radeonsi: enable distributed tess on multi-SE parts only

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

/*
 * Copyright 2012 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * 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:
 *      Christian König <christian.koenig@amd.com>
 *      Marek Olšák <maraeo@gmail.com>
 */

#include "si_pipe.h"
#include "si_shader.h"
#include "sid.h"
#include "radeon/r600_cs.h"

#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_ureg.h"
#include "util/hash_table.h"
#include "util/u_hash.h"
#include "util/u_memory.h"
#include "util/u_prim.h"
#include "util/u_simple_shaders.h"

/* SHADER_CACHE */

/**
 * Return the TGSI binary in a buffer. The first 4 bytes contain its size as
 * integer.
 */
static void *si_get_tgsi_binary(struct si_shader_selector *sel)
{
        unsigned tgsi_size = tgsi_num_tokens(sel->tokens) *
                             sizeof(struct tgsi_token);
        unsigned size = 4 + tgsi_size + sizeof(sel->so);
        char *result = (char*)MALLOC(size);

        if (!result)
                return NULL;

        *((uint32_t*)result) = size;
        memcpy(result + 4, sel->tokens, tgsi_size);
        memcpy(result + 4 + tgsi_size, &sel->so, sizeof(sel->so));
        return result;
}

/** Copy "data" to "ptr" and return the next dword following copied data. */
static uint32_t *write_data(uint32_t *ptr, const void *data, unsigned size)
{
        /* data may be NULL if size == 0 */
        if (size)
                memcpy(ptr, data, size);
        ptr += DIV_ROUND_UP(size, 4);
        return ptr;
}

/** Read data from "ptr". Return the next dword following the data. */
static uint32_t *read_data(uint32_t *ptr, void *data, unsigned size)
{
        memcpy(data, ptr, size);
        ptr += DIV_ROUND_UP(size, 4);
        return ptr;
}

/**
 * Write the size as uint followed by the data. Return the next dword
 * following the copied data.
 */
static uint32_t *write_chunk(uint32_t *ptr, const void *data, unsigned size)
{
        *ptr++ = size;
        return write_data(ptr, data, size);
}

/**
 * Read the size as uint followed by the data. Return both via parameters.
 * Return the next dword following the data.
 */
static uint32_t *read_chunk(uint32_t *ptr, void **data, unsigned *size)
{
        *size = *ptr++;
        assert(*data == NULL);
        *data = malloc(*size);
        return read_data(ptr, *data, *size);
}

/**
 * Return the shader binary in a buffer. The first 4 bytes contain its size
 * as integer.
 */
static void *si_get_shader_binary(struct si_shader *shader)
{
        /* There is always a size of data followed by the data itself. */
        unsigned relocs_size = shader->binary.reloc_count *
                               sizeof(shader->binary.relocs[0]);
        unsigned disasm_size = strlen(shader->binary.disasm_string) + 1;
        unsigned size =
                4 + /* total size */
                4 + /* CRC32 of the data below */
                align(sizeof(shader->config), 4) +
                align(sizeof(shader->info), 4) +
                4 + align(shader->binary.code_size, 4) +
                4 + align(shader->binary.rodata_size, 4) +
                4 + align(relocs_size, 4) +
                4 + align(disasm_size, 4);
        void *buffer = CALLOC(1, size);
        uint32_t *ptr = (uint32_t*)buffer;

        if (!buffer)
                return NULL;

        *ptr++ = size;
        ptr++; /* CRC32 is calculated at the end. */

        ptr = write_data(ptr, &shader->config, sizeof(shader->config));
        ptr = write_data(ptr, &shader->info, sizeof(shader->info));
        ptr = write_chunk(ptr, shader->binary.code, shader->binary.code_size);
        ptr = write_chunk(ptr, shader->binary.rodata, shader->binary.rodata_size);
        ptr = write_chunk(ptr, shader->binary.relocs, relocs_size);
        ptr = write_chunk(ptr, shader->binary.disasm_string, disasm_size);
        assert((char *)ptr - (char *)buffer == size);

        /* Compute CRC32. */
        ptr = (uint32_t*)buffer;
        ptr++;
        *ptr = util_hash_crc32(ptr + 1, size - 8);

        return buffer;
}

static bool si_load_shader_binary(struct si_shader *shader, void *binary)
{
        uint32_t *ptr = (uint32_t*)binary;
        uint32_t size = *ptr++;
        uint32_t crc32 = *ptr++;
        unsigned chunk_size;

        if (util_hash_crc32(ptr, size - 8) != crc32) {
                fprintf(stderr, "radeonsi: binary shader has invalid CRC32\n");
                return false;
        }

        ptr = read_data(ptr, &shader->config, sizeof(shader->config));
        ptr = read_data(ptr, &shader->info, sizeof(shader->info));
        ptr = read_chunk(ptr, (void**)&shader->binary.code,
                         &shader->binary.code_size);
        ptr = read_chunk(ptr, (void**)&shader->binary.rodata,
                         &shader->binary.rodata_size);
        ptr = read_chunk(ptr, (void**)&shader->binary.relocs, &chunk_size);
        shader->binary.reloc_count = chunk_size / sizeof(shader->binary.relocs[0]);
        ptr = read_chunk(ptr, (void**)&shader->binary.disasm_string, &chunk_size);

        return true;
}

/**
 * Insert a shader into the cache. It's assumed the shader is not in the cache.
 * Use si_shader_cache_load_shader before calling this.
 *
 * Returns false on failure, in which case the tgsi_binary should be freed.
 */
static bool si_shader_cache_insert_shader(struct si_screen *sscreen,
                                          void *tgsi_binary,
                                          struct si_shader *shader)
{
        void *hw_binary = si_get_shader_binary(shader);

        if (!hw_binary)
                return false;

        if (_mesa_hash_table_insert(sscreen->shader_cache, tgsi_binary,
                                    hw_binary) == NULL) {
                FREE(hw_binary);
                return false;
        }

        return true;
}

static bool si_shader_cache_load_shader(struct si_screen *sscreen,
                                        void *tgsi_binary,
                                        struct si_shader *shader)
{
        struct hash_entry *entry =
                _mesa_hash_table_search(sscreen->shader_cache, tgsi_binary);
        if (!entry)
                return false;

        return si_load_shader_binary(shader, entry->data);
}

static uint32_t si_shader_cache_key_hash(const void *key)
{
        /* The first dword is the key size. */
        return util_hash_crc32(key, *(uint32_t*)key);
}

static bool si_shader_cache_key_equals(const void *a, const void *b)
{
        uint32_t *keya = (uint32_t*)a;
        uint32_t *keyb = (uint32_t*)b;

        /* The first dword is the key size. */
        if (*keya != *keyb)
                return false;

        return memcmp(keya, keyb, *keya) == 0;
}

static void si_destroy_shader_cache_entry(struct hash_entry *entry)
{
        FREE((void*)entry->key);
        FREE(entry->data);
}

bool si_init_shader_cache(struct si_screen *sscreen)
{
        pipe_mutex_init(sscreen->shader_cache_mutex);
        sscreen->shader_cache =
                _mesa_hash_table_create(NULL,
                                        si_shader_cache_key_hash,
                                        si_shader_cache_key_equals);
        return sscreen->shader_cache != NULL;
}

void si_destroy_shader_cache(struct si_screen *sscreen)
{
        if (sscreen->shader_cache)
                _mesa_hash_table_destroy(sscreen->shader_cache,
                                         si_destroy_shader_cache_entry);
        pipe_mutex_destroy(sscreen->shader_cache_mutex);
}

/* SHADER STATES */

static void si_set_tesseval_regs(struct si_screen *sscreen,
                                 struct si_shader *shader,
                                 struct si_pm4_state *pm4)
{
        struct tgsi_shader_info *info = &shader->selector->info;
        unsigned tes_prim_mode = info->properties[TGSI_PROPERTY_TES_PRIM_MODE];
        unsigned tes_spacing = info->properties[TGSI_PROPERTY_TES_SPACING];
        bool tes_vertex_order_cw = info->properties[TGSI_PROPERTY_TES_VERTEX_ORDER_CW];
        bool tes_point_mode = info->properties[TGSI_PROPERTY_TES_POINT_MODE];
        unsigned type, partitioning, topology, distribution_mode;

        switch (tes_prim_mode) {
        case PIPE_PRIM_LINES:
                type = V_028B6C_TESS_ISOLINE;
                break;
        case PIPE_PRIM_TRIANGLES:
                type = V_028B6C_TESS_TRIANGLE;
                break;
        case PIPE_PRIM_QUADS:
                type = V_028B6C_TESS_QUAD;
                break;
        default:
                assert(0);
                return;
        }

        switch (tes_spacing) {
        case PIPE_TESS_SPACING_FRACTIONAL_ODD:
                partitioning = V_028B6C_PART_FRAC_ODD;
                break;
        case PIPE_TESS_SPACING_FRACTIONAL_EVEN:
                partitioning = V_028B6C_PART_FRAC_EVEN;
                break;
        case PIPE_TESS_SPACING_EQUAL:
                partitioning = V_028B6C_PART_INTEGER;
                break;
        default:
                assert(0);
                return;
        }

        if (tes_point_mode)
                topology = V_028B6C_OUTPUT_POINT;
        else if (tes_prim_mode == PIPE_PRIM_LINES)
                topology = V_028B6C_OUTPUT_LINE;
        else if (tes_vertex_order_cw)
                /* for some reason, this must be the other way around */
                topology = V_028B6C_OUTPUT_TRIANGLE_CCW;
        else
                topology = V_028B6C_OUTPUT_TRIANGLE_CW;

        if (sscreen->has_distributed_tess) {
                if (sscreen->b.family == CHIP_FIJI ||
                    sscreen->b.family >= CHIP_POLARIS10)
                        distribution_mode = V_028B6C_DISTRIBUTION_MODE_TRAPEZOIDS;
                else
                        distribution_mode = V_028B6C_DISTRIBUTION_MODE_DONUTS;
        } else
                distribution_mode = V_028B6C_DISTRIBUTION_MODE_NO_DIST;

        si_pm4_set_reg(pm4, R_028B6C_VGT_TF_PARAM,
                       S_028B6C_TYPE(type) |
                       S_028B6C_PARTITIONING(partitioning) |
                       S_028B6C_TOPOLOGY(topology) |
                       S_028B6C_DISTRIBUTION_MODE(distribution_mode));
}

static void si_shader_ls(struct si_shader *shader)
{
        struct si_pm4_state *pm4;
        unsigned vgpr_comp_cnt;
        uint64_t va;

        pm4 = shader->pm4 = CALLOC_STRUCT(si_pm4_state);
        if (!pm4)
                return;

        va = shader->bo->gpu_address;
        si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_USER_SHADER);

        /* We need at least 2 components for LS.
         * VGPR0-3: (VertexID, RelAutoindex, ???, InstanceID). */
        vgpr_comp_cnt = shader->info.uses_instanceid ? 3 : 1;

        si_pm4_set_reg(pm4, R_00B520_SPI_SHADER_PGM_LO_LS, va >> 8);
        si_pm4_set_reg(pm4, R_00B524_SPI_SHADER_PGM_HI_LS, va >> 40);

        shader->config.rsrc1 = S_00B528_VGPRS((shader->config.num_vgprs - 1) / 4) |
                           S_00B528_SGPRS((shader->config.num_sgprs - 1) / 8) |
                           S_00B528_VGPR_COMP_CNT(vgpr_comp_cnt) |
                           S_00B528_DX10_CLAMP(1) |
                           S_00B528_FLOAT_MODE(shader->config.float_mode);
        shader->config.rsrc2 = S_00B52C_USER_SGPR(SI_LS_NUM_USER_SGPR) |
                           S_00B52C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0);
}

static void si_shader_hs(struct si_shader *shader)
{
        struct si_pm4_state *pm4;
        uint64_t va;

        pm4 = shader->pm4 = CALLOC_STRUCT(si_pm4_state);
        if (!pm4)
                return;

        va = shader->bo->gpu_address;
        si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_USER_SHADER);

        si_pm4_set_reg(pm4, R_00B420_SPI_SHADER_PGM_LO_HS, va >> 8);
        si_pm4_set_reg(pm4, R_00B424_SPI_SHADER_PGM_HI_HS, va >> 40);
        si_pm4_set_reg(pm4, R_00B428_SPI_SHADER_PGM_RSRC1_HS,
                       S_00B428_VGPRS((shader->config.num_vgprs - 1) / 4) |
                       S_00B428_SGPRS((shader->config.num_sgprs - 1) / 8) |
                       S_00B428_DX10_CLAMP(1) |
                       S_00B428_FLOAT_MODE(shader->config.float_mode));
        si_pm4_set_reg(pm4, R_00B42C_SPI_SHADER_PGM_RSRC2_HS,
                       S_00B42C_USER_SGPR(SI_TCS_NUM_USER_SGPR) |
                       S_00B42C_OC_LDS_EN(1) |
                       S_00B42C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0));
}

static void si_shader_es(struct si_screen *sscreen, struct si_shader *shader)
{
        struct si_pm4_state *pm4;
        unsigned num_user_sgprs;
        unsigned vgpr_comp_cnt;
        uint64_t va;
        unsigned oc_lds_en;

        pm4 = shader->pm4 = CALLOC_STRUCT(si_pm4_state);

        if (!pm4)
                return;

        va = shader->bo->gpu_address;
        si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_USER_SHADER);

        if (shader->selector->type == PIPE_SHADER_VERTEX) {
                vgpr_comp_cnt = shader->info.uses_instanceid ? 3 : 0;
                num_user_sgprs = SI_ES_NUM_USER_SGPR;
        } else if (shader->selector->type == PIPE_SHADER_TESS_EVAL) {
                vgpr_comp_cnt = 3; /* all components are needed for TES */
                num_user_sgprs = SI_TES_NUM_USER_SGPR;
        } else
                unreachable("invalid shader selector type");

        oc_lds_en = shader->selector->type == PIPE_SHADER_TESS_EVAL ? 1 : 0;

        si_pm4_set_reg(pm4, R_028AAC_VGT_ESGS_RING_ITEMSIZE,
                       shader->selector->esgs_itemsize / 4);
        si_pm4_set_reg(pm4, R_00B320_SPI_SHADER_PGM_LO_ES, va >> 8);
        si_pm4_set_reg(pm4, R_00B324_SPI_SHADER_PGM_HI_ES, va >> 40);
        si_pm4_set_reg(pm4, R_00B328_SPI_SHADER_PGM_RSRC1_ES,
                       S_00B328_VGPRS((shader->config.num_vgprs - 1) / 4) |
                       S_00B328_SGPRS((shader->config.num_sgprs - 1) / 8) |
                       S_00B328_VGPR_COMP_CNT(vgpr_comp_cnt) |
                       S_00B328_DX10_CLAMP(1) |
                       S_00B328_FLOAT_MODE(shader->config.float_mode));
        si_pm4_set_reg(pm4, R_00B32C_SPI_SHADER_PGM_RSRC2_ES,
                       S_00B32C_USER_SGPR(num_user_sgprs) |
                       S_00B32C_OC_LDS_EN(oc_lds_en) |
                       S_00B32C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0));

        if (shader->selector->type == PIPE_SHADER_TESS_EVAL)
                si_set_tesseval_regs(sscreen, shader, pm4);
}

/**
 * Calculate the appropriate setting of VGT_GS_MODE when \p shader is a
 * geometry shader.
 */
static uint32_t si_vgt_gs_mode(struct si_shader *shader)
{
        unsigned gs_max_vert_out = shader->selector->gs_max_out_vertices;
        unsigned cut_mode;

        if (gs_max_vert_out <= 128) {
                cut_mode = V_028A40_GS_CUT_128;
        } else if (gs_max_vert_out <= 256) {
                cut_mode = V_028A40_GS_CUT_256;
        } else if (gs_max_vert_out <= 512) {
                cut_mode = V_028A40_GS_CUT_512;
        } else {
                assert(gs_max_vert_out <= 1024);
                cut_mode = V_028A40_GS_CUT_1024;
        }

        return S_028A40_MODE(V_028A40_GS_SCENARIO_G) |
               S_028A40_CUT_MODE(cut_mode)|
               S_028A40_ES_WRITE_OPTIMIZE(1) |
               S_028A40_GS_WRITE_OPTIMIZE(1);
}

static void si_shader_gs(struct si_shader *shader)
{
        unsigned gs_vert_itemsize = shader->selector->gsvs_vertex_size;
        unsigned gsvs_itemsize = shader->selector->max_gsvs_emit_size >> 2;
        unsigned gs_num_invocations = shader->selector->gs_num_invocations;
        struct si_pm4_state *pm4;
        uint64_t va;
        unsigned max_stream = shader->selector->max_gs_stream;

        /* The GSVS_RING_ITEMSIZE register takes 15 bits */
        assert(gsvs_itemsize < (1 << 15));

        pm4 = shader->pm4 = CALLOC_STRUCT(si_pm4_state);

        if (!pm4)
                return;

        si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE, si_vgt_gs_mode(shader));

        si_pm4_set_reg(pm4, R_028A60_VGT_GSVS_RING_OFFSET_1, gsvs_itemsize);
        si_pm4_set_reg(pm4, R_028A64_VGT_GSVS_RING_OFFSET_2, gsvs_itemsize * ((max_stream >= 2) ? 2 : 1));
        si_pm4_set_reg(pm4, R_028A68_VGT_GSVS_RING_OFFSET_3, gsvs_itemsize * ((max_stream >= 3) ? 3 : 1));

        si_pm4_set_reg(pm4, R_028AB0_VGT_GSVS_RING_ITEMSIZE, gsvs_itemsize * (max_stream + 1));

        si_pm4_set_reg(pm4, R_028B38_VGT_GS_MAX_VERT_OUT, shader->selector->gs_max_out_vertices);

        si_pm4_set_reg(pm4, R_028B5C_VGT_GS_VERT_ITEMSIZE, gs_vert_itemsize >> 2);
        si_pm4_set_reg(pm4, R_028B60_VGT_GS_VERT_ITEMSIZE_1, (max_stream >= 1) ? gs_vert_itemsize >> 2 : 0);
        si_pm4_set_reg(pm4, R_028B64_VGT_GS_VERT_ITEMSIZE_2, (max_stream >= 2) ? gs_vert_itemsize >> 2 : 0);
        si_pm4_set_reg(pm4, R_028B68_VGT_GS_VERT_ITEMSIZE_3, (max_stream >= 3) ? gs_vert_itemsize >> 2 : 0);

        si_pm4_set_reg(pm4, R_028B90_VGT_GS_INSTANCE_CNT,
                       S_028B90_CNT(MIN2(gs_num_invocations, 127)) |
                       S_028B90_ENABLE(gs_num_invocations > 0));

        va = shader->bo->gpu_address;
        si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_USER_SHADER);
        si_pm4_set_reg(pm4, R_00B220_SPI_SHADER_PGM_LO_GS, va >> 8);
        si_pm4_set_reg(pm4, R_00B224_SPI_SHADER_PGM_HI_GS, va >> 40);

        si_pm4_set_reg(pm4, R_00B228_SPI_SHADER_PGM_RSRC1_GS,
                       S_00B228_VGPRS((shader->config.num_vgprs - 1) / 4) |
                       S_00B228_SGPRS((shader->config.num_sgprs - 1) / 8) |
                       S_00B228_DX10_CLAMP(1) |
                       S_00B228_FLOAT_MODE(shader->config.float_mode));
        si_pm4_set_reg(pm4, R_00B22C_SPI_SHADER_PGM_RSRC2_GS,
                       S_00B22C_USER_SGPR(SI_GS_NUM_USER_SGPR) |
                       S_00B22C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0));
}

/**
 * Compute the state for \p shader, which will run as a vertex shader on the
 * hardware.
 *
 * If \p gs is non-NULL, it points to the geometry shader for which this shader
 * is the copy shader.
 */
static void si_shader_vs(struct si_screen *sscreen, struct si_shader *shader,
                         struct si_shader *gs)
{
        struct si_pm4_state *pm4;
        unsigned num_user_sgprs;
        unsigned nparams, vgpr_comp_cnt;
        uint64_t va;
        unsigned oc_lds_en;
        unsigned window_space =
           shader->selector->info.properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION];
        bool enable_prim_id = si_vs_exports_prim_id(shader);

        pm4 = shader->pm4 = CALLOC_STRUCT(si_pm4_state);

        if (!pm4)
                return;

        /* We always write VGT_GS_MODE in the VS state, because every switch
         * between different shader pipelines involving a different GS or no
         * GS at all involves a switch of the VS (different GS use different
         * copy shaders). On the other hand, when the API switches from a GS to
         * no GS and then back to the same GS used originally, the GS state is
         * not sent again.
         */
        if (!gs) {
                si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE,
                               S_028A40_MODE(enable_prim_id ? V_028A40_GS_SCENARIO_A : 0));
                si_pm4_set_reg(pm4, R_028A84_VGT_PRIMITIVEID_EN, enable_prim_id);
        } else {
                si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE, si_vgt_gs_mode(gs));
                si_pm4_set_reg(pm4, R_028A84_VGT_PRIMITIVEID_EN, 0);
        }

        va = shader->bo->gpu_address;
        si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_USER_SHADER);

        if (gs) {
                vgpr_comp_cnt = 0; /* only VertexID is needed for GS-COPY. */
                num_user_sgprs = SI_GSCOPY_NUM_USER_SGPR;
        } else if (shader->selector->type == PIPE_SHADER_VERTEX) {
                vgpr_comp_cnt = shader->info.uses_instanceid ? 3 : (enable_prim_id ? 2 : 0);
                num_user_sgprs = SI_VS_NUM_USER_SGPR;
        } else if (shader->selector->type == PIPE_SHADER_TESS_EVAL) {
                vgpr_comp_cnt = 3; /* all components are needed for TES */
                num_user_sgprs = SI_TES_NUM_USER_SGPR;
        } else
                unreachable("invalid shader selector type");

        /* VS is required to export at least one param. */
        nparams = MAX2(shader->info.nr_param_exports, 1);
        si_pm4_set_reg(pm4, R_0286C4_SPI_VS_OUT_CONFIG,
                       S_0286C4_VS_EXPORT_COUNT(nparams - 1));

        si_pm4_set_reg(pm4, R_02870C_SPI_SHADER_POS_FORMAT,
                       S_02870C_POS0_EXPORT_FORMAT(V_02870C_SPI_SHADER_4COMP) |
                       S_02870C_POS1_EXPORT_FORMAT(shader->info.nr_pos_exports > 1 ?
                                                   V_02870C_SPI_SHADER_4COMP :
                                                   V_02870C_SPI_SHADER_NONE) |
                       S_02870C_POS2_EXPORT_FORMAT(shader->info.nr_pos_exports > 2 ?
                                                   V_02870C_SPI_SHADER_4COMP :
                                                   V_02870C_SPI_SHADER_NONE) |
                       S_02870C_POS3_EXPORT_FORMAT(shader->info.nr_pos_exports > 3 ?
                                                   V_02870C_SPI_SHADER_4COMP :
                                                   V_02870C_SPI_SHADER_NONE));

        oc_lds_en = shader->selector->type == PIPE_SHADER_TESS_EVAL ? 1 : 0;

        si_pm4_set_reg(pm4, R_00B120_SPI_SHADER_PGM_LO_VS, va >> 8);
        si_pm4_set_reg(pm4, R_00B124_SPI_SHADER_PGM_HI_VS, va >> 40);
        si_pm4_set_reg(pm4, R_00B128_SPI_SHADER_PGM_RSRC1_VS,
                       S_00B128_VGPRS((shader->config.num_vgprs - 1) / 4) |
                       S_00B128_SGPRS((shader->config.num_sgprs - 1) / 8) |
                       S_00B128_VGPR_COMP_CNT(vgpr_comp_cnt) |
                       S_00B128_DX10_CLAMP(1) |
                       S_00B128_FLOAT_MODE(shader->config.float_mode));
        si_pm4_set_reg(pm4, R_00B12C_SPI_SHADER_PGM_RSRC2_VS,
                       S_00B12C_USER_SGPR(num_user_sgprs) |
                       S_00B12C_OC_LDS_EN(oc_lds_en) |
                       S_00B12C_SO_BASE0_EN(!!shader->selector->so.stride[0]) |
                       S_00B12C_SO_BASE1_EN(!!shader->selector->so.stride[1]) |
                       S_00B12C_SO_BASE2_EN(!!shader->selector->so.stride[2]) |
                       S_00B12C_SO_BASE3_EN(!!shader->selector->so.stride[3]) |
                       S_00B12C_SO_EN(!!shader->selector->so.num_outputs) |
                       S_00B12C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0));
        if (window_space)
                si_pm4_set_reg(pm4, R_028818_PA_CL_VTE_CNTL,
                               S_028818_VTX_XY_FMT(1) | S_028818_VTX_Z_FMT(1));
        else
                si_pm4_set_reg(pm4, R_028818_PA_CL_VTE_CNTL,
                               S_028818_VTX_W0_FMT(1) |
                               S_028818_VPORT_X_SCALE_ENA(1) | S_028818_VPORT_X_OFFSET_ENA(1) |
                               S_028818_VPORT_Y_SCALE_ENA(1) | S_028818_VPORT_Y_OFFSET_ENA(1) |
                               S_028818_VPORT_Z_SCALE_ENA(1) | S_028818_VPORT_Z_OFFSET_ENA(1));

        if (shader->selector->type == PIPE_SHADER_TESS_EVAL)
                si_set_tesseval_regs(sscreen, shader, pm4);
}

static unsigned si_get_ps_num_interp(struct si_shader *ps)
{
        struct tgsi_shader_info *info = &ps->selector->info;
        unsigned num_colors = !!(info->colors_read & 0x0f) +
                              !!(info->colors_read & 0xf0);
        unsigned num_interp = ps->selector->info.num_inputs +
                              (ps->key.ps.prolog.color_two_side ? num_colors : 0);

        assert(num_interp <= 32);
        return MIN2(num_interp, 32);
}

static unsigned si_get_spi_shader_col_format(struct si_shader *shader)
{
        unsigned value = shader->key.ps.epilog.spi_shader_col_format;
        unsigned i, num_targets = (util_last_bit(value) + 3) / 4;

        /* If the i-th target format is set, all previous target formats must
         * be non-zero to avoid hangs.
         */
        for (i = 0; i < num_targets; i++)
                if (!(value & (0xf << (i * 4))))
                        value |= V_028714_SPI_SHADER_32_R << (i * 4);

        return value;
}

static unsigned si_get_cb_shader_mask(unsigned spi_shader_col_format)
{
        unsigned i, cb_shader_mask = 0;

        for (i = 0; i < 8; i++) {
                switch ((spi_shader_col_format >> (i * 4)) & 0xf) {
                case V_028714_SPI_SHADER_ZERO:
                        break;
                case V_028714_SPI_SHADER_32_R:
                        cb_shader_mask |= 0x1 << (i * 4);
                        break;
                case V_028714_SPI_SHADER_32_GR:
                        cb_shader_mask |= 0x3 << (i * 4);
                        break;
                case V_028714_SPI_SHADER_32_AR:
                        cb_shader_mask |= 0x9 << (i * 4);
                        break;
                case V_028714_SPI_SHADER_FP16_ABGR:
                case V_028714_SPI_SHADER_UNORM16_ABGR:
                case V_028714_SPI_SHADER_SNORM16_ABGR:
                case V_028714_SPI_SHADER_UINT16_ABGR:
                case V_028714_SPI_SHADER_SINT16_ABGR:
                case V_028714_SPI_SHADER_32_ABGR:
                        cb_shader_mask |= 0xf << (i * 4);
                        break;
                default:
                        assert(0);
                }
        }
        return cb_shader_mask;
}

static void si_shader_ps(struct si_shader *shader)
{
        struct tgsi_shader_info *info = &shader->selector->info;
        struct si_pm4_state *pm4;
        unsigned spi_ps_in_control, spi_shader_col_format, cb_shader_mask;
        unsigned spi_baryc_cntl = S_0286E0_FRONT_FACE_ALL_BITS(1);
        uint64_t va;
        bool has_centroid;
        unsigned input_ena = shader->config.spi_ps_input_ena;

        /* we need to enable at least one of them, otherwise we hang the GPU */
        assert(G_0286CC_PERSP_SAMPLE_ENA(input_ena) ||
               G_0286CC_PERSP_CENTER_ENA(input_ena) ||
               G_0286CC_PERSP_CENTROID_ENA(input_ena) ||
               G_0286CC_PERSP_PULL_MODEL_ENA(input_ena) ||
               G_0286CC_LINEAR_SAMPLE_ENA(input_ena) ||
               G_0286CC_LINEAR_CENTER_ENA(input_ena) ||
               G_0286CC_LINEAR_CENTROID_ENA(input_ena) ||
               G_0286CC_LINE_STIPPLE_TEX_ENA(input_ena));

        pm4 = shader->pm4 = CALLOC_STRUCT(si_pm4_state);

        if (!pm4)
                return;

        /* SPI_BARYC_CNTL.POS_FLOAT_LOCATION
         * Possible vaules:
         * 0 -> Position = pixel center
         * 1 -> Position = pixel centroid
         * 2 -> Position = at sample position
         *
         * From GLSL 4.5 specification, section 7.1:
         *   "The variable gl_FragCoord is available as an input variable from
         *    within fragment shaders and it holds the window relative coordinates
         *    (x, y, z, 1/w) values for the fragment. If multi-sampling, this
         *    value can be for any location within the pixel, or one of the
         *    fragment samples. The use of centroid does not further restrict
         *    this value to be inside the current primitive."
         *
         * Meaning that centroid has no effect and we can return anything within
         * the pixel. Thus, return the value at sample position, because that's
         * the most accurate one shaders can get.
         */
        spi_baryc_cntl |= S_0286E0_POS_FLOAT_LOCATION(2);

        if (info->properties[TGSI_PROPERTY_FS_COORD_PIXEL_CENTER] ==
            TGSI_FS_COORD_PIXEL_CENTER_INTEGER)
                spi_baryc_cntl |= S_0286E0_POS_FLOAT_ULC(1);

        spi_shader_col_format = si_get_spi_shader_col_format(shader);
        cb_shader_mask = si_get_cb_shader_mask(spi_shader_col_format);

        /* Ensure that some export memory is always allocated, for two reasons:
         *
         * 1) Correctness: The hardware ignores the EXEC mask if no export
         *    memory is allocated, so KILL and alpha test do not work correctly
         *    without this.
         * 2) Performance: Every shader needs at least a NULL export, even when
         *    it writes no color/depth output. The NULL export instruction
         *    stalls without this setting.
         *
         * Don't add this to CB_SHADER_MASK.
         */
        if (!spi_shader_col_format &&
            !info->writes_z && !info->writes_stencil && !info->writes_samplemask)
                spi_shader_col_format = V_028714_SPI_SHADER_32_R;

        si_pm4_set_reg(pm4, R_0286CC_SPI_PS_INPUT_ENA, input_ena);
        si_pm4_set_reg(pm4, R_0286D0_SPI_PS_INPUT_ADDR,
                       shader->config.spi_ps_input_addr);

        /* Set interpolation controls. */
        has_centroid = G_0286CC_PERSP_CENTROID_ENA(shader->config.spi_ps_input_ena) ||
                       G_0286CC_LINEAR_CENTROID_ENA(shader->config.spi_ps_input_ena);

        spi_ps_in_control = S_0286D8_NUM_INTERP(si_get_ps_num_interp(shader)) |
                            S_0286D8_BC_OPTIMIZE_DISABLE(has_centroid);

        /* Set registers. */
        si_pm4_set_reg(pm4, R_0286E0_SPI_BARYC_CNTL, spi_baryc_cntl);
        si_pm4_set_reg(pm4, R_0286D8_SPI_PS_IN_CONTROL, spi_ps_in_control);

        si_pm4_set_reg(pm4, R_028710_SPI_SHADER_Z_FORMAT,
                       info->writes_samplemask ? V_028710_SPI_SHADER_32_ABGR :
                       info->writes_stencil ? V_028710_SPI_SHADER_32_GR :
                       info->writes_z ? V_028710_SPI_SHADER_32_R :
                       V_028710_SPI_SHADER_ZERO);

        si_pm4_set_reg(pm4, R_028714_SPI_SHADER_COL_FORMAT, spi_shader_col_format);
        si_pm4_set_reg(pm4, R_02823C_CB_SHADER_MASK, cb_shader_mask);

        va = shader->bo->gpu_address;
        si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_USER_SHADER);
        si_pm4_set_reg(pm4, R_00B020_SPI_SHADER_PGM_LO_PS, va >> 8);
        si_pm4_set_reg(pm4, R_00B024_SPI_SHADER_PGM_HI_PS, va >> 40);

        si_pm4_set_reg(pm4, R_00B028_SPI_SHADER_PGM_RSRC1_PS,
                       S_00B028_VGPRS((shader->config.num_vgprs - 1) / 4) |
                       S_00B028_SGPRS((shader->config.num_sgprs - 1) / 8) |
                       S_00B028_DX10_CLAMP(1) |
                       S_00B028_FLOAT_MODE(shader->config.float_mode));
        si_pm4_set_reg(pm4, R_00B02C_SPI_SHADER_PGM_RSRC2_PS,
                       S_00B02C_EXTRA_LDS_SIZE(shader->config.lds_size) |
                       S_00B02C_USER_SGPR(SI_PS_NUM_USER_SGPR) |
                       S_00B32C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0));

        /* Prefer RE_Z if the shader is complex enough. The requirement is either:
         * - the shader uses at least 2 VMEM instructions, or
         * - the code size is at least 50 2-dword instructions or 100 1-dword
         *   instructions.
         *
         * Shaders with side effects that must execute independently of the
         * depth test require LATE_Z.
         */
        if (info->writes_memory &&
            !info->properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL])
                shader->z_order = V_02880C_LATE_Z;
        else if (info->num_memory_instructions >= 2 ||
                 shader->binary.code_size > 100*4)
                shader->z_order = V_02880C_EARLY_Z_THEN_RE_Z;
        else
                shader->z_order = V_02880C_EARLY_Z_THEN_LATE_Z;
}

static void si_shader_init_pm4_state(struct si_screen *sscreen,
                                     struct si_shader *shader)
{

        if (shader->pm4)
                si_pm4_free_state_simple(shader->pm4);

        switch (shader->selector->type) {
        case PIPE_SHADER_VERTEX:
                if (shader->key.vs.as_ls)
                        si_shader_ls(shader);
                else if (shader->key.vs.as_es)
                        si_shader_es(sscreen, shader);
                else
                        si_shader_vs(sscreen, shader, NULL);
                break;
        case PIPE_SHADER_TESS_CTRL:
                si_shader_hs(shader);
                break;
        case PIPE_SHADER_TESS_EVAL:
                if (shader->key.tes.as_es)
                        si_shader_es(sscreen, shader);
                else
                        si_shader_vs(sscreen, shader, NULL);
                break;
        case PIPE_SHADER_GEOMETRY:
                si_shader_gs(shader);
                si_shader_vs(sscreen, shader->gs_copy_shader, shader);
                break;
        case PIPE_SHADER_FRAGMENT:
                si_shader_ps(shader);
                break;
        default:
                assert(0);
        }
}

static unsigned si_get_alpha_test_func(struct si_context *sctx)
{
        /* Alpha-test should be disabled if colorbuffer 0 is integer. */
        if (sctx->queued.named.dsa &&
            !sctx->framebuffer.cb0_is_integer)
                return sctx->queued.named.dsa->alpha_func;

        return PIPE_FUNC_ALWAYS;
}

/* Compute the key for the hw shader variant */
static inline void si_shader_selector_key(struct pipe_context *ctx,
                                          struct si_shader_selector *sel,
                                          union si_shader_key *key)
{
        struct si_context *sctx = (struct si_context *)ctx;
        unsigned i;

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

        switch (sel->type) {
        case PIPE_SHADER_VERTEX:
                if (sctx->vertex_elements) {
                        unsigned count = MIN2(sel->info.num_inputs,
                                              sctx->vertex_elements->count);
                        for (i = 0; i < count; ++i)
                                key->vs.prolog.instance_divisors[i] =
                                        sctx->vertex_elements->elements[i].instance_divisor;
                }
                if (sctx->tes_shader.cso)
                        key->vs.as_ls = 1;
                else if (sctx->gs_shader.cso)
                        key->vs.as_es = 1;

                if (!sctx->gs_shader.cso && sctx->ps_shader.cso &&
                    sctx->ps_shader.cso->info.uses_primid)
                        key->vs.epilog.export_prim_id = 1;
                break;
        case PIPE_SHADER_TESS_CTRL:
                key->tcs.epilog.prim_mode =
                        sctx->tes_shader.cso->info.properties[TGSI_PROPERTY_TES_PRIM_MODE];

                if (sel == sctx->fixed_func_tcs_shader.cso)
                        key->tcs.epilog.inputs_to_copy = sctx->vs_shader.cso->outputs_written;
                break;
        case PIPE_SHADER_TESS_EVAL:
                if (sctx->gs_shader.cso)
                        key->tes.as_es = 1;
                else if (sctx->ps_shader.cso && sctx->ps_shader.cso->info.uses_primid)
                        key->tes.epilog.export_prim_id = 1;
                break;
        case PIPE_SHADER_GEOMETRY:
                break;
        case PIPE_SHADER_FRAGMENT: {
                struct si_state_rasterizer *rs = sctx->queued.named.rasterizer;
                struct si_state_blend *blend = sctx->queued.named.blend;

                if (sel->info.properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS] &&
                    sel->info.colors_written == 0x1)
                        key->ps.epilog.last_cbuf = MAX2(sctx->framebuffer.state.nr_cbufs, 1) - 1;

                if (blend) {
                        /* Select the shader color format based on whether
                         * blending or alpha are needed.
                         */
                        key->ps.epilog.spi_shader_col_format =
                                (blend->blend_enable_4bit & blend->need_src_alpha_4bit &
                                 sctx->framebuffer.spi_shader_col_format_blend_alpha) |
                                (blend->blend_enable_4bit & ~blend->need_src_alpha_4bit &
                                 sctx->framebuffer.spi_shader_col_format_blend) |
                                (~blend->blend_enable_4bit & blend->need_src_alpha_4bit &
                                 sctx->framebuffer.spi_shader_col_format_alpha) |
                                (~blend->blend_enable_4bit & ~blend->need_src_alpha_4bit &
                                 sctx->framebuffer.spi_shader_col_format);
                } else
                        key->ps.epilog.spi_shader_col_format = sctx->framebuffer.spi_shader_col_format;

                /* If alpha-to-coverage is enabled, we have to export alpha
                 * even if there is no color buffer.
                 */
                if (!(key->ps.epilog.spi_shader_col_format & 0xf) &&
                    blend && blend->alpha_to_coverage)
                        key->ps.epilog.spi_shader_col_format |= V_028710_SPI_SHADER_32_AR;

                /* On SI and CIK except Hawaii, the CB doesn't clamp outputs
                 * to the range supported by the type if a channel has less
                 * than 16 bits and the export format is 16_ABGR.
                 */
                if (sctx->b.chip_class <= CIK && sctx->b.family != CHIP_HAWAII)
                        key->ps.epilog.color_is_int8 = sctx->framebuffer.color_is_int8;

                /* Disable unwritten outputs (if WRITE_ALL_CBUFS isn't enabled). */
                if (!key->ps.epilog.last_cbuf) {
                        key->ps.epilog.spi_shader_col_format &= sel->colors_written_4bit;
                        key->ps.epilog.color_is_int8 &= sel->info.colors_written;
                }

                if (rs) {
                        bool is_poly = (sctx->current_rast_prim >= PIPE_PRIM_TRIANGLES &&
                                        sctx->current_rast_prim <= PIPE_PRIM_POLYGON) ||
                                       sctx->current_rast_prim >= PIPE_PRIM_TRIANGLES_ADJACENCY;
                        bool is_line = !is_poly && sctx->current_rast_prim != PIPE_PRIM_POINTS;

                        key->ps.prolog.color_two_side = rs->two_side && sel->info.colors_read;

                        if (sctx->queued.named.blend) {
                                key->ps.epilog.alpha_to_one = sctx->queued.named.blend->alpha_to_one &&
                                                              rs->multisample_enable &&
                                                              !sctx->framebuffer.cb0_is_integer;
                        }

                        key->ps.prolog.poly_stipple = rs->poly_stipple_enable && is_poly;
                        key->ps.epilog.poly_line_smoothing = ((is_poly && rs->poly_smooth) ||
                                                              (is_line && rs->line_smooth)) &&
                                                             sctx->framebuffer.nr_samples <= 1;
                        key->ps.epilog.clamp_color = rs->clamp_fragment_color;

                        key->ps.prolog.force_persample_interp =
                                rs->force_persample_interp &&
                                rs->multisample_enable &&
                                sctx->framebuffer.nr_samples > 1 &&
                                sctx->ps_iter_samples > 1 &&
                                (sel->info.uses_persp_center ||
                                 sel->info.uses_persp_centroid ||
                                 sel->info.uses_linear_center ||
                                 sel->info.uses_linear_centroid);
                }

                key->ps.epilog.alpha_func = si_get_alpha_test_func(sctx);
                break;
        }
        default:
                assert(0);
        }
}

/* Select the hw shader variant depending on the current state. */
static int si_shader_select_with_key(struct pipe_context *ctx,
                                     struct si_shader_ctx_state *state,
                                     union si_shader_key *key)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = state->cso;
        struct si_shader *current = state->current;
        struct si_shader *iter, *shader = NULL;
        int r;

        /* Check if we don't need to change anything.
         * This path is also used for most shaders that don't need multiple
         * variants, it will cost just a computation of the key and this
         * test. */
        if (likely(current && memcmp(&current->key, key, sizeof(*key)) == 0))
                return 0;

        pipe_mutex_lock(sel->mutex);

        /* Find the shader variant. */
        for (iter = sel->first_variant; iter; iter = iter->next_variant) {
                /* Don't check the "current" shader. We checked it above. */
                if (current != iter &&
                    memcmp(&iter->key, key, sizeof(*key)) == 0) {
                        state->current = iter;
                        pipe_mutex_unlock(sel->mutex);
                        return 0;
                }
        }

        /* Build a new shader. */
        shader = CALLOC_STRUCT(si_shader);
        if (!shader) {
                pipe_mutex_unlock(sel->mutex);
                return -ENOMEM;
        }
        shader->selector = sel;
        shader->key = *key;

        r = si_shader_create(sctx->screen, sctx->tm, shader, &sctx->b.debug);
        if (unlikely(r)) {
                R600_ERR("Failed to build shader variant (type=%u) %d\n",
                         sel->type, r);
                FREE(shader);
                pipe_mutex_unlock(sel->mutex);
                return r;
        }
        si_shader_init_pm4_state(sctx->screen, shader);

        if (!sel->last_variant) {
                sel->first_variant = shader;
                sel->last_variant = shader;
        } else {
                sel->last_variant->next_variant = shader;
                sel->last_variant = shader;
        }
        state->current = shader;
        pipe_mutex_unlock(sel->mutex);
        return 0;
}

static int si_shader_select(struct pipe_context *ctx,
                            struct si_shader_ctx_state *state)
{
        union si_shader_key key;

        si_shader_selector_key(ctx, state->cso, &key);
        return si_shader_select_with_key(ctx, state, &key);
}

static void si_parse_next_shader_property(const struct tgsi_shader_info *info,
                                          union si_shader_key *key)
{
        unsigned next_shader = info->properties[TGSI_PROPERTY_NEXT_SHADER];

        switch (info->processor) {
        case PIPE_SHADER_VERTEX:
                switch (next_shader) {
                case PIPE_SHADER_GEOMETRY:
                        key->vs.as_es = 1;
                        break;
                case PIPE_SHADER_TESS_CTRL:
                case PIPE_SHADER_TESS_EVAL:
                        key->vs.as_ls = 1;
                        break;
                }
                break;

        case PIPE_SHADER_TESS_EVAL:
                if (next_shader == PIPE_SHADER_GEOMETRY)
                        key->tes.as_es = 1;
                break;
        }
}

static void *si_create_shader_selector(struct pipe_context *ctx,
                                       const struct pipe_shader_state *state)
{
        struct si_screen *sscreen = (struct si_screen *)ctx->screen;
        struct si_context *sctx = (struct si_context*)ctx;
        struct si_shader_selector *sel = CALLOC_STRUCT(si_shader_selector);
        int i;

        if (!sel)
                return NULL;

        sel->tokens = tgsi_dup_tokens(state->tokens);
        if (!sel->tokens) {
                FREE(sel);
                return NULL;
        }

        sel->so = state->stream_output;
        tgsi_scan_shader(state->tokens, &sel->info);
        sel->type = sel->info.processor;
        p_atomic_inc(&sscreen->b.num_shaders_created);

        /* Set which opcode uses which (i,j) pair. */
        if (sel->info.uses_persp_opcode_interp_centroid)
                sel->info.uses_persp_centroid = true;

        if (sel->info.uses_linear_opcode_interp_centroid)
                sel->info.uses_linear_centroid = true;

        if (sel->info.uses_persp_opcode_interp_offset ||
            sel->info.uses_persp_opcode_interp_sample)
                sel->info.uses_persp_center = true;

        if (sel->info.uses_linear_opcode_interp_offset ||
            sel->info.uses_linear_opcode_interp_sample)
                sel->info.uses_linear_center = true;

        switch (sel->type) {
        case PIPE_SHADER_GEOMETRY:
                sel->gs_output_prim =
                        sel->info.properties[TGSI_PROPERTY_GS_OUTPUT_PRIM];
                sel->gs_max_out_vertices =
                        sel->info.properties[TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES];
                sel->gs_num_invocations =
                        sel->info.properties[TGSI_PROPERTY_GS_INVOCATIONS];
                sel->gsvs_vertex_size = sel->info.num_outputs * 16;
                sel->max_gsvs_emit_size = sel->gsvs_vertex_size *
                                          sel->gs_max_out_vertices;

                sel->max_gs_stream = 0;
                for (i = 0; i < sel->so.num_outputs; i++)
                        sel->max_gs_stream = MAX2(sel->max_gs_stream,
                                                  sel->so.output[i].stream);

                sel->gs_input_verts_per_prim =
                        u_vertices_per_prim(sel->info.properties[TGSI_PROPERTY_GS_INPUT_PRIM]);
                break;

        case PIPE_SHADER_TESS_CTRL:
                /* Always reserve space for these. */
                sel->patch_outputs_written |=
                        (1llu << si_shader_io_get_unique_index(TGSI_SEMANTIC_TESSINNER, 0)) |
                        (1llu << si_shader_io_get_unique_index(TGSI_SEMANTIC_TESSOUTER, 0));
                /* fall through */
        case PIPE_SHADER_VERTEX:
        case PIPE_SHADER_TESS_EVAL:
                for (i = 0; i < sel->info.num_outputs; i++) {
                        unsigned name = sel->info.output_semantic_name[i];
                        unsigned index = sel->info.output_semantic_index[i];

                        switch (name) {
                        case TGSI_SEMANTIC_TESSINNER:
                        case TGSI_SEMANTIC_TESSOUTER:
                        case TGSI_SEMANTIC_PATCH:
                                sel->patch_outputs_written |=
                                        1llu << si_shader_io_get_unique_index(name, index);
                                break;
                        default:
                                sel->outputs_written |=
                                        1llu << si_shader_io_get_unique_index(name, index);
                        }
                }
                sel->esgs_itemsize = util_last_bit64(sel->outputs_written) * 16;
                break;

        case PIPE_SHADER_FRAGMENT:
                for (i = 0; i < 8; i++)
                        if (sel->info.colors_written & (1 << i))
                                sel->colors_written_4bit |= 0xf << (4 * i);

                for (i = 0; i < sel->info.num_inputs; i++) {
                        if (sel->info.input_semantic_name[i] == TGSI_SEMANTIC_COLOR) {
                                int index = sel->info.input_semantic_index[i];
                                sel->color_attr_index[index] = i;
                        }
                }
                break;
        }

        /* DB_SHADER_CONTROL */
        sel->db_shader_control =
                S_02880C_Z_EXPORT_ENABLE(sel->info.writes_z) |
                S_02880C_STENCIL_TEST_VAL_EXPORT_ENABLE(sel->info.writes_stencil) |
                S_02880C_MASK_EXPORT_ENABLE(sel->info.writes_samplemask) |
                S_02880C_KILL_ENABLE(sel->info.uses_kill);

        switch (sel->info.properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT]) {
        case TGSI_FS_DEPTH_LAYOUT_GREATER:
                sel->db_shader_control |=
                        S_02880C_CONSERVATIVE_Z_EXPORT(V_02880C_EXPORT_GREATER_THAN_Z);
                break;
        case TGSI_FS_DEPTH_LAYOUT_LESS:
                sel->db_shader_control |=
                        S_02880C_CONSERVATIVE_Z_EXPORT(V_02880C_EXPORT_LESS_THAN_Z);
                break;
        }

        if (sel->info.properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL])
                sel->db_shader_control |= S_02880C_DEPTH_BEFORE_SHADER(1);

        if (sel->info.writes_memory)
                sel->db_shader_control |= S_02880C_EXEC_ON_HIER_FAIL(1) |
                                          S_02880C_EXEC_ON_NOOP(1);

        /* Compile the main shader part for use with a prolog and/or epilog. */
        if (sel->type != PIPE_SHADER_GEOMETRY &&
            !sscreen->use_monolithic_shaders) {
                struct si_shader *shader = CALLOC_STRUCT(si_shader);
                void *tgsi_binary;

                if (!shader)
                        goto error;

                shader->selector = sel;
                si_parse_next_shader_property(&sel->info, &shader->key);

                tgsi_binary = si_get_tgsi_binary(sel);

                /* Try to load the shader from the shader cache. */
                pipe_mutex_lock(sscreen->shader_cache_mutex);

                if (tgsi_binary &&
                    si_shader_cache_load_shader(sscreen, tgsi_binary, shader)) {
                        FREE(tgsi_binary);
                } else {
                        /* Compile the shader if it hasn't been loaded from the cache. */
                        if (si_compile_tgsi_shader(sscreen, sctx->tm, shader, false,
                                                   &sctx->b.debug) != 0) {
                                FREE(shader);
                                FREE(tgsi_binary);
                                pipe_mutex_unlock(sscreen->shader_cache_mutex);
                                goto error;
                        }

                        if (tgsi_binary &&
                            !si_shader_cache_insert_shader(sscreen, tgsi_binary, shader))
                                FREE(tgsi_binary);
                }
                pipe_mutex_unlock(sscreen->shader_cache_mutex);

                sel->main_shader_part = shader;
        }

        /* Pre-compilation. */
        if (sel->type == PIPE_SHADER_GEOMETRY ||
            sscreen->b.debug_flags & DBG_PRECOMPILE) {
                struct si_shader_ctx_state state = {sel};
                union si_shader_key key;

                memset(&key, 0, sizeof(key));
                si_parse_next_shader_property(&sel->info, &key);

                /* Set reasonable defaults, so that the shader key doesn't
                 * cause any code to be eliminated.
                 */
                switch (sel->type) {
                case PIPE_SHADER_TESS_CTRL:
                        key.tcs.epilog.prim_mode = PIPE_PRIM_TRIANGLES;
                        break;
                case PIPE_SHADER_FRAGMENT:
                        key.ps.epilog.alpha_func = PIPE_FUNC_ALWAYS;
                        for (i = 0; i < 8; i++)
                                if (sel->info.colors_written & (1 << i))
                                        key.ps.epilog.spi_shader_col_format |=
                                                V_028710_SPI_SHADER_FP16_ABGR << (i * 4);
                        break;
                }

                if (si_shader_select_with_key(ctx, &state, &key))
                        goto error;
        }

        pipe_mutex_init(sel->mutex);
        return sel;

error:
        fprintf(stderr, "radeonsi: can't create a shader\n");
        tgsi_free_tokens(sel->tokens);
        FREE(sel);
        return NULL;
}

static void si_bind_vs_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = state;

        if (sctx->vs_shader.cso == sel)
                return;

        sctx->vs_shader.cso = sel;
        sctx->vs_shader.current = sel ? sel->first_variant : NULL;
        si_mark_atom_dirty(sctx, &sctx->clip_regs);
        r600_update_vs_writes_viewport_index(&sctx->b, si_get_vs_info(sctx));
}

static void si_bind_gs_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = state;
        bool enable_changed = !!sctx->gs_shader.cso != !!sel;

        if (sctx->gs_shader.cso == sel)
                return;

        sctx->gs_shader.cso = sel;
        sctx->gs_shader.current = sel ? sel->first_variant : NULL;
        si_mark_atom_dirty(sctx, &sctx->clip_regs);
        sctx->last_rast_prim = -1; /* reset this so that it gets updated */

        if (enable_changed)
                si_shader_change_notify(sctx);
        r600_update_vs_writes_viewport_index(&sctx->b, si_get_vs_info(sctx));
}

static void si_bind_tcs_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = state;
        bool enable_changed = !!sctx->tcs_shader.cso != !!sel;

        if (sctx->tcs_shader.cso == sel)
                return;

        sctx->tcs_shader.cso = sel;
        sctx->tcs_shader.current = sel ? sel->first_variant : NULL;

        if (enable_changed)
                sctx->last_tcs = NULL; /* invalidate derived tess state */
}

static void si_bind_tes_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = state;
        bool enable_changed = !!sctx->tes_shader.cso != !!sel;

        if (sctx->tes_shader.cso == sel)
                return;

        sctx->tes_shader.cso = sel;
        sctx->tes_shader.current = sel ? sel->first_variant : NULL;
        si_mark_atom_dirty(sctx, &sctx->clip_regs);
        sctx->last_rast_prim = -1; /* reset this so that it gets updated */

        if (enable_changed) {
                si_shader_change_notify(sctx);
                sctx->last_tes_sh_base = -1; /* invalidate derived tess state */
        }
        r600_update_vs_writes_viewport_index(&sctx->b, si_get_vs_info(sctx));
}

static void si_bind_ps_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = state;

        /* skip if supplied shader is one already in use */
        if (sctx->ps_shader.cso == sel)
                return;

        sctx->ps_shader.cso = sel;
        sctx->ps_shader.current = sel ? sel->first_variant : NULL;
        si_mark_atom_dirty(sctx, &sctx->cb_render_state);
}

static void si_delete_shader(struct si_context *sctx, struct si_shader *shader)
{
        if (shader->pm4) {
                switch (shader->selector->type) {
                case PIPE_SHADER_VERTEX:
                        if (shader->key.vs.as_ls)
                                si_pm4_delete_state(sctx, ls, shader->pm4);
                        else if (shader->key.vs.as_es)
                                si_pm4_delete_state(sctx, es, shader->pm4);
                        else
                                si_pm4_delete_state(sctx, vs, shader->pm4);
                        break;
                case PIPE_SHADER_TESS_CTRL:
                        si_pm4_delete_state(sctx, hs, shader->pm4);
                        break;
                case PIPE_SHADER_TESS_EVAL:
                        if (shader->key.tes.as_es)
                                si_pm4_delete_state(sctx, es, shader->pm4);
                        else
                                si_pm4_delete_state(sctx, vs, shader->pm4);
                        break;
                case PIPE_SHADER_GEOMETRY:
                        si_pm4_delete_state(sctx, gs, shader->pm4);
                        si_pm4_delete_state(sctx, vs, shader->gs_copy_shader->pm4);
                        break;
                case PIPE_SHADER_FRAGMENT:
                        si_pm4_delete_state(sctx, ps, shader->pm4);
                        break;
                }
        }

        si_shader_destroy(shader);
        free(shader);
}

static void si_delete_shader_selector(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *sel = (struct si_shader_selector *)state;
        struct si_shader *p = sel->first_variant, *c;
        struct si_shader_ctx_state *current_shader[SI_NUM_SHADERS] = {
                [PIPE_SHADER_VERTEX] = &sctx->vs_shader,
                [PIPE_SHADER_TESS_CTRL] = &sctx->tcs_shader,
                [PIPE_SHADER_TESS_EVAL] = &sctx->tes_shader,
                [PIPE_SHADER_GEOMETRY] = &sctx->gs_shader,
                [PIPE_SHADER_FRAGMENT] = &sctx->ps_shader,
        };

        if (current_shader[sel->type]->cso == sel) {
                current_shader[sel->type]->cso = NULL;
                current_shader[sel->type]->current = NULL;
        }

        while (p) {
                c = p->next_variant;
                si_delete_shader(sctx, p);
                p = c;
        }

        if (sel->main_shader_part)
                si_delete_shader(sctx, sel->main_shader_part);

        pipe_mutex_destroy(sel->mutex);
        free(sel->tokens);
        free(sel);
}

static unsigned si_get_ps_input_cntl(struct si_context *sctx,
                                     struct si_shader *vs, unsigned name,
                                     unsigned index, unsigned interpolate)
{
        struct tgsi_shader_info *vsinfo = &vs->selector->info;
        unsigned j, ps_input_cntl = 0;

        if (interpolate == TGSI_INTERPOLATE_CONSTANT ||
            (interpolate == TGSI_INTERPOLATE_COLOR && sctx->flatshade))
                ps_input_cntl |= S_028644_FLAT_SHADE(1);

        if (name == TGSI_SEMANTIC_PCOORD ||
            (name == TGSI_SEMANTIC_TEXCOORD &&
             sctx->sprite_coord_enable & (1 << index))) {
                ps_input_cntl |= S_028644_PT_SPRITE_TEX(1);
        }

        for (j = 0; j < vsinfo->num_outputs; j++) {
                if (name == vsinfo->output_semantic_name[j] &&
                    index == vsinfo->output_semantic_index[j]) {
                        ps_input_cntl |= S_028644_OFFSET(vs->info.vs_output_param_offset[j]);
                        break;
                }
        }

        if (name == TGSI_SEMANTIC_PRIMID)
                /* PrimID is written after the last output. */
                ps_input_cntl |= S_028644_OFFSET(vs->info.vs_output_param_offset[vsinfo->num_outputs]);
        else if (j == vsinfo->num_outputs && !G_028644_PT_SPRITE_TEX(ps_input_cntl)) {
                /* No corresponding output found, load defaults into input.
                 * Don't set any other bits.
                 * (FLAT_SHADE=1 completely changes behavior) */
                ps_input_cntl = S_028644_OFFSET(0x20);
                /* D3D 9 behaviour. GL is undefined */
                if (name == TGSI_SEMANTIC_COLOR && index == 0)
                        ps_input_cntl |= S_028644_DEFAULT_VAL(3);
        }
        return ps_input_cntl;
}

static void si_emit_spi_map(struct si_context *sctx, struct r600_atom *atom)
{
        struct radeon_winsys_cs *cs = sctx->b.gfx.cs;
        struct si_shader *ps = sctx->ps_shader.current;
        struct si_shader *vs = si_get_vs_state(sctx);
        struct tgsi_shader_info *psinfo = ps ? &ps->selector->info : NULL;
        unsigned i, num_interp, num_written = 0, bcol_interp[2];

        if (!ps || !ps->selector->info.num_inputs)
                return;

        num_interp = si_get_ps_num_interp(ps);
        assert(num_interp > 0);
        radeon_set_context_reg_seq(cs, R_028644_SPI_PS_INPUT_CNTL_0, num_interp);

        for (i = 0; i < psinfo->num_inputs; i++) {
                unsigned name = psinfo->input_semantic_name[i];
                unsigned index = psinfo->input_semantic_index[i];
                unsigned interpolate = psinfo->input_interpolate[i];

                radeon_emit(cs, si_get_ps_input_cntl(sctx, vs, name, index,
                                                     interpolate));
                num_written++;

                if (name == TGSI_SEMANTIC_COLOR) {
                        assert(index < ARRAY_SIZE(bcol_interp));
                        bcol_interp[index] = interpolate;
                }
        }

        if (ps->key.ps.prolog.color_two_side) {
                unsigned bcol = TGSI_SEMANTIC_BCOLOR;

                for (i = 0; i < 2; i++) {
                        if (!(psinfo->colors_read & (0xf << (i * 4))))
                                continue;

                        radeon_emit(cs, si_get_ps_input_cntl(sctx, vs, bcol,
                                                             i, bcol_interp[i]));
                        num_written++;
                }
        }
        assert(num_interp == num_written);
}

/**
 * Writing CONFIG or UCONFIG VGT registers requires VGT_FLUSH before that.
 */
static void si_init_config_add_vgt_flush(struct si_context *sctx)
{
        if (sctx->init_config_has_vgt_flush)
                return;

        /* VGT_FLUSH is required even if VGT is idle. It resets VGT pointers. */
        si_pm4_cmd_begin(sctx->init_config, PKT3_EVENT_WRITE);
        si_pm4_cmd_add(sctx->init_config, EVENT_TYPE(V_028A90_VGT_FLUSH) | EVENT_INDEX(0));
        si_pm4_cmd_end(sctx->init_config, false);
        sctx->init_config_has_vgt_flush = true;
}

/* Initialize state related to ESGS / GSVS ring buffers */
static bool si_update_gs_ring_buffers(struct si_context *sctx)
{
        struct si_shader_selector *es =
                sctx->tes_shader.cso ? sctx->tes_shader.cso : sctx->vs_shader.cso;
        struct si_shader_selector *gs = sctx->gs_shader.cso;
        struct si_pm4_state *pm4;

        /* Chip constants. */
        unsigned num_se = sctx->screen->b.info.max_se;
        unsigned wave_size = 64;
        unsigned max_gs_waves = 32 * num_se; /* max 32 per SE on GCN */
        unsigned gs_vertex_reuse = 16 * num_se; /* GS_VERTEX_REUSE register (per SE) */
        unsigned alignment = 256 * num_se;
        /* The maximum size is 63.999 MB per SE. */
        unsigned max_size = ((unsigned)(63.999 * 1024 * 1024) & ~255) * num_se;

        /* Calculate the minimum size. */
        unsigned min_esgs_ring_size = align(es->esgs_itemsize * gs_vertex_reuse *
                                            wave_size, alignment);

        /* These are recommended sizes, not minimum sizes. */
        unsigned esgs_ring_size = max_gs_waves * 2 * wave_size *
                                  es->esgs_itemsize * gs->gs_input_verts_per_prim;
        unsigned gsvs_ring_size = max_gs_waves * 2 * wave_size *
                                  gs->max_gsvs_emit_size * (gs->max_gs_stream + 1);

        min_esgs_ring_size = align(min_esgs_ring_size, alignment);
        esgs_ring_size = align(esgs_ring_size, alignment);
        gsvs_ring_size = align(gsvs_ring_size, alignment);

        esgs_ring_size = CLAMP(esgs_ring_size, min_esgs_ring_size, max_size);
        gsvs_ring_size = MIN2(gsvs_ring_size, max_size);

        /* Some rings don't have to be allocated if shaders don't use them.
         * (e.g. no varyings between ES and GS or GS and VS)
         */
        bool update_esgs = esgs_ring_size &&
                           (!sctx->esgs_ring ||
                            sctx->esgs_ring->width0 < esgs_ring_size);
        bool update_gsvs = gsvs_ring_size &&
                           (!sctx->gsvs_ring ||
                            sctx->gsvs_ring->width0 < gsvs_ring_size);

        if (!update_esgs && !update_gsvs)
                return true;

        if (update_esgs) {
                pipe_resource_reference(&sctx->esgs_ring, NULL);
                sctx->esgs_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
                                                     PIPE_USAGE_DEFAULT,
                                                     esgs_ring_size);
                if (!sctx->esgs_ring)
                        return false;
        }

        if (update_gsvs) {
                pipe_resource_reference(&sctx->gsvs_ring, NULL);
                sctx->gsvs_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
                                                     PIPE_USAGE_DEFAULT,
                                                     gsvs_ring_size);
                if (!sctx->gsvs_ring)
                        return false;
        }

        /* Create the "init_config_gs_rings" state. */
        pm4 = CALLOC_STRUCT(si_pm4_state);
        if (!pm4)
                return false;

        if (sctx->b.chip_class >= CIK) {
                if (sctx->esgs_ring)
                        si_pm4_set_reg(pm4, R_030900_VGT_ESGS_RING_SIZE,
                                       sctx->esgs_ring->width0 / 256);
                if (sctx->gsvs_ring)
                        si_pm4_set_reg(pm4, R_030904_VGT_GSVS_RING_SIZE,
                                       sctx->gsvs_ring->width0 / 256);
        } else {
                if (sctx->esgs_ring)
                        si_pm4_set_reg(pm4, R_0088C8_VGT_ESGS_RING_SIZE,
                                       sctx->esgs_ring->width0 / 256);
                if (sctx->gsvs_ring)
                        si_pm4_set_reg(pm4, R_0088CC_VGT_GSVS_RING_SIZE,
                                       sctx->gsvs_ring->width0 / 256);
        }

        /* Set the state. */
        if (sctx->init_config_gs_rings)
                si_pm4_free_state(sctx, sctx->init_config_gs_rings, ~0);
        sctx->init_config_gs_rings = pm4;

        if (!sctx->init_config_has_vgt_flush) {
                si_init_config_add_vgt_flush(sctx);
                si_pm4_upload_indirect_buffer(sctx, sctx->init_config);
        }

        /* Flush the context to re-emit both init_config states. */
        sctx->b.initial_gfx_cs_size = 0; /* force flush */
        si_context_gfx_flush(sctx, RADEON_FLUSH_ASYNC, NULL);

        /* Set ring bindings. */
        if (sctx->esgs_ring) {
                si_set_ring_buffer(&sctx->b.b, SI_ES_RING_ESGS,
                                   sctx->esgs_ring, 0, sctx->esgs_ring->width0,
                                   true, true, 4, 64, 0);
                si_set_ring_buffer(&sctx->b.b, SI_GS_RING_ESGS,
                                   sctx->esgs_ring, 0, sctx->esgs_ring->width0,
                                   false, false, 0, 0, 0);
        }
        if (sctx->gsvs_ring)
                si_set_ring_buffer(&sctx->b.b, SI_VS_RING_GSVS,
                                   sctx->gsvs_ring, 0, sctx->gsvs_ring->width0,
                                   false, false, 0, 0, 0);
        return true;
}

static void si_update_gsvs_ring_bindings(struct si_context *sctx)
{
        unsigned gsvs_itemsize = sctx->gs_shader.cso->max_gsvs_emit_size;
        uint64_t offset;

        if (!sctx->gsvs_ring || gsvs_itemsize == sctx->last_gsvs_itemsize)
                return;

        sctx->last_gsvs_itemsize = gsvs_itemsize;

        si_set_ring_buffer(&sctx->b.b, SI_GS_RING_GSVS0,
                           sctx->gsvs_ring, gsvs_itemsize,
                           64, true, true, 4, 16, 0);

        offset = gsvs_itemsize * 64;
        si_set_ring_buffer(&sctx->b.b, SI_GS_RING_GSVS1,
                           sctx->gsvs_ring, gsvs_itemsize,
                           64, true, true, 4, 16, offset);

        offset = (gsvs_itemsize * 2) * 64;
        si_set_ring_buffer(&sctx->b.b, SI_GS_RING_GSVS2,
                           sctx->gsvs_ring, gsvs_itemsize,
                           64, true, true, 4, 16, offset);

        offset = (gsvs_itemsize * 3) * 64;
        si_set_ring_buffer(&sctx->b.b, SI_GS_RING_GSVS3,
                           sctx->gsvs_ring, gsvs_itemsize,
                           64, true, true, 4, 16, offset);
}

/**
 * @returns 1 if \p sel has been updated to use a new scratch buffer
 *          0 if not
 *          < 0 if there was a failure
 */
static int si_update_scratch_buffer(struct si_context *sctx,
                                    struct si_shader *shader)
{
        uint64_t scratch_va = sctx->scratch_buffer->gpu_address;
        int r;

        if (!shader)
                return 0;

        /* This shader doesn't need a scratch buffer */
        if (shader->config.scratch_bytes_per_wave == 0)
                return 0;

        /* This shader is already configured to use the current
         * scratch buffer. */
        if (shader->scratch_bo == sctx->scratch_buffer)
                return 0;

        assert(sctx->scratch_buffer);

        si_shader_apply_scratch_relocs(sctx, shader, &shader->config, scratch_va);

        /* Replace the shader bo with a new bo that has the relocs applied. */
        r = si_shader_binary_upload(sctx->screen, shader);
        if (r)
                return r;

        /* Update the shader state to use the new shader bo. */
        si_shader_init_pm4_state(sctx->screen, shader);

        r600_resource_reference(&shader->scratch_bo, sctx->scratch_buffer);

        return 1;
}

static unsigned si_get_current_scratch_buffer_size(struct si_context *sctx)
{
        return sctx->scratch_buffer ? sctx->scratch_buffer->b.b.width0 : 0;
}

static unsigned si_get_scratch_buffer_bytes_per_wave(struct si_shader *shader)
{
        return shader ? shader->config.scratch_bytes_per_wave : 0;
}

static unsigned si_get_max_scratch_bytes_per_wave(struct si_context *sctx)
{
        unsigned bytes = 0;

        bytes = MAX2(bytes, si_get_scratch_buffer_bytes_per_wave(sctx->ps_shader.current));
        bytes = MAX2(bytes, si_get_scratch_buffer_bytes_per_wave(sctx->gs_shader.current));
        bytes = MAX2(bytes, si_get_scratch_buffer_bytes_per_wave(sctx->vs_shader.current));
        bytes = MAX2(bytes, si_get_scratch_buffer_bytes_per_wave(sctx->tcs_shader.current));
        bytes = MAX2(bytes, si_get_scratch_buffer_bytes_per_wave(sctx->tes_shader.current));
        return bytes;
}

static bool si_update_spi_tmpring_size(struct si_context *sctx)
{
        unsigned current_scratch_buffer_size =
                si_get_current_scratch_buffer_size(sctx);
        unsigned scratch_bytes_per_wave =
                si_get_max_scratch_bytes_per_wave(sctx);
        unsigned scratch_needed_size = scratch_bytes_per_wave *
                sctx->scratch_waves;
        unsigned spi_tmpring_size;
        int r;

        if (scratch_needed_size > 0) {
                if (scratch_needed_size > current_scratch_buffer_size) {
                        /* Create a bigger scratch buffer */
                        r600_resource_reference(&sctx->scratch_buffer, NULL);

                        sctx->scratch_buffer =
                                        si_resource_create_custom(&sctx->screen->b.b,
                                        PIPE_USAGE_DEFAULT, scratch_needed_size);
                        if (!sctx->scratch_buffer)
                                return false;
                        sctx->emit_scratch_reloc = true;
                }

                /* Update the shaders, so they are using the latest scratch.  The
                 * scratch buffer may have been changed since these shaders were
                 * last used, so we still need to try to update them, even if
                 * they require scratch buffers smaller than the current size.
                 */
                r = si_update_scratch_buffer(sctx, sctx->ps_shader.current);
                if (r < 0)
                        return false;
                if (r == 1)
                        si_pm4_bind_state(sctx, ps, sctx->ps_shader.current->pm4);

                r = si_update_scratch_buffer(sctx, sctx->gs_shader.current);
                if (r < 0)
                        return false;
                if (r == 1)
                        si_pm4_bind_state(sctx, gs, sctx->gs_shader.current->pm4);

                r = si_update_scratch_buffer(sctx, sctx->tcs_shader.current);
                if (r < 0)
                        return false;
                if (r == 1)
                        si_pm4_bind_state(sctx, hs, sctx->tcs_shader.current->pm4);

                /* VS can be bound as LS, ES, or VS. */
                r = si_update_scratch_buffer(sctx, sctx->vs_shader.current);
                if (r < 0)
                        return false;
                if (r == 1) {
                        if (sctx->tes_shader.current)
                                si_pm4_bind_state(sctx, ls, sctx->vs_shader.current->pm4);
                        else if (sctx->gs_shader.current)
                                si_pm4_bind_state(sctx, es, sctx->vs_shader.current->pm4);
                        else
                                si_pm4_bind_state(sctx, vs, sctx->vs_shader.current->pm4);
                }

                /* TES can be bound as ES or VS. */
                r = si_update_scratch_buffer(sctx, sctx->tes_shader.current);
                if (r < 0)
                        return false;
                if (r == 1) {
                        if (sctx->gs_shader.current)
                                si_pm4_bind_state(sctx, es, sctx->tes_shader.current->pm4);
                        else
                                si_pm4_bind_state(sctx, vs, sctx->tes_shader.current->pm4);
                }
        }

        /* The LLVM shader backend should be reporting aligned scratch_sizes. */
        assert((scratch_needed_size & ~0x3FF) == scratch_needed_size &&
                "scratch size should already be aligned correctly.");

        spi_tmpring_size = S_0286E8_WAVES(sctx->scratch_waves) |
                           S_0286E8_WAVESIZE(scratch_bytes_per_wave >> 10);
        if (spi_tmpring_size != sctx->spi_tmpring_size) {
                sctx->spi_tmpring_size = spi_tmpring_size;
                sctx->emit_scratch_reloc = true;
        }
        return true;
}

static void si_init_tess_factor_ring(struct si_context *sctx)
{
        bool double_offchip_buffers = sctx->b.chip_class >= CIK;
        unsigned max_offchip_buffers_per_se = double_offchip_buffers ? 128 : 64;
        unsigned max_offchip_buffers = max_offchip_buffers_per_se *
                                       sctx->screen->b.info.max_se;
        unsigned offchip_granularity;

        switch (sctx->screen->tess_offchip_block_dw_size) {
        default:
                assert(0);
                /* fall through */
        case 8192:
                offchip_granularity = V_03093C_X_8K_DWORDS;
                break;
        case 4096:
                offchip_granularity = V_03093C_X_4K_DWORDS;
                break;
        }

        switch (sctx->b.chip_class) {
        case SI:
                max_offchip_buffers = MIN2(max_offchip_buffers, 126);
                break;
        case CIK:
                max_offchip_buffers = MIN2(max_offchip_buffers, 508);
                break;
        case VI:
        default:
                max_offchip_buffers = MIN2(max_offchip_buffers, 512);
                break;
        }

        assert(!sctx->tf_ring);
        sctx->tf_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
                                           PIPE_USAGE_DEFAULT,
                                           32768 * sctx->screen->b.info.max_se);
        if (!sctx->tf_ring)
                return;

        assert(((sctx->tf_ring->width0 / 4) & C_030938_SIZE) == 0);

        sctx->tess_offchip_ring = pipe_buffer_create(sctx->b.b.screen,
                                                     PIPE_BIND_CUSTOM,
                                                     PIPE_USAGE_DEFAULT,
                                                     max_offchip_buffers *
                                                     sctx->screen->tess_offchip_block_dw_size * 4);
        if (!sctx->tess_offchip_ring)
                return;

        si_init_config_add_vgt_flush(sctx);

        /* Append these registers to the init config state. */
        if (sctx->b.chip_class >= CIK) {
                if (sctx->b.chip_class >= VI)
                        --max_offchip_buffers;

                si_pm4_set_reg(sctx->init_config, R_030938_VGT_TF_RING_SIZE,
                               S_030938_SIZE(sctx->tf_ring->width0 / 4));
                si_pm4_set_reg(sctx->init_config, R_030940_VGT_TF_MEMORY_BASE,
                               r600_resource(sctx->tf_ring)->gpu_address >> 8);
                si_pm4_set_reg(sctx->init_config, R_03093C_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);
                si_pm4_set_reg(sctx->init_config, R_008988_VGT_TF_RING_SIZE,
                               S_008988_SIZE(sctx->tf_ring->width0 / 4));
                si_pm4_set_reg(sctx->init_config, R_0089B8_VGT_TF_MEMORY_BASE,
                               r600_resource(sctx->tf_ring)->gpu_address >> 8);
                si_pm4_set_reg(sctx->init_config, R_0089B0_VGT_HS_OFFCHIP_PARAM,
                               S_0089B0_OFFCHIP_BUFFERING(max_offchip_buffers));
        }

        /* Flush the context to re-emit the init_config state.
         * This is done only once in a lifetime of a context.
         */
        si_pm4_upload_indirect_buffer(sctx, sctx->init_config);
        sctx->b.initial_gfx_cs_size = 0; /* force flush */
        si_context_gfx_flush(sctx, RADEON_FLUSH_ASYNC, NULL);

        si_set_ring_buffer(&sctx->b.b, SI_HS_RING_TESS_FACTOR, sctx->tf_ring,
                           0, sctx->tf_ring->width0, false, false, 0, 0, 0);

        si_set_ring_buffer(&sctx->b.b, SI_HS_RING_TESS_OFFCHIP,
                           sctx->tess_offchip_ring, 0,
                           sctx->tess_offchip_ring->width0, false, false, 0, 0, 0);
}

/**
 * This is used when TCS is NULL in the VS->TCS->TES chain. In this case,
 * VS passes its outputs to TES directly, so the fixed-function shader only
 * has to write TESSOUTER and TESSINNER.
 */
static void si_generate_fixed_func_tcs(struct si_context *sctx)
{
        struct ureg_src outer, inner;
        struct ureg_dst tessouter, tessinner;
        struct ureg_program *ureg = ureg_create(PIPE_SHADER_TESS_CTRL);

        if (!ureg)
                return; /* if we get here, we're screwed */

        assert(!sctx->fixed_func_tcs_shader.cso);

        outer = ureg_DECL_system_value(ureg,
                                       TGSI_SEMANTIC_DEFAULT_TESSOUTER_SI, 0);
        inner = ureg_DECL_system_value(ureg,
                                       TGSI_SEMANTIC_DEFAULT_TESSINNER_SI, 0);

        tessouter = ureg_DECL_output(ureg, TGSI_SEMANTIC_TESSOUTER, 0);
        tessinner = ureg_DECL_output(ureg, TGSI_SEMANTIC_TESSINNER, 0);

        ureg_MOV(ureg, tessouter, outer);
        ureg_MOV(ureg, tessinner, inner);
        ureg_END(ureg);

        sctx->fixed_func_tcs_shader.cso =
                ureg_create_shader_and_destroy(ureg, &sctx->b.b);
}

static void si_update_vgt_shader_config(struct si_context *sctx)
{
        /* Calculate the index of the config.
         * 0 = VS, 1 = VS+GS, 2 = VS+Tess, 3 = VS+Tess+GS */
        unsigned index = 2*!!sctx->tes_shader.cso + !!sctx->gs_shader.cso;
        struct si_pm4_state **pm4 = &sctx->vgt_shader_config[index];

        if (!*pm4) {
                uint32_t stages = 0;

                *pm4 = CALLOC_STRUCT(si_pm4_state);

                if (sctx->tes_shader.cso) {
                        stages |= S_028B54_LS_EN(V_028B54_LS_STAGE_ON) |
                                  S_028B54_HS_EN(1) | S_028B54_DYNAMIC_HS(1);

                        if (sctx->gs_shader.cso)
                                stages |= S_028B54_ES_EN(V_028B54_ES_STAGE_DS) |
                                          S_028B54_GS_EN(1) |
                                          S_028B54_VS_EN(V_028B54_VS_STAGE_COPY_SHADER);
                        else
                                stages |= S_028B54_VS_EN(V_028B54_VS_STAGE_DS);
                } else if (sctx->gs_shader.cso) {
                        stages |= S_028B54_ES_EN(V_028B54_ES_STAGE_REAL) |
                                  S_028B54_GS_EN(1) |
                                  S_028B54_VS_EN(V_028B54_VS_STAGE_COPY_SHADER);
                }

                si_pm4_set_reg(*pm4, R_028B54_VGT_SHADER_STAGES_EN, stages);
        }
        si_pm4_bind_state(sctx, vgt_shader_config, *pm4);
}

static void si_update_so(struct si_context *sctx, struct si_shader_selector *shader)
{
        struct pipe_stream_output_info *so = &shader->so;
        uint32_t enabled_stream_buffers_mask = 0;
        int i;

        for (i = 0; i < so->num_outputs; i++)
                enabled_stream_buffers_mask |= (1 << so->output[i].output_buffer) << (so->output[i].stream * 4);
        sctx->b.streamout.enabled_stream_buffers_mask = enabled_stream_buffers_mask;
        sctx->b.streamout.stride_in_dw = shader->so.stride;
}

bool si_update_shaders(struct si_context *sctx)
{
        struct pipe_context *ctx = (struct pipe_context*)sctx;
        struct si_state_rasterizer *rs = sctx->queued.named.rasterizer;
        int r;

        /* Update stages before GS. */
        if (sctx->tes_shader.cso) {
                if (!sctx->tf_ring) {
                        si_init_tess_factor_ring(sctx);
                        if (!sctx->tf_ring)
                                return false;
                }

                /* VS as LS */
                r = si_shader_select(ctx, &sctx->vs_shader);
                if (r)
                        return false;
                si_pm4_bind_state(sctx, ls, sctx->vs_shader.current->pm4);

                if (sctx->tcs_shader.cso) {
                        r = si_shader_select(ctx, &sctx->tcs_shader);
                        if (r)
                                return false;
                        si_pm4_bind_state(sctx, hs, sctx->tcs_shader.current->pm4);
                } else {
                        if (!sctx->fixed_func_tcs_shader.cso) {
                                si_generate_fixed_func_tcs(sctx);
                                if (!sctx->fixed_func_tcs_shader.cso)
                                        return false;
                        }

                        r = si_shader_select(ctx, &sctx->fixed_func_tcs_shader);
                        if (r)
                                return false;
                        si_pm4_bind_state(sctx, hs,
                                          sctx->fixed_func_tcs_shader.current->pm4);
                }

                r = si_shader_select(ctx, &sctx->tes_shader);
                if (r)
                        return false;

                if (sctx->gs_shader.cso) {
                        /* TES as ES */
                        si_pm4_bind_state(sctx, es, sctx->tes_shader.current->pm4);
                } else {
                        /* TES as VS */
                        si_pm4_bind_state(sctx, vs, sctx->tes_shader.current->pm4);
                        si_update_so(sctx, sctx->tes_shader.cso);
                }
        } else if (sctx->gs_shader.cso) {
                /* VS as ES */
                r = si_shader_select(ctx, &sctx->vs_shader);
                if (r)
                        return false;
                si_pm4_bind_state(sctx, es, sctx->vs_shader.current->pm4);
        } else {
                /* VS as VS */
                r = si_shader_select(ctx, &sctx->vs_shader);
                if (r)
                        return false;
                si_pm4_bind_state(sctx, vs, sctx->vs_shader.current->pm4);
                si_update_so(sctx, sctx->vs_shader.cso);
        }

        /* Update GS. */
        if (sctx->gs_shader.cso) {
                r = si_shader_select(ctx, &sctx->gs_shader);
                if (r)
                        return false;
                si_pm4_bind_state(sctx, gs, sctx->gs_shader.current->pm4);
                si_pm4_bind_state(sctx, vs, sctx->gs_shader.current->gs_copy_shader->pm4);
                si_update_so(sctx, sctx->gs_shader.cso);

                if (!si_update_gs_ring_buffers(sctx))
                        return false;

                si_update_gsvs_ring_bindings(sctx);
        } else {
                si_pm4_bind_state(sctx, gs, NULL);
                si_pm4_bind_state(sctx, es, NULL);
        }

        si_update_vgt_shader_config(sctx);

        if (sctx->ps_shader.cso) {
                unsigned db_shader_control;

                r = si_shader_select(ctx, &sctx->ps_shader);
                if (r)
                        return false;
                si_pm4_bind_state(sctx, ps, sctx->ps_shader.current->pm4);

                db_shader_control =
                        sctx->ps_shader.cso->db_shader_control |
                        S_02880C_KILL_ENABLE(si_get_alpha_test_func(sctx) != PIPE_FUNC_ALWAYS) |
                        S_02880C_Z_ORDER(sctx->ps_shader.current->z_order);

                if (si_pm4_state_changed(sctx, ps) || si_pm4_state_changed(sctx, vs) ||
                    sctx->sprite_coord_enable != rs->sprite_coord_enable ||
                    sctx->flatshade != rs->flatshade) {
                        sctx->sprite_coord_enable = rs->sprite_coord_enable;
                        sctx->flatshade = rs->flatshade;
                        si_mark_atom_dirty(sctx, &sctx->spi_map);
                }

                if (sctx->b.family == CHIP_STONEY && si_pm4_state_changed(sctx, ps))
                        si_mark_atom_dirty(sctx, &sctx->cb_render_state);

                if (sctx->ps_db_shader_control != db_shader_control) {
                        sctx->ps_db_shader_control = db_shader_control;
                        si_mark_atom_dirty(sctx, &sctx->db_render_state);
                }

                if (sctx->smoothing_enabled != sctx->ps_shader.current->key.ps.epilog.poly_line_smoothing) {
                        sctx->smoothing_enabled = sctx->ps_shader.current->key.ps.epilog.poly_line_smoothing;
                        si_mark_atom_dirty(sctx, &sctx->msaa_config);

                        if (sctx->b.chip_class == SI)
                                si_mark_atom_dirty(sctx, &sctx->db_render_state);
                }
        }

        if (si_pm4_state_changed(sctx, ls) ||
            si_pm4_state_changed(sctx, hs) ||
            si_pm4_state_changed(sctx, es) ||
            si_pm4_state_changed(sctx, gs) ||
            si_pm4_state_changed(sctx, vs) ||
            si_pm4_state_changed(sctx, ps)) {
                if (!si_update_spi_tmpring_size(sctx))
                        return false;
        }
        return true;
}

void si_init_shader_functions(struct si_context *sctx)
{
        si_init_atom(sctx, &sctx->spi_map, &sctx->atoms.s.spi_map, si_emit_spi_map);

        sctx->b.b.create_vs_state = si_create_shader_selector;
        sctx->b.b.create_tcs_state = si_create_shader_selector;
        sctx->b.b.create_tes_state = si_create_shader_selector;
        sctx->b.b.create_gs_state = si_create_shader_selector;
        sctx->b.b.create_fs_state = si_create_shader_selector;

        sctx->b.b.bind_vs_state = si_bind_vs_shader;
        sctx->b.b.bind_tcs_state = si_bind_tcs_shader;
        sctx->b.b.bind_tes_state = si_bind_tes_shader;
        sctx->b.b.bind_gs_state = si_bind_gs_shader;
        sctx->b.b.bind_fs_state = si_bind_ps_shader;

        sctx->b.b.delete_vs_state = si_delete_shader_selector;
        sctx->b.b.delete_tcs_state = si_delete_shader_selector;
        sctx->b.b.delete_tes_state = si_delete_shader_selector;
        sctx->b.b.delete_gs_state = si_delete_shader_selector;
        sctx->b.b.delete_fs_state = si_delete_shader_selector;
}