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Subject[PATCH v7 05/15] iommu: Use bitmap to calculate page size in iommu_pgsize()
Date
From: Will Deacon <will@kernel.org>

Avoid the potential for shifting values by amounts greater than the
width of their type by using a bitmap to compute page size in
iommu_pgsize().

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
---
drivers/iommu/iommu.c | 31 ++++++++++++-------------------
1 file changed, 12 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5419c4b9f27a..80e471ada358 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -8,6 +8,7 @@

#include <linux/device.h>
#include <linux/kernel.h>
+#include <linux/bits.h>
#include <linux/bug.h>
#include <linux/types.h>
#include <linux/init.h>
@@ -2378,30 +2379,22 @@ static size_t iommu_pgsize(struct iommu_domain *domain,
unsigned long addr_merge, size_t size)
{
unsigned int pgsize_idx;
+ unsigned long pgsizes;
size_t pgsize;

- /* Max page size that still fits into 'size' */
- pgsize_idx = __fls(size);
+ /* Page sizes supported by the hardware and small enough for @size */
+ pgsizes = domain->pgsize_bitmap & GENMASK(__fls(size), 0);

- /* need to consider alignment requirements ? */
- if (likely(addr_merge)) {
- /* Max page size allowed by address */
- unsigned int align_pgsize_idx = __ffs(addr_merge);
- pgsize_idx = min(pgsize_idx, align_pgsize_idx);
- }
-
- /* build a mask of acceptable page sizes */
- pgsize = (1UL << (pgsize_idx + 1)) - 1;
-
- /* throw away page sizes not supported by the hardware */
- pgsize &= domain->pgsize_bitmap;
+ /* Constrain the page sizes further based on the maximum alignment */
+ if (likely(addr_merge))
+ pgsizes &= GENMASK(__ffs(addr_merge), 0);

- /* make sure we're still sane */
- BUG_ON(!pgsize);
+ /* Make sure we have at least one suitable page size */
+ BUG_ON(!pgsizes);

- /* pick the biggest page */
- pgsize_idx = __fls(pgsize);
- pgsize = 1UL << pgsize_idx;
+ /* Pick the biggest page size remaining */
+ pgsize_idx = __fls(pgsizes);
+ pgsize = BIT(pgsize_idx);

return pgsize;
}
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