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iommu/exynos: Add missing cache flush for removed page table entries

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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.

Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Tested-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>
Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Cho KyongHo 2014-05-12 11:44:51 +05:30 committed by Joerg Roedel
parent 8f8fcf970e
commit 6cb47ed739
1 changed files with 2 additions and 0 deletions
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2
drivers/iommu/exynos-iommu.c
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@ -904,6 +904,7 @@ 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;
}
@ -915,6 +916,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain,
}
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;