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/kernel.h>
13 #include <linux/debugfs.h>
14 #include <linux/smp_lock.h>
15 #include <asm/io.h>
16
17 #include "uhci-hcd.h"
18
19 #define uhci_debug_operations (* (const struct file_operations *) NULL)
20 static struct dentry *uhci_debugfs_root;
21
22 #ifdef DEBUG
23
24 /* Handle REALLY large printks so we don't overflow buffers */
25 static void lprintk(char *buf)
26 {
27 char *p;
28
29 /* Just write one line at a time */
30 while (buf) {
31 p = strchr(buf, '\n');
32 if (p)
33 *p = 0;
34 printk(KERN_DEBUG "%s\n", buf);
35 buf = p;
36 if (buf)
37 buf++;
38 }
39 }
40
41 static int uhci_show_td(struct uhci_td *td, char *buf, int len, int space)
42 {
43 char *out = buf;
44 char *spid;
45 u32 status, token;
46
47 /* Try to make sure there's enough memory */
48 if (len < 160)
49 return 0;
50
51 status = td_status(td);
52 out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(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
67 token = td_token(td);
68 switch (uhci_packetid(token)) {
69 case USB_PID_SETUP:
70 spid = "SETUP";
71 break;
72 case USB_PID_OUT:
73 spid = "OUT";
74 break;
75 case USB_PID_IN:
76 spid = "IN";
77 break;
78 default:
79 spid = "?";
80 break;
81 }
82
83 out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
84 token >> 21,
85 ((token >> 19) & 1),
86 (token >> 15) & 15,
87 (token >> 8) & 127,
88 (token & 0xff),
89 spid);
90 out += sprintf(out, "(buf=%08x)\n", le32_to_cpu(td->buffer));
91
92 return out - buf;
93 }
94
95 static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
96 {
97 char *out = buf;
98 struct uhci_td *td;
99 int i, nactive, ninactive;
100 char *ptype;
101
102 if (len < 200)
103 return 0;
104
105 out += sprintf(out, "urb_priv [%p] ", urbp);
106 out += sprintf(out, "urb [%p] ", urbp->urb);
107 out += sprintf(out, "qh [%p] ", urbp->qh);
108 out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
109 out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
110 (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
111
112 switch (usb_pipetype(urbp->urb->pipe)) {
113 case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
114 case PIPE_INTERRUPT: ptype = "INT"; break;
115 case PIPE_BULK: ptype = "BLK"; break;
116 default:
117 case PIPE_CONTROL: ptype = "CTL"; break;
118 }
119
120 out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
121 out += sprintf(out, " Actlen=%d%s", urbp->urb->actual_length,
122 (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ?
123 "-8" : ""));
124
125 if (urbp->urb->unlinked)
126 out += sprintf(out, " Unlinked=%d", urbp->urb->unlinked);
127 out += sprintf(out, "\n");
128
129 i = nactive = ninactive = 0;
130 list_for_each_entry(td, &urbp->td_list, list) {
131 if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC &&
132 (++i <= 10 || debug > 2)) {
133 out += sprintf(out, "%*s%d: ", space + 2, "", i);
134 out += uhci_show_td(td, out, len - (out - buf), 0);
135 } else {
136 if (td_status(td) & TD_CTRL_ACTIVE)
137 ++nactive;
138 else
139 ++ninactive;
140 }
141 }
142 if (nactive + ninactive > 0)
143 out += sprintf(out, "%*s[skipped %d inactive and %d active "
144 "TDs]\n",
145 space, "", ninactive, nactive);
146
147 return out - buf;
148 }
149
150 static int uhci_show_qh(struct uhci_hcd *uhci,
151 struct uhci_qh *qh, char *buf, int len, int space)
152 {
153 char *out = buf;
154 int i, nurbs;
155 __le32 element = qh_element(qh);
156 char *qtype;
157
158 /* Try to make sure there's enough memory */
159 if (len < 80 * 7)
160 return 0;
161
162 switch (qh->type) {
163 case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
164 case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
165 case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
166 case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
167 default: qtype = "Skel" ; break;
168 }
169
170 out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
171 space, "", qh, qtype,
172 le32_to_cpu(qh->link), le32_to_cpu(element));
173 if (qh->type == USB_ENDPOINT_XFER_ISOC)
174 out += sprintf(out, "%*s period %d phase %d load %d us, "
175 "frame %x desc [%p]\n",
176 space, "", qh->period, qh->phase, qh->load,
177 qh->iso_frame, qh->iso_packet_desc);
178 else if (qh->type == USB_ENDPOINT_XFER_INT)
179 out += sprintf(out, "%*s period %d phase %d load %d us\n",
180 space, "", qh->period, qh->phase, qh->load);
181
182 if (element & UHCI_PTR_QH)
183 out += sprintf(out, "%*s Element points to QH (bug?)\n", space, "");
184
185 if (element & UHCI_PTR_DEPTH)
186 out += sprintf(out, "%*s Depth traverse\n", space, "");
187
188 if (element & cpu_to_le32(8))
189 out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, "");
190
191 if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH)))
192 out += sprintf(out, "%*s Element is NULL (bug?)\n", space, "");
193
194 if (list_empty(&qh->queue)) {
195 out += sprintf(out, "%*s queue is empty\n", space, "");
196 if (qh == uhci->skel_async_qh)
197 out += uhci_show_td(uhci->term_td, out,
198 len - (out - buf), 0);
199 } else {
200 struct urb_priv *urbp = list_entry(qh->queue.next,
201 struct urb_priv, node);
202 struct uhci_td *td = list_entry(urbp->td_list.next,
203 struct uhci_td, list);
204
205 if (element != LINK_TO_TD(td))
206 out += sprintf(out, "%*s Element != First TD\n",
207 space, "");
208 i = nurbs = 0;
209 list_for_each_entry(urbp, &qh->queue, node) {
210 if (++i <= 10)
211 out += uhci_show_urbp(urbp, out,
212 len - (out - buf), space + 2);
213 else
214 ++nurbs;
215 }
216 if (nurbs > 0)
217 out += sprintf(out, "%*s Skipped %d URBs\n",
218 space, "", nurbs);
219 }
220
221 if (qh->dummy_td) {
222 out += sprintf(out, "%*s Dummy TD\n", space, "");
223 out += uhci_show_td(qh->dummy_td, out, len - (out - buf), 0);
224 }
225
226 return out - buf;
227 }
228
229 static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
230 {
231 char *out = buf;
232
233 /* Try to make sure there's enough memory */
234 if (len < 160)
235 return 0;
236
237 out += sprintf(out, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n",
238 port,
239 status,
240 (status & USBPORTSC_SUSP) ? " Suspend" : "",
241 (status & USBPORTSC_OCC) ? " OverCurrentChange" : "",
242 (status & USBPORTSC_OC) ? " OverCurrent" : "",
243 (status & USBPORTSC_PR) ? " Reset" : "",
244 (status & USBPORTSC_LSDA) ? " LowSpeed" : "",
245 (status & USBPORTSC_RD) ? " ResumeDetect" : "",
246 (status & USBPORTSC_PEC) ? " EnableChange" : "",
247 (status & USBPORTSC_PE) ? " Enabled" : "",
248 (status & USBPORTSC_CSC) ? " ConnectChange" : "",
249 (status & USBPORTSC_CCS) ? " Connected" : "");
250
251 return out - buf;
252 }
253
254 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len)
255 {
256 char *out = buf;
257 char *rh_state;
258
259 /* Try to make sure there's enough memory */
260 if (len < 60)
261 return 0;
262
263 switch (uhci->rh_state) {
264 case UHCI_RH_RESET:
265 rh_state = "reset"; break;
266 case UHCI_RH_SUSPENDED:
267 rh_state = "suspended"; break;
268 case UHCI_RH_AUTO_STOPPED:
269 rh_state = "auto-stopped"; break;
270 case UHCI_RH_RESUMING:
271 rh_state = "resuming"; break;
272 case UHCI_RH_SUSPENDING:
273 rh_state = "suspending"; break;
274 case UHCI_RH_RUNNING:
275 rh_state = "running"; break;
276 case UHCI_RH_RUNNING_NODEVS:
277 rh_state = "running, no devs"; break;
278 default:
279 rh_state = "?"; break;
280 }
281 out += sprintf(out, "Root-hub state: %s FSBR: %d\n",
282 rh_state, uhci->fsbr_is_on);
283 return out - buf;
284 }
285
286 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
287 {
288 char *out = buf;
289 unsigned long io_addr = uhci->io_addr;
290 unsigned short usbcmd, usbstat, usbint, usbfrnum;
291 unsigned int flbaseadd;
292 unsigned char sof;
293 unsigned short portsc1, portsc2;
294
295 /* Try to make sure there's enough memory */
296 if (len < 80 * 9)
297 return 0;
298
299 usbcmd = inw(io_addr + 0);
300 usbstat = inw(io_addr + 2);
301 usbint = inw(io_addr + 4);
302 usbfrnum = inw(io_addr + 6);
303 flbaseadd = inl(io_addr + 8);
304 sof = inb(io_addr + 12);
305 portsc1 = inw(io_addr + 16);
306 portsc2 = inw(io_addr + 18);
307
308 out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n",
309 usbcmd,
310 (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
311 (usbcmd & USBCMD_CF) ? "CF " : "",
312 (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
313 (usbcmd & USBCMD_FGR) ? "FGR " : "",
314 (usbcmd & USBCMD_EGSM) ? "EGSM " : "",
315 (usbcmd & USBCMD_GRESET) ? "GRESET " : "",
316 (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
317 (usbcmd & USBCMD_RS) ? "RS " : "");
318
319 out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n",
320 usbstat,
321 (usbstat & USBSTS_HCH) ? "HCHalted " : "",
322 (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
323 (usbstat & USBSTS_HSE) ? "HostSystemError " : "",
324 (usbstat & USBSTS_RD) ? "ResumeDetect " : "",
325 (usbstat & USBSTS_ERROR) ? "USBError " : "",
326 (usbstat & USBSTS_USBINT) ? "USBINT " : "");
327
328 out += sprintf(out, " usbint = %04x\n", usbint);
329 out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1,
330 0xfff & (4*(unsigned int)usbfrnum));
331 out += sprintf(out, " flbaseadd = %08x\n", flbaseadd);
332 out += sprintf(out, " sof = %02x\n", sof);
333 out += uhci_show_sc(1, portsc1, out, len - (out - buf));
334 out += uhci_show_sc(2, portsc2, out, len - (out - buf));
335 out += sprintf(out, "Most recent frame: %x (%d) "
336 "Last ISO frame: %x (%d)\n",
337 uhci->frame_number, uhci->frame_number & 1023,
338 uhci->last_iso_frame, uhci->last_iso_frame & 1023);
339
340 return out - buf;
341 }
342
343 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
344 {
345 char *out = buf;
346 int i, j;
347 struct uhci_qh *qh;
348 struct uhci_td *td;
349 struct list_head *tmp, *head;
350 int nframes, nerrs;
351 __le32 link;
352 __le32 fsbr_link;
353
354 static const char * const qh_names[] = {
355 "unlink", "iso", "int128", "int64", "int32", "int16",
356 "int8", "int4", "int2", "async", "term"
357 };
358
359 out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
360 out += sprintf(out, "HC status\n");
361 out += uhci_show_status(uhci, out, len - (out - buf));
362
363 out += sprintf(out, "Periodic load table\n");
364 for (i = 0; i < MAX_PHASE; ++i) {
365 out += sprintf(out, "\t%d", uhci->load[i]);
366 if (i % 8 == 7)
367 *out++ = '\n';
368 }
369 out += sprintf(out, "Total: %d, #INT: %d, #ISO: %d\n",
370 uhci->total_load,
371 uhci_to_hcd(uhci)->self.bandwidth_int_reqs,
372 uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs);
373 if (debug <= 1)
374 return out - buf;
375
376 out += sprintf(out, "Frame List\n");
377 nframes = 10;
378 nerrs = 0;
379 for (i = 0; i < UHCI_NUMFRAMES; ++i) {
380 __le32 qh_dma;
381
382 j = 0;
383 td = uhci->frame_cpu[i];
384 link = uhci->frame[i];
385 if (!td)
386 goto check_link;
387
388 if (nframes > 0) {
389 out += sprintf(out, "- Frame %d -> (%08x)\n",
390 i, le32_to_cpu(link));
391 j = 1;
392 }
393
394 head = &td->fl_list;
395 tmp = head;
396 do {
397 td = list_entry(tmp, struct uhci_td, fl_list);
398 tmp = tmp->next;
399 if (link != LINK_TO_TD(td)) {
400 if (nframes > 0)
401 out += sprintf(out, " link does "
402 "not match list entry!\n");
403 else
404 ++nerrs;
405 }
406 if (nframes > 0)
407 out += uhci_show_td(td, out,
408 len - (out - buf), 4);
409 link = td->link;
410 } while (tmp != head);
411
412 check_link:
413 qh_dma = uhci_frame_skel_link(uhci, i);
414 if (link != qh_dma) {
415 if (nframes > 0) {
416 if (!j) {
417 out += sprintf(out,
418 "- Frame %d -> (%08x)\n",
419 i, le32_to_cpu(link));
420 j = 1;
421 }
422 out += sprintf(out, " link does not match "
423 "QH (%08x)!\n", le32_to_cpu(qh_dma));
424 } else
425 ++nerrs;
426 }
427 nframes -= j;
428 }
429 if (nerrs > 0)
430 out += sprintf(out, "Skipped %d bad links\n", nerrs);
431
432 out += sprintf(out, "Skeleton QHs\n");
433
434 fsbr_link = 0;
435 for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
436 int cnt = 0;
437
438 qh = uhci->skelqh[i];
439 out += sprintf(out, "- skel_%s_qh\n", qh_names[i]); \
440 out += uhci_show_qh(uhci, qh, out, len - (out - buf), 4);
441
442 /* Last QH is the Terminating QH, it's different */
443 if (i == SKEL_TERM) {
444 if (qh_element(qh) != LINK_TO_TD(uhci->term_td))
445 out += sprintf(out, " skel_term_qh element is not set to term_td!\n");
446 link = fsbr_link;
447 if (!link)
448 link = LINK_TO_QH(uhci->skel_term_qh);
449 goto check_qh_link;
450 }
451
452 head = &qh->node;
453 tmp = head->next;
454
455 while (tmp != head) {
456 qh = list_entry(tmp, struct uhci_qh, node);
457 tmp = tmp->next;
458 if (++cnt <= 10)
459 out += uhci_show_qh(uhci, qh, out,
460 len - (out - buf), 4);
461 if (!fsbr_link && qh->skel >= SKEL_FSBR)
462 fsbr_link = LINK_TO_QH(qh);
463 }
464 if ((cnt -= 10) > 0)
465 out += sprintf(out, " Skipped %d QHs\n", cnt);
466
467 link = UHCI_PTR_TERM;
468 if (i <= SKEL_ISO)
469 ;
470 else if (i < SKEL_ASYNC)
471 link = LINK_TO_QH(uhci->skel_async_qh);
472 else if (!uhci->fsbr_is_on)
473 ;
474 else
475 link = LINK_TO_QH(uhci->skel_term_qh);
476 check_qh_link:
477 if (qh->link != link)
478 out += sprintf(out, " last QH not linked to next skeleton!\n");
479 }
480
481 return out - buf;
482 }
483
484 #ifdef CONFIG_DEBUG_FS
485
486 #define MAX_OUTPUT (64 * 1024)
487
488 struct uhci_debug {
489 int size;
490 char *data;
491 };
492
493 static int uhci_debug_open(struct inode *inode, struct file *file)
494 {
495 struct uhci_hcd *uhci = inode->i_private;
496 struct uhci_debug *up;
497 int ret = -ENOMEM;
498 unsigned long flags;
499
500 lock_kernel();
501 up = kmalloc(sizeof(*up), GFP_KERNEL);
502 if (!up)
503 goto out;
504
505 up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
506 if (!up->data) {
507 kfree(up);
508 goto out;
509 }
510
511 up->size = 0;
512 spin_lock_irqsave(&uhci->lock, flags);
513 if (uhci->is_initialized)
514 up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT);
515 spin_unlock_irqrestore(&uhci->lock, flags);
516
517 file->private_data = up;
518
519 ret = 0;
520 out:
521 unlock_kernel();
522 return ret;
523 }
524
525 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
526 {
527 struct uhci_debug *up;
528 loff_t new = -1;
529
530 lock_kernel();
531 up = file->private_data;
532
533 switch (whence) {
534 case 0:
535 new = off;
536 break;
537 case 1:
538 new = file->f_pos + off;
539 break;
540 }
541 if (new < 0 || new > up->size) {
542 unlock_kernel();
543 return -EINVAL;
544 }
545 unlock_kernel();
546 return (file->f_pos = new);
547 }
548
549 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
550 size_t nbytes, loff_t *ppos)
551 {
552 struct uhci_debug *up = file->private_data;
553 return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
554 }
555
556 static int uhci_debug_release(struct inode *inode, struct file *file)
557 {
558 struct uhci_debug *up = file->private_data;
559
560 kfree(up->data);
561 kfree(up);
562
563 return 0;
564 }
565
566 #undef uhci_debug_operations
567 static const struct file_operations uhci_debug_operations = {
568 .owner = THIS_MODULE,
569 .open = uhci_debug_open,
570 .llseek = uhci_debug_lseek,
571 .read = uhci_debug_read,
572 .release = uhci_debug_release,
573 };
574
575 #endif /* CONFIG_DEBUG_FS */
576
577 #else /* DEBUG */
578
579 static inline void lprintk(char *buf)
580 {}
581
582 static inline int uhci_show_qh(struct uhci_hcd *uhci,
583 struct uhci_qh *qh, char *buf, int len, int space)
584 {
585 return 0;
586 }
587
588 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
589 char *buf, int len)
590 {
591 return 0;
592 }
593
594 #endif
595
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