1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * UHCI-specific debugging code. Invaluable when something
4 * goes wrong, but don't get in my face.
5 *
6 * Kernel visible pointers are surrounded in []s and bus
7 * visible pointers are surrounded in ()s
8 *
9 * (C) Copyright 1999 Linus Torvalds
10 * (C) Copyright 1999-2001 Johannes Erdfelt
11 */
12
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/debugfs.h>
16 #include <asm/io.h>
17
18 #include "uhci-hcd.h"
19
20 #define EXTRA_SPACE 1024
21
22 static struct dentry *uhci_debugfs_root;
23
24 #ifdef CONFIG_DYNAMIC_DEBUG
25
26 /* Handle REALLY large printks so we don't overflow buffers */
lprintk(char * buf)27 static void lprintk(char *buf)
28 {
29 char *p;
30
31 /* Just write one line at a time */
32 while (buf) {
33 p = strchr(buf, '\n');
34 if (p)
35 *p = 0;
36 printk(KERN_DEBUG "%s\n", buf);
37 buf = p;
38 if (buf)
39 buf++;
40 }
41 }
42
uhci_show_td(struct uhci_hcd * uhci,struct uhci_td * td,char * buf,int len,int space)43 static int uhci_show_td(struct uhci_hcd *uhci, struct uhci_td *td, char *buf,
44 int len, int space)
45 {
46 char *out = buf;
47 char *spid;
48 u32 status, token;
49
50 status = td_status(uhci, td);
51 out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td,
52 hc32_to_cpu(uhci, td->link));
53 out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
54 ((status >> 27) & 3),
55 (status & TD_CTRL_SPD) ? "SPD " : "",
56 (status & TD_CTRL_LS) ? "LS " : "",
57 (status & TD_CTRL_IOC) ? "IOC " : "",
58 (status & TD_CTRL_ACTIVE) ? "Active " : "",
59 (status & TD_CTRL_STALLED) ? "Stalled " : "",
60 (status & TD_CTRL_DBUFERR) ? "DataBufErr " : "",
61 (status & TD_CTRL_BABBLE) ? "Babble " : "",
62 (status & TD_CTRL_NAK) ? "NAK " : "",
63 (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
64 (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
65 status & 0x7ff);
66 if (out - buf > len)
67 goto done;
68
69 token = td_token(uhci, td);
70 switch (uhci_packetid(token)) {
71 case USB_PID_SETUP:
72 spid = "SETUP";
73 break;
74 case USB_PID_OUT:
75 spid = "OUT";
76 break;
77 case USB_PID_IN:
78 spid = "IN";
79 break;
80 default:
81 spid = "?";
82 break;
83 }
84
85 out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
86 token >> 21,
87 ((token >> 19) & 1),
88 (token >> 15) & 15,
89 (token >> 8) & 127,
90 (token & 0xff),
91 spid);
92 out += sprintf(out, "(buf=%08x)\n", hc32_to_cpu(uhci, td->buffer));
93
94 done:
95 if (out - buf > len)
96 out += sprintf(out, " ...\n");
97 return out - buf;
98 }
99
uhci_show_urbp(struct uhci_hcd * uhci,struct urb_priv * urbp,char * buf,int len,int space)100 static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp,
101 char *buf, int len, int space)
102 {
103 char *out = buf;
104 struct uhci_td *td;
105 int i, nactive, ninactive;
106 char *ptype;
107
108
109 out += sprintf(out, "urb_priv [%p] ", urbp);
110 out += sprintf(out, "urb [%p] ", urbp->urb);
111 out += sprintf(out, "qh [%p] ", urbp->qh);
112 out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
113 out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
114 (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
115 if (out - buf > len)
116 goto done;
117
118 switch (usb_pipetype(urbp->urb->pipe)) {
119 case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
120 case PIPE_INTERRUPT: ptype = "INT"; break;
121 case PIPE_BULK: ptype = "BLK"; break;
122 default:
123 case PIPE_CONTROL: ptype = "CTL"; break;
124 }
125
126 out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
127 out += sprintf(out, " Actlen=%d%s", urbp->urb->actual_length,
128 (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ?
129 "-8" : ""));
130
131 if (urbp->urb->unlinked)
132 out += sprintf(out, " Unlinked=%d", urbp->urb->unlinked);
133 out += sprintf(out, "\n");
134
135 if (out - buf > len)
136 goto done;
137
138 i = nactive = ninactive = 0;
139 list_for_each_entry(td, &urbp->td_list, list) {
140 if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC &&
141 (++i <= 10 || debug > 2)) {
142 out += sprintf(out, "%*s%d: ", space + 2, "", i);
143 out += uhci_show_td(uhci, td, out,
144 len - (out - buf), 0);
145 if (out - buf > len)
146 goto tail;
147 } else {
148 if (td_status(uhci, td) & TD_CTRL_ACTIVE)
149 ++nactive;
150 else
151 ++ninactive;
152 }
153 }
154 if (nactive + ninactive > 0)
155 out += sprintf(out,
156 "%*s[skipped %d inactive and %d active TDs]\n",
157 space, "", ninactive, nactive);
158 done:
159 if (out - buf > len)
160 out += sprintf(out, " ...\n");
161 tail:
162 return out - buf;
163 }
164
uhci_show_qh(struct uhci_hcd * uhci,struct uhci_qh * qh,char * buf,int len,int space)165 static int uhci_show_qh(struct uhci_hcd *uhci,
166 struct uhci_qh *qh, char *buf, int len, int space)
167 {
168 char *out = buf;
169 int i, nurbs;
170 __hc32 element = qh_element(qh);
171 char *qtype;
172
173 switch (qh->type) {
174 case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
175 case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
176 case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
177 case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
178 default: qtype = "Skel" ; break;
179 }
180
181 out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
182 space, "", qh, qtype,
183 hc32_to_cpu(uhci, qh->link),
184 hc32_to_cpu(uhci, element));
185 if (qh->type == USB_ENDPOINT_XFER_ISOC)
186 out += sprintf(out,
187 "%*s period %d phase %d load %d us, frame %x desc [%p]\n",
188 space, "", qh->period, qh->phase, qh->load,
189 qh->iso_frame, qh->iso_packet_desc);
190 else if (qh->type == USB_ENDPOINT_XFER_INT)
191 out += sprintf(out, "%*s period %d phase %d load %d us\n",
192 space, "", qh->period, qh->phase, qh->load);
193 if (out - buf > len)
194 goto done;
195
196 if (element & UHCI_PTR_QH(uhci))
197 out += sprintf(out, "%*s Element points to QH (bug?)\n", space, "");
198
199 if (element & UHCI_PTR_DEPTH(uhci))
200 out += sprintf(out, "%*s Depth traverse\n", space, "");
201
202 if (element & cpu_to_hc32(uhci, 8))
203 out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, "");
204
205 if (!(element & ~(UHCI_PTR_QH(uhci) | UHCI_PTR_DEPTH(uhci))))
206 out += sprintf(out, "%*s Element is NULL (bug?)\n", space, "");
207
208 if (out - buf > len)
209 goto done;
210
211 if (list_empty(&qh->queue)) {
212 out += sprintf(out, "%*s queue is empty\n", space, "");
213 if (qh == uhci->skel_async_qh) {
214 out += uhci_show_td(uhci, uhci->term_td, out,
215 len - (out - buf), 0);
216 if (out - buf > len)
217 goto tail;
218 }
219 } else {
220 struct urb_priv *urbp = list_entry(qh->queue.next,
221 struct urb_priv, node);
222 struct uhci_td *td = list_entry(urbp->td_list.next,
223 struct uhci_td, list);
224
225 if (element != LINK_TO_TD(uhci, td))
226 out += sprintf(out, "%*s Element != First TD\n",
227 space, "");
228 i = nurbs = 0;
229 list_for_each_entry(urbp, &qh->queue, node) {
230 if (++i <= 10) {
231 out += uhci_show_urbp(uhci, urbp, out,
232 len - (out - buf), space + 2);
233 if (out - buf > len)
234 goto tail;
235 }
236 else
237 ++nurbs;
238 }
239 if (nurbs > 0)
240 out += sprintf(out, "%*s Skipped %d URBs\n",
241 space, "", nurbs);
242 }
243
244 if (out - buf > len)
245 goto done;
246
247 if (qh->dummy_td) {
248 out += sprintf(out, "%*s Dummy TD\n", space, "");
249 out += uhci_show_td(uhci, qh->dummy_td, out,
250 len - (out - buf), 0);
251 if (out - buf > len)
252 goto tail;
253 }
254
255 done:
256 if (out - buf > len)
257 out += sprintf(out, " ...\n");
258 tail:
259 return out - buf;
260 }
261
uhci_show_sc(int port,unsigned short status,char * buf)262 static int uhci_show_sc(int port, unsigned short status, char *buf)
263 {
264 return sprintf(buf, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n",
265 port,
266 status,
267 (status & USBPORTSC_SUSP) ? " Suspend" : "",
268 (status & USBPORTSC_OCC) ? " OverCurrentChange" : "",
269 (status & USBPORTSC_OC) ? " OverCurrent" : "",
270 (status & USBPORTSC_PR) ? " Reset" : "",
271 (status & USBPORTSC_LSDA) ? " LowSpeed" : "",
272 (status & USBPORTSC_RD) ? " ResumeDetect" : "",
273 (status & USBPORTSC_PEC) ? " EnableChange" : "",
274 (status & USBPORTSC_PE) ? " Enabled" : "",
275 (status & USBPORTSC_CSC) ? " ConnectChange" : "",
276 (status & USBPORTSC_CCS) ? " Connected" : "");
277 }
278
uhci_show_root_hub_state(struct uhci_hcd * uhci,char * buf)279 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf)
280 {
281 char *rh_state;
282
283 switch (uhci->rh_state) {
284 case UHCI_RH_RESET:
285 rh_state = "reset"; break;
286 case UHCI_RH_SUSPENDED:
287 rh_state = "suspended"; break;
288 case UHCI_RH_AUTO_STOPPED:
289 rh_state = "auto-stopped"; break;
290 case UHCI_RH_RESUMING:
291 rh_state = "resuming"; break;
292 case UHCI_RH_SUSPENDING:
293 rh_state = "suspending"; break;
294 case UHCI_RH_RUNNING:
295 rh_state = "running"; break;
296 case UHCI_RH_RUNNING_NODEVS:
297 rh_state = "running, no devs"; break;
298 default:
299 rh_state = "?"; break;
300 }
301 return sprintf(buf, "Root-hub state: %s FSBR: %d\n",
302 rh_state, uhci->fsbr_is_on);
303 }
304
uhci_show_status(struct uhci_hcd * uhci,char * buf,int len)305 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
306 {
307 char *out = buf;
308 unsigned short usbcmd, usbstat, usbint, usbfrnum;
309 unsigned int flbaseadd;
310 unsigned char sof;
311 unsigned short portsc1, portsc2;
312
313
314 usbcmd = uhci_readw(uhci, USBCMD);
315 usbstat = uhci_readw(uhci, USBSTS);
316 usbint = uhci_readw(uhci, USBINTR);
317 usbfrnum = uhci_readw(uhci, USBFRNUM);
318 flbaseadd = uhci_readl(uhci, USBFLBASEADD);
319 sof = uhci_readb(uhci, USBSOF);
320 portsc1 = uhci_readw(uhci, USBPORTSC1);
321 portsc2 = uhci_readw(uhci, USBPORTSC2);
322
323 out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n",
324 usbcmd,
325 (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
326 (usbcmd & USBCMD_CF) ? "CF " : "",
327 (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
328 (usbcmd & USBCMD_FGR) ? "FGR " : "",
329 (usbcmd & USBCMD_EGSM) ? "EGSM " : "",
330 (usbcmd & USBCMD_GRESET) ? "GRESET " : "",
331 (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
332 (usbcmd & USBCMD_RS) ? "RS " : "");
333 if (out - buf > len)
334 goto done;
335
336 out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n",
337 usbstat,
338 (usbstat & USBSTS_HCH) ? "HCHalted " : "",
339 (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
340 (usbstat & USBSTS_HSE) ? "HostSystemError " : "",
341 (usbstat & USBSTS_RD) ? "ResumeDetect " : "",
342 (usbstat & USBSTS_ERROR) ? "USBError " : "",
343 (usbstat & USBSTS_USBINT) ? "USBINT " : "");
344 if (out - buf > len)
345 goto done;
346
347 out += sprintf(out, " usbint = %04x\n", usbint);
348 out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1,
349 0xfff & (4*(unsigned int)usbfrnum));
350 out += sprintf(out, " flbaseadd = %08x\n", flbaseadd);
351 out += sprintf(out, " sof = %02x\n", sof);
352 if (out - buf > len)
353 goto done;
354
355 out += uhci_show_sc(1, portsc1, out);
356 if (out - buf > len)
357 goto done;
358
359 out += uhci_show_sc(2, portsc2, out);
360 if (out - buf > len)
361 goto done;
362
363 out += sprintf(out,
364 "Most recent frame: %x (%d) Last ISO frame: %x (%d)\n",
365 uhci->frame_number, uhci->frame_number & 1023,
366 uhci->last_iso_frame, uhci->last_iso_frame & 1023);
367
368 done:
369 if (out - buf > len)
370 out += sprintf(out, " ...\n");
371 return out - buf;
372 }
373
uhci_sprint_schedule(struct uhci_hcd * uhci,char * buf,int len)374 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
375 {
376 char *out = buf;
377 int i, j;
378 struct uhci_qh *qh;
379 struct uhci_td *td;
380 struct list_head *tmp, *head;
381 int nframes, nerrs;
382 __hc32 link;
383 __hc32 fsbr_link;
384
385 static const char * const qh_names[] = {
386 "unlink", "iso", "int128", "int64", "int32", "int16",
387 "int8", "int4", "int2", "async", "term"
388 };
389
390 out += uhci_show_root_hub_state(uhci, out);
391 if (out - buf > len)
392 goto done;
393 out += sprintf(out, "HC status\n");
394 out += uhci_show_status(uhci, out, len - (out - buf));
395 if (out - buf > len)
396 goto tail;
397
398 out += sprintf(out, "Periodic load table\n");
399 for (i = 0; i < MAX_PHASE; ++i) {
400 out += sprintf(out, "\t%d", uhci->load[i]);
401 if (i % 8 == 7)
402 *out++ = '\n';
403 }
404 out += sprintf(out, "Total: %d, #INT: %d, #ISO: %d\n",
405 uhci->total_load,
406 uhci_to_hcd(uhci)->self.bandwidth_int_reqs,
407 uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs);
408 if (debug <= 1)
409 goto tail;
410
411 out += sprintf(out, "Frame List\n");
412 nframes = 10;
413 nerrs = 0;
414 for (i = 0; i < UHCI_NUMFRAMES; ++i) {
415 __hc32 qh_dma;
416
417 if (out - buf > len)
418 goto done;
419 j = 0;
420 td = uhci->frame_cpu[i];
421 link = uhci->frame[i];
422 if (!td)
423 goto check_link;
424
425 if (nframes > 0) {
426 out += sprintf(out, "- Frame %d -> (%08x)\n",
427 i, hc32_to_cpu(uhci, link));
428 j = 1;
429 }
430
431 head = &td->fl_list;
432 tmp = head;
433 do {
434 td = list_entry(tmp, struct uhci_td, fl_list);
435 tmp = tmp->next;
436 if (link != LINK_TO_TD(uhci, td)) {
437 if (nframes > 0) {
438 out += sprintf(out,
439 " link does not match list entry!\n");
440 if (out - buf > len)
441 goto done;
442 } else
443 ++nerrs;
444 }
445 if (nframes > 0) {
446 out += uhci_show_td(uhci, td, out,
447 len - (out - buf), 4);
448 if (out - buf > len)
449 goto tail;
450 }
451 link = td->link;
452 } while (tmp != head);
453
454 check_link:
455 qh_dma = uhci_frame_skel_link(uhci, i);
456 if (link != qh_dma) {
457 if (nframes > 0) {
458 if (!j) {
459 out += sprintf(out,
460 "- Frame %d -> (%08x)\n",
461 i, hc32_to_cpu(uhci, link));
462 j = 1;
463 }
464 out += sprintf(out,
465 " link does not match QH (%08x)!\n",
466 hc32_to_cpu(uhci, qh_dma));
467 if (out - buf > len)
468 goto done;
469 } else
470 ++nerrs;
471 }
472 nframes -= j;
473 }
474 if (nerrs > 0)
475 out += sprintf(out, "Skipped %d bad links\n", nerrs);
476
477 out += sprintf(out, "Skeleton QHs\n");
478
479 if (out - buf > len)
480 goto done;
481
482 fsbr_link = 0;
483 for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
484 int cnt = 0;
485
486 qh = uhci->skelqh[i];
487 out += sprintf(out, "- skel_%s_qh\n", qh_names[i]);
488 out += uhci_show_qh(uhci, qh, out, len - (out - buf), 4);
489 if (out - buf > len)
490 goto tail;
491
492 /* Last QH is the Terminating QH, it's different */
493 if (i == SKEL_TERM) {
494 if (qh_element(qh) != LINK_TO_TD(uhci, uhci->term_td)) {
495 out += sprintf(out,
496 " skel_term_qh element is not set to term_td!\n");
497 if (out - buf > len)
498 goto done;
499 }
500 link = fsbr_link;
501 if (!link)
502 link = LINK_TO_QH(uhci, uhci->skel_term_qh);
503 goto check_qh_link;
504 }
505
506 head = &qh->node;
507 tmp = head->next;
508
509 while (tmp != head) {
510 qh = list_entry(tmp, struct uhci_qh, node);
511 tmp = tmp->next;
512 if (++cnt <= 10) {
513 out += uhci_show_qh(uhci, qh, out,
514 len - (out - buf), 4);
515 if (out - buf > len)
516 goto tail;
517 }
518 if (!fsbr_link && qh->skel >= SKEL_FSBR)
519 fsbr_link = LINK_TO_QH(uhci, qh);
520 }
521 if ((cnt -= 10) > 0)
522 out += sprintf(out, " Skipped %d QHs\n", cnt);
523
524 link = UHCI_PTR_TERM(uhci);
525 if (i <= SKEL_ISO)
526 ;
527 else if (i < SKEL_ASYNC)
528 link = LINK_TO_QH(uhci, uhci->skel_async_qh);
529 else if (!uhci->fsbr_is_on)
530 ;
531 else
532 link = LINK_TO_QH(uhci, uhci->skel_term_qh);
533 check_qh_link:
534 if (qh->link != link)
535 out += sprintf(out,
536 " last QH not linked to next skeleton!\n");
537
538 if (out - buf > len)
539 goto done;
540 }
541
542 done:
543 if (out - buf > len)
544 out += sprintf(out, " ...\n");
545 tail:
546 return out - buf;
547 }
548
549 #ifdef CONFIG_DEBUG_FS
550
551 #define MAX_OUTPUT (64 * 1024)
552
553 struct uhci_debug {
554 int size;
555 char *data;
556 };
557
uhci_debug_open(struct inode * inode,struct file * file)558 static int uhci_debug_open(struct inode *inode, struct file *file)
559 {
560 struct uhci_hcd *uhci = inode->i_private;
561 struct uhci_debug *up;
562 unsigned long flags;
563
564 up = kmalloc(sizeof(*up), GFP_KERNEL);
565 if (!up)
566 return -ENOMEM;
567
568 up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
569 if (!up->data) {
570 kfree(up);
571 return -ENOMEM;
572 }
573
574 up->size = 0;
575 spin_lock_irqsave(&uhci->lock, flags);
576 if (uhci->is_initialized)
577 up->size = uhci_sprint_schedule(uhci, up->data,
578 MAX_OUTPUT - EXTRA_SPACE);
579 spin_unlock_irqrestore(&uhci->lock, flags);
580
581 file->private_data = up;
582
583 return 0;
584 }
585
uhci_debug_lseek(struct file * file,loff_t off,int whence)586 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
587 {
588 struct uhci_debug *up = file->private_data;
589 return no_seek_end_llseek_size(file, off, whence, up->size);
590 }
591
uhci_debug_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)592 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
593 size_t nbytes, loff_t *ppos)
594 {
595 struct uhci_debug *up = file->private_data;
596 return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
597 }
598
uhci_debug_release(struct inode * inode,struct file * file)599 static int uhci_debug_release(struct inode *inode, struct file *file)
600 {
601 struct uhci_debug *up = file->private_data;
602
603 kfree(up->data);
604 kfree(up);
605
606 return 0;
607 }
608
609 static const struct file_operations uhci_debug_operations = {
610 .owner = THIS_MODULE,
611 .open = uhci_debug_open,
612 .llseek = uhci_debug_lseek,
613 .read = uhci_debug_read,
614 .release = uhci_debug_release,
615 };
616 #define UHCI_DEBUG_OPS
617
618 #endif /* CONFIG_DEBUG_FS */
619
620 #else /* CONFIG_DYNAMIC_DEBUG*/
621
lprintk(char * buf)622 static inline void lprintk(char *buf)
623 {}
624
uhci_show_qh(struct uhci_hcd * uhci,struct uhci_qh * qh,char * buf,int len,int space)625 static inline int uhci_show_qh(struct uhci_hcd *uhci,
626 struct uhci_qh *qh, char *buf, int len, int space)
627 {
628 return 0;
629 }
630
uhci_sprint_schedule(struct uhci_hcd * uhci,char * buf,int len)631 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
632 char *buf, int len)
633 {
634 return 0;
635 }
636
637 #endif
638