For mdev device, create new sysfs attribute "instances" to show
number of instances allocated for possible aggregation type.
For compatibility default or without aggregated allocation, the
number is 1.
Cc: Kirti Wankhede <kwankhede@xxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
---
drivers/vfio/mdev/mdev_core.c | 1 +
drivers/vfio/mdev/mdev_private.h | 1 +
drivers/vfio/mdev/mdev_sysfs.c | 8 ++++++++
3 files changed, 10 insertions(+)
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index e69db302a4f2..f0478fc372d8 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -326,6 +326,7 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid,
mdev->dev.bus = &mdev_bus_type;
mdev->dev.release = mdev_device_release;
dev_set_name(&mdev->dev, "%pUl", uuid.b);
+ mdev->type_instances = instances;
ret = device_register(&mdev->dev);
if (ret) {
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index c9d3fe04e273..aa0b4b64c503 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -33,6 +33,7 @@ struct mdev_device {
struct kref ref;
struct list_head next;
struct kobject *type_kobj;
+ unsigned int type_instances;
bool active;
};
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index a06e5b7c69d3..5a417a20e774 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -268,10 +268,18 @@ static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
return count;
}
+static ssize_t instances_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+ return sprintf(buf, "%u\n", mdev->type_instances);
+}
+
static DEVICE_ATTR_WO(remove);
+static DEVICE_ATTR_RO(instances);
static const struct attribute *mdev_device_attrs[] = {
&dev_attr_remove.attr,
+ &dev_attr_instances.attr,
NULL,
};
--
2.18.0
