Date: Mon, 07 Oct 2013 10:52:43 +0900
From: Cho KyongHo <pullip.cho@samsung.com>
To: Linux ARM Kernel <linux-arm-kernel@lists.infradead.org>,
        Linux DeviceTree <devicetree@vger.kernel.org>,
        Linux IOMMU <iommu@lists.linux-foundation.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>
Cc: Antonios Motakis <a.motakis@virtualopensystems.com>,
        Grant Grundler <grundler@chromium.org>, Joerg Roedel <joro@8bytes.org>,
        Kukjin Kim <kgene.kim@samsung.com>,
        Prathyush <prathyush.k@samsung.com>,
        Rahul Sharma <rahul.sharma@samsung.com>,
        Sachin Kamat <sachin.kamat@linaro.org>,
        Subash Patel <supash.ramaswamy@linaro.org>,
        Varun Sethi <Varun.Sethi@freescale.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Tomasz Figa <t.figa@samsung.com>
Subject: [PATCH v10 02/20] iommu/exynos: add missing cache flush for removed
 page table entries
Message-id: <20131007105243.bfb2983f50d37183d3362f14@samsung.com>
MIME-version: 1.0
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7bit
DLP-Filter: Pass
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1436
Lines: 40

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>
---
 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 4876d35..1c3a397 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -958,6 +958,7 @@ 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;
 	}
@@ -966,6 +967,7 @@ 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/