On 12/12/16 18:38, Sricharan R wrote: > From: Mitchel Humpherys <mitch...@codeaurora.org> > > The newly added DMA_ATTR_PRIVILEGED is useful for creating mappings that > are only accessible to privileged DMA engines. Implement it in > dma-iommu.c so that the ARM64 DMA IOMMU mapper can make use of it. > > Reviewed-by: Robin Murphy <robin.mur...@arm.com> > Tested-by: Robin Murphy <robin.mur...@arm.com> > Acked-by: Will Deacon <will.dea...@arm.com> > Signed-off-by: Mitchel Humpherys <mitch...@codeaurora.org> > --- > arch/arm64/mm/dma-mapping.c | 6 +++--- > drivers/iommu/dma-iommu.c | 10 ++++++++-- > include/linux/dma-iommu.h | 3 ++- > 3 files changed, 13 insertions(+), 6 deletions(-) > > diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c > index 401f79a..ae76ead 100644 > --- a/arch/arm64/mm/dma-mapping.c > +++ b/arch/arm64/mm/dma-mapping.c > @@ -557,7 +557,7 @@ static void *__iommu_alloc_attrs(struct device *dev, > size_t size, > unsigned long attrs) > { > bool coherent = is_device_dma_coherent(dev); > - int ioprot = dma_direction_to_prot(DMA_BIDIRECTIONAL, coherent); > + int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs); > size_t iosize = size; > void *addr; > > @@ -711,7 +711,7 @@ static dma_addr_t __iommu_map_page(struct device *dev, > struct page *page, > unsigned long attrs) > { > bool coherent = is_device_dma_coherent(dev); > - int prot = dma_direction_to_prot(dir, coherent); > + int prot = dma_info_to_prot(dir, coherent, attrs); > dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot); > > if (!iommu_dma_mapping_error(dev, dev_addr) && > @@ -769,7 +769,7 @@ static int __iommu_map_sg_attrs(struct device *dev, > struct scatterlist *sgl, > __iommu_sync_sg_for_device(dev, sgl, nelems, dir); > > return iommu_dma_map_sg(dev, sgl, nelems, > - dma_direction_to_prot(dir, coherent)); > + dma_info_to_prot(dir, coherent, attrs)); > } > > static void __iommu_unmap_sg_attrs(struct device *dev, > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index d2a7a46..756d5e0 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -182,16 +182,22 @@ int iommu_dma_init_domain(struct iommu_domain *domain, > dma_addr_t base, > EXPORT_SYMBOL(iommu_dma_init_domain); > > /** > - * dma_direction_to_prot - Translate DMA API directions to IOMMU API page > flags > + * dma_info_to_prot - Translate DMA API directions and attributes to IOMMU > API > + * page flags. > * @dir: Direction of DMA transfer > * @coherent: Is the DMA master cache-coherent? > + * @attrs: DMA attributes for the mapping > * > * Return: corresponding IOMMU API page protection flags > */ > -int dma_direction_to_prot(enum dma_data_direction dir, bool coherent) > +int dma_info_to_prot(enum dma_data_direction dir, bool coherent, > + unsigned long attrs) > { > int prot = coherent ? IOMMU_CACHE : 0; > > + if (attrs & DMA_ATTR_PRIVILEGED) > + prot |= IOMMU_PRIV; > + > switch (dir) { > case DMA_BIDIRECTIONAL: > return prot | IOMMU_READ | IOMMU_WRITE;
...and applying against -next now also needs this hunk: @@ -639,7 +639,7 @@ dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys, size_t size, enum dma_data_direction dir, unsigned long attrs) { return __iommu_dma_map(dev, phys, size, - dma_direction_to_prot(dir, false) | IOMMU_MMIO); + dma_info_to_prot(dir, false, attrs) | IOMMU_MMIO); } void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, With those two issues fixed up, I've given the series (applied to next-20161213) a spin on a SMMUv3/PL330 fast model and it still checks out. Robin. > diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h > index 32c5890..a203181 100644 > --- a/include/linux/dma-iommu.h > +++ b/include/linux/dma-iommu.h > @@ -34,7 +34,8 @@ int iommu_dma_init_domain(struct iommu_domain *domain, > dma_addr_t base, > u64 size, struct device *dev); > > /* General helpers for DMA-API <-> IOMMU-API interaction */ > -int dma_direction_to_prot(enum dma_data_direction dir, bool coherent); > +int dma_info_to_prot(enum dma_data_direction dir, bool coherent, > + unsigned long attrs); > > /* > * These implement the bulk of the relevant DMA mapping callbacks, but > require >