This source file includes following definitions.
- ohci_dump_intr_mask
- maybe_print_eds
- hcfs2string
- rh_state_string
- ohci_dump_status
- ohci_dump_roothub
- ohci_dump
- ohci_dump_td
- ohci_dump_ed
- show_list
- fill_async_buffer
- fill_periodic_buffer
- fill_registers_buffer
- alloc_buffer
- fill_buffer
- debug_output
- debug_close
- debug_async_open
- debug_periodic_open
- debug_registers_open
- create_debug_files
- remove_debug_files
1
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12
13 #define edstring(ed_type) ({ char *temp; \
14 switch (ed_type) { \
15 case PIPE_CONTROL: temp = "ctrl"; break; \
16 case PIPE_BULK: temp = "bulk"; break; \
17 case PIPE_INTERRUPT: temp = "intr"; break; \
18 default: temp = "isoc"; break; \
19 } temp;})
20 #define pipestring(pipe) edstring(usb_pipetype(pipe))
21
22
23 #define ohci_dbg_sw(ohci, next, size, format, arg...) \
24 do { \
25 if (next != NULL) { \
26 unsigned s_len; \
27 s_len = scnprintf (*next, *size, format, ## arg ); \
28 *size -= s_len; *next += s_len; \
29 } else \
30 ohci_dbg(ohci,format, ## arg ); \
31 } while (0);
32
33
34 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \
35 do { \
36 unsigned s_len; \
37 s_len = scnprintf(*next, *size, format, ## arg); \
38 *size -= s_len; *next += s_len; \
39 } while (0);
40
41
42 static void ohci_dump_intr_mask (
43 struct ohci_hcd *ohci,
44 char *label,
45 u32 mask,
46 char **next,
47 unsigned *size)
48 {
49 ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
50 label,
51 mask,
52 (mask & OHCI_INTR_MIE) ? " MIE" : "",
53 (mask & OHCI_INTR_OC) ? " OC" : "",
54 (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
55 (mask & OHCI_INTR_FNO) ? " FNO" : "",
56 (mask & OHCI_INTR_UE) ? " UE" : "",
57 (mask & OHCI_INTR_RD) ? " RD" : "",
58 (mask & OHCI_INTR_SF) ? " SF" : "",
59 (mask & OHCI_INTR_WDH) ? " WDH" : "",
60 (mask & OHCI_INTR_SO) ? " SO" : ""
61 );
62 }
63
64 static void maybe_print_eds (
65 struct ohci_hcd *ohci,
66 char *label,
67 u32 value,
68 char **next,
69 unsigned *size)
70 {
71 if (value)
72 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
73 }
74
75 static char *hcfs2string (int state)
76 {
77 switch (state) {
78 case OHCI_USB_RESET: return "reset";
79 case OHCI_USB_RESUME: return "resume";
80 case OHCI_USB_OPER: return "operational";
81 case OHCI_USB_SUSPEND: return "suspend";
82 }
83 return "?";
84 }
85
86 static const char *rh_state_string(struct ohci_hcd *ohci)
87 {
88 switch (ohci->rh_state) {
89 case OHCI_RH_HALTED:
90 return "halted";
91 case OHCI_RH_SUSPENDED:
92 return "suspended";
93 case OHCI_RH_RUNNING:
94 return "running";
95 }
96 return "?";
97 }
98
99
100 static void
101 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
102 {
103 struct ohci_regs __iomem *regs = controller->regs;
104 u32 temp;
105
106 temp = ohci_readl (controller, ®s->revision) & 0xff;
107 ohci_dbg_sw (controller, next, size,
108 "OHCI %d.%d, %s legacy support registers, rh state %s\n",
109 0x03 & (temp >> 4), (temp & 0x0f),
110 (temp & 0x0100) ? "with" : "NO",
111 rh_state_string(controller));
112
113 temp = ohci_readl (controller, ®s->control);
114 ohci_dbg_sw (controller, next, size,
115 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
116 temp,
117 (temp & OHCI_CTRL_RWE) ? " RWE" : "",
118 (temp & OHCI_CTRL_RWC) ? " RWC" : "",
119 (temp & OHCI_CTRL_IR) ? " IR" : "",
120 hcfs2string (temp & OHCI_CTRL_HCFS),
121 (temp & OHCI_CTRL_BLE) ? " BLE" : "",
122 (temp & OHCI_CTRL_CLE) ? " CLE" : "",
123 (temp & OHCI_CTRL_IE) ? " IE" : "",
124 (temp & OHCI_CTRL_PLE) ? " PLE" : "",
125 temp & OHCI_CTRL_CBSR
126 );
127
128 temp = ohci_readl (controller, ®s->cmdstatus);
129 ohci_dbg_sw (controller, next, size,
130 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
131 (temp & OHCI_SOC) >> 16,
132 (temp & OHCI_OCR) ? " OCR" : "",
133 (temp & OHCI_BLF) ? " BLF" : "",
134 (temp & OHCI_CLF) ? " CLF" : "",
135 (temp & OHCI_HCR) ? " HCR" : ""
136 );
137
138 ohci_dump_intr_mask (controller, "intrstatus",
139 ohci_readl (controller, ®s->intrstatus),
140 next, size);
141 ohci_dump_intr_mask (controller, "intrenable",
142 ohci_readl (controller, ®s->intrenable),
143 next, size);
144
145
146 maybe_print_eds (controller, "ed_periodcurrent",
147 ohci_readl (controller, ®s->ed_periodcurrent),
148 next, size);
149
150 maybe_print_eds (controller, "ed_controlhead",
151 ohci_readl (controller, ®s->ed_controlhead),
152 next, size);
153 maybe_print_eds (controller, "ed_controlcurrent",
154 ohci_readl (controller, ®s->ed_controlcurrent),
155 next, size);
156
157 maybe_print_eds (controller, "ed_bulkhead",
158 ohci_readl (controller, ®s->ed_bulkhead),
159 next, size);
160 maybe_print_eds (controller, "ed_bulkcurrent",
161 ohci_readl (controller, ®s->ed_bulkcurrent),
162 next, size);
163
164 maybe_print_eds (controller, "donehead",
165 ohci_readl (controller, ®s->donehead), next, size);
166 }
167
168 #define dbg_port_sw(hc,num,value,next,size) \
169 ohci_dbg_sw (hc, next, size, \
170 "roothub.portstatus [%d] " \
171 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
172 num, temp, \
173 (temp & RH_PS_PRSC) ? " PRSC" : "", \
174 (temp & RH_PS_OCIC) ? " OCIC" : "", \
175 (temp & RH_PS_PSSC) ? " PSSC" : "", \
176 (temp & RH_PS_PESC) ? " PESC" : "", \
177 (temp & RH_PS_CSC) ? " CSC" : "", \
178 \
179 (temp & RH_PS_LSDA) ? " LSDA" : "", \
180 (temp & RH_PS_PPS) ? " PPS" : "", \
181 (temp & RH_PS_PRS) ? " PRS" : "", \
182 (temp & RH_PS_POCI) ? " POCI" : "", \
183 (temp & RH_PS_PSS) ? " PSS" : "", \
184 \
185 (temp & RH_PS_PES) ? " PES" : "", \
186 (temp & RH_PS_CCS) ? " CCS" : "" \
187 );
188
189
190 static void
191 ohci_dump_roothub (
192 struct ohci_hcd *controller,
193 int verbose,
194 char **next,
195 unsigned *size)
196 {
197 u32 temp, i;
198
199 temp = roothub_a (controller);
200 if (temp == ~(u32)0)
201 return;
202
203 if (verbose) {
204 ohci_dbg_sw (controller, next, size,
205 "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
206 ((temp & RH_A_POTPGT) >> 24) & 0xff,
207 (temp & RH_A_NOCP) ? " NOCP" : "",
208 (temp & RH_A_OCPM) ? " OCPM" : "",
209 (temp & RH_A_DT) ? " DT" : "",
210 (temp & RH_A_NPS) ? " NPS" : "",
211 (temp & RH_A_PSM) ? " PSM" : "",
212 (temp & RH_A_NDP), controller->num_ports
213 );
214 temp = roothub_b (controller);
215 ohci_dbg_sw (controller, next, size,
216 "roothub.b %08x PPCM=%04x DR=%04x\n",
217 temp,
218 (temp & RH_B_PPCM) >> 16,
219 (temp & RH_B_DR)
220 );
221 temp = roothub_status (controller);
222 ohci_dbg_sw (controller, next, size,
223 "roothub.status %08x%s%s%s%s%s%s\n",
224 temp,
225 (temp & RH_HS_CRWE) ? " CRWE" : "",
226 (temp & RH_HS_OCIC) ? " OCIC" : "",
227 (temp & RH_HS_LPSC) ? " LPSC" : "",
228 (temp & RH_HS_DRWE) ? " DRWE" : "",
229 (temp & RH_HS_OCI) ? " OCI" : "",
230 (temp & RH_HS_LPS) ? " LPS" : ""
231 );
232 }
233
234 for (i = 0; i < controller->num_ports; i++) {
235 temp = roothub_portstatus (controller, i);
236 dbg_port_sw (controller, i, temp, next, size);
237 }
238 }
239
240 static void ohci_dump(struct ohci_hcd *controller)
241 {
242 ohci_dbg (controller, "OHCI controller state\n");
243
244
245 ohci_dump_status (controller, NULL, NULL);
246 if (controller->hcca)
247 ohci_dbg (controller,
248 "hcca frame #%04x\n", ohci_frame_no(controller));
249 ohci_dump_roothub (controller, 1, NULL, NULL);
250 }
251
252 static const char data0 [] = "DATA0";
253 static const char data1 [] = "DATA1";
254
255 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
256 const struct td *td)
257 {
258 u32 tmp = hc32_to_cpup (ohci, &td->hwINFO);
259
260 ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
261 label, td,
262 (tmp & TD_DONE) ? " (DONE)" : "",
263 td->urb, td->index,
264 hc32_to_cpup (ohci, &td->hwNextTD));
265 if ((tmp & TD_ISO) == 0) {
266 const char *toggle, *pid;
267 u32 cbp, be;
268
269 switch (tmp & TD_T) {
270 case TD_T_DATA0: toggle = data0; break;
271 case TD_T_DATA1: toggle = data1; break;
272 case TD_T_TOGGLE: toggle = "(CARRY)"; break;
273 default: toggle = "(?)"; break;
274 }
275 switch (tmp & TD_DP) {
276 case TD_DP_SETUP: pid = "SETUP"; break;
277 case TD_DP_IN: pid = "IN"; break;
278 case TD_DP_OUT: pid = "OUT"; break;
279 default: pid = "(bad pid)"; break;
280 }
281 ohci_dbg (ohci, " info %08x CC=%x %s DI=%d %s %s\n", tmp,
282 TD_CC_GET(tmp), toggle,
283 (tmp & TD_DI) >> 21, pid,
284 (tmp & TD_R) ? "R" : "");
285 cbp = hc32_to_cpup (ohci, &td->hwCBP);
286 be = hc32_to_cpup (ohci, &td->hwBE);
287 ohci_dbg (ohci, " cbp %08x be %08x (len %d)\n", cbp, be,
288 cbp ? (be + 1 - cbp) : 0);
289 } else {
290 unsigned i;
291 ohci_dbg (ohci, " info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
292 TD_CC_GET(tmp),
293 (tmp >> 24) & 0x07,
294 (tmp & TD_DI) >> 21,
295 tmp & 0x0000ffff);
296 ohci_dbg (ohci, " bp0 %08x be %08x\n",
297 hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
298 hc32_to_cpup (ohci, &td->hwBE));
299 for (i = 0; i < MAXPSW; i++) {
300 u16 psw = ohci_hwPSW (ohci, td, i);
301 int cc = (psw >> 12) & 0x0f;
302 ohci_dbg (ohci, " psw [%d] = %2x, CC=%x %s=%d\n", i,
303 psw, cc,
304 (cc >= 0x0e) ? "OFFSET" : "SIZE",
305 psw & 0x0fff);
306 }
307 }
308 }
309
310
311 static void __maybe_unused
312 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
313 const struct ed *ed, int verbose)
314 {
315 u32 tmp = hc32_to_cpu (ohci, ed->hwINFO);
316 char *type = "";
317
318 ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
319 label,
320 ed, ed->state, edstring (ed->type),
321 hc32_to_cpup (ohci, &ed->hwNextED));
322 switch (tmp & (ED_IN|ED_OUT)) {
323 case ED_OUT: type = "-OUT"; break;
324 case ED_IN: type = "-IN"; break;
325
326 }
327 ohci_dbg (ohci,
328 " info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
329 0x03ff & (tmp >> 16),
330 (tmp & ED_DEQUEUE) ? " DQ" : "",
331 (tmp & ED_ISO) ? " ISO" : "",
332 (tmp & ED_SKIP) ? " SKIP" : "",
333 (tmp & ED_LOWSPEED) ? " LOW" : "",
334 0x000f & (tmp >> 7),
335 type,
336 0x007f & tmp);
337 tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
338 ohci_dbg (ohci, " tds: head %08x %s%s tail %08x%s\n",
339 tmp,
340 (tmp & ED_C) ? data1 : data0,
341 (tmp & ED_H) ? " HALT" : "",
342 hc32_to_cpup (ohci, &ed->hwTailP),
343 verbose ? "" : " (not listing)");
344 if (verbose) {
345 struct list_head *tmp;
346
347
348
349
350 list_for_each (tmp, &ed->td_list) {
351 struct td *td;
352 td = list_entry (tmp, struct td, td_list);
353 ohci_dump_td (ohci, " ->", td);
354 }
355 }
356 }
357
358
359
360 static int debug_async_open(struct inode *, struct file *);
361 static int debug_periodic_open(struct inode *, struct file *);
362 static int debug_registers_open(struct inode *, struct file *);
363 static int debug_async_open(struct inode *, struct file *);
364 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
365 static int debug_close(struct inode *, struct file *);
366
367 static const struct file_operations debug_async_fops = {
368 .owner = THIS_MODULE,
369 .open = debug_async_open,
370 .read = debug_output,
371 .release = debug_close,
372 .llseek = default_llseek,
373 };
374 static const struct file_operations debug_periodic_fops = {
375 .owner = THIS_MODULE,
376 .open = debug_periodic_open,
377 .read = debug_output,
378 .release = debug_close,
379 .llseek = default_llseek,
380 };
381 static const struct file_operations debug_registers_fops = {
382 .owner = THIS_MODULE,
383 .open = debug_registers_open,
384 .read = debug_output,
385 .release = debug_close,
386 .llseek = default_llseek,
387 };
388
389 static struct dentry *ohci_debug_root;
390
391 struct debug_buffer {
392 ssize_t (*fill_func)(struct debug_buffer *);
393 struct ohci_hcd *ohci;
394 struct mutex mutex;
395 size_t count;
396 char *page;
397 };
398
399 static ssize_t
400 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
401 {
402 unsigned temp, size = count;
403
404 if (!ed)
405 return 0;
406
407
408 while (ed->ed_prev)
409 ed = ed->ed_prev;
410
411
412 while (ed) {
413 u32 info = hc32_to_cpu (ohci, ed->hwINFO);
414 u32 headp = hc32_to_cpu (ohci, ed->hwHeadP);
415 struct list_head *entry;
416 struct td *td;
417
418 temp = scnprintf (buf, size,
419 "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
420 ed,
421 (info & ED_LOWSPEED) ? 'l' : 'f',
422 info & 0x7f,
423 (info >> 7) & 0xf,
424 (info & ED_IN) ? "in" : "out",
425 0x03ff & (info >> 16),
426 info,
427 (info & ED_SKIP) ? " s" : "",
428 (headp & ED_H) ? " H" : "",
429 (headp & ED_C) ? data1 : data0);
430 size -= temp;
431 buf += temp;
432
433 list_for_each (entry, &ed->td_list) {
434 u32 cbp, be;
435
436 td = list_entry (entry, struct td, td_list);
437 info = hc32_to_cpup (ohci, &td->hwINFO);
438 cbp = hc32_to_cpup (ohci, &td->hwCBP);
439 be = hc32_to_cpup (ohci, &td->hwBE);
440 temp = scnprintf (buf, size,
441 "\n\ttd %p %s %d cc=%x urb %p (%08x)",
442 td,
443 ({ char *pid;
444 switch (info & TD_DP) {
445 case TD_DP_SETUP: pid = "setup"; break;
446 case TD_DP_IN: pid = "in"; break;
447 case TD_DP_OUT: pid = "out"; break;
448 default: pid = "(?)"; break;
449 } pid;}),
450 cbp ? (be + 1 - cbp) : 0,
451 TD_CC_GET (info), td->urb, info);
452 size -= temp;
453 buf += temp;
454 }
455
456 temp = scnprintf (buf, size, "\n");
457 size -= temp;
458 buf += temp;
459
460 ed = ed->ed_next;
461 }
462 return count - size;
463 }
464
465 static ssize_t fill_async_buffer(struct debug_buffer *buf)
466 {
467 struct ohci_hcd *ohci;
468 size_t temp, size;
469 unsigned long flags;
470
471 ohci = buf->ohci;
472 size = PAGE_SIZE;
473
474
475 spin_lock_irqsave (&ohci->lock, flags);
476 temp = show_list(ohci, buf->page, size, ohci->ed_controltail);
477 temp += show_list(ohci, buf->page + temp, size - temp,
478 ohci->ed_bulktail);
479 spin_unlock_irqrestore (&ohci->lock, flags);
480
481 return temp;
482 }
483
484 #define DBG_SCHED_LIMIT 64
485
486 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
487 {
488 struct ohci_hcd *ohci;
489 struct ed **seen, *ed;
490 unsigned long flags;
491 unsigned temp, size, seen_count;
492 char *next;
493 unsigned i;
494
495 seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC);
496 if (!seen)
497 return 0;
498 seen_count = 0;
499
500 ohci = buf->ohci;
501 next = buf->page;
502 size = PAGE_SIZE;
503
504 temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
505 size -= temp;
506 next += temp;
507
508
509 spin_lock_irqsave (&ohci->lock, flags);
510 for (i = 0; i < NUM_INTS; i++) {
511 ed = ohci->periodic[i];
512 if (!ed)
513 continue;
514
515 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
516 size -= temp;
517 next += temp;
518
519 do {
520 temp = scnprintf (next, size, " ed%d/%p",
521 ed->interval, ed);
522 size -= temp;
523 next += temp;
524 for (temp = 0; temp < seen_count; temp++) {
525 if (seen [temp] == ed)
526 break;
527 }
528
529
530 if (temp == seen_count) {
531 u32 info = hc32_to_cpu (ohci, ed->hwINFO);
532 struct list_head *entry;
533 unsigned qlen = 0;
534
535
536 list_for_each (entry, &ed->td_list)
537 qlen++;
538
539 temp = scnprintf (next, size,
540 " (%cs dev%d ep%d%s-%s qlen %u"
541 " max %d %08x%s%s)",
542 (info & ED_LOWSPEED) ? 'l' : 'f',
543 info & 0x7f,
544 (info >> 7) & 0xf,
545 (info & ED_IN) ? "in" : "out",
546 (info & ED_ISO) ? "iso" : "int",
547 qlen,
548 0x03ff & (info >> 16),
549 info,
550 (info & ED_SKIP) ? " K" : "",
551 (ed->hwHeadP &
552 cpu_to_hc32(ohci, ED_H)) ?
553 " H" : "");
554 size -= temp;
555 next += temp;
556
557 if (seen_count < DBG_SCHED_LIMIT)
558 seen [seen_count++] = ed;
559
560 ed = ed->ed_next;
561
562 } else {
563
564 temp = 0;
565 ed = NULL;
566 }
567
568 } while (ed);
569
570 temp = scnprintf (next, size, "\n");
571 size -= temp;
572 next += temp;
573 }
574 spin_unlock_irqrestore (&ohci->lock, flags);
575 kfree (seen);
576
577 return PAGE_SIZE - size;
578 }
579 #undef DBG_SCHED_LIMIT
580
581 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
582 {
583 struct usb_hcd *hcd;
584 struct ohci_hcd *ohci;
585 struct ohci_regs __iomem *regs;
586 unsigned long flags;
587 unsigned temp, size;
588 char *next;
589 u32 rdata;
590
591 ohci = buf->ohci;
592 hcd = ohci_to_hcd(ohci);
593 regs = ohci->regs;
594 next = buf->page;
595 size = PAGE_SIZE;
596
597 spin_lock_irqsave (&ohci->lock, flags);
598
599
600
601 ohci_dbg_nosw(ohci, &next, &size,
602 "bus %s, device %s\n"
603 "%s\n"
604 "%s\n",
605 hcd->self.controller->bus->name,
606 dev_name(hcd->self.controller),
607 hcd->product_desc,
608 hcd_name);
609
610 if (!HCD_HW_ACCESSIBLE(hcd)) {
611 size -= scnprintf (next, size,
612 "SUSPENDED (no register access)\n");
613 goto done;
614 }
615
616 ohci_dump_status(ohci, &next, &size);
617
618
619 if (ohci->hcca)
620 ohci_dbg_nosw(ohci, &next, &size,
621 "hcca frame 0x%04x\n", ohci_frame_no(ohci));
622
623
624 rdata = ohci_readl (ohci, ®s->fminterval);
625 temp = scnprintf (next, size,
626 "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
627 rdata, (rdata >> 31) ? "FIT " : "",
628 (rdata >> 16) & 0xefff, rdata & 0xffff);
629 size -= temp;
630 next += temp;
631
632 rdata = ohci_readl (ohci, ®s->fmremaining);
633 temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
634 rdata, (rdata >> 31) ? "FRT " : "",
635 rdata & 0x3fff);
636 size -= temp;
637 next += temp;
638
639 rdata = ohci_readl (ohci, ®s->periodicstart);
640 temp = scnprintf (next, size, "periodicstart 0x%04x\n",
641 rdata & 0x3fff);
642 size -= temp;
643 next += temp;
644
645 rdata = ohci_readl (ohci, ®s->lsthresh);
646 temp = scnprintf (next, size, "lsthresh 0x%04x\n",
647 rdata & 0x3fff);
648 size -= temp;
649 next += temp;
650
651 temp = scnprintf (next, size, "hub poll timer %s\n",
652 HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off");
653 size -= temp;
654 next += temp;
655
656
657 ohci_dump_roothub (ohci, 1, &next, &size);
658
659 done:
660 spin_unlock_irqrestore (&ohci->lock, flags);
661
662 return PAGE_SIZE - size;
663 }
664
665 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
666 ssize_t (*fill_func)(struct debug_buffer *))
667 {
668 struct debug_buffer *buf;
669
670 buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
671
672 if (buf) {
673 buf->ohci = ohci;
674 buf->fill_func = fill_func;
675 mutex_init(&buf->mutex);
676 }
677
678 return buf;
679 }
680
681 static int fill_buffer(struct debug_buffer *buf)
682 {
683 int ret = 0;
684
685 if (!buf->page)
686 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
687
688 if (!buf->page) {
689 ret = -ENOMEM;
690 goto out;
691 }
692
693 ret = buf->fill_func(buf);
694
695 if (ret >= 0) {
696 buf->count = ret;
697 ret = 0;
698 }
699
700 out:
701 return ret;
702 }
703
704 static ssize_t debug_output(struct file *file, char __user *user_buf,
705 size_t len, loff_t *offset)
706 {
707 struct debug_buffer *buf = file->private_data;
708 int ret = 0;
709
710 mutex_lock(&buf->mutex);
711 if (buf->count == 0) {
712 ret = fill_buffer(buf);
713 if (ret != 0) {
714 mutex_unlock(&buf->mutex);
715 goto out;
716 }
717 }
718 mutex_unlock(&buf->mutex);
719
720 ret = simple_read_from_buffer(user_buf, len, offset,
721 buf->page, buf->count);
722
723 out:
724 return ret;
725
726 }
727
728 static int debug_close(struct inode *inode, struct file *file)
729 {
730 struct debug_buffer *buf = file->private_data;
731
732 if (buf) {
733 if (buf->page)
734 free_page((unsigned long)buf->page);
735 kfree(buf);
736 }
737
738 return 0;
739 }
740 static int debug_async_open(struct inode *inode, struct file *file)
741 {
742 file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
743
744 return file->private_data ? 0 : -ENOMEM;
745 }
746
747 static int debug_periodic_open(struct inode *inode, struct file *file)
748 {
749 file->private_data = alloc_buffer(inode->i_private,
750 fill_periodic_buffer);
751
752 return file->private_data ? 0 : -ENOMEM;
753 }
754
755 static int debug_registers_open(struct inode *inode, struct file *file)
756 {
757 file->private_data = alloc_buffer(inode->i_private,
758 fill_registers_buffer);
759
760 return file->private_data ? 0 : -ENOMEM;
761 }
762 static inline void create_debug_files (struct ohci_hcd *ohci)
763 {
764 struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
765 struct dentry *root;
766
767 root = debugfs_create_dir(bus->bus_name, ohci_debug_root);
768 ohci->debug_dir = root;
769
770 debugfs_create_file("async", S_IRUGO, root, ohci, &debug_async_fops);
771 debugfs_create_file("periodic", S_IRUGO, root, ohci,
772 &debug_periodic_fops);
773 debugfs_create_file("registers", S_IRUGO, root, ohci,
774 &debug_registers_fops);
775
776 ohci_dbg (ohci, "created debug files\n");
777 }
778
779 static inline void remove_debug_files (struct ohci_hcd *ohci)
780 {
781 debugfs_remove_recursive(ohci->debug_dir);
782 }
783
784
785