376 lines
12 KiB
C
376 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VDPA_H
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#define _LINUX_VDPA_H
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/vhost_iotlb.h>
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/**
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* vDPA callback definition.
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* @callback: interrupt callback function
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* @private: the data passed to the callback function
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*/
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struct vdpa_callback {
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irqreturn_t (*callback)(void *data);
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void *private;
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};
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/**
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* vDPA notification area
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* @addr: base address of the notification area
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* @size: size of the notification area
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*/
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struct vdpa_notification_area {
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resource_size_t addr;
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resource_size_t size;
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};
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/**
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* vDPA vq_state definition
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* @avail_index: available index
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*/
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struct vdpa_vq_state {
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u16 avail_index;
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};
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struct vdpa_mgmt_dev;
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/**
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* vDPA device - representation of a vDPA device
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* @dev: underlying device
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* @dma_dev: the actual device that is performing DMA
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* @config: the configuration ops for this device.
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* @index: device index
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* @features_valid: were features initialized? for legacy guests
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* @nvqs: maximum number of supported virtqueues
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* @mdev: management device pointer; caller must setup when registering device as part
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* of dev_add() mgmtdev ops callback before invoking _vdpa_register_device().
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*/
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struct vdpa_device {
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struct device dev;
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struct device *dma_dev;
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const struct vdpa_config_ops *config;
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unsigned int index;
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bool features_valid;
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int nvqs;
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struct vdpa_mgmt_dev *mdev;
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};
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/**
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* vDPA IOVA range - the IOVA range support by the device
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* @first: start of the IOVA range
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* @last: end of the IOVA range
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*/
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struct vdpa_iova_range {
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u64 first;
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u64 last;
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};
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/**
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* vDPA_config_ops - operations for configuring a vDPA device.
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* Note: vDPA device drivers are required to implement all of the
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* operations unless it is mentioned to be optional in the following
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* list.
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*
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* @set_vq_address: Set the address of virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @desc_area: address of desc area
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* @driver_area: address of driver area
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* @device_area: address of device area
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* Returns integer: success (0) or error (< 0)
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* @set_vq_num: Set the size of virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @num: the size of virtqueue
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* @kick_vq: Kick the virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @set_vq_cb: Set the interrupt callback function for
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* a virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @cb: virtio-vdev interrupt callback structure
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* @set_vq_ready: Set ready status for a virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @ready: ready (true) not ready(false)
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* @get_vq_ready: Get ready status for a virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* Returns boolean: ready (true) or not (false)
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* @set_vq_state: Set the state for a virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @state: pointer to set virtqueue state (last_avail_idx)
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* Returns integer: success (0) or error (< 0)
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* @get_vq_state: Get the state for a virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* @state: pointer to returned state (last_avail_idx)
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* @get_vq_notification: Get the notification area for a virtqueue
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* @vdev: vdpa device
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* @idx: virtqueue index
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* Returns the notifcation area
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* @get_vq_irq: Get the irq number of a virtqueue (optional,
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* but must implemented if require vq irq offloading)
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* @vdev: vdpa device
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* @idx: virtqueue index
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* Returns int: irq number of a virtqueue,
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* negative number if no irq assigned.
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* @get_vq_align: Get the virtqueue align requirement
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* for the device
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* @vdev: vdpa device
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* Returns virtqueue algin requirement
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* @get_features: Get virtio features supported by the device
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* @vdev: vdpa device
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* Returns the virtio features support by the
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* device
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* @set_features: Set virtio features supported by the driver
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* @vdev: vdpa device
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* @features: feature support by the driver
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* Returns integer: success (0) or error (< 0)
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* @set_config_cb: Set the config interrupt callback
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* @vdev: vdpa device
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* @cb: virtio-vdev interrupt callback structure
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* @get_vq_num_max: Get the max size of virtqueue
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* @vdev: vdpa device
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* Returns u16: max size of virtqueue
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* @get_device_id: Get virtio device id
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* @vdev: vdpa device
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* Returns u32: virtio device id
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* @get_vendor_id: Get id for the vendor that provides this device
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* @vdev: vdpa device
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* Returns u32: virtio vendor id
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* @get_status: Get the device status
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* @vdev: vdpa device
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* Returns u8: virtio device status
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* @set_status: Set the device status
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* @vdev: vdpa device
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* @status: virtio device status
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* @get_config: Read from device specific configuration space
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* @vdev: vdpa device
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* @offset: offset from the beginning of
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* configuration space
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* @buf: buffer used to read to
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* @len: the length to read from
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* configuration space
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* @set_config: Write to device specific configuration space
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* @vdev: vdpa device
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* @offset: offset from the beginning of
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* configuration space
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* @buf: buffer used to write from
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* @len: the length to write to
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* configuration space
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* @get_generation: Get device config generation (optional)
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* @vdev: vdpa device
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* Returns u32: device generation
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* @get_iova_range: Get supported iova range (optional)
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* @vdev: vdpa device
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* Returns the iova range supported by
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* the device.
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* @set_map: Set device memory mapping (optional)
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* Needed for device that using device
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* specific DMA translation (on-chip IOMMU)
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* @vdev: vdpa device
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* @iotlb: vhost memory mapping to be
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* used by the vDPA
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* Returns integer: success (0) or error (< 0)
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* @dma_map: Map an area of PA to IOVA (optional)
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* Needed for device that using device
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* specific DMA translation (on-chip IOMMU)
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* and preferring incremental map.
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* @vdev: vdpa device
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* @iova: iova to be mapped
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* @size: size of the area
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* @pa: physical address for the map
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* @perm: device access permission (VHOST_MAP_XX)
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* Returns integer: success (0) or error (< 0)
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* @dma_unmap: Unmap an area of IOVA (optional but
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* must be implemented with dma_map)
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* Needed for device that using device
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* specific DMA translation (on-chip IOMMU)
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* and preferring incremental unmap.
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* @vdev: vdpa device
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* @iova: iova to be unmapped
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* @size: size of the area
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* Returns integer: success (0) or error (< 0)
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* @free: Free resources that belongs to vDPA (optional)
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* @vdev: vdpa device
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*/
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struct vdpa_config_ops {
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/* Virtqueue ops */
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int (*set_vq_address)(struct vdpa_device *vdev,
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u16 idx, u64 desc_area, u64 driver_area,
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u64 device_area);
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void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num);
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void (*kick_vq)(struct vdpa_device *vdev, u16 idx);
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void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx,
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struct vdpa_callback *cb);
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void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready);
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bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx);
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int (*set_vq_state)(struct vdpa_device *vdev, u16 idx,
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const struct vdpa_vq_state *state);
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int (*get_vq_state)(struct vdpa_device *vdev, u16 idx,
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struct vdpa_vq_state *state);
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struct vdpa_notification_area
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(*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
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/* vq irq is not expected to be changed once DRIVER_OK is set */
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int (*get_vq_irq)(struct vdpa_device *vdv, u16 idx);
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/* Device ops */
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u32 (*get_vq_align)(struct vdpa_device *vdev);
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u64 (*get_features)(struct vdpa_device *vdev);
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int (*set_features)(struct vdpa_device *vdev, u64 features);
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void (*set_config_cb)(struct vdpa_device *vdev,
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struct vdpa_callback *cb);
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u16 (*get_vq_num_max)(struct vdpa_device *vdev);
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u32 (*get_device_id)(struct vdpa_device *vdev);
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u32 (*get_vendor_id)(struct vdpa_device *vdev);
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u8 (*get_status)(struct vdpa_device *vdev);
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void (*set_status)(struct vdpa_device *vdev, u8 status);
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void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
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void *buf, unsigned int len);
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void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
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const void *buf, unsigned int len);
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u32 (*get_generation)(struct vdpa_device *vdev);
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struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev);
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/* DMA ops */
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int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb);
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int (*dma_map)(struct vdpa_device *vdev, u64 iova, u64 size,
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u64 pa, u32 perm);
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int (*dma_unmap)(struct vdpa_device *vdev, u64 iova, u64 size);
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/* Free device resources */
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void (*free)(struct vdpa_device *vdev);
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};
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struct vdpa_device *__vdpa_alloc_device(struct device *parent,
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const struct vdpa_config_ops *config,
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int nvqs, size_t size, const char *name);
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#define vdpa_alloc_device(dev_struct, member, parent, config, nvqs, name) \
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container_of(__vdpa_alloc_device( \
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parent, config, nvqs, \
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sizeof(dev_struct) + \
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BUILD_BUG_ON_ZERO(offsetof( \
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dev_struct, member)), name), \
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dev_struct, member)
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int vdpa_register_device(struct vdpa_device *vdev);
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void vdpa_unregister_device(struct vdpa_device *vdev);
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int _vdpa_register_device(struct vdpa_device *vdev);
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void _vdpa_unregister_device(struct vdpa_device *vdev);
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/**
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* vdpa_driver - operations for a vDPA driver
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* @driver: underlying device driver
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* @probe: the function to call when a device is found. Returns 0 or -errno.
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* @remove: the function to call when a device is removed.
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*/
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struct vdpa_driver {
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struct device_driver driver;
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int (*probe)(struct vdpa_device *vdev);
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void (*remove)(struct vdpa_device *vdev);
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};
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#define vdpa_register_driver(drv) \
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__vdpa_register_driver(drv, THIS_MODULE)
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int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner);
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void vdpa_unregister_driver(struct vdpa_driver *drv);
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#define module_vdpa_driver(__vdpa_driver) \
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module_driver(__vdpa_driver, vdpa_register_driver, \
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vdpa_unregister_driver)
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static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver)
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{
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return container_of(driver, struct vdpa_driver, driver);
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}
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static inline struct vdpa_device *dev_to_vdpa(struct device *_dev)
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{
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return container_of(_dev, struct vdpa_device, dev);
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}
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static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev)
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{
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return dev_get_drvdata(&vdev->dev);
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}
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static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data)
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{
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dev_set_drvdata(&vdev->dev, data);
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}
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static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev)
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{
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return vdev->dma_dev;
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}
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static inline void vdpa_reset(struct vdpa_device *vdev)
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{
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const struct vdpa_config_ops *ops = vdev->config;
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vdev->features_valid = false;
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ops->set_status(vdev, 0);
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}
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static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)
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{
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const struct vdpa_config_ops *ops = vdev->config;
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vdev->features_valid = true;
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return ops->set_features(vdev, features);
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}
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static inline void vdpa_get_config(struct vdpa_device *vdev, unsigned offset,
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void *buf, unsigned int len)
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{
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const struct vdpa_config_ops *ops = vdev->config;
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/*
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* Config accesses aren't supposed to trigger before features are set.
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* If it does happen we assume a legacy guest.
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*/
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if (!vdev->features_valid)
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vdpa_set_features(vdev, 0);
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ops->get_config(vdev, offset, buf, len);
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}
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/**
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* vdpa_mgmtdev_ops - vdpa device ops
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* @dev_add: Add a vdpa device using alloc and register
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* @mdev: parent device to use for device addition
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* @name: name of the new vdpa device
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* Driver need to add a new device using _vdpa_register_device()
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* after fully initializing the vdpa device. Driver must return 0
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* on success or appropriate error code.
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* @dev_del: Remove a vdpa device using unregister
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* @mdev: parent device to use for device removal
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* @dev: vdpa device to remove
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* Driver need to remove the specified device by calling
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* _vdpa_unregister_device().
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*/
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struct vdpa_mgmtdev_ops {
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int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name);
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void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev);
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};
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struct vdpa_mgmt_dev {
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struct device *device;
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const struct vdpa_mgmtdev_ops *ops;
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const struct virtio_device_id *id_table; /* supported ids */
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struct list_head list;
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};
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int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev);
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void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev);
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#endif /* _LINUX_VDPA_H */
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