From 5cd3f2e98ccaa668210ed2e3a1d6bde3189fe366 Mon Sep 17 00:00:00 2001 From: Tom Murphy Date: Thu, 13 Jun 2019 23:04:55 +0100 Subject: iommu/amd: Flush not present cache in iommu_map_page check if there is a not-present cache present and flush it if there is. Signed-off-by: Tom Murphy Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) (limited to 'drivers/iommu') diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 86613f139618..a91732f170ea 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -1307,6 +1307,16 @@ static void domain_flush_complete(struct protection_domain *domain) } } +/* Flush the not present cache if it exists */ +static void domain_flush_np_cache(struct protection_domain *domain, + dma_addr_t iova, size_t size) +{ + if (unlikely(amd_iommu_np_cache)) { + domain_flush_pages(domain, iova, size); + domain_flush_complete(domain); + } +} + /* * This function flushes the DTEs for all devices in domain @@ -2389,10 +2399,7 @@ static dma_addr_t __map_single(struct device *dev, } address += offset; - if (unlikely(amd_iommu_np_cache)) { - domain_flush_pages(&dma_dom->domain, address, size); - domain_flush_complete(&dma_dom->domain); - } + domain_flush_np_cache(&dma_dom->domain, address, size); out: return address; @@ -2571,6 +2578,9 @@ static int map_sg(struct device *dev, struct scatterlist *sglist, s->dma_length = s->length; } + if (s) + domain_flush_np_cache(domain, s->dma_address, s->dma_length); + return nelems; out_unmap: @@ -3051,6 +3061,8 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL); mutex_unlock(&domain->api_lock); + domain_flush_np_cache(domain, iova, page_size); + return ret; } -- cgit v1.2.3-58-ga151