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