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Edit File: vdpa.h

/* 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> /** * struct vdpa_calllback - vDPA callback definition. * @callback: interrupt callback function * @private: the data passed to the callback function */ struct vdpa_callback { irqreturn_t (*callback)(void *data); void *private; }; /** * 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 * @dma_dev: the actual device that is performing DMA * @config: the configuration ops for this device. * @index: device index * @features_valid: were features initialized? for legacy guests * @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; struct device *dma_dev; const struct vdpa_config_ops *config; unsigned int index; bool features_valid; bool use_va; int nvqs; struct vdpa_mgmt_dev *mdev; }; /** * 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; }; /** * Corresponding 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 * @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_vq_notification: Get the notification area for a virtqueue * @vdev: vdpa device * @idx: virtqueue index * Returns the notifcation 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_align: Get the virtqueue align requirement * for the device * @vdev: vdpa device * Returns virtqueue algin requirement * @get_features: Get virtio features supported by the device * @vdev: vdpa device * Returns the virtio features support by the * device * @set_features: Set virtio features supported by the driver * @vdev: vdpa device * @features: feature support by the driver * Returns integer: success (0) or error (< 0) * @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_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) * @get_config_size: Get the size of the configuration space * @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_map: Set device memory mapping (optional) * Needed for device that using device * specific DMA translation (on-chip IOMMU) * @vdev: vdpa device * @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 * @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 * @iova: iova to be unmapped * @size: size of the area * Returns integer: success (0) or error (< 0) * @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 (*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); 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 *vdv, u16 idx); /* Device ops */ u32 (*get_vq_align)(struct vdpa_device *vdev); u64 (*get_features)(struct vdpa_device *vdev); int (*set_features)(struct vdpa_device *vdev, u64 features); void (*set_config_cb)(struct vdpa_device *vdev, struct vdpa_callback *cb); u16 (*get_vq_num_max)(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); 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); /* DMA ops */ int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb); int (*dma_map)(struct vdpa_device *vdev, u64 iova, u64 size, u64 pa, u32 perm, void *opaque); int (*dma_unmap)(struct vdpa_device *vdev, u64 iova, u64 size); /* Free device resources */ void (*free)(struct vdpa_device *vdev); }; struct vdpa_device *__vdpa_alloc_device(struct device *parent, const struct vdpa_config_ops *config, 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 * @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, name, use_va) \ container_of(__vdpa_alloc_device( \ parent, config, \ 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, int nvqs); void vdpa_unregister_device(struct vdpa_device *vdev); int _vdpa_register_device(struct vdpa_device *vdev, int 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 struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) { return vdev->dma_dev; } static inline int vdpa_reset(struct vdpa_device *vdev) { const struct vdpa_config_ops *ops = vdev->config; vdev->features_valid = false; return ops->reset(vdev); } static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) { const struct vdpa_config_ops *ops = vdev->config; vdev->features_valid = true; return ops->set_features(vdev, features); } static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, void *buf, unsigned int len) { const struct vdpa_config_ops *ops = vdev->config; /* * Config accesses aren't supposed to trigger before features are set. * If it does happen we assume a legacy guest. */ if (!vdev->features_valid) vdpa_set_features(vdev, 0); ops->get_config(vdev, offset, buf, len); } /** * 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 * 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 { int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name); void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev); }; struct vdpa_mgmt_dev { struct device *device; const struct vdpa_mgmtdev_ops *ops; const struct virtio_device_id *id_table; /* supported ids */ struct list_head list; }; int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev); void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev); #endif /* _LINUX_VDPA_H */