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drm: rcar-du: fix common struct sg_table related issues 

The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function
returns the number of the created entries in the DMA address space.
However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and
dma_unmap_sg must be called with the original number of the entries
passed to the dma_map_sg().

struct sg_table is a common structure used for describing a non-contiguous
memory buffer, used commonly in the DRM and graphics subsystems. It
consists of a scatterlist with memory pages and DMA addresses (sgl entry),
as well as the number of scatterlist entries: CPU pages (orig_nents entry)
and DMA mapped pages (nents entry).

It turned out that it was a common mistake to misuse nents and orig_nents
entries, calling DMA-mapping functions with a wrong number of entries or
ignoring the number of mapped entries returned by the dma_map_sg()
function.

To avoid such issues, lets use a common dma-mapping wrappers operating
directly on the struct sg_table objects and use scatterlist page
iterators where possible. This, almost always, hides references to the
nents and orig_nents entries, making the code robust, easier to follow
and copy/paste safe.

dma_map_sgtable() function returns zero or an error code, so adjust the
return value check for the vsp1_du_map_sg() function.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Marek Szyprowski 2020-05-08 16:10:16 +02:00
parent 67ed9f9d95
commit 34e8548168
2 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/rcar-du/rcar_du_vsp.c
View File

@ -197,9 +197,8 @@ int rcar_du_vsp_map_fb(struct rcar_du_vsp *vsp, struct drm_framebuffer *fb,
goto fail;
ret = vsp1_du_map_sg(vsp->vsp, sgt);
if (!ret) {
if (ret) {
sg_free_table(sgt);
ret = -ENOMEM;
goto fail;
}
}

8
drivers/media/platform/vsp1/vsp1_drm.c
View File

@ -912,8 +912,8 @@ int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt)
* skip cache sync. This will need to be revisited when support for
* non-coherent buffers will be added to the DU driver.
*/
return dma_map_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents,
DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
return dma_map_sgtable(vsp1->bus_master, sgt, DMA_TO_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
}
EXPORT_SYMBOL_GPL(vsp1_du_map_sg);
@ -921,8 +921,8 @@ void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt)
{
struct vsp1_device *vsp1 = dev_get_drvdata(dev);
dma_unmap_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents,
DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
dma_unmap_sgtable(vsp1->bus_master, sgt, DMA_TO_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
}
EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);