On Thu, 24 Jun 2010 10:53:52 -0400
Matt Turner <mattst88@xxxxxxxxx> 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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