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