We should only assign intel_dma_ops to devices which will actually use the iommu and let the default fall back dma_direct_* functions handle all other devices. This won't change any behaviour but will just use the generic implementations for direct mapped devices rather than intel specific ones.
Signed-off-by: Tom Murphy murphyt7@tcd.ie --- drivers/iommu/intel-iommu.c | 52 +++++-------------------------------- 1 file changed, 6 insertions(+), 46 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index c1ea66467918..64b1a9793daa 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2794,17 +2794,6 @@ static int __init si_domain_init(int hw) return 0; }
-static int identity_mapping(struct device *dev) -{ - struct device_domain_info *info; - - info = dev->archdata.iommu; - if (info && info != DUMMY_DEVICE_DOMAIN_INFO && info != DEFER_DEVICE_DOMAIN_INFO) - return (info->domain == si_domain); - - return 0; -} - static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev) { struct dmar_domain *ndomain; @@ -3461,12 +3450,6 @@ static struct dmar_domain *get_private_domain_for_dev(struct device *dev) return domain; }
-/* Check if the dev needs to go through non-identity map and unmap process.*/ -static bool iommu_no_mapping(struct device *dev) -{ - return iommu_dummy(dev) || identity_mapping(dev); -} - static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr, size_t size, int dir, u64 dma_mask) { @@ -3531,9 +3514,6 @@ static dma_addr_t intel_map_page(struct device *dev, struct page *page, enum dma_data_direction dir, unsigned long attrs) { - if (iommu_no_mapping(dev)) - return dma_direct_map_page(dev, page, offset, size, dir, attrs); - return __intel_map_single(dev, page_to_phys(page) + offset, size, dir, *dev->dma_mask); } @@ -3542,10 +3522,6 @@ static dma_addr_t intel_map_resource(struct device *dev, phys_addr_t phys_addr, size_t size, enum dma_data_direction dir, unsigned long attrs) { - if (iommu_no_mapping(dev)) - return dma_direct_map_resource(dev, phys_addr, size, dir, - attrs); - return __intel_map_single(dev, phys_addr, size, dir, *dev->dma_mask); }
@@ -3597,17 +3573,13 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir, unsigned long attrs) { - if (iommu_no_mapping(dev)) - dma_direct_unmap_page(dev, dev_addr, size, dir, attrs); - else - intel_unmap(dev, dev_addr, size); + intel_unmap(dev, dev_addr, size); }
static void intel_unmap_resource(struct device *dev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir, unsigned long attrs) { - if (!iommu_no_mapping(dev)) - intel_unmap(dev, dev_addr, size); + intel_unmap(dev, dev_addr, size); }
static void *intel_alloc_coherent(struct device *dev, size_t size, @@ -3617,9 +3589,6 @@ static void *intel_alloc_coherent(struct device *dev, size_t size, struct page *page = NULL; int order;
- if (iommu_no_mapping(dev)) - return dma_direct_alloc(dev, size, dma_handle, flags, attrs); - size = PAGE_ALIGN(size); order = get_order(size);
@@ -3653,9 +3622,6 @@ static void intel_free_coherent(struct device *dev, size_t size, void *vaddr, int order; struct page *page = virt_to_page(vaddr);
- if (iommu_no_mapping(dev)) - return dma_direct_free(dev, size, vaddr, dma_handle, attrs); - size = PAGE_ALIGN(size); order = get_order(size);
@@ -3673,9 +3639,6 @@ static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist, struct scatterlist *sg; int i;
- if (iommu_no_mapping(dev)) - return dma_direct_unmap_sg(dev, sglist, nelems, dir, attrs); - for_each_sg(sglist, sg, nelems, i) { nrpages += aligned_nrpages(sg_dma_address(sg), sg_dma_len(sg)); } @@ -3699,8 +3662,6 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele struct intel_iommu *iommu;
BUG_ON(dir == DMA_NONE); - if (iommu_no_mapping(dev)) - return dma_direct_map_sg(dev, sglist, nelems, dir, attrs);
domain = deferred_attach_domain(dev); if (!domain) @@ -3747,8 +3708,6 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
static u64 intel_get_required_mask(struct device *dev) { - if (iommu_no_mapping(dev)) - return dma_direct_get_required_mask(dev); return DMA_BIT_MASK(32); }
@@ -5014,7 +4973,6 @@ int __init intel_iommu_init(void) if (!has_untrusted_dev() || intel_no_bounce) swiotlb = 0; #endif - dma_ops = &intel_dma_ops;
init_iommu_pm_ops();
@@ -5623,6 +5581,8 @@ static int intel_iommu_add_device(struct device *dev) dev_info(dev, "Device uses a private identity domain.\n"); } + } else { + dev->dma_ops = &intel_dma_ops; } } else { if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) { @@ -5639,6 +5599,7 @@ static int intel_iommu_add_device(struct device *dev) dev_info(dev, "Device uses a private dma domain.\n"); } + dev->dma_ops = &intel_dma_ops; } }
@@ -5665,8 +5626,7 @@ static void intel_iommu_remove_device(struct device *dev)
iommu_device_unlink(&iommu->iommu, dev);
- if (device_needs_bounce(dev)) - set_dma_ops(dev, NULL); + set_dma_ops(dev, NULL); }
static void intel_iommu_get_resv_regions(struct device *device,