* [PATCH v5 01/14] iommu/exynos: add missing cache flush for removed pagetable entries
@ 2012-12-11 11:07 Cho KyongHo
0 siblings, 0 replies; only message in thread
From: Cho KyongHo @ 2012-12-11 11:07 UTC (permalink / raw)
To: 'Linux ARM Kernel', 'Linux IOMMU',
'Linux Kernel', 'Linux Samsung SOC'
Cc: 'Dae Inki', 'Joerg Roedel', 'Kukjin Kim',
'Prathyush', 'Rahun Sharma',
'Sanghyun Lee', 'Subash Patel', 'SWKim'
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
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2012-12-11 11:08 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-12-11 11:07 [PATCH v5 01/14] iommu/exynos: add missing cache flush for removed pagetable entries Cho KyongHo
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®