1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vDPA bridge driver for modern virtio-pci device
4 *
5 * Copyright (c) 2020, Red Hat Inc. All rights reserved.
6 * Author: Jason Wang <jasowang@redhat.com>
7 *
8 * Based on virtio_pci_modern.c.
9 */
10
11 #include <linux/interrupt.h>
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/vdpa.h>
15 #include <linux/virtio.h>
16 #include <linux/virtio_config.h>
17 #include <linux/virtio_ring.h>
18 #include <linux/virtio_pci.h>
19 #include <linux/virtio_pci_modern.h>
20 #include <uapi/linux/vdpa.h>
21
22 #define VP_VDPA_QUEUE_MAX 256
23 #define VP_VDPA_DRIVER_NAME "vp_vdpa"
24 #define VP_VDPA_NAME_SIZE 256
25
26 struct vp_vring {
27 void __iomem *notify;
28 char msix_name[VP_VDPA_NAME_SIZE];
29 struct vdpa_callback cb;
30 resource_size_t notify_pa;
31 int irq;
32 };
33
34 struct vp_vdpa {
35 struct vdpa_device vdpa;
36 struct virtio_pci_modern_device *mdev;
37 struct vp_vring *vring;
38 struct vdpa_callback config_cb;
39 u64 device_features;
40 char msix_name[VP_VDPA_NAME_SIZE];
41 int config_irq;
42 int queues;
43 int vectors;
44 };
45
46 struct vp_vdpa_mgmtdev {
47 struct vdpa_mgmt_dev mgtdev;
48 struct virtio_pci_modern_device *mdev;
49 struct vp_vdpa *vp_vdpa;
50 };
51
vdpa_to_vp(struct vdpa_device * vdpa)52 static struct vp_vdpa *vdpa_to_vp(struct vdpa_device *vdpa)
53 {
54 return container_of(vdpa, struct vp_vdpa, vdpa);
55 }
56
vdpa_to_mdev(struct vdpa_device * vdpa)57 static struct virtio_pci_modern_device *vdpa_to_mdev(struct vdpa_device *vdpa)
58 {
59 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
60
61 return vp_vdpa->mdev;
62 }
63
vp_vdpa_to_mdev(struct vp_vdpa * vp_vdpa)64 static struct virtio_pci_modern_device *vp_vdpa_to_mdev(struct vp_vdpa *vp_vdpa)
65 {
66 return vp_vdpa->mdev;
67 }
68
vp_vdpa_get_device_features(struct vdpa_device * vdpa)69 static u64 vp_vdpa_get_device_features(struct vdpa_device *vdpa)
70 {
71 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
72
73 return vp_vdpa->device_features;
74 }
75
vp_vdpa_set_driver_features(struct vdpa_device * vdpa,u64 features)76 static int vp_vdpa_set_driver_features(struct vdpa_device *vdpa, u64 features)
77 {
78 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
79
80 vp_modern_set_features(mdev, features);
81
82 return 0;
83 }
84
vp_vdpa_get_driver_features(struct vdpa_device * vdpa)85 static u64 vp_vdpa_get_driver_features(struct vdpa_device *vdpa)
86 {
87 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
88
89 return vp_modern_get_driver_features(mdev);
90 }
91
vp_vdpa_get_status(struct vdpa_device * vdpa)92 static u8 vp_vdpa_get_status(struct vdpa_device *vdpa)
93 {
94 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
95
96 return vp_modern_get_status(mdev);
97 }
98
vp_vdpa_get_vq_irq(struct vdpa_device * vdpa,u16 idx)99 static int vp_vdpa_get_vq_irq(struct vdpa_device *vdpa, u16 idx)
100 {
101 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
102 int irq = vp_vdpa->vring[idx].irq;
103
104 if (irq == VIRTIO_MSI_NO_VECTOR)
105 return -EINVAL;
106
107 return irq;
108 }
109
vp_vdpa_free_irq(struct vp_vdpa * vp_vdpa)110 static void vp_vdpa_free_irq(struct vp_vdpa *vp_vdpa)
111 {
112 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
113 struct pci_dev *pdev = mdev->pci_dev;
114 int i;
115
116 for (i = 0; i < vp_vdpa->queues; i++) {
117 if (vp_vdpa->vring[i].irq != VIRTIO_MSI_NO_VECTOR) {
118 vp_modern_queue_vector(mdev, i, VIRTIO_MSI_NO_VECTOR);
119 devm_free_irq(&pdev->dev, vp_vdpa->vring[i].irq,
120 &vp_vdpa->vring[i]);
121 vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
122 }
123 }
124
125 if (vp_vdpa->config_irq != VIRTIO_MSI_NO_VECTOR) {
126 vp_modern_config_vector(mdev, VIRTIO_MSI_NO_VECTOR);
127 devm_free_irq(&pdev->dev, vp_vdpa->config_irq, vp_vdpa);
128 vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
129 }
130
131 if (vp_vdpa->vectors) {
132 pci_free_irq_vectors(pdev);
133 vp_vdpa->vectors = 0;
134 }
135 }
136
vp_vdpa_vq_handler(int irq,void * arg)137 static irqreturn_t vp_vdpa_vq_handler(int irq, void *arg)
138 {
139 struct vp_vring *vring = arg;
140
141 if (vring->cb.callback)
142 return vring->cb.callback(vring->cb.private);
143
144 return IRQ_HANDLED;
145 }
146
vp_vdpa_config_handler(int irq,void * arg)147 static irqreturn_t vp_vdpa_config_handler(int irq, void *arg)
148 {
149 struct vp_vdpa *vp_vdpa = arg;
150
151 if (vp_vdpa->config_cb.callback)
152 return vp_vdpa->config_cb.callback(vp_vdpa->config_cb.private);
153
154 return IRQ_HANDLED;
155 }
156
vp_vdpa_request_irq(struct vp_vdpa * vp_vdpa)157 static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa)
158 {
159 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
160 struct pci_dev *pdev = mdev->pci_dev;
161 int i, ret, irq;
162 int queues = vp_vdpa->queues;
163 int vectors = queues + 1;
164
165 ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX);
166 if (ret != vectors) {
167 dev_err(&pdev->dev,
168 "vp_vdpa: fail to allocate irq vectors want %d but %d\n",
169 vectors, ret);
170 return ret;
171 }
172
173 vp_vdpa->vectors = vectors;
174
175 for (i = 0; i < queues; i++) {
176 snprintf(vp_vdpa->vring[i].msix_name, VP_VDPA_NAME_SIZE,
177 "vp-vdpa[%s]-%d\n", pci_name(pdev), i);
178 irq = pci_irq_vector(pdev, i);
179 ret = devm_request_irq(&pdev->dev, irq,
180 vp_vdpa_vq_handler,
181 0, vp_vdpa->vring[i].msix_name,
182 &vp_vdpa->vring[i]);
183 if (ret) {
184 dev_err(&pdev->dev,
185 "vp_vdpa: fail to request irq for vq %d\n", i);
186 goto err;
187 }
188 vp_modern_queue_vector(mdev, i, i);
189 vp_vdpa->vring[i].irq = irq;
190 }
191
192 snprintf(vp_vdpa->msix_name, VP_VDPA_NAME_SIZE, "vp-vdpa[%s]-config\n",
193 pci_name(pdev));
194 irq = pci_irq_vector(pdev, queues);
195 ret = devm_request_irq(&pdev->dev, irq, vp_vdpa_config_handler, 0,
196 vp_vdpa->msix_name, vp_vdpa);
197 if (ret) {
198 dev_err(&pdev->dev,
199 "vp_vdpa: fail to request irq for vq %d\n", i);
200 goto err;
201 }
202 vp_modern_config_vector(mdev, queues);
203 vp_vdpa->config_irq = irq;
204
205 return 0;
206 err:
207 vp_vdpa_free_irq(vp_vdpa);
208 return ret;
209 }
210
vp_vdpa_set_status(struct vdpa_device * vdpa,u8 status)211 static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
212 {
213 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
214 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
215 u8 s = vp_vdpa_get_status(vdpa);
216
217 if (status & VIRTIO_CONFIG_S_DRIVER_OK &&
218 !(s & VIRTIO_CONFIG_S_DRIVER_OK)) {
219 vp_vdpa_request_irq(vp_vdpa);
220 }
221
222 vp_modern_set_status(mdev, status);
223 }
224
vp_vdpa_reset(struct vdpa_device * vdpa)225 static int vp_vdpa_reset(struct vdpa_device *vdpa)
226 {
227 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
228 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
229 u8 s = vp_vdpa_get_status(vdpa);
230
231 vp_modern_set_status(mdev, 0);
232
233 if (s & VIRTIO_CONFIG_S_DRIVER_OK)
234 vp_vdpa_free_irq(vp_vdpa);
235
236 return 0;
237 }
238
vp_vdpa_get_vq_num_max(struct vdpa_device * vdpa)239 static u16 vp_vdpa_get_vq_num_max(struct vdpa_device *vdpa)
240 {
241 return VP_VDPA_QUEUE_MAX;
242 }
243
vp_vdpa_get_vq_state(struct vdpa_device * vdpa,u16 qid,struct vdpa_vq_state * state)244 static int vp_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 qid,
245 struct vdpa_vq_state *state)
246 {
247 /* Note that this is not supported by virtio specification, so
248 * we return -EOPNOTSUPP here. This means we can't support live
249 * migration, vhost device start/stop.
250 */
251 return -EOPNOTSUPP;
252 }
253
vp_vdpa_set_vq_state_split(struct vdpa_device * vdpa,const struct vdpa_vq_state * state)254 static int vp_vdpa_set_vq_state_split(struct vdpa_device *vdpa,
255 const struct vdpa_vq_state *state)
256 {
257 const struct vdpa_vq_state_split *split = &state->split;
258
259 if (split->avail_index == 0)
260 return 0;
261
262 return -EOPNOTSUPP;
263 }
264
vp_vdpa_set_vq_state_packed(struct vdpa_device * vdpa,const struct vdpa_vq_state * state)265 static int vp_vdpa_set_vq_state_packed(struct vdpa_device *vdpa,
266 const struct vdpa_vq_state *state)
267 {
268 const struct vdpa_vq_state_packed *packed = &state->packed;
269
270 if (packed->last_avail_counter == 1 &&
271 packed->last_avail_idx == 0 &&
272 packed->last_used_counter == 1 &&
273 packed->last_used_idx == 0)
274 return 0;
275
276 return -EOPNOTSUPP;
277 }
278
vp_vdpa_set_vq_state(struct vdpa_device * vdpa,u16 qid,const struct vdpa_vq_state * state)279 static int vp_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 qid,
280 const struct vdpa_vq_state *state)
281 {
282 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
283
284 /* Note that this is not supported by virtio specification.
285 * But if the state is by chance equal to the device initial
286 * state, we can let it go.
287 */
288 if ((vp_modern_get_status(mdev) & VIRTIO_CONFIG_S_FEATURES_OK) &&
289 !vp_modern_get_queue_enable(mdev, qid)) {
290 if (vp_modern_get_driver_features(mdev) &
291 BIT_ULL(VIRTIO_F_RING_PACKED))
292 return vp_vdpa_set_vq_state_packed(vdpa, state);
293 else
294 return vp_vdpa_set_vq_state_split(vdpa, state);
295 }
296
297 return -EOPNOTSUPP;
298 }
299
vp_vdpa_set_vq_cb(struct vdpa_device * vdpa,u16 qid,struct vdpa_callback * cb)300 static void vp_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 qid,
301 struct vdpa_callback *cb)
302 {
303 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
304
305 vp_vdpa->vring[qid].cb = *cb;
306 }
307
vp_vdpa_set_vq_ready(struct vdpa_device * vdpa,u16 qid,bool ready)308 static void vp_vdpa_set_vq_ready(struct vdpa_device *vdpa,
309 u16 qid, bool ready)
310 {
311 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
312
313 vp_modern_set_queue_enable(mdev, qid, ready);
314 }
315
vp_vdpa_get_vq_ready(struct vdpa_device * vdpa,u16 qid)316 static bool vp_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 qid)
317 {
318 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
319
320 return vp_modern_get_queue_enable(mdev, qid);
321 }
322
vp_vdpa_set_vq_num(struct vdpa_device * vdpa,u16 qid,u32 num)323 static void vp_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 qid,
324 u32 num)
325 {
326 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
327
328 vp_modern_set_queue_size(mdev, qid, num);
329 }
330
vp_vdpa_set_vq_address(struct vdpa_device * vdpa,u16 qid,u64 desc_area,u64 driver_area,u64 device_area)331 static int vp_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 qid,
332 u64 desc_area, u64 driver_area,
333 u64 device_area)
334 {
335 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
336
337 vp_modern_queue_address(mdev, qid, desc_area,
338 driver_area, device_area);
339
340 return 0;
341 }
342
vp_vdpa_kick_vq(struct vdpa_device * vdpa,u16 qid)343 static void vp_vdpa_kick_vq(struct vdpa_device *vdpa, u16 qid)
344 {
345 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
346
347 vp_iowrite16(qid, vp_vdpa->vring[qid].notify);
348 }
349
vp_vdpa_get_generation(struct vdpa_device * vdpa)350 static u32 vp_vdpa_get_generation(struct vdpa_device *vdpa)
351 {
352 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
353
354 return vp_modern_generation(mdev);
355 }
356
vp_vdpa_get_device_id(struct vdpa_device * vdpa)357 static u32 vp_vdpa_get_device_id(struct vdpa_device *vdpa)
358 {
359 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
360
361 return mdev->id.device;
362 }
363
vp_vdpa_get_vendor_id(struct vdpa_device * vdpa)364 static u32 vp_vdpa_get_vendor_id(struct vdpa_device *vdpa)
365 {
366 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
367
368 return mdev->id.vendor;
369 }
370
vp_vdpa_get_vq_align(struct vdpa_device * vdpa)371 static u32 vp_vdpa_get_vq_align(struct vdpa_device *vdpa)
372 {
373 return PAGE_SIZE;
374 }
375
vp_vdpa_get_config_size(struct vdpa_device * vdpa)376 static size_t vp_vdpa_get_config_size(struct vdpa_device *vdpa)
377 {
378 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
379
380 return mdev->device_len;
381 }
382
vp_vdpa_get_config(struct vdpa_device * vdpa,unsigned int offset,void * buf,unsigned int len)383 static void vp_vdpa_get_config(struct vdpa_device *vdpa,
384 unsigned int offset,
385 void *buf, unsigned int len)
386 {
387 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
388 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
389 u8 old, new;
390 u8 *p;
391 int i;
392
393 do {
394 old = vp_ioread8(&mdev->common->config_generation);
395 p = buf;
396 for (i = 0; i < len; i++)
397 *p++ = vp_ioread8(mdev->device + offset + i);
398
399 new = vp_ioread8(&mdev->common->config_generation);
400 } while (old != new);
401 }
402
vp_vdpa_set_config(struct vdpa_device * vdpa,unsigned int offset,const void * buf,unsigned int len)403 static void vp_vdpa_set_config(struct vdpa_device *vdpa,
404 unsigned int offset, const void *buf,
405 unsigned int len)
406 {
407 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
408 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
409 const u8 *p = buf;
410 int i;
411
412 for (i = 0; i < len; i++)
413 vp_iowrite8(*p++, mdev->device + offset + i);
414 }
415
vp_vdpa_set_config_cb(struct vdpa_device * vdpa,struct vdpa_callback * cb)416 static void vp_vdpa_set_config_cb(struct vdpa_device *vdpa,
417 struct vdpa_callback *cb)
418 {
419 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
420
421 vp_vdpa->config_cb = *cb;
422 }
423
424 static struct vdpa_notification_area
vp_vdpa_get_vq_notification(struct vdpa_device * vdpa,u16 qid)425 vp_vdpa_get_vq_notification(struct vdpa_device *vdpa, u16 qid)
426 {
427 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
428 struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
429 struct vdpa_notification_area notify;
430
431 notify.addr = vp_vdpa->vring[qid].notify_pa;
432 notify.size = mdev->notify_offset_multiplier;
433
434 return notify;
435 }
436
437 static const struct vdpa_config_ops vp_vdpa_ops = {
438 .get_device_features = vp_vdpa_get_device_features,
439 .set_driver_features = vp_vdpa_set_driver_features,
440 .get_driver_features = vp_vdpa_get_driver_features,
441 .get_status = vp_vdpa_get_status,
442 .set_status = vp_vdpa_set_status,
443 .reset = vp_vdpa_reset,
444 .get_vq_num_max = vp_vdpa_get_vq_num_max,
445 .get_vq_state = vp_vdpa_get_vq_state,
446 .get_vq_notification = vp_vdpa_get_vq_notification,
447 .set_vq_state = vp_vdpa_set_vq_state,
448 .set_vq_cb = vp_vdpa_set_vq_cb,
449 .set_vq_ready = vp_vdpa_set_vq_ready,
450 .get_vq_ready = vp_vdpa_get_vq_ready,
451 .set_vq_num = vp_vdpa_set_vq_num,
452 .set_vq_address = vp_vdpa_set_vq_address,
453 .kick_vq = vp_vdpa_kick_vq,
454 .get_generation = vp_vdpa_get_generation,
455 .get_device_id = vp_vdpa_get_device_id,
456 .get_vendor_id = vp_vdpa_get_vendor_id,
457 .get_vq_align = vp_vdpa_get_vq_align,
458 .get_config_size = vp_vdpa_get_config_size,
459 .get_config = vp_vdpa_get_config,
460 .set_config = vp_vdpa_set_config,
461 .set_config_cb = vp_vdpa_set_config_cb,
462 .get_vq_irq = vp_vdpa_get_vq_irq,
463 };
464
vp_vdpa_free_irq_vectors(void * data)465 static void vp_vdpa_free_irq_vectors(void *data)
466 {
467 pci_free_irq_vectors(data);
468 }
469
vp_vdpa_dev_add(struct vdpa_mgmt_dev * v_mdev,const char * name,const struct vdpa_dev_set_config * add_config)470 static int vp_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
471 const struct vdpa_dev_set_config *add_config)
472 {
473 struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev =
474 container_of(v_mdev, struct vp_vdpa_mgmtdev, mgtdev);
475
476 struct virtio_pci_modern_device *mdev = vp_vdpa_mgtdev->mdev;
477 struct pci_dev *pdev = mdev->pci_dev;
478 struct device *dev = &pdev->dev;
479 struct vp_vdpa *vp_vdpa = NULL;
480 u64 device_features;
481 int ret, i;
482
483 vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa,
484 dev, &vp_vdpa_ops, 1, 1, name, false);
485
486 if (IS_ERR(vp_vdpa)) {
487 dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n");
488 return PTR_ERR(vp_vdpa);
489 }
490
491 vp_vdpa_mgtdev->vp_vdpa = vp_vdpa;
492
493 vp_vdpa->vdpa.dma_dev = &pdev->dev;
494 vp_vdpa->queues = vp_modern_get_num_queues(mdev);
495 vp_vdpa->mdev = mdev;
496
497 device_features = vp_modern_get_features(mdev);
498 if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
499 if (add_config->device_features & ~device_features) {
500 ret = -EINVAL;
501 dev_err(&pdev->dev, "Try to provision features "
502 "that are not supported by the device: "
503 "device_features 0x%llx provisioned 0x%llx\n",
504 device_features, add_config->device_features);
505 goto err;
506 }
507 device_features = add_config->device_features;
508 }
509 vp_vdpa->device_features = device_features;
510
511 ret = devm_add_action_or_reset(dev, vp_vdpa_free_irq_vectors, pdev);
512 if (ret) {
513 dev_err(&pdev->dev,
514 "Failed for adding devres for freeing irq vectors\n");
515 goto err;
516 }
517
518 vp_vdpa->vring = devm_kcalloc(&pdev->dev, vp_vdpa->queues,
519 sizeof(*vp_vdpa->vring),
520 GFP_KERNEL);
521 if (!vp_vdpa->vring) {
522 ret = -ENOMEM;
523 dev_err(&pdev->dev, "Fail to allocate virtqueues\n");
524 goto err;
525 }
526
527 for (i = 0; i < vp_vdpa->queues; i++) {
528 vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
529 vp_vdpa->vring[i].notify =
530 vp_modern_map_vq_notify(mdev, i,
531 &vp_vdpa->vring[i].notify_pa);
532 if (!vp_vdpa->vring[i].notify) {
533 ret = -EINVAL;
534 dev_warn(&pdev->dev, "Fail to map vq notify %d\n", i);
535 goto err;
536 }
537 }
538 vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
539
540 vp_vdpa->vdpa.mdev = &vp_vdpa_mgtdev->mgtdev;
541 ret = _vdpa_register_device(&vp_vdpa->vdpa, vp_vdpa->queues);
542 if (ret) {
543 dev_err(&pdev->dev, "Failed to register to vdpa bus\n");
544 goto err;
545 }
546
547 return 0;
548
549 err:
550 put_device(&vp_vdpa->vdpa.dev);
551 return ret;
552 }
553
vp_vdpa_dev_del(struct vdpa_mgmt_dev * v_mdev,struct vdpa_device * dev)554 static void vp_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev,
555 struct vdpa_device *dev)
556 {
557 struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev =
558 container_of(v_mdev, struct vp_vdpa_mgmtdev, mgtdev);
559
560 struct vp_vdpa *vp_vdpa = vp_vdpa_mgtdev->vp_vdpa;
561
562 _vdpa_unregister_device(&vp_vdpa->vdpa);
563 vp_vdpa_mgtdev->vp_vdpa = NULL;
564 }
565
566 static const struct vdpa_mgmtdev_ops vp_vdpa_mdev_ops = {
567 .dev_add = vp_vdpa_dev_add,
568 .dev_del = vp_vdpa_dev_del,
569 };
570
vp_vdpa_probe(struct pci_dev * pdev,const struct pci_device_id * id)571 static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
572 {
573 struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev = NULL;
574 struct vdpa_mgmt_dev *mgtdev;
575 struct device *dev = &pdev->dev;
576 struct virtio_pci_modern_device *mdev = NULL;
577 struct virtio_device_id *mdev_id = NULL;
578 int err;
579
580 vp_vdpa_mgtdev = kzalloc(sizeof(*vp_vdpa_mgtdev), GFP_KERNEL);
581 if (!vp_vdpa_mgtdev)
582 return -ENOMEM;
583
584 mgtdev = &vp_vdpa_mgtdev->mgtdev;
585 mgtdev->ops = &vp_vdpa_mdev_ops;
586 mgtdev->device = dev;
587
588 mdev = kzalloc(sizeof(struct virtio_pci_modern_device), GFP_KERNEL);
589 if (!mdev) {
590 err = -ENOMEM;
591 goto mdev_err;
592 }
593
594 mdev_id = kzalloc(sizeof(struct virtio_device_id), GFP_KERNEL);
595 if (!mdev_id) {
596 err = -ENOMEM;
597 goto mdev_id_err;
598 }
599
600 vp_vdpa_mgtdev->mdev = mdev;
601 mdev->pci_dev = pdev;
602
603 err = pcim_enable_device(pdev);
604 if (err) {
605 goto probe_err;
606 }
607
608 err = vp_modern_probe(mdev);
609 if (err) {
610 dev_err(&pdev->dev, "Failed to probe modern PCI device\n");
611 goto probe_err;
612 }
613
614 mdev_id->device = mdev->id.device;
615 mdev_id->vendor = mdev->id.vendor;
616 mgtdev->id_table = mdev_id;
617 mgtdev->max_supported_vqs = vp_modern_get_num_queues(mdev);
618 mgtdev->supported_features = vp_modern_get_features(mdev);
619 mgtdev->config_attr_mask = (1 << VDPA_ATTR_DEV_FEATURES);
620 pci_set_master(pdev);
621 pci_set_drvdata(pdev, vp_vdpa_mgtdev);
622
623 err = vdpa_mgmtdev_register(mgtdev);
624 if (err) {
625 dev_err(&pdev->dev, "Failed to register vdpa mgmtdev device\n");
626 goto register_err;
627 }
628
629 return 0;
630
631 register_err:
632 vp_modern_remove(vp_vdpa_mgtdev->mdev);
633 probe_err:
634 kfree(mdev_id);
635 mdev_id_err:
636 kfree(mdev);
637 mdev_err:
638 kfree(vp_vdpa_mgtdev);
639 return err;
640 }
641
vp_vdpa_remove(struct pci_dev * pdev)642 static void vp_vdpa_remove(struct pci_dev *pdev)
643 {
644 struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev = pci_get_drvdata(pdev);
645 struct virtio_pci_modern_device *mdev = NULL;
646
647 mdev = vp_vdpa_mgtdev->mdev;
648 vdpa_mgmtdev_unregister(&vp_vdpa_mgtdev->mgtdev);
649 vp_modern_remove(mdev);
650 kfree(vp_vdpa_mgtdev->mgtdev.id_table);
651 kfree(mdev);
652 kfree(vp_vdpa_mgtdev);
653 }
654
655 static struct pci_driver vp_vdpa_driver = {
656 .name = "vp-vdpa",
657 .id_table = NULL, /* only dynamic ids */
658 .probe = vp_vdpa_probe,
659 .remove = vp_vdpa_remove,
660 };
661
662 module_pci_driver(vp_vdpa_driver);
663
664 MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
665 MODULE_DESCRIPTION("vp-vdpa");
666 MODULE_LICENSE("GPL");
667 MODULE_VERSION("1");
668