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 } while (!virtqueue_enable_cb(vq));
46 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
49 int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct scatterlist *sgs[],
50 unsigned int out_sgs, unsigned int in_sgs,
51 struct virtio_crypto_ctrl_request *vc_ctrl_req)
56 init_completion(&vc_ctrl_req->compl);
58 spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
59 err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, out_sgs, in_sgs, vc_ctrl_req, GFP_ATOMIC);
61 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
65 virtqueue_kick(vcrypto->ctrl_vq);
66 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
68 wait_for_completion(&vc_ctrl_req->compl);
73 static void virtcrypto_done_task(unsigned long data)
75 struct data_queue *data_vq = (struct data_queue *)data;
76 struct virtqueue *vq = data_vq->vq;
77 struct virtio_crypto_request *vc_req;
81 virtqueue_disable_cb(vq);
82 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
84 vc_req->alg_cb(vc_req, len);
86 } while (!virtqueue_enable_cb(vq));
89 static void virtcrypto_dataq_callback(struct virtqueue *vq)
91 struct virtio_crypto *vcrypto = vq->vdev->priv;
92 struct data_queue *dq = &vcrypto->data_vq[vq->index];
94 tasklet_schedule(&dq->done_task);
97 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
99 vq_callback_t **callbacks;
100 struct virtqueue **vqs;
104 struct device *dev = &vi->vdev->dev;
107 * We expect 1 data virtqueue, followed by
108 * possible N-1 data queues used in multiqueue mode,
109 * followed by control vq.
111 total_vqs = vi->max_data_queues + 1;
113 /* Allocate space for find_vqs parameters */
114 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
117 callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
120 names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
124 /* Parameters for control virtqueue */
125 callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
126 names[total_vqs - 1] = "controlq";
128 /* Allocate/initialize parameters for data virtqueues */
129 for (i = 0; i < vi->max_data_queues; i++) {
130 callbacks[i] = virtcrypto_dataq_callback;
131 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
133 names[i] = vi->data_vq[i].name;
136 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
140 vi->ctrl_vq = vqs[total_vqs - 1];
142 for (i = 0; i < vi->max_data_queues; i++) {
143 spin_lock_init(&vi->data_vq[i].lock);
144 vi->data_vq[i].vq = vqs[i];
145 /* Initialize crypto engine */
146 vi->data_vq[i].engine = crypto_engine_alloc_init_and_set(dev, true, NULL, true,
147 virtqueue_get_vring_size(vqs[i]));
148 if (!vi->data_vq[i].engine) {
152 tasklet_init(&vi->data_vq[i].done_task, virtcrypto_done_task,
153 (unsigned long)&vi->data_vq[i]);
173 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
175 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
183 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
187 if (vi->affinity_hint_set) {
188 for (i = 0; i < vi->max_data_queues; i++)
189 virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
191 vi->affinity_hint_set = false;
195 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
201 * In single queue mode, we don't set the cpu affinity.
203 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
204 virtcrypto_clean_affinity(vcrypto, -1);
209 * In multiqueue mode, we let the queue to be private to one cpu
210 * by setting the affinity hint to eliminate the contention.
212 * TODO: adds cpu hotplug support by register cpu notifier.
215 for_each_online_cpu(cpu) {
216 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
217 if (++i >= vcrypto->max_data_queues)
221 vcrypto->affinity_hint_set = true;
224 static void virtcrypto_free_queues(struct virtio_crypto *vi)
229 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
233 /* Allocate send & receive queues */
234 ret = virtcrypto_alloc_queues(vi);
238 ret = virtcrypto_find_vqs(vi);
243 virtcrypto_set_affinity(vi);
249 virtcrypto_free_queues(vi);
254 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
259 virtio_cread_le(vcrypto->vdev,
260 struct virtio_crypto_config, status, &status);
263 * Unknown status bits would be a host error and the driver
264 * should consider the device to be broken.
266 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
267 dev_warn(&vcrypto->vdev->dev,
268 "Unknown status bits: 0x%x\n", status);
270 virtio_break_device(vcrypto->vdev);
274 if (vcrypto->status == status)
277 vcrypto->status = status;
279 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
280 err = virtcrypto_dev_start(vcrypto);
282 dev_err(&vcrypto->vdev->dev,
283 "Failed to start virtio crypto device.\n");
287 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
289 virtcrypto_dev_stop(vcrypto);
290 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
296 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
301 for (i = 0; i < vcrypto->max_data_queues; i++) {
302 if (vcrypto->data_vq[i].engine) {
303 ret = crypto_engine_start(vcrypto->data_vq[i].engine);
313 if (vcrypto->data_vq[i].engine)
314 crypto_engine_exit(vcrypto->data_vq[i].engine);
319 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
323 for (i = 0; i < vcrypto->max_data_queues; i++)
324 if (vcrypto->data_vq[i].engine)
325 crypto_engine_exit(vcrypto->data_vq[i].engine);
328 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
330 struct virtio_device *vdev = vcrypto->vdev;
332 virtcrypto_clean_affinity(vcrypto, -1);
334 vdev->config->del_vqs(vdev);
336 virtcrypto_free_queues(vcrypto);
339 static void vcrypto_config_changed_work(struct work_struct *work)
341 struct virtio_crypto *vcrypto =
342 container_of(work, struct virtio_crypto, config_work);
344 virtcrypto_update_status(vcrypto);
347 static int virtcrypto_probe(struct virtio_device *vdev)
350 struct virtio_crypto *vcrypto;
351 u32 max_data_queues = 0, max_cipher_key_len = 0;
352 u32 max_auth_key_len = 0;
354 u32 cipher_algo_l = 0;
355 u32 cipher_algo_h = 0;
360 u32 akcipher_algo = 0;
361 u32 crypto_services = 0;
363 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
366 if (!vdev->config->get) {
367 dev_err(&vdev->dev, "%s failure: config access disabled\n",
372 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
374 * If the accelerator is connected to a node with no memory
375 * there is no point in using the accelerator since the remote
376 * memory transaction will be very slow.
378 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
382 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
383 dev_to_node(&vdev->dev));
387 virtio_cread_le(vdev, struct virtio_crypto_config,
388 max_dataqueues, &max_data_queues);
389 if (max_data_queues < 1)
392 virtio_cread_le(vdev, struct virtio_crypto_config,
393 max_cipher_key_len, &max_cipher_key_len);
394 virtio_cread_le(vdev, struct virtio_crypto_config,
395 max_auth_key_len, &max_auth_key_len);
396 virtio_cread_le(vdev, struct virtio_crypto_config,
397 max_size, &max_size);
398 virtio_cread_le(vdev, struct virtio_crypto_config,
399 crypto_services, &crypto_services);
400 virtio_cread_le(vdev, struct virtio_crypto_config,
401 cipher_algo_l, &cipher_algo_l);
402 virtio_cread_le(vdev, struct virtio_crypto_config,
403 cipher_algo_h, &cipher_algo_h);
404 virtio_cread_le(vdev, struct virtio_crypto_config,
405 hash_algo, &hash_algo);
406 virtio_cread_le(vdev, struct virtio_crypto_config,
407 mac_algo_l, &mac_algo_l);
408 virtio_cread_le(vdev, struct virtio_crypto_config,
409 mac_algo_h, &mac_algo_h);
410 virtio_cread_le(vdev, struct virtio_crypto_config,
411 aead_algo, &aead_algo);
412 if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
413 virtio_cread_le(vdev, struct virtio_crypto_config,
414 akcipher_algo, &akcipher_algo);
416 /* Add virtio crypto device to global table */
417 err = virtcrypto_devmgr_add_dev(vcrypto);
419 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
422 vcrypto->owner = THIS_MODULE;
423 vcrypto = vdev->priv = vcrypto;
424 vcrypto->vdev = vdev;
426 spin_lock_init(&vcrypto->ctrl_lock);
428 /* Use single data queue as default */
429 vcrypto->curr_queue = 1;
430 vcrypto->max_data_queues = max_data_queues;
431 vcrypto->max_cipher_key_len = max_cipher_key_len;
432 vcrypto->max_auth_key_len = max_auth_key_len;
433 vcrypto->max_size = max_size;
434 vcrypto->crypto_services = crypto_services;
435 vcrypto->cipher_algo_l = cipher_algo_l;
436 vcrypto->cipher_algo_h = cipher_algo_h;
437 vcrypto->mac_algo_l = mac_algo_l;
438 vcrypto->mac_algo_h = mac_algo_h;
439 vcrypto->hash_algo = hash_algo;
440 vcrypto->aead_algo = aead_algo;
441 vcrypto->akcipher_algo = akcipher_algo;
444 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
445 vcrypto->max_data_queues,
446 vcrypto->max_cipher_key_len,
447 vcrypto->max_auth_key_len,
450 err = virtcrypto_init_vqs(vcrypto);
452 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
456 err = virtcrypto_start_crypto_engines(vcrypto);
460 virtio_device_ready(vdev);
462 err = virtcrypto_update_status(vcrypto);
466 INIT_WORK(&vcrypto->config_work, vcrypto_config_changed_work);
471 virtcrypto_clear_crypto_engines(vcrypto);
473 virtio_reset_device(vdev);
474 virtcrypto_del_vqs(vcrypto);
476 virtcrypto_devmgr_rm_dev(vcrypto);
482 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
484 struct virtio_crypto_request *vc_req;
486 struct virtqueue *vq;
488 for (i = 0; i < vcrypto->max_data_queues; i++) {
489 vq = vcrypto->data_vq[i].vq;
490 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
491 kfree(vc_req->req_data);
498 static void virtcrypto_remove(struct virtio_device *vdev)
500 struct virtio_crypto *vcrypto = vdev->priv;
503 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
505 flush_work(&vcrypto->config_work);
506 if (virtcrypto_dev_started(vcrypto))
507 virtcrypto_dev_stop(vcrypto);
508 for (i = 0; i < vcrypto->max_data_queues; i++)
509 tasklet_kill(&vcrypto->data_vq[i].done_task);
510 virtio_reset_device(vdev);
511 virtcrypto_free_unused_reqs(vcrypto);
512 virtcrypto_clear_crypto_engines(vcrypto);
513 virtcrypto_del_vqs(vcrypto);
514 virtcrypto_devmgr_rm_dev(vcrypto);
518 static void virtcrypto_config_changed(struct virtio_device *vdev)
520 struct virtio_crypto *vcrypto = vdev->priv;
522 schedule_work(&vcrypto->config_work);
525 #ifdef CONFIG_PM_SLEEP
526 static int virtcrypto_freeze(struct virtio_device *vdev)
528 struct virtio_crypto *vcrypto = vdev->priv;
530 flush_work(&vcrypto->config_work);
531 virtio_reset_device(vdev);
532 virtcrypto_free_unused_reqs(vcrypto);
533 if (virtcrypto_dev_started(vcrypto))
534 virtcrypto_dev_stop(vcrypto);
536 virtcrypto_clear_crypto_engines(vcrypto);
537 virtcrypto_del_vqs(vcrypto);
541 static int virtcrypto_restore(struct virtio_device *vdev)
543 struct virtio_crypto *vcrypto = vdev->priv;
546 err = virtcrypto_init_vqs(vcrypto);
550 err = virtcrypto_start_crypto_engines(vcrypto);
554 virtio_device_ready(vdev);
556 err = virtcrypto_dev_start(vcrypto);
558 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
565 virtcrypto_clear_crypto_engines(vcrypto);
567 virtio_reset_device(vdev);
568 virtcrypto_del_vqs(vcrypto);
573 static const unsigned int features[] = {
577 static const struct virtio_device_id id_table[] = {
578 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
582 static struct virtio_driver virtio_crypto_driver = {
583 .driver.name = KBUILD_MODNAME,
584 .driver.owner = THIS_MODULE,
585 .feature_table = features,
586 .feature_table_size = ARRAY_SIZE(features),
587 .id_table = id_table,
588 .probe = virtcrypto_probe,
589 .remove = virtcrypto_remove,
590 .config_changed = virtcrypto_config_changed,
591 #ifdef CONFIG_PM_SLEEP
592 .freeze = virtcrypto_freeze,
593 .restore = virtcrypto_restore,
597 module_virtio_driver(virtio_crypto_driver);
599 MODULE_DEVICE_TABLE(virtio, id_table);
600 MODULE_DESCRIPTION("virtio crypto device driver");
601 MODULE_LICENSE("GPL");
602 MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");