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iommu/amd: Use swiotlb in passthrough mode 

In passthrough mode (iommu=pt) all devices are identity
mapped. If a device does not support 64bit DMA it might
still need remapping. Make sure swiotlb is initialized to
provide this remapping.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-07-28 16:58:50 +02:00
parent 02ca20212f
commit 3230232457
1 changed files with 3 additions and 5 deletions
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8
drivers/iommu/amd_iommu.c
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@ -2282,12 +2282,10 @@ static int amd_iommu_add_device(struct device *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) {
if (domain->type == IOMMU_DOMAIN_IDENTITY)
dev_data->passthrough = true;
dev->archdata.dma_ops = &nommu_dma_ops;
} else {
else
dev->archdata.dma_ops = &amd_iommu_dma_ops;
}
out:
iommu_completion_wait(iommu);
@ -2852,8 +2850,8 @@ int __init amd_iommu_init_api(void)
int __init amd_iommu_init_dma_ops(void)
{
swiotlb = iommu_pass_through ? 1 : 0;
iommu_detected = 1;
swiotlb = 0;
amd_iommu_stats_init();