mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-09 09:01:36 -04:00
Code Issues Packages Projects Releases Wiki Activity

iommu/io-pgtable-arm: Add self test for the last page in the IAS

Browse Source 
Add a case in the selftests that can detect some bugs with concatenated
page tables, where it maps the biggest supported page size at the end of
the IAS, this test would fail without the previous fix.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Link: https://lore.kernel.org/r/20241024162516.2005652-3-smostafa@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mostafa Saleh
2024-10-24 16:25:16 +00:00
committed by Will Deacon
parent d71fa842d3
commit d64c805337
1 changed files with 17 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/iommu/io-pgtable-arm.c
View File

@@ -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);
}