[PATCH 11/12] v4l: vb2-dma-contig: use sg_alloc_table_from_pages function
Hi Tomasz,
Thanks for the patch.
On Wednesday 23 May 2012 15:07:34 Tomasz Stanislawski wrote:
> This patch makes use of sg_alloc_table_from_pages to simplify
> handling of sg tables.
Would you mind moving this patch before 04/12, to avoid introducing a
vb2_dc_pages_to_sgt() user only to remove it in this patch ? Otherwise this
looks good.
> Signed-off-by: Tomasz Stanislawski
> Signed-off-by: Kyungmin Park
> ---
> drivers/media/video/videobuf2-dma-contig.c | 90 +++--
> 1 file changed, 25 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/media/video/videobuf2-dma-contig.c
> b/drivers/media/video/videobuf2-dma-contig.c index 59ee81c..b5caf1d 100644
> --- a/drivers/media/video/videobuf2-dma-contig.c
> +++ b/drivers/media/video/videobuf2-dma-contig.c
> @@ -32,7 +32,7 @@ struct vb2_dc_buf {
> /* MMAP related */
> struct vb2_vmarea_handler handler;
> atomic_trefcount;
> - struct sg_table *sgt_base;
> + struct sg_table sgt_base;
>
> /* USERPTR related */
> struct vm_area_struct *vma;
> @@ -45,57 +45,6 @@ struct vb2_dc_buf {
> /*scatterlist table functions*/
> /*/
>
> -static struct sg_table *vb2_dc_pages_to_sgt(struct page **pages,
> - unsigned int n_pages, unsigned long offset, unsigned long size)
> -{
> - struct sg_table *sgt;
> - unsigned int chunks;
> - unsigned int i;
> - unsigned int cur_page;
> - int ret;
> - struct scatterlist *s;
> -
> - sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
> - if (!sgt)
> - return ERR_PTR(-ENOMEM);
> -
> - /* compute number of chunks */
> - chunks = 1;
> - for (i = 1; i < n_pages; ++i)
> - if (pages[i] != pages[i - 1] + 1)
> - ++chunks;
> -
> - ret = sg_alloc_table(sgt, chunks, GFP_KERNEL);
> - if (ret) {
> - kfree(sgt);
> - return ERR_PTR(-ENOMEM);
> - }
> -
> - /* merging chunks and putting them into the scatterlist */
> - cur_page = 0;
> - for_each_sg(sgt->sgl, s, sgt->orig_nents, i) {
> - unsigned long chunk_size;
> - unsigned int j;
> -
> - for (j = cur_page + 1; j < n_pages; ++j)
> - if (pages[j] != pages[j - 1] + 1)
> - break;
> -
> - chunk_size = ((j - cur_page) << PAGE_SHIFT) - offset;
> - sg_set_page(s, pages[cur_page], min(size, chunk_size), offset);
> - size -= chunk_size;
> - offset = 0;
> - cur_page = j;
> - }
> -
> - return sgt;
> -}
> -
> -static void vb2_dc_release_sgtable(struct sg_table *sgt)
> -{
> - sg_free_table(sgt);
> - kfree(sgt);
> -}
>
> static void vb2_dc_sgt_foreach_page(struct sg_table *sgt,
> void (*cb)(struct page *pg))
> @@ -190,7 +139,7 @@ static void vb2_dc_put(void *buf_priv)
> if (!atomic_dec_and_test(>refcount))
> return;
>
> - vb2_dc_release_sgtable(buf->sgt_base);
> + sg_free_table(>sgt_base);
> dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr);
> kfree(buf);
> }
> @@ -254,9 +203,9 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long
> size) goto fail_pages;
> }
>
> - buf->sgt_base = vb2_dc_pages_to_sgt(pages, n_pages, 0, size);
> - if (IS_ERR(buf->sgt_base)) {
> - ret = PTR_ERR(buf->sgt_base);
> + ret = sg_alloc_table_from_pages(>sgt_base,
> + pages, n_pages, 0, size, GFP_KERNEL);
> + if (ret) {
> dev_err(dev, "failed to prepare sg table\n");
> goto fail_pages;
> }
> @@ -379,13 +328,13 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
> attach->dir = dir;
>
> /* copying the buf->base_sgt to attachment */
> - ret = sg_alloc_table(sgt, buf->sgt_base->orig_nents, GFP_KERNEL);
> + ret = sg_alloc_table(sgt, buf->sgt_base.orig_nents, GFP_KERNEL);
> if (ret) {
> kfree(attach);
> return ERR_PTR(-ENOMEM);
> }
>
> - rd = buf->sgt_base->sgl;
> + rd = buf->sgt_base.sgl;
> wr = sgt->sgl;
> for (i = 0; i < sgt->orig_nents; ++i) {
> sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
> @@ -519,7 +468,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
> if (!vma_is_io(buf->vma))
> vb2_dc_sgt_foreach_page(sgt, vb2_dc_put_dirty_page);
>
> - vb2_dc_release_sgtable(sgt);
> + sg_free_table(sgt);
> + kfree(sgt);
> vb2_put_vma(buf->vma);
> kfree(buf);
> }
> @@ -586,13 +536,20 @@ static void *vb2_dc_get_userptr(void *alloc_ctx,
> unsigned long vaddr, goto fail_vma;
> }
>
> - sgt = vb2_dc_pages_to_sgt(pages, n_pages, offset, size);
> - if (IS_ERR(sgt)) {
> - printk(KERN_ERR "failed to create scatterlist table\n");
> + sgt = kzalloc(sizeof
Re: [PATCH 11/12] v4l: vb2-dma-contig: use sg_alloc_table_from_pages function
Hi Tomasz,
Thanks for the patch.
On Wednesday 23 May 2012 15:07:34 Tomasz Stanislawski wrote:
This patch makes use of sg_alloc_table_from_pages to simplify
handling of sg tables.
Would you mind moving this patch before 04/12, to avoid introducing a
vb2_dc_pages_to_sgt() user only to remove it in this patch ? Otherwise this
looks good.
Signed-off-by: Tomasz Stanislawski t.stanisl...@samsung.com
Signed-off-by: Kyungmin Park kyungmin.p...@samsung.com
---
drivers/media/video/videobuf2-dma-contig.c | 90 +++--
1 file changed, 25 insertions(+), 65 deletions(-)
diff --git a/drivers/media/video/videobuf2-dma-contig.c
b/drivers/media/video/videobuf2-dma-contig.c index 59ee81c..b5caf1d 100644
--- a/drivers/media/video/videobuf2-dma-contig.c
+++ b/drivers/media/video/videobuf2-dma-contig.c
@@ -32,7 +32,7 @@ struct vb2_dc_buf {
/* MMAP related */
struct vb2_vmarea_handler handler;
atomic_trefcount;
- struct sg_table *sgt_base;
+ struct sg_table sgt_base;
/* USERPTR related */
struct vm_area_struct *vma;
@@ -45,57 +45,6 @@ struct vb2_dc_buf {
/*scatterlist table functions*/
/*/
-static struct sg_table *vb2_dc_pages_to_sgt(struct page **pages,
- unsigned int n_pages, unsigned long offset, unsigned long size)
-{
- struct sg_table *sgt;
- unsigned int chunks;
- unsigned int i;
- unsigned int cur_page;
- int ret;
- struct scatterlist *s;
-
- sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
- if (!sgt)
- return ERR_PTR(-ENOMEM);
-
- /* compute number of chunks */
- chunks = 1;
- for (i = 1; i n_pages; ++i)
- if (pages[i] != pages[i - 1] + 1)
- ++chunks;
-
- ret = sg_alloc_table(sgt, chunks, GFP_KERNEL);
- if (ret) {
- kfree(sgt);
- return ERR_PTR(-ENOMEM);
- }
-
- /* merging chunks and putting them into the scatterlist */
- cur_page = 0;
- for_each_sg(sgt-sgl, s, sgt-orig_nents, i) {
- unsigned long chunk_size;
- unsigned int j;
-
- for (j = cur_page + 1; j n_pages; ++j)
- if (pages[j] != pages[j - 1] + 1)
- break;
-
- chunk_size = ((j - cur_page) PAGE_SHIFT) - offset;
- sg_set_page(s, pages[cur_page], min(size, chunk_size), offset);
- size -= chunk_size;
- offset = 0;
- cur_page = j;
- }
-
- return sgt;
-}
-
-static void vb2_dc_release_sgtable(struct sg_table *sgt)
-{
- sg_free_table(sgt);
- kfree(sgt);
-}
static void vb2_dc_sgt_foreach_page(struct sg_table *sgt,
void (*cb)(struct page *pg))
@@ -190,7 +139,7 @@ static void vb2_dc_put(void *buf_priv)
if (!atomic_dec_and_test(buf-refcount))
return;
- vb2_dc_release_sgtable(buf-sgt_base);
+ sg_free_table(buf-sgt_base);
dma_free_coherent(buf-dev, buf-size, buf-vaddr, buf-dma_addr);
kfree(buf);
}
@@ -254,9 +203,9 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long
size) goto fail_pages;
}
- buf-sgt_base = vb2_dc_pages_to_sgt(pages, n_pages, 0, size);
- if (IS_ERR(buf-sgt_base)) {
- ret = PTR_ERR(buf-sgt_base);
+ ret = sg_alloc_table_from_pages(buf-sgt_base,
+ pages, n_pages, 0, size, GFP_KERNEL);
+ if (ret) {
dev_err(dev, failed to prepare sg table\n);
goto fail_pages;
}
@@ -379,13 +328,13 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
attach-dir = dir;
/* copying the buf-base_sgt to attachment */
- ret = sg_alloc_table(sgt, buf-sgt_base-orig_nents, GFP_KERNEL);
+ ret = sg_alloc_table(sgt, buf-sgt_base.orig_nents, GFP_KERNEL);
if (ret) {
kfree(attach);
return ERR_PTR(-ENOMEM);
}
- rd = buf-sgt_base-sgl;
+ rd = buf-sgt_base.sgl;
wr = sgt-sgl;
for (i = 0; i sgt-orig_nents; ++i) {
sg_set_page(wr, sg_page(rd), rd-length, rd-offset);
@@ -519,7 +468,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
if (!vma_is_io(buf-vma))
vb2_dc_sgt_foreach_page(sgt, vb2_dc_put_dirty_page);
- vb2_dc_release_sgtable(sgt);
+ sg_free_table(sgt);
+ kfree(sgt);
vb2_put_vma(buf-vma);
kfree(buf);
}
@@ -586,13 +536,20 @@ static void *vb2_dc_get_userptr(void *alloc_ctx,
unsigned long vaddr, goto fail_vma;
}
- sgt = vb2_dc_pages_to_sgt(pages, n_pages, offset, size);
- if (IS_ERR(sgt)) {
- printk(KERN_ERR failed to create scatterlist table\n);
+ sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
+ if (!sgt) {
+ printk(KERN_ERR failed to allocate sg table\n);
[PATCH 11/12] v4l: vb2-dma-contig: use sg_alloc_table_from_pages function
This patch makes use of sg_alloc_table_from_pages to simplify
handling of sg tables.
Signed-off-by: Tomasz Stanislawski
Signed-off-by: Kyungmin Park
---
drivers/media/video/videobuf2-dma-contig.c | 90
1 file changed, 25 insertions(+), 65 deletions(-)
diff --git a/drivers/media/video/videobuf2-dma-contig.c
b/drivers/media/video/videobuf2-dma-contig.c
index 59ee81c..b5caf1d 100644
--- a/drivers/media/video/videobuf2-dma-contig.c
+++ b/drivers/media/video/videobuf2-dma-contig.c
@@ -32,7 +32,7 @@ struct vb2_dc_buf {
/* MMAP related */
struct vb2_vmarea_handler handler;
atomic_trefcount;
- struct sg_table *sgt_base;
+ struct sg_table sgt_base;
/* USERPTR related */
struct vm_area_struct *vma;
@@ -45,57 +45,6 @@ struct vb2_dc_buf {
/*scatterlist table functions*/
/*/
-static struct sg_table *vb2_dc_pages_to_sgt(struct page **pages,
- unsigned int n_pages, unsigned long offset, unsigned long size)
-{
- struct sg_table *sgt;
- unsigned int chunks;
- unsigned int i;
- unsigned int cur_page;
- int ret;
- struct scatterlist *s;
-
- sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
- if (!sgt)
- return ERR_PTR(-ENOMEM);
-
- /* compute number of chunks */
- chunks = 1;
- for (i = 1; i < n_pages; ++i)
- if (pages[i] != pages[i - 1] + 1)
- ++chunks;
-
- ret = sg_alloc_table(sgt, chunks, GFP_KERNEL);
- if (ret) {
- kfree(sgt);
- return ERR_PTR(-ENOMEM);
- }
-
- /* merging chunks and putting them into the scatterlist */
- cur_page = 0;
- for_each_sg(sgt->sgl, s, sgt->orig_nents, i) {
- unsigned long chunk_size;
- unsigned int j;
-
- for (j = cur_page + 1; j < n_pages; ++j)
- if (pages[j] != pages[j - 1] + 1)
- break;
-
- chunk_size = ((j - cur_page) << PAGE_SHIFT) - offset;
- sg_set_page(s, pages[cur_page], min(size, chunk_size), offset);
- size -= chunk_size;
- offset = 0;
- cur_page = j;
- }
-
- return sgt;
-}
-
-static void vb2_dc_release_sgtable(struct sg_table *sgt)
-{
- sg_free_table(sgt);
- kfree(sgt);
-}
static void vb2_dc_sgt_foreach_page(struct sg_table *sgt,
void (*cb)(struct page *pg))
@@ -190,7 +139,7 @@ static void vb2_dc_put(void *buf_priv)
if (!atomic_dec_and_test(>refcount))
return;
- vb2_dc_release_sgtable(buf->sgt_base);
+ sg_free_table(>sgt_base);
dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr);
kfree(buf);
}
@@ -254,9 +203,9 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long
size)
goto fail_pages;
}
- buf->sgt_base = vb2_dc_pages_to_sgt(pages, n_pages, 0, size);
- if (IS_ERR(buf->sgt_base)) {
- ret = PTR_ERR(buf->sgt_base);
+ ret = sg_alloc_table_from_pages(>sgt_base,
+ pages, n_pages, 0, size, GFP_KERNEL);
+ if (ret) {
dev_err(dev, "failed to prepare sg table\n");
goto fail_pages;
}
@@ -379,13 +328,13 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
attach->dir = dir;
/* copying the buf->base_sgt to attachment */
- ret = sg_alloc_table(sgt, buf->sgt_base->orig_nents, GFP_KERNEL);
+ ret = sg_alloc_table(sgt, buf->sgt_base.orig_nents, GFP_KERNEL);
if (ret) {
kfree(attach);
return ERR_PTR(-ENOMEM);
}
- rd = buf->sgt_base->sgl;
+ rd = buf->sgt_base.sgl;
wr = sgt->sgl;
for (i = 0; i < sgt->orig_nents; ++i) {
sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
@@ -519,7 +468,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
if (!vma_is_io(buf->vma))
vb2_dc_sgt_foreach_page(sgt, vb2_dc_put_dirty_page);
- vb2_dc_release_sgtable(sgt);
+ sg_free_table(sgt);
+ kfree(sgt);
vb2_put_vma(buf->vma);
kfree(buf);
}
@@ -586,13 +536,20 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned
long vaddr,
goto fail_vma;
}
- sgt = vb2_dc_pages_to_sgt(pages, n_pages, offset, size);
- if (IS_ERR(sgt)) {
- printk(KERN_ERR "failed to create scatterlist table\n");
+ sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
+ if (!sgt) {
+ printk(KERN_ERR "failed to allocate sg table\n");
ret = -ENOMEM;
goto fail_get_user_pages;
}
+ ret = sg_alloc_table_from_pages(sgt, pages, n_pages,
+ offset, size, GFP_KERNEL);
+ if (ret) {
+
[PATCH 11/12] v4l: vb2-dma-contig: use sg_alloc_table_from_pages function
This patch makes use of sg_alloc_table_from_pages to simplify
handling of sg tables.
Signed-off-by: Tomasz Stanislawski t.stanisl...@samsung.com
Signed-off-by: Kyungmin Park kyungmin.p...@samsung.com
---
drivers/media/video/videobuf2-dma-contig.c | 90
1 file changed, 25 insertions(+), 65 deletions(-)
diff --git a/drivers/media/video/videobuf2-dma-contig.c
b/drivers/media/video/videobuf2-dma-contig.c
index 59ee81c..b5caf1d 100644
--- a/drivers/media/video/videobuf2-dma-contig.c
+++ b/drivers/media/video/videobuf2-dma-contig.c
@@ -32,7 +32,7 @@ struct vb2_dc_buf {
/* MMAP related */
struct vb2_vmarea_handler handler;
atomic_trefcount;
- struct sg_table *sgt_base;
+ struct sg_table sgt_base;
/* USERPTR related */
struct vm_area_struct *vma;
@@ -45,57 +45,6 @@ struct vb2_dc_buf {
/*scatterlist table functions*/
/*/
-static struct sg_table *vb2_dc_pages_to_sgt(struct page **pages,
- unsigned int n_pages, unsigned long offset, unsigned long size)
-{
- struct sg_table *sgt;
- unsigned int chunks;
- unsigned int i;
- unsigned int cur_page;
- int ret;
- struct scatterlist *s;
-
- sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
- if (!sgt)
- return ERR_PTR(-ENOMEM);
-
- /* compute number of chunks */
- chunks = 1;
- for (i = 1; i n_pages; ++i)
- if (pages[i] != pages[i - 1] + 1)
- ++chunks;
-
- ret = sg_alloc_table(sgt, chunks, GFP_KERNEL);
- if (ret) {
- kfree(sgt);
- return ERR_PTR(-ENOMEM);
- }
-
- /* merging chunks and putting them into the scatterlist */
- cur_page = 0;
- for_each_sg(sgt-sgl, s, sgt-orig_nents, i) {
- unsigned long chunk_size;
- unsigned int j;
-
- for (j = cur_page + 1; j n_pages; ++j)
- if (pages[j] != pages[j - 1] + 1)
- break;
-
- chunk_size = ((j - cur_page) PAGE_SHIFT) - offset;
- sg_set_page(s, pages[cur_page], min(size, chunk_size), offset);
- size -= chunk_size;
- offset = 0;
- cur_page = j;
- }
-
- return sgt;
-}
-
-static void vb2_dc_release_sgtable(struct sg_table *sgt)
-{
- sg_free_table(sgt);
- kfree(sgt);
-}
static void vb2_dc_sgt_foreach_page(struct sg_table *sgt,
void (*cb)(struct page *pg))
@@ -190,7 +139,7 @@ static void vb2_dc_put(void *buf_priv)
if (!atomic_dec_and_test(buf-refcount))
return;
- vb2_dc_release_sgtable(buf-sgt_base);
+ sg_free_table(buf-sgt_base);
dma_free_coherent(buf-dev, buf-size, buf-vaddr, buf-dma_addr);
kfree(buf);
}
@@ -254,9 +203,9 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long
size)
goto fail_pages;
}
- buf-sgt_base = vb2_dc_pages_to_sgt(pages, n_pages, 0, size);
- if (IS_ERR(buf-sgt_base)) {
- ret = PTR_ERR(buf-sgt_base);
+ ret = sg_alloc_table_from_pages(buf-sgt_base,
+ pages, n_pages, 0, size, GFP_KERNEL);
+ if (ret) {
dev_err(dev, failed to prepare sg table\n);
goto fail_pages;
}
@@ -379,13 +328,13 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
attach-dir = dir;
/* copying the buf-base_sgt to attachment */
- ret = sg_alloc_table(sgt, buf-sgt_base-orig_nents, GFP_KERNEL);
+ ret = sg_alloc_table(sgt, buf-sgt_base.orig_nents, GFP_KERNEL);
if (ret) {
kfree(attach);
return ERR_PTR(-ENOMEM);
}
- rd = buf-sgt_base-sgl;
+ rd = buf-sgt_base.sgl;
wr = sgt-sgl;
for (i = 0; i sgt-orig_nents; ++i) {
sg_set_page(wr, sg_page(rd), rd-length, rd-offset);
@@ -519,7 +468,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
if (!vma_is_io(buf-vma))
vb2_dc_sgt_foreach_page(sgt, vb2_dc_put_dirty_page);
- vb2_dc_release_sgtable(sgt);
+ sg_free_table(sgt);
+ kfree(sgt);
vb2_put_vma(buf-vma);
kfree(buf);
}
@@ -586,13 +536,20 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned
long vaddr,
goto fail_vma;
}
- sgt = vb2_dc_pages_to_sgt(pages, n_pages, offset, size);
- if (IS_ERR(sgt)) {
- printk(KERN_ERR failed to create scatterlist table\n);
+ sgt = kzalloc(sizeof *sgt, GFP_KERNEL);
+ if (!sgt) {
+ printk(KERN_ERR failed to allocate sg table\n);
ret = -ENOMEM;
goto fail_get_user_pages;
}
+ ret = sg_alloc_table_from_pages(sgt, pages, n_pages,
+ offset, size,
