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