From 6de8ad9b9ee0ec5b52ec8ec41401833e5e89186f Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 23 Nov 2009 18:30:32 +0100 Subject: [PATCH] x86/amd-iommu: Make iommu_flush_pages aware of multiple IOMMUs This patch extends the iommu_flush_pages function to flush the TLB entries on all IOMMUs the domain has devices on. This basically gives up the former assumption that dma_ops domains are only bound to one IOMMU in the system. For dma_ops domains this is still true but not for IOMMU-API managed domains. Giving this assumption up for dma_ops domains too allows code simplification. Further it splits out the main logic into a generic function which can be used by iommu_flush_tlb too. Signed-off-by: Joerg Roedel --- arch/x86/kernel/amd_iommu.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 8fa5cc3..7c06e57 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -447,10 +447,10 @@ static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu, * It invalidates a single PTE if the range to flush is within a single * page. Otherwise it flushes the whole TLB of the IOMMU. */ -static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid, - u64 address, size_t size) +static void __iommu_flush_pages(struct protection_domain *domain, + u64 address, size_t size, int pde) { - int s = 0; + int s = 0, i; unsigned pages = iommu_num_pages(address, size, PAGE_SIZE); address &= PAGE_MASK; @@ -464,9 +464,26 @@ static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid, s = 1; } - iommu_queue_inv_iommu_pages(iommu, address, domid, 0, s); - return 0; + for (i = 0; i < amd_iommus_present; ++i) { + if (!domain->dev_iommu[i]) + continue; + + /* + * Devices of this domain are behind this IOMMU + * We need a TLB flush + */ + iommu_queue_inv_iommu_pages(amd_iommus[i], address, + domain->id, pde, s); + } + + return; +} + +static void iommu_flush_pages(struct protection_domain *domain, + u64 address, size_t size) +{ + __iommu_flush_pages(domain, address, size, 0); } /* Flush the whole IO/TLB for a given protection domain */ @@ -1683,7 +1700,7 @@ retry: iommu_flush_tlb(iommu, dma_dom->domain.id); dma_dom->need_flush = false; } else if (unlikely(iommu_has_npcache(iommu))) - iommu_flush_pages(iommu, dma_dom->domain.id, address, size); + iommu_flush_pages(&dma_dom->domain, address, size); out: return address; @@ -1731,7 +1748,7 @@ static void __unmap_single(struct amd_iommu *iommu, dma_ops_free_addresses(dma_dom, dma_addr, pages); if (amd_iommu_unmap_flush || dma_dom->need_flush) { - iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size); + iommu_flush_pages(&dma_dom->domain, dma_addr, size); dma_dom->need_flush = false; } } -- 2.7.4