forked from mirrors/linux
f6d955d808
Avoid the wrapper holding cf_mutex since it is not protecting anything.
To avoid confusion and unnecessary overhead incurred by it, remove.
Fixes: f489f27bc0ab ("vdpa: Sync calls set/get config/status with cf_mutex")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220111183400.38418-2-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
469 lines
15 KiB
C
469 lines
15 KiB
C
/* 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/if_ether.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
|
|
* @driver_override: driver name to force a match
|
|
* @config: the configuration ops for this device.
|
|
* @cf_mutex: Protects get and set access to configuration layout.
|
|
* @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 char *driver_override;
|
|
const struct vdpa_config_ops *config;
|
|
struct mutex cf_mutex; /* Protects get/set 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;
|
|
};
|
|
|
|
struct vdpa_dev_set_config {
|
|
struct {
|
|
u8 mac[ETH_ALEN];
|
|
u16 mtu;
|
|
u16 max_vq_pairs;
|
|
} net;
|
|
u64 mask;
|
|
};
|
|
|
|
/**
|
|
* 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 (optional)
|
|
* @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_device_features: Get virtio features supported by the device
|
|
* @vdev: vdpa device
|
|
* Returns the virtio features support 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)
|
|
* @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 *vdev, u16 idx);
|
|
|
|
/* Device ops */
|
|
u32 (*get_vq_align)(struct vdpa_device *vdev);
|
|
u64 (*get_device_features)(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);
|
|
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;
|
|
int ret;
|
|
|
|
mutex_lock(&vdev->cf_mutex);
|
|
vdev->features_valid = false;
|
|
ret = ops->reset(vdev);
|
|
mutex_unlock(&vdev->cf_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features, bool locked)
|
|
{
|
|
const struct vdpa_config_ops *ops = vdev->config;
|
|
int ret;
|
|
|
|
if (!locked)
|
|
mutex_lock(&vdev->cf_mutex);
|
|
|
|
vdev->features_valid = true;
|
|
ret = ops->set_driver_features(vdev, features);
|
|
if (!locked)
|
|
mutex_unlock(&vdev->cf_mutex);
|
|
|
|
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().
|
|
*/
|
|
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);
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
struct vdpa_mgmt_dev {
|
|
struct device *device;
|
|
const struct vdpa_mgmtdev_ops *ops;
|
|
const 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 */
|