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_syncobj *syncobj[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_syncobj_reference(screen, &fence->syncobj[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       if (!iris_wait_syncobj(ctx->screen, ice->batches[b].last_syncobj, 0))
 200          continue;
 201
 202       iris_syncobj_reference(screen, &fence->syncobj[fence->count++],
 203                              ice->batches[b].last_syncobj);
 204    }
 205
 206    iris_fence_reference(ctx->screen, out_fence, NULL);
 207    *out_fence = fence;
 208 }
 209
 210 static void
 211 iris_fence_await(struct pipe_context *ctx,
 212                  struct pipe_fence_handle *fence)
 213 {
 214    struct iris_context *ice = (struct iris_context *)ctx;
 215
 216    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 217       for (unsigned i = 0; i < fence->count; i++) {
 218          iris_batch_add_syncobj(&ice->batches[b], fence->syncobj[i],
 219                                I915_EXEC_FENCE_WAIT);
 220       }
 221    }
 222 }
 223
 224 #define NSEC_PER_SEC (1000 * USEC_PER_SEC)
 225 #define USEC_PER_SEC (1000 * MSEC_PER_SEC)
 226 #define MSEC_PER_SEC (1000)
 227
 228 static uint64_t
 229 gettime_ns(void)
 230 {
 231    struct timespec current;
 232    clock_gettime(CLOCK_MONOTONIC, &current);
 233    return (uint64_t)current.tv_sec * NSEC_PER_SEC + current.tv_nsec;
 234 }
 235
 236 static uint64_t
 237 rel2abs(uint64_t timeout)
 238 {
 239    if (timeout == 0)
 240       return 0;
 241
 242    uint64_t current_time = gettime_ns();
 243    uint64_t max_timeout = (uint64_t) INT64_MAX - current_time;
 244
 245    timeout = MIN2(max_timeout, timeout);
 246
 247    return current_time + timeout;
 248 }
 249
 250 static bool
 251 iris_fence_finish(struct pipe_screen *p_screen,
 252                   struct pipe_context *ctx,
 253                   struct pipe_fence_handle *fence,
 254                   uint64_t timeout)
 255 {
 256    struct iris_screen *screen = (struct iris_screen *)p_screen;
 257
 258    if (!fence->count)
 259       return true;
 260
 261    uint32_t handles[ARRAY_SIZE(fence->syncobj)];
 262    for (unsigned i = 0; i < fence->count; i++)
 263       handles[i] = fence->syncobj[i]->handle;
 264
 265    struct drm_syncobj_wait args = {
 266       .handles = (uintptr_t)handles,
 267       .count_handles = fence->count,
 268       .timeout_nsec = rel2abs(timeout),
 269       .flags = DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL
 270    };
 271    return gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args) == 0;
 272 }
 273
 274 static int
 275 sync_merge_fd(int sync_fd, int new_fd)
 276 {
 277    if (sync_fd == -1)
 278       return new_fd;
 279
 280    if (new_fd == -1)
 281       return sync_fd;
 282
 283    struct sync_merge_data args = {
 284       .name = "iris fence",
 285       .fd2 = new_fd,
 286       .fence = -1,
 287    };
 288
 289    gen_ioctl(sync_fd, SYNC_IOC_MERGE, &args);
 290    close(new_fd);
 291    close(sync_fd);
 292
 293    return args.fence;
 294 }
 295
 296 static int
 297 iris_fence_get_fd(struct pipe_screen *p_screen,
 298                   struct pipe_fence_handle *fence)
 299 {
 300    struct iris_screen *screen = (struct iris_screen *)p_screen;
 301    int fd = -1;
 302
 303    if (fence->count == 0) {
 304       /* Our fence has no syncobj's recorded.  This means that all of the
 305        * batches had already completed, their syncobj's had been signalled,
 306        * and so we didn't bother to record them.  But we're being asked to
 307        * export such a fence.  So export a dummy already-signalled syncobj.
 308        */
 309       struct drm_syncobj_handle args = {
 310          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE, .fd = -1,
 311       };
 312
 313       args.handle = gem_syncobj_create(screen->fd, DRM_SYNCOBJ_CREATE_SIGNALED);
 314       gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 315       gem_syncobj_destroy(screen->fd, args.handle);
 316       return args.fd;
 317    }
 318
 319    for (unsigned i = 0; i < fence->count; i++) {
 320       struct drm_syncobj_handle args = {
 321          .handle = fence->syncobj[i]->handle,
 322          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE,
 323          .fd = -1,
 324       };
 325
 326       gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 327       fd = sync_merge_fd(fd, args.fd);
 328    }
 329
 330    return fd;
 331 }
 332
 333 static void
 334 iris_fence_create_fd(struct pipe_context *ctx,
 335                      struct pipe_fence_handle **out,
 336                      int fd,
 337                      enum pipe_fd_type type)
 338 {
 339    assert(type == PIPE_FD_TYPE_NATIVE_SYNC);
 340
 341    struct iris_screen *screen = (struct iris_screen *)ctx->screen;
 342    struct drm_syncobj_handle args = {
 343       .handle = gem_syncobj_create(screen->fd, DRM_SYNCOBJ_CREATE_SIGNALED),
 344       .flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE,
 345       .fd = fd,
 346    };
 347    if (gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, &args) == -1) {
 348       fprintf(stderr, "DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE failed: %s\n",
 349               strerror(errno));
 350       gem_syncobj_destroy(screen->fd, args.handle);
 351       *out = NULL;
 352       return;
 353    }
 354
 355    struct iris_syncobj *syncobj = malloc(sizeof(*syncobj));
 356    syncobj->handle = args.handle;
 357    pipe_reference_init(&syncobj->ref, 1);
 358
 359    struct pipe_fence_handle *fence = malloc(sizeof(*fence));
 360    pipe_reference_init(&fence->ref, 1);
 361    fence->syncobj[0] = syncobj;
 362    fence->count = 1;
 363
 364    *out = fence;
 365 }
 366
 367 void
 368 iris_init_screen_fence_functions(struct pipe_screen *screen)
 369 {
 370    screen->fence_reference = iris_fence_reference;
 371    screen->fence_finish = iris_fence_finish;
 372    screen->fence_get_fd = iris_fence_get_fd;
 373 }
 374
 375 void
 376 iris_init_context_fence_functions(struct pipe_context *ctx)
 377 {
 378    ctx->flush = iris_fence_flush;
 379    ctx->create_fence_fd = iris_fence_create_fd;
 380    ctx->fence_server_sync = iris_fence_await;
 381 }