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                 kzfree(vc_req->req_data);
  21                 kfree(vc_req->sgs);
  22         }
  23 }
  24
  25 static void virtcrypto_dataq_callback(struct virtqueue *vq)
  26 {
  27         struct virtio_crypto *vcrypto = vq->vdev->priv;
  28         struct virtio_crypto_request *vc_req;
  29         unsigned long flags;
  30         unsigned int len;
  31         unsigned int qid = vq->index;
  32
  33         spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
  34         do {
  35                 virtqueue_disable_cb(vq);
  36                 while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
  37                         spin_unlock_irqrestore(
  38                                 &vcrypto->data_vq[qid].lock, flags);
  39                         if (vc_req->alg_cb)
  40                                 vc_req->alg_cb(vc_req, len);
  41                         spin_lock_irqsave(
  42                                 &vcrypto->data_vq[qid].lock, flags);
  43                 }
  44         } while (!virtqueue_enable_cb(vq));
  45         spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
  46 }
  47
  48 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
  49 {
  50         vq_callback_t **callbacks;
  51         struct virtqueue **vqs;
  52         int ret = -ENOMEM;
  53         int i, total_vqs;
  54         const char **names;
  55         struct device *dev = &vi->vdev->dev;
  56
  57         /*
  58          * We expect 1 data virtqueue, followed by
  59          * possible N-1 data queues used in multiqueue mode,
  60          * followed by control vq.
  61          */
  62         total_vqs = vi->max_data_queues + 1;
  63
  64         /* Allocate space for find_vqs parameters */
  65         vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
  66         if (!vqs)
  67                 goto err_vq;
  68         callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
  69         if (!callbacks)
  70                 goto err_callback;
  71         names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
  72         if (!names)
  73                 goto err_names;
  74
  75         /* Parameters for control virtqueue */
  76         callbacks[total_vqs - 1] = NULL;
  77         names[total_vqs - 1] = "controlq";
  78
  79         /* Allocate/initialize parameters for data virtqueues */
  80         for (i = 0; i < vi->max_data_queues; i++) {
  81                 callbacks[i] = virtcrypto_dataq_callback;
  82                 snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
  83                                 "dataq.%d", i);
  84                 names[i] = vi->data_vq[i].name;
  85         }
  86
  87         ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
  88         if (ret)
  89                 goto err_find;
  90
  91         vi->ctrl_vq = vqs[total_vqs - 1];
  92
  93         for (i = 0; i < vi->max_data_queues; i++) {
  94                 spin_lock_init(&vi->data_vq[i].lock);
  95                 vi->data_vq[i].vq = vqs[i];
  96                 /* Initialize crypto engine */
  97                 vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
  98                 if (!vi->data_vq[i].engine) {
  99                         ret = -ENOMEM;
 100                         goto err_engine;
 101                 }
 102         }
 103
 104         kfree(names);
 105         kfree(callbacks);
 106         kfree(vqs);
 107
 108         return 0;
 109
 110 err_engine:
 111 err_find:
 112         kfree(names);
 113 err_names:
 114         kfree(callbacks);
 115 err_callback:
 116         kfree(vqs);
 117 err_vq:
 118         return ret;
 119 }
 120
 121 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
 122 {
 123         vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
 124                                 GFP_KERNEL);
 125         if (!vi->data_vq)
 126                 return -ENOMEM;
 127
 128         return 0;
 129 }
 130
 131 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
 132 {
 133         int i;
 134
 135         if (vi->affinity_hint_set) {
 136                 for (i = 0; i < vi->max_data_queues; i++)
 137                         virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
 138
 139                 vi->affinity_hint_set = false;
 140         }
 141 }
 142
 143 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
 144 {
 145         int i = 0;
 146         int cpu;
 147
 148         /*
 149          * In single queue mode, we don't set the cpu affinity.
 150          */
 151         if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
 152                 virtcrypto_clean_affinity(vcrypto, -1);
 153                 return;
 154         }
 155
 156         /*
 157          * In multiqueue mode, we let the queue to be private to one cpu
 158          * by setting the affinity hint to eliminate the contention.
 159          *
 160          * TODO: adds cpu hotplug support by register cpu notifier.
 161          *
 162          */
 163         for_each_online_cpu(cpu) {
 164                 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
 165                 if (++i >= vcrypto->max_data_queues)
 166                         break;
 167         }
 168
 169         vcrypto->affinity_hint_set = true;
 170 }
 171
 172 static void virtcrypto_free_queues(struct virtio_crypto *vi)
 173 {
 174         kfree(vi->data_vq);
 175 }
 176
 177 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
 178 {
 179         int ret;
 180
 181         /* Allocate send & receive queues */
 182         ret = virtcrypto_alloc_queues(vi);
 183         if (ret)
 184                 goto err;
 185
 186         ret = virtcrypto_find_vqs(vi);
 187         if (ret)
 188                 goto err_free;
 189
 190         get_online_cpus();
 191         virtcrypto_set_affinity(vi);
 192         put_online_cpus();
 193
 194         return 0;
 195
 196 err_free:
 197         virtcrypto_free_queues(vi);
 198 err:
 199         return ret;
 200 }
 201
 202 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
 203 {
 204         u32 status;
 205         int err;
 206
 207         virtio_cread(vcrypto->vdev,
 208             struct virtio_crypto_config, status, &status);
 209
 210         /*
 211          * Unknown status bits would be a host error and the driver
 212          * should consider the device to be broken.
 213          */
 214         if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
 215                 dev_warn(&vcrypto->vdev->dev,
 216                                 "Unknown status bits: 0x%x\n", status);
 217
 218                 virtio_break_device(vcrypto->vdev);
 219                 return -EPERM;
 220         }
 221
 222         if (vcrypto->status == status)
 223                 return 0;
 224
 225         vcrypto->status = status;
 226
 227         if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
 228                 err = virtcrypto_dev_start(vcrypto);
 229                 if (err) {
 230                         dev_err(&vcrypto->vdev->dev,
 231                                 "Failed to start virtio crypto device.\n");
 232
 233                         return -EPERM;
 234                 }
 235                 dev_info(&vcrypto->vdev->dev, "Accelerator device is ready\n");
 236         } else {
 237                 virtcrypto_dev_stop(vcrypto);
 238                 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
 239         }
 240
 241         return 0;
 242 }
 243
 244 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
 245 {
 246         int32_t i;
 247         int ret;
 248
 249         for (i = 0; i < vcrypto->max_data_queues; i++) {
 250                 if (vcrypto->data_vq[i].engine) {
 251                         ret = crypto_engine_start(vcrypto->data_vq[i].engine);
 252                         if (ret)
 253                                 goto err;
 254                 }
 255         }
 256
 257         return 0;
 258
 259 err:
 260         while (--i >= 0)
 261                 if (vcrypto->data_vq[i].engine)
 262                         crypto_engine_exit(vcrypto->data_vq[i].engine);
 263
 264         return ret;
 265 }
 266
 267 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
 268 {
 269         u32 i;
 270
 271         for (i = 0; i < vcrypto->max_data_queues; i++)
 272                 if (vcrypto->data_vq[i].engine)
 273                         crypto_engine_exit(vcrypto->data_vq[i].engine);
 274 }
 275
 276 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
 277 {
 278         struct virtio_device *vdev = vcrypto->vdev;
 279
 280         virtcrypto_clean_affinity(vcrypto, -1);
 281
 282         vdev->config->del_vqs(vdev);
 283
 284         virtcrypto_free_queues(vcrypto);
 285 }
 286
 287 static int virtcrypto_probe(struct virtio_device *vdev)
 288 {
 289         int err = -EFAULT;
 290         struct virtio_crypto *vcrypto;
 291         u32 max_data_queues = 0, max_cipher_key_len = 0;
 292         u32 max_auth_key_len = 0;
 293         u64 max_size = 0;
 294         u32 cipher_algo_l = 0;
 295         u32 cipher_algo_h = 0;
 296         u32 hash_algo = 0;
 297         u32 mac_algo_l = 0;
 298         u32 mac_algo_h = 0;
 299         u32 aead_algo = 0;
 300         u32 crypto_services = 0;
 301
 302         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 303                 return -ENODEV;
 304
 305         if (!vdev->config->get) {
 306                 dev_err(&vdev->dev, "%s failure: config access disabled\n",
 307                         __func__);
 308                 return -EINVAL;
 309         }
 310
 311         if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
 312                 /*
 313                  * If the accelerator is connected to a node with no memory
 314                  * there is no point in using the accelerator since the remote
 315                  * memory transaction will be very slow.
 316                  */
 317                 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
 318                 return -EINVAL;
 319         }
 320
 321         vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
 322                                         dev_to_node(&vdev->dev));
 323         if (!vcrypto)
 324                 return -ENOMEM;
 325
 326         virtio_cread(vdev, struct virtio_crypto_config,
 327                         max_dataqueues, &max_data_queues);
 328         if (max_data_queues < 1)
 329                 max_data_queues = 1;
 330
 331         virtio_cread(vdev, struct virtio_crypto_config,
 332                 max_cipher_key_len, &max_cipher_key_len);
 333         virtio_cread(vdev, struct virtio_crypto_config,
 334                 max_auth_key_len, &max_auth_key_len);
 335         virtio_cread(vdev, struct virtio_crypto_config,
 336                 max_size, &max_size);
 337         virtio_cread(vdev, struct virtio_crypto_config,
 338                 crypto_services, &crypto_services);
 339         virtio_cread(vdev, struct virtio_crypto_config,
 340                 cipher_algo_l, &cipher_algo_l);
 341         virtio_cread(vdev, struct virtio_crypto_config,
 342                 cipher_algo_h, &cipher_algo_h);
 343         virtio_cread(vdev, struct virtio_crypto_config,
 344                 hash_algo, &hash_algo);
 345         virtio_cread(vdev, struct virtio_crypto_config,
 346                 mac_algo_l, &mac_algo_l);
 347         virtio_cread(vdev, struct virtio_crypto_config,
 348                 mac_algo_h, &mac_algo_h);
 349         virtio_cread(vdev, struct virtio_crypto_config,
 350                 aead_algo, &aead_algo);
 351
 352         /* Add virtio crypto device to global table */
 353         err = virtcrypto_devmgr_add_dev(vcrypto);
 354         if (err) {
 355                 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
 356                 goto free;
 357         }
 358         vcrypto->owner = THIS_MODULE;
 359         vcrypto = vdev->priv = vcrypto;
 360         vcrypto->vdev = vdev;
 361
 362         spin_lock_init(&vcrypto->ctrl_lock);
 363
 364         /* Use single data queue as default */
 365         vcrypto->curr_queue = 1;
 366         vcrypto->max_data_queues = max_data_queues;
 367         vcrypto->max_cipher_key_len = max_cipher_key_len;
 368         vcrypto->max_auth_key_len = max_auth_key_len;
 369         vcrypto->max_size = max_size;
 370         vcrypto->crypto_services = crypto_services;
 371         vcrypto->cipher_algo_l = cipher_algo_l;
 372         vcrypto->cipher_algo_h = cipher_algo_h;
 373         vcrypto->mac_algo_l = mac_algo_l;
 374         vcrypto->mac_algo_h = mac_algo_h;
 375         vcrypto->hash_algo = hash_algo;
 376         vcrypto->aead_algo = aead_algo;
 377
 378
 379         dev_info(&vdev->dev,
 380                 "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u, max_size 0x%llx\n",
 381                 vcrypto->max_data_queues,
 382                 vcrypto->max_cipher_key_len,
 383                 vcrypto->max_auth_key_len,
 384                 vcrypto->max_size);
 385
 386         err = virtcrypto_init_vqs(vcrypto);
 387         if (err) {
 388                 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
 389                 goto free_dev;
 390         }
 391
 392         err = virtcrypto_start_crypto_engines(vcrypto);
 393         if (err)
 394                 goto free_vqs;
 395
 396         virtio_device_ready(vdev);
 397
 398         err = virtcrypto_update_status(vcrypto);
 399         if (err)
 400                 goto free_engines;
 401
 402         return 0;
 403
 404 free_engines:
 405         virtcrypto_clear_crypto_engines(vcrypto);
 406 free_vqs:
 407         vcrypto->vdev->config->reset(vdev);
 408         virtcrypto_del_vqs(vcrypto);
 409 free_dev:
 410         virtcrypto_devmgr_rm_dev(vcrypto);
 411 free:
 412         kfree(vcrypto);
 413         return err;
 414 }
 415
 416 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
 417 {
 418         struct virtio_crypto_request *vc_req;
 419         int i;
 420         struct virtqueue *vq;
 421
 422         for (i = 0; i < vcrypto->max_data_queues; i++) {
 423                 vq = vcrypto->data_vq[i].vq;
 424                 while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
 425                         kfree(vc_req->req_data);
 426                         kfree(vc_req->sgs);
 427                 }
 428         }
 429 }
 430
 431 static void virtcrypto_remove(struct virtio_device *vdev)
 432 {
 433         struct virtio_crypto *vcrypto = vdev->priv;
 434
 435         dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
 436
 437         if (virtcrypto_dev_started(vcrypto))
 438                 virtcrypto_dev_stop(vcrypto);
 439         vdev->config->reset(vdev);
 440         virtcrypto_free_unused_reqs(vcrypto);
 441         virtcrypto_clear_crypto_engines(vcrypto);
 442         virtcrypto_del_vqs(vcrypto);
 443         virtcrypto_devmgr_rm_dev(vcrypto);
 444         kfree(vcrypto);
 445 }
 446
 447 static void virtcrypto_config_changed(struct virtio_device *vdev)
 448 {
 449         struct virtio_crypto *vcrypto = vdev->priv;
 450
 451         virtcrypto_update_status(vcrypto);
 452 }
 453
 454 #ifdef CONFIG_PM_SLEEP
 455 static int virtcrypto_freeze(struct virtio_device *vdev)
 456 {
 457         struct virtio_crypto *vcrypto = vdev->priv;
 458
 459         vdev->config->reset(vdev);
 460         virtcrypto_free_unused_reqs(vcrypto);
 461         if (virtcrypto_dev_started(vcrypto))
 462                 virtcrypto_dev_stop(vcrypto);
 463
 464         virtcrypto_clear_crypto_engines(vcrypto);
 465         virtcrypto_del_vqs(vcrypto);
 466         return 0;
 467 }
 468
 469 static int virtcrypto_restore(struct virtio_device *vdev)
 470 {
 471         struct virtio_crypto *vcrypto = vdev->priv;
 472         int err;
 473
 474         err = virtcrypto_init_vqs(vcrypto);
 475         if (err)
 476                 return err;
 477
 478         err = virtcrypto_start_crypto_engines(vcrypto);
 479         if (err)
 480                 goto free_vqs;
 481
 482         virtio_device_ready(vdev);
 483
 484         err = virtcrypto_dev_start(vcrypto);
 485         if (err) {
 486                 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
 487                 goto free_engines;
 488         }
 489
 490         return 0;
 491
 492 free_engines:
 493         virtcrypto_clear_crypto_engines(vcrypto);
 494 free_vqs:
 495         vcrypto->vdev->config->reset(vdev);
 496         virtcrypto_del_vqs(vcrypto);
 497         return err;
 498 }
 499 #endif
 500
 501 static unsigned int features[] = {
 502         /* none */
 503 };
 504
 505 static struct virtio_device_id id_table[] = {
 506         { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
 507         { 0 },
 508 };
 509
 510 static struct virtio_driver virtio_crypto_driver = {
 511         .driver.name         = KBUILD_MODNAME,
 512         .driver.owner        = THIS_MODULE,
 513         .feature_table       = features,
 514         .feature_table_size  = ARRAY_SIZE(features),
 515         .id_table            = id_table,
 516         .probe               = virtcrypto_probe,
 517         .remove              = virtcrypto_remove,
 518         .config_changed = virtcrypto_config_changed,
 519 #ifdef CONFIG_PM_SLEEP
 520         .freeze = virtcrypto_freeze,
 521         .restore = virtcrypto_restore,
 522 #endif
 523 };
 524
 525 module_virtio_driver(virtio_crypto_driver);
 526
 527 MODULE_DEVICE_TABLE(virtio, id_table);
 528 MODULE_DESCRIPTION("virtio crypto device driver");
 529 MODULE_LICENSE("GPL");
 530 MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");