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         return seqno_fence->ops->get_driver_name(fence);
  28 }
  29
  30 static const char *seqno_fence_get_timeline_name(struct fence *fence)
  31 {
  32         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  33         return seqno_fence->ops->get_timeline_name(fence);
  34 }
  35
  36 static bool seqno_enable_signaling(struct fence *fence)
  37 {
  38         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  39         return seqno_fence->ops->enable_signaling(fence);
  40 }
  41
  42 static bool seqno_signaled(struct fence *fence)
  43 {
  44         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  45         return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
  46 }
  47
  48 static void seqno_release(struct fence *fence)
  49 {
  50         struct seqno_fence *f = to_seqno_fence(fence);
  51
  52         dma_buf_put(f->sync_buf);
  53         if (f->ops->release)
  54                 f->ops->release(fence);
  55         else
  56                 fence_free(&f->base);
  57 }
  58
  59 static signed long seqno_wait(struct fence *fence, bool intr, signed long timeout)
  60 {
  61         struct seqno_fence *f = to_seqno_fence(fence);
  62         return f->ops->wait(fence, intr, timeout);
  63 }
  64
  65 const struct fence_ops seqno_fence_ops = {
  66         .get_driver_name = seqno_fence_get_driver_name,
  67         .get_timeline_name = seqno_fence_get_timeline_name,
  68         .enable_signaling = seqno_enable_signaling,
  69         .signaled = seqno_signaled,
  70         .wait = seqno_wait,
  71         .release = seqno_release,
  72 };
  73 EXPORT_SYMBOL(seqno_fence_ops);