1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/queue.h>
32 #include <sys/blist.h>
33 #include <sys/conf.h>
34 #include <sys/exec.h>
35 #include <sys/filedesc.h>
36 #include <sys/kernel.h>
37 #include <sys/linker.h>
38 #include <sys/malloc.h>
39 #include <sys/mount.h>
40 #include <sys/mutex.h>
41 #include <sys/proc.h>
42 #include <sys/resourcevar.h>
43 #include <sys/sbuf.h>
44 #include <sys/smp.h>
45 #include <sys/socket.h>
46 #include <sys/vnode.h>
47 #include <sys/bus.h>
48 #include <sys/pciio.h>
49
50 #include <dev/pci/pcivar.h>
51 #include <dev/pci/pcireg.h>
52
53 #include <net/if.h>
54
55 #include <vm/vm.h>
56 #include <vm/pmap.h>
57 #include <vm/vm_map.h>
58 #include <vm/vm_param.h>
59 #include <vm/vm_object.h>
60 #include <vm/swap_pager.h>
61
62 #include <machine/bus.h>
63
64 #include <compat/linux/linux_ioctl.h>
65 #include <compat/linux/linux_mib.h>
66 #include <compat/linux/linux_util.h>
67 #include <fs/pseudofs/pseudofs.h>
68
69 #include <asm/atomic.h>
70 #include <linux/compat.h>
71 #include <linux/debugfs.h>
72 #include <linux/fs.h>
73
74 MALLOC_DEFINE(M_DFSINT, "debugfsint", "Linux debugfs internal");
75
76 static struct pfs_node *debugfs_root;
77
78 #define DM_SYMLINK 0x1
79 #define DM_DIR 0x2
80 #define DM_FILE 0x3
81
82 struct dentry_meta {
83 struct dentry dm_dnode;
84 const struct file_operations *dm_fops;
85 void *dm_data;
86 umode_t dm_mode;
87 int dm_type;
88 };
89
90 static int
debugfs_attr(PFS_ATTR_ARGS)91 debugfs_attr(PFS_ATTR_ARGS)
92 {
93 struct dentry_meta *dm;
94
95 dm = pn->pn_data;
96
97 vap->va_mode = dm->dm_mode;
98 return (0);
99 }
100
101 static int
debugfs_destroy(PFS_DESTROY_ARGS)102 debugfs_destroy(PFS_DESTROY_ARGS)
103 {
104 struct dentry_meta *dm;
105
106 dm = pn->pn_data;
107 if (dm->dm_type == DM_SYMLINK)
108 free(dm->dm_data, M_DFSINT);
109
110 free(dm, M_DFSINT);
111 return (0);
112 }
113
114 static int
debugfs_fill(PFS_FILL_ARGS)115 debugfs_fill(PFS_FILL_ARGS)
116 {
117 struct dentry_meta *d;
118 struct linux_file lf = {};
119 struct vnode vn;
120 char *buf;
121 int rc;
122 off_t off = 0;
123
124 if ((rc = linux_set_current_flags(curthread, M_NOWAIT)))
125 return (rc);
126
127 d = pn->pn_data;
128 vn.v_data = d->dm_data;
129
130 rc = d->dm_fops->open(&vn, &lf);
131 if (rc < 0) {
132 #ifdef INVARIANTS
133 printf("%s:%d open failed with %d\n", __FUNCTION__, __LINE__, rc);
134 #endif
135 return (-rc);
136 }
137
138 rc = -ENODEV;
139 switch (uio->uio_rw) {
140 case UIO_READ:
141 if (d->dm_fops->read != NULL) {
142 rc = -ENOMEM;
143 buf = malloc(sb->s_size, M_DFSINT, M_ZERO | M_NOWAIT);
144 if (buf != NULL) {
145 rc = d->dm_fops->read(&lf, buf, sb->s_size,
146 &off);
147 if (rc > 0)
148 sbuf_bcpy(sb, buf, strlen(buf));
149
150 free(buf, M_DFSINT);
151 }
152 }
153 break;
154 case UIO_WRITE:
155 if (d->dm_fops->write != NULL) {
156 sbuf_finish(sb);
157 rc = d->dm_fops->write(&lf, sbuf_data(sb), sbuf_len(sb),
158 &off);
159 }
160 break;
161 }
162
163 if (d->dm_fops->release)
164 d->dm_fops->release(&vn, &lf);
165 else
166 single_release(&vn, &lf);
167
168 if (rc < 0) {
169 #ifdef INVARIANTS
170 printf("%s:%d read/write failed with %d\n", __FUNCTION__, __LINE__, rc);
171 #endif
172 return (-rc);
173 }
174 return (0);
175 }
176
177 static int
debugfs_fill_data(PFS_FILL_ARGS)178 debugfs_fill_data(PFS_FILL_ARGS)
179 {
180 struct dentry_meta *dm;
181
182 dm = pn->pn_data;
183 sbuf_printf(sb, "%s", (char *)dm->dm_data);
184 return (0);
185 }
186
187 struct dentry *
debugfs_create_file(const char * name,umode_t mode,struct dentry * parent,void * data,const struct file_operations * fops)188 debugfs_create_file(const char *name, umode_t mode,
189 struct dentry *parent, void *data,
190 const struct file_operations *fops)
191 {
192 struct dentry_meta *dm;
193 struct dentry *dnode;
194 struct pfs_node *pnode;
195 int flags;
196
197 dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
198 if (dm == NULL)
199 return (NULL);
200 dnode = &dm->dm_dnode;
201 dm->dm_fops = fops;
202 dm->dm_data = data;
203 dm->dm_mode = mode;
204 dm->dm_type = DM_FILE;
205 if (parent != NULL)
206 pnode = parent->d_pfs_node;
207 else
208 pnode = debugfs_root;
209
210 flags = fops->write ? PFS_RDWR : PFS_RD;
211 dnode->d_pfs_node = pfs_create_file(pnode, name, debugfs_fill,
212 debugfs_attr, NULL, debugfs_destroy, flags | PFS_NOWAIT);
213 if (dnode->d_pfs_node == NULL) {
214 free(dm, M_DFSINT);
215 return (NULL);
216 }
217 dnode->d_pfs_node->pn_data = dm;
218
219 return (dnode);
220 }
221
222 struct dentry *
debugfs_create_file_size(const char * name,umode_t mode,struct dentry * parent,void * data,const struct file_operations * fops,loff_t file_size __unused)223 debugfs_create_file_size(const char *name, umode_t mode,
224 struct dentry *parent, void *data,
225 const struct file_operations *fops,
226 loff_t file_size __unused)
227 {
228
229 return debugfs_create_file(name, mode, parent, data, fops);
230 }
231
232 /*
233 * NOTE: Files created with the _unsafe moniker will not be protected from
234 * debugfs core file removals. It is the responsibility of @fops to protect
235 * its file using debugfs_file_get() and debugfs_file_put().
236 *
237 * FreeBSD's LinuxKPI lindebugfs does not perform file removals at the time
238 * of writing. Therefore there is no difference between functions with _unsafe
239 * and functions without _unsafe when using lindebugfs. Functions with _unsafe
240 * exist only for Linux compatibility.
241 */
242 struct dentry *
debugfs_create_file_unsafe(const char * name,umode_t mode,struct dentry * parent,void * data,const struct file_operations * fops)243 debugfs_create_file_unsafe(const char *name, umode_t mode,
244 struct dentry *parent, void *data,
245 const struct file_operations *fops)
246 {
247
248 return (debugfs_create_file(name, mode, parent, data, fops));
249 }
250
251 struct dentry *
debugfs_create_mode_unsafe(const char * name,umode_t mode,struct dentry * parent,void * data,const struct file_operations * fops,const struct file_operations * fops_ro,const struct file_operations * fops_wo)252 debugfs_create_mode_unsafe(const char *name, umode_t mode,
253 struct dentry *parent, void *data,
254 const struct file_operations *fops,
255 const struct file_operations *fops_ro,
256 const struct file_operations *fops_wo)
257 {
258 umode_t read = mode & S_IRUGO;
259 umode_t write = mode & S_IWUGO;
260
261 if (read && !write)
262 return (debugfs_create_file_unsafe(name, mode, parent, data, fops_ro));
263
264 if (write && !read)
265 return (debugfs_create_file_unsafe(name, mode, parent, data, fops_wo));
266
267 return (debugfs_create_file_unsafe(name, mode, parent, data, fops));
268 }
269
270 struct dentry *
debugfs_create_dir(const char * name,struct dentry * parent)271 debugfs_create_dir(const char *name, struct dentry *parent)
272 {
273 struct dentry_meta *dm;
274 struct dentry *dnode;
275 struct pfs_node *pnode;
276
277 dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
278 if (dm == NULL)
279 return (NULL);
280 dnode = &dm->dm_dnode;
281 dm->dm_mode = 0700;
282 dm->dm_type = DM_DIR;
283 if (parent != NULL)
284 pnode = parent->d_pfs_node;
285 else
286 pnode = debugfs_root;
287
288 dnode->d_pfs_node = pfs_create_dir(pnode, name, debugfs_attr, NULL, debugfs_destroy, PFS_RD | PFS_NOWAIT);
289 if (dnode->d_pfs_node == NULL) {
290 free(dm, M_DFSINT);
291 return (NULL);
292 }
293 dnode->d_pfs_node->pn_data = dm;
294 return (dnode);
295 }
296
297 struct dentry *
debugfs_create_symlink(const char * name,struct dentry * parent,const char * dest)298 debugfs_create_symlink(const char *name, struct dentry *parent,
299 const char *dest)
300 {
301 struct dentry_meta *dm;
302 struct dentry *dnode;
303 struct pfs_node *pnode;
304 void *data;
305
306 data = strdup_flags(dest, M_DFSINT, M_NOWAIT);
307 if (data == NULL)
308 return (NULL);
309 dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
310 if (dm == NULL)
311 goto fail1;
312 dnode = &dm->dm_dnode;
313 dm->dm_mode = 0700;
314 dm->dm_type = DM_SYMLINK;
315 dm->dm_data = data;
316 if (parent != NULL)
317 pnode = parent->d_pfs_node;
318 else
319 pnode = debugfs_root;
320
321 dnode->d_pfs_node = pfs_create_link(pnode, name, &debugfs_fill_data, NULL, NULL, NULL, PFS_NOWAIT);
322 if (dnode->d_pfs_node == NULL)
323 goto fail;
324 dnode->d_pfs_node->pn_data = dm;
325 return (dnode);
326 fail:
327 free(dm, M_DFSINT);
328 fail1:
329 free(data, M_DFSINT);
330 return (NULL);
331 }
332
333 void
debugfs_remove(struct dentry * dnode)334 debugfs_remove(struct dentry *dnode)
335 {
336 if (dnode == NULL)
337 return;
338
339 pfs_destroy(dnode->d_pfs_node);
340 }
341
342 void
debugfs_remove_recursive(struct dentry * dnode)343 debugfs_remove_recursive(struct dentry *dnode)
344 {
345 if (dnode == NULL)
346 return;
347
348 pfs_destroy(dnode->d_pfs_node);
349 }
350
351 static int
debugfs_bool_get(void * data,uint64_t * ullval)352 debugfs_bool_get(void *data, uint64_t *ullval)
353 {
354 bool *bval = data;
355
356 if (*bval)
357 *ullval = 1;
358 else
359 *ullval = 0;
360
361 return (0);
362 }
363
364 static int
debugfs_bool_set(void * data,uint64_t ullval)365 debugfs_bool_set(void *data, uint64_t ullval)
366 {
367 bool *bval = data;
368
369 if (ullval)
370 *bval = 1;
371 else
372 *bval = 0;
373
374 return (0);
375 }
376
377 DEFINE_DEBUGFS_ATTRIBUTE(fops_bool, debugfs_bool_get, debugfs_bool_set, "%llu\n");
378 DEFINE_DEBUGFS_ATTRIBUTE(fops_bool_ro, debugfs_bool_get, NULL, "%llu\n");
379 DEFINE_DEBUGFS_ATTRIBUTE(fops_bool_wo, NULL, debugfs_bool_set, "%llu\n");
380
381 void
debugfs_create_bool(const char * name,umode_t mode,struct dentry * parent,bool * value)382 debugfs_create_bool(const char *name, umode_t mode, struct dentry *parent, bool *value)
383 {
384
385 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_bool,
386 &fops_bool_ro, &fops_bool_wo);
387 }
388
389
390 static int
debugfs_u8_get(void * data,uint64_t * value)391 debugfs_u8_get(void *data, uint64_t *value)
392 {
393 uint8_t *u8data = data;
394 *value = *u8data;
395 return (0);
396 }
397
398 static int
debugfs_u8_set(void * data,uint64_t value)399 debugfs_u8_set(void *data, uint64_t value)
400 {
401 uint8_t *u8data = data;
402 *u8data = (uint8_t)value;
403 return (0);
404 }
405
406 DEFINE_DEBUGFS_ATTRIBUTE(fops_u8, debugfs_u8_get, debugfs_u8_set, "%u\n");
407 DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_ro, debugfs_u8_get, NULL, "%u\n");
408 DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_wo, NULL, debugfs_u8_set, "%u\n");
409
410 void
debugfs_create_u8(const char * name,umode_t mode,struct dentry * parent,uint8_t * value)411 debugfs_create_u8(const char *name, umode_t mode, struct dentry *parent, uint8_t *value)
412 {
413
414 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u8,
415 &fops_u8_ro, &fops_u8_wo);
416 }
417
418 DEFINE_DEBUGFS_ATTRIBUTE(fops_x8, debugfs_u8_get, debugfs_u8_set, "0x%016llx\n");
419 DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_ro, debugfs_u8_get, NULL, "0x%016llx\n");
420 DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_wo, NULL, debugfs_u8_set, "0x%016llx\n");
421
422 void
debugfs_create_x8(const char * name,umode_t mode,struct dentry * parent,uint8_t * value)423 debugfs_create_x8(const char *name, umode_t mode, struct dentry *parent, uint8_t *value)
424 {
425
426 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x8,
427 &fops_x8_ro, &fops_x8_wo);
428 }
429
430
431 static int
debugfs_u16_get(void * data,uint64_t * value)432 debugfs_u16_get(void *data, uint64_t *value)
433 {
434 uint16_t *u16data = data;
435 *value = *u16data;
436 return (0);
437 }
438
439 static int
debugfs_u16_set(void * data,uint64_t value)440 debugfs_u16_set(void *data, uint64_t value)
441 {
442 uint16_t *u16data = data;
443 *u16data = (uint16_t)value;
444 return (0);
445 }
446
447 DEFINE_DEBUGFS_ATTRIBUTE(fops_u16, debugfs_u16_get, debugfs_u16_set, "%u\n");
448 DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_ro, debugfs_u16_get, NULL, "%u\n");
449 DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_wo, NULL, debugfs_u16_set, "%u\n");
450
451 void
debugfs_create_u16(const char * name,umode_t mode,struct dentry * parent,uint16_t * value)452 debugfs_create_u16(const char *name, umode_t mode, struct dentry *parent, uint16_t *value)
453 {
454
455 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u16,
456 &fops_u16_ro, &fops_u16_wo);
457 }
458
459 DEFINE_DEBUGFS_ATTRIBUTE(fops_x16, debugfs_u16_get, debugfs_u16_set, "0x%016llx\n");
460 DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_ro, debugfs_u16_get, NULL, "0x%016llx\n");
461 DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_wo, NULL, debugfs_u16_set, "0x%016llx\n");
462
463 void
debugfs_create_x16(const char * name,umode_t mode,struct dentry * parent,uint16_t * value)464 debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent, uint16_t *value)
465 {
466
467 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x16,
468 &fops_x16_ro, &fops_x16_wo);
469 }
470
471
472 static int
debugfs_u32_get(void * data,uint64_t * value)473 debugfs_u32_get(void *data, uint64_t *value)
474 {
475 uint32_t *u32data = data;
476 *value = *u32data;
477 return (0);
478 }
479
480 static int
debugfs_u32_set(void * data,uint64_t value)481 debugfs_u32_set(void *data, uint64_t value)
482 {
483 uint32_t *u32data = data;
484 *u32data = (uint32_t)value;
485 return (0);
486 }
487
488 DEFINE_DEBUGFS_ATTRIBUTE(fops_u32, debugfs_u32_get, debugfs_u32_set, "%u\n");
489 DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_ro, debugfs_u32_get, NULL, "%u\n");
490 DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_wo, NULL, debugfs_u32_set, "%u\n");
491
492 void
debugfs_create_u32(const char * name,umode_t mode,struct dentry * parent,uint32_t * value)493 debugfs_create_u32(const char *name, umode_t mode, struct dentry *parent, uint32_t *value)
494 {
495
496 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u32,
497 &fops_u32_ro, &fops_u32_wo);
498 }
499
500 DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, debugfs_u32_get, debugfs_u32_set, "0x%016llx\n");
501 DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_ro, debugfs_u32_get, NULL, "0x%016llx\n");
502 DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_wo, NULL, debugfs_u32_set, "0x%016llx\n");
503
504 void
debugfs_create_x32(const char * name,umode_t mode,struct dentry * parent,uint32_t * value)505 debugfs_create_x32(const char *name, umode_t mode, struct dentry *parent, uint32_t *value)
506 {
507
508 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x32,
509 &fops_x32_ro, &fops_x32_wo);
510 }
511
512
513 static int
debugfs_u64_get(void * data,uint64_t * value)514 debugfs_u64_get(void *data, uint64_t *value)
515 {
516 uint64_t *u64data = data;
517 *value = *u64data;
518 return (0);
519 }
520
521 static int
debugfs_u64_set(void * data,uint64_t value)522 debugfs_u64_set(void *data, uint64_t value)
523 {
524 uint64_t *u64data = data;
525 *u64data = (uint64_t)value;
526 return (0);
527 }
528
529 DEFINE_DEBUGFS_ATTRIBUTE(fops_u64, debugfs_u64_get, debugfs_u64_set, "%u\n");
530 DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_ro, debugfs_u64_get, NULL, "%u\n");
531 DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%u\n");
532
533 void
debugfs_create_u64(const char * name,umode_t mode,struct dentry * parent,uint64_t * value)534 debugfs_create_u64(const char *name, umode_t mode, struct dentry *parent, uint64_t *value)
535 {
536
537 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u64,
538 &fops_u64_ro, &fops_u64_wo);
539 }
540
541 DEFINE_DEBUGFS_ATTRIBUTE(fops_x64, debugfs_u64_get, debugfs_u64_set, "0x%016llx\n");
542 DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_ro, debugfs_u64_get, NULL, "0x%016llx\n");
543 DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_wo, NULL, debugfs_u64_set, "0x%016llx\n");
544
545 void
debugfs_create_x64(const char * name,umode_t mode,struct dentry * parent,uint64_t * value)546 debugfs_create_x64(const char *name, umode_t mode, struct dentry *parent, uint64_t *value)
547 {
548
549 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x64,
550 &fops_x64_ro, &fops_x64_wo);
551 }
552
553
554 static int
debugfs_ulong_get(void * data,uint64_t * value)555 debugfs_ulong_get(void *data, uint64_t *value)
556 {
557 uint64_t *uldata = data;
558 *value = *uldata;
559 return (0);
560 }
561
562 static int
debugfs_ulong_set(void * data,uint64_t value)563 debugfs_ulong_set(void *data, uint64_t value)
564 {
565 uint64_t *uldata = data;
566 *uldata = value;
567 return (0);
568 }
569
570 DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong, debugfs_ulong_get, debugfs_ulong_set, "%llu\n");
571 DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_ro, debugfs_ulong_get, NULL, "%llu\n");
572 DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n");
573
574 void
debugfs_create_ulong(const char * name,umode_t mode,struct dentry * parent,unsigned long * value)575 debugfs_create_ulong(const char *name, umode_t mode, struct dentry *parent, unsigned long *value)
576 {
577
578 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_ulong,
579 &fops_ulong_ro, &fops_ulong_wo);
580 }
581
582
583 static int
debugfs_atomic_t_get(void * data,uint64_t * value)584 debugfs_atomic_t_get(void *data, uint64_t *value)
585 {
586 atomic_t *atomic_data = data;
587 *value = atomic_read(atomic_data);
588 return (0);
589 }
590
591 static int
debugfs_atomic_t_set(void * data,uint64_t value)592 debugfs_atomic_t_set(void *data, uint64_t value)
593 {
594 atomic_t *atomic_data = data;
595 atomic_set(atomic_data, (int)value);
596 return (0);
597 }
598
599 DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get, debugfs_atomic_t_set, "%d\n");
600 DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_ro, debugfs_atomic_t_get, NULL, "%d\n");
601 DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set, "%d\n");
602
603 void
debugfs_create_atomic_t(const char * name,umode_t mode,struct dentry * parent,atomic_t * value)604 debugfs_create_atomic_t(const char *name, umode_t mode, struct dentry *parent, atomic_t *value)
605 {
606
607 debugfs_create_mode_unsafe(name, mode, parent, value, &fops_atomic_t,
608 &fops_atomic_t_ro, &fops_atomic_t_wo);
609 }
610
611
612 static ssize_t
fops_blob_read(struct file * filp,char __user * ubuf,size_t read_size,loff_t * ppos)613 fops_blob_read(struct file *filp, char __user *ubuf, size_t read_size, loff_t *ppos)
614 {
615 struct debugfs_blob_wrapper *blob;
616
617 blob = filp->private_data;
618 if (blob == NULL)
619 return (-EINVAL);
620 if (blob->size == 0 || blob->data == NULL)
621 return (-EINVAL);
622
623 return (simple_read_from_buffer(ubuf, read_size, ppos, blob->data, blob->size));
624 }
625
626 static int
fops_blob_open(struct inode * inode,struct file * filp)627 fops_blob_open(struct inode *inode, struct file *filp)
628 {
629
630 return (simple_open(inode, filp));
631 }
632
633 static const struct file_operations __fops_blob_ro = {
634 .owner = THIS_MODULE,
635 .open = fops_blob_open,
636 .read = fops_blob_read,
637 .llseek = no_llseek
638 };
639
640 struct dentry *
debugfs_create_blob(const char * name,umode_t mode,struct dentry * parent,struct debugfs_blob_wrapper * value)641 debugfs_create_blob(const char *name, umode_t mode, struct dentry *parent,
642 struct debugfs_blob_wrapper *value)
643 {
644 /* Blobs are read-only. */
645 return (debugfs_create_file(name, mode & 0444, parent, value, &__fops_blob_ro));
646 }
647
648
649 static int
lindebugfs_init(PFS_INIT_ARGS)650 lindebugfs_init(PFS_INIT_ARGS)
651 {
652
653 debugfs_root = pi->pi_root;
654
655 (void)debugfs_create_symlink("kcov", NULL, "/dev/kcov");
656
657 return (0);
658 }
659
660 static int
lindebugfs_uninit(PFS_INIT_ARGS)661 lindebugfs_uninit(PFS_INIT_ARGS)
662 {
663
664 return (0);
665 }
666
667 PSEUDOFS(lindebugfs, 1, VFCF_JAIL);
668 MODULE_DEPEND(lindebugfs, linuxkpi, 1, 1, 1);
669