drivers/usb/host/ohci-dbg.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <[email protected]>
   5  * (C) Copyright 2000-2002 David Brownell <[email protected]>
   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                 printk(KERN_DEBUG "%s URB: no dev\n", str);
  33                 return;
  34         }
  35
  36 #ifndef OHCI_VERBOSE_DEBUG
  37         if (status != 0)
  38 #endif
  39         printk(KERN_DEBUG "%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d\n",
  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 "%s: setup(8):", __FILE__);
  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 "%s: data(%d/%d):", __FILE__,
  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 /* Version for use where "next" is the address of a local variable */
  86 #define ohci_dbg_nosw(ohci, next, size, format, arg...) \
  87         do { \
  88                 unsigned s_len; \
  89                 s_len = scnprintf(*next, *size, format, ## arg); \
  90                 *size -= s_len; *next += s_len; \
  91         } while (0);
  92
  93
  94 static void ohci_dump_intr_mask (
  95         struct ohci_hcd *ohci,
  96         char *label,
  97         u32 mask,
  98         char **next,
  99         unsigned *size)
 100 {
 101         ohci_dbg_sw (ohci, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s\n",
 102                 label,
 103                 mask,
 104                 (mask & OHCI_INTR_MIE) ? " MIE" : "",
 105                 (mask & OHCI_INTR_OC) ? " OC" : "",
 106                 (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
 107                 (mask & OHCI_INTR_FNO) ? " FNO" : "",
 108                 (mask & OHCI_INTR_UE) ? " UE" : "",
 109                 (mask & OHCI_INTR_RD) ? " RD" : "",
 110                 (mask & OHCI_INTR_SF) ? " SF" : "",
 111                 (mask & OHCI_INTR_WDH) ? " WDH" : "",
 112                 (mask & OHCI_INTR_SO) ? " SO" : ""
 113                 );
 114 }
 115
 116 static void maybe_print_eds (
 117         struct ohci_hcd *ohci,
 118         char *label,
 119         u32 value,
 120         char **next,
 121         unsigned *size)
 122 {
 123         if (value)
 124                 ohci_dbg_sw (ohci, next, size, "%s %08x\n", label, value);
 125 }
 126
 127 static char *hcfs2string (int state)
 128 {
 129         switch (state) {
 130                 case OHCI_USB_RESET:    return "reset";
 131                 case OHCI_USB_RESUME:   return "resume";
 132                 case OHCI_USB_OPER:     return "operational";
 133                 case OHCI_USB_SUSPEND:  return "suspend";
 134         }
 135         return "?";
 136 }
 137
 138 static const char *rh_state_string(struct ohci_hcd *ohci)
 139 {
 140         switch (ohci->rh_state) {
 141         case OHCI_RH_HALTED:
 142                 return "halted";
 143         case OHCI_RH_SUSPENDED:
 144                 return "suspended";
 145         case OHCI_RH_RUNNING:
 146                 return "running";
 147         }
 148         return "?";
 149 }
 150
 151 // dump control and status registers
 152 static void
 153 ohci_dump_status (struct ohci_hcd *controller, char **next, unsigned *size)
 154 {
 155         struct ohci_regs __iomem *regs = controller->regs;
 156         u32                     temp;
 157
 158         temp = ohci_readl (controller, &regs->revision) & 0xff;
 159         ohci_dbg_sw (controller, next, size,
 160                 "OHCI %d.%d, %s legacy support registers, rh state %s\n",
 161                 0x03 & (temp >> 4), (temp & 0x0f),
 162                 (temp & 0x0100) ? "with" : "NO",
 163                 rh_state_string(controller));
 164
 165         temp = ohci_readl (controller, &regs->control);
 166         ohci_dbg_sw (controller, next, size,
 167                 "control 0x%03x%s%s%s HCFS=%s%s%s%s%s CBSR=%d\n",
 168                 temp,
 169                 (temp & OHCI_CTRL_RWE) ? " RWE" : "",
 170                 (temp & OHCI_CTRL_RWC) ? " RWC" : "",
 171                 (temp & OHCI_CTRL_IR) ? " IR" : "",
 172                 hcfs2string (temp & OHCI_CTRL_HCFS),
 173                 (temp & OHCI_CTRL_BLE) ? " BLE" : "",
 174                 (temp & OHCI_CTRL_CLE) ? " CLE" : "",
 175                 (temp & OHCI_CTRL_IE) ? " IE" : "",
 176                 (temp & OHCI_CTRL_PLE) ? " PLE" : "",
 177                 temp & OHCI_CTRL_CBSR
 178                 );
 179
 180         temp = ohci_readl (controller, &regs->cmdstatus);
 181         ohci_dbg_sw (controller, next, size,
 182                 "cmdstatus 0x%05x SOC=%d%s%s%s%s\n", temp,
 183                 (temp & OHCI_SOC) >> 16,
 184                 (temp & OHCI_OCR) ? " OCR" : "",
 185                 (temp & OHCI_BLF) ? " BLF" : "",
 186                 (temp & OHCI_CLF) ? " CLF" : "",
 187                 (temp & OHCI_HCR) ? " HCR" : ""
 188                 );
 189
 190         ohci_dump_intr_mask (controller, "intrstatus",
 191                         ohci_readl (controller, &regs->intrstatus),
 192                         next, size);
 193         ohci_dump_intr_mask (controller, "intrenable",
 194                         ohci_readl (controller, &regs->intrenable),
 195                         next, size);
 196         // intrdisable always same as intrenable
 197
 198         maybe_print_eds (controller, "ed_periodcurrent",
 199                         ohci_readl (controller, &regs->ed_periodcurrent),
 200                         next, size);
 201
 202         maybe_print_eds (controller, "ed_controlhead",
 203                         ohci_readl (controller, &regs->ed_controlhead),
 204                         next, size);
 205         maybe_print_eds (controller, "ed_controlcurrent",
 206                         ohci_readl (controller, &regs->ed_controlcurrent),
 207                         next, size);
 208
 209         maybe_print_eds (controller, "ed_bulkhead",
 210                         ohci_readl (controller, &regs->ed_bulkhead),
 211                         next, size);
 212         maybe_print_eds (controller, "ed_bulkcurrent",
 213                         ohci_readl (controller, &regs->ed_bulkcurrent),
 214                         next, size);
 215
 216         maybe_print_eds (controller, "donehead",
 217                         ohci_readl (controller, &regs->donehead), next, size);
 218 }
 219
 220 #define dbg_port_sw(hc,num,value,next,size) \
 221         ohci_dbg_sw (hc, next, size, \
 222                 "roothub.portstatus [%d] " \
 223                 "0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
 224                 num, temp, \
 225                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
 226                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
 227                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
 228                 (temp & RH_PS_PESC) ? " PESC" : "", \
 229                 (temp & RH_PS_CSC) ? " CSC" : "", \
 230                 \
 231                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
 232                 (temp & RH_PS_PPS) ? " PPS" : "", \
 233                 (temp & RH_PS_PRS) ? " PRS" : "", \
 234                 (temp & RH_PS_POCI) ? " POCI" : "", \
 235                 (temp & RH_PS_PSS) ? " PSS" : "", \
 236                 \
 237                 (temp & RH_PS_PES) ? " PES" : "", \
 238                 (temp & RH_PS_CCS) ? " CCS" : "" \
 239                 );
 240
 241
 242 static void
 243 ohci_dump_roothub (
 244         struct ohci_hcd *controller,
 245         int verbose,
 246         char **next,
 247         unsigned *size)
 248 {
 249         u32                     temp, i;
 250
 251         temp = roothub_a (controller);
 252         if (temp == ~(u32)0)
 253                 return;
 254
 255         if (verbose) {
 256                 ohci_dbg_sw (controller, next, size,
 257                         "roothub.a %08x POTPGT=%d%s%s%s%s%s NDP=%d(%d)\n", temp,
 258                         ((temp & RH_A_POTPGT) >> 24) & 0xff,
 259                         (temp & RH_A_NOCP) ? " NOCP" : "",
 260                         (temp & RH_A_OCPM) ? " OCPM" : "",
 261                         (temp & RH_A_DT) ? " DT" : "",
 262                         (temp & RH_A_NPS) ? " NPS" : "",
 263                         (temp & RH_A_PSM) ? " PSM" : "",
 264                         (temp & RH_A_NDP), controller->num_ports
 265                         );
 266                 temp = roothub_b (controller);
 267                 ohci_dbg_sw (controller, next, size,
 268                         "roothub.b %08x PPCM=%04x DR=%04x\n",
 269                         temp,
 270                         (temp & RH_B_PPCM) >> 16,
 271                         (temp & RH_B_DR)
 272                         );
 273                 temp = roothub_status (controller);
 274                 ohci_dbg_sw (controller, next, size,
 275                         "roothub.status %08x%s%s%s%s%s%s\n",
 276                         temp,
 277                         (temp & RH_HS_CRWE) ? " CRWE" : "",
 278                         (temp & RH_HS_OCIC) ? " OCIC" : "",
 279                         (temp & RH_HS_LPSC) ? " LPSC" : "",
 280                         (temp & RH_HS_DRWE) ? " DRWE" : "",
 281                         (temp & RH_HS_OCI) ? " OCI" : "",
 282                         (temp & RH_HS_LPS) ? " LPS" : ""
 283                         );
 284         }
 285
 286         for (i = 0; i < controller->num_ports; i++) {
 287                 temp = roothub_portstatus (controller, i);
 288                 dbg_port_sw (controller, i, temp, next, size);
 289         }
 290 }
 291
 292 static void ohci_dump (struct ohci_hcd *controller, int verbose)
 293 {
 294         ohci_dbg (controller, "OHCI controller state\n");
 295
 296         // dumps some of the state we know about
 297         ohci_dump_status (controller, NULL, NULL);
 298         if (controller->hcca)
 299                 ohci_dbg (controller,
 300                         "hcca frame #%04x\n", ohci_frame_no(controller));
 301         ohci_dump_roothub (controller, 1, NULL, NULL);
 302 }
 303
 304 static const char data0 [] = "DATA0";
 305 static const char data1 [] = "DATA1";
 306
 307 static void ohci_dump_td (const struct ohci_hcd *ohci, const char *label,
 308                 const struct td *td)
 309 {
 310         u32     tmp = hc32_to_cpup (ohci, &td->hwINFO);
 311
 312         ohci_dbg (ohci, "%s td %p%s; urb %p index %d; hw next td %08x\n",
 313                 label, td,
 314                 (tmp & TD_DONE) ? " (DONE)" : "",
 315                 td->urb, td->index,
 316                 hc32_to_cpup (ohci, &td->hwNextTD));
 317         if ((tmp & TD_ISO) == 0) {
 318                 const char      *toggle, *pid;
 319                 u32     cbp, be;
 320
 321                 switch (tmp & TD_T) {
 322                 case TD_T_DATA0: toggle = data0; break;
 323                 case TD_T_DATA1: toggle = data1; break;
 324                 case TD_T_TOGGLE: toggle = "(CARRY)"; break;
 325                 default: toggle = "(?)"; break;
 326                 }
 327                 switch (tmp & TD_DP) {
 328                 case TD_DP_SETUP: pid = "SETUP"; break;
 329                 case TD_DP_IN: pid = "IN"; break;
 330                 case TD_DP_OUT: pid = "OUT"; break;
 331                 default: pid = "(bad pid)"; break;
 332                 }
 333                 ohci_dbg (ohci, "     info %08x CC=%x %s DI=%d %s %s\n", tmp,
 334                         TD_CC_GET(tmp), /* EC, */ toggle,
 335                         (tmp & TD_DI) >> 21, pid,
 336                         (tmp & TD_R) ? "R" : "");
 337                 cbp = hc32_to_cpup (ohci, &td->hwCBP);
 338                 be = hc32_to_cpup (ohci, &td->hwBE);
 339                 ohci_dbg (ohci, "     cbp %08x be %08x (len %d)\n", cbp, be,
 340                         cbp ? (be + 1 - cbp) : 0);
 341         } else {
 342                 unsigned        i;
 343                 ohci_dbg (ohci, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
 344                         TD_CC_GET(tmp),
 345                         (tmp >> 24) & 0x07,
 346                         (tmp & TD_DI) >> 21,
 347                         tmp & 0x0000ffff);
 348                 ohci_dbg (ohci, "  bp0 %08x be %08x\n",
 349                         hc32_to_cpup (ohci, &td->hwCBP) & ~0x0fff,
 350                         hc32_to_cpup (ohci, &td->hwBE));
 351                 for (i = 0; i < MAXPSW; i++) {
 352                         u16     psw = ohci_hwPSW (ohci, td, i);
 353                         int     cc = (psw >> 12) & 0x0f;
 354                         ohci_dbg (ohci, "    psw [%d] = %2x, CC=%x %s=%d\n", i,
 355                                 psw, cc,
 356                                 (cc >= 0x0e) ? "OFFSET" : "SIZE",
 357                                 psw & 0x0fff);
 358                 }
 359         }
 360 }
 361
 362 /* caller MUST own hcd spinlock if verbose is set! */
 363 static void __maybe_unused
 364 ohci_dump_ed (const struct ohci_hcd *ohci, const char *label,
 365                 const struct ed *ed, int verbose)
 366 {
 367         u32     tmp = hc32_to_cpu (ohci, ed->hwINFO);
 368         char    *type = "";
 369
 370         ohci_dbg (ohci, "%s, ed %p state 0x%x type %s; next ed %08x\n",
 371                 label,
 372                 ed, ed->state, edstring (ed->type),
 373                 hc32_to_cpup (ohci, &ed->hwNextED));
 374         switch (tmp & (ED_IN|ED_OUT)) {
 375         case ED_OUT: type = "-OUT"; break;
 376         case ED_IN: type = "-IN"; break;
 377         /* else from TDs ... control */
 378         }
 379         ohci_dbg (ohci,
 380                 "  info %08x MAX=%d%s%s%s%s EP=%d%s DEV=%d\n", tmp,
 381                 0x03ff & (tmp >> 16),
 382                 (tmp & ED_DEQUEUE) ? " DQ" : "",
 383                 (tmp & ED_ISO) ? " ISO" : "",
 384                 (tmp & ED_SKIP) ? " SKIP" : "",
 385                 (tmp & ED_LOWSPEED) ? " LOW" : "",
 386                 0x000f & (tmp >> 7),
 387                 type,
 388                 0x007f & tmp);
 389         tmp = hc32_to_cpup (ohci, &ed->hwHeadP);
 390         ohci_dbg (ohci, "  tds: head %08x %s%s tail %08x%s\n",
 391                 tmp,
 392                 (tmp & ED_C) ? data1 : data0,
 393                 (tmp & ED_H) ? " HALT" : "",
 394                 hc32_to_cpup (ohci, &ed->hwTailP),
 395                 verbose ? "" : " (not listing)");
 396         if (verbose) {
 397                 struct list_head        *tmp;
 398
 399                 /* use ed->td_list because HC concurrently modifies
 400                  * hwNextTD as it accumulates ed_donelist.
 401                  */
 402                 list_for_each (tmp, &ed->td_list) {
 403                         struct td               *td;
 404                         td = list_entry (tmp, struct td, td_list);
 405                         ohci_dump_td (ohci, "  ->", td);
 406                 }
 407         }
 408 }
 409
 410 #else
 411 static inline void ohci_dump (struct ohci_hcd *controller, int verbose) {}
 412
 413 #undef OHCI_VERBOSE_DEBUG
 414
 415 #endif /* DEBUG */
 416
 417 /*-------------------------------------------------------------------------*/
 418
 419 #ifdef STUB_DEBUG_FILES
 420
 421 static inline void create_debug_files (struct ohci_hcd *bus) { }
 422 static inline void remove_debug_files (struct ohci_hcd *bus) { }
 423
 424 #else
 425
 426 static int debug_async_open(struct inode *, struct file *);
 427 static int debug_periodic_open(struct inode *, struct file *);
 428 static int debug_registers_open(struct inode *, struct file *);
 429 static int debug_async_open(struct inode *, struct file *);
 430 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
 431 static int debug_close(struct inode *, struct file *);
 432
 433 static const struct file_operations debug_async_fops = {
 434         .owner          = THIS_MODULE,
 435         .open           = debug_async_open,
 436         .read           = debug_output,
 437         .release        = debug_close,
 438         .llseek         = default_llseek,
 439 };
 440 static const struct file_operations debug_periodic_fops = {
 441         .owner          = THIS_MODULE,
 442         .open           = debug_periodic_open,
 443         .read           = debug_output,
 444         .release        = debug_close,
 445         .llseek         = default_llseek,
 446 };
 447 static const struct file_operations debug_registers_fops = {
 448         .owner          = THIS_MODULE,
 449         .open           = debug_registers_open,
 450         .read           = debug_output,
 451         .release        = debug_close,
 452         .llseek         = default_llseek,
 453 };
 454
 455 static struct dentry *ohci_debug_root;
 456
 457 struct debug_buffer {
 458         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
 459         struct ohci_hcd *ohci;
 460         struct mutex mutex;     /* protect filling of buffer */
 461         size_t count;           /* number of characters filled into buffer */
 462         char *page;
 463 };
 464
 465 static ssize_t
 466 show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
 467 {
 468         unsigned                temp, size = count;
 469
 470         if (!ed)
 471                 return 0;
 472
 473         /* print first --> last */
 474         while (ed->ed_prev)
 475                 ed = ed->ed_prev;
 476
 477         /* dump a snapshot of the bulk or control schedule */
 478         while (ed) {
 479                 u32             info = hc32_to_cpu (ohci, ed->hwINFO);
 480                 u32             headp = hc32_to_cpu (ohci, ed->hwHeadP);
 481                 struct list_head *entry;
 482                 struct td       *td;
 483
 484                 temp = scnprintf (buf, size,
 485                         "ed/%p %cs dev%d ep%d%s max %d %08x%s%s %s",
 486                         ed,
 487                         (info & ED_LOWSPEED) ? 'l' : 'f',
 488                         info & 0x7f,
 489                         (info >> 7) & 0xf,
 490                         (info & ED_IN) ? "in" : "out",
 491                         0x03ff & (info >> 16),
 492                         info,
 493                         (info & ED_SKIP) ? " s" : "",
 494                         (headp & ED_H) ? " H" : "",
 495                         (headp & ED_C) ? data1 : data0);
 496                 size -= temp;
 497                 buf += temp;
 498
 499                 list_for_each (entry, &ed->td_list) {
 500                         u32             cbp, be;
 501
 502                         td = list_entry (entry, struct td, td_list);
 503                         info = hc32_to_cpup (ohci, &td->hwINFO);
 504                         cbp = hc32_to_cpup (ohci, &td->hwCBP);
 505                         be = hc32_to_cpup (ohci, &td->hwBE);
 506                         temp = scnprintf (buf, size,
 507                                         "\n\ttd %p %s %d cc=%x urb %p (%08x)",
 508                                         td,
 509                                         ({ char *pid;
 510                                         switch (info & TD_DP) {
 511                                         case TD_DP_SETUP: pid = "setup"; break;
 512                                         case TD_DP_IN: pid = "in"; break;
 513                                         case TD_DP_OUT: pid = "out"; break;
 514                                         default: pid = "(?)"; break;
 515                                          } pid;}),
 516                                         cbp ? (be + 1 - cbp) : 0,
 517                                         TD_CC_GET (info), td->urb, info);
 518                         size -= temp;
 519                         buf += temp;
 520                 }
 521
 522                 temp = scnprintf (buf, size, "\n");
 523                 size -= temp;
 524                 buf += temp;
 525
 526                 ed = ed->ed_next;
 527         }
 528         return count - size;
 529 }
 530
 531 static ssize_t fill_async_buffer(struct debug_buffer *buf)
 532 {
 533         struct ohci_hcd         *ohci;
 534         size_t                  temp;
 535         unsigned long           flags;
 536
 537         ohci = buf->ohci;
 538
 539         /* display control and bulk lists together, for simplicity */
 540         spin_lock_irqsave (&ohci->lock, flags);
 541         temp = show_list(ohci, buf->page, buf->count, ohci->ed_controltail);
 542         temp += show_list(ohci, buf->page + temp, buf->count - temp,
 543                           ohci->ed_bulktail);
 544         spin_unlock_irqrestore (&ohci->lock, flags);
 545
 546         return temp;
 547 }
 548
 549 #define DBG_SCHED_LIMIT 64
 550
 551 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 552 {
 553         struct ohci_hcd         *ohci;
 554         struct ed               **seen, *ed;
 555         unsigned long           flags;
 556         unsigned                temp, size, seen_count;
 557         char                    *next;
 558         unsigned                i;
 559
 560         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
 561                 return 0;
 562         seen_count = 0;
 563
 564         ohci = buf->ohci;
 565         next = buf->page;
 566         size = PAGE_SIZE;
 567
 568         temp = scnprintf (next, size, "size = %d\n", NUM_INTS);
 569         size -= temp;
 570         next += temp;
 571
 572         /* dump a snapshot of the periodic schedule (and load) */
 573         spin_lock_irqsave (&ohci->lock, flags);
 574         for (i = 0; i < NUM_INTS; i++) {
 575                 if (!(ed = ohci->periodic [i]))
 576                         continue;
 577
 578                 temp = scnprintf (next, size, "%2d [%3d]:", i, ohci->load [i]);
 579                 size -= temp;
 580                 next += temp;
 581
 582                 do {
 583                         temp = scnprintf (next, size, " ed%d/%p",
 584                                 ed->interval, ed);
 585                         size -= temp;
 586                         next += temp;
 587                         for (temp = 0; temp < seen_count; temp++) {
 588                                 if (seen [temp] == ed)
 589                                         break;
 590                         }
 591
 592                         /* show more info the first time around */
 593                         if (temp == seen_count) {
 594                                 u32     info = hc32_to_cpu (ohci, ed->hwINFO);
 595                                 struct list_head        *entry;
 596                                 unsigned                qlen = 0;
 597
 598                                 /* qlen measured here in TDs, not urbs */
 599                                 list_for_each (entry, &ed->td_list)
 600                                         qlen++;
 601
 602                                 temp = scnprintf (next, size,
 603                                         " (%cs dev%d ep%d%s-%s qlen %u"
 604                                         " max %d %08x%s%s)",
 605                                         (info & ED_LOWSPEED) ? 'l' : 'f',
 606                                         info & 0x7f,
 607                                         (info >> 7) & 0xf,
 608                                         (info & ED_IN) ? "in" : "out",
 609                                         (info & ED_ISO) ? "iso" : "int",
 610                                         qlen,
 611                                         0x03ff & (info >> 16),
 612                                         info,
 613                                         (info & ED_SKIP) ? " K" : "",
 614                                         (ed->hwHeadP &
 615                                                 cpu_to_hc32(ohci, ED_H)) ?
 616                                                         " H" : "");
 617                                 size -= temp;
 618                                 next += temp;
 619
 620                                 if (seen_count < DBG_SCHED_LIMIT)
 621                                         seen [seen_count++] = ed;
 622
 623                                 ed = ed->ed_next;
 624
 625                         } else {
 626                                 /* we've seen it and what's after */
 627                                 temp = 0;
 628                                 ed = NULL;
 629                         }
 630
 631                 } while (ed);
 632
 633                 temp = scnprintf (next, size, "\n");
 634                 size -= temp;
 635                 next += temp;
 636         }
 637         spin_unlock_irqrestore (&ohci->lock, flags);
 638         kfree (seen);
 639
 640         return PAGE_SIZE - size;
 641 }
 642 #undef DBG_SCHED_LIMIT
 643
 644 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 645 {
 646         struct usb_hcd          *hcd;
 647         struct ohci_hcd         *ohci;
 648         struct ohci_regs __iomem *regs;
 649         unsigned long           flags;
 650         unsigned                temp, size;
 651         char                    *next;
 652         u32                     rdata;
 653
 654         ohci = buf->ohci;
 655         hcd = ohci_to_hcd(ohci);
 656         regs = ohci->regs;
 657         next = buf->page;
 658         size = PAGE_SIZE;
 659
 660         spin_lock_irqsave (&ohci->lock, flags);
 661
 662         /* dump driver info, then registers in spec order */
 663
 664         ohci_dbg_nosw(ohci, &next, &size,
 665                 "bus %s, device %s\n"
 666                 "%s\n"
 667                 "%s\n",
 668                 hcd->self.controller->bus->name,
 669                 dev_name(hcd->self.controller),
 670                 hcd->product_desc,
 671                 hcd_name);
 672
 673         if (!HCD_HW_ACCESSIBLE(hcd)) {
 674                 size -= scnprintf (next, size,
 675                         "SUSPENDED (no register access)\n");
 676                 goto done;
 677         }
 678
 679         ohci_dump_status(ohci, &next, &size);
 680
 681         /* hcca */
 682         if (ohci->hcca)
 683                 ohci_dbg_nosw(ohci, &next, &size,
 684                         "hcca frame 0x%04x\n", ohci_frame_no(ohci));
 685
 686         /* other registers mostly affect frame timings */
 687         rdata = ohci_readl (ohci, &regs->fminterval);
 688         temp = scnprintf (next, size,
 689                         "fmintvl 0x%08x %sFSMPS=0x%04x FI=0x%04x\n",
 690                         rdata, (rdata >> 31) ? "FIT " : "",
 691                         (rdata >> 16) & 0xefff, rdata & 0xffff);
 692         size -= temp;
 693         next += temp;
 694
 695         rdata = ohci_readl (ohci, &regs->fmremaining);
 696         temp = scnprintf (next, size, "fmremaining 0x%08x %sFR=0x%04x\n",
 697                         rdata, (rdata >> 31) ? "FRT " : "",
 698                         rdata & 0x3fff);
 699         size -= temp;
 700         next += temp;
 701
 702         rdata = ohci_readl (ohci, &regs->periodicstart);
 703         temp = scnprintf (next, size, "periodicstart 0x%04x\n",
 704                         rdata & 0x3fff);
 705         size -= temp;
 706         next += temp;
 707
 708         rdata = ohci_readl (ohci, &regs->lsthresh);
 709         temp = scnprintf (next, size, "lsthresh 0x%04x\n",
 710                         rdata & 0x3fff);
 711         size -= temp;
 712         next += temp;
 713
 714         temp = scnprintf (next, size, "hub poll timer %s\n",
 715                         HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off");
 716         size -= temp;
 717         next += temp;
 718
 719         /* roothub */
 720         ohci_dump_roothub (ohci, 1, &next, &size);
 721
 722 done:
 723         spin_unlock_irqrestore (&ohci->lock, flags);
 724
 725         return PAGE_SIZE - size;
 726 }
 727
 728 static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
 729                                 ssize_t (*fill_func)(struct debug_buffer *))
 730 {
 731         struct debug_buffer *buf;
 732
 733         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 734
 735         if (buf) {
 736                 buf->ohci = ohci;
 737                 buf->fill_func = fill_func;
 738                 mutex_init(&buf->mutex);
 739         }
 740
 741         return buf;
 742 }
 743
 744 static int fill_buffer(struct debug_buffer *buf)
 745 {
 746         int ret = 0;
 747
 748         if (!buf->page)
 749                 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
 750
 751         if (!buf->page) {
 752                 ret = -ENOMEM;
 753                 goto out;
 754         }
 755
 756         ret = buf->fill_func(buf);
 757
 758         if (ret >= 0) {
 759                 buf->count = ret;
 760                 ret = 0;
 761         }
 762
 763 out:
 764         return ret;
 765 }
 766
 767 static ssize_t debug_output(struct file *file, char __user *user_buf,
 768                         size_t len, loff_t *offset)
 769 {
 770         struct debug_buffer *buf = file->private_data;
 771         int ret = 0;
 772
 773         mutex_lock(&buf->mutex);
 774         if (buf->count == 0) {
 775                 ret = fill_buffer(buf);
 776                 if (ret != 0) {
 777                         mutex_unlock(&buf->mutex);
 778                         goto out;
 779                 }
 780         }
 781         mutex_unlock(&buf->mutex);
 782
 783         ret = simple_read_from_buffer(user_buf, len, offset,
 784                                       buf->page, buf->count);
 785
 786 out:
 787         return ret;
 788
 789 }
 790
 791 static int debug_close(struct inode *inode, struct file *file)
 792 {
 793         struct debug_buffer *buf = file->private_data;
 794
 795         if (buf) {
 796                 if (buf->page)
 797                         free_page((unsigned long)buf->page);
 798                 kfree(buf);
 799         }
 800
 801         return 0;
 802 }
 803 static int debug_async_open(struct inode *inode, struct file *file)
 804 {
 805         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
 806
 807         return file->private_data ? 0 : -ENOMEM;
 808 }
 809
 810 static int debug_periodic_open(struct inode *inode, struct file *file)
 811 {
 812         file->private_data = alloc_buffer(inode->i_private,
 813                                           fill_periodic_buffer);
 814
 815         return file->private_data ? 0 : -ENOMEM;
 816 }
 817
 818 static int debug_registers_open(struct inode *inode, struct file *file)
 819 {
 820         file->private_data = alloc_buffer(inode->i_private,
 821                                           fill_registers_buffer);
 822
 823         return file->private_data ? 0 : -ENOMEM;
 824 }
 825 static inline void create_debug_files (struct ohci_hcd *ohci)
 826 {
 827         struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
 828
 829         ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
 830         if (!ohci->debug_dir)
 831                 goto dir_error;
 832
 833         ohci->debug_async = debugfs_create_file("async", S_IRUGO,
 834                                                 ohci->debug_dir, ohci,
 835                                                 &debug_async_fops);
 836         if (!ohci->debug_async)
 837                 goto async_error;
 838
 839         ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
 840                                                    ohci->debug_dir, ohci,
 841                                                    &debug_periodic_fops);
 842         if (!ohci->debug_periodic)
 843                 goto periodic_error;
 844
 845         ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
 846                                                     ohci->debug_dir, ohci,
 847                                                     &debug_registers_fops);
 848         if (!ohci->debug_registers)
 849                 goto registers_error;
 850
 851         ohci_dbg (ohci, "created debug files\n");
 852         return;
 853
 854 registers_error:
 855         debugfs_remove(ohci->debug_periodic);
 856 periodic_error:
 857         debugfs_remove(ohci->debug_async);
 858 async_error:
 859         debugfs_remove(ohci->debug_dir);
 860 dir_error:
 861         ohci->debug_periodic = NULL;
 862         ohci->debug_async = NULL;
 863         ohci->debug_dir = NULL;
 864 }
 865
 866 static inline void remove_debug_files (struct ohci_hcd *ohci)
 867 {
 868         debugfs_remove(ohci->debug_registers);
 869         debugfs_remove(ohci->debug_periodic);
 870         debugfs_remove(ohci->debug_async);
 871         debugfs_remove(ohci->debug_dir);
 872 }
 873
 874 #endif
 875
 876 /*-------------------------------------------------------------------------*/
 877