1 /* Driver for Virtio crypto device.
3 * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include <linux/err.h>
20 #include <linux/module.h>
21 #include <linux/virtio_config.h>
22 #include <linux/cpu.h>
24 #include <uapi/linux/virtio_crypto.h>
25 #include "virtio_crypto_common.h"
29 virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
33 kzfree(vc_req->req_data);
38 static void virtcrypto_dataq_callback(struct virtqueue *vq)
40 struct virtio_crypto *vcrypto = vq->vdev->priv;
41 struct virtio_crypto_request *vc_req;
44 struct ablkcipher_request *ablk_req;
46 unsigned int qid = vq->index;
48 spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
50 virtqueue_disable_cb(vq);
51 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
52 if (vc_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
53 switch (vc_req->status) {
54 case VIRTIO_CRYPTO_OK:
57 case VIRTIO_CRYPTO_INVSESS:
58 case VIRTIO_CRYPTO_ERR:
61 case VIRTIO_CRYPTO_BADMSG:
68 ablk_req = vc_req->ablkcipher_req;
70 spin_unlock_irqrestore(
71 &vcrypto->data_vq[qid].lock, flags);
72 /* Finish the encrypt or decrypt process */
73 virtio_crypto_ablkcipher_finalize_req(vc_req,
76 &vcrypto->data_vq[qid].lock, flags);
79 } while (!virtqueue_enable_cb(vq));
80 spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
83 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
85 vq_callback_t **callbacks;
86 struct virtqueue **vqs;
90 struct device *dev = &vi->vdev->dev;
93 * We expect 1 data virtqueue, followed by
94 * possible N-1 data queues used in multiqueue mode,
95 * followed by control vq.
97 total_vqs = vi->max_data_queues + 1;
99 /* Allocate space for find_vqs parameters */
100 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
103 callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
106 names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
110 /* Parameters for control virtqueue */
111 callbacks[total_vqs - 1] = NULL;
112 names[total_vqs - 1] = "controlq";
114 /* Allocate/initialize parameters for data virtqueues */
115 for (i = 0; i < vi->max_data_queues; i++) {
116 callbacks[i] = virtcrypto_dataq_callback;
117 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
119 names[i] = vi->data_vq[i].name;
122 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
127 vi->ctrl_vq = vqs[total_vqs - 1];
129 for (i = 0; i < vi->max_data_queues; i++) {
130 spin_lock_init(&vi->data_vq[i].lock);
131 vi->data_vq[i].vq = vqs[i];
132 /* Initialize crypto engine */
133 vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
134 if (!vi->data_vq[i].engine) {
139 vi->data_vq[i].engine->cipher_one_request =
140 virtio_crypto_ablkcipher_crypt_req;
160 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
162 vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
170 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
174 if (vi->affinity_hint_set) {
175 for (i = 0; i < vi->max_data_queues; i++)
176 virtqueue_set_affinity(vi->data_vq[i].vq, -1);
178 vi->affinity_hint_set = false;
182 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
188 * In single queue mode, we don't set the cpu affinity.
190 if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
191 virtcrypto_clean_affinity(vcrypto, -1);
196 * In multiqueue mode, we let the queue to be private to one cpu
197 * by setting the affinity hint to eliminate the contention.
199 * TODO: adds cpu hotplug support by register cpu notifier.
202 for_each_online_cpu(cpu) {
203 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
204 if (++i >= vcrypto->max_data_queues)
208 vcrypto->affinity_hint_set = true;
211 static void virtcrypto_free_queues(struct virtio_crypto *vi)
216 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
220 /* Allocate send & receive queues */
221 ret = virtcrypto_alloc_queues(vi);
225 ret = virtcrypto_find_vqs(vi);
230 virtcrypto_set_affinity(vi);
236 virtcrypto_free_queues(vi);
241 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
246 virtio_cread(vcrypto->vdev,
247 struct virtio_crypto_config, status, &status);
250 * Unknown status bits would be a host error and the driver
251 * should consider the device to be broken.
253 if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
254 dev_warn(&vcrypto->vdev->dev,
255 "Unknown status bits: 0x%x\n", status);
257 virtio_break_device(vcrypto->vdev);
261 if (vcrypto->status == status)
264 vcrypto->status = status;
266 if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
267 err = virtcrypto_dev_start(vcrypto);
269 dev_err(&vcrypto->vdev->dev,
270 "Failed to start virtio crypto device.\n");
274 dev_info(&vcrypto->vdev->dev, "Accelerator is ready\n");
276 virtcrypto_dev_stop(vcrypto);
277 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
283 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
288 for (i = 0; i < vcrypto->max_data_queues; i++) {
289 if (vcrypto->data_vq[i].engine) {
290 ret = crypto_engine_start(vcrypto->data_vq[i].engine);
300 if (vcrypto->data_vq[i].engine)
301 crypto_engine_exit(vcrypto->data_vq[i].engine);
306 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
310 for (i = 0; i < vcrypto->max_data_queues; i++)
311 if (vcrypto->data_vq[i].engine)
312 crypto_engine_exit(vcrypto->data_vq[i].engine);
315 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
317 struct virtio_device *vdev = vcrypto->vdev;
319 virtcrypto_clean_affinity(vcrypto, -1);
321 vdev->config->del_vqs(vdev);
323 virtcrypto_free_queues(vcrypto);
326 static int virtcrypto_probe(struct virtio_device *vdev)
329 struct virtio_crypto *vcrypto;
330 u32 max_data_queues = 0, max_cipher_key_len = 0;
331 u32 max_auth_key_len = 0;
334 if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
337 if (!vdev->config->get) {
338 dev_err(&vdev->dev, "%s failure: config access disabled\n",
343 if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
345 * If the accelerator is connected to a node with no memory
346 * there is no point in using the accelerator since the remote
347 * memory transaction will be very slow.
349 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
353 vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
354 dev_to_node(&vdev->dev));
358 virtio_cread(vdev, struct virtio_crypto_config,
359 max_dataqueues, &max_data_queues);
360 if (max_data_queues < 1)
363 virtio_cread(vdev, struct virtio_crypto_config,
364 max_cipher_key_len, &max_cipher_key_len);
365 virtio_cread(vdev, struct virtio_crypto_config,
366 max_auth_key_len, &max_auth_key_len);
367 virtio_cread(vdev, struct virtio_crypto_config,
368 max_size, &max_size);
370 /* Add virtio crypto device to global table */
371 err = virtcrypto_devmgr_add_dev(vcrypto);
373 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
376 vcrypto->owner = THIS_MODULE;
377 vcrypto = vdev->priv = vcrypto;
378 vcrypto->vdev = vdev;
380 spin_lock_init(&vcrypto->ctrl_lock);
382 /* Use single data queue as default */
383 vcrypto->curr_queue = 1;
384 vcrypto->max_data_queues = max_data_queues;
385 vcrypto->max_cipher_key_len = max_cipher_key_len;
386 vcrypto->max_auth_key_len = max_auth_key_len;
387 vcrypto->max_size = max_size;
390 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
391 vcrypto->max_data_queues,
392 vcrypto->max_cipher_key_len,
393 vcrypto->max_auth_key_len,
396 err = virtcrypto_init_vqs(vcrypto);
398 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
402 err = virtcrypto_start_crypto_engines(vcrypto);
406 virtio_device_ready(vdev);
408 err = virtcrypto_update_status(vcrypto);
415 virtcrypto_clear_crypto_engines(vcrypto);
417 vcrypto->vdev->config->reset(vdev);
418 virtcrypto_del_vqs(vcrypto);
420 virtcrypto_devmgr_rm_dev(vcrypto);
426 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
428 struct virtio_crypto_request *vc_req;
430 struct virtqueue *vq;
432 for (i = 0; i < vcrypto->max_data_queues; i++) {
433 vq = vcrypto->data_vq[i].vq;
434 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
435 kfree(vc_req->req_data);
441 static void virtcrypto_remove(struct virtio_device *vdev)
443 struct virtio_crypto *vcrypto = vdev->priv;
445 dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
447 if (virtcrypto_dev_started(vcrypto))
448 virtcrypto_dev_stop(vcrypto);
449 vdev->config->reset(vdev);
450 virtcrypto_free_unused_reqs(vcrypto);
451 virtcrypto_clear_crypto_engines(vcrypto);
452 virtcrypto_del_vqs(vcrypto);
453 virtcrypto_devmgr_rm_dev(vcrypto);
457 static void virtcrypto_config_changed(struct virtio_device *vdev)
459 struct virtio_crypto *vcrypto = vdev->priv;
461 virtcrypto_update_status(vcrypto);
464 #ifdef CONFIG_PM_SLEEP
465 static int virtcrypto_freeze(struct virtio_device *vdev)
467 struct virtio_crypto *vcrypto = vdev->priv;
469 vdev->config->reset(vdev);
470 virtcrypto_free_unused_reqs(vcrypto);
471 if (virtcrypto_dev_started(vcrypto))
472 virtcrypto_dev_stop(vcrypto);
474 virtcrypto_clear_crypto_engines(vcrypto);
475 virtcrypto_del_vqs(vcrypto);
479 static int virtcrypto_restore(struct virtio_device *vdev)
481 struct virtio_crypto *vcrypto = vdev->priv;
484 err = virtcrypto_init_vqs(vcrypto);
488 err = virtcrypto_start_crypto_engines(vcrypto);
492 virtio_device_ready(vdev);
494 err = virtcrypto_dev_start(vcrypto);
496 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
503 virtcrypto_clear_crypto_engines(vcrypto);
505 vcrypto->vdev->config->reset(vdev);
506 virtcrypto_del_vqs(vcrypto);
511 static unsigned int features[] = {
515 static struct virtio_device_id id_table[] = {
516 { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
520 static struct virtio_driver virtio_crypto_driver = {
521 .driver.name = KBUILD_MODNAME,
522 .driver.owner = THIS_MODULE,
523 .feature_table = features,
524 .feature_table_size = ARRAY_SIZE(features),
525 .id_table = id_table,
526 .probe = virtcrypto_probe,
527 .remove = virtcrypto_remove,
528 .config_changed = virtcrypto_config_changed,
529 #ifdef CONFIG_PM_SLEEP
530 .freeze = virtcrypto_freeze,
531 .restore = virtcrypto_restore,
535 module_virtio_driver(virtio_crypto_driver);
537 MODULE_DEVICE_TABLE(virtio, id_table);
538 MODULE_DESCRIPTION("virtio crypto device driver");
539 MODULE_LICENSE("GPL");