1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Driver for Virtio crypto device.
4 * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
8 #include <linux/module.h>
9 #include <linux/virtio_config.h>
10 #include <linux/cpu.h>
12 #include <uapi/linux/virtio_crypto.h>
13 #include "virtio_crypto_common.h"
17 virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
20 kfree_sensitive(vc_req->req_data);
25 static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req)
27 complete(&vc_ctrl_req->compl);
30 static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
32 struct virtio_crypto *vcrypto = vq->vdev->priv;
33 struct virtio_crypto_ctrl_request *vc_ctrl_req;
37 spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
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);
45 if (unlikely(virtqueue_is_broken(vq)))
47 } while (!virtqueue_enable_cb(vq));
48 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
51 int 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)
58 init_completion(&vc_ctrl_req->compl);
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);
63 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
67 virtqueue_kick(vcrypto->ctrl_vq);
68 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
70 wait_for_completion(&vc_ctrl_req->compl);
75 static void virtcrypto_dataq_callback(struct virtqueue *vq)
77 struct virtio_crypto *vcrypto = vq->vdev->priv;
78 struct virtio_crypto_request *vc_req;
81 unsigned int qid = vq->index;
83 spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
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);
90 vc_req->alg_cb(vc_req, len);
92 &vcrypto->data_vq[qid].lock, flags);
94 } while (!virtqueue_enable_cb(vq));
95 spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
98 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
100 vq_callback_t **callbacks;
101 struct virtqueue **vqs;
105 struct device *dev = &vi->vdev->dev;
108 * We expect 1 data virtqueue, followed by
109 * possible N-1 data queues used in multiqueue mode,
110 * followed by control vq.
112 total_vqs = vi->max_data_queues + 1;
114 /* Allocate space for find_vqs parameters */
115 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
118 callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
121 names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
125 /* Parameters for control virtqueue */
126 callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
127 names[total_vqs - 1] = "controlq";
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),
134 names[i] = vi->data_vq[i].name;
137 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
141 vi->ctrl_vq = vqs[total_vqs - 1];
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) {
172 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
174 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
182 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
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);
190 vi->affinity_hint_set = false;
194 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
200 * In single queue mode, we don't set the cpu affinity.
202 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
203 virtcrypto_clean_affinity(vcrypto, -1);
208 * In multiqueue mode, we let the queue to be private to one cpu
209 * by setting the affinity hint to eliminate the contention.
211 * TODO: adds cpu hotplug support by register cpu notifier.
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)
220 vcrypto->affinity_hint_set = true;
223 static void virtcrypto_free_queues(struct virtio_crypto *vi)
228 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
232 /* Allocate send & receive queues */
233 ret = virtcrypto_alloc_queues(vi);
237 ret = virtcrypto_find_vqs(vi);
242 virtcrypto_set_affinity(vi);
248 virtcrypto_free_queues(vi);
253 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
258 virtio_cread_le(vcrypto->vdev,
259 struct virtio_crypto_config, status, &status);
262 * Unknown status bits would be a host error and the driver
263 * should consider the device to be broken.
265 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
266 dev_warn(&vcrypto->vdev->dev,
267 "Unknown status bits: 0x%x\n", status);
269 virtio_break_device(vcrypto->vdev);
273 if (vcrypto->status == status)
276 vcrypto->status = status;
278 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
279 err = virtcrypto_dev_start(vcrypto);
281 dev_err(&vcrypto->vdev->dev,
282 "Failed to start virtio crypto device.\n");
286 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
288 virtcrypto_dev_stop(vcrypto);
289 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
295 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
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);
312 if (vcrypto->data_vq[i].engine)
313 crypto_engine_exit(vcrypto->data_vq[i].engine);
318 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
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);
327 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
329 struct virtio_device *vdev = vcrypto->vdev;
331 virtcrypto_clean_affinity(vcrypto, -1);
333 vdev->config->del_vqs(vdev);
335 virtcrypto_free_queues(vcrypto);
338 static void vcrypto_config_changed_work(struct work_struct *work)
340 struct virtio_crypto *vcrypto =
341 container_of(work, struct virtio_crypto, config_work);
343 virtcrypto_update_status(vcrypto);
346 static int virtcrypto_probe(struct virtio_device *vdev)
349 struct virtio_crypto *vcrypto;
350 u32 max_data_queues = 0, max_cipher_key_len = 0;
351 u32 max_auth_key_len = 0;
353 u32 cipher_algo_l = 0;
354 u32 cipher_algo_h = 0;
359 u32 akcipher_algo = 0;
360 u32 crypto_services = 0;
362 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
365 if (!vdev->config->get) {
366 dev_err(&vdev->dev, "%s failure: config access disabled\n",
371 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
373 * If the accelerator is connected to a node with no memory
374 * there is no point in using the accelerator since the remote
375 * memory transaction will be very slow.
377 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
381 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
382 dev_to_node(&vdev->dev));
386 virtio_cread_le(vdev, struct virtio_crypto_config,
387 max_dataqueues, &max_data_queues);
388 if (max_data_queues < 1)
391 virtio_cread_le(vdev, struct virtio_crypto_config,
392 max_cipher_key_len, &max_cipher_key_len);
393 virtio_cread_le(vdev, struct virtio_crypto_config,
394 max_auth_key_len, &max_auth_key_len);
395 virtio_cread_le(vdev, struct virtio_crypto_config,
396 max_size, &max_size);
397 virtio_cread_le(vdev, struct virtio_crypto_config,
398 crypto_services, &crypto_services);
399 virtio_cread_le(vdev, struct virtio_crypto_config,
400 cipher_algo_l, &cipher_algo_l);
401 virtio_cread_le(vdev, struct virtio_crypto_config,
402 cipher_algo_h, &cipher_algo_h);
403 virtio_cread_le(vdev, struct virtio_crypto_config,
404 hash_algo, &hash_algo);
405 virtio_cread_le(vdev, struct virtio_crypto_config,
406 mac_algo_l, &mac_algo_l);
407 virtio_cread_le(vdev, struct virtio_crypto_config,
408 mac_algo_h, &mac_algo_h);
409 virtio_cread_le(vdev, struct virtio_crypto_config,
410 aead_algo, &aead_algo);
411 if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
412 virtio_cread_le(vdev, struct virtio_crypto_config,
413 akcipher_algo, &akcipher_algo);
415 /* Add virtio crypto device to global table */
416 err = virtcrypto_devmgr_add_dev(vcrypto);
418 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
421 vcrypto->owner = THIS_MODULE;
422 vcrypto = vdev->priv = vcrypto;
423 vcrypto->vdev = vdev;
425 spin_lock_init(&vcrypto->ctrl_lock);
427 /* Use single data queue as default */
428 vcrypto->curr_queue = 1;
429 vcrypto->max_data_queues = max_data_queues;
430 vcrypto->max_cipher_key_len = max_cipher_key_len;
431 vcrypto->max_auth_key_len = max_auth_key_len;
432 vcrypto->max_size = max_size;
433 vcrypto->crypto_services = crypto_services;
434 vcrypto->cipher_algo_l = cipher_algo_l;
435 vcrypto->cipher_algo_h = cipher_algo_h;
436 vcrypto->mac_algo_l = mac_algo_l;
437 vcrypto->mac_algo_h = mac_algo_h;
438 vcrypto->hash_algo = hash_algo;
439 vcrypto->aead_algo = aead_algo;
440 vcrypto->akcipher_algo = akcipher_algo;
443 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
444 vcrypto->max_data_queues,
445 vcrypto->max_cipher_key_len,
446 vcrypto->max_auth_key_len,
449 err = virtcrypto_init_vqs(vcrypto);
451 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
455 err = virtcrypto_start_crypto_engines(vcrypto);
459 virtio_device_ready(vdev);
461 err = virtcrypto_update_status(vcrypto);
465 INIT_WORK(&vcrypto->config_work, vcrypto_config_changed_work);
470 virtcrypto_clear_crypto_engines(vcrypto);
472 virtio_reset_device(vdev);
473 virtcrypto_del_vqs(vcrypto);
475 virtcrypto_devmgr_rm_dev(vcrypto);
481 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
483 struct virtio_crypto_request *vc_req;
485 struct virtqueue *vq;
487 for (i = 0; i < vcrypto->max_data_queues; i++) {
488 vq = vcrypto->data_vq[i].vq;
489 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
490 kfree(vc_req->req_data);
497 static void virtcrypto_remove(struct virtio_device *vdev)
499 struct virtio_crypto *vcrypto = vdev->priv;
501 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
503 flush_work(&vcrypto->config_work);
504 if (virtcrypto_dev_started(vcrypto))
505 virtcrypto_dev_stop(vcrypto);
506 virtio_reset_device(vdev);
507 virtcrypto_free_unused_reqs(vcrypto);
508 virtcrypto_clear_crypto_engines(vcrypto);
509 virtcrypto_del_vqs(vcrypto);
510 virtcrypto_devmgr_rm_dev(vcrypto);
514 static void virtcrypto_config_changed(struct virtio_device *vdev)
516 struct virtio_crypto *vcrypto = vdev->priv;
518 schedule_work(&vcrypto->config_work);
521 #ifdef CONFIG_PM_SLEEP
522 static int virtcrypto_freeze(struct virtio_device *vdev)
524 struct virtio_crypto *vcrypto = vdev->priv;
526 flush_work(&vcrypto->config_work);
527 virtio_reset_device(vdev);
528 virtcrypto_free_unused_reqs(vcrypto);
529 if (virtcrypto_dev_started(vcrypto))
530 virtcrypto_dev_stop(vcrypto);
532 virtcrypto_clear_crypto_engines(vcrypto);
533 virtcrypto_del_vqs(vcrypto);
537 static int virtcrypto_restore(struct virtio_device *vdev)
539 struct virtio_crypto *vcrypto = vdev->priv;
542 err = virtcrypto_init_vqs(vcrypto);
546 err = virtcrypto_start_crypto_engines(vcrypto);
550 virtio_device_ready(vdev);
552 err = virtcrypto_dev_start(vcrypto);
554 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
561 virtcrypto_clear_crypto_engines(vcrypto);
563 virtio_reset_device(vdev);
564 virtcrypto_del_vqs(vcrypto);
569 static const unsigned int features[] = {
573 static const struct virtio_device_id id_table[] = {
574 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
578 static struct virtio_driver virtio_crypto_driver = {
579 .driver.name = KBUILD_MODNAME,
580 .driver.owner = THIS_MODULE,
581 .feature_table = features,
582 .feature_table_size = ARRAY_SIZE(features),
583 .id_table = id_table,
584 .probe = virtcrypto_probe,
585 .remove = virtcrypto_remove,
586 .config_changed = virtcrypto_config_changed,
587 #ifdef CONFIG_PM_SLEEP
588 .freeze = virtcrypto_freeze,
589 .restore = virtcrypto_restore,
593 module_virtio_driver(virtio_crypto_driver);
595 MODULE_DEVICE_TABLE(virtio, id_table);
596 MODULE_DESCRIPTION("virtio crypto device driver");
597 MODULE_LICENSE("GPL");
598 MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");