src/gallium/drivers/v3d/v3d_fence.c

   1 /*
   2  * Copyright © 2014 Broadcom
   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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /** @file v3d_fence.c
  25  *
  26  * Seqno-based fence management.
  27  *
  28  * We have two mechanisms for waiting in our kernel API: You can wait on a BO
  29  * to have all rendering to from any process to be completed, or wait on a
  30  * seqno for that particular seqno to be passed.  The fence API we're
  31  * implementing is based on waiting for all rendering in the context to have
  32  * completed (with no reference to what other processes might be doing with
  33  * the same BOs), so we can just use the seqno of the last rendering we'd
  34  * fired off as our fence marker.
  35  */
  36
  37 #include "util/u_inlines.h"
  38 #include "util/os_time.h"
  39
  40 #include "v3d_context.h"
  41 #include "v3d_bufmgr.h"
  42
  43 struct v3d_fence {
  44         struct pipe_reference reference;
  45         int fd;
  46 };
  47
  48 static void
  49 v3d_fence_reference(struct pipe_screen *pscreen,
  50                     struct pipe_fence_handle **pp,
  51                     struct pipe_fence_handle *pf)
  52 {
  53         struct v3d_fence **p = (struct v3d_fence **)pp;
  54         struct v3d_fence *f = (struct v3d_fence *)pf;
  55         struct v3d_fence *old = *p;
  56
  57         if (pipe_reference(&(*p)->reference, &f->reference)) {
  58                 close(old->fd);
  59                 free(old);
  60         }
  61         *p = f;
  62 }
  63
  64 static bool
  65 v3d_fence_finish(struct pipe_screen *pscreen,
  66                  struct pipe_context *ctx,
  67                  struct pipe_fence_handle *pf,
  68                  uint64_t timeout_ns)
  69 {
  70         struct v3d_screen *screen = v3d_screen(pscreen);
  71         struct v3d_fence *f = (struct v3d_fence *)pf;
  72         int ret;
  73
  74         unsigned syncobj;
  75         ret = drmSyncobjCreate(screen->fd, 0, &syncobj);
  76         if (ret) {
  77                 fprintf(stderr, "Failed to create syncobj to wait on: %d\n",
  78                         ret);
  79                 return false;
  80         }
  81
  82         ret = drmSyncobjImportSyncFile(screen->fd, syncobj, f->fd);
  83         if (ret) {
  84                 fprintf(stderr, "Failed to import fence to syncobj: %d\n", ret);
  85                 return false;
  86         }
  87
  88         uint64_t abs_timeout = os_time_get_absolute_timeout(timeout_ns);
  89         if (abs_timeout == OS_TIMEOUT_INFINITE)
  90                 abs_timeout = INT64_MAX;
  91
  92         ret = drmSyncobjWait(screen->fd, &syncobj, 1, abs_timeout, 0, NULL);
  93
  94         drmSyncobjDestroy(screen->fd, syncobj);
  95
  96         return ret >= 0;
  97 }
  98
  99 struct v3d_fence *
 100 v3d_fence_create(struct v3d_context *v3d)
 101 {
 102         struct v3d_fence *f = calloc(1, sizeof(*f));
 103         if (!f)
 104                 return NULL;
 105
 106         /* Snapshot the last V3D rendering's out fence.  We'd rather have
 107          * another syncobj instead of a sync file, but this is all we get.
 108          * (HandleToFD/FDToHandle just gives you another syncobj ID for the
 109          * same syncobj).
 110          */
 111         drmSyncobjExportSyncFile(v3d->fd, v3d->out_sync, &f->fd);
 112         if (f->fd == -1) {
 113                 fprintf(stderr, "export failed\n");
 114                 free(f);
 115                 return NULL;
 116         }
 117
 118         pipe_reference_init(&f->reference, 1);
 119
 120         return f;
 121 }
 122
 123 void
 124 v3d_fence_init(struct v3d_screen *screen)
 125 {
 126         screen->base.fence_reference = v3d_fence_reference;
 127         screen->base.fence_finish = v3d_fence_finish;
 128 }