src/gallium/drivers/radeonsi/si_fence.c

   1 /*
   2  * Copyright 2013-2017 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  * 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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  */
  24
  25 #include <libsync.h>
  26
  27 #include "util/os_time.h"
  28 #include "util/u_memory.h"
  29 #include "util/u_queue.h"
  30 #include "util/u_upload_mgr.h"
  31
  32 #include "si_pipe.h"
  33 #include "radeon/r600_cs.h"
  34
  35 struct si_fine_fence {
  36         struct r600_resource *buf;
  37         unsigned offset;
  38 };
  39
  40 struct si_multi_fence {
  41         struct pipe_reference reference;
  42         struct pipe_fence_handle *gfx;
  43         struct pipe_fence_handle *sdma;
  44         struct tc_unflushed_batch_token *tc_token;
  45         struct util_queue_fence ready;
  46
  47         /* If the context wasn't flushed at fence creation, this is non-NULL. */
  48         struct {
  49                 struct r600_common_context *ctx;
  50                 unsigned ib_index;
  51         } gfx_unflushed;
  52
  53         struct si_fine_fence fine;
  54 };
  55
  56 static void si_add_fence_dependency(struct r600_common_context *rctx,
  57                                     struct pipe_fence_handle *fence)
  58 {
  59         struct radeon_winsys *ws = rctx->ws;
  60
  61         if (rctx->dma.cs)
  62                 ws->cs_add_fence_dependency(rctx->dma.cs, fence);
  63         ws->cs_add_fence_dependency(rctx->gfx.cs, fence);
  64 }
  65
  66 static void si_fence_reference(struct pipe_screen *screen,
  67                                struct pipe_fence_handle **dst,
  68                                struct pipe_fence_handle *src)
  69 {
  70         struct radeon_winsys *ws = ((struct r600_common_screen*)screen)->ws;
  71         struct si_multi_fence **rdst = (struct si_multi_fence **)dst;
  72         struct si_multi_fence *rsrc = (struct si_multi_fence *)src;
  73
  74         if (pipe_reference(&(*rdst)->reference, &rsrc->reference)) {
  75                 ws->fence_reference(&(*rdst)->gfx, NULL);
  76                 ws->fence_reference(&(*rdst)->sdma, NULL);
  77                 tc_unflushed_batch_token_reference(&(*rdst)->tc_token, NULL);
  78                 r600_resource_reference(&(*rdst)->fine.buf, NULL);
  79                 FREE(*rdst);
  80         }
  81         *rdst = rsrc;
  82 }
  83
  84 static struct si_multi_fence *si_create_multi_fence()
  85 {
  86         struct si_multi_fence *fence = CALLOC_STRUCT(si_multi_fence);
  87         if (!fence)
  88                 return NULL;
  89
  90         pipe_reference_init(&fence->reference, 1);
  91         util_queue_fence_init(&fence->ready);
  92
  93         return fence;
  94 }
  95
  96 struct pipe_fence_handle *si_create_fence(struct pipe_context *ctx,
  97                                           struct tc_unflushed_batch_token *tc_token)
  98 {
  99         struct si_multi_fence *fence = si_create_multi_fence();
 100         if (!fence)
 101                 return NULL;
 102
 103         util_queue_fence_reset(&fence->ready);
 104         tc_unflushed_batch_token_reference(&fence->tc_token, tc_token);
 105
 106         return (struct pipe_fence_handle *)fence;
 107 }
 108
 109 static void si_fence_server_sync(struct pipe_context *ctx,
 110                                  struct pipe_fence_handle *fence)
 111 {
 112         struct r600_common_context *rctx = (struct r600_common_context *)ctx;
 113         struct si_multi_fence *rfence = (struct si_multi_fence *)fence;
 114
 115         util_queue_fence_wait(&rfence->ready);
 116
 117         /* Unflushed fences from the same context are no-ops. */
 118         if (rfence->gfx_unflushed.ctx &&
 119             rfence->gfx_unflushed.ctx == rctx)
 120                 return;
 121
 122         /* All unflushed commands will not start execution before
 123          * this fence dependency is signalled.
 124          *
 125          * Should we flush the context to allow more GPU parallelism?
 126          */
 127         if (rfence->sdma)
 128                 si_add_fence_dependency(rctx, rfence->sdma);
 129         if (rfence->gfx)
 130                 si_add_fence_dependency(rctx, rfence->gfx);
 131 }
 132
 133 static bool si_fine_fence_signaled(struct radeon_winsys *rws,
 134                                    const struct si_fine_fence *fine)
 135 {
 136         char *map = rws->buffer_map(fine->buf->buf, NULL, PIPE_TRANSFER_READ |
 137                                                           PIPE_TRANSFER_UNSYNCHRONIZED);
 138         if (!map)
 139                 return false;
 140
 141         uint32_t *fence = (uint32_t*)(map + fine->offset);
 142         return *fence != 0;
 143 }
 144
 145 static void si_fine_fence_set(struct si_context *ctx,
 146                               struct si_fine_fence *fine,
 147                               unsigned flags)
 148 {
 149         uint32_t *fence_ptr;
 150
 151         assert(util_bitcount(flags & (PIPE_FLUSH_TOP_OF_PIPE | PIPE_FLUSH_BOTTOM_OF_PIPE)) == 1);
 152
 153         /* Use uncached system memory for the fence. */
 154         u_upload_alloc(ctx->b.b.stream_uploader, 0, 4, 4,
 155                        &fine->offset, (struct pipe_resource **)&fine->buf, (void **)&fence_ptr);
 156         if (!fine->buf)
 157                 return;
 158
 159         *fence_ptr = 0;
 160
 161         uint64_t fence_va = fine->buf->gpu_address + fine->offset;
 162
 163         radeon_add_to_buffer_list(&ctx->b, &ctx->b.gfx, fine->buf,
 164                                   RADEON_USAGE_WRITE, RADEON_PRIO_QUERY);
 165         if (flags & PIPE_FLUSH_TOP_OF_PIPE) {
 166                 struct radeon_winsys_cs *cs = ctx->b.gfx.cs;
 167                 radeon_emit(cs, PKT3(PKT3_WRITE_DATA, 3, 0));
 168                 radeon_emit(cs, S_370_DST_SEL(V_370_MEM_ASYNC) |
 169                         S_370_WR_CONFIRM(1) |
 170                         S_370_ENGINE_SEL(V_370_PFP));
 171                 radeon_emit(cs, fence_va);
 172                 radeon_emit(cs, fence_va >> 32);
 173                 radeon_emit(cs, 0x80000000);
 174         } else if (flags & PIPE_FLUSH_BOTTOM_OF_PIPE) {
 175                 si_gfx_write_event_eop(&ctx->b, V_028A90_BOTTOM_OF_PIPE_TS, 0,
 176                                        EOP_DATA_SEL_VALUE_32BIT,
 177                                        NULL, fence_va, 0x80000000,
 178                                        PIPE_QUERY_GPU_FINISHED);
 179         } else {
 180                 assert(false);
 181         }
 182 }
 183
 184 static boolean si_fence_finish(struct pipe_screen *screen,
 185                                struct pipe_context *ctx,
 186                                struct pipe_fence_handle *fence,
 187                                uint64_t timeout)
 188 {
 189         struct radeon_winsys *rws = ((struct r600_common_screen*)screen)->ws;
 190         struct si_multi_fence *rfence = (struct si_multi_fence *)fence;
 191         struct r600_common_context *rctx;
 192         int64_t abs_timeout = os_time_get_absolute_timeout(timeout);
 193
 194         ctx = threaded_context_unwrap_sync(ctx);
 195         rctx = ctx ? (struct r600_common_context*)ctx : NULL;
 196
 197         if (!util_queue_fence_is_signalled(&rfence->ready)) {
 198                 if (!timeout)
 199                         return false;
 200
 201                 if (rfence->tc_token) {
 202                         /* Ensure that si_flush_from_st will be called for
 203                          * this fence, but only if we're in the API thread
 204                          * where the context is current.
 205                          *
 206                          * Note that the batch containing the flush may already
 207                          * be in flight in the driver thread, so the fence
 208                          * may not be ready yet when this call returns.
 209                          */
 210                         threaded_context_flush(ctx, rfence->tc_token);
 211                 }
 212
 213                 if (timeout == PIPE_TIMEOUT_INFINITE) {
 214                         util_queue_fence_wait(&rfence->ready);
 215                 } else {
 216                         if (!util_queue_fence_wait_timeout(&rfence->ready, abs_timeout))
 217                                 return false;
 218                 }
 219
 220                 if (timeout && timeout != PIPE_TIMEOUT_INFINITE) {
 221                         int64_t time = os_time_get_nano();
 222                         timeout = abs_timeout > time ? abs_timeout - time : 0;
 223                 }
 224         }
 225
 226         if (rfence->sdma) {
 227                 if (!rws->fence_wait(rws, rfence->sdma, timeout))
 228                         return false;
 229
 230                 /* Recompute the timeout after waiting. */
 231                 if (timeout && timeout != PIPE_TIMEOUT_INFINITE) {
 232                         int64_t time = os_time_get_nano();
 233                         timeout = abs_timeout > time ? abs_timeout - time : 0;
 234                 }
 235         }
 236
 237         if (!rfence->gfx)
 238                 return true;
 239
 240         if (rfence->fine.buf &&
 241             si_fine_fence_signaled(rws, &rfence->fine)) {
 242                 rws->fence_reference(&rfence->gfx, NULL);
 243                 r600_resource_reference(&rfence->fine.buf, NULL);
 244                 return true;
 245         }
 246
 247         /* Flush the gfx IB if it hasn't been flushed yet. */
 248         if (rctx &&
 249             rfence->gfx_unflushed.ctx == rctx &&
 250             rfence->gfx_unflushed.ib_index == rctx->num_gfx_cs_flushes) {
 251                 /* Section 4.1.2 (Signaling) of the OpenGL 4.6 (Core profile)
 252                  * spec says:
 253                  *
 254                  *    "If the sync object being blocked upon will not be
 255                  *     signaled in finite time (for example, by an associated
 256                  *     fence command issued previously, but not yet flushed to
 257                  *     the graphics pipeline), then ClientWaitSync may hang
 258                  *     forever. To help prevent this behavior, if
 259                  *     ClientWaitSync is called and all of the following are
 260                  *     true:
 261                  *
 262                  *     * the SYNC_FLUSH_COMMANDS_BIT bit is set in flags,
 263                  *     * sync is unsignaled when ClientWaitSync is called,
 264                  *     * and the calls to ClientWaitSync and FenceSync were
 265                  *       issued from the same context,
 266                  *
 267                  *     then the GL will behave as if the equivalent of Flush
 268                  *     were inserted immediately after the creation of sync."
 269                  *
 270                  * This means we need to flush for such fences even when we're
 271                  * not going to wait.
 272                  */
 273                 rctx->gfx.flush(rctx, timeout ? 0 : RADEON_FLUSH_ASYNC, NULL);
 274                 rfence->gfx_unflushed.ctx = NULL;
 275
 276                 if (!timeout)
 277                         return false;
 278
 279                 /* Recompute the timeout after all that. */
 280                 if (timeout && timeout != PIPE_TIMEOUT_INFINITE) {
 281                         int64_t time = os_time_get_nano();
 282                         timeout = abs_timeout > time ? abs_timeout - time : 0;
 283                 }
 284         }
 285
 286         if (rws->fence_wait(rws, rfence->gfx, timeout))
 287                 return true;
 288
 289         /* Re-check in case the GPU is slow or hangs, but the commands before
 290          * the fine-grained fence have completed. */
 291         if (rfence->fine.buf &&
 292             si_fine_fence_signaled(rws, &rfence->fine))
 293                 return true;
 294
 295         return false;
 296 }
 297
 298 static void si_create_fence_fd(struct pipe_context *ctx,
 299                                struct pipe_fence_handle **pfence, int fd)
 300 {
 301         struct r600_common_screen *rscreen = (struct r600_common_screen*)ctx->screen;
 302         struct radeon_winsys *ws = rscreen->ws;
 303         struct si_multi_fence *rfence;
 304
 305         *pfence = NULL;
 306
 307         if (!rscreen->info.has_sync_file)
 308                 return;
 309
 310         rfence = si_create_multi_fence();
 311         if (!rfence)
 312                 return;
 313
 314         rfence->gfx = ws->fence_import_sync_file(ws, fd);
 315         if (!rfence->gfx) {
 316                 FREE(rfence);
 317                 return;
 318         }
 319
 320         *pfence = (struct pipe_fence_handle*)rfence;
 321 }
 322
 323 static int si_fence_get_fd(struct pipe_screen *screen,
 324                            struct pipe_fence_handle *fence)
 325 {
 326         struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
 327         struct radeon_winsys *ws = rscreen->ws;
 328         struct si_multi_fence *rfence = (struct si_multi_fence *)fence;
 329         int gfx_fd = -1, sdma_fd = -1;
 330
 331         if (!rscreen->info.has_sync_file)
 332                 return -1;
 333
 334         util_queue_fence_wait(&rfence->ready);
 335
 336         /* Deferred fences aren't supported. */
 337         assert(!rfence->gfx_unflushed.ctx);
 338         if (rfence->gfx_unflushed.ctx)
 339                 return -1;
 340
 341         if (rfence->sdma) {
 342                 sdma_fd = ws->fence_export_sync_file(ws, rfence->sdma);
 343                 if (sdma_fd == -1)
 344                         return -1;
 345         }
 346         if (rfence->gfx) {
 347                 gfx_fd = ws->fence_export_sync_file(ws, rfence->gfx);
 348                 if (gfx_fd == -1) {
 349                         if (sdma_fd != -1)
 350                                 close(sdma_fd);
 351                         return -1;
 352                 }
 353         }
 354
 355         /* If we don't have FDs at this point, it means we don't have fences
 356          * either. */
 357         if (sdma_fd == -1)
 358                 return gfx_fd;
 359         if (gfx_fd == -1)
 360                 return sdma_fd;
 361
 362         /* Get a fence that will be a combination of both fences. */
 363         sync_accumulate("radeonsi", &gfx_fd, sdma_fd);
 364         close(sdma_fd);
 365         return gfx_fd;
 366 }
 367
 368 static void si_flush_from_st(struct pipe_context *ctx,
 369                              struct pipe_fence_handle **fence,
 370                              unsigned flags)
 371 {
 372         struct pipe_screen *screen = ctx->screen;
 373         struct r600_common_context *rctx = (struct r600_common_context *)ctx;
 374         struct radeon_winsys *ws = rctx->ws;
 375         struct pipe_fence_handle *gfx_fence = NULL;
 376         struct pipe_fence_handle *sdma_fence = NULL;
 377         bool deferred_fence = false;
 378         struct si_fine_fence fine = {};
 379         unsigned rflags = RADEON_FLUSH_ASYNC;
 380
 381         if (flags & PIPE_FLUSH_END_OF_FRAME)
 382                 rflags |= RADEON_FLUSH_END_OF_FRAME;
 383
 384         if (flags & (PIPE_FLUSH_TOP_OF_PIPE | PIPE_FLUSH_BOTTOM_OF_PIPE)) {
 385                 assert(flags & PIPE_FLUSH_DEFERRED);
 386                 assert(fence);
 387
 388                 si_fine_fence_set((struct si_context *)rctx, &fine, flags);
 389         }
 390
 391         /* DMA IBs are preambles to gfx IBs, therefore must be flushed first. */
 392         if (rctx->dma.cs)
 393                 rctx->dma.flush(rctx, rflags, fence ? &sdma_fence : NULL);
 394
 395         if (!radeon_emitted(rctx->gfx.cs, rctx->initial_gfx_cs_size)) {
 396                 if (fence)
 397                         ws->fence_reference(&gfx_fence, rctx->last_gfx_fence);
 398                 if (!(flags & PIPE_FLUSH_DEFERRED))
 399                         ws->cs_sync_flush(rctx->gfx.cs);
 400         } else {
 401                 /* Instead of flushing, create a deferred fence. Constraints:
 402                  * - The state tracker must allow a deferred flush.
 403                  * - The state tracker must request a fence.
 404                  * - fence_get_fd is not allowed.
 405                  * Thread safety in fence_finish must be ensured by the state tracker.
 406                  */
 407                 if (flags & PIPE_FLUSH_DEFERRED &&
 408                     !(flags & PIPE_FLUSH_FENCE_FD) &&
 409                     fence) {
 410                         gfx_fence = rctx->ws->cs_get_next_fence(rctx->gfx.cs);
 411                         deferred_fence = true;
 412                 } else {
 413                         rctx->gfx.flush(rctx, rflags, fence ? &gfx_fence : NULL);
 414                 }
 415         }
 416
 417         /* Both engines can signal out of order, so we need to keep both fences. */
 418         if (fence) {
 419                 struct si_multi_fence *multi_fence;
 420
 421                 if (flags & TC_FLUSH_ASYNC) {
 422                         multi_fence = (struct si_multi_fence *)*fence;
 423                         assert(multi_fence);
 424                 } else {
 425                         multi_fence = si_create_multi_fence();
 426                         if (!multi_fence) {
 427                                 ws->fence_reference(&sdma_fence, NULL);
 428                                 ws->fence_reference(&gfx_fence, NULL);
 429                                 goto finish;
 430                         }
 431
 432                         screen->fence_reference(screen, fence, NULL);
 433                         *fence = (struct pipe_fence_handle*)multi_fence;
 434                 }
 435
 436                 /* If both fences are NULL, fence_finish will always return true. */
 437                 multi_fence->gfx = gfx_fence;
 438                 multi_fence->sdma = sdma_fence;
 439
 440                 if (deferred_fence) {
 441                         multi_fence->gfx_unflushed.ctx = rctx;
 442                         multi_fence->gfx_unflushed.ib_index = rctx->num_gfx_cs_flushes;
 443                 }
 444
 445                 multi_fence->fine = fine;
 446
 447                 if (flags & TC_FLUSH_ASYNC) {
 448                         util_queue_fence_signal(&multi_fence->ready);
 449                         tc_unflushed_batch_token_reference(&multi_fence->tc_token, NULL);
 450                 }
 451         }
 452 finish:
 453         if (!(flags & PIPE_FLUSH_DEFERRED)) {
 454                 if (rctx->dma.cs)
 455                         ws->cs_sync_flush(rctx->dma.cs);
 456                 ws->cs_sync_flush(rctx->gfx.cs);
 457         }
 458 }
 459
 460 void si_init_fence_functions(struct si_context *ctx)
 461 {
 462         ctx->b.b.flush = si_flush_from_st;
 463         ctx->b.b.create_fence_fd = si_create_fence_fd;
 464         ctx->b.b.fence_server_sync = si_fence_server_sync;
 465 }
 466
 467 void si_init_screen_fence_functions(struct si_screen *screen)
 468 {
 469         screen->b.b.fence_finish = si_fence_finish;
 470         screen->b.b.fence_reference = si_fence_reference;
 471         screen->b.b.fence_get_fd = si_fence_get_fd;
 472 }