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 struct virtqueue_info *vqs_info;
100 struct virtqueue **vqs;
103 struct device *dev = &vi->vdev->dev;
106 * We expect 1 data virtqueue, followed by
107 * possible N-1 data queues used in multiqueue mode,
108 * followed by control vq.
110 total_vqs = vi->max_data_queues + 1;
112 /* Allocate space for find_vqs parameters */
113 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
116 vqs_info = kcalloc(total_vqs, sizeof(*vqs_info), GFP_KERNEL);
120 /* Parameters for control virtqueue */
121 vqs_info[total_vqs - 1].callback = virtcrypto_ctrlq_callback;
122 vqs_info[total_vqs - 1].name = "controlq";
124 /* Allocate/initialize parameters for data virtqueues */
125 for (i = 0; i < vi->max_data_queues; i++) {
126 vqs_info[i].callback = virtcrypto_dataq_callback;
127 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
129 vqs_info[i].name = vi->data_vq[i].name;
132 ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, vqs_info, NULL);
136 vi->ctrl_vq = vqs[total_vqs - 1];
138 for (i = 0; i < vi->max_data_queues; i++) {
139 spin_lock_init(&vi->data_vq[i].lock);
140 vi->data_vq[i].vq = vqs[i];
141 /* Initialize crypto engine */
142 vi->data_vq[i].engine = crypto_engine_alloc_init_and_set(dev, true, NULL, true,
143 virtqueue_get_vring_size(vqs[i]));
144 if (!vi->data_vq[i].engine) {
148 tasklet_init(&vi->data_vq[i].done_task, virtcrypto_done_task,
149 (unsigned long)&vi->data_vq[i]);
166 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
168 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
176 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
180 if (vi->affinity_hint_set) {
181 for (i = 0; i < vi->max_data_queues; i++)
182 virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
184 vi->affinity_hint_set = false;
188 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
194 * In single queue mode, we don't set the cpu affinity.
196 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
197 virtcrypto_clean_affinity(vcrypto, -1);
202 * In multiqueue mode, we let the queue to be private to one cpu
203 * by setting the affinity hint to eliminate the contention.
205 * TODO: adds cpu hotplug support by register cpu notifier.
208 for_each_online_cpu(cpu) {
209 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
210 if (++i >= vcrypto->max_data_queues)
214 vcrypto->affinity_hint_set = true;
217 static void virtcrypto_free_queues(struct virtio_crypto *vi)
222 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
226 /* Allocate send & receive queues */
227 ret = virtcrypto_alloc_queues(vi);
231 ret = virtcrypto_find_vqs(vi);
236 virtcrypto_set_affinity(vi);
242 virtcrypto_free_queues(vi);
247 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
252 virtio_cread_le(vcrypto->vdev,
253 struct virtio_crypto_config, status, &status);
256 * Unknown status bits would be a host error and the driver
257 * should consider the device to be broken.
259 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
260 dev_warn(&vcrypto->vdev->dev,
261 "Unknown status bits: 0x%x\n", status);
263 virtio_break_device(vcrypto->vdev);
267 if (vcrypto->status == status)
270 vcrypto->status = status;
272 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
273 err = virtcrypto_dev_start(vcrypto);
275 dev_err(&vcrypto->vdev->dev,
276 "Failed to start virtio crypto device.\n");
280 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
282 virtcrypto_dev_stop(vcrypto);
283 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
289 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
294 for (i = 0; i < vcrypto->max_data_queues; i++) {
295 if (vcrypto->data_vq[i].engine) {
296 ret = crypto_engine_start(vcrypto->data_vq[i].engine);
306 if (vcrypto->data_vq[i].engine)
307 crypto_engine_exit(vcrypto->data_vq[i].engine);
312 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
316 for (i = 0; i < vcrypto->max_data_queues; i++)
317 if (vcrypto->data_vq[i].engine)
318 crypto_engine_exit(vcrypto->data_vq[i].engine);
321 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
323 struct virtio_device *vdev = vcrypto->vdev;
325 virtcrypto_clean_affinity(vcrypto, -1);
327 vdev->config->del_vqs(vdev);
329 virtcrypto_free_queues(vcrypto);
332 static void vcrypto_config_changed_work(struct work_struct *work)
334 struct virtio_crypto *vcrypto =
335 container_of(work, struct virtio_crypto, config_work);
337 virtcrypto_update_status(vcrypto);
340 static int virtcrypto_probe(struct virtio_device *vdev)
343 struct virtio_crypto *vcrypto;
344 u32 max_data_queues = 0, max_cipher_key_len = 0;
345 u32 max_auth_key_len = 0;
347 u32 cipher_algo_l = 0;
348 u32 cipher_algo_h = 0;
353 u32 akcipher_algo = 0;
354 u32 crypto_services = 0;
356 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
359 if (!vdev->config->get) {
360 dev_err(&vdev->dev, "%s failure: config access disabled\n",
365 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
367 * If the accelerator is connected to a node with no memory
368 * there is no point in using the accelerator since the remote
369 * memory transaction will be very slow.
371 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
375 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
376 dev_to_node(&vdev->dev));
380 virtio_cread_le(vdev, struct virtio_crypto_config,
381 max_dataqueues, &max_data_queues);
382 if (max_data_queues < 1)
385 virtio_cread_le(vdev, struct virtio_crypto_config,
386 max_cipher_key_len, &max_cipher_key_len);
387 virtio_cread_le(vdev, struct virtio_crypto_config,
388 max_auth_key_len, &max_auth_key_len);
389 virtio_cread_le(vdev, struct virtio_crypto_config,
390 max_size, &max_size);
391 virtio_cread_le(vdev, struct virtio_crypto_config,
392 crypto_services, &crypto_services);
393 virtio_cread_le(vdev, struct virtio_crypto_config,
394 cipher_algo_l, &cipher_algo_l);
395 virtio_cread_le(vdev, struct virtio_crypto_config,
396 cipher_algo_h, &cipher_algo_h);
397 virtio_cread_le(vdev, struct virtio_crypto_config,
398 hash_algo, &hash_algo);
399 virtio_cread_le(vdev, struct virtio_crypto_config,
400 mac_algo_l, &mac_algo_l);
401 virtio_cread_le(vdev, struct virtio_crypto_config,
402 mac_algo_h, &mac_algo_h);
403 virtio_cread_le(vdev, struct virtio_crypto_config,
404 aead_algo, &aead_algo);
405 if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
406 virtio_cread_le(vdev, struct virtio_crypto_config,
407 akcipher_algo, &akcipher_algo);
409 /* Add virtio crypto device to global table */
410 err = virtcrypto_devmgr_add_dev(vcrypto);
412 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
415 vcrypto->owner = THIS_MODULE;
416 vcrypto = vdev->priv = vcrypto;
417 vcrypto->vdev = vdev;
419 spin_lock_init(&vcrypto->ctrl_lock);
421 /* Use single data queue as default */
422 vcrypto->curr_queue = 1;
423 vcrypto->max_data_queues = max_data_queues;
424 vcrypto->max_cipher_key_len = max_cipher_key_len;
425 vcrypto->max_auth_key_len = max_auth_key_len;
426 vcrypto->max_size = max_size;
427 vcrypto->crypto_services = crypto_services;
428 vcrypto->cipher_algo_l = cipher_algo_l;
429 vcrypto->cipher_algo_h = cipher_algo_h;
430 vcrypto->mac_algo_l = mac_algo_l;
431 vcrypto->mac_algo_h = mac_algo_h;
432 vcrypto->hash_algo = hash_algo;
433 vcrypto->aead_algo = aead_algo;
434 vcrypto->akcipher_algo = akcipher_algo;
437 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
438 vcrypto->max_data_queues,
439 vcrypto->max_cipher_key_len,
440 vcrypto->max_auth_key_len,
443 err = virtcrypto_init_vqs(vcrypto);
445 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
449 err = virtcrypto_start_crypto_engines(vcrypto);
453 virtio_device_ready(vdev);
455 err = virtcrypto_update_status(vcrypto);
459 INIT_WORK(&vcrypto->config_work, vcrypto_config_changed_work);
464 virtcrypto_clear_crypto_engines(vcrypto);
466 virtio_reset_device(vdev);
467 virtcrypto_del_vqs(vcrypto);
469 virtcrypto_devmgr_rm_dev(vcrypto);
475 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
477 struct virtio_crypto_request *vc_req;
479 struct virtqueue *vq;
481 for (i = 0; i < vcrypto->max_data_queues; i++) {
482 vq = vcrypto->data_vq[i].vq;
483 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
484 kfree(vc_req->req_data);
491 static void virtcrypto_remove(struct virtio_device *vdev)
493 struct virtio_crypto *vcrypto = vdev->priv;
496 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
498 flush_work(&vcrypto->config_work);
499 if (virtcrypto_dev_started(vcrypto))
500 virtcrypto_dev_stop(vcrypto);
501 for (i = 0; i < vcrypto->max_data_queues; i++)
502 tasklet_kill(&vcrypto->data_vq[i].done_task);
503 virtio_reset_device(vdev);
504 virtcrypto_free_unused_reqs(vcrypto);
505 virtcrypto_clear_crypto_engines(vcrypto);
506 virtcrypto_del_vqs(vcrypto);
507 virtcrypto_devmgr_rm_dev(vcrypto);
511 static void virtcrypto_config_changed(struct virtio_device *vdev)
513 struct virtio_crypto *vcrypto = vdev->priv;
515 schedule_work(&vcrypto->config_work);
518 #ifdef CONFIG_PM_SLEEP
519 static int virtcrypto_freeze(struct virtio_device *vdev)
521 struct virtio_crypto *vcrypto = vdev->priv;
523 flush_work(&vcrypto->config_work);
524 virtio_reset_device(vdev);
525 virtcrypto_free_unused_reqs(vcrypto);
526 if (virtcrypto_dev_started(vcrypto))
527 virtcrypto_dev_stop(vcrypto);
529 virtcrypto_clear_crypto_engines(vcrypto);
530 virtcrypto_del_vqs(vcrypto);
534 static int virtcrypto_restore(struct virtio_device *vdev)
536 struct virtio_crypto *vcrypto = vdev->priv;
539 err = virtcrypto_init_vqs(vcrypto);
543 err = virtcrypto_start_crypto_engines(vcrypto);
547 virtio_device_ready(vdev);
549 err = virtcrypto_dev_start(vcrypto);
551 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
558 virtcrypto_clear_crypto_engines(vcrypto);
560 virtio_reset_device(vdev);
561 virtcrypto_del_vqs(vcrypto);
566 static const unsigned int features[] = {
570 static const struct virtio_device_id id_table[] = {
571 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
575 static struct virtio_driver virtio_crypto_driver = {
576 .driver.name = KBUILD_MODNAME,
577 .feature_table = features,
578 .feature_table_size = ARRAY_SIZE(features),
579 .id_table = id_table,
580 .probe = virtcrypto_probe,
581 .remove = virtcrypto_remove,
582 .config_changed = virtcrypto_config_changed,
583 #ifdef CONFIG_PM_SLEEP
584 .freeze = virtcrypto_freeze,
585 .restore = virtcrypto_restore,
589 module_virtio_driver(virtio_crypto_driver);
591 MODULE_DEVICE_TABLE(virtio, id_table);
592 MODULE_DESCRIPTION("virtio crypto device driver");
593 MODULE_LICENSE("GPL");