drivers/crypto/virtio/virtio_crypto_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2  /* Driver for Virtio crypto device.
   3   *
   4   * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
   5   */
   6
   7 #include <linux/err.h>
   8 #include <linux/module.h>
   9 #include <linux/virtio_config.h>
  10 #include <linux/cpu.h>
  11
  12 #include <uapi/linux/virtio_crypto.h>
  13 #include "virtio_crypto_common.h"
  14
  15
  16 void
  17 virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
  18 {
  19         if (vc_req) {
  20                 kfree_sensitive(vc_req->req_data);
  21                 kfree(vc_req->sgs);
  22         }
  23 }
  24
  25 static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req)
  26 {
  27         complete(&vc_ctrl_req->compl);
  28 }
  29
  30 static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
  31 {
  32         struct virtio_crypto *vcrypto = vq->vdev->priv;
  33         struct virtio_crypto_ctrl_request *vc_ctrl_req;
  34         unsigned long flags;
  35         unsigned int len;
  36
  37         spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
  38         do {
  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);
  44                 }
  45         } while (!virtqueue_enable_cb(vq));
  46         spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
  47 }
  48
  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)
  52 {
  53         int err;
  54         unsigned long flags;
  55
  56         init_completion(&vc_ctrl_req->compl);
  57
  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);
  60         if (err < 0) {
  61                 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
  62                 return err;
  63         }
  64
  65         virtqueue_kick(vcrypto->ctrl_vq);
  66         spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
  67
  68         wait_for_completion(&vc_ctrl_req->compl);
  69
  70         return 0;
  71 }
  72
  73 static void virtcrypto_done_task(unsigned long data)
  74 {
  75         struct data_queue *data_vq = (struct data_queue *)data;
  76         struct virtqueue *vq = data_vq->vq;
  77         struct virtio_crypto_request *vc_req;
  78         unsigned int len;
  79
  80         do {
  81                 virtqueue_disable_cb(vq);
  82                 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
  83                         if (vc_req->alg_cb)
  84                                 vc_req->alg_cb(vc_req, len);
  85                 }
  86         } while (!virtqueue_enable_cb(vq));
  87 }
  88
  89 static void virtcrypto_dataq_callback(struct virtqueue *vq)
  90 {
  91         struct virtio_crypto *vcrypto = vq->vdev->priv;
  92         struct data_queue *dq = &vcrypto->data_vq[vq->index];
  93
  94         tasklet_schedule(&dq->done_task);
  95 }
  96
  97 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
  98 {
  99         struct virtqueue_info *vqs_info;
 100         struct virtqueue **vqs;
 101         int ret = -ENOMEM;
 102         int i, total_vqs;
 103         struct device *dev = &vi->vdev->dev;
 104
 105         /*
 106          * We expect 1 data virtqueue, followed by
 107          * possible N-1 data queues used in multiqueue mode,
 108          * followed by control vq.
 109          */
 110         total_vqs = vi->max_data_queues + 1;
 111
 112         /* Allocate space for find_vqs parameters */
 113         vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
 114         if (!vqs)
 115                 goto err_vq;
 116         vqs_info = kcalloc(total_vqs, sizeof(*vqs_info), GFP_KERNEL);
 117         if (!vqs_info)
 118                 goto err_vqs_info;
 119
 120         /* Parameters for control virtqueue */
 121         vqs_info[total_vqs - 1].callback = virtcrypto_ctrlq_callback;
 122         vqs_info[total_vqs - 1].name = "controlq";
 123
 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),
 128                                 "dataq.%d", i);
 129                 vqs_info[i].name = vi->data_vq[i].name;
 130         }
 131
 132         ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, vqs_info, NULL);
 133         if (ret)
 134                 goto err_find;
 135
 136         vi->ctrl_vq = vqs[total_vqs - 1];
 137
 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) {
 145                         ret = -ENOMEM;
 146                         goto err_engine;
 147                 }
 148                 tasklet_init(&vi->data_vq[i].done_task, virtcrypto_done_task,
 149                                 (unsigned long)&vi->data_vq[i]);
 150         }
 151
 152         kfree(vqs_info);
 153         kfree(vqs);
 154
 155         return 0;
 156
 157 err_engine:
 158 err_find:
 159         kfree(vqs_info);
 160 err_vqs_info:
 161         kfree(vqs);
 162 err_vq:
 163         return ret;
 164 }
 165
 166 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
 167 {
 168         vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
 169                                 GFP_KERNEL);
 170         if (!vi->data_vq)
 171                 return -ENOMEM;
 172
 173         return 0;
 174 }
 175
 176 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
 177 {
 178         int i;
 179
 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);
 183
 184                 vi->affinity_hint_set = false;
 185         }
 186 }
 187
 188 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
 189 {
 190         int i = 0;
 191         int cpu;
 192
 193         /*
 194          * In single queue mode, we don't set the cpu affinity.
 195          */
 196         if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
 197                 virtcrypto_clean_affinity(vcrypto, -1);
 198                 return;
 199         }
 200
 201         /*
 202          * In multiqueue mode, we let the queue to be private to one cpu
 203          * by setting the affinity hint to eliminate the contention.
 204          *
 205          * TODO: adds cpu hotplug support by register cpu notifier.
 206          *
 207          */
 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)
 211                         break;
 212         }
 213
 214         vcrypto->affinity_hint_set = true;
 215 }
 216
 217 static void virtcrypto_free_queues(struct virtio_crypto *vi)
 218 {
 219         kfree(vi->data_vq);
 220 }
 221
 222 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
 223 {
 224         int ret;
 225
 226         /* Allocate send & receive queues */
 227         ret = virtcrypto_alloc_queues(vi);
 228         if (ret)
 229                 goto err;
 230
 231         ret = virtcrypto_find_vqs(vi);
 232         if (ret)
 233                 goto err_free;
 234
 235         cpus_read_lock();
 236         virtcrypto_set_affinity(vi);
 237         cpus_read_unlock();
 238
 239         return 0;
 240
 241 err_free:
 242         virtcrypto_free_queues(vi);
 243 err:
 244         return ret;
 245 }
 246
 247 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
 248 {
 249         u32 status;
 250         int err;
 251
 252         virtio_cread_le(vcrypto->vdev,
 253                         struct virtio_crypto_config, status, &status);
 254
 255         /*
 256          * Unknown status bits would be a host error and the driver
 257          * should consider the device to be broken.
 258          */
 259         if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
 260                 dev_warn(&vcrypto->vdev->dev,
 261                                 "Unknown status bits: 0x%x\n", status);
 262
 263                 virtio_break_device(vcrypto->vdev);
 264                 return -EPERM;
 265         }
 266
 267         if (vcrypto->status == status)
 268                 return 0;
 269
 270         vcrypto->status = status;
 271
 272         if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
 273                 err = virtcrypto_dev_start(vcrypto);
 274                 if (err) {
 275                         dev_err(&vcrypto->vdev->dev,
 276                                 "Failed to start virtio crypto device.\n");
 277
 278                         return -EPERM;
 279                 }
 280                 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
 281         } else {
 282                 virtcrypto_dev_stop(vcrypto);
 283                 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
 284         }
 285
 286         return 0;
 287 }
 288
 289 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
 290 {
 291         int32_t i;
 292         int ret;
 293
 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);
 297                         if (ret)
 298                                 goto err;
 299                 }
 300         }
 301
 302         return 0;
 303
 304 err:
 305         while (--i >= 0)
 306                 if (vcrypto->data_vq[i].engine)
 307                         crypto_engine_exit(vcrypto->data_vq[i].engine);
 308
 309         return ret;
 310 }
 311
 312 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
 313 {
 314         u32 i;
 315
 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);
 319 }
 320
 321 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
 322 {
 323         struct virtio_device *vdev = vcrypto->vdev;
 324
 325         virtcrypto_clean_affinity(vcrypto, -1);
 326
 327         vdev->config->del_vqs(vdev);
 328
 329         virtcrypto_free_queues(vcrypto);
 330 }
 331
 332 static void vcrypto_config_changed_work(struct work_struct *work)
 333 {
 334         struct virtio_crypto *vcrypto =
 335                 container_of(work, struct virtio_crypto, config_work);
 336
 337         virtcrypto_update_status(vcrypto);
 338 }
 339
 340 static int virtcrypto_probe(struct virtio_device *vdev)
 341 {
 342         int err = -EFAULT;
 343         struct virtio_crypto *vcrypto;
 344         u32 max_data_queues = 0, max_cipher_key_len = 0;
 345         u32 max_auth_key_len = 0;
 346         u64 max_size = 0;
 347         u32 cipher_algo_l = 0;
 348         u32 cipher_algo_h = 0;
 349         u32 hash_algo = 0;
 350         u32 mac_algo_l = 0;
 351         u32 mac_algo_h = 0;
 352         u32 aead_algo = 0;
 353         u32 akcipher_algo = 0;
 354         u32 crypto_services = 0;
 355
 356         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 357                 return -ENODEV;
 358
 359         if (!vdev->config->get) {
 360                 dev_err(&vdev->dev, "%s failure: config access disabled\n",
 361                         __func__);
 362                 return -EINVAL;
 363         }
 364
 365         if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
 366                 /*
 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.
 370                  */
 371                 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
 372                 return -EINVAL;
 373         }
 374
 375         vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
 376                                         dev_to_node(&vdev->dev));
 377         if (!vcrypto)
 378                 return -ENOMEM;
 379
 380         virtio_cread_le(vdev, struct virtio_crypto_config,
 381                         max_dataqueues, &max_data_queues);
 382         if (max_data_queues < 1)
 383                 max_data_queues = 1;
 384
 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);
 408
 409         /* Add virtio crypto device to global table */
 410         err = virtcrypto_devmgr_add_dev(vcrypto);
 411         if (err) {
 412                 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
 413                 goto free;
 414         }
 415         vcrypto->owner = THIS_MODULE;
 416         vcrypto = vdev->priv = vcrypto;
 417         vcrypto->vdev = vdev;
 418
 419         spin_lock_init(&vcrypto->ctrl_lock);
 420
 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;
 435
 436         dev_info(&vdev->dev,
 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,
 441                 vcrypto->max_size);
 442
 443         err = virtcrypto_init_vqs(vcrypto);
 444         if (err) {
 445                 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
 446                 goto free_dev;
 447         }
 448
 449         err = virtcrypto_start_crypto_engines(vcrypto);
 450         if (err)
 451                 goto free_vqs;
 452
 453         virtio_device_ready(vdev);
 454
 455         err = virtcrypto_update_status(vcrypto);
 456         if (err)
 457                 goto free_engines;
 458
 459         INIT_WORK(&vcrypto->config_work, vcrypto_config_changed_work);
 460
 461         return 0;
 462
 463 free_engines:
 464         virtcrypto_clear_crypto_engines(vcrypto);
 465 free_vqs:
 466         virtio_reset_device(vdev);
 467         virtcrypto_del_vqs(vcrypto);
 468 free_dev:
 469         virtcrypto_devmgr_rm_dev(vcrypto);
 470 free:
 471         kfree(vcrypto);
 472         return err;
 473 }
 474
 475 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
 476 {
 477         struct virtio_crypto_request *vc_req;
 478         int i;
 479         struct virtqueue *vq;
 480
 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);
 485                         kfree(vc_req->sgs);
 486                 }
 487                 cond_resched();
 488         }
 489 }
 490
 491 static void virtcrypto_remove(struct virtio_device *vdev)
 492 {
 493         struct virtio_crypto *vcrypto = vdev->priv;
 494         int i;
 495
 496         dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
 497
 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);
 508         kfree(vcrypto);
 509 }
 510
 511 static void virtcrypto_config_changed(struct virtio_device *vdev)
 512 {
 513         struct virtio_crypto *vcrypto = vdev->priv;
 514
 515         schedule_work(&vcrypto->config_work);
 516 }
 517
 518 #ifdef CONFIG_PM_SLEEP
 519 static int virtcrypto_freeze(struct virtio_device *vdev)
 520 {
 521         struct virtio_crypto *vcrypto = vdev->priv;
 522
 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);
 528
 529         virtcrypto_clear_crypto_engines(vcrypto);
 530         virtcrypto_del_vqs(vcrypto);
 531         return 0;
 532 }
 533
 534 static int virtcrypto_restore(struct virtio_device *vdev)
 535 {
 536         struct virtio_crypto *vcrypto = vdev->priv;
 537         int err;
 538
 539         err = virtcrypto_init_vqs(vcrypto);
 540         if (err)
 541                 return err;
 542
 543         err = virtcrypto_start_crypto_engines(vcrypto);
 544         if (err)
 545                 goto free_vqs;
 546
 547         virtio_device_ready(vdev);
 548
 549         err = virtcrypto_dev_start(vcrypto);
 550         if (err) {
 551                 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
 552                 goto free_engines;
 553         }
 554
 555         return 0;
 556
 557 free_engines:
 558         virtcrypto_clear_crypto_engines(vcrypto);
 559 free_vqs:
 560         virtio_reset_device(vdev);
 561         virtcrypto_del_vqs(vcrypto);
 562         return err;
 563 }
 564 #endif
 565
 566 static const unsigned int features[] = {
 567         /* none */
 568 };
 569
 570 static const struct virtio_device_id id_table[] = {
 571         { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
 572         { 0 },
 573 };
 574
 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,
 586 #endif
 587 };
 588
 589 module_virtio_driver(virtio_crypto_driver);
 590
 591 MODULE_DEVICE_TABLE(virtio, id_table);
 592 MODULE_DESCRIPTION("virtio crypto device driver");
 593 MODULE_LICENSE("GPL");
 594 MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");