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powerpc/pseries/iommu: Add additional checks when changing iommu mask 

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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Milton Miller 2011-05-11 12:24:57 +00:00 committed by Benjamin Herrenschmidt
parent 23a6c48404
commit 64ac822fb4
1 changed files with 11 additions and 4 deletions
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15
arch/powerpc/platforms/pseries/iommu.c
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@ -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;
}