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21fb0cb7ec
Provide simple helper functions to map virtual address range into an array of pfns / pages. Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/*
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* videobuf2-memops.h - generic memory handling routines for videobuf2
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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* Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#ifndef _MEDIA_VIDEOBUF2_MEMOPS_H
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#define _MEDIA_VIDEOBUF2_MEMOPS_H
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#include <media/videobuf2-core.h>
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#include <linux/mm.h>
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/**
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* vb2_vmarea_handler - common vma refcount tracking handler
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* @refcount: pointer to refcount entry in the buffer
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* @put: callback to function that decreases buffer refcount
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* @arg: argument for @put callback
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*/
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struct vb2_vmarea_handler {
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atomic_t *refcount;
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void (*put)(void *arg);
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void *arg;
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};
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extern const struct vm_operations_struct vb2_common_vm_ops;
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int vb2_get_contig_userptr(unsigned long vaddr, unsigned long size,
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struct vm_area_struct **res_vma, dma_addr_t *res_pa);
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struct vm_area_struct *vb2_get_vma(struct vm_area_struct *vma);
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void vb2_put_vma(struct vm_area_struct *vma);
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struct frame_vector *vb2_create_framevec(unsigned long start,
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unsigned long length,
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bool write);
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void vb2_destroy_framevec(struct frame_vector *vec);
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#endif
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