[libvirt] [PATCH v3 3/6] vfio/mdev: Add "aggregated_instances" attribute for supported mdev device

For mdev device created by "aggregate" parameter, this creates new mdev device attribute "aggregated_instances" to show number of aggregated instances allocated. v2: - change attribute name as "aggregated_instances" v3: - create only for aggregated allocation Cc: Kirti Wankhede <kwankhede(a)nvidia.com&gt; Cc: Alex Williamson <alex.williamson(a)redhat.com&gt; Cc: Kevin Tian <kevin.tian(a)intel.com&gt; Cc: Cornelia Huck <cohuck(a)redhat.com&gt; Signed-off-by: Zhenyu Wang <zhenyuw(a)linux.intel.com&gt; --- drivers/vfio/mdev/mdev_sysfs.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c index a329d6ab6cb9..f03bdfbf5a42 100644 --- a/drivers/vfio/mdev/mdev_sysfs.c +++ b/drivers/vfio/mdev/mdev_sysfs.c @@ -292,7 +292,17 @@ static ssize_t remove_store(struct device *dev, struct device_attribute *attr, return count; } +static ssize_t +aggregated_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(aggregated_instances); static const struct attribute *mdev_device_attrs[] = { &dev_attr_remove.attr, @@ -301,6 +311,7 @@ static const struct attribute *mdev_device_attrs[] = { int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type) { + struct mdev_device *mdev = to_mdev_device(dev); int ret; ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev)); @@ -315,8 +326,17 @@ int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type) if (ret) goto create_files_failed; + if (mdev->type_instances > 1) { + ret = sysfs_create_file(&dev->kobj, + &dev_attr_aggregated_instances.attr); + if (ret) + goto create_aggregated_failed; + } + return ret; +create_aggregated_failed: + sysfs_remove_files(&dev->kobj, mdev_device_attrs); create_files_failed: sysfs_remove_link(&dev->kobj, "mdev_type"); type_link_failed: -- 2.19.1