For special mdev type which can aggregate instances for mdev device,
this extends mdev create interface by allowing extra "instances=xxx"
parameter, which is passed to mdev device model to be able to create
arbitrary bundled number of instances for target mdev device.
v2: create new create_with_instances operator for vendor driver
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 | 18 +++++++++++++----
drivers/vfio/mdev/mdev_private.h | 5 ++++-
drivers/vfio/mdev/mdev_sysfs.c | 34 ++++++++++++++++++++++++++------
include/linux/mdev.h | 10 ++++++++++
4 files changed, 56 insertions(+), 11 deletions(-)
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 0212f0ee8aea..e69db302a4f2 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -104,12 +104,16 @@ static inline void mdev_put_parent(struct mdev_parent *parent)
}
static int mdev_device_create_ops(struct kobject *kobj,
- struct mdev_device *mdev)
+ struct mdev_device *mdev,
+ unsigned int instances)
{
struct mdev_parent *parent = mdev->parent;
int ret;
- ret = parent->ops->create(kobj, mdev);
+ if (instances > 1)
+ ret = parent->ops->create_with_instances(kobj, mdev, instances);
+ else
+ ret = parent->ops->create(kobj, mdev);
if (ret)
return ret;
@@ -276,7 +280,8 @@ static void mdev_device_release(struct device *dev)
kfree(mdev);
}
-int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
+int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid,
+ unsigned int instances)
{
int ret;
struct mdev_device *mdev, *tmp;
@@ -287,6 +292,11 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
if (!parent)
return -EINVAL;
+ if (instances > 1 && !parent->ops->create_with_instances) {
+ ret = -EINVAL;
+ goto mdev_fail;
+ }
+
mutex_lock(&mdev_list_lock);
/* Check for duplicate */
@@ -323,7 +333,7 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
goto mdev_fail;
}
- ret = mdev_device_create_ops(kobj, mdev);
+ ret = mdev_device_create_ops(kobj, mdev, instances);
if (ret)
goto create_fail;
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index b5819b7d7ef7..c9d3fe04e273 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -52,13 +52,16 @@ struct mdev_type {
#define to_mdev_type(_kobj) \
container_of(_kobj, struct mdev_type, kobj)
+#define MDEV_CREATE_OPT_LEN 32
+
int parent_create_sysfs_files(struct mdev_parent *parent);
void parent_remove_sysfs_files(struct mdev_parent *parent);
int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type);
void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type);
-int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid);
+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);
#endif /* MDEV_PRIVATE_H */
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 249472f05509..a06e5b7c69d3 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -54,11 +54,15 @@ static const struct sysfs_ops mdev_type_sysfs_ops = {
static ssize_t create_store(struct kobject *kobj, struct device *dev,
const char *buf, size_t count)
{
- char *str;
+ char *str, *opt = NULL;
uuid_le uuid;
int ret;
+ unsigned int instances = 1;
- if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
+ if (count < UUID_STRING_LEN)
+ return -EINVAL;
+
+ if (count > UUID_STRING_LEN + 1 + MDEV_CREATE_OPT_LEN)
return -EINVAL;
str = kstrndup(buf, count, GFP_KERNEL);
@@ -66,13 +70,31 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
return -ENOMEM;
ret = uuid_le_to_bin(str, &uuid);
- kfree(str);
- if (ret)
+ if (ret) {
+ kfree(str);
return ret;
+ }
- ret = mdev_device_create(kobj, dev, uuid);
- if (ret)
+ if (count > UUID_STRING_LEN + 1) {
+ opt = str + UUID_STRING_LEN;
+ if (*opt++ != ',' ||
+ strncmp(opt, "instances=", 10)) {
+ kfree(str);
+ return -EINVAL;
+ }
+ opt += 10;
+ if (kstrtouint(opt, 10, &instances)) {
+ kfree(str);
+ return -EINVAL;
+ }
+ }
+
+ ret = mdev_device_create(kobj, dev, uuid, instances);
+ if (ret) {
+ kfree(str);
return ret;
+ }
+ kfree(str);
return count;
}
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index b6e048e1045f..cfb702600f95 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -30,6 +30,13 @@ struct mdev_device;
* @kobj: kobject of type for which 'create' is called.
* @mdev: mdev_device structure on of mediated device
* that is being created
+ * @create_with_instances: Allocate aggregated instances' resources in parent device's
+ * driver for a particular mediated device. It is optional
+ * if doesn't support aggregated resources.
+ * @kobj: kobject of type for which 'create' is called.
+ * @mdev: mdev_device structure on of mediated device
+ * that is being created
+ * @instances: number of instances to 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'
@@ -71,6 +78,9 @@ struct mdev_parent_ops {
struct attribute_group **supported_type_groups;
int (*create)(struct kobject *kobj, struct mdev_device *mdev);
+ int (*create_with_instances)(struct kobject *kobj,
+ struct mdev_device *mdev,
+ unsigned int instances);
int (*remove)(struct mdev_device *mdev);
int (*open)(struct mdev_device *mdev);
void (*release)(struct mdev_device *mdev);
--
2.18.0
