[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.
 */

#include "si_pipe.h"
#include "sid.h"
#include "gfx9d.h"
#include "radeon/r600_cs.h"

#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_ureg.h"
#include "util/hash_table.h"
#include "util/crc32.h"
#include "util/u_async_debug.h"
#include "util/u_memory.h"
#include "util/u_prim.h"

#include "util/disk_cache.h"
#include "util/mesa-sha1.h"
#include "ac_exp_param.h"
#include "ac_shader_util.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);
        if (!*size)
                return ptr;
        *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 = shader->binary.disasm_string ?
                               strlen(shader->binary.disasm_string) + 1 : 0;
        unsigned llvm_ir_size = shader->binary.llvm_ir_string ?
                                strlen(shader->binary.llvm_ir_string) + 1 : 0;
        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) +
                4 + align(llvm_ir_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);
        ptr = write_chunk(ptr, shader->binary.llvm_ir_string, llvm_ir_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);
        ptr = read_chunk(ptr, (void**)&shader->binary.llvm_ir_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,
                                          bool insert_into_disk_cache)
{
        void *hw_binary;
        struct hash_entry *entry;
        uint8_t key[CACHE_KEY_SIZE];

        entry = _mesa_hash_table_search(sscreen->shader_cache, tgsi_binary);
        if (entry)
                return false; /* already added */

        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;
        }

        if (sscreen->disk_shader_cache && insert_into_disk_cache) {
                disk_cache_compute_key(sscreen->disk_shader_cache, tgsi_binary,
                                       *((uint32_t *)tgsi_binary), key);
                disk_cache_put(sscreen->disk_shader_cache, key, hw_binary,
                               *((uint32_t *) hw_binary), NULL);
        }

        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) {
                if (sscreen->disk_shader_cache) {
                        unsigned char sha1[CACHE_KEY_SIZE];
                        size_t tg_size = *((uint32_t *) tgsi_binary);

                        disk_cache_compute_key(sscreen->disk_shader_cache,
                                               tgsi_binary, tg_size, sha1);

                        size_t binary_size;
                        uint8_t *buffer =
                                disk_cache_get(sscreen->disk_shader_cache,
                                               sha1, &binary_size);
                        if (!buffer)
                                return false;

                        if (binary_size < sizeof(uint32_t) ||
                            *((uint32_t*)buffer) != binary_size) {
                                 /* Something has gone wrong discard the item
                                  * from the cache and rebuild/link from
                                  * source.
                                  */
                                assert(!"Invalid radeonsi shader disk cache "
                                       "item!");

                                disk_cache_remove(sscreen->disk_shader_cache,
                                                  sha1);
                                free(buffer);

                                return false;
                        }

                        if (!si_load_shader_binary(shader, buffer)) {
                                free(buffer);
                                return false;
                        }
                        free(buffer);

                        if (!si_shader_cache_insert_shader(sscreen, tgsi_binary,
                                                           shader, false))
                                FREE(tgsi_binary);
                } else {
                        return false;
                }
        } else {
                if (si_load_shader_binary(shader, entry->data))
                        FREE(tgsi_binary);
                else
                        return false;
        }
        p_atomic_inc(&sscreen->num_shader_cache_hits);
        return true;
}

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)
{
        (void) mtx_init(&sscreen->shader_cache_mutex, mtx_plain);
        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);
        mtx_destroy(&sscreen->shader_cache_mutex);
}

/* SHADER STATES */

static void si_set_tesseval_regs(struct si_screen *sscreen,
                                 struct si_shader_selector *tes,
                                 struct si_pm4_state *pm4)
{
        struct tgsi_shader_info *info = &tes->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->info.family == CHIP_FIJI ||
                    sscreen->info.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));
}

/* Polaris needs different VTX_REUSE_DEPTH settings depending on
 * whether the "fractional odd" tessellation spacing is used.
 *
 * Possible VGT configurations and which state should set the register:
 *
 *   Reg set in | VGT shader configuration   | Value
 * ------------------------------------------------------
 *     VS as VS | VS                         | 30
 *     VS as ES | ES -> GS -> VS             | 30
 *    TES as VS | LS -> HS -> VS             | 14 or 30
 *    TES as ES | LS -> HS -> ES -> GS -> VS | 14 or 30
 *
 * If "shader" is NULL, it's assumed it's not LS or GS copy shader.
 */
static void polaris_set_vgt_vertex_reuse(struct si_screen *sscreen,
                                         struct si_shader_selector *sel,
                                         struct si_shader *shader,
                                         struct si_pm4_state *pm4)
{
        unsigned type = sel->type;

        if (sscreen->info.family < CHIP_POLARIS10)
                return;

        /* VS as VS, or VS as ES: */
        if ((type == PIPE_SHADER_VERTEX &&
             (!shader ||
              (!shader->key.as_ls && !shader->is_gs_copy_shader))) ||
            /* TES as VS, or TES as ES: */
            type == PIPE_SHADER_TESS_EVAL) {
                unsigned vtx_reuse_depth = 30;

                if (type == PIPE_SHADER_TESS_EVAL &&
                    sel->info.properties[TGSI_PROPERTY_TES_SPACING] ==
                    PIPE_TESS_SPACING_FRACTIONAL_ODD)
                        vtx_reuse_depth = 14;

                si_pm4_set_reg(pm4, R_028C58_VGT_VERTEX_REUSE_BLOCK_CNTL,
                               vtx_reuse_depth);
        }
}

static struct si_pm4_state *si_get_shader_pm4_state(struct si_shader *shader)
{
        if (shader->pm4)
                si_pm4_clear_state(shader->pm4);
        else
                shader->pm4 = CALLOC_STRUCT(si_pm4_state);

        return shader->pm4;
}

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

        assert(sscreen->info.chip_class <= VI);

        pm4 = si_get_shader_pm4_state(shader);
        if (!pm4)
                return;

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

        /* We need at least 2 components for LS.
         * VGPR0-3: (VertexID, RelAutoindex, InstanceID / StepRate0, InstanceID).
         * StepRate0 is set to 1. so that VGPR3 doesn't have to be loaded.
         */
        vgpr_comp_cnt = shader->info.uses_instanceid ? 2 : 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_VS_NUM_USER_SGPR) |
                           S_00B52C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0);
}

static void si_shader_hs(struct si_screen *sscreen, struct si_shader *shader)
{
        struct si_pm4_state *pm4;
        uint64_t va;
        unsigned ls_vgpr_comp_cnt = 0;

        pm4 = si_get_shader_pm4_state(shader);
        if (!pm4)
                return;

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

        if (sscreen->info.chip_class >= GFX9) {
                si_pm4_set_reg(pm4, R_00B410_SPI_SHADER_PGM_LO_LS, va >> 8);
                si_pm4_set_reg(pm4, R_00B414_SPI_SHADER_PGM_HI_LS, va >> 40);

                /* We need at least 2 components for LS.
                 * VGPR0-3: (VertexID, RelAutoindex, InstanceID / StepRate0, InstanceID).
                 * StepRate0 is set to 1. so that VGPR3 doesn't have to be loaded.
                 */
                ls_vgpr_comp_cnt = shader->info.uses_instanceid ? 2 : 1;

                shader->config.rsrc2 =
                        S_00B42C_USER_SGPR(GFX9_TCS_NUM_USER_SGPR) |
                        S_00B42C_USER_SGPR_MSB(GFX9_TCS_NUM_USER_SGPR >> 5) |
                        S_00B42C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0);
        } else {
                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);

                shader->config.rsrc2 =
                        S_00B42C_USER_SGPR(GFX6_TCS_NUM_USER_SGPR) |
                        S_00B42C_OC_LDS_EN(1) |
                        S_00B42C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0);
        }

        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) |
                       S_00B428_LS_VGPR_COMP_CNT(ls_vgpr_comp_cnt));

        if (sscreen->info.chip_class <= VI) {
                si_pm4_set_reg(pm4, R_00B42C_SPI_SHADER_PGM_RSRC2_HS,
                               shader->config.rsrc2);
        }
}

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;

        assert(sscreen->info.chip_class <= VI);

        pm4 = si_get_shader_pm4_state(shader);
        if (!pm4)
                return;

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

        if (shader->selector->type == PIPE_SHADER_VERTEX) {
                /* VGPR0-3: (VertexID, InstanceID / StepRate0, ...) */
                vgpr_comp_cnt = shader->info.uses_instanceid ? 1 : 0;
                num_user_sgprs = SI_VS_NUM_USER_SGPR;
        } else if (shader->selector->type == PIPE_SHADER_TESS_EVAL) {
                vgpr_comp_cnt = shader->selector->info.uses_primid ? 3 : 2;
                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->selector, pm4);

        polaris_set_vgt_vertex_reuse(sscreen, shader->selector, shader, pm4);
}

struct gfx9_gs_info {
        unsigned es_verts_per_subgroup;
        unsigned gs_prims_per_subgroup;
        unsigned gs_inst_prims_in_subgroup;
        unsigned max_prims_per_subgroup;
        unsigned lds_size;
};

static void gfx9_get_gs_info(struct si_shader_selector *es,
                                   struct si_shader_selector *gs,
                                   struct gfx9_gs_info *out)
{
        unsigned gs_num_invocations = MAX2(gs->gs_num_invocations, 1);
        unsigned input_prim = gs->info.properties[TGSI_PROPERTY_GS_INPUT_PRIM];
        bool uses_adjacency = input_prim >= PIPE_PRIM_LINES_ADJACENCY &&
                              input_prim <= PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY;

        /* All these are in dwords: */
        /* We can't allow using the whole LDS, because GS waves compete with
         * other shader stages for LDS space. */
        const unsigned max_lds_size = 8 * 1024;
        const unsigned esgs_itemsize = es->esgs_itemsize / 4;
        unsigned esgs_lds_size;

        /* All these are per subgroup: */
        const unsigned max_out_prims = 32 * 1024;
        const unsigned max_es_verts = 255;
        const unsigned ideal_gs_prims = 64;
        unsigned max_gs_prims, gs_prims;
        unsigned min_es_verts, es_verts, worst_case_es_verts;

        assert(gs_num_invocations <= 32); /* GL maximum */

        if (uses_adjacency || gs_num_invocations > 1)
                max_gs_prims = 127 / gs_num_invocations;
        else
                max_gs_prims = 255;

        /* MAX_PRIMS_PER_SUBGROUP = gs_prims * max_vert_out * gs_invocations.
         * Make sure we don't go over the maximum value.
         */
        if (gs->gs_max_out_vertices > 0) {
                max_gs_prims = MIN2(max_gs_prims,
                                    max_out_prims /
                                    (gs->gs_max_out_vertices * gs_num_invocations));
        }
        assert(max_gs_prims > 0);

        /* If the primitive has adjacency, halve the number of vertices
         * that will be reused in multiple primitives.
         */
        min_es_verts = gs->gs_input_verts_per_prim / (uses_adjacency ? 2 : 1);

        gs_prims = MIN2(ideal_gs_prims, max_gs_prims);
        worst_case_es_verts = MIN2(min_es_verts * gs_prims, max_es_verts);

        /* Compute ESGS LDS size based on the worst case number of ES vertices
         * needed to create the target number of GS prims per subgroup.
         */
        esgs_lds_size = esgs_itemsize * worst_case_es_verts;

        /* If total LDS usage is too big, refactor partitions based on ratio
         * of ESGS item sizes.
         */
        if (esgs_lds_size > max_lds_size) {
                /* Our target GS Prims Per Subgroup was too large. Calculate
                 * the maximum number of GS Prims Per Subgroup that will fit
                 * into LDS, capped by the maximum that the hardware can support.
                 */
                gs_prims = MIN2((max_lds_size / (esgs_itemsize * min_es_verts)),
                                max_gs_prims);
                assert(gs_prims > 0);
                worst_case_es_verts = MIN2(min_es_verts * gs_prims,
                                           max_es_verts);

                esgs_lds_size = esgs_itemsize * worst_case_es_verts;
                assert(esgs_lds_size <= max_lds_size);
        }

        /* Now calculate remaining ESGS information. */
        if (esgs_lds_size)
                es_verts = MIN2(esgs_lds_size / esgs_itemsize, max_es_verts);
        else
                es_verts = max_es_verts;

        /* Vertices for adjacency primitives are not always reused, so restore
         * it for ES_VERTS_PER_SUBGRP.
         */
        min_es_verts = gs->gs_input_verts_per_prim;

        /* For normal primitives, the VGT only checks if they are past the ES
         * verts per subgroup after allocating a full GS primitive and if they
         * are, kick off a new subgroup.  But if those additional ES verts are
         * unique (e.g. not reused) we need to make sure there is enough LDS
         * space to account for those ES verts beyond ES_VERTS_PER_SUBGRP.
         */
        es_verts -= min_es_verts - 1;

        out->es_verts_per_subgroup = es_verts;
        out->gs_prims_per_subgroup = gs_prims;
        out->gs_inst_prims_in_subgroup = gs_prims * gs_num_invocations;
        out->max_prims_per_subgroup = out->gs_inst_prims_in_subgroup *
                                      gs->gs_max_out_vertices;
        out->lds_size = align(esgs_lds_size, 128) / 128;

        assert(out->max_prims_per_subgroup <= max_out_prims);
}

static void si_shader_gs(struct si_screen *sscreen, struct si_shader *shader)
{
        struct si_shader_selector *sel = shader->selector;
        const ubyte *num_components = sel->info.num_stream_output_components;
        unsigned gs_num_invocations = sel->gs_num_invocations;
        struct si_pm4_state *pm4;
        uint64_t va;
        unsigned max_stream = sel->max_gs_stream;
        unsigned offset;

        pm4 = si_get_shader_pm4_state(shader);
        if (!pm4)
                return;

        offset = num_components[0] * sel->gs_max_out_vertices;
        si_pm4_set_reg(pm4, R_028A60_VGT_GSVS_RING_OFFSET_1, offset);
        if (max_stream >= 1)
                offset += num_components[1] * sel->gs_max_out_vertices;
        si_pm4_set_reg(pm4, R_028A64_VGT_GSVS_RING_OFFSET_2, offset);
        if (max_stream >= 2)
                offset += num_components[2] * sel->gs_max_out_vertices;
        si_pm4_set_reg(pm4, R_028A68_VGT_GSVS_RING_OFFSET_3, offset);
        if (max_stream >= 3)
                offset += num_components[3] * sel->gs_max_out_vertices;
        si_pm4_set_reg(pm4, R_028AB0_VGT_GSVS_RING_ITEMSIZE, offset);

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

        si_pm4_set_reg(pm4, R_028B38_VGT_GS_MAX_VERT_OUT, sel->gs_max_out_vertices);

        si_pm4_set_reg(pm4, R_028B5C_VGT_GS_VERT_ITEMSIZE, num_components[0]);
        si_pm4_set_reg(pm4, R_028B60_VGT_GS_VERT_ITEMSIZE_1, (max_stream >= 1) ? num_components[1] : 0);
        si_pm4_set_reg(pm4, R_028B64_VGT_GS_VERT_ITEMSIZE_2, (max_stream >= 2) ? num_components[2] : 0);
        si_pm4_set_reg(pm4, R_028B68_VGT_GS_VERT_ITEMSIZE_3, (max_stream >= 3) ? num_components[3] : 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_SHADER_BINARY);

        if (sscreen->info.chip_class >= GFX9) {
                unsigned input_prim = sel->info.properties[TGSI_PROPERTY_GS_INPUT_PRIM];
                unsigned es_type = shader->key.part.gs.es->type;
                unsigned es_vgpr_comp_cnt, gs_vgpr_comp_cnt;
                struct gfx9_gs_info gs_info;

                if (es_type == PIPE_SHADER_VERTEX)
                        /* VGPR0-3: (VertexID, InstanceID / StepRate0, ...) */
                        es_vgpr_comp_cnt = shader->info.uses_instanceid ? 1 : 0;
                else if (es_type == PIPE_SHADER_TESS_EVAL)
                        es_vgpr_comp_cnt = shader->key.part.gs.es->info.uses_primid ? 3 : 2;
                else
                        unreachable("invalid shader selector type");

                /* If offsets 4, 5 are used, GS_VGPR_COMP_CNT is ignored and
                 * VGPR[0:4] are always loaded.
                 */
                if (sel->info.uses_invocationid)
                        gs_vgpr_comp_cnt = 3; /* VGPR3 contains InvocationID. */
                else if (sel->info.uses_primid)
                        gs_vgpr_comp_cnt = 2; /* VGPR2 contains PrimitiveID. */
                else if (input_prim >= PIPE_PRIM_TRIANGLES)
                        gs_vgpr_comp_cnt = 1; /* VGPR1 contains offsets 2, 3 */
                else
                        gs_vgpr_comp_cnt = 0; /* VGPR0 contains offsets 0, 1 */

                gfx9_get_gs_info(shader->key.part.gs.es, sel, &gs_info);

                si_pm4_set_reg(pm4, R_00B210_SPI_SHADER_PGM_LO_ES, va >> 8);
                si_pm4_set_reg(pm4, R_00B214_SPI_SHADER_PGM_HI_ES, 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) |
                               S_00B228_GS_VGPR_COMP_CNT(gs_vgpr_comp_cnt));
                si_pm4_set_reg(pm4, R_00B22C_SPI_SHADER_PGM_RSRC2_GS,
                               S_00B22C_USER_SGPR(GFX9_GS_NUM_USER_SGPR) |
                               S_00B22C_USER_SGPR_MSB(GFX9_GS_NUM_USER_SGPR >> 5) |
                               S_00B22C_ES_VGPR_COMP_CNT(es_vgpr_comp_cnt) |
                               S_00B22C_OC_LDS_EN(es_type == PIPE_SHADER_TESS_EVAL) |
                               S_00B22C_LDS_SIZE(gs_info.lds_size) |
                               S_00B22C_SCRATCH_EN(shader->config.scratch_bytes_per_wave > 0));

                si_pm4_set_reg(pm4, R_028A44_VGT_GS_ONCHIP_CNTL,
                               S_028A44_ES_VERTS_PER_SUBGRP(gs_info.es_verts_per_subgroup) |
                               S_028A44_GS_PRIMS_PER_SUBGRP(gs_info.gs_prims_per_subgroup) |
                               S_028A44_GS_INST_PRIMS_IN_SUBGRP(gs_info.gs_inst_prims_in_subgroup));
                si_pm4_set_reg(pm4, R_028A94_VGT_GS_MAX_PRIMS_PER_SUBGROUP,
                               S_028A94_MAX_PRIMS_PER_SUBGROUP(gs_info.max_prims_per_subgroup));
                si_pm4_set_reg(pm4, R_028AAC_VGT_ESGS_RING_ITEMSIZE,
                               shader->key.part.gs.es->esgs_itemsize / 4);

                if (es_type == PIPE_SHADER_TESS_EVAL)
                        si_set_tesseval_regs(sscreen, shader->key.part.gs.es, pm4);

                polaris_set_vgt_vertex_reuse(sscreen, shader->key.part.gs.es,
                                             NULL, pm4);
        } else {
                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(GFX6_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_selector *gs)
{
        const struct tgsi_shader_info *info = &shader->selector->info;
        struct si_pm4_state *pm4;
        unsigned num_user_sgprs;
        unsigned nparams, vgpr_comp_cnt;
        uint64_t va;
        unsigned oc_lds_en;
        unsigned window_space =
           info->properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION];
        bool enable_prim_id = shader->key.mono.u.vs_export_prim_id || info->uses_primid;

        pm4 = si_get_shader_pm4_state(shader);
        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) {
                unsigned mode = V_028A40_GS_OFF;

                /* PrimID needs GS scenario A. */
                if (enable_prim_id)
                        mode = V_028A40_GS_SCENARIO_A;

                si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE, S_028A40_MODE(mode));
                si_pm4_set_reg(pm4, R_028A84_VGT_PRIMITIVEID_EN, enable_prim_id);
        } else {
                si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE,
                               ac_vgt_gs_mode(gs->gs_max_out_vertices,
                                              sscreen->info.chip_class));
                si_pm4_set_reg(pm4, R_028A84_VGT_PRIMITIVEID_EN, 0);
        }

        if (sscreen->info.chip_class <= VI) {
                /* Reuse needs to be set off if we write oViewport. */
                si_pm4_set_reg(pm4, R_028AB4_VGT_REUSE_OFF,
                               S_028AB4_REUSE_OFF(info->writes_viewport_index));
        }

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

        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) {
                /* VGPR0-3: (VertexID, InstanceID / StepRate0, PrimID, InstanceID)
                 * If PrimID is disabled. InstanceID / StepRate1 is loaded instead.
                 * StepRate0 is set to 1. so that VGPR3 doesn't have to be loaded.
                 */
                vgpr_comp_cnt = enable_prim_id ? 2 : (shader->info.uses_instanceid ? 1 : 0);

                if (info->properties[TGSI_PROPERTY_VS_BLIT_SGPRS]) {
                        num_user_sgprs = SI_SGPR_VS_BLIT_DATA +
                                         info->properties[TGSI_PROPERTY_VS_BLIT_SGPRS];
                } else {
                        num_user_sgprs = SI_VS_NUM_USER_SGPR;
                }
        } else if (shader->selector->type == PIPE_SHADER_TESS_EVAL) {
                vgpr_comp_cnt = enable_prim_id ? 3 : 2;
                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->selector, pm4);

        polaris_set_vgt_vertex_reuse(sscreen, shader->selector, 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.part.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.part.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 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;
        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));
        /* POS_W_FLOAT_ENA requires one of the perspective weights. */
        assert(!G_0286CC_POS_W_FLOAT_ENA(input_ena) ||
               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));

        /* Validate interpolation optimization flags (read as implications). */
        assert(!shader->key.part.ps.prolog.bc_optimize_for_persp ||
               (G_0286CC_PERSP_CENTER_ENA(input_ena) &&
                G_0286CC_PERSP_CENTROID_ENA(input_ena)));
        assert(!shader->key.part.ps.prolog.bc_optimize_for_linear ||
               (G_0286CC_LINEAR_CENTER_ENA(input_ena) &&
                G_0286CC_LINEAR_CENTROID_ENA(input_ena)));
        assert(!shader->key.part.ps.prolog.force_persp_center_interp ||
               (!G_0286CC_PERSP_SAMPLE_ENA(input_ena) &&
                !G_0286CC_PERSP_CENTROID_ENA(input_ena)));
        assert(!shader->key.part.ps.prolog.force_linear_center_interp ||
               (!G_0286CC_LINEAR_SAMPLE_ENA(input_ena) &&
                !G_0286CC_LINEAR_CENTROID_ENA(input_ena)));
        assert(!shader->key.part.ps.prolog.force_persp_sample_interp ||
               (!G_0286CC_PERSP_CENTER_ENA(input_ena) &&
                !G_0286CC_PERSP_CENTROID_ENA(input_ena)));
        assert(!shader->key.part.ps.prolog.force_linear_sample_interp ||
               (!G_0286CC_LINEAR_CENTER_ENA(input_ena) &&
                !G_0286CC_LINEAR_CENTROID_ENA(input_ena)));

        /* Validate cases when the optimizations are off (read as implications). */
        assert(shader->key.part.ps.prolog.bc_optimize_for_persp ||
               !G_0286CC_PERSP_CENTER_ENA(input_ena) ||
               !G_0286CC_PERSP_CENTROID_ENA(input_ena));
        assert(shader->key.part.ps.prolog.bc_optimize_for_linear ||
               !G_0286CC_LINEAR_CENTER_ENA(input_ena) ||
               !G_0286CC_LINEAR_CENTROID_ENA(input_ena));

        pm4 = si_get_shader_pm4_state(shader);
        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 = ac_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. */
        spi_ps_in_control = S_0286D8_NUM_INTERP(si_get_ps_num_interp(shader));

        /* 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,
                       ac_get_spi_shader_z_format(info->writes_z,
                                                  info->writes_stencil,
                                                  info->writes_samplemask));

        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_SHADER_BINARY);
        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));
}

static void si_shader_init_pm4_state(struct si_screen *sscreen,
                                     struct si_shader *shader)
{
        switch (shader->selector->type) {
        case PIPE_SHADER_VERTEX:
                if (shader->key.as_ls)
                        si_shader_ls(sscreen, shader);
                else if (shader->key.as_es)
                        si_shader_es(sscreen, shader);
                else
                        si_shader_vs(sscreen, shader, NULL);
                break;
        case PIPE_SHADER_TESS_CTRL:
                si_shader_hs(sscreen, shader);
                break;
        case PIPE_SHADER_TESS_EVAL:
                if (shader->key.as_es)
                        si_shader_es(sscreen, shader);
                else
                        si_shader_vs(sscreen, shader, NULL);
                break;
        case PIPE_SHADER_GEOMETRY:
                si_shader_gs(sscreen, 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)
                return sctx->queued.named.dsa->alpha_func;

        return PIPE_FUNC_ALWAYS;
}

static void si_shader_selector_key_vs(struct si_context *sctx,
                                      struct si_shader_selector *vs,
                                      struct si_shader_key *key,
                                      struct si_vs_prolog_bits *prolog_key)
{
        if (!sctx->vertex_elements)
                return;

        prolog_key->instance_divisor_is_one =
                sctx->vertex_elements->instance_divisor_is_one;
        prolog_key->instance_divisor_is_fetched =
                sctx->vertex_elements->instance_divisor_is_fetched;

        /* Prefer a monolithic shader to allow scheduling divisions around
         * VBO loads. */
        if (prolog_key->instance_divisor_is_fetched)
                key->opt.prefer_mono = 1;

        unsigned count = MIN2(vs->info.num_inputs,
                              sctx->vertex_elements->count);
        memcpy(key->mono.vs_fix_fetch, sctx->vertex_elements->fix_fetch, count);
}

static void si_shader_selector_key_hw_vs(struct si_context *sctx,
                                         struct si_shader_selector *vs,
                                         struct si_shader_key *key)
{
        struct si_shader_selector *ps = sctx->ps_shader.cso;

        key->opt.clip_disable =
                sctx->queued.named.rasterizer->clip_plane_enable == 0 &&
                (vs->info.clipdist_writemask ||
                 vs->info.writes_clipvertex) &&
                !vs->info.culldist_writemask;

        /* Find out if PS is disabled. */
        bool ps_disabled = true;
        if (ps) {
                const struct si_state_blend *blend = sctx->queued.named.blend;
                bool alpha_to_coverage = blend && blend->alpha_to_coverage;
                bool ps_modifies_zs = ps->info.uses_kill ||
                                      ps->info.writes_z ||
                                      ps->info.writes_stencil ||
                                      ps->info.writes_samplemask ||
                                      alpha_to_coverage ||
                                      si_get_alpha_test_func(sctx) != PIPE_FUNC_ALWAYS;

                unsigned ps_colormask = sctx->framebuffer.colorbuf_enabled_4bit &
                                        sctx->queued.named.blend->cb_target_mask;
                if (!ps->info.properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS])
                        ps_colormask &= ps->colors_written_4bit;

                ps_disabled = sctx->queued.named.rasterizer->rasterizer_discard ||
                              (!ps_colormask &&
                               !ps_modifies_zs &&
                               !ps->info.writes_memory);
        }

        /* Find out which VS outputs aren't used by the PS. */
        uint64_t outputs_written = vs->outputs_written;
        uint64_t inputs_read = 0;

        /* ignore POSITION, PSIZE */
        outputs_written &= ~((1ull << si_shader_io_get_unique_index(TGSI_SEMANTIC_POSITION, 0) |
                             (1ull << si_shader_io_get_unique_index(TGSI_SEMANTIC_PSIZE, 0))));

        if (!ps_disabled) {
                inputs_read = ps->inputs_read;
        }

        uint64_t linked = outputs_written & inputs_read;

        key->opt.kill_outputs = ~linked & outputs_written;
}

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

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

        switch (sel->type) {
        case PIPE_SHADER_VERTEX:
                si_shader_selector_key_vs(sctx, sel, key, &key->part.vs.prolog);

                if (sctx->tes_shader.cso)
                        key->as_ls = 1;
                else if (sctx->gs_shader.cso)
                        key->as_es = 1;
                else {
                        si_shader_selector_key_hw_vs(sctx, sel, key);

                        if (sctx->ps_shader.cso && sctx->ps_shader.cso->info.uses_primid)
                                key->mono.u.vs_export_prim_id = 1;
                }
                break;
        case PIPE_SHADER_TESS_CTRL:
                if (sctx->b.chip_class >= GFX9) {
                        si_shader_selector_key_vs(sctx, sctx->vs_shader.cso,
                                                  key, &key->part.tcs.ls_prolog);
                        key->part.tcs.ls = sctx->vs_shader.cso;

                        /* When the LS VGPR fix is needed, monolithic shaders
                         * can:
                         *  - avoid initializing EXEC in both the LS prolog
                         *    and the LS main part when !vs_needs_prolog
                         *  - remove the fixup for unused input VGPRs
                         */
                        key->part.tcs.ls_prolog.ls_vgpr_fix = sctx->ls_vgpr_fix;

                        /* The LS output / HS input layout can be communicated
                         * directly instead of via user SGPRs for merged LS-HS.
                         * The LS VGPR fix prefers this too.
                         */
                        key->opt.prefer_mono = 1;
                }

                key->part.tcs.epilog.prim_mode =
                        sctx->tes_shader.cso->info.properties[TGSI_PROPERTY_TES_PRIM_MODE];
                key->part.tcs.epilog.invoc0_tess_factors_are_def =
                        sel->tcs_info.tessfactors_are_def_in_all_invocs;
                key->part.tcs.epilog.tes_reads_tess_factors =
                        sctx->tes_shader.cso->info.reads_tess_factors;

                if (sel == sctx->fixed_func_tcs_shader.cso)
                        key->mono.u.ff_tcs_inputs_to_copy = sctx->vs_shader.cso->outputs_written;
                break;
        case PIPE_SHADER_TESS_EVAL:
                if (sctx->gs_shader.cso)
                        key->as_es = 1;
                else {
                        si_shader_selector_key_hw_vs(sctx, sel, key);

                        if (sctx->ps_shader.cso && sctx->ps_shader.cso->info.uses_primid)
                                key->mono.u.vs_export_prim_id = 1;
                }
                break;
        case PIPE_SHADER_GEOMETRY:
                if (sctx->b.chip_class >= GFX9) {
                        if (sctx->tes_shader.cso) {
                                key->part.gs.es = sctx->tes_shader.cso;
                        } else {
                                si_shader_selector_key_vs(sctx, sctx->vs_shader.cso,
                                                          key, &key->part.gs.vs_prolog);
                                key->part.gs.es = sctx->vs_shader.cso;
                        }

                        /* Merged ES-GS can have unbalanced wave usage.
                         *
                         * ES threads are per-vertex, while GS threads are
                         * per-primitive. So without any amplification, there
                         * are fewer GS threads than ES threads, which can result
                         * in empty (no-op) GS waves. With too much amplification,
                         * there are more GS threads than ES threads, which
                         * can result in empty (no-op) ES waves.
                         *
                         * Non-monolithic shaders are implemented by setting EXEC
                         * at the beginning of shader parts, and don't jump to
                         * the end if EXEC is 0.
                         *
                         * Monolithic shaders use conditional blocks, so they can
                         * jump and skip empty waves of ES or GS. So set this to
                         * always use optimized variants, which are monolithic.
                         */
                        key->opt.prefer_mono = 1;
                }
                key->part.gs.prolog.tri_strip_adj_fix = sctx->gs_tri_strip_adj_fix;
                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->part.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->part.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);
                        key->part.ps.epilog.spi_shader_col_format &= blend->cb_target_enabled_4bit;

                        /* The output for dual source blending should have
                         * the same format as the first output.
                         */
                        if (blend->dual_src_blend)
                                key->part.ps.epilog.spi_shader_col_format |=
                                        (key->part.ps.epilog.spi_shader_col_format & 0xf) << 4;
                } else
                        key->part.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->part.ps.epilog.spi_shader_col_format & 0xf) &&
                    blend && blend->alpha_to_coverage)
                        key->part.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->part.ps.epilog.color_is_int8 = sctx->framebuffer.color_is_int8;
                        key->part.ps.epilog.color_is_int10 = sctx->framebuffer.color_is_int10;
                }

                /* Disable unwritten outputs (if WRITE_ALL_CBUFS isn't enabled). */
                if (!key->part.ps.epilog.last_cbuf) {
                        key->part.ps.epilog.spi_shader_col_format &= sel->colors_written_4bit;
                        key->part.ps.epilog.color_is_int8 &= sel->info.colors_written;
                        key->part.ps.epilog.color_is_int10 &= 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->part.ps.prolog.color_two_side = rs->two_side && sel->info.colors_read;
                        key->part.ps.prolog.flatshade_colors = rs->flatshade && sel->info.colors_read;

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

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

                        if (sctx->ps_iter_samples > 1 &&
                            sel->info.reads_samplemask) {
                                key->part.ps.prolog.samplemask_log_ps_iter =
                                        util_logbase2(util_next_power_of_two(sctx->ps_iter_samples));
                        }

                        if (rs->force_persample_interp &&
                            rs->multisample_enable &&
                            sctx->framebuffer.nr_samples > 1 &&
                            sctx->ps_iter_samples > 1) {
                                key->part.ps.prolog.force_persp_sample_interp =
                                        sel->info.uses_persp_center ||
                                        sel->info.uses_persp_centroid;

                                key->part.ps.prolog.force_linear_sample_interp =
                                        sel->info.uses_linear_center ||
                                        sel->info.uses_linear_centroid;
                        } else if (rs->multisample_enable &&
                                   sctx->framebuffer.nr_samples > 1) {
                                key->part.ps.prolog.bc_optimize_for_persp =
                                        sel->info.uses_persp_center &&
                                        sel->info.uses_persp_centroid;
                                key->part.ps.prolog.bc_optimize_for_linear =
                                        sel->info.uses_linear_center &&
                                        sel->info.uses_linear_centroid;
                        } else {
                                /* Make sure SPI doesn't compute more than 1 pair
                                 * of (i,j), which is the optimization here. */
                                key->part.ps.prolog.force_persp_center_interp =
                                        sel->info.uses_persp_center +
                                        sel->info.uses_persp_centroid +
                                        sel->info.uses_persp_sample > 1;

                                key->part.ps.prolog.force_linear_center_interp =
                                        sel->info.uses_linear_center +
                                        sel->info.uses_linear_centroid +
                                        sel->info.uses_linear_sample > 1;

                                if (sel->info.opcode_count[TGSI_OPCODE_INTERP_SAMPLE])
                                        key->mono.u.ps.interpolate_at_sample_force_center = 1;
                        }
                }

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

        if (unlikely(sctx->screen->debug_flags & DBG(NO_OPT_VARIANT)))
                memset(&key->opt, 0, sizeof(key->opt));
}

static void si_build_shader_variant(struct si_shader *shader,
                                    int thread_index,
                                    bool low_priority)
{
        struct si_shader_selector *sel = shader->selector;
        struct si_screen *sscreen = sel->screen;
        LLVMTargetMachineRef tm;
        struct pipe_debug_callback *debug = &shader->compiler_ctx_state.debug;
        int r;

        if (thread_index >= 0) {
                if (low_priority) {
                        assert(thread_index < ARRAY_SIZE(sscreen->tm_low_priority));
                        tm = sscreen->tm_low_priority[thread_index];
                } else {
                        assert(thread_index < ARRAY_SIZE(sscreen->tm));
                        tm = sscreen->tm[thread_index];
                }
                if (!debug->async)
                        debug = NULL;
        } else {
                assert(!low_priority);
                tm = shader->compiler_ctx_state.tm;
        }

        r = si_shader_create(sscreen, tm, shader, debug);
        if (unlikely(r)) {
                R600_ERR("Failed to build shader variant (type=%u) %d\n",
                         sel->type, r);
                shader->compilation_failed = true;
                return;
        }

        if (shader->compiler_ctx_state.is_debug_context) {
                FILE *f = open_memstream(&shader->shader_log,
                                         &shader->shader_log_size);
                if (f) {
                        si_shader_dump(sscreen, shader, NULL, sel->type, f, false);
                        fclose(f);
                }
        }

        si_shader_init_pm4_state(sscreen, shader);
}

static void si_build_shader_variant_low_priority(void *job, int thread_index)
{
        struct si_shader *shader = (struct si_shader *)job;

        assert(thread_index >= 0);

        si_build_shader_variant(shader, thread_index, true);
}

static const struct si_shader_key zeroed;

static bool si_check_missing_main_part(struct si_screen *sscreen,
                                       struct si_shader_selector *sel,
                                       struct si_compiler_ctx_state *compiler_state,
                                       struct si_shader_key *key)
{
        struct si_shader **mainp = si_get_main_shader_part(sel, key);

        if (!*mainp) {
                struct si_shader *main_part = CALLOC_STRUCT(si_shader);

                if (!main_part)
                        return false;

                /* We can leave the fence as permanently signaled because the
                 * main part becomes visible globally only after it has been
                 * compiled. */
                util_queue_fence_init(&main_part->ready);

                main_part->selector = sel;
                main_part->key.as_es = key->as_es;
                main_part->key.as_ls = key->as_ls;

                if (si_compile_tgsi_shader(sscreen, compiler_state->tm,
                                           main_part, false,
                                           &compiler_state->debug) != 0) {
                        FREE(main_part);
                        return false;
                }
                *mainp = main_part;
        }
        return true;
}

/* Select the hw shader variant depending on the current state. */
static int si_shader_select_with_key(struct si_screen *sscreen,
                                     struct si_shader_ctx_state *state,
                                     struct si_compiler_ctx_state *compiler_state,
                                     struct si_shader_key *key,
                                     int thread_index)
{
        struct si_shader_selector *sel = state->cso;
        struct si_shader_selector *previous_stage_sel = NULL;
        struct si_shader *current = state->current;
        struct si_shader *iter, *shader = NULL;

again:
        /* 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)) {
                if (unlikely(!util_queue_fence_is_signalled(&current->ready))) {
                        if (current->is_optimized) {
                                memset(&key->opt, 0, sizeof(key->opt));
                                goto current_not_ready;
                        }

                        util_queue_fence_wait(&current->ready);
                }

                return current->compilation_failed ? -1 : 0;
        }
current_not_ready:

        /* This must be done before the mutex is locked, because async GS
         * compilation calls this function too, and therefore must enter
         * the mutex first.
         *
         * Only wait if we are in a draw call. Don't wait if we are
         * in a compiler thread.
         */
        if (thread_index < 0)
                util_queue_fence_wait(&sel->ready);

        mtx_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) {
                        mtx_unlock(&sel->mutex);

                        if (unlikely(!util_queue_fence_is_signalled(&iter->ready))) {
                                /* If it's an optimized shader and its compilation has
                                 * been started but isn't done, use the unoptimized
                                 * shader so as not to cause a stall due to compilation.
                                 */
                                if (iter->is_optimized) {
                                        memset(&key->opt, 0, sizeof(key->opt));
                                        goto again;
                                }

                                util_queue_fence_wait(&iter->ready);
                        }

                        if (iter->compilation_failed) {
                                return -1; /* skip the draw call */
                        }

                        state->current = iter;
                        return 0;
                }
        }

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

        util_queue_fence_init(&shader->ready);

        shader->selector = sel;
        shader->key = *key;
        shader->compiler_ctx_state = *compiler_state;

        /* If this is a merged shader, get the first shader's selector. */
        if (sscreen->info.chip_class >= GFX9) {
                if (sel->type == PIPE_SHADER_TESS_CTRL)
                        previous_stage_sel = key->part.tcs.ls;
                else if (sel->type == PIPE_SHADER_GEOMETRY)
                        previous_stage_sel = key->part.gs.es;

                /* We need to wait for the previous shader. */
                if (previous_stage_sel && thread_index < 0)
                        util_queue_fence_wait(&previous_stage_sel->ready);
        }

        /* Compile the main shader part if it doesn't exist. This can happen
         * if the initial guess was wrong. */
        bool is_pure_monolithic =
                sscreen->use_monolithic_shaders ||
                memcmp(&key->mono, &zeroed.mono, sizeof(key->mono)) != 0;

        if (!is_pure_monolithic) {
                bool ok;

                /* Make sure the main shader part is present. This is needed
                 * for shaders that can be compiled as VS, LS, or ES, and only
                 * one of them is compiled at creation.
                 *
                 * For merged shaders, check that the starting shader's main
                 * part is present.
                 */
                if (previous_stage_sel) {
                        struct si_shader_key shader1_key = zeroed;

                        if (sel->type == PIPE_SHADER_TESS_CTRL)
                                shader1_key.as_ls = 1;
                        else if (sel->type == PIPE_SHADER_GEOMETRY)
                                shader1_key.as_es = 1;
                        else
                                assert(0);

                        mtx_lock(&previous_stage_sel->mutex);
                        ok = si_check_missing_main_part(sscreen,
                                                        previous_stage_sel,
                                                        compiler_state, &shader1_key);
                        mtx_unlock(&previous_stage_sel->mutex);
                } else {
                        ok = si_check_missing_main_part(sscreen, sel,
                                                        compiler_state, key);
                }
                if (!ok) {
                        FREE(shader);
                        mtx_unlock(&sel->mutex);
                        return -ENOMEM; /* skip the draw call */
                }
        }

        /* Keep the reference to the 1st shader of merged shaders, so that
         * Gallium can't destroy it before we destroy the 2nd shader.
         *
         * Set sctx = NULL, because it's unused if we're not releasing
         * the shader, and we don't have any sctx here.
         */
        si_shader_selector_reference(NULL, &shader->previous_stage_sel,
                                     previous_stage_sel);

        /* Monolithic-only shaders don't make a distinction between optimized
         * and unoptimized. */
        shader->is_monolithic =
                is_pure_monolithic ||
                memcmp(&key->opt, &zeroed.opt, sizeof(key->opt)) != 0;

        shader->is_optimized =
                !is_pure_monolithic &&
                memcmp(&key->opt, &zeroed.opt, sizeof(key->opt)) != 0;

        /* If it's an optimized shader, compile it asynchronously. */
        if (shader->is_optimized &&
            !is_pure_monolithic &&
            thread_index < 0) {
                /* Compile it asynchronously. */
                util_queue_add_job(&sscreen->shader_compiler_queue_low_priority,
                                   shader, &shader->ready,
                                   si_build_shader_variant_low_priority, NULL);

                /* Add only after the ready fence was reset, to guard against a
                 * race with si_bind_XX_shader. */
                if (!sel->last_variant) {
                        sel->first_variant = shader;
                        sel->last_variant = shader;
                } else {
                        sel->last_variant->next_variant = shader;
                        sel->last_variant = shader;
                }

                /* Use the default (unoptimized) shader for now. */
                memset(&key->opt, 0, sizeof(key->opt));
                mtx_unlock(&sel->mutex);
                goto again;
        }

        /* Reset the fence before adding to the variant list. */
        util_queue_fence_reset(&shader->ready);

        if (!sel->last_variant) {
                sel->first_variant = shader;
                sel->last_variant = shader;
        } else {
                sel->last_variant->next_variant = shader;
                sel->last_variant = shader;
        }

        mtx_unlock(&sel->mutex);

        assert(!shader->is_optimized);
        si_build_shader_variant(shader, thread_index, false);

        util_queue_fence_signal(&shader->ready);

        if (!shader->compilation_failed)
                state->current = shader;

        return shader->compilation_failed ? -1 : 0;
}

static int si_shader_select(struct pipe_context *ctx,
                            struct si_shader_ctx_state *state,
                            struct si_compiler_ctx_state *compiler_state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_key key;

        si_shader_selector_key(ctx, state->cso, &key);
        return si_shader_select_with_key(sctx->screen, state, compiler_state,
                                         &key, -1);
}

static void si_parse_next_shader_property(const struct tgsi_shader_info *info,
                                          bool streamout,
                                          struct 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->as_es = 1;
                        break;
                case PIPE_SHADER_TESS_CTRL:
                case PIPE_SHADER_TESS_EVAL:
                        key->as_ls = 1;
                        break;
                default:
                        /* If POSITION isn't written, it can only be a HW VS
                         * if streamout is used. If streamout isn't used,
                         * assume that it's a HW LS. (the next shader is TCS)
                         * This heuristic is needed for separate shader objects.
                         */
                        if (!info->writes_position && !streamout)
                                key->as_ls = 1;
                }
                break;

        case PIPE_SHADER_TESS_EVAL:
                if (next_shader == PIPE_SHADER_GEOMETRY ||
                    !info->writes_position)
                        key->as_es = 1;
                break;
        }
}

/**
 * Compile the main shader part or the monolithic shader as part of
 * si_shader_selector initialization. Since it can be done asynchronously,
 * there is no way to report compile failures to applications.
 */
static void si_init_shader_selector_async(void *job, int thread_index)
{
        struct si_shader_selector *sel = (struct si_shader_selector *)job;
        struct si_screen *sscreen = sel->screen;
        LLVMTargetMachineRef tm;
        struct pipe_debug_callback *debug = &sel->compiler_ctx_state.debug;

        assert(!debug->debug_message || debug->async);
        assert(thread_index >= 0);
        assert(thread_index < ARRAY_SIZE(sscreen->tm));
        tm = sscreen->tm[thread_index];

        /* Compile the main shader part for use with a prolog and/or epilog.
         * If this fails, the driver will try to compile a monolithic shader
         * on demand.
         */
        if (!sscreen->use_monolithic_shaders) {
                struct si_shader *shader = CALLOC_STRUCT(si_shader);
                void *tgsi_binary = NULL;

                if (!shader) {
                        fprintf(stderr, "radeonsi: can't allocate a main shader part\n");
                        return;
                }

                /* We can leave the fence signaled because use of the default
                 * main part is guarded by the selector's ready fence. */
                util_queue_fence_init(&shader->ready);

                shader->selector = sel;
                si_parse_next_shader_property(&sel->info,
                                              sel->so.num_outputs != 0,
                                              &shader->key);

                if (sel->tokens)
                        tgsi_binary = si_get_tgsi_binary(sel);

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

                if (tgsi_binary &&
                    si_shader_cache_load_shader(sscreen, tgsi_binary, shader)) {
                        mtx_unlock(&sscreen->shader_cache_mutex);
                        si_shader_dump_stats_for_shader_db(shader, debug);
                } else {
                        mtx_unlock(&sscreen->shader_cache_mutex);

                        /* Compile the shader if it hasn't been loaded from the cache. */
                        if (si_compile_tgsi_shader(sscreen, tm, shader, false,
                                                   debug) != 0) {
                                FREE(shader);
                                FREE(tgsi_binary);
                                fprintf(stderr, "radeonsi: can't compile a main shader part\n");
                                return;
                        }

                        if (tgsi_binary) {
                                mtx_lock(&sscreen->shader_cache_mutex);
                                if (!si_shader_cache_insert_shader(sscreen, tgsi_binary, shader, true))
                                        FREE(tgsi_binary);
                                mtx_unlock(&sscreen->shader_cache_mutex);
                        }
                }

                *si_get_main_shader_part(sel, &shader->key) = shader;

                /* Unset "outputs_written" flags for outputs converted to
                 * DEFAULT_VAL, so that later inter-shader optimizations don't
                 * try to eliminate outputs that don't exist in the final
                 * shader.
                 *
                 * This is only done if non-monolithic shaders are enabled.
                 */
                if ((sel->type == PIPE_SHADER_VERTEX ||
                     sel->type == PIPE_SHADER_TESS_EVAL) &&
                    !shader->key.as_ls &&
                    !shader->key.as_es) {
                        unsigned i;

                        for (i = 0; i < sel->info.num_outputs; i++) {
                                unsigned offset = shader->info.vs_output_param_offset[i];

                                if (offset <= AC_EXP_PARAM_OFFSET_31)
                                        continue;

                                unsigned name = sel->info.output_semantic_name[i];
                                unsigned index = sel->info.output_semantic_index[i];
                                unsigned id;

                                switch (name) {
                                case TGSI_SEMANTIC_GENERIC:
                                        /* don't process indices the function can't handle */
                                        if (index >= SI_MAX_IO_GENERIC)
                                                break;
                                        /* fall through */
                                default:
                                        id = si_shader_io_get_unique_index(name, index);
                                        sel->outputs_written &= ~(1ull << id);
                                        break;
                                case TGSI_SEMANTIC_POSITION: /* ignore these */
                                case TGSI_SEMANTIC_PSIZE:
                                case TGSI_SEMANTIC_CLIPVERTEX:
                                case TGSI_SEMANTIC_EDGEFLAG:
                                        break;
                                }
                        }
                }
        }

        /* The GS copy shader is always pre-compiled. */
        if (sel->type == PIPE_SHADER_GEOMETRY) {
                sel->gs_copy_shader = si_generate_gs_copy_shader(sscreen, tm, sel, debug);
                if (!sel->gs_copy_shader) {
                        fprintf(stderr, "radeonsi: can't create GS copy shader\n");
                        return;
                }

                si_shader_vs(sscreen, sel->gs_copy_shader, sel);
        }
}

/* Return descriptor slot usage masks from the given shader info. */
void si_get_active_slot_masks(const struct tgsi_shader_info *info,
                              uint32_t *const_and_shader_buffers,
                              uint64_t *samplers_and_images)
{
        unsigned start, num_shaderbufs, num_constbufs, num_images, num_samplers;

        num_shaderbufs = util_last_bit(info->shader_buffers_declared);
        num_constbufs = util_last_bit(info->const_buffers_declared);
        /* two 8-byte images share one 16-byte slot */
        num_images = align(util_last_bit(info->images_declared), 2);
        num_samplers = util_last_bit(info->samplers_declared);

        /* The layout is: sb[last] ... sb[0], cb[0] ... cb[last] */
        start = si_get_shaderbuf_slot(num_shaderbufs - 1);
        *const_and_shader_buffers =
                u_bit_consecutive(start, num_shaderbufs + num_constbufs);

        /* The layout is: image[last] ... image[0], sampler[0] ... sampler[last] */
        start = si_get_image_slot(num_images - 1) / 2;
        *samplers_and_images =
                u_bit_consecutive64(start, num_images / 2 + num_samplers);
}

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;

        pipe_reference_init(&sel->reference, 1);
        sel->screen = sscreen;
        sel->compiler_ctx_state.debug = sctx->debug;
        sel->compiler_ctx_state.is_debug_context = sctx->is_debug;

        sel->so = state->stream_output;

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

                tgsi_scan_shader(state->tokens, &sel->info);
                tgsi_scan_tess_ctrl(state->tokens, &sel->info, &sel->tcs_info);
        } else {
                assert(state->type == PIPE_SHADER_IR_NIR);

                sel->nir = state->ir.nir;

                si_nir_scan_shader(sel->nir, &sel->info);
                si_nir_scan_tess_ctrl(sel->nir, &sel->info, &sel->tcs_info);

                si_lower_nir(sel);
        }

        sel->type = sel->info.processor;
        p_atomic_inc(&sscreen->num_shaders_created);
        si_get_active_slot_masks(&sel->info,
                                 &sel->active_const_and_shader_buffers,
                                 &sel->active_samplers_and_images);

        /* Record which streamout buffers are enabled. */
        for (i = 0; i < sel->so.num_outputs; i++) {
                sel->enabled_streamout_buffer_mask |=
                        (1 << sel->so.output[i].output_buffer) <<
                        (sel->so.output[i].stream * 4);
        }

        /* The prolog is a no-op if there are no inputs. */
        sel->vs_needs_prolog = sel->type == PIPE_SHADER_VERTEX &&
                               sel->info.num_inputs &&
                               !sel->info.properties[TGSI_PROPERTY_VS_BLIT_SGPRS];

        sel->force_correct_derivs_after_kill =
                sel->type == PIPE_SHADER_FRAGMENT &&
                sel->info.uses_derivatives &&
                sel->info.uses_kill &&
                sctx->screen->debug_flags & DBG(FS_CORRECT_DERIVS_AFTER_KILL);

        /* 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 |=
                        (1ull << si_shader_io_get_unique_index_patch(TGSI_SEMANTIC_TESSINNER, 0)) |
                        (1ull << si_shader_io_get_unique_index_patch(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 |=
                                        1ull << si_shader_io_get_unique_index_patch(name, index);
                                break;

                        case TGSI_SEMANTIC_GENERIC:
                                /* don't process indices the function can't handle */
                                if (index >= SI_MAX_IO_GENERIC)
                                        break;
                                /* fall through */
                        default:
                                sel->outputs_written |=
                                        1ull << si_shader_io_get_unique_index(name, index);
                                break;
                        case TGSI_SEMANTIC_CLIPVERTEX: /* ignore these */
                        case TGSI_SEMANTIC_EDGEFLAG:
                                break;
                        }
                }
                sel->esgs_itemsize = util_last_bit64(sel->outputs_written) * 16;

                /* For the ESGS ring in LDS, add 1 dword to reduce LDS bank
                 * conflicts, i.e. each vertex will start at a different bank.
                 */
                if (sctx->b.chip_class >= GFX9)
                        sel->esgs_itemsize += 4;
                break;

        case PIPE_SHADER_FRAGMENT:
                for (i = 0; i < sel->info.num_inputs; i++) {
                        unsigned name = sel->info.input_semantic_name[i];
                        unsigned index = sel->info.input_semantic_index[i];

                        switch (name) {
                        case TGSI_SEMANTIC_GENERIC:
                                /* don't process indices the function can't handle */
                                if (index >= SI_MAX_IO_GENERIC)
                                        break;
                                /* fall through */
                        default:
                                sel->inputs_read |=
                                        1ull << si_shader_io_get_unique_index(name, index);
                                break;
                        case TGSI_SEMANTIC_PCOORD: /* ignore this */
                                break;
                        }
                }

                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;
        }

        /* PA_CL_VS_OUT_CNTL */
        bool misc_vec_ena =
                sel->info.writes_psize || sel->info.writes_edgeflag ||
                sel->info.writes_layer || sel->info.writes_viewport_index;
        sel->pa_cl_vs_out_cntl =
                S_02881C_USE_VTX_POINT_SIZE(sel->info.writes_psize) |
                S_02881C_USE_VTX_EDGE_FLAG(sel->info.writes_edgeflag) |
                S_02881C_USE_VTX_RENDER_TARGET_INDX(sel->info.writes_layer) |
                S_02881C_USE_VTX_VIEWPORT_INDX(sel->info.writes_viewport_index) |
                S_02881C_VS_OUT_MISC_VEC_ENA(misc_vec_ena) |
                S_02881C_VS_OUT_MISC_SIDE_BUS_ENA(misc_vec_ena);
        sel->clipdist_mask = sel->info.writes_clipvertex ?
                                     SIX_BITS : sel->info.clipdist_writemask;
        sel->culldist_mask = sel->info.culldist_writemask <<
                             sel->info.num_written_clipdistance;

        /* 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;
        }

        /* Z_ORDER, EXEC_ON_HIER_FAIL and EXEC_ON_NOOP should be set as following:
         *
         *   | early Z/S | writes_mem | allow_ReZ? |      Z_ORDER       | EXEC_ON_HIER_FAIL | EXEC_ON_NOOP
         * --|-----------|------------|------------|--------------------|-------------------|-------------
         * 1a|   false   |   false    |   true     | EarlyZ_Then_ReZ    |         0         |     0
         * 1b|   false   |   false    |   false    | EarlyZ_Then_LateZ  |         0         |     0
         * 2 |   false   |   true     |   n/a      |       LateZ        |         1         |     0
         * 3 |   true    |   false    |   n/a      | EarlyZ_Then_LateZ  |         0         |     0
         * 4 |   true    |   true     |   n/a      | EarlyZ_Then_LateZ  |         0         |     1
         *
         * In cases 3 and 4, HW will force Z_ORDER to EarlyZ regardless of what's set in the register.
         * In case 2, NOOP_CULL is a don't care field. In case 2, 3 and 4, ReZ doesn't make sense.
         *
         * Don't use ReZ without profiling !!!
         *
         * ReZ decreases performance by 15% in DiRT: Showdown on Ultra settings, which has pretty complex
         * shaders.
         */
        if (sel->info.properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL]) {
                /* Cases 3, 4. */
                sel->db_shader_control |= S_02880C_DEPTH_BEFORE_SHADER(1) |
                                          S_02880C_Z_ORDER(V_02880C_EARLY_Z_THEN_LATE_Z) |
                                          S_02880C_EXEC_ON_NOOP(sel->info.writes_memory);
        } else if (sel->info.writes_memory) {
                /* Case 2. */
                sel->db_shader_control |= S_02880C_Z_ORDER(V_02880C_LATE_Z) |
                                          S_02880C_EXEC_ON_HIER_FAIL(1);
        } else {
                /* Case 1. */
                sel->db_shader_control |= S_02880C_Z_ORDER(V_02880C_EARLY_Z_THEN_LATE_Z);
        }

        (void) mtx_init(&sel->mutex, mtx_plain);
        util_queue_fence_init(&sel->ready);

        struct util_async_debug_callback async_debug;
        bool wait =
                (sctx->debug.debug_message && !sctx->debug.async) ||
                sctx->is_debug ||
                si_can_dump_shader(sscreen, sel->info.processor);

        if (wait) {
                u_async_debug_init(&async_debug);
                sel->compiler_ctx_state.debug = async_debug.base;
        }

        util_queue_add_job(&sscreen->shader_compiler_queue, sel,
                           &sel->ready, si_init_shader_selector_async,
                           NULL);

        if (wait) {
                util_queue_fence_wait(&sel->ready);
                u_async_debug_drain(&async_debug, &sctx->debug);
                u_async_debug_cleanup(&async_debug);
        }

        return sel;
}

static void si_update_streamout_state(struct si_context *sctx)
{
        struct si_shader_selector *shader_with_so = si_get_vs(sctx)->cso;

        if (!shader_with_so)
                return;

        sctx->streamout.enabled_stream_buffers_mask =
                shader_with_so->enabled_streamout_buffer_mask;
        sctx->streamout.stride_in_dw = shader_with_so->so.stride;
}

static void si_update_clip_regs(struct si_context *sctx,
                                struct si_shader_selector *old_hw_vs,
                                struct si_shader *old_hw_vs_variant,
                                struct si_shader_selector *next_hw_vs,
                                struct si_shader *next_hw_vs_variant)
{
        if (next_hw_vs &&
            (!old_hw_vs ||
             old_hw_vs->info.properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION] !=
             next_hw_vs->info.properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION] ||
             old_hw_vs->pa_cl_vs_out_cntl != next_hw_vs->pa_cl_vs_out_cntl ||
             old_hw_vs->clipdist_mask != next_hw_vs->clipdist_mask ||
             old_hw_vs->culldist_mask != next_hw_vs->culldist_mask ||
             !old_hw_vs_variant ||
             !next_hw_vs_variant ||
             old_hw_vs_variant->key.opt.clip_disable !=
             next_hw_vs_variant->key.opt.clip_disable))
                si_mark_atom_dirty(sctx, &sctx->clip_regs);
}

static void si_update_common_shader_state(struct si_context *sctx)
{
        sctx->uses_bindless_samplers =
                si_shader_uses_bindless_samplers(sctx->vs_shader.cso)  ||
                si_shader_uses_bindless_samplers(sctx->gs_shader.cso)  ||
                si_shader_uses_bindless_samplers(sctx->ps_shader.cso)  ||
                si_shader_uses_bindless_samplers(sctx->tcs_shader.cso) ||
                si_shader_uses_bindless_samplers(sctx->tes_shader.cso);
        sctx->uses_bindless_images =
                si_shader_uses_bindless_images(sctx->vs_shader.cso)  ||
                si_shader_uses_bindless_images(sctx->gs_shader.cso)  ||
                si_shader_uses_bindless_images(sctx->ps_shader.cso)  ||
                si_shader_uses_bindless_images(sctx->tcs_shader.cso) ||
                si_shader_uses_bindless_images(sctx->tes_shader.cso);
        sctx->do_update_shaders = true;
}

static void si_bind_vs_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *old_hw_vs = si_get_vs(sctx)->cso;
        struct si_shader *old_hw_vs_variant = si_get_vs_state(sctx);
        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;
        sctx->num_vs_blit_sgprs = sel ? sel->info.properties[TGSI_PROPERTY_VS_BLIT_SGPRS] : 0;

        si_update_common_shader_state(sctx);
        si_update_vs_viewport_state(sctx);
        si_set_active_descriptors_for_shader(sctx, sel);
        si_update_streamout_state(sctx);
        si_update_clip_regs(sctx, old_hw_vs, old_hw_vs_variant,
                            si_get_vs(sctx)->cso, si_get_vs_state(sctx));
}

static void si_update_tess_uses_prim_id(struct si_context *sctx)
{
        sctx->ia_multi_vgt_param_key.u.tess_uses_prim_id =
                (sctx->tes_shader.cso &&
                 sctx->tes_shader.cso->info.uses_primid) ||
                (sctx->tcs_shader.cso &&
                 sctx->tcs_shader.cso->info.uses_primid) ||
                (sctx->gs_shader.cso &&
                 sctx->gs_shader.cso->info.uses_primid) ||
                (sctx->ps_shader.cso && !sctx->gs_shader.cso &&
                 sctx->ps_shader.cso->info.uses_primid);
}

static void si_bind_gs_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *old_hw_vs = si_get_vs(sctx)->cso;
        struct si_shader *old_hw_vs_variant = si_get_vs_state(sctx);
        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;
        sctx->ia_multi_vgt_param_key.u.uses_gs = sel != NULL;

        si_update_common_shader_state(sctx);
        sctx->last_rast_prim = -1; /* reset this so that it gets updated */

        if (enable_changed) {
                si_shader_change_notify(sctx);
                if (sctx->ia_multi_vgt_param_key.u.uses_tess)
                        si_update_tess_uses_prim_id(sctx);
        }
        si_update_vs_viewport_state(sctx);
        si_set_active_descriptors_for_shader(sctx, sel);
        si_update_streamout_state(sctx);
        si_update_clip_regs(sctx, old_hw_vs, old_hw_vs_variant,
                            si_get_vs(sctx)->cso, si_get_vs_state(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;
        si_update_tess_uses_prim_id(sctx);

        si_update_common_shader_state(sctx);

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

        si_set_active_descriptors_for_shader(sctx, sel);
}

static void si_bind_tes_shader(struct pipe_context *ctx, void *state)
{
        struct si_context *sctx = (struct si_context *)ctx;
        struct si_shader_selector *old_hw_vs = si_get_vs(sctx)->cso;
        struct si_shader *old_hw_vs_variant = si_get_vs_state(sctx);
        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;
        sctx->ia_multi_vgt_param_key.u.uses_tess = sel != NULL;
        si_update_tess_uses_prim_id(sctx);

        si_update_common_shader_state(sctx);
        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 */
        }
        si_update_vs_viewport_state(sctx);
        si_set_active_descriptors_for_shader(sctx, sel);
        si_update_streamout_state(sctx);
        si_update_clip_regs(sctx, old_hw_vs, old_hw_vs_variant,
                            si_get_vs(sctx)->cso, si_get_vs_state(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 *old_sel = sctx->ps_shader.cso;
        struct si_shader_selector *sel = state;

        /* skip if supplied shader is one already in use */
        if (old_sel == sel)
                return;

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

        si_update_common_shader_state(sctx);
        if (sel) {
                if (sctx->ia_multi_vgt_param_key.u.uses_tess)
                        si_update_tess_uses_prim_id(sctx);

                if (!old_sel ||
                    old_sel->info.colors_written != sel->info.colors_written)
                        si_mark_atom_dirty(sctx, &sctx->cb_render_state);

                if (sctx->screen->has_out_of_order_rast &&
                    (!old_sel ||
                     old_sel->info.writes_memory != sel->info.writes_memory ||
                     old_sel->info.properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL] !=
                     sel->info.properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL]))
                        si_mark_atom_dirty(sctx, &sctx->msaa_config);
        }
        si_set_active_descriptors_for_shader(sctx, sel);
}

static void si_delete_shader(struct si_context *sctx, struct si_shader *shader)
{
        if (shader->is_optimized) {
                util_queue_drop_job(&sctx->screen->shader_compiler_queue_low_priority,
                                    &shader->ready);
        }

        util_queue_fence_destroy(&shader->ready);

        if (shader->pm4) {
                switch (shader->selector->type) {
                case PIPE_SHADER_VERTEX:
                        if (shader->key.as_ls) {
                                assert(sctx->b.chip_class <= VI);
                                si_pm4_delete_state(sctx, ls, shader->pm4);
                        } else if (shader->key.as_es) {
                                assert(sctx->b.chip_class <= VI);
                                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.as_es) {
                                assert(sctx->b.chip_class <= VI);
                                si_pm4_delete_state(sctx, es, shader->pm4);
                        } else {
                                si_pm4_delete_state(sctx, vs, shader->pm4);
                        }
                        break;
                case PIPE_SHADER_GEOMETRY:
                        if (shader->is_gs_copy_shader)
                                si_pm4_delete_state(sctx, vs, shader->pm4);
                        else
                                si_pm4_delete_state(sctx, gs, shader->pm4);
                        break;
                case PIPE_SHADER_FRAGMENT:
                        si_pm4_delete_state(sctx, ps, shader->pm4);
                        break;
                }
        }

        si_shader_selector_reference(sctx, &shader->previous_stage_sel, NULL);
        si_shader_destroy(shader);
        free(shader);
}

void si_destroy_shader_selector(struct si_context *sctx,
                                struct si_shader_selector *sel)
{
        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,
        };

        util_queue_drop_job(&sctx->screen->shader_compiler_queue, &sel->ready);

        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);
        if (sel->main_shader_part_ls)
                si_delete_shader(sctx, sel->main_shader_part_ls);
        if (sel->main_shader_part_es)
                si_delete_shader(sctx, sel->main_shader_part_es);
        if (sel->gs_copy_shader)
                si_delete_shader(sctx, sel->gs_copy_shader);

        util_queue_fence_destroy(&sel->ready);
        mtx_destroy(&sel->mutex);
        free(sel->tokens);
        ralloc_free(sel->nir);
        free(sel);
}

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;

        si_shader_selector_reference(sctx, &sel, NULL);
}

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, offset, 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]) {
                        offset = vs->info.vs_output_param_offset[j];

                        if (offset <= AC_EXP_PARAM_OFFSET_31) {
                                /* The input is loaded from parameter memory. */
                                ps_input_cntl |= S_028644_OFFSET(offset);
                        } else if (!G_028644_PT_SPRITE_TEX(ps_input_cntl)) {
                                if (offset == AC_EXP_PARAM_UNDEFINED) {
                                        /* This can happen with depth-only rendering. */
                                        offset = 0;
                                } else {
                                        /* The input is a DEFAULT_VAL constant. */
                                        assert(offset >= AC_EXP_PARAM_DEFAULT_VAL_0000 &&
                                               offset <= AC_EXP_PARAM_DEFAULT_VAL_1111);
                                        offset -= AC_EXP_PARAM_DEFAULT_VAL_0000;
                                }

                                ps_input_cntl = S_028644_OFFSET(0x20) |
                                                S_028644_DEFAULT_VAL(offset);
                        }
                        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.part.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;

        /* Done by Vulkan before VGT_FLUSH. */
        si_pm4_cmd_begin(sctx->init_config, PKT3_EVENT_WRITE);
        si_pm4_cmd_add(sctx->init_config,
                       EVENT_TYPE(V_028A90_VS_PARTIAL_FLUSH) | EVENT_INDEX(4));
        si_pm4_cmd_end(sctx->init_config, false);

        /* 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->info.max_se;
        unsigned wave_size = 64;
        unsigned max_gs_waves = 32 * num_se; /* max 32 per SE on GCN */
        /* On SI-CI, the value comes from VGT_GS_VERTEX_REUSE = 16.
         * On VI+, the value comes from VGT_VERTEX_REUSE_BLOCK_CNTL = 30 (+2).
         */
        unsigned gs_vertex_reuse = (sctx->b.chip_class >= VI ? 32 : 16) * num_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;

        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)
         *
         * GFX9 doesn't have the ESGS ring.
         */
        bool update_esgs = sctx->b.chip_class <= VI &&
                           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 =
                        si_aligned_buffer_create(sctx->b.b.screen,
                                                   R600_RESOURCE_FLAG_UNMAPPABLE,
                                                   PIPE_USAGE_DEFAULT,
                                                   esgs_ring_size, alignment);
                if (!sctx->esgs_ring)
                        return false;
        }

        if (update_gsvs) {
                pipe_resource_reference(&sctx->gsvs_ring, NULL);
                sctx->gsvs_ring =
                        si_aligned_buffer_create(sctx->b.b.screen,
                                                   R600_RESOURCE_FLAG_UNMAPPABLE,
                                                   PIPE_USAGE_DEFAULT,
                                                   gsvs_ring_size, alignment);
                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) {
                        assert(sctx->b.chip_class <= VI);
                        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, PIPE_FLUSH_ASYNC, NULL);

        /* Set ring bindings. */
        if (sctx->esgs_ring) {
                assert(sctx->b.chip_class <= VI);
                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_RING_GSVS,
                                   sctx->gsvs_ring, 0, sctx->gsvs_ring->width0,
                                   false, false, 0, 0, 0);
        }

        return true;
}

static void si_shader_lock(struct si_shader *shader)
{
        mtx_lock(&shader->selector->mutex);
        if (shader->previous_stage_sel) {
                assert(shader->previous_stage_sel != shader->selector);
                mtx_lock(&shader->previous_stage_sel->mutex);
        }
}

static void si_shader_unlock(struct si_shader *shader)
{
        if (shader->previous_stage_sel)
                mtx_unlock(&shader->previous_stage_sel->mutex);
        mtx_unlock(&shader->selector->mutex);
}

/**
 * @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;

        /* Prevent race conditions when updating:
         * - si_shader::scratch_bo
         * - si_shader::binary::code
         * - si_shader::previous_stage::binary::code.
         */
        si_shader_lock(shader);

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

        assert(sctx->scratch_buffer);

        if (shader->previous_stage)
                si_shader_apply_scratch_relocs(shader->previous_stage, scratch_va);

        si_shader_apply_scratch_relocs(shader, 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) {
                si_shader_unlock(shader);
                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);

        si_shader_unlock(shader);
        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 struct si_shader *si_get_tcs_current(struct si_context *sctx)
{
        if (!sctx->tes_shader.cso)
                return NULL; /* tessellation disabled */

        return sctx->tcs_shader.cso ? sctx->tcs_shader.current :
                                      sctx->fixed_func_tcs_shader.current;
}

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->tes_shader.current));

        if (sctx->tes_shader.cso) {
                struct si_shader *tcs = si_get_tcs_current(sctx);

                bytes = MAX2(bytes, si_get_scratch_buffer_bytes_per_wave(tcs));
        }
        return bytes;
}

static bool si_update_scratch_relocs(struct si_context *sctx)
{
        struct si_shader *tcs = si_get_tcs_current(sctx);
        int r;

        /* Update the shaders, so that 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, tcs);
        if (r < 0)
                return false;
        if (r == 1)
                si_pm4_bind_state(sctx, hs, tcs->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);
        }

        return true;
}

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;

        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 = (struct r600_resource*)
                                si_aligned_buffer_create(&sctx->screen->b,
                                                           R600_RESOURCE_FLAG_UNMAPPABLE,
                                                           PIPE_USAGE_DEFAULT,
                                                           scratch_needed_size, 256);
                        if (!sctx->scratch_buffer)
                                return false;

                        si_mark_atom_dirty(sctx, &sctx->scratch_state);
                        si_context_add_resource_size(&sctx->b.b,
                                                     &sctx->scratch_buffer->b.b);
                }

                if (!si_update_scratch_relocs(sctx))
                        return false;
        }

        /* 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;
                si_mark_atom_dirty(sctx, &sctx->scratch_state);
        }
        return true;
}

static void si_init_tess_factor_ring(struct si_context *sctx)
{
        bool double_offchip_buffers = sctx->b.chip_class >= CIK &&
                                      sctx->b.family != CHIP_CARRIZO &&
                                      sctx->b.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 = double_offchip_buffers ? 127 : 63;
        unsigned max_offchip_buffers = max_offchip_buffers_per_se *
                                       sctx->screen->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;
        }

        assert(!sctx->tf_ring);
        /* Use 64K alignment for both rings, so that we can pass the address
         * to shaders as one SGPR containing bits [16:47].
         */
        sctx->tf_ring = si_aligned_buffer_create(sctx->b.b.screen,
                                                   R600_RESOURCE_FLAG_UNMAPPABLE,
                                                   PIPE_USAGE_DEFAULT,
                                                   32768 * sctx->screen->info.max_se,
                                                   64 * 1024);
        if (!sctx->tf_ring)
                return;

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

        sctx->tess_offchip_ring =
                si_aligned_buffer_create(sctx->b.b.screen,
                                           R600_RESOURCE_FLAG_UNMAPPABLE,
                                           PIPE_USAGE_DEFAULT,
                                           max_offchip_buffers *
                                           sctx->screen->tess_offchip_block_dw_size * 4,
                                           64 * 1024);
        if (!sctx->tess_offchip_ring)
                return;

        si_init_config_add_vgt_flush(sctx);

        uint64_t offchip_va = r600_resource(sctx->tess_offchip_ring)->gpu_address;
        uint64_t factor_va = r600_resource(sctx->tf_ring)->gpu_address;
        assert((offchip_va & 0xffff) == 0);
        assert((factor_va & 0xffff) == 0);

        si_pm4_add_bo(sctx->init_config, r600_resource(sctx->tess_offchip_ring),
                      RADEON_USAGE_READWRITE, RADEON_PRIO_SHADER_RINGS);
        si_pm4_add_bo(sctx->init_config, r600_resource(sctx->tf_ring),
                      RADEON_USAGE_READWRITE, RADEON_PRIO_SHADER_RINGS);

        /* 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,
                               factor_va >> 8);
                if (sctx->b.chip_class >= GFX9)
                        si_pm4_set_reg(sctx->init_config, R_030944_VGT_TF_MEMORY_BASE_HI,
                                       factor_va >> 40);
                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,
                               factor_va >> 8);
                si_pm4_set_reg(sctx->init_config, R_0089B0_VGT_HS_OFFCHIP_PARAM,
                               S_0089B0_OFFCHIP_BUFFERING(max_offchip_buffers));
        }

        if (sctx->b.chip_class >= GFX9) {
                si_pm4_set_reg(sctx->init_config,
                               R_00B430_SPI_SHADER_USER_DATA_LS_0 +
                               GFX9_SGPR_TCS_OFFCHIP_ADDR_BASE64K * 4,
                               offchip_va >> 16);
                si_pm4_set_reg(sctx->init_config,
                               R_00B430_SPI_SHADER_USER_DATA_LS_0 +
                               GFX9_SGPR_TCS_FACTOR_ADDR_BASE64K * 4,
                               factor_va >> 16);
        } else {
                si_pm4_set_reg(sctx->init_config,
                               R_00B430_SPI_SHADER_USER_DATA_HS_0 +
                               GFX6_SGPR_TCS_OFFCHIP_ADDR_BASE64K * 4,
                               offchip_va >> 16);
                si_pm4_set_reg(sctx->init_config,
                               R_00B430_SPI_SHADER_USER_DATA_HS_0 +
                               GFX6_SGPR_TCS_FACTOR_ADDR_BASE64K * 4,
                               factor_va >> 16);
        }

        /* 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, PIPE_FLUSH_ASYNC, NULL);
}

/**
 * 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);
                }

                if (sctx->b.chip_class >= GFX9)
                        stages |= S_028B54_MAX_PRIMGRP_IN_WAVE(2);

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

bool si_update_shaders(struct si_context *sctx)
{
        struct pipe_context *ctx = (struct pipe_context*)sctx;
        struct si_compiler_ctx_state compiler_state;
        struct si_state_rasterizer *rs = sctx->queued.named.rasterizer;
        struct si_shader *old_vs = si_get_vs_state(sctx);
        bool old_clip_disable = old_vs ? old_vs->key.opt.clip_disable : false;
        struct si_shader *old_ps = sctx->ps_shader.current;
        unsigned old_spi_shader_col_format =
                old_ps ? old_ps->key.part.ps.epilog.spi_shader_col_format : 0;
        int r;

        compiler_state.tm = sctx->tm;
        compiler_state.debug = sctx->debug;
        compiler_state.is_debug_context = sctx->is_debug;

        /* 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 */
                if (sctx->b.chip_class <= VI) {
                        r = si_shader_select(ctx, &sctx->vs_shader,
                                             &compiler_state);
                        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,
                                             &compiler_state);
                        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,
                                             &compiler_state);
                        if (r)
                                return false;
                        si_pm4_bind_state(sctx, hs,
                                          sctx->fixed_func_tcs_shader.current->pm4);
                }

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

                        si_pm4_bind_state(sctx, ls, NULL);
                        si_pm4_bind_state(sctx, hs, NULL);
                }
        } else {
                /* VS as VS */
                r = si_shader_select(ctx, &sctx->vs_shader, &compiler_state);
                if (r)
                        return false;
                si_pm4_bind_state(sctx, vs, sctx->vs_shader.current->pm4);
                si_pm4_bind_state(sctx, ls, NULL);
                si_pm4_bind_state(sctx, hs, NULL);
        }

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

                if (!si_update_gs_ring_buffers(sctx))
                        return false;
        } else {
                si_pm4_bind_state(sctx, gs, NULL);
                if (sctx->b.chip_class <= VI)
                        si_pm4_bind_state(sctx, es, NULL);
        }

        si_update_vgt_shader_config(sctx);

        if (old_clip_disable != si_get_vs_state(sctx)->key.opt.clip_disable)
                si_mark_atom_dirty(sctx, &sctx->clip_regs);

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

                r = si_shader_select(ctx, &sctx->ps_shader, &compiler_state);
                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);

                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->screen->rbplus_allowed &&
                    si_pm4_state_changed(sctx, ps) &&
                    (!old_ps ||
                     old_spi_shader_col_format !=
                     sctx->ps_shader.current->key.part.ps.epilog.spi_shader_col_format))
                        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->screen->dpbb_allowed)
                                si_mark_atom_dirty(sctx, &sctx->dpbb_state);
                }

                if (sctx->smoothing_enabled != sctx->ps_shader.current->key.part.ps.epilog.poly_line_smoothing) {
                        sctx->smoothing_enabled = sctx->ps_shader.current->key.part.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 (sctx->framebuffer.nr_samples <= 1)
                                si_mark_atom_dirty(sctx, &sctx->msaa_sample_locs.atom);
                }
        }

        if (si_pm4_state_enabled_and_changed(sctx, ls) ||
            si_pm4_state_enabled_and_changed(sctx, hs) ||
            si_pm4_state_enabled_and_changed(sctx, es) ||
            si_pm4_state_enabled_and_changed(sctx, gs) ||
            si_pm4_state_enabled_and_changed(sctx, vs) ||
            si_pm4_state_enabled_and_changed(sctx, ps)) {
                if (!si_update_spi_tmpring_size(sctx))
                        return false;
        }

        if (sctx->b.chip_class >= CIK) {
                if (si_pm4_state_enabled_and_changed(sctx, ls))
                        sctx->prefetch_L2_mask |= SI_PREFETCH_LS;
                else if (!sctx->queued.named.ls)
                        sctx->prefetch_L2_mask &= ~SI_PREFETCH_LS;

                if (si_pm4_state_enabled_and_changed(sctx, hs))
                        sctx->prefetch_L2_mask |= SI_PREFETCH_HS;
                else if (!sctx->queued.named.hs)
                        sctx->prefetch_L2_mask &= ~SI_PREFETCH_HS;

                if (si_pm4_state_enabled_and_changed(sctx, es))
                        sctx->prefetch_L2_mask |= SI_PREFETCH_ES;
                else if (!sctx->queued.named.es)
                        sctx->prefetch_L2_mask &= ~SI_PREFETCH_ES;

                if (si_pm4_state_enabled_and_changed(sctx, gs))
                        sctx->prefetch_L2_mask |= SI_PREFETCH_GS;
                else if (!sctx->queued.named.gs)
                        sctx->prefetch_L2_mask &= ~SI_PREFETCH_GS;

                if (si_pm4_state_enabled_and_changed(sctx, vs))
                        sctx->prefetch_L2_mask |= SI_PREFETCH_VS;
                else if (!sctx->queued.named.vs)
                        sctx->prefetch_L2_mask &= ~SI_PREFETCH_VS;

                if (si_pm4_state_enabled_and_changed(sctx, ps))
                        sctx->prefetch_L2_mask |= SI_PREFETCH_PS;
                else if (!sctx->queued.named.ps)
                        sctx->prefetch_L2_mask &= ~SI_PREFETCH_PS;
        }

        sctx->do_update_shaders = false;
        return true;
}

static void si_emit_scratch_state(struct si_context *sctx,
                                  struct r600_atom *atom)
{
        struct radeon_winsys_cs *cs = sctx->b.gfx.cs;

        radeon_set_context_reg(cs, R_0286E8_SPI_TMPRING_SIZE,
                               sctx->spi_tmpring_size);

        if (sctx->scratch_buffer) {
                radeon_add_to_buffer_list(&sctx->b, &sctx->b.gfx,
                                      sctx->scratch_buffer, RADEON_USAGE_READWRITE,
                                      RADEON_PRIO_SCRATCH_BUFFER);
        }
}

void *si_get_blit_vs(struct si_context *sctx, enum blitter_attrib_type type,
                     unsigned num_layers)
{
        struct pipe_context *pipe = &sctx->b.b;
        unsigned vs_blit_property;
        void **vs;

        switch (type) {
        case UTIL_BLITTER_ATTRIB_NONE:
                vs = num_layers > 1 ? &sctx->vs_blit_pos_layered :
                                      &sctx->vs_blit_pos;
                vs_blit_property = SI_VS_BLIT_SGPRS_POS;
                break;
        case UTIL_BLITTER_ATTRIB_COLOR:
                vs = num_layers > 1 ? &sctx->vs_blit_color_layered :
                                      &sctx->vs_blit_color;
                vs_blit_property = SI_VS_BLIT_SGPRS_POS_COLOR;
                break;
        case UTIL_BLITTER_ATTRIB_TEXCOORD_XY:
        case UTIL_BLITTER_ATTRIB_TEXCOORD_XYZW:
                assert(num_layers == 1);
                vs = &sctx->vs_blit_texcoord;
                vs_blit_property = SI_VS_BLIT_SGPRS_POS_TEXCOORD;
                break;
        default:
                assert(0);
                return NULL;
        }
        if (*vs)
                return *vs;

        struct ureg_program *ureg = ureg_create(PIPE_SHADER_VERTEX);
        if (!ureg)
                return NULL;

        /* Tell the shader to load VS inputs from SGPRs: */
        ureg_property(ureg, TGSI_PROPERTY_VS_BLIT_SGPRS, vs_blit_property);
        ureg_property(ureg, TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION, true);

        /* This is just a pass-through shader with 1-3 MOV instructions. */
        ureg_MOV(ureg,
                 ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0),
                 ureg_DECL_vs_input(ureg, 0));

        if (type != UTIL_BLITTER_ATTRIB_NONE) {
                ureg_MOV(ureg,
                         ureg_DECL_output(ureg, TGSI_SEMANTIC_GENERIC, 0),
                         ureg_DECL_vs_input(ureg, 1));
        }

        if (num_layers > 1) {
                struct ureg_src instance_id =
                        ureg_DECL_system_value(ureg, TGSI_SEMANTIC_INSTANCEID, 0);
                struct ureg_dst layer =
                        ureg_DECL_output(ureg, TGSI_SEMANTIC_LAYER, 0);

                ureg_MOV(ureg, ureg_writemask(layer, TGSI_WRITEMASK_X),
                         ureg_scalar(instance_id, TGSI_SWIZZLE_X));
        }
        ureg_END(ureg);

        *vs = ureg_create_shader_and_destroy(ureg, pipe);
        return *vs;
}

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);
        si_init_atom(sctx, &sctx->scratch_state, &sctx->atoms.s.scratch_state,
                     si_emit_scratch_state);

        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;
}