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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / drivers / usb / host / uhci-debug.c
blob8e239cdd95d51025c8ca806da08899a420a19e09
1 /*
2 * UHCI-specific debugging code. Invaluable when something
3 * goes wrong, but don't get in my face.
4 *
5 * Kernel visible pointers are surrounded in []s and bus
6 * visible pointers are surrounded in ()s
7 *
8 * (C) Copyright 1999 Linus Torvalds
9 * (C) Copyright 1999-2001 Johannes Erdfelt
10 */
11
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/debugfs.h>
15 #include <asm/io.h>
16
17 #include "uhci-hcd.h"
18
19 #define EXTRA_SPACE 1024
20
21 static struct dentry *uhci_debugfs_root;
22
23 #ifdef DEBUG
24
25 /* Handle REALLY large printks so we don't overflow buffers */
26 static void lprintk(char *buf)
27 {
28 char *p;
29
30 /* Just write one line at a time */
31 while (buf) {
32 p = strchr(buf, '\n');
33 if (p)
34 *p = 0;
35 printk(KERN_DEBUG "%s\n", buf);
36 buf = p;
37 if (buf)
38 buf++;
39 }
40 }
41
42 static int uhci_show_td(struct uhci_hcd *uhci, struct uhci_td *td, char *buf,
43 int len, int space)
44 {
45 char *out = buf;
46 char *spid;
47 u32 status, token;
48
49 status = td_status(uhci, td);
50 out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td,
51 hc32_to_cpu(uhci, td->link));
52 out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
53 ((status >> 27) & 3),
54 (status & TD_CTRL_SPD) ? "SPD " : "",
55 (status & TD_CTRL_LS) ? "LS " : "",
56 (status & TD_CTRL_IOC) ? "IOC " : "",
57 (status & TD_CTRL_ACTIVE) ? "Active " : "",
58 (status & TD_CTRL_STALLED) ? "Stalled " : "",
59 (status & TD_CTRL_DBUFERR) ? "DataBufErr " : "",
60 (status & TD_CTRL_BABBLE) ? "Babble " : "",
61 (status & TD_CTRL_NAK) ? "NAK " : "",
62 (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
63 (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
64 status & 0x7ff);
65 if (out - buf > len)
66 goto done;
67
68 token = td_token(uhci, td);
69 switch (uhci_packetid(token)) {
70 case USB_PID_SETUP:
71 spid = "SETUP";
72 break;
73 case USB_PID_OUT:
74 spid = "OUT";
75 break;
76 case USB_PID_IN:
77 spid = "IN";
78 break;
79 default:
80 spid = "?";
81 break;
82 }
83
84 out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
85 token >> 21,
86 ((token >> 19) & 1),
87 (token >> 15) & 15,
88 (token >> 8) & 127,
89 (token & 0xff),
90 spid);
91 out += sprintf(out, "(buf=%08x)\n", hc32_to_cpu(uhci, td->buffer));
92
93 done:
94 if (out - buf > len)
95 out += sprintf(out, " ...\n");
96 return out - buf;
97 }
98
99 static int uhci_show_urbp(struct uhci_hcd *uhci, struct urb_priv *urbp,
100 char *buf, int len, int space)
101 {
102 char *out = buf;
103 struct uhci_td *td;
104 int i, nactive, ninactive;
105 char *ptype;
106
107
108 out += sprintf(out, "urb_priv [%p] ", urbp);
109 out += sprintf(out, "urb [%p] ", urbp->urb);
110 out += sprintf(out, "qh [%p] ", urbp->qh);
111 out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
112 out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
113 (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
114 if (out - buf > len)
115 goto done;
116
117 switch (usb_pipetype(urbp->urb->pipe)) {
118 case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
119 case PIPE_INTERRUPT: ptype = "INT"; break;
120 case PIPE_BULK: ptype = "BLK"; break;
121 default:
122 case PIPE_CONTROL: ptype = "CTL"; break;
123 }
124
125 out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
126 out += sprintf(out, " Actlen=%d%s", urbp->urb->actual_length,
127 (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ?
128 "-8" : ""));
129
130 if (urbp->urb->unlinked)
131 out += sprintf(out, " Unlinked=%d", urbp->urb->unlinked);
132 out += sprintf(out, "\n");
133
134 if (out - buf > len)
135 goto done;
136
137 i = nactive = ninactive = 0;
138 list_for_each_entry(td, &urbp->td_list, list) {
139 if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC &&
140 (++i <= 10 || debug > 2)) {
141 out += sprintf(out, "%*s%d: ", space + 2, "", i);
142 out += uhci_show_td(uhci, td, out,
143 len - (out - buf), 0);
144 if (out - buf > len)
145 goto tail;
146 } else {
147 if (td_status(uhci, td) & TD_CTRL_ACTIVE)
148 ++nactive;
149 else
150 ++ninactive;
151 }
152 }
153 if (nactive + ninactive > 0)
154 out += sprintf(out,
155 "%*s[skipped %d inactive and %d active TDs]\n",
156 space, "", ninactive, nactive);
157 done:
158 if (out - buf > len)
159 out += sprintf(out, " ...\n");
160 tail:
161 return out - buf;
162 }
163
164 static int uhci_show_qh(struct uhci_hcd *uhci,
165 struct uhci_qh *qh, char *buf, int len, int space)
166 {
167 char *out = buf;
168 int i, nurbs;
169 __hc32 element = qh_element(qh);
170 char *qtype;
171
172 switch (qh->type) {
173 case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
174 case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
175 case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
176 case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
177 default: qtype = "Skel" ; break;
178 }
179
180 out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
181 space, "", qh, qtype,
182 hc32_to_cpu(uhci, qh->link),
183 hc32_to_cpu(uhci, element));
184 if (qh->type == USB_ENDPOINT_XFER_ISOC)
185 out += sprintf(out,
186 "%*s period %d phase %d load %d us, frame %x desc [%p]\n",
187 space, "", qh->period, qh->phase, qh->load,
188 qh->iso_frame, qh->iso_packet_desc);
189 else if (qh->type == USB_ENDPOINT_XFER_INT)
190 out += sprintf(out, "%*s period %d phase %d load %d us\n",
191 space, "", qh->period, qh->phase, qh->load);
192 if (out - buf > len)
193 goto done;
194
195 if (element & UHCI_PTR_QH(uhci))
196 out += sprintf(out, "%*s Element points to QH (bug?)\n", space, "");
197
198 if (element & UHCI_PTR_DEPTH(uhci))
199 out += sprintf(out, "%*s Depth traverse\n", space, "");
200
201 if (element & cpu_to_hc32(uhci, 8))
202 out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, "");
203
204 if (!(element & ~(UHCI_PTR_QH(uhci) | UHCI_PTR_DEPTH(uhci))))
205 out += sprintf(out, "%*s Element is NULL (bug?)\n", space, "");
206
207 if (out - buf > len)
208 goto done;
209
210 if (list_empty(&qh->queue)) {
211 out += sprintf(out, "%*s queue is empty\n", space, "");
212 if (qh == uhci->skel_async_qh) {
213 out += uhci_show_td(uhci, uhci->term_td, out,
214 len - (out - buf), 0);
215 if (out - buf > len)
216 goto tail;
217 }
218 } else {
219 struct urb_priv *urbp = list_entry(qh->queue.next,
220 struct urb_priv, node);
221 struct uhci_td *td = list_entry(urbp->td_list.next,
222 struct uhci_td, list);
223
224 if (element != LINK_TO_TD(uhci, td))
225 out += sprintf(out, "%*s Element != First TD\n",
226 space, "");
227 i = nurbs = 0;
228 list_for_each_entry(urbp, &qh->queue, node) {
229 if (++i <= 10) {
230 out += uhci_show_urbp(uhci, urbp, out,
231 len - (out - buf), space + 2);
232 if (out - buf > len)
233 goto tail;
234 }
235 else
236 ++nurbs;
237 }
238 if (nurbs > 0)
239 out += sprintf(out, "%*s Skipped %d URBs\n",
240 space, "", nurbs);
241 }
242
243 if (out - buf > len)
244 goto done;
245
246 if (qh->dummy_td) {
247 out += sprintf(out, "%*s Dummy TD\n", space, "");
248 out += uhci_show_td(uhci, qh->dummy_td, out,
249 len - (out - buf), 0);
250 if (out - buf > len)
251 goto tail;
252 }
253
254 done:
255 if (out - buf > len)
256 out += sprintf(out, " ...\n");
257 tail:
258 return out - buf;
259 }
260
261 static int uhci_show_sc(int port, unsigned short status, char *buf)
262 {
263 return sprintf(buf, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n",
264 port,
265 status,
266 (status & USBPORTSC_SUSP) ? " Suspend" : "",
267 (status & USBPORTSC_OCC) ? " OverCurrentChange" : "",
268 (status & USBPORTSC_OC) ? " OverCurrent" : "",
269 (status & USBPORTSC_PR) ? " Reset" : "",
270 (status & USBPORTSC_LSDA) ? " LowSpeed" : "",
271 (status & USBPORTSC_RD) ? " ResumeDetect" : "",
272 (status & USBPORTSC_PEC) ? " EnableChange" : "",
273 (status & USBPORTSC_PE) ? " Enabled" : "",
274 (status & USBPORTSC_CSC) ? " ConnectChange" : "",
275 (status & USBPORTSC_CCS) ? " Connected" : "");
276 }
277
278 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf)
279 {
280 char *rh_state;
281
282 switch (uhci->rh_state) {
283 case UHCI_RH_RESET:
284 rh_state = "reset"; break;
285 case UHCI_RH_SUSPENDED:
286 rh_state = "suspended"; break;
287 case UHCI_RH_AUTO_STOPPED:
288 rh_state = "auto-stopped"; break;
289 case UHCI_RH_RESUMING:
290 rh_state = "resuming"; break;
291 case UHCI_RH_SUSPENDING:
292 rh_state = "suspending"; break;
293 case UHCI_RH_RUNNING:
294 rh_state = "running"; break;
295 case UHCI_RH_RUNNING_NODEVS:
296 rh_state = "running, no devs"; break;
297 default:
298 rh_state = "?"; break;
299 }
300 return sprintf(buf, "Root-hub state: %s FSBR: %d\n",
301 rh_state, uhci->fsbr_is_on);
302 }
303
304 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
305 {
306 char *out = buf;
307 unsigned short usbcmd, usbstat, usbint, usbfrnum;
308 unsigned int flbaseadd;
309 unsigned char sof;
310 unsigned short portsc1, portsc2;
311
312
313 usbcmd = uhci_readw(uhci, USBCMD);
314 usbstat = uhci_readw(uhci, USBSTS);
315 usbint = uhci_readw(uhci, USBINTR);
316 usbfrnum = uhci_readw(uhci, USBFRNUM);
317 flbaseadd = uhci_readl(uhci, USBFLBASEADD);
318 sof = uhci_readb(uhci, USBSOF);
319 portsc1 = uhci_readw(uhci, USBPORTSC1);
320 portsc2 = uhci_readw(uhci, USBPORTSC2);
321
322 out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n",
323 usbcmd,
324 (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
325 (usbcmd & USBCMD_CF) ? "CF " : "",
326 (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
327 (usbcmd & USBCMD_FGR) ? "FGR " : "",
328 (usbcmd & USBCMD_EGSM) ? "EGSM " : "",
329 (usbcmd & USBCMD_GRESET) ? "GRESET " : "",
330 (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
331 (usbcmd & USBCMD_RS) ? "RS " : "");
332 if (out - buf > len)
333 goto done;
334
335 out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n",
336 usbstat,
337 (usbstat & USBSTS_HCH) ? "HCHalted " : "",
338 (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
339 (usbstat & USBSTS_HSE) ? "HostSystemError " : "",
340 (usbstat & USBSTS_RD) ? "ResumeDetect " : "",
341 (usbstat & USBSTS_ERROR) ? "USBError " : "",
342 (usbstat & USBSTS_USBINT) ? "USBINT " : "");
343 if (out - buf > len)
344 goto done;
345
346 out += sprintf(out, " usbint = %04x\n", usbint);
347 out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1,
348 0xfff & (4*(unsigned int)usbfrnum));
349 out += sprintf(out, " flbaseadd = %08x\n", flbaseadd);
350 out += sprintf(out, " sof = %02x\n", sof);
351 if (out - buf > len)
352 goto done;
353
354 out += uhci_show_sc(1, portsc1, out);
355 if (out - buf > len)
356 goto done;
357
358 out += uhci_show_sc(2, portsc2, out);
359 if (out - buf > len)
360 goto done;
361
362 out += sprintf(out,
363 "Most recent frame: %x (%d) Last ISO frame: %x (%d)\n",
364 uhci->frame_number, uhci->frame_number & 1023,
365 uhci->last_iso_frame, uhci->last_iso_frame & 1023);
366
367 done:
368 if (out - buf > len)
369 out += sprintf(out, " ...\n");
370 return out - buf;
371 }
372
373 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
374 {
375 char *out = buf;
376 int i, j;
377 struct uhci_qh *qh;
378 struct uhci_td *td;
379 struct list_head *tmp, *head;
380 int nframes, nerrs;
381 __hc32 link;
382 __hc32 fsbr_link;
383
384 static const char * const qh_names[] = {
385 "unlink", "iso", "int128", "int64", "int32", "int16",
386 "int8", "int4", "int2", "async", "term"
387 };
388
389 out += uhci_show_root_hub_state(uhci, out);
390 if (out - buf > len)
391 goto done;
392 out += sprintf(out, "HC status\n");
393 out += uhci_show_status(uhci, out, len - (out - buf));
394 if (out - buf > len)
395 goto tail;
396
397 out += sprintf(out, "Periodic load table\n");
398 for (i = 0; i < MAX_PHASE; ++i) {
399 out += sprintf(out, "\t%d", uhci->load[i]);
400 if (i % 8 == 7)
401 *out++ = '\n';
402 }
403 out += sprintf(out, "Total: %d, #INT: %d, #ISO: %d\n",
404 uhci->total_load,
405 uhci_to_hcd(uhci)->self.bandwidth_int_reqs,
406 uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs);
407 if (debug <= 1)
408 goto tail;
409
410 out += sprintf(out, "Frame List\n");
411 nframes = 10;
412 nerrs = 0;
413 for (i = 0; i < UHCI_NUMFRAMES; ++i) {
414 __hc32 qh_dma;
415
416 if (out - buf > len)
417 goto done;
418 j = 0;
419 td = uhci->frame_cpu[i];
420 link = uhci->frame[i];
421 if (!td)
422 goto check_link;
423
424 if (nframes > 0) {
425 out += sprintf(out, "- Frame %d -> (%08x)\n",
426 i, hc32_to_cpu(uhci, link));
427 j = 1;
428 }
429
430 head = &td->fl_list;
431 tmp = head;
432 do {
433 td = list_entry(tmp, struct uhci_td, fl_list);
434 tmp = tmp->next;
435 if (link != LINK_TO_TD(uhci, td)) {
436 if (nframes > 0) {
437 out += sprintf(out,
438 " link does not match list entry!\n");
439 if (out - buf > len)
440 goto done;
441 } else
442 ++nerrs;
443 }
444 if (nframes > 0) {
445 out += uhci_show_td(uhci, td, out,
446 len - (out - buf), 4);
447 if (out - buf > len)
448 goto tail;
449 }
450 link = td->link;
451 } while (tmp != head);
452
453 check_link:
454 qh_dma = uhci_frame_skel_link(uhci, i);
455 if (link != qh_dma) {
456 if (nframes > 0) {
457 if (!j) {
458 out += sprintf(out,
459 "- Frame %d -> (%08x)\n",
460 i, hc32_to_cpu(uhci, link));
461 j = 1;
462 }
463 out += sprintf(out,
464 " link does not match QH (%08x)!\n",
465 hc32_to_cpu(uhci, qh_dma));
466 if (out - buf > len)
467 goto done;
468 } else
469 ++nerrs;
470 }
471 nframes -= j;
472 }
473 if (nerrs > 0)
474 out += sprintf(out, "Skipped %d bad links\n", nerrs);
475
476 out += sprintf(out, "Skeleton QHs\n");
477
478 if (out - buf > len)
479 goto done;
480
481 fsbr_link = 0;
482 for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
483 int cnt = 0;
484
485 qh = uhci->skelqh[i];
486 out += sprintf(out, "- skel_%s_qh\n", qh_names[i]);
487 out += uhci_show_qh(uhci, qh, out, len - (out - buf), 4);
488 if (out - buf > len)
489 goto tail;
490
491 /* Last QH is the Terminating QH, it's different */
492 if (i == SKEL_TERM) {
493 if (qh_element(qh) != LINK_TO_TD(uhci, uhci->term_td)) {
494 out += sprintf(out,
495 " skel_term_qh element is not set to term_td!\n");
496 if (out - buf > len)
497 goto done;
498 }
499 link = fsbr_link;
500 if (!link)
501 link = LINK_TO_QH(uhci, uhci->skel_term_qh);
502 goto check_qh_link;
503 }
504
505 head = &qh->node;
506 tmp = head->next;
507
508 while (tmp != head) {
509 qh = list_entry(tmp, struct uhci_qh, node);
510 tmp = tmp->next;
511 if (++cnt <= 10) {
512 out += uhci_show_qh(uhci, qh, out,
513 len - (out - buf), 4);
514 if (out - buf > len)
515 goto tail;
516 }
517 if (!fsbr_link && qh->skel >= SKEL_FSBR)
518 fsbr_link = LINK_TO_QH(uhci, qh);
519 }
520 if ((cnt -= 10) > 0)
521 out += sprintf(out, " Skipped %d QHs\n", cnt);
522
523 link = UHCI_PTR_TERM(uhci);
524 if (i <= SKEL_ISO)
525 ;
526 else if (i < SKEL_ASYNC)
527 link = LINK_TO_QH(uhci, uhci->skel_async_qh);
528 else if (!uhci->fsbr_is_on)
529 ;
530 else
531 link = LINK_TO_QH(uhci, uhci->skel_term_qh);
532 check_qh_link:
533 if (qh->link != link)
534 out += sprintf(out,
535 " last QH not linked to next skeleton!\n");
536
537 if (out - buf > len)
538 goto done;
539 }
540
541 done:
542 if (out - buf > len)
543 out += sprintf(out, " ...\n");
544 tail:
545 return out - buf;
546 }
547
548 #ifdef CONFIG_DEBUG_FS
549
550 #define MAX_OUTPUT (64 * 1024)
551
552 struct uhci_debug {
553 int size;
554 char *data;
555 };
556
557 static int uhci_debug_open(struct inode *inode, struct file *file)
558 {
559 struct uhci_hcd *uhci = inode->i_private;
560 struct uhci_debug *up;
561 unsigned long flags;
562
563 up = kmalloc(sizeof(*up), GFP_KERNEL);
564 if (!up)
565 return -ENOMEM;
566
567 up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
568 if (!up->data) {
569 kfree(up);
570 return -ENOMEM;
571 }
572
573 up->size = 0;
574 spin_lock_irqsave(&uhci->lock, flags);
575 if (uhci->is_initialized)
576 up->size = uhci_sprint_schedule(uhci, up->data,
577 MAX_OUTPUT - EXTRA_SPACE);
578 spin_unlock_irqrestore(&uhci->lock, flags);
579
580 file->private_data = up;
581
582 return 0;
583 }
584
585 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
586 {
587 struct uhci_debug *up;
588 loff_t new = -1;
589
590 up = file->private_data;
591
592 /*
593 * XXX: atomic 64bit seek access, but that needs to be fixed in the VFS
594 */
595 switch (whence) {
596 case 0:
597 new = off;
598 break;
599 case 1:
600 new = file->f_pos + off;
601 break;
602 }
603
604 if (new < 0 || new > up->size)
605 return -EINVAL;
606
607 return (file->f_pos = new);
608 }
609
610 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
611 size_t nbytes, loff_t *ppos)
612 {
613 struct uhci_debug *up = file->private_data;
614 return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
615 }
616
617 static int uhci_debug_release(struct inode *inode, struct file *file)
618 {
619 struct uhci_debug *up = file->private_data;
620
621 kfree(up->data);
622 kfree(up);
623
624 return 0;
625 }
626
627 static const struct file_operations uhci_debug_operations = {
628 .owner = THIS_MODULE,
629 .open = uhci_debug_open,
630 .llseek = uhci_debug_lseek,
631 .read = uhci_debug_read,
632 .release = uhci_debug_release,
633 };
634 #define UHCI_DEBUG_OPS
635
636 #endif /* CONFIG_DEBUG_FS */
637
638 #else /* DEBUG */
639
640 static inline void lprintk(char *buf)
641 {}
642
643 static inline int uhci_show_qh(struct uhci_hcd *uhci,
644 struct uhci_qh *qh, char *buf, int len, int space)
645 {
646 return 0;
647 }
648
649 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
650 char *buf, int len)
651 {
652 return 0;
653 }
654
655 #endif
Linus' kernel tree