drivers/vfio/platform/vfio_platform_common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 - Virtual Open Systems
   4  * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
   5  */
   6
   7 #define dev_fmt(fmt)    "VFIO: " fmt
   8
   9 #include <linux/device.h>
  10 #include <linux/acpi.h>
  11 #include <linux/iommu.h>
  12 #include <linux/module.h>
  13 #include <linux/mutex.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/slab.h>
  16 #include <linux/types.h>
  17 #include <linux/uaccess.h>
  18 #include <linux/vfio.h>
  19
  20 #include "vfio_platform_private.h"
  21
  22 #define DRIVER_VERSION  "0.10"
  23 #define DRIVER_AUTHOR   "Antonios Motakis <a.motakis@virtualopensystems.com>"
  24 #define DRIVER_DESC     "VFIO platform base module"
  25
  26 #define VFIO_PLATFORM_IS_ACPI(vdev) ((vdev)->acpihid != NULL)
  27
  28 static LIST_HEAD(reset_list);
  29 static DEFINE_MUTEX(driver_lock);
  30
  31 static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat,
  32                                         struct module **module)
  33 {
  34         struct vfio_platform_reset_node *iter;
  35         vfio_platform_reset_fn_t reset_fn = NULL;
  36
  37         mutex_lock(&driver_lock);
  38         list_for_each_entry(iter, &reset_list, link) {
  39                 if (!strcmp(iter->compat, compat) &&
  40                         try_module_get(iter->owner)) {
  41                         *module = iter->owner;
  42                         reset_fn = iter->of_reset;
  43                         break;
  44                 }
  45         }
  46         mutex_unlock(&driver_lock);
  47         return reset_fn;
  48 }
  49
  50 static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
  51                                     struct device *dev)
  52 {
  53         struct acpi_device *adev;
  54
  55         if (acpi_disabled)
  56                 return -ENOENT;
  57
  58         adev = ACPI_COMPANION(dev);
  59         if (!adev) {
  60                 dev_err(dev, "ACPI companion device not found for %s\n",
  61                         vdev->name);
  62                 return -ENODEV;
  63         }
  64
  65 #ifdef CONFIG_ACPI
  66         vdev->acpihid = acpi_device_hid(adev);
  67 #endif
  68         return WARN_ON(!vdev->acpihid) ? -EINVAL : 0;
  69 }
  70
  71 static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev,
  72                                   const char **extra_dbg)
  73 {
  74 #ifdef CONFIG_ACPI
  75         struct device *dev = vdev->device;
  76         acpi_handle handle = ACPI_HANDLE(dev);
  77         acpi_status acpi_ret;
  78
  79         acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, NULL);
  80         if (ACPI_FAILURE(acpi_ret)) {
  81                 if (extra_dbg)
  82                         *extra_dbg = acpi_format_exception(acpi_ret);
  83                 return -EINVAL;
  84         }
  85
  86         return 0;
  87 #else
  88         return -ENOENT;
  89 #endif
  90 }
  91
  92 static bool vfio_platform_acpi_has_reset(struct vfio_platform_device *vdev)
  93 {
  94 #ifdef CONFIG_ACPI
  95         struct device *dev = vdev->device;
  96         acpi_handle handle = ACPI_HANDLE(dev);
  97
  98         return acpi_has_method(handle, "_RST");
  99 #else
 100         return false;
 101 #endif
 102 }
 103
 104 static bool vfio_platform_has_reset(struct vfio_platform_device *vdev)
 105 {
 106         if (VFIO_PLATFORM_IS_ACPI(vdev))
 107                 return vfio_platform_acpi_has_reset(vdev);
 108
 109         return vdev->of_reset ? true : false;
 110 }
 111
 112 static int vfio_platform_get_reset(struct vfio_platform_device *vdev)
 113 {
 114         if (VFIO_PLATFORM_IS_ACPI(vdev))
 115                 return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT;
 116
 117         vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
 118                                                     &vdev->reset_module);
 119         if (!vdev->of_reset) {
 120                 request_module("vfio-reset:%s", vdev->compat);
 121                 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
 122                                                         &vdev->reset_module);
 123         }
 124
 125         return vdev->of_reset ? 0 : -ENOENT;
 126 }
 127
 128 static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
 129 {
 130         if (VFIO_PLATFORM_IS_ACPI(vdev))
 131                 return;
 132
 133         if (vdev->of_reset)
 134                 module_put(vdev->reset_module);
 135 }
 136
 137 static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
 138 {
 139         int cnt = 0, i;
 140
 141         while (vdev->get_resource(vdev, cnt))
 142                 cnt++;
 143
 144         vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region),
 145                                 GFP_KERNEL);
 146         if (!vdev->regions)
 147                 return -ENOMEM;
 148
 149         for (i = 0; i < cnt;  i++) {
 150                 struct resource *res =
 151                         vdev->get_resource(vdev, i);
 152
 153                 if (!res)
 154                         goto err;
 155
 156                 vdev->regions[i].addr = res->start;
 157                 vdev->regions[i].size = resource_size(res);
 158                 vdev->regions[i].flags = 0;
 159
 160                 switch (resource_type(res)) {
 161                 case IORESOURCE_MEM:
 162                         vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
 163                         vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
 164                         if (!(res->flags & IORESOURCE_READONLY))
 165                                 vdev->regions[i].flags |=
 166                                         VFIO_REGION_INFO_FLAG_WRITE;
 167
 168                         /*
 169                          * Only regions addressed with PAGE granularity may be
 170                          * MMAPed securely.
 171                          */
 172                         if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
 173                                         !(vdev->regions[i].size & ~PAGE_MASK))
 174                                 vdev->regions[i].flags |=
 175                                         VFIO_REGION_INFO_FLAG_MMAP;
 176
 177                         break;
 178                 case IORESOURCE_IO:
 179                         vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
 180                         break;
 181                 default:
 182                         goto err;
 183                 }
 184         }
 185
 186         vdev->num_regions = cnt;
 187
 188         return 0;
 189 err:
 190         kfree(vdev->regions);
 191         return -EINVAL;
 192 }
 193
 194 static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
 195 {
 196         int i;
 197
 198         for (i = 0; i < vdev->num_regions; i++)
 199                 iounmap(vdev->regions[i].ioaddr);
 200
 201         vdev->num_regions = 0;
 202         kfree(vdev->regions);
 203 }
 204
 205 static int vfio_platform_call_reset(struct vfio_platform_device *vdev,
 206                                     const char **extra_dbg)
 207 {
 208         if (VFIO_PLATFORM_IS_ACPI(vdev)) {
 209                 dev_info(vdev->device, "reset\n");
 210                 return vfio_platform_acpi_call_reset(vdev, extra_dbg);
 211         } else if (vdev->of_reset) {
 212                 dev_info(vdev->device, "reset\n");
 213                 return vdev->of_reset(vdev);
 214         }
 215
 216         dev_warn(vdev->device, "no reset function found!\n");
 217         return -EINVAL;
 218 }
 219
 220 static void vfio_platform_release(void *device_data)
 221 {
 222         struct vfio_platform_device *vdev = device_data;
 223
 224         mutex_lock(&driver_lock);
 225
 226         if (!(--vdev->refcnt)) {
 227                 const char *extra_dbg = NULL;
 228                 int ret;
 229
 230                 ret = vfio_platform_call_reset(vdev, &extra_dbg);
 231                 if (ret && vdev->reset_required) {
 232                         dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n",
 233                                  ret, extra_dbg ? extra_dbg : "");
 234                         WARN_ON(1);
 235                 }
 236                 pm_runtime_put(vdev->device);
 237                 vfio_platform_regions_cleanup(vdev);
 238                 vfio_platform_irq_cleanup(vdev);
 239         }
 240
 241         mutex_unlock(&driver_lock);
 242
 243         module_put(vdev->parent_module);
 244 }
 245
 246 static int vfio_platform_open(void *device_data)
 247 {
 248         struct vfio_platform_device *vdev = device_data;
 249         int ret;
 250
 251         if (!try_module_get(vdev->parent_module))
 252                 return -ENODEV;
 253
 254         mutex_lock(&driver_lock);
 255
 256         if (!vdev->refcnt) {
 257                 const char *extra_dbg = NULL;
 258
 259                 ret = vfio_platform_regions_init(vdev);
 260                 if (ret)
 261                         goto err_reg;
 262
 263                 ret = vfio_platform_irq_init(vdev);
 264                 if (ret)
 265                         goto err_irq;
 266
 267                 ret = pm_runtime_get_sync(vdev->device);
 268                 if (ret < 0)
 269                         goto err_rst;
 270
 271                 ret = vfio_platform_call_reset(vdev, &extra_dbg);
 272                 if (ret && vdev->reset_required) {
 273                         dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n",
 274                                  ret, extra_dbg ? extra_dbg : "");
 275                         goto err_rst;
 276                 }
 277         }
 278
 279         vdev->refcnt++;
 280
 281         mutex_unlock(&driver_lock);
 282         return 0;
 283
 284 err_rst:
 285         pm_runtime_put(vdev->device);
 286         vfio_platform_irq_cleanup(vdev);
 287 err_irq:
 288         vfio_platform_regions_cleanup(vdev);
 289 err_reg:
 290         mutex_unlock(&driver_lock);
 291         module_put(vdev->parent_module);
 292         return ret;
 293 }
 294
 295 static long vfio_platform_ioctl(void *device_data,
 296                                 unsigned int cmd, unsigned long arg)
 297 {
 298         struct vfio_platform_device *vdev = device_data;
 299         unsigned long minsz;
 300
 301         if (cmd == VFIO_DEVICE_GET_INFO) {
 302                 struct vfio_device_info info;
 303
 304                 minsz = offsetofend(struct vfio_device_info, num_irqs);
 305
 306                 if (copy_from_user(&info, (void __user *)arg, minsz))
 307                         return -EFAULT;
 308
 309                 if (info.argsz < minsz)
 310                         return -EINVAL;
 311
 312                 if (vfio_platform_has_reset(vdev))
 313                         vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
 314                 info.flags = vdev->flags;
 315                 info.num_regions = vdev->num_regions;
 316                 info.num_irqs = vdev->num_irqs;
 317
 318                 return copy_to_user((void __user *)arg, &info, minsz) ?
 319                         -EFAULT : 0;
 320
 321         } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
 322                 struct vfio_region_info info;
 323
 324                 minsz = offsetofend(struct vfio_region_info, offset);
 325
 326                 if (copy_from_user(&info, (void __user *)arg, minsz))
 327                         return -EFAULT;
 328
 329                 if (info.argsz < minsz)
 330                         return -EINVAL;
 331
 332                 if (info.index >= vdev->num_regions)
 333                         return -EINVAL;
 334
 335                 /* map offset to the physical address  */
 336                 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
 337                 info.size = vdev->regions[info.index].size;
 338                 info.flags = vdev->regions[info.index].flags;
 339
 340                 return copy_to_user((void __user *)arg, &info, minsz) ?
 341                         -EFAULT : 0;
 342
 343         } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
 344                 struct vfio_irq_info info;
 345
 346                 minsz = offsetofend(struct vfio_irq_info, count);
 347
 348                 if (copy_from_user(&info, (void __user *)arg, minsz))
 349                         return -EFAULT;
 350
 351                 if (info.argsz < minsz)
 352                         return -EINVAL;
 353
 354                 if (info.index >= vdev->num_irqs)
 355                         return -EINVAL;
 356
 357                 info.flags = vdev->irqs[info.index].flags;
 358                 info.count = vdev->irqs[info.index].count;
 359
 360                 return copy_to_user((void __user *)arg, &info, minsz) ?
 361                         -EFAULT : 0;
 362
 363         } else if (cmd == VFIO_DEVICE_SET_IRQS) {
 364                 struct vfio_irq_set hdr;
 365                 u8 *data = NULL;
 366                 int ret = 0;
 367                 size_t data_size = 0;
 368
 369                 minsz = offsetofend(struct vfio_irq_set, count);
 370
 371                 if (copy_from_user(&hdr, (void __user *)arg, minsz))
 372                         return -EFAULT;
 373
 374                 ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs,
 375                                                  vdev->num_irqs, &data_size);
 376                 if (ret)
 377                         return ret;
 378
 379                 if (data_size) {
 380                         data = memdup_user((void __user *)(arg + minsz),
 381                                             data_size);
 382                         if (IS_ERR(data))
 383                                 return PTR_ERR(data);
 384                 }
 385
 386                 mutex_lock(&vdev->igate);
 387
 388                 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
 389                                                    hdr.start, hdr.count, data);
 390                 mutex_unlock(&vdev->igate);
 391                 kfree(data);
 392
 393                 return ret;
 394
 395         } else if (cmd == VFIO_DEVICE_RESET) {
 396                 return vfio_platform_call_reset(vdev, NULL);
 397         }
 398
 399         return -ENOTTY;
 400 }
 401
 402 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
 403                                        char __user *buf, size_t count,
 404                                        loff_t off)
 405 {
 406         unsigned int done = 0;
 407
 408         if (!reg->ioaddr) {
 409                 reg->ioaddr =
 410                         ioremap(reg->addr, reg->size);
 411
 412                 if (!reg->ioaddr)
 413                         return -ENOMEM;
 414         }
 415
 416         while (count) {
 417                 size_t filled;
 418
 419                 if (count >= 4 && !(off % 4)) {
 420                         u32 val;
 421
 422                         val = ioread32(reg->ioaddr + off);
 423                         if (copy_to_user(buf, &val, 4))
 424                                 goto err;
 425
 426                         filled = 4;
 427                 } else if (count >= 2 && !(off % 2)) {
 428                         u16 val;
 429
 430                         val = ioread16(reg->ioaddr + off);
 431                         if (copy_to_user(buf, &val, 2))
 432                                 goto err;
 433
 434                         filled = 2;
 435                 } else {
 436                         u8 val;
 437
 438                         val = ioread8(reg->ioaddr + off);
 439                         if (copy_to_user(buf, &val, 1))
 440                                 goto err;
 441
 442                         filled = 1;
 443                 }
 444
 445
 446                 count -= filled;
 447                 done += filled;
 448                 off += filled;
 449                 buf += filled;
 450         }
 451
 452         return done;
 453 err:
 454         return -EFAULT;
 455 }
 456
 457 static ssize_t vfio_platform_read(void *device_data, char __user *buf,
 458                                   size_t count, loff_t *ppos)
 459 {
 460         struct vfio_platform_device *vdev = device_data;
 461         unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
 462         loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
 463
 464         if (index >= vdev->num_regions)
 465                 return -EINVAL;
 466
 467         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
 468                 return -EINVAL;
 469
 470         if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
 471                 return vfio_platform_read_mmio(&vdev->regions[index],
 472                                                         buf, count, off);
 473         else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
 474                 return -EINVAL; /* not implemented */
 475
 476         return -EINVAL;
 477 }
 478
 479 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
 480                                         const char __user *buf, size_t count,
 481                                         loff_t off)
 482 {
 483         unsigned int done = 0;
 484
 485         if (!reg->ioaddr) {
 486                 reg->ioaddr =
 487                         ioremap(reg->addr, reg->size);
 488
 489                 if (!reg->ioaddr)
 490                         return -ENOMEM;
 491         }
 492
 493         while (count) {
 494                 size_t filled;
 495
 496                 if (count >= 4 && !(off % 4)) {
 497                         u32 val;
 498
 499                         if (copy_from_user(&val, buf, 4))
 500                                 goto err;
 501                         iowrite32(val, reg->ioaddr + off);
 502
 503                         filled = 4;
 504                 } else if (count >= 2 && !(off % 2)) {
 505                         u16 val;
 506
 507                         if (copy_from_user(&val, buf, 2))
 508                                 goto err;
 509                         iowrite16(val, reg->ioaddr + off);
 510
 511                         filled = 2;
 512                 } else {
 513                         u8 val;
 514
 515                         if (copy_from_user(&val, buf, 1))
 516                                 goto err;
 517                         iowrite8(val, reg->ioaddr + off);
 518
 519                         filled = 1;
 520                 }
 521
 522                 count -= filled;
 523                 done += filled;
 524                 off += filled;
 525                 buf += filled;
 526         }
 527
 528         return done;
 529 err:
 530         return -EFAULT;
 531 }
 532
 533 static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
 534                                    size_t count, loff_t *ppos)
 535 {
 536         struct vfio_platform_device *vdev = device_data;
 537         unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
 538         loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
 539
 540         if (index >= vdev->num_regions)
 541                 return -EINVAL;
 542
 543         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
 544                 return -EINVAL;
 545
 546         if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
 547                 return vfio_platform_write_mmio(&vdev->regions[index],
 548                                                         buf, count, off);
 549         else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
 550                 return -EINVAL; /* not implemented */
 551
 552         return -EINVAL;
 553 }
 554
 555 static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
 556                                    struct vm_area_struct *vma)
 557 {
 558         u64 req_len, pgoff, req_start;
 559
 560         req_len = vma->vm_end - vma->vm_start;
 561         pgoff = vma->vm_pgoff &
 562                 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
 563         req_start = pgoff << PAGE_SHIFT;
 564
 565         if (region.size < PAGE_SIZE || req_start + req_len > region.size)
 566                 return -EINVAL;
 567
 568         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 569         vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
 570
 571         return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 572                                req_len, vma->vm_page_prot);
 573 }
 574
 575 static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
 576 {
 577         struct vfio_platform_device *vdev = device_data;
 578         unsigned int index;
 579
 580         index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
 581
 582         if (vma->vm_end < vma->vm_start)
 583                 return -EINVAL;
 584         if (!(vma->vm_flags & VM_SHARED))
 585                 return -EINVAL;
 586         if (index >= vdev->num_regions)
 587                 return -EINVAL;
 588         if (vma->vm_start & ~PAGE_MASK)
 589                 return -EINVAL;
 590         if (vma->vm_end & ~PAGE_MASK)
 591                 return -EINVAL;
 592
 593         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
 594                 return -EINVAL;
 595
 596         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
 597                         && (vma->vm_flags & VM_READ))
 598                 return -EINVAL;
 599
 600         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
 601                         && (vma->vm_flags & VM_WRITE))
 602                 return -EINVAL;
 603
 604         vma->vm_private_data = vdev;
 605
 606         if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
 607                 return vfio_platform_mmap_mmio(vdev->regions[index], vma);
 608
 609         else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
 610                 return -EINVAL; /* not implemented */
 611
 612         return -EINVAL;
 613 }
 614
 615 static const struct vfio_device_ops vfio_platform_ops = {
 616         .name           = "vfio-platform",
 617         .open           = vfio_platform_open,
 618         .release        = vfio_platform_release,
 619         .ioctl          = vfio_platform_ioctl,
 620         .read           = vfio_platform_read,
 621         .write          = vfio_platform_write,
 622         .mmap           = vfio_platform_mmap,
 623 };
 624
 625 static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
 626                            struct device *dev)
 627 {
 628         int ret;
 629
 630         ret = device_property_read_string(dev, "compatible",
 631                                           &vdev->compat);
 632         if (ret)
 633                 dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name);
 634
 635         return ret;
 636 }
 637
 638 /*
 639  * There can be two kernel build combinations. One build where
 640  * ACPI is not selected in Kconfig and another one with the ACPI Kconfig.
 641  *
 642  * In the first case, vfio_platform_acpi_probe will return since
 643  * acpi_disabled is 1. DT user will not see any kind of messages from
 644  * ACPI.
 645  *
 646  * In the second case, both DT and ACPI is compiled in but the system is
 647  * booting with any of these combinations.
 648  *
 649  * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine
 650  * terminates immediately without any messages.
 651  *
 652  * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
 653  * valid checks. We cannot claim that this system is DT.
 654  */
 655 int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 656                                struct device *dev)
 657 {
 658         struct iommu_group *group;
 659         int ret;
 660
 661         if (!vdev)
 662                 return -EINVAL;
 663
 664         ret = vfio_platform_acpi_probe(vdev, dev);
 665         if (ret)
 666                 ret = vfio_platform_of_probe(vdev, dev);
 667
 668         if (ret)
 669                 return ret;
 670
 671         vdev->device = dev;
 672
 673         ret = vfio_platform_get_reset(vdev);
 674         if (ret && vdev->reset_required) {
 675                 dev_err(dev, "No reset function found for device %s\n",
 676                         vdev->name);
 677                 return ret;
 678         }
 679
 680         group = vfio_iommu_group_get(dev);
 681         if (!group) {
 682                 dev_err(dev, "No IOMMU group for device %s\n", vdev->name);
 683                 ret = -EINVAL;
 684                 goto put_reset;
 685         }
 686
 687         ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
 688         if (ret)
 689                 goto put_iommu;
 690
 691         mutex_init(&vdev->igate);
 692
 693         pm_runtime_enable(vdev->device);
 694         return 0;
 695
 696 put_iommu:
 697         vfio_iommu_group_put(group, dev);
 698 put_reset:
 699         vfio_platform_put_reset(vdev);
 700         return ret;
 701 }
 702 EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
 703
 704 struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
 705 {
 706         struct vfio_platform_device *vdev;
 707
 708         vdev = vfio_del_group_dev(dev);
 709
 710         if (vdev) {
 711                 pm_runtime_disable(vdev->device);
 712                 vfio_platform_put_reset(vdev);
 713                 vfio_iommu_group_put(dev->iommu_group, dev);
 714         }
 715
 716         return vdev;
 717 }
 718 EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
 719
 720 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
 721 {
 722         mutex_lock(&driver_lock);
 723         list_add(&node->link, &reset_list);
 724         mutex_unlock(&driver_lock);
 725 }
 726 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
 727
 728 void vfio_platform_unregister_reset(const char *compat,
 729                                     vfio_platform_reset_fn_t fn)
 730 {
 731         struct vfio_platform_reset_node *iter, *temp;
 732
 733         mutex_lock(&driver_lock);
 734         list_for_each_entry_safe(iter, temp, &reset_list, link) {
 735                 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) {
 736                         list_del(&iter->link);
 737                         break;
 738                 }
 739         }
 740
 741         mutex_unlock(&driver_lock);
 742
 743 }
 744 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
 745
 746 MODULE_VERSION(DRIVER_VERSION);
 747 MODULE_LICENSE("GPL v2");
 748 MODULE_AUTHOR(DRIVER_AUTHOR);
 749 MODULE_DESCRIPTION(DRIVER_DESC);