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    SubjectRe: Problems with alpha/pci + radeon/ttm
    From
    On Thu, 24 Jun 2010 10:53:52 -0400
    Matt Turner <mattst88@gmail.com> wrote:

    > > Seems that the IOMMU can't find 128 pages. It's likely due to:
    > >
    > > - out of the IOMMU space (possibly someone doesn't free the IOMMU
    > >  space).
    > >
    > > or
    > >
    > > - the mapping parameters (such as align) aren't appropriate so the
    > >  IOMMU can't find space.
    > >
    > >
    > >> Is this the cause of the bug we're seeing in the report [1]?
    > >>
    > >> Anyone know what's going wrong here?
    > >
    > >
    > > I've attached a patch to print the debug info about the mapping
    > > parameters.
    > >
    > >
    > > diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
    > > index d1dbd9a..17cf0d8 100644
    > > --- a/arch/alpha/kernel/pci_iommu.c
    > > +++ b/arch/alpha/kernel/pci_iommu.c
    > > @@ -187,6 +187,10 @@ iommu_arena_alloc(struct device *dev, struct pci_iommu_arena *arena, long n,
    > >        /* Search for N empty ptes */
    > >        ptes = arena->ptes;
    > >        mask = max(align, arena->align_entry) - 1;
    > > +
    > > +       printk("%s: %p, %p, %d, %ld, %lx, %u\n", __func__, dev, arena, arena->size,
    > > +              n, mask, align);
    > > +
    > >        p = iommu_arena_find_pages(dev, arena, n, mask);
    > >        if (p < 0) {
    > >                spin_unlock_irqrestore(&arena->lock, flags);
    >
    > Using this patch, I log the attached output.

    Your system has 1GB iommu address space. I guess that it's enough for
    KSM?

    The parameters in the log looks good. But you got this log before you
    started X?
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