* [PATCH v7 2/9] iommu/exynos: add missing cache flush for removed page table entries
@ 2013-07-05 12:29 Cho KyongHo
0 siblings, 0 replies; only message in thread
From: Cho KyongHo @ 2013-07-05 12:29 UTC (permalink / raw)
To: 'Linux ARM Kernel', 'Linux IOMMU',
'Linux Kernel', 'Linux Samsung SOC'
Cc: 'Hyunwoong Kim', 'Joerg Roedel',
'Kukjin Kim', 'Prathyush', 'Rahul Sharma',
'Subash Patel', 'Keyyoung Park',
'Grant Grundler'
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>
---
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
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