Re: [Linaro-mm-sig] [PATCH v9 32/32] videobuf2: use sgtable-based scatterlist wrappers

On 2020-08-26 07:33, Marek Szyprowski wrote:

Use recently introduced common wrappers operating directly on the struct sg_table objects and scatterlist page iterators to make the code a bit more compact, robust, easier to follow and copy/paste safe.

No functional change, because the code already properly did all the scaterlist related calls.

^^ typo

Otherwise,

Reviewed-by: Robin Murphy robin.murphy@arm.com

Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com

.../common/videobuf2/videobuf2-dma-contig.c | 34 ++++++++----------- .../media/common/videobuf2/videobuf2-dma-sg.c | 32 +++++++---------- .../common/videobuf2/videobuf2-vmalloc.c | 12 +++---- 3 files changed, 31 insertions(+), 47 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c index ec3446cc45b8..1b242d844dde 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -58,10 +58,10 @@ static unsigned long vb2_dc_get_contiguous_size(struct sg_table *sgt) unsigned int i; unsigned long size = 0;

• for_each_sg(sgt->sgl, s, sgt->nents, i) {

• for_each_sgtable_dma_sg(sgt, s, i) { if (sg_dma_address(s) != expected) break;

• expected = sg_dma_address(s) + sg_dma_len(s);
  

• expected += sg_dma_len(s);
  

  size += sg_dma_len(s); } return size;

@@ -103,8 +103,7 @@ static void vb2_dc_prepare(void *buf_priv) if (!sgt) return;

• dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,

• 	       buf->dma_dir);
  

• dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir); }

static void vb2_dc_finish(void *buf_priv) @@ -115,7 +114,7 @@ static void vb2_dc_finish(void *buf_priv) if (!sgt) return;

• dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);

• dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir); }

/*********************************************/ @@ -275,8 +274,8 @@ static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf, * memory locations do not require any explicit cache * maintenance prior or after being used by the device. */

• dma_unmap_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
  

• 		   attach->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir,
  

• 		  DMA_ATTR_SKIP_CPU_SYNC);
  

  sg_free_table(sgt); kfree(attach); db_attach->priv = NULL;

@@ -301,8 +300,8 @@ static struct sg_table *vb2_dc_dmabuf_ops_map( /* release any previous cache */ if (attach->dma_dir != DMA_NONE) {

• dma_unmap_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
  

• 		   attach->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir,
  

• 		  DMA_ATTR_SKIP_CPU_SYNC);
  

  attach->dma_dir = DMA_NONE; }

@@ -310,9 +309,8 @@ static struct sg_table *vb2_dc_dmabuf_ops_map( * mapping to the client with new direction, no cache sync * required see comment in vb2_dc_dmabuf_ops_detach() */

• sgt->nents = dma_map_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,

• 		      dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• if (!sgt->nents) {

• if (dma_map_sgtable(db_attach->dev, sgt, dma_dir,

• 	    DMA_ATTR_SKIP_CPU_SYNC)) {
  

  pr_err("failed to map scatterlist\n"); mutex_unlock(lock); return ERR_PTR(-EIO);

@@ -455,8 +453,8 @@ static void vb2_dc_put_userptr(void *buf_priv) * No need to sync to CPU, it's already synced to the CPU * since the finish() memop will have been called before this. */

• dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
  

• 		   buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
  

• 		  DMA_ATTR_SKIP_CPU_SYNC);
  

  pages = frame_vector_pages(buf->vec); /* sgt should exist only if vector contains pages... */ BUG_ON(IS_ERR(pages));

@@ -553,9 +551,8 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr, * No need to sync to the device, this will happen later when the * prepare() memop is called. */

• sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,

• 		      buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• if (sgt->nents <= 0) {

• if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,

• 	    DMA_ATTR_SKIP_CPU_SYNC)) {
  

  pr_err("failed to map scatterlist\n"); ret = -EIO; goto fail_sgt_init;

@@ -577,8 +574,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr, return buf; fail_map_sg:

• dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,

• 	   buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);

fail_sgt_init: sg_free_table(sgt); diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c index 0a40e00f0d7e..0dd3b19025e0 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c @@ -148,9 +148,8 @@ static void *vb2_dma_sg_alloc(struct device *dev, unsigned long dma_attrs, * No need to sync to the device, this will happen later when the * prepare() memop is called. */

• sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,

• 		      buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• if (!sgt->nents)

• if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,

• 	    DMA_ATTR_SKIP_CPU_SYNC))
  

  goto fail_map;

buf->handler.refcount = &buf->refcount; @@ -186,8 +185,8 @@ static void vb2_dma_sg_put(void *buf_priv) if (refcount_dec_and_test(&buf->refcount)) { dprintk(1, "%s: Freeing buffer of %d pages\n", __func__, buf->num_pages);

• dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
  

• 		   buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
  

• 		  DMA_ATTR_SKIP_CPU_SYNC);
  

  if (buf->vaddr) vm_unmap_ram(buf->vaddr, buf->num_pages); sg_free_table(buf->dma_sgt);

@@ -204,8 +203,7 @@ static void vb2_dma_sg_prepare(void *buf_priv) struct vb2_dma_sg_buf *buf = buf_priv; struct sg_table *sgt = buf->dma_sgt;

• dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,

• 	       buf->dma_dir);
  

• dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir); }

static void vb2_dma_sg_finish(void *buf_priv) @@ -213,7 +211,7 @@ static void vb2_dma_sg_finish(void *buf_priv) struct vb2_dma_sg_buf *buf = buf_priv; struct sg_table *sgt = buf->dma_sgt;

• dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);

• dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir); }

static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr, @@ -256,9 +254,8 @@ static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr, * No need to sync to the device, this will happen later when the * prepare() memop is called. */

• sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,

• 		      buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
  

• if (!sgt->nents)

• if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,

• 	    DMA_ATTR_SKIP_CPU_SYNC))
  

  goto userptr_fail_map;

return buf; @@ -284,8 +281,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv) dprintk(1, "%s: Releasing userspace buffer of %d pages\n", __func__, buf->num_pages);

• dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir,

• 	   DMA_ATTR_SKIP_CPU_SYNC);
  

• dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); if (buf->vaddr) vm_unmap_ram(buf->vaddr, buf->num_pages); sg_free_table(buf->dma_sgt);

@@ -408,8 +404,7 @@ static void vb2_dma_sg_dmabuf_ops_detach(struct dma_buf *dbuf, /* release the scatterlist cache */ if (attach->dma_dir != DMA_NONE)

• dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
  

• 	attach->dma_dir);
  

• dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
  

  sg_free_table(sgt); kfree(attach); db_attach->priv = NULL;

@@ -434,15 +429,12 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map( /* release any previous cache */ if (attach->dma_dir != DMA_NONE) {

• dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
  

• 	attach->dma_dir);
  

• dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
  

  attach->dma_dir = DMA_NONE; }

/* mapping to the client with new direction */

• sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,

• 		dma_dir);
  

• if (!sgt->nents) {

• if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) { pr_err("failed to map scatterlist\n"); mutex_unlock(lock); return ERR_PTR(-EIO);

diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c index c66fda4a65e4..bf5ac63a5742 100644 --- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c +++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c @@ -229,7 +229,7 @@ static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf, kfree(attach); return ret; }

• for_each_sg(sgt->sgl, sg, sgt->nents, i) {

• for_each_sgtable_sg(sgt, sg, i) { struct page *page = vmalloc_to_page(vaddr);

if (!page) { @@ -259,8 +259,7 @@ static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf, /* release the scatterlist cache */ if (attach->dma_dir != DMA_NONE)

• dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
  

• 	attach->dma_dir);
  

• dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
  

  sg_free_table(sgt); kfree(attach); db_attach->priv = NULL;

@@ -285,15 +284,12 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map( /* release any previous cache */ if (attach->dma_dir != DMA_NONE) {

• dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
  

• 	attach->dma_dir);
  

• dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
  

  attach->dma_dir = DMA_NONE; }

/* mapping to the client with new direction */

• sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,

• 		dma_dir);
  

• if (!sgt->nents) {

• if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) { pr_err("failed to map scatterlist\n"); mutex_unlock(lock); return ERR_PTR(-EIO);