Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
[linux-2.6] / drivers / usb / host / ohci-dbg.c
1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  *
4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6  *
7  * This file is licenced under the GPL.
8  */
9
10 /*-------------------------------------------------------------------------*/
11
12 #ifdef DEBUG
13
14 #define edstring(ed_type) ({ char *temp; \
15         switch (ed_type) { \
16         case PIPE_CONTROL:      temp = "ctrl"; break; \
17         case PIPE_BULK:         temp = "bulk"; break; \
18         case PIPE_INTERRUPT:    temp = "intr"; break; \
19         default:                temp = "isoc"; break; \
20         }; temp;})
21 #define pipestring(pipe) edstring(usb_pipetype(pipe))
22
23 /* debug| print the main components of an URB
24  * small: 0) header + data packets 1) just header
25  */
26 static void __maybe_unused
27 urb_print(struct urb * urb, char * str, int small, int status)
28 {
29         unsigned int pipe= urb->pipe;
30
31         if (!urb->dev || !urb->dev->bus) {
32                 dbg("%s URB: no dev", str);
33                 return;
34         }
35
36 #ifndef OHCI_VERBOSE_DEBUG
37         if (status != 0)
38 #endif
39         dbg("%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d",
40                     str,
41                     urb,
42                     usb_pipedevice (pipe),
43                     usb_pipeendpoint (pipe),
44                     usb_pipeout (pipe)? "out" : "in",
45                     pipestring (pipe),
46                     urb->transfer_flags,
47                     urb->actual_length,
48                     urb->transfer_buffer_length,
49                     status);
50
51 #ifdef  OHCI_VERBOSE_DEBUG
52         if (!small) {
53                 int i, len;
54
55                 if (usb_pipecontrol (pipe)) {
56                         printk (KERN_DEBUG __FILE__ ": setup(8):");
57                         for (i = 0; i < 8 ; i++)
58                                 printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
59                         printk ("\n");
60                 }
61                 if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
62                         printk (KERN_DEBUG __FILE__ ": data(%d/%d):",
63                                 urb->actual_length,
64                                 urb->transfer_buffer_length);
65                         len = usb_pipeout (pipe)?
66                                                 urb->transfer_buffer_length: urb->actual_length;
67                         for (i = 0; i < 16 && i < len; i++)
68                                 printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
69                         printk ("%s stat:%d\n", i < len? "...": "", status);
70                 }
71         }
72 #endif
73 }
74
75 #define ohci_dbg_sw(ohci, next, size, format, arg...) \
76         do { \
77         if (next != NULL) { \
78                 unsigned s_len; \
79                 s_len = scnprintf (*next, *size, format, ## arg ); \
80                 *size -= s_len; *next += s_len; \
81         } else \
82                 ohci_dbg(ohci,format, ## arg ); \
83         } while (0);
84
85
86 static void ohci_dump_intr_mask (
87         struct ohci_hcd *ohci,
88         char *label,
89         u32 mask,
90         char **next,
91         unsigned *size)
92 {
93         ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
94                 label,
95                 mask,
96                 (mask & OHCI_INTR_MIE) ? " MIE" : "",
97                 (mask & OHCI_INTR_OC) ? " OC" : "",
98                 (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
99                 (mask & OHCI_INTR_FNO) ? " FNO" : "",
100                 (mask & OHCI_INTR_UE) ? " UE" : "",
101                 (mask & OHCI_INTR_RD) ? " RD" : "",
102                 (mask & OHCI_INTR_SF) ? " SF" : "",
103                 (mask & OHCI_INTR_WDH) ? " WDH" : "",
104                 (mask & OHCI_INTR_SO) ? " SO" : ""
105                 );
106 }
107
108 static void maybe_print_eds (
109         struct ohci_hcd *ohci,
110         char *label,
111         u32 value,
112         char **next,
113         unsigned *size)
114 {
115         if (value)
116                 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
117 }
118
119 static char *hcfs2string (int state)
120 {
121         switch (state) {
122                 case OHCI_USB_RESET:    return "reset";
123                 case OHCI_USB_RESUME:   return "resume";
124                 case OHCI_USB_OPER:     return "operational";
125                 case OHCI_USB_SUSPEND:  return "suspend";
126         }
127         return "?";
128 }
129
130 // dump control and status registers
131 static void
132 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
133 {
134         struct ohci_regs __iomem *regs = controller->regs;
135         u32                     temp;
136
137         temp = ohci_readl (controller, &regs->revision) & 0xff;
138         ohci_dbg_sw (controller, next, size,
139                 "OHCI %d.%d, %s legacy support registers\n",
140                 0x03 & (temp >> 4), (temp & 0x0f),
141                 (temp & 0x0100) ? "with" : "NO");
142
143         temp = ohci_readl (controller, &regs->control);
144         ohci_dbg_sw (controller, next, size,
145                 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
146                 temp,
147                 (temp & OHCI_CTRL_RWE) ? " RWE" : "",
148                 (temp & OHCI_CTRL_RWC) ? " RWC" : "",
149                 (temp & OHCI_CTRL_IR) ? " IR" : "",
150                 hcfs2string (temp & OHCI_CTRL_HCFS),
151                 (temp & OHCI_CTRL_BLE) ? " BLE" : "",
152                 (temp & OHCI_CTRL_CLE) ? " CLE" : "",
153                 (temp & OHCI_CTRL_IE) ? " IE" : "",
154                 (temp & OHCI_CTRL_PLE) ? " PLE" : "",
155                 temp & OHCI_CTRL_CBSR
156                 );
157
158         temp = ohci_readl (controller, &regs->cmdstatus);
159         ohci_dbg_sw (controller, next, size,
160                 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
161                 (temp & OHCI_SOC) >> 16,
162                 (temp & OHCI_OCR) ? " OCR" : "",
163                 (temp & OHCI_BLF) ? " BLF" : "",
164                 (temp & OHCI_CLF) ? " CLF" : "",
165                 (temp & OHCI_HCR) ? " HCR" : ""
166                 );
167
168         ohci_dump_intr_mask (controller, "intrstatus",
169                         ohci_readl (controller, &regs->intrstatus),
170                         next, size);
171         ohci_dump_intr_mask (controller, "intrenable",
172                         ohci_readl (controller, &regs->intrenable),
173                         next, size);
174         // intrdisable always same as intrenable
175
176         maybe_print_eds (controller, "ed_periodcurrent",
177                         ohci_readl (controller, &regs->ed_periodcurrent),
178                         next, size);
179
180         maybe_print_eds (controller, "ed_controlhead",
181                         ohci_readl (controller, &regs->ed_controlhead),
182                         next, size);
183         maybe_print_eds (controller, "ed_controlcurrent",
184                         ohci_readl (controller, &regs->ed_controlcurrent),
185                         next, size);
186
187         maybe_print_eds (controller, "ed_bulkhead",
188                         ohci_readl (controller, &regs->ed_bulkhead),
189                         next, size);
190         maybe_print_eds (controller, "ed_bulkcurrent",
191                         ohci_readl (controller, &regs->ed_bulkcurrent),
192                         next, size);
193
194         maybe_print_eds (controller, "donehead",
195                         ohci_readl (controller, &regs->donehead), next, size);
196 }
197
198 #define dbg_port_sw(hc,num,value,next,size) \
199         ohci_dbg_sw (hc, next, size, \
200                 "roothub.portstatus [%d] " \
201                 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
202                 num, temp, \
203                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
204                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
205                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
206                 (temp & RH_PS_PESC) ? " PESC" : "", \
207                 (temp & RH_PS_CSC) ? " CSC" : "", \
208                 \
209                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
210                 (temp & RH_PS_PPS) ? " PPS" : "", \
211                 (temp & RH_PS_PRS) ? " PRS" : "", \
212                 (temp & RH_PS_POCI) ? " POCI" : "", \
213                 (temp & RH_PS_PSS) ? " PSS" : "", \
214                 \
215                 (temp & RH_PS_PES) ? " PES" : "", \
216                 (temp & RH_PS_CCS) ? " CCS" : "" \
217                 );
218
219
220 static void
221 ohci_dump_roothub (
222         struct ohci_hcd *controller,
223         int verbose,
224         char **next,
225         unsigned *size)
226 {
227         u32                     temp, i;
228
229         temp = roothub_a (controller);
230         if (temp == ~(u32)0)
231                 return;
232
233         if (verbose) {
234                 ohci_dbg_sw (controller, next, size,
235                         "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
236                         ((temp & RH_A_POTPGT) >> 24) & 0xff,
237                         (temp & RH_A_NOCP) ? " NOCP" : "",
238                         (temp & RH_A_OCPM) ? " OCPM" : "",
239                         (temp & RH_A_DT) ? " DT" : "",
240                         (temp & RH_A_NPS) ? " NPS" : "",
241                         (temp & RH_A_PSM) ? " PSM" : "",
242                         (temp & RH_A_NDP), controller->num_ports
243                         );
244                 temp = roothub_b (controller);
245                 ohci_dbg_sw (controller, next, size,
246                         "roothub.b %08x PPCM=%04x DR=%04x\n",
247                         temp,
248                         (temp & RH_B_PPCM) >> 16,
249                         (temp & RH_B_DR)
250                         );
251                 temp = roothub_status (controller);
252                 ohci_dbg_sw (controller, next, size,
253                         "roothub.status %08x%s%s%s%s%s%s\n",
254                         temp,
255                         (temp & RH_HS_CRWE) ? " CRWE" : "",
256                         (temp & RH_HS_OCIC) ? " OCIC" : "",
257                         (temp & RH_HS_LPSC) ? " LPSC" : "",
258                         (temp & RH_HS_DRWE) ? " DRWE" : "",
259                         (temp & RH_HS_OCI) ? " OCI" : "",
260                         (temp & RH_HS_LPS) ? " LPS" : ""
261                         );
262         }
263
264         for (i = 0; i < controller->num_ports; i++) {
265                 temp = roothub_portstatus (controller, i);
266                 dbg_port_sw (controller, i, temp, next, size);
267         }
268 }
269
270 static void ohci_dump (struct ohci_hcd *controller, int verbose)
271 {
272         ohci_dbg (controller, "OHCI controller state\n");
273
274         // dumps some of the state we know about
275         ohci_dump_status (controller, NULL, NULL);
276         if (controller->hcca)
277                 ohci_dbg (controller,
278                         "hcca frame #%04x\n", ohci_frame_no(controller));
279         ohci_dump_roothub (controller, 1, NULL, NULL);
280 }
281
282 static const char data0 [] = "DATA0";
283 static const char data1 [] = "DATA1";
284
285 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
286                 const struct td *td)
287 {
288         u32     tmp = hc32_to_cpup (ohci, &td->hwINFO);
289
290         ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
291                 label, td,
292                 (tmp & TD_DONE) ? " (DONE)" : "",
293                 td->urb, td->index,
294                 hc32_to_cpup (ohci, &td->hwNextTD));
295         if ((tmp & TD_ISO) == 0) {
296                 const char      *toggle, *pid;
297                 u32     cbp, be;
298
299                 switch (tmp & TD_T) {
300                 case TD_T_DATA0: toggle = data0; break;
301                 case TD_T_DATA1: toggle = data1; break;
302                 case TD_T_TOGGLE: toggle = "(CARRY)"; break;
303                 default: toggle = "(?)"; break;
304                 }
305                 switch (tmp & TD_DP) {
306                 case TD_DP_SETUP: pid = "SETUP"; break;
307                 case TD_DP_IN: pid = "IN"; break;
308                 case TD_DP_OUT: pid = "OUT"; break;
309                 default: pid = "(bad pid)"; break;
310                 }
311                 ohci_dbg (ohci, "     info %08x CC=%x %s DI=%d %s %s\n", tmp,
312                         TD_CC_GET(tmp), /* EC, */ toggle,
313                         (tmp & TD_DI) >> 21, pid,
314                         (tmp & TD_R) ? "R" : "");
315                 cbp = hc32_to_cpup (ohci, &td->hwCBP);
316                 be = hc32_to_cpup (ohci, &td->hwBE);
317                 ohci_dbg (ohci, "     cbp %08x be %08x (len %d)\n", cbp, be,
318                         cbp ? (be + 1 - cbp) : 0);
319         } else {
320                 unsigned        i;
321                 ohci_dbg (ohci, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
322                         TD_CC_GET(tmp),
323                         (tmp >> 24) & 0x07,
324                         (tmp & TD_DI) >> 21,
325                         tmp & 0x0000ffff);
326                 ohci_dbg (ohci, "  bp0 %08x be %08x\n",
327                         hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
328                         hc32_to_cpup (ohci, &td->hwBE));
329                 for (i = 0; i < MAXPSW; i++) {
330                         u16     psw = ohci_hwPSW (ohci, td, i);
331                         int     cc = (psw >> 12) & 0x0f;
332                         ohci_dbg (ohci, "    psw [%d] = %2x, CC=%x %s=%d\n", i,
333                                 psw, cc,
334                                 (cc >= 0x0e) ? "OFFSET" : "SIZE",
335                                 psw & 0x0fff);
336                 }
337         }
338 }
339
340 /* caller MUST own hcd spinlock if verbose is set! */
341 static void __maybe_unused
342 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
343                 const struct ed *ed, int verbose)
344 {
345         u32     tmp = hc32_to_cpu (ohci, ed->hwINFO);
346         char    *type = "";
347
348         ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
349                 label,
350                 ed, ed->state, edstring (ed->type),
351                 hc32_to_cpup (ohci, &ed->hwNextED));
352         switch (tmp & (ED_IN|ED_OUT)) {
353         case ED_OUT: type = "-OUT"; break;
354         case ED_IN: type = "-IN"; break;
355         /* else from TDs ... control */
356         }
357         ohci_dbg (ohci,
358                 "  info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
359                 0x03ff & (tmp >> 16),
360                 (tmp & ED_DEQUEUE) ? " DQ" : "",
361                 (tmp & ED_ISO) ? " ISO" : "",
362                 (tmp & ED_SKIP) ? " SKIP" : "",
363                 (tmp & ED_LOWSPEED) ? " LOW" : "",
364                 0x000f & (tmp >> 7),
365                 type,
366                 0x007f & tmp);
367         tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
368         ohci_dbg (ohci, "  tds: head %08x %s%s tail %08x%s\n",
369                 tmp,
370                 (tmp & ED_C) ? data1 : data0,
371                 (tmp & ED_H) ? " HALT" : "",
372                 hc32_to_cpup (ohci, &ed->hwTailP),
373                 verbose ? "" : " (not listing)");
374         if (verbose) {
375                 struct list_head        *tmp;
376
377                 /* use ed->td_list because HC concurrently modifies
378                  * hwNextTD as it accumulates ed_donelist.
379                  */
380                 list_for_each (tmp, &ed->td_list) {
381                         struct td               *td;
382                         td = list_entry (tmp, struct td, td_list);
383                         ohci_dump_td (ohci, "  ->", td);
384                 }
385         }
386 }
387
388 #else
389 static inline void ohci_dump (struct ohci_hcd *controller, int verbose) {}
390
391 #undef OHCI_VERBOSE_DEBUG
392
393 #endif /* DEBUG */
394
395 /*-------------------------------------------------------------------------*/
396
397 #ifdef STUB_DEBUG_FILES
398
399 static inline void create_debug_files (struct ohci_hcd *bus) { }
400 static inline void remove_debug_files (struct ohci_hcd *bus) { }
401
402 #else
403
404 static int debug_async_open(struct inode *, struct file *);
405 static int debug_periodic_open(struct inode *, struct file *);
406 static int debug_registers_open(struct inode *, struct file *);
407 static int debug_async_open(struct inode *, struct file *);
408 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
409 static int debug_close(struct inode *, struct file *);
410
411 static const struct file_operations debug_async_fops = {
412         .owner          = THIS_MODULE,
413         .open           = debug_async_open,
414         .read           = debug_output,
415         .release        = debug_close,
416 };
417 static const struct file_operations debug_periodic_fops = {
418         .owner          = THIS_MODULE,
419         .open           = debug_periodic_open,
420         .read           = debug_output,
421         .release        = debug_close,
422 };
423 static const struct file_operations debug_registers_fops = {
424         .owner          = THIS_MODULE,
425         .open           = debug_registers_open,
426         .read           = debug_output,
427         .release        = debug_close,
428 };
429
430 static struct dentry *ohci_debug_root;
431
432 struct debug_buffer {
433         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
434         struct device *dev;
435         struct mutex mutex;     /* protect filling of buffer */
436         size_t count;           /* number of characters filled into buffer */
437         char *page;
438 };
439
440 static ssize_t
441 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
442 {
443         unsigned                temp, size = count;
444
445         if (!ed)
446                 return 0;
447
448         /* print first --> last */
449         while (ed->ed_prev)
450                 ed = ed->ed_prev;
451
452         /* dump a snapshot of the bulk or control schedule */
453         while (ed) {
454                 u32             info = hc32_to_cpu (ohci, ed->hwINFO);
455                 u32             headp = hc32_to_cpu (ohci, ed->hwHeadP);
456                 struct list_head *entry;
457                 struct td       *td;
458
459                 temp = scnprintf (buf, size,
460                         "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
461                         ed,
462                         (info & ED_LOWSPEED) ? 'l' : 'f',
463                         info & 0x7f,
464                         (info >> 7) & 0xf,
465                         (info & ED_IN) ? "in" : "out",
466                         0x03ff & (info >> 16),
467                         info,
468                         (info & ED_SKIP) ? " s" : "",
469                         (headp & ED_H) ? " H" : "",
470                         (headp & ED_C) ? data1 : data0);
471                 size -= temp;
472                 buf += temp;
473
474                 list_for_each (entry, &ed->td_list) {
475                         u32             cbp, be;
476
477                         td = list_entry (entry, struct td, td_list);
478                         info = hc32_to_cpup (ohci, &td->hwINFO);
479                         cbp = hc32_to_cpup (ohci, &td->hwCBP);
480                         be = hc32_to_cpup (ohci, &td->hwBE);
481                         temp = scnprintf (buf, size,
482                                         "\n\ttd %p %s %d cc=%x urb %p (%08x)",
483                                         td,
484                                         ({ char *pid;
485                                         switch (info & TD_DP) {
486                                         case TD_DP_SETUP: pid = "setup"; break;
487                                         case TD_DP_IN: pid = "in"; break;
488                                         case TD_DP_OUT: pid = "out"; break;
489                                         default: pid = "(?)"; break;
490                                          } pid;}),
491                                         cbp ? (be + 1 - cbp) : 0,
492                                         TD_CC_GET (info), td->urb, info);
493                         size -= temp;
494                         buf += temp;
495                 }
496
497                 temp = scnprintf (buf, size, "\n");
498                 size -= temp;
499                 buf += temp;
500
501                 ed = ed->ed_next;
502         }
503         return count - size;
504 }
505
506 static ssize_t fill_async_buffer(struct debug_buffer *buf)
507 {
508         struct usb_bus          *bus;
509         struct usb_hcd          *hcd;
510         struct ohci_hcd         *ohci;
511         size_t                  temp;
512         unsigned long           flags;
513
514         bus = dev_get_drvdata(buf->dev);
515         hcd = bus_to_hcd(bus);
516         ohci = hcd_to_ohci(hcd);
517
518         /* display control and bulk lists together, for simplicity */
519         spin_lock_irqsave (&ohci->lock, flags);
520         temp = show_list(ohci, buf->page, buf->count, ohci->ed_controltail);
521         temp += show_list(ohci, buf->page + temp, buf->count - temp,
522                           ohci->ed_bulktail);
523         spin_unlock_irqrestore (&ohci->lock, flags);
524
525         return temp;
526 }
527
528 #define DBG_SCHED_LIMIT 64
529
530 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
531 {
532         struct usb_bus          *bus;
533         struct usb_hcd          *hcd;
534         struct ohci_hcd         *ohci;
535         struct ed               **seen, *ed;
536         unsigned long           flags;
537         unsigned                temp, size, seen_count;
538         char                    *next;
539         unsigned                i;
540
541         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
542                 return 0;
543         seen_count = 0;
544
545         bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
546         hcd = bus_to_hcd(bus);
547         ohci = hcd_to_ohci(hcd);
548         next = buf->page;
549         size = PAGE_SIZE;
550
551         temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
552         size -= temp;
553         next += temp;
554
555         /* dump a snapshot of the periodic schedule (and load) */
556         spin_lock_irqsave (&ohci->lock, flags);
557         for (i = 0; i < NUM_INTS; i++) {
558                 if (!(ed = ohci->periodic [i]))
559                         continue;
560
561                 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
562                 size -= temp;
563                 next += temp;
564
565                 do {
566                         temp = scnprintf (next, size, " ed%d/%p",
567                                 ed->interval, ed);
568                         size -= temp;
569                         next += temp;
570                         for (temp = 0; temp < seen_count; temp++) {
571                                 if (seen [temp] == ed)
572                                         break;
573                         }
574
575                         /* show more info the first time around */
576                         if (temp == seen_count) {
577                                 u32     info = hc32_to_cpu (ohci, ed->hwINFO);
578                                 struct list_head        *entry;
579                                 unsigned                qlen = 0;
580
581                                 /* qlen measured here in TDs, not urbs */
582                                 list_for_each (entry, &ed->td_list)
583                                         qlen++;
584
585                                 temp = scnprintf (next, size,
586                                         " (%cs dev%d ep%d%s-%s qlen %u"
587                                         " max %d %08x%s%s)",
588                                         (info & ED_LOWSPEED) ? 'l' : 'f',
589                                         info & 0x7f,
590                                         (info >> 7) & 0xf,
591                                         (info & ED_IN) ? "in" : "out",
592                                         (info & ED_ISO) ? "iso" : "int",
593                                         qlen,
594                                         0x03ff & (info >> 16),
595                                         info,
596                                         (info & ED_SKIP) ? " K" : "",
597                                         (ed->hwHeadP &
598                                                 cpu_to_hc32(ohci, ED_H)) ?
599                                                         " H" : "");
600                                 size -= temp;
601                                 next += temp;
602
603                                 if (seen_count < DBG_SCHED_LIMIT)
604                                         seen [seen_count++] = ed;
605
606                                 ed = ed->ed_next;
607
608                         } else {
609                                 /* we've seen it and what's after */
610                                 temp = 0;
611                                 ed = NULL;
612                         }
613
614                 } while (ed);
615
616                 temp = scnprintf (next, size, "\n");
617                 size -= temp;
618                 next += temp;
619         }
620         spin_unlock_irqrestore (&ohci->lock, flags);
621         kfree (seen);
622
623         return PAGE_SIZE - size;
624 }
625 #undef DBG_SCHED_LIMIT
626
627 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
628 {
629         struct usb_bus          *bus;
630         struct usb_hcd          *hcd;
631         struct ohci_hcd         *ohci;
632         struct ohci_regs __iomem *regs;
633         unsigned long           flags;
634         unsigned                temp, size;
635         char                    *next;
636         u32                     rdata;
637
638         bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
639         hcd = bus_to_hcd(bus);
640         ohci = hcd_to_ohci(hcd);
641         regs = ohci->regs;
642         next = buf->page;
643         size = PAGE_SIZE;
644
645         spin_lock_irqsave (&ohci->lock, flags);
646
647         /* dump driver info, then registers in spec order */
648
649         ohci_dbg_sw (ohci, &next, &size,
650                 "bus %s, device %s\n"
651                 "%s\n"
652                 "%s version " DRIVER_VERSION "\n",
653                 hcd->self.controller->bus->name,
654                 dev_name(hcd->self.controller),
655                 hcd->product_desc,
656                 hcd_name);
657
658         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
659                 size -= scnprintf (next, size,
660                         "SUSPENDED (no register access)\n");
661                 goto done;
662         }
663
664         ohci_dump_status(ohci, &next, &size);
665
666         /* hcca */
667         if (ohci->hcca)
668                 ohci_dbg_sw (ohci, &next, &size,
669                         "hcca frame 0x%04x\n", ohci_frame_no(ohci));
670
671         /* other registers mostly affect frame timings */
672         rdata = ohci_readl (ohci, &regs->fminterval);
673         temp = scnprintf (next, size,
674                         "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
675                         rdata, (rdata >> 31) ? "FIT " : "",
676                         (rdata >> 16) & 0xefff, rdata & 0xffff);
677         size -= temp;
678         next += temp;
679
680         rdata = ohci_readl (ohci, &regs->fmremaining);
681         temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
682                         rdata, (rdata >> 31) ? "FRT " : "",
683                         rdata & 0x3fff);
684         size -= temp;
685         next += temp;
686
687         rdata = ohci_readl (ohci, &regs->periodicstart);
688         temp = scnprintf (next, size, "periodicstart 0x%04x\n",
689                         rdata & 0x3fff);
690         size -= temp;
691         next += temp;
692
693         rdata = ohci_readl (ohci, &regs->lsthresh);
694         temp = scnprintf (next, size, "lsthresh 0x%04x\n",
695                         rdata & 0x3fff);
696         size -= temp;
697         next += temp;
698
699         temp = scnprintf (next, size, "hub poll timer %s\n",
700                         ohci_to_hcd(ohci)->poll_rh ? "ON" : "off");
701         size -= temp;
702         next += temp;
703
704         /* roothub */
705         ohci_dump_roothub (ohci, 1, &next, &size);
706
707 done:
708         spin_unlock_irqrestore (&ohci->lock, flags);
709
710         return PAGE_SIZE - size;
711 }
712
713 static struct debug_buffer *alloc_buffer(struct device *dev,
714                                 ssize_t (*fill_func)(struct debug_buffer *))
715 {
716         struct debug_buffer *buf;
717
718         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
719
720         if (buf) {
721                 buf->dev = dev;
722                 buf->fill_func = fill_func;
723                 mutex_init(&buf->mutex);
724         }
725
726         return buf;
727 }
728
729 static int fill_buffer(struct debug_buffer *buf)
730 {
731         int ret = 0;
732
733         if (!buf->page)
734                 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
735
736         if (!buf->page) {
737                 ret = -ENOMEM;
738                 goto out;
739         }
740
741         ret = buf->fill_func(buf);
742
743         if (ret >= 0) {
744                 buf->count = ret;
745                 ret = 0;
746         }
747
748 out:
749         return ret;
750 }
751
752 static ssize_t debug_output(struct file *file, char __user *user_buf,
753                         size_t len, loff_t *offset)
754 {
755         struct debug_buffer *buf = file->private_data;
756         int ret = 0;
757
758         mutex_lock(&buf->mutex);
759         if (buf->count == 0) {
760                 ret = fill_buffer(buf);
761                 if (ret != 0) {
762                         mutex_unlock(&buf->mutex);
763                         goto out;
764                 }
765         }
766         mutex_unlock(&buf->mutex);
767
768         ret = simple_read_from_buffer(user_buf, len, offset,
769                                       buf->page, buf->count);
770
771 out:
772         return ret;
773
774 }
775
776 static int debug_close(struct inode *inode, struct file *file)
777 {
778         struct debug_buffer *buf = file->private_data;
779
780         if (buf) {
781                 if (buf->page)
782                         free_page((unsigned long)buf->page);
783                 kfree(buf);
784         }
785
786         return 0;
787 }
788 static int debug_async_open(struct inode *inode, struct file *file)
789 {
790         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
791
792         return file->private_data ? 0 : -ENOMEM;
793 }
794
795 static int debug_periodic_open(struct inode *inode, struct file *file)
796 {
797         file->private_data = alloc_buffer(inode->i_private,
798                                           fill_periodic_buffer);
799
800         return file->private_data ? 0 : -ENOMEM;
801 }
802
803 static int debug_registers_open(struct inode *inode, struct file *file)
804 {
805         file->private_data = alloc_buffer(inode->i_private,
806                                           fill_registers_buffer);
807
808         return file->private_data ? 0 : -ENOMEM;
809 }
810 static inline void create_debug_files (struct ohci_hcd *ohci)
811 {
812         struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
813         struct device *dev = bus->dev;
814
815         ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
816         if (!ohci->debug_dir)
817                 goto dir_error;
818
819         ohci->debug_async = debugfs_create_file("async", S_IRUGO,
820                                                 ohci->debug_dir, dev,
821                                                 &debug_async_fops);
822         if (!ohci->debug_async)
823                 goto async_error;
824
825         ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
826                                                    ohci->debug_dir, dev,
827                                                    &debug_periodic_fops);
828         if (!ohci->debug_periodic)
829                 goto periodic_error;
830
831         ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
832                                                     ohci->debug_dir, dev,
833                                                     &debug_registers_fops);
834         if (!ohci->debug_registers)
835                 goto registers_error;
836
837         ohci_dbg (ohci, "created debug files\n");
838         return;
839
840 registers_error:
841         debugfs_remove(ohci->debug_periodic);
842 periodic_error:
843         debugfs_remove(ohci->debug_async);
844 async_error:
845         debugfs_remove(ohci->debug_dir);
846 dir_error:
847         ohci->debug_periodic = NULL;
848         ohci->debug_async = NULL;
849         ohci->debug_dir = NULL;
850 }
851
852 static inline void remove_debug_files (struct ohci_hcd *ohci)
853 {
854         debugfs_remove(ohci->debug_registers);
855         debugfs_remove(ohci->debug_periodic);
856         debugfs_remove(ohci->debug_async);
857         debugfs_remove(ohci->debug_dir);
858 }
859
860 #endif
861
862 /*-------------------------------------------------------------------------*/
863