src/gallium/drivers/iris/iris_fence.c

   1 /*
   2  * Copyright © 2018 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_fence.c
  25  *
  26  * Fences for driver and IPC serialisation, scheduling and synchronisation.
  27  */
  28
  29 #include <linux/sync_file.h>
  30
  31 #include "util/u_inlines.h"
  32 #include "intel/common/gen_gem.h"
  33
  34 #include "iris_batch.h"
  35 #include "iris_bufmgr.h"
  36 #include "iris_context.h"
  37 #include "iris_fence.h"
  38 #include "iris_screen.h"
  39
  40 static uint32_t
  41 gem_syncobj_create(int fd, uint32_t flags)
  42 {
  43    struct drm_syncobj_create args = {
  44       .flags = flags,
  45    };
  46
  47    gen_ioctl(fd, DRM_IOCTL_SYNCOBJ_CREATE, &args);
  48
  49    return args.handle;
  50 }
  51
  52 static void
  53 gem_syncobj_destroy(int fd, uint32_t handle)
  54 {
  55    struct drm_syncobj_destroy args = {
  56       .handle = handle,
  57    };
  58
  59    gen_ioctl(fd, DRM_IOCTL_SYNCOBJ_DESTROY, &args);
  60 }
  61
  62 /**
  63  * Make a new sync-point.
  64  */
  65 struct iris_syncobj *
  66 iris_create_syncobj(struct iris_screen *screen)
  67 {
  68    struct iris_syncobj *syncobj = malloc(sizeof(*syncobj));
  69
  70    if (!syncobj)
  71       return NULL;
  72
  73    syncobj->handle = gem_syncobj_create(screen->fd, 0);
  74    assert(syncobj->handle);
  75
  76    pipe_reference_init(&syncobj->ref, 1);
  77
  78    return syncobj;
  79 }
  80
  81 void
  82 iris_syncobj_destroy(struct iris_screen *screen, struct iris_syncobj *syncobj)
  83 {
  84    gem_syncobj_destroy(screen->fd, syncobj->handle);
  85    free(syncobj);
  86 }
  87
  88 /**
  89  * Add a sync-point to the batch, with the given flags.
  90  *
  91  * \p flags   One of I915_EXEC_FENCE_WAIT or I915_EXEC_FENCE_SIGNAL.
  92  */
  93 void
  94 iris_batch_add_syncobj(struct iris_batch *batch,
  95                        struct iris_syncobj *syncobj,
  96                        unsigned flags)
  97 {
  98    struct drm_i915_gem_exec_fence *fence =
  99       util_dynarray_grow(&batch->exec_fences, struct drm_i915_gem_exec_fence, 1);
 100
 101    *fence = (struct drm_i915_gem_exec_fence) {
 102       .handle = syncobj->handle,
 103       .flags = flags,
 104    };
 105
 106    struct iris_syncobj **store =
 107       util_dynarray_grow(&batch->syncobjs, struct iris_syncobj *, 1);
 108
 109    *store = NULL;
 110    iris_syncobj_reference(batch->screen, store, syncobj);
 111 }
 112
 113 /* ------------------------------------------------------------------- */
 114
 115 struct pipe_fence_handle {
 116    struct pipe_reference ref;
 117    struct iris_seqno *seqno[IRIS_BATCH_COUNT];
 118    unsigned count;
 119 };
 120
 121 static void
 122 iris_fence_destroy(struct pipe_screen *p_screen,
 123                    struct pipe_fence_handle *fence)
 124 {
 125    struct iris_screen *screen = (struct iris_screen *)p_screen;
 126
 127    for (unsigned i = 0; i < fence->count; i++)
 128       iris_seqno_reference(screen, &fence->seqno[i], NULL);
 129
 130    free(fence);
 131 }
 132
 133 static void
 134 iris_fence_reference(struct pipe_screen *p_screen,
 135                      struct pipe_fence_handle **dst,
 136                      struct pipe_fence_handle *src)
 137 {
 138    if (pipe_reference(*dst ? &(*dst)->ref : NULL,
 139                       src ? &src->ref : NULL))
 140       iris_fence_destroy(p_screen, *dst);
 141
 142    *dst = src;
 143 }
 144
 145 bool
 146 iris_wait_syncobj(struct pipe_screen *p_screen,
 147                   struct iris_syncobj *syncobj,
 148                   int64_t timeout_nsec)
 149 {
 150    if (!syncobj)
 151       return false;
 152
 153    struct iris_screen *screen = (struct iris_screen *)p_screen;
 154    struct drm_syncobj_wait args = {
 155       .handles = (uintptr_t)&syncobj->handle,
 156       .count_handles = 1,
 157       .timeout_nsec = timeout_nsec,
 158    };
 159    return gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args);
 160 }
 161
 162 #define CSI "\e["
 163 #define BLUE_HEADER  CSI "0;97;44m"
 164 #define NORMAL       CSI "0m"
 165
 166 static void
 167 iris_fence_flush(struct pipe_context *ctx,
 168                  struct pipe_fence_handle **out_fence,
 169                  unsigned flags)
 170 {
 171    struct iris_screen *screen = (void *) ctx->screen;
 172    struct iris_context *ice = (struct iris_context *)ctx;
 173
 174    if (flags & PIPE_FLUSH_END_OF_FRAME) {
 175       ice->frame++;
 176
 177       if (INTEL_DEBUG & DEBUG_SUBMIT) {
 178          fprintf(stderr, "%s ::: FRAME %-10u (ctx %p)%-35c%s\n",
 179                  (INTEL_DEBUG & DEBUG_COLOR) ? BLUE_HEADER : "",
 180                  ice->frame, ctx, ' ',
 181                  (INTEL_DEBUG & DEBUG_COLOR) ? NORMAL : "");
 182       }
 183    }
 184
 185    /* XXX PIPE_FLUSH_DEFERRED */
 186    for (unsigned i = 0; i < IRIS_BATCH_COUNT; i++)
 187       iris_batch_flush(&ice->batches[i]);
 188
 189    if (!out_fence)
 190       return;
 191
 192    struct pipe_fence_handle *fence = calloc(1, sizeof(*fence));
 193    if (!fence)
 194       return;
 195
 196    pipe_reference_init(&fence->ref, 1);
 197
 198    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 199       struct iris_batch *batch = &ice->batches[b];
 200
 201       if (iris_seqno_signaled(batch->last_seqno))
 202          continue;
 203
 204       iris_seqno_reference(screen,
 205                            &fence->seqno[fence->count++],
 206                            batch->last_seqno);
 207    }
 208
 209    iris_fence_reference(ctx->screen, out_fence, NULL);
 210    *out_fence = fence;
 211 }
 212
 213 static void
 214 iris_fence_await(struct pipe_context *ctx,
 215                  struct pipe_fence_handle *fence)
 216 {
 217    struct iris_context *ice = (struct iris_context *)ctx;
 218
 219    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 220       struct iris_batch *batch = &ice->batches[b];
 221
 222       for (unsigned i = 0; i < fence->count; i++) {
 223          struct iris_seqno *seqno = fence->seqno[i];
 224
 225          if (iris_seqno_signaled(seqno))
 226             continue;
 227
 228          iris_batch_add_syncobj(batch, seqno->syncobj, I915_EXEC_FENCE_WAIT);
 229       }
 230    }
 231 }
 232
 233 #define NSEC_PER_SEC (1000 * USEC_PER_SEC)
 234 #define USEC_PER_SEC (1000 * MSEC_PER_SEC)
 235 #define MSEC_PER_SEC (1000)
 236
 237 static uint64_t
 238 gettime_ns(void)
 239 {
 240    struct timespec current;
 241    clock_gettime(CLOCK_MONOTONIC, &current);
 242    return (uint64_t)current.tv_sec * NSEC_PER_SEC + current.tv_nsec;
 243 }
 244
 245 static uint64_t
 246 rel2abs(uint64_t timeout)
 247 {
 248    if (timeout == 0)
 249       return 0;
 250
 251    uint64_t current_time = gettime_ns();
 252    uint64_t max_timeout = (uint64_t) INT64_MAX - current_time;
 253
 254    timeout = MIN2(max_timeout, timeout);
 255
 256    return current_time + timeout;
 257 }
 258
 259 static bool
 260 iris_fence_finish(struct pipe_screen *p_screen,
 261                   struct pipe_context *ctx,
 262                   struct pipe_fence_handle *fence,
 263                   uint64_t timeout)
 264 {
 265    struct iris_screen *screen = (struct iris_screen *)p_screen;
 266
 267    if (!fence->count)
 268       return true;
 269
 270    unsigned int handle_count = 0;
 271    uint32_t handles[ARRAY_SIZE(fence->seqno)];
 272    for (unsigned i = 0; i < fence->count; i++) {
 273       struct iris_seqno *seqno = fence->seqno[i];
 274
 275       if (iris_seqno_signaled(seqno))
 276          continue;
 277
 278       handles[handle_count++] = seqno->syncobj->handle;
 279    }
 280
 281    if (handle_count == 0)
 282       return true;
 283
 284    struct drm_syncobj_wait args = {
 285       .handles = (uintptr_t)handles,
 286       .count_handles = handle_count,
 287       .timeout_nsec = rel2abs(timeout),
 288       .flags = DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL
 289    };
 290    return gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args) == 0;
 291 }
 292
 293 static int
 294 sync_merge_fd(int sync_fd, int new_fd)
 295 {
 296    if (sync_fd == -1)
 297       return new_fd;
 298
 299    if (new_fd == -1)
 300       return sync_fd;
 301
 302    struct sync_merge_data args = {
 303       .name = "iris fence",
 304       .fd2 = new_fd,
 305       .fence = -1,
 306    };
 307
 308    gen_ioctl(sync_fd, SYNC_IOC_MERGE, &args);
 309    close(new_fd);
 310    close(sync_fd);
 311
 312    return args.fence;
 313 }
 314
 315 static int
 316 iris_fence_get_fd(struct pipe_screen *p_screen,
 317                   struct pipe_fence_handle *fence)
 318 {
 319    struct iris_screen *screen = (struct iris_screen *)p_screen;
 320    int fd = -1;
 321
 322    if (fence->count == 0) {
 323       /* Our fence has no syncobj's recorded.  This means that all of the
 324        * batches had already completed, their syncobj's had been signalled,
 325        * and so we didn't bother to record them.  But we're being asked to
 326        * export such a fence.  So export a dummy already-signalled syncobj.
 327        */
 328       struct drm_syncobj_handle args = {
 329          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE, .fd = -1,
 330       };
 331
 332       args.handle = gem_syncobj_create(screen->fd, DRM_SYNCOBJ_CREATE_SIGNALED);
 333       gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 334       gem_syncobj_destroy(screen->fd, args.handle);
 335       return args.fd;
 336    }
 337
 338    for (unsigned i = 0; i < fence->count; i++) {
 339       struct iris_seqno *seqno = fence->seqno[i];
 340
 341       if (iris_seqno_signaled(seqno))
 342          continue;
 343
 344       struct drm_syncobj_handle args = {
 345          .handle = seqno->syncobj->handle,
 346          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE,
 347          .fd = -1,
 348       };
 349
 350       gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 351       fd = sync_merge_fd(fd, args.fd);
 352    }
 353
 354    return fd;
 355 }
 356
 357 static void
 358 iris_fence_create_fd(struct pipe_context *ctx,
 359                      struct pipe_fence_handle **out,
 360                      int fd,
 361                      enum pipe_fd_type type)
 362 {
 363    assert(type == PIPE_FD_TYPE_NATIVE_SYNC);
 364
 365    struct iris_screen *screen = (struct iris_screen *)ctx->screen;
 366    struct drm_syncobj_handle args = {
 367       .handle = gem_syncobj_create(screen->fd, DRM_SYNCOBJ_CREATE_SIGNALED),
 368       .flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE,
 369       .fd = fd,
 370    };
 371    if (gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, &args) == -1) {
 372       fprintf(stderr, "DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE failed: %s\n",
 373               strerror(errno));
 374       gem_syncobj_destroy(screen->fd, args.handle);
 375       *out = NULL;
 376       return;
 377    }
 378
 379    struct iris_syncobj *syncobj = malloc(sizeof(*syncobj));
 380    if (!syncobj) {
 381       *out = NULL;
 382       return;
 383    }
 384    syncobj->handle = args.handle;
 385    pipe_reference_init(&syncobj->ref, 1);
 386
 387    struct iris_seqno *seqno = malloc(sizeof(*seqno));
 388    if (!seqno) {
 389       free(syncobj);
 390       *out = NULL;
 391       return;
 392    }
 393
 394    static const uint32_t zero = 0;
 395
 396    /* Fences work in terms of iris_seqno, but we don't actually have a
 397     * seqno for an imported fence.  So, create a fake one which always
 398     * returns as 'not signaled' so we fall back to using the sync object.
 399     */
 400    seqno->seqno = UINT32_MAX;
 401    seqno->map = &zero;
 402    seqno->syncobj = syncobj;
 403    seqno->flags = IRIS_SEQNO_END;
 404    pipe_reference_init(&seqno->reference, 1);
 405
 406    struct pipe_fence_handle *fence = malloc(sizeof(*fence));
 407    if (!fence) {
 408       free(seqno);
 409       free(syncobj);
 410       *out = NULL;
 411       return;
 412    }
 413    pipe_reference_init(&fence->ref, 1);
 414    fence->seqno[0] = seqno;
 415    fence->count = 1;
 416
 417    *out = fence;
 418 }
 419
 420 void
 421 iris_init_screen_fence_functions(struct pipe_screen *screen)
 422 {
 423    screen->fence_reference = iris_fence_reference;
 424    screen->fence_finish = iris_fence_finish;
 425    screen->fence_get_fd = iris_fence_get_fd;
 426 }
 427
 428 void
 429 iris_init_context_fence_functions(struct pipe_context *ctx)
 430 {
 431    ctx->flush = iris_fence_flush;
 432    ctx->create_fence_fd = iris_fence_create_fd;
 433    ctx->fence_server_sync = iris_fence_await;
 434 }