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[PATCH] W1: possible cleanups
[linux-2.6/verdex.git] / drivers / usb / host / uhci-debug.c
blob6637a0e49978b0b897e671dfd54861db05eb0f89
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/config.h>
13 #include <linux/kernel.h>
14 #include <linux/debugfs.h>
15 #include <linux/smp_lock.h>
16 #include <asm/io.h>
17
18 #include "uhci-hcd.h"
19
20 #define uhci_debug_operations (* (struct file_operations *) NULL)
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_td *td, char *buf, int len, int space)
43 {
44 char *out = buf;
45 char *spid;
46 u32 status, token;
47
48 /* Try to make sure there's enough memory */
49 if (len < 160)
50 return 0;
51
52 status = td_status(td);
53 out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(td->link));
54 out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
55 ((status >> 27) & 3),
56 (status & TD_CTRL_SPD) ? "SPD " : "",
57 (status & TD_CTRL_LS) ? "LS " : "",
58 (status & TD_CTRL_IOC) ? "IOC " : "",
59 (status & TD_CTRL_ACTIVE) ? "Active " : "",
60 (status & TD_CTRL_STALLED) ? "Stalled " : "",
61 (status & TD_CTRL_DBUFERR) ? "DataBufErr " : "",
62 (status & TD_CTRL_BABBLE) ? "Babble " : "",
63 (status & TD_CTRL_NAK) ? "NAK " : "",
64 (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
65 (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
66 status & 0x7ff);
67
68 token = td_token(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", le32_to_cpu(td->buffer));
92
93 return out - buf;
94 }
95
96 static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
97 {
98 char *out = buf;
99 struct uhci_td *td;
100 int i, nactive, ninactive;
101 char *ptype;
102
103 if (len < 200)
104 return 0;
105
106 out += sprintf(out, "urb_priv [%p] ", urbp);
107 out += sprintf(out, "urb [%p] ", urbp->urb);
108 out += sprintf(out, "qh [%p] ", urbp->qh);
109 out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
110 out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
111 (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
112
113 switch (usb_pipetype(urbp->urb->pipe)) {
114 case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
115 case PIPE_INTERRUPT: ptype = "INT"; break;
116 case PIPE_BULK: ptype = "BLK"; break;
117 default:
118 case PIPE_CONTROL: ptype = "CTL"; break;
119 }
120
121 out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
122 out += sprintf(out, " Actlen=%d", urbp->urb->actual_length);
123
124 if (urbp->urb->status != -EINPROGRESS)
125 out += sprintf(out, " Status=%d", urbp->urb->status);
126 out += sprintf(out, "\n");
127
128 i = nactive = ninactive = 0;
129 list_for_each_entry(td, &urbp->td_list, list) {
130 if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC &&
131 (++i <= 10 || debug > 2)) {
132 out += sprintf(out, "%*s%d: ", space + 2, "", i);
133 out += uhci_show_td(td, out, len - (out - buf), 0);
134 } else {
135 if (td_status(td) & TD_CTRL_ACTIVE)
136 ++nactive;
137 else
138 ++ninactive;
139 }
140 }
141 if (nactive + ninactive > 0)
142 out += sprintf(out, "%*s[skipped %d inactive and %d active "
143 "TDs]\n",
144 space, "", ninactive, nactive);
145
146 return out - buf;
147 }
148
149 static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
150 {
151 char *out = buf;
152 int i, nurbs;
153 __le32 element = qh_element(qh);
154 char *qtype;
155
156 /* Try to make sure there's enough memory */
157 if (len < 80 * 7)
158 return 0;
159
160 switch (qh->type) {
161 case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
162 case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
163 case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
164 case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
165 default: qtype = "Skel" ; break;
166 }
167
168 out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
169 space, "", qh, qtype,
170 le32_to_cpu(qh->link), le32_to_cpu(element));
171 if (qh->type == USB_ENDPOINT_XFER_ISOC)
172 out += sprintf(out, "%*s period %d frame %x desc [%p]\n",
173 space, "", qh->period, qh->iso_frame,
174 qh->iso_packet_desc);
175
176 if (element & UHCI_PTR_QH)
177 out += sprintf(out, "%*s Element points to QH (bug?)\n", space, "");
178
179 if (element & UHCI_PTR_DEPTH)
180 out += sprintf(out, "%*s Depth traverse\n", space, "");
181
182 if (element & cpu_to_le32(8))
183 out += sprintf(out, "%*s Bit 3 set (bug?)\n", space, "");
184
185 if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH)))
186 out += sprintf(out, "%*s Element is NULL (bug?)\n", space, "");
187
188 if (list_empty(&qh->queue)) {
189 out += sprintf(out, "%*s queue is empty\n", space, "");
190 } else {
191 struct urb_priv *urbp = list_entry(qh->queue.next,
192 struct urb_priv, node);
193 struct uhci_td *td = list_entry(urbp->td_list.next,
194 struct uhci_td, list);
195
196 if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
197 out += sprintf(out, "%*s Element != First TD\n",
198 space, "");
199 i = nurbs = 0;
200 list_for_each_entry(urbp, &qh->queue, node) {
201 if (++i <= 10)
202 out += uhci_show_urbp(urbp, out,
203 len - (out - buf), space + 2);
204 else
205 ++nurbs;
206 }
207 if (nurbs > 0)
208 out += sprintf(out, "%*s Skipped %d URBs\n",
209 space, "", nurbs);
210 }
211
212 if (qh->udev) {
213 out += sprintf(out, "%*s Dummy TD\n", space, "");
214 out += uhci_show_td(qh->dummy_td, out, len - (out - buf), 0);
215 }
216
217 return out - buf;
218 }
219
220 static const char * const qh_names[] = {
221 "skel_unlink_qh", "skel_iso_qh",
222 "skel_int128_qh", "skel_int64_qh",
223 "skel_int32_qh", "skel_int16_qh",
224 "skel_int8_qh", "skel_int4_qh",
225 "skel_int2_qh", "skel_int1_qh",
226 "skel_ls_control_qh", "skel_fs_control_qh",
227 "skel_bulk_qh", "skel_term_qh"
228 };
229
230 static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
231 {
232 char *out = buf;
233
234 /* Try to make sure there's enough memory */
235 if (len < 160)
236 return 0;
237
238 out += sprintf(out, " stat%d = %04x %s%s%s%s%s%s%s%s%s%s\n",
239 port,
240 status,
241 (status & USBPORTSC_SUSP) ? " Suspend" : "",
242 (status & USBPORTSC_OCC) ? " OverCurrentChange" : "",
243 (status & USBPORTSC_OC) ? " OverCurrent" : "",
244 (status & USBPORTSC_PR) ? " Reset" : "",
245 (status & USBPORTSC_LSDA) ? " LowSpeed" : "",
246 (status & USBPORTSC_RD) ? " ResumeDetect" : "",
247 (status & USBPORTSC_PEC) ? " EnableChange" : "",
248 (status & USBPORTSC_PE) ? " Enabled" : "",
249 (status & USBPORTSC_CSC) ? " ConnectChange" : "",
250 (status & USBPORTSC_CCS) ? " Connected" : "");
251
252 return out - buf;
253 }
254
255 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len)
256 {
257 char *out = buf;
258 char *rh_state;
259
260 /* Try to make sure there's enough memory */
261 if (len < 60)
262 return 0;
263
264 switch (uhci->rh_state) {
265 case UHCI_RH_RESET:
266 rh_state = "reset"; break;
267 case UHCI_RH_SUSPENDED:
268 rh_state = "suspended"; break;
269 case UHCI_RH_AUTO_STOPPED:
270 rh_state = "auto-stopped"; break;
271 case UHCI_RH_RESUMING:
272 rh_state = "resuming"; break;
273 case UHCI_RH_SUSPENDING:
274 rh_state = "suspending"; break;
275 case UHCI_RH_RUNNING:
276 rh_state = "running"; break;
277 case UHCI_RH_RUNNING_NODEVS:
278 rh_state = "running, no devs"; break;
279 default:
280 rh_state = "?"; break;
281 }
282 out += sprintf(out, "Root-hub state: %s FSBR: %d\n",
283 rh_state, uhci->fsbr_is_on);
284 return out - buf;
285 }
286
287 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
288 {
289 char *out = buf;
290 unsigned long io_addr = uhci->io_addr;
291 unsigned short usbcmd, usbstat, usbint, usbfrnum;
292 unsigned int flbaseadd;
293 unsigned char sof;
294 unsigned short portsc1, portsc2;
295
296 /* Try to make sure there's enough memory */
297 if (len < 80 * 9)
298 return 0;
299
300 usbcmd = inw(io_addr + 0);
301 usbstat = inw(io_addr + 2);
302 usbint = inw(io_addr + 4);
303 usbfrnum = inw(io_addr + 6);
304 flbaseadd = inl(io_addr + 8);
305 sof = inb(io_addr + 12);
306 portsc1 = inw(io_addr + 16);
307 portsc2 = inw(io_addr + 18);
308
309 out += sprintf(out, " usbcmd = %04x %s%s%s%s%s%s%s%s\n",
310 usbcmd,
311 (usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
312 (usbcmd & USBCMD_CF) ? "CF " : "",
313 (usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
314 (usbcmd & USBCMD_FGR) ? "FGR " : "",
315 (usbcmd & USBCMD_EGSM) ? "EGSM " : "",
316 (usbcmd & USBCMD_GRESET) ? "GRESET " : "",
317 (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
318 (usbcmd & USBCMD_RS) ? "RS " : "");
319
320 out += sprintf(out, " usbstat = %04x %s%s%s%s%s%s\n",
321 usbstat,
322 (usbstat & USBSTS_HCH) ? "HCHalted " : "",
323 (usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
324 (usbstat & USBSTS_HSE) ? "HostSystemError " : "",
325 (usbstat & USBSTS_RD) ? "ResumeDetect " : "",
326 (usbstat & USBSTS_ERROR) ? "USBError " : "",
327 (usbstat & USBSTS_USBINT) ? "USBINT " : "");
328
329 out += sprintf(out, " usbint = %04x\n", usbint);
330 out += sprintf(out, " usbfrnum = (%d)%03x\n", (usbfrnum >> 10) & 1,
331 0xfff & (4*(unsigned int)usbfrnum));
332 out += sprintf(out, " flbaseadd = %08x\n", flbaseadd);
333 out += sprintf(out, " sof = %02x\n", sof);
334 out += uhci_show_sc(1, portsc1, out, len - (out - buf));
335 out += uhci_show_sc(2, portsc2, out, len - (out - buf));
336 out += sprintf(out, "Most recent frame: %x (%d) "
337 "Last ISO frame: %x (%d)\n",
338 uhci->frame_number, uhci->frame_number & 1023,
339 uhci->last_iso_frame, uhci->last_iso_frame & 1023);
340
341 return out - buf;
342 }
343
344 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
345 {
346 char *out = buf;
347 int i, j;
348 struct uhci_qh *qh;
349 struct uhci_td *td;
350 struct list_head *tmp, *head;
351
352 out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
353 out += sprintf(out, "HC status\n");
354 out += uhci_show_status(uhci, out, len - (out - buf));
355 if (debug <= 1)
356 return out - buf;
357
358 out += sprintf(out, "Frame List\n");
359 for (i = 0; i < UHCI_NUMFRAMES; ++i) {
360 td = uhci->frame_cpu[i];
361 if (!td)
362 continue;
363
364 out += sprintf(out, "- Frame %d\n", i); \
365 if (td->dma_handle != (dma_addr_t)uhci->frame[i])
366 out += sprintf(out, " frame list does not match td->dma_handle!\n");
367
368 head = &td->fl_list;
369 tmp = head;
370 do {
371 td = list_entry(tmp, struct uhci_td, fl_list);
372 tmp = tmp->next;
373 out += uhci_show_td(td, out, len - (out - buf), 4);
374 } while (tmp != head);
375 }
376
377 out += sprintf(out, "Skeleton QHs\n");
378
379 for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
380 int cnt = 0;
381
382 qh = uhci->skelqh[i];
383 out += sprintf(out, "- %s\n", qh_names[i]); \
384 out += uhci_show_qh(qh, out, len - (out - buf), 4);
385
386 /* Last QH is the Terminating QH, it's different */
387 if (i == UHCI_NUM_SKELQH - 1) {
388 if (qh->link != UHCI_PTR_TERM)
389 out += sprintf(out, " bandwidth reclamation on!\n");
390
391 if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle))
392 out += sprintf(out, " skel_term_qh element is not set to term_td!\n");
393
394 continue;
395 }
396
397 j = (i < 9) ? 9 : i+1; /* Next skeleton */
398 head = &qh->node;
399 tmp = head->next;
400
401 while (tmp != head) {
402 qh = list_entry(tmp, struct uhci_qh, node);
403 tmp = tmp->next;
404 if (++cnt <= 10)
405 out += uhci_show_qh(qh, out,
406 len - (out - buf), 4);
407 }
408 if ((cnt -= 10) > 0)
409 out += sprintf(out, " Skipped %d QHs\n", cnt);
410
411 if (i > 1 && i < UHCI_NUM_SKELQH - 1) {
412 if (qh->link !=
413 (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH))
414 out += sprintf(out, " last QH not linked to next skeleton!\n");
415 }
416 }
417
418 return out - buf;
419 }
420
421 #ifdef CONFIG_DEBUG_FS
422
423 #define MAX_OUTPUT (64 * 1024)
424
425 struct uhci_debug {
426 int size;
427 char *data;
428 };
429
430 static int uhci_debug_open(struct inode *inode, struct file *file)
431 {
432 struct uhci_hcd *uhci = inode->u.generic_ip;
433 struct uhci_debug *up;
434 int ret = -ENOMEM;
435 unsigned long flags;
436
437 lock_kernel();
438 up = kmalloc(sizeof(*up), GFP_KERNEL);
439 if (!up)
440 goto out;
441
442 up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
443 if (!up->data) {
444 kfree(up);
445 goto out;
446 }
447
448 up->size = 0;
449 spin_lock_irqsave(&uhci->lock, flags);
450 if (uhci->is_initialized)
451 up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT);
452 spin_unlock_irqrestore(&uhci->lock, flags);
453
454 file->private_data = up;
455
456 ret = 0;
457 out:
458 unlock_kernel();
459 return ret;
460 }
461
462 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
463 {
464 struct uhci_debug *up;
465 loff_t new = -1;
466
467 lock_kernel();
468 up = file->private_data;
469
470 switch (whence) {
471 case 0:
472 new = off;
473 break;
474 case 1:
475 new = file->f_pos + off;
476 break;
477 }
478 if (new < 0 || new > up->size) {
479 unlock_kernel();
480 return -EINVAL;
481 }
482 unlock_kernel();
483 return (file->f_pos = new);
484 }
485
486 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
487 size_t nbytes, loff_t *ppos)
488 {
489 struct uhci_debug *up = file->private_data;
490 return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
491 }
492
493 static int uhci_debug_release(struct inode *inode, struct file *file)
494 {
495 struct uhci_debug *up = file->private_data;
496
497 kfree(up->data);
498 kfree(up);
499
500 return 0;
501 }
502
503 #undef uhci_debug_operations
504 static struct file_operations uhci_debug_operations = {
505 .owner = THIS_MODULE,
506 .open = uhci_debug_open,
507 .llseek = uhci_debug_lseek,
508 .read = uhci_debug_read,
509 .release = uhci_debug_release,
510 };
511
512 #endif /* CONFIG_DEBUG_FS */
513
514 #else /* DEBUG */
515
516 static inline void lprintk(char *buf)
517 {}
518
519 static inline int uhci_show_qh(struct uhci_qh *qh, char *buf,
520 int len, int space)
521 {
522 return 0;
523 }
524
525 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
526 char *buf, int len)
527 {
528 return 0;
529 }
530
531 #endif
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