linux-kernel - [PATCH v2 3/3] iommu/tegra-smmu: Add PCI support

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Date:   Tue, 29 Sep 2020 17:30:13 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     thierry.reding@...il.com, joro@...tes.org, krzk@...nel.org,
        digetx@...il.com
Cc:     vdumpa@...dia.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] iommu/tegra-smmu: Add PCI support

This patch simply adds support for PCI devices. Also reverses
bus_set_iommu in tegra_smmu_remove().

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---

Changelog
v1->v2
 * Added error-out labels in tegra_smmu_probe()
 * Dropped pci_request_acs() since IOMMU core would call it.

 drivers/iommu/tegra-smmu.c | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index cf4981369828..74d84908679e 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -856,6 +857,7 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
 	const struct tegra_smmu_group_soc *soc;
 	unsigned int swgroup = fwspec->ids[0];
 	struct tegra_smmu_group *group;
+	bool pci = dev_is_pci(dev);
 	struct iommu_group *grp;
 
 	/* Find group_soc associating with swgroup */
@@ -882,7 +884,7 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
 	group->smmu = smmu;
 	group->soc = soc;
 
-	group->group = iommu_group_alloc();
+	group->group = pci ? pci_device_group(dev) : iommu_group_alloc();
 	if (IS_ERR(group->group)) {
 		devm_kfree(smmu->dev, group);
 		mutex_unlock(&smmu->lock);
@@ -1079,26 +1081,39 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 	iommu_device_set_fwnode(&smmu->iommu, dev->fwnode);
 
 	err = iommu_device_register(&smmu->iommu);
-	if (err) {
-		iommu_device_sysfs_remove(&smmu->iommu);
-		return ERR_PTR(err);
-	}
+	if (err)
+		goto err_sysfs;
 
 	err = bus_set_iommu(&platform_bus_type, &tegra_smmu_ops);
-	if (err < 0) {
-		iommu_device_unregister(&smmu->iommu);
-		iommu_device_sysfs_remove(&smmu->iommu);
-		return ERR_PTR(err);
+	if (err < 0)
+		goto err_unregister;
+
+#ifdef CONFIG_PCI
+	if (!iommu_present(&pci_bus_type)) {
+		err = bus_set_iommu(&pci_bus_type, &tegra_smmu_ops);
+		if (err < 0)
+			goto err_bus_set;
 	}
+#endif
 
 	if (IS_ENABLED(CONFIG_DEBUG_FS))
 		tegra_smmu_debugfs_init(smmu);
 
 	return smmu;
+
+err_bus_set:
+	bus_set_iommu(&platform_bus_type, NULL);
+err_unregister:
+	iommu_device_unregister(&smmu->iommu);
+err_sysfs:
+	iommu_device_sysfs_remove(&smmu->iommu);
+
+	return ERR_PTR(err);
 }
 
 void tegra_smmu_remove(struct tegra_smmu *smmu)
 {
+	bus_set_iommu(&platform_bus_type, NULL);
 	iommu_device_unregister(&smmu->iommu);
 	iommu_device_sysfs_remove(&smmu->iommu);
 
-- 
2.17.1