src/gallium/drivers/radeonsi/si_compute.c

   1 /*
   2  * Copyright 2013 Advanced Micro Devices, Inc.
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include "util/u_memory.h"
  26
  27 #include "radeon/r600_cs.h"
  28 #include "si_pipe.h"
  29 #include "si_shader.h"
  30 #include "sid.h"
  31
  32 #include "radeon/radeon_llvm_util.h"
  33
  34 #define MAX_GLOBAL_BUFFERS 20
  35 #if HAVE_LLVM < 0x0305
  36 #define NUM_USER_SGPRS 2
  37 #else
  38 #define NUM_USER_SGPRS 4
  39 #endif
  40
  41 struct si_pipe_compute {
  42         struct si_context *ctx;
  43
  44         unsigned local_size;
  45         unsigned private_size;
  46         unsigned input_size;
  47         unsigned num_kernels;
  48         struct si_shader *kernels;
  49         unsigned num_user_sgprs;
  50
  51         struct r600_resource *input_buffer;
  52         struct pipe_resource *global_buffers[MAX_GLOBAL_BUFFERS];
  53
  54         LLVMContextRef llvm_ctx;
  55 };
  56
  57 static void *si_create_compute_state(
  58         struct pipe_context *ctx,
  59         const struct pipe_compute_state *cso)
  60 {
  61         struct si_context *sctx = (struct si_context *)ctx;
  62         struct si_pipe_compute *program =
  63                                         CALLOC_STRUCT(si_pipe_compute);
  64         const struct pipe_llvm_program_header *header;
  65         const unsigned char *code;
  66         unsigned i;
  67
  68         program->llvm_ctx = LLVMContextCreate();
  69
  70         header = cso->prog;
  71         code = cso->prog + sizeof(struct pipe_llvm_program_header);
  72
  73         program->ctx = sctx;
  74         program->local_size = cso->req_local_mem;
  75         program->private_size = cso->req_private_mem;
  76         program->input_size = cso->req_input_mem;
  77
  78         program->num_kernels = radeon_llvm_get_num_kernels(program->llvm_ctx, code,
  79                                                         header->num_bytes);
  80         program->kernels = CALLOC(sizeof(struct si_shader),
  81                                                         program->num_kernels);
  82         for (i = 0; i < program->num_kernels; i++) {
  83                 LLVMModuleRef mod = radeon_llvm_get_kernel_module(program->llvm_ctx, i,
  84                                                         code, header->num_bytes);
  85                 si_compile_llvm(sctx, &program->kernels[i], mod);
  86                 LLVMDisposeModule(mod);
  87         }
  88
  89         program->input_buffer = si_resource_create_custom(sctx->b.b.screen,
  90                 PIPE_USAGE_IMMUTABLE, program->input_size);
  91
  92         return program;
  93 }
  94
  95 static void si_bind_compute_state(struct pipe_context *ctx, void *state)
  96 {
  97         struct si_context *sctx = (struct si_context*)ctx;
  98         sctx->cs_shader_state.program = (struct si_pipe_compute*)state;
  99 }
 100
 101 static void si_set_global_binding(
 102         struct pipe_context *ctx, unsigned first, unsigned n,
 103         struct pipe_resource **resources,
 104         uint32_t **handles)
 105 {
 106         unsigned i;
 107         struct si_context *sctx = (struct si_context*)ctx;
 108         struct si_pipe_compute *program = sctx->cs_shader_state.program;
 109
 110         if (!resources) {
 111                 for (i = first; i < first + n; i++) {
 112                         pipe_resource_reference(&program->global_buffers[i], NULL);
 113                 }
 114                 return;
 115         }
 116
 117         for (i = first; i < first + n; i++) {
 118                 uint64_t va;
 119                 uint32_t offset;
 120                 pipe_resource_reference(&program->global_buffers[i], resources[i]);
 121                 va = r600_resource(resources[i])->gpu_address;
 122                 offset = util_le32_to_cpu(*handles[i]);
 123                 va += offset;
 124                 va = util_cpu_to_le64(va);
 125                 memcpy(handles[i], &va, sizeof(va));
 126         }
 127 }
 128
 129 /**
 130  * This function computes the value for R_00B860_COMPUTE_TMPRING_SIZE.WAVES
 131  * /p block_layout is the number of threads in each work group.
 132  * /p grid layout is the number of work groups.
 133  */
 134 static unsigned compute_num_waves_for_scratch(
 135                 const struct radeon_info *info,
 136                 const uint *block_layout,
 137                 const uint *grid_layout)
 138 {
 139         unsigned num_sh = MAX2(info->max_sh_per_se, 1);
 140         unsigned num_se = MAX2(info->max_se, 1);
 141         unsigned num_blocks = 1;
 142         unsigned threads_per_block = 1;
 143         unsigned waves_per_block;
 144         unsigned waves_per_sh;
 145         unsigned waves;
 146         unsigned scratch_waves;
 147         unsigned i;
 148
 149         for (i = 0; i < 3; i++) {
 150                 threads_per_block *= block_layout[i];
 151                 num_blocks *= grid_layout[i];
 152         }
 153
 154         waves_per_block = align(threads_per_block, 64) / 64;
 155         waves = waves_per_block * num_blocks;
 156         waves_per_sh = align(waves, num_sh * num_se) / (num_sh * num_se);
 157         scratch_waves = waves_per_sh * num_sh * num_se;
 158
 159         if (waves_per_block > waves_per_sh) {
 160                 scratch_waves = waves_per_block * num_sh * num_se;
 161         }
 162
 163         return scratch_waves;
 164 }
 165
 166 static void si_launch_grid(
 167                 struct pipe_context *ctx,
 168                 const uint *block_layout, const uint *grid_layout,
 169                 uint32_t pc, const void *input)
 170 {
 171         struct si_context *sctx = (struct si_context*)ctx;
 172         struct si_pipe_compute *program = sctx->cs_shader_state.program;
 173         struct si_pm4_state *pm4 = CALLOC_STRUCT(si_pm4_state);
 174         struct r600_resource *input_buffer = program->input_buffer;
 175         unsigned kernel_args_size;
 176         unsigned num_work_size_bytes = 36;
 177         uint32_t kernel_args_offset = 0;
 178         uint32_t *kernel_args;
 179         uint64_t kernel_args_va;
 180         uint64_t scratch_buffer_va = 0;
 181         uint64_t shader_va;
 182         unsigned arg_user_sgpr_count = NUM_USER_SGPRS;
 183         unsigned i;
 184         struct si_shader *shader = &program->kernels[pc];
 185         unsigned lds_blocks;
 186         unsigned num_waves_for_scratch;
 187
 188         pm4->compute_pkt = true;
 189         si_cmd_context_control(pm4);
 190
 191         si_pm4_cmd_begin(pm4, PKT3_EVENT_WRITE);
 192         si_pm4_cmd_add(pm4, EVENT_TYPE(EVENT_TYPE_CACHE_FLUSH) |
 193                             EVENT_INDEX(0x7) |
 194                             EVENT_WRITE_INV_L2);
 195         si_pm4_cmd_end(pm4, false);
 196
 197         si_pm4_inval_texture_cache(pm4);
 198         si_pm4_inval_shader_cache(pm4);
 199         si_cmd_surface_sync(pm4, pm4->cp_coher_cntl);
 200
 201         /* Upload the kernel arguments */
 202
 203         /* The extra num_work_size_bytes are for work group / work item size information */
 204         kernel_args_size = program->input_size + num_work_size_bytes + 8 /* For scratch va */;
 205
 206         kernel_args = sctx->b.ws->buffer_map(input_buffer->cs_buf,
 207                         sctx->b.rings.gfx.cs, PIPE_TRANSFER_WRITE);
 208         for (i = 0; i < 3; i++) {
 209                 kernel_args[i] = grid_layout[i];
 210                 kernel_args[i + 3] = grid_layout[i] * block_layout[i];
 211                 kernel_args[i + 6] = block_layout[i];
 212         }
 213
 214         num_waves_for_scratch = compute_num_waves_for_scratch(
 215                 &sctx->screen->b.info, block_layout, grid_layout);
 216
 217         memcpy(kernel_args + (num_work_size_bytes / 4), input, program->input_size);
 218
 219         if (shader->scratch_bytes_per_wave > 0) {
 220                 unsigned scratch_bytes = shader->scratch_bytes_per_wave *
 221                                                 num_waves_for_scratch;
 222
 223                 COMPUTE_DBG(sctx->screen, "Waves: %u; Scratch per wave: %u bytes; "
 224                             "Total Scratch: %u bytes\n", num_waves_for_scratch,
 225                             shader->scratch_bytes_per_wave, scratch_bytes);
 226                 if (!shader->scratch_bo) {
 227                         shader->scratch_bo = (struct r600_resource*)
 228                                 si_resource_create_custom(sctx->b.b.screen,
 229                                 PIPE_USAGE_DEFAULT, scratch_bytes);
 230                 }
 231                 scratch_buffer_va = shader->scratch_bo->gpu_address;
 232                 si_pm4_add_bo(pm4, shader->scratch_bo,
 233                                 RADEON_USAGE_READWRITE,
 234                                 RADEON_PRIO_SHADER_RESOURCE_RW);
 235
 236         }
 237
 238         for (i = 0; i < (kernel_args_size / 4); i++) {
 239                 COMPUTE_DBG(sctx->screen, "input %u : %u\n", i,
 240                         kernel_args[i]);
 241         }
 242
 243         sctx->b.ws->buffer_unmap(input_buffer->cs_buf);
 244
 245         kernel_args_va = input_buffer->gpu_address;
 246         kernel_args_va += kernel_args_offset;
 247
 248         si_pm4_add_bo(pm4, input_buffer, RADEON_USAGE_READ,
 249                 RADEON_PRIO_SHADER_DATA);
 250
 251         si_pm4_set_reg(pm4, R_00B900_COMPUTE_USER_DATA_0, kernel_args_va);
 252         si_pm4_set_reg(pm4, R_00B900_COMPUTE_USER_DATA_0 + 4, S_008F04_BASE_ADDRESS_HI (kernel_args_va >> 32) | S_008F04_STRIDE(0));
 253         si_pm4_set_reg(pm4, R_00B900_COMPUTE_USER_DATA_0 + 8, scratch_buffer_va);
 254         si_pm4_set_reg(pm4, R_00B900_COMPUTE_USER_DATA_0 + 12,
 255                 S_008F04_BASE_ADDRESS_HI(scratch_buffer_va >> 32)
 256                 |  S_008F04_STRIDE(shader->scratch_bytes_per_wave / 64));
 257
 258         si_pm4_set_reg(pm4, R_00B810_COMPUTE_START_X, 0);
 259         si_pm4_set_reg(pm4, R_00B814_COMPUTE_START_Y, 0);
 260         si_pm4_set_reg(pm4, R_00B818_COMPUTE_START_Z, 0);
 261
 262         si_pm4_set_reg(pm4, R_00B81C_COMPUTE_NUM_THREAD_X,
 263                                 S_00B81C_NUM_THREAD_FULL(block_layout[0]));
 264         si_pm4_set_reg(pm4, R_00B820_COMPUTE_NUM_THREAD_Y,
 265                                 S_00B820_NUM_THREAD_FULL(block_layout[1]));
 266         si_pm4_set_reg(pm4, R_00B824_COMPUTE_NUM_THREAD_Z,
 267                                 S_00B824_NUM_THREAD_FULL(block_layout[2]));
 268
 269         /* Global buffers */
 270         for (i = 0; i < MAX_GLOBAL_BUFFERS; i++) {
 271                 struct r600_resource *buffer =
 272                                 (struct r600_resource*)program->global_buffers[i];
 273                 if (!buffer) {
 274                         continue;
 275                 }
 276                 si_pm4_add_bo(pm4, buffer, RADEON_USAGE_READWRITE, RADEON_PRIO_SHADER_RESOURCE_RW);
 277         }
 278
 279         /* This register has been moved to R_00CD20_COMPUTE_MAX_WAVE_ID
 280          * and is now per pipe, so it should be handled in the
 281          * kernel if we want to use something other than the default value,
 282          * which is now 0x22f.
 283          */
 284         if (sctx->b.chip_class <= SI) {
 285                 /* XXX: This should be:
 286                  * (number of compute units) * 4 * (waves per simd) - 1 */
 287
 288                 si_pm4_set_reg(pm4, R_00B82C_COMPUTE_MAX_WAVE_ID,
 289                                                 0x190 /* Default value */);
 290         }
 291
 292         shader_va = shader->bo->gpu_address;
 293         si_pm4_add_bo(pm4, shader->bo, RADEON_USAGE_READ, RADEON_PRIO_SHADER_DATA);
 294         si_pm4_set_reg(pm4, R_00B830_COMPUTE_PGM_LO, (shader_va >> 8) & 0xffffffff);
 295         si_pm4_set_reg(pm4, R_00B834_COMPUTE_PGM_HI, shader_va >> 40);
 296
 297         si_pm4_set_reg(pm4, R_00B848_COMPUTE_PGM_RSRC1,
 298                 /* We always use at least 3 VGPRS, these come from
 299                  * TIDIG_COMP_CNT.
 300                  * XXX: The compiler should account for this.
 301                  */
 302                 S_00B848_VGPRS((MAX2(3, shader->num_vgprs) - 1) / 4)
 303                 /* We always use at least 4 + arg_user_sgpr_count.  The 4 extra
 304                  * sgprs are from TGID_X_EN, TGID_Y_EN, TGID_Z_EN, TG_SIZE_EN
 305                  * XXX: The compiler should account for this.
 306                  */
 307                 |  S_00B848_SGPRS(((MAX2(4 + arg_user_sgpr_count,
 308                                         shader->num_sgprs)) - 1) / 8))
 309                 ;
 310
 311         lds_blocks = shader->lds_size;
 312         /* XXX: We are over allocating LDS.  For SI, the shader reports LDS in
 313          * blocks of 256 bytes, so if there are 4 bytes lds allocated in
 314          * the shader and 4 bytes allocated by the state tracker, then
 315          * we will set LDS_SIZE to 512 bytes rather than 256.
 316          */
 317         if (sctx->b.chip_class <= SI) {
 318                 lds_blocks += align(program->local_size, 256) >> 8;
 319         } else {
 320                 lds_blocks += align(program->local_size, 512) >> 9;
 321         }
 322
 323         assert(lds_blocks <= 0xFF);
 324
 325         si_pm4_set_reg(pm4, R_00B84C_COMPUTE_PGM_RSRC2,
 326                 S_00B84C_SCRATCH_EN(shader->scratch_bytes_per_wave > 0)
 327                 | S_00B84C_USER_SGPR(arg_user_sgpr_count)
 328                 | S_00B84C_TGID_X_EN(1)
 329                 | S_00B84C_TGID_Y_EN(1)
 330                 | S_00B84C_TGID_Z_EN(1)
 331                 | S_00B84C_TG_SIZE_EN(1)
 332                 | S_00B84C_TIDIG_COMP_CNT(2)
 333                 | S_00B84C_LDS_SIZE(lds_blocks)
 334                 | S_00B84C_EXCP_EN(0))
 335                 ;
 336         si_pm4_set_reg(pm4, R_00B854_COMPUTE_RESOURCE_LIMITS, 0);
 337
 338         si_pm4_set_reg(pm4, R_00B858_COMPUTE_STATIC_THREAD_MGMT_SE0,
 339                 S_00B858_SH0_CU_EN(0xffff /* Default value */)
 340                 | S_00B858_SH1_CU_EN(0xffff /* Default value */))
 341                 ;
 342
 343         si_pm4_set_reg(pm4, R_00B85C_COMPUTE_STATIC_THREAD_MGMT_SE1,
 344                 S_00B85C_SH0_CU_EN(0xffff /* Default value */)
 345                 | S_00B85C_SH1_CU_EN(0xffff /* Default value */))
 346                 ;
 347
 348         si_pm4_set_reg(pm4, R_00B860_COMPUTE_TMPRING_SIZE,
 349                 /* The maximum value for WAVES is 32 * num CU.
 350                  * If you program this value incorrectly, the GPU will hang if
 351                  * COMPUTE_PGM_RSRC2.SCRATCH_EN is enabled.
 352                  */
 353                 S_00B860_WAVES(num_waves_for_scratch)
 354                 | S_00B860_WAVESIZE(shader->scratch_bytes_per_wave >> 10))
 355                 ;
 356
 357         si_pm4_cmd_begin(pm4, PKT3_DISPATCH_DIRECT);
 358         si_pm4_cmd_add(pm4, grid_layout[0]); /* Thread groups DIM_X */
 359         si_pm4_cmd_add(pm4, grid_layout[1]); /* Thread groups DIM_Y */
 360         si_pm4_cmd_add(pm4, grid_layout[2]); /* Thread gropus DIM_Z */
 361         si_pm4_cmd_add(pm4, 1); /* DISPATCH_INITIATOR */
 362         si_pm4_cmd_end(pm4, false);
 363
 364         si_pm4_cmd_begin(pm4, PKT3_EVENT_WRITE);
 365         si_pm4_cmd_add(pm4, EVENT_TYPE(V_028A90_CS_PARTIAL_FLUSH | EVENT_INDEX(0x4)));
 366         si_pm4_cmd_end(pm4, false);
 367
 368         si_pm4_inval_texture_cache(pm4);
 369         si_pm4_inval_shader_cache(pm4);
 370         si_cmd_surface_sync(pm4, pm4->cp_coher_cntl);
 371
 372         si_pm4_emit(sctx, pm4);
 373
 374 #if 0
 375         fprintf(stderr, "cdw: %i\n", sctx->cs->cdw);
 376         for (i = 0; i < sctx->cs->cdw; i++) {
 377                 fprintf(stderr, "%4i : 0x%08X\n", i, sctx->cs->buf[i]);
 378         }
 379 #endif
 380
 381         si_pm4_free_state(sctx, pm4, ~0);
 382 }
 383
 384
 385 static void si_delete_compute_state(struct pipe_context *ctx, void* state){
 386         struct si_pipe_compute *program = (struct si_pipe_compute *)state;
 387
 388         if (!state) {
 389                 return;
 390         }
 391
 392         if (program->kernels) {
 393                 for (int i = 0; i < program->num_kernels; i++){
 394                         if (program->kernels[i].bo){
 395                                 si_pipe_shader_destroy(ctx, &program->kernels[i]);
 396                         }
 397                 }
 398                 FREE(program->kernels);
 399         }
 400
 401         if (program->llvm_ctx){
 402                 LLVMContextDispose(program->llvm_ctx);
 403         }
 404         pipe_resource_reference(
 405                 (struct pipe_resource **)&program->input_buffer, NULL);
 406
 407         //And then free the program itself.
 408         FREE(program);
 409 }
 410
 411 static void si_set_compute_resources(struct pipe_context * ctx_,
 412                 unsigned start, unsigned count,
 413                 struct pipe_surface ** surfaces) { }
 414
 415 void si_init_compute_functions(struct si_context *sctx)
 416 {
 417         sctx->b.b.create_compute_state = si_create_compute_state;
 418         sctx->b.b.delete_compute_state = si_delete_compute_state;
 419         sctx->b.b.bind_compute_state = si_bind_compute_state;
 420 /*       ctx->context.create_sampler_view = evergreen_compute_create_sampler_view; */
 421         sctx->b.b.set_compute_resources = si_set_compute_resources;
 422         sctx->b.b.set_global_binding = si_set_global_binding;
 423         sctx->b.b.launch_grid = si_launch_grid;
 424 }