From 52717828356b643a1650fca845b4af488a954cca Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Tue, 28 Jul 2015 16:58:51 +0200 Subject: [PATCH] iommu/amd: Set global dma_ops if swiotlb is disabled Some AMD systems also have non-PCI devices which can do DMA. Those can't be handled by the AMD IOMMU, as the hardware can only handle PCI. These devices would end up with no dma_ops, as neither the per-device nor the global dma_ops will get set. SWIOTLB provides global dma_ops when it is active, so make sure there are global dma_ops too when swiotlb is disabled. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index e29baa6c64e3..fa9508bb76dd 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2853,6 +2853,15 @@ int __init amd_iommu_init_dma_ops(void) swiotlb = iommu_pass_through ? 1 : 0; iommu_detected = 1; + /* + * In case we don't initialize SWIOTLB (actually the common case + * when AMD IOMMU is enabled), make sure there are global + * dma_ops set as a fall-back for devices not handled by this + * driver (for example non-PCI devices). + */ + if (!swiotlb) + dma_ops = &nommu_dma_ops; + amd_iommu_stats_init(); if (amd_iommu_unmap_flush) -- 2.20.1