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