FUJITA Tomonori wrote:
On Mon, 21 Jul 2008 10:15:22 -0400
Prarit Bhargava <prarit@xxxxxxxxxx> wrote:
(This didn't appear on LKML or any of the mirrors ... trying again)
It is possible that alloc_iommu()'s boundary_size overflows as
dma_get_seg_boundary can return 0xffffffff. In that case, further usage of
boundary_size triggers a BUG_ON() in the iommu code.
Did you actually hit this? pci-gart_64.c is used only by X86_64.
I hit this by declaring a device struct and not declaring a value for
dev->dma_parms->segment_boundary_mask.
I was attempting to alloc out of the IOMMU and the code then dies on the
bugcheck in iommu_is_span_boundary() because boundary_size = 0.
P.
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