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From bc5501f6b0afe076af0f30845221dbb4834c6ed4 Mon Sep 17 00:00:00 2001
From: Cho KyongHo <pullip.cho@samsung.com>
Date: Fri, 26 Jul 2013 20:26:28 +0900
Subject: [PATCH 0016/1302] iommu/exynos: add missing cache flush for removed
page table entries
This commit adds cache flush for removed small 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: Cho KyongHo <pullip.cho@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
---
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 233f382..e3be3e5 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;
size = SPAGE_SIZE;
+ pgtable_flush(ent, ent +1);
priv->lv2entcnt[lv1ent_offset(iova)] += 1;
goto done;
}
@@ -1010,6 +1011,7 @@ 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;
--
1.8.3.2
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