3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Joerg Roedel <joerg.roe...@amd.com>
commit ac1534a55d1e87d59a21c09c570605933b551480 upstream.
When a device is added to the system at runtime the AMD
IOMMU driver initializes the necessary data structures to
handle translation for it. But it forgets to change the
per-device dma_ops to point to the AMD IOMMU driver. So
mapping actually never happens and all DMA accesses end in
an IO_PAGE_FAULT. Fix this.
Reported-by: Stefan Assmann <sassm...@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roe...@amd.com>
[bwh: Backported to 3.2:
- Adjust context
- Use global iommu_pass_through; there is no per-device pass_through]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -59,6 +59,8 @@ static struct protection_domain *pt_doma
static struct iommu_ops amd_iommu_ops;
+static struct dma_map_ops amd_iommu_dma_ops;
+
/*
* general struct to manage commands send to an IOMMU
*/
@@ -1878,6 +1880,11 @@ static int device_change_notifier(struct
list_add_tail(&dma_domain->list, &iommu_pd_list);
spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
+ if (!iommu_pass_through)
+ dev->archdata.dma_ops = &amd_iommu_dma_ops;
+ else
+ dev->archdata.dma_ops = &nommu_dma_ops;
+
break;
case BUS_NOTIFY_DEL_DEVICE:
--
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