[PATCH v7 2/9] iommu/exynos: add missing cache flush for removed page table entries
From: Cho KyongHo <hidden>
Date: 2013-07-05 12:29:20
Also in:
linux-iommu, linux-samsung-soc, lkml
Subsystem:
exynos sysmmu (iommu) driver, iommu subsystem, the rest · Maintainers:
Marek Szyprowski, Joerg Roedel, Will Deacon, Linus Torvalds
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 <redacted> --- drivers/iommu/exynos-iommu.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
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;
--
1.7.2.5