linux-kernel - [PATCH v4 03/20] iommu/tegra: gart: Ignore devices without IOMMU phandle in DT

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Message-Id: <20180924004153.8232-4-digetx@gmail.com>
Date:   Mon, 24 Sep 2018 03:41:36 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 03/20] iommu/tegra: gart: Ignore devices without IOMMU phandle in DT

GART can't handle all devices, hence ignore devices that aren't related
to GART. IOMMU phandle must be explicitly assign to devices in the device
tree.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/iommu/tegra-gart.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index e9524ed264cf..f6cf5cd5aaca 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -342,8 +342,12 @@ static bool gart_iommu_capable(enum iommu_cap cap)
 
 static int gart_iommu_add_device(struct device *dev)
 {
-	struct iommu_group *group = iommu_group_get_for_dev(dev);
+	struct iommu_group *group;
 
+	if (!dev->iommu_fwspec)
+		return -ENODEV;
+
+	group = iommu_group_get_for_dev(dev);
 	if (IS_ERR(group))
 		return PTR_ERR(group);
 
@@ -360,6 +364,12 @@ static void gart_iommu_remove_device(struct device *dev)
 	iommu_device_unlink(&gart_handle->iommu, dev);
 }
 
+static int gart_iommu_of_xlate(struct device *dev,
+			       struct of_phandle_args *args)
+{
+	return 0;
+}
+
 static const struct iommu_ops gart_iommu_ops = {
 	.capable	= gart_iommu_capable,
 	.domain_alloc	= gart_iommu_domain_alloc,
@@ -373,6 +383,7 @@ static const struct iommu_ops gart_iommu_ops = {
 	.unmap		= gart_iommu_unmap,
 	.iova_to_phys	= gart_iommu_iova_to_phys,
 	.pgsize_bitmap	= GART_IOMMU_PGSIZES,
+	.of_xlate	= gart_iommu_of_xlate,
 };
 
 static int tegra_gart_suspend(struct device *dev)
@@ -438,6 +449,7 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	}
 
 	iommu_device_set_ops(&gart->iommu, &gart_iommu_ops);
+	iommu_device_set_fwnode(&gart->iommu, dev->fwnode);
 
 	ret = iommu_device_register(&gart->iommu);
 	if (ret) {
-- 
2.19.0