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powerpc/dma-iommu: Fix IOMMU window check

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Checking for device mask to cover the whole IOMMU table is too strict.
IOMMU allocators should handle mask constraint properly for each
allocation.

The patch enables to use old AirPort Extreme cards on PowerMacs with
more than 1GB of memory; without the patch the driver init fails with:

  b43-pci-bridge 0001:01:01.0: Warning: IOMMU window too big for device mask
  b43-pci-bridge 0001:01:01.0: mask: 0x3fffffff, table end: 0x80000000
  b43-phy0 ERROR: The machine/kernel does not support the required 30-bit DMA mask

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aaro Koskinen 2012-08-18 07:34:15 +00:00 committed by Benjamin Herrenschmidt
parent f0f0c9ac20
commit 4c374af5fd
1 changed files with 4 additions and 5 deletions
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9
arch/powerpc/kernel/dma-iommu.c
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@ -83,11 +83,10 @@ static int dma_iommu_dma_supported(struct device *dev, u64 mask)
return 0;
}
if ((tbl->it_offset + tbl->it_size) > (mask >> IOMMU_PAGE_SHIFT)) {
dev_info(dev, "Warning: IOMMU window too big for device mask\n");
dev_info(dev, "mask: 0x%08llx, table end: 0x%08lx\n",
mask, (tbl->it_offset + tbl->it_size) <<
IOMMU_PAGE_SHIFT);
if (tbl->it_offset > (mask >> IOMMU_PAGE_SHIFT)) {
dev_info(dev, "Warning: IOMMU offset too big for device mask\n");
dev_info(dev, "mask: 0x%08llx, table offset: 0x%08lx\n",
mask, tbl->it_offset << IOMMU_PAGE_SHIFT);
return 0;
} else
return 1;