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