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 = false;
 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 u16 vdpasim_get_vq_size(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->status & VIRTIO_CONFIG_S_DRIVER_OK)
 320                 return vq->num;
 321         else
 322                 return VDPASIM_QUEUE_MAX;
 323 }
 324
 325 static void vdpasim_kick_vq(struct vdpa_device *vdpa, u16 idx)
 326 {
 327         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 328         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 329
 330         if (!vdpasim->running &&
 331             (vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 332                 vdpasim->pending_kick = true;
 333                 return;
 334         }
 335
 336         if (vq->ready)
 337                 vdpasim_schedule_work(vdpasim);
 338 }
 339
 340 static void vdpasim_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
 341                               struct vdpa_callback *cb)
 342 {
 343         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 344         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 345
 346         vq->cb = cb->callback;
 347         vq->private = cb->private;
 348 }
 349
 350 static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
 351 {
 352         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 353         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 354         bool old_ready;
 355
 356         mutex_lock(&vdpasim->mutex);
 357         old_ready = vq->ready;
 358         vq->ready = ready;
 359         if (vq->ready && !old_ready) {
 360                 vdpasim_queue_ready(vdpasim, idx);
 361         }
 362         mutex_unlock(&vdpasim->mutex);
 363 }
 364
 365 static bool vdpasim_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
 366 {
 367         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 368         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 369
 370         return vq->ready;
 371 }
 372
 373 static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
 374                                 const struct vdpa_vq_state *state)
 375 {
 376         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 377         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 378         struct vringh *vrh = &vq->vring;
 379
 380         mutex_lock(&vdpasim->mutex);
 381         vrh->last_avail_idx = state->split.avail_index;
 382         mutex_unlock(&vdpasim->mutex);
 383
 384         return 0;
 385 }
 386
 387 static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
 388                                 struct vdpa_vq_state *state)
 389 {
 390         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 391         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 392         struct vringh *vrh = &vq->vring;
 393
 394         state->split.avail_index = vrh->last_avail_idx;
 395         return 0;
 396 }
 397
 398 static int vdpasim_get_vq_stats(struct vdpa_device *vdpa, u16 idx,
 399                                 struct sk_buff *msg,
 400                                 struct netlink_ext_ack *extack)
 401 {
 402         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 403
 404         if (vdpasim->dev_attr.get_stats)
 405                 return vdpasim->dev_attr.get_stats(vdpasim, idx,
 406                                                    msg, extack);
 407         return -EOPNOTSUPP;
 408 }
 409
 410 static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
 411 {
 412         return VDPASIM_QUEUE_ALIGN;
 413 }
 414
 415 static u32 vdpasim_get_vq_group(struct vdpa_device *vdpa, u16 idx)
 416 {
 417         /* RX and TX belongs to group 0, CVQ belongs to group 1 */
 418         if (idx == 2)
 419                 return 1;
 420         else
 421                 return 0;
 422 }
 423
 424 static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
 425 {
 426         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 427
 428         return vdpasim->dev_attr.supported_features;
 429 }
 430
 431 static u64 vdpasim_get_backend_features(const struct vdpa_device *vdpa)
 432 {
 433         return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK);
 434 }
 435
 436 static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)
 437 {
 438         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 439
 440         /* DMA mapping must be done by driver */
 441         if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
 442                 return -EINVAL;
 443
 444         vdpasim->features = features & vdpasim->dev_attr.supported_features;
 445
 446         return 0;
 447 }
 448
 449 static u64 vdpasim_get_driver_features(struct vdpa_device *vdpa)
 450 {
 451         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 452
 453         return vdpasim->features;
 454 }
 455
 456 static void vdpasim_set_config_cb(struct vdpa_device *vdpa,
 457                                   struct vdpa_callback *cb)
 458 {
 459         /* We don't support config interrupt */
 460 }
 461
 462 static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa)
 463 {
 464         return VDPASIM_QUEUE_MAX;
 465 }
 466
 467 static u32 vdpasim_get_device_id(struct vdpa_device *vdpa)
 468 {
 469         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 470
 471         return vdpasim->dev_attr.id;
 472 }
 473
 474 static u32 vdpasim_get_vendor_id(struct vdpa_device *vdpa)
 475 {
 476         return VDPASIM_VENDOR_ID;
 477 }
 478
 479 static u8 vdpasim_get_status(struct vdpa_device *vdpa)
 480 {
 481         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 482         u8 status;
 483
 484         mutex_lock(&vdpasim->mutex);
 485         status = vdpasim->status;
 486         mutex_unlock(&vdpasim->mutex);
 487
 488         return status;
 489 }
 490
 491 static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
 492 {
 493         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 494
 495         mutex_lock(&vdpasim->mutex);
 496         vdpasim->status = status;
 497         vdpasim->running = (status & VIRTIO_CONFIG_S_DRIVER_OK) != 0;
 498         mutex_unlock(&vdpasim->mutex);
 499 }
 500
 501 static int vdpasim_compat_reset(struct vdpa_device *vdpa, u32 flags)
 502 {
 503         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 504
 505         mutex_lock(&vdpasim->mutex);
 506         vdpasim->status = 0;
 507         vdpasim_do_reset(vdpasim, flags);
 508         mutex_unlock(&vdpasim->mutex);
 509
 510         return 0;
 511 }
 512
 513 static int vdpasim_reset(struct vdpa_device *vdpa)
 514 {
 515         return vdpasim_compat_reset(vdpa, 0);
 516 }
 517
 518 static int vdpasim_suspend(struct vdpa_device *vdpa)
 519 {
 520         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 521
 522         mutex_lock(&vdpasim->mutex);
 523         vdpasim->running = false;
 524         mutex_unlock(&vdpasim->mutex);
 525
 526         return 0;
 527 }
 528
 529 static int vdpasim_resume(struct vdpa_device *vdpa)
 530 {
 531         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 532         int i;
 533
 534         mutex_lock(&vdpasim->mutex);
 535         vdpasim->running = true;
 536
 537         if (vdpasim->pending_kick) {
 538                 /* Process pending descriptors */
 539                 for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
 540                         vdpasim_kick_vq(vdpa, i);
 541
 542                 vdpasim->pending_kick = false;
 543         }
 544
 545         mutex_unlock(&vdpasim->mutex);
 546
 547         return 0;
 548 }
 549
 550 static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
 551 {
 552         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 553
 554         return vdpasim->dev_attr.config_size;
 555 }
 556
 557 static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
 558                              void *buf, unsigned int len)
 559 {
 560         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 561
 562         if (offset + len > vdpasim->dev_attr.config_size)
 563                 return;
 564
 565         if (vdpasim->dev_attr.get_config)
 566                 vdpasim->dev_attr.get_config(vdpasim, vdpasim->config);
 567
 568         memcpy(buf, vdpasim->config + offset, len);
 569 }
 570
 571 static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
 572                              const void *buf, unsigned int len)
 573 {
 574         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 575
 576         if (offset + len > vdpasim->dev_attr.config_size)
 577                 return;
 578
 579         memcpy(vdpasim->config + offset, buf, len);
 580
 581         if (vdpasim->dev_attr.set_config)
 582                 vdpasim->dev_attr.set_config(vdpasim, vdpasim->config);
 583 }
 584
 585 static u32 vdpasim_get_generation(struct vdpa_device *vdpa)
 586 {
 587         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 588
 589         return vdpasim->generation;
 590 }
 591
 592 static struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa)
 593 {
 594         struct vdpa_iova_range range = {
 595                 .first = 0ULL,
 596                 .last = ULLONG_MAX,
 597         };
 598
 599         return range;
 600 }
 601
 602 static int vdpasim_set_group_asid(struct vdpa_device *vdpa, unsigned int group,
 603                                   unsigned int asid)
 604 {
 605         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 606         struct vhost_iotlb *iommu;
 607         int i;
 608
 609         if (group > vdpasim->dev_attr.ngroups)
 610                 return -EINVAL;
 611
 612         if (asid >= vdpasim->dev_attr.nas)
 613                 return -EINVAL;
 614
 615         iommu = &vdpasim->iommu[asid];
 616
 617         mutex_lock(&vdpasim->mutex);
 618
 619         for (i = 0; i < vdpasim->dev_attr.nvqs; i++)
 620                 if (vdpasim_get_vq_group(vdpa, i) == group)
 621                         vringh_set_iotlb(&vdpasim->vqs[i].vring, iommu,
 622                                          &vdpasim->iommu_lock);
 623
 624         mutex_unlock(&vdpasim->mutex);
 625
 626         return 0;
 627 }
 628
 629 static int vdpasim_set_map(struct vdpa_device *vdpa, unsigned int asid,
 630                            struct vhost_iotlb *iotlb)
 631 {
 632         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 633         struct vhost_iotlb_map *map;
 634         struct vhost_iotlb *iommu;
 635         u64 start = 0ULL, last = 0ULL - 1;
 636         int ret;
 637
 638         if (asid >= vdpasim->dev_attr.nas)
 639                 return -EINVAL;
 640
 641         spin_lock(&vdpasim->iommu_lock);
 642
 643         iommu = &vdpasim->iommu[asid];
 644         vhost_iotlb_reset(iommu);
 645         vdpasim->iommu_pt[asid] = false;
 646
 647         for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
 648              map = vhost_iotlb_itree_next(map, start, last)) {
 649                 ret = vhost_iotlb_add_range(iommu, map->start,
 650                                             map->last, map->addr, map->perm);
 651                 if (ret)
 652                         goto err;
 653         }
 654         spin_unlock(&vdpasim->iommu_lock);
 655         return 0;
 656
 657 err:
 658         vhost_iotlb_reset(iommu);
 659         spin_unlock(&vdpasim->iommu_lock);
 660         return ret;
 661 }
 662
 663 static int vdpasim_reset_map(struct vdpa_device *vdpa, unsigned int asid)
 664 {
 665         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 666
 667         if (asid >= vdpasim->dev_attr.nas)
 668                 return -EINVAL;
 669
 670         spin_lock(&vdpasim->iommu_lock);
 671         if (vdpasim->iommu_pt[asid])
 672                 goto out;
 673         vhost_iotlb_reset(&vdpasim->iommu[asid]);
 674         vhost_iotlb_add_range(&vdpasim->iommu[asid], 0, ULONG_MAX,
 675                               0, VHOST_MAP_RW);
 676         vdpasim->iommu_pt[asid] = true;
 677 out:
 678         spin_unlock(&vdpasim->iommu_lock);
 679         return 0;
 680 }
 681
 682 static int vdpasim_bind_mm(struct vdpa_device *vdpa, struct mm_struct *mm)
 683 {
 684         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 685         struct vdpasim_mm_work mm_work;
 686
 687         mm_work.vdpasim = vdpasim;
 688         mm_work.mm_to_bind = mm;
 689
 690         vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
 691
 692         return mm_work.ret;
 693 }
 694
 695 static void vdpasim_unbind_mm(struct vdpa_device *vdpa)
 696 {
 697         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 698         struct vdpasim_mm_work mm_work;
 699
 700         mm_work.vdpasim = vdpasim;
 701         mm_work.mm_to_bind = NULL;
 702
 703         vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
 704 }
 705
 706 static int vdpasim_dma_map(struct vdpa_device *vdpa, unsigned int asid,
 707                            u64 iova, u64 size,
 708                            u64 pa, u32 perm, void *opaque)
 709 {
 710         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 711         int ret;
 712
 713         if (asid >= vdpasim->dev_attr.nas)
 714                 return -EINVAL;
 715
 716         spin_lock(&vdpasim->iommu_lock);
 717         if (vdpasim->iommu_pt[asid]) {
 718                 vhost_iotlb_reset(&vdpasim->iommu[asid]);
 719                 vdpasim->iommu_pt[asid] = false;
 720         }
 721         ret = vhost_iotlb_add_range_ctx(&vdpasim->iommu[asid], iova,
 722                                         iova + size - 1, pa, perm, opaque);
 723         spin_unlock(&vdpasim->iommu_lock);
 724
 725         return ret;
 726 }
 727
 728 static int vdpasim_dma_unmap(struct vdpa_device *vdpa, unsigned int asid,
 729                              u64 iova, u64 size)
 730 {
 731         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 732
 733         if (asid >= vdpasim->dev_attr.nas)
 734                 return -EINVAL;
 735
 736         if (vdpasim->iommu_pt[asid]) {
 737                 vhost_iotlb_reset(&vdpasim->iommu[asid]);
 738                 vdpasim->iommu_pt[asid] = false;
 739         }
 740
 741         spin_lock(&vdpasim->iommu_lock);
 742         vhost_iotlb_del_range(&vdpasim->iommu[asid], iova, iova + size - 1);
 743         spin_unlock(&vdpasim->iommu_lock);
 744
 745         return 0;
 746 }
 747
 748 static void vdpasim_free(struct vdpa_device *vdpa)
 749 {
 750         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 751         int i;
 752
 753         kthread_cancel_work_sync(&vdpasim->work);
 754         kthread_destroy_worker(vdpasim->worker);
 755
 756         for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
 757                 vringh_kiov_cleanup(&vdpasim->vqs[i].out_iov);
 758                 vringh_kiov_cleanup(&vdpasim->vqs[i].in_iov);
 759         }
 760
 761         vdpasim->dev_attr.free(vdpasim);
 762
 763         for (i = 0; i < vdpasim->dev_attr.nas; i++)
 764                 vhost_iotlb_reset(&vdpasim->iommu[i]);
 765         kfree(vdpasim->iommu);
 766         kfree(vdpasim->iommu_pt);
 767         kfree(vdpasim->vqs);
 768         kfree(vdpasim->config);
 769 }
 770
 771 static const struct vdpa_config_ops vdpasim_config_ops = {
 772         .set_vq_address         = vdpasim_set_vq_address,
 773         .set_vq_num             = vdpasim_set_vq_num,
 774         .kick_vq                = vdpasim_kick_vq,
 775         .set_vq_cb              = vdpasim_set_vq_cb,
 776         .set_vq_ready           = vdpasim_set_vq_ready,
 777         .get_vq_ready           = vdpasim_get_vq_ready,
 778         .set_vq_state           = vdpasim_set_vq_state,
 779         .get_vendor_vq_stats    = vdpasim_get_vq_stats,
 780         .get_vq_state           = vdpasim_get_vq_state,
 781         .get_vq_align           = vdpasim_get_vq_align,
 782         .get_vq_group           = vdpasim_get_vq_group,
 783         .get_device_features    = vdpasim_get_device_features,
 784         .get_backend_features   = vdpasim_get_backend_features,
 785         .set_driver_features    = vdpasim_set_driver_features,
 786         .get_driver_features    = vdpasim_get_driver_features,
 787         .set_config_cb          = vdpasim_set_config_cb,
 788         .get_vq_num_max         = vdpasim_get_vq_num_max,
 789         .get_vq_size            = vdpasim_get_vq_size,
 790         .get_device_id          = vdpasim_get_device_id,
 791         .get_vendor_id          = vdpasim_get_vendor_id,
 792         .get_status             = vdpasim_get_status,
 793         .set_status             = vdpasim_set_status,
 794         .reset                  = vdpasim_reset,
 795         .compat_reset           = vdpasim_compat_reset,
 796         .suspend                = vdpasim_suspend,
 797         .resume                 = vdpasim_resume,
 798         .get_config_size        = vdpasim_get_config_size,
 799         .get_config             = vdpasim_get_config,
 800         .set_config             = vdpasim_set_config,
 801         .get_generation         = vdpasim_get_generation,
 802         .get_iova_range         = vdpasim_get_iova_range,
 803         .set_group_asid         = vdpasim_set_group_asid,
 804         .dma_map                = vdpasim_dma_map,
 805         .dma_unmap              = vdpasim_dma_unmap,
 806         .reset_map              = vdpasim_reset_map,
 807         .bind_mm                = vdpasim_bind_mm,
 808         .unbind_mm              = vdpasim_unbind_mm,
 809         .free                   = vdpasim_free,
 810 };
 811
 812 static const struct vdpa_config_ops vdpasim_batch_config_ops = {
 813         .set_vq_address         = vdpasim_set_vq_address,
 814         .set_vq_num             = vdpasim_set_vq_num,
 815         .kick_vq                = vdpasim_kick_vq,
 816         .set_vq_cb              = vdpasim_set_vq_cb,
 817         .set_vq_ready           = vdpasim_set_vq_ready,
 818         .get_vq_ready           = vdpasim_get_vq_ready,
 819         .set_vq_state           = vdpasim_set_vq_state,
 820         .get_vendor_vq_stats    = vdpasim_get_vq_stats,
 821         .get_vq_state           = vdpasim_get_vq_state,
 822         .get_vq_align           = vdpasim_get_vq_align,
 823         .get_vq_group           = vdpasim_get_vq_group,
 824         .get_device_features    = vdpasim_get_device_features,
 825         .get_backend_features   = vdpasim_get_backend_features,
 826         .set_driver_features    = vdpasim_set_driver_features,
 827         .get_driver_features    = vdpasim_get_driver_features,
 828         .set_config_cb          = vdpasim_set_config_cb,
 829         .get_vq_num_max         = vdpasim_get_vq_num_max,
 830         .get_device_id          = vdpasim_get_device_id,
 831         .get_vendor_id          = vdpasim_get_vendor_id,
 832         .get_status             = vdpasim_get_status,
 833         .set_status             = vdpasim_set_status,
 834         .reset                  = vdpasim_reset,
 835         .compat_reset           = vdpasim_compat_reset,
 836         .suspend                = vdpasim_suspend,
 837         .resume                 = vdpasim_resume,
 838         .get_config_size        = vdpasim_get_config_size,
 839         .get_config             = vdpasim_get_config,
 840         .set_config             = vdpasim_set_config,
 841         .get_generation         = vdpasim_get_generation,
 842         .get_iova_range         = vdpasim_get_iova_range,
 843         .set_group_asid         = vdpasim_set_group_asid,
 844         .set_map                = vdpasim_set_map,
 845         .reset_map              = vdpasim_reset_map,
 846         .bind_mm                = vdpasim_bind_mm,
 847         .unbind_mm              = vdpasim_unbind_mm,
 848         .free                   = vdpasim_free,
 849 };
 850
 851 MODULE_VERSION(DRV_VERSION);
 852 MODULE_LICENSE(DRV_LICENSE);
 853 MODULE_AUTHOR(DRV_AUTHOR);
 854 MODULE_DESCRIPTION(DRV_DESC);