drivers/vfio/fsl-mc/vfio_fsl_mc.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /*
   3  * Copyright 2013-2016 Freescale Semiconductor Inc.
   4  * Copyright 2016-2017,2019-2020 NXP
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/iommu.h>
   9 #include <linux/module.h>
  10 #include <linux/mutex.h>
  11 #include <linux/slab.h>
  12 #include <linux/types.h>
  13 #include <linux/vfio.h>
  14 #include <linux/fsl/mc.h>
  15 #include <linux/delay.h>
  16 #include <linux/io-64-nonatomic-hi-lo.h>
  17
  18 #include "vfio_fsl_mc_private.h"
  19
  20 static struct fsl_mc_driver vfio_fsl_mc_driver;
  21
  22 static DEFINE_MUTEX(reflck_lock);
  23
  24 static void vfio_fsl_mc_reflck_get(struct vfio_fsl_mc_reflck *reflck)
  25 {
  26         kref_get(&reflck->kref);
  27 }
  28
  29 static void vfio_fsl_mc_reflck_release(struct kref *kref)
  30 {
  31         struct vfio_fsl_mc_reflck *reflck = container_of(kref,
  32                                                       struct vfio_fsl_mc_reflck,
  33                                                       kref);
  34
  35         mutex_destroy(&reflck->lock);
  36         kfree(reflck);
  37         mutex_unlock(&reflck_lock);
  38 }
  39
  40 static void vfio_fsl_mc_reflck_put(struct vfio_fsl_mc_reflck *reflck)
  41 {
  42         kref_put_mutex(&reflck->kref, vfio_fsl_mc_reflck_release, &reflck_lock);
  43 }
  44
  45 static struct vfio_fsl_mc_reflck *vfio_fsl_mc_reflck_alloc(void)
  46 {
  47         struct vfio_fsl_mc_reflck *reflck;
  48
  49         reflck = kzalloc(sizeof(*reflck), GFP_KERNEL);
  50         if (!reflck)
  51                 return ERR_PTR(-ENOMEM);
  52
  53         kref_init(&reflck->kref);
  54         mutex_init(&reflck->lock);
  55
  56         return reflck;
  57 }
  58
  59 static int vfio_fsl_mc_reflck_attach(struct vfio_fsl_mc_device *vdev)
  60 {
  61         int ret = 0;
  62
  63         mutex_lock(&reflck_lock);
  64         if (is_fsl_mc_bus_dprc(vdev->mc_dev)) {
  65                 vdev->reflck = vfio_fsl_mc_reflck_alloc();
  66                 ret = PTR_ERR_OR_ZERO(vdev->reflck);
  67         } else {
  68                 struct device *mc_cont_dev = vdev->mc_dev->dev.parent;
  69                 struct vfio_device *device;
  70                 struct vfio_fsl_mc_device *cont_vdev;
  71
  72                 device = vfio_device_get_from_dev(mc_cont_dev);
  73                 if (!device) {
  74                         ret = -ENODEV;
  75                         goto unlock;
  76                 }
  77
  78                 cont_vdev = vfio_device_data(device);
  79                 if (!cont_vdev || !cont_vdev->reflck) {
  80                         vfio_device_put(device);
  81                         ret = -ENODEV;
  82                         goto unlock;
  83                 }
  84                 vfio_fsl_mc_reflck_get(cont_vdev->reflck);
  85                 vdev->reflck = cont_vdev->reflck;
  86                 vfio_device_put(device);
  87         }
  88
  89 unlock:
  90         mutex_unlock(&reflck_lock);
  91         return ret;
  92 }
  93
  94 static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
  95 {
  96         struct fsl_mc_device *mc_dev = vdev->mc_dev;
  97         int count = mc_dev->obj_desc.region_count;
  98         int i;
  99
 100         vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region),
 101                                 GFP_KERNEL);
 102         if (!vdev->regions)
 103                 return -ENOMEM;
 104
 105         for (i = 0; i < count; i++) {
 106                 struct resource *res = &mc_dev->regions[i];
 107                 int no_mmap = is_fsl_mc_bus_dprc(mc_dev);
 108
 109                 vdev->regions[i].addr = res->start;
 110                 vdev->regions[i].size = resource_size(res);
 111                 vdev->regions[i].type = mc_dev->regions[i].flags & IORESOURCE_BITS;
 112                 /*
 113                  * Only regions addressed with PAGE granularity may be
 114                  * MMAPed securely.
 115                  */
 116                 if (!no_mmap && !(vdev->regions[i].addr & ~PAGE_MASK) &&
 117                                 !(vdev->regions[i].size & ~PAGE_MASK))
 118                         vdev->regions[i].flags |=
 119                                         VFIO_REGION_INFO_FLAG_MMAP;
 120                 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
 121                 if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY))
 122                         vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
 129 {
 130         struct fsl_mc_device *mc_dev = vdev->mc_dev;
 131         int i;
 132
 133         for (i = 0; i < mc_dev->obj_desc.region_count; i++)
 134                 iounmap(vdev->regions[i].ioaddr);
 135         kfree(vdev->regions);
 136 }
 137
 138 static int vfio_fsl_mc_open(void *device_data)
 139 {
 140         struct vfio_fsl_mc_device *vdev = device_data;
 141         int ret;
 142
 143         if (!try_module_get(THIS_MODULE))
 144                 return -ENODEV;
 145
 146         mutex_lock(&vdev->reflck->lock);
 147         if (!vdev->refcnt) {
 148                 ret = vfio_fsl_mc_regions_init(vdev);
 149                 if (ret)
 150                         goto err_reg_init;
 151         }
 152         vdev->refcnt++;
 153
 154         mutex_unlock(&vdev->reflck->lock);
 155
 156         return 0;
 157
 158 err_reg_init:
 159         mutex_unlock(&vdev->reflck->lock);
 160         module_put(THIS_MODULE);
 161         return ret;
 162 }
 163
 164 static void vfio_fsl_mc_release(void *device_data)
 165 {
 166         struct vfio_fsl_mc_device *vdev = device_data;
 167         int ret;
 168
 169         mutex_lock(&vdev->reflck->lock);
 170
 171         if (!(--vdev->refcnt)) {
 172                 struct fsl_mc_device *mc_dev = vdev->mc_dev;
 173                 struct device *cont_dev = fsl_mc_cont_dev(&mc_dev->dev);
 174                 struct fsl_mc_device *mc_cont = to_fsl_mc_device(cont_dev);
 175
 176                 vfio_fsl_mc_regions_cleanup(vdev);
 177
 178                 /* reset the device before cleaning up the interrupts */
 179                 ret = dprc_reset_container(mc_cont->mc_io, 0,
 180                       mc_cont->mc_handle,
 181                           mc_cont->obj_desc.id,
 182                           DPRC_RESET_OPTION_NON_RECURSIVE);
 183
 184                 if (ret) {
 185                         dev_warn(&mc_cont->dev, "VFIO_FLS_MC: reset device has failed (%d)\n",
 186                                  ret);
 187                         WARN_ON(1);
 188                 }
 189
 190                 vfio_fsl_mc_irqs_cleanup(vdev);
 191
 192                 fsl_mc_cleanup_irq_pool(mc_cont);
 193         }
 194
 195         mutex_unlock(&vdev->reflck->lock);
 196
 197         module_put(THIS_MODULE);
 198 }
 199
 200 static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
 201                               unsigned long arg)
 202 {
 203         unsigned long minsz;
 204         struct vfio_fsl_mc_device *vdev = device_data;
 205         struct fsl_mc_device *mc_dev = vdev->mc_dev;
 206
 207         switch (cmd) {
 208         case VFIO_DEVICE_GET_INFO:
 209         {
 210                 struct vfio_device_info info;
 211
 212                 minsz = offsetofend(struct vfio_device_info, num_irqs);
 213
 214                 if (copy_from_user(&info, (void __user *)arg, minsz))
 215                         return -EFAULT;
 216
 217                 if (info.argsz < minsz)
 218                         return -EINVAL;
 219
 220                 info.flags = VFIO_DEVICE_FLAGS_FSL_MC;
 221
 222                 if (is_fsl_mc_bus_dprc(mc_dev))
 223                         info.flags |= VFIO_DEVICE_FLAGS_RESET;
 224
 225                 info.num_regions = mc_dev->obj_desc.region_count;
 226                 info.num_irqs = mc_dev->obj_desc.irq_count;
 227
 228                 return copy_to_user((void __user *)arg, &info, minsz) ?
 229                         -EFAULT : 0;
 230         }
 231         case VFIO_DEVICE_GET_REGION_INFO:
 232         {
 233                 struct vfio_region_info info;
 234
 235                 minsz = offsetofend(struct vfio_region_info, offset);
 236
 237                 if (copy_from_user(&info, (void __user *)arg, minsz))
 238                         return -EFAULT;
 239
 240                 if (info.argsz < minsz)
 241                         return -EINVAL;
 242
 243                 if (info.index >= mc_dev->obj_desc.region_count)
 244                         return -EINVAL;
 245
 246                 /* map offset to the physical address  */
 247                 info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index);
 248                 info.size = vdev->regions[info.index].size;
 249                 info.flags = vdev->regions[info.index].flags;
 250
 251                 if (copy_to_user((void __user *)arg, &info, minsz))
 252                         return -EFAULT;
 253                 return 0;
 254         }
 255         case VFIO_DEVICE_GET_IRQ_INFO:
 256         {
 257                 struct vfio_irq_info info;
 258
 259                 minsz = offsetofend(struct vfio_irq_info, count);
 260                 if (copy_from_user(&info, (void __user *)arg, minsz))
 261                         return -EFAULT;
 262
 263                 if (info.argsz < minsz)
 264                         return -EINVAL;
 265
 266                 if (info.index >= mc_dev->obj_desc.irq_count)
 267                         return -EINVAL;
 268
 269                 info.flags = VFIO_IRQ_INFO_EVENTFD;
 270                 info.count = 1;
 271
 272                 if (copy_to_user((void __user *)arg, &info, minsz))
 273                         return -EFAULT;
 274                 return 0;
 275         }
 276         case VFIO_DEVICE_SET_IRQS:
 277         {
 278                 struct vfio_irq_set hdr;
 279                 u8 *data = NULL;
 280                 int ret = 0;
 281                 size_t data_size = 0;
 282
 283                 minsz = offsetofend(struct vfio_irq_set, count);
 284
 285                 if (copy_from_user(&hdr, (void __user *)arg, minsz))
 286                         return -EFAULT;
 287
 288                 ret = vfio_set_irqs_validate_and_prepare(&hdr, mc_dev->obj_desc.irq_count,
 289                                         mc_dev->obj_desc.irq_count, &data_size);
 290                 if (ret)
 291                         return ret;
 292
 293                 if (data_size) {
 294                         data = memdup_user((void __user *)(arg + minsz),
 295                                    data_size);
 296                         if (IS_ERR(data))
 297                                 return PTR_ERR(data);
 298                 }
 299
 300                 mutex_lock(&vdev->igate);
 301                 ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
 302                                                  hdr.index, hdr.start,
 303                                                  hdr.count, data);
 304                 mutex_unlock(&vdev->igate);
 305                 kfree(data);
 306
 307                 return ret;
 308         }
 309         case VFIO_DEVICE_RESET:
 310         {
 311                 int ret;
 312                 struct fsl_mc_device *mc_dev = vdev->mc_dev;
 313
 314                 /* reset is supported only for the DPRC */
 315                 if (!is_fsl_mc_bus_dprc(mc_dev))
 316                         return -ENOTTY;
 317
 318                 ret = dprc_reset_container(mc_dev->mc_io, 0,
 319                                            mc_dev->mc_handle,
 320                                            mc_dev->obj_desc.id,
 321                                            DPRC_RESET_OPTION_NON_RECURSIVE);
 322                 return ret;
 323
 324         }
 325         default:
 326                 return -ENOTTY;
 327         }
 328 }
 329
 330 static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf,
 331                                 size_t count, loff_t *ppos)
 332 {
 333         struct vfio_fsl_mc_device *vdev = device_data;
 334         unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos);
 335         loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK;
 336         struct fsl_mc_device *mc_dev = vdev->mc_dev;
 337         struct vfio_fsl_mc_region *region;
 338         u64 data[8];
 339         int i;
 340
 341         if (index >= mc_dev->obj_desc.region_count)
 342                 return -EINVAL;
 343
 344         region = &vdev->regions[index];
 345
 346         if (!(region->flags & VFIO_REGION_INFO_FLAG_READ))
 347                 return -EINVAL;
 348
 349         if (!region->ioaddr) {
 350                 region->ioaddr = ioremap(region->addr, region->size);
 351                 if (!region->ioaddr)
 352                         return -ENOMEM;
 353         }
 354
 355         if (count != 64 || off != 0)
 356                 return -EINVAL;
 357
 358         for (i = 7; i >= 0; i--)
 359                 data[i] = readq(region->ioaddr + i * sizeof(uint64_t));
 360
 361         if (copy_to_user(buf, data, 64))
 362                 return -EFAULT;
 363
 364         return count;
 365 }
 366
 367 #define MC_CMD_COMPLETION_TIMEOUT_MS    5000
 368 #define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS    500
 369
 370 static int vfio_fsl_mc_send_command(void __iomem *ioaddr, uint64_t *cmd_data)
 371 {
 372         int i;
 373         enum mc_cmd_status status;
 374         unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000;
 375
 376         /* Write at command parameter into portal */
 377         for (i = 7; i >= 1; i--)
 378                 writeq_relaxed(cmd_data[i], ioaddr + i * sizeof(uint64_t));
 379
 380         /* Write command header in the end */
 381         writeq(cmd_data[0], ioaddr);
 382
 383         /* Wait for response before returning to user-space
 384          * This can be optimized in future to even prepare response
 385          * before returning to user-space and avoid read ioctl.
 386          */
 387         for (;;) {
 388                 u64 header;
 389                 struct mc_cmd_header *resp_hdr;
 390
 391                 header = cpu_to_le64(readq_relaxed(ioaddr));
 392
 393                 resp_hdr = (struct mc_cmd_header *)&header;
 394                 status = (enum mc_cmd_status)resp_hdr->status;
 395                 if (status != MC_CMD_STATUS_READY)
 396                         break;
 397
 398                 udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
 399                 timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS;
 400                 if (timeout_usecs == 0)
 401                         return -ETIMEDOUT;
 402         }
 403
 404         return 0;
 405 }
 406
 407 static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf,
 408                                  size_t count, loff_t *ppos)
 409 {
 410         struct vfio_fsl_mc_device *vdev = device_data;
 411         unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos);
 412         loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK;
 413         struct fsl_mc_device *mc_dev = vdev->mc_dev;
 414         struct vfio_fsl_mc_region *region;
 415         u64 data[8];
 416         int ret;
 417
 418         if (index >= mc_dev->obj_desc.region_count)
 419                 return -EINVAL;
 420
 421         region = &vdev->regions[index];
 422
 423         if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE))
 424                 return -EINVAL;
 425
 426         if (!region->ioaddr) {
 427                 region->ioaddr = ioremap(region->addr, region->size);
 428                 if (!region->ioaddr)
 429                         return -ENOMEM;
 430         }
 431
 432         if (count != 64 || off != 0)
 433                 return -EINVAL;
 434
 435         if (copy_from_user(&data, buf, 64))
 436                 return -EFAULT;
 437
 438         ret = vfio_fsl_mc_send_command(region->ioaddr, data);
 439         if (ret)
 440                 return ret;
 441
 442         return count;
 443
 444 }
 445
 446 static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region,
 447                                  struct vm_area_struct *vma)
 448 {
 449         u64 size = vma->vm_end - vma->vm_start;
 450         u64 pgoff, base;
 451         u8 region_cacheable;
 452
 453         pgoff = vma->vm_pgoff &
 454                 ((1U << (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
 455         base = pgoff << PAGE_SHIFT;
 456
 457         if (region.size < PAGE_SIZE || base + size > region.size)
 458                 return -EINVAL;
 459
 460         region_cacheable = (region.type & FSL_MC_REGION_CACHEABLE) &&
 461                            (region.type & FSL_MC_REGION_SHAREABLE);
 462         if (!region_cacheable)
 463                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 464
 465         vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
 466
 467         return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 468                                size, vma->vm_page_prot);
 469 }
 470
 471 static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma)
 472 {
 473         struct vfio_fsl_mc_device *vdev = device_data;
 474         struct fsl_mc_device *mc_dev = vdev->mc_dev;
 475         unsigned int index;
 476
 477         index = vma->vm_pgoff >> (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT);
 478
 479         if (vma->vm_end < vma->vm_start)
 480                 return -EINVAL;
 481         if (vma->vm_start & ~PAGE_MASK)
 482                 return -EINVAL;
 483         if (vma->vm_end & ~PAGE_MASK)
 484                 return -EINVAL;
 485         if (!(vma->vm_flags & VM_SHARED))
 486                 return -EINVAL;
 487         if (index >= mc_dev->obj_desc.region_count)
 488                 return -EINVAL;
 489
 490         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
 491                 return -EINVAL;
 492
 493         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
 494                         && (vma->vm_flags & VM_READ))
 495                 return -EINVAL;
 496
 497         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
 498                         && (vma->vm_flags & VM_WRITE))
 499                 return -EINVAL;
 500
 501         vma->vm_private_data = mc_dev;
 502
 503         return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma);
 504 }
 505
 506 static const struct vfio_device_ops vfio_fsl_mc_ops = {
 507         .name           = "vfio-fsl-mc",
 508         .open           = vfio_fsl_mc_open,
 509         .release        = vfio_fsl_mc_release,
 510         .ioctl          = vfio_fsl_mc_ioctl,
 511         .read           = vfio_fsl_mc_read,
 512         .write          = vfio_fsl_mc_write,
 513         .mmap           = vfio_fsl_mc_mmap,
 514 };
 515
 516 static int vfio_fsl_mc_bus_notifier(struct notifier_block *nb,
 517                                     unsigned long action, void *data)
 518 {
 519         struct vfio_fsl_mc_device *vdev = container_of(nb,
 520                                         struct vfio_fsl_mc_device, nb);
 521         struct device *dev = data;
 522         struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
 523         struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
 524
 525         if (action == BUS_NOTIFY_ADD_DEVICE &&
 526             vdev->mc_dev == mc_cont) {
 527                 mc_dev->driver_override = kasprintf(GFP_KERNEL, "%s",
 528                                                     vfio_fsl_mc_ops.name);
 529                 if (!mc_dev->driver_override)
 530                         dev_warn(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s failed\n",
 531                                  dev_name(&mc_cont->dev));
 532                 else
 533                         dev_info(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s\n",
 534                                  dev_name(&mc_cont->dev));
 535         } else if (action == BUS_NOTIFY_BOUND_DRIVER &&
 536                 vdev->mc_dev == mc_cont) {
 537                 struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
 538
 539                 if (mc_drv && mc_drv != &vfio_fsl_mc_driver)
 540                         dev_warn(dev, "VFIO_FSL_MC: Object %s bound to driver %s while DPRC bound to vfio-fsl-mc\n",
 541                                  dev_name(dev), mc_drv->driver.name);
 542         }
 543
 544         return 0;
 545 }
 546
 547 static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev)
 548 {
 549         struct fsl_mc_device *mc_dev = vdev->mc_dev;
 550         int ret;
 551
 552         /* Non-dprc devices share mc_io from parent */
 553         if (!is_fsl_mc_bus_dprc(mc_dev)) {
 554                 struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
 555
 556                 mc_dev->mc_io = mc_cont->mc_io;
 557                 return 0;
 558         }
 559
 560         vdev->nb.notifier_call = vfio_fsl_mc_bus_notifier;
 561         ret = bus_register_notifier(&fsl_mc_bus_type, &vdev->nb);
 562         if (ret)
 563                 return ret;
 564
 565         /* open DPRC, allocate a MC portal */
 566         ret = dprc_setup(mc_dev);
 567         if (ret) {
 568                 dev_err(&mc_dev->dev, "VFIO_FSL_MC: Failed to setup DPRC (%d)\n", ret);
 569                 goto out_nc_unreg;
 570         }
 571
 572         ret = dprc_scan_container(mc_dev, false);
 573         if (ret) {
 574                 dev_err(&mc_dev->dev, "VFIO_FSL_MC: Container scanning failed (%d)\n", ret);
 575                 goto out_dprc_cleanup;
 576         }
 577
 578         return 0;
 579
 580 out_dprc_cleanup:
 581         dprc_remove_devices(mc_dev, NULL, 0);
 582         dprc_cleanup(mc_dev);
 583 out_nc_unreg:
 584         bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
 585         vdev->nb.notifier_call = NULL;
 586
 587         return ret;
 588 }
 589
 590 static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
 591 {
 592         struct iommu_group *group;
 593         struct vfio_fsl_mc_device *vdev;
 594         struct device *dev = &mc_dev->dev;
 595         int ret;
 596
 597         group = vfio_iommu_group_get(dev);
 598         if (!group) {
 599                 dev_err(dev, "VFIO_FSL_MC: No IOMMU group\n");
 600                 return -EINVAL;
 601         }
 602
 603         vdev = devm_kzalloc(dev, sizeof(*vdev), GFP_KERNEL);
 604         if (!vdev) {
 605                 ret = -ENOMEM;
 606                 goto out_group_put;
 607         }
 608
 609         vdev->mc_dev = mc_dev;
 610
 611         ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev);
 612         if (ret) {
 613                 dev_err(dev, "VFIO_FSL_MC: Failed to add to vfio group\n");
 614                 goto out_group_put;
 615         }
 616
 617         ret = vfio_fsl_mc_reflck_attach(vdev);
 618         if (ret)
 619                 goto out_group_dev;
 620
 621         ret = vfio_fsl_mc_init_device(vdev);
 622         if (ret)
 623                 goto out_reflck;
 624
 625         mutex_init(&vdev->igate);
 626
 627         return 0;
 628
 629 out_reflck:
 630         vfio_fsl_mc_reflck_put(vdev->reflck);
 631 out_group_dev:
 632         vfio_del_group_dev(dev);
 633 out_group_put:
 634         vfio_iommu_group_put(group, dev);
 635         return ret;
 636 }
 637
 638 static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
 639 {
 640         struct vfio_fsl_mc_device *vdev;
 641         struct device *dev = &mc_dev->dev;
 642
 643         vdev = vfio_del_group_dev(dev);
 644         if (!vdev)
 645                 return -EINVAL;
 646
 647         mutex_destroy(&vdev->igate);
 648
 649         vfio_fsl_mc_reflck_put(vdev->reflck);
 650
 651         if (is_fsl_mc_bus_dprc(mc_dev)) {
 652                 dprc_remove_devices(mc_dev, NULL, 0);
 653                 dprc_cleanup(mc_dev);
 654         }
 655
 656         if (vdev->nb.notifier_call)
 657                 bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
 658
 659         vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
 660
 661         return 0;
 662 }
 663
 664 static struct fsl_mc_driver vfio_fsl_mc_driver = {
 665         .probe          = vfio_fsl_mc_probe,
 666         .remove         = vfio_fsl_mc_remove,
 667         .driver = {
 668                 .name   = "vfio-fsl-mc",
 669                 .owner  = THIS_MODULE,
 670         },
 671 };
 672
 673 static int __init vfio_fsl_mc_driver_init(void)
 674 {
 675         return fsl_mc_driver_register(&vfio_fsl_mc_driver);
 676 }
 677
 678 static void __exit vfio_fsl_mc_driver_exit(void)
 679 {
 680         fsl_mc_driver_unregister(&vfio_fsl_mc_driver);
 681 }
 682
 683 module_init(vfio_fsl_mc_driver_init);
 684 module_exit(vfio_fsl_mc_driver_exit);
 685
 686 MODULE_LICENSE("Dual BSD/GPL");
 687 MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver");