unsigned i = 0; i < ARRAY_SIZE(surface->u.legacy.level); ++i)
         tex->surface.u.legacy.level[i].offset += offset;
   }

   if (tex->is_depth) {
      if (sscreen->info.chip_class >= GFX9) {
         tex->can_sample_z = true;
         tex->can_sample_s = true;

         /* Stencil texturing with HTILE doesn't work
          * with mipmapping on Navi10-14. */
         if (sscreen->info.chip_class == GFX10 && base->last_level > 0)
            tex->htile_stencil_disabled = true;
      } else {
         tex->can_sample_z = !tex->surface.u.legacy.depth_adjusted;
         tex->can_sample_s = !tex->surface.u.legacy.stencil_adjusted;
      }

      tex->db_compatible = surface->flags & RADEON_SURF_ZBUFFER;
   } else {
      if (tex->surface.cmask_offset) {
         tex->cb_color_info |= S_028C70_FAST_CLEAR(1);
         tex->cmask_buffer = &tex->buffer;
      }
   }

   if (plane0) {
      /* The buffer is shared with the first plane. */
      resource->bo_size = plane0->buffer.bo_size;
      resource->bo_alignment = plane0->buffer.bo_alignment;
      resource->flags = plane0->buffer.flags;
      resource->domains = plane0->buffer.domains;
      resource->vram_usage = plane0->buffer.vram_usage;
      resource->gart_usage = plane0->buffer.gart_usage;

      pb_reference(&resource->buf, plane0->buffer.buf);
      resource->gpu_address = plane0->buffer.gpu_address;
   } else if (!(surface->flags & RADEON_SURF_IMPORTED)) {
      /* Create the backing buffer. */
      si_init_resource_fields(sscreen, resource, alloc_size, alignment);

      if (!si_alloc_resource(sscreen, resource))
         goto error;
   } else {
      resource->buf = imported_buf;
      resource->gpu_address = sscreen->ws->buffer_get_virtual_address(resource->buf);
      resource->bo_size = imported_buf->size;
      resource->bo_alignment = imported_buf->alignment;
      resource->domains = sscreen->ws->buffer_get_initial_domain(resource->buf);
      if (resource->domains & RADEON_DOMAIN_VRAM)
         resource->vram_usage = resource->bo_size;
      else if (resource->domains & RADEON_DOMAIN_GTT)
         resource->gart_usage = resource->bo_size;
      if (sscreen->ws->buffer_get_flags)
         resource->flags = sscreen->ws->buffer_get_flags(resource->buf);
   }

   if (tex->cmask_buffer) {
      /* Initialize the cmask to 0xCC (= compressed state). */
      si_screen_clear_buffer(sscreen, &tex->cmask_buffer->b.b, tex->surface.cmask_offset,
                             tex->surface.cmask_size, 0xCCCCCCCC);
   }
   if (tex->surface.htile_offset) {
      uint32_t clear_value = 0;

      if (sscreen->info.chip_class >= GFX9 || tex->tc_compatible_htile)
         clear_value = 0x0000030F;

      si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.htile_offset,
                             tex->surface.htile_size, clear_value);
   }

   /* Initialize DCC only if the texture is not being imported. */
   if (!(surface->flags & RADEON_SURF_IMPORTED) && tex->surface.dcc_offset) {
      /* Clear DCC to black for all tiles with DCC enabled.
       *
       * This fixes corruption in 3DMark Slingshot Extreme, which
       * uses uninitialized textures, causing corruption.
       */
      if (tex->surface.num_dcc_levels == tex->buffer.b.b.last_level + 1 &&
          tex->buffer.b.b.nr_samples <= 2) {
         /* Simple case - all tiles have DCC enabled. */
         si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.dcc_offset,
                                tex->surface.dcc_size, DCC_CLEAR_COLOR_0000);
      } else if (sscreen->info.chip_class >= GFX9) {
         /* Clear to uncompressed. Clearing this to black is complicated. */
         si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.dcc_offset,
                                tex->surface.dcc_size, DCC_UNCOMPRESSED);
      } else {
         /* GFX8: Initialize mipmap levels and multisamples separately. */
         if (tex->buffer.b.b.nr_samples >= 2) {
            /* Clearing this to black is complicated. */
            si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.dcc_offset,
                                   tex->surface.dcc_size, DCC_UNCOMPRESSED);
         } else {
            /* Clear the enabled mipmap levels to black. */
            unsigned size = 0;

            for (unsigned i = 0; i < tex->surface.num_dcc_levels; i++) {
               if (!tex->surface.u.legacy.level[i].dcc_fast_clear_size)
                  break;

               size = tex->surface.u.legacy.level[i].dcc_offset +
                      tex->surface.u.legacy.level[i].dcc_fast_clear_size;
            }

            /* Mipmap levels with DCC. */
            if (size) {
               si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.dcc_offset, size,
                                      DCC_CLEAR_COLOR_0000);
            }
            /* Mipmap levels without DCC. */
            if (size != tex->surface.dcc_size) {
               si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.dcc_offset + size,
                                      tex->surface.dcc_size - size, DCC_UNCOMPRESSED);
            }
         }
      }

      /* Initialize displayable DCC that requires the retile blit. */
      if (tex->surface.dcc_retile_map_offset) {
         /* Uninitialized DCC can hang the display hw.
          * Clear to white to indicate that. */
         si_screen_clear_buffer(sscreen, &tex->buffer.b.b, tex->surface.display_dcc_offset,
                                tex->surface.u.gfx9.display_dcc_size, DCC_CLEAR_COLOR_1111);

         /* Upload the DCC retile map.
          * Use a staging buffer for the upload, because
          * the buffer backing the texture is unmappable.
          */
         bool use_uint16 = tex->surface.u.gfx9.dcc_retile_use_uint16;
         unsigned num_elements = tex->surface.u.gfx9.dcc_retile_num_elements;
         struct si_resource *buf = si_aligned_buffer_create(screen, 0, PIPE_USAGE_STREAM,
                                                            num_elements * (use_uint16 ? 2 : 4),
                                                            sscreen->info.tcc_cache_line_size);
         uint32_t *ui = (uint32_t *)sscreen->ws->buffer_map(buf->buf, NULL, PIPE_TRANSFER_WRITE);
         uint16_t *us = (uint16_t *)ui;

         /* Upload the retile map into a staging buffer. */
         if (use_uint16) {
            for (unsigned i = 0; i < num_elements; i++)
               us[i] = tex->surface.u.gfx9.dcc_retile_map[i];
         } else {
            for (unsigned i = 0; i < num_elements; i++)
               ui[i] = tex->surface.u.gfx9.dcc_retile_map[i];
         }

         /* Copy the staging buffer to the buffer backing the texture. */
         struct si_context *sctx = (struct si_context *)sscreen->aux_context;

         assert(tex->surface.dcc_retile_map_offset <= UINT_MAX);
         simple_mtx_lock(&sscreen->aux_context_lock);
         si_sdma_copy_buffer(sctx, &tex->buffer.b.b, &buf->b.b, tex->surface.dcc_retile_map_offset,
                             0, buf->b.b.width0);
         sscreen->aux_context->flush(sscreen->aux_context, NULL, 0);
         simple_mtx_unlock(&sscreen->aux_context_lock);

         si_resource_reference(&buf, NULL);
      }
   }

   /* Initialize the CMASK base register value. */
   tex->cmask_base_address_reg = (tex->buffer.gpu_address + tex->surface.cmask_offset) >> 8;

   if (sscreen->debug_flags & DBG(VM)) {
      fprintf(stderr,
              "VM start=0x%" PRIX64 "  end=0x%" PRIX64
              " | Texture %ix%ix%i, %i levels, %i samples, %s\n",
              tex->buffer.gpu_address, tex->buffer.gpu_address + tex->buffer.buf->size,
              base->width0, base->height0, util_num_layers(base, 0), base->last_level + 1,
              base->nr_samples ? base->nr_samples : 1, util_format_short_name(base->format));
   }

   if (sscreen->debug_flags & DBG(TEX)) {
      puts("Texture:");
      struct u_log_context log;
      u_log_context_init(&log);
      si_print_texture_info(sscreen, tex, &log);
      u_log_new_page_print(&log, stdout);
      fflush(stdout);
      u_log_context_destroy(&log);
   }

   return tex;

error:
   FREE(tex);
   if (sscreen->info.chip_class >= GFX9)
      free(surface->u.gfx9.dcc_retile_map);
   return NULL;
}

static enum radeon_surf_mode si_choose_tiling(struct si_screen *sscreen,
                                              const struct pipe_resource *templ,
                                              bool tc_compatible_htile)
{
   const struct util_format_description *desc = util_format_description(templ->format);
   bool force_tiling = templ->flags & SI_RESOURCE_FLAG_FORCE_MSAA_TILING;
   bool is_depth_stencil = util_format_is_depth_or_stencil(templ->format) &&
                           !(templ->flags & SI_RESOURCE_FLAG_FLUSHED_DEPTH);

   /* MSAA resources must be 2D tiled. */
   if (templ->nr_samples > 1)
      return RADEON_SURF_MODE_2D;

   /* Transfer resources should be linear. */
   if (templ->flags & SI_RESOURCE_FLAG_TRANSFER)
      return RADEON_SURF_MODE_LINEAR_ALIGNED;

   /* Avoid Z/S decompress blits by forcing TC-compatible HTILE on GFX8,
    * which requires 2D tiling.
    */
   if (sscreen->info.chip_class == GFX8 && tc_compatible_htile)
      return RADEON_SURF_MODE_2D;

   /* Handle common candidates for the linear mode.
    * Compressed textures and DB surfaces must always be tiled.
    */
   if (!force_tiling && !is_depth_stencil && !util_format_is_compressed(templ->format)) {
      if (sscreen->debug_flags & DBG(NO_TILING))
         return RADEON_SURF_MODE_LINEAR_ALIGNED;

      /* Tiling doesn't work with the 422 (SUBSAMPLED) formats. */
      if (desc->layout == UTIL_FORMAT_LAYOUT_SUBSAMPLED)
         return RADEON_SURF_MODE_LINEAR_ALIGNED;

      /* Cursors are linear on AMD GCN.
       * (XXX double-check, maybe also use RADEON_SURF_SCANOUT) */
      if (templ->bind & PIPE_BIND_CURSOR)
         return RADEON_SURF_MODE_LINEAR_ALIGNED;

      if (templ->bind & PIPE_BIND_LINEAR)
         return RADEON_SURF_MODE_LINEAR_ALIGNED;

      /* Textures with a very small height are recommended to be linear. */
      if (templ->target == PIPE_TEXTURE_1D || templ->target == PIPE_TEXTURE_1D_ARRAY ||
          /* Only very thin and long 2D textures should benefit from
           * linear_aligned. */
          (templ->width0 > 8 && templ->height0 <= 2))
         return RADEON_SURF_MODE_LINEAR_ALIGNED;

      /* Textures likely to be mapped often. */
      if (templ->usage == PIPE_USAGE_STAGING || templ->usage == PIPE_USAGE_STREAM)
         return RADEON_SURF_MODE_LINEAR_ALIGNED;
   }

   /* Make small textures 1D tiled. */
   if (templ->width0 <= 16 || templ->height0 <= 16 || (sscreen->debug_flags & DBG(NO_2D_TILING)))
      return RADEON_SURF_MODE_1D;

   /* The allocator will switch to 1D if needed. */
   return RADEON_SURF_MODE_2D;
}

struct pipe_resource *si_texture_create(struct pipe_screen *screen,
                                        const struct pipe_resource *templ)
{
   struct si_screen *sscreen = (struct si_screen *)screen;
   bool is_zs = util_format_is_depth_or_stencil(templ->format);

   if (templ->nr_samples >= 2) {
      /* This is hackish (overwriting the const pipe_resource template),
       * but should be harmless and state trackers can also see
       * the overriden number of samples in the created pipe_resource.
       */
      if (is_zs && sscreen->eqaa_force_z_samples) {
         ((struct pipe_resource *)templ)->nr_samples =
            ((struct pipe_resource *)templ)->nr_storage_samples = sscreen->eqaa_force_z_samples;
      } else if (!is_zs && sscreen->eqaa_force_color_samples) {
         ((struct pipe_resource *)templ)->nr_samples = sscreen->eqaa_force_coverage_samples;
         ((struct pipe_resource *)templ)->nr_storage_samples = sscreen->eqaa_force_color_samples;
      }
   }

   bool is_flushed_depth =
      templ->flags & SI_RESOURCE_FLAG_FLUSHED_DEPTH || templ->flags & SI_RESOURCE_FLAG_TRANSFER;
   bool tc_compatible_htile =
      sscreen->info.chip_class >= GFX8 &&
      /* There are issues with TC-compatible HTILE on Tonga (and
       * Iceland is the same design), and documented bug workarounds
       * don't help. For example, this fails:
       *   piglit/bin/tex-miplevel-selection 'texture()' 2DShadow -auto
       */
      sscreen->info.family != CHIP_TONGA && sscreen->info.family != CHIP_ICELAND &&
      (templ->flags & PIPE_RESOURCE_FLAG_TEXTURING_MORE_LIKELY) &&
      !(sscreen->debug_flags & DBG(NO_HYPERZ)) && !is_flushed_depth &&
      templ->nr_samples <= 1 && /* TC-compat HTILE is less efficient with MSAA */
      is_zs;
   enum radeon_surf_mode tile_mode = si_choose_tiling(sscreen, templ, tc_compatible_htile);

   /* This allocates textures with multiple planes like NV12 in 1 buffer. */
   enum
   {
      SI_TEXTURE_MAX_PLANES = 3
   };
   struct radeon_surf surface[SI_TEXTURE_MAX_PLANES] = {};
   struct pipe_resource plane_templ[SI_TEXTURE_MAX_PLANES];
   uint64_t plane_offset[SI_TEXTURE_MAX_PLANES] = {};
   uint64_t total_size = 0;
   unsigned max_alignment = 0;
   unsigned num_planes = util_format_get_num_planes(templ->format);
   assert(num_planes <= SI_TEXTURE_MAX_PLANES);

   /* Compute texture or plane layouts and offsets. */
   for (unsigned i = 0; i < num_planes; i++) {
      plane_templ[i] = *templ;
      plane_templ[i].format = util_format_get_plane_format(templ->format, i);
      plane_templ[i].width0 = util_format_get_plane_width(templ->format, i, templ->width0);
      plane_templ[i].height0 = util_format_get_plane_height(templ->format, i, templ->height0);

      /* Multi-plane allocations need PIPE_BIND_SHARED, because we can't
       * reallocate the storage to add PIPE_BIND_SHARED, because it's
       * shared by 3 pipe_resources.
       */
      if (num_planes > 1)
         plane_templ[i].bind |= PIPE_BIND_SHARED;

      if (si_init_surface(sscreen, &surface[i], &plane_templ[i], tile_mode, 0, false,
                          plane_templ[i].bind & PIPE_BIND_SCANOUT, is_flushed_depth,
                          tc_compatible_htile))
         return NULL;

      plane_offset[i] = align64(total_size, surface[i].surf_alignment);
      total_size = plane_offset[i] + surface[i].total_size;
      max_alignment = MAX2(max_alignment, surface[i].surf_alignment);
   }

   struct si_texture *plane0 = NULL, *last_plane = NULL;

   for (unsigned i = 0; i < num_planes; i++) {
      struct si_texture *tex =
         si_texture_create_object(screen, &plane_templ[i], &surface[i], plane0, NULL,
                                  plane_offset[i], total_size, max_alignment);
      if (!tex) {
         si_texture_reference(&plane0, NULL);
         return NULL;
      }

      tex->plane_index = i;
      tex->num_planes = num_planes;

      if (!plane0) {
         plane0 = last_plane = tex;
      } else {
         last_plane->buffer.b.b.next = &tex->buffer.b.b;
         last_plane = tex;
      }
   }

   return (struct pipe_resource *)plane0;
}

static struct pipe_resource *si_texture_from_winsys_buffer(struct si_screen *sscreen,
                                                           const struct pipe_resource *templ,
                                                           struct pb_buffer *buf, unsigned stride,
                                                           unsigned offset, unsigned usage,
                                                           bool dedicated)
{
   enum radeon_surf_mode array_mode;
   struct radeon_surf surface = {};
   struct radeon_bo_metadata metadata = {};
   struct si_texture *tex;
   bool is_scanout;
   int r;

   /* Ignore metadata for non-zero planes. */
   if (offset != 0)
      dedicated = false;

   if (dedicated) {
      sscreen->ws->buffer_get_metadata(buf, &metadata);
      si_get_display_metadata(sscreen, &surface, &metadata, &array_mode, &is_scanout);
   } else {
      /**
       * The bo metadata is unset for un-dedicated images. So we fall
       * back to linear. See answer to question 5 of the
       * VK_KHX_external_memory spec for some details.
       *
       * It is possible that this case isn't going to work if the
       * surface pitch isn't correctly aligned by default.
       *
       * In order to support it correctly we require multi-image
       * metadata to be syncrhonized between radv and radeonsi. The
       * semantics of associating multiple image metadata to a memory
       * object on the vulkan export side are not concretely defined
       * either.
       *
       * All the use cases we are aware of at the moment for memory
       * objects use dedicated allocations. So lets keep the initial
       * implementation simple.
       *
       * A possible alternative is to attempt to reconstruct the
       * tiling information when the TexParameter TEXTURE_TILING_EXT
       * is set.
       */
      array_mode = RADEON_SURF_MODE_LINEAR_ALIGNED;
      is_scanout = false;
   }

   r =
      si_init_surface(sscreen, &surface, templ, array_mode, stride, true, is_scanout, false, false);
   if (r)
      return NULL;

   tex = si_texture_create_object(&sscreen->b, templ, &surface, NULL, buf, offset, 0, 0);
   if (!tex)
      return NULL;

   tex->buffer.b.is_shared = true;
   tex->buffer.external_usage = usage;
   tex->num_planes = 1;

   /* Account for multiple planes with lowered yuv import. */
   struct pipe_resource *next_plane = tex->buffer.b.b.next;
   while(next_plane) {
      struct si_texture *next_tex = (struct si_texture *)next_plane;
      ++next_tex->num_planes;
      ++tex->num_planes;
      next_plane = next_plane->next;
   }

   if (!si_read_tex_bo_metadata(sscreen, tex, offset, &metadata)) {
      si_texture_reference(&tex, NULL);
      return NULL;
   }

   /* Displayable DCC requires an explicit flush. */
   if (dedicated && offset == 0 && !(usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH) &&
       si_has_displayable_dcc(tex)) {
      /* TODO: do we need to decompress DCC? */
      if (si_texture_discard_dcc(sscreen, tex)) {
         /* Update BO metadata after disabling DCC. */
         si_set_tex_bo_metadata(sscreen, tex);
      }
   }

   assert(tex->surface.tile_swizzle == 0);
   return &tex->buffer.b.b;
}

static struct pipe_resource *si_texture_from_handle(struct pipe_screen *screen,
                                                    const struct pipe_resource *templ,
                                                    struct winsys_handle *whandle, unsigned usage)
{
   struct si_screen *sscreen = (struct si_screen *)screen;
   struct pb_buffer *buf = NULL;

   /* Support only 2D textures without mipmaps */
   if ((templ->target != PIPE_TEXTURE_2D && templ->target != PIPE_TEXTURE_RECT &&
        templ->target != PIPE_TEXTURE_2D_ARRAY) ||
       templ->last_level != 0)
      return NULL;

   buf = sscreen->ws->buffer_from_handle(sscreen->ws, whandle, sscreen->info.max_alignment);
   if (!buf)
      return NULL;

   return si_texture_from_winsys_buffer(sscreen, templ, buf, whandle->stride, whandle->offset,
                                        usage, true);
}

bool si_init_flushed_depth_texture(struct pipe_context *ctx, struct pipe_resource *texture)
{
   struct si_texture *tex = (struct si_texture *)texture;
   struct pipe_resource resource;
   enum pipe_format pipe_format = texture->format;

   assert(!tex->flushed_depth_texture);

   if (!tex->can_sample_z && tex->can_sample_s) {
      switch (pipe_format) {
      case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
         /* Save memory by not allocating the S plane. */
         pipe_format = PIPE_FORMAT_Z32_FLOAT;
         break;
      case PIPE_FORMAT_Z24_UNORM_S8_UINT:
      case PIPE_FORMAT_S8_UINT_Z24_UNORM:
         /* Save memory bandwidth by not copying the
          * stencil part during flush.
          *
          * This potentially increases memory bandwidth
          * if an application uses both Z and S texturing
          * simultaneously (a flushed Z24S8 texture
          * would be stored compactly), but how often
          * does that really happen?
          */
         pipe_format = PIPE_FORMAT_Z24X8_UNORM;
         break;
      default:;
      }
   } else if (!tex->can_sample_s && tex->can_sample_z) {
      assert(util_format_has_stencil(util_format_description(pipe_format)));

      /* DB->CB copies to an 8bpp surface don't work. */
      pipe_format = PIPE_FORMAT_X24S8_UINT;
   }

   memset(&resource, 0, sizeof(resource));
   resource.target = texture->target;
   resource.format = pipe_format;
   resource.width0 = texture->width0;
   resource.height0 = texture->height0;
   resource.depth0 = texture->depth0;
   resource.array_size = texture->array_size;
   resource.last_level = texture->last_level;
   resource.nr_samples = texture->nr_samples;
   resource.usage = PIPE_USAGE_DEFAULT;
   resource.bind = texture->bind & ~PIPE_BIND_DEPTH_STENCIL;
   resource.flags = texture->flags | SI_RESOURCE_FLAG_FLUSHED_DEPTH;

   tex->flushed_depth_texture =
      (struct si_texture *)ctx->screen->resource_create(ctx->screen, &resource);
   if (!tex->flushed_depth_texture) {
      PRINT_ERR("failed to create temporary texture to hold flushed depth\n");
      return false;
   }
   return true;
}

/**
 * Initialize the pipe_resource descriptor to be of the same size as the box,
 * which is supposed to hold a subregion of the texture "orig" at the given
 * mipmap level.
 */
static void si_init_temp_resource_from_box(struct pipe_resource *res, struct pipe_resource *orig,
                                           const struct pipe_box *box, unsigned level,
                                           unsigned flags)
{
   memset(res, 0, sizeof(*res));
   res->format = orig->format;
   res->width0 = box->width;
   res->height0 = box->height;
   res->depth0 = 1;
   res->array_size = 1;
   res->usage = flags & SI_RESOURCE_FLAG_TRANSFER ? PIPE_USAGE_STAGING : PIPE_USAGE_DEFAULT;
   res->flags = flags;

   if (flags & SI_RESOURCE_FLAG_TRANSFER && util_format_is_compressed(orig->format)) {
      /* Transfer resources are allocated with linear tiling, which is
       * not supported for compressed formats.
       */
      unsigned blocksize = util_format_get_blocksize(orig->format);

      if (blocksize == 8) {
         res->format = PIPE_FORMAT_R16G16B16A16_UINT;
      } else {
         assert(blocksize == 16);
         res->format = PIPE_FORMAT_R32G32B32A32_UINT;
      }

      res->width0 = util_format_get_nblocksx(orig->format, box->width);
      res->height0 = util_format_get_nblocksy(orig->format, box->height);
   }

   /* We must set the correct texture target and dimensions for a 3D box. */
   if (box->depth > 1 && util_max_layer(orig, level) > 0) {
      res->target = PIPE_TEXTURE_2D_ARRAY;
      res->array_size = box->depth;
   } else {
      res->target = PIPE_TEXTURE_2D;
   }
}

static bool si_can_invalidate_texture(struct si_screen *sscreen, struct si_texture *tex,
                                      unsigned transfer_usage, const struct pipe_box *box)
{
   return !tex->buffer.b.is_shared && !(tex->surface.flags & RADEON_SURF_IMPORTED) &&
          !(transfer_usage & PIPE_TRANSFER_READ) && tex->buffer.b.b.last_level == 0 &&
          util_texrange_covers_whole_level(&tex->buffer.b.b, 0, box->x, box->y, box->z, box->width,
                                           box->height, box->depth);
}

static void si_texture_invalidate_storage(struct si_context *sctx, struct si_texture *tex)
{
   struct si_screen *sscreen = sctx->screen;

   /* There is no point in discarding depth and tiled buffers. */
   assert(!tex->is_depth);
   assert(tex->surface.is_linear);

   /* Reallocate the buffer in the same pipe_resource. */
   si_alloc_resource(sscreen, &tex->buffer);

   /* Initialize the CMASK base address (needed even without CMASK). */
   tex->cmask_base_address_reg = (tex->buffer.gpu_address + tex->surface.cmask_offset) >> 8;

   p_atomic_inc(&sscreen->dirty_tex_counter);

   sctx->num_alloc_tex_transfer_bytes += tex->surface.total_size;
}

static void *si_texture_transfer_map(struct pipe_context *ctx, struct pipe_resource *texture,
                                     unsigned level, unsigned usage, const struct pipe_box *box,
                                     struct pipe_transfer **ptransfer)
{
   struct si_context *sctx = (struct si_context *)ctx;
   struct si_texture *tex = (struct si_texture *)texture;
   struct si_transfer *trans;
   struct si_resource *buf;
   unsigned offset = 0;
   char *map;
   bool use_staging_texture = false;

   assert(!(texture->flags & SI_RESOURCE_FLAG_TRANSFER));
   assert(box->width && box->height && box->depth);

   /* If we are uploading into FP16 or R11G11B10_FLOAT via a blit, CB clobbers NaNs,
    * so in order to preserve them exactly, we have to use the compute blit.
    * The compute blit is used only when the destination doesn't have DCC, so
    * disable it here, which is kinda a hack.
    *
    * This makes KHR-GL45.texture_view.view_classes pass on gfx9.
    * gfx10 has the same issue, but the test doesn't use a large enough texture
    * to enable DCC and fail, so it always passes.
    */
   const struct util_format_description *desc = util_format_description(texture->format);
   if (vi_dcc_enabled(tex, level) &&
       desc->channel[0].type == UTIL_FORMAT_TYPE_FLOAT &&
       desc->channel[0].size < 32)
      si_texture_disable_dcc(sctx, tex);

   if (tex->is_depth) {
      /* Depth textures use staging unconditionally. */
      use_staging_texture = true;
   } else {
      /* Degrade the tile mode if we get too many transfers on APUs.
       * On dGPUs, the staging texture is always faster.
       * Only count uploads that are at least 4x4 pixels large.
       */
      if (!sctx->screen->info.has_dedicated_vram && level == 0 && box->width >= 4 &&
          box->height >= 4 && p_atomic_inc_return(&tex->num_level0_transfers) == 10) {
         bool can_invalidate = si_can_invalidate_texture(sctx->screen, tex, usage, box);

         si_reallocate_texture_inplace(sctx, tex, PIPE_BIND_LINEAR, can_invalidate);
      }

      /* Tiled textures need to be converted into a linear texture for CPU
       * access. The staging texture is always linear and is placed in GART.
       *
       * Reading from VRAM or GTT WC is slow, always use the staging
       * texture in this case.
       *
       * Use the staging texture for uploads if the underlying BO
       * is busy.
       */
      if (!tex->surface.is_linear)
         use_staging_texture = true;
      else if (usage & PIPE_TRANSFER_READ)
         use_staging_texture =
            tex->buffer.domains & RADEON_DOMAIN_VRAM || tex->buffer.flags & RADEON_FLAG_GTT_WC;
      /* Write & linear only: */
      else if (si_rings_is_buffer_referenced(sctx, tex->buffer.buf, RADEON_USAGE_READWRITE) ||
               !sctx->ws->buffer_wait(tex->buffer.buf, 0, RADEON_USAGE_READWRITE)) {
         /* It's busy. */
         if (si_can_invalidate_texture(sctx->screen, tex, usage, box))
            si_texture_invalidate_storage(sctx, tex);
         else
            use_staging_texture = true;
      }
   }

   trans = CALLOC_STRUCT(si_transfer);
   if (!trans)
      return NULL;
   pipe_resource_reference(&trans->b.b.resource, texture);
   trans->b.b.level = level;
   trans->b.b.usage = usage;
   trans->b.b.box = *box;

   if (use_staging_texture) {
      struct pipe_resource resource;
      struct si_texture *staging;

      si_init_temp_resource_from_box(&resource, texture, box, level, SI_RESOURCE_FLAG_TRANSFER);
      resource.usage = (usage & PIPE_TRANSFER_READ) ? PIPE_USAGE_STAGING : PIPE_USAGE_STREAM;

      /* Since depth-stencil textures don't support linear tiling,
       * blit from ZS to color and vice versa. u_blitter will do
       * the packing for these formats.
       */
      if (tex->is_depth)
         resource.format = util_blitter_get_color_format_for_zs(resource.format);

      /* Create the temporary texture. */
      staging = (struct si_texture *)ctx->screen->resource_create(ctx->screen, &resource);
      if (!staging) {
         PRINT_ERR("failed to create temporary texture to hold untiled copy\n");
         goto fail_trans;
      }
      trans->staging = &staging->buffer;

      /* Just get the strides. */
      si_texture_get_offset(sctx->screen, staging, 0, NULL, &trans->b.b.stride,
                            &trans->b.b.layer_stride);

      if (usage & PIPE_TRANSFER_READ)
         si_copy_to_staging_texture(ctx, trans);
      else
         usage |= PIPE_TRANSFER_UNSYNCHRONIZED;

      buf = trans->staging;
   } else {
      /* the resource is mapped directly */
      offset = si_texture_get_offset(sctx->screen, tex, level, box, &trans->b.b.stride,
                                     &trans->b.b.layer_stride);
      buf = &tex->buffer;
   }

   /* Always unmap texture CPU mappings on 32-bit architectures, so that
    * we don't run out of the CPU address space.
    */
   if (sizeof(void *) == 4)
      usage |= RADEON_TRANSFER_TEMPORARY;

   if (!(map = si_buffer_map_sync_with_rings(sctx, buf, usage)))
      goto fail_trans;

   *ptransfer = &trans->b.b;
   return map + offset;

fail_trans:
   si_resource_reference(&trans->staging, NULL);
   pipe_resource_reference(&trans->b.b.resource, NULL);
   FREE(trans);
   return NULL;
}

static void si_texture_transfer_unmap(struct pipe_context *ctx, struct pipe_transfer *transfer)
{
   struct si_context *sctx = (struct si_context *)ctx;
   struct si_transfer *stransfer = (struct si_transfer *)transfer;
   struct pipe_resource *texture = transfer->resource;
   struct si_texture *tex = (struct si_texture *)texture;

   /* Always unmap texture CPU mappings on 32-bit architectures, so that
    * we don't run out of the CPU address space.
    */
   if (sizeof(void *) == 4) {
      struct si_resource *buf = stransfer->staging ? stransfer->staging : &tex->buffer;

      sctx->ws->buffer_unmap(buf->buf);
   }

   if ((transfer->usage & PIPE_TRANSFER_WRITE) && stransfer->staging)
      si_copy_from_staging_texture(ctx, stransfer);

   if (stransfer->staging) {
      sctx->num_alloc_tex_transfer_bytes += stransfer->staging->buf->size;
      si_resource_reference(&stransfer->staging, NULL);
   }

   /* Heuristic for {upload, draw, upload, draw, ..}:
    *
    * Flush the gfx IB if we've allocated too much texture storage.
    *
    * The idea is that we don't want to build IBs that use too much
    * memory and put pressure on the kernel memory manager and we also
    * want to make temporary and invalidated buffers go idle ASAP to
    * decrease the total memory usage or make them reusable. The memory
    * usage will be slightly higher than given here because of the buffer
    * cache in the winsys.
    *
    * The result is that the kernel memory manager is never a bottleneck.
    */
   if (sctx->num_alloc_tex_transfer_bytes > sctx->screen->info.gart_size / 4) {
      si_flush_gfx_cs(sctx, RADEON_FLUSH_ASYNC_START_NEXT_GFX_IB_NOW, NULL);
      sctx->num_alloc_tex_transfer_bytes = 0;
   }

   pipe_resource_reference(&transfer->resource, NULL);
   FREE(transfer);
}

static const struct u_resource_vtbl si_texture_vtbl = {
   NULL,                            /* get_handle */
   si_texture_destroy,              /* resource_destroy */
   si_texture_transfer_map,         /* transfer_map */
   u_default_transfer_flush_region, /* transfer_flush_region */
   si_texture_transfer_unmap,       /* transfer_unmap */
};

/* Return if it's allowed to reinterpret one format as another with DCC enabled.
 */
bool vi_dcc_formats_compatible(struct si_screen *sscreen, enum pipe_format format1,
                               enum pipe_format format2)
{
   const struct util_format_description *desc1, *desc2;

   /* No format change - exit early. */
   if (format1 == format2)
      return true;

   format1 = si_simplify_cb_format(format1);
   format2 = si_simplify_cb_format(format2);

   /* Check again after format adjustments. */
   if (format1 == format2)
      return true;

   desc1 = util_format_description(format1);
   desc2 = util_format_description(format2);

   if (desc1->layout != UTIL_FORMAT_LAYOUT_PLAIN || desc2->layout != UTIL_FORMAT_LAYOUT_PLAIN)
      return false;

   /* Float and non-float are totally incompatible. */
   if ((desc1->channel[0].type == UTIL_FORMAT_TYPE_FLOAT) !=
       (desc2->channel[0].type == UTIL_FORMAT_TYPE_FLOAT))
      return false;

   /* Channel sizes must match across DCC formats.
    * Comparing just the first 2 channels should be enough.
    */
   if (desc1->channel[0].size != desc2->channel[0].size ||
       (desc1->nr_channels >= 2 && desc1->channel[1].size != desc2->channel[1].size))
      return false;

   /* Everything below is not needed if the driver never uses the DCC
    * clear code with the value of 1.
    */

   /* If the clear values are all 1 or all 0, this constraint can be
    * ignored. */
   if (vi_alpha_is_on_msb(sscreen, format1) != vi_alpha_is_on_msb(sscreen, format2))
      return false;

   /* Channel types must match if the clear value of 1 is used.
    * The type categories are only float, signed, unsigned.
    * NORM and INT are always compatible.
    */
   if (desc1->channel[0].type != desc2->channel[0].type ||
       (desc1->nr_channels >= 2 && desc1->channel[1].type != desc2->channel[1].type))
      return false;

   return true;
}

bool vi_dcc_formats_are_incompatible(struct pipe_resource *tex, unsigned level,
                                     enum pipe_format view_format)
{
   struct si_texture *stex = (struct si_texture *)tex;

   return vi_dcc_enabled(stex, level) &&
          !vi_dcc_formats_compatible((struct si_screen *)tex->screen, tex->format, view_format);
}

/* This can't be merged with the above function, because
 * vi_dcc_formats_compatible should be called only when DCC is enabled. */
void vi_disable_dcc_if_incompatible_format(struct si_context *sctx, struct pipe_resource *tex,
                                           unsigned level, enum pipe_format view_format)
{
   struct si_texture *stex = (struct si_texture *)tex;

   if (vi_dcc_formats_are_incompatible(tex, level, view_format))
      if (!si_texture_disable_dcc(sctx, stex))
         si_decompress_dcc(sctx, stex);
}

struct pipe_surface *si_create_surface_custom(struct pipe_context *pipe,
                                              struct pipe_resource *texture,
                                              const struct pipe_surface *templ, unsigned width0,
                                              unsigned height0, unsigned width, unsigned height)
{
   struct si_surface *surface = CALLOC_STRUCT(si_surface);

   if (!surface)
      return NULL;

   assert(templ->u.tex.first_layer <= util_max_layer(texture, templ->u.tex.level));
   assert(templ->u.tex.last_layer <= util_max_layer(texture, templ->u.tex.level));

   pipe_reference_init(&surface->base.reference, 1);
   pipe_resource_reference(&surface->base.texture, texture);
   surface->base.context = pipe;
   surface->base.format = templ->format;
   surface->base.width = width;
   surface->base.height = height;
   surface->base.u = templ->u;

   surface->width0 = width0;
   surface->height0 = height0;

   surface->dcc_incompatible =
      texture->target != PIPE_BUFFER &&
      vi_dcc_formats_are_incompatible(texture, templ->u.tex.level, templ->format);
   return &surface->base;
}

static struct pipe_surface *si_create_surface(struct pipe_context *pipe, struct pipe_resource *tex,
                                              const struct pipe_surface *templ)
{
   unsigned level = templ->u.tex.level;
   unsigned width = u_minify(tex->width0, level);
   unsigned height = u_minify(tex->height0, level);
   unsigned width0 = tex->width0;
   unsigned height0 = tex->height0;

   if (tex->target != PIPE_BUFFER && templ->format != tex->format) {
      const struct util_format_description *tex_desc = util_format_description(tex->format);
      const struct util_format_description *templ_desc = util_format_description(templ->format);

      assert(tex_desc->block.bits == templ_desc->block.bits);

      /* Adjust size of surface if and only if the block width or
       * height is changed. */
      if (tex_desc->block.width != templ_desc->block.width ||
          tex_desc->block.height != templ_desc->block.height) {
         unsigned nblks_x = util_format_get_nblocksx(tex->format, width);
         unsigned nblks_y = util_format_get_nblocksy(tex->format, height);

         width = nblks_x * templ_desc->block.width;
         height = nblks_y * templ_desc->block.height;

         width0 = util_format_get_nblocksx(tex->format, width0);
         height0 = util_format_get_nblocksy(tex->format, height0);
      }
   }

   return si_create_surface_custom(pipe, tex, templ, width0, height0, width, height);
}

static void si_surface_destroy(struct pipe_context *pipe, struct pipe_surface *surface)
{
   pipe_resource_reference(&surface->texture, NULL);
   FREE(surface);
}

unsigned si_translate_colorswap(enum pipe_format format, bool do_endian_swap)
{
   const struct util_format_description *desc = util_format_description(format);

#define HAS_SWIZZLE(chan, swz) (desc->swizzle[chan] == PIPE_SWIZZLE_##swz)

   if (format == PIPE_FORMAT_R11G11B10_FLOAT) /* isn't plain */
      return V_028C70_SWAP_STD;

   if (desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
      return ~0U;

   switch (desc->nr_channels) {
   case 1:
      if (HAS_SWIZZLE(0, X))
         return V_028C70_SWAP_STD; /* X___ */
      else if (HAS_SWIZZLE(3, X))
         return V_028C70_SWAP_ALT_REV; /* ___X */
      break;
   case 2:
      if ((HAS_SWIZZLE(0, X) && HAS_SWIZZLE(1, Y)) || (HAS_SWIZZLE(0, X) && HAS_SWIZZLE(1, NONE)) ||
          (HAS_SWIZZLE(0, NONE) && HAS_SWIZZLE(1, Y)))
         return V_028C70_SWAP_STD; /* XY__ */
      else if ((HAS_SWIZZLE(0, Y) && HAS_SWIZZLE(1, X)) ||
               (HAS_SWIZZLE(0, Y) && HAS_SWIZZLE(1, NONE)) ||
               (HAS_SWIZZLE(0, NONE) && HAS_SWIZZLE(1, X)))
         /* YX__ */
         return (do_endian_swap ? V_028C70_SWAP_STD : V_028C70_SWAP_STD_REV);
      else if (HAS_SWIZZLE(0, X) && HAS_SWIZZLE(3, Y))
         return V_028C70_SWAP_ALT; /* X__Y */
      else if (HAS_SWIZZLE(0, Y) && HAS_SWIZZLE(3, X))
         return V_028C70_SWAP_ALT_REV; /* Y__X */
      break;
   case 3:
      if (HAS_SWIZZLE(0, X))
         return (do_endian_swap ? V_028C70_SWAP_STD_REV : V_028C70_SWAP_STD);
      else if (HAS_SWIZZLE(0, Z))
         return V_028C70_SWAP_STD_REV; /* ZYX */
      break;
   case 4:
      /* check the middle channels, the 1st and 4th channel can be NONE */
      if (HAS_SWIZZLE(1, Y) && HAS_SWIZZLE(2, Z)) {
         return V_028C70_SWAP_STD; /* XYZW */
      } else if (HAS_SWIZZLE(1, Z) && HAS_SWIZZLE(2, Y)) {
         return V_028C70_SWAP_STD_REV; /* WZYX */
      } else if (HAS_SWIZZLE(1, Y) && HAS_SWIZZLE(2, X)) {
         return V_028C70_SWAP_ALT; /* ZYXW */
      } else if (HAS_SWIZZLE(1, Z) && HAS_SWIZZLE(2, W)) {
         /* YZWX */
         if (desc->is_array)
            return V_028C70_SWAP_ALT_REV;
         else
            return (do_endian_swap ? V_028C70_SWAP_ALT : V_028C70_SWAP_ALT_REV);
      }
      break;
   }
   return ~0U;
}

/* PIPELINE_STAT-BASED DCC ENABLEMENT FOR DISPLAYABLE SURFACES */

static void vi_dcc_clean_up_context_slot(struct si_context *sctx, int slot)
{
   int i;

   if (sctx->dcc_stats[slot].query_active)
      vi_separate_dcc_stop_query(sctx, sctx->dcc_stats[slot].tex);

   for (i = 0; i < ARRAY_SIZE(sctx->dcc_stats[slot].ps_stats); i++)
      if (sctx->dcc_stats[slot].ps_stats[i]) {
         sctx->b.destroy_query(&sctx->b, sctx->dcc_stats[slot].ps_stats[i]);
         sctx->dcc_stats[slot].ps_stats[i] = NULL;
      }

   si_texture_reference(&sctx->dcc_stats[slot].tex, NULL);
}

/**
 * Return the per-context slot where DCC statistics queries for the texture live.
 */
static unsigned vi_get_context_dcc_stats_index(struct si_context *sctx, struct si_texture *tex)
{
   int i, empty_slot = -1;

   /* Remove zombie textures (textures kept alive by this array only). */
   for (i = 0; i < ARRAY_SIZE(sctx->dcc_stats); i++)
      if (sctx->dcc_stats[i].tex && sctx->dcc_stats[i].tex->buffer.b.b.reference.count == 1)
         vi_dcc_clean_up_context_slot(sctx, i);

   /* Find the texture. */
   for (i = 0; i < ARRAY_SIZE(sctx->dcc_stats); i++) {
      /* Return if found. */
      if (sctx->dcc_stats[i].tex == tex) {
         sctx->dcc_stats[i].last_use_timestamp = os_time_get();
         return i;
      }

      /* Record the first seen empty slot. */
      if (empty_slot == -1 && !sctx->dcc_stats[i].tex)
         empty_slot = i;
   }

   /* Not found. Remove the oldest member to make space in the array. */
   if (empty_slot == -1) {
      int oldest_slot = 0;

      /* Find the oldest slot. */
      for (i = 1; i < ARRAY_SIZE(sctx->dcc_stats); i++)
         if (sctx->dcc_stats[oldest_slot].last_use_timestamp >
             sctx->dcc_stats[i].last_use_timestamp)
            oldest_slot = i;

      /* Clean up the oldest slot. */
      vi_dcc_clean_up_context_slot(sctx, oldest_slot);
      empty_slot = oldest_slot;
   }

   /* Add the texture to the new slot. */
   si_texture_reference(&sctx->dcc_stats[empty_slot].tex, tex);
   sctx->dcc_stats[empty_slot].last_use_timestamp = os_time_get();
   return empty_slot;
}

static struct pipe_query *vi_create_resuming_pipestats_query(struct si_context *sctx)
{
   struct si_query_hw *query =
      (struct si_query_hw *)sctx->b.create_query(&sctx->b, PIPE_QUERY_PIPELINE_STATISTICS, 0);

   query->flags |= SI_QUERY_HW_FLAG_BEGIN_RESUMES;
   return (struct pipe_query *)query;
}

/**
 * Called when binding a color buffer.
 */
void vi_separate_dcc_start_query(struct si_context *sctx, struct si_texture *tex)
{
   unsigned i = vi_get_context_dcc_stats_index(sctx, tex);

   assert(!sctx->dcc_stats[i].query_active);

   if (!sctx->dcc_stats[i].ps_stats[0])
      sctx->dcc_stats[i].ps_stats[0] = vi_create_resuming_pipestats_query(sctx);

   /* begin or resume the query */
   sctx->b.begin_query(&sctx->b, sctx->dcc_stats[i].ps_stats[0]);
   sctx->dcc_stats[i].query_active = true;
}

/**
 * Called when unbinding a color buffer.
 */
void vi_separate_dcc_stop_query(struct si_context *sctx, struct si_texture *tex)
{
   unsigned i = vi_get_context_dcc_stats_index(sctx, tex);

   assert(sctx->dcc_stats[i].query_active);
   assert(sctx->dcc_stats[i].ps_stats[0]);

   /* pause or end the query */
   sctx->b.end_query(&sctx->b, sctx->dcc_stats[i].ps_stats[0]);
   sctx->dcc_stats[i].query_active = false;
}

static bool vi_should_enable_separate_dcc(struct si_texture *tex)
{
   /* The minimum number of fullscreen draws per frame that is required
    * to enable DCC. */
   return tex->ps_draw_ratio + tex->num_slow_clears >= 5;
}

/* Called by fast clear. */
void vi_separate_dcc_try_enable(struct si_context *sctx, struct si_texture *tex)
{
   /* The intent is to use this with shared displayable back buffers,
    * but it's not strictly limited only to them.
    */
   if (!tex->buffer.b.is_shared ||
       !(tex->buffer.external_usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH) ||
       tex->buffer.b.b.target != PIPE_TEXTURE_2D || tex->buffer.b.b.last_level > 0 ||
       !tex->surface.dcc_size || sctx->screen->debug_flags & DBG(NO_DCC) ||
       sctx->screen->debug_flags & DBG(NO_DCC_FB))
      return;

   assert(sctx->chip_class >= GFX8);

   if (tex->surface.dcc_offset)
      return; /* already enabled */

   /* Enable the DCC stat gathering. */
   if (!tex->dcc_gather_statistics) {
      tex->dcc_gather_statistics = true;
      vi_separate_dcc_start_query(sctx, tex);
   }

   if (!vi_should_enable_separate_dcc(tex))
      return; /* stats show that DCC decompression is too expensive */

   assert(tex->surface.num_dcc_levels);
   assert(!tex->dcc_separate_buffer);

   si_texture_discard_cmask(sctx->screen, tex);

   /* Get a DCC buffer. */
   if (tex->last_dcc_separate_buffer) {
      assert(tex->dcc_gather_statistics);
      assert(!tex->dcc_separate_buffer);
      tex->dcc_separate_buffer = tex->last_dcc_separate_buffer;
      tex->last_dcc_separate_buffer = NULL;
   } else {
      tex->dcc_separate_buffer =
         si_aligned_buffer_create(sctx->b.screen, SI_RESOURCE_FLAG_UNMAPPABLE, PIPE_USAGE_DEFAULT,
                                  tex->surface.dcc_size, tex->surface.dcc_alignment);
      if (!tex->dcc_separate_buffer)
         return;
   }

   /* dcc_offset is the absolute GPUVM address. */
   tex->surface.dcc_offset = tex->dcc_separate_buffer->gpu_address;

   /* no need to flag anything since this is called by fast clear that
    * flags framebuffer state
    */
}

/**
 * Called by pipe_context::flush_resource, the place where DCC decompression
 * takes place.
 */
void vi_separate_dcc_process_and_reset_stats(struct pipe_context *ctx, struct si_texture *tex)
{
   struct si_context *sctx = (struct si_context *)ctx;
   struct pipe_query *tmp;
   unsigned i = vi_get_context_dcc_stats_index(sctx, tex);
   bool query_active = sctx->dcc_stats[i].query_active;
   bool disable = false;

   if (sctx->dcc_stats[i].ps_stats[2]) {
      union pipe_query_result result;

      /* Read the results. */
      struct pipe_query *query = sctx->dcc_stats[i].ps_stats[2];
      ctx->get_query_result(ctx, query, true, &result);
      si_query_buffer_reset(sctx, &((struct si_query_hw *)query)->buffer);

      /* Compute the approximate number of fullscreen draws. */
      tex->ps_draw_ratio = result.pipeline_statistics.ps_invocations /
                           (tex->buffer.b.b.width0 * tex->buffer.b.b.height0);
      sctx->last_tex_ps_draw_ratio = tex->ps_draw_ratio;

      disable = tex->dcc_separate_buffer && !vi_should_enable_separate_dcc(tex);
   }

   tex->num_slow_clears = 0;

   /* stop the statistics query for ps_stats[0] */
   if (query_active)
      vi_separate_dcc_stop_query(sctx, tex);

   /* Move the queries in the queue by one. */
   tmp = sctx->dcc_stats[i].ps_stats[2];
   sctx->dcc_stats[i].ps_stats[2] = sctx->dcc_stats[i].ps_stats[1];
   sctx->dcc_stats[i].ps_stats[1] = sctx->dcc_stats[i].ps_stats[0];
   sctx->dcc_stats[i].ps_stats[0] = tmp;

   /* create and start a new query as ps_stats[0] */
   if (query_active)
      vi_separate_dcc_start_query(sctx, tex);

   if (disable) {
      assert(!tex->last_dcc_separate_buffer);
      tex->last_dcc_separate_buffer = tex->dcc_separate_buffer;
      tex->dcc_separate_buffer = NULL;
      tex->surface.dcc_offset = 0;
      /* no need to flag anything since this is called after
       * decompression that re-sets framebuffer state
       */
   }
}

static struct pipe_memory_object *
si_memobj_from_handle(struct pipe_screen *screen, struct winsys_handle *whandle, bool dedicated)
{
   struct si_screen *sscreen = (struct si_screen *)screen;
   struct si_memory_object *memobj = CALLOC_STRUCT(si_memory_object);
   struct pb_buffer *buf = NULL;

   if (!memobj)
      return NULL;

   buf = sscreen->ws->buffer_from_handle(sscreen->ws, whandle, sscreen->info.max_alignment);
   if (!buf) {
      free(memobj);
      return NULL;
   }

   memobj->b.dedicated = dedicated;
   memobj->buf = buf;
   memobj->stride = whandle->stride;

   return (struct pipe_memory_object *)memobj;
}

static void si_memobj_destroy(struct pipe_screen *screen, struct pipe_memory_object *_memobj)
{
   struct si_memory_object *memobj = (struct si_memory_object *)_memobj;

   pb_reference(&memobj->buf, NULL);
   free(memobj);
}

static struct pipe_resource *si_texture_from_memobj(struct pipe_screen *screen,
                                                    const struct pipe_resource *templ,
                                                    struct pipe_memory_object *_memobj,
                                                    uint64_t offset)
{
   struct si_screen *sscreen = (struct si_screen *)screen;
   struct si_memory_object *memobj = (struct si_memory_object *)_memobj;
   struct pipe_resource *tex = si_texture_from_winsys_buffer(
      sscreen, templ, memobj->buf, memobj->stride, offset,
      PIPE_HANDLE_USAGE_FRAMEBUFFER_WRITE | PIPE_HANDLE_USAGE_SHADER_WRITE, memobj->b.dedicated);
   if (!tex)
      return NULL;

   /* si_texture_from_winsys_buffer doesn't increment refcount of
    * memobj->buf, so increment it here.
    */
   struct pb_buffer *buf = NULL;
   pb_reference(&buf, memobj->buf);
   return tex;
}

static bool si_check_resource_capability(struct pipe_screen *screen, struct pipe_resource *resource,
                                         unsigned bind)
{
   struct si_texture *tex = (struct si_texture *)resource;

   /* Buffers only support the linear flag. */
   if (resource->target == PIPE_BUFFER)
      return (bind & ~PIPE_BIND_LINEAR) == 0;

   if (bind & PIPE_BIND_LINEAR && !tex->surface.is_linear)
      return false;

   if (bind & PIPE_BIND_SCANOUT && !tex->surface.is_displayable)
      return false;

   /* TODO: PIPE_BIND_CURSOR - do we care? */
   return true;
}

void si_init_screen_texture_functions(struct si_screen *sscreen)
{
   sscreen->b.resource_from_handle = si_texture_from_handle;
   sscreen->b.resource_get_handle = si_texture_get_handle;
   sscreen->b.resource_get_param = si_resource_get_param;
   sscreen->b.resource_get_info = si_texture_get_info;
   sscreen->b.resource_from_memobj = si_texture_from_memobj;
   sscreen->b.memobj_create_from_handle = si_memobj_from_handle;
   sscreen->b.memobj_destroy = si_memobj_destroy;
   sscreen->b.check_resource_capability = si_check_resource_capability;
}

void si_init_context_texture_functions(struct si_context *sctx)
{
   sctx->b.create_surface = si_create_surface;
   sctx->b.surface_destroy = si_surface_destroy;
}