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Subject[RFC PATCH 31/34] iommu/exynos: Create iommu_device in struct exynos_iommu_owner
Date
From: Joerg Roedel <jroedel@suse.de>

The 'struct exynos_iommu_owner' is an umbrella for multiple SYSMMU
instances attached to one master. As such all these instances are
handled the same, they are all configured with the same iommu_domain,
for example.

The IOMMU core code expects each device to have only one IOMMU
attached, so create the IOMMU-device for the umbrella instead of each
hardware SYSMMU.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/exynos-iommu.c | 96 +++++++++++++++++++++++++++---------
1 file changed, 73 insertions(+), 23 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 186ff5cc975c..86ecccbf0438 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -235,6 +235,8 @@ struct exynos_iommu_owner {
struct list_head controllers; /* list of sysmmu_drvdata.owner_node */
struct iommu_domain *domain; /* domain this device is attached */
struct mutex rpm_lock; /* for runtime pm of all sysmmus */
+
+ struct iommu_device iommu; /* IOMMU core handle */
};

/*
@@ -274,8 +276,6 @@ struct sysmmu_drvdata {
struct list_head owner_node; /* node for owner controllers list */
phys_addr_t pgtable; /* assigned page table structure */
unsigned int version; /* our version */
-
- struct iommu_device iommu; /* IOMMU core handle */
};

static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom)
@@ -625,18 +625,6 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
data->sysmmu = dev;
spin_lock_init(&data->lock);

- ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
- dev_name(data->sysmmu));
- if (ret)
- return ret;
-
- iommu_device_set_ops(&data->iommu, &exynos_iommu_ops);
- iommu_device_set_fwnode(&data->iommu, &dev->of_node->fwnode);
-
- ret = iommu_device_register(&data->iommu);
- if (ret)
- return ret;
-
platform_set_drvdata(pdev, data);

__sysmmu_get_version(data);
@@ -1261,6 +1249,8 @@ static int exynos_iommu_add_device(struct device *dev)
}
iommu_group_put(group);

+ iommu_device_link(&owner->iommu, dev);
+
return 0;
}

@@ -1282,18 +1272,82 @@ static void exynos_iommu_remove_device(struct device *dev)
iommu_group_put(group);
}
}
+ iommu_device_unlink(&owner->iommu, dev);
iommu_group_remove_device(dev);

list_for_each_entry(data, &owner->controllers, owner_node)
device_link_del(data->link);
}

+static int exynos_iommu_device_init(struct exynos_iommu_owner *owner)
+{
+ static u32 counter = 0;
+ int ret;
+
+ /*
+ * Create a virtual IOMMU device. In reality it is an umbrella for a
+ * number of SYSMMU platform devices, but that also means that any
+ * master can have more than one real IOMMU device. This drivers handles
+ * all the real devices for one master synchronously, so they appear as
+ * one anyway.
+ */
+ ret = iommu_device_sysfs_add(&owner->iommu, NULL, NULL,
+ "sysmmu-owner-%d", counter++);
+ if (ret)
+ return ret;
+
+ iommu_device_set_ops(&owner->iommu, &exynos_iommu_ops);
+
+ return 0;
+}
+
+static void exynos_iommu_device_remove(struct exynos_iommu_owner *owner)
+{
+ iommu_device_set_ops(&owner->iommu, NULL);
+ iommu_device_sysfs_remove(&owner->iommu);
+}
+
+static int exynos_owner_init(struct device *dev)
+{
+ struct exynos_iommu_owner *owner = dev->archdata.iommu;
+ int ret;
+
+ if (owner)
+ return 0;
+
+ owner = kzalloc(sizeof(*owner), GFP_KERNEL);
+ if (!owner)
+ return -ENOMEM;
+
+ ret = exynos_iommu_device_init(owner);
+ if (ret)
+ goto out_free_owner;
+
+ ret = iommu_device_register(&owner->iommu);
+ if (ret)
+ goto out_remove_iommu_device;
+
+ INIT_LIST_HEAD(&owner->controllers);
+ mutex_init(&owner->rpm_lock);
+ dev->archdata.iommu = owner;
+
+ return 0;
+
+out_remove_iommu_device:
+ exynos_iommu_device_remove(owner);
+out_free_owner:
+ kfree(owner);
+
+ return ret;
+}
+
static int exynos_iommu_of_xlate(struct device *dev,
struct of_phandle_args *spec)
{
- struct exynos_iommu_owner *owner = dev->archdata.iommu;
struct platform_device *sysmmu = of_find_device_by_node(spec->np);
struct sysmmu_drvdata *data, *entry;
+ struct exynos_iommu_owner *owner;
+ int ret;

if (!sysmmu)
return -ENODEV;
@@ -1302,15 +1356,11 @@ static int exynos_iommu_of_xlate(struct device *dev,
if (!data)
return -ENODEV;

- if (!owner) {
- owner = kzalloc(sizeof(*owner), GFP_KERNEL);
- if (!owner)
- return -ENOMEM;
+ ret = exynos_owner_init(dev);
+ if (ret)
+ return ret;

- INIT_LIST_HEAD(&owner->controllers);
- mutex_init(&owner->rpm_lock);
- dev->archdata.iommu = owner;
- }
+ owner = dev->archdata.iommu;

list_for_each_entry(entry, &owner->controllers, owner_node)
if (entry == data)
--
2.17.1
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