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-rw-r--r--arch/x86/kernel/amd_iommu.c41
1 files changed, 35 insertions, 6 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index bb28e2cda71..5c465c91150 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -792,6 +792,15 @@ free_dma_dom:
}
/*
+ * little helper function to check whether a given protection domain is a
+ * dma_ops domain
+ */
+static bool dma_ops_domain(struct protection_domain *domain)
+{
+ return domain->flags & PD_DMA_OPS_MASK;
+}
+
+/*
* Find out the protection domain structure for a given PCI device. This
* will give us the pointer to the page table root for example.
*/
@@ -1096,6 +1105,9 @@ static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
/* device not handled by any AMD IOMMU */
return (dma_addr_t)paddr;
+ if (!dma_ops_domain(domain))
+ return bad_dma_address;
+
spin_lock_irqsave(&domain->lock, flags);
addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false,
dma_mask);
@@ -1126,6 +1138,9 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
/* device not handled by any AMD IOMMU */
return;
+ if (!dma_ops_domain(domain))
+ return;
+
spin_lock_irqsave(&domain->lock, flags);
__unmap_single(iommu, domain->priv, dma_addr, size, dir);
@@ -1180,6 +1195,9 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
if (!iommu || !domain)
return map_sg_no_iommu(dev, sglist, nelems, dir);
+ if (!dma_ops_domain(domain))
+ return 0;
+
spin_lock_irqsave(&domain->lock, flags);
for_each_sg(sglist, s, nelems, i) {
@@ -1233,6 +1251,9 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
!get_device_resources(dev, &iommu, &domain, &devid))
return;
+ if (!dma_ops_domain(domain))
+ return;
+
spin_lock_irqsave(&domain->lock, flags);
for_each_sg(sglist, s, nelems, i) {
@@ -1278,6 +1299,9 @@ static void *alloc_coherent(struct device *dev, size_t size,
return virt_addr;
}
+ if (!dma_ops_domain(domain))
+ goto out_free;
+
if (!dma_mask)
dma_mask = *dev->dma_mask;
@@ -1286,18 +1310,20 @@ static void *alloc_coherent(struct device *dev, size_t size,
*dma_addr = __map_single(dev, iommu, domain->priv, paddr,
size, DMA_BIDIRECTIONAL, true, dma_mask);
- if (*dma_addr == bad_dma_address) {
- free_pages((unsigned long)virt_addr, get_order(size));
- virt_addr = NULL;
- goto out;
- }
+ if (*dma_addr == bad_dma_address)
+ goto out_free;
iommu_completion_wait(iommu);
-out:
spin_unlock_irqrestore(&domain->lock, flags);
return virt_addr;
+
+out_free:
+
+ free_pages((unsigned long)virt_addr, get_order(size));
+
+ return NULL;
}
/*
@@ -1319,6 +1345,9 @@ static void free_coherent(struct device *dev, size_t size,
if (!iommu || !domain)
goto free_mem;
+ if (!dma_ops_domain(domain))
+ goto free_mem;
+
spin_lock_irqsave(&domain->lock, flags);
__unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);