On Thu, Aug 06, 2015 at 01:19:52PM -0600, Alex Williamson wrote:
> On Wed, 2015-08-05 at 17:18 +0200, Joerg Roedel wrote:
> > From: Joerg Roedel <jroe...@suse.de>
> >
> > Instead of searching in the domain array for already
> > allocated domain ids, keep track of them explicitly.
> >
> > Signed-off-by: Joerg Roedel <jroe...@suse.de>
> > ---
> > drivers/iommu/intel-iommu.c | 51
> > +++++++++++++++++++++++----------------------
> > 1 file changed, 26 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> > index 0649b94..c3c5167 100644
> > --- a/drivers/iommu/intel-iommu.c
> > +++ b/drivers/iommu/intel-iommu.c
> > @@ -378,6 +378,9 @@ struct dmar_domain {
> > DECLARE_BITMAP(iommu_bmp, DMAR_UNITS_SUPPORTED);
> > /* bitmap of iommus this domain uses*/
> >
> > + u16 iommu_did[DMAR_UNITS_SUPPORTED];
> > + /* Domain ids per IOMMU */
>
> Maybe a spec reference here to justify u16 that the 2.3 vt-d spec only
> supports up to 16bit domain IDs.
Makes sense, I added a reference to the VT-d spec, section 9.3.
> > + num = domain->iommu_did[iommu->seq_id];
> > +
> > + WARN_ON(num == 0);
>
> Return -ENODEV and let the caller decide if that's an error? Then we
> could safely call this over all all iommus.
Changed that too, but not -ENODEV but just a plain return. The callers
do not care about errors anyway.
Joerg
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