| Message ID | 1533558424-16748-5-git-send-email-thunder.leizhen@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | add non-strict mode support for arm-smmu-v3 | expand |
On 06/08/18 13:27, Zhen Lei wrote: > Dynamically choose strict or non-strict mode for page table config based > on the iommu domain type. > > Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> > --- > drivers/iommu/arm-smmu-v3.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > index 2f1304b..904bc1e 100644 > --- a/drivers/iommu/arm-smmu-v3.c > +++ b/drivers/iommu/arm-smmu-v3.c > @@ -1622,6 +1622,11 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain) > if (smmu->features & ARM_SMMU_FEAT_COHERENCY) > pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA; > > + if (domain->type == IOMMU_DOMAIN_DMA) { > + domain->non_strict = 1; > + pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT; > + } > + > pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain); > if (!pgtbl_ops) > return -ENOMEM; > @@ -1782,7 +1787,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain) > { > struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu; > > - if (smmu) > + if (smmu && !domain->non_strict) That doesn't smell right - even in non-strict domains we still need stuff like walk cache invalidations for non-leaf unmaps to be synchronous, so we can't just ignore all sync operations at the driver level. I think the right thing to do to elide the "normal" sync on unmap is to first convert __iommu_dma_unmap to use iommu_unmap_fast()/iommu_tlb_sync(), then make it not issue that sync at all for non-strict domains. Robin. > __arm_smmu_tlb_sync(smmu); > } > > -- > 1.8.3 > >
On 2018/8/9 19:06, Robin Murphy wrote: > On 06/08/18 13:27, Zhen Lei wrote: >> Dynamically choose strict or non-strict mode for page table config based >> on the iommu domain type. >> >> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> >> --- >> drivers/iommu/arm-smmu-v3.c | 7 ++++++- >> 1 file changed, 6 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c >> index 2f1304b..904bc1e 100644 >> --- a/drivers/iommu/arm-smmu-v3.c >> +++ b/drivers/iommu/arm-smmu-v3.c >> @@ -1622,6 +1622,11 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain) >> if (smmu->features & ARM_SMMU_FEAT_COHERENCY) >> pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA; >> >> + if (domain->type == IOMMU_DOMAIN_DMA) { >> + domain->non_strict = 1; >> + pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT; >> + } >> + >> pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain); >> if (!pgtbl_ops) >> return -ENOMEM; >> @@ -1782,7 +1787,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain) >> { >> struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu; >> >> - if (smmu) >> + if (smmu && !domain->non_strict) > > That doesn't smell right - even in non-strict domains we still need stuff like walk cache invalidations for non-leaf unmaps to be synchronous, so we can't just ignore all sync operations at the driver level. I think the right thing to do to elide the "normal" sync on unmap is to first convert __iommu_dma_unmap to use iommu_unmap_fast()/iommu_tlb_sync(), then make it not issue that sync at all for non-strict domains. OK, I will try it. > > Robin. > >> __arm_smmu_tlb_sync(smmu); >> } >> >> -- >> 1.8.3 >> >> > > . >
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 2f1304b..904bc1e 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1622,6 +1622,11 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain) if (smmu->features & ARM_SMMU_FEAT_COHERENCY) pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA; + if (domain->type == IOMMU_DOMAIN_DMA) { + domain->non_strict = 1; + pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT; + } + pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain); if (!pgtbl_ops) return -ENOMEM; @@ -1782,7 +1787,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain) { struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu; - if (smmu) + if (smmu && !domain->non_strict) __arm_smmu_tlb_sync(smmu); }
Dynamically choose strict or non-strict mode for page table config based on the iommu domain type. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> --- drivers/iommu/arm-smmu-v3.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) -- 1.8.3