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authorJoerg Roedel <jroedel@suse.de>2015-07-28 17:58:50 +0300
committerJoerg Roedel <jroedel@suse.de>2015-07-30 11:28:48 +0300
commit323023245771589c53869396e3297c703d347852 (patch)
tree2a306888cba9e332b1edb0387d5001e75cb668f3 /drivers
parent02ca20212f0dde5c90be8de19cc159726b5561aa (diff)
downloadlinux-323023245771589c53869396e3297c703d347852.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/iommu/amd_iommu.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 6d3dae962867..e29baa6c64e3 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -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();