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19#include <linux/err.h>
20#include <linux/module.h>
21#include <linux/virtio_config.h>
22#include <linux/cpu.h>
23
24#include <uapi/linux/virtio_crypto.h>
25#include "virtio_crypto_common.h"
26
27
28void
29virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
30{
31 if (vc_req) {
32 kzfree(vc_req->req_data);
33 kfree(vc_req->sgs);
34 }
35}
36
37static void virtcrypto_dataq_callback(struct virtqueue *vq)
38{
39 struct virtio_crypto *vcrypto = vq->vdev->priv;
40 struct virtio_crypto_request *vc_req;
41 unsigned long flags;
42 unsigned int len;
43 unsigned int qid = vq->index;
44
45 spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
46 do {
47 virtqueue_disable_cb(vq);
48 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
49 spin_unlock_irqrestore(
50 &vcrypto->data_vq[qid].lock, flags);
51 if (vc_req->alg_cb)
52 vc_req->alg_cb(vc_req, len);
53 spin_lock_irqsave(
54 &vcrypto->data_vq[qid].lock, flags);
55 }
56 } while (!virtqueue_enable_cb(vq));
57 spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
58}
59
60static int virtcrypto_find_vqs(struct virtio_crypto *vi)
61{
62 vq_callback_t **callbacks;
63 struct virtqueue **vqs;
64 int ret = -ENOMEM;
65 int i, total_vqs;
66 const char **names;
67 struct device *dev = &vi->vdev->dev;
68
69
70
71
72
73
74 total_vqs = vi->max_data_queues + 1;
75
76
77 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
78 if (!vqs)
79 goto err_vq;
80 callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
81 if (!callbacks)
82 goto err_callback;
83 names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
84 if (!names)
85 goto err_names;
86
87
88 callbacks[total_vqs - 1] = NULL;
89 names[total_vqs - 1] = "controlq";
90
91
92 for (i = 0; i < vi->max_data_queues; i++) {
93 callbacks[i] = virtcrypto_dataq_callback;
94 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
95 "dataq.%d", i);
96 names[i] = vi->data_vq[i].name;
97 }
98
99 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
100 if (ret)
101 goto err_find;
102
103 vi->ctrl_vq = vqs[total_vqs - 1];
104
105 for (i = 0; i < vi->max_data_queues; i++) {
106 spin_lock_init(&vi->data_vq[i].lock);
107 vi->data_vq[i].vq = vqs[i];
108
109 vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
110 if (!vi->data_vq[i].engine) {
111 ret = -ENOMEM;
112 goto err_engine;
113 }
114
115 vi->data_vq[i].engine->cipher_one_request =
116 virtio_crypto_ablkcipher_crypt_req;
117 }
118
119 kfree(names);
120 kfree(callbacks);
121 kfree(vqs);
122
123 return 0;
124
125err_engine:
126err_find:
127 kfree(names);
128err_names:
129 kfree(callbacks);
130err_callback:
131 kfree(vqs);
132err_vq:
133 return ret;
134}
135
136static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
137{
138 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
139 GFP_KERNEL);
140 if (!vi->data_vq)
141 return -ENOMEM;
142
143 return 0;
144}
145
146static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
147{
148 int i;
149
150 if (vi->affinity_hint_set) {
151 for (i = 0; i < vi->max_data_queues; i++)
152 virtqueue_set_affinity(vi->data_vq[i].vq, -1);
153
154 vi->affinity_hint_set = false;
155 }
156}
157
158static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
159{
160 int i = 0;
161 int cpu;
162
163
164
165
166 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
167 virtcrypto_clean_affinity(vcrypto, -1);
168 return;
169 }
170
171
172
173
174
175
176
177
178 for_each_online_cpu(cpu) {
179 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
180 if (++i >= vcrypto->max_data_queues)
181 break;
182 }
183
184 vcrypto->affinity_hint_set = true;
185}
186
187static void virtcrypto_free_queues(struct virtio_crypto *vi)
188{
189 kfree(vi->data_vq);
190}
191
192static int virtcrypto_init_vqs(struct virtio_crypto *vi)
193{
194 int ret;
195
196
197 ret = virtcrypto_alloc_queues(vi);
198 if (ret)
199 goto err;
200
201 ret = virtcrypto_find_vqs(vi);
202 if (ret)
203 goto err_free;
204
205 get_online_cpus();
206 virtcrypto_set_affinity(vi);
207 put_online_cpus();
208
209 return 0;
210
211err_free:
212 virtcrypto_free_queues(vi);
213err:
214 return ret;
215}
216
217static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
218{
219 u32 status;
220 int err;
221
222 virtio_cread(vcrypto->vdev,
223 struct virtio_crypto_config, status, &status);
224
225
226
227
228
229 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
230 dev_warn(&vcrypto->vdev->dev,
231 "Unknown status bits: 0x%x\n", status);
232
233 virtio_break_device(vcrypto->vdev);
234 return -EPERM;
235 }
236
237 if (vcrypto->status == status)
238 return 0;
239
240 vcrypto->status = status;
241
242 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
243 err = virtcrypto_dev_start(vcrypto);
244 if (err) {
245 dev_err(&vcrypto->vdev->dev,
246 "Failed to start virtio crypto device.\n");
247
248 return -EPERM;
249 }
250 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
251 } else {
252 virtcrypto_dev_stop(vcrypto);
253 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
254 }
255
256 return 0;
257}
258
259static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
260{
261 int32_t i;
262 int ret;
263
264 for (i = 0; i < vcrypto->max_data_queues; i++) {
265 if (vcrypto->data_vq[i].engine) {
266 ret = crypto_engine_start(vcrypto->data_vq[i].engine);
267 if (ret)
268 goto err;
269 }
270 }
271
272 return 0;
273
274err:
275 while (--i >= 0)
276 if (vcrypto->data_vq[i].engine)
277 crypto_engine_exit(vcrypto->data_vq[i].engine);
278
279 return ret;
280}
281
282static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
283{
284 u32 i;
285
286 for (i = 0; i < vcrypto->max_data_queues; i++)
287 if (vcrypto->data_vq[i].engine)
288 crypto_engine_exit(vcrypto->data_vq[i].engine);
289}
290
291static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
292{
293 struct virtio_device *vdev = vcrypto->vdev;
294
295 virtcrypto_clean_affinity(vcrypto, -1);
296
297 vdev->config->del_vqs(vdev);
298
299 virtcrypto_free_queues(vcrypto);
300}
301
302static int virtcrypto_probe(struct virtio_device *vdev)
303{
304 int err = -EFAULT;
305 struct virtio_crypto *vcrypto;
306 u32 max_data_queues = 0, max_cipher_key_len = 0;
307 u32 max_auth_key_len = 0;
308 u64 max_size = 0;
309
310 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
311 return -ENODEV;
312
313 if (!vdev->config->get) {
314 dev_err(&vdev->dev, "%s failure: config access disabled\n",
315 __func__);
316 return -EINVAL;
317 }
318
319 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
320
321
322
323
324
325 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
326 return -EINVAL;
327 }
328
329 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
330 dev_to_node(&vdev->dev));
331 if (!vcrypto)
332 return -ENOMEM;
333
334 virtio_cread(vdev, struct virtio_crypto_config,
335 max_dataqueues, &max_data_queues);
336 if (max_data_queues < 1)
337 max_data_queues = 1;
338
339 virtio_cread(vdev, struct virtio_crypto_config,
340 max_cipher_key_len, &max_cipher_key_len);
341 virtio_cread(vdev, struct virtio_crypto_config,
342 max_auth_key_len, &max_auth_key_len);
343 virtio_cread(vdev, struct virtio_crypto_config,
344 max_size, &max_size);
345
346
347 err = virtcrypto_devmgr_add_dev(vcrypto);
348 if (err) {
349 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
350 goto free;
351 }
352 vcrypto->owner = THIS_MODULE;
353 vcrypto = vdev->priv = vcrypto;
354 vcrypto->vdev = vdev;
355
356 spin_lock_init(&vcrypto->ctrl_lock);
357
358
359 vcrypto->curr_queue = 1;
360 vcrypto->max_data_queues = max_data_queues;
361 vcrypto->max_cipher_key_len = max_cipher_key_len;
362 vcrypto->max_auth_key_len = max_auth_key_len;
363 vcrypto->max_size = max_size;
364
365 dev_info(&vdev->dev,
366 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
367 vcrypto->max_data_queues,
368 vcrypto->max_cipher_key_len,
369 vcrypto->max_auth_key_len,
370 vcrypto->max_size);
371
372 err = virtcrypto_init_vqs(vcrypto);
373 if (err) {
374 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
375 goto free_dev;
376 }
377
378 err = virtcrypto_start_crypto_engines(vcrypto);
379 if (err)
380 goto free_vqs;
381
382 virtio_device_ready(vdev);
383
384 err = virtcrypto_update_status(vcrypto);
385 if (err)
386 goto free_engines;
387
388 return 0;
389
390free_engines:
391 virtcrypto_clear_crypto_engines(vcrypto);
392free_vqs:
393 vcrypto->vdev->config->reset(vdev);
394 virtcrypto_del_vqs(vcrypto);
395free_dev:
396 virtcrypto_devmgr_rm_dev(vcrypto);
397free:
398 kfree(vcrypto);
399 return err;
400}
401
402static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
403{
404 struct virtio_crypto_request *vc_req;
405 int i;
406 struct virtqueue *vq;
407
408 for (i = 0; i < vcrypto->max_data_queues; i++) {
409 vq = vcrypto->data_vq[i].vq;
410 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
411 kfree(vc_req->req_data);
412 kfree(vc_req->sgs);
413 }
414 }
415}
416
417static void virtcrypto_remove(struct virtio_device *vdev)
418{
419 struct virtio_crypto *vcrypto = vdev->priv;
420
421 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
422
423 if (virtcrypto_dev_started(vcrypto))
424 virtcrypto_dev_stop(vcrypto);
425 vdev->config->reset(vdev);
426 virtcrypto_free_unused_reqs(vcrypto);
427 virtcrypto_clear_crypto_engines(vcrypto);
428 virtcrypto_del_vqs(vcrypto);
429 virtcrypto_devmgr_rm_dev(vcrypto);
430 kfree(vcrypto);
431}
432
433static void virtcrypto_config_changed(struct virtio_device *vdev)
434{
435 struct virtio_crypto *vcrypto = vdev->priv;
436
437 virtcrypto_update_status(vcrypto);
438}
439
440#ifdef CONFIG_PM_SLEEP
441static int virtcrypto_freeze(struct virtio_device *vdev)
442{
443 struct virtio_crypto *vcrypto = vdev->priv;
444
445 vdev->config->reset(vdev);
446 virtcrypto_free_unused_reqs(vcrypto);
447 if (virtcrypto_dev_started(vcrypto))
448 virtcrypto_dev_stop(vcrypto);
449
450 virtcrypto_clear_crypto_engines(vcrypto);
451 virtcrypto_del_vqs(vcrypto);
452 return 0;
453}
454
455static int virtcrypto_restore(struct virtio_device *vdev)
456{
457 struct virtio_crypto *vcrypto = vdev->priv;
458 int err;
459
460 err = virtcrypto_init_vqs(vcrypto);
461 if (err)
462 return err;
463
464 err = virtcrypto_start_crypto_engines(vcrypto);
465 if (err)
466 goto free_vqs;
467
468 virtio_device_ready(vdev);
469
470 err = virtcrypto_dev_start(vcrypto);
471 if (err) {
472 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
473 goto free_engines;
474 }
475
476 return 0;
477
478free_engines:
479 virtcrypto_clear_crypto_engines(vcrypto);
480free_vqs:
481 vcrypto->vdev->config->reset(vdev);
482 virtcrypto_del_vqs(vcrypto);
483 return err;
484}
485#endif
486
487static unsigned int features[] = {
488
489};
490
491static struct virtio_device_id id_table[] = {
492 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
493 { 0 },
494};
495
496static struct virtio_driver virtio_crypto_driver = {
497 .driver.name = KBUILD_MODNAME,
498 .driver.owner = THIS_MODULE,
499 .feature_table = features,
500 .feature_table_size = ARRAY_SIZE(features),
501 .id_table = id_table,
502 .probe = virtcrypto_probe,
503 .remove = virtcrypto_remove,
504 .config_changed = virtcrypto_config_changed,
505#ifdef CONFIG_PM_SLEEP
506 .freeze = virtcrypto_freeze,
507 .restore = virtcrypto_restore,
508#endif
509};
510
511module_virtio_driver(virtio_crypto_driver);
512
513MODULE_DEVICE_TABLE(virtio, id_table);
514MODULE_DESCRIPTION("virtio crypto device driver");
515MODULE_LICENSE("GPL");
516MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");
517
