From 07ee86948c9111d49583be462500042fedfecb4a Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 28 May 2015 18:41:42 +0200 Subject: [PATCH] iommu/amd: Put IOMMUv2 devices in a direct mapped domain A device that might be used for HSA needs to be in a direct mapped domain so that all DMA-API mappings stay alive when the IOMMUv2 stack is used. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 188b81d..623be17 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2253,6 +2253,8 @@ static void detach_device(struct device *dev) static int amd_iommu_add_device(struct device *dev) { + struct iommu_dev_data *dev_data; + struct iommu_domain *domain; struct amd_iommu *iommu; u16 devid; int ret; @@ -2270,7 +2272,18 @@ static int amd_iommu_add_device(struct device *dev) } init_iommu_group(dev); - dev->archdata.dma_ops = &amd_iommu_dma_ops; + dev_data = get_dev_data(dev); + if (dev_data && dev_data->iommu_v2) + iommu_request_dm_for_dev(dev); + + /* Domains are initialized for this device - have a look what we ended up with */ + domain = iommu_get_domain_for_dev(dev); + if (domain->type == IOMMU_DOMAIN_IDENTITY) { + dev_data->passthrough = true; + dev->archdata.dma_ops = &nommu_dma_ops; + } else { + dev->archdata.dma_ops = &amd_iommu_dma_ops; + } out: iommu_completion_wait(iommu); -- 2.7.4