src/gallium/drivers/iris/iris_program_cache.c

   1 /*
   2  * Copyright © 2017 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 /**
  24  * @file iris_program_cache.c
  25  *
  26  * The in-memory program cache.  This is basically a hash table mapping
  27  * API-specified shaders and a state key to a compiled variant.  It also
  28  * takes care of uploading shader assembly into a BO for use on the GPU.
  29  */
  30
  31 #include <stdio.h>
  32 #include <errno.h>
  33 #include "pipe/p_defines.h"
  34 #include "pipe/p_state.h"
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_screen.h"
  37 #include "util/u_atomic.h"
  38 #include "util/u_upload_mgr.h"
  39 #include "compiler/nir/nir.h"
  40 #include "compiler/nir/nir_builder.h"
  41 #include "intel/compiler/brw_compiler.h"
  42 #include "intel/compiler/brw_eu.h"
  43 #include "intel/compiler/brw_nir.h"
  44 #include "iris_context.h"
  45 #include "iris_resource.h"
  46
  47 struct keybox {
  48    uint8_t size;
  49    enum iris_program_cache_id cache_id;
  50    uint8_t data[0];
  51 };
  52
  53 static struct keybox *
  54 make_keybox(void *mem_ctx,
  55             enum iris_program_cache_id cache_id,
  56             const void *key,
  57             uint32_t key_size)
  58 {
  59    struct keybox *keybox =
  60       ralloc_size(mem_ctx, sizeof(struct keybox) + key_size);
  61
  62    keybox->cache_id = cache_id;
  63    keybox->size = key_size;
  64    memcpy(keybox->data, key, key_size);
  65
  66    return keybox;
  67 }
  68
  69 static uint32_t
  70 keybox_hash(const void *void_key)
  71 {
  72    const struct keybox *key = void_key;
  73    return _mesa_hash_data(&key->cache_id, key->size + sizeof(key->cache_id));
  74 }
  75
  76 static bool
  77 keybox_equals(const void *void_a, const void *void_b)
  78 {
  79    const struct keybox *a = void_a, *b = void_b;
  80    if (a->size != b->size)
  81       return false;
  82
  83    return memcmp(a->data, b->data, a->size) == 0;
  84 }
  85
  86 static unsigned
  87 get_program_string_id(enum iris_program_cache_id cache_id, const void *key)
  88 {
  89    switch (cache_id) {
  90    case IRIS_CACHE_VS:
  91       return ((struct brw_vs_prog_key *) key)->program_string_id;
  92    case IRIS_CACHE_TCS:
  93       return ((struct brw_tcs_prog_key *) key)->program_string_id;
  94    case IRIS_CACHE_TES:
  95       return ((struct brw_tes_prog_key *) key)->program_string_id;
  96    case IRIS_CACHE_GS:
  97       return ((struct brw_gs_prog_key *) key)->program_string_id;
  98    case IRIS_CACHE_CS:
  99       return ((struct brw_cs_prog_key *) key)->program_string_id;
 100    case IRIS_CACHE_FS:
 101       return ((struct brw_wm_prog_key *) key)->program_string_id;
 102    default:
 103       unreachable("no program string id for this kind of program");
 104    }
 105 }
 106
 107 struct iris_compiled_shader *
 108 iris_find_cached_shader(struct iris_context *ice,
 109                         enum iris_program_cache_id cache_id,
 110                         uint32_t key_size,
 111                         const void *key)
 112 {
 113    struct keybox *keybox =
 114       make_keybox(ice->shaders.cache, cache_id, key, key_size);
 115    struct hash_entry *entry =
 116       _mesa_hash_table_search(ice->shaders.cache, keybox);
 117
 118    ralloc_free(keybox);
 119
 120    return entry ? entry->data : NULL;
 121 }
 122
 123 const void *
 124 iris_find_previous_compile(const struct iris_context *ice,
 125                            enum iris_program_cache_id cache_id,
 126                            unsigned program_string_id)
 127 {
 128    hash_table_foreach(ice->shaders.cache, entry) {
 129       const struct keybox *keybox = entry->key;
 130       if (keybox->cache_id == cache_id &&
 131           get_program_string_id(cache_id, keybox->data) == program_string_id) {
 132          return keybox->data;
 133       }
 134    }
 135
 136    return NULL;
 137 }
 138
 139 /**
 140  * Look for an existing entry in the cache that has identical assembly code.
 141  *
 142  * This is useful for programs generating shaders at runtime, where multiple
 143  * distinct shaders (from an API perspective) may compile to the same assembly
 144  * in our backend.  This saves space in the program cache buffer.
 145  */
 146 static const struct iris_compiled_shader *
 147 find_existing_assembly(struct hash_table *cache,
 148                        const void *assembly,
 149                        unsigned assembly_size)
 150 {
 151    hash_table_foreach(cache, entry) {
 152       const struct iris_compiled_shader *existing = entry->data;
 153       if (existing->prog_data->program_size == assembly_size &&
 154           memcmp(existing->map, assembly, assembly_size) == 0)
 155          return existing;
 156    }
 157    return NULL;
 158 }
 159
 160 struct iris_compiled_shader *
 161 iris_upload_shader(struct iris_context *ice,
 162                    enum iris_program_cache_id cache_id,
 163                    uint32_t key_size,
 164                    const void *key,
 165                    const void *assembly,
 166                    struct brw_stage_prog_data *prog_data,
 167                    uint32_t *streamout,
 168                    enum brw_param_builtin *system_values,
 169                    unsigned num_system_values)
 170 {
 171    struct hash_table *cache = ice->shaders.cache;
 172    struct iris_compiled_shader *shader =
 173       rzalloc_size(cache, sizeof(struct iris_compiled_shader) +
 174                    ice->vtbl.derived_program_state_size(cache_id));
 175    const struct iris_compiled_shader *existing =
 176       find_existing_assembly(cache, assembly, prog_data->program_size);
 177
 178    /* If we can find a matching prog in the cache already, then reuse the
 179     * existing stuff without creating new copy into the underlying buffer
 180     * object.  This is notably useful for programs generating shaders at
 181     * runtime, where multiple shaders may compile to the same thing in our
 182     * backend.
 183     */
 184    if (existing) {
 185       pipe_resource_reference(&shader->assembly.res, existing->assembly.res);
 186       shader->assembly.offset = existing->assembly.offset;
 187       shader->map = existing->map;
 188    } else {
 189       shader->assembly.res = NULL;
 190       u_upload_alloc(ice->shaders.uploader, 0, prog_data->program_size, 64,
 191                      &shader->assembly.offset, &shader->assembly.res,
 192                      &shader->map);
 193       memcpy(shader->map, assembly, prog_data->program_size);
 194    }
 195
 196    shader->prog_data = prog_data;
 197    shader->streamout = streamout;
 198    shader->system_values = system_values;
 199    shader->num_system_values = num_system_values;
 200
 201    ralloc_steal(shader, shader->prog_data);
 202    ralloc_steal(shader->prog_data, prog_data->param);
 203    ralloc_steal(shader->prog_data, prog_data->pull_param);
 204    ralloc_steal(shader, shader->streamout);
 205    ralloc_steal(shader, shader->system_values);
 206
 207    /* Store the 3DSTATE shader packets and other derived state. */
 208    ice->vtbl.store_derived_program_state(ice, cache_id, shader);
 209
 210    struct keybox *keybox = make_keybox(cache, cache_id, key, key_size);
 211    _mesa_hash_table_insert(ice->shaders.cache, keybox, shader);
 212
 213    return shader;
 214 }
 215
 216 bool
 217 iris_blorp_lookup_shader(struct blorp_batch *blorp_batch,
 218                          const void *key, uint32_t key_size,
 219                          uint32_t *kernel_out, void *prog_data_out)
 220 {
 221    struct blorp_context *blorp = blorp_batch->blorp;
 222    struct iris_context *ice = blorp->driver_ctx;
 223    struct iris_batch *batch = blorp_batch->driver_batch;
 224    struct iris_compiled_shader *shader =
 225       iris_find_cached_shader(ice, IRIS_CACHE_BLORP, key_size, key);
 226
 227    if (!shader)
 228       return false;
 229
 230    struct iris_bo *bo = iris_resource_bo(shader->assembly.res);
 231    *kernel_out =
 232       iris_bo_offset_from_base_address(bo) + shader->assembly.offset;
 233    *((void **) prog_data_out) = shader->prog_data;
 234
 235    iris_use_pinned_bo(batch, bo, false);
 236
 237    return true;
 238 }
 239
 240 bool
 241 iris_blorp_upload_shader(struct blorp_batch *blorp_batch,
 242                          const void *key, uint32_t key_size,
 243                          const void *kernel, UNUSED uint32_t kernel_size,
 244                          const struct brw_stage_prog_data *prog_data_templ,
 245                          UNUSED uint32_t prog_data_size,
 246                          uint32_t *kernel_out, void *prog_data_out)
 247 {
 248    struct blorp_context *blorp = blorp_batch->blorp;
 249    struct iris_context *ice = blorp->driver_ctx;
 250    struct iris_batch *batch = blorp_batch->driver_batch;
 251
 252    void *prog_data = ralloc_size(NULL, prog_data_size);
 253    memcpy(prog_data, prog_data_templ, prog_data_size);
 254
 255    struct iris_compiled_shader *shader =
 256       iris_upload_shader(ice, IRIS_CACHE_BLORP, key_size, key, kernel,
 257                          prog_data, NULL, NULL, 0);
 258
 259    struct iris_bo *bo = iris_resource_bo(shader->assembly.res);
 260    *kernel_out =
 261       iris_bo_offset_from_base_address(bo) + shader->assembly.offset;
 262    *((void **) prog_data_out) = shader->prog_data;
 263
 264    iris_use_pinned_bo(batch, bo, false);
 265
 266    return true;
 267 }
 268
 269 void
 270 iris_init_program_cache(struct iris_context *ice)
 271 {
 272    ice->shaders.cache =
 273       _mesa_hash_table_create(ice, keybox_hash, keybox_equals);
 274
 275    ice->shaders.uploader =
 276       u_upload_create(&ice->ctx, 16384, PIPE_BIND_CUSTOM, PIPE_USAGE_IMMUTABLE,
 277                       IRIS_RESOURCE_FLAG_SHADER_MEMZONE);
 278 }
 279
 280 void
 281 iris_destroy_program_cache(struct iris_context *ice)
 282 {
 283    for (int i = 0; i < MESA_SHADER_STAGES; i++) {
 284       ice->shaders.prog[i] = NULL;
 285    }
 286
 287    hash_table_foreach(ice->shaders.cache, entry) {
 288       struct iris_compiled_shader *shader = entry->data;
 289       pipe_resource_reference(&shader->assembly.res, NULL);
 290    }
 291
 292    u_upload_destroy(ice->shaders.uploader);
 293
 294    ralloc_free(ice->shaders.cache);
 295 }
 296
 297 static const char *
 298 cache_name(enum iris_program_cache_id cache_id)
 299 {
 300    if (cache_id == IRIS_CACHE_BLORP)
 301       return "BLORP";
 302
 303    return _mesa_shader_stage_to_string(cache_id);
 304 }
 305
 306 void
 307 iris_print_program_cache(struct iris_context *ice)
 308 {
 309    struct iris_screen *screen = (struct iris_screen *)ice->ctx.screen;
 310    const struct gen_device_info *devinfo = &screen->devinfo;
 311
 312    hash_table_foreach(ice->shaders.cache, entry) {
 313       const struct keybox *keybox = entry->key;
 314       struct iris_compiled_shader *shader = entry->data;
 315       fprintf(stderr, "%s:\n", cache_name(keybox->cache_id));
 316       brw_disassemble(devinfo, shader->map, 0,
 317                       shader->prog_data->program_size, stderr);
 318    }
 319 }