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authorRobin Murphy <robin.murphy@arm.com>2019-10-25 21:08:31 +0300
committerWill Deacon <will@kernel.org>2019-11-04 22:34:31 +0300
commitf7b90d2c7422a815c094961751582347935045cd (patch)
tree7cdd6c7645b516a841b276fe6ea12cd581ba8f68 /drivers/iommu/io-pgtable-arm.c
parentb5813c164ec82790be892b0f8e79cf080a503706 (diff)
downloadlinux-f7b90d2c7422a815c094961751582347935045cd.tar.xz
iommu/io-pgtable-arm: Rationalise size check
It makes little sense to only validate the requested size after we think we've found a matching block size - making the check up-front is simple, and far more logical than waiting to walk off the bottom of the table to infer that we must have been passed a bogus size to start with. We're missing an equivalent check on the unmap path, so add that as well for consistency. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/io-pgtable-arm.c')
-rw-r--r--drivers/iommu/io-pgtable-arm.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index c5c4f247acb4..abe794576e8f 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -392,7 +392,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
/* If we can install a leaf entry at this level, then do so */
- if (size == block_size && (size & cfg->pgsize_bitmap))
+ if (size == block_size)
return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep);
/* We can't allocate tables at the final level */
@@ -479,6 +479,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t size, int iommu_prot)
{
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
arm_lpae_iopte *ptep = data->pgd;
int ret, lvl = ARM_LPAE_START_LVL(data);
arm_lpae_iopte prot;
@@ -487,6 +488,9 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
return 0;
+ if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
+ return -EINVAL;
+
if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
paddr >= (1ULL << data->iop.cfg.oas)))
return -ERANGE;
@@ -652,9 +656,13 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
size_t size, struct iommu_iotlb_gather *gather)
{
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
arm_lpae_iopte *ptep = data->pgd;
int lvl = ARM_LPAE_START_LVL(data);
+ if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
+ return 0;
+
if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias)))
return 0;