This commit adds cache flush for removed small page and large page
entries in exynos_iommu_unmap(). Missing cache flush of removed
page table entries can cause missing page fault interrupt when a
master IP accesses an unmapped area.
Signed-off-by: KyongHo Cho <pullip.cho@xxxxxxxxxxx>
---
drivers/iommu/exynos-iommu.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 7fe44f8..b96f3b9 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1002,6 +1002,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain,
if (lv2ent_small(ent)) {
*ent = 0;
+ pgtable_flush(ent, ent + 1);
size = SPAGE_SIZE;
priv->lv2entcnt[lv1ent_offset(iova)] += 1;
goto done;
@@ -1011,6 +1012,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain,
BUG_ON(size < LPAGE_SIZE);
memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
+ pgtable_flush(ent, ent + SPAGES_PER_LPAGE);
size = LPAGE_SIZE;
priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
--
1.8.0
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