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Commit 32302324 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

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: default avatarJoerg Roedel <jroedel@suse.de>
parent 02ca2021

drivers/iommu/amd_iommu.c

+3 −5
Original line number Diff line number Diff line
@@ -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();