linux-kernel - [PATCH 4/5] iommu/tegra-smmu: Add PCI support

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Date:   Sat, 26 Sep 2020 01:07:18 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     thierry.reding@...il.com, joro@...tes.org, krzk@...nel.org
Cc:     vdumpa@...dia.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] iommu/tegra-smmu: Add PCI support

This patch simply adds support for PCI devices.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
 drivers/iommu/tegra-smmu.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 97a7185b4578..9dbc5d7183cc 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -15,6 +15,7 @@
 #include <linux/spinlock.h>
 #include <linux/dma-iommu.h>
 #include <linux/dma-mapping.h>
+#include <linux/pci.h>
 
 #include <soc/tegra/ahb.h>
 #include <soc/tegra/mc.h>
@@ -935,6 +936,7 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
 	const struct tegra_smmu_group_soc *soc;
 	struct tegra_smmu_group *group;
 	int swgroup = fwspec->ids[0];
+	bool pci = dev_is_pci(dev);
 	struct iommu_group *grp;
 
 	/* Find group_soc associating with swgroup */
@@ -961,7 +963,7 @@ 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);
@@ -1180,6 +1182,19 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 		return ERR_PTR(err);
 	}
 
+#ifdef CONFIG_PCI
+	if (!iommu_present(&pci_bus_type)) {
+		pci_request_acs();
+		err = bus_set_iommu(&pci_bus_type, &tegra_smmu_ops);
+		if (err < 0) {
+			bus_set_iommu(&platform_bus_type, NULL);
+			iommu_device_unregister(&smmu->iommu);
+			iommu_device_sysfs_remove(&smmu->iommu);
+			return ERR_PTR(err);
+		}
+	}
+#endif
+
 	if (IS_ENABLED(CONFIG_DEBUG_FS))
 		tegra_smmu_debugfs_init(smmu);
 
-- 
2.17.1