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    Subject[RFC v4 14/17] [media] vb2: add videobuf2 dma-buf fence helpers
    Date
    From: Javier Martinez Canillas <javier@osg.samsung.com>

    Add a videobuf2-fence.h header file that contains different helpers
    for DMA buffer sharing explicit fence support in videobuf2.

    v2: - use fence context provided by the caller in vb2_fence_alloc()

    Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
    Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
    ---
    include/media/videobuf2-fence.h | 48 +++++++++++++++++++++++++++++++++++++++++
    1 file changed, 48 insertions(+)
    create mode 100644 include/media/videobuf2-fence.h

    diff --git a/include/media/videobuf2-fence.h b/include/media/videobuf2-fence.h
    new file mode 100644
    index 000000000000..b49cc1bf6bb4
    --- /dev/null
    +++ b/include/media/videobuf2-fence.h
    @@ -0,0 +1,48 @@
    +/*
    + * videobuf2-fence.h - DMA buffer sharing fence helpers for videobuf 2
    + *
    + * Copyright (C) 2016 Samsung Electronics
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation.
    + */
    +
    +#include <linux/dma-fence.h>
    +#include <linux/slab.h>
    +
    +static DEFINE_SPINLOCK(vb2_fence_lock);
    +
    +static inline const char *vb2_fence_get_driver_name(struct dma_fence *fence)
    +{
    + return "vb2_fence";
    +}
    +
    +static inline const char *vb2_fence_get_timeline_name(struct dma_fence *fence)
    +{
    + return "vb2_fence_timeline";
    +}
    +
    +static inline bool vb2_fence_enable_signaling(struct dma_fence *fence)
    +{
    + return true;
    +}
    +
    +static const struct dma_fence_ops vb2_fence_ops = {
    + .get_driver_name = vb2_fence_get_driver_name,
    + .get_timeline_name = vb2_fence_get_timeline_name,
    + .enable_signaling = vb2_fence_enable_signaling,
    + .wait = dma_fence_default_wait,
    +};
    +
    +static inline struct dma_fence *vb2_fence_alloc(u64 context)
    +{
    + struct dma_fence *vb2_fence = kzalloc(sizeof(*vb2_fence), GFP_KERNEL);
    +
    + if (!vb2_fence)
    + return NULL;
    +
    + dma_fence_init(vb2_fence, &vb2_fence_ops, &vb2_fence_lock, context, 1);
    +
    + return vb2_fence;
    +}
    --
    2.13.6
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