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Date: Wed, 17 Apr 2013 14:49:47 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Mauro Carvalho Chehab <mchehab@...hat.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Clemens Ladisch <clemens@...isch.de>,
Arnd Bergmann <arnd@...db.de>, Takashi Iwai <tiwai@...e.de>,
Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: [PATCH 1/2] [media] videobuf-dma-contig: remove support for cached mem
On Wed 17 April 2013 14:22:15 Mauro Carvalho Chehab wrote:
> videobuf_queue_dma_contig_init_cached() is not used anywhere.
> Drop support for it, cleaning up the code a little bit.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Nice!
Acked-by: Hans Verkuil <hans.verkuil@...co.com>
> ---
> drivers/media/v4l2-core/videobuf-dma-contig.c | 130 +++-----------------------
> include/media/videobuf-dma-contig.h | 10 --
> 2 files changed, 14 insertions(+), 126 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/videobuf-dma-contig.c b/drivers/media/v4l2-core/videobuf-dma-contig.c
> index 3a43ba0..67f572c 100644
> --- a/drivers/media/v4l2-core/videobuf-dma-contig.c
> +++ b/drivers/media/v4l2-core/videobuf-dma-contig.c
> @@ -27,7 +27,6 @@ struct videobuf_dma_contig_memory {
> u32 magic;
> void *vaddr;
> dma_addr_t dma_handle;
> - bool cached;
> unsigned long size;
> };
>
> @@ -43,26 +42,8 @@ static int __videobuf_dc_alloc(struct device *dev,
> unsigned long size, gfp_t flags)
> {
> mem->size = size;
> - if (mem->cached) {
> - mem->vaddr = alloc_pages_exact(mem->size, flags | GFP_DMA);
> - if (mem->vaddr) {
> - int err;
> -
> - mem->dma_handle = dma_map_single(dev, mem->vaddr,
> - mem->size,
> - DMA_FROM_DEVICE);
> - err = dma_mapping_error(dev, mem->dma_handle);
> - if (err) {
> - dev_err(dev, "dma_map_single failed\n");
> -
> - free_pages_exact(mem->vaddr, mem->size);
> - mem->vaddr = NULL;
> - return err;
> - }
> - }
> - } else
> - mem->vaddr = dma_alloc_coherent(dev, mem->size,
> - &mem->dma_handle, flags);
> + mem->vaddr = dma_alloc_coherent(dev, mem->size,
> + &mem->dma_handle, flags);
>
> if (!mem->vaddr) {
> dev_err(dev, "memory alloc size %ld failed\n", mem->size);
> @@ -77,14 +58,7 @@ static int __videobuf_dc_alloc(struct device *dev,
> static void __videobuf_dc_free(struct device *dev,
> struct videobuf_dma_contig_memory *mem)
> {
> - if (mem->cached) {
> - if (!mem->vaddr)
> - return;
> - dma_unmap_single(dev, mem->dma_handle, mem->size,
> - DMA_FROM_DEVICE);
> - free_pages_exact(mem->vaddr, mem->size);
> - } else
> - dma_free_coherent(dev, mem->size, mem->vaddr, mem->dma_handle);
> + dma_free_coherent(dev, mem->size, mem->vaddr, mem->dma_handle);
>
> mem->vaddr = NULL;
> }
> @@ -234,7 +208,7 @@ out_up:
> return ret;
> }
>
> -static struct videobuf_buffer *__videobuf_alloc_vb(size_t size, bool cached)
> +static struct videobuf_buffer *__videobuf_alloc(size_t size)
> {
> struct videobuf_dma_contig_memory *mem;
> struct videobuf_buffer *vb;
> @@ -244,22 +218,11 @@ static struct videobuf_buffer *__videobuf_alloc_vb(size_t size, bool cached)
> vb->priv = ((char *)vb) + size;
> mem = vb->priv;
> mem->magic = MAGIC_DC_MEM;
> - mem->cached = cached;
> }
>
> return vb;
> }
>
> -static struct videobuf_buffer *__videobuf_alloc_uncached(size_t size)
> -{
> - return __videobuf_alloc_vb(size, false);
> -}
> -
> -static struct videobuf_buffer *__videobuf_alloc_cached(size_t size)
> -{
> - return __videobuf_alloc_vb(size, true);
> -}
> -
> static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
> {
> struct videobuf_dma_contig_memory *mem = buf->priv;
> @@ -310,19 +273,6 @@ static int __videobuf_iolock(struct videobuf_queue *q,
> return 0;
> }
>
> -static int __videobuf_sync(struct videobuf_queue *q,
> - struct videobuf_buffer *buf)
> -{
> - struct videobuf_dma_contig_memory *mem = buf->priv;
> - BUG_ON(!mem);
> - MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
> -
> - dma_sync_single_for_cpu(q->dev, mem->dma_handle, mem->size,
> - DMA_FROM_DEVICE);
> -
> - return 0;
> -}
> -
> static int __videobuf_mmap_mapper(struct videobuf_queue *q,
> struct videobuf_buffer *buf,
> struct vm_area_struct *vma)
> @@ -331,8 +281,6 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
> struct videobuf_mapping *map;
> int retval;
> unsigned long size;
> - unsigned long pos, start = vma->vm_start;
> - struct page *page;
>
> dev_dbg(q->dev, "%s\n", __func__);
>
> @@ -359,43 +307,16 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
> size = vma->vm_end - vma->vm_start;
> size = (size < mem->size) ? size : mem->size;
>
> - if (!mem->cached) {
> - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> - retval = remap_pfn_range(vma, vma->vm_start,
> - mem->dma_handle >> PAGE_SHIFT,
> + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> + retval = remap_pfn_range(vma, vma->vm_start,
> + mem->dma_handle >> PAGE_SHIFT,
> size, vma->vm_page_prot);
> - if (retval) {
> - dev_err(q->dev, "mmap: remap failed with error %d. ",
> - retval);
> - dma_free_coherent(q->dev, mem->size,
> - mem->vaddr, mem->dma_handle);
> - goto error;
> - }
> - } else {
> - pos = (unsigned long)mem->vaddr;
> -
> - while (size > 0) {
> - page = virt_to_page((void *)pos);
> - if (NULL == page) {
> - dev_err(q->dev, "mmap: virt_to_page failed\n");
> - __videobuf_dc_free(q->dev, mem);
> - goto error;
> - }
> - retval = vm_insert_page(vma, start, page);
> - if (retval) {
> - dev_err(q->dev, "mmap: insert failed with error %d\n",
> - retval);
> - __videobuf_dc_free(q->dev, mem);
> - goto error;
> - }
> - start += PAGE_SIZE;
> - pos += PAGE_SIZE;
> -
> - if (size > PAGE_SIZE)
> - size -= PAGE_SIZE;
> - else
> - size = 0;
> - }
> + if (retval) {
> + dev_err(q->dev, "mmap: remap failed with error %d. ",
> + retval);
> + dma_free_coherent(q->dev, mem->size,
> + mem->vaddr, mem->dma_handle);
> + goto error;
> }
>
> vma->vm_ops = &videobuf_vm_ops;
> @@ -417,17 +338,8 @@ error:
>
> static struct videobuf_qtype_ops qops = {
> .magic = MAGIC_QTYPE_OPS,
> - .alloc_vb = __videobuf_alloc_uncached,
> - .iolock = __videobuf_iolock,
> - .mmap_mapper = __videobuf_mmap_mapper,
> - .vaddr = __videobuf_to_vaddr,
> -};
> -
> -static struct videobuf_qtype_ops qops_cached = {
> - .magic = MAGIC_QTYPE_OPS,
> - .alloc_vb = __videobuf_alloc_cached,
> + .alloc_vb = __videobuf_alloc,
> .iolock = __videobuf_iolock,
> - .sync = __videobuf_sync,
> .mmap_mapper = __videobuf_mmap_mapper,
> .vaddr = __videobuf_to_vaddr,
> };
> @@ -447,20 +359,6 @@ void videobuf_queue_dma_contig_init(struct videobuf_queue *q,
> }
> EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init);
>
> -void videobuf_queue_dma_contig_init_cached(struct videobuf_queue *q,
> - const struct videobuf_queue_ops *ops,
> - struct device *dev,
> - spinlock_t *irqlock,
> - enum v4l2_buf_type type,
> - enum v4l2_field field,
> - unsigned int msize,
> - void *priv, struct mutex *ext_lock)
> -{
> - videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
> - priv, &qops_cached, ext_lock);
> -}
> -EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init_cached);
> -
> dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf)
> {
> struct videobuf_dma_contig_memory *mem = buf->priv;
> diff --git a/include/media/videobuf-dma-contig.h b/include/media/videobuf-dma-contig.h
> index f473aeb..f0ed825 100644
> --- a/include/media/videobuf-dma-contig.h
> +++ b/include/media/videobuf-dma-contig.h
> @@ -26,16 +26,6 @@ void videobuf_queue_dma_contig_init(struct videobuf_queue *q,
> void *priv,
> struct mutex *ext_lock);
>
> -void videobuf_queue_dma_contig_init_cached(struct videobuf_queue *q,
> - const struct videobuf_queue_ops *ops,
> - struct device *dev,
> - spinlock_t *irqlock,
> - enum v4l2_buf_type type,
> - enum v4l2_field field,
> - unsigned int msize,
> - void *priv,
> - struct mutex *ext_lock);
> -
> dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf);
> void videobuf_dma_contig_free(struct videobuf_queue *q,
> struct videobuf_buffer *buf);
>
--
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