Messages in this thread | | | Subject | Re: [PATCH v9 01/32] drm: prime: add common helper to check scatterlist contiguity | From | Robin Murphy <> | Date | Tue, 1 Sep 2020 18:23:54 +0100 |
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On 2020-08-26 07:32, Marek Szyprowski wrote: > It is a common operation done by DRM drivers to check the contiguity > of the DMA-mapped buffer described by a scatterlist in the > sg_table object. Let's add a common helper for this operation.
I still think this could be hoisted even further out to the common sgtable API level, but let's get the individual subsystems straightened out first then worry about consolidation later.
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> > Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> > --- > drivers/gpu/drm/drm_gem_cma_helper.c | 23 +++------------------ > drivers/gpu/drm/drm_prime.c | 31 ++++++++++++++++++++++++++++ > include/drm/drm_prime.h | 2 ++ > 3 files changed, 36 insertions(+), 20 deletions(-) > > diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c > index 822edeadbab3..59b9ca207b42 100644 > --- a/drivers/gpu/drm/drm_gem_cma_helper.c > +++ b/drivers/gpu/drm/drm_gem_cma_helper.c > @@ -471,26 +471,9 @@ drm_gem_cma_prime_import_sg_table(struct drm_device *dev, > { > struct drm_gem_cma_object *cma_obj; > > - if (sgt->nents != 1) { > - /* check if the entries in the sg_table are contiguous */ > - dma_addr_t next_addr = sg_dma_address(sgt->sgl); > - struct scatterlist *s; > - unsigned int i; > - > - for_each_sg(sgt->sgl, s, sgt->nents, i) { > - /* > - * sg_dma_address(s) is only valid for entries > - * that have sg_dma_len(s) != 0 > - */ > - if (!sg_dma_len(s)) > - continue; > - > - if (sg_dma_address(s) != next_addr) > - return ERR_PTR(-EINVAL); > - > - next_addr = sg_dma_address(s) + sg_dma_len(s); > - } > - } > + /* check if the entries in the sg_table are contiguous */ > + if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) > + return ERR_PTR(-EINVAL); > > /* Create a CMA GEM buffer. */ > cma_obj = __drm_gem_cma_create(dev, attach->dmabuf->size); > diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c > index 1693aa7c14b5..4ed5ed1f078c 100644 > --- a/drivers/gpu/drm/drm_prime.c > +++ b/drivers/gpu/drm/drm_prime.c > @@ -825,6 +825,37 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_page > } > EXPORT_SYMBOL(drm_prime_pages_to_sg); > > +/** > + * drm_prime_get_contiguous_size - returns the contiguous size of the buffer > + * @sgt: sg_table describing the buffer to check > + * > + * This helper calculates the contiguous size in the DMA address space > + * of the the buffer described by the provided sg_table. > + * > + * This is useful for implementing > + * &drm_gem_object_funcs.gem_prime_import_sg_table. > + */ > +unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt) > +{ > + dma_addr_t expected = sg_dma_address(sgt->sgl); > + struct scatterlist *sg; > + unsigned long size = 0; > + int i; > + > + for_each_sgtable_dma_sg(sgt, sg, i) { > + unsigned int len = sg_dma_len(sg); > + > + if (!len) > + break; > + if (sg_dma_address(sg) != expected) > + break; > + expected += len; > + size += len; > + } > + return size; > +} > +EXPORT_SYMBOL(drm_prime_get_contiguous_size); > + > /** > * drm_gem_prime_export - helper library implementation of the export callback > * @obj: GEM object to export > diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h > index 9af7422b44cf..47ef11614627 100644 > --- a/include/drm/drm_prime.h > +++ b/include/drm/drm_prime.h > @@ -92,6 +92,8 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_page > struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj, > int flags); > > +unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt); > + > /* helper functions for importing */ > struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev, > struct dma_buf *dma_buf, >
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