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
  31 #include "iris_batch.h"
  32 #include "iris_bufmgr.h"
  33 #include "iris_context.h"
  34 #include "iris_fence.h"
  35 #include "iris_screen.h"
  36
  37 static uint32_t
  38 gem_syncobj_create(int fd, uint32_t flags)
  39 {
  40    struct drm_syncobj_create args = {
  41       .flags = flags,
  42    };
  43
  44    drm_ioctl(fd, DRM_IOCTL_SYNCOBJ_CREATE, &args);
  45
  46    return args.handle;
  47 }
  48
  49 static void
  50 gem_syncobj_destroy(int fd, uint32_t handle)
  51 {
  52    struct drm_syncobj_destroy args = {
  53       .handle = handle,
  54    };
  55
  56    drm_ioctl(fd, DRM_IOCTL_SYNCOBJ_DESTROY, &args);
  57 }
  58
  59 /**
  60  * Make a new sync-point.
  61  */
  62 struct iris_syncpt *
  63 iris_create_syncpt(struct iris_screen *screen)
  64 {
  65    struct iris_syncpt *syncpt = malloc(sizeof(*syncpt));
  66
  67    if (!syncpt)
  68       return NULL;
  69
  70    syncpt->handle = gem_syncobj_create(screen->fd, 0);
  71    assert(syncpt->handle);
  72
  73    pipe_reference_init(&syncpt->ref, 1);
  74
  75    return syncpt;
  76 }
  77
  78 void
  79 iris_syncpt_destroy(struct iris_screen *screen, struct iris_syncpt *syncpt)
  80 {
  81    gem_syncobj_destroy(screen->fd, syncpt->handle);
  82    free(syncpt);
  83 }
  84
  85 /**
  86  * Add a sync-point to the batch, with the given flags.
  87  *
  88  * \p flags   One of I915_EXEC_FENCE_WAIT or I915_EXEC_FENCE_SIGNAL.
  89  */
  90 void
  91 iris_batch_add_syncpt(struct iris_batch *batch,
  92                       struct iris_syncpt *syncpt,
  93                       unsigned flags)
  94 {
  95    struct drm_i915_gem_exec_fence *fence =
  96       util_dynarray_grow(&batch->exec_fences, struct drm_i915_gem_exec_fence, 1);
  97
  98    *fence = (struct drm_i915_gem_exec_fence) {
  99       .handle = syncpt->handle,
 100       .flags = flags,
 101    };
 102
 103    struct iris_syncpt **store =
 104       util_dynarray_grow(&batch->syncpts, struct iris_syncpt *, 1);
 105
 106    *store = NULL;
 107    iris_syncpt_reference(batch->screen, store, syncpt);
 108 }
 109
 110 /* ------------------------------------------------------------------- */
 111
 112 struct pipe_fence_handle {
 113    struct pipe_reference ref;
 114    struct iris_syncpt *syncpt[IRIS_BATCH_COUNT];
 115    unsigned count;
 116 };
 117
 118 static void
 119 iris_fence_destroy(struct pipe_screen *p_screen,
 120                    struct pipe_fence_handle *fence)
 121 {
 122    struct iris_screen *screen = (struct iris_screen *)p_screen;
 123
 124    for (unsigned i = 0; i < fence->count; i++)
 125       iris_syncpt_reference(screen, &fence->syncpt[i], NULL);
 126
 127    free(fence);
 128 }
 129
 130 static void
 131 iris_fence_reference(struct pipe_screen *p_screen,
 132                      struct pipe_fence_handle **dst,
 133                      struct pipe_fence_handle *src)
 134 {
 135    if (pipe_reference(&(*dst)->ref, &src->ref))
 136       iris_fence_destroy(p_screen, *dst);
 137
 138    *dst = src;
 139 }
 140
 141 bool
 142 iris_wait_syncpt(struct pipe_screen *p_screen,
 143                  struct iris_syncpt *syncpt,
 144                  int64_t timeout_nsec)
 145 {
 146    if (!syncpt)
 147       return false;
 148
 149    struct iris_screen *screen = (struct iris_screen *)p_screen;
 150    struct drm_syncobj_wait args = {
 151       .handles = (uintptr_t)&syncpt->handle,
 152       .count_handles = 1,
 153       .timeout_nsec = timeout_nsec,
 154    };
 155    return drm_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args);
 156 }
 157
 158 static void
 159 iris_fence_flush(struct pipe_context *ctx,
 160                  struct pipe_fence_handle **out_fence,
 161                  unsigned flags)
 162 {
 163    struct iris_screen *screen = (void *) ctx->screen;
 164    struct iris_context *ice = (struct iris_context *)ctx;
 165
 166    /* XXX PIPE_FLUSH_DEFERRED */
 167    for (unsigned i = 0; i < IRIS_BATCH_COUNT; i++)
 168       iris_batch_flush(&ice->batches[i]);
 169
 170    if (!out_fence)
 171       return;
 172
 173    struct pipe_fence_handle *fence = calloc(1, sizeof(*fence));
 174    if (!fence)
 175       return;
 176
 177    pipe_reference_init(&fence->ref, 1);
 178
 179    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 180       if (!iris_wait_syncpt(ctx->screen, ice->batches[b].last_syncpt, 0))
 181          continue;
 182
 183       iris_syncpt_reference(screen, &fence->syncpt[fence->count++],
 184                             ice->batches[b].last_syncpt);
 185    }
 186    *out_fence = fence;
 187 }
 188
 189 static void
 190 iris_fence_await(struct pipe_context *ctx,
 191                  struct pipe_fence_handle *fence)
 192 {
 193    struct iris_context *ice = (struct iris_context *)ctx;
 194
 195    for (unsigned b = 0; b < IRIS_BATCH_COUNT; b++) {
 196       for (unsigned i = 0; i < fence->count; i++) {
 197          iris_batch_add_syncpt(&ice->batches[b], fence->syncpt[i],
 198                                I915_EXEC_FENCE_WAIT);
 199       }
 200    }
 201 }
 202
 203 #define NSEC_PER_SEC (1000 * USEC_PER_SEC)
 204 #define USEC_PER_SEC (1000 * MSEC_PER_SEC)
 205 #define MSEC_PER_SEC (1000)
 206
 207 static uint64_t
 208 rel2abs(uint64_t timeout)
 209 {
 210    struct timespec ts;
 211    uint64_t now;
 212
 213    if (!timeout)
 214       return 0;
 215
 216    if (timeout == PIPE_TIMEOUT_INFINITE)
 217       return INT64_MAX;
 218
 219    clock_gettime(CLOCK_MONOTONIC, &ts);
 220    now = ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
 221
 222    if (now > INT64_MAX - timeout)
 223       return INT64_MAX;
 224
 225    return now + timeout;
 226 }
 227
 228 static boolean
 229 iris_fence_finish(struct pipe_screen *p_screen,
 230                   struct pipe_context *ctx,
 231                   struct pipe_fence_handle *fence,
 232                   uint64_t timeout)
 233 {
 234    struct iris_screen *screen = (struct iris_screen *)p_screen;
 235
 236    if (!fence->count)
 237       return true;
 238
 239    uint32_t handles[ARRAY_SIZE(fence->syncpt)];
 240    for (unsigned i = 0; i < fence->count; i++)
 241       handles[i] = fence->syncpt[i]->handle;
 242
 243    struct drm_syncobj_wait args = {
 244       .handles = (uintptr_t)handles,
 245       .count_handles = fence->count,
 246       .timeout_nsec = rel2abs(timeout), /* XXX */
 247       .flags = DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL
 248    };
 249    return drm_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_WAIT, &args) == 0;
 250 }
 251
 252 #ifndef SYNC_IOC_MAGIC
 253 /* duplicated from linux/sync_file.h to avoid build-time dependency
 254  * on new (v4.7) kernel headers.  Once distro's are mostly using
 255  * something newer than v4.7 drop this and #include <linux/sync_file.h>
 256  * instead.
 257  */
 258 struct sync_merge_data {
 259    char  name[32];
 260    __s32 fd2;
 261    __s32 fence;
 262    __u32 flags;
 263    __u32 pad;
 264 };
 265
 266 #define SYNC_IOC_MAGIC '>'
 267 #define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
 268 #endif
 269
 270 static int
 271 sync_merge_fd(int sync_fd, int new_fd)
 272 {
 273    if (sync_fd == -1)
 274       return new_fd;
 275
 276    if (new_fd == -1)
 277       return sync_fd;
 278
 279    struct sync_merge_data args = {
 280       .name = "iris fence",
 281       .fd2 = new_fd,
 282       .fence = -1,
 283    };
 284
 285    drm_ioctl(sync_fd, SYNC_IOC_MERGE, &args);
 286    close(new_fd);
 287    close(sync_fd);
 288
 289    return args.fence;
 290 }
 291
 292 static int
 293 iris_fence_get_fd(struct pipe_screen *p_screen,
 294                   struct pipe_fence_handle *fence)
 295 {
 296    struct iris_screen *screen = (struct iris_screen *)p_screen;
 297    int fd = -1;
 298
 299    for (unsigned i = 0; i < fence->count; i++) {
 300       struct drm_syncobj_handle args = {
 301          .handle = fence->syncpt[i]->handle,
 302          .flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE,
 303          .fd = -1,
 304       };
 305
 306       drm_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
 307       fd = sync_merge_fd(fd, args.fd);
 308    }
 309
 310    return fd;
 311 }
 312
 313 static void
 314 iris_fence_create_fd(struct pipe_context *ctx,
 315                      struct pipe_fence_handle **out,
 316                      int fd,
 317                      enum pipe_fd_type type)
 318 {
 319    assert(type == PIPE_FD_TYPE_NATIVE_SYNC);
 320
 321    struct iris_screen *screen = (struct iris_screen *)ctx->screen;
 322    struct drm_syncobj_handle args = {
 323       .flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE,
 324       .fd = fd,
 325    };
 326    drm_ioctl(screen->fd, DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, &args);
 327
 328    struct iris_syncpt *syncpt = malloc(sizeof(*syncpt));
 329    syncpt->handle = args.handle;
 330    pipe_reference_init(&syncpt->ref, 1);
 331
 332    struct pipe_fence_handle *fence = malloc(sizeof(*fence));
 333    pipe_reference_init(&fence->ref, 1);
 334    fence->syncpt[0] = syncpt;
 335    fence->count = 1;
 336
 337    *out = fence;
 338 }
 339
 340 void
 341 iris_init_screen_fence_functions(struct pipe_screen *screen)
 342 {
 343    screen->fence_reference = iris_fence_reference;
 344    screen->fence_finish = iris_fence_finish;
 345    screen->fence_get_fd = iris_fence_get_fd;
 346 }
 347
 348 void
 349 iris_init_context_fence_functions(struct pipe_context *ctx)
 350 {
 351    ctx->flush = iris_fence_flush;
 352    ctx->create_fence_fd = iris_fence_create_fd;
 353    ctx->fence_server_sync = iris_fence_await;
 354 }