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1// SPDX-License-Identifier: GPL-2.0-or-later
2 /* Driver for Virtio crypto device.
3 *
4 * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
5 */
6
7#include <linux/err.h>
8#include <linux/module.h>
9#include <linux/virtio_config.h>
10#include <linux/cpu.h>
11
12#include <uapi/linux/virtio_crypto.h>
13#include "virtio_crypto_common.h"
14
15
16void
17virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
18{
19 if (vc_req) {
20 kfree_sensitive(vc_req->req_data);
21 kfree(vc_req->sgs);
22 }
23}
24
25static void virtcrypto_dataq_callback(struct virtqueue *vq)
26{
27 struct virtio_crypto *vcrypto = vq->vdev->priv;
28 struct virtio_crypto_request *vc_req;
29 unsigned long flags;
30 unsigned int len;
31 unsigned int qid = vq->index;
32
33 spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
34 do {
35 virtqueue_disable_cb(vq);
36 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
37 spin_unlock_irqrestore(
38 &vcrypto->data_vq[qid].lock, flags);
39 if (vc_req->alg_cb)
40 vc_req->alg_cb(vc_req, len);
41 spin_lock_irqsave(
42 &vcrypto->data_vq[qid].lock, flags);
43 }
44 } while (!virtqueue_enable_cb(vq));
45 spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
46}
47
48static int virtcrypto_find_vqs(struct virtio_crypto *vi)
49{
50 vq_callback_t **callbacks;
51 struct virtqueue **vqs;
52 int ret = -ENOMEM;
53 int i, total_vqs;
54 const char **names;
55 struct device *dev = &vi->vdev->dev;
56
57 /*
58 * We expect 1 data virtqueue, followed by
59 * possible N-1 data queues used in multiqueue mode,
60 * followed by control vq.
61 */
62 total_vqs = vi->max_data_queues + 1;
63
64 /* Allocate space for find_vqs parameters */
65 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
66 if (!vqs)
67 goto err_vq;
68 callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
69 if (!callbacks)
70 goto err_callback;
71 names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
72 if (!names)
73 goto err_names;
74
75 /* Parameters for control virtqueue */
76 callbacks[total_vqs - 1] = NULL;
77 names[total_vqs - 1] = "controlq";
78
79 /* Allocate/initialize parameters for data virtqueues */
80 for (i = 0; i < vi->max_data_queues; i++) {
81 callbacks[i] = virtcrypto_dataq_callback;
82 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
83 "dataq.%d", i);
84 names[i] = vi->data_vq[i].name;
85 }
86
87 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
88 if (ret)
89 goto err_find;
90
91 vi->ctrl_vq = vqs[total_vqs - 1];
92
93 for (i = 0; i < vi->max_data_queues; i++) {
94 spin_lock_init(&vi->data_vq[i].lock);
95 vi->data_vq[i].vq = vqs[i];
96 /* Initialize crypto engine */
97 vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
98 if (!vi->data_vq[i].engine) {
99 ret = -ENOMEM;
100 goto err_engine;
101 }
102 }
103
104 kfree(names);
105 kfree(callbacks);
106 kfree(vqs);
107
108 return 0;
109
110err_engine:
111err_find:
112 kfree(names);
113err_names:
114 kfree(callbacks);
115err_callback:
116 kfree(vqs);
117err_vq:
118 return ret;
119}
120
121static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
122{
123 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
124 GFP_KERNEL);
125 if (!vi->data_vq)
126 return -ENOMEM;
127
128 return 0;
129}
130
131static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
132{
133 int i;
134
135 if (vi->affinity_hint_set) {
136 for (i = 0; i < vi->max_data_queues; i++)
137 virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
138
139 vi->affinity_hint_set = false;
140 }
141}
142
143static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
144{
145 int i = 0;
146 int cpu;
147
148 /*
149 * In single queue mode, we don't set the cpu affinity.
150 */
151 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
152 virtcrypto_clean_affinity(vcrypto, -1);
153 return;
154 }
155
156 /*
157 * In multiqueue mode, we let the queue to be private to one cpu
158 * by setting the affinity hint to eliminate the contention.
159 *
160 * TODO: adds cpu hotplug support by register cpu notifier.
161 *
162 */
163 for_each_online_cpu(cpu) {
164 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
165 if (++i >= vcrypto->max_data_queues)
166 break;
167 }
168
169 vcrypto->affinity_hint_set = true;
170}
171
172static void virtcrypto_free_queues(struct virtio_crypto *vi)
173{
174 kfree(vi->data_vq);
175}
176
177static int virtcrypto_init_vqs(struct virtio_crypto *vi)
178{
179 int ret;
180
181 /* Allocate send & receive queues */
182 ret = virtcrypto_alloc_queues(vi);
183 if (ret)
184 goto err;
185
186 ret = virtcrypto_find_vqs(vi);
187 if (ret)
188 goto err_free;
189
190 get_online_cpus();
191 virtcrypto_set_affinity(vi);
192 put_online_cpus();
193
194 return 0;
195
196err_free:
197 virtcrypto_free_queues(vi);
198err:
199 return ret;
200}
201
202static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
203{
204 u32 status;
205 int err;
206
207 virtio_cread_le(vcrypto->vdev,
208 struct virtio_crypto_config, status, &status);
209
210 /*
211 * Unknown status bits would be a host error and the driver
212 * should consider the device to be broken.
213 */
214 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
215 dev_warn(&vcrypto->vdev->dev,
216 "Unknown status bits: 0x%x\n", status);
217
218 virtio_break_device(vcrypto->vdev);
219 return -EPERM;
220 }
221
222 if (vcrypto->status == status)
223 return 0;
224
225 vcrypto->status = status;
226
227 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
228 err = virtcrypto_dev_start(vcrypto);
229 if (err) {
230 dev_err(&vcrypto->vdev->dev,
231 "Failed to start virtio crypto device.\n");
232
233 return -EPERM;
234 }
235 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
236 } else {
237 virtcrypto_dev_stop(vcrypto);
238 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
239 }
240
241 return 0;
242}
243
244static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
245{
246 int32_t i;
247 int ret;
248
249 for (i = 0; i < vcrypto->max_data_queues; i++) {
250 if (vcrypto->data_vq[i].engine) {
251 ret = crypto_engine_start(vcrypto->data_vq[i].engine);
252 if (ret)
253 goto err;
254 }
255 }
256
257 return 0;
258
259err:
260 while (--i >= 0)
261 if (vcrypto->data_vq[i].engine)
262 crypto_engine_exit(vcrypto->data_vq[i].engine);
263
264 return ret;
265}
266
267static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
268{
269 u32 i;
270
271 for (i = 0; i < vcrypto->max_data_queues; i++)
272 if (vcrypto->data_vq[i].engine)
273 crypto_engine_exit(vcrypto->data_vq[i].engine);
274}
275
276static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
277{
278 struct virtio_device *vdev = vcrypto->vdev;
279
280 virtcrypto_clean_affinity(vcrypto, -1);
281
282 vdev->config->del_vqs(vdev);
283
284 virtcrypto_free_queues(vcrypto);
285}
286
287static int virtcrypto_probe(struct virtio_device *vdev)
288{
289 int err = -EFAULT;
290 struct virtio_crypto *vcrypto;
291 u32 max_data_queues = 0, max_cipher_key_len = 0;
292 u32 max_auth_key_len = 0;
293 u64 max_size = 0;
294 u32 cipher_algo_l = 0;
295 u32 cipher_algo_h = 0;
296 u32 hash_algo = 0;
297 u32 mac_algo_l = 0;
298 u32 mac_algo_h = 0;
299 u32 aead_algo = 0;
300 u32 crypto_services = 0;
301
302 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
303 return -ENODEV;
304
305 if (!vdev->config->get) {
306 dev_err(&vdev->dev, "%s failure: config access disabled\n",
307 __func__);
308 return -EINVAL;
309 }
310
311 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
312 /*
313 * If the accelerator is connected to a node with no memory
314 * there is no point in using the accelerator since the remote
315 * memory transaction will be very slow.
316 */
317 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
318 return -EINVAL;
319 }
320
321 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
322 dev_to_node(&vdev->dev));
323 if (!vcrypto)
324 return -ENOMEM;
325
326 virtio_cread_le(vdev, struct virtio_crypto_config,
327 max_dataqueues, &max_data_queues);
328 if (max_data_queues < 1)
329 max_data_queues = 1;
330
331 virtio_cread_le(vdev, struct virtio_crypto_config,
332 max_cipher_key_len, &max_cipher_key_len);
333 virtio_cread_le(vdev, struct virtio_crypto_config,
334 max_auth_key_len, &max_auth_key_len);
335 virtio_cread_le(vdev, struct virtio_crypto_config,
336 max_size, &max_size);
337 virtio_cread_le(vdev, struct virtio_crypto_config,
338 crypto_services, &crypto_services);
339 virtio_cread_le(vdev, struct virtio_crypto_config,
340 cipher_algo_l, &cipher_algo_l);
341 virtio_cread_le(vdev, struct virtio_crypto_config,
342 cipher_algo_h, &cipher_algo_h);
343 virtio_cread_le(vdev, struct virtio_crypto_config,
344 hash_algo, &hash_algo);
345 virtio_cread_le(vdev, struct virtio_crypto_config,
346 mac_algo_l, &mac_algo_l);
347 virtio_cread_le(vdev, struct virtio_crypto_config,
348 mac_algo_h, &mac_algo_h);
349 virtio_cread_le(vdev, struct virtio_crypto_config,
350 aead_algo, &aead_algo);
351
352 /* Add virtio crypto device to global table */
353 err = virtcrypto_devmgr_add_dev(vcrypto);
354 if (err) {
355 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
356 goto free;
357 }
358 vcrypto->owner = THIS_MODULE;
359 vcrypto = vdev->priv = vcrypto;
360 vcrypto->vdev = vdev;
361
362 spin_lock_init(&vcrypto->ctrl_lock);
363
364 /* Use single data queue as default */
365 vcrypto->curr_queue = 1;
366 vcrypto->max_data_queues = max_data_queues;
367 vcrypto->max_cipher_key_len = max_cipher_key_len;
368 vcrypto->max_auth_key_len = max_auth_key_len;
369 vcrypto->max_size = max_size;
370 vcrypto->crypto_services = crypto_services;
371 vcrypto->cipher_algo_l = cipher_algo_l;
372 vcrypto->cipher_algo_h = cipher_algo_h;
373 vcrypto->mac_algo_l = mac_algo_l;
374 vcrypto->mac_algo_h = mac_algo_h;
375 vcrypto->hash_algo = hash_algo;
376 vcrypto->aead_algo = aead_algo;
377
378
379 dev_info(&vdev->dev,
380 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
381 vcrypto->max_data_queues,
382 vcrypto->max_cipher_key_len,
383 vcrypto->max_auth_key_len,
384 vcrypto->max_size);
385
386 err = virtcrypto_init_vqs(vcrypto);
387 if (err) {
388 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
389 goto free_dev;
390 }
391
392 err = virtcrypto_start_crypto_engines(vcrypto);
393 if (err)
394 goto free_vqs;
395
396 virtio_device_ready(vdev);
397
398 err = virtcrypto_update_status(vcrypto);
399 if (err)
400 goto free_engines;
401
402 return 0;
403
404free_engines:
405 virtcrypto_clear_crypto_engines(vcrypto);
406free_vqs:
407 vcrypto->vdev->config->reset(vdev);
408 virtcrypto_del_vqs(vcrypto);
409free_dev:
410 virtcrypto_devmgr_rm_dev(vcrypto);
411free:
412 kfree(vcrypto);
413 return err;
414}
415
416static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
417{
418 struct virtio_crypto_request *vc_req;
419 int i;
420 struct virtqueue *vq;
421
422 for (i = 0; i < vcrypto->max_data_queues; i++) {
423 vq = vcrypto->data_vq[i].vq;
424 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
425 kfree(vc_req->req_data);
426 kfree(vc_req->sgs);
427 }
428 }
429}
430
431static void virtcrypto_remove(struct virtio_device *vdev)
432{
433 struct virtio_crypto *vcrypto = vdev->priv;
434
435 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
436
437 if (virtcrypto_dev_started(vcrypto))
438 virtcrypto_dev_stop(vcrypto);
439 vdev->config->reset(vdev);
440 virtcrypto_free_unused_reqs(vcrypto);
441 virtcrypto_clear_crypto_engines(vcrypto);
442 virtcrypto_del_vqs(vcrypto);
443 virtcrypto_devmgr_rm_dev(vcrypto);
444 kfree(vcrypto);
445}
446
447static void virtcrypto_config_changed(struct virtio_device *vdev)
448{
449 struct virtio_crypto *vcrypto = vdev->priv;
450
451 virtcrypto_update_status(vcrypto);
452}
453
454#ifdef CONFIG_PM_SLEEP
455static int virtcrypto_freeze(struct virtio_device *vdev)
456{
457 struct virtio_crypto *vcrypto = vdev->priv;
458
459 vdev->config->reset(vdev);
460 virtcrypto_free_unused_reqs(vcrypto);
461 if (virtcrypto_dev_started(vcrypto))
462 virtcrypto_dev_stop(vcrypto);
463
464 virtcrypto_clear_crypto_engines(vcrypto);
465 virtcrypto_del_vqs(vcrypto);
466 return 0;
467}
468
469static int virtcrypto_restore(struct virtio_device *vdev)
470{
471 struct virtio_crypto *vcrypto = vdev->priv;
472 int err;
473
474 err = virtcrypto_init_vqs(vcrypto);
475 if (err)
476 return err;
477
478 err = virtcrypto_start_crypto_engines(vcrypto);
479 if (err)
480 goto free_vqs;
481
482 virtio_device_ready(vdev);
483
484 err = virtcrypto_dev_start(vcrypto);
485 if (err) {
486 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
487 goto free_engines;
488 }
489
490 return 0;
491
492free_engines:
493 virtcrypto_clear_crypto_engines(vcrypto);
494free_vqs:
495 vcrypto->vdev->config->reset(vdev);
496 virtcrypto_del_vqs(vcrypto);
497 return err;
498}
499#endif
500
501static const unsigned int features[] = {
502 /* none */
503};
504
505static const struct virtio_device_id id_table[] = {
506 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
507 { 0 },
508};
509
510static struct virtio_driver virtio_crypto_driver = {
511 .driver.name = KBUILD_MODNAME,
512 .driver.owner = THIS_MODULE,
513 .feature_table = features,
514 .feature_table_size = ARRAY_SIZE(features),
515 .id_table = id_table,
516 .probe = virtcrypto_probe,
517 .remove = virtcrypto_remove,
518 .config_changed = virtcrypto_config_changed,
519#ifdef CONFIG_PM_SLEEP
520 .freeze = virtcrypto_freeze,
521 .restore = virtcrypto_restore,
522#endif
523};
524
525module_virtio_driver(virtio_crypto_driver);
526
527MODULE_DEVICE_TABLE(virtio, id_table);
528MODULE_DESCRIPTION("virtio crypto device driver");
529MODULE_LICENSE("GPL");
530MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");
1// SPDX-License-Identifier: GPL-2.0-or-later
2 /* Driver for Virtio crypto device.
3 *
4 * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
5 */
6
7#include <linux/err.h>
8#include <linux/module.h>
9#include <linux/virtio_config.h>
10#include <linux/cpu.h>
11
12#include <uapi/linux/virtio_crypto.h>
13#include "virtio_crypto_common.h"
14
15
16void
17virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
18{
19 if (vc_req) {
20 kfree_sensitive(vc_req->req_data);
21 kfree(vc_req->sgs);
22 }
23}
24
25static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req)
26{
27 complete(&vc_ctrl_req->compl);
28}
29
30static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
31{
32 struct virtio_crypto *vcrypto = vq->vdev->priv;
33 struct virtio_crypto_ctrl_request *vc_ctrl_req;
34 unsigned long flags;
35 unsigned int len;
36
37 spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
38 do {
39 virtqueue_disable_cb(vq);
40 while ((vc_ctrl_req = virtqueue_get_buf(vq, &len)) != NULL) {
41 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
42 virtio_crypto_ctrlq_callback(vc_ctrl_req);
43 spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
44 }
45 if (unlikely(virtqueue_is_broken(vq)))
46 break;
47 } while (!virtqueue_enable_cb(vq));
48 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
49}
50
51int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct scatterlist *sgs[],
52 unsigned int out_sgs, unsigned int in_sgs,
53 struct virtio_crypto_ctrl_request *vc_ctrl_req)
54{
55 int err;
56 unsigned long flags;
57
58 init_completion(&vc_ctrl_req->compl);
59
60 spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
61 err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, out_sgs, in_sgs, vc_ctrl_req, GFP_ATOMIC);
62 if (err < 0) {
63 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
64 return err;
65 }
66
67 virtqueue_kick(vcrypto->ctrl_vq);
68 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
69
70 wait_for_completion(&vc_ctrl_req->compl);
71
72 return 0;
73}
74
75static void virtcrypto_dataq_callback(struct virtqueue *vq)
76{
77 struct virtio_crypto *vcrypto = vq->vdev->priv;
78 struct virtio_crypto_request *vc_req;
79 unsigned long flags;
80 unsigned int len;
81 unsigned int qid = vq->index;
82
83 spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
84 do {
85 virtqueue_disable_cb(vq);
86 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
87 spin_unlock_irqrestore(
88 &vcrypto->data_vq[qid].lock, flags);
89 if (vc_req->alg_cb)
90 vc_req->alg_cb(vc_req, len);
91 spin_lock_irqsave(
92 &vcrypto->data_vq[qid].lock, flags);
93 }
94 } while (!virtqueue_enable_cb(vq));
95 spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
96}
97
98static int virtcrypto_find_vqs(struct virtio_crypto *vi)
99{
100 vq_callback_t **callbacks;
101 struct virtqueue **vqs;
102 int ret = -ENOMEM;
103 int i, total_vqs;
104 const char **names;
105 struct device *dev = &vi->vdev->dev;
106
107 /*
108 * We expect 1 data virtqueue, followed by
109 * possible N-1 data queues used in multiqueue mode,
110 * followed by control vq.
111 */
112 total_vqs = vi->max_data_queues + 1;
113
114 /* Allocate space for find_vqs parameters */
115 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
116 if (!vqs)
117 goto err_vq;
118 callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
119 if (!callbacks)
120 goto err_callback;
121 names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
122 if (!names)
123 goto err_names;
124
125 /* Parameters for control virtqueue */
126 callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
127 names[total_vqs - 1] = "controlq";
128
129 /* Allocate/initialize parameters for data virtqueues */
130 for (i = 0; i < vi->max_data_queues; i++) {
131 callbacks[i] = virtcrypto_dataq_callback;
132 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
133 "dataq.%d", i);
134 names[i] = vi->data_vq[i].name;
135 }
136
137 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
138 if (ret)
139 goto err_find;
140
141 vi->ctrl_vq = vqs[total_vqs - 1];
142
143 for (i = 0; i < vi->max_data_queues; i++) {
144 spin_lock_init(&vi->data_vq[i].lock);
145 vi->data_vq[i].vq = vqs[i];
146 /* Initialize crypto engine */
147 vi->data_vq[i].engine = crypto_engine_alloc_init_and_set(dev, true, NULL, true,
148 virtqueue_get_vring_size(vqs[i]));
149 if (!vi->data_vq[i].engine) {
150 ret = -ENOMEM;
151 goto err_engine;
152 }
153 }
154
155 kfree(names);
156 kfree(callbacks);
157 kfree(vqs);
158
159 return 0;
160
161err_engine:
162err_find:
163 kfree(names);
164err_names:
165 kfree(callbacks);
166err_callback:
167 kfree(vqs);
168err_vq:
169 return ret;
170}
171
172static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
173{
174 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
175 GFP_KERNEL);
176 if (!vi->data_vq)
177 return -ENOMEM;
178
179 return 0;
180}
181
182static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
183{
184 int i;
185
186 if (vi->affinity_hint_set) {
187 for (i = 0; i < vi->max_data_queues; i++)
188 virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
189
190 vi->affinity_hint_set = false;
191 }
192}
193
194static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
195{
196 int i = 0;
197 int cpu;
198
199 /*
200 * In single queue mode, we don't set the cpu affinity.
201 */
202 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
203 virtcrypto_clean_affinity(vcrypto, -1);
204 return;
205 }
206
207 /*
208 * In multiqueue mode, we let the queue to be private to one cpu
209 * by setting the affinity hint to eliminate the contention.
210 *
211 * TODO: adds cpu hotplug support by register cpu notifier.
212 *
213 */
214 for_each_online_cpu(cpu) {
215 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
216 if (++i >= vcrypto->max_data_queues)
217 break;
218 }
219
220 vcrypto->affinity_hint_set = true;
221}
222
223static void virtcrypto_free_queues(struct virtio_crypto *vi)
224{
225 kfree(vi->data_vq);
226}
227
228static int virtcrypto_init_vqs(struct virtio_crypto *vi)
229{
230 int ret;
231
232 /* Allocate send & receive queues */
233 ret = virtcrypto_alloc_queues(vi);
234 if (ret)
235 goto err;
236
237 ret = virtcrypto_find_vqs(vi);
238 if (ret)
239 goto err_free;
240
241 cpus_read_lock();
242 virtcrypto_set_affinity(vi);
243 cpus_read_unlock();
244
245 return 0;
246
247err_free:
248 virtcrypto_free_queues(vi);
249err:
250 return ret;
251}
252
253static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
254{
255 u32 status;
256 int err;
257
258 virtio_cread_le(vcrypto->vdev,
259 struct virtio_crypto_config, status, &status);
260
261 /*
262 * Unknown status bits would be a host error and the driver
263 * should consider the device to be broken.
264 */
265 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
266 dev_warn(&vcrypto->vdev->dev,
267 "Unknown status bits: 0x%x\n", status);
268
269 virtio_break_device(vcrypto->vdev);
270 return -EPERM;
271 }
272
273 if (vcrypto->status == status)
274 return 0;
275
276 vcrypto->status = status;
277
278 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
279 err = virtcrypto_dev_start(vcrypto);
280 if (err) {
281 dev_err(&vcrypto->vdev->dev,
282 "Failed to start virtio crypto device.\n");
283
284 return -EPERM;
285 }
286 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
287 } else {
288 virtcrypto_dev_stop(vcrypto);
289 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
290 }
291
292 return 0;
293}
294
295static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
296{
297 int32_t i;
298 int ret;
299
300 for (i = 0; i < vcrypto->max_data_queues; i++) {
301 if (vcrypto->data_vq[i].engine) {
302 ret = crypto_engine_start(vcrypto->data_vq[i].engine);
303 if (ret)
304 goto err;
305 }
306 }
307
308 return 0;
309
310err:
311 while (--i >= 0)
312 if (vcrypto->data_vq[i].engine)
313 crypto_engine_exit(vcrypto->data_vq[i].engine);
314
315 return ret;
316}
317
318static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
319{
320 u32 i;
321
322 for (i = 0; i < vcrypto->max_data_queues; i++)
323 if (vcrypto->data_vq[i].engine)
324 crypto_engine_exit(vcrypto->data_vq[i].engine);
325}
326
327static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
328{
329 struct virtio_device *vdev = vcrypto->vdev;
330
331 virtcrypto_clean_affinity(vcrypto, -1);
332
333 vdev->config->del_vqs(vdev);
334
335 virtcrypto_free_queues(vcrypto);
336}
337
338static int virtcrypto_probe(struct virtio_device *vdev)
339{
340 int err = -EFAULT;
341 struct virtio_crypto *vcrypto;
342 u32 max_data_queues = 0, max_cipher_key_len = 0;
343 u32 max_auth_key_len = 0;
344 u64 max_size = 0;
345 u32 cipher_algo_l = 0;
346 u32 cipher_algo_h = 0;
347 u32 hash_algo = 0;
348 u32 mac_algo_l = 0;
349 u32 mac_algo_h = 0;
350 u32 aead_algo = 0;
351 u32 akcipher_algo = 0;
352 u32 crypto_services = 0;
353
354 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
355 return -ENODEV;
356
357 if (!vdev->config->get) {
358 dev_err(&vdev->dev, "%s failure: config access disabled\n",
359 __func__);
360 return -EINVAL;
361 }
362
363 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
364 /*
365 * If the accelerator is connected to a node with no memory
366 * there is no point in using the accelerator since the remote
367 * memory transaction will be very slow.
368 */
369 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
370 return -EINVAL;
371 }
372
373 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
374 dev_to_node(&vdev->dev));
375 if (!vcrypto)
376 return -ENOMEM;
377
378 virtio_cread_le(vdev, struct virtio_crypto_config,
379 max_dataqueues, &max_data_queues);
380 if (max_data_queues < 1)
381 max_data_queues = 1;
382
383 virtio_cread_le(vdev, struct virtio_crypto_config,
384 max_cipher_key_len, &max_cipher_key_len);
385 virtio_cread_le(vdev, struct virtio_crypto_config,
386 max_auth_key_len, &max_auth_key_len);
387 virtio_cread_le(vdev, struct virtio_crypto_config,
388 max_size, &max_size);
389 virtio_cread_le(vdev, struct virtio_crypto_config,
390 crypto_services, &crypto_services);
391 virtio_cread_le(vdev, struct virtio_crypto_config,
392 cipher_algo_l, &cipher_algo_l);
393 virtio_cread_le(vdev, struct virtio_crypto_config,
394 cipher_algo_h, &cipher_algo_h);
395 virtio_cread_le(vdev, struct virtio_crypto_config,
396 hash_algo, &hash_algo);
397 virtio_cread_le(vdev, struct virtio_crypto_config,
398 mac_algo_l, &mac_algo_l);
399 virtio_cread_le(vdev, struct virtio_crypto_config,
400 mac_algo_h, &mac_algo_h);
401 virtio_cread_le(vdev, struct virtio_crypto_config,
402 aead_algo, &aead_algo);
403 if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
404 virtio_cread_le(vdev, struct virtio_crypto_config,
405 akcipher_algo, &akcipher_algo);
406
407 /* Add virtio crypto device to global table */
408 err = virtcrypto_devmgr_add_dev(vcrypto);
409 if (err) {
410 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
411 goto free;
412 }
413 vcrypto->owner = THIS_MODULE;
414 vcrypto = vdev->priv = vcrypto;
415 vcrypto->vdev = vdev;
416
417 spin_lock_init(&vcrypto->ctrl_lock);
418
419 /* Use single data queue as default */
420 vcrypto->curr_queue = 1;
421 vcrypto->max_data_queues = max_data_queues;
422 vcrypto->max_cipher_key_len = max_cipher_key_len;
423 vcrypto->max_auth_key_len = max_auth_key_len;
424 vcrypto->max_size = max_size;
425 vcrypto->crypto_services = crypto_services;
426 vcrypto->cipher_algo_l = cipher_algo_l;
427 vcrypto->cipher_algo_h = cipher_algo_h;
428 vcrypto->mac_algo_l = mac_algo_l;
429 vcrypto->mac_algo_h = mac_algo_h;
430 vcrypto->hash_algo = hash_algo;
431 vcrypto->aead_algo = aead_algo;
432 vcrypto->akcipher_algo = akcipher_algo;
433
434 dev_info(&vdev->dev,
435 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
436 vcrypto->max_data_queues,
437 vcrypto->max_cipher_key_len,
438 vcrypto->max_auth_key_len,
439 vcrypto->max_size);
440
441 err = virtcrypto_init_vqs(vcrypto);
442 if (err) {
443 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
444 goto free_dev;
445 }
446
447 err = virtcrypto_start_crypto_engines(vcrypto);
448 if (err)
449 goto free_vqs;
450
451 virtio_device_ready(vdev);
452
453 err = virtcrypto_update_status(vcrypto);
454 if (err)
455 goto free_engines;
456
457 return 0;
458
459free_engines:
460 virtcrypto_clear_crypto_engines(vcrypto);
461free_vqs:
462 virtio_reset_device(vdev);
463 virtcrypto_del_vqs(vcrypto);
464free_dev:
465 virtcrypto_devmgr_rm_dev(vcrypto);
466free:
467 kfree(vcrypto);
468 return err;
469}
470
471static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
472{
473 struct virtio_crypto_request *vc_req;
474 int i;
475 struct virtqueue *vq;
476
477 for (i = 0; i < vcrypto->max_data_queues; i++) {
478 vq = vcrypto->data_vq[i].vq;
479 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
480 kfree(vc_req->req_data);
481 kfree(vc_req->sgs);
482 }
483 }
484}
485
486static void virtcrypto_remove(struct virtio_device *vdev)
487{
488 struct virtio_crypto *vcrypto = vdev->priv;
489
490 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
491
492 if (virtcrypto_dev_started(vcrypto))
493 virtcrypto_dev_stop(vcrypto);
494 virtio_reset_device(vdev);
495 virtcrypto_free_unused_reqs(vcrypto);
496 virtcrypto_clear_crypto_engines(vcrypto);
497 virtcrypto_del_vqs(vcrypto);
498 virtcrypto_devmgr_rm_dev(vcrypto);
499 kfree(vcrypto);
500}
501
502static void virtcrypto_config_changed(struct virtio_device *vdev)
503{
504 struct virtio_crypto *vcrypto = vdev->priv;
505
506 virtcrypto_update_status(vcrypto);
507}
508
509#ifdef CONFIG_PM_SLEEP
510static int virtcrypto_freeze(struct virtio_device *vdev)
511{
512 struct virtio_crypto *vcrypto = vdev->priv;
513
514 virtio_reset_device(vdev);
515 virtcrypto_free_unused_reqs(vcrypto);
516 if (virtcrypto_dev_started(vcrypto))
517 virtcrypto_dev_stop(vcrypto);
518
519 virtcrypto_clear_crypto_engines(vcrypto);
520 virtcrypto_del_vqs(vcrypto);
521 return 0;
522}
523
524static int virtcrypto_restore(struct virtio_device *vdev)
525{
526 struct virtio_crypto *vcrypto = vdev->priv;
527 int err;
528
529 err = virtcrypto_init_vqs(vcrypto);
530 if (err)
531 return err;
532
533 err = virtcrypto_start_crypto_engines(vcrypto);
534 if (err)
535 goto free_vqs;
536
537 virtio_device_ready(vdev);
538
539 err = virtcrypto_dev_start(vcrypto);
540 if (err) {
541 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
542 goto free_engines;
543 }
544
545 return 0;
546
547free_engines:
548 virtcrypto_clear_crypto_engines(vcrypto);
549free_vqs:
550 virtio_reset_device(vdev);
551 virtcrypto_del_vqs(vcrypto);
552 return err;
553}
554#endif
555
556static const unsigned int features[] = {
557 /* none */
558};
559
560static const struct virtio_device_id id_table[] = {
561 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
562 { 0 },
563};
564
565static struct virtio_driver virtio_crypto_driver = {
566 .driver.name = KBUILD_MODNAME,
567 .driver.owner = THIS_MODULE,
568 .feature_table = features,
569 .feature_table_size = ARRAY_SIZE(features),
570 .id_table = id_table,
571 .probe = virtcrypto_probe,
572 .remove = virtcrypto_remove,
573 .config_changed = virtcrypto_config_changed,
574#ifdef CONFIG_PM_SLEEP
575 .freeze = virtcrypto_freeze,
576 .restore = virtcrypto_restore,
577#endif
578};
579
580module_virtio_driver(virtio_crypto_driver);
581
582MODULE_DEVICE_TABLE(virtio, id_table);
583MODULE_DESCRIPTION("virtio crypto device driver");
584MODULE_LICENSE("GPL");
585MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");