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iommu/exynos: Add missing cache flush for removed page table entries
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>
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@ -904,6 +904,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain,
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if (lv2ent_small(ent)) {
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*ent = 0;
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size = SPAGE_SIZE;
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pgtable_flush(ent, ent + 1);
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priv->lv2entcnt[lv1ent_offset(iova)] += 1;
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goto done;
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}
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@ -915,6 +916,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain,
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}
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memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
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pgtable_flush(ent, ent + SPAGES_PER_LPAGE);
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size = LPAGE_SIZE;
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priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
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