[PATCH 5.17 568/772] iommu/mediatek: Fix 2 HW sharing pgtable issue

[Greg Kroah-Hartman]

From: Yong Wu <yong.wu@xxxxxxxxxxxx>

[ Upstream commit 645b87c190c959e9bb4f216b8c4add4ee880451a ]

In the 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. Fix this for the sharing pgtable case.

Only affect mt2712 which is the only SoC that share pgtable currently.

Fixes: 4f956c97d26b ("iommu/mediatek: Move domain_finalise into attach_device")
Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220503071427.2285-5-yong.wu@xxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/iommu/mtk_iommu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 5971a1168666..cf4e33db6a2d 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -451,7 +451,7 @@ static void mtk_iommu_domain_free(struct iommu_domain *domain)
 static int mtk_iommu_attach_device(struct iommu_domain *domain,
 				   struct device *dev)
 {
-	struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
+	struct mtk_iommu_data *data = dev_iommu_priv_get(dev), *frstdata;
 	struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 	struct device *m4udev = data->dev;
 	int ret, domid;
@@ -461,7 +461,10 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 		return domid;
 
 	if (!dom->data) {
-		if (mtk_iommu_domain_finalise(dom, data, domid))
+		/* Data is in the frstdata in sharing pgtable case. */
+		frstdata = mtk_iommu_get_m4u_data();
+
+		if (mtk_iommu_domain_finalise(dom, frstdata, domid))
 			return -ENODEV;
 		dom->data = data;
 	}
-- 
2.35.1