linux-kernel - [PATCH 03/24] iommu/mediatek: Fix 2 HW sharing pgtable issue

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Message-ID: <20210630023504.18177-4-yong.wu@mediatek.com>
Date:   Wed, 30 Jun 2021 10:34:43 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <chao.hao@...iatek.com>
Subject: [PATCH 03/24] iommu/mediatek: Fix 2 HW sharing pgtable issue

In the this commit 4f956c97d26b ("iommu/mediatek: Move domain_finalise
into attach_device"), I overlooked the sharing pgtable case.
After that commit, the "data" in the mtk_iommu_domain_finalise always is
the data of the current IOMMU HW, If it's sharing pgtable case, here is
not right. This patch fix this. In sharing pgable case, we will loop the
list to find if there already is the exist domain.

this only affect mt2712 which is the only SoC that sharing pgtable.

Fixes: 4f956c97d26b ("iommu/mediatek: Move domain_finalise into attach_device")
Signed-off-by: Chao Hao <chao.hao@...iatek.com>
Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index e06b8a0e2b56..013dbcc87d49 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -390,12 +390,19 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
 				     unsigned int domid)
 {
 	const struct mtk_iommu_iova_region *region;
+	struct mtk_iommu_data *tmpdata;
 
-	/* Use the exist domain as there is only one pgtable here. */
-	if (data->m4u_dom) {
-		dom->iop = data->m4u_dom->iop;
-		dom->cfg = data->m4u_dom->cfg;
-		dom->domain.pgsize_bitmap = data->m4u_dom->cfg.pgsize_bitmap;
+	/*
+	 * Loop to find if there is already the exist domain.
+	 * Use it when 2 iommu HWs share the pgtable.
+	 */
+	for_each_m4u(tmpdata) {
+		if (!tmpdata->m4u_dom)
+			continue;
+
+		dom->iop = tmpdata->m4u_dom->iop;
+		dom->cfg = tmpdata->m4u_dom->cfg;
+		dom->domain.pgsize_bitmap = tmpdata->m4u_dom->cfg.pgsize_bitmap;
 		goto update_iova_region;
 	}
 
-- 
2.18.0