Messages in this thread Patch in this message | | | From | Zhen Lei <> | Subject | [PATCH v2 2/3] iommu/arm-smmu-v3: add support for unmap an iova range with only one tlb sync | Date | Tue, 12 Sep 2017 21:00:37 +0800 |
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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.leizhen@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); +} + +static void arm_lpae_iotlb_sync(struct io_pgtable_ops *ops) +{ + struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); - return unmapped; + io_pgtable_tlb_sync(&data->iop); } static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, @@ -734,6 +739,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg) data->iop.ops = (struct io_pgtable_ops) { .map = arm_lpae_map, .unmap = arm_lpae_unmap, + .iotlb_sync = arm_lpae_iotlb_sync, .iova_to_phys = arm_lpae_iova_to_phys, }; @@ -1030,7 +1036,7 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg) int i, j; unsigned long iova; - size_t size; + size_t size, unmapped; struct io_pgtable_ops *ops; selftest_running = true; @@ -1082,7 +1088,9 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg) /* Partial unmap */ size = 1UL << __ffs(cfg->pgsize_bitmap); - if (ops->unmap(ops, SZ_1G + size, size) != size) + unmapped = ops->unmap(ops, SZ_1G + size, size); + ops->iotlb_sync(ops); + if (unmapped != size) return __FAIL(ops, i); /* Remap of partial unmap */ @@ -1098,7 +1106,9 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg) while (j != BITS_PER_LONG) { size = 1UL << j; - if (ops->unmap(ops, iova, size) != size) + unmapped = ops->unmap(ops, iova, size); + ops->iotlb_sync(ops); + if (unmapped != size) return __FAIL(ops, i); if (ops->iova_to_phys(ops, iova + 42)) diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h index a3e6670..3a72e08 100644 --- a/drivers/iommu/io-pgtable.h +++ b/drivers/iommu/io-pgtable.h @@ -120,6 +120,7 @@ struct io_pgtable_ops { phys_addr_t paddr, size_t size, int prot); int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova, size_t size); + void (*iotlb_sync)(struct io_pgtable_ops *ops); phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops, unsigned long iova); }; -- 2.5.0
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