From: Milton Miller Date: Wed, 11 May 2011 12:24:57 +0000 (+0000) Subject: powerpc/pseries/iommu: Add additional checks when changing iommu mask X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=64ac822fb4554fb516bce123a38b35e04e41fff5;p=linux-beck.git 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 Signed-off-by: Nishanth Aravamudan Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 44d47ac552a9..05c101e7dcd7 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; }