/* 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/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 { … }; /** * struct vdpa_notification_area - vDPA notification area * @addr: base address of the notification area * @size: size of the notification area */ struct vdpa_notification_area { … }; /** * struct vdpa_vq_state_split - vDPA split virtqueue state * @avail_index: available index */ struct vdpa_vq_state_split { … }; /** * 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 { … }; struct vdpa_vq_state { … }; struct vdpa_mgmt_dev; /** * struct vdpa_device - representation of a vDPA device * @dev: underlying device * @dma_dev: the actual device that is performing DMA * @driver_override: driver name to force a match; do not set directly, * because core frees it; use driver_set_override() to * set or clear it. * @config: the configuration 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 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 { … }; struct vdpa_dev_set_config { … }; /** * 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 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_dma_dev: Get the dma device for a specific * virtqueue (optional) * @vdev: vdpa device * @idx: virtqueue index * Returns pointer to structure device or 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 { … }; struct vdpa_device *__vdpa_alloc_device(struct device *parent, const struct vdpa_config_ops *config, 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 * @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, ngroups, nas, \ name, use_va) … 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 { … }; #define vdpa_register_driver(drv) … 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) … static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver) { … } static inline struct vdpa_device *dev_to_vdpa(struct device *_dev) { … } static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev) { … } static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data) { … } static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) { … } static inline int vdpa_reset(struct vdpa_device *vdev, u32 flags) { … } static inline int vdpa_set_features_unlocked(struct vdpa_device *vdev, u64 features) { … } static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) { … } 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(). */ struct vdpa_mgmtdev_ops { … }; /** * 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 { … }; int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev); void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev); #endif /* _LINUX_VDPA_H */
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