drivers/dma-buf/seqno-fence.c

   1 /*
   2  * seqno-fence, using a dma-buf to synchronize fencing
   3  *
   4  * Copyright (C) 2012 Texas Instruments
   5  * Copyright (C) 2012-2014 Canonical Ltd
   6  * Authors:
   7  *   Rob Clark <robdclark@gmail.com>
   8  *   Maarten Lankhorst <maarten.lankhorst@canonical.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  */
  19
  20 #include <linux/slab.h>
  21 #include <linux/export.h>
  22 #include <linux/seqno-fence.h>
  23
  24 static const char *seqno_fence_get_driver_name(struct fence *fence)
  25 {
  26         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  27
  28         return seqno_fence->ops->get_driver_name(fence);
  29 }
  30
  31 static const char *seqno_fence_get_timeline_name(struct fence *fence)
  32 {
  33         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  34
  35         return seqno_fence->ops->get_timeline_name(fence);
  36 }
  37
  38 static bool seqno_enable_signaling(struct fence *fence)
  39 {
  40         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  41
  42         return seqno_fence->ops->enable_signaling(fence);
  43 }
  44
  45 static bool seqno_signaled(struct fence *fence)
  46 {
  47         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  48
  49         return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
  50 }
  51
  52 static void seqno_release(struct fence *fence)
  53 {
  54         struct seqno_fence *f = to_seqno_fence(fence);
  55
  56         dma_buf_put(f->sync_buf);
  57         if (f->ops->release)
  58                 f->ops->release(fence);
  59         else
  60                 fence_free(&f->base);
  61 }
  62
  63 static signed long seqno_wait(struct fence *fence, bool intr,
  64                                 signed long timeout)
  65 {
  66         struct seqno_fence *f = to_seqno_fence(fence);
  67
  68         return f->ops->wait(fence, intr, timeout);
  69 }
  70
  71 const struct fence_ops seqno_fence_ops = {
  72         .get_driver_name = seqno_fence_get_driver_name,
  73         .get_timeline_name = seqno_fence_get_timeline_name,
  74         .enable_signaling = seqno_enable_signaling,
  75         .signaled = seqno_signaled,
  76         .wait = seqno_wait,
  77         .release = seqno_release,
  78 };
  79 EXPORT_SYMBOL(seqno_fence_ops);