drivers/vdpa/vdpa_sim/vdpa_sim.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VDPA device simulator core.
   4  *
   5  * Copyright (c) 2020, Red Hat Inc. All rights reserved.
   6  *     Author: Jason Wang <jasowang@redhat.com>
   7  *
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/device.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kthread.h>
  15 #include <linux/slab.h>
  16 #include <linux/dma-map-ops.h>
  17 #include <linux/vringh.h>
  18 #include <linux/vdpa.h>
  19 #include <linux/vhost_iotlb.h>
  20 #include <uapi/linux/vdpa.h>
  21 #include <uapi/linux/vhost_types.h>
  22
  23 #include "vdpa_sim.h"
  24
  25 #define DRV_VERSION  "0.1"
  26 #define DRV_AUTHOR   "Jason Wang <jasowang@redhat.com>"
  27 #define DRV_DESC     "vDPA Device Simulator core"
  28 #define DRV_LICENSE  "GPL v2"
  29
  30 static int batch_mapping = 1;
  31 module_param(batch_mapping, int, 0444);
  32 MODULE_PARM_DESC(batch_mapping, "Batched mapping 1 -Enable; 0 - Disable");
  33
  34 static int max_iotlb_entries = 2048;
  35 module_param(max_iotlb_entries, int, 0444);
  36 MODULE_PARM_DESC(max_iotlb_entries,
  37                  "Maximum number of iotlb entries for each address space. 0 means unlimited. (default: 2048)");
  38
  39 static bool use_va = true;
  40 module_param(use_va, bool, 0444);
  41 MODULE_PARM_DESC(use_va, "Enable/disable the device's ability to use VA");
  42
  43 #define VDPASIM_QUEUE_ALIGN PAGE_SIZE
  44 #define VDPASIM_QUEUE_MAX 256
  45 #define VDPASIM_VENDOR_ID 0
  46
  47 struct vdpasim_mm_work {
  48         struct kthread_work work;
  49         struct vdpasim *vdpasim;
  50         struct mm_struct *mm_to_bind;
  51         int ret;
  52 };
  53
  54 static void vdpasim_mm_work_fn(struct kthread_work *work)
  55 {
  56         struct vdpasim_mm_work *mm_work =
  57                 container_of(work, struct vdpasim_mm_work, work);
  58         struct vdpasim *vdpasim = mm_work->vdpasim;
  59
  60         mm_work->ret = 0;
  61
  62         //TODO: should we attach the cgroup of the mm owner?
  63         vdpasim->mm_bound = mm_work->mm_to_bind;
  64 }
  65
  66 static void vdpasim_worker_change_mm_sync(struct vdpasim *vdpasim,
  67                                           struct vdpasim_mm_work *mm_work)
  68 {
  69         struct kthread_work *work = &mm_work->work;
  70
  71         kthread_init_work(work, vdpasim_mm_work_fn);
  72         kthread_queue_work(vdpasim->worker, work);
  73
  74         kthread_flush_work(work);
  75 }
  76
  77 static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa)
  78 {
  79         return container_of(vdpa, struct vdpasim, vdpa);
  80 }
  81
  82 static void vdpasim_vq_notify(struct vringh *vring)
  83 {
  84         struct vdpasim_virtqueue *vq =
  85                 container_of(vring, struct vdpasim_virtqueue, vring);
  86
  87         if (!vq->cb)
  88                 return;
  89
  90         vq->cb(vq->private);
  91 }
  92
  93 static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
  94 {
  95         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
  96         uint16_t last_avail_idx = vq->vring.last_avail_idx;
  97         struct vring_desc *desc = (struct vring_desc *)
  98                                   (uintptr_t)vq->desc_addr;
  99         struct vring_avail *avail = (struct vring_avail *)
 100                                     (uintptr_t)vq->driver_addr;
 101         struct vring_used *used = (struct vring_used *)
 102                                   (uintptr_t)vq->device_addr;
 103
 104         if (use_va && vdpasim->mm_bound) {
 105                 vringh_init_iotlb_va(&vq->vring, vdpasim->features, vq->num,
 106                                      true, desc, avail, used);
 107         } else {
 108                 vringh_init_iotlb(&vq->vring, vdpasim->features, vq->num,
 109                                   true, desc, avail, used);
 110         }
 111
 112         vq->vring.last_avail_idx = last_avail_idx;
 113
 114         /*
 115          * Since vdpa_sim does not support receive inflight descriptors as a
 116          * destination of a migration, let's set both avail_idx and used_idx
 117          * the same at vq start.  This is how vhost-user works in a
 118          * VHOST_SET_VRING_BASE call.
 119          *
 120          * Although the simple fix is to set last_used_idx at
 121          * vdpasim_set_vq_state, it would be reset at vdpasim_queue_ready.
 122          */
 123         vq->vring.last_used_idx = last_avail_idx;
 124         vq->vring.notify = vdpasim_vq_notify;
 125 }
 126
 127 static void vdpasim_vq_reset(struct vdpasim *vdpasim,
 128                              struct vdpasim_virtqueue *vq)
 129 {
 130         vq->ready = false;
 131         vq->desc_addr = 0;
 132         vq->driver_addr = 0;
 133         vq->device_addr = 0;
 134         vq->cb = NULL;
 135         vq->private = NULL;
 136         vringh_init_iotlb(&vq->vring, vdpasim->dev_attr.supported_features,
 137                           VDPASIM_QUEUE_MAX, false, NULL, NULL, NULL);
 138
 139         vq->vring.notify = NULL;
 140 }
 141
 142 static void vdpasim_do_reset(struct vdpasim *vdpasim, u32 flags)
 143 {
 144         int i;
 145
 146         spin_lock(&vdpasim->iommu_lock);
 147
 148         for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
 149                 vdpasim_vq_reset(vdpasim, &vdpasim->vqs[i]);
 150                 vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
 151                                  &vdpasim->iommu_lock);
 152         }
 153
 154         if (flags & VDPA_RESET_F_CLEAN_MAP) {
 155                 for (i = 0; i < vdpasim->dev_attr.nas; i++) {
 156                         vhost_iotlb_reset(&vdpasim->iommu[i]);
 157                         vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX,
 158                                               0, VHOST_MAP_RW);
 159                         vdpasim->iommu_pt[i] = true;
 160                 }
 161         }
 162
 163         vdpasim->running = true;
 164         spin_unlock(&vdpasim->iommu_lock);
 165
 166         vdpasim->features = 0;
 167         vdpasim->status = 0;
 168         ++vdpasim->generation;
 169 }
 170
 171 static const struct vdpa_config_ops vdpasim_config_ops;
 172 static const struct vdpa_config_ops vdpasim_batch_config_ops;
 173
 174 static void vdpasim_work_fn(struct kthread_work *work)
 175 {
 176         struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
 177         struct mm_struct *mm = vdpasim->mm_bound;
 178
 179         if (use_va && mm) {
 180                 if (!mmget_not_zero(mm))
 181                         return;
 182                 kthread_use_mm(mm);
 183         }
 184
 185         vdpasim->dev_attr.work_fn(vdpasim);
 186
 187         if (use_va && mm) {
 188                 kthread_unuse_mm(mm);
 189                 mmput(mm);
 190         }
 191 }
 192
 193 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
 194                                const struct vdpa_dev_set_config *config)
 195 {
 196         const struct vdpa_config_ops *ops;
 197         struct vdpa_device *vdpa;
 198         struct vdpasim *vdpasim;
 199         struct device *dev;
 200         int i, ret = -ENOMEM;
 201
 202         if (!dev_attr->alloc_size)
 203                 return ERR_PTR(-EINVAL);
 204
 205         if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
 206                 if (config->device_features &
 207                     ~dev_attr->supported_features)
 208                         return ERR_PTR(-EINVAL);
 209                 dev_attr->supported_features =
 210                         config->device_features;
 211         }
 212
 213         if (batch_mapping)
 214                 ops = &vdpasim_batch_config_ops;
 215         else
 216                 ops = &vdpasim_config_ops;
 217
 218         vdpa = __vdpa_alloc_device(NULL, ops,
 219                                    dev_attr->ngroups, dev_attr->nas,
 220                                    dev_attr->alloc_size,
 221                                    dev_attr->name, use_va);
 222         if (IS_ERR(vdpa)) {
 223                 ret = PTR_ERR(vdpa);
 224                 goto err_alloc;
 225         }
 226
 227         vdpasim = vdpa_to_sim(vdpa);
 228         vdpasim->dev_attr = *dev_attr;
 229         dev = &vdpasim->vdpa.dev;
 230
 231         kthread_init_work(&vdpasim->work, vdpasim_work_fn);
 232         vdpasim->worker = kthread_create_worker(0, "vDPA sim worker: %s",
 233                                                 dev_attr->name);
 234         if (IS_ERR(vdpasim->worker))
 235                 goto err_iommu;
 236
 237         mutex_init(&vdpasim->mutex);
 238         spin_lock_init(&vdpasim->iommu_lock);
 239
 240         dev->dma_mask = &dev->coherent_dma_mask;
 241         if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)))
 242                 goto err_iommu;
 243         vdpasim->vdpa.mdev = dev_attr->mgmt_dev;
 244
 245         vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL);
 246         if (!vdpasim->config)
 247                 goto err_iommu;
 248
 249         vdpasim->vqs = kcalloc(dev_attr->nvqs, sizeof(struct vdpasim_virtqueue),
 250                                GFP_KERNEL);
 251         if (!vdpasim->vqs)
 252                 goto err_iommu;
 253
 254         vdpasim->iommu = kmalloc_array(vdpasim->dev_attr.nas,
 255                                        sizeof(*vdpasim->iommu), GFP_KERNEL);
 256         if (!vdpasim->iommu)
 257                 goto err_iommu;
 258
 259         vdpasim->iommu_pt = kmalloc_array(vdpasim->dev_attr.nas,
 260                                           sizeof(*vdpasim->iommu_pt), GFP_KERNEL);
 261         if (!vdpasim->iommu_pt)
 262                 goto err_iommu;
 263
 264         for (i = 0; i < vdpasim->dev_attr.nas; i++) {
 265                 vhost_iotlb_init(&vdpasim->iommu[i], max_iotlb_entries, 0);
 266                 vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX, 0,
 267                                       VHOST_MAP_RW);
 268                 vdpasim->iommu_pt[i] = true;
 269         }
 270
 271         for (i = 0; i < dev_attr->nvqs; i++)
 272                 vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
 273                                  &vdpasim->iommu_lock);
 274
 275         vdpasim->vdpa.dma_dev = dev;
 276
 277         return vdpasim;
 278
 279 err_iommu:
 280         put_device(dev);
 281 err_alloc:
 282         return ERR_PTR(ret);
 283 }
 284 EXPORT_SYMBOL_GPL(vdpasim_create);
 285
 286 void vdpasim_schedule_work(struct vdpasim *vdpasim)
 287 {
 288         kthread_queue_work(vdpasim->worker, &vdpasim->work);
 289 }
 290 EXPORT_SYMBOL_GPL(vdpasim_schedule_work);
 291
 292 static int vdpasim_set_vq_address(struct vdpa_device *vdpa, u16 idx,
 293                                   u64 desc_area, u64 driver_area,
 294                                   u64 device_area)
 295 {
 296         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 297         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 298
 299         vq->desc_addr = desc_area;
 300         vq->driver_addr = driver_area;
 301         vq->device_addr = device_area;
 302
 303         return 0;
 304 }
 305
 306 static void vdpasim_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num)
 307 {
 308         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 309         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 310
 311         vq->num = num;
 312 }
 313
 314 static void vdpasim_kick_vq(struct vdpa_device *vdpa, u16 idx)
 315 {
 316         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 317         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 318
 319         if (!vdpasim->running &&
 320             (vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 321                 vdpasim->pending_kick = true;
 322                 return;
 323         }
 324
 325         if (vq->ready)
 326                 vdpasim_schedule_work(vdpasim);
 327 }
 328
 329 static void vdpasim_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
 330                               struct vdpa_callback *cb)
 331 {
 332         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 333         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 334
 335         vq->cb = cb->callback;
 336         vq->private = cb->private;
 337 }
 338
 339 static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
 340 {
 341         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 342         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 343         bool old_ready;
 344
 345         mutex_lock(&vdpasim->mutex);
 346         old_ready = vq->ready;
 347         vq->ready = ready;
 348         if (vq->ready && !old_ready) {
 349                 vdpasim_queue_ready(vdpasim, idx);
 350         }
 351         mutex_unlock(&vdpasim->mutex);
 352 }
 353
 354 static bool vdpasim_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
 355 {
 356         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 357         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 358
 359         return vq->ready;
 360 }
 361
 362 static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
 363                                 const struct vdpa_vq_state *state)
 364 {
 365         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 366         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 367         struct vringh *vrh = &vq->vring;
 368
 369         mutex_lock(&vdpasim->mutex);
 370         vrh->last_avail_idx = state->split.avail_index;
 371         mutex_unlock(&vdpasim->mutex);
 372
 373         return 0;
 374 }
 375
 376 static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
 377                                 struct vdpa_vq_state *state)
 378 {
 379         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 380         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 381         struct vringh *vrh = &vq->vring;
 382
 383         state->split.avail_index = vrh->last_avail_idx;
 384         return 0;
 385 }
 386
 387 static int vdpasim_get_vq_stats(struct vdpa_device *vdpa, u16 idx,
 388                                 struct sk_buff *msg,
 389                                 struct netlink_ext_ack *extack)
 390 {
 391         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 392
 393         if (vdpasim->dev_attr.get_stats)
 394                 return vdpasim->dev_attr.get_stats(vdpasim, idx,
 395                                                    msg, extack);
 396         return -EOPNOTSUPP;
 397 }
 398
 399 static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
 400 {
 401         return VDPASIM_QUEUE_ALIGN;
 402 }
 403
 404 static u32 vdpasim_get_vq_group(struct vdpa_device *vdpa, u16 idx)
 405 {
 406         /* RX and TX belongs to group 0, CVQ belongs to group 1 */
 407         if (idx == 2)
 408                 return 1;
 409         else
 410                 return 0;
 411 }
 412
 413 static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
 414 {
 415         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 416
 417         return vdpasim->dev_attr.supported_features;
 418 }
 419
 420 static u64 vdpasim_get_backend_features(const struct vdpa_device *vdpa)
 421 {
 422         return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK);
 423 }
 424
 425 static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)
 426 {
 427         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 428
 429         /* DMA mapping must be done by driver */
 430         if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
 431                 return -EINVAL;
 432
 433         vdpasim->features = features & vdpasim->dev_attr.supported_features;
 434
 435         return 0;
 436 }
 437
 438 static u64 vdpasim_get_driver_features(struct vdpa_device *vdpa)
 439 {
 440         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 441
 442         return vdpasim->features;
 443 }
 444
 445 static void vdpasim_set_config_cb(struct vdpa_device *vdpa,
 446                                   struct vdpa_callback *cb)
 447 {
 448         /* We don't support config interrupt */
 449 }
 450
 451 static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa)
 452 {
 453         return VDPASIM_QUEUE_MAX;
 454 }
 455
 456 static u32 vdpasim_get_device_id(struct vdpa_device *vdpa)
 457 {
 458         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 459
 460         return vdpasim->dev_attr.id;
 461 }
 462
 463 static u32 vdpasim_get_vendor_id(struct vdpa_device *vdpa)
 464 {
 465         return VDPASIM_VENDOR_ID;
 466 }
 467
 468 static u8 vdpasim_get_status(struct vdpa_device *vdpa)
 469 {
 470         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 471         u8 status;
 472
 473         mutex_lock(&vdpasim->mutex);
 474         status = vdpasim->status;
 475         mutex_unlock(&vdpasim->mutex);
 476
 477         return status;
 478 }
 479
 480 static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
 481 {
 482         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 483
 484         mutex_lock(&vdpasim->mutex);
 485         vdpasim->status = status;
 486         mutex_unlock(&vdpasim->mutex);
 487 }
 488
 489 static int vdpasim_compat_reset(struct vdpa_device *vdpa, u32 flags)
 490 {
 491         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 492
 493         mutex_lock(&vdpasim->mutex);
 494         vdpasim->status = 0;
 495         vdpasim_do_reset(vdpasim, flags);
 496         mutex_unlock(&vdpasim->mutex);
 497
 498         return 0;
 499 }
 500
 501 static int vdpasim_reset(struct vdpa_device *vdpa)
 502 {
 503         return vdpasim_compat_reset(vdpa, 0);
 504 }
 505
 506 static int vdpasim_suspend(struct vdpa_device *vdpa)
 507 {
 508         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 509
 510         mutex_lock(&vdpasim->mutex);
 511         vdpasim->running = false;
 512         mutex_unlock(&vdpasim->mutex);
 513
 514         return 0;
 515 }
 516
 517 static int vdpasim_resume(struct vdpa_device *vdpa)
 518 {
 519         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 520         int i;
 521
 522         mutex_lock(&vdpasim->mutex);
 523         vdpasim->running = true;
 524
 525         if (vdpasim->pending_kick) {
 526                 /* Process pending descriptors */
 527                 for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
 528                         vdpasim_kick_vq(vdpa, i);
 529
 530                 vdpasim->pending_kick = false;
 531         }
 532
 533         mutex_unlock(&vdpasim->mutex);
 534
 535         return 0;
 536 }
 537
 538 static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
 539 {
 540         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 541
 542         return vdpasim->dev_attr.config_size;
 543 }
 544
 545 static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
 546                              void *buf, unsigned int len)
 547 {
 548         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 549
 550         if (offset + len > vdpasim->dev_attr.config_size)
 551                 return;
 552
 553         if (vdpasim->dev_attr.get_config)
 554                 vdpasim->dev_attr.get_config(vdpasim, vdpasim->config);
 555
 556         memcpy(buf, vdpasim->config + offset, len);
 557 }
 558
 559 static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
 560                              const void *buf, unsigned int len)
 561 {
 562         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 563
 564         if (offset + len > vdpasim->dev_attr.config_size)
 565                 return;
 566
 567         memcpy(vdpasim->config + offset, buf, len);
 568
 569         if (vdpasim->dev_attr.set_config)
 570                 vdpasim->dev_attr.set_config(vdpasim, vdpasim->config);
 571 }
 572
 573 static u32 vdpasim_get_generation(struct vdpa_device *vdpa)
 574 {
 575         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 576
 577         return vdpasim->generation;
 578 }
 579
 580 static struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa)
 581 {
 582         struct vdpa_iova_range range = {
 583                 .first = 0ULL,
 584                 .last = ULLONG_MAX,
 585         };
 586
 587         return range;
 588 }
 589
 590 static int vdpasim_set_group_asid(struct vdpa_device *vdpa, unsigned int group,
 591                                   unsigned int asid)
 592 {
 593         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 594         struct vhost_iotlb *iommu;
 595         int i;
 596
 597         if (group > vdpasim->dev_attr.ngroups)
 598                 return -EINVAL;
 599
 600         if (asid >= vdpasim->dev_attr.nas)
 601                 return -EINVAL;
 602
 603         iommu = &vdpasim->iommu[asid];
 604
 605         mutex_lock(&vdpasim->mutex);
 606
 607         for (i = 0; i < vdpasim->dev_attr.nvqs; i++)
 608                 if (vdpasim_get_vq_group(vdpa, i) == group)
 609                         vringh_set_iotlb(&vdpasim->vqs[i].vring, iommu,
 610                                          &vdpasim->iommu_lock);
 611
 612         mutex_unlock(&vdpasim->mutex);
 613
 614         return 0;
 615 }
 616
 617 static int vdpasim_set_map(struct vdpa_device *vdpa, unsigned int asid,
 618                            struct vhost_iotlb *iotlb)
 619 {
 620         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 621         struct vhost_iotlb_map *map;
 622         struct vhost_iotlb *iommu;
 623         u64 start = 0ULL, last = 0ULL - 1;
 624         int ret;
 625
 626         if (asid >= vdpasim->dev_attr.nas)
 627                 return -EINVAL;
 628
 629         spin_lock(&vdpasim->iommu_lock);
 630
 631         iommu = &vdpasim->iommu[asid];
 632         vhost_iotlb_reset(iommu);
 633         vdpasim->iommu_pt[asid] = false;
 634
 635         for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
 636              map = vhost_iotlb_itree_next(map, start, last)) {
 637                 ret = vhost_iotlb_add_range(iommu, map->start,
 638                                             map->last, map->addr, map->perm);
 639                 if (ret)
 640                         goto err;
 641         }
 642         spin_unlock(&vdpasim->iommu_lock);
 643         return 0;
 644
 645 err:
 646         vhost_iotlb_reset(iommu);
 647         spin_unlock(&vdpasim->iommu_lock);
 648         return ret;
 649 }
 650
 651 static int vdpasim_reset_map(struct vdpa_device *vdpa, unsigned int asid)
 652 {
 653         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 654
 655         if (asid >= vdpasim->dev_attr.nas)
 656                 return -EINVAL;
 657
 658         spin_lock(&vdpasim->iommu_lock);
 659         if (vdpasim->iommu_pt[asid])
 660                 goto out;
 661         vhost_iotlb_reset(&vdpasim->iommu[asid]);
 662         vhost_iotlb_add_range(&vdpasim->iommu[asid], 0, ULONG_MAX,
 663                               0, VHOST_MAP_RW);
 664         vdpasim->iommu_pt[asid] = true;
 665 out:
 666         spin_unlock(&vdpasim->iommu_lock);
 667         return 0;
 668 }
 669
 670 static int vdpasim_bind_mm(struct vdpa_device *vdpa, struct mm_struct *mm)
 671 {
 672         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 673         struct vdpasim_mm_work mm_work;
 674
 675         mm_work.vdpasim = vdpasim;
 676         mm_work.mm_to_bind = mm;
 677
 678         vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
 679
 680         return mm_work.ret;
 681 }
 682
 683 static void vdpasim_unbind_mm(struct vdpa_device *vdpa)
 684 {
 685         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 686         struct vdpasim_mm_work mm_work;
 687
 688         mm_work.vdpasim = vdpasim;
 689         mm_work.mm_to_bind = NULL;
 690
 691         vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
 692 }
 693
 694 static int vdpasim_dma_map(struct vdpa_device *vdpa, unsigned int asid,
 695                            u64 iova, u64 size,
 696                            u64 pa, u32 perm, void *opaque)
 697 {
 698         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 699         int ret;
 700
 701         if (asid >= vdpasim->dev_attr.nas)
 702                 return -EINVAL;
 703
 704         spin_lock(&vdpasim->iommu_lock);
 705         if (vdpasim->iommu_pt[asid]) {
 706                 vhost_iotlb_reset(&vdpasim->iommu[asid]);
 707                 vdpasim->iommu_pt[asid] = false;
 708         }
 709         ret = vhost_iotlb_add_range_ctx(&vdpasim->iommu[asid], iova,
 710                                         iova + size - 1, pa, perm, opaque);
 711         spin_unlock(&vdpasim->iommu_lock);
 712
 713         return ret;
 714 }
 715
 716 static int vdpasim_dma_unmap(struct vdpa_device *vdpa, unsigned int asid,
 717                              u64 iova, u64 size)
 718 {
 719         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 720
 721         if (asid >= vdpasim->dev_attr.nas)
 722                 return -EINVAL;
 723
 724         if (vdpasim->iommu_pt[asid]) {
 725                 vhost_iotlb_reset(&vdpasim->iommu[asid]);
 726                 vdpasim->iommu_pt[asid] = false;
 727         }
 728
 729         spin_lock(&vdpasim->iommu_lock);
 730         vhost_iotlb_del_range(&vdpasim->iommu[asid], iova, iova + size - 1);
 731         spin_unlock(&vdpasim->iommu_lock);
 732
 733         return 0;
 734 }
 735
 736 static void vdpasim_free(struct vdpa_device *vdpa)
 737 {
 738         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 739         int i;
 740
 741         kthread_cancel_work_sync(&vdpasim->work);
 742         kthread_destroy_worker(vdpasim->worker);
 743
 744         for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
 745                 vringh_kiov_cleanup(&vdpasim->vqs[i].out_iov);
 746                 vringh_kiov_cleanup(&vdpasim->vqs[i].in_iov);
 747         }
 748
 749         vdpasim->dev_attr.free(vdpasim);
 750
 751         for (i = 0; i < vdpasim->dev_attr.nas; i++)
 752                 vhost_iotlb_reset(&vdpasim->iommu[i]);
 753         kfree(vdpasim->iommu);
 754         kfree(vdpasim->iommu_pt);
 755         kfree(vdpasim->vqs);
 756         kfree(vdpasim->config);
 757 }
 758
 759 static const struct vdpa_config_ops vdpasim_config_ops = {
 760         .set_vq_address         = vdpasim_set_vq_address,
 761         .set_vq_num             = vdpasim_set_vq_num,
 762         .kick_vq                = vdpasim_kick_vq,
 763         .set_vq_cb              = vdpasim_set_vq_cb,
 764         .set_vq_ready           = vdpasim_set_vq_ready,
 765         .get_vq_ready           = vdpasim_get_vq_ready,
 766         .set_vq_state           = vdpasim_set_vq_state,
 767         .get_vendor_vq_stats    = vdpasim_get_vq_stats,
 768         .get_vq_state           = vdpasim_get_vq_state,
 769         .get_vq_align           = vdpasim_get_vq_align,
 770         .get_vq_group           = vdpasim_get_vq_group,
 771         .get_device_features    = vdpasim_get_device_features,
 772         .get_backend_features   = vdpasim_get_backend_features,
 773         .set_driver_features    = vdpasim_set_driver_features,
 774         .get_driver_features    = vdpasim_get_driver_features,
 775         .set_config_cb          = vdpasim_set_config_cb,
 776         .get_vq_num_max         = vdpasim_get_vq_num_max,
 777         .get_device_id          = vdpasim_get_device_id,
 778         .get_vendor_id          = vdpasim_get_vendor_id,
 779         .get_status             = vdpasim_get_status,
 780         .set_status             = vdpasim_set_status,
 781         .reset                  = vdpasim_reset,
 782         .compat_reset           = vdpasim_compat_reset,
 783         .suspend                = vdpasim_suspend,
 784         .resume                 = vdpasim_resume,
 785         .get_config_size        = vdpasim_get_config_size,
 786         .get_config             = vdpasim_get_config,
 787         .set_config             = vdpasim_set_config,
 788         .get_generation         = vdpasim_get_generation,
 789         .get_iova_range         = vdpasim_get_iova_range,
 790         .set_group_asid         = vdpasim_set_group_asid,
 791         .dma_map                = vdpasim_dma_map,
 792         .dma_unmap              = vdpasim_dma_unmap,
 793         .reset_map              = vdpasim_reset_map,
 794         .bind_mm                = vdpasim_bind_mm,
 795         .unbind_mm              = vdpasim_unbind_mm,
 796         .free                   = vdpasim_free,
 797 };
 798
 799 static const struct vdpa_config_ops vdpasim_batch_config_ops = {
 800         .set_vq_address         = vdpasim_set_vq_address,
 801         .set_vq_num             = vdpasim_set_vq_num,
 802         .kick_vq                = vdpasim_kick_vq,
 803         .set_vq_cb              = vdpasim_set_vq_cb,
 804         .set_vq_ready           = vdpasim_set_vq_ready,
 805         .get_vq_ready           = vdpasim_get_vq_ready,
 806         .set_vq_state           = vdpasim_set_vq_state,
 807         .get_vendor_vq_stats    = vdpasim_get_vq_stats,
 808         .get_vq_state           = vdpasim_get_vq_state,
 809         .get_vq_align           = vdpasim_get_vq_align,
 810         .get_vq_group           = vdpasim_get_vq_group,
 811         .get_device_features    = vdpasim_get_device_features,
 812         .get_backend_features   = vdpasim_get_backend_features,
 813         .set_driver_features    = vdpasim_set_driver_features,
 814         .get_driver_features    = vdpasim_get_driver_features,
 815         .set_config_cb          = vdpasim_set_config_cb,
 816         .get_vq_num_max         = vdpasim_get_vq_num_max,
 817         .get_device_id          = vdpasim_get_device_id,
 818         .get_vendor_id          = vdpasim_get_vendor_id,
 819         .get_status             = vdpasim_get_status,
 820         .set_status             = vdpasim_set_status,
 821         .reset                  = vdpasim_reset,
 822         .compat_reset           = vdpasim_compat_reset,
 823         .suspend                = vdpasim_suspend,
 824         .resume                 = vdpasim_resume,
 825         .get_config_size        = vdpasim_get_config_size,
 826         .get_config             = vdpasim_get_config,
 827         .set_config             = vdpasim_set_config,
 828         .get_generation         = vdpasim_get_generation,
 829         .get_iova_range         = vdpasim_get_iova_range,
 830         .set_group_asid         = vdpasim_set_group_asid,
 831         .set_map                = vdpasim_set_map,
 832         .reset_map              = vdpasim_reset_map,
 833         .bind_mm                = vdpasim_bind_mm,
 834         .unbind_mm              = vdpasim_unbind_mm,
 835         .free                   = vdpasim_free,
 836 };
 837
 838 MODULE_VERSION(DRV_VERSION);
 839 MODULE_LICENSE(DRV_LICENSE);
 840 MODULE_AUTHOR(DRV_AUTHOR);
 841 MODULE_DESCRIPTION(DRV_DESC);