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Subject[PATCH v3 6/7] iommu/omap: Add iommu-group support
Date
From: Joerg Roedel <jroedel@suse.de>

Support for IOMMU groups will become mandatory for drivers,
so add it to the omap iommu driver.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
[s-anna@ti.com: minor error cleanups]
Signed-off-by: Suman Anna <s-anna@ti.com>
---
v3 w.r.t v1:
- iommu_group_get_for_dev() failure path cleanup code added in
the add_device callback
- iommu_group_alloc() added in the same place relative to iommu_device
calls, but before pm_runtime calls
- iommu_device_register() failure cleanup dropped since it is handled
in patch 5
- omap_device_group() renamed to omap_iommu_device_group() following
the convention on all OMAP IOMMU ops

drivers/iommu/omap-iommu.c | 39 ++++++++++++++++++++++++++++++++++++++-
drivers/iommu/omap-iommu.h | 1 +
2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index ef44fc740da7..95dfca36ccb9 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -943,9 +943,13 @@ static int omap_iommu_probe(struct platform_device *pdev)
return err;
platform_set_drvdata(pdev, obj);

+ obj->group = iommu_group_alloc();
+ if (IS_ERR(obj->group))
+ return PTR_ERR(obj->group);
+
err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL, obj->name);
if (err)
- return err;
+ goto out_group;

iommu_device_set_ops(&obj->iommu, &omap_iommu_ops);

@@ -959,10 +963,13 @@ static int omap_iommu_probe(struct platform_device *pdev)
omap_iommu_debugfs_add(obj);

dev_info(&pdev->dev, "%s registered\n", obj->name);
+
return 0;

out_sysfs:
iommu_device_sysfs_remove(&obj->iommu);
+out_group:
+ iommu_group_put(obj->group);
return err;
}

@@ -970,6 +977,9 @@ static int omap_iommu_remove(struct platform_device *pdev)
{
struct omap_iommu *obj = platform_get_drvdata(pdev);

+ iommu_group_put(obj->group);
+ obj->group = NULL;
+
iommu_device_sysfs_remove(&obj->iommu);
iommu_device_unregister(&obj->iommu);

@@ -1217,6 +1227,7 @@ static int omap_iommu_add_device(struct device *dev)
{
struct omap_iommu_arch_data *arch_data;
struct omap_iommu *oiommu;
+ struct iommu_group *group;
struct device_node *np;
struct platform_device *pdev;
int ret;
@@ -1262,6 +1273,19 @@ static int omap_iommu_add_device(struct device *dev)
arch_data->iommu_dev = oiommu;
dev->archdata.iommu = arch_data;

+ /*
+ * IOMMU group initialization calls into omap_iommu_device_group, which
+ * needs a valid dev->archdata.iommu pointer
+ */
+ group = iommu_group_get_for_dev(dev);
+ if (IS_ERR(group)) {
+ iommu_device_unlink(&oiommu->iommu, dev);
+ dev->archdata.iommu = NULL;
+ kfree(arch_data);
+ return PTR_ERR(group);
+ }
+ iommu_group_put(group);
+
of_node_put(np);

return 0;
@@ -1275,12 +1299,24 @@ static void omap_iommu_remove_device(struct device *dev)
return;

iommu_device_unlink(&arch_data->iommu_dev->iommu, dev);
+ iommu_group_remove_device(dev);

dev->archdata.iommu = NULL;
kfree(arch_data);

}

+static struct iommu_group *omap_iommu_device_group(struct device *dev)
+{
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ struct iommu_group *group = NULL;
+
+ if (arch_data->iommu_dev)
+ group = arch_data->iommu_dev->group;
+
+ return group;
+}
+
static const struct iommu_ops omap_iommu_ops = {
.domain_alloc = omap_iommu_domain_alloc,
.domain_free = omap_iommu_domain_free,
@@ -1292,6 +1328,7 @@ static const struct iommu_ops omap_iommu_ops = {
.iova_to_phys = omap_iommu_iova_to_phys,
.add_device = omap_iommu_add_device,
.remove_device = omap_iommu_remove_device,
+ .device_group = omap_iommu_device_group,
.pgsize_bitmap = OMAP_IOMMU_PGSIZES,
};

diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
index 758958a4712c..6e70515e6038 100644
--- a/drivers/iommu/omap-iommu.h
+++ b/drivers/iommu/omap-iommu.h
@@ -70,6 +70,7 @@ struct omap_iommu {
u32 id;

struct iommu_device iommu;
+ struct iommu_group *group;
};

/**
--
2.12.0
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