From 43c5bf11a610ceeae68b26c24e0c76852d0d5cfc Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Wed, 12 Sep 2018 16:24:13 +0100 Subject: iommu/dma: Use fast DMA domain lookup Most parts of iommu-dma already assume they are operating on a default domain set up by iommu_dma_init_domain(), and can be converted straight over to avoid the refcounting bottleneck. MSI page mappings may be in an unmanaged domain with an explicit MSI-only cookie, so retain the non-specific lookup, but that's OK since they're far from a contended fast path either way. Signed-off-by: Robin Murphy Tested-by: Will Deacon Signed-off-by: Joerg Roedel --- drivers/iommu/dma-iommu.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) (limited to 'drivers/iommu') diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 511ff9a1d6d9..320f9ea82f3f 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -491,7 +491,7 @@ static struct page **__iommu_dma_alloc_pages(unsigned int count, void iommu_dma_free(struct device *dev, struct page **pages, size_t size, dma_addr_t *handle) { - __iommu_dma_unmap(iommu_get_domain_for_dev(dev), *handle, size); + __iommu_dma_unmap(iommu_get_dma_domain(dev), *handle, size); __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT); *handle = IOMMU_MAPPING_ERROR; } @@ -518,7 +518,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp, unsigned long attrs, int prot, dma_addr_t *handle, void (*flush_page)(struct device *, const void *, phys_addr_t)) { - struct iommu_domain *domain = iommu_get_domain_for_dev(dev); + struct iommu_domain *domain = iommu_get_dma_domain(dev); struct iommu_dma_cookie *cookie = domain->iova_cookie; struct iova_domain *iovad = &cookie->iovad; struct page **pages; @@ -606,9 +606,8 @@ 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) + size_t size, int prot, struct iommu_domain *domain) { - struct iommu_domain *domain = iommu_get_domain_for_dev(dev); struct iommu_dma_cookie *cookie = domain->iova_cookie; size_t iova_off = 0; dma_addr_t iova; @@ -632,13 +631,14 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, 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); + return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot, + iommu_get_dma_domain(dev)); } 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_domain_for_dev(dev), handle, size); + __iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size); } /* @@ -726,7 +726,7 @@ static void __invalidate_sg(struct scatterlist *sg, int nents) int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, int prot) { - struct iommu_domain *domain = iommu_get_domain_for_dev(dev); + struct iommu_domain *domain = iommu_get_dma_domain(dev); struct iommu_dma_cookie *cookie = domain->iova_cookie; struct iova_domain *iovad = &cookie->iovad; struct scatterlist *s, *prev = NULL; @@ -811,20 +811,21 @@ void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, sg = tmp; } end = sg_dma_address(sg) + sg_dma_len(sg); - __iommu_dma_unmap(iommu_get_domain_for_dev(dev), start, end - start); + __iommu_dma_unmap(iommu_get_dma_domain(dev), start, end - start); } 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); + dma_info_to_prot(dir, false, attrs) | IOMMU_MMIO, + iommu_get_dma_domain(dev)); } 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_domain_for_dev(dev), handle, size); + __iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size); } int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) @@ -850,7 +851,7 @@ 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); + iova = __iommu_dma_map(dev, msi_addr, size, prot, domain); if (iommu_dma_mapping_error(dev, iova)) goto out_free_page; -- cgit v1.2.3