1 /* 2 * Copyright 2008 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric (at) anholt.net> 25 * Kenneth Graunke <kenneth (at) whitecape.org> 26 */ 27 28 /** @file gen6_queryobj.c 29 * 30 * Support for query objects (GL_ARB_occlusion_query, GL_ARB_timer_query, 31 * GL_EXT_transform_feedback, and friends) on platforms that support 32 * hardware contexts (Gen6+). 33 */ 34 #include "main/imports.h" 35 36 #include "brw_context.h" 37 #include "brw_defines.h" 38 #include "brw_state.h" 39 #include "intel_batchbuffer.h" 40 #include "intel_buffer_objects.h" 41 42 static inline void 43 set_query_availability(struct brw_context *brw, struct brw_query_object *query, 44 bool available) 45 { 46 /* For platforms that support ARB_query_buffer_object, we write the 47 * query availability for "pipelined" queries. 48 * 49 * Most counter snapshots are written by the command streamer, by 50 * doing a CS stall and then MI_STORE_REGISTER_MEM. For these 51 * counters, the CS stall guarantees that the results will be 52 * available when subsequent CS commands run. So we don't need to 53 * do any additional tracking. 54 * 55 * Other counters (occlusion queries and timestamp) are written by 56 * PIPE_CONTROL, without a CS stall. This means that we can't be 57 * sure whether the writes have landed yet or not. Performing a 58 * PIPE_CONTROL with an immediate write will synchronize with 59 * those earlier writes, so we write 1 when the value has landed. 60 */ 61 if (brw->ctx.Extensions.ARB_query_buffer_object && 62 brw_is_query_pipelined(query)) { 63 brw_emit_pipe_control_write(brw, 64 PIPE_CONTROL_WRITE_IMMEDIATE, 65 query->bo, 2 * sizeof(uint64_t), 66 available, 0); 67 } 68 } 69 70 static void 71 write_primitives_generated(struct brw_context *brw, 72 drm_intel_bo *query_bo, int stream, int idx) 73 { 74 brw_emit_mi_flush(brw); 75 76 if (brw->gen >= 7 && stream > 0) { 77 brw_store_register_mem64(brw, query_bo, 78 GEN7_SO_PRIM_STORAGE_NEEDED(stream), 79 idx * sizeof(uint64_t)); 80 } else { 81 brw_store_register_mem64(brw, query_bo, CL_INVOCATION_COUNT, 82 idx * sizeof(uint64_t)); 83 } 84 } 85 86 static void 87 write_xfb_primitives_written(struct brw_context *brw, 88 drm_intel_bo *bo, int stream, int idx) 89 { 90 brw_emit_mi_flush(brw); 91 92 if (brw->gen >= 7) { 93 brw_store_register_mem64(brw, bo, GEN7_SO_NUM_PRIMS_WRITTEN(stream), 94 idx * sizeof(uint64_t)); 95 } else { 96 brw_store_register_mem64(brw, bo, GEN6_SO_NUM_PRIMS_WRITTEN, 97 idx * sizeof(uint64_t)); 98 } 99 } 100 101 static inline int 102 pipeline_target_to_index(int target) 103 { 104 if (target == GL_GEOMETRY_SHADER_INVOCATIONS) 105 return MAX_PIPELINE_STATISTICS - 1; 106 else 107 return target - GL_VERTICES_SUBMITTED_ARB; 108 } 109 110 static void 111 emit_pipeline_stat(struct brw_context *brw, drm_intel_bo *bo, 112 int stream, int target, int idx) 113 { 114 /* One source of confusion is the tessellation shader statistics. The 115 * hardware has no statistics specific to the TE unit. Ideally we could have 116 * the HS primitives for TESS_CONTROL_SHADER_PATCHES_ARB, and the DS 117 * invocations as the register for TESS_CONTROL_SHADER_PATCHES_ARB. 118 * Unfortunately we don't have HS primitives, we only have HS invocations. 119 */ 120 121 /* Everything except GEOMETRY_SHADER_INVOCATIONS can be kept in a simple 122 * lookup table 123 */ 124 static const uint32_t target_to_register[] = { 125 IA_VERTICES_COUNT, /* VERTICES_SUBMITTED */ 126 IA_PRIMITIVES_COUNT, /* PRIMITIVES_SUBMITTED */ 127 VS_INVOCATION_COUNT, /* VERTEX_SHADER_INVOCATIONS */ 128 HS_INVOCATION_COUNT, /* TESS_CONTROL_SHADER_PATCHES */ 129 DS_INVOCATION_COUNT, /* TESS_EVALUATION_SHADER_INVOCATIONS */ 130 GS_PRIMITIVES_COUNT, /* GEOMETRY_SHADER_PRIMITIVES_EMITTED */ 131 PS_INVOCATION_COUNT, /* FRAGMENT_SHADER_INVOCATIONS */ 132 CS_INVOCATION_COUNT, /* COMPUTE_SHADER_INVOCATIONS */ 133 CL_INVOCATION_COUNT, /* CLIPPING_INPUT_PRIMITIVES */ 134 CL_PRIMITIVES_COUNT, /* CLIPPING_OUTPUT_PRIMITIVES */ 135 GS_INVOCATION_COUNT /* This one is special... */ 136 }; 137 STATIC_ASSERT(ARRAY_SIZE(target_to_register) == MAX_PIPELINE_STATISTICS); 138 uint32_t reg = target_to_register[pipeline_target_to_index(target)]; 139 /* Gen6 GS code counts full primitives, that is, it won't count individual 140 * triangles in a triangle strip. Use CL_INVOCATION_COUNT for that. 141 */ 142 if (brw->gen == 6 && target == GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB) 143 reg = CL_INVOCATION_COUNT; 144 assert(reg != 0); 145 146 /* Emit a flush to make sure various parts of the pipeline are complete and 147 * we get an accurate value 148 */ 149 brw_emit_mi_flush(brw); 150 151 brw_store_register_mem64(brw, bo, reg, idx * sizeof(uint64_t)); 152 } 153 154 155 /** 156 * Wait on the query object's BO and calculate the final result. 157 */ 158 static void 159 gen6_queryobj_get_results(struct gl_context *ctx, 160 struct brw_query_object *query) 161 { 162 struct brw_context *brw = brw_context(ctx); 163 164 if (query->bo == NULL) 165 return; 166 167 brw_bo_map(brw, query->bo, false, "query object"); 168 uint64_t *results = query->bo->virtual; 169 switch (query->Base.Target) { 170 case GL_TIME_ELAPSED: 171 /* The query BO contains the starting and ending timestamps. 172 * Subtract the two and convert to nanoseconds. 173 */ 174 query->Base.Result += 80 * (results[1] - results[0]); 175 break; 176 177 case GL_TIMESTAMP: 178 /* Our timer is a clock that increments every 80ns (regardless of 179 * other clock scaling in the system). The timestamp register we can 180 * read for glGetTimestamp() masks out the top 32 bits, so we do that 181 * here too to let the two counters be compared against each other. 182 * 183 * If we just multiplied that 32 bits of data by 80, it would roll 184 * over at a non-power-of-two, so an application couldn't use 185 * GL_QUERY_COUNTER_BITS to handle rollover correctly. Instead, we 186 * report 36 bits and truncate at that (rolling over 5 times as often 187 * as the HW counter), and when the 32-bit counter rolls over, it 188 * happens to also be at a rollover in the reported value from near 189 * (1<<36) to 0. 190 * 191 * The low 32 bits rolls over in ~343 seconds. Our 36-bit result 192 * rolls over every ~69 seconds. 193 * 194 * The query BO contains a single timestamp value in results[0]. 195 */ 196 query->Base.Result = 80 * (results[0] & 0xffffffff); 197 query->Base.Result &= (1ull << 36) - 1; 198 break; 199 200 case GL_SAMPLES_PASSED_ARB: 201 /* We need to use += rather than = here since some BLT-based operations 202 * may have added additional samples to our occlusion query value. 203 */ 204 query->Base.Result += results[1] - results[0]; 205 break; 206 207 case GL_ANY_SAMPLES_PASSED: 208 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: 209 if (results[0] != results[1]) 210 query->Base.Result = true; 211 break; 212 213 case GL_PRIMITIVES_GENERATED: 214 case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: 215 case GL_VERTICES_SUBMITTED_ARB: 216 case GL_PRIMITIVES_SUBMITTED_ARB: 217 case GL_VERTEX_SHADER_INVOCATIONS_ARB: 218 case GL_GEOMETRY_SHADER_INVOCATIONS: 219 case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB: 220 case GL_CLIPPING_INPUT_PRIMITIVES_ARB: 221 case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB: 222 case GL_COMPUTE_SHADER_INVOCATIONS_ARB: 223 case GL_TESS_CONTROL_SHADER_PATCHES_ARB: 224 case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB: 225 query->Base.Result = results[1] - results[0]; 226 break; 227 228 case GL_FRAGMENT_SHADER_INVOCATIONS_ARB: 229 query->Base.Result = (results[1] - results[0]); 230 /* Implement the "WaDividePSInvocationCountBy4:HSW,BDW" workaround: 231 * "Invocation counter is 4 times actual. WA: SW to divide HW reported 232 * PS Invocations value by 4." 233 * 234 * Prior to Haswell, invocation count was counted by the WM, and it 235 * buggily counted invocations in units of subspans (2x2 unit). To get the 236 * correct value, the CS multiplied this by 4. With HSW the logic moved, 237 * and correctly emitted the number of pixel shader invocations, but, 238 * whomever forgot to undo the multiply by 4. 239 */ 240 if (brw->gen == 8 || brw->is_haswell) 241 query->Base.Result /= 4; 242 break; 243 244 default: 245 unreachable("Unrecognized query target in brw_queryobj_get_results()"); 246 } 247 drm_intel_bo_unmap(query->bo); 248 249 /* Now that we've processed the data stored in the query's buffer object, 250 * we can release it. 251 */ 252 drm_intel_bo_unreference(query->bo); 253 query->bo = NULL; 254 255 query->Base.Ready = true; 256 } 257 258 /** 259 * Driver hook for glBeginQuery(). 260 * 261 * Initializes driver structures and emits any GPU commands required to begin 262 * recording data for the query. 263 */ 264 static void 265 gen6_begin_query(struct gl_context *ctx, struct gl_query_object *q) 266 { 267 struct brw_context *brw = brw_context(ctx); 268 struct brw_query_object *query = (struct brw_query_object *)q; 269 270 /* Since we're starting a new query, we need to throw away old results. */ 271 drm_intel_bo_unreference(query->bo); 272 query->bo = drm_intel_bo_alloc(brw->bufmgr, "query results", 4096, 4096); 273 274 /* For ARB_query_buffer_object: The result is not available */ 275 set_query_availability(brw, query, false); 276 277 switch (query->Base.Target) { 278 case GL_TIME_ELAPSED: 279 /* For timestamp queries, we record the starting time right away so that 280 * we measure the full time between BeginQuery and EndQuery. There's 281 * some debate about whether this is the right thing to do. Our decision 282 * is based on the following text from the ARB_timer_query extension: 283 * 284 * "(5) Should the extension measure total time elapsed between the full 285 * completion of the BeginQuery and EndQuery commands, or just time 286 * spent in the graphics library? 287 * 288 * RESOLVED: This extension will measure the total time elapsed 289 * between the full completion of these commands. Future extensions 290 * may implement a query to determine time elapsed at different stages 291 * of the graphics pipeline." 292 * 293 * We write a starting timestamp now (at index 0). At EndQuery() time, 294 * we'll write a second timestamp (at index 1), and subtract the two to 295 * obtain the time elapsed. Notably, this includes time elapsed while 296 * the system was doing other work, such as running other applications. 297 */ 298 brw_write_timestamp(brw, query->bo, 0); 299 break; 300 301 case GL_ANY_SAMPLES_PASSED: 302 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: 303 case GL_SAMPLES_PASSED_ARB: 304 brw_write_depth_count(brw, query->bo, 0); 305 break; 306 307 case GL_PRIMITIVES_GENERATED: 308 write_primitives_generated(brw, query->bo, query->Base.Stream, 0); 309 if (query->Base.Stream == 0) 310 ctx->NewDriverState |= BRW_NEW_RASTERIZER_DISCARD; 311 break; 312 313 case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: 314 write_xfb_primitives_written(brw, query->bo, query->Base.Stream, 0); 315 break; 316 317 case GL_VERTICES_SUBMITTED_ARB: 318 case GL_PRIMITIVES_SUBMITTED_ARB: 319 case GL_VERTEX_SHADER_INVOCATIONS_ARB: 320 case GL_GEOMETRY_SHADER_INVOCATIONS: 321 case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB: 322 case GL_FRAGMENT_SHADER_INVOCATIONS_ARB: 323 case GL_CLIPPING_INPUT_PRIMITIVES_ARB: 324 case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB: 325 case GL_COMPUTE_SHADER_INVOCATIONS_ARB: 326 case GL_TESS_CONTROL_SHADER_PATCHES_ARB: 327 case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB: 328 emit_pipeline_stat(brw, query->bo, query->Base.Stream, query->Base.Target, 0); 329 break; 330 331 default: 332 unreachable("Unrecognized query target in brw_begin_query()"); 333 } 334 } 335 336 /** 337 * Driver hook for glEndQuery(). 338 * 339 * Emits GPU commands to record a final query value, ending any data capturing. 340 * However, the final result isn't necessarily available until the GPU processes 341 * those commands. brw_queryobj_get_results() processes the captured data to 342 * produce the final result. 343 */ 344 static void 345 gen6_end_query(struct gl_context *ctx, struct gl_query_object *q) 346 { 347 struct brw_context *brw = brw_context(ctx); 348 struct brw_query_object *query = (struct brw_query_object *)q; 349 350 switch (query->Base.Target) { 351 case GL_TIME_ELAPSED: 352 brw_write_timestamp(brw, query->bo, 1); 353 break; 354 355 case GL_ANY_SAMPLES_PASSED: 356 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE: 357 case GL_SAMPLES_PASSED_ARB: 358 brw_write_depth_count(brw, query->bo, 1); 359 break; 360 361 case GL_PRIMITIVES_GENERATED: 362 write_primitives_generated(brw, query->bo, query->Base.Stream, 1); 363 if (query->Base.Stream == 0) 364 ctx->NewDriverState |= BRW_NEW_RASTERIZER_DISCARD; 365 break; 366 367 case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: 368 write_xfb_primitives_written(brw, query->bo, query->Base.Stream, 1); 369 break; 370 371 case GL_VERTICES_SUBMITTED_ARB: 372 case GL_PRIMITIVES_SUBMITTED_ARB: 373 case GL_VERTEX_SHADER_INVOCATIONS_ARB: 374 case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB: 375 case GL_FRAGMENT_SHADER_INVOCATIONS_ARB: 376 case GL_COMPUTE_SHADER_INVOCATIONS_ARB: 377 case GL_CLIPPING_INPUT_PRIMITIVES_ARB: 378 case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB: 379 case GL_GEOMETRY_SHADER_INVOCATIONS: 380 case GL_TESS_CONTROL_SHADER_PATCHES_ARB: 381 case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB: 382 emit_pipeline_stat(brw, query->bo, 383 query->Base.Stream, query->Base.Target, 1); 384 break; 385 386 default: 387 unreachable("Unrecognized query target in brw_end_query()"); 388 } 389 390 /* The current batch contains the commands to handle EndQuery(), 391 * but they won't actually execute until it is flushed. 392 */ 393 query->flushed = false; 394 395 /* For ARB_query_buffer_object: The result is now available */ 396 set_query_availability(brw, query, true); 397 } 398 399 /** 400 * Flush the batch if it still references the query object BO. 401 */ 402 static void 403 flush_batch_if_needed(struct brw_context *brw, struct brw_query_object *query) 404 { 405 /* If the batch doesn't reference the BO, it must have been flushed 406 * (for example, due to being full). Record that it's been flushed. 407 */ 408 query->flushed = query->flushed || 409 !drm_intel_bo_references(brw->batch.bo, query->bo); 410 411 if (!query->flushed) 412 intel_batchbuffer_flush(brw); 413 } 414 415 /** 416 * The WaitQuery() driver hook. 417 * 418 * Wait for a query result to become available and return it. This is the 419 * backing for glGetQueryObjectiv() with the GL_QUERY_RESULT pname. 420 */ 421 static void gen6_wait_query(struct gl_context *ctx, struct gl_query_object *q) 422 { 423 struct brw_context *brw = brw_context(ctx); 424 struct brw_query_object *query = (struct brw_query_object *)q; 425 426 /* If the application has requested the query result, but this batch is 427 * still contributing to it, flush it now to finish that work so the 428 * result will become available (eventually). 429 */ 430 flush_batch_if_needed(brw, query); 431 432 gen6_queryobj_get_results(ctx, query); 433 } 434 435 /** 436 * The CheckQuery() driver hook. 437 * 438 * Checks whether a query result is ready yet. If not, flushes. 439 * This is the backing for glGetQueryObjectiv()'s QUERY_RESULT_AVAILABLE pname. 440 */ 441 static void gen6_check_query(struct gl_context *ctx, struct gl_query_object *q) 442 { 443 struct brw_context *brw = brw_context(ctx); 444 struct brw_query_object *query = (struct brw_query_object *)q; 445 446 /* If query->bo is NULL, we've already gathered the results - this is a 447 * redundant CheckQuery call. Ignore it. 448 */ 449 if (query->bo == NULL) 450 return; 451 452 /* From the GL_ARB_occlusion_query spec: 453 * 454 * "Instead of allowing for an infinite loop, performing a 455 * QUERY_RESULT_AVAILABLE_ARB will perform a flush if the result is 456 * not ready yet on the first time it is queried. This ensures that 457 * the async query will return true in finite time. 458 */ 459 flush_batch_if_needed(brw, query); 460 461 if (!drm_intel_bo_busy(query->bo)) { 462 gen6_queryobj_get_results(ctx, query); 463 } 464 } 465 466 static void 467 gen6_query_counter(struct gl_context *ctx, struct gl_query_object *q) 468 { 469 struct brw_context *brw = brw_context(ctx); 470 struct brw_query_object *query = (struct brw_query_object *)q; 471 brw_query_counter(ctx, q); 472 set_query_availability(brw, query, true); 473 } 474 475 /* Initialize Gen6+-specific query object functions. */ 476 void gen6_init_queryobj_functions(struct dd_function_table *functions) 477 { 478 functions->BeginQuery = gen6_begin_query; 479 functions->EndQuery = gen6_end_query; 480 functions->CheckQuery = gen6_check_query; 481 functions->WaitQuery = gen6_wait_query; 482 functions->QueryCounter = gen6_query_counter; 483 } 484
