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charset="UTF-8" Message-ID: <20190411184733.EKsh8CNxduHGneoXW0EMqFDFb7_QIkWSQUMC3ZoKiIA@z> Add iommu_dma_map_page_coherent function to allow mapping pages through the dma-iommu api using the dev->coherent_dma_mask mask instead of the dev->dma_mask mask Signed-off-by: Tom Murphy --- drivers/iommu/dma-iommu.c | 25 ++++++++++++++++++++----- include/linux/dma-iommu.h | 3 +++ 2 files changed, 23 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 613d181e78a9..0128370f8b88 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -663,7 +663,8 @@ int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma) } static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, - size_t size, int prot, struct iommu_domain *domain) + size_t size, int prot, struct iommu_domain *domain, + dma_addr_t dma_limit) { struct iommu_dma_cookie *cookie = domain->iova_cookie; size_t iova_off = 0; @@ -674,7 +675,7 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, size = iova_align(&cookie->iovad, size + iova_off); } - iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev); + iova = iommu_dma_alloc_iova(domain, size, dma_limit, dev); if (!iova) return DMA_MAPPING_ERROR; @@ -693,7 +694,19 @@ dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, int prot) { return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot, - iommu_get_dma_domain(dev)); + iommu_get_dma_domain(dev), dma_get_mask(dev)); +} + +dma_addr_t iommu_dma_map_page_coherent(struct device *dev, struct page *page, + unsigned long offset, size_t size, int prot) +{ + dma_addr_t dma_mask = dev->coherent_dma_mask; + + if (!dma_mask) + dma_mask = dma_get_mask(dev); + + return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot, + iommu_get_dma_domain(dev), dma_mask); } void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, @@ -883,7 +896,7 @@ dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys, { return __iommu_dma_map(dev, phys, size, dma_info_to_prot(dir, false, attrs) | IOMMU_MMIO, - iommu_get_dma_domain(dev)); + iommu_get_dma_domain(dev), dma_get_mask(dev)); } void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, @@ -910,7 +923,9 @@ static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev, if (!msi_page) return NULL; - iova = __iommu_dma_map(dev, msi_addr, size, prot, domain); + iova = __iommu_dma_map(dev, msi_addr, size, prot, domain, + dma_get_mask(dev)); + if (iova == DMA_MAPPING_ERROR) goto out_free_page; diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index c527ded5c41c..185ff8500841 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -55,6 +55,9 @@ int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma) dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, int prot); +dma_addr_t iommu_dma_map_page_coherent(struct device *dev, + struct page *page, unsigned long offset, + size_t size, int prot); int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, int prot); -- 2.17.1