LXR linux/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
  24static const char *seqno_fence_get_driver_name(struct dma_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
  31static const char *seqno_fence_get_timeline_name(struct dma_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
  38static bool seqno_enable_signaling(struct dma_fence *fence)
  39{
  40        struct seqno_fence *seqno_fence = to_seqno_fence(fence);
  41
  42        return seqno_fence->ops->enable_signaling(fence);
  43}
  44
  45static bool seqno_signaled(struct dma_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
  52static void seqno_release(struct dma_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                dma_fence_free(&f->base);
  61}
  62
  63static signed long seqno_wait(struct dma_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
  71const struct dma_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};
  79EXPORT_SYMBOL(seqno_fence_ops);
  80