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>

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 4fc31fc..6915235 100644 (file)
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -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;