| Message ID | 1562612447-19856-4-git-send-email-jcrouse@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iommu/arm-smmu: Split pagetable support | expand |
On 08/07/2019 20:00, Jordan Crouse wrote: > When DOMAIN_ATTR_SPLIT_TABLES is specified for pass ARM_64_LPAE_SPLIT_S1 > to io_pgtable_ops to allocate and initialize TTBR0 and TTBR1 pagetables. > > v3: Moved all the pagetable specific work into io-pgtable-arm > in a previous patch. > > Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> > --- > > drivers/iommu/arm-smmu.c | 16 +++++++++++++++- > 1 file changed, 15 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c > index 653b6b3..7a6b4bb 100644 > --- a/drivers/iommu/arm-smmu.c > +++ b/drivers/iommu/arm-smmu.c > @@ -257,6 +257,7 @@ struct arm_smmu_domain { > bool non_strict; > struct mutex init_mutex; /* Protects smmu pointer */ > spinlock_t cb_lock; /* Serialises ATS1* ops and TLB syncs */ > + u32 attributes; > struct iommu_domain domain; > }; > > @@ -832,7 +833,11 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, > ias = smmu->va_size; > oas = smmu->ipa_size; > if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH64) { > - fmt = ARM_64_LPAE_S1; > + if (smmu_domain->attributes & > + (1 << DOMAIN_ATTR_SPLIT_TABLES)) > + fmt = ARM_64_LPAE_SPLIT_S1; > + else > + fmt = ARM_64_LPAE_S1; > } else if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_L) { > fmt = ARM_32_LPAE_S1; > ias = min(ias, 32UL); > @@ -1582,6 +1587,10 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, > case DOMAIN_ATTR_NESTING: > *(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED); > return 0; > + case DOMAIN_ATTR_SPLIT_TABLES: > + *(int *)data = !!(smmu_domain->attributes & > + (1 << DOMAIN_ATTR_SPLIT_TABLES)); I'm not really a fan of always claiming to support this but silently ignoring it depending on hardware/kernel configuration - it seems somewhat tricky to make callers properly robust against making false assumptions (e.g. consider if the system is booted with "arm-smmu.force_stage=2"). Robin. > + return 0; > default: > return -ENODEV; > } > @@ -1622,6 +1631,11 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain, > else > smmu_domain->stage = ARM_SMMU_DOMAIN_S1; > break; > + case DOMAIN_ATTR_SPLIT_TABLES: > + if (*((int *)data)) > + smmu_domain->attributes |= > + (1 << DOMAIN_ATTR_SPLIT_TABLES); > + break; > default: > ret = -ENODEV; > } >
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 653b6b3..7a6b4bb 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -257,6 +257,7 @@ struct arm_smmu_domain { bool non_strict; struct mutex init_mutex; /* Protects smmu pointer */ spinlock_t cb_lock; /* Serialises ATS1* ops and TLB syncs */ + u32 attributes; struct iommu_domain domain; }; @@ -832,7 +833,11 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, ias = smmu->va_size; oas = smmu->ipa_size; if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH64) { - fmt = ARM_64_LPAE_S1; + if (smmu_domain->attributes & + (1 << DOMAIN_ATTR_SPLIT_TABLES)) + fmt = ARM_64_LPAE_SPLIT_S1; + else + fmt = ARM_64_LPAE_S1; } else if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_L) { fmt = ARM_32_LPAE_S1; ias = min(ias, 32UL); @@ -1582,6 +1587,10 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, case DOMAIN_ATTR_NESTING: *(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED); return 0; + case DOMAIN_ATTR_SPLIT_TABLES: + *(int *)data = !!(smmu_domain->attributes & + (1 << DOMAIN_ATTR_SPLIT_TABLES)); + return 0; default: return -ENODEV; } @@ -1622,6 +1631,11 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain, else smmu_domain->stage = ARM_SMMU_DOMAIN_S1; break; + case DOMAIN_ATTR_SPLIT_TABLES: + if (*((int *)data)) + smmu_domain->attributes |= + (1 << DOMAIN_ATTR_SPLIT_TABLES); + break; default: ret = -ENODEV; }
When DOMAIN_ATTR_SPLIT_TABLES is specified for pass ARM_64_LPAE_SPLIT_S1 to io_pgtable_ops to allocate and initialize TTBR0 and TTBR1 pagetables. v3: Moved all the pagetable specific work into io-pgtable-arm in a previous patch. Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> --- drivers/iommu/arm-smmu.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)