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