diff mbox

[1/8] pseries/iommu: add additional checks when changing iommu mask

Message ID 1305152704-4864-2-git-send-email-nacc@us.ibm.com (mailing list archive)
State Accepted, archived
Commit 64ac822fb4554fb516bce123a38b35e04e41fff5
Delegated to: Benjamin Herrenschmidt
Headers show

Commit Message

Nishanth Aravamudan May 11, 2011, 10:24 p.m. UTC 
From: Milton Miller <miltonm@bga.com>

Do not check dma supported until we have chosen the right dma ops.
Check that the device is pci before treating it as such.

Check the mask is supported by the selected dma ops before
committing it.

We only need to set iommu ops if it is not the current ops; this
avoids searching the tree for the iommu table unnecessarily.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
---
 arch/powerpc/platforms/pseries/iommu.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 44d47ac..05c101e 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -1026,9 +1026,12 @@  static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask)
 	const void *dma_window = NULL;
 	u64 dma_offset;
 
-	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+	if (!dev->dma_mask)
 		return -EIO;
 
+	if (!dev_is_pci(dev))
+		goto check_mask;
+
 	pdev = to_pci_dev(dev);
 
 	/* only attempt to use a new window if 64-bit DMA is requested */
@@ -1059,13 +1062,17 @@  static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask)
 		}
 	}
 
-	/* fall-through to iommu ops */
-	if (!ddw_enabled) {
-		dev_info(dev, "Using 32-bit DMA via iommu\n");
+	/* fall back on iommu ops, restore table pointer with ops */
+	if (!ddw_enabled && get_dma_ops(dev) != &dma_iommu_ops) {
+		dev_info(dev, "Restoring 32-bit DMA via iommu\n");
 		set_dma_ops(dev, &dma_iommu_ops);
 		pci_dma_dev_setup_pSeriesLP(pdev);
 	}
 
+check_mask:
+	if (!dma_supported(dev, dma_mask))
+		return -EIO;
+
 	*dev->dma_mask = dma_mask;
 	return 0;
 }