Hi Hans,
Thank you for the patch.
On Friday 12 September 2014 14:59:51 Hans Verkuil wrote:
> From: Hans Verkuil <hans.verk...@cisco.com>
>
> Require that dma-sg also uses an allocation context. This is in preparation
> for adding prepare/finish memops to sync the memory between DMA and CPU.
>
> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
> ---
> drivers/media/pci/cx23885/cx23885-417.c | 1 +
> drivers/media/pci/cx23885/cx23885-core.c | 10 +++++-
> drivers/media/pci/cx23885/cx23885-dvb.c | 1 +
> drivers/media/pci/cx23885/cx23885-vbi.c | 1 +
> drivers/media/pci/cx23885/cx23885-video.c | 1 +
> drivers/media/pci/cx23885/cx23885.h | 1 +
> drivers/media/pci/saa7134/saa7134-core.c | 18 +++++++---
> drivers/media/pci/saa7134/saa7134-ts.c | 1 +
> drivers/media/pci/saa7134/saa7134-vbi.c | 1 +
> drivers/media/pci/saa7134/saa7134-video.c | 1 +
> drivers/media/pci/saa7134/saa7134.h | 1 +
> drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c | 10 ++++++
> drivers/media/pci/solo6x10/solo6x10.h | 1 +
> drivers/media/pci/tw68/tw68-core.c | 15 +++++++--
> drivers/media/pci/tw68/tw68-video.c | 1 +
> drivers/media/pci/tw68/tw68.h | 1 +
> drivers/media/platform/marvell-ccic/mcam-core.c | 7 ++++
> drivers/media/platform/marvell-ccic/mcam-core.h | 1 +
> drivers/media/v4l2-core/videobuf2-core.c | 3 +-
> drivers/media/v4l2-core/videobuf2-dma-contig.c | 4 ++-
> drivers/media/v4l2-core/videobuf2-dma-sg.c | 44 ++++++++++++++++++++--
> drivers/media/v4l2-core/videobuf2-vmalloc.c | 3 +-
> include/media/videobuf2-core.h | 3 +-
> include/media/videobuf2-dma-sg.h | 3 ++
> 24 files changed, 118 insertions(+), 15 deletions(-)
[snip]
> diff --git a/drivers/media/v4l2-core/videobuf2-core.c
> b/drivers/media/v4l2-core/videobuf2-core.c index e5247a4..087cd62 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -189,6 +189,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q);
> static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
> {
> struct vb2_queue *q = vb->vb2_queue;
> + int write = !V4L2_TYPE_IS_OUTPUT(q->type);
> void *mem_priv;
> int plane;
>
> @@ -200,7 +201,7 @@ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
> unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]);
>
> mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane],
> - size, q->gfp_flags);
> + size, write, q->gfp_flags);
> if (IS_ERR_OR_NULL(mem_priv))
> goto free;
>
> diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c
> b/drivers/media/v4l2-core/videobuf2-dma-contig.c index 4a02ade..6675f12
> 100644
> --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
> +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
> @@ -155,7 +155,8 @@ static void vb2_dc_put(void *buf_priv)
> kfree(buf);
> }
>
> -static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size, gfp_t
> gfp_flags)
> +static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size, int write,
> + gfp_t gfp_flags)
> {
> struct vb2_dc_conf *conf = alloc_ctx;
> struct device *dev = conf->dev;
> @@ -176,6 +177,7 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long
> size, gfp_t gfp_flags) /* Prevent the device from being released while the
> buffer is used */ buf->dev = get_device(dev);
> buf->size = size;
> + buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
This is an unrelated bug fix, it should be split to a separate patch.
> buf->handler.refcount = &buf->refcount;
> buf->handler.put = vb2_dc_put;
> diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c
> b/drivers/media/v4l2-core/videobuf2-dma-sg.c index adefc31..9b7a041 100644
> --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
> +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
> @@ -30,11 +30,17 @@ module_param(debug, int, 0644);
> printk(KERN_DEBUG "vb2-dma-sg: " fmt, ## arg); \
> } while (0)
>
> +struct vb2_dma_sg_conf {
> + struct device *dev;
> +};
> +
> struct vb2_dma_sg_buf {
> + struct device *dev;
> void *vaddr;
> struct page **pages;
> int write;
> int offset;
> + enum dma_data_direction dma_dir;
> struct sg_table sg_table;
> size_t size;
> unsigned int num_pages;
> @@ -86,22 +92,27 @@ static int vb2_dma_sg_alloc_compacted(struct
> vb2_dma_sg_buf *buf, return 0;
> }
>
> -static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, gfp_t
> gfp_flags)
> +static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, int
> write,
> + gfp_t gfp_flags)
> {
> + struct vb2_dma_sg_conf *conf = alloc_ctx;
> struct vb2_dma_sg_buf *buf;
> int ret;
> int num_pages;
>
> + if (WARN_ON(alloc_ctx == NULL))
> + return NULL;
> buf = kzalloc(sizeof *buf, GFP_KERNEL);
> if (!buf)
> return NULL;
>
> buf->vaddr = NULL;
> - buf->write = 0;
> + buf->write = write;
> buf->offset = 0;
> buf->size = size;
> /* size is already page aligned */
> buf->num_pages = size >> PAGE_SHIFT;
> + buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
>
> buf->pages = kzalloc(buf->num_pages * sizeof(struct page *),
> GFP_KERNEL);
> @@ -117,6 +128,8 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned
> long size, gfp_t gfp_fla if (ret)
> goto fail_table_alloc;
>
> + /* Prevent the device from being released while the buffer is used */
> + buf->dev = get_device(conf->dev);
> buf->handler.refcount = &buf->refcount;
> buf->handler.put = vb2_dma_sg_put;
> buf->handler.arg = buf;
> @@ -152,6 +165,7 @@ static void vb2_dma_sg_put(void *buf_priv)
> while (--i >= 0)
> __free_page(buf->pages[i]);
> kfree(buf->pages);
> + put_device(buf->dev);
> kfree(buf);
> }
> }
> @@ -164,6 +178,7 @@ static inline int vma_is_io(struct vm_area_struct *vma)
> static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
> unsigned long size, int write)
> {
> + struct vb2_dma_sg_conf *conf = alloc_ctx;
> struct vb2_dma_sg_buf *buf;
> unsigned long first, last;
> int num_pages_from_user;
> @@ -177,6 +192,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx,
> unsigned long vaddr, buf->write = write;
> buf->offset = vaddr & ~PAGE_MASK;
> buf->size = size;
> + buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
>
> first = (vaddr & PAGE_MASK) >> PAGE_SHIFT;
> last = ((vaddr + size - 1) & PAGE_MASK) >> PAGE_SHIFT;
> @@ -233,6 +249,8 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx,
> unsigned long vaddr, buf->num_pages, buf->offset, size, 0))
> goto userptr_fail_alloc_table_from_pages;
>
> + /* Prevent the device from being released while the buffer is used */
> + buf->dev = get_device(conf->dev);
> return buf;
>
> userptr_fail_alloc_table_from_pages:
> @@ -272,6 +290,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
> }
> kfree(buf->pages);
> vb2_put_vma(buf->vma);
> + put_device(buf->dev);
> kfree(buf);
> }
>
> @@ -354,6 +373,27 @@ const struct vb2_mem_ops vb2_dma_sg_memops = {
> };
> EXPORT_SYMBOL_GPL(vb2_dma_sg_memops);
>
> +void *vb2_dma_sg_init_ctx(struct device *dev)
> +{
> + struct vb2_dma_sg_conf *conf;
> +
> + conf = kzalloc(sizeof(*conf), GFP_KERNEL);
> + if (!conf)
> + return ERR_PTR(-ENOMEM);
> +
> + conf->dev = dev;
This is unrelated to this patch, but given that the dc and dma-sg allocation
contexts only need to store a struct device pointer, wouldn't it be simpler to
teach vb2 about struct device ?
> +
> + return conf;
> +}
> +EXPORT_SYMBOL_GPL(vb2_dma_sg_init_ctx);
> +
> +void vb2_dma_sg_cleanup_ctx(void *alloc_ctx)
> +{
> + if (!IS_ERR_OR_NULL(alloc_ctx))
> + kfree(alloc_ctx);
> +}
> +EXPORT_SYMBOL_GPL(vb2_dma_sg_cleanup_ctx);
> +
> MODULE_DESCRIPTION("dma scatter/gather memory handling routines for
> videobuf2"); MODULE_AUTHOR("Andrzej Pietrasiewicz");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c
> b/drivers/media/v4l2-core/videobuf2-vmalloc.c index 313d977..d77e397 100644
> --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
> +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
> @@ -35,7 +35,8 @@ struct vb2_vmalloc_buf {
>
> static void vb2_vmalloc_put(void *buf_priv);
>
> -static void *vb2_vmalloc_alloc(void *alloc_ctx, unsigned long size, gfp_t
> gfp_flags)
> +static void *vb2_vmalloc_alloc(void *alloc_ctx, unsigned long size, int
> write,
> + gfp_t gfp_flags)
> {
> struct vb2_vmalloc_buf *buf;
>
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index fff159c..02b96ef 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -82,7 +82,8 @@ struct vb2_threadio_data;
> * unmap_dmabuf.
> */
> struct vb2_mem_ops {
> - void *(*alloc)(void *alloc_ctx, unsigned long size, gfp_t
> gfp_flags);
> + void *(*alloc)(void *alloc_ctx, unsigned long size, int
> write,
I know that we're already using a write flag in other parts of the API, but I
find it a bit confusing. I think we should either document what the write flag
means in the comment block above this structure, or replace it with a more
explicit dma direction (which the alloc function will need to compute anyway).
> + gfp_t gfp_flags);
> void (*put)(void *buf_priv);
> struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags);
>
> diff --git a/include/media/videobuf2-dma-sg.h
> b/include/media/videobuf2-dma-sg.h index 7b89852..14ce306 100644
> --- a/include/media/videobuf2-dma-sg.h
> +++ b/include/media/videobuf2-dma-sg.h
> @@ -21,6 +21,9 @@ static inline struct sg_table *vb2_dma_sg_plane_desc(
> return (struct sg_table *)vb2_plane_cookie(vb, plane_no);
> }
>
> +void *vb2_dma_sg_init_ctx(struct device *dev);
> +void vb2_dma_sg_cleanup_ctx(void *alloc_ctx);
> +
> extern const struct vb2_mem_ops vb2_dma_sg_memops;
>
> #endif
--
Regards,
Laurent Pinchart
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