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(module: iter->owner)) { |
41 | *module = iter->owner; |
42 | reset_fn = iter->of_reset; |
43 | break; |
44 | } |
45 | } |
46 | mutex_unlock(lock: &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(device: 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 **) |
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(object: handle, pathname: "_RST" , NULL, NULL); |
80 | if (ACPI_FAILURE(acpi_ret)) { |
81 | if (extra_dbg) |
82 | *extra_dbg = acpi_format_exception(exception: acpi_ret); |
83 | return -EINVAL; |
84 | } |
85 | |
86 | return 0; |
87 | #else |
88 | return -ENOENT; |
89 | #endif |
90 | } |
91 | |
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, name: "_RST" ); |
99 | #else |
100 | return false; |
101 | #endif |
102 | } |
103 | |
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 | |
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(compat: vdev->compat, |
118 | module: &vdev->reset_module); |
119 | if (!vdev->of_reset) { |
120 | request_module("vfio-reset:%s" , vdev->compat); |
121 | vdev->of_reset = vfio_platform_lookup_reset(compat: vdev->compat, |
122 | module: &vdev->reset_module); |
123 | } |
124 | |
125 | return vdev->of_reset ? 0 : -ENOENT; |
126 | } |
127 | |
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(module: vdev->reset_module); |
135 | } |
136 | |
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(n: cnt, size: 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(objp: vdev->regions); |
188 | return -EINVAL; |
189 | } |
190 | |
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(addr: vdev->regions[i].ioaddr); |
197 | |
198 | vdev->num_regions = 0; |
199 | kfree(objp: vdev->regions); |
200 | } |
201 | |
202 | static int vfio_platform_call_reset(struct vfio_platform_device *vdev, |
203 | const char **) |
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 | |
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 * = NULL; |
222 | int ret; |
223 | |
224 | ret = vfio_platform_call_reset(vdev, extra_dbg: &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(dev: vdev->device); |
232 | vfio_platform_regions_cleanup(vdev); |
233 | vfio_platform_irq_cleanup(vdev); |
234 | } |
235 | EXPORT_SYMBOL_GPL(vfio_platform_close_device); |
236 | |
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 * = 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(dev: vdev->device); |
253 | if (ret < 0) |
254 | goto err_rst; |
255 | |
256 | ret = vfio_platform_call_reset(vdev, extra_dbg: &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(dev: 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 | |
275 | long vfio_platform_ioctl(struct vfio_device *core_vdev, |
276 | unsigned int cmd, unsigned long arg) |
277 | { |
278 | struct vfio_platform_device *vdev = |
279 | container_of(core_vdev, struct vfio_platform_device, vdev); |
280 | |
281 | unsigned long minsz; |
282 | |
283 | if (cmd == VFIO_DEVICE_GET_INFO) { |
284 | struct vfio_device_info info; |
285 | |
286 | minsz = offsetofend(struct vfio_device_info, num_irqs); |
287 | |
288 | if (copy_from_user(to: &info, from: (void __user *)arg, n: minsz)) |
289 | return -EFAULT; |
290 | |
291 | if (info.argsz < minsz) |
292 | return -EINVAL; |
293 | |
294 | if (vfio_platform_has_reset(vdev)) |
295 | vdev->flags |= VFIO_DEVICE_FLAGS_RESET; |
296 | info.flags = vdev->flags; |
297 | info.num_regions = vdev->num_regions; |
298 | info.num_irqs = vdev->num_irqs; |
299 | |
300 | return copy_to_user(to: (void __user *)arg, from: &info, n: minsz) ? |
301 | -EFAULT : 0; |
302 | |
303 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { |
304 | struct vfio_region_info info; |
305 | |
306 | minsz = offsetofend(struct vfio_region_info, offset); |
307 | |
308 | if (copy_from_user(to: &info, from: (void __user *)arg, n: minsz)) |
309 | return -EFAULT; |
310 | |
311 | if (info.argsz < minsz) |
312 | return -EINVAL; |
313 | |
314 | if (info.index >= vdev->num_regions) |
315 | return -EINVAL; |
316 | |
317 | /* map offset to the physical address */ |
318 | info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); |
319 | info.size = vdev->regions[info.index].size; |
320 | info.flags = vdev->regions[info.index].flags; |
321 | |
322 | return copy_to_user(to: (void __user *)arg, from: &info, n: minsz) ? |
323 | -EFAULT : 0; |
324 | |
325 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { |
326 | struct vfio_irq_info info; |
327 | |
328 | minsz = offsetofend(struct vfio_irq_info, count); |
329 | |
330 | if (copy_from_user(to: &info, from: (void __user *)arg, n: minsz)) |
331 | return -EFAULT; |
332 | |
333 | if (info.argsz < minsz) |
334 | return -EINVAL; |
335 | |
336 | if (info.index >= vdev->num_irqs) |
337 | return -EINVAL; |
338 | |
339 | info.flags = vdev->irqs[info.index].flags; |
340 | info.count = vdev->irqs[info.index].count; |
341 | |
342 | return copy_to_user(to: (void __user *)arg, from: &info, n: minsz) ? |
343 | -EFAULT : 0; |
344 | |
345 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { |
346 | struct vfio_irq_set hdr; |
347 | u8 *data = NULL; |
348 | int ret = 0; |
349 | size_t data_size = 0; |
350 | |
351 | minsz = offsetofend(struct vfio_irq_set, count); |
352 | |
353 | if (copy_from_user(to: &hdr, from: (void __user *)arg, n: minsz)) |
354 | return -EFAULT; |
355 | |
356 | ret = vfio_set_irqs_validate_and_prepare(hdr: &hdr, num_irqs: vdev->num_irqs, |
357 | max_irq_type: vdev->num_irqs, data_size: &data_size); |
358 | if (ret) |
359 | return ret; |
360 | |
361 | if (data_size) { |
362 | data = memdup_user((void __user *)(arg + minsz), |
363 | data_size); |
364 | if (IS_ERR(ptr: data)) |
365 | return PTR_ERR(ptr: data); |
366 | } |
367 | |
368 | mutex_lock(&vdev->igate); |
369 | |
370 | ret = vfio_platform_set_irqs_ioctl(vdev, flags: hdr.flags, index: hdr.index, |
371 | start: hdr.start, count: hdr.count, data); |
372 | mutex_unlock(lock: &vdev->igate); |
373 | kfree(objp: data); |
374 | |
375 | return ret; |
376 | |
377 | } else if (cmd == VFIO_DEVICE_RESET) { |
378 | return vfio_platform_call_reset(vdev, NULL); |
379 | } |
380 | |
381 | return -ENOTTY; |
382 | } |
383 | EXPORT_SYMBOL_GPL(vfio_platform_ioctl); |
384 | |
385 | static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg, |
386 | char __user *buf, size_t count, |
387 | loff_t off) |
388 | { |
389 | unsigned int done = 0; |
390 | |
391 | if (!reg->ioaddr) { |
392 | reg->ioaddr = |
393 | ioremap(offset: reg->addr, size: reg->size); |
394 | |
395 | if (!reg->ioaddr) |
396 | return -ENOMEM; |
397 | } |
398 | |
399 | while (count) { |
400 | size_t filled; |
401 | |
402 | if (count >= 4 && !(off % 4)) { |
403 | u32 val; |
404 | |
405 | val = ioread32(reg->ioaddr + off); |
406 | if (copy_to_user(to: buf, from: &val, n: 4)) |
407 | goto err; |
408 | |
409 | filled = 4; |
410 | } else if (count >= 2 && !(off % 2)) { |
411 | u16 val; |
412 | |
413 | val = ioread16(reg->ioaddr + off); |
414 | if (copy_to_user(to: buf, from: &val, n: 2)) |
415 | goto err; |
416 | |
417 | filled = 2; |
418 | } else { |
419 | u8 val; |
420 | |
421 | val = ioread8(reg->ioaddr + off); |
422 | if (copy_to_user(to: buf, from: &val, n: 1)) |
423 | goto err; |
424 | |
425 | filled = 1; |
426 | } |
427 | |
428 | |
429 | count -= filled; |
430 | done += filled; |
431 | off += filled; |
432 | buf += filled; |
433 | } |
434 | |
435 | return done; |
436 | err: |
437 | return -EFAULT; |
438 | } |
439 | |
440 | ssize_t vfio_platform_read(struct vfio_device *core_vdev, |
441 | char __user *buf, size_t count, loff_t *ppos) |
442 | { |
443 | struct vfio_platform_device *vdev = |
444 | container_of(core_vdev, struct vfio_platform_device, vdev); |
445 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
446 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
447 | |
448 | if (index >= vdev->num_regions) |
449 | return -EINVAL; |
450 | |
451 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) |
452 | return -EINVAL; |
453 | |
454 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
455 | return vfio_platform_read_mmio(reg: &vdev->regions[index], |
456 | buf, count, off); |
457 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
458 | return -EINVAL; /* not implemented */ |
459 | |
460 | return -EINVAL; |
461 | } |
462 | EXPORT_SYMBOL_GPL(vfio_platform_read); |
463 | |
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(offset: reg->addr, size: 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(to: &val, from: buf, n: 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(to: &val, from: buf, n: 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(to: &val, from: buf, n: 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 | |
518 | 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(reg: &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 | EXPORT_SYMBOL_GPL(vfio_platform_write); |
541 | |
542 | static int vfio_platform_mmap_mmio(struct vfio_platform_region region, |
543 | struct vm_area_struct *vma) |
544 | { |
545 | u64 req_len, pgoff, req_start; |
546 | |
547 | req_len = vma->vm_end - vma->vm_start; |
548 | pgoff = vma->vm_pgoff & |
549 | ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1); |
550 | req_start = pgoff << PAGE_SHIFT; |
551 | |
552 | if (region.size < PAGE_SIZE || req_start + req_len > region.size) |
553 | return -EINVAL; |
554 | |
555 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
556 | vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; |
557 | |
558 | return remap_pfn_range(vma, addr: vma->vm_start, pfn: vma->vm_pgoff, |
559 | size: req_len, vma->vm_page_prot); |
560 | } |
561 | |
562 | int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma) |
563 | { |
564 | struct vfio_platform_device *vdev = |
565 | container_of(core_vdev, struct vfio_platform_device, vdev); |
566 | unsigned int index; |
567 | |
568 | index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT); |
569 | |
570 | if (vma->vm_end < vma->vm_start) |
571 | return -EINVAL; |
572 | if (!(vma->vm_flags & VM_SHARED)) |
573 | return -EINVAL; |
574 | if (index >= vdev->num_regions) |
575 | return -EINVAL; |
576 | if (vma->vm_start & ~PAGE_MASK) |
577 | return -EINVAL; |
578 | if (vma->vm_end & ~PAGE_MASK) |
579 | return -EINVAL; |
580 | |
581 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) |
582 | return -EINVAL; |
583 | |
584 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) |
585 | && (vma->vm_flags & VM_READ)) |
586 | return -EINVAL; |
587 | |
588 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) |
589 | && (vma->vm_flags & VM_WRITE)) |
590 | return -EINVAL; |
591 | |
592 | vma->vm_private_data = vdev; |
593 | |
594 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
595 | return vfio_platform_mmap_mmio(region: vdev->regions[index], vma); |
596 | |
597 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
598 | return -EINVAL; /* not implemented */ |
599 | |
600 | return -EINVAL; |
601 | } |
602 | EXPORT_SYMBOL_GPL(vfio_platform_mmap); |
603 | |
604 | static int vfio_platform_of_probe(struct vfio_platform_device *vdev, |
605 | struct device *dev) |
606 | { |
607 | int ret; |
608 | |
609 | ret = device_property_read_string(dev, propname: "compatible" , |
610 | val: &vdev->compat); |
611 | if (ret) |
612 | dev_err(dev, "Cannot retrieve compat for %s\n" , vdev->name); |
613 | |
614 | return ret; |
615 | } |
616 | |
617 | /* |
618 | * There can be two kernel build combinations. One build where |
619 | * ACPI is not selected in Kconfig and another one with the ACPI Kconfig. |
620 | * |
621 | * In the first case, vfio_platform_acpi_probe will return since |
622 | * acpi_disabled is 1. DT user will not see any kind of messages from |
623 | * ACPI. |
624 | * |
625 | * In the second case, both DT and ACPI is compiled in but the system is |
626 | * booting with any of these combinations. |
627 | * |
628 | * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine |
629 | * terminates immediately without any messages. |
630 | * |
631 | * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are |
632 | * valid checks. We cannot claim that this system is DT. |
633 | */ |
634 | int vfio_platform_init_common(struct vfio_platform_device *vdev) |
635 | { |
636 | int ret; |
637 | struct device *dev = vdev->vdev.dev; |
638 | |
639 | ret = vfio_platform_acpi_probe(vdev, dev); |
640 | if (ret) |
641 | ret = vfio_platform_of_probe(vdev, dev); |
642 | |
643 | if (ret) |
644 | return ret; |
645 | |
646 | vdev->device = dev; |
647 | mutex_init(&vdev->igate); |
648 | |
649 | ret = vfio_platform_get_reset(vdev); |
650 | if (ret && vdev->reset_required) { |
651 | dev_err(dev, "No reset function found for device %s\n" , |
652 | vdev->name); |
653 | return ret; |
654 | } |
655 | |
656 | return 0; |
657 | } |
658 | EXPORT_SYMBOL_GPL(vfio_platform_init_common); |
659 | |
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 | |
666 | void __vfio_platform_register_reset(struct vfio_platform_reset_node *node) |
667 | { |
668 | mutex_lock(&driver_lock); |
669 | list_add(new: &node->link, head: &reset_list); |
670 | mutex_unlock(lock: &driver_lock); |
671 | } |
672 | EXPORT_SYMBOL_GPL(__vfio_platform_register_reset); |
673 | |
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(entry: &iter->link); |
683 | break; |
684 | } |
685 | } |
686 | |
687 | mutex_unlock(lock: &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 | |