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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
21#define VP_VDPA_QUEUE_MAX 256
22#define VP_VDPA_DRIVER_NAME "vp_vdpa"
23#define VP_VDPA_NAME_SIZE 256
24
25struct vp_vring {
26 void __iomem *notify;
27 char msix_name[VP_VDPA_NAME_SIZE];
28 struct vdpa_callback cb;
29 resource_size_t notify_pa;
30 int irq;
31};
32
33struct vp_vdpa {
34 struct vdpa_device vdpa;
35 struct virtio_pci_modern_device mdev;
36 struct vp_vring *vring;
37 struct vdpa_callback config_cb;
38 char msix_name[VP_VDPA_NAME_SIZE];
39 int config_irq;
40 int queues;
41 int vectors;
42};
43
44static struct vp_vdpa *vdpa_to_vp(struct vdpa_device *vdpa)
45{
46 return container_of(vdpa, struct vp_vdpa, vdpa);
47}
48
49static struct virtio_pci_modern_device *vdpa_to_mdev(struct vdpa_device *vdpa)
50{
51 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
52
53 return &vp_vdpa->mdev;
54}
55
56static u64 vp_vdpa_get_features(struct vdpa_device *vdpa)
57{
58 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
59
60 return vp_modern_get_features(mdev);
61}
62
63static int vp_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
64{
65 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
66
67 vp_modern_set_features(mdev, features);
68
69 return 0;
70}
71
72static u8 vp_vdpa_get_status(struct vdpa_device *vdpa)
73{
74 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
75
76 return vp_modern_get_status(mdev);
77}
78
79static void vp_vdpa_free_irq(struct vp_vdpa *vp_vdpa)
80{
81 struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
82 struct pci_dev *pdev = mdev->pci_dev;
83 int i;
84
85 for (i = 0; i < vp_vdpa->queues; i++) {
86 if (vp_vdpa->vring[i].irq != VIRTIO_MSI_NO_VECTOR) {
87 vp_modern_queue_vector(mdev, i, VIRTIO_MSI_NO_VECTOR);
88 devm_free_irq(&pdev->dev, vp_vdpa->vring[i].irq,
89 &vp_vdpa->vring[i]);
90 vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
91 }
92 }
93
94 if (vp_vdpa->config_irq != VIRTIO_MSI_NO_VECTOR) {
95 vp_modern_config_vector(mdev, VIRTIO_MSI_NO_VECTOR);
96 devm_free_irq(&pdev->dev, vp_vdpa->config_irq, vp_vdpa);
97 vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
98 }
99
100 if (vp_vdpa->vectors) {
101 pci_free_irq_vectors(pdev);
102 vp_vdpa->vectors = 0;
103 }
104}
105
106static irqreturn_t vp_vdpa_vq_handler(int irq, void *arg)
107{
108 struct vp_vring *vring = arg;
109
110 if (vring->cb.callback)
111 return vring->cb.callback(vring->cb.private);
112
113 return IRQ_HANDLED;
114}
115
116static irqreturn_t vp_vdpa_config_handler(int irq, void *arg)
117{
118 struct vp_vdpa *vp_vdpa = arg;
119
120 if (vp_vdpa->config_cb.callback)
121 return vp_vdpa->config_cb.callback(vp_vdpa->config_cb.private);
122
123 return IRQ_HANDLED;
124}
125
126static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa)
127{
128 struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
129 struct pci_dev *pdev = mdev->pci_dev;
130 int i, ret, irq;
131 int queues = vp_vdpa->queues;
132 int vectors = queues + 1;
133
134 ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX);
135 if (ret != vectors) {
136 dev_err(&pdev->dev,
137 "vp_vdpa: fail to allocate irq vectors want %d but %d\n",
138 vectors, ret);
139 return ret;
140 }
141
142 vp_vdpa->vectors = vectors;
143
144 for (i = 0; i < queues; i++) {
145 snprintf(vp_vdpa->vring[i].msix_name, VP_VDPA_NAME_SIZE,
146 "vp-vdpa[%s]-%d\n", pci_name(pdev), i);
147 irq = pci_irq_vector(pdev, i);
148 ret = devm_request_irq(&pdev->dev, irq,
149 vp_vdpa_vq_handler,
150 0, vp_vdpa->vring[i].msix_name,
151 &vp_vdpa->vring[i]);
152 if (ret) {
153 dev_err(&pdev->dev,
154 "vp_vdpa: fail to request irq for vq %d\n", i);
155 goto err;
156 }
157 vp_modern_queue_vector(mdev, i, i);
158 vp_vdpa->vring[i].irq = irq;
159 }
160
161 snprintf(vp_vdpa->msix_name, VP_VDPA_NAME_SIZE, "vp-vdpa[%s]-config\n",
162 pci_name(pdev));
163 irq = pci_irq_vector(pdev, queues);
164 ret = devm_request_irq(&pdev->dev, irq, vp_vdpa_config_handler, 0,
165 vp_vdpa->msix_name, vp_vdpa);
166 if (ret) {
167 dev_err(&pdev->dev,
168 "vp_vdpa: fail to request irq for vq %d\n", i);
169 goto err;
170 }
171 vp_modern_config_vector(mdev, queues);
172 vp_vdpa->config_irq = irq;
173
174 return 0;
175err:
176 vp_vdpa_free_irq(vp_vdpa);
177 return ret;
178}
179
180static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
181{
182 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
183 struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
184 u8 s = vp_vdpa_get_status(vdpa);
185
186 if (status & VIRTIO_CONFIG_S_DRIVER_OK &&
187 !(s & VIRTIO_CONFIG_S_DRIVER_OK)) {
188 vp_vdpa_request_irq(vp_vdpa);
189 }
190
191 vp_modern_set_status(mdev, status);
192
193 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK) &&
194 (s & VIRTIO_CONFIG_S_DRIVER_OK))
195 vp_vdpa_free_irq(vp_vdpa);
196}
197
198static u16 vp_vdpa_get_vq_num_max(struct vdpa_device *vdpa)
199{
200 return VP_VDPA_QUEUE_MAX;
201}
202
203static int vp_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 qid,
204 struct vdpa_vq_state *state)
205{
206
207
208
209
210 return -EOPNOTSUPP;
211}
212
213static int vp_vdpa_set_vq_state_split(struct vdpa_device *vdpa,
214 const struct vdpa_vq_state *state)
215{
216 const struct vdpa_vq_state_split *split = &state->split;
217
218 if (split->avail_index == 0)
219 return 0;
220
221 return -EOPNOTSUPP;
222}
223
224static int vp_vdpa_set_vq_state_packed(struct vdpa_device *vdpa,
225 const struct vdpa_vq_state *state)
226{
227 const struct vdpa_vq_state_packed *packed = &state->packed;
228
229 if (packed->last_avail_counter == 1 &&
230 packed->last_avail_idx == 0 &&
231 packed->last_used_counter == 1 &&
232 packed->last_used_idx == 0)
233 return 0;
234
235 return -EOPNOTSUPP;
236}
237
238static int vp_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 qid,
239 const struct vdpa_vq_state *state)
240{
241 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
242
243
244
245
246
247 if ((vp_modern_get_status(mdev) & VIRTIO_CONFIG_S_FEATURES_OK) &&
248 !vp_modern_get_queue_enable(mdev, qid)) {
249 if (vp_modern_get_driver_features(mdev) &
250 BIT_ULL(VIRTIO_F_RING_PACKED))
251 return vp_vdpa_set_vq_state_packed(vdpa, state);
252 else
253 return vp_vdpa_set_vq_state_split(vdpa, state);
254 }
255
256 return -EOPNOTSUPP;
257}
258
259static void vp_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 qid,
260 struct vdpa_callback *cb)
261{
262 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
263
264 vp_vdpa->vring[qid].cb = *cb;
265}
266
267static void vp_vdpa_set_vq_ready(struct vdpa_device *vdpa,
268 u16 qid, bool ready)
269{
270 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
271
272 vp_modern_set_queue_enable(mdev, qid, ready);
273}
274
275static bool vp_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 qid)
276{
277 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
278
279 return vp_modern_get_queue_enable(mdev, qid);
280}
281
282static void vp_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 qid,
283 u32 num)
284{
285 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
286
287 vp_modern_set_queue_size(mdev, qid, num);
288}
289
290static int vp_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 qid,
291 u64 desc_area, u64 driver_area,
292 u64 device_area)
293{
294 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
295
296 vp_modern_queue_address(mdev, qid, desc_area,
297 driver_area, device_area);
298
299 return 0;
300}
301
302static void vp_vdpa_kick_vq(struct vdpa_device *vdpa, u16 qid)
303{
304 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
305
306 vp_iowrite16(qid, vp_vdpa->vring[qid].notify);
307}
308
309static u32 vp_vdpa_get_generation(struct vdpa_device *vdpa)
310{
311 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
312
313 return vp_modern_generation(mdev);
314}
315
316static u32 vp_vdpa_get_device_id(struct vdpa_device *vdpa)
317{
318 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
319
320 return mdev->id.device;
321}
322
323static u32 vp_vdpa_get_vendor_id(struct vdpa_device *vdpa)
324{
325 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
326
327 return mdev->id.vendor;
328}
329
330static u32 vp_vdpa_get_vq_align(struct vdpa_device *vdpa)
331{
332 return PAGE_SIZE;
333}
334
335static size_t vp_vdpa_get_config_size(struct vdpa_device *vdpa)
336{
337 struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
338
339 return mdev->device_len;
340}
341
342static void vp_vdpa_get_config(struct vdpa_device *vdpa,
343 unsigned int offset,
344 void *buf, unsigned int len)
345{
346 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
347 struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
348 u8 old, new;
349 u8 *p;
350 int i;
351
352 do {
353 old = vp_ioread8(&mdev->common->config_generation);
354 p = buf;
355 for (i = 0; i < len; i++)
356 *p++ = vp_ioread8(mdev->device + offset + i);
357
358 new = vp_ioread8(&mdev->common->config_generation);
359 } while (old != new);
360}
361
362static void vp_vdpa_set_config(struct vdpa_device *vdpa,
363 unsigned int offset, const void *buf,
364 unsigned int len)
365{
366 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
367 struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
368 const u8 *p = buf;
369 int i;
370
371 for (i = 0; i < len; i++)
372 vp_iowrite8(*p++, mdev->device + offset + i);
373}
374
375static void vp_vdpa_set_config_cb(struct vdpa_device *vdpa,
376 struct vdpa_callback *cb)
377{
378 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
379
380 vp_vdpa->config_cb = *cb;
381}
382
383static struct vdpa_notification_area
384vp_vdpa_get_vq_notification(struct vdpa_device *vdpa, u16 qid)
385{
386 struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
387 struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
388 struct vdpa_notification_area notify;
389
390 notify.addr = vp_vdpa->vring[qid].notify_pa;
391 notify.size = mdev->notify_offset_multiplier;
392
393 return notify;
394}
395
396static const struct vdpa_config_ops vp_vdpa_ops = {
397 .get_features = vp_vdpa_get_features,
398 .set_features = vp_vdpa_set_features,
399 .get_status = vp_vdpa_get_status,
400 .set_status = vp_vdpa_set_status,
401 .get_vq_num_max = vp_vdpa_get_vq_num_max,
402 .get_vq_state = vp_vdpa_get_vq_state,
403 .get_vq_notification = vp_vdpa_get_vq_notification,
404 .set_vq_state = vp_vdpa_set_vq_state,
405 .set_vq_cb = vp_vdpa_set_vq_cb,
406 .set_vq_ready = vp_vdpa_set_vq_ready,
407 .get_vq_ready = vp_vdpa_get_vq_ready,
408 .set_vq_num = vp_vdpa_set_vq_num,
409 .set_vq_address = vp_vdpa_set_vq_address,
410 .kick_vq = vp_vdpa_kick_vq,
411 .get_generation = vp_vdpa_get_generation,
412 .get_device_id = vp_vdpa_get_device_id,
413 .get_vendor_id = vp_vdpa_get_vendor_id,
414 .get_vq_align = vp_vdpa_get_vq_align,
415 .get_config_size = vp_vdpa_get_config_size,
416 .get_config = vp_vdpa_get_config,
417 .set_config = vp_vdpa_set_config,
418 .set_config_cb = vp_vdpa_set_config_cb,
419};
420
421static void vp_vdpa_free_irq_vectors(void *data)
422{
423 pci_free_irq_vectors(data);
424}
425
426static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
427{
428 struct virtio_pci_modern_device *mdev;
429 struct device *dev = &pdev->dev;
430 struct vp_vdpa *vp_vdpa;
431 int ret, i;
432
433 ret = pcim_enable_device(pdev);
434 if (ret)
435 return ret;
436
437 vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa,
438 dev, &vp_vdpa_ops, NULL);
439 if (IS_ERR(vp_vdpa)) {
440 dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n");
441 return PTR_ERR(vp_vdpa);
442 }
443
444 mdev = &vp_vdpa->mdev;
445 mdev->pci_dev = pdev;
446
447 ret = vp_modern_probe(mdev);
448 if (ret) {
449 dev_err(&pdev->dev, "Failed to probe modern PCI device\n");
450 goto err;
451 }
452
453 pci_set_master(pdev);
454 pci_set_drvdata(pdev, vp_vdpa);
455
456 vp_vdpa->vdpa.dma_dev = &pdev->dev;
457 vp_vdpa->queues = vp_modern_get_num_queues(mdev);
458
459 ret = devm_add_action_or_reset(dev, vp_vdpa_free_irq_vectors, pdev);
460 if (ret) {
461 dev_err(&pdev->dev,
462 "Failed for adding devres for freeing irq vectors\n");
463 goto err;
464 }
465
466 vp_vdpa->vring = devm_kcalloc(&pdev->dev, vp_vdpa->queues,
467 sizeof(*vp_vdpa->vring),
468 GFP_KERNEL);
469 if (!vp_vdpa->vring) {
470 ret = -ENOMEM;
471 dev_err(&pdev->dev, "Fail to allocate virtqueues\n");
472 goto err;
473 }
474
475 for (i = 0; i < vp_vdpa->queues; i++) {
476 vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
477 vp_vdpa->vring[i].notify =
478 vp_modern_map_vq_notify(mdev, i,
479 &vp_vdpa->vring[i].notify_pa);
480 if (!vp_vdpa->vring[i].notify) {
481 ret = -EINVAL;
482 dev_warn(&pdev->dev, "Fail to map vq notify %d\n", i);
483 goto err;
484 }
485 }
486 vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
487
488 ret = vdpa_register_device(&vp_vdpa->vdpa, vp_vdpa->queues);
489 if (ret) {
490 dev_err(&pdev->dev, "Failed to register to vdpa bus\n");
491 goto err;
492 }
493
494 return 0;
495
496err:
497 put_device(&vp_vdpa->vdpa.dev);
498 return ret;
499}
500
501static void vp_vdpa_remove(struct pci_dev *pdev)
502{
503 struct vp_vdpa *vp_vdpa = pci_get_drvdata(pdev);
504
505 vdpa_unregister_device(&vp_vdpa->vdpa);
506 vp_modern_remove(&vp_vdpa->mdev);
507}
508
509static struct pci_driver vp_vdpa_driver = {
510 .name = "vp-vdpa",
511 .id_table = NULL,
512 .probe = vp_vdpa_probe,
513 .remove = vp_vdpa_remove,
514};
515
516module_pci_driver(vp_vdpa_driver);
517
518MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
519MODULE_DESCRIPTION("vp-vdpa");
520MODULE_LICENSE("GPL");
521MODULE_VERSION("1");
522
