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Date: Thu, 7 Sep 2017 15:42:23 -0300 From: Gustavo Padovan <gustavo@...ovan.org> To: linux-media@...r.kernel.org Cc: Hans Verkuil <hverkuil@...all.nl>, Mauro Carvalho Chehab <mchehab@....samsung.com>, Shuah Khan <shuahkh@....samsung.com>, linux-kernel@...r.kernel.org, Javier Martinez Canillas <javier@....samsung.com> Subject: [PATCH v3 12/15] [media] vb2: add videobuf2 dma-buf fence helpers From: Javier Martinez Canillas <javier@....samsung.com> Add a videobuf2-fence.h header file that contains different helpers for DMA buffer sharing explicit fence support in videobuf2. Signed-off-by: Javier Martinez Canillas <javier@....samsung.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com> --- include/media/videobuf2-fence.h | 49 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 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..ed5612ca03d6 --- /dev/null +++ b/include/media/videobuf2-fence.h @@ -0,0 +1,49 @@ +/* + * 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(void) +{ + 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, + dma_fence_context_alloc(1), 1); + + return vb2_fence; +} -- 2.13.5
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