[RESEND PATCH V6 4/6] arm64/dma-mapping: Implement DMA_ATTR_PRIVILEGED
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STALE3597d
SUPERSEDED: 13 (12M)
From: Sricharan R <hidden>
Date: 2016-12-02 14:56:31
Also in:
linux-iommu, lkml
Subsystem:
arm64 port (aarch64 architecture), iommu dma-api layer, iommu subsystem, the rest · Maintainers:
Catalin Marinas, Will Deacon, Robin Murphy, Joerg Roedel, Linus Torvalds
Revision v6 of 4 in this series; 3 review trailers (2 from subsystem maintainers).
Revisions (4)
- v6 current
- v7 [diff vs current]
- v8 [diff vs current]
- v9 [diff vs current]
From: Mitchel Humpherys <redacted> 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.murphy@arm.com> Tested-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Will Deacon <redacted> Signed-off-by: Mitchel Humpherys <redacted> --- [V6] No change 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;
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
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