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ARM: 8508/2: videobuf2-dc: Let drivers specify DMA attrs 

DMA allocations might be subject to certain requirements specific to the
hardware using the buffers, such as availability of kernel mapping (for
contents fix-ups in the driver). The only entity that knows them is the
driver, so it must share this knowledge with vb2-dc.

This patch extends the alloc_ctx initialization interface to let the
driver specify DMA attrs, which are then stored inside the allocation
context and will be used for all allocations with that context.

As a side effect, all dma_*_coherent() calls are turned into
dma_*_attrs() calls, because the attributes need to be carried over
through all DMA operations.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Tomasz Figa 2016-02-01 22:34:42 +01:00 committed by Russell King
parent 14d3ae2efe
commit ccc66e7382
2 changed files with 32 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/media/v4l2-core/videobuf2-dma-contig.c
View File

@ -23,13 +23,16 @@
struct vb2_dc_conf {
struct device *dev;
struct dma_attrs attrs;
};
struct vb2_dc_buf {
struct device *dev;
void *vaddr;
unsigned long size;
void *cookie;
dma_addr_t dma_addr;
struct dma_attrs attrs;
enum dma_data_direction dma_dir;
struct sg_table *dma_sgt;
struct frame_vector *vec;
@ -131,7 +134,8 @@ static void vb2_dc_put(void *buf_priv)
sg_free_table(buf->sgt_base);
kfree(buf->sgt_base);
}
dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr);
dma_free_attrs(buf->dev, buf->size, buf->cookie, buf->dma_addr,
&buf->attrs);
put_device(buf->dev);
kfree(buf);
}
@ -147,14 +151,18 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size,
if (!buf)
return ERR_PTR(-ENOMEM);
buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr,
GFP_KERNEL | gfp_flags);
if (!buf->vaddr) {
buf->attrs = conf->attrs;
buf->cookie = dma_alloc_attrs(dev, size, &buf->dma_addr,
GFP_KERNEL | gfp_flags, &buf->attrs);
if (!buf->cookie) {
dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size);
kfree(buf);
return ERR_PTR(-ENOMEM);
}
if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->attrs))
buf->vaddr = buf->cookie;
/* Prevent the device from being released while the buffer is used */
buf->dev = get_device(dev);
buf->size = size;
@ -185,8 +193,8 @@ static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma)
*/
vma->vm_pgoff = 0;
ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr,
buf->dma_addr, buf->size);
ret = dma_mmap_attrs(buf->dev, vma, buf->cookie,
buf->dma_addr, buf->size, &buf->attrs);
if (ret) {
pr_err("Remapping memory failed, error: %d\n", ret);
@ -329,7 +337,7 @@ static void *vb2_dc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum)
{
struct vb2_dc_buf *buf = dbuf->priv;
return buf->vaddr + pgnum * PAGE_SIZE;
return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL;
}
static void *vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf)
@ -368,8 +376,8 @@ static struct sg_table *vb2_dc_get_base_sgt(struct vb2_dc_buf *buf)
return NULL;
}
ret = dma_get_sgtable(buf->dev, sgt, buf->vaddr, buf->dma_addr,
buf->size);
ret = dma_get_sgtable_attrs(buf->dev, sgt, buf->cookie, buf->dma_addr,
buf->size, &buf->attrs);
if (ret < 0) {
dev_err(buf->dev, "failed to get scatterlist from DMA API\n");
kfree(sgt);
@ -721,7 +729,8 @@ const struct vb2_mem_ops vb2_dma_contig_memops = {
};
EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);
void *vb2_dma_contig_init_ctx(struct device *dev)
void *vb2_dma_contig_init_ctx_attrs(struct device *dev,
struct dma_attrs *attrs)
{
struct vb2_dc_conf *conf;
@ -730,10 +739,12 @@ void *vb2_dma_contig_init_ctx(struct device *dev)
return ERR_PTR(-ENOMEM);
conf->dev = dev;
if (attrs)
conf->attrs = *attrs;
return conf;
}
EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx);
EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx_attrs);
void vb2_dma_contig_cleanup_ctx(void *alloc_ctx)
{

11
include/media/videobuf2-dma-contig.h
View File

@ -16,6 +16,8 @@
#include <media/videobuf2-v4l2.h>
#include <linux/dma-mapping.h>
struct dma_attrs;
static inline dma_addr_t
vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no)
{
@ -24,7 +26,14 @@ vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no)
return *addr;
}
void *vb2_dma_contig_init_ctx(struct device *dev);
void *vb2_dma_contig_init_ctx_attrs(struct device *dev,
struct dma_attrs *attrs);
static inline void *vb2_dma_contig_init_ctx(struct device *dev)
{
return vb2_dma_contig_init_ctx_attrs(dev, NULL);
}
void vb2_dma_contig_cleanup_ctx(void *alloc_ctx);
extern const struct vb2_mem_ops vb2_dma_contig_memops;