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
vfio_platform_lookup_reset(const char * compat,struct module ** module)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
vfio_platform_acpi_probe(struct vfio_platform_device * vdev,struct device * dev)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
vfio_platform_acpi_call_reset(struct vfio_platform_device * vdev,const char ** extra_dbg)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
vfio_platform_acpi_has_reset(struct vfio_platform_device * vdev)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
vfio_platform_has_reset(struct vfio_platform_device * vdev)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
vfio_platform_get_reset(struct vfio_platform_device * vdev)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
vfio_platform_put_reset(struct vfio_platform_device * vdev)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
vfio_platform_regions_init(struct vfio_platform_device * vdev)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
vfio_platform_regions_cleanup(struct vfio_platform_device * vdev)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
vfio_platform_call_reset(struct vfio_platform_device * vdev,const char ** extra_dbg)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
vfio_platform_close_device(struct vfio_device * core_vdev)220 void vfio_platform_close_device(struct vfio_device *core_vdev)
221 {
222 struct vfio_platform_device *vdev =
223 container_of(core_vdev, struct vfio_platform_device, vdev);
224 const char *extra_dbg = NULL;
225 int ret;
226
227 ret = vfio_platform_call_reset(vdev, &extra_dbg);
228 if (WARN_ON(ret && vdev->reset_required)) {
229 dev_warn(
230 vdev->device,
231 "reset driver is required and reset call failed in release (%d) %s\n",
232 ret, extra_dbg ? extra_dbg : "");
233 }
234 pm_runtime_put(vdev->device);
235 vfio_platform_regions_cleanup(vdev);
236 vfio_platform_irq_cleanup(vdev);
237 }
238 EXPORT_SYMBOL_GPL(vfio_platform_close_device);
239
vfio_platform_open_device(struct vfio_device * core_vdev)240 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 EXPORT_SYMBOL_GPL(vfio_platform_open_device);
277
vfio_platform_ioctl(struct vfio_device * core_vdev,unsigned int cmd,unsigned long arg)278 long vfio_platform_ioctl(struct vfio_device *core_vdev,
279 unsigned int cmd, unsigned long arg)
280 {
281 struct vfio_platform_device *vdev =
282 container_of(core_vdev, struct vfio_platform_device, vdev);
283
284 unsigned long minsz;
285
286 if (cmd == VFIO_DEVICE_GET_INFO) {
287 struct vfio_device_info info;
288
289 minsz = offsetofend(struct vfio_device_info, num_irqs);
290
291 if (copy_from_user(&info, (void __user *)arg, minsz))
292 return -EFAULT;
293
294 if (info.argsz < minsz)
295 return -EINVAL;
296
297 if (vfio_platform_has_reset(vdev))
298 vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
299 info.flags = vdev->flags;
300 info.num_regions = vdev->num_regions;
301 info.num_irqs = vdev->num_irqs;
302
303 return copy_to_user((void __user *)arg, &info, minsz) ?
304 -EFAULT : 0;
305
306 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
307 struct vfio_region_info info;
308
309 minsz = offsetofend(struct vfio_region_info, offset);
310
311 if (copy_from_user(&info, (void __user *)arg, minsz))
312 return -EFAULT;
313
314 if (info.argsz < minsz)
315 return -EINVAL;
316
317 if (info.index >= vdev->num_regions)
318 return -EINVAL;
319
320 /* map offset to the physical address */
321 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
322 info.size = vdev->regions[info.index].size;
323 info.flags = vdev->regions[info.index].flags;
324
325 return copy_to_user((void __user *)arg, &info, minsz) ?
326 -EFAULT : 0;
327
328 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
329 struct vfio_irq_info info;
330
331 minsz = offsetofend(struct vfio_irq_info, count);
332
333 if (copy_from_user(&info, (void __user *)arg, minsz))
334 return -EFAULT;
335
336 if (info.argsz < minsz)
337 return -EINVAL;
338
339 if (info.index >= vdev->num_irqs)
340 return -EINVAL;
341
342 info.flags = vdev->irqs[info.index].flags;
343 info.count = vdev->irqs[info.index].count;
344
345 return copy_to_user((void __user *)arg, &info, minsz) ?
346 -EFAULT : 0;
347
348 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
349 struct vfio_irq_set hdr;
350 u8 *data = NULL;
351 int ret = 0;
352 size_t data_size = 0;
353
354 minsz = offsetofend(struct vfio_irq_set, count);
355
356 if (copy_from_user(&hdr, (void __user *)arg, minsz))
357 return -EFAULT;
358
359 ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs,
360 vdev->num_irqs, &data_size);
361 if (ret)
362 return ret;
363
364 if (data_size) {
365 data = memdup_user((void __user *)(arg + minsz),
366 data_size);
367 if (IS_ERR(data))
368 return PTR_ERR(data);
369 }
370
371 mutex_lock(&vdev->igate);
372
373 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
374 hdr.start, hdr.count, data);
375 mutex_unlock(&vdev->igate);
376 kfree(data);
377
378 return ret;
379
380 } else if (cmd == VFIO_DEVICE_RESET) {
381 return vfio_platform_call_reset(vdev, NULL);
382 }
383
384 return -ENOTTY;
385 }
386 EXPORT_SYMBOL_GPL(vfio_platform_ioctl);
387
vfio_platform_read_mmio(struct vfio_platform_region * reg,char __user * buf,size_t count,loff_t off)388 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
389 char __user *buf, size_t count,
390 loff_t off)
391 {
392 unsigned int done = 0;
393
394 if (!reg->ioaddr) {
395 reg->ioaddr =
396 ioremap(reg->addr, reg->size);
397
398 if (!reg->ioaddr)
399 return -ENOMEM;
400 }
401
402 while (count) {
403 size_t filled;
404
405 if (count >= 4 && !(off % 4)) {
406 u32 val;
407
408 val = ioread32(reg->ioaddr + off);
409 if (copy_to_user(buf, &val, 4))
410 goto err;
411
412 filled = 4;
413 } else if (count >= 2 && !(off % 2)) {
414 u16 val;
415
416 val = ioread16(reg->ioaddr + off);
417 if (copy_to_user(buf, &val, 2))
418 goto err;
419
420 filled = 2;
421 } else {
422 u8 val;
423
424 val = ioread8(reg->ioaddr + off);
425 if (copy_to_user(buf, &val, 1))
426 goto err;
427
428 filled = 1;
429 }
430
431
432 count -= filled;
433 done += filled;
434 off += filled;
435 buf += filled;
436 }
437
438 return done;
439 err:
440 return -EFAULT;
441 }
442
vfio_platform_read(struct vfio_device * core_vdev,char __user * buf,size_t count,loff_t * ppos)443 ssize_t vfio_platform_read(struct vfio_device *core_vdev,
444 char __user *buf, size_t count, loff_t *ppos)
445 {
446 struct vfio_platform_device *vdev =
447 container_of(core_vdev, struct vfio_platform_device, vdev);
448 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
449 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
450
451 if (index >= vdev->num_regions)
452 return -EINVAL;
453
454 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
455 return -EINVAL;
456
457 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
458 return vfio_platform_read_mmio(&vdev->regions[index],
459 buf, count, off);
460 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
461 return -EINVAL; /* not implemented */
462
463 return -EINVAL;
464 }
465 EXPORT_SYMBOL_GPL(vfio_platform_read);
466
vfio_platform_write_mmio(struct vfio_platform_region * reg,const char __user * buf,size_t count,loff_t off)467 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
468 const char __user *buf, size_t count,
469 loff_t off)
470 {
471 unsigned int done = 0;
472
473 if (!reg->ioaddr) {
474 reg->ioaddr =
475 ioremap(reg->addr, reg->size);
476
477 if (!reg->ioaddr)
478 return -ENOMEM;
479 }
480
481 while (count) {
482 size_t filled;
483
484 if (count >= 4 && !(off % 4)) {
485 u32 val;
486
487 if (copy_from_user(&val, buf, 4))
488 goto err;
489 iowrite32(val, reg->ioaddr + off);
490
491 filled = 4;
492 } else if (count >= 2 && !(off % 2)) {
493 u16 val;
494
495 if (copy_from_user(&val, buf, 2))
496 goto err;
497 iowrite16(val, reg->ioaddr + off);
498
499 filled = 2;
500 } else {
501 u8 val;
502
503 if (copy_from_user(&val, buf, 1))
504 goto err;
505 iowrite8(val, reg->ioaddr + off);
506
507 filled = 1;
508 }
509
510 count -= filled;
511 done += filled;
512 off += filled;
513 buf += filled;
514 }
515
516 return done;
517 err:
518 return -EFAULT;
519 }
520
vfio_platform_write(struct vfio_device * core_vdev,const char __user * buf,size_t count,loff_t * ppos)521 ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __user *buf,
522 size_t count, loff_t *ppos)
523 {
524 struct vfio_platform_device *vdev =
525 container_of(core_vdev, struct vfio_platform_device, vdev);
526 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
527 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
528
529 if (index >= vdev->num_regions)
530 return -EINVAL;
531
532 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
533 return -EINVAL;
534
535 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
536 return vfio_platform_write_mmio(&vdev->regions[index],
537 buf, count, off);
538 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
539 return -EINVAL; /* not implemented */
540
541 return -EINVAL;
542 }
543 EXPORT_SYMBOL_GPL(vfio_platform_write);
544
vfio_platform_mmap_mmio(struct vfio_platform_region region,struct vm_area_struct * vma)545 static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
546 struct vm_area_struct *vma)
547 {
548 u64 req_len, pgoff, req_start;
549
550 req_len = vma->vm_end - vma->vm_start;
551 pgoff = vma->vm_pgoff &
552 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
553 req_start = pgoff << PAGE_SHIFT;
554
555 if (region.size < PAGE_SIZE || req_start + req_len > region.size)
556 return -EINVAL;
557
558 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
559 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
560
561 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
562 req_len, vma->vm_page_prot);
563 }
564
vfio_platform_mmap(struct vfio_device * core_vdev,struct vm_area_struct * vma)565 int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
566 {
567 struct vfio_platform_device *vdev =
568 container_of(core_vdev, struct vfio_platform_device, vdev);
569 unsigned int index;
570
571 index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
572
573 if (vma->vm_end < vma->vm_start)
574 return -EINVAL;
575 if (!(vma->vm_flags & VM_SHARED))
576 return -EINVAL;
577 if (index >= vdev->num_regions)
578 return -EINVAL;
579 if (vma->vm_start & ~PAGE_MASK)
580 return -EINVAL;
581 if (vma->vm_end & ~PAGE_MASK)
582 return -EINVAL;
583
584 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
585 return -EINVAL;
586
587 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
588 && (vma->vm_flags & VM_READ))
589 return -EINVAL;
590
591 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
592 && (vma->vm_flags & VM_WRITE))
593 return -EINVAL;
594
595 vma->vm_private_data = vdev;
596
597 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
598 return vfio_platform_mmap_mmio(vdev->regions[index], vma);
599
600 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
601 return -EINVAL; /* not implemented */
602
603 return -EINVAL;
604 }
605 EXPORT_SYMBOL_GPL(vfio_platform_mmap);
606
vfio_platform_of_probe(struct vfio_platform_device * vdev,struct device * dev)607 static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
608 struct device *dev)
609 {
610 int ret;
611
612 ret = device_property_read_string(dev, "compatible",
613 &vdev->compat);
614 if (ret)
615 dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name);
616
617 return ret;
618 }
619
620 /*
621 * There can be two kernel build combinations. One build where
622 * ACPI is not selected in Kconfig and another one with the ACPI Kconfig.
623 *
624 * In the first case, vfio_platform_acpi_probe will return since
625 * acpi_disabled is 1. DT user will not see any kind of messages from
626 * ACPI.
627 *
628 * In the second case, both DT and ACPI is compiled in but the system is
629 * booting with any of these combinations.
630 *
631 * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine
632 * terminates immediately without any messages.
633 *
634 * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
635 * valid checks. We cannot claim that this system is DT.
636 */
vfio_platform_init_common(struct vfio_platform_device * vdev)637 int vfio_platform_init_common(struct vfio_platform_device *vdev)
638 {
639 int ret;
640 struct device *dev = vdev->vdev.dev;
641
642 ret = vfio_platform_acpi_probe(vdev, dev);
643 if (ret)
644 ret = vfio_platform_of_probe(vdev, dev);
645
646 if (ret)
647 return ret;
648
649 vdev->device = dev;
650 mutex_init(&vdev->igate);
651
652 ret = vfio_platform_get_reset(vdev);
653 if (ret && vdev->reset_required)
654 dev_err(dev, "No reset function found for device %s\n",
655 vdev->name);
656 return ret;
657 }
658 EXPORT_SYMBOL_GPL(vfio_platform_init_common);
659
vfio_platform_release_common(struct vfio_platform_device * vdev)660 void vfio_platform_release_common(struct vfio_platform_device *vdev)
661 {
662 vfio_platform_put_reset(vdev);
663 }
664 EXPORT_SYMBOL_GPL(vfio_platform_release_common);
665
__vfio_platform_register_reset(struct vfio_platform_reset_node * node)666 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
667 {
668 mutex_lock(&driver_lock);
669 list_add(&node->link, &reset_list);
670 mutex_unlock(&driver_lock);
671 }
672 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
673
vfio_platform_unregister_reset(const char * compat,vfio_platform_reset_fn_t fn)674 void vfio_platform_unregister_reset(const char *compat,
675 vfio_platform_reset_fn_t fn)
676 {
677 struct vfio_platform_reset_node *iter, *temp;
678
679 mutex_lock(&driver_lock);
680 list_for_each_entry_safe(iter, temp, &reset_list, link) {
681 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) {
682 list_del(&iter->link);
683 break;
684 }
685 }
686
687 mutex_unlock(&driver_lock);
688
689 }
690 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
691
692 MODULE_VERSION(DRIVER_VERSION);
693 MODULE_LICENSE("GPL v2");
694 MODULE_AUTHOR(DRIVER_AUTHOR);
695 MODULE_DESCRIPTION(DRIVER_DESC);
696