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Signed-off-by: Rob Clark --- drivers/iommu/io-pgtable-arm.c | 51 ++++++++++++++++++++++++++++------ include/linux/io-pgtable.h | 4 +++ 2 files changed, 46 insertions(+), 9 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index f7828a7aad41..f47a0e64bb35 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -693,17 +693,19 @@ static size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iov data->start_level, ptep); } -static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, - unsigned long iova) +static int arm_lpae_pgtable_walk(struct io_pgtable_ops *ops, unsigned long iova, + int (*cb)(void *cb_data, void *pte, int level), + void *cb_data) { struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); arm_lpae_iopte pte, *ptep = data->pgd; int lvl = data->start_level; + int ret; do { /* Valid IOPTE pointer? */ if (!ptep) - return 0; + return -EFAULT; /* Grab the IOPTE we're interested in */ ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); @@ -711,22 +713,52 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, /* Valid entry? */ if (!pte) - return 0; + return -EFAULT; + + ret = cb(cb_data, &pte, lvl); + if (ret) + return ret; - /* Leaf entry? */ + /* Leaf entry? If so, we've found the translation */ if (iopte_leaf(pte, lvl, data->iop.fmt)) - goto found_translation; + return 0; /* Take it to the next level */ ptep = iopte_deref(pte, data); } while (++lvl < ARM_LPAE_MAX_LEVELS); /* Ran out of page tables to walk */ + return -EFAULT; +} + +struct iova_to_phys_walk_data { + arm_lpae_iopte pte; + int level; +}; + +static int iova_to_phys_walk_cb(void *cb_data, void *pte, int level) +{ + struct iova_to_phys_walk_data *d = cb_data; + + d->pte = *(arm_lpae_iopte *)pte; + d->level = level; + return 0; +} + +static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops, + unsigned long iova) +{ + struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); + struct iova_to_phys_walk_data d; + int ret; + + ret = arm_lpae_pgtable_walk(ops, iova, iova_to_phys_walk_cb, &d); + if (ret) + return 0; -found_translation: - iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1); - return iopte_to_paddr(pte, data) | iova; + iova &= (ARM_LPAE_BLOCK_SIZE(d.level, data) - 1); + return iopte_to_paddr(d.pte, data) | iova; } static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg) @@ -807,6 +839,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg) .map_pages = arm_lpae_map_pages, .unmap_pages = arm_lpae_unmap_pages, .iova_to_phys = arm_lpae_iova_to_phys, + .pgtable_walk = arm_lpae_pgtable_walk, }; return data; diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 86cf1f7ae389..261b48af068a 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -177,6 +177,7 @@ struct io_pgtable_cfg { * @map_pages: Map a physically contiguous range of pages of the same size. * @unmap_pages: Unmap a range of virtually contiguous pages of the same size. * @iova_to_phys: Translate iova to physical address. + * @pgtable_walk: (optional) Perform a page table walk for a given iova. * * These functions map directly onto the iommu_ops member functions with * the same names. @@ -190,6 +191,9 @@ struct io_pgtable_ops { struct iommu_iotlb_gather *gather); phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops, unsigned long iova); + int (*pgtable_walk)(struct io_pgtable_ops *ops, unsigned long iova, + int (*cb)(void *cb_data, void *pte, int level), + void *cb_data); int (*read_and_clear_dirty)(struct io_pgtable_ops *ops, unsigned long iova, size_t size, unsigned long flags, -- 2.45.1