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