On Fri, Aug 09, 2019 at 06:07:52PM +0100, Robin Murphy wrote: > Allocating and initialising a context for a domain is another point > where certain implementations are known to want special behaviour. > Currently the other half of the Cavium workaround comes into play here, > so let's finish the job to get the whole thing right out of the way. > > Signed-off-by: Robin Murphy <robin.mur...@arm.com> > --- > drivers/iommu/arm-smmu-impl.c | 39 +++++++++++++++++++++++++-- > drivers/iommu/arm-smmu.c | 51 +++++++---------------------------- > drivers/iommu/arm-smmu.h | 42 +++++++++++++++++++++++++++-- > 3 files changed, 86 insertions(+), 46 deletions(-) > > diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c > index c8904da08354..7a657d47b6ec 100644 > --- a/drivers/iommu/arm-smmu-impl.c > +++ b/drivers/iommu/arm-smmu-impl.c > @@ -48,6 +48,12 @@ const struct arm_smmu_impl calxeda_impl = { > }; > > > +struct cavium_smmu { > + struct arm_smmu_device smmu; > + u32 id_base; > +}; > +#define to_csmmu(s) container_of(s, struct cavium_smmu, smmu)
To be honest with you, I'd just use container_of directly for the two callsites that need it. "to_csmmu" isn't a great name when we're also got the calxeda thing in here. > static int cavium_cfg_probe(struct arm_smmu_device *smmu) > { > static atomic_t context_count = ATOMIC_INIT(0); > @@ -56,17 +62,46 @@ static int cavium_cfg_probe(struct arm_smmu_device *smmu) > * Ensure ASID and VMID allocation is unique across all SMMUs in > * the system. > */ > - smmu->cavium_id_base = atomic_fetch_add(smmu->num_context_banks, > + to_csmmu(smmu)->id_base = atomic_fetch_add(smmu->num_context_banks, > &context_count); > dev_notice(smmu->dev, "\tenabling workaround for Cavium erratum > 27704\n"); > > return 0; > } > > +int cavium_init_context(struct arm_smmu_domain *smmu_domain) > +{ > + u32 id_base = to_csmmu(smmu_domain->smmu)->id_base; > + > + if (smmu_domain->stage == ARM_SMMU_DOMAIN_S2) > + smmu_domain->cfg.vmid += id_base; > + else > + smmu_domain->cfg.asid += id_base; > + > + return 0; > +} > + > const struct arm_smmu_impl cavium_impl = { > .cfg_probe = cavium_cfg_probe, > + .init_context = cavium_init_context, > }; > > +struct arm_smmu_device *cavium_smmu_impl_init(struct arm_smmu_device *smmu) > +{ > + struct cavium_smmu *csmmu; > + > + csmmu = devm_kzalloc(smmu->dev, sizeof(*csmmu), GFP_KERNEL); > + if (!csmmu) > + return ERR_PTR(-ENOMEM); > + > + csmmu->smmu = *smmu; > + csmmu->smmu.impl = &cavium_impl; > + > + devm_kfree(smmu->dev, smmu); > + > + return &csmmu->smmu; > +} > + > > #define ARM_MMU500_ACTLR_CPRE (1 << 1) > > @@ -121,7 +156,7 @@ struct arm_smmu_device *arm_smmu_impl_init(struct > arm_smmu_device *smmu) > smmu->impl = &calxeda_impl; > > if (smmu->model == CAVIUM_SMMUV2) > - smmu->impl = &cavium_impl; > + return cavium_smmu_impl_init(smmu); > > if (smmu->model == ARM_MMU500) > smmu->impl = &arm_mmu500_impl; Maybe rework this so we do the calxeda detection first (and return if we match), followed by a switch on smmu->model to make it crystal clear that we match only one? Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu