drivers/crypto/virtio/virtio_crypto_core.c

   1  /* Driver for Virtio crypto device.
   2   *
   3   * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
   4   *
   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.
   9   *
  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.
  14   *
  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/>.
  17   */
  18
  19 #include <linux/err.h>
  20 #include <linux/module.h>
  21 #include <linux/virtio_config.h>
  22 #include <linux/cpu.h>
  23
  24 #include <uapi/linux/virtio_crypto.h>
  25 #include "virtio_crypto_common.h"
  26
  27
  28 void
  29 virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
  30 {
  31         if (vc_req) {
  32                 kzfree(vc_req->iv);
  33                 kzfree(vc_req->req_data);
  34                 kfree(vc_req->sgs);
  35         }
  36 }
  37
  38 static void virtcrypto_dataq_callback(struct virtqueue *vq)
  39 {
  40         struct virtio_crypto *vcrypto = vq->vdev->priv;
  41         struct virtio_crypto_request *vc_req;
  42         unsigned long flags;
  43         unsigned int len;
  44         struct ablkcipher_request *ablk_req;
  45         int error;
  46         unsigned int qid = vq->index;
  47
  48         spin_lock_irqsave(&vcrypto->data_vq[qid].lock, flags);
  49         do {
  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:
  55                                         error = 0;
  56                                         break;
  57                                 case VIRTIO_CRYPTO_INVSESS:
  58                                 case VIRTIO_CRYPTO_ERR:
  59                                         error = -EINVAL;
  60                                         break;
  61                                 case VIRTIO_CRYPTO_BADMSG:
  62                                         error = -EBADMSG;
  63                                         break;
  64                                 default:
  65                                         error = -EIO;
  66                                         break;
  67                                 }
  68                                 ablk_req = vc_req->ablkcipher_req;
  69
  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,
  74                                     ablk_req, error);
  75                                 spin_lock_irqsave(
  76                                         &vcrypto->data_vq[qid].lock, flags);
  77                         }
  78                 }
  79         } while (!virtqueue_enable_cb(vq));
  80         spin_unlock_irqrestore(&vcrypto->data_vq[qid].lock, flags);
  81 }
  82
  83 static int virtcrypto_find_vqs(struct virtio_crypto *vi)
  84 {
  85         vq_callback_t **callbacks;
  86         struct virtqueue **vqs;
  87         int ret = -ENOMEM;
  88         int i, total_vqs;
  89         const char **names;
  90         struct device *dev = &vi->vdev->dev;
  91
  92         /*
  93          * We expect 1 data virtqueue, followed by
  94          * possible N-1 data queues used in multiqueue mode,
  95          * followed by control vq.
  96          */
  97         total_vqs = vi->max_data_queues + 1;
  98
  99         /* Allocate space for find_vqs parameters */
 100         vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
 101         if (!vqs)
 102                 goto err_vq;
 103         callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
 104         if (!callbacks)
 105                 goto err_callback;
 106         names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
 107         if (!names)
 108                 goto err_names;
 109
 110         /* Parameters for control virtqueue */
 111         callbacks[total_vqs - 1] = NULL;
 112         names[total_vqs - 1] = "controlq";
 113
 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),
 118                                 "dataq.%d", i);
 119                 names[i] = vi->data_vq[i].name;
 120         }
 121
 122         ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
 123                                          names, NULL);
 124         if (ret)
 125                 goto err_find;
 126
 127         vi->ctrl_vq = vqs[total_vqs - 1];
 128
 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) {
 135                         ret = -ENOMEM;
 136                         goto err_engine;
 137                 }
 138
 139                 vi->data_vq[i].engine->cipher_one_request =
 140                         virtio_crypto_ablkcipher_crypt_req;
 141         }
 142
 143         kfree(names);
 144         kfree(callbacks);
 145         kfree(vqs);
 146
 147         return 0;
 148
 149 err_engine:
 150 err_find:
 151         kfree(names);
 152 err_names:
 153         kfree(callbacks);
 154 err_callback:
 155         kfree(vqs);
 156 err_vq:
 157         return ret;
 158 }
 159
 160 static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
 161 {
 162         vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
 163                                 GFP_KERNEL);
 164         if (!vi->data_vq)
 165                 return -ENOMEM;
 166
 167         return 0;
 168 }
 169
 170 static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
 171 {
 172         int i;
 173
 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);
 177
 178                 vi->affinity_hint_set = false;
 179         }
 180 }
 181
 182 static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
 183 {
 184         int i = 0;
 185         int cpu;
 186
 187         /*
 188          * In single queue mode, we don't set the cpu affinity.
 189          */
 190         if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
 191                 virtcrypto_clean_affinity(vcrypto, -1);
 192                 return;
 193         }
 194
 195         /*
 196          * In multiqueue mode, we let the queue to be private to one cpu
 197          * by setting the affinity hint to eliminate the contention.
 198          *
 199          * TODO: adds cpu hotplug support by register cpu notifier.
 200          *
 201          */
 202         for_each_online_cpu(cpu) {
 203                 virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
 204                 if (++i >= vcrypto->max_data_queues)
 205                         break;
 206         }
 207
 208         vcrypto->affinity_hint_set = true;
 209 }
 210
 211 static void virtcrypto_free_queues(struct virtio_crypto *vi)
 212 {
 213         kfree(vi->data_vq);
 214 }
 215
 216 static int virtcrypto_init_vqs(struct virtio_crypto *vi)
 217 {
 218         int ret;
 219
 220         /* Allocate send & receive queues */
 221         ret = virtcrypto_alloc_queues(vi);
 222         if (ret)
 223                 goto err;
 224
 225         ret = virtcrypto_find_vqs(vi);
 226         if (ret)
 227                 goto err_free;
 228
 229         get_online_cpus();
 230         virtcrypto_set_affinity(vi);
 231         put_online_cpus();
 232
 233         return 0;
 234
 235 err_free:
 236         virtcrypto_free_queues(vi);
 237 err:
 238         return ret;
 239 }
 240
 241 static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
 242 {
 243         u32 status;
 244         int err;
 245
 246         virtio_cread(vcrypto->vdev,
 247             struct virtio_crypto_config, status, &status);
 248
 249         /*
 250          * Unknown status bits would be a host error and the driver
 251          * should consider the device to be broken.
 252          */
 253         if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
 254                 dev_warn(&vcrypto->vdev->dev,
 255                                 "Unknown status bits: 0x%x\n", status);
 256
 257                 virtio_break_device(vcrypto->vdev);
 258                 return -EPERM;
 259         }
 260
 261         if (vcrypto->status == status)
 262                 return 0;
 263
 264         vcrypto->status = status;
 265
 266         if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
 267                 err = virtcrypto_dev_start(vcrypto);
 268                 if (err) {
 269                         dev_err(&vcrypto->vdev->dev,
 270                                 "Failed to start virtio crypto device.\n");
 271
 272                         return -EPERM;
 273                 }
 274                 dev_info(&vcrypto->vdev->dev, "Accelerator is ready\n");
 275         } else {
 276                 virtcrypto_dev_stop(vcrypto);
 277                 dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
 278         }
 279
 280         return 0;
 281 }
 282
 283 static int virtcrypto_start_crypto_engines(struct virtio_crypto *vcrypto)
 284 {
 285         int32_t i;
 286         int ret;
 287
 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);
 291                         if (ret)
 292                                 goto err;
 293                 }
 294         }
 295
 296         return 0;
 297
 298 err:
 299         while (--i >= 0)
 300                 if (vcrypto->data_vq[i].engine)
 301                         crypto_engine_exit(vcrypto->data_vq[i].engine);
 302
 303         return ret;
 304 }
 305
 306 static void virtcrypto_clear_crypto_engines(struct virtio_crypto *vcrypto)
 307 {
 308         u32 i;
 309
 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);
 313 }
 314
 315 static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
 316 {
 317         struct virtio_device *vdev = vcrypto->vdev;
 318
 319         virtcrypto_clean_affinity(vcrypto, -1);
 320
 321         vdev->config->del_vqs(vdev);
 322
 323         virtcrypto_free_queues(vcrypto);
 324 }
 325
 326 static int virtcrypto_probe(struct virtio_device *vdev)
 327 {
 328         int err = -EFAULT;
 329         struct virtio_crypto *vcrypto;
 330         u32 max_data_queues = 0, max_cipher_key_len = 0;
 331         u32 max_auth_key_len = 0;
 332         u64 max_size = 0;
 333
 334         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
 335                 return -ENODEV;
 336
 337         if (!vdev->config->get) {
 338                 dev_err(&vdev->dev, "%s failure: config access disabled\n",
 339                         __func__);
 340                 return -EINVAL;
 341         }
 342
 343         if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
 344                 /*
 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.
 348                  */
 349                 dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
 350                 return -EINVAL;
 351         }
 352
 353         vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
 354                                         dev_to_node(&vdev->dev));
 355         if (!vcrypto)
 356                 return -ENOMEM;
 357
 358         virtio_cread(vdev, struct virtio_crypto_config,
 359                         max_dataqueues, &max_data_queues);
 360         if (max_data_queues < 1)
 361                 max_data_queues = 1;
 362
 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);
 369
 370         /* Add virtio crypto device to global table */
 371         err = virtcrypto_devmgr_add_dev(vcrypto);
 372         if (err) {
 373                 dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n");
 374                 goto free;
 375         }
 376         vcrypto->owner = THIS_MODULE;
 377         vcrypto = vdev->priv = vcrypto;
 378         vcrypto->vdev = vdev;
 379
 380         spin_lock_init(&vcrypto->ctrl_lock);
 381
 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;
 388
 389         dev_info(&vdev->dev,
 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,
 394                 vcrypto->max_size);
 395
 396         err = virtcrypto_init_vqs(vcrypto);
 397         if (err) {
 398                 dev_err(&vdev->dev, "Failed to initialize vqs.\n");
 399                 goto free_dev;
 400         }
 401
 402         err = virtcrypto_start_crypto_engines(vcrypto);
 403         if (err)
 404                 goto free_vqs;
 405
 406         virtio_device_ready(vdev);
 407
 408         err = virtcrypto_update_status(vcrypto);
 409         if (err)
 410                 goto free_engines;
 411
 412         return 0;
 413
 414 free_engines:
 415         virtcrypto_clear_crypto_engines(vcrypto);
 416 free_vqs:
 417         vcrypto->vdev->config->reset(vdev);
 418         virtcrypto_del_vqs(vcrypto);
 419 free_dev:
 420         virtcrypto_devmgr_rm_dev(vcrypto);
 421 free:
 422         kfree(vcrypto);
 423         return err;
 424 }
 425
 426 static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
 427 {
 428         struct virtio_crypto_request *vc_req;
 429         int i;
 430         struct virtqueue *vq;
 431
 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);
 436                         kfree(vc_req->sgs);
 437                 }
 438         }
 439 }
 440
 441 static void virtcrypto_remove(struct virtio_device *vdev)
 442 {
 443         struct virtio_crypto *vcrypto = vdev->priv;
 444
 445         dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
 446
 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);
 454         kfree(vcrypto);
 455 }
 456
 457 static void virtcrypto_config_changed(struct virtio_device *vdev)
 458 {
 459         struct virtio_crypto *vcrypto = vdev->priv;
 460
 461         virtcrypto_update_status(vcrypto);
 462 }
 463
 464 #ifdef CONFIG_PM_SLEEP
 465 static int virtcrypto_freeze(struct virtio_device *vdev)
 466 {
 467         struct virtio_crypto *vcrypto = vdev->priv;
 468
 469         vdev->config->reset(vdev);
 470         virtcrypto_free_unused_reqs(vcrypto);
 471         if (virtcrypto_dev_started(vcrypto))
 472                 virtcrypto_dev_stop(vcrypto);
 473
 474         virtcrypto_clear_crypto_engines(vcrypto);
 475         virtcrypto_del_vqs(vcrypto);
 476         return 0;
 477 }
 478
 479 static int virtcrypto_restore(struct virtio_device *vdev)
 480 {
 481         struct virtio_crypto *vcrypto = vdev->priv;
 482         int err;
 483
 484         err = virtcrypto_init_vqs(vcrypto);
 485         if (err)
 486                 return err;
 487
 488         err = virtcrypto_start_crypto_engines(vcrypto);
 489         if (err)
 490                 goto free_vqs;
 491
 492         virtio_device_ready(vdev);
 493
 494         err = virtcrypto_dev_start(vcrypto);
 495         if (err) {
 496                 dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
 497                 goto free_engines;
 498         }
 499
 500         return 0;
 501
 502 free_engines:
 503         virtcrypto_clear_crypto_engines(vcrypto);
 504 free_vqs:
 505         vcrypto->vdev->config->reset(vdev);
 506         virtcrypto_del_vqs(vcrypto);
 507         return err;
 508 }
 509 #endif
 510
 511 static unsigned int features[] = {
 512         /* none */
 513 };
 514
 515 static struct virtio_device_id id_table[] = {
 516         { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
 517         { 0 },
 518 };
 519
 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,
 532 #endif
 533 };
 534
 535 module_virtio_driver(virtio_crypto_driver);
 536
 537 MODULE_DEVICE_TABLE(virtio, id_table);
 538 MODULE_DESCRIPTION("virtio crypto device driver");
 539 MODULE_LICENSE("GPL");
 540 MODULE_AUTHOR("Gonglei <arei.gonglei@huawei.com>");