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 "util/u_inlines.h"
  30 #include "intel/common/gen_gem.h"
  31
  32 #include "iris_batch.h"
  33 #include "iris_bufmgr.h"
  34 #include "iris_context.h"
  35 #include "iris_fence.h"
  36 #include "iris_screen.h"
  37
  38 static uint32_t
  39 gem_syncobj_create(int fd, uint32_t flags)
  40 {
  41    struct drm_syncobj_create args = {
  42       .flags = flags,
  43    };
  44
  45    gen_ioctl(fd, DRM_IOCTL_SYNCOBJ_CREATE, &args);
  46
  47    return args.handle;
  48 }
  49
  50 static void
  51 gem_syncobj_destroy(int fd, uint32_t handle)
  52 {
  53    struct drm_syncobj_destroy args = {
  54       .handle = handle,
  55    };
  56
  57    gen_ioctl(fd, DRM_IOCTL_SYNCOBJ_DESTROY, &args);
  58 }
  59
  60 /**
  61  * Make a new sync-point.
  62  */
  63 struct iris_syncpt *
  64 iris_create_syncpt(struct iris_screen *screen)
  65 {
  66    struct iris_syncpt *syncpt = malloc(sizeof(*syncpt));
  67
  68    if (!syncpt)
  69       return NULL;
  70
  71    syncpt->handle = gem_syncobj_create(screen->fd, 0);
  72    assert(syncpt->handle);
  73
  74    pipe_reference_init(&syncpt->ref, 1);
  75
  76    return syncpt;
  77 }
  78
  79 void
  80 iris_syncpt_destroy(struct iris_screen *screen, struct iris_syncpt *syncpt)
  81 {
  82    gem_syncobj_destroy(screen->fd, syncpt->handle);
  83    free(syncpt);
  84 }
  85
  86 /**
  87  * Add a sync-point to the batch, with the given flags.
  88  *
  89  * \p flags   One of I915_EXEC_FENCE_WAIT or I915_EXEC_FENCE_SIGNAL.
  90  */
  91 void
  92 iris_batch_add_syncpt(struct iris_batch *batch,
  93                       struct iris_syncpt *syncpt,
  94                       unsigned flags)
  95 {
  96    struct drm_i915_gem_exec_fence *fence =
  97       util_dynarray_grow(&batch->exec_fences, struct drm_i915_gem_exec_fence, 1);
  98
  99    *fence = (struct drm_i915_gem_exec_fence) {
 100       .handle = syncpt->handle,
 101       .flags = flags,
 102    };
 103
 104    struct iris_syncpt **store =
 105       util_dynarray_grow(&batch->syncpts, struct iris_syncpt *, 1);
 106
 107    *store = NULL;
 108    iris_syncpt_reference(batch->screen, store, syncpt);
 109 }
 110
 111 /* ------------------------------------------------------------------- */
 112
 113 struct pipe_fence_handle {
 114    struct pipe_reference ref;
 115    struct iris_syncpt *syncpt[IRIS_BATCH_COUNT];
 116    unsigned count;
 117 };
 118
 119 static void
 120 iris_fence_destroy(struct pipe_screen *p_screen,
 121                    struct pipe_fence_handle *fence)
 122 {
 123    struct iris_screen *screen = (struct iris_screen *)p_screen;
 124
 125    for (unsigned i = 0; i < fence->count; i++)
 126       iris_syncpt_reference(screen, &fence->syncpt[i], NULL);
 127
 128    free(fence);
 129 }
 130
 131 static void
 132 iris_fence_reference(struct pipe_screen *p_screen,
 133                      struct pipe_fence_handle **dst,
 134                      struct pipe_fence_handle *src)
 135 {
 136    if (pipe_reference(&(*dst)->ref, &src->ref))
 137       iris_fence_destroy(p_screen, *dst);
 138
 139    *dst = src;
 140 }
 141
 142 bool
 143 iris_wait_syncpt(struct pipe_screen *p_screen,
 144                  struct iris_syncpt *syncpt,
 145                  int64_t timeout_nsec)
 146 {
 147    if (!syncpt)
 148       return false;
 149
 150    struct iris_screen *screen = (struct iris_screen *)p_screen;
 151    struct drm_syncobj_wait args = {
 152       .handles = (uintptr_t)&syncpt->handle,
 153       .count_handles = 1,
 154       .timeout_nsec = timeout_nsec,
 155    };
 156    return gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args);
 157 }
 158
 159 #define CSI "\e["
 160 #define BLUE_HEADER  CSI "0;97;44m"
 161 #define NORMAL       CSI "0m"
 162
 163 static void
 164 iris_fence_flush(struct pipe_context *ctx,
 165                  struct pipe_fence_handle **out_fence,
 166                  unsigned flags)
 167 {
 168    struct iris_screen *screen = (void *) ctx->screen;
 169    struct iris_context *ice = (struct iris_context *)ctx;
 170
 171    if (flags & PIPE_FLUSH_END_OF_FRAME) {
 172       ice->frame++;
 173
 174       if (INTEL_DEBUG & DEBUG_SUBMIT) {
 175          fprintf(stderr, "%s ::: FRAME %-10u (ctx %p)%-35c%s\n",
 176                  (INTEL_DEBUG & DEBUG_COLOR) ? BLUE_HEADER : "",
 177                  ice->frame, ctx, ' ',
 178                  (INTEL_DEBUG & DEBUG_COLOR) ? NORMAL : "");
 179       }
 180    }
 181
 182    /* XXX PIPE_FLUSH_DEFERRED */
 183    for (unsigned i = 0; i < IRIS_BATCH_COUNT; i++)
 184       iris_batch_flush(&ice->batches[i]);
 185
 186    if (!out_fence)
 187       return;
 188
 189    struct pipe_fence_handle *fence = calloc(1, sizeof(*fence));
 190    if (!fence)
 191       return;
 192
 193    pipe_reference_init(&fence->ref, 1);
 194
 195    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 196       if (!iris_wait_syncpt(ctx->screen, ice->batches[b].last_syncpt, 0))
 197          continue;
 198
 199       iris_syncpt_reference(screen, &fence->syncpt[fence->count++],
 200                             ice->batches[b].last_syncpt);
 201    }
 202
 203    iris_fence_reference(ctx->screen, out_fence, NULL);
 204    *out_fence = fence;
 205 }
 206
 207 static void
 208 iris_fence_await(struct pipe_context *ctx,
 209                  struct pipe_fence_handle *fence)
 210 {
 211    struct iris_context *ice = (struct iris_context *)ctx;
 212
 213    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 214       for (unsigned i = 0; i < fence->count; i++) {
 215          iris_batch_add_syncpt(&ice->batches[b], fence->syncpt[i],
 216                                I915_EXEC_FENCE_WAIT);
 217       }
 218    }
 219 }
 220
 221 #define NSEC_PER_SEC (1000 * USEC_PER_SEC)
 222 #define USEC_PER_SEC (1000 * MSEC_PER_SEC)
 223 #define MSEC_PER_SEC (1000)
 224
 225 static uint64_t
 226 gettime_ns(void)
 227 {
 228    struct timespec current;
 229    clock_gettime(CLOCK_MONOTONIC, &current);
 230    return (uint64_t)current.tv_sec * NSEC_PER_SEC + current.tv_nsec;
 231 }
 232
 233 static uint64_t
 234 rel2abs(uint64_t timeout)
 235 {
 236    if (timeout == 0)
 237       return 0;
 238
 239    uint64_t current_time = gettime_ns();
 240    uint64_t max_timeout = (uint64_t) INT64_MAX - current_time;
 241
 242    timeout = MIN2(max_timeout, timeout);
 243
 244    return current_time + timeout;
 245 }
 246
 247 static bool
 248 iris_fence_finish(struct pipe_screen *p_screen,
 249                   struct pipe_context *ctx,
 250                   struct pipe_fence_handle *fence,
 251                   uint64_t timeout)
 252 {
 253    struct iris_screen *screen = (struct iris_screen *)p_screen;
 254
 255    if (!fence->count)
 256       return true;
 257
 258    uint32_t handles[ARRAY_SIZE(fence->syncpt)];
 259    for (unsigned i = 0; i < fence->count; i++)
 260       handles[i] = fence->syncpt[i]->handle;
 261
 262    struct drm_syncobj_wait args = {
 263       .handles = (uintptr_t)handles,
 264       .count_handles = fence->count,
 265       .timeout_nsec = rel2abs(timeout),
 266       .flags = DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL
 267    };
 268    return gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args) == 0;
 269 }
 270
 271 #ifndef SYNC_IOC_MAGIC
 272 /* duplicated from linux/sync_file.h to avoid build-time dependency
 273  * on new (v4.7) kernel headers.  Once distro's are mostly using
 274  * something newer than v4.7 drop this and #include <linux/sync_file.h>
 275  * instead.
 276  */
 277 struct sync_merge_data {
 278    char  name[32];
 279    __s32 fd2;
 280    __s32 fence;
 281    __u32 flags;
 282    __u32 pad;
 283 };
 284
 285 #define SYNC_IOC_MAGIC '>'
 286 #define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
 287 #endif
 288
 289 static int
 290 sync_merge_fd(int sync_fd, int new_fd)
 291 {
 292    if (sync_fd == -1)
 293       return new_fd;
 294
 295    if (new_fd == -1)
 296       return sync_fd;
 297
 298    struct sync_merge_data args = {
 299       .name = "iris fence",
 300       .fd2 = new_fd,
 301       .fence = -1,
 302    };
 303
 304    gen_ioctl(sync_fd, SYNC_IOC_MERGE, &args);
 305    close(new_fd);
 306    close(sync_fd);
 307
 308    return args.fence;
 309 }
 310
 311 static int
 312 iris_fence_get_fd(struct pipe_screen *p_screen,
 313                   struct pipe_fence_handle *fence)
 314 {
 315    struct iris_screen *screen = (struct iris_screen *)p_screen;
 316    int fd = -1;
 317
 318    if (fence->count == 0) {
 319       /* Our fence has no syncobj's recorded.  This means that all of the
 320        * batches had already completed, their syncobj's had been signalled,
 321        * and so we didn't bother to record them.  But we're being asked to
 322        * export such a fence.  So export a dummy already-signalled syncobj.
 323        */
 324       struct drm_syncobj_handle args = {
 325          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE, .fd = -1,
 326       };
 327
 328       args.handle = gem_syncobj_create(screen->fd, DRM_SYNCOBJ_CREATE_SIGNALED);
 329       gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 330       gem_syncobj_destroy(screen->fd, args.handle);
 331       return args.fd;
 332    }
 333
 334    for (unsigned i = 0; i < fence->count; i++) {
 335       struct drm_syncobj_handle args = {
 336          .handle = fence->syncpt[i]->handle,
 337          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE,
 338          .fd = -1,
 339       };
 340
 341       gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 342       fd = sync_merge_fd(fd, args.fd);
 343    }
 344
 345    return fd;
 346 }
 347
 348 static void
 349 iris_fence_create_fd(struct pipe_context *ctx,
 350                      struct pipe_fence_handle **out,
 351                      int fd,
 352                      enum pipe_fd_type type)
 353 {
 354    assert(type == PIPE_FD_TYPE_NATIVE_SYNC);
 355
 356    struct iris_screen *screen = (struct iris_screen *)ctx->screen;
 357    struct drm_syncobj_handle args = {
 358       .flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE,
 359       .fd = fd,
 360    };
 361    if (gen_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, &args) == -1) {
 362       fprintf(stderr, "DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE failed: %s\n",
 363               strerror(errno));
 364       *out = NULL;
 365       return;
 366    }
 367
 368    struct iris_syncpt *syncpt = malloc(sizeof(*syncpt));
 369    syncpt->handle = args.handle;
 370    pipe_reference_init(&syncpt->ref, 1);
 371
 372    struct pipe_fence_handle *fence = malloc(sizeof(*fence));
 373    pipe_reference_init(&fence->ref, 1);
 374    fence->syncpt[0] = syncpt;
 375    fence->count = 1;
 376
 377    *out = fence;
 378 }
 379
 380 void
 381 iris_init_screen_fence_functions(struct pipe_screen *screen)
 382 {
 383    screen->fence_reference = iris_fence_reference;
 384    screen->fence_finish = iris_fence_finish;
 385    screen->fence_get_fd = iris_fence_get_fd;
 386 }
 387
 388 void
 389 iris_init_context_fence_functions(struct pipe_context *ctx)
 390 {
 391    ctx->flush = iris_fence_flush;
 392    ctx->create_fence_fd = iris_fence_create_fd;
 393    ctx->fence_server_sync = iris_fence_await;
 394 }