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 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_release(void *device_data)
 222 {
 223         struct vfio_platform_device *vdev = device_data;
 224
 225         mutex_lock(&driver_lock);
 226
 227         if (!(--vdev->refcnt)) {
 228                 const char *extra_dbg = NULL;
 229                 int ret;
 230
 231                 ret = vfio_platform_call_reset(vdev, &extra_dbg);
 232                 if (ret && vdev->reset_required) {
 233                         dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n",
 234                                  ret, extra_dbg ? extra_dbg : "");
 235                         WARN_ON(1);
 236                 }
 237                 pm_runtime_put(vdev->device);
 238                 vfio_platform_regions_cleanup(vdev);
 239                 vfio_platform_irq_cleanup(vdev);
 240         }
 241
 242         mutex_unlock(&driver_lock);
 243
 244         module_put(vdev->parent_module);
 245 }
 246
 247 static int vfio_platform_open(void *device_data)
 248 {
 249         struct vfio_platform_device *vdev = device_data;
 250         int ret;
 251
 252         if (!try_module_get(vdev->parent_module))
 253                 return -ENODEV;
 254
 255         mutex_lock(&driver_lock);
 256
 257         if (!vdev->refcnt) {
 258                 const char *extra_dbg = NULL;
 259
 260                 ret = vfio_platform_regions_init(vdev);
 261                 if (ret)
 262                         goto err_reg;
 263
 264                 ret = vfio_platform_irq_init(vdev);
 265                 if (ret)
 266                         goto err_irq;
 267
 268                 ret = pm_runtime_get_sync(vdev->device);
 269                 if (ret < 0)
 270                         goto err_rst;
 271
 272                 ret = vfio_platform_call_reset(vdev, &extra_dbg);
 273                 if (ret && vdev->reset_required) {
 274                         dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n",
 275                                  ret, extra_dbg ? extra_dbg : "");
 276                         goto err_rst;
 277                 }
 278         }
 279
 280         vdev->refcnt++;
 281
 282         mutex_unlock(&driver_lock);
 283         return 0;
 284
 285 err_rst:
 286         pm_runtime_put(vdev->device);
 287         vfio_platform_irq_cleanup(vdev);
 288 err_irq:
 289         vfio_platform_regions_cleanup(vdev);
 290 err_reg:
 291         mutex_unlock(&driver_lock);
 292         module_put(THIS_MODULE);
 293         return ret;
 294 }
 295
 296 static long vfio_platform_ioctl(void *device_data,
 297                                 unsigned int cmd, unsigned long arg)
 298 {
 299         struct vfio_platform_device *vdev = device_data;
 300         unsigned long minsz;
 301
 302         if (cmd == VFIO_DEVICE_GET_INFO) {
 303                 struct vfio_device_info info;
 304
 305                 minsz = offsetofend(struct vfio_device_info, num_irqs);
 306
 307                 if (copy_from_user(&info, (void __user *)arg, minsz))
 308                         return -EFAULT;
 309
 310                 if (info.argsz < minsz)
 311                         return -EINVAL;
 312
 313                 if (vfio_platform_has_reset(vdev))
 314                         vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
 315                 info.flags = vdev->flags;
 316                 info.num_regions = vdev->num_regions;
 317                 info.num_irqs = vdev->num_irqs;
 318
 319                 return copy_to_user((void __user *)arg, &info, minsz) ?
 320                         -EFAULT : 0;
 321
 322         } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
 323                 struct vfio_region_info info;
 324
 325                 minsz = offsetofend(struct vfio_region_info, offset);
 326
 327                 if (copy_from_user(&info, (void __user *)arg, minsz))
 328                         return -EFAULT;
 329
 330                 if (info.argsz < minsz)
 331                         return -EINVAL;
 332
 333                 if (info.index >= vdev->num_regions)
 334                         return -EINVAL;
 335
 336                 /* map offset to the physical address  */
 337                 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
 338                 info.size = vdev->regions[info.index].size;
 339                 info.flags = vdev->regions[info.index].flags;
 340
 341                 return copy_to_user((void __user *)arg, &info, minsz) ?
 342                         -EFAULT : 0;
 343
 344         } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
 345                 struct vfio_irq_info info;
 346
 347                 minsz = offsetofend(struct vfio_irq_info, count);
 348
 349                 if (copy_from_user(&info, (void __user *)arg, minsz))
 350                         return -EFAULT;
 351
 352                 if (info.argsz < minsz)
 353                         return -EINVAL;
 354
 355                 if (info.index >= vdev->num_irqs)
 356                         return -EINVAL;
 357
 358                 info.flags = vdev->irqs[info.index].flags;
 359                 info.count = vdev->irqs[info.index].count;
 360
 361                 return copy_to_user((void __user *)arg, &info, minsz) ?
 362                         -EFAULT : 0;
 363
 364         } else if (cmd == VFIO_DEVICE_SET_IRQS) {
 365                 struct vfio_irq_set hdr;
 366                 u8 *data = NULL;
 367                 int ret = 0;
 368                 size_t data_size = 0;
 369
 370                 minsz = offsetofend(struct vfio_irq_set, count);
 371
 372                 if (copy_from_user(&hdr, (void __user *)arg, minsz))
 373                         return -EFAULT;
 374
 375                 ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs,
 376                                                  vdev->num_irqs, &data_size);
 377                 if (ret)
 378                         return ret;
 379
 380                 if (data_size) {
 381                         data = memdup_user((void __user *)(arg + minsz),
 382                                             data_size);
 383                         if (IS_ERR(data))
 384                                 return PTR_ERR(data);
 385                 }
 386
 387                 mutex_lock(&vdev->igate);
 388
 389                 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
 390                                                    hdr.start, hdr.count, data);
 391                 mutex_unlock(&vdev->igate);
 392                 kfree(data);
 393
 394                 return ret;
 395
 396         } else if (cmd == VFIO_DEVICE_RESET) {
 397                 return vfio_platform_call_reset(vdev, NULL);
 398         }
 399
 400         return -ENOTTY;
 401 }
 402
 403 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
 404                                        char __user *buf, size_t count,
 405                                        loff_t off)
 406 {
 407         unsigned int done = 0;
 408
 409         if (!reg->ioaddr) {
 410                 reg->ioaddr =
 411                         ioremap(reg->addr, reg->size);
 412
 413                 if (!reg->ioaddr)
 414                         return -ENOMEM;
 415         }
 416
 417         while (count) {
 418                 size_t filled;
 419
 420                 if (count >= 4 && !(off % 4)) {
 421                         u32 val;
 422
 423                         val = ioread32(reg->ioaddr + off);
 424                         if (copy_to_user(buf, &val, 4))
 425                                 goto err;
 426
 427                         filled = 4;
 428                 } else if (count >= 2 && !(off % 2)) {
 429                         u16 val;
 430
 431                         val = ioread16(reg->ioaddr + off);
 432                         if (copy_to_user(buf, &val, 2))
 433                                 goto err;
 434
 435                         filled = 2;
 436                 } else {
 437                         u8 val;
 438
 439                         val = ioread8(reg->ioaddr + off);
 440                         if (copy_to_user(buf, &val, 1))
 441                                 goto err;
 442
 443                         filled = 1;
 444                 }
 445
 446
 447                 count -= filled;
 448                 done += filled;
 449                 off += filled;
 450                 buf += filled;
 451         }
 452
 453         return done;
 454 err:
 455         return -EFAULT;
 456 }
 457
 458 static ssize_t vfio_platform_read(void *device_data, char __user *buf,
 459                                   size_t count, loff_t *ppos)
 460 {
 461         struct vfio_platform_device *vdev = device_data;
 462         unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
 463         loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
 464
 465         if (index >= vdev->num_regions)
 466                 return -EINVAL;
 467
 468         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
 469                 return -EINVAL;
 470
 471         if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
 472                 return vfio_platform_read_mmio(&vdev->regions[index],
 473                                                         buf, count, off);
 474         else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
 475                 return -EINVAL; /* not implemented */
 476
 477         return -EINVAL;
 478 }
 479
 480 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
 481                                         const char __user *buf, size_t count,
 482                                         loff_t off)
 483 {
 484         unsigned int done = 0;
 485
 486         if (!reg->ioaddr) {
 487                 reg->ioaddr =
 488                         ioremap(reg->addr, reg->size);
 489
 490                 if (!reg->ioaddr)
 491                         return -ENOMEM;
 492         }
 493
 494         while (count) {
 495                 size_t filled;
 496
 497                 if (count >= 4 && !(off % 4)) {
 498                         u32 val;
 499
 500                         if (copy_from_user(&val, buf, 4))
 501                                 goto err;
 502                         iowrite32(val, reg->ioaddr + off);
 503
 504                         filled = 4;
 505                 } else if (count >= 2 && !(off % 2)) {
 506                         u16 val;
 507
 508                         if (copy_from_user(&val, buf, 2))
 509                                 goto err;
 510                         iowrite16(val, reg->ioaddr + off);
 511
 512                         filled = 2;
 513                 } else {
 514                         u8 val;
 515
 516                         if (copy_from_user(&val, buf, 1))
 517                                 goto err;
 518                         iowrite8(val, reg->ioaddr + off);
 519
 520                         filled = 1;
 521                 }
 522
 523                 count -= filled;
 524                 done += filled;
 525                 off += filled;
 526                 buf += filled;
 527         }
 528
 529         return done;
 530 err:
 531         return -EFAULT;
 532 }
 533
 534 static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
 535                                    size_t count, loff_t *ppos)
 536 {
 537         struct vfio_platform_device *vdev = device_data;
 538         unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
 539         loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
 540
 541         if (index >= vdev->num_regions)
 542                 return -EINVAL;
 543
 544         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
 545                 return -EINVAL;
 546
 547         if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
 548                 return vfio_platform_write_mmio(&vdev->regions[index],
 549                                                         buf, count, off);
 550         else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
 551                 return -EINVAL; /* not implemented */
 552
 553         return -EINVAL;
 554 }
 555
 556 static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
 557                                    struct vm_area_struct *vma)
 558 {
 559         u64 req_len, pgoff, req_start;
 560
 561         req_len = vma->vm_end - vma->vm_start;
 562         pgoff = vma->vm_pgoff &
 563                 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
 564         req_start = pgoff << PAGE_SHIFT;
 565
 566         if (region.size < PAGE_SIZE || req_start + req_len > region.size)
 567                 return -EINVAL;
 568
 569         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 570         vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
 571
 572         return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 573                                req_len, vma->vm_page_prot);
 574 }
 575
 576 static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
 577 {
 578         struct vfio_platform_device *vdev = device_data;
 579         unsigned int index;
 580
 581         index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
 582
 583         if (vma->vm_end < vma->vm_start)
 584                 return -EINVAL;
 585         if (!(vma->vm_flags & VM_SHARED))
 586                 return -EINVAL;
 587         if (index >= vdev->num_regions)
 588                 return -EINVAL;
 589         if (vma->vm_start & ~PAGE_MASK)
 590                 return -EINVAL;
 591         if (vma->vm_end & ~PAGE_MASK)
 592                 return -EINVAL;
 593
 594         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
 595                 return -EINVAL;
 596
 597         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
 598                         && (vma->vm_flags & VM_READ))
 599                 return -EINVAL;
 600
 601         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
 602                         && (vma->vm_flags & VM_WRITE))
 603                 return -EINVAL;
 604
 605         vma->vm_private_data = vdev;
 606
 607         if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
 608                 return vfio_platform_mmap_mmio(vdev->regions[index], vma);
 609
 610         else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
 611                 return -EINVAL; /* not implemented */
 612
 613         return -EINVAL;
 614 }
 615
 616 static const struct vfio_device_ops vfio_platform_ops = {
 617         .name           = "vfio-platform",
 618         .open           = vfio_platform_open,
 619         .release        = vfio_platform_release,
 620         .ioctl          = vfio_platform_ioctl,
 621         .read           = vfio_platform_read,
 622         .write          = vfio_platform_write,
 623         .mmap           = vfio_platform_mmap,
 624 };
 625
 626 static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
 627                            struct device *dev)
 628 {
 629         int ret;
 630
 631         ret = device_property_read_string(dev, "compatible",
 632                                           &vdev->compat);
 633         if (ret)
 634                 dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name);
 635
 636         return ret;
 637 }
 638
 639 /*
 640  * There can be two kernel build combinations. One build where
 641  * ACPI is not selected in Kconfig and another one with the ACPI Kconfig.
 642  *
 643  * In the first case, vfio_platform_acpi_probe will return since
 644  * acpi_disabled is 1. DT user will not see any kind of messages from
 645  * ACPI.
 646  *
 647  * In the second case, both DT and ACPI is compiled in but the system is
 648  * booting with any of these combinations.
 649  *
 650  * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine
 651  * terminates immediately without any messages.
 652  *
 653  * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
 654  * valid checks. We cannot claim that this system is DT.
 655  */
 656 int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 657                                struct device *dev)
 658 {
 659         struct iommu_group *group;
 660         int ret;
 661
 662         if (!vdev)
 663                 return -EINVAL;
 664
 665         ret = vfio_platform_acpi_probe(vdev, dev);
 666         if (ret)
 667                 ret = vfio_platform_of_probe(vdev, dev);
 668
 669         if (ret)
 670                 return ret;
 671
 672         vdev->device = dev;
 673
 674         ret = vfio_platform_get_reset(vdev);
 675         if (ret && vdev->reset_required) {
 676                 dev_err(dev, "No reset function found for device %s\n",
 677                         vdev->name);
 678                 return ret;
 679         }
 680
 681         group = vfio_iommu_group_get(dev);
 682         if (!group) {
 683                 dev_err(dev, "No IOMMU group for device %s\n", vdev->name);
 684                 ret = -EINVAL;
 685                 goto put_reset;
 686         }
 687
 688         ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
 689         if (ret)
 690                 goto put_iommu;
 691
 692         mutex_init(&vdev->igate);
 693
 694         pm_runtime_enable(vdev->device);
 695         return 0;
 696
 697 put_iommu:
 698         vfio_iommu_group_put(group, dev);
 699 put_reset:
 700         vfio_platform_put_reset(vdev);
 701         return ret;
 702 }
 703 EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
 704
 705 struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
 706 {
 707         struct vfio_platform_device *vdev;
 708
 709         vdev = vfio_del_group_dev(dev);
 710
 711         if (vdev) {
 712                 pm_runtime_disable(vdev->device);
 713                 vfio_platform_put_reset(vdev);
 714                 vfio_iommu_group_put(dev->iommu_group, dev);
 715         }
 716
 717         return vdev;
 718 }
 719 EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
 720
 721 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
 722 {
 723         mutex_lock(&driver_lock);
 724         list_add(&node->link, &reset_list);
 725         mutex_unlock(&driver_lock);
 726 }
 727 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
 728
 729 void vfio_platform_unregister_reset(const char *compat,
 730                                     vfio_platform_reset_fn_t fn)
 731 {
 732         struct vfio_platform_reset_node *iter, *temp;
 733
 734         mutex_lock(&driver_lock);
 735         list_for_each_entry_safe(iter, temp, &reset_list, link) {
 736                 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) {
 737                         list_del(&iter->link);
 738                         break;
 739                 }
 740         }
 741
 742         mutex_unlock(&driver_lock);
 743
 744 }
 745 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
 746
 747 MODULE_VERSION(DRIVER_VERSION);
 748 MODULE_LICENSE("GPL v2");
 749 MODULE_AUTHOR(DRIVER_AUTHOR);
 750 MODULE_DESCRIPTION(DRIVER_DESC);