drivers/vdpa/vdpa_sim/vdpa_sim.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VDPA networking device simulator.
   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/fs.h>
  15 #include <linux/poll.h>
  16 #include <linux/slab.h>
  17 #include <linux/sched.h>
  18 #include <linux/wait.h>
  19 #include <linux/uuid.h>
  20 #include <linux/iommu.h>
  21 #include <linux/dma-map-ops.h>
  22 #include <linux/sysfs.h>
  23 #include <linux/file.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/vringh.h>
  26 #include <linux/vdpa.h>
  27 #include <linux/virtio_byteorder.h>
  28 #include <linux/vhost_iotlb.h>
  29 #include <uapi/linux/virtio_config.h>
  30 #include <uapi/linux/virtio_net.h>
  31
  32 #define DRV_VERSION  "0.1"
  33 #define DRV_AUTHOR   "Jason Wang <jasowang@redhat.com>"
  34 #define DRV_DESC     "vDPA Device Simulator"
  35 #define DRV_LICENSE  "GPL v2"
  36
  37 static int batch_mapping = 1;
  38 module_param(batch_mapping, int, 0444);
  39 MODULE_PARM_DESC(batch_mapping, "Batched mapping 1 -Enable; 0 - Disable");
  40
  41 static char *macaddr;
  42 module_param(macaddr, charp, 0);
  43 MODULE_PARM_DESC(macaddr, "Ethernet MAC address");
  44
  45 struct vdpasim_virtqueue {
  46         struct vringh vring;
  47         struct vringh_kiov iov;
  48         unsigned short head;
  49         bool ready;
  50         u64 desc_addr;
  51         u64 device_addr;
  52         u64 driver_addr;
  53         u32 num;
  54         void *private;
  55         irqreturn_t (*cb)(void *data);
  56 };
  57
  58 #define VDPASIM_QUEUE_ALIGN PAGE_SIZE
  59 #define VDPASIM_QUEUE_MAX 256
  60 #define VDPASIM_DEVICE_ID 0x1
  61 #define VDPASIM_VENDOR_ID 0
  62 #define VDPASIM_VQ_NUM 0x2
  63 #define VDPASIM_NAME "vdpasim-netdev"
  64
  65 static u64 vdpasim_features = (1ULL << VIRTIO_F_ANY_LAYOUT) |
  66                               (1ULL << VIRTIO_F_VERSION_1)  |
  67                               (1ULL << VIRTIO_F_ACCESS_PLATFORM) |
  68                               (1ULL << VIRTIO_NET_F_MAC);
  69
  70 /* State of each vdpasim device */
  71 struct vdpasim {
  72         struct vdpa_device vdpa;
  73         struct vdpasim_virtqueue vqs[VDPASIM_VQ_NUM];
  74         struct work_struct work;
  75         /* spinlock to synchronize virtqueue state */
  76         spinlock_t lock;
  77         struct virtio_net_config config;
  78         struct vhost_iotlb *iommu;
  79         void *buffer;
  80         u32 status;
  81         u32 generation;
  82         u64 features;
  83         /* spinlock to synchronize iommu table */
  84         spinlock_t iommu_lock;
  85 };
  86
  87 /* TODO: cross-endian support */
  88 static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
  89 {
  90         return virtio_legacy_is_little_endian() ||
  91                 (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
  92 }
  93
  94 static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
  95 {
  96         return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
  97 }
  98
  99 static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
 100 {
 101         return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
 102 }
 103
 104 static struct vdpasim *vdpasim_dev;
 105
 106 static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa)
 107 {
 108         return container_of(vdpa, struct vdpasim, vdpa);
 109 }
 110
 111 static struct vdpasim *dev_to_sim(struct device *dev)
 112 {
 113         struct vdpa_device *vdpa = dev_to_vdpa(dev);
 114
 115         return vdpa_to_sim(vdpa);
 116 }
 117
 118 static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
 119 {
 120         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 121
 122         vringh_init_iotlb(&vq->vring, vdpasim_features,
 123                           VDPASIM_QUEUE_MAX, false,
 124                           (struct vring_desc *)(uintptr_t)vq->desc_addr,
 125                           (struct vring_avail *)
 126                           (uintptr_t)vq->driver_addr,
 127                           (struct vring_used *)
 128                           (uintptr_t)vq->device_addr);
 129 }
 130
 131 static void vdpasim_vq_reset(struct vdpasim_virtqueue *vq)
 132 {
 133         vq->ready = false;
 134         vq->desc_addr = 0;
 135         vq->driver_addr = 0;
 136         vq->device_addr = 0;
 137         vq->cb = NULL;
 138         vq->private = NULL;
 139         vringh_init_iotlb(&vq->vring, vdpasim_features, VDPASIM_QUEUE_MAX,
 140                           false, NULL, NULL, NULL);
 141 }
 142
 143 static void vdpasim_reset(struct vdpasim *vdpasim)
 144 {
 145         int i;
 146
 147         for (i = 0; i < VDPASIM_VQ_NUM; i++)
 148                 vdpasim_vq_reset(&vdpasim->vqs[i]);
 149
 150         spin_lock(&vdpasim->iommu_lock);
 151         vhost_iotlb_reset(vdpasim->iommu);
 152         spin_unlock(&vdpasim->iommu_lock);
 153
 154         vdpasim->features = 0;
 155         vdpasim->status = 0;
 156         ++vdpasim->generation;
 157 }
 158
 159 static void vdpasim_work(struct work_struct *work)
 160 {
 161         struct vdpasim *vdpasim = container_of(work, struct
 162                                                  vdpasim, work);
 163         struct vdpasim_virtqueue *txq = &vdpasim->vqs[1];
 164         struct vdpasim_virtqueue *rxq = &vdpasim->vqs[0];
 165         ssize_t read, write;
 166         size_t total_write;
 167         int pkts = 0;
 168         int err;
 169
 170         spin_lock(&vdpasim->lock);
 171
 172         if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
 173                 goto out;
 174
 175         if (!txq->ready || !rxq->ready)
 176                 goto out;
 177
 178         while (true) {
 179                 total_write = 0;
 180                 err = vringh_getdesc_iotlb(&txq->vring, &txq->iov, NULL,
 181                                            &txq->head, GFP_ATOMIC);
 182                 if (err <= 0)
 183                         break;
 184
 185                 err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->iov,
 186                                            &rxq->head, GFP_ATOMIC);
 187                 if (err <= 0) {
 188                         vringh_complete_iotlb(&txq->vring, txq->head, 0);
 189                         break;
 190                 }
 191
 192                 while (true) {
 193                         read = vringh_iov_pull_iotlb(&txq->vring, &txq->iov,
 194                                                      vdpasim->buffer,
 195                                                      PAGE_SIZE);
 196                         if (read <= 0)
 197                                 break;
 198
 199                         write = vringh_iov_push_iotlb(&rxq->vring, &rxq->iov,
 200                                                       vdpasim->buffer, read);
 201                         if (write <= 0)
 202                                 break;
 203
 204                         total_write += write;
 205                 }
 206
 207                 /* Make sure data is wrote before advancing index */
 208                 smp_wmb();
 209
 210                 vringh_complete_iotlb(&txq->vring, txq->head, 0);
 211                 vringh_complete_iotlb(&rxq->vring, rxq->head, total_write);
 212
 213                 /* Make sure used is visible before rasing the interrupt. */
 214                 smp_wmb();
 215
 216                 local_bh_disable();
 217                 if (txq->cb)
 218                         txq->cb(txq->private);
 219                 if (rxq->cb)
 220                         rxq->cb(rxq->private);
 221                 local_bh_enable();
 222
 223                 if (++pkts > 4) {
 224                         schedule_work(&vdpasim->work);
 225                         goto out;
 226                 }
 227         }
 228
 229 out:
 230         spin_unlock(&vdpasim->lock);
 231 }
 232
 233 static int dir_to_perm(enum dma_data_direction dir)
 234 {
 235         int perm = -EFAULT;
 236
 237         switch (dir) {
 238         case DMA_FROM_DEVICE:
 239                 perm = VHOST_MAP_WO;
 240                 break;
 241         case DMA_TO_DEVICE:
 242                 perm = VHOST_MAP_RO;
 243                 break;
 244         case DMA_BIDIRECTIONAL:
 245                 perm = VHOST_MAP_RW;
 246                 break;
 247         default:
 248                 break;
 249         }
 250
 251         return perm;
 252 }
 253
 254 static dma_addr_t vdpasim_map_page(struct device *dev, struct page *page,
 255                                    unsigned long offset, size_t size,
 256                                    enum dma_data_direction dir,
 257                                    unsigned long attrs)
 258 {
 259         struct vdpasim *vdpasim = dev_to_sim(dev);
 260         struct vhost_iotlb *iommu = vdpasim->iommu;
 261         u64 pa = (page_to_pfn(page) << PAGE_SHIFT) + offset;
 262         int ret, perm = dir_to_perm(dir);
 263
 264         if (perm < 0)
 265                 return DMA_MAPPING_ERROR;
 266
 267         /* For simplicity, use identical mapping to avoid e.g iova
 268          * allocator.
 269          */
 270         spin_lock(&vdpasim->iommu_lock);
 271         ret = vhost_iotlb_add_range(iommu, pa, pa + size - 1,
 272                                     pa, dir_to_perm(dir));
 273         spin_unlock(&vdpasim->iommu_lock);
 274         if (ret)
 275                 return DMA_MAPPING_ERROR;
 276
 277         return (dma_addr_t)(pa);
 278 }
 279
 280 static void vdpasim_unmap_page(struct device *dev, dma_addr_t dma_addr,
 281                                size_t size, enum dma_data_direction dir,
 282                                unsigned long attrs)
 283 {
 284         struct vdpasim *vdpasim = dev_to_sim(dev);
 285         struct vhost_iotlb *iommu = vdpasim->iommu;
 286
 287         spin_lock(&vdpasim->iommu_lock);
 288         vhost_iotlb_del_range(iommu, (u64)dma_addr,
 289                               (u64)dma_addr + size - 1);
 290         spin_unlock(&vdpasim->iommu_lock);
 291 }
 292
 293 static void *vdpasim_alloc_coherent(struct device *dev, size_t size,
 294                                     dma_addr_t *dma_addr, gfp_t flag,
 295                                     unsigned long attrs)
 296 {
 297         struct vdpasim *vdpasim = dev_to_sim(dev);
 298         struct vhost_iotlb *iommu = vdpasim->iommu;
 299         void *addr = kmalloc(size, flag);
 300         int ret;
 301
 302         spin_lock(&vdpasim->iommu_lock);
 303         if (!addr) {
 304                 *dma_addr = DMA_MAPPING_ERROR;
 305         } else {
 306                 u64 pa = virt_to_phys(addr);
 307
 308                 ret = vhost_iotlb_add_range(iommu, (u64)pa,
 309                                             (u64)pa + size - 1,
 310                                             pa, VHOST_MAP_RW);
 311                 if (ret) {
 312                         *dma_addr = DMA_MAPPING_ERROR;
 313                         kfree(addr);
 314                         addr = NULL;
 315                 } else
 316                         *dma_addr = (dma_addr_t)pa;
 317         }
 318         spin_unlock(&vdpasim->iommu_lock);
 319
 320         return addr;
 321 }
 322
 323 static void vdpasim_free_coherent(struct device *dev, size_t size,
 324                                   void *vaddr, dma_addr_t dma_addr,
 325                                   unsigned long attrs)
 326 {
 327         struct vdpasim *vdpasim = dev_to_sim(dev);
 328         struct vhost_iotlb *iommu = vdpasim->iommu;
 329
 330         spin_lock(&vdpasim->iommu_lock);
 331         vhost_iotlb_del_range(iommu, (u64)dma_addr,
 332                               (u64)dma_addr + size - 1);
 333         spin_unlock(&vdpasim->iommu_lock);
 334
 335         kfree(phys_to_virt((uintptr_t)dma_addr));
 336 }
 337
 338 static const struct dma_map_ops vdpasim_dma_ops = {
 339         .map_page = vdpasim_map_page,
 340         .unmap_page = vdpasim_unmap_page,
 341         .alloc = vdpasim_alloc_coherent,
 342         .free = vdpasim_free_coherent,
 343 };
 344
 345 static const struct vdpa_config_ops vdpasim_net_config_ops;
 346 static const struct vdpa_config_ops vdpasim_net_batch_config_ops;
 347
 348 static struct vdpasim *vdpasim_create(void)
 349 {
 350         const struct vdpa_config_ops *ops;
 351         struct vdpasim *vdpasim;
 352         struct device *dev;
 353         int ret = -ENOMEM;
 354
 355         if (batch_mapping)
 356                 ops = &vdpasim_net_batch_config_ops;
 357         else
 358                 ops = &vdpasim_net_config_ops;
 359
 360         vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, VDPASIM_VQ_NUM);
 361         if (!vdpasim)
 362                 goto err_alloc;
 363
 364         INIT_WORK(&vdpasim->work, vdpasim_work);
 365         spin_lock_init(&vdpasim->lock);
 366         spin_lock_init(&vdpasim->iommu_lock);
 367
 368         dev = &vdpasim->vdpa.dev;
 369         dev->dma_mask = &dev->coherent_dma_mask;
 370         if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)))
 371                 goto err_iommu;
 372         set_dma_ops(dev, &vdpasim_dma_ops);
 373
 374         vdpasim->iommu = vhost_iotlb_alloc(2048, 0);
 375         if (!vdpasim->iommu)
 376                 goto err_iommu;
 377
 378         vdpasim->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
 379         if (!vdpasim->buffer)
 380                 goto err_iommu;
 381
 382         if (macaddr) {
 383                 mac_pton(macaddr, vdpasim->config.mac);
 384                 if (!is_valid_ether_addr(vdpasim->config.mac)) {
 385                         ret = -EADDRNOTAVAIL;
 386                         goto err_iommu;
 387                 }
 388         } else {
 389                 eth_random_addr(vdpasim->config.mac);
 390         }
 391
 392         vringh_set_iotlb(&vdpasim->vqs[0].vring, vdpasim->iommu);
 393         vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu);
 394
 395         vdpasim->vdpa.dma_dev = dev;
 396         ret = vdpa_register_device(&vdpasim->vdpa);
 397         if (ret)
 398                 goto err_iommu;
 399
 400         return vdpasim;
 401
 402 err_iommu:
 403         put_device(dev);
 404 err_alloc:
 405         return ERR_PTR(ret);
 406 }
 407
 408 static int vdpasim_set_vq_address(struct vdpa_device *vdpa, u16 idx,
 409                                   u64 desc_area, u64 driver_area,
 410                                   u64 device_area)
 411 {
 412         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 413         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 414
 415         vq->desc_addr = desc_area;
 416         vq->driver_addr = driver_area;
 417         vq->device_addr = device_area;
 418
 419         return 0;
 420 }
 421
 422 static void vdpasim_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num)
 423 {
 424         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 425         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 426
 427         vq->num = num;
 428 }
 429
 430 static void vdpasim_kick_vq(struct vdpa_device *vdpa, u16 idx)
 431 {
 432         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 433         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 434
 435         if (vq->ready)
 436                 schedule_work(&vdpasim->work);
 437 }
 438
 439 static void vdpasim_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
 440                               struct vdpa_callback *cb)
 441 {
 442         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 443         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 444
 445         vq->cb = cb->callback;
 446         vq->private = cb->private;
 447 }
 448
 449 static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
 450 {
 451         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 452         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 453
 454         spin_lock(&vdpasim->lock);
 455         vq->ready = ready;
 456         if (vq->ready)
 457                 vdpasim_queue_ready(vdpasim, idx);
 458         spin_unlock(&vdpasim->lock);
 459 }
 460
 461 static bool vdpasim_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
 462 {
 463         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 464         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 465
 466         return vq->ready;
 467 }
 468
 469 static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
 470                                 const struct vdpa_vq_state *state)
 471 {
 472         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 473         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 474         struct vringh *vrh = &vq->vring;
 475
 476         spin_lock(&vdpasim->lock);
 477         vrh->last_avail_idx = state->avail_index;
 478         spin_unlock(&vdpasim->lock);
 479
 480         return 0;
 481 }
 482
 483 static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
 484                                 struct vdpa_vq_state *state)
 485 {
 486         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 487         struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 488         struct vringh *vrh = &vq->vring;
 489
 490         state->avail_index = vrh->last_avail_idx;
 491         return 0;
 492 }
 493
 494 static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
 495 {
 496         return VDPASIM_QUEUE_ALIGN;
 497 }
 498
 499 static u64 vdpasim_get_features(struct vdpa_device *vdpa)
 500 {
 501         return vdpasim_features;
 502 }
 503
 504 static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
 505 {
 506         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 507         struct virtio_net_config *config = &vdpasim->config;
 508
 509         /* DMA mapping must be done by driver */
 510         if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
 511                 return -EINVAL;
 512
 513         vdpasim->features = features & vdpasim_features;
 514
 515         /* We generally only know whether guest is using the legacy interface
 516          * here, so generally that's the earliest we can set config fields.
 517          * Note: We actually require VIRTIO_F_ACCESS_PLATFORM above which
 518          * implies VIRTIO_F_VERSION_1, but let's not try to be clever here.
 519          */
 520
 521         config->mtu = cpu_to_vdpasim16(vdpasim, 1500);
 522         config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);
 523         return 0;
 524 }
 525
 526 static void vdpasim_set_config_cb(struct vdpa_device *vdpa,
 527                                   struct vdpa_callback *cb)
 528 {
 529         /* We don't support config interrupt */
 530 }
 531
 532 static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa)
 533 {
 534         return VDPASIM_QUEUE_MAX;
 535 }
 536
 537 static u32 vdpasim_get_device_id(struct vdpa_device *vdpa)
 538 {
 539         return VDPASIM_DEVICE_ID;
 540 }
 541
 542 static u32 vdpasim_get_vendor_id(struct vdpa_device *vdpa)
 543 {
 544         return VDPASIM_VENDOR_ID;
 545 }
 546
 547 static u8 vdpasim_get_status(struct vdpa_device *vdpa)
 548 {
 549         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 550         u8 status;
 551
 552         spin_lock(&vdpasim->lock);
 553         status = vdpasim->status;
 554         spin_unlock(&vdpasim->lock);
 555
 556         return status;
 557 }
 558
 559 static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
 560 {
 561         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 562
 563         spin_lock(&vdpasim->lock);
 564         vdpasim->status = status;
 565         if (status == 0)
 566                 vdpasim_reset(vdpasim);
 567         spin_unlock(&vdpasim->lock);
 568 }
 569
 570 static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
 571                              void *buf, unsigned int len)
 572 {
 573         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 574
 575         if (offset + len < sizeof(struct virtio_net_config))
 576                 memcpy(buf, (u8 *)&vdpasim->config + offset, len);
 577 }
 578
 579 static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
 580                              const void *buf, unsigned int len)
 581 {
 582         /* No writable config supportted by vdpasim */
 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_map(struct vdpa_device *vdpa,
 603                            struct vhost_iotlb *iotlb)
 604 {
 605         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 606         struct vhost_iotlb_map *map;
 607         u64 start = 0ULL, last = 0ULL - 1;
 608         int ret;
 609
 610         spin_lock(&vdpasim->iommu_lock);
 611         vhost_iotlb_reset(vdpasim->iommu);
 612
 613         for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
 614              map = vhost_iotlb_itree_next(map, start, last)) {
 615                 ret = vhost_iotlb_add_range(vdpasim->iommu, map->start,
 616                                             map->last, map->addr, map->perm);
 617                 if (ret)
 618                         goto err;
 619         }
 620         spin_unlock(&vdpasim->iommu_lock);
 621         return 0;
 622
 623 err:
 624         vhost_iotlb_reset(vdpasim->iommu);
 625         spin_unlock(&vdpasim->iommu_lock);
 626         return ret;
 627 }
 628
 629 static int vdpasim_dma_map(struct vdpa_device *vdpa, u64 iova, u64 size,
 630                            u64 pa, u32 perm)
 631 {
 632         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 633         int ret;
 634
 635         spin_lock(&vdpasim->iommu_lock);
 636         ret = vhost_iotlb_add_range(vdpasim->iommu, iova, iova + size - 1, pa,
 637                                     perm);
 638         spin_unlock(&vdpasim->iommu_lock);
 639
 640         return ret;
 641 }
 642
 643 static int vdpasim_dma_unmap(struct vdpa_device *vdpa, u64 iova, u64 size)
 644 {
 645         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 646
 647         spin_lock(&vdpasim->iommu_lock);
 648         vhost_iotlb_del_range(vdpasim->iommu, iova, iova + size - 1);
 649         spin_unlock(&vdpasim->iommu_lock);
 650
 651         return 0;
 652 }
 653
 654 static void vdpasim_free(struct vdpa_device *vdpa)
 655 {
 656         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 657
 658         cancel_work_sync(&vdpasim->work);
 659         kfree(vdpasim->buffer);
 660         if (vdpasim->iommu)
 661                 vhost_iotlb_free(vdpasim->iommu);
 662 }
 663
 664 static const struct vdpa_config_ops vdpasim_net_config_ops = {
 665         .set_vq_address         = vdpasim_set_vq_address,
 666         .set_vq_num             = vdpasim_set_vq_num,
 667         .kick_vq                = vdpasim_kick_vq,
 668         .set_vq_cb              = vdpasim_set_vq_cb,
 669         .set_vq_ready           = vdpasim_set_vq_ready,
 670         .get_vq_ready           = vdpasim_get_vq_ready,
 671         .set_vq_state           = vdpasim_set_vq_state,
 672         .get_vq_state           = vdpasim_get_vq_state,
 673         .get_vq_align           = vdpasim_get_vq_align,
 674         .get_features           = vdpasim_get_features,
 675         .set_features           = vdpasim_set_features,
 676         .set_config_cb          = vdpasim_set_config_cb,
 677         .get_vq_num_max         = vdpasim_get_vq_num_max,
 678         .get_device_id          = vdpasim_get_device_id,
 679         .get_vendor_id          = vdpasim_get_vendor_id,
 680         .get_status             = vdpasim_get_status,
 681         .set_status             = vdpasim_set_status,
 682         .get_config             = vdpasim_get_config,
 683         .set_config             = vdpasim_set_config,
 684         .get_generation         = vdpasim_get_generation,
 685         .get_iova_range         = vdpasim_get_iova_range,
 686         .dma_map                = vdpasim_dma_map,
 687         .dma_unmap              = vdpasim_dma_unmap,
 688         .free                   = vdpasim_free,
 689 };
 690
 691 static const struct vdpa_config_ops vdpasim_net_batch_config_ops = {
 692         .set_vq_address         = vdpasim_set_vq_address,
 693         .set_vq_num             = vdpasim_set_vq_num,
 694         .kick_vq                = vdpasim_kick_vq,
 695         .set_vq_cb              = vdpasim_set_vq_cb,
 696         .set_vq_ready           = vdpasim_set_vq_ready,
 697         .get_vq_ready           = vdpasim_get_vq_ready,
 698         .set_vq_state           = vdpasim_set_vq_state,
 699         .get_vq_state           = vdpasim_get_vq_state,
 700         .get_vq_align           = vdpasim_get_vq_align,
 701         .get_features           = vdpasim_get_features,
 702         .set_features           = vdpasim_set_features,
 703         .set_config_cb          = vdpasim_set_config_cb,
 704         .get_vq_num_max         = vdpasim_get_vq_num_max,
 705         .get_device_id          = vdpasim_get_device_id,
 706         .get_vendor_id          = vdpasim_get_vendor_id,
 707         .get_status             = vdpasim_get_status,
 708         .set_status             = vdpasim_set_status,
 709         .get_config             = vdpasim_get_config,
 710         .set_config             = vdpasim_set_config,
 711         .get_generation         = vdpasim_get_generation,
 712         .get_iova_range         = vdpasim_get_iova_range,
 713         .set_map                = vdpasim_set_map,
 714         .free                   = vdpasim_free,
 715 };
 716
 717 static int __init vdpasim_dev_init(void)
 718 {
 719         vdpasim_dev = vdpasim_create();
 720
 721         if (!IS_ERR(vdpasim_dev))
 722                 return 0;
 723
 724         return PTR_ERR(vdpasim_dev);
 725 }
 726
 727 static void __exit vdpasim_dev_exit(void)
 728 {
 729         struct vdpa_device *vdpa = &vdpasim_dev->vdpa;
 730
 731         vdpa_unregister_device(vdpa);
 732 }
 733
 734 module_init(vdpasim_dev_init)
 735 module_exit(vdpasim_dev_exit)
 736
 737 MODULE_VERSION(DRV_VERSION);
 738 MODULE_LICENSE(DRV_LICENSE);
 739 MODULE_AUTHOR(DRV_AUTHOR);
 740 MODULE_DESCRIPTION(DRV_DESC);