drivers/dma-buf/seqno-fence.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * seqno-fence, using a dma-buf to synchronize fencing
   4  *
   5  * Copyright (C) 2012 Texas Instruments
   6  * Copyright (C) 2012-2014 Canonical Ltd
   7  * Authors:
   8  *   Rob Clark <robdclark@gmail.com>
   9  *   Maarten Lankhorst <maarten.lankhorst@canonical.com>
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/export.h>
  14 #include <linux/seqno-fence.h>
  15
  16 static const char *seqno_fence_get_driver_name(struct dma_fence *fence)
  17 {
  18         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  19
  20         return seqno_fence->ops->get_driver_name(fence);
  21 }
  22
  23 static const char *seqno_fence_get_timeline_name(struct dma_fence *fence)
  24 {
  25         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  26
  27         return seqno_fence->ops->get_timeline_name(fence);
  28 }
  29
  30 static bool seqno_enable_signaling(struct dma_fence *fence)
  31 {
  32         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  33
  34         return seqno_fence->ops->enable_signaling(fence);
  35 }
  36
  37 static bool seqno_signaled(struct dma_fence *fence)
  38 {
  39         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  40
  41         return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
  42 }
  43
  44 static void seqno_release(struct dma_fence *fence)
  45 {
  46         struct seqno_fence *f = to_seqno_fence(fence);
  47
  48         dma_buf_put(f->sync_buf);
  49         if (f->ops->release)
  50                 f->ops->release(fence);
  51         else
  52                 dma_fence_free(&f->base);
  53 }
  54
  55 static signed long seqno_wait(struct dma_fence *fence, bool intr,
  56                               signed long timeout)
  57 {
  58         struct seqno_fence *f = to_seqno_fence(fence);
  59
  60         return f->ops->wait(fence, intr, timeout);
  61 }
  62
  63 const struct dma_fence_ops seqno_fence_ops = {
  64         .get_driver_name = seqno_fence_get_driver_name,
  65         .get_timeline_name = seqno_fence_get_timeline_name,
  66         .enable_signaling = seqno_enable_signaling,
  67         .signaled = seqno_signaled,
  68         .wait = seqno_wait,
  69         .release = seqno_release,
  70 };
  71 EXPORT_SYMBOL(seqno_fence_ops);