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                 if (unlikely(virtqueue_is_broken(vq)))
  46                         break;
  47         } while (!virtqueue_enable_cb(vq));
  48         spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
  49 }
  50
  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)
  54 {
  55         int err;
  56         unsigned long flags;
  57
  58         init_completion(&vc_ctrl_req->compl);
  59
  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);
  62         if (err < 0) {
  63                 spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
  64                 return err;
  65         }
  66
  67         virtqueue_kick(vcrypto->ctrl_vq);
  68         spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
  69
  70         wait_for_completion(&vc_ctrl_req->compl);
  71
  72         return 0;
  73 }
  74
  75 static void virtcrypto_dataq_callback(struct virtqueue *vq)
  76 {
  77         struct virtio_crypto *vcrypto = vq->vdev->priv;
  78         struct virtio_crypto_request *vc_req;
  79         unsigned long flags;
  80         unsigned int len;
  81         unsigned int qid = vq->index;
  82
  83         spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
  84         do {
  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);
  89                         if (vc_req->alg_cb)
  90                                 vc_req->alg_cb(vc_req, len);
  91                         spin_lock_irqsave(
  92                                 &vcrypto->data_vq[qid].lock, flags);
  93                 }
  94         } while (!virtqueue_enable_cb(vq));
  95         spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
  96 }
  97
  98 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
  99 {
 100         vq_callback_t **callbacks;
 101         struct virtqueue **vqs;
 102         int ret = -ENOMEM;
 103         int i, total_vqs;
 104         const char **names;
 105         struct device *dev = &vi->vdev->dev;
 106
 107         /*
 108          * We expect 1 data virtqueue, followed by
 109          * possible N-1 data queues used in multiqueue mode,
 110          * followed by control vq.
 111          */
 112         total_vqs = vi->max_data_queues + 1;
 113
 114         /* Allocate space for find_vqs parameters */
 115         vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
 116         if (!vqs)
 117                 goto err_vq;
 118         callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
 119         if (!callbacks)
 120                 goto err_callback;
 121         names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
 122         if (!names)
 123                 goto err_names;
 124
 125         /* Parameters for control virtqueue */
 126         callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
 127         names[total_vqs - 1] = "controlq";
 128
 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),
 133                                 "dataq.%d", i);
 134                 names[i] = vi->data_vq[i].name;
 135         }
 136
 137         ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
 138         if (ret)
 139                 goto err_find;
 140
 141         vi->ctrl_vq = vqs[total_vqs - 1];
 142
 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) {
 150                         ret = -ENOMEM;
 151                         goto err_engine;
 152                 }
 153         }
 154
 155         kfree(names);
 156         kfree(callbacks);
 157         kfree(vqs);
 158
 159         return 0;
 160
 161 err_engine:
 162 err_find:
 163         kfree(names);
 164 err_names:
 165         kfree(callbacks);
 166 err_callback:
 167         kfree(vqs);
 168 err_vq:
 169         return ret;
 170 }
 171
 172 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
 173 {
 174         vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
 175                                 GFP_KERNEL);
 176         if (!vi->data_vq)
 177                 return -ENOMEM;
 178
 179         return 0;
 180 }
 181
 182 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
 183 {
 184         int i;
 185
 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);
 189
 190                 vi->affinity_hint_set = false;
 191         }
 192 }
 193
 194 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
 195 {
 196         int i = 0;
 197         int cpu;
 198
 199         /*
 200          * In single queue mode, we don't set the cpu affinity.
 201          */
 202         if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
 203                 virtcrypto_clean_affinity(vcrypto, -1);
 204                 return;
 205         }
 206
 207         /*
 208          * In multiqueue mode, we let the queue to be private to one cpu
 209          * by setting the affinity hint to eliminate the contention.
 210          *
 211          * TODO: adds cpu hotplug support by register cpu notifier.
 212          *
 213          */
 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)
 217                         break;
 218         }
 219
 220         vcrypto->affinity_hint_set = true;
 221 }
 222
 223 static void virtcrypto_free_queues(struct virtio_crypto *vi)
 224 {
 225         kfree(vi->data_vq);
 226 }
 227
 228 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
 229 {
 230         int ret;
 231
 232         /* Allocate send & receive queues */
 233         ret = virtcrypto_alloc_queues(vi);
 234         if (ret)
 235                 goto err;
 236
 237         ret = virtcrypto_find_vqs(vi);
 238         if (ret)
 239                 goto err_free;
 240
 241         cpus_read_lock();
 242         virtcrypto_set_affinity(vi);
 243         cpus_read_unlock();
 244
 245         return 0;
 246
 247 err_free:
 248         virtcrypto_free_queues(vi);
 249 err:
 250         return ret;
 251 }
 252
 253 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
 254 {
 255         u32 status;
 256         int err;
 257
 258         virtio_cread_le(vcrypto->vdev,
 259                         struct virtio_crypto_config, status, &status);
 260
 261         /*
 262          * Unknown status bits would be a host error and the driver
 263          * should consider the device to be broken.
 264          */
 265         if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
 266                 dev_warn(&vcrypto->vdev->dev,
 267                                 "Unknown status bits: 0x%x\n", status);
 268
 269                 virtio_break_device(vcrypto->vdev);
 270                 return -EPERM;
 271         }
 272
 273         if (vcrypto->status == status)
 274                 return 0;
 275
 276         vcrypto->status = status;
 277
 278         if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
 279                 err = virtcrypto_dev_start(vcrypto);
 280                 if (err) {
 281                         dev_err(&vcrypto->vdev->dev,
 282                                 "Failed to start virtio crypto device.\n");
 283
 284                         return -EPERM;
 285                 }
 286                 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
 287         } else {
 288                 virtcrypto_dev_stop(vcrypto);
 289                 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
 290         }
 291
 292         return 0;
 293 }
 294
 295 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
 296 {
 297         int32_t i;
 298         int ret;
 299
 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);
 303                         if (ret)
 304                                 goto err;
 305                 }
 306         }
 307
 308         return 0;
 309
 310 err:
 311         while (--i >= 0)
 312                 if (vcrypto->data_vq[i].engine)
 313                         crypto_engine_exit(vcrypto->data_vq[i].engine);
 314
 315         return ret;
 316 }
 317
 318 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
 319 {
 320         u32 i;
 321
 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);
 325 }
 326
 327 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
 328 {
 329         struct virtio_device *vdev = vcrypto->vdev;
 330
 331         virtcrypto_clean_affinity(vcrypto, -1);
 332
 333         vdev->config->del_vqs(vdev);
 334
 335         virtcrypto_free_queues(vcrypto);
 336 }
 337
 338 static int virtcrypto_probe(struct virtio_device *vdev)
 339 {
 340         int err = -EFAULT;
 341         struct virtio_crypto *vcrypto;
 342         u32 max_data_queues = 0, max_cipher_key_len = 0;
 343         u32 max_auth_key_len = 0;
 344         u64 max_size = 0;
 345         u32 cipher_algo_l = 0;
 346         u32 cipher_algo_h = 0;
 347         u32 hash_algo = 0;
 348         u32 mac_algo_l = 0;
 349         u32 mac_algo_h = 0;
 350         u32 aead_algo = 0;
 351         u32 akcipher_algo = 0;
 352         u32 crypto_services = 0;
 353
 354         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 355                 return -ENODEV;
 356
 357         if (!vdev->config->get) {
 358                 dev_err(&vdev->dev, "%s failure: config access disabled\n",
 359                         __func__);
 360                 return -EINVAL;
 361         }
 362
 363         if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
 364                 /*
 365                  * If the accelerator is connected to a node with no memory
 366                  * there is no point in using the accelerator since the remote
 367                  * memory transaction will be very slow.
 368                  */
 369                 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
 370                 return -EINVAL;
 371         }
 372
 373         vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
 374                                         dev_to_node(&vdev->dev));
 375         if (!vcrypto)
 376                 return -ENOMEM;
 377
 378         virtio_cread_le(vdev, struct virtio_crypto_config,
 379                         max_dataqueues, &max_data_queues);
 380         if (max_data_queues < 1)
 381                 max_data_queues = 1;
 382
 383         virtio_cread_le(vdev, struct virtio_crypto_config,
 384                         max_cipher_key_len, &max_cipher_key_len);
 385         virtio_cread_le(vdev, struct virtio_crypto_config,
 386                         max_auth_key_len, &max_auth_key_len);
 387         virtio_cread_le(vdev, struct virtio_crypto_config,
 388                         max_size, &max_size);
 389         virtio_cread_le(vdev, struct virtio_crypto_config,
 390                         crypto_services, &crypto_services);
 391         virtio_cread_le(vdev, struct virtio_crypto_config,
 392                         cipher_algo_l, &cipher_algo_l);
 393         virtio_cread_le(vdev, struct virtio_crypto_config,
 394                         cipher_algo_h, &cipher_algo_h);
 395         virtio_cread_le(vdev, struct virtio_crypto_config,
 396                         hash_algo, &hash_algo);
 397         virtio_cread_le(vdev, struct virtio_crypto_config,
 398                         mac_algo_l, &mac_algo_l);
 399         virtio_cread_le(vdev, struct virtio_crypto_config,
 400                         mac_algo_h, &mac_algo_h);
 401         virtio_cread_le(vdev, struct virtio_crypto_config,
 402                         aead_algo, &aead_algo);
 403         if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
 404                 virtio_cread_le(vdev, struct virtio_crypto_config,
 405                                 akcipher_algo, &akcipher_algo);
 406
 407         /* Add virtio crypto device to global table */
 408         err = virtcrypto_devmgr_add_dev(vcrypto);
 409         if (err) {
 410                 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
 411                 goto free;
 412         }
 413         vcrypto->owner = THIS_MODULE;
 414         vcrypto = vdev->priv = vcrypto;
 415         vcrypto->vdev = vdev;
 416
 417         spin_lock_init(&vcrypto->ctrl_lock);
 418
 419         /* Use single data queue as default */
 420         vcrypto->curr_queue = 1;
 421         vcrypto->max_data_queues = max_data_queues;
 422         vcrypto->max_cipher_key_len = max_cipher_key_len;
 423         vcrypto->max_auth_key_len = max_auth_key_len;
 424         vcrypto->max_size = max_size;
 425         vcrypto->crypto_services = crypto_services;
 426         vcrypto->cipher_algo_l = cipher_algo_l;
 427         vcrypto->cipher_algo_h = cipher_algo_h;
 428         vcrypto->mac_algo_l = mac_algo_l;
 429         vcrypto->mac_algo_h = mac_algo_h;
 430         vcrypto->hash_algo = hash_algo;
 431         vcrypto->aead_algo = aead_algo;
 432         vcrypto->akcipher_algo = akcipher_algo;
 433
 434         dev_info(&vdev->dev,
 435                 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
 436                 vcrypto->max_data_queues,
 437                 vcrypto->max_cipher_key_len,
 438                 vcrypto->max_auth_key_len,
 439                 vcrypto->max_size);
 440
 441         err = virtcrypto_init_vqs(vcrypto);
 442         if (err) {
 443                 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
 444                 goto free_dev;
 445         }
 446
 447         err = virtcrypto_start_crypto_engines(vcrypto);
 448         if (err)
 449                 goto free_vqs;
 450
 451         virtio_device_ready(vdev);
 452
 453         err = virtcrypto_update_status(vcrypto);
 454         if (err)
 455                 goto free_engines;
 456
 457         return 0;
 458
 459 free_engines:
 460         virtcrypto_clear_crypto_engines(vcrypto);
 461 free_vqs:
 462         virtio_reset_device(vdev);
 463         virtcrypto_del_vqs(vcrypto);
 464 free_dev:
 465         virtcrypto_devmgr_rm_dev(vcrypto);
 466 free:
 467         kfree(vcrypto);
 468         return err;
 469 }
 470
 471 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
 472 {
 473         struct virtio_crypto_request *vc_req;
 474         int i;
 475         struct virtqueue *vq;
 476
 477         for (i = 0; i < vcrypto->max_data_queues; i++) {
 478                 vq = vcrypto->data_vq[i].vq;
 479                 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
 480                         kfree(vc_req->req_data);
 481                         kfree(vc_req->sgs);
 482                 }
 483                 cond_resched();
 484         }
 485 }
 486
 487 static void virtcrypto_remove(struct virtio_device *vdev)
 488 {
 489         struct virtio_crypto *vcrypto = vdev->priv;
 490
 491         dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
 492
 493         if (virtcrypto_dev_started(vcrypto))
 494                 virtcrypto_dev_stop(vcrypto);
 495         virtio_reset_device(vdev);
 496         virtcrypto_free_unused_reqs(vcrypto);
 497         virtcrypto_clear_crypto_engines(vcrypto);
 498         virtcrypto_del_vqs(vcrypto);
 499         virtcrypto_devmgr_rm_dev(vcrypto);
 500         kfree(vcrypto);
 501 }
 502
 503 static void virtcrypto_config_changed(struct virtio_device *vdev)
 504 {
 505         struct virtio_crypto *vcrypto = vdev->priv;
 506
 507         virtcrypto_update_status(vcrypto);
 508 }
 509
 510 #ifdef CONFIG_PM_SLEEP
 511 static int virtcrypto_freeze(struct virtio_device *vdev)
 512 {
 513         struct virtio_crypto *vcrypto = vdev->priv;
 514
 515         virtio_reset_device(vdev);
 516         virtcrypto_free_unused_reqs(vcrypto);
 517         if (virtcrypto_dev_started(vcrypto))
 518                 virtcrypto_dev_stop(vcrypto);
 519
 520         virtcrypto_clear_crypto_engines(vcrypto);
 521         virtcrypto_del_vqs(vcrypto);
 522         return 0;
 523 }
 524
 525 static int virtcrypto_restore(struct virtio_device *vdev)
 526 {
 527         struct virtio_crypto *vcrypto = vdev->priv;
 528         int err;
 529
 530         err = virtcrypto_init_vqs(vcrypto);
 531         if (err)
 532                 return err;
 533
 534         err = virtcrypto_start_crypto_engines(vcrypto);
 535         if (err)
 536                 goto free_vqs;
 537
 538         virtio_device_ready(vdev);
 539
 540         err = virtcrypto_dev_start(vcrypto);
 541         if (err) {
 542                 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
 543                 goto free_engines;
 544         }
 545
 546         return 0;
 547
 548 free_engines:
 549         virtcrypto_clear_crypto_engines(vcrypto);
 550 free_vqs:
 551         virtio_reset_device(vdev);
 552         virtcrypto_del_vqs(vcrypto);
 553         return err;
 554 }
 555 #endif
 556
 557 static const unsigned int features[] = {
 558         /* none */
 559 };
 560
 561 static const struct virtio_device_id id_table[] = {
 562         { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
 563         { 0 },
 564 };
 565
 566 static struct virtio_driver virtio_crypto_driver = {
 567         .driver.name         = KBUILD_MODNAME,
 568         .driver.owner        = THIS_MODULE,
 569         .feature_table       = features,
 570         .feature_table_size  = ARRAY_SIZE(features),
 571         .id_table            = id_table,
 572         .probe               = virtcrypto_probe,
 573         .remove              = virtcrypto_remove,
 574         .config_changed = virtcrypto_config_changed,
 575 #ifdef CONFIG_PM_SLEEP
 576         .freeze = virtcrypto_freeze,
 577         .restore = virtcrypto_restore,
 578 #endif
 579 };
 580
 581 module_virtio_driver(virtio_crypto_driver);
 582
 583 MODULE_DEVICE_TABLE(virtio, id_table);
 584 MODULE_DESCRIPTION("virtio crypto device driver");
 585 MODULE_LICENSE("GPL");
 586 MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");