For supported mdev driver to create aggregated device, this creates
new "aggregation" attribute for target type, which will show maximum
number of instance resources that can be aggregated.
Cc: Kirti Wankhede <kwankhede@xxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Cornelia Huck <cohuck@xxxxxxxxxx>
Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
---
drivers/vfio/mdev/mdev_core.c | 19 +++++++++++++++++++
drivers/vfio/mdev/mdev_private.h | 2 ++
drivers/vfio/mdev/mdev_sysfs.c | 22 ++++++++++++++++++++++
include/linux/mdev.h | 8 ++++++++
4 files changed, 51 insertions(+)
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 545c52ec7618..8f8bbb72e5d9 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -161,6 +161,25 @@ static int mdev_device_remove_cb(struct device *dev, void *data)
return mdev_device_remove(dev, data ? *(bool *)data : true);
}
+int mdev_max_aggregated_instances(struct kobject *kobj, struct device *dev,
+ unsigned int *m)
+{
+ struct mdev_parent *parent;
+ struct mdev_type *type = to_mdev_type(kobj);
+ int ret;
+
+ parent = mdev_get_parent(type->parent);
+ if (!parent)
+ return -EINVAL;
+
+ if (parent->ops->max_aggregated_instances) {
+ ret = parent->ops->max_aggregated_instances(kobj, dev, m);
+ } else
+ ret = -EINVAL;
+ mdev_put_parent(parent);
+ return ret;
+}
+
/*
* mdev_register_device : Register a device
* @dev: device structure representing parent device.
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index e90d295d3927..f1289db75884 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -63,4 +63,6 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid,
unsigned int instances);
int mdev_device_remove(struct device *dev, bool force_remove);
+int mdev_max_aggregated_instances(struct kobject *kobj, struct device *dev,
+ unsigned int *m);
#endif /* MDEV_PRIVATE_H */
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index aefed0c8891b..a329d6ab6cb9 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -103,6 +103,18 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
MDEV_TYPE_ATTR_WO(create);
+static ssize_t
+aggregation_show(struct kobject *kobj, struct device *dev, char *buf)
+{
+ unsigned int m;
+
+ if (mdev_max_aggregated_instances(kobj, dev, &m))
+ return sprintf(buf, "1\n");
+ else
+ return sprintf(buf, "%u\n", m);
+}
+MDEV_TYPE_ATTR_RO(aggregation);
+
static void mdev_type_release(struct kobject *kobj)
{
struct mdev_type *type = to_mdev_type(kobj);
@@ -145,6 +157,14 @@ struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
if (ret)
goto attr_create_failed;
+ if (parent->ops->create_with_instances &&
+ parent->ops->max_aggregated_instances) {
+ ret = sysfs_create_file(&type->kobj,
+ &mdev_type_attr_aggregation.attr);
+ if (ret)
+ goto attr_aggregate_failed;
+ }
+
type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
if (!type->devices_kobj) {
ret = -ENOMEM;
@@ -165,6 +185,8 @@ struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
attrs_failed:
kobject_put(type->devices_kobj);
attr_devices_failed:
+ sysfs_remove_file(&type->kobj, &mdev_type_attr_aggregation.attr);
+attr_aggregate_failed:
sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
attr_create_failed:
kobject_del(&type->kobj);
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index c12c0bfc5598..66cfdb0bf0d6 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -39,6 +39,11 @@ struct mdev_device;
* that is being created
* @instances: number of instances to aggregate
* Returns integer: success (0) or error (< 0)
+ * @max_aggregated_instances: Return max number for aggregated resources
+ * @kobj: kobject of type
+ * @dev: mdev parent device for target type
+ * @max: return max number of instances which can aggregate
+ * Returns integer: success (0) or error (< 0)
* @remove: Called to free resources in parent device's driver for a
* a mediated device. It is mandatory to provide 'remove'
* ops.
@@ -82,6 +87,9 @@ struct mdev_parent_ops {
int (*create_with_instances)(struct kobject *kobj,
struct mdev_device *mdev,
unsigned int instances);
+ int (*max_aggregated_instances)(struct kobject *kobj,
+ struct device *dev,
+ unsigned int *max);
int (*remove)(struct mdev_device *mdev);
int (*open)(struct mdev_device *mdev);
void (*release)(struct mdev_device *mdev);
--
2.19.1
