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_ACCOUNT);
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 vdev->regions[i].addr = res->start;
154 vdev->regions[i].size = resource_size(res);
155 vdev->regions[i].flags = 0;
156
157 switch (resource_type(res)) {
158 case IORESOURCE_MEM:
159 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
160 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
161 if (!(res->flags & IORESOURCE_READONLY))
162 vdev->regions[i].flags |=
163 VFIO_REGION_INFO_FLAG_WRITE;
164
165 /*
166 * Only regions addressed with PAGE granularity may be
167 * MMAPed securely.
168 */
169 if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
170 !(vdev->regions[i].size & ~PAGE_MASK))
171 vdev->regions[i].flags |=
172 VFIO_REGION_INFO_FLAG_MMAP;
173
174 break;
175 case IORESOURCE_IO:
176 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
177 break;
178 default:
179 goto err;
180 }
181 }
182
183 vdev->num_regions = cnt;
184
185 return 0;
186 err:
187 kfree(vdev->regions);
188 return -EINVAL;
189 }
190
vfio_platform_regions_cleanup(struct vfio_platform_device * vdev)191 static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
192 {
193 int i;
194
195 for (i = 0; i < vdev->num_regions; i++)
196 iounmap(vdev->regions[i].ioaddr);
197
198 vdev->num_regions = 0;
199 kfree(vdev->regions);
200 }
201
vfio_platform_call_reset(struct vfio_platform_device * vdev,const char ** extra_dbg)202 static int vfio_platform_call_reset(struct vfio_platform_device *vdev,
203 const char **extra_dbg)
204 {
205 if (VFIO_PLATFORM_IS_ACPI(vdev)) {
206 dev_info(vdev->device, "reset\n");
207 return vfio_platform_acpi_call_reset(vdev, extra_dbg);
208 } else if (vdev->of_reset) {
209 dev_info(vdev->device, "reset\n");
210 return vdev->of_reset(vdev);
211 }
212
213 dev_warn(vdev->device, "no reset function found!\n");
214 return -EINVAL;
215 }
216
vfio_platform_close_device(struct vfio_device * core_vdev)217 void vfio_platform_close_device(struct vfio_device *core_vdev)
218 {
219 struct vfio_platform_device *vdev =
220 container_of(core_vdev, struct vfio_platform_device, vdev);
221 const char *extra_dbg = NULL;
222 int ret;
223
224 ret = vfio_platform_call_reset(vdev, &extra_dbg);
225 if (WARN_ON(ret && vdev->reset_required)) {
226 dev_warn(
227 vdev->device,
228 "reset driver is required and reset call failed in release (%d) %s\n",
229 ret, extra_dbg ? extra_dbg : "");
230 }
231 pm_runtime_put(vdev->device);
232 vfio_platform_regions_cleanup(vdev);
233 vfio_platform_irq_cleanup(vdev);
234 }
235 EXPORT_SYMBOL_GPL(vfio_platform_close_device);
236
vfio_platform_open_device(struct vfio_device * core_vdev)237 int vfio_platform_open_device(struct vfio_device *core_vdev)
238 {
239 struct vfio_platform_device *vdev =
240 container_of(core_vdev, struct vfio_platform_device, vdev);
241 const char *extra_dbg = NULL;
242 int ret;
243
244 ret = vfio_platform_regions_init(vdev);
245 if (ret)
246 return ret;
247
248 ret = vfio_platform_irq_init(vdev);
249 if (ret)
250 goto err_irq;
251
252 ret = pm_runtime_get_sync(vdev->device);
253 if (ret < 0)
254 goto err_rst;
255
256 ret = vfio_platform_call_reset(vdev, &extra_dbg);
257 if (ret && vdev->reset_required) {
258 dev_warn(
259 vdev->device,
260 "reset driver is required and reset call failed in open (%d) %s\n",
261 ret, extra_dbg ? extra_dbg : "");
262 goto err_rst;
263 }
264 return 0;
265
266 err_rst:
267 pm_runtime_put(vdev->device);
268 vfio_platform_irq_cleanup(vdev);
269 err_irq:
270 vfio_platform_regions_cleanup(vdev);
271 return ret;
272 }
273 EXPORT_SYMBOL_GPL(vfio_platform_open_device);
274
vfio_platform_ioctl_get_region_info(struct vfio_device * core_vdev,struct vfio_region_info * info,struct vfio_info_cap * caps)275 int vfio_platform_ioctl_get_region_info(struct vfio_device *core_vdev,
276 struct vfio_region_info *info,
277 struct vfio_info_cap *caps)
278 {
279 struct vfio_platform_device *vdev =
280 container_of(core_vdev, struct vfio_platform_device, vdev);
281
282 if (info->index >= vdev->num_regions)
283 return -EINVAL;
284
285 /* map offset to the physical address */
286 info->offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info->index);
287 info->size = vdev->regions[info->index].size;
288 info->flags = vdev->regions[info->index].flags;
289 return 0;
290 }
291 EXPORT_SYMBOL_GPL(vfio_platform_ioctl_get_region_info);
292
vfio_platform_ioctl(struct vfio_device * core_vdev,unsigned int cmd,unsigned long arg)293 long vfio_platform_ioctl(struct vfio_device *core_vdev,
294 unsigned int cmd, unsigned long arg)
295 {
296 struct vfio_platform_device *vdev =
297 container_of(core_vdev, struct vfio_platform_device, vdev);
298
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_IRQ_INFO) {
322 struct vfio_irq_info info;
323
324 minsz = offsetofend(struct vfio_irq_info, count);
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_irqs)
333 return -EINVAL;
334
335 info.flags = vdev->irqs[info.index].flags;
336 info.count = vdev->irqs[info.index].count;
337
338 return copy_to_user((void __user *)arg, &info, minsz) ?
339 -EFAULT : 0;
340
341 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
342 struct vfio_irq_set hdr;
343 u8 *data = NULL;
344 int ret = 0;
345 size_t data_size = 0;
346
347 minsz = offsetofend(struct vfio_irq_set, count);
348
349 if (copy_from_user(&hdr, (void __user *)arg, minsz))
350 return -EFAULT;
351
352 ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs,
353 vdev->num_irqs, &data_size);
354 if (ret)
355 return ret;
356
357 if (data_size) {
358 data = memdup_user((void __user *)(arg + minsz),
359 data_size);
360 if (IS_ERR(data))
361 return PTR_ERR(data);
362 }
363
364 mutex_lock(&vdev->igate);
365
366 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
367 hdr.start, hdr.count, data);
368 mutex_unlock(&vdev->igate);
369 kfree(data);
370
371 return ret;
372
373 } else if (cmd == VFIO_DEVICE_RESET) {
374 return vfio_platform_call_reset(vdev, NULL);
375 }
376
377 return -ENOTTY;
378 }
379 EXPORT_SYMBOL_GPL(vfio_platform_ioctl);
380
vfio_platform_read_mmio(struct vfio_platform_region * reg,char __user * buf,size_t count,loff_t off)381 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
382 char __user *buf, size_t count,
383 loff_t off)
384 {
385 unsigned int done = 0;
386
387 if (off >= reg->size)
388 return -EINVAL;
389
390 count = min_t(size_t, count, reg->size - off);
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
vfio_platform_read(struct vfio_device * core_vdev,char __user * buf,size_t count,loff_t * ppos)441 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 EXPORT_SYMBOL_GPL(vfio_platform_read);
464
vfio_platform_write_mmio(struct vfio_platform_region * reg,const char __user * buf,size_t count,loff_t off)465 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
466 const char __user *buf, size_t count,
467 loff_t off)
468 {
469 unsigned int done = 0;
470
471 if (off >= reg->size)
472 return -EINVAL;
473
474 count = min_t(size_t, count, reg->size - off);
475
476 if (!reg->ioaddr) {
477 reg->ioaddr =
478 ioremap(reg->addr, reg->size);
479
480 if (!reg->ioaddr)
481 return -ENOMEM;
482 }
483
484 while (count) {
485 size_t filled;
486
487 if (count >= 4 && !(off % 4)) {
488 u32 val;
489
490 if (copy_from_user(&val, buf, 4))
491 goto err;
492 iowrite32(val, reg->ioaddr + off);
493
494 filled = 4;
495 } else if (count >= 2 && !(off % 2)) {
496 u16 val;
497
498 if (copy_from_user(&val, buf, 2))
499 goto err;
500 iowrite16(val, reg->ioaddr + off);
501
502 filled = 2;
503 } else {
504 u8 val;
505
506 if (copy_from_user(&val, buf, 1))
507 goto err;
508 iowrite8(val, reg->ioaddr + off);
509
510 filled = 1;
511 }
512
513 count -= filled;
514 done += filled;
515 off += filled;
516 buf += filled;
517 }
518
519 return done;
520 err:
521 return -EFAULT;
522 }
523
vfio_platform_write(struct vfio_device * core_vdev,const char __user * buf,size_t count,loff_t * ppos)524 ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __user *buf,
525 size_t count, loff_t *ppos)
526 {
527 struct vfio_platform_device *vdev =
528 container_of(core_vdev, struct vfio_platform_device, vdev);
529 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
530 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
531
532 if (index >= vdev->num_regions)
533 return -EINVAL;
534
535 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
536 return -EINVAL;
537
538 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
539 return vfio_platform_write_mmio(&vdev->regions[index],
540 buf, count, off);
541 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
542 return -EINVAL; /* not implemented */
543
544 return -EINVAL;
545 }
546 EXPORT_SYMBOL_GPL(vfio_platform_write);
547
vfio_platform_mmap_mmio(struct vfio_platform_region region,struct vm_area_struct * vma)548 static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
549 struct vm_area_struct *vma)
550 {
551 u64 req_len, pgoff, req_start;
552
553 req_len = vma->vm_end - vma->vm_start;
554 pgoff = vma->vm_pgoff &
555 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
556 req_start = pgoff << PAGE_SHIFT;
557
558 if (region.size < PAGE_SIZE || req_start + req_len > region.size)
559 return -EINVAL;
560
561 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
562 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
563
564 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
565 req_len, vma->vm_page_prot);
566 }
567
vfio_platform_mmap(struct vfio_device * core_vdev,struct vm_area_struct * vma)568 int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
569 {
570 struct vfio_platform_device *vdev =
571 container_of(core_vdev, struct vfio_platform_device, vdev);
572 unsigned int index;
573
574 index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
575
576 if (vma->vm_end < vma->vm_start)
577 return -EINVAL;
578 if (!(vma->vm_flags & VM_SHARED))
579 return -EINVAL;
580 if (index >= vdev->num_regions)
581 return -EINVAL;
582 if (vma->vm_start & ~PAGE_MASK)
583 return -EINVAL;
584 if (vma->vm_end & ~PAGE_MASK)
585 return -EINVAL;
586
587 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
588 return -EINVAL;
589
590 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
591 && (vma->vm_flags & VM_READ))
592 return -EINVAL;
593
594 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
595 && (vma->vm_flags & VM_WRITE))
596 return -EINVAL;
597
598 vma->vm_private_data = vdev;
599
600 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
601 return vfio_platform_mmap_mmio(vdev->regions[index], vma);
602
603 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
604 return -EINVAL; /* not implemented */
605
606 return -EINVAL;
607 }
608 EXPORT_SYMBOL_GPL(vfio_platform_mmap);
609
vfio_platform_of_probe(struct vfio_platform_device * vdev,struct device * dev)610 static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
611 struct device *dev)
612 {
613 int ret;
614
615 ret = device_property_read_string(dev, "compatible",
616 &vdev->compat);
617 if (ret)
618 dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name);
619
620 return ret;
621 }
622
623 /*
624 * There can be two kernel build combinations. One build where
625 * ACPI is not selected in Kconfig and another one with the ACPI Kconfig.
626 *
627 * In the first case, vfio_platform_acpi_probe will return since
628 * acpi_disabled is 1. DT user will not see any kind of messages from
629 * ACPI.
630 *
631 * In the second case, both DT and ACPI is compiled in but the system is
632 * booting with any of these combinations.
633 *
634 * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine
635 * terminates immediately without any messages.
636 *
637 * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
638 * valid checks. We cannot claim that this system is DT.
639 */
vfio_platform_init_common(struct vfio_platform_device * vdev)640 int vfio_platform_init_common(struct vfio_platform_device *vdev)
641 {
642 int ret;
643 struct device *dev = vdev->vdev.dev;
644
645 ret = vfio_platform_acpi_probe(vdev, dev);
646 if (ret)
647 ret = vfio_platform_of_probe(vdev, dev);
648
649 if (ret)
650 return ret;
651
652 vdev->device = dev;
653 mutex_init(&vdev->igate);
654
655 ret = vfio_platform_get_reset(vdev);
656 if (ret && vdev->reset_required) {
657 dev_err(dev, "No reset function found for device %s\n",
658 vdev->name);
659 return ret;
660 }
661
662 return 0;
663 }
664 EXPORT_SYMBOL_GPL(vfio_platform_init_common);
665
vfio_platform_release_common(struct vfio_platform_device * vdev)666 void vfio_platform_release_common(struct vfio_platform_device *vdev)
667 {
668 vfio_platform_put_reset(vdev);
669 }
670 EXPORT_SYMBOL_GPL(vfio_platform_release_common);
671
__vfio_platform_register_reset(struct vfio_platform_reset_node * node)672 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
673 {
674 mutex_lock(&driver_lock);
675 list_add(&node->link, &reset_list);
676 mutex_unlock(&driver_lock);
677 }
678 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
679
vfio_platform_unregister_reset(const char * compat,vfio_platform_reset_fn_t fn)680 void vfio_platform_unregister_reset(const char *compat,
681 vfio_platform_reset_fn_t fn)
682 {
683 struct vfio_platform_reset_node *iter, *temp;
684
685 mutex_lock(&driver_lock);
686 list_for_each_entry_safe(iter, temp, &reset_list, link) {
687 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) {
688 list_del(&iter->link);
689 break;
690 }
691 }
692
693 mutex_unlock(&driver_lock);
694
695 }
696 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
697
698 MODULE_VERSION(DRIVER_VERSION);
699 MODULE_LICENSE("GPL v2");
700 MODULE_AUTHOR(DRIVER_AUTHOR);
701 MODULE_DESCRIPTION(DRIVER_DESC);
702