From 004cc3781c40a577b0349eef825efaaebc42dd43 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 9 Dec 2010 10:20:47 -0300 Subject: [media] v4l: videobuf2: add generic memory handling routines Add generic memory handling routines for userspace pointer handling, contiguous memory verification and mapping. Signed-off-by: Marek Szyprowski Signed-off-by: Pawel Osciak Signed-off-by: Kyungmin Park CC: Pawel Osciak Reviewed-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- include/media/videobuf2-memops.h | 45 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 include/media/videobuf2-memops.h (limited to 'include/media/videobuf2-memops.h') diff --git a/include/media/videobuf2-memops.h b/include/media/videobuf2-memops.h new file mode 100644 index 000000000000..fee17033a728 --- /dev/null +++ b/include/media/videobuf2-memops.h @@ -0,0 +1,45 @@ +/* + * videobuf2-memops.h - generic memory handling routines for videobuf2 + * + * Copyright (C) 2010 Samsung Electronics + * + * Author: Pawel Osciak + * Marek Szyprowski + * + * 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. + */ + +#ifndef _MEDIA_VIDEOBUF2_MEMOPS_H +#define _MEDIA_VIDEOBUF2_MEMOPS_H + +#include + +/** + * vb2_vmarea_handler - common vma refcount tracking handler + * @refcount: pointer to refcount entry in the buffer + * @put: callback to function that decreases buffer refcount + * @arg: argument for @put callback + */ +struct vb2_vmarea_handler { + atomic_t *refcount; + void (*put)(void *arg); + void *arg; +}; + +extern const struct vm_operations_struct vb2_common_vm_ops; + +int vb2_get_contig_userptr(unsigned long vaddr, unsigned long size, + struct vm_area_struct **res_vma, dma_addr_t *res_pa); + +int vb2_mmap_pfn_range(struct vm_area_struct *vma, unsigned long paddr, + unsigned long size, + const struct vm_operations_struct *vm_ops, + void *priv); + +struct vm_area_struct *vb2_get_vma(struct vm_area_struct *vma); +void vb2_put_vma(struct vm_area_struct *vma); + + +#endif -- cgit v1.2.3