On 2017/10/18 21:00, Will Deacon wrote: > On Tue, Sep 12, 2017 at 09:00:37PM +0800, Zhen Lei wrote: >> This patch is base on: >> (add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing") >> >> Because iotlb_sync is moved out of ".unmap = arm_smmu_unmap", some interval >> ".unmap" calls should explicitly followed by a iotlb_sync operation. >> >> Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com> >> --- >> drivers/iommu/arm-smmu-v3.c | 10 ++++++++++ >> drivers/iommu/io-pgtable-arm.c | 30 ++++++++++++++++++++---------- >> drivers/iommu/io-pgtable.h | 1 + >> 3 files changed, 31 insertions(+), 10 deletions(-) >> >> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c >> index ef42c4b..e92828e 100644 >> --- a/drivers/iommu/arm-smmu-v3.c >> +++ b/drivers/iommu/arm-smmu-v3.c >> @@ -1772,6 +1772,15 @@ arm_smmu_unmap(struct iommu_domain *domain, unsigned >> long iova, size_t size) >> return ops->unmap(ops, iova, size); >> } >> >> +static void arm_smmu_iotlb_sync(struct iommu_domain *domain) >> +{ >> + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); >> + struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops; >> + >> + if (ops && ops->iotlb_sync) >> + ops->iotlb_sync(ops); >> +} >> + >> static phys_addr_t >> arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) >> { >> @@ -1991,6 +2000,7 @@ static struct iommu_ops arm_smmu_ops = { >> .attach_dev = arm_smmu_attach_dev, >> .map = arm_smmu_map, >> .unmap = arm_smmu_unmap, >> + .iotlb_sync = arm_smmu_iotlb_sync, >> .map_sg = default_iommu_map_sg, >> .iova_to_phys = arm_smmu_iova_to_phys, >> .add_device = arm_smmu_add_device, >> diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c >> index e8018a3..805efc9 100644 >> --- a/drivers/iommu/io-pgtable-arm.c >> +++ b/drivers/iommu/io-pgtable-arm.c >> @@ -304,6 +304,8 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable >> *data, >> WARN_ON(!selftest_running); >> return -EEXIST; >> } else if (iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_TABLE) { >> + size_t unmapped; >> + >> /* >> * We need to unmap and free the old table before >> * overwriting it with a block entry. >> @@ -312,7 +314,9 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable >> *data, >> size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data); >> >> tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data); >> - if (WARN_ON(__arm_lpae_unmap(data, iova, sz, lvl, tblp) != sz)) >> + unmapped = __arm_lpae_unmap(data, iova, sz, lvl, tblp); >> + io_pgtable_tlb_sync(&data->iop); >> + if (WARN_ON(unmapped != sz)) >> return -EINVAL; >> } >> >> @@ -584,7 +588,6 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable >> *data, >> /* Also flush any partial walks */ >> io_pgtable_tlb_add_flush(iop, iova, size, >> ARM_LPAE_GRANULE(data), false); >> - io_pgtable_tlb_sync(iop); >> ptep = iopte_deref(pte, data); >> __arm_lpae_free_pgtable(data, lvl + 1, ptep); >> } else { >> @@ -609,7 +612,6 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable >> *data, >> static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, >> size_t size) >> { >> - size_t unmapped; >> struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); >> arm_lpae_iopte *ptep = data->pgd; >> int lvl = ARM_LPAE_START_LVL(data); >> @@ -617,11 +619,14 @@ static int arm_lpae_unmap(struct io_pgtable_ops *ops, >> unsigned long iova, >> if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias))) >> return 0; >> >> - unmapped = __arm_lpae_unmap(data, iova, size, lvl, ptep); >> - if (unmapped) >> - io_pgtable_tlb_sync(&data->iop); >> + return __arm_lpae_unmap(data, iova, size, lvl, ptep); >> +} > > This change is already queued in Joerg's tree, due to a patch from Robin. Yes, I see. So this one can be skipped.
> > Will > > . > -- Thanks! BestRegards