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[media] v4l: videobuf2: add DMA coherent allocator
Add an implementation of DMA coherent memory allocator and handling routines for videobuf2, implemented on top of dma_alloc_coherent() call. Signed-off-by: Pawel Osciak <p.osciak@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> CC: Pawel Osciak <pawel@osciak.com> Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Pawel Osciak
Mauro Carvalho Chehab
parent
3c18ff06d8
commit
1a758d4e84
@ -50,6 +50,11 @@ config VIDEOBUF2_CORE
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config VIDEOBUF2_MEMOPS
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tristate
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config VIDEOBUF2_DMA_CONTIG
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select VIDEOBUF2_CORE
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select VIDEOBUF2_MEMOPS
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tristate
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config VIDEOBUF2_VMALLOC
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select VIDEOBUF2_CORE
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select VIDEOBUF2_MEMOPS
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@ -114,6 +114,7 @@ obj-$(CONFIG_VIDEO_BTCX) += btcx-risc.o
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obj-$(CONFIG_VIDEOBUF2_CORE) += videobuf2-core.o
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obj-$(CONFIG_VIDEOBUF2_MEMOPS) += videobuf2-memops.o
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obj-$(CONFIG_VIDEOBUF2_VMALLOC) += videobuf2-vmalloc.o
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obj-$(CONFIG_VIDEOBUF2_DMA_CONTIG) += videobuf2-dma-contig.o
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obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o
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185
drivers/media/video/videobuf2-dma-contig.c
Normal file
185
drivers/media/video/videobuf2-dma-contig.c
Normal file
@ -0,0 +1,185 @@
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/*
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* videobuf2-dma-contig.c - DMA contig memory allocator 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 <p.osciak@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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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <media/videobuf2-core.h>
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#include <media/videobuf2-memops.h>
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struct vb2_dc_conf {
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struct device *dev;
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};
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struct vb2_dc_buf {
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struct vb2_dc_conf *conf;
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void *vaddr;
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dma_addr_t paddr;
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unsigned long size;
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struct vm_area_struct *vma;
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atomic_t refcount;
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struct vb2_vmarea_handler handler;
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};
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static void vb2_dma_contig_put(void *buf_priv);
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static void *vb2_dma_contig_alloc(void *alloc_ctx, unsigned long size)
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{
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struct vb2_dc_conf *conf = alloc_ctx;
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struct vb2_dc_buf *buf;
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buf = kzalloc(sizeof *buf, GFP_KERNEL);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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buf->vaddr = dma_alloc_coherent(conf->dev, size, &buf->paddr,
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GFP_KERNEL);
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if (!buf->vaddr) {
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dev_err(conf->dev, "dma_alloc_coherent of size %ld failed\n",
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buf->size);
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kfree(buf);
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return ERR_PTR(-ENOMEM);
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}
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buf->conf = conf;
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buf->size = size;
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buf->handler.refcount = &buf->refcount;
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buf->handler.put = vb2_dma_contig_put;
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buf->handler.arg = buf;
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atomic_inc(&buf->refcount);
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return buf;
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}
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static void vb2_dma_contig_put(void *buf_priv)
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{
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struct vb2_dc_buf *buf = buf_priv;
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if (atomic_dec_and_test(&buf->refcount)) {
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dma_free_coherent(buf->conf->dev, buf->size, buf->vaddr,
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buf->paddr);
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kfree(buf);
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}
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}
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static void *vb2_dma_contig_cookie(void *buf_priv)
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{
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struct vb2_dc_buf *buf = buf_priv;
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return (void *)buf->paddr;
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}
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static void *vb2_dma_contig_vaddr(void *buf_priv)
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{
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struct vb2_dc_buf *buf = buf_priv;
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if (!buf)
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return 0;
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return buf->vaddr;
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}
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static unsigned int vb2_dma_contig_num_users(void *buf_priv)
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{
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struct vb2_dc_buf *buf = buf_priv;
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return atomic_read(&buf->refcount);
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}
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static int vb2_dma_contig_mmap(void *buf_priv, struct vm_area_struct *vma)
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{
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struct vb2_dc_buf *buf = buf_priv;
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if (!buf) {
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printk(KERN_ERR "No buffer to map\n");
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return -EINVAL;
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}
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return vb2_mmap_pfn_range(vma, buf->paddr, buf->size,
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&vb2_common_vm_ops, &buf->handler);
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}
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static void *vb2_dma_contig_get_userptr(void *alloc_ctx, unsigned long vaddr,
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unsigned long size, int write)
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{
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struct vb2_dc_buf *buf;
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struct vm_area_struct *vma;
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dma_addr_t paddr = 0;
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int ret;
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buf = kzalloc(sizeof *buf, GFP_KERNEL);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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ret = vb2_get_contig_userptr(vaddr, size, &vma, &paddr);
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if (ret) {
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printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n",
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vaddr);
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kfree(buf);
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return ERR_PTR(ret);
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}
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buf->size = size;
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buf->paddr = paddr;
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buf->vma = vma;
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return buf;
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}
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static void vb2_dma_contig_put_userptr(void *mem_priv)
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{
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struct vb2_dc_buf *buf = mem_priv;
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if (!buf)
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return;
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vb2_put_vma(buf->vma);
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kfree(buf);
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}
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const struct vb2_mem_ops vb2_dma_contig_memops = {
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.alloc = vb2_dma_contig_alloc,
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.put = vb2_dma_contig_put,
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.cookie = vb2_dma_contig_cookie,
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.vaddr = vb2_dma_contig_vaddr,
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.mmap = vb2_dma_contig_mmap,
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.get_userptr = vb2_dma_contig_get_userptr,
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.put_userptr = vb2_dma_contig_put_userptr,
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.num_users = vb2_dma_contig_num_users,
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};
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EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);
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void *vb2_dma_contig_init_ctx(struct device *dev)
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{
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struct vb2_dc_conf *conf;
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conf = kzalloc(sizeof *conf, GFP_KERNEL);
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if (!conf)
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return ERR_PTR(-ENOMEM);
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conf->dev = dev;
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return conf;
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}
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EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx);
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void vb2_dma_contig_cleanup_ctx(void *alloc_ctx)
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{
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kfree(alloc_ctx);
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}
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EXPORT_SYMBOL_GPL(vb2_dma_contig_cleanup_ctx);
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MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2");
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MODULE_AUTHOR("Pawel Osciak");
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MODULE_LICENSE("GPL");
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29
include/media/videobuf2-dma-contig.h
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29
include/media/videobuf2-dma-contig.h
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@ -0,0 +1,29 @@
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/*
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* videobuf2-dma-coherent.h - DMA coherent memory allocator 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 <p.osciak@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_DMA_COHERENT_H
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#define _MEDIA_VIDEOBUF2_DMA_COHERENT_H
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#include <media/videobuf2-core.h>
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static inline unsigned long vb2_dma_contig_plane_paddr(
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struct vb2_buffer *vb, unsigned int plane_no)
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{
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return (unsigned long)vb2_plane_cookie(vb, plane_no);
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}
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void *vb2_dma_contig_init_ctx(struct device *dev);
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void vb2_dma_contig_cleanup_ctx(void *alloc_ctx);
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extern const struct vb2_mem_ops vb2_dma_contig_memops;
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#endif
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