diff options
| -rw-r--r-- | drivers/iommu/io-pgtable-arm.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index a286c5404ea7..40c1cd079f8e 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -1394,6 +1394,23 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg) iova += SZ_1G; } + /* + * Map/unmap the last largest supported page of the IAS, this can + * trigger corner cases in the concatednated page tables. + */ + mapped = 0; + size = 1UL << __fls(cfg->pgsize_bitmap); + iova = (1UL << cfg->ias) - size; + if (ops->map_pages(ops, iova, iova, size, 1, + IOMMU_READ | IOMMU_WRITE | + IOMMU_NOEXEC | IOMMU_CACHE, + GFP_KERNEL, &mapped)) + return __FAIL(ops, i); + if (mapped != size) + return __FAIL(ops, i); + if (ops->unmap_pages(ops, iova, size, 1, NULL) != size) + return __FAIL(ops, i); + free_io_pgtable_ops(ops); } |