x86/amd-iommu: Use only per-device dma_ops

Unfortunatly there are systems where the AMD IOMMU does not
cover all devices. This breaks with the current driver as it
initializes the global dma_ops variable. This patch limits
the AMD IOMMU to the devices listed in the IVRS table fixing
DMA for devices not covered by the IOMMU.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index cd8cbeb..b2c309b 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -30,6 +30,7 @@
 #include <asm/proto.h>
 #include <asm/iommu.h>
 #include <asm/gart.h>
+#include <asm/dma.h>
 #include <asm/amd_iommu_proto.h>
 #include <asm/amd_iommu_types.h>
 #include <asm/amd_iommu.h>
@@ -2383,6 +2384,23 @@ static struct dma_map_ops amd_iommu_dma_ops = {
        .dma_supported = amd_iommu_dma_supported,
 };
 
+static unsigned device_dma_ops_init(void)
+{
+       struct pci_dev *pdev = NULL;
+       unsigned unhandled = 0;
+
+       for_each_pci_dev(pdev) {
+               if (!check_device(&pdev->dev)) {
+                       unhandled += 1;
+                       continue;
+               }
+
+               pdev->dev.archdata.dma_ops = &amd_iommu_dma_ops;
+       }
+
+       return unhandled;
+}
+
 /*
  * The function which clues the AMD IOMMU driver into dma_ops.
  */
@@ -2395,7 +2413,7 @@ void __init amd_iommu_init_api(void)
 int __init amd_iommu_init_dma_ops(void)
 {
        struct amd_iommu *iommu;
-       int ret;
+       int ret, unhandled;
 
        /*
         * first allocate a default protection domain for every IOMMU we
@@ -2421,7 +2439,11 @@ int __init amd_iommu_init_dma_ops(void)
        swiotlb = 0;
 
        /* Make the driver finally visible to the drivers */
-       dma_ops = &amd_iommu_dma_ops;
+       unhandled = device_dma_ops_init();
+       if (unhandled && max_pfn > MAX_DMA32_PFN) {
+               /* There are unhandled devices - initialize swiotlb for them */
+               swiotlb = 1;
+       }
 
        amd_iommu_stats_init();