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         int64_t abs_timeout = os_time_get_absolute_timeout(timeout);
 192
 193         if (!util_queue_fence_is_signalled(&rfence->ready)) {
 194                 if (!timeout)
 195                         return false;
 196
 197                 if (rfence->tc_token) {
 198                         /* Ensure that si_flush_from_st will be called for
 199                          * this fence, but only if we're in the API thread
 200                          * where the context is current.
 201                          *
 202                          * Note that the batch containing the flush may already
 203                          * be in flight in the driver thread, so the fence
 204                          * may not be ready yet when this call returns.
 205                          */
 206                         threaded_context_flush(ctx, rfence->tc_token,
 207                                                timeout == 0);
 208                 }
 209
 210                 if (timeout == PIPE_TIMEOUT_INFINITE) {
 211                         util_queue_fence_wait(&rfence->ready);
 212                 } else {
 213                         if (!util_queue_fence_wait_timeout(&rfence->ready, abs_timeout))
 214                                 return false;
 215                 }
 216
 217                 if (timeout && timeout != PIPE_TIMEOUT_INFINITE) {
 218                         int64_t time = os_time_get_nano();
 219                         timeout = abs_timeout > time ? abs_timeout - time : 0;
 220                 }
 221         }
 222
 223         if (rfence->sdma) {
 224                 if (!rws->fence_wait(rws, rfence->sdma, timeout))
 225                         return false;
 226
 227                 /* Recompute the timeout after waiting. */
 228                 if (timeout && timeout != PIPE_TIMEOUT_INFINITE) {
 229                         int64_t time = os_time_get_nano();
 230                         timeout = abs_timeout > time ? abs_timeout - time : 0;
 231                 }
 232         }
 233
 234         if (!rfence->gfx)
 235                 return true;
 236
 237         if (rfence->fine.buf &&
 238             si_fine_fence_signaled(rws, &rfence->fine)) {
 239                 rws->fence_reference(&rfence->gfx, NULL);
 240                 r600_resource_reference(&rfence->fine.buf, NULL);
 241                 return true;
 242         }
 243
 244         /* Flush the gfx IB if it hasn't been flushed yet. */
 245         if (ctx && rfence->gfx_unflushed.ctx) {
 246                 struct si_context *sctx;
 247
 248                 sctx = (struct si_context *)threaded_context_unwrap_unsync(ctx);
 249                 if (rfence->gfx_unflushed.ctx == &sctx->b &&
 250                     rfence->gfx_unflushed.ib_index == sctx->b.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                         threaded_context_unwrap_sync(ctx);
 274                         sctx->b.gfx.flush(&sctx->b, timeout ? 0 : RADEON_FLUSH_ASYNC, NULL);
 275                         rfence->gfx_unflushed.ctx = NULL;
 276
 277                         if (!timeout)
 278                                 return false;
 279
 280                         /* Recompute the timeout after all that. */
 281                         if (timeout && timeout != PIPE_TIMEOUT_INFINITE) {
 282                                 int64_t time = os_time_get_nano();
 283                                 timeout = abs_timeout > time ? abs_timeout - time : 0;
 284                         }
 285                 }
 286         }
 287
 288         if (rws->fence_wait(rws, rfence->gfx, timeout))
 289                 return true;
 290
 291         /* Re-check in case the GPU is slow or hangs, but the commands before
 292          * the fine-grained fence have completed. */
 293         if (rfence->fine.buf &&
 294             si_fine_fence_signaled(rws, &rfence->fine))
 295                 return true;
 296
 297         return false;
 298 }
 299
 300 static void si_create_fence_fd(struct pipe_context *ctx,
 301                                struct pipe_fence_handle **pfence, int fd)
 302 {
 303         struct r600_common_screen *rscreen = (struct r600_common_screen*)ctx->screen;
 304         struct radeon_winsys *ws = rscreen->ws;
 305         struct si_multi_fence *rfence;
 306
 307         *pfence = NULL;
 308
 309         if (!rscreen->info.has_sync_file)
 310                 return;
 311
 312         rfence = si_create_multi_fence();
 313         if (!rfence)
 314                 return;
 315
 316         rfence->gfx = ws->fence_import_sync_file(ws, fd);
 317         if (!rfence->gfx) {
 318                 FREE(rfence);
 319                 return;
 320         }
 321
 322         *pfence = (struct pipe_fence_handle*)rfence;
 323 }
 324
 325 static int si_fence_get_fd(struct pipe_screen *screen,
 326                            struct pipe_fence_handle *fence)
 327 {
 328         struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
 329         struct radeon_winsys *ws = rscreen->ws;
 330         struct si_multi_fence *rfence = (struct si_multi_fence *)fence;
 331         int gfx_fd = -1, sdma_fd = -1;
 332
 333         if (!rscreen->info.has_sync_file)
 334                 return -1;
 335
 336         util_queue_fence_wait(&rfence->ready);
 337
 338         /* Deferred fences aren't supported. */
 339         assert(!rfence->gfx_unflushed.ctx);
 340         if (rfence->gfx_unflushed.ctx)
 341                 return -1;
 342
 343         if (rfence->sdma) {
 344                 sdma_fd = ws->fence_export_sync_file(ws, rfence->sdma);
 345                 if (sdma_fd == -1)
 346                         return -1;
 347         }
 348         if (rfence->gfx) {
 349                 gfx_fd = ws->fence_export_sync_file(ws, rfence->gfx);
 350                 if (gfx_fd == -1) {
 351                         if (sdma_fd != -1)
 352                                 close(sdma_fd);
 353                         return -1;
 354                 }
 355         }
 356
 357         /* If we don't have FDs at this point, it means we don't have fences
 358          * either. */
 359         if (sdma_fd == -1)
 360                 return gfx_fd;
 361         if (gfx_fd == -1)
 362                 return sdma_fd;
 363
 364         /* Get a fence that will be a combination of both fences. */
 365         sync_accumulate("radeonsi", &gfx_fd, sdma_fd);
 366         close(sdma_fd);
 367         return gfx_fd;
 368 }
 369
 370 static void si_flush_from_st(struct pipe_context *ctx,
 371                              struct pipe_fence_handle **fence,
 372                              unsigned flags)
 373 {
 374         struct pipe_screen *screen = ctx->screen;
 375         struct r600_common_context *rctx = (struct r600_common_context *)ctx;
 376         struct radeon_winsys *ws = rctx->ws;
 377         struct pipe_fence_handle *gfx_fence = NULL;
 378         struct pipe_fence_handle *sdma_fence = NULL;
 379         bool deferred_fence = false;
 380         struct si_fine_fence fine = {};
 381         unsigned rflags = RADEON_FLUSH_ASYNC;
 382
 383         if (flags & PIPE_FLUSH_END_OF_FRAME)
 384                 rflags |= RADEON_FLUSH_END_OF_FRAME;
 385
 386         if (flags & (PIPE_FLUSH_TOP_OF_PIPE | PIPE_FLUSH_BOTTOM_OF_PIPE)) {
 387                 assert(flags & PIPE_FLUSH_DEFERRED);
 388                 assert(fence);
 389
 390                 si_fine_fence_set((struct si_context *)rctx, &fine, flags);
 391         }
 392
 393         /* DMA IBs are preambles to gfx IBs, therefore must be flushed first. */
 394         if (rctx->dma.cs)
 395                 rctx->dma.flush(rctx, rflags, fence ? &sdma_fence : NULL);
 396
 397         if (!radeon_emitted(rctx->gfx.cs, rctx->initial_gfx_cs_size)) {
 398                 if (fence)
 399                         ws->fence_reference(&gfx_fence, rctx->last_gfx_fence);
 400                 if (!(flags & PIPE_FLUSH_DEFERRED))
 401                         ws->cs_sync_flush(rctx->gfx.cs);
 402         } else {
 403                 /* Instead of flushing, create a deferred fence. Constraints:
 404                  * - The state tracker must allow a deferred flush.
 405                  * - The state tracker must request a fence.
 406                  * - fence_get_fd is not allowed.
 407                  * Thread safety in fence_finish must be ensured by the state tracker.
 408                  */
 409                 if (flags & PIPE_FLUSH_DEFERRED &&
 410                     !(flags & PIPE_FLUSH_FENCE_FD) &&
 411                     fence) {
 412                         gfx_fence = rctx->ws->cs_get_next_fence(rctx->gfx.cs);
 413                         deferred_fence = true;
 414                 } else {
 415                         rctx->gfx.flush(rctx, rflags, fence ? &gfx_fence : NULL);
 416                 }
 417         }
 418
 419         /* Both engines can signal out of order, so we need to keep both fences. */
 420         if (fence) {
 421                 struct si_multi_fence *multi_fence;
 422
 423                 if (flags & TC_FLUSH_ASYNC) {
 424                         multi_fence = (struct si_multi_fence *)*fence;
 425                         assert(multi_fence);
 426                 } else {
 427                         multi_fence = si_create_multi_fence();
 428                         if (!multi_fence) {
 429                                 ws->fence_reference(&sdma_fence, NULL);
 430                                 ws->fence_reference(&gfx_fence, NULL);
 431                                 goto finish;
 432                         }
 433
 434                         screen->fence_reference(screen, fence, NULL);
 435                         *fence = (struct pipe_fence_handle*)multi_fence;
 436                 }
 437
 438                 /* If both fences are NULL, fence_finish will always return true. */
 439                 multi_fence->gfx = gfx_fence;
 440                 multi_fence->sdma = sdma_fence;
 441
 442                 if (deferred_fence) {
 443                         multi_fence->gfx_unflushed.ctx = rctx;
 444                         multi_fence->gfx_unflushed.ib_index = rctx->num_gfx_cs_flushes;
 445                 }
 446
 447                 multi_fence->fine = fine;
 448
 449                 if (flags & TC_FLUSH_ASYNC) {
 450                         util_queue_fence_signal(&multi_fence->ready);
 451                         tc_unflushed_batch_token_reference(&multi_fence->tc_token, NULL);
 452                 }
 453         }
 454 finish:
 455         if (!(flags & PIPE_FLUSH_DEFERRED)) {
 456                 if (rctx->dma.cs)
 457                         ws->cs_sync_flush(rctx->dma.cs);
 458                 ws->cs_sync_flush(rctx->gfx.cs);
 459         }
 460 }
 461
 462 void si_init_fence_functions(struct si_context *ctx)
 463 {
 464         ctx->b.b.flush = si_flush_from_st;
 465         ctx->b.b.create_fence_fd = si_create_fence_fd;
 466         ctx->b.b.fence_server_sync = si_fence_server_sync;
 467 }
 468
 469 void si_init_screen_fence_functions(struct si_screen *screen)
 470 {
 471         screen->b.b.fence_finish = si_fence_finish;
 472         screen->b.b.fence_reference = si_fence_reference;
 473         screen->b.b.fence_get_fd = si_fence_get_fd;
 474 }