Hi Robin, On 04/13/2016 04:46 PM, Robin Murphy wrote: > Until we get fully plumbed into of_iommu_configure, our default > IOMMU_DOMAIN_DMA domains just bypass translation. Since we achieve that > by leaving the stream table entries set to bypass instead of pointing at > a translation context, the context bank we allocate for the domain is > completely wasted. Context banks are typically a rather limited > resource, so don't hog ones we don't need. > Thanks for this fix. I recovered the ability to assign more than VFs on Overdrive HW.
Tested-by: Eric Auger <[email protected]> Best Regards Eric > Reported-by: Eric Auger <[email protected]> > Signed-off-by: Robin Murphy <[email protected]> > --- > drivers/iommu/arm-smmu.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c > index 5158feb..7c39ac4 100644 > --- a/drivers/iommu/arm-smmu.c > +++ b/drivers/iommu/arm-smmu.c > @@ -826,6 +826,12 @@ static int arm_smmu_init_domain_context(struct > iommu_domain *domain, > if (smmu_domain->smmu) > goto out_unlock; > > + /* We're bypassing these SIDs, so don't allocate an actual context */ > + if (domain->type == IOMMU_DOMAIN_DMA) { > + smmu_domain->smmu = smmu; > + goto out_unlock; > + } > + > /* > * Mapping the requested stage onto what we support is surprisingly > * complicated, mainly because the spec allows S1+S2 SMMUs without > @@ -948,7 +954,7 @@ static void arm_smmu_destroy_domain_context(struct > iommu_domain *domain) > void __iomem *cb_base; > int irq; > > - if (!smmu) > + if (!smmu || domain->type == IOMMU_DOMAIN_DMA) > return; > > /* > _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
