Messages in this thread Patch in this message | | | From | Cho KyongHo <> | Subject | [PATCH v6 01/12] iommu/exynos: add missing cache flush for removed pagetable entries | Date | Wed, 26 Dec 2012 10:53:22 +0900 |
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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@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 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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