Merge branch 'elan-i2c' into next
[linux-2.6-microblaze.git] / include / linux / vdpa.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_VDPA_H
3 #define _LINUX_VDPA_H
4
5 #include <linux/kernel.h>
6 #include <linux/device.h>
7 #include <linux/interrupt.h>
8 #include <linux/vhost_iotlb.h>
9
10 /**
11  * vDPA callback definition.
12  * @callback: interrupt callback function
13  * @private: the data passed to the callback function
14  */
15 struct vdpa_callback {
16         irqreturn_t (*callback)(void *data);
17         void *private;
18 };
19
20 /**
21  * vDPA device - representation of a vDPA device
22  * @dev: underlying device
23  * @dma_dev: the actual device that is performing DMA
24  * @config: the configuration ops for this device.
25  * @index: device index
26  */
27 struct vdpa_device {
28         struct device dev;
29         struct device *dma_dev;
30         const struct vdpa_config_ops *config;
31         unsigned int index;
32 };
33
34 /**
35  * vDPA_config_ops - operations for configuring a vDPA device.
36  * Note: vDPA device drivers are required to implement all of the
37  * operations unless it is mentioned to be optional in the following
38  * list.
39  *
40  * @set_vq_address:             Set the address of virtqueue
41  *                              @vdev: vdpa device
42  *                              @idx: virtqueue index
43  *                              @desc_area: address of desc area
44  *                              @driver_area: address of driver area
45  *                              @device_area: address of device area
46  *                              Returns integer: success (0) or error (< 0)
47  * @set_vq_num:                 Set the size of virtqueue
48  *                              @vdev: vdpa device
49  *                              @idx: virtqueue index
50  *                              @num: the size of virtqueue
51  * @kick_vq:                    Kick the virtqueue
52  *                              @vdev: vdpa device
53  *                              @idx: virtqueue index
54  * @set_vq_cb:                  Set the interrupt callback function for
55  *                              a virtqueue
56  *                              @vdev: vdpa device
57  *                              @idx: virtqueue index
58  *                              @cb: virtio-vdev interrupt callback structure
59  * @set_vq_ready:               Set ready status for a virtqueue
60  *                              @vdev: vdpa device
61  *                              @idx: virtqueue index
62  *                              @ready: ready (true) not ready(false)
63  * @get_vq_ready:               Get ready status for a virtqueue
64  *                              @vdev: vdpa device
65  *                              @idx: virtqueue index
66  *                              Returns boolean: ready (true) or not (false)
67  * @set_vq_state:               Set the state for a virtqueue
68  *                              @vdev: vdpa device
69  *                              @idx: virtqueue index
70  *                              @state: virtqueue state (last_avail_idx)
71  *                              Returns integer: success (0) or error (< 0)
72  * @get_vq_state:               Get the state for a virtqueue
73  *                              @vdev: vdpa device
74  *                              @idx: virtqueue index
75  *                              Returns virtqueue state (last_avail_idx)
76  * @get_vq_align:               Get the virtqueue align requirement
77  *                              for the device
78  *                              @vdev: vdpa device
79  *                              Returns virtqueue algin requirement
80  * @get_features:               Get virtio features supported by the device
81  *                              @vdev: vdpa device
82  *                              Returns the virtio features support by the
83  *                              device
84  * @set_features:               Set virtio features supported by the driver
85  *                              @vdev: vdpa device
86  *                              @features: feature support by the driver
87  *                              Returns integer: success (0) or error (< 0)
88  * @set_config_cb:              Set the config interrupt callback
89  *                              @vdev: vdpa device
90  *                              @cb: virtio-vdev interrupt callback structure
91  * @get_vq_num_max:             Get the max size of virtqueue
92  *                              @vdev: vdpa device
93  *                              Returns u16: max size of virtqueue
94  * @get_device_id:              Get virtio device id
95  *                              @vdev: vdpa device
96  *                              Returns u32: virtio device id
97  * @get_vendor_id:              Get id for the vendor that provides this device
98  *                              @vdev: vdpa device
99  *                              Returns u32: virtio vendor id
100  * @get_status:                 Get the device status
101  *                              @vdev: vdpa device
102  *                              Returns u8: virtio device status
103  * @set_status:                 Set the device status
104  *                              @vdev: vdpa device
105  *                              @status: virtio device status
106  * @get_config:                 Read from device specific configuration space
107  *                              @vdev: vdpa device
108  *                              @offset: offset from the beginning of
109  *                              configuration space
110  *                              @buf: buffer used to read to
111  *                              @len: the length to read from
112  *                              configuration space
113  * @set_config:                 Write to device specific configuration space
114  *                              @vdev: vdpa device
115  *                              @offset: offset from the beginning of
116  *                              configuration space
117  *                              @buf: buffer used to write from
118  *                              @len: the length to write to
119  *                              configuration space
120  * @get_generation:             Get device config generation (optional)
121  *                              @vdev: vdpa device
122  *                              Returns u32: device generation
123  * @set_map:                    Set device memory mapping (optional)
124  *                              Needed for device that using device
125  *                              specific DMA translation (on-chip IOMMU)
126  *                              @vdev: vdpa device
127  *                              @iotlb: vhost memory mapping to be
128  *                              used by the vDPA
129  *                              Returns integer: success (0) or error (< 0)
130  * @dma_map:                    Map an area of PA to IOVA (optional)
131  *                              Needed for device that using device
132  *                              specific DMA translation (on-chip IOMMU)
133  *                              and preferring incremental map.
134  *                              @vdev: vdpa device
135  *                              @iova: iova to be mapped
136  *                              @size: size of the area
137  *                              @pa: physical address for the map
138  *                              @perm: device access permission (VHOST_MAP_XX)
139  *                              Returns integer: success (0) or error (< 0)
140  * @dma_unmap:                  Unmap an area of IOVA (optional but
141  *                              must be implemented with dma_map)
142  *                              Needed for device that using device
143  *                              specific DMA translation (on-chip IOMMU)
144  *                              and preferring incremental unmap.
145  *                              @vdev: vdpa device
146  *                              @iova: iova to be unmapped
147  *                              @size: size of the area
148  *                              Returns integer: success (0) or error (< 0)
149  * @free:                       Free resources that belongs to vDPA (optional)
150  *                              @vdev: vdpa device
151  */
152 struct vdpa_config_ops {
153         /* Virtqueue ops */
154         int (*set_vq_address)(struct vdpa_device *vdev,
155                               u16 idx, u64 desc_area, u64 driver_area,
156                               u64 device_area);
157         void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num);
158         void (*kick_vq)(struct vdpa_device *vdev, u16 idx);
159         void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx,
160                           struct vdpa_callback *cb);
161         void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready);
162         bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx);
163         int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, u64 state);
164         u64 (*get_vq_state)(struct vdpa_device *vdev, u16 idx);
165
166         /* Device ops */
167         u32 (*get_vq_align)(struct vdpa_device *vdev);
168         u64 (*get_features)(struct vdpa_device *vdev);
169         int (*set_features)(struct vdpa_device *vdev, u64 features);
170         void (*set_config_cb)(struct vdpa_device *vdev,
171                               struct vdpa_callback *cb);
172         u16 (*get_vq_num_max)(struct vdpa_device *vdev);
173         u32 (*get_device_id)(struct vdpa_device *vdev);
174         u32 (*get_vendor_id)(struct vdpa_device *vdev);
175         u8 (*get_status)(struct vdpa_device *vdev);
176         void (*set_status)(struct vdpa_device *vdev, u8 status);
177         void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
178                            void *buf, unsigned int len);
179         void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
180                            const void *buf, unsigned int len);
181         u32 (*get_generation)(struct vdpa_device *vdev);
182
183         /* DMA ops */
184         int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb);
185         int (*dma_map)(struct vdpa_device *vdev, u64 iova, u64 size,
186                        u64 pa, u32 perm);
187         int (*dma_unmap)(struct vdpa_device *vdev, u64 iova, u64 size);
188
189         /* Free device resources */
190         void (*free)(struct vdpa_device *vdev);
191 };
192
193 struct vdpa_device *__vdpa_alloc_device(struct device *parent,
194                                         const struct vdpa_config_ops *config,
195                                         size_t size);
196
197 #define vdpa_alloc_device(dev_struct, member, parent, config)   \
198                           container_of(__vdpa_alloc_device( \
199                                        parent, config, \
200                                        sizeof(dev_struct) + \
201                                        BUILD_BUG_ON_ZERO(offsetof( \
202                                        dev_struct, member))), \
203                                        dev_struct, member)
204
205 int vdpa_register_device(struct vdpa_device *vdev);
206 void vdpa_unregister_device(struct vdpa_device *vdev);
207
208 /**
209  * vdpa_driver - operations for a vDPA driver
210  * @driver: underlying device driver
211  * @probe: the function to call when a device is found.  Returns 0 or -errno.
212  * @remove: the function to call when a device is removed.
213  */
214 struct vdpa_driver {
215         struct device_driver driver;
216         int (*probe)(struct vdpa_device *vdev);
217         void (*remove)(struct vdpa_device *vdev);
218 };
219
220 #define vdpa_register_driver(drv) \
221         __vdpa_register_driver(drv, THIS_MODULE)
222 int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner);
223 void vdpa_unregister_driver(struct vdpa_driver *drv);
224
225 #define module_vdpa_driver(__vdpa_driver) \
226         module_driver(__vdpa_driver, vdpa_register_driver,      \
227                       vdpa_unregister_driver)
228
229 static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver)
230 {
231         return container_of(driver, struct vdpa_driver, driver);
232 }
233
234 static inline struct vdpa_device *dev_to_vdpa(struct device *_dev)
235 {
236         return container_of(_dev, struct vdpa_device, dev);
237 }
238
239 static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev)
240 {
241         return dev_get_drvdata(&vdev->dev);
242 }
243
244 static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data)
245 {
246         dev_set_drvdata(&vdev->dev, data);
247 }
248
249 static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev)
250 {
251         return vdev->dma_dev;
252 }
253 #endif /* _LINUX_VDPA_H */