From b61d271e59d7fd679ad9922ce5f16c116c0f8e94 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Mon, 20 May 2019 09:29:31 +0200 Subject: [PATCH] iommu/dma: Move domain lookup into __iommu_dma_{map,unmap} Most of the callers don't care, and the couple that do already have the domain to hand for other reasons are in slow paths where the (trivial) overhead of a repeated lookup will be utterly immaterial. Signed-off-by: Robin Murphy [hch: dropped the hunk touching iommu_dma_get_msi_page to avoid a conflict with another series] Signed-off-by: Christoph Hellwig Signed-off-by: Joerg Roedel --- drivers/iommu/dma-iommu.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index c406abe3be01..6ece8f477fc8 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -448,9 +448,10 @@ static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie, size >> iova_shift(iovad)); } -static void __iommu_dma_unmap(struct iommu_domain *domain, dma_addr_t dma_addr, +static void __iommu_dma_unmap(struct device *dev, dma_addr_t dma_addr, size_t size) { + struct iommu_domain *domain = iommu_get_dma_domain(dev); struct iommu_dma_cookie *cookie = domain->iova_cookie; struct iova_domain *iovad = &cookie->iovad; size_t iova_off = iova_offset(iovad, dma_addr); @@ -465,8 +466,9 @@ static void __iommu_dma_unmap(struct iommu_domain *domain, dma_addr_t dma_addr, } 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 = iommu_get_dma_domain(dev); struct iommu_dma_cookie *cookie = domain->iova_cookie; size_t iova_off = 0; dma_addr_t iova; @@ -565,7 +567,7 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev, static void __iommu_dma_free(struct device *dev, struct page **pages, size_t size, dma_addr_t *handle) { - __iommu_dma_unmap(iommu_get_dma_domain(dev), *handle, size); + __iommu_dma_unmap(dev, *handle, size); __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT); *handle = DMA_MAPPING_ERROR; } @@ -718,14 +720,13 @@ static void iommu_dma_sync_sg_for_device(struct device *dev, static 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)); + return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot); } static void __iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { - __iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size); + __iommu_dma_unmap(dev, handle, size); } static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, @@ -734,11 +735,10 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, { phys_addr_t phys = page_to_phys(page) + offset; bool coherent = dev_is_dma_coherent(dev); + int prot = dma_info_to_prot(dir, coherent, attrs); dma_addr_t dma_handle; - dma_handle =__iommu_dma_map(dev, phys, size, - dma_info_to_prot(dir, coherent, attrs), - iommu_get_dma_domain(dev)); + dma_handle =__iommu_dma_map(dev, phys, size, prot); if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && dma_handle != DMA_MAPPING_ERROR) arch_sync_dma_for_device(dev, phys, size, dir); @@ -750,7 +750,7 @@ static void iommu_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, { if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) iommu_dma_sync_single_for_cpu(dev, dma_handle, size, dir); - __iommu_dma_unmap(iommu_get_dma_domain(dev), dma_handle, size); + __iommu_dma_unmap(dev, dma_handle, size); } /* @@ -931,21 +931,20 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, sg = tmp; } end = sg_dma_address(sg) + sg_dma_len(sg); - __iommu_dma_unmap(iommu_get_dma_domain(dev), start, end - start); + __iommu_dma_unmap(dev, start, end - start); } static 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_info_to_prot(dir, false, attrs) | IOMMU_MMIO, - iommu_get_dma_domain(dev)); + dma_info_to_prot(dir, false, attrs) | IOMMU_MMIO); } static void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { - __iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size); + __iommu_dma_unmap(dev, handle, size); } static void *iommu_dma_alloc(struct device *dev, size_t size, @@ -1222,7 +1221,7 @@ 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); if (iova == DMA_MAPPING_ERROR) goto out_free_page;