1 /*
2 * Copyright (C) 2013 - Virtual Open Systems
3 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #include <linux/device.h>
16 #include <linux/acpi.h>
17 #include <linux/iommu.h>
18 #include <linux/module.h>
19 #include <linux/mutex.h>
20 #include <linux/slab.h>
21 #include <linux/types.h>
22 #include <linux/uaccess.h>
23 #include <linux/vfio.h>
24
25 #include "vfio_platform_private.h"
26
27 #define DRIVER_VERSION "0.10"
28 #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
29 #define DRIVER_DESC "VFIO platform base module"
30
31 #define VFIO_PLATFORM_IS_ACPI(vdev) ((vdev)->acpihid != NULL)
32
33 static LIST_HEAD(reset_list);
34 static DEFINE_MUTEX(driver_lock);
35
vfio_platform_lookup_reset(const char * compat,struct module ** module)36 static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat,
37 struct module **module)
38 {
39 struct vfio_platform_reset_node *iter;
40 vfio_platform_reset_fn_t reset_fn = NULL;
41
42 mutex_lock(&driver_lock);
43 list_for_each_entry(iter, &reset_list, link) {
44 if (!strcmp(iter->compat, compat) &&
45 try_module_get(iter->owner)) {
46 *module = iter->owner;
47 reset_fn = iter->of_reset;
48 break;
49 }
50 }
51 mutex_unlock(&driver_lock);
52 return reset_fn;
53 }
54
vfio_platform_acpi_probe(struct vfio_platform_device * vdev,struct device * dev)55 static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
56 struct device *dev)
57 {
58 struct acpi_device *adev;
59
60 if (acpi_disabled)
61 return -ENOENT;
62
63 adev = ACPI_COMPANION(dev);
64 if (!adev) {
65 pr_err("VFIO: ACPI companion device not found for %s\n",
66 vdev->name);
67 return -ENODEV;
68 }
69
70 #ifdef CONFIG_ACPI
71 vdev->acpihid = acpi_device_hid(adev);
72 #endif
73 return WARN_ON(!vdev->acpihid) ? -EINVAL : 0;
74 }
75
vfio_platform_acpi_call_reset(struct vfio_platform_device * vdev,const char ** extra_dbg)76 static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev,
77 const char **extra_dbg)
78 {
79 #ifdef CONFIG_ACPI
80 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
81 struct device *dev = vdev->device;
82 acpi_handle handle = ACPI_HANDLE(dev);
83 acpi_status acpi_ret;
84
85 acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer);
86 if (ACPI_FAILURE(acpi_ret)) {
87 if (extra_dbg)
88 *extra_dbg = acpi_format_exception(acpi_ret);
89 return -EINVAL;
90 }
91
92 return 0;
93 #else
94 return -ENOENT;
95 #endif
96 }
97
vfio_platform_acpi_has_reset(struct vfio_platform_device * vdev)98 static bool vfio_platform_acpi_has_reset(struct vfio_platform_device *vdev)
99 {
100 #ifdef CONFIG_ACPI
101 struct device *dev = vdev->device;
102 acpi_handle handle = ACPI_HANDLE(dev);
103
104 return acpi_has_method(handle, "_RST");
105 #else
106 return false;
107 #endif
108 }
109
vfio_platform_has_reset(struct vfio_platform_device * vdev)110 static bool vfio_platform_has_reset(struct vfio_platform_device *vdev)
111 {
112 if (VFIO_PLATFORM_IS_ACPI(vdev))
113 return vfio_platform_acpi_has_reset(vdev);
114
115 return vdev->of_reset ? true : false;
116 }
117
vfio_platform_get_reset(struct vfio_platform_device * vdev)118 static int vfio_platform_get_reset(struct vfio_platform_device *vdev)
119 {
120 if (VFIO_PLATFORM_IS_ACPI(vdev))
121 return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT;
122
123 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
124 &vdev->reset_module);
125 if (!vdev->of_reset) {
126 request_module("vfio-reset:%s", vdev->compat);
127 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
128 &vdev->reset_module);
129 }
130
131 return vdev->of_reset ? 0 : -ENOENT;
132 }
133
vfio_platform_put_reset(struct vfio_platform_device * vdev)134 static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
135 {
136 if (VFIO_PLATFORM_IS_ACPI(vdev))
137 return;
138
139 if (vdev->of_reset)
140 module_put(vdev->reset_module);
141 }
142
vfio_platform_regions_init(struct vfio_platform_device * vdev)143 static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
144 {
145 int cnt = 0, i;
146
147 while (vdev->get_resource(vdev, cnt))
148 cnt++;
149
150 vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region),
151 GFP_KERNEL);
152 if (!vdev->regions)
153 return -ENOMEM;
154
155 for (i = 0; i < cnt; i++) {
156 struct resource *res =
157 vdev->get_resource(vdev, i);
158
159 if (!res)
160 goto err;
161
162 vdev->regions[i].addr = res->start;
163 vdev->regions[i].size = resource_size(res);
164 vdev->regions[i].flags = 0;
165
166 switch (resource_type(res)) {
167 case IORESOURCE_MEM:
168 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
169 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
170 if (!(res->flags & IORESOURCE_READONLY))
171 vdev->regions[i].flags |=
172 VFIO_REGION_INFO_FLAG_WRITE;
173
174 /*
175 * Only regions addressed with PAGE granularity may be
176 * MMAPed securely.
177 */
178 if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
179 !(vdev->regions[i].size & ~PAGE_MASK))
180 vdev->regions[i].flags |=
181 VFIO_REGION_INFO_FLAG_MMAP;
182
183 break;
184 case IORESOURCE_IO:
185 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
186 break;
187 default:
188 goto err;
189 }
190 }
191
192 vdev->num_regions = cnt;
193
194 return 0;
195 err:
196 kfree(vdev->regions);
197 return -EINVAL;
198 }
199
vfio_platform_regions_cleanup(struct vfio_platform_device * vdev)200 static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
201 {
202 int i;
203
204 for (i = 0; i < vdev->num_regions; i++)
205 iounmap(vdev->regions[i].ioaddr);
206
207 vdev->num_regions = 0;
208 kfree(vdev->regions);
209 }
210
vfio_platform_call_reset(struct vfio_platform_device * vdev,const char ** extra_dbg)211 static int vfio_platform_call_reset(struct vfio_platform_device *vdev,
212 const char **extra_dbg)
213 {
214 if (VFIO_PLATFORM_IS_ACPI(vdev)) {
215 dev_info(vdev->device, "reset\n");
216 return vfio_platform_acpi_call_reset(vdev, extra_dbg);
217 } else if (vdev->of_reset) {
218 dev_info(vdev->device, "reset\n");
219 return vdev->of_reset(vdev);
220 }
221
222 dev_warn(vdev->device, "no reset function found!\n");
223 return -EINVAL;
224 }
225
vfio_platform_release(void * device_data)226 static void vfio_platform_release(void *device_data)
227 {
228 struct vfio_platform_device *vdev = device_data;
229
230 mutex_lock(&driver_lock);
231
232 if (!(--vdev->refcnt)) {
233 const char *extra_dbg = NULL;
234 int ret;
235
236 ret = vfio_platform_call_reset(vdev, &extra_dbg);
237 if (ret && vdev->reset_required) {
238 dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n",
239 ret, extra_dbg ? extra_dbg : "");
240 WARN_ON(1);
241 }
242 vfio_platform_regions_cleanup(vdev);
243 vfio_platform_irq_cleanup(vdev);
244 }
245
246 mutex_unlock(&driver_lock);
247
248 module_put(vdev->parent_module);
249 }
250
vfio_platform_open(void * device_data)251 static int vfio_platform_open(void *device_data)
252 {
253 struct vfio_platform_device *vdev = device_data;
254 int ret;
255
256 if (!try_module_get(vdev->parent_module))
257 return -ENODEV;
258
259 mutex_lock(&driver_lock);
260
261 if (!vdev->refcnt) {
262 const char *extra_dbg = NULL;
263
264 ret = vfio_platform_regions_init(vdev);
265 if (ret)
266 goto err_reg;
267
268 ret = vfio_platform_irq_init(vdev);
269 if (ret)
270 goto err_irq;
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 vfio_platform_irq_cleanup(vdev);
287 err_irq:
288 vfio_platform_regions_cleanup(vdev);
289 err_reg:
290 mutex_unlock(&driver_lock);
291 module_put(THIS_MODULE);
292 return ret;
293 }
294
vfio_platform_ioctl(void * device_data,unsigned int cmd,unsigned long arg)295 static long vfio_platform_ioctl(void *device_data,
296 unsigned int cmd, unsigned long arg)
297 {
298 struct vfio_platform_device *vdev = device_data;
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_REGION_INFO) {
322 struct vfio_region_info info;
323
324 minsz = offsetofend(struct vfio_region_info, offset);
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_regions)
333 return -EINVAL;
334
335 /* map offset to the physical address */
336 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
337 info.size = vdev->regions[info.index].size;
338 info.flags = vdev->regions[info.index].flags;
339
340 return copy_to_user((void __user *)arg, &info, minsz) ?
341 -EFAULT : 0;
342
343 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
344 struct vfio_irq_info info;
345
346 minsz = offsetofend(struct vfio_irq_info, count);
347
348 if (copy_from_user(&info, (void __user *)arg, minsz))
349 return -EFAULT;
350
351 if (info.argsz < minsz)
352 return -EINVAL;
353
354 if (info.index >= vdev->num_irqs)
355 return -EINVAL;
356
357 info.flags = vdev->irqs[info.index].flags;
358 info.count = vdev->irqs[info.index].count;
359
360 return copy_to_user((void __user *)arg, &info, minsz) ?
361 -EFAULT : 0;
362
363 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
364 struct vfio_irq_set hdr;
365 u8 *data = NULL;
366 int ret = 0;
367
368 minsz = offsetofend(struct vfio_irq_set, count);
369
370 if (copy_from_user(&hdr, (void __user *)arg, minsz))
371 return -EFAULT;
372
373 if (hdr.argsz < minsz)
374 return -EINVAL;
375
376 if (hdr.index >= vdev->num_irqs)
377 return -EINVAL;
378
379 if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
380 VFIO_IRQ_SET_ACTION_TYPE_MASK))
381 return -EINVAL;
382
383 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
384 size_t size;
385
386 if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
387 size = sizeof(uint8_t);
388 else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
389 size = sizeof(int32_t);
390 else
391 return -EINVAL;
392
393 if (hdr.argsz - minsz < size)
394 return -EINVAL;
395
396 data = memdup_user((void __user *)(arg + minsz), size);
397 if (IS_ERR(data))
398 return PTR_ERR(data);
399 }
400
401 mutex_lock(&vdev->igate);
402
403 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
404 hdr.start, hdr.count, data);
405 mutex_unlock(&vdev->igate);
406 kfree(data);
407
408 return ret;
409
410 } else if (cmd == VFIO_DEVICE_RESET) {
411 return vfio_platform_call_reset(vdev, NULL);
412 }
413
414 return -ENOTTY;
415 }
416
vfio_platform_read_mmio(struct vfio_platform_region * reg,char __user * buf,size_t count,loff_t off)417 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
418 char __user *buf, size_t count,
419 loff_t off)
420 {
421 unsigned int done = 0;
422
423 if (!reg->ioaddr) {
424 reg->ioaddr =
425 ioremap_nocache(reg->addr, reg->size);
426
427 if (!reg->ioaddr)
428 return -ENOMEM;
429 }
430
431 while (count) {
432 size_t filled;
433
434 if (count >= 4 && !(off % 4)) {
435 u32 val;
436
437 val = ioread32(reg->ioaddr + off);
438 if (copy_to_user(buf, &val, 4))
439 goto err;
440
441 filled = 4;
442 } else if (count >= 2 && !(off % 2)) {
443 u16 val;
444
445 val = ioread16(reg->ioaddr + off);
446 if (copy_to_user(buf, &val, 2))
447 goto err;
448
449 filled = 2;
450 } else {
451 u8 val;
452
453 val = ioread8(reg->ioaddr + off);
454 if (copy_to_user(buf, &val, 1))
455 goto err;
456
457 filled = 1;
458 }
459
460
461 count -= filled;
462 done += filled;
463 off += filled;
464 buf += filled;
465 }
466
467 return done;
468 err:
469 return -EFAULT;
470 }
471
vfio_platform_read(void * device_data,char __user * buf,size_t count,loff_t * ppos)472 static ssize_t vfio_platform_read(void *device_data, char __user *buf,
473 size_t count, loff_t *ppos)
474 {
475 struct vfio_platform_device *vdev = device_data;
476 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
477 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
478
479 if (index >= vdev->num_regions)
480 return -EINVAL;
481
482 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
483 return -EINVAL;
484
485 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
486 return vfio_platform_read_mmio(&vdev->regions[index],
487 buf, count, off);
488 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
489 return -EINVAL; /* not implemented */
490
491 return -EINVAL;
492 }
493
vfio_platform_write_mmio(struct vfio_platform_region * reg,const char __user * buf,size_t count,loff_t off)494 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
495 const char __user *buf, size_t count,
496 loff_t off)
497 {
498 unsigned int done = 0;
499
500 if (!reg->ioaddr) {
501 reg->ioaddr =
502 ioremap_nocache(reg->addr, reg->size);
503
504 if (!reg->ioaddr)
505 return -ENOMEM;
506 }
507
508 while (count) {
509 size_t filled;
510
511 if (count >= 4 && !(off % 4)) {
512 u32 val;
513
514 if (copy_from_user(&val, buf, 4))
515 goto err;
516 iowrite32(val, reg->ioaddr + off);
517
518 filled = 4;
519 } else if (count >= 2 && !(off % 2)) {
520 u16 val;
521
522 if (copy_from_user(&val, buf, 2))
523 goto err;
524 iowrite16(val, reg->ioaddr + off);
525
526 filled = 2;
527 } else {
528 u8 val;
529
530 if (copy_from_user(&val, buf, 1))
531 goto err;
532 iowrite8(val, reg->ioaddr + off);
533
534 filled = 1;
535 }
536
537 count -= filled;
538 done += filled;
539 off += filled;
540 buf += filled;
541 }
542
543 return done;
544 err:
545 return -EFAULT;
546 }
547
vfio_platform_write(void * device_data,const char __user * buf,size_t count,loff_t * ppos)548 static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
549 size_t count, loff_t *ppos)
550 {
551 struct vfio_platform_device *vdev = device_data;
552 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
553 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
554
555 if (index >= vdev->num_regions)
556 return -EINVAL;
557
558 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
559 return -EINVAL;
560
561 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
562 return vfio_platform_write_mmio(&vdev->regions[index],
563 buf, count, off);
564 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
565 return -EINVAL; /* not implemented */
566
567 return -EINVAL;
568 }
569
vfio_platform_mmap_mmio(struct vfio_platform_region region,struct vm_area_struct * vma)570 static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
571 struct vm_area_struct *vma)
572 {
573 u64 req_len, pgoff, req_start;
574
575 req_len = vma->vm_end - vma->vm_start;
576 pgoff = vma->vm_pgoff &
577 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
578 req_start = pgoff << PAGE_SHIFT;
579
580 if (region.size < PAGE_SIZE || req_start + req_len > region.size)
581 return -EINVAL;
582
583 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
584 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
585
586 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
587 req_len, vma->vm_page_prot);
588 }
589
vfio_platform_mmap(void * device_data,struct vm_area_struct * vma)590 static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
591 {
592 struct vfio_platform_device *vdev = device_data;
593 unsigned int index;
594
595 index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
596
597 if (vma->vm_end < vma->vm_start)
598 return -EINVAL;
599 if (!(vma->vm_flags & VM_SHARED))
600 return -EINVAL;
601 if (index >= vdev->num_regions)
602 return -EINVAL;
603 if (vma->vm_start & ~PAGE_MASK)
604 return -EINVAL;
605 if (vma->vm_end & ~PAGE_MASK)
606 return -EINVAL;
607
608 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
609 return -EINVAL;
610
611 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
612 && (vma->vm_flags & VM_READ))
613 return -EINVAL;
614
615 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
616 && (vma->vm_flags & VM_WRITE))
617 return -EINVAL;
618
619 vma->vm_private_data = vdev;
620
621 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
622 return vfio_platform_mmap_mmio(vdev->regions[index], vma);
623
624 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
625 return -EINVAL; /* not implemented */
626
627 return -EINVAL;
628 }
629
630 static const struct vfio_device_ops vfio_platform_ops = {
631 .name = "vfio-platform",
632 .open = vfio_platform_open,
633 .release = vfio_platform_release,
634 .ioctl = vfio_platform_ioctl,
635 .read = vfio_platform_read,
636 .write = vfio_platform_write,
637 .mmap = vfio_platform_mmap,
638 };
639
vfio_platform_of_probe(struct vfio_platform_device * vdev,struct device * dev)640 static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
641 struct device *dev)
642 {
643 int ret;
644
645 ret = device_property_read_string(dev, "compatible",
646 &vdev->compat);
647 if (ret)
648 pr_err("VFIO: cannot retrieve compat for %s\n",
649 vdev->name);
650
651 return ret;
652 }
653
654 /*
655 * There can be two kernel build combinations. One build where
656 * ACPI is not selected in Kconfig and another one with the ACPI Kconfig.
657 *
658 * In the first case, vfio_platform_acpi_probe will return since
659 * acpi_disabled is 1. DT user will not see any kind of messages from
660 * ACPI.
661 *
662 * In the second case, both DT and ACPI is compiled in but the system is
663 * booting with any of these combinations.
664 *
665 * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine
666 * terminates immediately without any messages.
667 *
668 * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
669 * valid checks. We cannot claim that this system is DT.
670 */
vfio_platform_probe_common(struct vfio_platform_device * vdev,struct device * dev)671 int vfio_platform_probe_common(struct vfio_platform_device *vdev,
672 struct device *dev)
673 {
674 struct iommu_group *group;
675 int ret;
676
677 if (!vdev)
678 return -EINVAL;
679
680 ret = vfio_platform_acpi_probe(vdev, dev);
681 if (ret)
682 ret = vfio_platform_of_probe(vdev, dev);
683
684 if (ret)
685 return ret;
686
687 vdev->device = dev;
688
689 ret = vfio_platform_get_reset(vdev);
690 if (ret && vdev->reset_required) {
691 pr_err("vfio: no reset function found for device %s\n",
692 vdev->name);
693 return ret;
694 }
695
696 group = vfio_iommu_group_get(dev);
697 if (!group) {
698 pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
699 return -EINVAL;
700 }
701
702 ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
703 if (ret) {
704 vfio_iommu_group_put(group, dev);
705 return ret;
706 }
707
708 mutex_init(&vdev->igate);
709
710 return 0;
711 }
712 EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
713
vfio_platform_remove_common(struct device * dev)714 struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
715 {
716 struct vfio_platform_device *vdev;
717
718 vdev = vfio_del_group_dev(dev);
719
720 if (vdev) {
721 vfio_platform_put_reset(vdev);
722 vfio_iommu_group_put(dev->iommu_group, dev);
723 }
724
725 return vdev;
726 }
727 EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
728
__vfio_platform_register_reset(struct vfio_platform_reset_node * node)729 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
730 {
731 mutex_lock(&driver_lock);
732 list_add(&node->link, &reset_list);
733 mutex_unlock(&driver_lock);
734 }
735 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
736
vfio_platform_unregister_reset(const char * compat,vfio_platform_reset_fn_t fn)737 void vfio_platform_unregister_reset(const char *compat,
738 vfio_platform_reset_fn_t fn)
739 {
740 struct vfio_platform_reset_node *iter, *temp;
741
742 mutex_lock(&driver_lock);
743 list_for_each_entry_safe(iter, temp, &reset_list, link) {
744 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) {
745 list_del(&iter->link);
746 break;
747 }
748 }
749
750 mutex_unlock(&driver_lock);
751
752 }
753 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
754
755 MODULE_VERSION(DRIVER_VERSION);
756 MODULE_LICENSE("GPL v2");
757 MODULE_AUTHOR(DRIVER_AUTHOR);
758 MODULE_DESCRIPTION(DRIVER_DESC);
759