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961e9c84 JW |
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> | |
d8ca2fa5 PP |
9 | #include <linux/virtio_net.h> |
10 | #include <linux/if_ether.h> | |
961e9c84 JW |
11 | |
12 | /** | |
d0f9164e | 13 | * struct vdpa_calllback - vDPA callback definition. |
961e9c84 JW |
14 | * @callback: interrupt callback function |
15 | * @private: the data passed to the callback function | |
16 | */ | |
17 | struct vdpa_callback { | |
18 | irqreturn_t (*callback)(void *data); | |
19 | void *private; | |
20 | }; | |
21 | ||
c25a26e6 | 22 | /** |
d0f9164e | 23 | * struct vdpa_notification_area - vDPA notification area |
c25a26e6 JW |
24 | * @addr: base address of the notification area |
25 | * @size: size of the notification area | |
26 | */ | |
27 | struct vdpa_notification_area { | |
28 | resource_size_t addr; | |
29 | resource_size_t size; | |
30 | }; | |
31 | ||
aac50c0b | 32 | /** |
530a5678 | 33 | * struct vdpa_vq_state_split - vDPA split virtqueue state |
aac50c0b EC |
34 | * @avail_index: available index |
35 | */ | |
530a5678 | 36 | struct vdpa_vq_state_split { |
aac50c0b EC |
37 | u16 avail_index; |
38 | }; | |
39 | ||
530a5678 JW |
40 | /** |
41 | * struct vdpa_vq_state_packed - vDPA packed virtqueue state | |
42 | * @last_avail_counter: last driver ring wrap counter observed by device | |
43 | * @last_avail_idx: device available index | |
44 | * @last_used_counter: device ring wrap counter | |
45 | * @last_used_idx: used index | |
46 | */ | |
47 | struct vdpa_vq_state_packed { | |
86e17a51 XY |
48 | u16 last_avail_counter:1; |
49 | u16 last_avail_idx:15; | |
50 | u16 last_used_counter:1; | |
51 | u16 last_used_idx:15; | |
530a5678 JW |
52 | }; |
53 | ||
54 | struct vdpa_vq_state { | |
86e17a51 XY |
55 | union { |
56 | struct vdpa_vq_state_split split; | |
57 | struct vdpa_vq_state_packed packed; | |
58 | }; | |
530a5678 JW |
59 | }; |
60 | ||
33b34750 PP |
61 | struct vdpa_mgmt_dev; |
62 | ||
961e9c84 | 63 | /** |
d0f9164e | 64 | * struct vdpa_device - representation of a vDPA device |
961e9c84 JW |
65 | * @dev: underlying device |
66 | * @dma_dev: the actual device that is performing DMA | |
240bf4e6 KK |
67 | * @driver_override: driver name to force a match; do not set directly, |
68 | * because core frees it; use driver_set_override() to | |
69 | * set or clear it. | |
961e9c84 | 70 | * @config: the configuration ops for this device. |
a6a51adc | 71 | * @cf_lock: Protects get and set access to configuration layout. |
961e9c84 | 72 | * @index: device index |
452639a6 | 73 | * @features_valid: were features initialized? for legacy guests |
db9adcbf GD |
74 | * @ngroups: the number of virtqueue groups |
75 | * @nas: the number of address spaces | |
d8945ec4 | 76 | * @use_va: indicate whether virtual address must be used by this device |
476c135e | 77 | * @nvqs: maximum number of supported virtqueues |
903f7bca PP |
78 | * @mdev: management device pointer; caller must setup when registering device as part |
79 | * of dev_add() mgmtdev ops callback before invoking _vdpa_register_device(). | |
961e9c84 JW |
80 | */ |
81 | struct vdpa_device { | |
82 | struct device dev; | |
83 | struct device *dma_dev; | |
539fec78 | 84 | const char *driver_override; |
961e9c84 | 85 | const struct vdpa_config_ops *config; |
a6a51adc | 86 | struct rw_semaphore cf_lock; /* Protects get/set config */ |
961e9c84 | 87 | unsigned int index; |
452639a6 | 88 | bool features_valid; |
d8945ec4 | 89 | bool use_va; |
81d46d69 | 90 | u32 nvqs; |
903f7bca | 91 | struct vdpa_mgmt_dev *mdev; |
d4821902 | 92 | unsigned int ngroups; |
db9adcbf | 93 | unsigned int nas; |
961e9c84 JW |
94 | }; |
95 | ||
3f1b623a | 96 | /** |
d0f9164e | 97 | * struct vdpa_iova_range - the IOVA range support by the device |
3f1b623a JW |
98 | * @first: start of the IOVA range |
99 | * @last: end of the IOVA range | |
100 | */ | |
101 | struct vdpa_iova_range { | |
102 | u64 first; | |
103 | u64 last; | |
104 | }; | |
105 | ||
d8ca2fa5 | 106 | struct vdpa_dev_set_config { |
90fea5a8 | 107 | u64 device_features; |
d8ca2fa5 PP |
108 | struct { |
109 | u8 mac[ETH_ALEN]; | |
110 | u16 mtu; | |
aba21aff | 111 | u16 max_vq_pairs; |
d8ca2fa5 PP |
112 | } net; |
113 | u64 mask; | |
114 | }; | |
115 | ||
d8945ec4 XY |
116 | /** |
117 | * Corresponding file area for device memory mapping | |
118 | * @file: vma->vm_file for the mapping | |
119 | * @offset: mapping offset in the vm_file | |
120 | */ | |
121 | struct vdpa_map_file { | |
122 | struct file *file; | |
123 | u64 offset; | |
124 | }; | |
125 | ||
961e9c84 | 126 | /** |
d0f9164e | 127 | * struct vdpa_config_ops - operations for configuring a vDPA device. |
961e9c84 JW |
128 | * Note: vDPA device drivers are required to implement all of the |
129 | * operations unless it is mentioned to be optional in the following | |
130 | * list. | |
131 | * | |
132 | * @set_vq_address: Set the address of virtqueue | |
133 | * @vdev: vdpa device | |
134 | * @idx: virtqueue index | |
135 | * @desc_area: address of desc area | |
136 | * @driver_area: address of driver area | |
137 | * @device_area: address of device area | |
138 | * Returns integer: success (0) or error (< 0) | |
139 | * @set_vq_num: Set the size of virtqueue | |
140 | * @vdev: vdpa device | |
141 | * @idx: virtqueue index | |
142 | * @num: the size of virtqueue | |
143 | * @kick_vq: Kick the virtqueue | |
144 | * @vdev: vdpa device | |
145 | * @idx: virtqueue index | |
146 | * @set_vq_cb: Set the interrupt callback function for | |
147 | * a virtqueue | |
148 | * @vdev: vdpa device | |
149 | * @idx: virtqueue index | |
150 | * @cb: virtio-vdev interrupt callback structure | |
151 | * @set_vq_ready: Set ready status for a virtqueue | |
152 | * @vdev: vdpa device | |
153 | * @idx: virtqueue index | |
154 | * @ready: ready (true) not ready(false) | |
155 | * @get_vq_ready: Get ready status for a virtqueue | |
156 | * @vdev: vdpa device | |
157 | * @idx: virtqueue index | |
158 | * Returns boolean: ready (true) or not (false) | |
159 | * @set_vq_state: Set the state for a virtqueue | |
160 | * @vdev: vdpa device | |
161 | * @idx: virtqueue index | |
aac50c0b | 162 | * @state: pointer to set virtqueue state (last_avail_idx) |
961e9c84 JW |
163 | * Returns integer: success (0) or error (< 0) |
164 | * @get_vq_state: Get the state for a virtqueue | |
165 | * @vdev: vdpa device | |
166 | * @idx: virtqueue index | |
aac50c0b | 167 | * @state: pointer to returned state (last_avail_idx) |
28cc408b | 168 | * @get_vq_notification: Get the notification area for a virtqueue (optional) |
c25a26e6 JW |
169 | * @vdev: vdpa device |
170 | * @idx: virtqueue index | |
171 | * Returns the notifcation area | |
7164675a ZL |
172 | * @get_vq_irq: Get the irq number of a virtqueue (optional, |
173 | * but must implemented if require vq irq offloading) | |
174 | * @vdev: vdpa device | |
175 | * @idx: virtqueue index | |
176 | * Returns int: irq number of a virtqueue, | |
177 | * negative number if no irq assigned. | |
961e9c84 JW |
178 | * @get_vq_align: Get the virtqueue align requirement |
179 | * for the device | |
180 | * @vdev: vdpa device | |
181 | * Returns virtqueue algin requirement | |
00d1f546 JW |
182 | * @get_vq_group: Get the group id for a specific |
183 | * virtqueue (optional) | |
d4821902 GD |
184 | * @vdev: vdpa device |
185 | * @idx: virtqueue index | |
186 | * Returns u32: group id for this virtqueue | |
a64917bc | 187 | * @get_device_features: Get virtio features supported by the device |
961e9c84 JW |
188 | * @vdev: vdpa device |
189 | * Returns the virtio features support by the | |
190 | * device | |
a64917bc | 191 | * @set_driver_features: Set virtio features supported by the driver |
961e9c84 JW |
192 | * @vdev: vdpa device |
193 | * @features: feature support by the driver | |
194 | * Returns integer: success (0) or error (< 0) | |
a64917bc EC |
195 | * @get_driver_features: Get the virtio driver features in action |
196 | * @vdev: vdpa device | |
197 | * Returns the virtio features accepted | |
961e9c84 JW |
198 | * @set_config_cb: Set the config interrupt callback |
199 | * @vdev: vdpa device | |
200 | * @cb: virtio-vdev interrupt callback structure | |
201 | * @get_vq_num_max: Get the max size of virtqueue | |
202 | * @vdev: vdpa device | |
203 | * Returns u16: max size of virtqueue | |
3b970a58 WZ |
204 | * @get_vq_num_min: Get the min size of virtqueue (optional) |
205 | * @vdev: vdpa device | |
206 | * Returns u16: min size of virtqueue | |
961e9c84 JW |
207 | * @get_device_id: Get virtio device id |
208 | * @vdev: vdpa device | |
209 | * Returns u32: virtio device id | |
210 | * @get_vendor_id: Get id for the vendor that provides this device | |
211 | * @vdev: vdpa device | |
212 | * Returns u32: virtio vendor id | |
213 | * @get_status: Get the device status | |
214 | * @vdev: vdpa device | |
215 | * Returns u8: virtio device status | |
216 | * @set_status: Set the device status | |
217 | * @vdev: vdpa device | |
218 | * @status: virtio device status | |
0686082d XY |
219 | * @reset: Reset device |
220 | * @vdev: vdpa device | |
221 | * Returns integer: success (0) or error (< 0) | |
1538a8a4 SB |
222 | * @suspend: Suspend the device (optional) |
223 | * @vdev: vdpa device | |
224 | * Returns integer: success (0) or error (< 0) | |
225 | * @resume: Resume the device (optional) | |
848ecea1 EP |
226 | * @vdev: vdpa device |
227 | * Returns integer: success (0) or error (< 0) | |
a61280dd L |
228 | * @get_config_size: Get the size of the configuration space includes |
229 | * fields that are conditional on feature bits. | |
442706f9 SG |
230 | * @vdev: vdpa device |
231 | * Returns size_t: configuration size | |
961e9c84 JW |
232 | * @get_config: Read from device specific configuration space |
233 | * @vdev: vdpa device | |
234 | * @offset: offset from the beginning of | |
235 | * configuration space | |
236 | * @buf: buffer used to read to | |
237 | * @len: the length to read from | |
238 | * configuration space | |
239 | * @set_config: Write to device specific configuration space | |
240 | * @vdev: vdpa device | |
241 | * @offset: offset from the beginning of | |
242 | * configuration space | |
243 | * @buf: buffer used to write from | |
244 | * @len: the length to write to | |
245 | * configuration space | |
246 | * @get_generation: Get device config generation (optional) | |
247 | * @vdev: vdpa device | |
248 | * Returns u32: device generation | |
3f1b623a JW |
249 | * @get_iova_range: Get supported iova range (optional) |
250 | * @vdev: vdpa device | |
251 | * Returns the iova range supported by | |
252 | * the device. | |
1d246927 XY |
253 | * @set_vq_affinity: Set the affinity of virtqueue (optional) |
254 | * @vdev: vdpa device | |
255 | * @idx: virtqueue index | |
256 | * @cpu_mask: the affinity mask | |
257 | * Returns integer: success (0) or error (< 0) | |
258 | * @get_vq_affinity: Get the affinity of virtqueue (optional) | |
259 | * @vdev: vdpa device | |
260 | * @idx: virtqueue index | |
261 | * Returns the affinity mask | |
46d554b1 | 262 | * @set_group_asid: Set address space identifier for a |
00d1f546 | 263 | * virtqueue group (optional) |
46d554b1 GD |
264 | * @vdev: vdpa device |
265 | * @group: virtqueue group | |
266 | * @asid: address space id for this group | |
267 | * Returns integer: success (0) or error (< 0) | |
961e9c84 JW |
268 | * @set_map: Set device memory mapping (optional) |
269 | * Needed for device that using device | |
270 | * specific DMA translation (on-chip IOMMU) | |
271 | * @vdev: vdpa device | |
db9adcbf | 272 | * @asid: address space identifier |
961e9c84 JW |
273 | * @iotlb: vhost memory mapping to be |
274 | * used by the vDPA | |
275 | * Returns integer: success (0) or error (< 0) | |
276 | * @dma_map: Map an area of PA to IOVA (optional) | |
277 | * Needed for device that using device | |
278 | * specific DMA translation (on-chip IOMMU) | |
279 | * and preferring incremental map. | |
280 | * @vdev: vdpa device | |
db9adcbf | 281 | * @asid: address space identifier |
961e9c84 JW |
282 | * @iova: iova to be mapped |
283 | * @size: size of the area | |
284 | * @pa: physical address for the map | |
285 | * @perm: device access permission (VHOST_MAP_XX) | |
286 | * Returns integer: success (0) or error (< 0) | |
287 | * @dma_unmap: Unmap an area of IOVA (optional but | |
288 | * must be implemented with dma_map) | |
289 | * Needed for device that using device | |
290 | * specific DMA translation (on-chip IOMMU) | |
291 | * and preferring incremental unmap. | |
292 | * @vdev: vdpa device | |
db9adcbf | 293 | * @asid: address space identifier |
961e9c84 JW |
294 | * @iova: iova to be unmapped |
295 | * @size: size of the area | |
296 | * Returns integer: success (0) or error (< 0) | |
25da258f JW |
297 | * @get_vq_dma_dev: Get the dma device for a specific |
298 | * virtqueue (optional) | |
299 | * @vdev: vdpa device | |
300 | * @idx: virtqueue index | |
301 | * Returns pointer to structure device or error (NULL) | |
961e9c84 JW |
302 | * @free: Free resources that belongs to vDPA (optional) |
303 | * @vdev: vdpa device | |
304 | */ | |
305 | struct vdpa_config_ops { | |
306 | /* Virtqueue ops */ | |
307 | int (*set_vq_address)(struct vdpa_device *vdev, | |
308 | u16 idx, u64 desc_area, u64 driver_area, | |
309 | u64 device_area); | |
310 | void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num); | |
311 | void (*kick_vq)(struct vdpa_device *vdev, u16 idx); | |
312 | void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx, | |
313 | struct vdpa_callback *cb); | |
314 | void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready); | |
315 | bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx); | |
aac50c0b EC |
316 | int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, |
317 | const struct vdpa_vq_state *state); | |
23750e39 EC |
318 | int (*get_vq_state)(struct vdpa_device *vdev, u16 idx, |
319 | struct vdpa_vq_state *state); | |
13b00b13 EC |
320 | int (*get_vendor_vq_stats)(struct vdpa_device *vdev, u16 idx, |
321 | struct sk_buff *msg, | |
322 | struct netlink_ext_ack *extack); | |
c25a26e6 JW |
323 | struct vdpa_notification_area |
324 | (*get_vq_notification)(struct vdpa_device *vdev, u16 idx); | |
4c05433b | 325 | /* vq irq is not expected to be changed once DRIVER_OK is set */ |
d0ae1fbf | 326 | int (*get_vq_irq)(struct vdpa_device *vdev, u16 idx); |
961e9c84 JW |
327 | |
328 | /* Device ops */ | |
425a5070 | 329 | u32 (*get_vq_align)(struct vdpa_device *vdev); |
d4821902 | 330 | u32 (*get_vq_group)(struct vdpa_device *vdev, u16 idx); |
a64917bc EC |
331 | u64 (*get_device_features)(struct vdpa_device *vdev); |
332 | int (*set_driver_features)(struct vdpa_device *vdev, u64 features); | |
333 | u64 (*get_driver_features)(struct vdpa_device *vdev); | |
961e9c84 JW |
334 | void (*set_config_cb)(struct vdpa_device *vdev, |
335 | struct vdpa_callback *cb); | |
336 | u16 (*get_vq_num_max)(struct vdpa_device *vdev); | |
3b970a58 | 337 | u16 (*get_vq_num_min)(struct vdpa_device *vdev); |
961e9c84 JW |
338 | u32 (*get_device_id)(struct vdpa_device *vdev); |
339 | u32 (*get_vendor_id)(struct vdpa_device *vdev); | |
340 | u8 (*get_status)(struct vdpa_device *vdev); | |
341 | void (*set_status)(struct vdpa_device *vdev, u8 status); | |
0686082d | 342 | int (*reset)(struct vdpa_device *vdev); |
848ecea1 | 343 | int (*suspend)(struct vdpa_device *vdev); |
1538a8a4 | 344 | int (*resume)(struct vdpa_device *vdev); |
442706f9 | 345 | size_t (*get_config_size)(struct vdpa_device *vdev); |
961e9c84 JW |
346 | void (*get_config)(struct vdpa_device *vdev, unsigned int offset, |
347 | void *buf, unsigned int len); | |
348 | void (*set_config)(struct vdpa_device *vdev, unsigned int offset, | |
349 | const void *buf, unsigned int len); | |
350 | u32 (*get_generation)(struct vdpa_device *vdev); | |
3f1b623a | 351 | struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev); |
1d246927 XY |
352 | int (*set_vq_affinity)(struct vdpa_device *vdev, u16 idx, |
353 | const struct cpumask *cpu_mask); | |
354 | const struct cpumask *(*get_vq_affinity)(struct vdpa_device *vdev, | |
355 | u16 idx); | |
961e9c84 JW |
356 | |
357 | /* DMA ops */ | |
db9adcbf GD |
358 | int (*set_map)(struct vdpa_device *vdev, unsigned int asid, |
359 | struct vhost_iotlb *iotlb); | |
360 | int (*dma_map)(struct vdpa_device *vdev, unsigned int asid, | |
361 | u64 iova, u64 size, u64 pa, u32 perm, void *opaque); | |
362 | int (*dma_unmap)(struct vdpa_device *vdev, unsigned int asid, | |
363 | u64 iova, u64 size); | |
46d554b1 GD |
364 | int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group, |
365 | unsigned int asid); | |
25da258f | 366 | struct device *(*get_vq_dma_dev)(struct vdpa_device *vdev, u16 idx); |
961e9c84 JW |
367 | |
368 | /* Free device resources */ | |
369 | void (*free)(struct vdpa_device *vdev); | |
370 | }; | |
371 | ||
372 | struct vdpa_device *__vdpa_alloc_device(struct device *parent, | |
373 | const struct vdpa_config_ops *config, | |
db9adcbf | 374 | unsigned int ngroups, unsigned int nas, |
d8945ec4 XY |
375 | size_t size, const char *name, |
376 | bool use_va); | |
961e9c84 | 377 | |
c8d182bd XY |
378 | /** |
379 | * vdpa_alloc_device - allocate and initilaize a vDPA device | |
380 | * | |
381 | * @dev_struct: the type of the parent structure | |
382 | * @member: the name of struct vdpa_device within the @dev_struct | |
383 | * @parent: the parent device | |
384 | * @config: the bus operations that is supported by this device | |
d4821902 | 385 | * @ngroups: the number of virtqueue groups supported by this device |
db9adcbf | 386 | * @nas: the number of address spaces |
c8d182bd | 387 | * @name: name of the vdpa device |
d8945ec4 | 388 | * @use_va: indicate whether virtual address must be used by this device |
c8d182bd XY |
389 | * |
390 | * Return allocated data structure or ERR_PTR upon error | |
391 | */ | |
db9adcbf GD |
392 | #define vdpa_alloc_device(dev_struct, member, parent, config, ngroups, nas, \ |
393 | name, use_va) \ | |
d4821902 | 394 | container_of((__vdpa_alloc_device( \ |
db9adcbf GD |
395 | parent, config, ngroups, nas, \ |
396 | (sizeof(dev_struct) + \ | |
961e9c84 | 397 | BUILD_BUG_ON_ZERO(offsetof( \ |
db9adcbf | 398 | dev_struct, member))), name, use_va)), \ |
961e9c84 JW |
399 | dev_struct, member) |
400 | ||
81d46d69 | 401 | int vdpa_register_device(struct vdpa_device *vdev, u32 nvqs); |
961e9c84 JW |
402 | void vdpa_unregister_device(struct vdpa_device *vdev); |
403 | ||
81d46d69 | 404 | int _vdpa_register_device(struct vdpa_device *vdev, u32 nvqs); |
903f7bca PP |
405 | void _vdpa_unregister_device(struct vdpa_device *vdev); |
406 | ||
961e9c84 | 407 | /** |
d0f9164e | 408 | * struct vdpa_driver - operations for a vDPA driver |
961e9c84 JW |
409 | * @driver: underlying device driver |
410 | * @probe: the function to call when a device is found. Returns 0 or -errno. | |
411 | * @remove: the function to call when a device is removed. | |
412 | */ | |
413 | struct vdpa_driver { | |
414 | struct device_driver driver; | |
415 | int (*probe)(struct vdpa_device *vdev); | |
416 | void (*remove)(struct vdpa_device *vdev); | |
417 | }; | |
418 | ||
419 | #define vdpa_register_driver(drv) \ | |
420 | __vdpa_register_driver(drv, THIS_MODULE) | |
421 | int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner); | |
422 | void vdpa_unregister_driver(struct vdpa_driver *drv); | |
423 | ||
424 | #define module_vdpa_driver(__vdpa_driver) \ | |
425 | module_driver(__vdpa_driver, vdpa_register_driver, \ | |
426 | vdpa_unregister_driver) | |
427 | ||
428 | static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver) | |
429 | { | |
430 | return container_of(driver, struct vdpa_driver, driver); | |
431 | } | |
432 | ||
433 | static inline struct vdpa_device *dev_to_vdpa(struct device *_dev) | |
434 | { | |
435 | return container_of(_dev, struct vdpa_device, dev); | |
436 | } | |
437 | ||
438 | static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev) | |
439 | { | |
440 | return dev_get_drvdata(&vdev->dev); | |
441 | } | |
442 | ||
443 | static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data) | |
444 | { | |
445 | dev_set_drvdata(&vdev->dev, data); | |
446 | } | |
447 | ||
448 | static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) | |
449 | { | |
450 | return vdev->dma_dev; | |
451 | } | |
452639a6 | 452 | |
0686082d | 453 | static inline int vdpa_reset(struct vdpa_device *vdev) |
452639a6 | 454 | { |
86e17a51 | 455 | const struct vdpa_config_ops *ops = vdev->config; |
aba21aff | 456 | int ret; |
452639a6 | 457 | |
a6a51adc | 458 | down_write(&vdev->cf_lock); |
452639a6 | 459 | vdev->features_valid = false; |
aba21aff | 460 | ret = ops->reset(vdev); |
a6a51adc | 461 | up_write(&vdev->cf_lock); |
aba21aff | 462 | return ret; |
452639a6 MT |
463 | } |
464 | ||
e0077cc1 | 465 | static inline int vdpa_set_features_unlocked(struct vdpa_device *vdev, u64 features) |
452639a6 | 466 | { |
86e17a51 | 467 | const struct vdpa_config_ops *ops = vdev->config; |
aba21aff EC |
468 | int ret; |
469 | ||
452639a6 | 470 | vdev->features_valid = true; |
aba21aff | 471 | ret = ops->set_driver_features(vdev, features); |
e0077cc1 SWL |
472 | |
473 | return ret; | |
474 | } | |
475 | ||
476 | static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) | |
477 | { | |
478 | int ret; | |
479 | ||
a6a51adc | 480 | down_write(&vdev->cf_lock); |
e0077cc1 | 481 | ret = vdpa_set_features_unlocked(vdev, features); |
a6a51adc | 482 | up_write(&vdev->cf_lock); |
aba21aff EC |
483 | |
484 | return ret; | |
452639a6 MT |
485 | } |
486 | ||
6dbb1f16 PP |
487 | void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, |
488 | void *buf, unsigned int len); | |
489 | void vdpa_set_config(struct vdpa_device *dev, unsigned int offset, | |
490 | const void *buf, unsigned int length); | |
73bc0dbb EC |
491 | void vdpa_set_status(struct vdpa_device *vdev, u8 status); |
492 | ||
33b34750 | 493 | /** |
d0f9164e PP |
494 | * struct vdpa_mgmtdev_ops - vdpa device ops |
495 | * @dev_add: Add a vdpa device using alloc and register | |
496 | * @mdev: parent device to use for device addition | |
497 | * @name: name of the new vdpa device | |
d8ca2fa5 | 498 | * @config: config attributes to apply to the device under creation |
d0f9164e PP |
499 | * Driver need to add a new device using _vdpa_register_device() |
500 | * after fully initializing the vdpa device. Driver must return 0 | |
501 | * on success or appropriate error code. | |
502 | * @dev_del: Remove a vdpa device using unregister | |
503 | * @mdev: parent device to use for device removal | |
504 | * @dev: vdpa device to remove | |
505 | * Driver need to remove the specified device by calling | |
506 | * _vdpa_unregister_device(). | |
33b34750 PP |
507 | */ |
508 | struct vdpa_mgmtdev_ops { | |
d8ca2fa5 PP |
509 | int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name, |
510 | const struct vdpa_dev_set_config *config); | |
33b34750 PP |
511 | void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev); |
512 | }; | |
513 | ||
960deb33 PP |
514 | /** |
515 | * struct vdpa_mgmt_dev - vdpa management device | |
516 | * @device: Management parent device | |
517 | * @ops: operations supported by management device | |
518 | * @id_table: Pointer to device id table of supported ids | |
d8ca2fa5 PP |
519 | * @config_attr_mask: bit mask of attributes of type enum vdpa_attr that |
520 | * management device support during dev_add callback | |
960deb33 PP |
521 | * @list: list entry |
522 | */ | |
33b34750 PP |
523 | struct vdpa_mgmt_dev { |
524 | struct device *device; | |
525 | const struct vdpa_mgmtdev_ops *ops; | |
ffbda8e9 | 526 | struct virtio_device_id *id_table; |
d8ca2fa5 | 527 | u64 config_attr_mask; |
33b34750 | 528 | struct list_head list; |
cd2629f6 EC |
529 | u64 supported_features; |
530 | u32 max_supported_vqs; | |
33b34750 PP |
531 | }; |
532 | ||
533 | int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev); | |
534 | void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev); | |
535 | ||
961e9c84 | 536 | #endif /* _LINUX_VDPA_H */ |