summaryrefslogtreecommitdiff
path: root/drivers/crypto/virtio/virtio_crypto_core.c
blob: 8e977b7627cb74879f1c3630b20abd96af0d3451 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
// SPDX-License-Identifier: GPL-2.0-or-later
 /* Driver for Virtio crypto device.
  *
  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
  */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/virtio_config.h>
#include <linux/cpu.h>

#include <uapi/linux/virtio_crypto.h>
#include "virtio_crypto_common.h"


void
virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
{
	if (vc_req) {
		kfree_sensitive(vc_req->req_data);
		kfree(vc_req->sgs);
	}
}

static void virtcrypto_dataq_callback(struct virtqueue *vq)
{
	struct virtio_crypto *vcrypto = vq->vdev->priv;
	struct virtio_crypto_request *vc_req;
	unsigned long flags;
	unsigned int len;
	unsigned int qid = vq->index;

	spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
	do {
		virtqueue_disable_cb(vq);
		while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
			spin_unlock_irqrestore(
				&vcrypto->data_vq[qid].lock, flags);
			if (vc_req->alg_cb)
				vc_req->alg_cb(vc_req, len);
			spin_lock_irqsave(
				&vcrypto->data_vq[qid].lock, flags);
		}
	} while (!virtqueue_enable_cb(vq));
	spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
}

static int virtcrypto_find_vqs(struct virtio_crypto *vi)
{
	vq_callback_t **callbacks;
	struct virtqueue **vqs;
	int ret = -ENOMEM;
	int i, total_vqs;
	const char **names;
	struct device *dev = &vi->vdev->dev;

	/*
	 * We expect 1 data virtqueue, followed by
	 * possible N-1 data queues used in multiqueue mode,
	 * followed by control vq.
	 */
	total_vqs = vi->max_data_queues + 1;

	/* Allocate space for find_vqs parameters */
	vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
	if (!vqs)
		goto err_vq;
	callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
	if (!callbacks)
		goto err_callback;
	names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
	if (!names)
		goto err_names;

	/* Parameters for control virtqueue */
	callbacks[total_vqs - 1] = NULL;
	names[total_vqs - 1] = "controlq";

	/* Allocate/initialize parameters for data virtqueues */
	for (i = 0; i < vi->max_data_queues; i++) {
		callbacks[i] = virtcrypto_dataq_callback;
		snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
				"dataq.%d", i);
		names[i] = vi->data_vq[i].name;
	}

	ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
	if (ret)
		goto err_find;

	vi->ctrl_vq = vqs[total_vqs - 1];

	for (i = 0; i < vi->max_data_queues; i++) {
		spin_lock_init(&vi->data_vq[i].lock);
		vi->data_vq[i].vq = vqs[i];
		/* Initialize crypto engine */
		vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
		if (!vi->data_vq[i].engine) {
			ret = -ENOMEM;
			goto err_engine;
		}
	}

	kfree(names);
	kfree(callbacks);
	kfree(vqs);

	return 0;

err_engine:
err_find:
	kfree(names);
err_names:
	kfree(callbacks);
err_callback:
	kfree(vqs);
err_vq:
	return ret;
}

static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
{
	vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
				GFP_KERNEL);
	if (!vi->data_vq)
		return -ENOMEM;

	return 0;
}

static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
{
	int i;

	if (vi->affinity_hint_set) {
		for (i = 0; i < vi->max_data_queues; i++)
			virtqueue_set_affinity(vi->data_vq[i].vq, NULL);

		vi->affinity_hint_set = false;
	}
}

static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
{
	int i = 0;
	int cpu;

	/*
	 * In single queue mode, we don't set the cpu affinity.
	 */
	if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
		virtcrypto_clean_affinity(vcrypto, -1);
		return;
	}

	/*
	 * In multiqueue mode, we let the queue to be private to one cpu
	 * by setting the affinity hint to eliminate the contention.
	 *
	 * TODO: adds cpu hotplug support by register cpu notifier.
	 *
	 */
	for_each_online_cpu(cpu) {
		virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
		if (++i >= vcrypto->max_data_queues)
			break;
	}

	vcrypto->affinity_hint_set = true;
}

static void virtcrypto_free_queues(struct virtio_crypto *vi)
{
	kfree(vi->data_vq);
}

static int virtcrypto_init_vqs(struct virtio_crypto *vi)
{
	int ret;

	/* Allocate send & receive queues */
	ret = virtcrypto_alloc_queues(vi);
	if (ret)
		goto err;

	ret = virtcrypto_find_vqs(vi);
	if (ret)
		goto err_free;

	cpus_read_lock();
	virtcrypto_set_affinity(vi);
	cpus_read_unlock();

	return 0;

err_free:
	virtcrypto_free_queues(vi);
err:
	return ret;
}

static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
{
	u32 status;
	int err;

	virtio_cread_le(vcrypto->vdev,
			struct virtio_crypto_config, status, &status);

	/*
	 * Unknown status bits would be a host error and the driver
	 * should consider the device to be broken.
	 */
	if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
		dev_warn(&vcrypto->vdev->dev,
				"Unknown status bits: 0x%x\n", status);

		virtio_break_device(vcrypto->vdev);
		return -EPERM;
	}

	if (vcrypto->status == status)
		return 0;

	vcrypto->status = status;

	if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
		err = virtcrypto_dev_start(vcrypto);
		if (err) {
			dev_err(&vcrypto->vdev->dev,
				"Failed to start virtio crypto device.\n");

			return -EPERM;
		}
		dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
	} else {
		virtcrypto_dev_stop(vcrypto);
		dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
	}

	return 0;
}

static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
{
	int32_t i;
	int ret;

	for (i = 0; i < vcrypto->max_data_queues; i++) {
		if (vcrypto->data_vq[i].engine) {
			ret = crypto_engine_start(vcrypto->data_vq[i].engine);
			if (ret)
				goto err;
		}
	}

	return 0;

err:
	while (--i >= 0)
		if (vcrypto->data_vq[i].engine)
			crypto_engine_exit(vcrypto->data_vq[i].engine);

	return ret;
}

static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
{
	u32 i;

	for (i = 0; i < vcrypto->max_data_queues; i++)
		if (vcrypto->data_vq[i].engine)
			crypto_engine_exit(vcrypto->data_vq[i].engine);
}

static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
{
	struct virtio_device *vdev = vcrypto->vdev;

	virtcrypto_clean_affinity(vcrypto, -1);

	vdev->config->del_vqs(vdev);

	virtcrypto_free_queues(vcrypto);
}

static int virtcrypto_probe(struct virtio_device *vdev)
{
	int err = -EFAULT;
	struct virtio_crypto *vcrypto;
	u32 max_data_queues = 0, max_cipher_key_len = 0;
	u32 max_auth_key_len = 0;
	u64 max_size = 0;
	u32 cipher_algo_l = 0;
	u32 cipher_algo_h = 0;
	u32 hash_algo = 0;
	u32 mac_algo_l = 0;
	u32 mac_algo_h = 0;
	u32 aead_algo = 0;
	u32 crypto_services = 0;

	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
		return -ENODEV;

	if (!vdev->config->get) {
		dev_err(&vdev->dev, "%s failure: config access disabled\n",
			__func__);
		return -EINVAL;
	}

	if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
		/*
		 * If the accelerator is connected to a node with no memory
		 * there is no point in using the accelerator since the remote
		 * memory transaction will be very slow.
		 */
		dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
		return -EINVAL;
	}

	vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
					dev_to_node(&vdev->dev));
	if (!vcrypto)
		return -ENOMEM;

	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_dataqueues, &max_data_queues);
	if (max_data_queues < 1)
		max_data_queues = 1;

	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_cipher_key_len, &max_cipher_key_len);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_auth_key_len, &max_auth_key_len);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			max_size, &max_size);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			crypto_services, &crypto_services);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			cipher_algo_l, &cipher_algo_l);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			cipher_algo_h, &cipher_algo_h);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			hash_algo, &hash_algo);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			mac_algo_l, &mac_algo_l);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			mac_algo_h, &mac_algo_h);
	virtio_cread_le(vdev, struct virtio_crypto_config,
			aead_algo, &aead_algo);

	/* Add virtio crypto device to global table */
	err = virtcrypto_devmgr_add_dev(vcrypto);
	if (err) {
		dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
		goto free;
	}
	vcrypto->owner = THIS_MODULE;
	vcrypto = vdev->priv = vcrypto;
	vcrypto->vdev = vdev;

	spin_lock_init(&vcrypto->ctrl_lock);

	/* Use single data queue as default */
	vcrypto->curr_queue = 1;
	vcrypto->max_data_queues = max_data_queues;
	vcrypto->max_cipher_key_len = max_cipher_key_len;
	vcrypto->max_auth_key_len = max_auth_key_len;
	vcrypto->max_size = max_size;
	vcrypto->crypto_services = crypto_services;
	vcrypto->cipher_algo_l = cipher_algo_l;
	vcrypto->cipher_algo_h = cipher_algo_h;
	vcrypto->mac_algo_l = mac_algo_l;
	vcrypto->mac_algo_h = mac_algo_h;
	vcrypto->hash_algo = hash_algo;
	vcrypto->aead_algo = aead_algo;


	dev_info(&vdev->dev,
		"max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
		vcrypto->max_data_queues,
		vcrypto->max_cipher_key_len,
		vcrypto->max_auth_key_len,
		vcrypto->max_size);

	err = virtcrypto_init_vqs(vcrypto);
	if (err) {
		dev_err(&vdev->dev, "Failed to initialize vqs.\n");
		goto free_dev;
	}

	err = virtcrypto_start_crypto_engines(vcrypto);
	if (err)
		goto free_vqs;

	virtio_device_ready(vdev);

	err = virtcrypto_update_status(vcrypto);
	if (err)
		goto free_engines;

	return 0;

free_engines:
	virtcrypto_clear_crypto_engines(vcrypto);
free_vqs:
	virtio_reset_device(vdev);
	virtcrypto_del_vqs(vcrypto);
free_dev:
	virtcrypto_devmgr_rm_dev(vcrypto);
free:
	kfree(vcrypto);
	return err;
}

static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
{
	struct virtio_crypto_request *vc_req;
	int i;
	struct virtqueue *vq;

	for (i = 0; i < vcrypto->max_data_queues; i++) {
		vq = vcrypto->data_vq[i].vq;
		while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
			kfree(vc_req->req_data);
			kfree(vc_req->sgs);
		}
	}
}

static void virtcrypto_remove(struct virtio_device *vdev)
{
	struct virtio_crypto *vcrypto = vdev->priv;

	dev_info(&vdev->dev, "Start virtcrypto_remove.\n");

	if (virtcrypto_dev_started(vcrypto))
		virtcrypto_dev_stop(vcrypto);
	virtio_reset_device(vdev);
	virtcrypto_free_unused_reqs(vcrypto);
	virtcrypto_clear_crypto_engines(vcrypto);
	virtcrypto_del_vqs(vcrypto);
	virtcrypto_devmgr_rm_dev(vcrypto);
	kfree(vcrypto);
}

static void virtcrypto_config_changed(struct virtio_device *vdev)
{
	struct virtio_crypto *vcrypto = vdev->priv;

	virtcrypto_update_status(vcrypto);
}

#ifdef CONFIG_PM_SLEEP
static int virtcrypto_freeze(struct virtio_device *vdev)
{
	struct virtio_crypto *vcrypto = vdev->priv;

	virtio_reset_device(vdev);
	virtcrypto_free_unused_reqs(vcrypto);
	if (virtcrypto_dev_started(vcrypto))
		virtcrypto_dev_stop(vcrypto);

	virtcrypto_clear_crypto_engines(vcrypto);
	virtcrypto_del_vqs(vcrypto);
	return 0;
}

static int virtcrypto_restore(struct virtio_device *vdev)
{
	struct virtio_crypto *vcrypto = vdev->priv;
	int err;

	err = virtcrypto_init_vqs(vcrypto);
	if (err)
		return err;

	err = virtcrypto_start_crypto_engines(vcrypto);
	if (err)
		goto free_vqs;

	virtio_device_ready(vdev);

	err = virtcrypto_dev_start(vcrypto);
	if (err) {
		dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
		goto free_engines;
	}

	return 0;

free_engines:
	virtcrypto_clear_crypto_engines(vcrypto);
free_vqs:
	virtio_reset_device(vdev);
	virtcrypto_del_vqs(vcrypto);
	return err;
}
#endif

static const unsigned int features[] = {
	/* none */
};

static const struct virtio_device_id id_table[] = {
	{ VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
	{ 0 },
};

static struct virtio_driver virtio_crypto_driver = {
	.driver.name         = KBUILD_MODNAME,
	.driver.owner        = THIS_MODULE,
	.feature_table       = features,
	.feature_table_size  = ARRAY_SIZE(features),
	.id_table            = id_table,
	.probe               = virtcrypto_probe,
	.remove              = virtcrypto_remove,
	.config_changed = virtcrypto_config_changed,
#ifdef CONFIG_PM_SLEEP
	.freeze = virtcrypto_freeze,
	.restore = virtcrypto_restore,
#endif
};

module_virtio_driver(virtio_crypto_driver);

MODULE_DEVICE_TABLE(virtio, id_table);
MODULE_DESCRIPTION("virtio crypto device driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");