Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * file.c - part of debugfs, a tiny little debug file system
4 : *
5 : * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
6 : * Copyright (C) 2004 IBM Inc.
7 : *
8 : * debugfs is for people to use instead of /proc or /sys.
9 : * See Documentation/filesystems/ for more details.
10 : */
11 :
12 : #include <linux/module.h>
13 : #include <linux/fs.h>
14 : #include <linux/seq_file.h>
15 : #include <linux/pagemap.h>
16 : #include <linux/debugfs.h>
17 : #include <linux/io.h>
18 : #include <linux/slab.h>
19 : #include <linux/atomic.h>
20 : #include <linux/device.h>
21 : #include <linux/pm_runtime.h>
22 : #include <linux/poll.h>
23 : #include <linux/security.h>
24 :
25 : #include "internal.h"
26 :
27 : struct poll_table_struct;
28 :
29 0 : static ssize_t default_read_file(struct file *file, char __user *buf,
30 : size_t count, loff_t *ppos)
31 : {
32 0 : return 0;
33 : }
34 :
35 0 : static ssize_t default_write_file(struct file *file, const char __user *buf,
36 : size_t count, loff_t *ppos)
37 : {
38 0 : return count;
39 : }
40 :
41 : const struct file_operations debugfs_noop_file_operations = {
42 : .read = default_read_file,
43 : .write = default_write_file,
44 : .open = simple_open,
45 : .llseek = noop_llseek,
46 : };
47 :
48 : #define F_DENTRY(filp) ((filp)->f_path.dentry)
49 :
50 1764 : const struct file_operations *debugfs_real_fops(const struct file *filp)
51 : {
52 1764 : struct debugfs_fsdata *fsd = F_DENTRY(filp)->d_fsdata;
53 :
54 1764 : if ((unsigned long)fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT) {
55 : /*
56 : * Urgh, we've been called w/o a protecting
57 : * debugfs_file_get().
58 : */
59 0 : WARN_ON(1);
60 0 : return NULL;
61 : }
62 :
63 1764 : return fsd->real_fops;
64 : }
65 : EXPORT_SYMBOL_GPL(debugfs_real_fops);
66 :
67 : /**
68 : * debugfs_file_get - mark the beginning of file data access
69 : * @dentry: the dentry object whose data is being accessed.
70 : *
71 : * Up to a matching call to debugfs_file_put(), any successive call
72 : * into the file removing functions debugfs_remove() and
73 : * debugfs_remove_recursive() will block. Since associated private
74 : * file data may only get freed after a successful return of any of
75 : * the removal functions, you may safely access it after a successful
76 : * call to debugfs_file_get() without worrying about lifetime issues.
77 : *
78 : * If -%EIO is returned, the file has already been removed and thus,
79 : * it is not safe to access any of its data. If, on the other hand,
80 : * it is allowed to access the file data, zero is returned.
81 : */
82 1365 : int debugfs_file_get(struct dentry *dentry)
83 : {
84 1365 : struct debugfs_fsdata *fsd;
85 1365 : void *d_fsd;
86 :
87 1365 : d_fsd = READ_ONCE(dentry->d_fsdata);
88 1365 : if (!((unsigned long)d_fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT)) {
89 : fsd = d_fsd;
90 : } else {
91 400 : fsd = kmalloc(sizeof(*fsd), GFP_KERNEL);
92 400 : if (!fsd)
93 : return -ENOMEM;
94 :
95 400 : fsd->real_fops = (void *)((unsigned long)d_fsd &
96 : ~DEBUGFS_FSDATA_IS_REAL_FOPS_BIT);
97 400 : refcount_set(&fsd->active_users, 1);
98 400 : init_completion(&fsd->active_users_drained);
99 400 : if (cmpxchg(&dentry->d_fsdata, d_fsd, fsd) != d_fsd) {
100 0 : kfree(fsd);
101 0 : fsd = READ_ONCE(dentry->d_fsdata);
102 : }
103 : }
104 :
105 : /*
106 : * In case of a successful cmpxchg() above, this check is
107 : * strictly necessary and must follow it, see the comment in
108 : * __debugfs_remove_file().
109 : * OTOH, if the cmpxchg() hasn't been executed or wasn't
110 : * successful, this serves the purpose of not starving
111 : * removers.
112 : */
113 1365 : if (d_unlinked(dentry))
114 : return -EIO;
115 :
116 1365 : if (!refcount_inc_not_zero(&fsd->active_users))
117 0 : return -EIO;
118 :
119 : return 0;
120 : }
121 : EXPORT_SYMBOL_GPL(debugfs_file_get);
122 :
123 : /**
124 : * debugfs_file_put - mark the end of file data access
125 : * @dentry: the dentry object formerly passed to
126 : * debugfs_file_get().
127 : *
128 : * Allow any ongoing concurrent call into debugfs_remove() or
129 : * debugfs_remove_recursive() blocked by a former call to
130 : * debugfs_file_get() to proceed and return to its caller.
131 : */
132 1364 : void debugfs_file_put(struct dentry *dentry)
133 : {
134 1364 : struct debugfs_fsdata *fsd = READ_ONCE(dentry->d_fsdata);
135 :
136 1364 : if (refcount_dec_and_test(&fsd->active_users))
137 0 : complete(&fsd->active_users_drained);
138 1364 : }
139 : EXPORT_SYMBOL_GPL(debugfs_file_put);
140 :
141 : /*
142 : * Only permit access to world-readable files when the kernel is locked down.
143 : * We also need to exclude any file that has ways to write or alter it as root
144 : * can bypass the permissions check.
145 : */
146 400 : static int debugfs_locked_down(struct inode *inode,
147 : struct file *filp,
148 : const struct file_operations *real_fops)
149 : {
150 400 : if ((inode->i_mode & 07777) == 0444 &&
151 0 : !(filp->f_mode & FMODE_WRITE) &&
152 0 : !real_fops->unlocked_ioctl &&
153 0 : !real_fops->compat_ioctl &&
154 0 : !real_fops->mmap)
155 : return 0;
156 :
157 400 : if (security_locked_down(LOCKDOWN_DEBUGFS))
158 0 : return -EPERM;
159 :
160 : return 0;
161 : }
162 :
163 0 : static int open_proxy_open(struct inode *inode, struct file *filp)
164 : {
165 0 : struct dentry *dentry = F_DENTRY(filp);
166 0 : const struct file_operations *real_fops = NULL;
167 0 : int r;
168 :
169 0 : r = debugfs_file_get(dentry);
170 0 : if (r)
171 0 : return r == -EIO ? -ENOENT : r;
172 :
173 0 : real_fops = debugfs_real_fops(filp);
174 :
175 0 : r = debugfs_locked_down(inode, filp, real_fops);
176 0 : if (r)
177 0 : goto out;
178 :
179 0 : if (!fops_get(real_fops)) {
180 : #ifdef CONFIG_MODULES
181 : if (real_fops->owner &&
182 : real_fops->owner->state == MODULE_STATE_GOING)
183 : goto out;
184 : #endif
185 :
186 : /* Huh? Module did not clean up after itself at exit? */
187 0 : WARN(1, "debugfs file owner did not clean up at exit: %pd",
188 : dentry);
189 0 : r = -ENXIO;
190 0 : goto out;
191 : }
192 0 : replace_fops(filp, real_fops);
193 :
194 0 : if (real_fops->open)
195 0 : r = real_fops->open(inode, filp);
196 :
197 0 : out:
198 0 : debugfs_file_put(dentry);
199 0 : return r;
200 : }
201 :
202 : const struct file_operations debugfs_open_proxy_file_operations = {
203 : .open = open_proxy_open,
204 : };
205 :
206 : #define PROTO(args...) args
207 : #define ARGS(args...) args
208 :
209 : #define FULL_PROXY_FUNC(name, ret_type, filp, proto, args) \
210 : static ret_type full_proxy_ ## name(proto) \
211 : { \
212 : struct dentry *dentry = F_DENTRY(filp); \
213 : const struct file_operations *real_fops; \
214 : ret_type r; \
215 : \
216 : r = debugfs_file_get(dentry); \
217 : if (unlikely(r)) \
218 : return r; \
219 : real_fops = debugfs_real_fops(filp); \
220 : r = real_fops->name(args); \
221 : debugfs_file_put(dentry); \
222 : return r; \
223 : }
224 :
225 0 : FULL_PROXY_FUNC(llseek, loff_t, filp,
226 : PROTO(struct file *filp, loff_t offset, int whence),
227 : ARGS(filp, offset, whence));
228 :
229 965 : FULL_PROXY_FUNC(read, ssize_t, filp,
230 : PROTO(struct file *filp, char __user *buf, size_t size,
231 : loff_t *ppos),
232 : ARGS(filp, buf, size, ppos));
233 :
234 0 : FULL_PROXY_FUNC(write, ssize_t, filp,
235 : PROTO(struct file *filp, const char __user *buf, size_t size,
236 : loff_t *ppos),
237 : ARGS(filp, buf, size, ppos));
238 :
239 0 : FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
240 : PROTO(struct file *filp, unsigned int cmd, unsigned long arg),
241 : ARGS(filp, cmd, arg));
242 :
243 0 : static __poll_t full_proxy_poll(struct file *filp,
244 : struct poll_table_struct *wait)
245 : {
246 0 : struct dentry *dentry = F_DENTRY(filp);
247 0 : __poll_t r = 0;
248 0 : const struct file_operations *real_fops;
249 :
250 0 : if (debugfs_file_get(dentry))
251 : return EPOLLHUP;
252 :
253 0 : real_fops = debugfs_real_fops(filp);
254 0 : r = real_fops->poll(filp, wait);
255 0 : debugfs_file_put(dentry);
256 0 : return r;
257 : }
258 :
259 399 : static int full_proxy_release(struct inode *inode, struct file *filp)
260 : {
261 399 : const struct dentry *dentry = F_DENTRY(filp);
262 399 : const struct file_operations *real_fops = debugfs_real_fops(filp);
263 399 : const struct file_operations *proxy_fops = filp->f_op;
264 399 : int r = 0;
265 :
266 : /*
267 : * We must not protect this against removal races here: the
268 : * original releaser should be called unconditionally in order
269 : * not to leak any resources. Releasers must not assume that
270 : * ->i_private is still being meaningful here.
271 : */
272 399 : if (real_fops->release)
273 399 : r = real_fops->release(inode, filp);
274 :
275 399 : replace_fops(filp, d_inode(dentry)->i_fop);
276 399 : kfree(proxy_fops);
277 399 : fops_put(real_fops);
278 399 : return r;
279 : }
280 :
281 400 : static void __full_proxy_fops_init(struct file_operations *proxy_fops,
282 : const struct file_operations *real_fops)
283 : {
284 400 : proxy_fops->release = full_proxy_release;
285 400 : if (real_fops->llseek)
286 400 : proxy_fops->llseek = full_proxy_llseek;
287 400 : if (real_fops->read)
288 400 : proxy_fops->read = full_proxy_read;
289 400 : if (real_fops->write)
290 400 : proxy_fops->write = full_proxy_write;
291 400 : if (real_fops->poll)
292 0 : proxy_fops->poll = full_proxy_poll;
293 400 : if (real_fops->unlocked_ioctl)
294 0 : proxy_fops->unlocked_ioctl = full_proxy_unlocked_ioctl;
295 400 : }
296 :
297 400 : static int full_proxy_open(struct inode *inode, struct file *filp)
298 : {
299 400 : struct dentry *dentry = F_DENTRY(filp);
300 400 : const struct file_operations *real_fops = NULL;
301 400 : struct file_operations *proxy_fops = NULL;
302 400 : int r;
303 :
304 400 : r = debugfs_file_get(dentry);
305 400 : if (r)
306 0 : return r == -EIO ? -ENOENT : r;
307 :
308 400 : real_fops = debugfs_real_fops(filp);
309 :
310 400 : r = debugfs_locked_down(inode, filp, real_fops);
311 400 : if (r)
312 0 : goto out;
313 :
314 400 : if (!fops_get(real_fops)) {
315 : #ifdef CONFIG_MODULES
316 : if (real_fops->owner &&
317 : real_fops->owner->state == MODULE_STATE_GOING)
318 : goto out;
319 : #endif
320 :
321 : /* Huh? Module did not cleanup after itself at exit? */
322 0 : WARN(1, "debugfs file owner did not clean up at exit: %pd",
323 : dentry);
324 0 : r = -ENXIO;
325 0 : goto out;
326 : }
327 :
328 400 : proxy_fops = kzalloc(sizeof(*proxy_fops), GFP_KERNEL);
329 400 : if (!proxy_fops) {
330 0 : r = -ENOMEM;
331 0 : goto free_proxy;
332 : }
333 400 : __full_proxy_fops_init(proxy_fops, real_fops);
334 400 : replace_fops(filp, proxy_fops);
335 :
336 400 : if (real_fops->open) {
337 400 : r = real_fops->open(inode, filp);
338 399 : if (r) {
339 0 : replace_fops(filp, d_inode(dentry)->i_fop);
340 0 : goto free_proxy;
341 399 : } else if (filp->f_op != proxy_fops) {
342 : /* No protection against file removal anymore. */
343 0 : WARN(1, "debugfs file owner replaced proxy fops: %pd",
344 : dentry);
345 0 : goto free_proxy;
346 : }
347 : }
348 :
349 399 : goto out;
350 0 : free_proxy:
351 0 : kfree(proxy_fops);
352 0 : fops_put(real_fops);
353 399 : out:
354 399 : debugfs_file_put(dentry);
355 399 : return r;
356 : }
357 :
358 : const struct file_operations debugfs_full_proxy_file_operations = {
359 : .open = full_proxy_open,
360 : };
361 :
362 0 : ssize_t debugfs_attr_read(struct file *file, char __user *buf,
363 : size_t len, loff_t *ppos)
364 : {
365 0 : struct dentry *dentry = F_DENTRY(file);
366 0 : ssize_t ret;
367 :
368 0 : ret = debugfs_file_get(dentry);
369 0 : if (unlikely(ret))
370 : return ret;
371 0 : ret = simple_attr_read(file, buf, len, ppos);
372 0 : debugfs_file_put(dentry);
373 0 : return ret;
374 : }
375 : EXPORT_SYMBOL_GPL(debugfs_attr_read);
376 :
377 0 : ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
378 : size_t len, loff_t *ppos)
379 : {
380 0 : struct dentry *dentry = F_DENTRY(file);
381 0 : ssize_t ret;
382 :
383 0 : ret = debugfs_file_get(dentry);
384 0 : if (unlikely(ret))
385 : return ret;
386 0 : ret = simple_attr_write(file, buf, len, ppos);
387 0 : debugfs_file_put(dentry);
388 0 : return ret;
389 : }
390 : EXPORT_SYMBOL_GPL(debugfs_attr_write);
391 :
392 7 : static struct dentry *debugfs_create_mode_unsafe(const char *name, umode_t mode,
393 : struct dentry *parent, void *value,
394 : const struct file_operations *fops,
395 : const struct file_operations *fops_ro,
396 : const struct file_operations *fops_wo)
397 : {
398 : /* if there are no write bits set, make read only */
399 7 : if (!(mode & S_IWUGO))
400 6 : return debugfs_create_file_unsafe(name, mode, parent, value,
401 : fops_ro);
402 : /* if there are no read bits set, make write only */
403 1 : if (!(mode & S_IRUGO))
404 0 : return debugfs_create_file_unsafe(name, mode, parent, value,
405 : fops_wo);
406 :
407 1 : return debugfs_create_file_unsafe(name, mode, parent, value, fops);
408 : }
409 :
410 0 : static int debugfs_u8_set(void *data, u64 val)
411 : {
412 0 : *(u8 *)data = val;
413 0 : return 0;
414 : }
415 0 : static int debugfs_u8_get(void *data, u64 *val)
416 : {
417 0 : *val = *(u8 *)data;
418 0 : return 0;
419 : }
420 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u8, debugfs_u8_get, debugfs_u8_set, "%llu\n");
421 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_ro, debugfs_u8_get, NULL, "%llu\n");
422 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_wo, NULL, debugfs_u8_set, "%llu\n");
423 :
424 : /**
425 : * debugfs_create_u8 - create a debugfs file that is used to read and write an unsigned 8-bit value
426 : * @name: a pointer to a string containing the name of the file to create.
427 : * @mode: the permission that the file should have
428 : * @parent: a pointer to the parent dentry for this file. This should be a
429 : * directory dentry if set. If this parameter is %NULL, then the
430 : * file will be created in the root of the debugfs filesystem.
431 : * @value: a pointer to the variable that the file should read to and write
432 : * from.
433 : *
434 : * This function creates a file in debugfs with the given name that
435 : * contains the value of the variable @value. If the @mode variable is so
436 : * set, it can be read from, and written to.
437 : */
438 0 : void debugfs_create_u8(const char *name, umode_t mode, struct dentry *parent,
439 : u8 *value)
440 : {
441 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u8,
442 : &fops_u8_ro, &fops_u8_wo);
443 0 : }
444 : EXPORT_SYMBOL_GPL(debugfs_create_u8);
445 :
446 0 : static int debugfs_u16_set(void *data, u64 val)
447 : {
448 0 : *(u16 *)data = val;
449 0 : return 0;
450 : }
451 0 : static int debugfs_u16_get(void *data, u64 *val)
452 : {
453 0 : *val = *(u16 *)data;
454 0 : return 0;
455 : }
456 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u16, debugfs_u16_get, debugfs_u16_set, "%llu\n");
457 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_ro, debugfs_u16_get, NULL, "%llu\n");
458 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_wo, NULL, debugfs_u16_set, "%llu\n");
459 :
460 : /**
461 : * debugfs_create_u16 - create a debugfs file that is used to read and write an unsigned 16-bit value
462 : * @name: a pointer to a string containing the name of the file to create.
463 : * @mode: the permission that the file should have
464 : * @parent: a pointer to the parent dentry for this file. This should be a
465 : * directory dentry if set. If this parameter is %NULL, then the
466 : * file will be created in the root of the debugfs filesystem.
467 : * @value: a pointer to the variable that the file should read to and write
468 : * from.
469 : *
470 : * This function creates a file in debugfs with the given name that
471 : * contains the value of the variable @value. If the @mode variable is so
472 : * set, it can be read from, and written to.
473 : */
474 0 : void debugfs_create_u16(const char *name, umode_t mode, struct dentry *parent,
475 : u16 *value)
476 : {
477 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u16,
478 : &fops_u16_ro, &fops_u16_wo);
479 0 : }
480 : EXPORT_SYMBOL_GPL(debugfs_create_u16);
481 :
482 0 : static int debugfs_u32_set(void *data, u64 val)
483 : {
484 0 : *(u32 *)data = val;
485 0 : return 0;
486 : }
487 0 : static int debugfs_u32_get(void *data, u64 *val)
488 : {
489 0 : *val = *(u32 *)data;
490 0 : return 0;
491 : }
492 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u32, debugfs_u32_get, debugfs_u32_set, "%llu\n");
493 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_ro, debugfs_u32_get, NULL, "%llu\n");
494 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_wo, NULL, debugfs_u32_set, "%llu\n");
495 :
496 : /**
497 : * debugfs_create_u32 - create a debugfs file that is used to read and write an unsigned 32-bit value
498 : * @name: a pointer to a string containing the name of the file to create.
499 : * @mode: the permission that the file should have
500 : * @parent: a pointer to the parent dentry for this file. This should be a
501 : * directory dentry if set. If this parameter is %NULL, then the
502 : * file will be created in the root of the debugfs filesystem.
503 : * @value: a pointer to the variable that the file should read to and write
504 : * from.
505 : *
506 : * This function creates a file in debugfs with the given name that
507 : * contains the value of the variable @value. If the @mode variable is so
508 : * set, it can be read from, and written to.
509 : */
510 0 : void debugfs_create_u32(const char *name, umode_t mode, struct dentry *parent,
511 : u32 *value)
512 : {
513 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u32,
514 : &fops_u32_ro, &fops_u32_wo);
515 0 : }
516 : EXPORT_SYMBOL_GPL(debugfs_create_u32);
517 :
518 0 : static int debugfs_u64_set(void *data, u64 val)
519 : {
520 0 : *(u64 *)data = val;
521 0 : return 0;
522 : }
523 :
524 0 : static int debugfs_u64_get(void *data, u64 *val)
525 : {
526 0 : *val = *(u64 *)data;
527 0 : return 0;
528 : }
529 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u64, debugfs_u64_get, debugfs_u64_set, "%llu\n");
530 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_ro, debugfs_u64_get, NULL, "%llu\n");
531 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n");
532 :
533 : /**
534 : * debugfs_create_u64 - create a debugfs file that is used to read and write an unsigned 64-bit value
535 : * @name: a pointer to a string containing the name of the file to create.
536 : * @mode: the permission that the file should have
537 : * @parent: a pointer to the parent dentry for this file. This should be a
538 : * directory dentry if set. If this parameter is %NULL, then the
539 : * file will be created in the root of the debugfs filesystem.
540 : * @value: a pointer to the variable that the file should read to and write
541 : * from.
542 : *
543 : * This function creates a file in debugfs with the given name that
544 : * contains the value of the variable @value. If the @mode variable is so
545 : * set, it can be read from, and written to.
546 : */
547 5 : void debugfs_create_u64(const char *name, umode_t mode, struct dentry *parent,
548 : u64 *value)
549 : {
550 5 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u64,
551 : &fops_u64_ro, &fops_u64_wo);
552 5 : }
553 : EXPORT_SYMBOL_GPL(debugfs_create_u64);
554 :
555 0 : static int debugfs_ulong_set(void *data, u64 val)
556 : {
557 0 : *(unsigned long *)data = val;
558 0 : return 0;
559 : }
560 :
561 0 : static int debugfs_ulong_get(void *data, u64 *val)
562 : {
563 0 : *val = *(unsigned long *)data;
564 0 : return 0;
565 : }
566 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong, debugfs_ulong_get, debugfs_ulong_set,
567 : "%llu\n");
568 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_ro, debugfs_ulong_get, NULL, "%llu\n");
569 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n");
570 :
571 : /**
572 : * debugfs_create_ulong - create a debugfs file that is used to read and write
573 : * an unsigned long value.
574 : * @name: a pointer to a string containing the name of the file to create.
575 : * @mode: the permission that the file should have
576 : * @parent: a pointer to the parent dentry for this file. This should be a
577 : * directory dentry if set. If this parameter is %NULL, then the
578 : * file will be created in the root of the debugfs filesystem.
579 : * @value: a pointer to the variable that the file should read to and write
580 : * from.
581 : *
582 : * This function creates a file in debugfs with the given name that
583 : * contains the value of the variable @value. If the @mode variable is so
584 : * set, it can be read from, and written to.
585 : *
586 : * This function will return a pointer to a dentry if it succeeds. This
587 : * pointer must be passed to the debugfs_remove() function when the file is
588 : * to be removed (no automatic cleanup happens if your module is unloaded,
589 : * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
590 : * returned.
591 : *
592 : * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
593 : * be returned.
594 : */
595 2 : struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
596 : struct dentry *parent, unsigned long *value)
597 : {
598 2 : return debugfs_create_mode_unsafe(name, mode, parent, value,
599 : &fops_ulong, &fops_ulong_ro,
600 : &fops_ulong_wo);
601 : }
602 : EXPORT_SYMBOL_GPL(debugfs_create_ulong);
603 :
604 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x8, debugfs_u8_get, debugfs_u8_set, "0x%02llx\n");
605 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_ro, debugfs_u8_get, NULL, "0x%02llx\n");
606 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_wo, NULL, debugfs_u8_set, "0x%02llx\n");
607 :
608 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x16, debugfs_u16_get, debugfs_u16_set,
609 : "0x%04llx\n");
610 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_ro, debugfs_u16_get, NULL, "0x%04llx\n");
611 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_wo, NULL, debugfs_u16_set, "0x%04llx\n");
612 :
613 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, debugfs_u32_get, debugfs_u32_set,
614 : "0x%08llx\n");
615 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_ro, debugfs_u32_get, NULL, "0x%08llx\n");
616 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_wo, NULL, debugfs_u32_set, "0x%08llx\n");
617 :
618 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x64, debugfs_u64_get, debugfs_u64_set,
619 : "0x%016llx\n");
620 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_ro, debugfs_u64_get, NULL, "0x%016llx\n");
621 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_wo, NULL, debugfs_u64_set, "0x%016llx\n");
622 :
623 : /*
624 : * debugfs_create_x{8,16,32,64} - create a debugfs file that is used to read and write an unsigned {8,16,32,64}-bit value
625 : *
626 : * These functions are exactly the same as the above functions (but use a hex
627 : * output for the decimal challenged). For details look at the above unsigned
628 : * decimal functions.
629 : */
630 :
631 : /**
632 : * debugfs_create_x8 - create a debugfs file that is used to read and write an unsigned 8-bit value
633 : * @name: a pointer to a string containing the name of the file to create.
634 : * @mode: the permission that the file should have
635 : * @parent: a pointer to the parent dentry for this file. This should be a
636 : * directory dentry if set. If this parameter is %NULL, then the
637 : * file will be created in the root of the debugfs filesystem.
638 : * @value: a pointer to the variable that the file should read to and write
639 : * from.
640 : */
641 0 : void debugfs_create_x8(const char *name, umode_t mode, struct dentry *parent,
642 : u8 *value)
643 : {
644 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x8,
645 : &fops_x8_ro, &fops_x8_wo);
646 0 : }
647 : EXPORT_SYMBOL_GPL(debugfs_create_x8);
648 :
649 : /**
650 : * debugfs_create_x16 - create a debugfs file that is used to read and write an unsigned 16-bit value
651 : * @name: a pointer to a string containing the name of the file to create.
652 : * @mode: the permission that the file should have
653 : * @parent: a pointer to the parent dentry for this file. This should be a
654 : * directory dentry if set. If this parameter is %NULL, then the
655 : * file will be created in the root of the debugfs filesystem.
656 : * @value: a pointer to the variable that the file should read to and write
657 : * from.
658 : */
659 0 : void debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent,
660 : u16 *value)
661 : {
662 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x16,
663 : &fops_x16_ro, &fops_x16_wo);
664 0 : }
665 : EXPORT_SYMBOL_GPL(debugfs_create_x16);
666 :
667 : /**
668 : * debugfs_create_x32 - create a debugfs file that is used to read and write an unsigned 32-bit value
669 : * @name: a pointer to a string containing the name of the file to create.
670 : * @mode: the permission that the file should have
671 : * @parent: a pointer to the parent dentry for this file. This should be a
672 : * directory dentry if set. If this parameter is %NULL, then the
673 : * file will be created in the root of the debugfs filesystem.
674 : * @value: a pointer to the variable that the file should read to and write
675 : * from.
676 : */
677 0 : void debugfs_create_x32(const char *name, umode_t mode, struct dentry *parent,
678 : u32 *value)
679 : {
680 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x32,
681 : &fops_x32_ro, &fops_x32_wo);
682 0 : }
683 : EXPORT_SYMBOL_GPL(debugfs_create_x32);
684 :
685 : /**
686 : * debugfs_create_x64 - create a debugfs file that is used to read and write an unsigned 64-bit value
687 : * @name: a pointer to a string containing the name of the file to create.
688 : * @mode: the permission that the file should have
689 : * @parent: a pointer to the parent dentry for this file. This should be a
690 : * directory dentry if set. If this parameter is %NULL, then the
691 : * file will be created in the root of the debugfs filesystem.
692 : * @value: a pointer to the variable that the file should read to and write
693 : * from.
694 : */
695 0 : void debugfs_create_x64(const char *name, umode_t mode, struct dentry *parent,
696 : u64 *value)
697 : {
698 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x64,
699 : &fops_x64_ro, &fops_x64_wo);
700 0 : }
701 : EXPORT_SYMBOL_GPL(debugfs_create_x64);
702 :
703 :
704 0 : static int debugfs_size_t_set(void *data, u64 val)
705 : {
706 0 : *(size_t *)data = val;
707 0 : return 0;
708 : }
709 0 : static int debugfs_size_t_get(void *data, u64 *val)
710 : {
711 0 : *val = *(size_t *)data;
712 0 : return 0;
713 : }
714 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set,
715 : "%llu\n"); /* %llu and %zu are more or less the same */
716 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t_ro, debugfs_size_t_get, NULL, "%llu\n");
717 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t_wo, NULL, debugfs_size_t_set, "%llu\n");
718 :
719 : /**
720 : * debugfs_create_size_t - create a debugfs file that is used to read and write an size_t value
721 : * @name: a pointer to a string containing the name of the file to create.
722 : * @mode: the permission that the file should have
723 : * @parent: a pointer to the parent dentry for this file. This should be a
724 : * directory dentry if set. If this parameter is %NULL, then the
725 : * file will be created in the root of the debugfs filesystem.
726 : * @value: a pointer to the variable that the file should read to and write
727 : * from.
728 : */
729 0 : void debugfs_create_size_t(const char *name, umode_t mode,
730 : struct dentry *parent, size_t *value)
731 : {
732 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_size_t,
733 : &fops_size_t_ro, &fops_size_t_wo);
734 0 : }
735 : EXPORT_SYMBOL_GPL(debugfs_create_size_t);
736 :
737 0 : static int debugfs_atomic_t_set(void *data, u64 val)
738 : {
739 0 : atomic_set((atomic_t *)data, val);
740 0 : return 0;
741 : }
742 0 : static int debugfs_atomic_t_get(void *data, u64 *val)
743 : {
744 0 : *val = atomic_read((atomic_t *)data);
745 0 : return 0;
746 : }
747 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get,
748 : debugfs_atomic_t_set, "%lld\n");
749 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_ro, debugfs_atomic_t_get, NULL,
750 : "%lld\n");
751 0 : DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set,
752 : "%lld\n");
753 :
754 : /**
755 : * debugfs_create_atomic_t - create a debugfs file that is used to read and
756 : * write an atomic_t value
757 : * @name: a pointer to a string containing the name of the file to create.
758 : * @mode: the permission that the file should have
759 : * @parent: a pointer to the parent dentry for this file. This should be a
760 : * directory dentry if set. If this parameter is %NULL, then the
761 : * file will be created in the root of the debugfs filesystem.
762 : * @value: a pointer to the variable that the file should read to and write
763 : * from.
764 : */
765 0 : void debugfs_create_atomic_t(const char *name, umode_t mode,
766 : struct dentry *parent, atomic_t *value)
767 : {
768 0 : debugfs_create_mode_unsafe(name, mode, parent, value, &fops_atomic_t,
769 : &fops_atomic_t_ro, &fops_atomic_t_wo);
770 0 : }
771 : EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
772 :
773 0 : ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
774 : size_t count, loff_t *ppos)
775 : {
776 0 : char buf[3];
777 0 : bool val;
778 0 : int r;
779 0 : struct dentry *dentry = F_DENTRY(file);
780 :
781 0 : r = debugfs_file_get(dentry);
782 0 : if (unlikely(r))
783 0 : return r;
784 0 : val = *(bool *)file->private_data;
785 0 : debugfs_file_put(dentry);
786 :
787 0 : if (val)
788 0 : buf[0] = 'Y';
789 : else
790 0 : buf[0] = 'N';
791 0 : buf[1] = '\n';
792 0 : buf[2] = 0x00;
793 0 : return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
794 : }
795 : EXPORT_SYMBOL_GPL(debugfs_read_file_bool);
796 :
797 0 : ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
798 : size_t count, loff_t *ppos)
799 : {
800 0 : bool bv;
801 0 : int r;
802 0 : bool *val = file->private_data;
803 0 : struct dentry *dentry = F_DENTRY(file);
804 :
805 0 : r = kstrtobool_from_user(user_buf, count, &bv);
806 0 : if (!r) {
807 0 : r = debugfs_file_get(dentry);
808 0 : if (unlikely(r))
809 0 : return r;
810 0 : *val = bv;
811 0 : debugfs_file_put(dentry);
812 : }
813 :
814 0 : return count;
815 : }
816 : EXPORT_SYMBOL_GPL(debugfs_write_file_bool);
817 :
818 : static const struct file_operations fops_bool = {
819 : .read = debugfs_read_file_bool,
820 : .write = debugfs_write_file_bool,
821 : .open = simple_open,
822 : .llseek = default_llseek,
823 : };
824 :
825 : static const struct file_operations fops_bool_ro = {
826 : .read = debugfs_read_file_bool,
827 : .open = simple_open,
828 : .llseek = default_llseek,
829 : };
830 :
831 : static const struct file_operations fops_bool_wo = {
832 : .write = debugfs_write_file_bool,
833 : .open = simple_open,
834 : .llseek = default_llseek,
835 : };
836 :
837 : /**
838 : * debugfs_create_bool - create a debugfs file that is used to read and write a boolean value
839 : * @name: a pointer to a string containing the name of the file to create.
840 : * @mode: the permission that the file should have
841 : * @parent: a pointer to the parent dentry for this file. This should be a
842 : * directory dentry if set. If this parameter is %NULL, then the
843 : * file will be created in the root of the debugfs filesystem.
844 : * @value: a pointer to the variable that the file should read to and write
845 : * from.
846 : *
847 : * This function creates a file in debugfs with the given name that
848 : * contains the value of the variable @value. If the @mode variable is so
849 : * set, it can be read from, and written to.
850 : *
851 : * This function will return a pointer to a dentry if it succeeds. This
852 : * pointer must be passed to the debugfs_remove() function when the file is
853 : * to be removed (no automatic cleanup happens if your module is unloaded,
854 : * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
855 : * returned.
856 : *
857 : * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
858 : * be returned.
859 : */
860 0 : struct dentry *debugfs_create_bool(const char *name, umode_t mode,
861 : struct dentry *parent, bool *value)
862 : {
863 0 : return debugfs_create_mode_unsafe(name, mode, parent, value, &fops_bool,
864 : &fops_bool_ro, &fops_bool_wo);
865 : }
866 : EXPORT_SYMBOL_GPL(debugfs_create_bool);
867 :
868 0 : static ssize_t read_file_blob(struct file *file, char __user *user_buf,
869 : size_t count, loff_t *ppos)
870 : {
871 0 : struct debugfs_blob_wrapper *blob = file->private_data;
872 0 : struct dentry *dentry = F_DENTRY(file);
873 0 : ssize_t r;
874 :
875 0 : r = debugfs_file_get(dentry);
876 0 : if (unlikely(r))
877 : return r;
878 0 : r = simple_read_from_buffer(user_buf, count, ppos, blob->data,
879 : blob->size);
880 0 : debugfs_file_put(dentry);
881 0 : return r;
882 : }
883 :
884 : static const struct file_operations fops_blob = {
885 : .read = read_file_blob,
886 : .open = simple_open,
887 : .llseek = default_llseek,
888 : };
889 :
890 : /**
891 : * debugfs_create_blob - create a debugfs file that is used to read a binary blob
892 : * @name: a pointer to a string containing the name of the file to create.
893 : * @mode: the permission that the file should have
894 : * @parent: a pointer to the parent dentry for this file. This should be a
895 : * directory dentry if set. If this parameter is %NULL, then the
896 : * file will be created in the root of the debugfs filesystem.
897 : * @blob: a pointer to a struct debugfs_blob_wrapper which contains a pointer
898 : * to the blob data and the size of the data.
899 : *
900 : * This function creates a file in debugfs with the given name that exports
901 : * @blob->data as a binary blob. If the @mode variable is so set it can be
902 : * read from. Writing is not supported.
903 : *
904 : * This function will return a pointer to a dentry if it succeeds. This
905 : * pointer must be passed to the debugfs_remove() function when the file is
906 : * to be removed (no automatic cleanup happens if your module is unloaded,
907 : * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
908 : * returned.
909 : *
910 : * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
911 : * be returned.
912 : */
913 0 : struct dentry *debugfs_create_blob(const char *name, umode_t mode,
914 : struct dentry *parent,
915 : struct debugfs_blob_wrapper *blob)
916 : {
917 0 : return debugfs_create_file_unsafe(name, mode, parent, blob, &fops_blob);
918 : }
919 : EXPORT_SYMBOL_GPL(debugfs_create_blob);
920 :
921 0 : static size_t u32_format_array(char *buf, size_t bufsize,
922 : u32 *array, int array_size)
923 : {
924 0 : size_t ret = 0;
925 :
926 0 : while (--array_size >= 0) {
927 0 : size_t len;
928 0 : char term = array_size ? ' ' : '\n';
929 :
930 0 : len = snprintf(buf, bufsize, "%u%c", *array++, term);
931 0 : ret += len;
932 :
933 0 : buf += len;
934 0 : bufsize -= len;
935 : }
936 0 : return ret;
937 : }
938 :
939 0 : static int u32_array_open(struct inode *inode, struct file *file)
940 : {
941 0 : struct debugfs_u32_array *data = inode->i_private;
942 0 : int size, elements = data->n_elements;
943 0 : char *buf;
944 :
945 : /*
946 : * Max size:
947 : * - 10 digits + ' '/'\n' = 11 bytes per number
948 : * - terminating NUL character
949 : */
950 0 : size = elements*11;
951 0 : buf = kmalloc(size+1, GFP_KERNEL);
952 0 : if (!buf)
953 : return -ENOMEM;
954 0 : buf[size] = 0;
955 :
956 0 : file->private_data = buf;
957 0 : u32_format_array(buf, size, data->array, data->n_elements);
958 :
959 0 : return nonseekable_open(inode, file);
960 : }
961 :
962 0 : static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len,
963 : loff_t *ppos)
964 : {
965 0 : size_t size = strlen(file->private_data);
966 :
967 0 : return simple_read_from_buffer(buf, len, ppos,
968 : file->private_data, size);
969 : }
970 :
971 0 : static int u32_array_release(struct inode *inode, struct file *file)
972 : {
973 0 : kfree(file->private_data);
974 :
975 0 : return 0;
976 : }
977 :
978 : static const struct file_operations u32_array_fops = {
979 : .owner = THIS_MODULE,
980 : .open = u32_array_open,
981 : .release = u32_array_release,
982 : .read = u32_array_read,
983 : .llseek = no_llseek,
984 : };
985 :
986 : /**
987 : * debugfs_create_u32_array - create a debugfs file that is used to read u32
988 : * array.
989 : * @name: a pointer to a string containing the name of the file to create.
990 : * @mode: the permission that the file should have.
991 : * @parent: a pointer to the parent dentry for this file. This should be a
992 : * directory dentry if set. If this parameter is %NULL, then the
993 : * file will be created in the root of the debugfs filesystem.
994 : * @array: wrapper struct containing data pointer and size of the array.
995 : *
996 : * This function creates a file in debugfs with the given name that exports
997 : * @array as data. If the @mode variable is so set it can be read from.
998 : * Writing is not supported. Seek within the file is also not supported.
999 : * Once array is created its size can not be changed.
1000 : */
1001 0 : void debugfs_create_u32_array(const char *name, umode_t mode,
1002 : struct dentry *parent,
1003 : struct debugfs_u32_array *array)
1004 : {
1005 0 : debugfs_create_file_unsafe(name, mode, parent, array, &u32_array_fops);
1006 0 : }
1007 : EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
1008 :
1009 : #ifdef CONFIG_HAS_IOMEM
1010 :
1011 : /*
1012 : * The regset32 stuff is used to print 32-bit registers using the
1013 : * seq_file utilities. We offer printing a register set in an already-opened
1014 : * sequential file or create a debugfs file that only prints a regset32.
1015 : */
1016 :
1017 : /**
1018 : * debugfs_print_regs32 - use seq_print to describe a set of registers
1019 : * @s: the seq_file structure being used to generate output
1020 : * @regs: an array if struct debugfs_reg32 structures
1021 : * @nregs: the length of the above array
1022 : * @base: the base address to be used in reading the registers
1023 : * @prefix: a string to be prefixed to every output line
1024 : *
1025 : * This function outputs a text block describing the current values of
1026 : * some 32-bit hardware registers. It is meant to be used within debugfs
1027 : * files based on seq_file that need to show registers, intermixed with other
1028 : * information. The prefix argument may be used to specify a leading string,
1029 : * because some peripherals have several blocks of identical registers,
1030 : * for example configuration of dma channels
1031 : */
1032 0 : void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
1033 : int nregs, void __iomem *base, char *prefix)
1034 : {
1035 0 : int i;
1036 :
1037 0 : for (i = 0; i < nregs; i++, regs++) {
1038 0 : if (prefix)
1039 0 : seq_printf(s, "%s", prefix);
1040 0 : seq_printf(s, "%s = 0x%08x\n", regs->name,
1041 0 : readl(base + regs->offset));
1042 0 : if (seq_has_overflowed(s))
1043 : break;
1044 : }
1045 0 : }
1046 : EXPORT_SYMBOL_GPL(debugfs_print_regs32);
1047 :
1048 0 : static int debugfs_show_regset32(struct seq_file *s, void *data)
1049 : {
1050 0 : struct debugfs_regset32 *regset = s->private;
1051 :
1052 0 : if (regset->dev)
1053 0 : pm_runtime_get_sync(regset->dev);
1054 :
1055 0 : debugfs_print_regs32(s, regset->regs, regset->nregs, regset->base, "");
1056 :
1057 0 : if (regset->dev)
1058 0 : pm_runtime_put(regset->dev);
1059 :
1060 0 : return 0;
1061 : }
1062 :
1063 0 : static int debugfs_open_regset32(struct inode *inode, struct file *file)
1064 : {
1065 0 : return single_open(file, debugfs_show_regset32, inode->i_private);
1066 : }
1067 :
1068 : static const struct file_operations fops_regset32 = {
1069 : .open = debugfs_open_regset32,
1070 : .read = seq_read,
1071 : .llseek = seq_lseek,
1072 : .release = single_release,
1073 : };
1074 :
1075 : /**
1076 : * debugfs_create_regset32 - create a debugfs file that returns register values
1077 : * @name: a pointer to a string containing the name of the file to create.
1078 : * @mode: the permission that the file should have
1079 : * @parent: a pointer to the parent dentry for this file. This should be a
1080 : * directory dentry if set. If this parameter is %NULL, then the
1081 : * file will be created in the root of the debugfs filesystem.
1082 : * @regset: a pointer to a struct debugfs_regset32, which contains a pointer
1083 : * to an array of register definitions, the array size and the base
1084 : * address where the register bank is to be found.
1085 : *
1086 : * This function creates a file in debugfs with the given name that reports
1087 : * the names and values of a set of 32-bit registers. If the @mode variable
1088 : * is so set it can be read from. Writing is not supported.
1089 : */
1090 0 : void debugfs_create_regset32(const char *name, umode_t mode,
1091 : struct dentry *parent,
1092 : struct debugfs_regset32 *regset)
1093 : {
1094 0 : debugfs_create_file(name, mode, parent, regset, &fops_regset32);
1095 0 : }
1096 : EXPORT_SYMBOL_GPL(debugfs_create_regset32);
1097 :
1098 : #endif /* CONFIG_HAS_IOMEM */
1099 :
1100 : struct debugfs_devm_entry {
1101 : int (*read)(struct seq_file *seq, void *data);
1102 : struct device *dev;
1103 : };
1104 :
1105 0 : static int debugfs_devm_entry_open(struct inode *inode, struct file *f)
1106 : {
1107 0 : struct debugfs_devm_entry *entry = inode->i_private;
1108 :
1109 0 : return single_open(f, entry->read, entry->dev);
1110 : }
1111 :
1112 : static const struct file_operations debugfs_devm_entry_ops = {
1113 : .owner = THIS_MODULE,
1114 : .open = debugfs_devm_entry_open,
1115 : .release = single_release,
1116 : .read = seq_read,
1117 : .llseek = seq_lseek
1118 : };
1119 :
1120 : /**
1121 : * debugfs_create_devm_seqfile - create a debugfs file that is bound to device.
1122 : *
1123 : * @dev: device related to this debugfs file.
1124 : * @name: name of the debugfs file.
1125 : * @parent: a pointer to the parent dentry for this file. This should be a
1126 : * directory dentry if set. If this parameter is %NULL, then the
1127 : * file will be created in the root of the debugfs filesystem.
1128 : * @read_fn: function pointer called to print the seq_file content.
1129 : */
1130 0 : void debugfs_create_devm_seqfile(struct device *dev, const char *name,
1131 : struct dentry *parent,
1132 : int (*read_fn)(struct seq_file *s, void *data))
1133 : {
1134 0 : struct debugfs_devm_entry *entry;
1135 :
1136 0 : if (IS_ERR(parent))
1137 : return;
1138 :
1139 0 : entry = devm_kzalloc(dev, sizeof(*entry), GFP_KERNEL);
1140 0 : if (!entry)
1141 : return;
1142 :
1143 0 : entry->read = read_fn;
1144 0 : entry->dev = dev;
1145 :
1146 0 : debugfs_create_file(name, S_IRUGO, parent, entry,
1147 : &debugfs_devm_entry_ops);
1148 : }
1149 : EXPORT_SYMBOL_GPL(debugfs_create_devm_seqfile);
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