diff options
Diffstat (limited to 'include/linux/mdev.h')
| -rw-r--r-- | include/linux/mdev.h | 165 |
1 files changed, 53 insertions, 112 deletions
diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 0ce30ca78db0..139d05b26f82 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -10,139 +10,80 @@ #ifndef MDEV_H #define MDEV_H -struct mdev_device; +#include <linux/device.h> +#include <linux/uuid.h> -/* - * Called by the parent device driver to set the device which represents - * this mdev in iommu protection scope. By default, the iommu device is - * NULL, that indicates using vendor defined isolation. - * - * @dev: the mediated device that iommu will isolate. - * @iommu_device: a pci device which represents the iommu for @dev. - * - * Return 0 for success, otherwise negative error value. - */ -int mdev_set_iommu_device(struct device *dev, struct device *iommu_device); +struct mdev_type; -struct device *mdev_get_iommu_device(struct device *dev); +struct mdev_device { + struct device dev; + guid_t uuid; + struct list_head next; + struct mdev_type *type; + bool active; +}; -/** - * struct mdev_parent_ops - Structure to be registered for each parent device to - * register the device to mdev module. - * - * @owner: The module owner. - * @dev_attr_groups: Attributes of the parent device. - * @mdev_attr_groups: Attributes of the mediated device. - * @supported_type_groups: Attributes to define supported types. It is mandatory - * to provide supported types. - * @create: Called to allocate basic resources in parent device's - * driver for a particular mediated device. It is - * mandatory to provide create ops. - * @kobj: kobject of type for which 'create' is called. - * @mdev: mdev_device structure on of mediated device - * that is being created - * 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. - * @mdev: mdev_device device structure which is being - * destroyed - * Returns integer: success (0) or error (< 0) - * @open: Open mediated device. - * @mdev: mediated device. - * Returns integer: success (0) or error (< 0) - * @release: release mediated device - * @mdev: mediated device. - * @read: Read emulation callback - * @mdev: mediated device structure - * @buf: read buffer - * @count: number of bytes to read - * @ppos: address. - * Retuns number on bytes read on success or error. - * @write: Write emulation callback - * @mdev: mediated device structure - * @buf: write buffer - * @count: number of bytes to be written - * @ppos: address. - * Retuns number on bytes written on success or error. - * @ioctl: IOCTL callback - * @mdev: mediated device structure - * @cmd: ioctl command - * @arg: arguments to ioctl - * @mmap: mmap callback - * @mdev: mediated device structure - * @vma: vma structure - * Parent device that support mediated device should be registered with mdev - * module with mdev_parent_ops structure. - **/ -struct mdev_parent_ops { - struct module *owner; - const struct attribute_group **dev_attr_groups; - const struct attribute_group **mdev_attr_groups; - struct attribute_group **supported_type_groups; +struct mdev_type { + /* set by the driver before calling mdev_register parent: */ + const char *sysfs_name; + const char *pretty_name; + + /* set by the core, can be used drivers */ + struct mdev_parent *parent; - int (*create)(struct kobject *kobj, struct mdev_device *mdev); - int (*remove)(struct mdev_device *mdev); - int (*open)(struct mdev_device *mdev); - void (*release)(struct mdev_device *mdev); - ssize_t (*read)(struct mdev_device *mdev, char __user *buf, - size_t count, loff_t *ppos); - ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, - size_t count, loff_t *ppos); - long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, - unsigned long arg); - int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); + /* internal only */ + struct kobject kobj; + struct kobject *devices_kobj; }; -/* interface for exporting mdev supported type attributes */ -struct mdev_type_attribute { - struct attribute attr; - ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf); - ssize_t (*store)(struct kobject *kobj, struct device *dev, - const char *buf, size_t count); +/* embedded into the struct device that the mdev devices hang off */ +struct mdev_parent { + struct device *dev; + struct mdev_driver *mdev_driver; + struct kset *mdev_types_kset; + /* Synchronize device creation/removal with parent unregistration */ + struct rw_semaphore unreg_sem; + struct mdev_type **types; + unsigned int nr_types; + atomic_t available_instances; }; -#define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \ -struct mdev_type_attribute mdev_type_attr_##_name = \ - __ATTR(_name, _mode, _show, _store) -#define MDEV_TYPE_ATTR_RW(_name) \ - struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name) -#define MDEV_TYPE_ATTR_RO(_name) \ - struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name) -#define MDEV_TYPE_ATTR_WO(_name) \ - struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name) +static inline struct mdev_device *to_mdev_device(struct device *dev) +{ + return container_of(dev, struct mdev_device, dev); +} /** * struct mdev_driver - Mediated device driver - * @name: driver name + * @device_api: string to return for the device_api sysfs + * @max_instances: maximum number of instances supported (optional) * @probe: called when new device created * @remove: called when device removed + * @get_available: Return the max number of instances that can be created + * @show_description: Print a description of the mtype * @driver: device driver structure - * **/ struct mdev_driver { - const char *name; - int (*probe)(struct device *dev); - void (*remove)(struct device *dev); + const char *device_api; + unsigned int max_instances; + int (*probe)(struct mdev_device *dev); + void (*remove)(struct mdev_device *dev); + unsigned int (*get_available)(struct mdev_type *mtype); + ssize_t (*show_description)(struct mdev_type *mtype, char *buf); struct device_driver driver; }; -#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver) - -void *mdev_get_drvdata(struct mdev_device *mdev); -void mdev_set_drvdata(struct mdev_device *mdev, void *data); -const guid_t *mdev_uuid(struct mdev_device *mdev); - -extern struct bus_type mdev_bus_type; - -int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops); -void mdev_unregister_device(struct device *dev); +int mdev_register_parent(struct mdev_parent *parent, struct device *dev, + struct mdev_driver *mdev_driver, struct mdev_type **types, + unsigned int nr_types); +void mdev_unregister_parent(struct mdev_parent *parent); -int mdev_register_driver(struct mdev_driver *drv, struct module *owner); +int mdev_register_driver(struct mdev_driver *drv); void mdev_unregister_driver(struct mdev_driver *drv); -struct device *mdev_parent_dev(struct mdev_device *mdev); -struct device *mdev_dev(struct mdev_device *mdev); -struct mdev_device *mdev_from_dev(struct device *dev); +static inline struct device *mdev_dev(struct mdev_device *mdev) +{ + return &mdev->dev; +} #endif /* MDEV_H */ |