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 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
vfio_platform_acpi_has_reset(struct vfio_platform_device * vdev)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
vfio_platform_has_reset(struct vfio_platform_device * vdev)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
vfio_platform_get_reset(struct vfio_platform_device * vdev)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
vfio_platform_put_reset(struct vfio_platform_device * vdev)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
vfio_platform_regions_init(struct vfio_platform_device * vdev)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
vfio_platform_regions_cleanup(struct vfio_platform_device * vdev)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
vfio_platform_call_reset(struct vfio_platform_device * vdev,const char ** extra_dbg)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
vfio_platform_close_device(struct vfio_device * core_vdev)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
vfio_platform_open_device(struct vfio_device * core_vdev)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
vfio_platform_ioctl(struct vfio_device * core_vdev,unsigned int cmd,unsigned long arg)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
vfio_platform_read_mmio(struct vfio_platform_region * reg,char __user * buf,size_t count,loff_t off)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
vfio_platform_read(struct vfio_device * core_vdev,char __user * buf,size_t count,loff_t * ppos)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
vfio_platform_write_mmio(struct vfio_platform_region * reg,const char __user * buf,size_t count,loff_t off)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
vfio_platform_write(struct vfio_device * core_vdev,const char __user * buf,size_t count,loff_t * ppos)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
vfio_platform_mmap_mmio(struct vfio_platform_region region,struct vm_area_struct * vma)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
vfio_platform_mmap(struct vfio_device * core_vdev,struct vm_area_struct * vma)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
vfio_platform_of_probe(struct vfio_platform_device * vdev,struct device * dev)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 */
vfio_platform_probe_common(struct vfio_platform_device * vdev,struct device * dev)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
vfio_platform_remove_common(struct vfio_platform_device * vdev)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
__vfio_platform_register_reset(struct vfio_platform_reset_node * node)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
vfio_platform_unregister_reset(const char * compat,vfio_platform_reset_fn_t fn)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);
722