| /* SPDX-License-Identifier: GPL-2.0 */ | |
| #ifndef _LINUX_VDPA_H | |
| #define _LINUX_VDPA_H | |
| #include <linux/kernel.h> | |
| #include <linux/device.h> | |
| #include <linux/interrupt.h> | |
| #include <linux/virtio.h> | |
| #include <linux/vhost_iotlb.h> | |
| #include <linux/virtio_net.h> | |
| #include <linux/virtio_blk.h> | |
| #include <linux/if_ether.h> | |
| /** | |
| * struct vdpa_callback - vDPA callback definition. | |
| * @callback: interrupt callback function | |
| * @private: the data passed to the callback function | |
| * @trigger: the eventfd for the callback (Optional). | |
| * When it is set, the vDPA driver must guarantee that | |
| * signaling it is functional equivalent to triggering | |
| * the callback. Then vDPA parent can signal it directly | |
| * instead of triggering the callback. | |
| */ | |
| struct vdpa_callback { | |
| irqreturn_t (*callback)(void *data); | |
| void *private; | |
| struct eventfd_ctx *trigger; | |
| }; | |
| /** | |
| * struct vdpa_notification_area - vDPA notification area | |
| * @addr: base address of the notification area | |
| * @size: size of the notification area | |
| */ | |
| struct vdpa_notification_area { | |
| resource_size_t addr; | |
| resource_size_t size; | |
| }; | |
| /** | |
| * struct vdpa_vq_state_split - vDPA split virtqueue state | |
| * @avail_index: available index | |
| */ | |
| struct vdpa_vq_state_split { | |
| u16 avail_index; | |
| }; | |
| /** | |
| * struct vdpa_vq_state_packed - vDPA packed virtqueue state | |
| * @last_avail_counter: last driver ring wrap counter observed by device | |
| * @last_avail_idx: device available index | |
| * @last_used_counter: device ring wrap counter | |
| * @last_used_idx: used index | |
| */ | |
| struct vdpa_vq_state_packed { | |
| u16 last_avail_counter:1; | |
| u16 last_avail_idx:15; | |
| u16 last_used_counter:1; | |
| u16 last_used_idx:15; | |
| }; | |
| struct vdpa_vq_state { | |
| union { | |
| struct vdpa_vq_state_split split; | |
| struct vdpa_vq_state_packed packed; | |
| }; | |
| }; | |
| struct vdpa_mgmt_dev; | |
| /** | |
| * struct vdpa_device - representation of a vDPA device | |
| * @dev: underlying device | |
| * @vmap: the metadata passed to upper layer to be used for mapping | |
| * @config: the configuration ops for this device. | |
| * @map: the map ops for this device | |
| * @cf_lock: Protects get and set access to configuration layout. | |
| * @index: device index | |
| * @features_valid: were features initialized? for legacy guests | |
| * @ngroups: the number of virtqueue groups | |
| * @nas: the number of address spaces | |
| * @use_va: indicate whether virtual address must be used by this device | |
| * @nvqs: maximum number of supported virtqueues | |
| * @mdev: management device pointer; caller must setup when registering device as part | |
| * of dev_add() mgmtdev ops callback before invoking _vdpa_register_device(). | |
| */ | |
| struct vdpa_device { | |
| struct device dev; | |
| union virtio_map vmap; | |
| const struct vdpa_config_ops *config; | |
| const struct virtio_map_ops *map; | |
| struct rw_semaphore cf_lock; /* Protects get/set config */ | |
| unsigned int index; | |
| bool features_valid; | |
| bool use_va; | |
| u32 nvqs; | |
| struct vdpa_mgmt_dev *mdev; | |
| unsigned int ngroups; | |
| unsigned int nas; | |
| }; | |
| /** | |
| * struct vdpa_iova_range - the IOVA range support by the device | |
| * @first: start of the IOVA range | |
| * @last: end of the IOVA range | |
| */ | |
| struct vdpa_iova_range { | |
| u64 first; | |
| u64 last; | |
| }; | |
| struct vdpa_dev_set_config { | |
| u64 device_features; | |
| struct { | |
| u8 mac[ETH_ALEN]; | |
| u16 mtu; | |
| u16 max_vq_pairs; | |
| } net; | |
| u64 mask; | |
| }; | |
| /** | |
| * struct vdpa_map_file - file area for device memory mapping | |
| * @file: vma->vm_file for the mapping | |
| * @offset: mapping offset in the vm_file | |
| */ | |
| struct vdpa_map_file { | |
| struct file *file; | |
| u64 offset; | |
| }; | |
| /** | |
| * struct vdpa_config_ops - operations for configuring a vDPA device. | |
| * Note: vDPA device drivers are required to implement all of the | |
| * operations unless it is mentioned to be optional in the following | |
| * list. | |
| * | |
| * @set_vq_address: Set the address of virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @desc_area: address of desc area | |
| * @driver_area: address of driver area | |
| * @device_area: address of device area | |
| * Returns integer: success (0) or error (< 0) | |
| * @set_vq_num: Set the size of virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @num: the size of virtqueue | |
| * @kick_vq: Kick the virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @kick_vq_with_data: Kick the virtqueue and supply extra data | |
| * (only if VIRTIO_F_NOTIFICATION_DATA is negotiated) | |
| * @vdev: vdpa device | |
| * @data for split virtqueue: | |
| * 16 bits vqn and 16 bits next available index. | |
| * @data for packed virtqueue: | |
| * 16 bits vqn, 15 least significant bits of | |
| * next available index and 1 bit next_wrap. | |
| * @set_vq_cb: Set the interrupt callback function for | |
| * a virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @cb: virtio-vdev interrupt callback structure | |
| * @set_vq_ready: Set ready status for a virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @ready: ready (true) not ready(false) | |
| * @get_vq_ready: Get ready status for a virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns boolean: ready (true) or not (false) | |
| * @set_vq_state: Set the state for a virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @state: pointer to set virtqueue state (last_avail_idx) | |
| * Returns integer: success (0) or error (< 0) | |
| * @get_vq_state: Get the state for a virtqueue | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @state: pointer to returned state (last_avail_idx) | |
| * @get_vendor_vq_stats: Get the vendor statistics of a device. | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @msg: socket buffer holding stats message | |
| * @extack: extack for reporting error messages | |
| * Returns integer: success (0) or error (< 0) | |
| * @get_vq_notification: Get the notification area for a virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns the notification area | |
| * @get_vq_irq: Get the irq number of a virtqueue (optional, | |
| * but must implemented if require vq irq offloading) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns int: irq number of a virtqueue, | |
| * negative number if no irq assigned. | |
| * @get_vq_size: Get the size of a specific virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Return u16: the size of the virtqueue | |
| * @get_vq_align: Get the virtqueue align requirement | |
| * for the device | |
| * @vdev: vdpa device | |
| * Returns virtqueue algin requirement | |
| * @get_vq_group: Get the group id for a specific | |
| * virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns u32: group id for this virtqueue | |
| * @get_vq_desc_group: Get the group id for the descriptor table of | |
| * a specific virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns u32: group id for the descriptor table | |
| * portion of this virtqueue. Could be different | |
| * than the one from @get_vq_group, in which case | |
| * the access to the descriptor table can be | |
| * confined to a separate asid, isolating from | |
| * the virtqueue's buffer address access. | |
| * @get_device_features: Get virtio features supported by the device | |
| * @vdev: vdpa device | |
| * Returns the virtio features support by the | |
| * device | |
| * @get_backend_features: Get parent-specific backend features (optional) | |
| * Returns the vdpa features supported by the | |
| * device. | |
| * @set_driver_features: Set virtio features supported by the driver | |
| * @vdev: vdpa device | |
| * @features: feature support by the driver | |
| * Returns integer: success (0) or error (< 0) | |
| * @get_driver_features: Get the virtio driver features in action | |
| * @vdev: vdpa device | |
| * Returns the virtio features accepted | |
| * @set_config_cb: Set the config interrupt callback | |
| * @vdev: vdpa device | |
| * @cb: virtio-vdev interrupt callback structure | |
| * @get_vq_num_max: Get the max size of virtqueue | |
| * @vdev: vdpa device | |
| * Returns u16: max size of virtqueue | |
| * @get_vq_num_min: Get the min size of virtqueue (optional) | |
| * @vdev: vdpa device | |
| * Returns u16: min size of virtqueue | |
| * @get_device_id: Get virtio device id | |
| * @vdev: vdpa device | |
| * Returns u32: virtio device id | |
| * @get_vendor_id: Get id for the vendor that provides this device | |
| * @vdev: vdpa device | |
| * Returns u32: virtio vendor id | |
| * @get_status: Get the device status | |
| * @vdev: vdpa device | |
| * Returns u8: virtio device status | |
| * @set_status: Set the device status | |
| * @vdev: vdpa device | |
| * @status: virtio device status | |
| * @reset: Reset device | |
| * @vdev: vdpa device | |
| * Returns integer: success (0) or error (< 0) | |
| * @compat_reset: Reset device with compatibility quirks to | |
| * accommodate older userspace. Only needed by | |
| * parent driver which used to have bogus reset | |
| * behaviour, and has to maintain such behaviour | |
| * for compatibility with older userspace. | |
| * Historically compliant driver only has to | |
| * implement .reset, Historically non-compliant | |
| * driver should implement both. | |
| * @vdev: vdpa device | |
| * @flags: compatibility quirks for reset | |
| * Returns integer: success (0) or error (< 0) | |
| * @suspend: Suspend the device (optional) | |
| * @vdev: vdpa device | |
| * Returns integer: success (0) or error (< 0) | |
| * @resume: Resume the device (optional) | |
| * @vdev: vdpa device | |
| * Returns integer: success (0) or error (< 0) | |
| * @get_config_size: Get the size of the configuration space includes | |
| * fields that are conditional on feature bits. | |
| * @vdev: vdpa device | |
| * Returns size_t: configuration size | |
| * @get_config: Read from device specific configuration space | |
| * @vdev: vdpa device | |
| * @offset: offset from the beginning of | |
| * configuration space | |
| * @buf: buffer used to read to | |
| * @len: the length to read from | |
| * configuration space | |
| * @set_config: Write to device specific configuration space | |
| * @vdev: vdpa device | |
| * @offset: offset from the beginning of | |
| * configuration space | |
| * @buf: buffer used to write from | |
| * @len: the length to write to | |
| * configuration space | |
| * @get_generation: Get device config generation (optional) | |
| * @vdev: vdpa device | |
| * Returns u32: device generation | |
| * @get_iova_range: Get supported iova range (optional) | |
| * @vdev: vdpa device | |
| * Returns the iova range supported by | |
| * the device. | |
| * @set_vq_affinity: Set the affinity of virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * @cpu_mask: the affinity mask | |
| * Returns integer: success (0) or error (< 0) | |
| * @get_vq_affinity: Get the affinity of virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns the affinity mask | |
| * @set_group_asid: Set address space identifier for a | |
| * virtqueue group (optional) | |
| * @vdev: vdpa device | |
| * @group: virtqueue group | |
| * @asid: address space id for this group | |
| * Returns integer: success (0) or error (< 0) | |
| * @set_map: Set device memory mapping (optional) | |
| * Needed for device that using device | |
| * specific DMA translation (on-chip IOMMU) | |
| * @vdev: vdpa device | |
| * @asid: address space identifier | |
| * @iotlb: vhost memory mapping to be | |
| * used by the vDPA | |
| * Returns integer: success (0) or error (< 0) | |
| * @dma_map: Map an area of PA to IOVA (optional) | |
| * Needed for device that using device | |
| * specific DMA translation (on-chip IOMMU) | |
| * and preferring incremental map. | |
| * @vdev: vdpa device | |
| * @asid: address space identifier | |
| * @iova: iova to be mapped | |
| * @size: size of the area | |
| * @pa: physical address for the map | |
| * @perm: device access permission (VHOST_MAP_XX) | |
| * Returns integer: success (0) or error (< 0) | |
| * @dma_unmap: Unmap an area of IOVA (optional but | |
| * must be implemented with dma_map) | |
| * Needed for device that using device | |
| * specific DMA translation (on-chip IOMMU) | |
| * and preferring incremental unmap. | |
| * @vdev: vdpa device | |
| * @asid: address space identifier | |
| * @iova: iova to be unmapped | |
| * @size: size of the area | |
| * Returns integer: success (0) or error (< 0) | |
| * @reset_map: Reset device memory mapping to the default | |
| * state (optional) | |
| * Needed for devices that are using device | |
| * specific DMA translation and prefer mapping | |
| * to be decoupled from the virtio life cycle, | |
| * i.e. device .reset op does not reset mapping | |
| * @vdev: vdpa device | |
| * @asid: address space identifier | |
| * Returns integer: success (0) or error (< 0) | |
| * @get_vq_map: Get the map metadata for a specific | |
| * virtqueue (optional) | |
| * @vdev: vdpa device | |
| * @idx: virtqueue index | |
| * Returns map token union error (NULL) | |
| * @bind_mm: Bind the device to a specific address space | |
| * so the vDPA framework can use VA when this | |
| * callback is implemented. (optional) | |
| * @vdev: vdpa device | |
| * @mm: address space to bind | |
| * @unbind_mm: Unbind the device from the address space | |
| * bound using the bind_mm callback. (optional) | |
| * @vdev: vdpa device | |
| * @free: Free resources that belongs to vDPA (optional) | |
| * @vdev: vdpa device | |
| */ | |
| struct vdpa_config_ops { | |
| /* Virtqueue ops */ | |
| int (*set_vq_address)(struct vdpa_device *vdev, | |
| u16 idx, u64 desc_area, u64 driver_area, | |
| u64 device_area); | |
| void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num); | |
| void (*kick_vq)(struct vdpa_device *vdev, u16 idx); | |
| void (*kick_vq_with_data)(struct vdpa_device *vdev, u32 data); | |
| void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx, | |
| struct vdpa_callback *cb); | |
| void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready); | |
| bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx); | |
| int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, | |
| const struct vdpa_vq_state *state); | |
| int (*get_vq_state)(struct vdpa_device *vdev, u16 idx, | |
| struct vdpa_vq_state *state); | |
| int (*get_vendor_vq_stats)(struct vdpa_device *vdev, u16 idx, | |
| struct sk_buff *msg, | |
| struct netlink_ext_ack *extack); | |
| struct vdpa_notification_area | |
| (*get_vq_notification)(struct vdpa_device *vdev, u16 idx); | |
| /* vq irq is not expected to be changed once DRIVER_OK is set */ | |
| int (*get_vq_irq)(struct vdpa_device *vdev, u16 idx); | |
| u16 (*get_vq_size)(struct vdpa_device *vdev, u16 idx); | |
| /* Device ops */ | |
| u32 (*get_vq_align)(struct vdpa_device *vdev); | |
| u32 (*get_vq_group)(struct vdpa_device *vdev, u16 idx); | |
| u32 (*get_vq_desc_group)(struct vdpa_device *vdev, u16 idx); | |
| u64 (*get_device_features)(struct vdpa_device *vdev); | |
| u64 (*get_backend_features)(const struct vdpa_device *vdev); | |
| int (*set_driver_features)(struct vdpa_device *vdev, u64 features); | |
| u64 (*get_driver_features)(struct vdpa_device *vdev); | |
| void (*set_config_cb)(struct vdpa_device *vdev, | |
| struct vdpa_callback *cb); | |
| u16 (*get_vq_num_max)(struct vdpa_device *vdev); | |
| u16 (*get_vq_num_min)(struct vdpa_device *vdev); | |
| u32 (*get_device_id)(struct vdpa_device *vdev); | |
| u32 (*get_vendor_id)(struct vdpa_device *vdev); | |
| u8 (*get_status)(struct vdpa_device *vdev); | |
| void (*set_status)(struct vdpa_device *vdev, u8 status); | |
| int (*reset)(struct vdpa_device *vdev); | |
| int (*compat_reset)(struct vdpa_device *vdev, u32 flags); | |
| #define VDPA_RESET_F_CLEAN_MAP 1 | |
| int (*suspend)(struct vdpa_device *vdev); | |
| int (*resume)(struct vdpa_device *vdev); | |
| size_t (*get_config_size)(struct vdpa_device *vdev); | |
| void (*get_config)(struct vdpa_device *vdev, unsigned int offset, | |
| void *buf, unsigned int len); | |
| void (*set_config)(struct vdpa_device *vdev, unsigned int offset, | |
| const void *buf, unsigned int len); | |
| u32 (*get_generation)(struct vdpa_device *vdev); | |
| struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev); | |
| int (*set_vq_affinity)(struct vdpa_device *vdev, u16 idx, | |
| const struct cpumask *cpu_mask); | |
| const struct cpumask *(*get_vq_affinity)(struct vdpa_device *vdev, | |
| u16 idx); | |
| /* DMA ops */ | |
| int (*set_map)(struct vdpa_device *vdev, unsigned int asid, | |
| struct vhost_iotlb *iotlb); | |
| int (*dma_map)(struct vdpa_device *vdev, unsigned int asid, | |
| u64 iova, u64 size, u64 pa, u32 perm, void *opaque); | |
| int (*dma_unmap)(struct vdpa_device *vdev, unsigned int asid, | |
| u64 iova, u64 size); | |
| int (*reset_map)(struct vdpa_device *vdev, unsigned int asid); | |
| int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group, | |
| unsigned int asid); | |
| union virtio_map (*get_vq_map)(struct vdpa_device *vdev, u16 idx); | |
| int (*bind_mm)(struct vdpa_device *vdev, struct mm_struct *mm); | |
| void (*unbind_mm)(struct vdpa_device *vdev); | |
| /* Free device resources */ | |
| void (*free)(struct vdpa_device *vdev); | |
| }; | |
| struct vdpa_device *__vdpa_alloc_device(struct device *parent, | |
| const struct vdpa_config_ops *config, | |
| const struct virtio_map_ops *map, | |
| unsigned int ngroups, unsigned int nas, | |
| size_t size, const char *name, | |
| bool use_va); | |
| /** | |
| * vdpa_alloc_device - allocate and initilaize a vDPA device | |
| * | |
| * @dev_struct: the type of the parent structure | |
| * @member: the name of struct vdpa_device within the @dev_struct | |
| * @parent: the parent device | |
| * @config: the bus operations that is supported by this device | |
| * @map: the map operations that is supported by this device | |
| * @ngroups: the number of virtqueue groups supported by this device | |
| * @nas: the number of address spaces | |
| * @name: name of the vdpa device | |
| * @use_va: indicate whether virtual address must be used by this device | |
| * | |
| * Return allocated data structure or ERR_PTR upon error | |
| */ | |
| #define vdpa_alloc_device(dev_struct, member, parent, config, map, \ | |
| ngroups, nas, name, use_va) \ | |
| container_of((__vdpa_alloc_device( \ | |
| parent, config, map, ngroups, nas, \ | |
| (sizeof(dev_struct) + \ | |
| BUILD_BUG_ON_ZERO(offsetof( \ | |
| dev_struct, member))), name, use_va)), \ | |
| dev_struct, member) | |
| int vdpa_register_device(struct vdpa_device *vdev, u32 nvqs); | |
| void vdpa_unregister_device(struct vdpa_device *vdev); | |
| int _vdpa_register_device(struct vdpa_device *vdev, u32 nvqs); | |
| void _vdpa_unregister_device(struct vdpa_device *vdev); | |
| /** | |
| * struct vdpa_driver - operations for a vDPA driver | |
| * @driver: underlying device driver | |
| * @probe: the function to call when a device is found. Returns 0 or -errno. | |
| * @remove: the function to call when a device is removed. | |
| */ | |
| struct vdpa_driver { | |
| struct device_driver driver; | |
| int (*probe)(struct vdpa_device *vdev); | |
| void (*remove)(struct vdpa_device *vdev); | |
| }; | |
| #define vdpa_register_driver(drv) \ | |
| __vdpa_register_driver(drv, THIS_MODULE) | |
| int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner); | |
| void vdpa_unregister_driver(struct vdpa_driver *drv); | |
| #define module_vdpa_driver(__vdpa_driver) \ | |
| module_driver(__vdpa_driver, vdpa_register_driver, \ | |
| vdpa_unregister_driver) | |
| static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver) | |
| { | |
| return container_of(driver, struct vdpa_driver, driver); | |
| } | |
| static inline struct vdpa_device *dev_to_vdpa(struct device *_dev) | |
| { | |
| return container_of(_dev, struct vdpa_device, dev); | |
| } | |
| static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev) | |
| { | |
| return dev_get_drvdata(&vdev->dev); | |
| } | |
| static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data) | |
| { | |
| dev_set_drvdata(&vdev->dev, data); | |
| } | |
| static inline union virtio_map vdpa_get_map(struct vdpa_device *vdev) | |
| { | |
| return vdev->vmap; | |
| } | |
| static inline int vdpa_reset(struct vdpa_device *vdev, u32 flags) | |
| { | |
| const struct vdpa_config_ops *ops = vdev->config; | |
| int ret; | |
| down_write(&vdev->cf_lock); | |
| vdev->features_valid = false; | |
| if (ops->compat_reset && flags) | |
| ret = ops->compat_reset(vdev, flags); | |
| else | |
| ret = ops->reset(vdev); | |
| up_write(&vdev->cf_lock); | |
| return ret; | |
| } | |
| static inline int vdpa_set_features_unlocked(struct vdpa_device *vdev, u64 features) | |
| { | |
| const struct vdpa_config_ops *ops = vdev->config; | |
| int ret; | |
| vdev->features_valid = true; | |
| ret = ops->set_driver_features(vdev, features); | |
| return ret; | |
| } | |
| static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) | |
| { | |
| int ret; | |
| down_write(&vdev->cf_lock); | |
| ret = vdpa_set_features_unlocked(vdev, features); | |
| up_write(&vdev->cf_lock); | |
| return ret; | |
| } | |
| void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, | |
| void *buf, unsigned int len); | |
| void vdpa_set_config(struct vdpa_device *dev, unsigned int offset, | |
| const void *buf, unsigned int length); | |
| void vdpa_set_status(struct vdpa_device *vdev, u8 status); | |
| /** | |
| * struct vdpa_mgmtdev_ops - vdpa device ops | |
| * @dev_add: Add a vdpa device using alloc and register | |
| * @mdev: parent device to use for device addition | |
| * @name: name of the new vdpa device | |
| * @config: config attributes to apply to the device under creation | |
| * Driver need to add a new device using _vdpa_register_device() | |
| * after fully initializing the vdpa device. Driver must return 0 | |
| * on success or appropriate error code. | |
| * @dev_del: Remove a vdpa device using unregister | |
| * @mdev: parent device to use for device removal | |
| * @dev: vdpa device to remove | |
| * Driver need to remove the specified device by calling | |
| * _vdpa_unregister_device(). | |
| * @dev_set_attr: change a vdpa device's attr after it was create | |
| * @mdev: parent device to use for device | |
| * @dev: vdpa device structure | |
| * @config:Attributes to be set for the device. | |
| * The driver needs to check the mask of the structure and then set | |
| * the related information to the vdpa device. The driver must return 0 | |
| * if set successfully. | |
| */ | |
| struct vdpa_mgmtdev_ops { | |
| int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name, | |
| const struct vdpa_dev_set_config *config); | |
| void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev); | |
| int (*dev_set_attr)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev, | |
| const struct vdpa_dev_set_config *config); | |
| }; | |
| /** | |
| * struct vdpa_mgmt_dev - vdpa management device | |
| * @device: Management parent device | |
| * @ops: operations supported by management device | |
| * @id_table: Pointer to device id table of supported ids | |
| * @config_attr_mask: bit mask of attributes of type enum vdpa_attr that | |
| * management device support during dev_add callback | |
| * @list: list entry | |
| * @supported_features: features supported by device | |
| * @max_supported_vqs: maximum number of virtqueues supported by device | |
| */ | |
| struct vdpa_mgmt_dev { | |
| struct device *device; | |
| const struct vdpa_mgmtdev_ops *ops; | |
| struct virtio_device_id *id_table; | |
| u64 config_attr_mask; | |
| struct list_head list; | |
| u64 supported_features; | |
| u32 max_supported_vqs; | |
| }; | |
| int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev); | |
| void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev); | |
| #endif /* _LINUX_VDPA_H */ |