[mesa.git] / src / gallium / drivers / radeon / r600_texture.c

/*
 * Copyright 2010 Jerome Glisse <glisse@freedesktop.org>
 *
 * 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.
 *
 * Authors:
 *      Jerome Glisse
 *      Corbin Simpson
 */
#include "r600_pipe_common.h"
#include "r600_cs.h"
#include "r600_query.h"
#include "util/u_format.h"
#include "util/u_memory.h"
#include "util/u_pack_color.h"
#include "util/u_surface.h"
#include "os/os_time.h"
#include <errno.h>
#include <inttypes.h>

static void r600_texture_discard_cmask(struct r600_common_screen *rscreen,
                                       struct r600_texture *rtex);
static enum radeon_surf_mode
r600_choose_tiling(struct r600_common_screen *rscreen,
                   const struct pipe_resource *templ);


bool r600_prepare_for_dma_blit(struct r600_common_context *rctx,
                               struct r600_texture *rdst,
                               unsigned dst_level, unsigned dstx,
                               unsigned dsty, unsigned dstz,
                               struct r600_texture *rsrc,
                               unsigned src_level,
                               const struct pipe_box *src_box)
{
        if (!rctx->dma.cs)
                return false;

        if (rdst->surface.bpe != rsrc->surface.bpe)
                return false;

        /* MSAA: Blits don't exist in the real world. */
        if (rsrc->resource.b.b.nr_samples > 1 ||
            rdst->resource.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 (rsrc->is_depth || rdst->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 ((rsrc->dcc_offset && src_level < rsrc->surface.num_dcc_levels) ||
            (rdst->dcc_offset && dst_level < rdst->surface.num_dcc_levels))
                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 (rdst->cmask.size && rdst->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(&rdst->resource.b.b, dst_level,
                                                      dstx, dsty, dstz, src_box->width,
                                                      src_box->height, src_box->depth))
                        return false;

                r600_texture_discard_cmask(rctx->screen, rdst);
        }

        /* All requirements are met. Prepare textures for SDMA. */
        if (rsrc->cmask.size && rsrc->dirty_level_mask & (1 << src_level))
                rctx->b.flush_resource(&rctx->b, &rsrc->resource.b.b);

        assert(!(rsrc->dirty_level_mask & (1 << src_level)));
        assert(!(rdst->dirty_level_mask & (1 << dst_level)));

        return true;
}

/* Same as resource_copy_region, except that both upsampling and downsampling are allowed. */
static void r600_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(src->format) &
                    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 r600_copy_to_staging_texture(struct pipe_context *ctx, struct r600_transfer *rtransfer)
{
        struct r600_common_context *rctx = (struct r600_common_context*)ctx;
        struct pipe_transfer *transfer = (struct pipe_transfer*)rtransfer;
        struct pipe_resource *dst = &rtransfer->staging->b.b;
        struct pipe_resource *src = transfer->resource;

        if (src->nr_samples > 1) {
                r600_copy_region_with_blit(ctx, dst, 0, 0, 0, 0,
                                           src, transfer->level, &transfer->box);
                return;
        }

        rctx->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 r600_copy_from_staging_texture(struct pipe_context *ctx, struct r600_transfer *rtransfer)
{
        struct r600_common_context *rctx = (struct r600_common_context*)ctx;
        struct pipe_transfer *transfer = (struct pipe_transfer*)rtransfer;
        struct pipe_resource *dst = transfer->resource;
        struct pipe_resource *src = &rtransfer->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) {
                r600_copy_region_with_blit(ctx, dst, transfer->level,
                                           transfer->box.x, transfer->box.y, transfer->box.z,
                                           src, 0, &sbox);
                return;
        }

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

static unsigned r600_texture_get_offset(struct r600_texture *rtex, unsigned level,
                                        const struct pipe_box *box)
{
        return rtex->surface.level[level].offset +
               box->z * rtex->surface.level[level].slice_size +
               box->y / rtex->surface.blk_h * rtex->surface.level[level].pitch_bytes +
               box->x / rtex->surface.blk_w * rtex->surface.bpe;
}

static int r600_init_surface(struct r600_common_screen *rscreen,
                             struct radeon_surf *surface,
                             const struct pipe_resource *ptex,
                             enum radeon_surf_mode array_mode,
                             unsigned pitch_in_bytes_override,
                             unsigned offset,
                             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 i, bpe, flags = 0;

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

        if (rscreen->chip_class >= EVERGREEN && !is_flushed_depth &&
            ptex->format == PIPE_FORMAT_Z32_FLOAT_S8X24_UINT) {
                bpe = 4; /* stencil is allocated separately on evergreen */
        } else {
                bpe = util_format_get_blocksize(ptex->format);
                /* align byte per element on dword */
                if (bpe == 3) {
                        bpe = 4;
                }
        }

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

                if (tc_compatible_htile &&
                    array_mode == RADEON_SURF_MODE_2D) {
                        /* TC-compatible HTILE only supports Z32_FLOAT.
                         * Promote Z16 to Z32. DB->CB copies will convert
                         * the format for transfers.
                         */
                        bpe = 4;
                        flags |= RADEON_SURF_TC_COMPATIBLE_HTILE;
                }

                if (is_stencil)
                        flags |= RADEON_SURF_SBUFFER;
        }

        if (rscreen->chip_class >= VI &&
            (ptex->flags & R600_RESOURCE_FLAG_DISABLE_DCC ||
             ptex->format == PIPE_FORMAT_R9G9B9E5_FLOAT))
                flags |= RADEON_SURF_DISABLE_DCC;

        if (ptex->bind & PIPE_BIND_SCANOUT || 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 (is_imported)
                flags |= RADEON_SURF_IMPORTED;

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

        if (pitch_in_bytes_override && pitch_in_bytes_override != surface->level[0].pitch_bytes) {
                /* old ddx on evergreen over estimate alignment for 1d, only 1 level
                 * for those
                 */
                surface->level[0].nblk_x = pitch_in_bytes_override / bpe;
                surface->level[0].pitch_bytes = pitch_in_bytes_override;
                surface->level[0].slice_size = pitch_in_bytes_override * surface->level[0].nblk_y;
        }

        if (offset) {
                for (i = 0; i < ARRAY_SIZE(surface->level); ++i)
                        surface->level[i].offset += offset;
        }
        return 0;
}

static void r600_texture_init_metadata(struct r600_texture *rtex,
                                       struct radeon_bo_metadata *metadata)
{
        struct radeon_surf *surface = &rtex->surface;

        memset(metadata, 0, sizeof(*metadata));
        metadata->microtile = surface->level[0].mode >= RADEON_SURF_MODE_1D ?
                                   RADEON_LAYOUT_TILED : RADEON_LAYOUT_LINEAR;
        metadata->macrotile = surface->level[0].mode >= RADEON_SURF_MODE_2D ?
                                   RADEON_LAYOUT_TILED : RADEON_LAYOUT_LINEAR;
        metadata->pipe_config = surface->pipe_config;
        metadata->bankw = surface->bankw;
        metadata->bankh = surface->bankh;
        metadata->tile_split = surface->tile_split;
        metadata->mtilea = surface->mtilea;
        metadata->num_banks = surface->num_banks;
        metadata->stride = surface->level[0].pitch_bytes;
        metadata->scanout = (surface->flags & RADEON_SURF_SCANOUT) != 0;
}

static void r600_dirty_all_framebuffer_states(struct r600_common_screen *rscreen)
{
        p_atomic_inc(&rscreen->dirty_fb_counter);
}

static void r600_eliminate_fast_color_clear(struct r600_common_context *rctx,
                                            struct r600_texture *rtex)
{
        struct r600_common_screen *rscreen = rctx->screen;
        struct pipe_context *ctx = &rctx->b;

        if (ctx == rscreen->aux_context)
                pipe_mutex_lock(rscreen->aux_context_lock);

        ctx->flush_resource(ctx, &rtex->resource.b.b);
        ctx->flush(ctx, NULL, 0);

        if (ctx == rscreen->aux_context)
                pipe_mutex_unlock(rscreen->aux_context_lock);
}

static void r600_texture_discard_cmask(struct r600_common_screen *rscreen,
                                       struct r600_texture *rtex)
{
        if (!rtex->cmask.size)
                return;

        assert(rtex->resource.b.b.nr_samples <= 1);

        /* Disable CMASK. */
        memset(&rtex->cmask, 0, sizeof(rtex->cmask));
        rtex->cmask.base_address_reg = rtex->resource.gpu_address >> 8;
        rtex->dirty_level_mask = 0;

        if (rscreen->chip_class >= SI)
                rtex->cb_color_info &= ~SI_S_028C70_FAST_CLEAR(1);
        else
                rtex->cb_color_info &= ~EG_S_028C70_FAST_CLEAR(1);

        if (rtex->cmask_buffer != &rtex->resource)
            r600_resource_reference(&rtex->cmask_buffer, NULL);

        /* Notify all contexts about the change. */
        r600_dirty_all_framebuffer_states(rscreen);
        p_atomic_inc(&rscreen->compressed_colortex_counter);
}

static bool r600_can_disable_dcc(struct r600_texture *rtex)
{
        /* We can't disable DCC if it can be written by another process. */
        return rtex->dcc_offset &&
               (!rtex->resource.is_shared ||
                !(rtex->resource.external_usage & PIPE_HANDLE_USAGE_WRITE));
}

static bool r600_texture_discard_dcc(struct r600_common_screen *rscreen,
                                     struct r600_texture *rtex)
{
        if (!r600_can_disable_dcc(rtex))
                return false;

        assert(rtex->dcc_separate_buffer == NULL);

        /* Disable DCC. */
        rtex->dcc_offset = 0;

        /* Notify all contexts about the change. */
        r600_dirty_all_framebuffer_states(rscreen);
        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 rctx  the current context if you have one, or rscreen->aux_context
 *              if you don't.
 */
bool r600_texture_disable_dcc(struct r600_common_context *rctx,
                              struct r600_texture *rtex)
{
        struct r600_common_screen *rscreen = rctx->screen;

        if (!r600_can_disable_dcc(rtex))
                return false;

        if (&rctx->b == rscreen->aux_context)
                pipe_mutex_lock(rscreen->aux_context_lock);

        /* Decompress DCC. */
        rctx->decompress_dcc(&rctx->b, rtex);
        rctx->b.flush(&rctx->b, NULL, 0);

        if (&rctx->b == rscreen->aux_context)
                pipe_mutex_unlock(rscreen->aux_context_lock);

        return r600_texture_discard_dcc(rscreen, rtex);
}

static void r600_degrade_tile_mode_to_linear(struct r600_common_context *rctx,
                                             struct r600_texture *rtex,
                                             bool invalidate_storage)
{
        struct pipe_screen *screen = rctx->b.screen;
        struct r600_texture *new_tex;
        struct pipe_resource templ = rtex->resource.b.b;
        unsigned i;

        templ.bind |= PIPE_BIND_LINEAR;

        /* r600g doesn't react to dirty_tex_descriptor_counter */
        if (rctx->chip_class < SI)
                return;

        if (rtex->resource.is_shared ||
            rtex->surface.level[0].mode == RADEON_SURF_MODE_LINEAR_ALIGNED)
                return;

        /* This fails with MSAA, depth, and compressed textures. */
        if (r600_choose_tiling(rctx->screen, &templ) !=
            RADEON_SURF_MODE_LINEAR_ALIGNED)
                return;

        new_tex = (struct r600_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_max_layer(&templ, i) + 1, &box);

                        rctx->dma_copy(&rctx->b, &new_tex->resource.b.b, i, 0, 0, 0,
                                       &rtex->resource.b.b, i, &box);
                }
        }

        r600_texture_discard_cmask(rctx->screen, rtex);
        r600_texture_discard_dcc(rctx->screen, rtex);

        /* Replace the structure fields of rtex. */
        rtex->resource.b.b.bind = templ.bind;
        pb_reference(&rtex->resource.buf, new_tex->resource.buf);
        rtex->resource.gpu_address = new_tex->resource.gpu_address;
        rtex->resource.vram_usage = new_tex->resource.vram_usage;
        rtex->resource.gart_usage = new_tex->resource.gart_usage;
        rtex->resource.bo_size = new_tex->resource.bo_size;
        rtex->resource.bo_alignment = new_tex->resource.bo_alignment;
        rtex->resource.domains = new_tex->resource.domains;
        rtex->resource.flags = new_tex->resource.flags;
        rtex->size = new_tex->size;
        rtex->surface = new_tex->surface;
        rtex->non_disp_tiling = new_tex->non_disp_tiling;
        rtex->cb_color_info = new_tex->cb_color_info;
        rtex->cmask = new_tex->cmask; /* needed even without CMASK */

        assert(!rtex->htile_buffer);
        assert(!rtex->cmask.size);
        assert(!rtex->fmask.size);
        assert(!rtex->dcc_offset);
        assert(!rtex->is_depth);

        r600_texture_reference(&new_tex, NULL);

        r600_dirty_all_framebuffer_states(rctx->screen);
        p_atomic_inc(&rctx->screen->dirty_tex_descriptor_counter);
}

static boolean r600_texture_get_handle(struct pipe_screen* screen,
                                       struct pipe_context *ctx,
                                       struct pipe_resource *resource,
                                       struct winsys_handle *whandle,
                                       unsigned usage)
{
        struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
        struct r600_common_context *rctx = (struct r600_common_context*)
                                           (ctx ? ctx : rscreen->aux_context);
        struct r600_resource *res = (struct r600_resource*)resource;
        struct r600_texture *rtex = (struct r600_texture*)resource;
        struct radeon_bo_metadata metadata;
        bool update_metadata = false;

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

        if (resource->target != PIPE_BUFFER) {
                /* Since shader image stores don't support DCC on VI,
                 * disable it for external clients that want write
                 * access.
                 */
                if (usage & PIPE_HANDLE_USAGE_WRITE && rtex->dcc_offset) {
                        if (r600_texture_disable_dcc(rctx, rtex))
                                update_metadata = true;
                }

                if (!(usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH) &&
                    (rtex->cmask.size || rtex->dcc_offset)) {
                        /* Eliminate fast clear (both CMASK and DCC) */
                        r600_eliminate_fast_color_clear(rctx, rtex);

                        /* Disable CMASK if flush_resource isn't going
                         * to be called.
                         */
                        if (rtex->cmask.size)
                                r600_texture_discard_cmask(rscreen, rtex);
                }

                /* Set metadata. */
                if (!res->is_shared || update_metadata) {
                        r600_texture_init_metadata(rtex, &metadata);
                        if (rscreen->query_opaque_metadata)
                                rscreen->query_opaque_metadata(rscreen, rtex,
                                                               &metadata);

                        rscreen->ws->buffer_set_metadata(res->buf, &metadata);
                }
        }

        if (res->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->is_shared = true;
                res->external_usage = usage;
        }

        return rscreen->ws->buffer_get_handle(res->buf,
                                              rtex->surface.level[0].pitch_bytes,
                                              rtex->surface.level[0].offset,
                                              rtex->surface.level[0].slice_size,
                                              whandle);
}

static void r600_texture_destroy(struct pipe_screen *screen,
                                 struct pipe_resource *ptex)
{
        struct r600_texture *rtex = (struct r600_texture*)ptex;
        struct r600_resource *resource = &rtex->resource;

        r600_texture_reference(&rtex->flushed_depth_texture, NULL);

        r600_resource_reference(&rtex->htile_buffer, NULL);
        if (rtex->cmask_buffer != &rtex->resource) {
            r600_resource_reference(&rtex->cmask_buffer, NULL);
        }
        pb_reference(&resource->buf, NULL);
        r600_resource_reference(&rtex->dcc_separate_buffer, NULL);
        r600_resource_reference(&rtex->last_dcc_separate_buffer, NULL);
        FREE(rtex);
}

static const struct u_resource_vtbl r600_texture_vtbl;

/* The number of samples can be specified independently of the texture. */
void r600_texture_get_fmask_info(struct r600_common_screen *rscreen,
                                 struct r600_texture *rtex,
                                 unsigned nr_samples,
                                 struct r600_fmask_info *out)
{
        /* FMASK is allocated like an ordinary texture. */
        struct pipe_resource templ = rtex->resource.b.b;
        struct radeon_surf fmask = {};
        unsigned flags, bpe;

        memset(out, 0, sizeof(*out));

        templ.nr_samples = 1;
        flags = rtex->surface.flags | RADEON_SURF_FMASK;

        if (rscreen->chip_class <= CAYMAN) {
                /* Use the same parameters and tile mode. */
                fmask.bankw = rtex->surface.bankw;
                fmask.bankh = rtex->surface.bankh;
                fmask.mtilea = rtex->surface.mtilea;
                fmask.tile_split = rtex->surface.tile_split;

                if (nr_samples <= 4)
                        fmask.bankh = 4;
        }

        switch (nr_samples) {
        case 2:
        case 4:
                bpe = 1;
                break;
        case 8:
                bpe = 4;
                break;
        default:
                R600_ERR("Invalid sample count for FMASK allocation.\n");
                return;
        }

        /* Overallocate FMASK on R600-R700 to fix colorbuffer corruption.
         * This can be fixed by writing a separate FMASK allocator specifically
         * for R600-R700 asics. */
        if (rscreen->chip_class <= R700) {
                bpe *= 2;
        }

        if (rscreen->ws->surface_init(rscreen->ws, &templ, flags, bpe,
                                      RADEON_SURF_MODE_2D, &fmask)) {
                R600_ERR("Got error in surface_init while allocating FMASK.\n");
                return;
        }

        assert(fmask.level[0].mode == RADEON_SURF_MODE_2D);

        out->slice_tile_max = (fmask.level[0].nblk_x * fmask.level[0].nblk_y) / 64;
        if (out->slice_tile_max)
                out->slice_tile_max -= 1;

        out->tile_mode_index = fmask.tiling_index[0];
        out->pitch_in_pixels = fmask.level[0].nblk_x;
        out->bank_height = fmask.bankh;
        out->alignment = MAX2(256, fmask.surf_alignment);
        out->size = fmask.surf_size;
}

static void r600_texture_allocate_fmask(struct r600_common_screen *rscreen,
                                        struct r600_texture *rtex)
{
        r600_texture_get_fmask_info(rscreen, rtex,
                                    rtex->resource.b.b.nr_samples, &rtex->fmask);

        rtex->fmask.offset = align64(rtex->size, rtex->fmask.alignment);
        rtex->size = rtex->fmask.offset + rtex->fmask.size;
}

void r600_texture_get_cmask_info(struct r600_common_screen *rscreen,
                                 struct r600_texture *rtex,
                                 struct r600_cmask_info *out)
{
        unsigned cmask_tile_width = 8;
        unsigned cmask_tile_height = 8;
        unsigned cmask_tile_elements = cmask_tile_width * cmask_tile_height;
        unsigned element_bits = 4;
        unsigned cmask_cache_bits = 1024;
        unsigned num_pipes = rscreen->info.num_tile_pipes;
        unsigned pipe_interleave_bytes = rscreen->info.pipe_interleave_bytes;

        unsigned elements_per_macro_tile = (cmask_cache_bits / element_bits) * num_pipes;
        unsigned pixels_per_macro_tile = elements_per_macro_tile * cmask_tile_elements;
        unsigned sqrt_pixels_per_macro_tile = sqrt(pixels_per_macro_tile);
        unsigned macro_tile_width = util_next_power_of_two(sqrt_pixels_per_macro_tile);
        unsigned macro_tile_height = pixels_per_macro_tile / macro_tile_width;

        unsigned pitch_elements = align(rtex->resource.b.b.width0, macro_tile_width);
        unsigned height = align(rtex->resource.b.b.height0, macro_tile_height);

        unsigned base_align = num_pipes * pipe_interleave_bytes;
        unsigned slice_bytes =
                ((pitch_elements * height * element_bits + 7) / 8) / cmask_tile_elements;

        assert(macro_tile_width % 128 == 0);
        assert(macro_tile_height % 128 == 0);

        out->slice_tile_max = ((pitch_elements * height) / (128*128)) - 1;
        out->alignment = MAX2(256, base_align);
        out->size = (util_max_layer(&rtex->resource.b.b, 0) + 1) *
                    align(slice_bytes, base_align);
}

static void si_texture_get_cmask_info(struct r600_common_screen *rscreen,
                                      struct r600_texture *rtex,
                                      struct r600_cmask_info *out)
{
        unsigned pipe_interleave_bytes = rscreen->info.pipe_interleave_bytes;
        unsigned num_pipes = rscreen->info.num_tile_pipes;
        unsigned cl_width, cl_height;

        switch (num_pipes) {
        case 2:
                cl_width = 32;
                cl_height = 16;
                break;
        case 4:
                cl_width = 32;
                cl_height = 32;
                break;
        case 8:
                cl_width = 64;
                cl_height = 32;
                break;
        case 16: /* Hawaii */
                cl_width = 64;
                cl_height = 64;
                break;
        default:
                assert(0);
                return;
        }

        unsigned base_align = num_pipes * pipe_interleave_bytes;

        unsigned width = align(rtex->resource.b.b.width0, cl_width*8);
        unsigned height = align(rtex->resource.b.b.height0, cl_height*8);
        unsigned slice_elements = (width * height) / (8*8);

        /* Each element of CMASK is a nibble. */
        unsigned slice_bytes = slice_elements / 2;

        out->slice_tile_max = (width * height) / (128*128);
        if (out->slice_tile_max)
                out->slice_tile_max -= 1;

        out->alignment = MAX2(256, base_align);
        out->size = (util_max_layer(&rtex->resource.b.b, 0) + 1) *
                    align(slice_bytes, base_align);
}

static void r600_texture_allocate_cmask(struct r600_common_screen *rscreen,
                                        struct r600_texture *rtex)
{
        if (rscreen->chip_class >= SI) {
                si_texture_get_cmask_info(rscreen, rtex, &rtex->cmask);
        } else {
                r600_texture_get_cmask_info(rscreen, rtex, &rtex->cmask);
        }

        rtex->cmask.offset = align64(rtex->size, rtex->cmask.alignment);
        rtex->size = rtex->cmask.offset + rtex->cmask.size;

        if (rscreen->chip_class >= SI)
                rtex->cb_color_info |= SI_S_028C70_FAST_CLEAR(1);
        else
                rtex->cb_color_info |= EG_S_028C70_FAST_CLEAR(1);
}

static void r600_texture_alloc_cmask_separate(struct r600_common_screen *rscreen,
                                              struct r600_texture *rtex)
{
        if (rtex->cmask_buffer)
                return;

        assert(rtex->cmask.size == 0);

        if (rscreen->chip_class >= SI) {
                si_texture_get_cmask_info(rscreen, rtex, &rtex->cmask);
        } else {
                r600_texture_get_cmask_info(rscreen, rtex, &rtex->cmask);
        }

        rtex->cmask_buffer = (struct r600_resource *)
                r600_aligned_buffer_create(&rscreen->b, 0, PIPE_USAGE_DEFAULT,
                                           rtex->cmask.size,
                                           rtex->cmask.alignment);
        if (rtex->cmask_buffer == NULL) {
                rtex->cmask.size = 0;
                return;
        }

        /* update colorbuffer state bits */
        rtex->cmask.base_address_reg = rtex->cmask_buffer->gpu_address >> 8;

        if (rscreen->chip_class >= SI)
                rtex->cb_color_info |= SI_S_028C70_FAST_CLEAR(1);
        else
                rtex->cb_color_info |= EG_S_028C70_FAST_CLEAR(1);

        p_atomic_inc(&rscreen->compressed_colortex_counter);
}

static void r600_texture_get_htile_size(struct r600_common_screen *rscreen,
                                        struct r600_texture *rtex)
{
        unsigned cl_width, cl_height, width, height;
        unsigned slice_elements, slice_bytes, pipe_interleave_bytes, base_align;
        unsigned num_pipes = rscreen->info.num_tile_pipes;

        rtex->surface.htile_size = 0;

        if (rscreen->chip_class <= EVERGREEN &&
            rscreen->info.drm_major == 2 && rscreen->info.drm_minor < 26)
                return;

        /* HW bug on R6xx. */
        if (rscreen->chip_class == R600 &&
            (rtex->resource.b.b.width0 > 7680 ||
             rtex->resource.b.b.height0 > 7680))
                return;

        /* HTILE is broken with 1D tiling on old kernels and CIK. */
        if (rscreen->chip_class >= CIK &&
            rtex->surface.level[0].mode == RADEON_SURF_MODE_1D &&
            rscreen->info.drm_major == 2 && rscreen->info.drm_minor < 38)
                return;

        /* Overalign HTILE on P2 configs to work around GPU hangs in
         * piglit/depthstencil-render-miplevels 585.
         *
         * This has been confirmed to help Kabini & Stoney, where the hangs
         * are always reproducible. I think I have seen the test hang
         * on Carrizo too, though it was very rare there.
         */
        if (rscreen->chip_class >= CIK && num_pipes < 4)
                num_pipes = 4;

        switch (num_pipes) {
        case 1:
                cl_width = 32;
                cl_height = 16;
                break;
        case 2:
                cl_width = 32;
                cl_height = 32;
                break;
        case 4:
                cl_width = 64;
                cl_height = 32;
                break;
        case 8:
                cl_width = 64;
                cl_height = 64;
                break;
        case 16:
                cl_width = 128;
                cl_height = 64;
                break;
        default:
                assert(0);
                return;
        }

        width = align(rtex->resource.b.b.width0, cl_width * 8);
        height = align(rtex->resource.b.b.height0, cl_height * 8);

        slice_elements = (width * height) / (8 * 8);
        slice_bytes = slice_elements * 4;

        pipe_interleave_bytes = rscreen->info.pipe_interleave_bytes;
        base_align = num_pipes * pipe_interleave_bytes;

        rtex->surface.htile_alignment = base_align;
        rtex->surface.htile_size =
                (util_max_layer(&rtex->resource.b.b, 0) + 1) *
                align(slice_bytes, base_align);
}

static void r600_texture_allocate_htile(struct r600_common_screen *rscreen,
                                        struct r600_texture *rtex)
{
        uint32_t clear_value;

        if (rtex->tc_compatible_htile) {
                clear_value = 0x0000030F;
        } else {
                r600_texture_get_htile_size(rscreen, rtex);
                clear_value = 0;
        }

        if (!rtex->surface.htile_size)
                return;

        rtex->htile_buffer = (struct r600_resource*)
                r600_aligned_buffer_create(&rscreen->b, 0, PIPE_USAGE_DEFAULT,
                                           rtex->surface.htile_size,
                                           rtex->surface.htile_alignment);
        if (rtex->htile_buffer == NULL) {
                /* this is not a fatal error as we can still keep rendering
                 * without htile buffer */
                R600_ERR("Failed to create buffer object for htile buffer.\n");
        } else {
                r600_screen_clear_buffer(rscreen, &rtex->htile_buffer->b.b,
                                         0, rtex->surface.htile_size,
                                         clear_value, R600_COHERENCY_NONE);
        }
}

void r600_print_texture_info(struct r600_texture *rtex, FILE *f)
{
        int i;

        fprintf(f, "  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",
                rtex->resource.b.b.width0, rtex->resource.b.b.height0,
                rtex->resource.b.b.depth0, rtex->surface.blk_w,
                rtex->surface.blk_h,
                rtex->resource.b.b.array_size, rtex->resource.b.b.last_level,
                rtex->surface.bpe, rtex->resource.b.b.nr_samples,
                rtex->surface.flags, util_format_short_name(rtex->resource.b.b.format));

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

        if (rtex->fmask.size)
                fprintf(f, "  FMask: offset=%"PRIu64", size=%"PRIu64", alignment=%u, pitch_in_pixels=%u, "
                        "bankh=%u, slice_tile_max=%u, tile_mode_index=%u\n",
                        rtex->fmask.offset, rtex->fmask.size, rtex->fmask.alignment,
                        rtex->fmask.pitch_in_pixels, rtex->fmask.bank_height,
                        rtex->fmask.slice_tile_max, rtex->fmask.tile_mode_index);

        if (rtex->cmask.size)
                fprintf(f, "  CMask: offset=%"PRIu64", size=%"PRIu64", alignment=%u, "
                        "slice_tile_max=%u\n",
                        rtex->cmask.offset, rtex->cmask.size, rtex->cmask.alignment,
                        rtex->cmask.slice_tile_max);

        if (rtex->htile_buffer)
                fprintf(f, "  HTile: size=%u, alignment=%u, TC_compatible = %u\n",
                        rtex->htile_buffer->b.b.width0,
                        rtex->htile_buffer->buf->alignment,
                        rtex->tc_compatible_htile);

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

        for (i = 0; i <= rtex->resource.b.b.last_level; i++)
                fprintf(f, "  Level[%i]: offset=%"PRIu64", slice_size=%"PRIu64", "
                        "npix_x=%u, npix_y=%u, npix_z=%u, nblk_x=%u, nblk_y=%u, "
                        "pitch_bytes=%u, mode=%u, tiling_index = %u\n",
                        i, rtex->surface.level[i].offset,
                        rtex->surface.level[i].slice_size,
                        u_minify(rtex->resource.b.b.width0, i),
                        u_minify(rtex->resource.b.b.height0, i),
                        u_minify(rtex->resource.b.b.depth0, i),
                        rtex->surface.level[i].nblk_x,
                        rtex->surface.level[i].nblk_y,
                        rtex->surface.level[i].pitch_bytes,
                        rtex->surface.level[i].mode,
                        rtex->surface.tiling_index[i]);

        if (rtex->surface.flags & RADEON_SURF_SBUFFER) {
                fprintf(f, "  StencilLayout: tilesplit=%u\n",
                        rtex->surface.stencil_tile_split);
                for (i = 0; i <= rtex->resource.b.b.last_level; i++) {
                        fprintf(f, "  StencilLevel[%i]: offset=%"PRIu64", "
                                "slice_size=%"PRIu64", npix_x=%u, "
                                "npix_y=%u, npix_z=%u, nblk_x=%u, nblk_y=%u, "
                                "pitch_bytes=%u, mode=%u, tiling_index = %u\n",
                                i, rtex->surface.stencil_level[i].offset,
                                rtex->surface.stencil_level[i].slice_size,
                                u_minify(rtex->resource.b.b.width0, i),
                                u_minify(rtex->resource.b.b.height0, i),
                                u_minify(rtex->resource.b.b.depth0, i),
                                rtex->surface.stencil_level[i].nblk_x,
                                rtex->surface.stencil_level[i].nblk_y,
                                rtex->surface.stencil_level[i].pitch_bytes,
                                rtex->surface.stencil_level[i].mode,
                                rtex->surface.stencil_tiling_index[i]);
                }
        }
}

/* Common processing for r600_texture_create and r600_texture_from_handle */
static struct r600_texture *
r600_texture_create_object(struct pipe_screen *screen,
                           const struct pipe_resource *base,
                           struct pb_buffer *buf,
                           struct radeon_surf *surface)
{
        struct r600_texture *rtex;
        struct r600_resource *resource;
        struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;

        rtex = CALLOC_STRUCT(r600_texture);
        if (!rtex)
                return NULL;

        resource = &rtex->resource;
        resource->b.b = *base;
        resource->b.b.next = NULL;
        resource->b.vtbl = &r600_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 */
        rtex->is_depth = util_format_has_depth(util_format_description(rtex->resource.b.b.format));

        rtex->surface = *surface;
        rtex->size = rtex->surface.surf_size;

        rtex->tc_compatible_htile = rtex->surface.htile_size != 0;
        assert(!!(rtex->surface.flags & RADEON_SURF_TC_COMPATIBLE_HTILE) ==
               rtex->tc_compatible_htile);

        /* TC-compatible HTILE only supports Z32_FLOAT. */
        if (rtex->tc_compatible_htile)
                rtex->db_render_format = PIPE_FORMAT_Z32_FLOAT;
        else
                rtex->db_render_format = base->format;

        /* Tiled depth textures utilize the non-displayable tile order.
         * This must be done after r600_setup_surface.
         * Applies to R600-Cayman. */
        rtex->non_disp_tiling = rtex->is_depth && rtex->surface.level[0].mode >= RADEON_SURF_MODE_1D;
        /* Applies to GCN. */
        rtex->last_msaa_resolve_target_micro_mode = rtex->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.
         */
        rtex->ps_draw_ratio = 0;

        if (rtex->is_depth) {
                if (base->flags & (R600_RESOURCE_FLAG_TRANSFER |
                                   R600_RESOURCE_FLAG_FLUSHED_DEPTH) ||
                    rscreen->chip_class >= EVERGREEN) {
                        rtex->can_sample_z = !rtex->surface.depth_adjusted;
                        rtex->can_sample_s = !rtex->surface.stencil_adjusted;
                } else {
                        if (rtex->resource.b.b.nr_samples <= 1 &&
                            (rtex->resource.b.b.format == PIPE_FORMAT_Z16_UNORM ||
                             rtex->resource.b.b.format == PIPE_FORMAT_Z32_FLOAT))
                                rtex->can_sample_z = true;
                }

                if (!(base->flags & (R600_RESOURCE_FLAG_TRANSFER |
                                     R600_RESOURCE_FLAG_FLUSHED_DEPTH))) {
                        rtex->db_compatible = true;

                        if (!(rscreen->debug_flags & DBG_NO_HYPERZ))
                                r600_texture_allocate_htile(rscreen, rtex);
                }
        } else {
                if (base->nr_samples > 1) {
                        if (!buf) {
                                r600_texture_allocate_fmask(rscreen, rtex);
                                r600_texture_allocate_cmask(rscreen, rtex);
                                rtex->cmask_buffer = &rtex->resource;
                        }
                        if (!rtex->fmask.size || !rtex->cmask.size) {
                                FREE(rtex);
                                return NULL;
                        }
                }

                /* Shared textures must always set up DCC here.
                 * If it's not present, it will be disabled by
                 * apply_opaque_metadata later.
                 */
                if (rtex->surface.dcc_size &&
                    (buf || !(rscreen->debug_flags & DBG_NO_DCC)) &&
                    !(rtex->surface.flags & RADEON_SURF_SCANOUT)) {
                        /* Reserve space for the DCC buffer. */
                        rtex->dcc_offset = align64(rtex->size, rtex->surface.dcc_alignment);
                        rtex->size = rtex->dcc_offset + rtex->surface.dcc_size;
                }
        }

        /* Now create the backing buffer. */
        if (!buf) {
                r600_init_resource_fields(rscreen, resource, rtex->size,
                                          rtex->surface.surf_alignment);

                resource->flags |= RADEON_FLAG_HANDLE;

                if (!r600_alloc_resource(rscreen, resource)) {
                        FREE(rtex);
                        return NULL;
                }
        } else {
                resource->buf = buf;
                resource->gpu_address = rscreen->ws->buffer_get_virtual_address(resource->buf);
                resource->bo_size = buf->size;
                resource->bo_alignment = buf->alignment;
                resource->domains = rscreen->ws->buffer_get_initial_domain(resource->buf);
                if (resource->domains & RADEON_DOMAIN_VRAM)
                        resource->vram_usage = buf->size;
                else if (resource->domains & RADEON_DOMAIN_GTT)
                        resource->gart_usage = buf->size;
        }

        if (rtex->cmask.size) {
                /* Initialize the cmask to 0xCC (= compressed state). */
                r600_screen_clear_buffer(rscreen, &rtex->cmask_buffer->b.b,
                                         rtex->cmask.offset, rtex->cmask.size,
                                         0xCCCCCCCC, R600_COHERENCY_NONE);
        }

        /* Initialize DCC only if the texture is not being imported. */
        if (!buf && rtex->dcc_offset) {
                r600_screen_clear_buffer(rscreen, &rtex->resource.b.b,
                                         rtex->dcc_offset,
                                         rtex->surface.dcc_size,
                                         0xFFFFFFFF, R600_COHERENCY_NONE);
        }

        /* Initialize the CMASK base register value. */
        rtex->cmask.base_address_reg =
                (rtex->resource.gpu_address + rtex->cmask.offset) >> 8;

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

        if (rscreen->debug_flags & DBG_TEX) {
                puts("Texture:");
                r600_print_texture_info(rtex, stdout);
                fflush(stdout);
        }

        return rtex;
}

static enum radeon_surf_mode
r600_choose_tiling(struct r600_common_screen *rscreen,
                   const struct pipe_resource *templ)
{
        const struct util_format_description *desc = util_format_description(templ->format);
        bool force_tiling = templ->flags & R600_RESOURCE_FLAG_FORCE_TILING;

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

        /* Transfer resources should be linear. */
        if (templ->flags & R600_RESOURCE_FLAG_TRANSFER)
                return RADEON_SURF_MODE_LINEAR_ALIGNED;

        /* r600g: force tiling on TEXTURE_2D and TEXTURE_3D compute resources. */
        if (rscreen->chip_class >= R600 && rscreen->chip_class <= CAYMAN &&
            (templ->bind & PIPE_BIND_COMPUTE_RESOURCE) &&
            (templ->target == PIPE_TEXTURE_2D ||
             templ->target == PIPE_TEXTURE_3D))
                force_tiling = true;

        /* Handle common candidates for the linear mode.
         * Compressed textures and DB surfaces must always be tiled.
         */
        if (!force_tiling && !util_format_is_compressed(templ->format) &&
            (!util_format_is_depth_or_stencil(templ->format) ||
             templ->flags & R600_RESOURCE_FLAG_FLUSHED_DEPTH)) {
                if (rscreen->debug_flags & DBG_NO_TILING)
                        return RADEON_SURF_MODE_LINEAR_ALIGNED;

                /* Tiling doesn't work with the 422 (SUBSAMPLED) formats on R600+. */
                if (desc->layout == UTIL_FORMAT_LAYOUT_SUBSAMPLED)
                        return RADEON_SURF_MODE_LINEAR_ALIGNED;

                /* Cursors are linear on SI.
                 * (XXX double-check, maybe also use RADEON_SURF_SCANOUT) */
                if (rscreen->chip_class >= SI &&
                    (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 ||
                    templ->height0 <= 4)
                        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 ||
            (rscreen->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 *r600_texture_create(struct pipe_screen *screen,
                                          const struct pipe_resource *templ)
{
        struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
        struct radeon_surf surface = {0};
        bool is_flushed_depth = templ->flags & R600_RESOURCE_FLAG_FLUSHED_DEPTH;
        bool tc_compatible_htile =
                rscreen->chip_class >= VI &&
                (templ->flags & PIPE_RESOURCE_FLAG_TEXTURING_MORE_LIKELY) &&
                !(rscreen->debug_flags & DBG_NO_HYPERZ) &&
                !is_flushed_depth &&
                templ->nr_samples <= 1 && /* TC-compat HTILE is less efficient with MSAA */
                util_format_is_depth_or_stencil(templ->format);

        int r;

        r = r600_init_surface(rscreen, &surface, templ,
                              r600_choose_tiling(rscreen, templ), 0, 0,
                              false, false, is_flushed_depth,
                              tc_compatible_htile);
        if (r) {
                return NULL;
        }

        return (struct pipe_resource *)
               r600_texture_create_object(screen, templ, NULL, &surface);
}

static struct pipe_resource *r600_texture_from_handle(struct pipe_screen *screen,
                                                      const struct pipe_resource *templ,
                                                      struct winsys_handle *whandle,
                                                      unsigned usage)
{
        struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
        struct pb_buffer *buf = NULL;
        unsigned stride = 0, offset = 0;
        unsigned array_mode;
        struct radeon_surf surface;
        int r;
        struct radeon_bo_metadata metadata = {};
        struct r600_texture *rtex;

        /* Support only 2D textures without mipmaps */
        if ((templ->target != PIPE_TEXTURE_2D && templ->target != PIPE_TEXTURE_RECT) ||
              templ->depth0 != 1 || templ->last_level != 0)
                return NULL;

        buf = rscreen->ws->buffer_from_handle(rscreen->ws, whandle, &stride, &offset);
        if (!buf)
                return NULL;

        rscreen->ws->buffer_get_metadata(buf, &metadata);

        surface.pipe_config = metadata.pipe_config;
        surface.bankw = metadata.bankw;
        surface.bankh = metadata.bankh;
        surface.tile_split = metadata.tile_split;
        surface.mtilea = metadata.mtilea;
        surface.num_banks = metadata.num_banks;

        if (metadata.macrotile == RADEON_LAYOUT_TILED)
                array_mode = RADEON_SURF_MODE_2D;
        else if (metadata.microtile == RADEON_LAYOUT_TILED)
                array_mode = RADEON_SURF_MODE_1D;
        else
                array_mode = RADEON_SURF_MODE_LINEAR_ALIGNED;

        r = r600_init_surface(rscreen, &surface, templ, array_mode, stride,
                              offset, true, metadata.scanout, false, false);
        if (r) {
                return NULL;
        }

        rtex = r600_texture_create_object(screen, templ, buf, &surface);
        if (!rtex)
                return NULL;

        rtex->resource.is_shared = true;
        rtex->resource.external_usage = usage;

        if (rscreen->apply_opaque_metadata)
                rscreen->apply_opaque_metadata(rscreen, rtex, &metadata);

        return &rtex->resource.b.b;
}

bool r600_init_flushed_depth_texture(struct pipe_context *ctx,
                                     struct pipe_resource *texture,
                                     struct r600_texture **staging)
{
        struct r600_texture *rtex = (struct r600_texture*)texture;
        struct pipe_resource resource;
        struct r600_texture **flushed_depth_texture = staging ?
                        staging : &rtex->flushed_depth_texture;
        enum pipe_format pipe_format = texture->format;

        if (!staging) {
                if (rtex->flushed_depth_texture)
                        return true; /* it's ready */

                if (!rtex->can_sample_z && rtex->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 (!rtex->can_sample_s && rtex->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 = staging ? PIPE_USAGE_STAGING : PIPE_USAGE_DEFAULT;
        resource.bind = texture->bind & ~PIPE_BIND_DEPTH_STENCIL;
        resource.flags = texture->flags | R600_RESOURCE_FLAG_FLUSHED_DEPTH;

        if (staging)
                resource.flags |= R600_RESOURCE_FLAG_TRANSFER;

        *flushed_depth_texture = (struct r600_texture *)ctx->screen->resource_create(ctx->screen, &resource);
        if (*flushed_depth_texture == NULL) {
                R600_ERR("failed to create temporary texture to hold flushed depth\n");
                return false;
        }

        (*flushed_depth_texture)->non_disp_tiling = 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 r600_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 & R600_RESOURCE_FLAG_TRANSFER ? PIPE_USAGE_STAGING : PIPE_USAGE_DEFAULT;
        res->flags = flags;

        /* 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 r600_can_invalidate_texture(struct r600_common_screen *rscreen,
                                        struct r600_texture *rtex,
                                        unsigned transfer_usage,
                                        const struct pipe_box *box)
{
        /* r600g doesn't react to dirty_tex_descriptor_counter */
        return rscreen->chip_class >= SI &&
                !rtex->resource.is_shared &&
                !(transfer_usage & PIPE_TRANSFER_READ) &&
                rtex->resource.b.b.last_level == 0 &&
                util_texrange_covers_whole_level(&rtex->resource.b.b, 0,
                                                 box->x, box->y, box->z,
                                                 box->width, box->height,
                                                 box->depth);
}

static void r600_texture_invalidate_storage(struct r600_common_context *rctx,
                                            struct r600_texture *rtex)
{
        struct r600_common_screen *rscreen = rctx->screen;

        /* There is no point in discarding depth and tiled buffers. */
        assert(!rtex->is_depth);
        assert(rtex->surface.level[0].mode == RADEON_SURF_MODE_LINEAR_ALIGNED);

        /* Reallocate the buffer in the same pipe_resource. */
        r600_alloc_resource(rscreen, &rtex->resource);

        /* Initialize the CMASK base address (needed even without CMASK). */
        rtex->cmask.base_address_reg =
                (rtex->resource.gpu_address + rtex->cmask.offset) >> 8;

        r600_dirty_all_framebuffer_states(rscreen);
        p_atomic_inc(&rscreen->dirty_tex_descriptor_counter);

        rctx->num_alloc_tex_transfer_bytes += rtex->size;
}

static void *r600_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 r600_common_context *rctx = (struct r600_common_context*)ctx;
        struct r600_texture *rtex = (struct r600_texture*)texture;
        struct r600_transfer *trans;
        struct r600_resource *buf;
        unsigned offset = 0;
        char *map;
        bool use_staging_texture = false;

        assert(!(texture->flags & R600_RESOURCE_FLAG_TRANSFER));

        /* Depth textures use staging unconditionally. */
        if (!rtex->is_depth) {
                /* 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 (!rctx->screen->info.has_dedicated_vram &&
                    level == 0 &&
                    box->width >= 4 && box->height >= 4 &&
                    p_atomic_inc_return(&rtex->num_level0_transfers) == 10) {
                        bool can_invalidate =
                                r600_can_invalidate_texture(rctx->screen, rtex,
                                                            usage, box);

                        r600_degrade_tile_mode_to_linear(rctx, rtex,
                                                         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 is slow, always use the staging texture in
                 * this case.
                 *
                 * Use the staging texture for uploads if the underlying BO
                 * is busy.
                 */
                if (rtex->surface.level[0].mode >= RADEON_SURF_MODE_1D)
                        use_staging_texture = true;
                else if (usage & PIPE_TRANSFER_READ)
                        use_staging_texture = (rtex->resource.domains &
                                               RADEON_DOMAIN_VRAM) != 0;
                /* Write & linear only: */
                else if (r600_rings_is_buffer_referenced(rctx, rtex->resource.buf,
                                                         RADEON_USAGE_READWRITE) ||
                         !rctx->ws->buffer_wait(rtex->resource.buf, 0,
                                                RADEON_USAGE_READWRITE)) {
                        /* It's busy. */
                        if (r600_can_invalidate_texture(rctx->screen, rtex,
                                                        usage, box))
                                r600_texture_invalidate_storage(rctx, rtex);
                        else
                                use_staging_texture = true;
                }
        }

        trans = CALLOC_STRUCT(r600_transfer);
        if (!trans)
                return NULL;
        trans->transfer.resource = texture;
        trans->transfer.level = level;
        trans->transfer.usage = usage;
        trans->transfer.box = *box;

        if (rtex->is_depth) {
                struct r600_texture *staging_depth;

                if (rtex->resource.b.b.nr_samples > 1) {
                        /* MSAA depth buffers need to be converted to single sample buffers.
                         *
                         * Mapping MSAA depth buffers can occur if ReadPixels is called
                         * with a multisample GLX visual.
                         *
                         * First downsample the depth buffer to a temporary texture,
                         * then decompress the temporary one to staging.
                         *
                         * Only the region being mapped is transfered.
                         */
                        struct pipe_resource resource;

                        r600_init_temp_resource_from_box(&resource, texture, box, level, 0);

                        if (!r600_init_flushed_depth_texture(ctx, &resource, &staging_depth)) {
                                R600_ERR("failed to create temporary texture to hold untiled copy\n");
                                FREE(trans);
                                return NULL;
                        }

                        if (usage & PIPE_TRANSFER_READ) {
                                struct pipe_resource *temp = ctx->screen->resource_create(ctx->screen, &resource);
                                if (!temp) {
                                        R600_ERR("failed to create a temporary depth texture\n");
                                        FREE(trans);
                                        return NULL;
                                }

                                r600_copy_region_with_blit(ctx, temp, 0, 0, 0, 0, texture, level, box);
                                rctx->blit_decompress_depth(ctx, (struct r600_texture*)temp, staging_depth,
                                                            0, 0, 0, box->depth, 0, 0);
                                pipe_resource_reference(&temp, NULL);
                        }
                }
                else {
                        /* XXX: only readback the rectangle which is being mapped? */
                        /* XXX: when discard is true, no need to read back from depth texture */
                        if (!r600_init_flushed_depth_texture(ctx, texture, &staging_depth)) {
                                R600_ERR("failed to create temporary texture to hold untiled copy\n");
                                FREE(trans);
                                return NULL;
                        }

                        rctx->blit_decompress_depth(ctx, rtex, staging_depth,
                                                    level, level,
                                                    box->z, box->z + box->depth - 1,
                                                    0, 0);

                        offset = r600_texture_get_offset(staging_depth, level, box);
                }

                trans->transfer.stride = staging_depth->surface.level[level].pitch_bytes;
                trans->transfer.layer_stride = staging_depth->surface.level[level].slice_size;
                trans->staging = (struct r600_resource*)staging_depth;
                buf = trans->staging;
        } else if (use_staging_texture) {
                struct pipe_resource resource;
                struct r600_texture *staging;

                r600_init_temp_resource_from_box(&resource, texture, box, level,
                                                 R600_RESOURCE_FLAG_TRANSFER);
                resource.usage = (usage & PIPE_TRANSFER_READ) ?
                        PIPE_USAGE_STAGING : PIPE_USAGE_STREAM;

                /* Create the temporary texture. */
                staging = (struct r600_texture*)ctx->screen->resource_create(ctx->screen, &resource);
                if (!staging) {
                        R600_ERR("failed to create temporary texture to hold untiled copy\n");
                        FREE(trans);
                        return NULL;
                }
                trans->staging = &staging->resource;
                trans->transfer.stride = staging->surface.level[0].pitch_bytes;
                trans->transfer.layer_stride = staging->surface.level[0].slice_size;

                if (usage & PIPE_TRANSFER_READ)
                        r600_copy_to_staging_texture(ctx, trans);
                else
                        usage |= PIPE_TRANSFER_UNSYNCHRONIZED;

                buf = trans->staging;
        } else {
                /* the resource is mapped directly */
                trans->transfer.stride = rtex->surface.level[level].pitch_bytes;
                trans->transfer.layer_stride = rtex->surface.level[level].slice_size;
                offset = r600_texture_get_offset(rtex, level, box);
                buf = &rtex->resource;
        }

        if (!(map = r600_buffer_map_sync_with_rings(rctx, buf, usage))) {
                r600_resource_reference(&trans->staging, NULL);
                FREE(trans);
                return NULL;
        }

        *ptransfer = &trans->transfer;
        return map + offset;
}

static void r600_texture_transfer_unmap(struct pipe_context *ctx,
                                        struct pipe_transfer* transfer)
{
        struct r600_common_context *rctx = (struct r600_common_context*)ctx;
        struct r600_transfer *rtransfer = (struct r600_transfer*)transfer;
        struct pipe_resource *texture = transfer->resource;
        struct r600_texture *rtex = (struct r600_texture*)texture;

        if ((transfer->usage & PIPE_TRANSFER_WRITE) && rtransfer->staging) {
                if (rtex->is_depth && rtex->resource.b.b.nr_samples <= 1) {
                        ctx->resource_copy_region(ctx, texture, transfer->level,
                                                  transfer->box.x, transfer->box.y, transfer->box.z,
                                                  &rtransfer->staging->b.b, transfer->level,
                                                  &transfer->box);
                } else {
                        r600_copy_from_staging_texture(ctx, rtransfer);
                }
        }

        if (rtransfer->staging) {
                rctx->num_alloc_tex_transfer_bytes += rtransfer->staging->buf->size;
                r600_resource_reference(&rtransfer->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 (rctx->num_alloc_tex_transfer_bytes > rctx->screen->info.gart_size / 4) {
                rctx->gfx.flush(rctx, RADEON_FLUSH_ASYNC, NULL);
                rctx->num_alloc_tex_transfer_bytes = 0;
        }

        FREE(transfer);
}

static const struct u_resource_vtbl r600_texture_vtbl =
{
        NULL,                           /* get_handle */
        r600_texture_destroy,           /* resource_destroy */
        r600_texture_transfer_map,      /* transfer_map */
        u_default_transfer_flush_region, /* transfer_flush_region */
        r600_texture_transfer_unmap,    /* transfer_unmap */
};

/* DCC channel type categories within which formats can be reinterpreted
 * while keeping the same DCC encoding. The swizzle must also match. */
enum dcc_channel_type {
        dcc_channel_float32,
        dcc_channel_uint32,
        dcc_channel_sint32,
        dcc_channel_float16,
        dcc_channel_uint16,
        dcc_channel_sint16,
        dcc_channel_uint_10_10_10_2,
        dcc_channel_uint8,
        dcc_channel_sint8,
        dcc_channel_incompatible,
};

/* Return the type of DCC encoding. */
static enum dcc_channel_type
vi_get_dcc_channel_type(const struct util_format_description *desc)
{
        int i;

        /* Find the first non-void channel. */
        for (i = 0; i < desc->nr_channels; i++)
                if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID)
                        break;
        if (i == desc->nr_channels)
                return dcc_channel_incompatible;

        switch (desc->channel[i].size) {
        case 32:
                if (desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT)
                        return dcc_channel_float32;
                if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED)
                        return dcc_channel_uint32;
                return dcc_channel_sint32;
        case 16:
                if (desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT)
                        return dcc_channel_float16;
                if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED)
                        return dcc_channel_uint16;
                return dcc_channel_sint16;
        case 10:
                return dcc_channel_uint_10_10_10_2;
        case 8:
                if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED)
                        return dcc_channel_uint8;
                return dcc_channel_sint8;
        default:
                return dcc_channel_incompatible;
        }
}

/* Return if it's allowed to reinterpret one format as another with DCC enabled. */
bool vi_dcc_formats_compatible(enum pipe_format format1,
                               enum pipe_format format2)
{
        const struct util_format_description *desc1, *desc2;
        enum dcc_channel_type type1, type2;
        int i;

        if (format1 == format2)
                return true;

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

        if (desc1->nr_channels != desc2->nr_channels)
                return false;

        /* Swizzles must be the same. */
        for (i = 0; i < desc1->nr_channels; i++)
                if (desc1->swizzle[i] <= PIPE_SWIZZLE_W &&
                    desc2->swizzle[i] <= PIPE_SWIZZLE_W &&
                    desc1->swizzle[i] != desc2->swizzle[i])
                        return false;

        type1 = vi_get_dcc_channel_type(desc1);
        type2 = vi_get_dcc_channel_type(desc2);

        return type1 != dcc_channel_incompatible &&
               type2 != dcc_channel_incompatible &&
               type1 == type2;
}

void vi_dcc_disable_if_incompatible_format(struct r600_common_context *rctx,
                                           struct pipe_resource *tex,
                                           unsigned level,
                                           enum pipe_format view_format)
{
        struct r600_texture *rtex = (struct r600_texture *)tex;

        if (rtex->dcc_offset &&
            level < rtex->surface.num_dcc_levels &&
            !vi_dcc_formats_compatible(tex->format, view_format))
                if (!r600_texture_disable_dcc(rctx, (struct r600_texture*)tex))
                        rctx->decompress_dcc(&rctx->b, rtex);
}

struct pipe_surface *r600_create_surface_custom(struct pipe_context *pipe,
                                                struct pipe_resource *texture,
                                                const struct pipe_surface *templ,
                                                unsigned width, unsigned height)
{
        struct r600_common_context *rctx = (struct r600_common_context*)pipe;
        struct r600_texture *rtex = (struct r600_texture*)texture;
        struct r600_surface *surface = CALLOC_STRUCT(r600_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->level_info = &rtex->surface.level[templ->u.tex.level];

        if (texture->target != PIPE_BUFFER)
                vi_dcc_disable_if_incompatible_format(rctx, texture,
                                                      templ->u.tex.level,
                                                      templ->format);

        return &surface->base;
}

static struct pipe_surface *r600_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);

        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;
                }
        }

        return r600_create_surface_custom(pipe, tex, templ, width, height);
}

static void r600_surface_destroy(struct pipe_context *pipe,
                                 struct pipe_surface *surface)
{
        struct r600_surface *surf = (struct r600_surface*)surface;
        r600_resource_reference(&surf->cb_buffer_fmask, NULL);
        r600_resource_reference(&surf->cb_buffer_cmask, NULL);
        pipe_resource_reference(&surface->texture, NULL);
        FREE(surface);
}

static void r600_clear_texture(struct pipe_context *pipe,
                               struct pipe_resource *tex,
                               unsigned level,
                               const struct pipe_box *box,
                               const void *data)
{
        struct pipe_screen *screen = pipe->screen;
        struct r600_texture *rtex = (struct r600_texture*)tex;
        struct pipe_surface tmpl = {{0}};
        struct pipe_surface *sf;
        const struct util_format_description *desc =
                util_format_description(tex->format);

        tmpl.format = tex->format;
        tmpl.u.tex.first_layer = box->z;
        tmpl.u.tex.last_layer = box->z + box->depth - 1;
        tmpl.u.tex.level = level;
        sf = pipe->create_surface(pipe, tex, &tmpl);
        if (!sf)
                return;

        if (rtex->is_depth) {
                unsigned clear;
                float depth;
                uint8_t stencil = 0;

                /* Depth is always present. */
                clear = PIPE_CLEAR_DEPTH;
                desc->unpack_z_float(&depth, 0, data, 0, 1, 1);

                if (rtex->surface.flags & RADEON_SURF_SBUFFER) {
                        clear |= PIPE_CLEAR_STENCIL;
                        desc->unpack_s_8uint(&stencil, 0, data, 0, 1, 1);
                }

                pipe->clear_depth_stencil(pipe, sf, clear, depth, stencil,
                                          box->x, box->y,
                                          box->width, box->height, false);
        } else {
                union pipe_color_union color;

                /* pipe_color_union requires the full vec4 representation. */
                if (util_format_is_pure_uint(tex->format))
                        desc->unpack_rgba_uint(color.ui, 0, data, 0, 1, 1);
                else if (util_format_is_pure_sint(tex->format))
                        desc->unpack_rgba_sint(color.i, 0, data, 0, 1, 1);
                else
                        desc->unpack_rgba_float(color.f, 0, data, 0, 1, 1);

                if (screen->is_format_supported(screen, tex->format,
                                                tex->target, 0,
                                                PIPE_BIND_RENDER_TARGET)) {
                        pipe->clear_render_target(pipe, sf, &color,
                                                  box->x, box->y,
                                                  box->width, box->height, false);
                } else {
                        /* Software fallback - just for R9G9B9E5_FLOAT */
                        util_clear_render_target(pipe, sf, &color,
                                                 box->x, box->y,
                                                 box->width, box->height);
                }
        }
        pipe_surface_reference(&sf, NULL);
}

unsigned r600_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_0280A0_SWAP_STD;

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

        switch (desc->nr_channels) {
        case 1:
                if (HAS_SWIZZLE(0,X))
                        return V_0280A0_SWAP_STD; /* X___ */
                else if (HAS_SWIZZLE(3,X))
                        return V_0280A0_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_0280A0_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_0280A0_SWAP_STD : V_0280A0_SWAP_STD_REV);
                else if (HAS_SWIZZLE(0,X) && HAS_SWIZZLE(3,Y))
                        return V_0280A0_SWAP_ALT; /* X__Y */
                else if (HAS_SWIZZLE(0,Y) && HAS_SWIZZLE(3,X))
                        return V_0280A0_SWAP_ALT_REV; /* Y__X */
                break;
        case 3:
                if (HAS_SWIZZLE(0,X))
                        return (do_endian_swap ? V_0280A0_SWAP_STD_REV : V_0280A0_SWAP_STD);
                else if (HAS_SWIZZLE(0,Z))
                        return V_0280A0_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_0280A0_SWAP_STD; /* XYZW */
                } else if (HAS_SWIZZLE(1,Z) && HAS_SWIZZLE(2,Y)) {
                        return V_0280A0_SWAP_STD_REV; /* WZYX */
                } else if (HAS_SWIZZLE(1,Y) && HAS_SWIZZLE(2,X)) {
                        return V_0280A0_SWAP_ALT; /* ZYXW */
                } else if (HAS_SWIZZLE(1,Z) && HAS_SWIZZLE(2,W)) {
                        /* YZWX */
                        if (desc->is_array)
                                return V_0280A0_SWAP_ALT_REV;
                        else
                                return (do_endian_swap ? V_0280A0_SWAP_ALT : V_0280A0_SWAP_ALT_REV);
                }
                break;
        }
        return ~0U;
}

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

static void vi_dcc_clean_up_context_slot(struct r600_common_context *rctx,
                                         int slot)
{
        int i;

        if (rctx->dcc_stats[slot].query_active)
                vi_separate_dcc_stop_query(&rctx->b,
                                           rctx->dcc_stats[slot].tex);

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

        r600_texture_reference(&rctx->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 r600_common_context *rctx,
                                               struct r600_texture *tex)
{
        int i, empty_slot = -1;

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

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

                /* Record the first seen empty slot. */
                if (empty_slot == -1 && !rctx->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(rctx->dcc_stats); i++)
                        if (rctx->dcc_stats[oldest_slot].last_use_timestamp >
                            rctx->dcc_stats[i].last_use_timestamp)
                                oldest_slot = i;

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

        /* Add the texture to the new slot. */
        r600_texture_reference(&rctx->dcc_stats[empty_slot].tex, tex);
        rctx->dcc_stats[empty_slot].last_use_timestamp = os_time_get();
        return empty_slot;
}

static struct pipe_query *
vi_create_resuming_pipestats_query(struct pipe_context *ctx)
{
        struct r600_query_hw *query = (struct r600_query_hw*)
                ctx->create_query(ctx, PIPE_QUERY_PIPELINE_STATISTICS, 0);

        query->flags |= R600_QUERY_HW_FLAG_BEGIN_RESUMES;
        return (struct pipe_query*)query;
}

/**
 * Called when binding a color buffer.
 */
void vi_separate_dcc_start_query(struct pipe_context *ctx,
                                 struct r600_texture *tex)
{
        struct r600_common_context *rctx = (struct r600_common_context*)ctx;
        unsigned i = vi_get_context_dcc_stats_index(rctx, tex);

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

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

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

/**
 * Called when unbinding a color buffer.
 */
void vi_separate_dcc_stop_query(struct pipe_context *ctx,
                                struct r600_texture *tex)
{
        struct r600_common_context *rctx = (struct r600_common_context*)ctx;
        unsigned i = vi_get_context_dcc_stats_index(rctx, tex);

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

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

static bool vi_should_enable_separate_dcc(struct r600_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. */
static void vi_separate_dcc_try_enable(struct r600_common_context *rctx,
                                       struct r600_texture *tex)
{
        /* The intent is to use this with shared displayable back buffers,
         * but it's not strictly limited only to them.
         */
        if (!tex->resource.is_shared ||
            !(tex->resource.external_usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH) ||
            tex->resource.b.b.target != PIPE_TEXTURE_2D ||
            tex->resource.b.b.last_level > 0 ||
            !tex->surface.dcc_size)
                return;

        if (tex->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(&rctx->b, 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);

        r600_texture_discard_cmask(rctx->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 = (struct r600_resource*)
                        r600_aligned_buffer_create(rctx->b.screen, 0,
                                                   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->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 r600_texture *tex)
{
        struct r600_common_context *rctx = (struct r600_common_context*)ctx;
        struct pipe_query *tmp;
        unsigned i = vi_get_context_dcc_stats_index(rctx, tex);
        bool query_active = rctx->dcc_stats[i].query_active;
        bool disable = false;

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

                /* Read the results. */
                ctx->get_query_result(ctx, rctx->dcc_stats[i].ps_stats[2],
                                      true, &result);
                r600_query_hw_reset_buffers(rctx,
                                            (struct r600_query_hw*)
                                            rctx->dcc_stats[i].ps_stats[2]);

                /* Compute the approximate number of fullscreen draws. */
                tex->ps_draw_ratio =
                        result.pipeline_statistics.ps_invocations /
                        (tex->resource.b.b.width0 * tex->resource.b.b.height0);
                rctx->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(ctx, tex);

        /* Move the queries in the queue by one. */
        tmp = rctx->dcc_stats[i].ps_stats[2];
        rctx->dcc_stats[i].ps_stats[2] = rctx->dcc_stats[i].ps_stats[1];
        rctx->dcc_stats[i].ps_stats[1] = rctx->dcc_stats[i].ps_stats[0];
        rctx->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(ctx, tex);

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

/* FAST COLOR CLEAR */

static void evergreen_set_clear_color(struct r600_texture *rtex,
                                      enum pipe_format surface_format,
                                      const union pipe_color_union *color)
{
        union util_color uc;

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

        if (rtex->surface.bpe == 16) {
                /* DCC fast clear only:
                 *   CLEAR_WORD0 = R = G = B
                 *   CLEAR_WORD1 = A
                 */
                assert(color->ui[0] == color->ui[1] &&
                       color->ui[0] == color->ui[2]);
                uc.ui[0] = color->ui[0];
                uc.ui[1] = color->ui[3];
        } else if (util_format_is_pure_uint(surface_format)) {
                util_format_write_4ui(surface_format, color->ui, 0, &uc, 0, 0, 0, 1, 1);
        } else if (util_format_is_pure_sint(surface_format)) {
                util_format_write_4i(surface_format, color->i, 0, &uc, 0, 0, 0, 1, 1);
        } else {
                util_pack_color(color->f, surface_format, &uc);
        }

        memcpy(rtex->color_clear_value, &uc, 2 * sizeof(uint32_t));
}

static bool vi_get_fast_clear_parameters(enum pipe_format surface_format,
                                         const union pipe_color_union *color,
                                         uint32_t* reset_value,
                                         bool* clear_words_needed)
{
        bool values[4] = {};
        int i;
        bool main_value = false;
        bool extra_value = false;
        int extra_channel;
        const struct util_format_description *desc = util_format_description(surface_format);

        if (desc->block.bits == 128 &&
            (color->ui[0] != color->ui[1] ||
             color->ui[0] != color->ui[2]))
                return false;

        *clear_words_needed = true;
        *reset_value = 0x20202020U;

        /* If we want to clear without needing a fast clear eliminate step, we
         * can set each channel to 0 or 1 (or 0/max for integer formats). We
         * have two sets of flags, one for the last or first channel(extra) and
         * one for the other channels(main).
         */

        if (surface_format == PIPE_FORMAT_R11G11B10_FLOAT ||
            surface_format == PIPE_FORMAT_B5G6R5_UNORM ||
            surface_format == PIPE_FORMAT_B5G6R5_SRGB) {
                extra_channel = -1;
        } else if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
                if(r600_translate_colorswap(surface_format, false) <= 1)
                        extra_channel = desc->nr_channels - 1;
                else
                        extra_channel = 0;
        } else
                return true;

        for (i = 0; i < 4; ++i) {
                int index = desc->swizzle[i] - PIPE_SWIZZLE_X;

                if (desc->swizzle[i] < PIPE_SWIZZLE_X ||
                    desc->swizzle[i] > PIPE_SWIZZLE_W)
                        continue;

                if (desc->channel[i].pure_integer &&
                    desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED) {
                        /* Use the maximum value for clamping the clear color. */
                        int max = u_bit_consecutive(0, desc->channel[i].size - 1);

                        values[i] = color->i[i] != 0;
                        if (color->i[i] != 0 && MIN2(color->i[i], max) != max)
                                return true;
                } else if (desc->channel[i].pure_integer &&
                           desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED) {
                        /* Use the maximum value for clamping the clear color. */
                        unsigned max = u_bit_consecutive(0, desc->channel[i].size);

                        values[i] = color->ui[i] != 0U;
                        if (color->ui[i] != 0U && MIN2(color->ui[i], max) != max)
                                return true;
                } else {
                        values[i] = color->f[i] != 0.0F;
                        if (color->f[i] != 0.0F && color->f[i] != 1.0F)
                                return true;
                }

                if (index == extra_channel)
                        extra_value = values[i];
                else
                        main_value = values[i];
        }

        for (int i = 0; i < 4; ++i)
                if (values[i] != main_value &&
                    desc->swizzle[i] - PIPE_SWIZZLE_X != extra_channel &&
                    desc->swizzle[i] >= PIPE_SWIZZLE_X &&
                    desc->swizzle[i] <= PIPE_SWIZZLE_W)
                        return true;

        *clear_words_needed = false;
        if (main_value)
                *reset_value |= 0x80808080U;

        if (extra_value)
                *reset_value |= 0x40404040U;
        return true;
}

void vi_dcc_clear_level(struct r600_common_context *rctx,
                        struct r600_texture *rtex,
                        unsigned level, unsigned clear_value)
{
        struct pipe_resource *dcc_buffer;
        uint64_t dcc_offset;

        assert(rtex->dcc_offset && level < rtex->surface.num_dcc_levels);

        if (rtex->dcc_separate_buffer) {
                dcc_buffer = &rtex->dcc_separate_buffer->b.b;
                dcc_offset = 0;
        } else {
                dcc_buffer = &rtex->resource.b.b;
                dcc_offset = rtex->dcc_offset;
        }

        dcc_offset += rtex->surface.level[level].dcc_offset;

        rctx->clear_buffer(&rctx->b, dcc_buffer, dcc_offset,
                           rtex->surface.level[level].dcc_fast_clear_size,
                           clear_value, R600_COHERENCY_CB_META);
}

/* Set the same micro tile mode as the destination of the last MSAA resolve.
 * This allows hitting the MSAA resolve fast path, which requires that both
 * src and dst micro tile modes match.
 */
static void si_set_optimal_micro_tile_mode(struct r600_common_screen *rscreen,
                                           struct r600_texture *rtex)
{
        if (rtex->resource.is_shared ||
            rtex->resource.b.b.nr_samples <= 1 ||
            rtex->surface.micro_tile_mode == rtex->last_msaa_resolve_target_micro_mode)
                return;

        assert(rtex->surface.level[0].mode == RADEON_SURF_MODE_2D);
        assert(rtex->resource.b.b.last_level == 0);

        /* These magic numbers were copied from addrlib. It doesn't use any
         * definitions for them either. They are all 2D_TILED_THIN1 modes with
         * different bpp and micro tile mode.
         */
        if (rscreen->chip_class >= CIK) {
                switch (rtex->last_msaa_resolve_target_micro_mode) {
                case 0: /* displayable */
                        rtex->surface.tiling_index[0] = 10;
                        break;
                case 1: /* thin */
                        rtex->surface.tiling_index[0] = 14;
                        break;
                case 3: /* rotated */
                        rtex->surface.tiling_index[0] = 28;
                        break;
                default: /* depth, thick */
                        assert(!"unexpected micro mode");
                        return;
                }
        } else { /* SI */
                switch (rtex->last_msaa_resolve_target_micro_mode) {
                case 0: /* displayable */
                        switch (rtex->surface.bpe) {
                        case 1:
                            rtex->surface.tiling_index[0] = 10;
                            break;
                        case 2:
                            rtex->surface.tiling_index[0] = 11;
                            break;
                        default: /* 4, 8 */
                            rtex->surface.tiling_index[0] = 12;
                            break;
                        }
                        break;
                case 1: /* thin */
                        switch (rtex->surface.bpe) {
                        case 1:
                                rtex->surface.tiling_index[0] = 14;
                                break;
                        case 2:
                                rtex->surface.tiling_index[0] = 15;
                                break;
                        case 4:
                                rtex->surface.tiling_index[0] = 16;
                                break;
                        default: /* 8, 16 */
                                rtex->surface.tiling_index[0] = 17;
                                break;
                        }
                        break;
                default: /* depth, thick */
                        assert(!"unexpected micro mode");
                        return;
                }
        }

        rtex->surface.micro_tile_mode = rtex->last_msaa_resolve_target_micro_mode;

        p_atomic_inc(&rscreen->dirty_fb_counter);
        p_atomic_inc(&rscreen->dirty_tex_descriptor_counter);
}

void evergreen_do_fast_color_clear(struct r600_common_context *rctx,
                                   struct pipe_framebuffer_state *fb,
                                   struct r600_atom *fb_state,
                                   unsigned *buffers, unsigned *dirty_cbufs,
                                   const union pipe_color_union *color)
{
        int i;

        /* This function is broken in BE, so just disable this path for now */
#ifdef PIPE_ARCH_BIG_ENDIAN
        return;
#endif

        if (rctx->render_cond)
                return;

        for (i = 0; i < fb->nr_cbufs; i++) {
                struct r600_texture *tex;
                unsigned clear_bit = PIPE_CLEAR_COLOR0 << i;

                if (!fb->cbufs[i])
                        continue;

                /* if this colorbuffer is not being cleared */
                if (!(*buffers & clear_bit))
                        continue;

                tex = (struct r600_texture *)fb->cbufs[i]->texture;

                /* the clear is allowed if all layers are bound */
                if (fb->cbufs[i]->u.tex.first_layer != 0 ||
                    fb->cbufs[i]->u.tex.last_layer != util_max_layer(&tex->resource.b.b, 0)) {
                        continue;
                }

                /* cannot clear mipmapped textures */
                if (fb->cbufs[i]->texture->last_level != 0) {
                        continue;
                }

                /* only supported on tiled surfaces */
                if (tex->surface.level[0].mode < RADEON_SURF_MODE_1D) {
                        continue;
                }

                /* shared textures can't use fast clear without an explicit flush,
                 * because there is no way to communicate the clear color among
                 * all clients
                 */
                if (tex->resource.is_shared &&
                    !(tex->resource.external_usage & PIPE_HANDLE_USAGE_EXPLICIT_FLUSH))
                        continue;

                /* fast color clear with 1D tiling doesn't work on old kernels and CIK */
                if (tex->surface.level[0].mode == RADEON_SURF_MODE_1D &&
                    rctx->chip_class >= CIK &&
                    rctx->screen->info.drm_major == 2 &&
                    rctx->screen->info.drm_minor < 38) {
                        continue;
                }

                /* Fast clear is the most appropriate place to enable DCC for
                 * displayable surfaces.
                 */
                if (rctx->chip_class >= VI &&
                    !(rctx->screen->debug_flags & DBG_NO_DCC_FB)) {
                        vi_separate_dcc_try_enable(rctx, tex);

                        /* Stoney can't do a CMASK-based clear, so all clears are
                         * considered to be hypothetically slow clears, which
                         * is weighed when determining to enable separate DCC.
                         */
                        if (tex->dcc_gather_statistics &&
                            rctx->family == CHIP_STONEY)
                                tex->num_slow_clears++;
                }

                /* Try to clear DCC first, otherwise try CMASK. */
                if (tex->dcc_offset && tex->surface.num_dcc_levels) {
                        uint32_t reset_value;
                        bool clear_words_needed;

                        if (rctx->screen->debug_flags & DBG_NO_DCC_CLEAR)
                                continue;

                        if (!vi_get_fast_clear_parameters(fb->cbufs[i]->format,
                                                          color, &reset_value,
                                                          &clear_words_needed))
                                continue;

                        vi_dcc_clear_level(rctx, tex, 0, reset_value);

                        if (clear_words_needed)
                                tex->dirty_level_mask |= 1 << fb->cbufs[i]->u.tex.level;
                        tex->separate_dcc_dirty = true;
                } else {
                        /* 128-bit formats are unusupported */
                        if (tex->surface.bpe > 8) {
                                continue;
                        }

                        /* Stoney/RB+ doesn't work with CMASK fast clear. */
                        if (rctx->family == CHIP_STONEY)
                                continue;

                        /* ensure CMASK is enabled */
                        r600_texture_alloc_cmask_separate(rctx->screen, tex);
                        if (tex->cmask.size == 0) {
                                continue;
                        }

                        /* Do the fast clear. */
                        rctx->clear_buffer(&rctx->b, &tex->cmask_buffer->b.b,
                                           tex->cmask.offset, tex->cmask.size, 0,
                                           R600_COHERENCY_CB_META);

                        tex->dirty_level_mask |= 1 << fb->cbufs[i]->u.tex.level;
                }

                /* We can change the micro tile mode before a full clear. */
                if (rctx->screen->chip_class >= SI)
                        si_set_optimal_micro_tile_mode(rctx->screen, tex);

                evergreen_set_clear_color(tex, fb->cbufs[i]->format, color);

                if (dirty_cbufs)
                        *dirty_cbufs |= 1 << i;
                rctx->set_atom_dirty(rctx, fb_state, true);
                *buffers &= ~clear_bit;
        }
}

void r600_init_screen_texture_functions(struct r600_common_screen *rscreen)
{
        rscreen->b.resource_from_handle = r600_texture_from_handle;
        rscreen->b.resource_get_handle = r600_texture_get_handle;
}

void r600_init_context_texture_functions(struct r600_common_context *rctx)
{
        rctx->b.create_surface = r600_create_surface;
        rctx->b.surface_destroy = r600_surface_destroy;
        rctx->b.clear_texture = r600_clear_texture;
}