1
2
3
4
5#include <linux/debugfs.h>
6#include <linux/dma-mapping.h>
7#include <linux/slab.h>
8#include <linux/uaccess.h>
9
10#include <soc/tegra/bpmp.h>
11#include <soc/tegra/bpmp-abi.h>
12
13static DEFINE_MUTEX(bpmp_debug_lock);
14
15struct seqbuf {
16 char *buf;
17 size_t pos;
18 size_t size;
19};
20
21static void seqbuf_init(struct seqbuf *seqbuf, void *buf, size_t size)
22{
23 seqbuf->buf = buf;
24 seqbuf->size = size;
25 seqbuf->pos = 0;
26}
27
28static size_t seqbuf_avail(struct seqbuf *seqbuf)
29{
30 return seqbuf->pos < seqbuf->size ? seqbuf->size - seqbuf->pos : 0;
31}
32
33static size_t seqbuf_status(struct seqbuf *seqbuf)
34{
35 return seqbuf->pos <= seqbuf->size ? 0 : -EOVERFLOW;
36}
37
38static int seqbuf_eof(struct seqbuf *seqbuf)
39{
40 return seqbuf->pos >= seqbuf->size;
41}
42
43static int seqbuf_read(struct seqbuf *seqbuf, void *buf, size_t nbyte)
44{
45 nbyte = min(nbyte, seqbuf_avail(seqbuf));
46 memcpy(buf, seqbuf->buf + seqbuf->pos, nbyte);
47 seqbuf->pos += nbyte;
48 return seqbuf_status(seqbuf);
49}
50
51static int seqbuf_read_u32(struct seqbuf *seqbuf, uint32_t *v)
52{
53 int err;
54
55 err = seqbuf_read(seqbuf, v, 4);
56 *v = le32_to_cpu(*v);
57 return err;
58}
59
60static int seqbuf_read_str(struct seqbuf *seqbuf, const char **str)
61{
62 *str = seqbuf->buf + seqbuf->pos;
63 seqbuf->pos += strnlen(*str, seqbuf_avail(seqbuf));
64 seqbuf->pos++;
65 return seqbuf_status(seqbuf);
66}
67
68static void seqbuf_seek(struct seqbuf *seqbuf, ssize_t offset)
69{
70 seqbuf->pos += offset;
71}
72
73
74static const char *get_filename(struct tegra_bpmp *bpmp,
75 const struct file *file, char *buf, int size)
76{
77 char root_path_buf[512];
78 const char *root_path;
79 const char *filename;
80 size_t root_len;
81
82 root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
83 sizeof(root_path_buf));
84 if (IS_ERR(root_path))
85 return NULL;
86
87 root_len = strlen(root_path);
88
89 filename = dentry_path(file->f_path.dentry, buf, size);
90 if (IS_ERR(filename))
91 return NULL;
92
93 if (strlen(filename) < root_len ||
94 strncmp(filename, root_path, root_len))
95 return NULL;
96
97 filename += root_len;
98
99 return filename;
100}
101
102static int mrq_debug_open(struct tegra_bpmp *bpmp, const char *name,
103 uint32_t *fd, uint32_t *len, bool write)
104{
105 struct mrq_debug_request req = {
106 .cmd = cpu_to_le32(write ? CMD_DEBUG_OPEN_WO : CMD_DEBUG_OPEN_RO),
107 };
108 struct mrq_debug_response resp;
109 struct tegra_bpmp_message msg = {
110 .mrq = MRQ_DEBUG,
111 .tx = {
112 .data = &req,
113 .size = sizeof(req),
114 },
115 .rx = {
116 .data = &resp,
117 .size = sizeof(resp),
118 },
119 };
120 ssize_t sz_name;
121 int err = 0;
122
123 sz_name = strscpy(req.fop.name, name, sizeof(req.fop.name));
124 if (sz_name < 0) {
125 pr_err("File name too large: %s\n", name);
126 return -EINVAL;
127 }
128
129 err = tegra_bpmp_transfer(bpmp, &msg);
130 if (err < 0)
131 return err;
132 else if (msg.rx.ret < 0)
133 return -EINVAL;
134
135 *len = resp.fop.datalen;
136 *fd = resp.fop.fd;
137
138 return 0;
139}
140
141static int mrq_debug_close(struct tegra_bpmp *bpmp, uint32_t fd)
142{
143 struct mrq_debug_request req = {
144 .cmd = cpu_to_le32(CMD_DEBUG_CLOSE),
145 .frd = {
146 .fd = fd,
147 },
148 };
149 struct mrq_debug_response resp;
150 struct tegra_bpmp_message msg = {
151 .mrq = MRQ_DEBUG,
152 .tx = {
153 .data = &req,
154 .size = sizeof(req),
155 },
156 .rx = {
157 .data = &resp,
158 .size = sizeof(resp),
159 },
160 };
161 int err = 0;
162
163 err = tegra_bpmp_transfer(bpmp, &msg);
164 if (err < 0)
165 return err;
166 else if (msg.rx.ret < 0)
167 return -EINVAL;
168
169 return 0;
170}
171
172static int mrq_debug_read(struct tegra_bpmp *bpmp, const char *name,
173 char *data, size_t sz_data, uint32_t *nbytes)
174{
175 struct mrq_debug_request req = {
176 .cmd = cpu_to_le32(CMD_DEBUG_READ),
177 };
178 struct mrq_debug_response resp;
179 struct tegra_bpmp_message msg = {
180 .mrq = MRQ_DEBUG,
181 .tx = {
182 .data = &req,
183 .size = sizeof(req),
184 },
185 .rx = {
186 .data = &resp,
187 .size = sizeof(resp),
188 },
189 };
190 uint32_t fd = 0, len = 0;
191 int remaining, err;
192
193 mutex_lock(&bpmp_debug_lock);
194 err = mrq_debug_open(bpmp, name, &fd, &len, 0);
195 if (err)
196 goto out;
197
198 if (len > sz_data) {
199 err = -EFBIG;
200 goto close;
201 }
202
203 req.frd.fd = fd;
204 remaining = len;
205
206 while (remaining > 0) {
207 err = tegra_bpmp_transfer(bpmp, &msg);
208 if (err < 0) {
209 goto close;
210 } else if (msg.rx.ret < 0) {
211 err = -EINVAL;
212 goto close;
213 }
214
215 if (resp.frd.readlen > remaining) {
216 pr_err("%s: read data length invalid\n", __func__);
217 err = -EINVAL;
218 goto close;
219 }
220
221 memcpy(data, resp.frd.data, resp.frd.readlen);
222 data += resp.frd.readlen;
223 remaining -= resp.frd.readlen;
224 }
225
226 *nbytes = len;
227
228close:
229 err = mrq_debug_close(bpmp, fd);
230out:
231 mutex_unlock(&bpmp_debug_lock);
232 return err;
233}
234
235static int mrq_debug_write(struct tegra_bpmp *bpmp, const char *name,
236 uint8_t *data, size_t sz_data)
237{
238 struct mrq_debug_request req = {
239 .cmd = cpu_to_le32(CMD_DEBUG_WRITE)
240 };
241 struct mrq_debug_response resp;
242 struct tegra_bpmp_message msg = {
243 .mrq = MRQ_DEBUG,
244 .tx = {
245 .data = &req,
246 .size = sizeof(req),
247 },
248 .rx = {
249 .data = &resp,
250 .size = sizeof(resp),
251 },
252 };
253 uint32_t fd = 0, len = 0;
254 size_t remaining;
255 int err;
256
257 mutex_lock(&bpmp_debug_lock);
258 err = mrq_debug_open(bpmp, name, &fd, &len, 1);
259 if (err)
260 goto out;
261
262 if (sz_data > len) {
263 err = -EINVAL;
264 goto close;
265 }
266
267 req.fwr.fd = fd;
268 remaining = sz_data;
269
270 while (remaining > 0) {
271 len = min(remaining, sizeof(req.fwr.data));
272 memcpy(req.fwr.data, data, len);
273 req.fwr.datalen = len;
274
275 err = tegra_bpmp_transfer(bpmp, &msg);
276 if (err < 0) {
277 goto close;
278 } else if (msg.rx.ret < 0) {
279 err = -EINVAL;
280 goto close;
281 }
282
283 data += req.fwr.datalen;
284 remaining -= req.fwr.datalen;
285 }
286
287close:
288 err = mrq_debug_close(bpmp, fd);
289out:
290 mutex_unlock(&bpmp_debug_lock);
291 return err;
292}
293
294static int bpmp_debug_show(struct seq_file *m, void *p)
295{
296 struct file *file = m->private;
297 struct inode *inode = file_inode(file);
298 struct tegra_bpmp *bpmp = inode->i_private;
299 char *databuf = NULL;
300 char fnamebuf[256];
301 const char *filename;
302 uint32_t nbytes = 0;
303 size_t len;
304 int err;
305
306 len = seq_get_buf(m, &databuf);
307 if (!databuf)
308 return -ENOMEM;
309
310 filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
311 if (!filename)
312 return -ENOENT;
313
314 err = mrq_debug_read(bpmp, filename, databuf, len, &nbytes);
315 if (!err)
316 seq_commit(m, nbytes);
317
318 return err;
319}
320
321static ssize_t bpmp_debug_store(struct file *file, const char __user *buf,
322 size_t count, loff_t *f_pos)
323{
324 struct inode *inode = file_inode(file);
325 struct tegra_bpmp *bpmp = inode->i_private;
326 char *databuf = NULL;
327 char fnamebuf[256];
328 const char *filename;
329 ssize_t err;
330
331 filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
332 if (!filename)
333 return -ENOENT;
334
335 databuf = kmalloc(count, GFP_KERNEL);
336 if (!databuf)
337 return -ENOMEM;
338
339 if (copy_from_user(databuf, buf, count)) {
340 err = -EFAULT;
341 goto free_ret;
342 }
343
344 err = mrq_debug_write(bpmp, filename, databuf, count);
345
346free_ret:
347 kfree(databuf);
348
349 return err ?: count;
350}
351
352static int bpmp_debug_open(struct inode *inode, struct file *file)
353{
354 return single_open_size(file, bpmp_debug_show, file, SZ_256K);
355}
356
357static const struct file_operations bpmp_debug_fops = {
358 .open = bpmp_debug_open,
359 .read = seq_read,
360 .llseek = seq_lseek,
361 .write = bpmp_debug_store,
362 .release = single_release,
363};
364
365static int bpmp_populate_debugfs_inband(struct tegra_bpmp *bpmp,
366 struct dentry *parent,
367 char *ppath)
368{
369 const size_t pathlen = SZ_256;
370 const size_t bufsize = SZ_16K;
371 uint32_t dsize, attrs = 0;
372 struct dentry *dentry;
373 struct seqbuf seqbuf;
374 char *buf, *pathbuf;
375 const char *name;
376 int err = 0;
377
378 if (!bpmp || !parent || !ppath)
379 return -EINVAL;
380
381 buf = kmalloc(bufsize, GFP_KERNEL);
382 if (!buf)
383 return -ENOMEM;
384
385 pathbuf = kzalloc(pathlen, GFP_KERNEL);
386 if (!pathbuf) {
387 kfree(buf);
388 return -ENOMEM;
389 }
390
391 err = mrq_debug_read(bpmp, ppath, buf, bufsize, &dsize);
392 if (err)
393 goto out;
394
395 seqbuf_init(&seqbuf, buf, dsize);
396
397 while (!seqbuf_eof(&seqbuf)) {
398 err = seqbuf_read_u32(&seqbuf, &attrs);
399 if (err)
400 goto out;
401
402 err = seqbuf_read_str(&seqbuf, &name);
403 if (err < 0)
404 goto out;
405
406 if (attrs & DEBUGFS_S_ISDIR) {
407 size_t len;
408
409 dentry = debugfs_create_dir(name, parent);
410 if (IS_ERR(dentry)) {
411 err = PTR_ERR(dentry);
412 goto out;
413 }
414
415 len = strlen(ppath) + strlen(name) + 1;
416 if (len >= pathlen) {
417 err = -EINVAL;
418 goto out;
419 }
420
421 strncpy(pathbuf, ppath, pathlen);
422 strncat(pathbuf, name, strlen(name));
423 strcat(pathbuf, "/");
424
425 err = bpmp_populate_debugfs_inband(bpmp, dentry,
426 pathbuf);
427 if (err < 0)
428 goto out;
429 } else {
430 umode_t mode;
431
432 mode = attrs & DEBUGFS_S_IRUSR ? 0400 : 0;
433 mode |= attrs & DEBUGFS_S_IWUSR ? 0200 : 0;
434 dentry = debugfs_create_file(name, mode, parent, bpmp,
435 &bpmp_debug_fops);
436 if (!dentry) {
437 err = -ENOMEM;
438 goto out;
439 }
440 }
441 }
442
443out:
444 kfree(pathbuf);
445 kfree(buf);
446
447 return err;
448}
449
450static int mrq_debugfs_read(struct tegra_bpmp *bpmp,
451 dma_addr_t name, size_t sz_name,
452 dma_addr_t data, size_t sz_data,
453 size_t *nbytes)
454{
455 struct mrq_debugfs_request req = {
456 .cmd = cpu_to_le32(CMD_DEBUGFS_READ),
457 .fop = {
458 .fnameaddr = cpu_to_le32((uint32_t)name),
459 .fnamelen = cpu_to_le32((uint32_t)sz_name),
460 .dataaddr = cpu_to_le32((uint32_t)data),
461 .datalen = cpu_to_le32((uint32_t)sz_data),
462 },
463 };
464 struct mrq_debugfs_response resp;
465 struct tegra_bpmp_message msg = {
466 .mrq = MRQ_DEBUGFS,
467 .tx = {
468 .data = &req,
469 .size = sizeof(req),
470 },
471 .rx = {
472 .data = &resp,
473 .size = sizeof(resp),
474 },
475 };
476 int err;
477
478 err = tegra_bpmp_transfer(bpmp, &msg);
479 if (err < 0)
480 return err;
481 else if (msg.rx.ret < 0)
482 return -EINVAL;
483
484 *nbytes = (size_t)resp.fop.nbytes;
485
486 return 0;
487}
488
489static int mrq_debugfs_write(struct tegra_bpmp *bpmp,
490 dma_addr_t name, size_t sz_name,
491 dma_addr_t data, size_t sz_data)
492{
493 const struct mrq_debugfs_request req = {
494 .cmd = cpu_to_le32(CMD_DEBUGFS_WRITE),
495 .fop = {
496 .fnameaddr = cpu_to_le32((uint32_t)name),
497 .fnamelen = cpu_to_le32((uint32_t)sz_name),
498 .dataaddr = cpu_to_le32((uint32_t)data),
499 .datalen = cpu_to_le32((uint32_t)sz_data),
500 },
501 };
502 struct tegra_bpmp_message msg = {
503 .mrq = MRQ_DEBUGFS,
504 .tx = {
505 .data = &req,
506 .size = sizeof(req),
507 },
508 };
509
510 return tegra_bpmp_transfer(bpmp, &msg);
511}
512
513static int mrq_debugfs_dumpdir(struct tegra_bpmp *bpmp, dma_addr_t addr,
514 size_t size, size_t *nbytes)
515{
516 const struct mrq_debugfs_request req = {
517 .cmd = cpu_to_le32(CMD_DEBUGFS_DUMPDIR),
518 .dumpdir = {
519 .dataaddr = cpu_to_le32((uint32_t)addr),
520 .datalen = cpu_to_le32((uint32_t)size),
521 },
522 };
523 struct mrq_debugfs_response resp;
524 struct tegra_bpmp_message msg = {
525 .mrq = MRQ_DEBUGFS,
526 .tx = {
527 .data = &req,
528 .size = sizeof(req),
529 },
530 .rx = {
531 .data = &resp,
532 .size = sizeof(resp),
533 },
534 };
535 int err;
536
537 err = tegra_bpmp_transfer(bpmp, &msg);
538 if (err < 0)
539 return err;
540 else if (msg.rx.ret < 0)
541 return -EINVAL;
542
543 *nbytes = (size_t)resp.dumpdir.nbytes;
544
545 return 0;
546}
547
548static int debugfs_show(struct seq_file *m, void *p)
549{
550 struct file *file = m->private;
551 struct inode *inode = file_inode(file);
552 struct tegra_bpmp *bpmp = inode->i_private;
553 const size_t datasize = m->size;
554 const size_t namesize = SZ_256;
555 void *datavirt, *namevirt;
556 dma_addr_t dataphys, namephys;
557 char buf[256];
558 const char *filename;
559 size_t len, nbytes;
560 int err;
561
562 filename = get_filename(bpmp, file, buf, sizeof(buf));
563 if (!filename)
564 return -ENOENT;
565
566 namevirt = dma_alloc_coherent(bpmp->dev, namesize, &namephys,
567 GFP_KERNEL | GFP_DMA32);
568 if (!namevirt)
569 return -ENOMEM;
570
571 datavirt = dma_alloc_coherent(bpmp->dev, datasize, &dataphys,
572 GFP_KERNEL | GFP_DMA32);
573 if (!datavirt) {
574 err = -ENOMEM;
575 goto free_namebuf;
576 }
577
578 len = strlen(filename);
579 strncpy(namevirt, filename, namesize);
580
581 err = mrq_debugfs_read(bpmp, namephys, len, dataphys, datasize,
582 &nbytes);
583
584 if (!err)
585 seq_write(m, datavirt, nbytes);
586
587 dma_free_coherent(bpmp->dev, datasize, datavirt, dataphys);
588free_namebuf:
589 dma_free_coherent(bpmp->dev, namesize, namevirt, namephys);
590
591 return err;
592}
593
594static int debugfs_open(struct inode *inode, struct file *file)
595{
596 return single_open_size(file, debugfs_show, file, SZ_128K);
597}
598
599static ssize_t debugfs_store(struct file *file, const char __user *buf,
600 size_t count, loff_t *f_pos)
601{
602 struct inode *inode = file_inode(file);
603 struct tegra_bpmp *bpmp = inode->i_private;
604 const size_t datasize = count;
605 const size_t namesize = SZ_256;
606 void *datavirt, *namevirt;
607 dma_addr_t dataphys, namephys;
608 char fnamebuf[256];
609 const char *filename;
610 size_t len;
611 int err;
612
613 filename = get_filename(bpmp, file, fnamebuf, sizeof(fnamebuf));
614 if (!filename)
615 return -ENOENT;
616
617 namevirt = dma_alloc_coherent(bpmp->dev, namesize, &namephys,
618 GFP_KERNEL | GFP_DMA32);
619 if (!namevirt)
620 return -ENOMEM;
621
622 datavirt = dma_alloc_coherent(bpmp->dev, datasize, &dataphys,
623 GFP_KERNEL | GFP_DMA32);
624 if (!datavirt) {
625 err = -ENOMEM;
626 goto free_namebuf;
627 }
628
629 len = strlen(filename);
630 strncpy(namevirt, filename, namesize);
631
632 if (copy_from_user(datavirt, buf, count)) {
633 err = -EFAULT;
634 goto free_databuf;
635 }
636
637 err = mrq_debugfs_write(bpmp, namephys, len, dataphys,
638 count);
639
640free_databuf:
641 dma_free_coherent(bpmp->dev, datasize, datavirt, dataphys);
642free_namebuf:
643 dma_free_coherent(bpmp->dev, namesize, namevirt, namephys);
644
645 return err ?: count;
646}
647
648static const struct file_operations debugfs_fops = {
649 .open = debugfs_open,
650 .read = seq_read,
651 .llseek = seq_lseek,
652 .write = debugfs_store,
653 .release = single_release,
654};
655
656static int bpmp_populate_dir(struct tegra_bpmp *bpmp, struct seqbuf *seqbuf,
657 struct dentry *parent, uint32_t depth)
658{
659 int err;
660 uint32_t d, t;
661 const char *name;
662 struct dentry *dentry;
663
664 while (!seqbuf_eof(seqbuf)) {
665 err = seqbuf_read_u32(seqbuf, &d);
666 if (err < 0)
667 return err;
668
669 if (d < depth) {
670 seqbuf_seek(seqbuf, -4);
671
672 return 0;
673 } else if (d != depth) {
674
675 return -EIO;
676 }
677
678 err = seqbuf_read_u32(seqbuf, &t);
679 if (err < 0)
680 return err;
681 err = seqbuf_read_str(seqbuf, &name);
682 if (err < 0)
683 return err;
684
685 if (t & DEBUGFS_S_ISDIR) {
686 dentry = debugfs_create_dir(name, parent);
687 if (!dentry)
688 return -ENOMEM;
689 err = bpmp_populate_dir(bpmp, seqbuf, dentry, depth+1);
690 if (err < 0)
691 return err;
692 } else {
693 umode_t mode;
694
695 mode = t & DEBUGFS_S_IRUSR ? S_IRUSR : 0;
696 mode |= t & DEBUGFS_S_IWUSR ? S_IWUSR : 0;
697 dentry = debugfs_create_file(name, mode,
698 parent, bpmp,
699 &debugfs_fops);
700 if (!dentry)
701 return -ENOMEM;
702 }
703 }
704
705 return 0;
706}
707
708static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp)
709{
710 struct seqbuf seqbuf;
711 const size_t sz = SZ_512K;
712 dma_addr_t phys;
713 size_t nbytes;
714 void *virt;
715 int err;
716
717 virt = dma_alloc_coherent(bpmp->dev, sz, &phys,
718 GFP_KERNEL | GFP_DMA32);
719 if (!virt)
720 return -ENOMEM;
721
722 err = mrq_debugfs_dumpdir(bpmp, phys, sz, &nbytes);
723 if (err < 0) {
724 goto free;
725 } else if (nbytes > sz) {
726 err = -EINVAL;
727 goto free;
728 }
729
730 seqbuf_init(&seqbuf, virt, nbytes);
731 err = bpmp_populate_dir(bpmp, &seqbuf, bpmp->debugfs_mirror, 0);
732free:
733 dma_free_coherent(bpmp->dev, sz, virt, phys);
734
735 return err;
736}
737
738int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
739{
740 struct dentry *root;
741 bool inband;
742 int err;
743
744 inband = tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUG);
745
746 if (!inband && !tegra_bpmp_mrq_is_supported(bpmp, MRQ_DEBUGFS))
747 return 0;
748
749 root = debugfs_create_dir("bpmp", NULL);
750 if (!root)
751 return -ENOMEM;
752
753 bpmp->debugfs_mirror = debugfs_create_dir("debug", root);
754 if (!bpmp->debugfs_mirror) {
755 err = -ENOMEM;
756 goto out;
757 }
758
759 if (inband)
760 err = bpmp_populate_debugfs_inband(bpmp, bpmp->debugfs_mirror,
761 "/");
762 else
763 err = bpmp_populate_debugfs_shmem(bpmp);
764
765out:
766 if (err < 0)
767 debugfs_remove_recursive(root);
768
769 return err;
770}
771
