radeonsi: clean up decompress flags in fast color clear

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

/*
 * Copyright 2010 Jerome Glisse <glisse@freedesktop.org>
 * Copyright 2018 Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "si_pipe.h"
#include "si_public.h"
#include "si_shader_internal.h"
#include "sid.h"

#include "ac_llvm_util.h"
#include "radeon/radeon_uvd.h"
#include "gallivm/lp_bld_misc.h"
#include "util/disk_cache.h"
#include "util/u_log.h"
#include "util/u_memory.h"
#include "util/u_suballoc.h"
#include "util/u_tests.h"
#include "util/u_upload_mgr.h"
#include "util/xmlconfig.h"
#include "vl/vl_decoder.h"
#include "driver_ddebug/dd_util.h"

static const struct debug_named_value debug_options[] = {
        /* Shader logging options: */
        { "vs", DBG(VS), "Print vertex shaders" },
        { "ps", DBG(PS), "Print pixel shaders" },
        { "gs", DBG(GS), "Print geometry shaders" },
        { "tcs", DBG(TCS), "Print tessellation control shaders" },
        { "tes", DBG(TES), "Print tessellation evaluation shaders" },
        { "cs", DBG(CS), "Print compute shaders" },
        { "noir", DBG(NO_IR), "Don't print the LLVM IR"},
        { "notgsi", DBG(NO_TGSI), "Don't print the TGSI"},
        { "noasm", DBG(NO_ASM), "Don't print disassembled shaders"},
        { "preoptir", DBG(PREOPT_IR), "Print the LLVM IR before initial optimizations" },

        /* Shader compiler options the shader cache should be aware of: */
        { "unsafemath", DBG(UNSAFE_MATH), "Enable unsafe math shader optimizations" },
        { "sisched", DBG(SI_SCHED), "Enable LLVM SI Machine Instruction Scheduler." },
        { "gisel", DBG(GISEL), "Enable LLVM global instruction selector." },

        /* Shader compiler options (with no effect on the shader cache): */
        { "checkir", DBG(CHECK_IR), "Enable additional sanity checks on shader IR" },
        { "nir", DBG(NIR), "Enable experimental NIR shaders" },
        { "mono", DBG(MONOLITHIC_SHADERS), "Use old-style monolithic shaders compiled on demand" },
        { "nooptvariant", DBG(NO_OPT_VARIANT), "Disable compiling optimized shader variants." },

        /* Information logging options: */
        { "info", DBG(INFO), "Print driver information" },
        { "tex", DBG(TEX), "Print texture info" },
        { "compute", DBG(COMPUTE), "Print compute info" },
        { "vm", DBG(VM), "Print virtual addresses when creating resources" },

        /* Driver options: */
        { "forcedma", DBG(FORCE_DMA), "Use asynchronous DMA for all operations when possible." },
        { "nodma", DBG(NO_ASYNC_DMA), "Disable asynchronous DMA" },
        { "nowc", DBG(NO_WC), "Disable GTT write combining" },
        { "check_vm", DBG(CHECK_VM), "Check VM faults and dump debug info." },
        { "reserve_vmid", DBG(RESERVE_VMID), "Force VMID reservation per context." },
        { "zerovram", DBG(ZERO_VRAM), "Clear VRAM allocations." },

        /* 3D engine options: */
        { "switch_on_eop", DBG(SWITCH_ON_EOP), "Program WD/IA to switch on end-of-packet." },
        { "nooutoforder", DBG(NO_OUT_OF_ORDER), "Disable out-of-order rasterization" },
        { "nodpbb", DBG(NO_DPBB), "Disable DPBB." },
        { "nodfsm", DBG(NO_DFSM), "Disable DFSM." },
        { "dpbb", DBG(DPBB), "Enable DPBB." },
        { "dfsm", DBG(DFSM), "Enable DFSM." },
        { "nohyperz", DBG(NO_HYPERZ), "Disable Hyper-Z" },
        { "norbplus", DBG(NO_RB_PLUS), "Disable RB+." },
        { "no2d", DBG(NO_2D_TILING), "Disable 2D tiling" },
        { "notiling", DBG(NO_TILING), "Disable tiling" },
        { "nodcc", DBG(NO_DCC), "Disable DCC." },
        { "nodccclear", DBG(NO_DCC_CLEAR), "Disable DCC fast clear." },
        { "nodccfb", DBG(NO_DCC_FB), "Disable separate DCC on the main framebuffer" },
        { "nodccmsaa", DBG(NO_DCC_MSAA), "Disable DCC for MSAA" },
        { "nofmask", DBG(NO_FMASK), "Disable MSAA compression" },

        /* Tests: */
        { "testdma", DBG(TEST_DMA), "Invoke SDMA tests and exit." },
        { "testvmfaultcp", DBG(TEST_VMFAULT_CP), "Invoke a CP VM fault test and exit." },
        { "testvmfaultsdma", DBG(TEST_VMFAULT_SDMA), "Invoke a SDMA VM fault test and exit." },
        { "testvmfaultshader", DBG(TEST_VMFAULT_SHADER), "Invoke a shader VM fault test and exit." },
        { "testdmaperf", DBG(TEST_DMA_PERF), "Test DMA performance" },
        { "testgds", DBG(TEST_GDS), "Test GDS." },

        DEBUG_NAMED_VALUE_END /* must be last */
};

static void si_init_compiler(struct si_screen *sscreen,
                             struct ac_llvm_compiler *compiler)
{
        /* Only create the less-optimizing version of the compiler on APUs
         * predating Ryzen (Raven). */
        bool create_low_opt_compiler = !sscreen->info.has_dedicated_vram &&
                                       sscreen->info.chip_class <= VI;

        enum ac_target_machine_options tm_options =
                (sscreen->debug_flags & DBG(SI_SCHED) ? AC_TM_SISCHED : 0) |
                (sscreen->debug_flags & DBG(GISEL) ? AC_TM_ENABLE_GLOBAL_ISEL : 0) |
                (sscreen->info.chip_class >= GFX9 ? AC_TM_FORCE_ENABLE_XNACK : 0) |
                (sscreen->info.chip_class < GFX9 ? AC_TM_FORCE_DISABLE_XNACK : 0) |
                (!sscreen->llvm_has_working_vgpr_indexing ? AC_TM_PROMOTE_ALLOCA_TO_SCRATCH : 0) |
                (sscreen->debug_flags & DBG(CHECK_IR) ? AC_TM_CHECK_IR : 0) |
                (create_low_opt_compiler ? AC_TM_CREATE_LOW_OPT : 0);

        ac_init_llvm_once();
        ac_init_llvm_compiler(compiler, true, sscreen->info.family, tm_options);
        compiler->passes = ac_create_llvm_passes(compiler->tm);

        if (compiler->low_opt_tm)
                compiler->low_opt_passes = ac_create_llvm_passes(compiler->low_opt_tm);
}

static void si_destroy_compiler(struct ac_llvm_compiler *compiler)
{
        ac_destroy_llvm_passes(compiler->passes);
        ac_destroy_llvm_passes(compiler->low_opt_passes);
        ac_destroy_llvm_compiler(compiler);
}

/*
 * pipe_context
 */
static void si_destroy_context(struct pipe_context *context)
{
        struct si_context *sctx = (struct si_context *)context;
        int i;

        /* Unreference the framebuffer normally to disable related logic
         * properly.
         */
        struct pipe_framebuffer_state fb = {};
        if (context->set_framebuffer_state)
                context->set_framebuffer_state(context, &fb);

        si_release_all_descriptors(sctx);

        pipe_resource_reference(&sctx->esgs_ring, NULL);
        pipe_resource_reference(&sctx->gsvs_ring, NULL);
        pipe_resource_reference(&sctx->tess_rings, NULL);
        pipe_resource_reference(&sctx->null_const_buf.buffer, NULL);
        pipe_resource_reference(&sctx->sample_pos_buffer, NULL);
        r600_resource_reference(&sctx->border_color_buffer, NULL);
        free(sctx->border_color_table);
        r600_resource_reference(&sctx->scratch_buffer, NULL);
        r600_resource_reference(&sctx->compute_scratch_buffer, NULL);
        r600_resource_reference(&sctx->wait_mem_scratch, NULL);

        si_pm4_free_state(sctx, sctx->init_config, ~0);
        if (sctx->init_config_gs_rings)
                si_pm4_free_state(sctx, sctx->init_config_gs_rings, ~0);
        for (i = 0; i < ARRAY_SIZE(sctx->vgt_shader_config); i++)
                si_pm4_delete_state(sctx, vgt_shader_config, sctx->vgt_shader_config[i]);

        if (sctx->fixed_func_tcs_shader.cso)
                sctx->b.delete_tcs_state(&sctx->b, sctx->fixed_func_tcs_shader.cso);
        if (sctx->custom_dsa_flush)
                sctx->b.delete_depth_stencil_alpha_state(&sctx->b, sctx->custom_dsa_flush);
        if (sctx->custom_blend_resolve)
                sctx->b.delete_blend_state(&sctx->b, sctx->custom_blend_resolve);
        if (sctx->custom_blend_fmask_decompress)
                sctx->b.delete_blend_state(&sctx->b, sctx->custom_blend_fmask_decompress);
        if (sctx->custom_blend_eliminate_fastclear)
                sctx->b.delete_blend_state(&sctx->b, sctx->custom_blend_eliminate_fastclear);
        if (sctx->custom_blend_dcc_decompress)
                sctx->b.delete_blend_state(&sctx->b, sctx->custom_blend_dcc_decompress);
        if (sctx->vs_blit_pos)
                sctx->b.delete_vs_state(&sctx->b, sctx->vs_blit_pos);
        if (sctx->vs_blit_pos_layered)
                sctx->b.delete_vs_state(&sctx->b, sctx->vs_blit_pos_layered);
        if (sctx->vs_blit_color)
                sctx->b.delete_vs_state(&sctx->b, sctx->vs_blit_color);
        if (sctx->vs_blit_color_layered)
                sctx->b.delete_vs_state(&sctx->b, sctx->vs_blit_color_layered);
        if (sctx->vs_blit_texcoord)
                sctx->b.delete_vs_state(&sctx->b, sctx->vs_blit_texcoord);
        if (sctx->cs_clear_buffer)
                sctx->b.delete_compute_state(&sctx->b, sctx->cs_clear_buffer);
        if (sctx->cs_copy_buffer)
                sctx->b.delete_compute_state(&sctx->b, sctx->cs_copy_buffer);

        if (sctx->blitter)
                util_blitter_destroy(sctx->blitter);

        /* Release DCC stats. */
        for (int i = 0; i < ARRAY_SIZE(sctx->dcc_stats); i++) {
                assert(!sctx->dcc_stats[i].query_active);

                for (int j = 0; j < ARRAY_SIZE(sctx->dcc_stats[i].ps_stats); j++)
                        if (sctx->dcc_stats[i].ps_stats[j])
                                sctx->b.destroy_query(&sctx->b,
                                                        sctx->dcc_stats[i].ps_stats[j]);

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

        if (sctx->query_result_shader)
                sctx->b.delete_compute_state(&sctx->b, sctx->query_result_shader);

        if (sctx->gfx_cs)
                sctx->ws->cs_destroy(sctx->gfx_cs);
        if (sctx->dma_cs)
                sctx->ws->cs_destroy(sctx->dma_cs);
        if (sctx->ctx)
                sctx->ws->ctx_destroy(sctx->ctx);

        if (sctx->b.stream_uploader)
                u_upload_destroy(sctx->b.stream_uploader);
        if (sctx->b.const_uploader)
                u_upload_destroy(sctx->b.const_uploader);
        if (sctx->cached_gtt_allocator)
                u_upload_destroy(sctx->cached_gtt_allocator);

        slab_destroy_child(&sctx->pool_transfers);
        slab_destroy_child(&sctx->pool_transfers_unsync);

        if (sctx->allocator_zeroed_memory)
                u_suballocator_destroy(sctx->allocator_zeroed_memory);

        sctx->ws->fence_reference(&sctx->last_gfx_fence, NULL);
        sctx->ws->fence_reference(&sctx->last_sdma_fence, NULL);
        r600_resource_reference(&sctx->eop_bug_scratch, NULL);

        si_destroy_compiler(&sctx->compiler);

        si_saved_cs_reference(&sctx->current_saved_cs, NULL);

        _mesa_hash_table_destroy(sctx->tex_handles, NULL);
        _mesa_hash_table_destroy(sctx->img_handles, NULL);

        util_dynarray_fini(&sctx->resident_tex_handles);
        util_dynarray_fini(&sctx->resident_img_handles);
        util_dynarray_fini(&sctx->resident_tex_needs_color_decompress);
        util_dynarray_fini(&sctx->resident_img_needs_color_decompress);
        util_dynarray_fini(&sctx->resident_tex_needs_depth_decompress);
        FREE(sctx);
}

static enum pipe_reset_status si_get_reset_status(struct pipe_context *ctx)
{
        struct si_context *sctx = (struct si_context *)ctx;

        if (sctx->screen->info.has_gpu_reset_status_query)
                return sctx->ws->ctx_query_reset_status(sctx->ctx);

        if (sctx->screen->info.has_gpu_reset_counter_query) {
                unsigned latest = sctx->ws->query_value(sctx->ws,
                                                        RADEON_GPU_RESET_COUNTER);

                if (sctx->gpu_reset_counter == latest)
                        return PIPE_NO_RESET;

                sctx->gpu_reset_counter = latest;
                return PIPE_UNKNOWN_CONTEXT_RESET;
        }

        return PIPE_NO_RESET;
}

static void si_set_device_reset_callback(struct pipe_context *ctx,
                                           const struct pipe_device_reset_callback *cb)
{
        struct si_context *sctx = (struct si_context *)ctx;

        if (cb)
                sctx->device_reset_callback = *cb;
        else
                memset(&sctx->device_reset_callback, 0,
                       sizeof(sctx->device_reset_callback));
}

bool si_check_device_reset(struct si_context *sctx)
{
        enum pipe_reset_status status;

        if (!sctx->device_reset_callback.reset)
                return false;

        if (!sctx->b.get_device_reset_status)
                return false;

        status = sctx->b.get_device_reset_status(&sctx->b);
        if (status == PIPE_NO_RESET)
                return false;

        sctx->device_reset_callback.reset(sctx->device_reset_callback.data, status);
        return true;
}

/* Apitrace profiling:
 *   1) qapitrace : Tools -> Profile: Measure CPU & GPU times
 *   2) In the middle panel, zoom in (mouse wheel) on some bad draw call
 *      and remember its number.
 *   3) In Mesa, enable queries and performance counters around that draw
 *      call and print the results.
 *   4) glretrace --benchmark --markers ..
 */
static void si_emit_string_marker(struct pipe_context *ctx,
                                  const char *string, int len)
{
        struct si_context *sctx = (struct si_context *)ctx;

        dd_parse_apitrace_marker(string, len, &sctx->apitrace_call_number);

        if (sctx->log)
                u_log_printf(sctx->log, "\nString marker: %*s\n", len, string);
}

static void si_set_debug_callback(struct pipe_context *ctx,
                                  const struct pipe_debug_callback *cb)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_screen *screen = sctx->screen;

        util_queue_finish(&screen->shader_compiler_queue);
        util_queue_finish(&screen->shader_compiler_queue_low_priority);

        if (cb)
                sctx->debug = *cb;
        else
                memset(&sctx->debug, 0, sizeof(sctx->debug));
}

static void si_set_log_context(struct pipe_context *ctx,
                               struct u_log_context *log)
{
        struct si_context *sctx = (struct si_context *)ctx;
        sctx->log = log;

        if (log)
                u_log_add_auto_logger(log, si_auto_log_cs, sctx);
}

static void si_set_context_param(struct pipe_context *ctx,
                                 enum pipe_context_param param,
                                 unsigned value)
{
        struct radeon_winsys *ws = ((struct si_context *)ctx)->ws;

        switch (param) {
        case PIPE_CONTEXT_PARAM_PIN_THREADS_TO_L3_CACHE:
                ws->pin_threads_to_L3_cache(ws, value);
                break;
        default:;
        }
}

static struct pipe_context *si_create_context(struct pipe_screen *screen,
                                              unsigned flags)
{
        struct si_context *sctx = CALLOC_STRUCT(si_context);
        struct si_screen* sscreen = (struct si_screen *)screen;
        struct radeon_winsys *ws = sscreen->ws;
        int shader, i;

        if (!sctx)
                return NULL;

        if (flags & PIPE_CONTEXT_DEBUG)
                sscreen->record_llvm_ir = true; /* racy but not critical */

        sctx->b.screen = screen; /* this must be set first */
        sctx->b.priv = NULL;
        sctx->b.destroy = si_destroy_context;
        sctx->b.emit_string_marker = si_emit_string_marker;
        sctx->b.set_debug_callback = si_set_debug_callback;
        sctx->b.set_log_context = si_set_log_context;
        sctx->b.set_context_param = si_set_context_param;
        sctx->screen = sscreen; /* Easy accessing of screen/winsys. */
        sctx->is_debug = (flags & PIPE_CONTEXT_DEBUG) != 0;

        slab_create_child(&sctx->pool_transfers, &sscreen->pool_transfers);
        slab_create_child(&sctx->pool_transfers_unsync, &sscreen->pool_transfers);

        sctx->ws = sscreen->ws;
        sctx->family = sscreen->info.family;
        sctx->chip_class = sscreen->info.chip_class;

        if (sscreen->info.has_gpu_reset_counter_query) {
                sctx->gpu_reset_counter =
                        sctx->ws->query_value(sctx->ws, RADEON_GPU_RESET_COUNTER);
        }

        sctx->b.get_device_reset_status = si_get_reset_status;
        sctx->b.set_device_reset_callback = si_set_device_reset_callback;

        si_init_context_texture_functions(sctx);
        si_init_query_functions(sctx);

        if (sctx->chip_class == CIK ||
            sctx->chip_class == VI ||
            sctx->chip_class == GFX9) {
                sctx->eop_bug_scratch = r600_resource(
                        pipe_buffer_create(&sscreen->b, 0, PIPE_USAGE_DEFAULT,
                                           16 * sscreen->info.num_render_backends));
                if (!sctx->eop_bug_scratch)
                        goto fail;
        }

        sctx->allocator_zeroed_memory =
                        u_suballocator_create(&sctx->b, sscreen->info.gart_page_size,
                                              0, PIPE_USAGE_DEFAULT,
                                              SI_RESOURCE_FLAG_SO_FILLED_SIZE, true);
        if (!sctx->allocator_zeroed_memory)
                goto fail;

        sctx->b.stream_uploader = u_upload_create(&sctx->b, 1024 * 1024,
                                                    0, PIPE_USAGE_STREAM,
                                                    SI_RESOURCE_FLAG_READ_ONLY);
        if (!sctx->b.stream_uploader)
                goto fail;

        sctx->b.const_uploader = u_upload_create(&sctx->b, 128 * 1024,
                                                   0, PIPE_USAGE_DEFAULT,
                                                   SI_RESOURCE_FLAG_32BIT |
                                                   (sscreen->cpdma_prefetch_writes_memory ?
                                                            0 : SI_RESOURCE_FLAG_READ_ONLY));
        if (!sctx->b.const_uploader)
                goto fail;

        sctx->cached_gtt_allocator = u_upload_create(&sctx->b, 16 * 1024,
                                                       0, PIPE_USAGE_STAGING, 0);
        if (!sctx->cached_gtt_allocator)
                goto fail;

        sctx->ctx = sctx->ws->ctx_create(sctx->ws);
        if (!sctx->ctx)
                goto fail;

        if (sscreen->info.num_sdma_rings && !(sscreen->debug_flags & DBG(NO_ASYNC_DMA))) {
                sctx->dma_cs = sctx->ws->cs_create(sctx->ctx, RING_DMA,
                                                       (void*)si_flush_dma_cs,
                                                       sctx);
        }

        si_init_buffer_functions(sctx);
        si_init_clear_functions(sctx);
        si_init_blit_functions(sctx);
        si_init_compute_functions(sctx);
        si_init_compute_blit_functions(sctx);
        si_init_debug_functions(sctx);
        si_init_msaa_functions(sctx);
        si_init_streamout_functions(sctx);

        if (sscreen->info.has_hw_decode) {
                sctx->b.create_video_codec = si_uvd_create_decoder;
                sctx->b.create_video_buffer = si_video_buffer_create;
        } else {
                sctx->b.create_video_codec = vl_create_decoder;
                sctx->b.create_video_buffer = vl_video_buffer_create;
        }

        sctx->gfx_cs = ws->cs_create(sctx->ctx, RING_GFX,
                                       (void*)si_flush_gfx_cs, sctx);

        /* Border colors. */
        sctx->border_color_table = malloc(SI_MAX_BORDER_COLORS *
                                          sizeof(*sctx->border_color_table));
        if (!sctx->border_color_table)
                goto fail;

        sctx->border_color_buffer = r600_resource(
                pipe_buffer_create(screen, 0, PIPE_USAGE_DEFAULT,
                                   SI_MAX_BORDER_COLORS *
                                   sizeof(*sctx->border_color_table)));
        if (!sctx->border_color_buffer)
                goto fail;

        sctx->border_color_map =
                ws->buffer_map(sctx->border_color_buffer->buf,
                               NULL, PIPE_TRANSFER_WRITE);
        if (!sctx->border_color_map)
                goto fail;

        si_init_all_descriptors(sctx);
        si_init_fence_functions(sctx);
        si_init_state_functions(sctx);
        si_init_shader_functions(sctx);
        si_init_viewport_functions(sctx);
        si_init_ia_multi_vgt_param_table(sctx);

        if (sctx->chip_class >= CIK)
                cik_init_sdma_functions(sctx);
        else
                si_init_dma_functions(sctx);

        if (sscreen->debug_flags & DBG(FORCE_DMA))
                sctx->b.resource_copy_region = sctx->dma_copy;

        bool dst_stream_policy = SI_COMPUTE_DST_CACHE_POLICY != L2_LRU;
        sctx->cs_clear_buffer = si_create_dma_compute_shader(&sctx->b,
                                             SI_COMPUTE_CLEAR_DW_PER_THREAD,
                                             dst_stream_policy, false);
        sctx->cs_copy_buffer = si_create_dma_compute_shader(&sctx->b,
                                             SI_COMPUTE_COPY_DW_PER_THREAD,
                                             dst_stream_policy, true);

        sctx->blitter = util_blitter_create(&sctx->b);
        if (sctx->blitter == NULL)
                goto fail;
        sctx->blitter->draw_rectangle = si_draw_rectangle;
        sctx->blitter->skip_viewport_restore = true;

        sctx->sample_mask = 0xffff;

        if (sctx->chip_class >= GFX9) {
                sctx->wait_mem_scratch = r600_resource(
                        pipe_buffer_create(screen, 0, PIPE_USAGE_DEFAULT, 4));
                if (!sctx->wait_mem_scratch)
                        goto fail;

                /* Initialize the memory. */
                struct radeon_cmdbuf *cs = sctx->gfx_cs;
                radeon_emit(cs, PKT3(PKT3_WRITE_DATA, 3, 0));
                radeon_emit(cs, S_370_DST_SEL(V_370_MEMORY_SYNC) |
                            S_370_WR_CONFIRM(1) |
                            S_370_ENGINE_SEL(V_370_ME));
                radeon_emit(cs, sctx->wait_mem_scratch->gpu_address);
                radeon_emit(cs, sctx->wait_mem_scratch->gpu_address >> 32);
                radeon_emit(cs, sctx->wait_mem_number);
                radeon_add_to_buffer_list(sctx, cs, sctx->wait_mem_scratch,
                                          RADEON_USAGE_WRITE, RADEON_PRIO_FENCE);
        }

        /* CIK cannot unbind a constant buffer (S_BUFFER_LOAD doesn't skip loads
         * if NUM_RECORDS == 0). We need to use a dummy buffer instead. */
        if (sctx->chip_class == CIK) {
                sctx->null_const_buf.buffer =
                        pipe_aligned_buffer_create(screen,
                                                   SI_RESOURCE_FLAG_32BIT,
                                                   PIPE_USAGE_DEFAULT, 16,
                                                   sctx->screen->info.tcc_cache_line_size);
                if (!sctx->null_const_buf.buffer)
                        goto fail;
                sctx->null_const_buf.buffer_size = sctx->null_const_buf.buffer->width0;

                for (shader = 0; shader < SI_NUM_SHADERS; shader++) {
                        for (i = 0; i < SI_NUM_CONST_BUFFERS; i++) {
                                sctx->b.set_constant_buffer(&sctx->b, shader, i,
                                                              &sctx->null_const_buf);
                        }
                }

                si_set_rw_buffer(sctx, SI_HS_CONST_DEFAULT_TESS_LEVELS,
                                 &sctx->null_const_buf);
                si_set_rw_buffer(sctx, SI_VS_CONST_INSTANCE_DIVISORS,
                                 &sctx->null_const_buf);
                si_set_rw_buffer(sctx, SI_VS_CONST_CLIP_PLANES,
                                 &sctx->null_const_buf);
                si_set_rw_buffer(sctx, SI_PS_CONST_POLY_STIPPLE,
                                 &sctx->null_const_buf);
                si_set_rw_buffer(sctx, SI_PS_CONST_SAMPLE_POSITIONS,
                                 &sctx->null_const_buf);
        }

        uint64_t max_threads_per_block;
        screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
                                  PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK,
                                  &max_threads_per_block);

        /* The maximum number of scratch waves. Scratch space isn't divided
         * evenly between CUs. The number is only a function of the number of CUs.
         * We can decrease the constant to decrease the scratch buffer size.
         *
         * sctx->scratch_waves must be >= the maximum posible size of
         * 1 threadgroup, so that the hw doesn't hang from being unable
         * to start any.
         *
         * The recommended value is 4 per CU at most. Higher numbers don't
         * bring much benefit, but they still occupy chip resources (think
         * async compute). I've seen ~2% performance difference between 4 and 32.
         */
        sctx->scratch_waves = MAX2(32 * sscreen->info.num_good_compute_units,
                                   max_threads_per_block / 64);

        si_init_compiler(sscreen, &sctx->compiler);

        /* Bindless handles. */
        sctx->tex_handles = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
                                                    _mesa_key_pointer_equal);
        sctx->img_handles = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
                                                    _mesa_key_pointer_equal);

        util_dynarray_init(&sctx->resident_tex_handles, NULL);
        util_dynarray_init(&sctx->resident_img_handles, NULL);
        util_dynarray_init(&sctx->resident_tex_needs_color_decompress, NULL);
        util_dynarray_init(&sctx->resident_img_needs_color_decompress, NULL);
        util_dynarray_init(&sctx->resident_tex_needs_depth_decompress, NULL);

        sctx->sample_pos_buffer =
                pipe_buffer_create(sctx->b.screen, 0, PIPE_USAGE_DEFAULT,
                                   sizeof(sctx->sample_positions));
        pipe_buffer_write(&sctx->b, sctx->sample_pos_buffer, 0,
                          sizeof(sctx->sample_positions), &sctx->sample_positions);

        /* this must be last */
        si_begin_new_gfx_cs(sctx);

        if (sctx->chip_class == CIK) {
                /* Clear the NULL constant buffer, because loads should return zeros. */
                uint32_t clear_value = 0;
                si_clear_buffer(sctx, sctx->null_const_buf.buffer, 0,
                                sctx->null_const_buf.buffer->width0,
                                &clear_value, 4, SI_COHERENCY_SHADER);
        }
        return &sctx->b;
fail:
        fprintf(stderr, "radeonsi: Failed to create a context.\n");
        si_destroy_context(&sctx->b);
        return NULL;
}

static struct pipe_context *si_pipe_create_context(struct pipe_screen *screen,
                                                   void *priv, unsigned flags)
{
        struct si_screen *sscreen = (struct si_screen *)screen;
        struct pipe_context *ctx;

        if (sscreen->debug_flags & DBG(CHECK_VM))
                flags |= PIPE_CONTEXT_DEBUG;

        ctx = si_create_context(screen, flags);

        if (!(flags & PIPE_CONTEXT_PREFER_THREADED))
                return ctx;

        /* Clover (compute-only) is unsupported. */
        if (flags & PIPE_CONTEXT_COMPUTE_ONLY)
                return ctx;

        /* When shaders are logged to stderr, asynchronous compilation is
         * disabled too. */
        if (sscreen->debug_flags & DBG_ALL_SHADERS)
                return ctx;

        /* Use asynchronous flushes only on amdgpu, since the radeon
         * implementation for fence_server_sync is incomplete. */
        return threaded_context_create(ctx, &sscreen->pool_transfers,
                                       si_replace_buffer_storage,
                                       sscreen->info.drm_major >= 3 ? si_create_fence : NULL,
                                       &((struct si_context*)ctx)->tc);
}

/*
 * pipe_screen
 */
static void si_destroy_screen(struct pipe_screen* pscreen)
{
        struct si_screen *sscreen = (struct si_screen *)pscreen;
        struct si_shader_part *parts[] = {
                sscreen->vs_prologs,
                sscreen->tcs_epilogs,
                sscreen->gs_prologs,
                sscreen->ps_prologs,
                sscreen->ps_epilogs
        };
        unsigned i;

        if (!sscreen->ws->unref(sscreen->ws))
                return;

        util_queue_destroy(&sscreen->shader_compiler_queue);
        util_queue_destroy(&sscreen->shader_compiler_queue_low_priority);

        for (i = 0; i < ARRAY_SIZE(sscreen->compiler); i++)
                si_destroy_compiler(&sscreen->compiler[i]);

        for (i = 0; i < ARRAY_SIZE(sscreen->compiler_lowp); i++)
                si_destroy_compiler(&sscreen->compiler_lowp[i]);

        /* Free shader parts. */
        for (i = 0; i < ARRAY_SIZE(parts); i++) {
                while (parts[i]) {
                        struct si_shader_part *part = parts[i];

                        parts[i] = part->next;
                        ac_shader_binary_clean(&part->binary);
                        FREE(part);
                }
        }
        mtx_destroy(&sscreen->shader_parts_mutex);
        si_destroy_shader_cache(sscreen);

        si_perfcounters_destroy(sscreen);
        si_gpu_load_kill_thread(sscreen);

        mtx_destroy(&sscreen->gpu_load_mutex);
        mtx_destroy(&sscreen->aux_context_lock);
        sscreen->aux_context->destroy(sscreen->aux_context);

        slab_destroy_parent(&sscreen->pool_transfers);

        disk_cache_destroy(sscreen->disk_shader_cache);
        sscreen->ws->destroy(sscreen->ws);
        FREE(sscreen);
}

static void si_init_gs_info(struct si_screen *sscreen)
{
        sscreen->gs_table_depth = ac_get_gs_table_depth(sscreen->info.chip_class,
                                                        sscreen->info.family);
}

static void si_handle_env_var_force_family(struct si_screen *sscreen)
{
        const char *family = debug_get_option("SI_FORCE_FAMILY", NULL);
        unsigned i;

        if (!family)
                return;

        for (i = CHIP_TAHITI; i < CHIP_LAST; i++) {
                if (!strcmp(family, ac_get_llvm_processor_name(i))) {
                        /* Override family and chip_class. */
                        sscreen->info.family = i;
                        sscreen->info.name = "GCN-NOOP";

                        if (i >= CHIP_VEGA10)
                                sscreen->info.chip_class = GFX9;
                        else if (i >= CHIP_TONGA)
                                sscreen->info.chip_class = VI;
                        else if (i >= CHIP_BONAIRE)
                                sscreen->info.chip_class = CIK;
                        else
                                sscreen->info.chip_class = SI;

                        /* Don't submit any IBs. */
                        setenv("RADEON_NOOP", "1", 1);
                        return;
                }
        }

        fprintf(stderr, "radeonsi: Unknown family: %s\n", family);
        exit(1);
}

static void si_test_vmfault(struct si_screen *sscreen)
{
        struct pipe_context *ctx = sscreen->aux_context;
        struct si_context *sctx = (struct si_context *)ctx;
        struct pipe_resource *buf =
                pipe_buffer_create_const0(&sscreen->b, 0, PIPE_USAGE_DEFAULT, 64);

        if (!buf) {
                puts("Buffer allocation failed.");
                exit(1);
        }

        r600_resource(buf)->gpu_address = 0; /* cause a VM fault */

        if (sscreen->debug_flags & DBG(TEST_VMFAULT_CP)) {
                si_cp_dma_copy_buffer(sctx, buf, buf, 0, 4, 4, 0,
                                      SI_COHERENCY_NONE, L2_BYPASS);
                ctx->flush(ctx, NULL, 0);
                puts("VM fault test: CP - done.");
        }
        if (sscreen->debug_flags & DBG(TEST_VMFAULT_SDMA)) {
                si_sdma_clear_buffer(sctx, buf, 0, 4, 0);
                ctx->flush(ctx, NULL, 0);
                puts("VM fault test: SDMA - done.");
        }
        if (sscreen->debug_flags & DBG(TEST_VMFAULT_SHADER)) {
                util_test_constant_buffer(ctx, buf);
                puts("VM fault test: Shader - done.");
        }
        exit(0);
}

static void si_disk_cache_create(struct si_screen *sscreen)
{
        /* Don't use the cache if shader dumping is enabled. */
        if (sscreen->debug_flags & DBG_ALL_SHADERS)
                return;

        struct mesa_sha1 ctx;
        unsigned char sha1[20];
        char cache_id[20 * 2 + 1];

        _mesa_sha1_init(&ctx);

        if (!disk_cache_get_function_identifier(si_disk_cache_create, &ctx) ||
            !disk_cache_get_function_identifier(LLVMInitializeAMDGPUTargetInfo,
                                                &ctx))
                return;

        _mesa_sha1_final(&ctx, sha1);
        disk_cache_format_hex_id(cache_id, sha1, 20 * 2);

        /* These flags affect shader compilation. */
        #define ALL_FLAGS (DBG(FS_CORRECT_DERIVS_AFTER_KILL) |  \
                           DBG(SI_SCHED) |                      \
                           DBG(GISEL) |                         \
                           DBG(UNSAFE_MATH) |                   \
                           DBG(NIR))
        uint64_t shader_debug_flags = sscreen->debug_flags &
                ALL_FLAGS;

        /* Add the high bits of 32-bit addresses, which affects
         * how 32-bit addresses are expanded to 64 bits.
         */
        STATIC_ASSERT(ALL_FLAGS <= UINT_MAX);
        shader_debug_flags |= (uint64_t)sscreen->info.address32_hi << 32;

        sscreen->disk_shader_cache =
                disk_cache_create(sscreen->info.name,
                                  cache_id,
                                  shader_debug_flags);
}

struct pipe_screen *radeonsi_screen_create(struct radeon_winsys *ws,
                                           const struct pipe_screen_config *config)
{
        struct si_screen *sscreen = CALLOC_STRUCT(si_screen);
        unsigned hw_threads, num_comp_hi_threads, num_comp_lo_threads, i;

        if (!sscreen) {
                return NULL;
        }

        sscreen->ws = ws;
        ws->query_info(ws, &sscreen->info);
        si_handle_env_var_force_family(sscreen);

        if (sscreen->info.chip_class >= GFX9) {
                sscreen->se_tile_repeat = 32 * sscreen->info.max_se;
        } else {
                ac_get_raster_config(&sscreen->info,
                                     &sscreen->pa_sc_raster_config,
                                     &sscreen->pa_sc_raster_config_1,
                                     &sscreen->se_tile_repeat);
        }

        sscreen->debug_flags = debug_get_flags_option("R600_DEBUG",
                                                        debug_options, 0);

        /* Set functions first. */
        sscreen->b.context_create = si_pipe_create_context;
        sscreen->b.destroy = si_destroy_screen;

        si_init_screen_get_functions(sscreen);
        si_init_screen_buffer_functions(sscreen);
        si_init_screen_fence_functions(sscreen);
        si_init_screen_state_functions(sscreen);
        si_init_screen_texture_functions(sscreen);
        si_init_screen_query_functions(sscreen);

        /* Set these flags in debug_flags early, so that the shader cache takes
         * them into account.
         */
        if (driQueryOptionb(config->options,
                            "glsl_correct_derivatives_after_discard"))
                sscreen->debug_flags |= DBG(FS_CORRECT_DERIVS_AFTER_KILL);
        if (driQueryOptionb(config->options, "radeonsi_enable_sisched"))
                sscreen->debug_flags |= DBG(SI_SCHED);


        if (sscreen->debug_flags & DBG(INFO))
                ac_print_gpu_info(&sscreen->info);

        slab_create_parent(&sscreen->pool_transfers,
                           sizeof(struct si_transfer), 64);

        sscreen->force_aniso = MIN2(16, debug_get_num_option("R600_TEX_ANISO", -1));
        if (sscreen->force_aniso >= 0) {
                printf("radeonsi: Forcing anisotropy filter to %ix\n",
                       /* round down to a power of two */
                       1 << util_logbase2(sscreen->force_aniso));
        }

        (void) mtx_init(&sscreen->aux_context_lock, mtx_plain);
        (void) mtx_init(&sscreen->gpu_load_mutex, mtx_plain);

        si_init_gs_info(sscreen);
        if (!si_init_shader_cache(sscreen)) {
                FREE(sscreen);
                return NULL;
        }

        si_disk_cache_create(sscreen);

        /* Determine the number of shader compiler threads. */
        hw_threads = sysconf(_SC_NPROCESSORS_ONLN);

        if (hw_threads >= 12) {
                num_comp_hi_threads = hw_threads * 3 / 4;
                num_comp_lo_threads = hw_threads / 3;
        } else if (hw_threads >= 6) {
                num_comp_hi_threads = hw_threads - 2;
                num_comp_lo_threads = hw_threads / 2;
        } else if (hw_threads >= 2) {
                num_comp_hi_threads = hw_threads - 1;
                num_comp_lo_threads = hw_threads / 2;
        } else {
                num_comp_hi_threads = 1;
                num_comp_lo_threads = 1;
        }

        num_comp_hi_threads = MIN2(num_comp_hi_threads,
                                   ARRAY_SIZE(sscreen->compiler));
        num_comp_lo_threads = MIN2(num_comp_lo_threads,
                                   ARRAY_SIZE(sscreen->compiler_lowp));

        if (!util_queue_init(&sscreen->shader_compiler_queue, "sh",
                             64, num_comp_hi_threads,
                             UTIL_QUEUE_INIT_RESIZE_IF_FULL |
                             UTIL_QUEUE_INIT_SET_FULL_THREAD_AFFINITY)) {
                si_destroy_shader_cache(sscreen);
                FREE(sscreen);
                return NULL;
        }

        if (!util_queue_init(&sscreen->shader_compiler_queue_low_priority,
                             "shlo",
                             64, num_comp_lo_threads,
                             UTIL_QUEUE_INIT_RESIZE_IF_FULL |
                             UTIL_QUEUE_INIT_SET_FULL_THREAD_AFFINITY |
                             UTIL_QUEUE_INIT_USE_MINIMUM_PRIORITY)) {
               si_destroy_shader_cache(sscreen);
               FREE(sscreen);
               return NULL;
        }

        if (!debug_get_bool_option("RADEON_DISABLE_PERFCOUNTERS", false))
                si_init_perfcounters(sscreen);

        /* Determine tessellation ring info. */
        bool double_offchip_buffers = sscreen->info.chip_class >= CIK &&
                                      sscreen->info.family != CHIP_CARRIZO &&
                                      sscreen->info.family != CHIP_STONEY;
        /* This must be one less than the maximum number due to a hw limitation.
         * Various hardware bugs in SI, CIK, and GFX9 need this.
         */
        unsigned max_offchip_buffers_per_se;

        /* Only certain chips can use the maximum value. */
        if (sscreen->info.family == CHIP_VEGA12 ||
            sscreen->info.family == CHIP_VEGA20)
                max_offchip_buffers_per_se = double_offchip_buffers ? 128 : 64;
        else
                max_offchip_buffers_per_se = double_offchip_buffers ? 127 : 63;

        unsigned max_offchip_buffers = max_offchip_buffers_per_se *
                                       sscreen->info.max_se;
        unsigned offchip_granularity;

        /* Hawaii has a bug with offchip buffers > 256 that can be worked
         * around by setting 4K granularity.
         */
        if (sscreen->info.family == CHIP_HAWAII) {
                sscreen->tess_offchip_block_dw_size = 4096;
                offchip_granularity = V_03093C_X_4K_DWORDS;
        } else {
                sscreen->tess_offchip_block_dw_size = 8192;
                offchip_granularity = V_03093C_X_8K_DWORDS;
        }

        sscreen->tess_factor_ring_size = 32768 * sscreen->info.max_se;
        assert(((sscreen->tess_factor_ring_size / 4) & C_030938_SIZE) == 0);
        sscreen->tess_offchip_ring_size = max_offchip_buffers *
                                          sscreen->tess_offchip_block_dw_size * 4;

        if (sscreen->info.chip_class >= CIK) {
                if (sscreen->info.chip_class >= VI)
                        --max_offchip_buffers;
                sscreen->vgt_hs_offchip_param =
                        S_03093C_OFFCHIP_BUFFERING(max_offchip_buffers) |
                        S_03093C_OFFCHIP_GRANULARITY(offchip_granularity);
        } else {
                assert(offchip_granularity == V_03093C_X_8K_DWORDS);
                sscreen->vgt_hs_offchip_param =
                        S_0089B0_OFFCHIP_BUFFERING(max_offchip_buffers);
        }

        /* The mere presense of CLEAR_STATE in the IB causes random GPU hangs
        * on SI. Some CLEAR_STATE cause asic hang on radeon kernel, etc.
        * SPI_VS_OUT_CONFIG. So only enable CI CLEAR_STATE on amdgpu kernel.*/
       sscreen->has_clear_state = sscreen->info.chip_class >= CIK &&
                                  sscreen->info.drm_major == 3;

        sscreen->has_distributed_tess =
                sscreen->info.chip_class >= VI &&
                sscreen->info.max_se >= 2;

        sscreen->has_draw_indirect_multi =
                (sscreen->info.family >= CHIP_POLARIS10) ||
                (sscreen->info.chip_class == VI &&
                 sscreen->info.pfp_fw_version >= 121 &&
                 sscreen->info.me_fw_version >= 87) ||
                (sscreen->info.chip_class == CIK &&
                 sscreen->info.pfp_fw_version >= 211 &&
                 sscreen->info.me_fw_version >= 173) ||
                (sscreen->info.chip_class == SI &&
                 sscreen->info.pfp_fw_version >= 79 &&
                 sscreen->info.me_fw_version >= 142);

        sscreen->has_out_of_order_rast = sscreen->info.chip_class >= VI &&
                                         sscreen->info.max_se >= 2 &&
                                         !(sscreen->debug_flags & DBG(NO_OUT_OF_ORDER));
        sscreen->assume_no_z_fights =
                driQueryOptionb(config->options, "radeonsi_assume_no_z_fights");
        sscreen->commutative_blend_add =
                driQueryOptionb(config->options, "radeonsi_commutative_blend_add");
        sscreen->clear_db_cache_before_clear =
                driQueryOptionb(config->options, "radeonsi_clear_db_cache_before_clear");
        sscreen->has_msaa_sample_loc_bug = (sscreen->info.family >= CHIP_POLARIS10 &&
                                            sscreen->info.family <= CHIP_POLARIS12) ||
                                           sscreen->info.family == CHIP_VEGA10 ||
                                           sscreen->info.family == CHIP_RAVEN;
        sscreen->has_ls_vgpr_init_bug = sscreen->info.family == CHIP_VEGA10 ||
                                        sscreen->info.family == CHIP_RAVEN;

        if (sscreen->debug_flags & DBG(DPBB)) {
                sscreen->dpbb_allowed = true;
        } else {
                /* Only enable primitive binning on Raven by default. */
                /* TODO: Investigate if binning is profitable on Vega12. */
                sscreen->dpbb_allowed = sscreen->info.family == CHIP_RAVEN &&
                                        !(sscreen->debug_flags & DBG(NO_DPBB));
        }

        if (sscreen->debug_flags & DBG(DFSM)) {
                sscreen->dfsm_allowed = sscreen->dpbb_allowed;
        } else {
                sscreen->dfsm_allowed = sscreen->dpbb_allowed &&
                                        !(sscreen->debug_flags & DBG(NO_DFSM));
        }

        /* While it would be nice not to have this flag, we are constrained
         * by the reality that LLVM 5.0 doesn't have working VGPR indexing
         * on GFX9.
         */
        sscreen->llvm_has_working_vgpr_indexing = sscreen->info.chip_class <= VI;

        /* Some chips have RB+ registers, but don't support RB+. Those must
         * always disable it.
         */
        if (sscreen->info.family == CHIP_STONEY ||
            sscreen->info.chip_class >= GFX9) {
                sscreen->has_rbplus = true;

                sscreen->rbplus_allowed =
                        !(sscreen->debug_flags & DBG(NO_RB_PLUS)) &&
                        (sscreen->info.family == CHIP_STONEY ||
                         sscreen->info.family == CHIP_VEGA12 ||
                         sscreen->info.family == CHIP_RAVEN);
        }

        sscreen->dcc_msaa_allowed =
                !(sscreen->debug_flags & DBG(NO_DCC_MSAA));

        sscreen->cpdma_prefetch_writes_memory = sscreen->info.chip_class <= VI;

        (void) mtx_init(&sscreen->shader_parts_mutex, mtx_plain);
        sscreen->use_monolithic_shaders =
                (sscreen->debug_flags & DBG(MONOLITHIC_SHADERS)) != 0;

        sscreen->barrier_flags.cp_to_L2 = SI_CONTEXT_INV_SMEM_L1 |
                                            SI_CONTEXT_INV_VMEM_L1;
        if (sscreen->info.chip_class <= VI) {
                sscreen->barrier_flags.cp_to_L2 |= SI_CONTEXT_INV_GLOBAL_L2;
                sscreen->barrier_flags.L2_to_cp |= SI_CONTEXT_WRITEBACK_GLOBAL_L2;
        }

        if (debug_get_bool_option("RADEON_DUMP_SHADERS", false))
                sscreen->debug_flags |= DBG_ALL_SHADERS;

        /* Syntax:
         *     EQAA=s,z,c
         * Example:
         *     EQAA=8,4,2

         * That means 8 coverage samples, 4 Z/S samples, and 2 color samples.
         * Constraints:
         *     s >= z >= c (ignoring this only wastes memory)
         *     s = [2..16]
         *     z = [2..8]
         *     c = [2..8]
         *
         * Only MSAA color and depth buffers are overriden.
         */
        if (sscreen->info.has_eqaa_surface_allocator) {
                const char *eqaa = debug_get_option("EQAA", NULL);
                unsigned s,z,f;

                if (eqaa && sscanf(eqaa, "%u,%u,%u", &s, &z, &f) == 3 && s && z && f) {
                        sscreen->eqaa_force_coverage_samples = s;
                        sscreen->eqaa_force_z_samples = z;
                        sscreen->eqaa_force_color_samples = f;
                }
        }

        for (i = 0; i < num_comp_hi_threads; i++)
                si_init_compiler(sscreen, &sscreen->compiler[i]);
        for (i = 0; i < num_comp_lo_threads; i++)
                si_init_compiler(sscreen, &sscreen->compiler_lowp[i]);

        /* Create the auxiliary context. This must be done last. */
        sscreen->aux_context = si_create_context(&sscreen->b, 0);

        if (sscreen->debug_flags & DBG(TEST_DMA))
                si_test_dma(sscreen);

        if (sscreen->debug_flags & DBG(TEST_DMA_PERF)) {
                si_test_dma_perf(sscreen);
        }

        if (sscreen->debug_flags & (DBG(TEST_VMFAULT_CP) |
                                      DBG(TEST_VMFAULT_SDMA) |
                                      DBG(TEST_VMFAULT_SHADER)))
                si_test_vmfault(sscreen);

        if (sscreen->debug_flags & DBG(TEST_GDS))
                si_test_gds((struct si_context*)sscreen->aux_context);

        return &sscreen->b;
}