git.oblomov.eu Git - linux-2.6/blob - drivers/usb/host/ehci-dbg.c

   1 /*
   2  * Copyright (c) 2001-2002 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 #define ehci_dbg(ehci, fmt, args...) \
  22         dev_dbg (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
  23 #define ehci_err(ehci, fmt, args...) \
  24         dev_err (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
  25 #define ehci_info(ehci, fmt, args...) \
  26         dev_info (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
  27 #define ehci_warn(ehci, fmt, args...) \
  28         dev_warn (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
  29
  30 #ifdef VERBOSE_DEBUG
  31 #       define vdbg dbg
  32 #       define ehci_vdbg ehci_dbg
  33 #else
  34 #       define vdbg(fmt,args...) do { } while (0)
  35 #       define ehci_vdbg(ehci, fmt, args...) do { } while (0)
  36 #endif
  37
  38 #ifdef  DEBUG
  39
  40 /* check the values in the HCSPARAMS register
  41  * (host controller _Structural_ parameters)
  42  * see EHCI spec, Table 2-4 for each value
  43  */
  44 static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
  45 {
  46         u32     params = ehci_readl(ehci, &ehci->caps->hcs_params);
  47
  48         ehci_dbg (ehci,
  49                 "%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
  50                 label, params,
  51                 HCS_DEBUG_PORT (params),
  52                 HCS_INDICATOR (params) ? " ind" : "",
  53                 HCS_N_CC (params),
  54                 HCS_N_PCC (params),
  55                 HCS_PORTROUTED (params) ? "" : " ordered",
  56                 HCS_PPC (params) ? "" : " !ppc",
  57                 HCS_N_PORTS (params)
  58                 );
  59         /* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
  60         if (HCS_PORTROUTED (params)) {
  61                 int i;
  62                 char buf [46], tmp [7], byte;
  63
  64                 buf[0] = 0;
  65                 for (i = 0; i < HCS_N_PORTS (params); i++) {
  66                         // FIXME MIPS won't readb() ...
  67                         byte = readb (&ehci->caps->portroute[(i>>1)]);
  68                         sprintf(tmp, "%d ",
  69                                 ((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
  70                         strcat(buf, tmp);
  71                 }
  72                 ehci_dbg (ehci, "%s portroute %s\n",
  73                                 label, buf);
  74         }
  75 }
  76 #else
  77
  78 static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}
  79
  80 #endif
  81
  82 #ifdef  DEBUG
  83
  84 /* check the values in the HCCPARAMS register
  85  * (host controller _Capability_ parameters)
  86  * see EHCI Spec, Table 2-5 for each value
  87  * */
  88 static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
  89 {
  90         u32     params = ehci_readl(ehci, &ehci->caps->hcc_params);
  91
  92         if (HCC_ISOC_CACHE (params)) {
  93                 ehci_dbg (ehci,
  94                         "%s hcc_params %04x caching frame %s%s%s\n",
  95                         label, params,
  96                         HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
  97                         HCC_CANPARK(params) ? " park" : "",
  98                         HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
  99         } else {
 100                 ehci_dbg (ehci,
 101                         "%s hcc_params %04x thresh %d uframes %s%s%s\n",
 102                         label,
 103                         params,
 104                         HCC_ISOC_THRES(params),
 105                         HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
 106                         HCC_CANPARK(params) ? " park" : "",
 107                         HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
 108         }
 109 }
 110 #else
 111
 112 static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}
 113
 114 #endif
 115
 116 #ifdef  DEBUG
 117
 118 static void __maybe_unused
 119 dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
 120 {
 121         ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
 122                 hc32_to_cpup(ehci, &qtd->hw_next),
 123                 hc32_to_cpup(ehci, &qtd->hw_alt_next),
 124                 hc32_to_cpup(ehci, &qtd->hw_token),
 125                 hc32_to_cpup(ehci, &qtd->hw_buf [0]));
 126         if (qtd->hw_buf [1])
 127                 ehci_dbg(ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
 128                         hc32_to_cpup(ehci, &qtd->hw_buf[1]),
 129                         hc32_to_cpup(ehci, &qtd->hw_buf[2]),
 130                         hc32_to_cpup(ehci, &qtd->hw_buf[3]),
 131                         hc32_to_cpup(ehci, &qtd->hw_buf[4]));
 132 }
 133
 134 static void __maybe_unused
 135 dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
 136 {
 137         ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
 138                 qh, qh->hw_next, qh->hw_info1, qh->hw_info2,
 139                 qh->hw_current);
 140         dbg_qtd ("overlay", ehci, (struct ehci_qtd *) &qh->hw_qtd_next);
 141 }
 142
 143 static void __maybe_unused
 144 dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
 145 {
 146         ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
 147                 label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
 148                 itd->urb);
 149         ehci_dbg (ehci,
 150                 "  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
 151                 hc32_to_cpu(ehci, itd->hw_transaction[0]),
 152                 hc32_to_cpu(ehci, itd->hw_transaction[1]),
 153                 hc32_to_cpu(ehci, itd->hw_transaction[2]),
 154                 hc32_to_cpu(ehci, itd->hw_transaction[3]),
 155                 hc32_to_cpu(ehci, itd->hw_transaction[4]),
 156                 hc32_to_cpu(ehci, itd->hw_transaction[5]),
 157                 hc32_to_cpu(ehci, itd->hw_transaction[6]),
 158                 hc32_to_cpu(ehci, itd->hw_transaction[7]));
 159         ehci_dbg (ehci,
 160                 "  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
 161                 hc32_to_cpu(ehci, itd->hw_bufp[0]),
 162                 hc32_to_cpu(ehci, itd->hw_bufp[1]),
 163                 hc32_to_cpu(ehci, itd->hw_bufp[2]),
 164                 hc32_to_cpu(ehci, itd->hw_bufp[3]),
 165                 hc32_to_cpu(ehci, itd->hw_bufp[4]),
 166                 hc32_to_cpu(ehci, itd->hw_bufp[5]),
 167                 hc32_to_cpu(ehci, itd->hw_bufp[6]));
 168         ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
 169                 itd->index[0], itd->index[1], itd->index[2],
 170                 itd->index[3], itd->index[4], itd->index[5],
 171                 itd->index[6], itd->index[7]);
 172 }
 173
 174 static void __maybe_unused
 175 dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd)
 176 {
 177         ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
 178                 label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next),
 179                 sitd->urb);
 180         ehci_dbg (ehci,
 181                 "  addr %08x sched %04x result %08x buf %08x %08x\n",
 182                 hc32_to_cpu(ehci, sitd->hw_fullspeed_ep),
 183                 hc32_to_cpu(ehci, sitd->hw_uframe),
 184                 hc32_to_cpu(ehci, sitd->hw_results),
 185                 hc32_to_cpu(ehci, sitd->hw_buf[0]),
 186                 hc32_to_cpu(ehci, sitd->hw_buf[1]));
 187 }
 188
 189 static int __maybe_unused
 190 dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
 191 {
 192         return scnprintf (buf, len,
 193                 "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
 194                 label, label [0] ? " " : "", status,
 195                 (status & STS_ASS) ? " Async" : "",
 196                 (status & STS_PSS) ? " Periodic" : "",
 197                 (status & STS_RECL) ? " Recl" : "",
 198                 (status & STS_HALT) ? " Halt" : "",
 199                 (status & STS_IAA) ? " IAA" : "",
 200                 (status & STS_FATAL) ? " FATAL" : "",
 201                 (status & STS_FLR) ? " FLR" : "",
 202                 (status & STS_PCD) ? " PCD" : "",
 203                 (status & STS_ERR) ? " ERR" : "",
 204                 (status & STS_INT) ? " INT" : ""
 205                 );
 206 }
 207
 208 static int __maybe_unused
 209 dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
 210 {
 211         return scnprintf (buf, len,
 212                 "%s%sintrenable %02x%s%s%s%s%s%s",
 213                 label, label [0] ? " " : "", enable,
 214                 (enable & STS_IAA) ? " IAA" : "",
 215                 (enable & STS_FATAL) ? " FATAL" : "",
 216                 (enable & STS_FLR) ? " FLR" : "",
 217                 (enable & STS_PCD) ? " PCD" : "",
 218                 (enable & STS_ERR) ? " ERR" : "",
 219                 (enable & STS_INT) ? " INT" : ""
 220                 );
 221 }
 222
 223 static const char *const fls_strings [] =
 224     { "1024", "512", "256", "??" };
 225
 226 static int
 227 dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
 228 {
 229         return scnprintf (buf, len,
 230                 "%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
 231                 label, label [0] ? " " : "", command,
 232                 (command & CMD_PARK) ? "park" : "(park)",
 233                 CMD_PARK_CNT (command),
 234                 (command >> 16) & 0x3f,
 235                 (command & CMD_LRESET) ? " LReset" : "",
 236                 (command & CMD_IAAD) ? " IAAD" : "",
 237                 (command & CMD_ASE) ? " Async" : "",
 238                 (command & CMD_PSE) ? " Periodic" : "",
 239                 fls_strings [(command >> 2) & 0x3],
 240                 (command & CMD_RESET) ? " Reset" : "",
 241                 (command & CMD_RUN) ? "RUN" : "HALT"
 242                 );
 243 }
 244
 245 static int
 246 dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
 247 {
 248         char    *sig;
 249
 250         /* signaling state */
 251         switch (status & (3 << 10)) {
 252         case 0 << 10: sig = "se0"; break;
 253         case 1 << 10: sig = "k"; break;         /* low speed */
 254         case 2 << 10: sig = "j"; break;
 255         default: sig = "?"; break;
 256         }
 257
 258         return scnprintf (buf, len,
 259                 "%s%sport %d status %06x%s%s sig=%s%s%s%s%s%s%s%s%s%s",
 260                 label, label [0] ? " " : "", port, status,
 261                 (status & PORT_POWER) ? " POWER" : "",
 262                 (status & PORT_OWNER) ? " OWNER" : "",
 263                 sig,
 264                 (status & PORT_RESET) ? " RESET" : "",
 265                 (status & PORT_SUSPEND) ? " SUSPEND" : "",
 266                 (status & PORT_RESUME) ? " RESUME" : "",
 267                 (status & PORT_OCC) ? " OCC" : "",
 268                 (status & PORT_OC) ? " OC" : "",
 269                 (status & PORT_PEC) ? " PEC" : "",
 270                 (status & PORT_PE) ? " PE" : "",
 271                 (status & PORT_CSC) ? " CSC" : "",
 272                 (status & PORT_CONNECT) ? " CONNECT" : "");
 273 }
 274
 275 #else
 276 static inline void __maybe_unused
 277 dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
 278 {}
 279
 280 static inline int __maybe_unused
 281 dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
 282 { return 0; }
 283
 284 static inline int __maybe_unused
 285 dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
 286 { return 0; }
 287
 288 static inline int __maybe_unused
 289 dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
 290 { return 0; }
 291
 292 static inline int __maybe_unused
 293 dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
 294 { return 0; }
 295
 296 #endif  /* DEBUG */
 297
 298 /* functions have the "wrong" filename when they're output... */
 299 #define dbg_status(ehci, label, status) { \
 300         char _buf [80]; \
 301         dbg_status_buf (_buf, sizeof _buf, label, status); \
 302         ehci_dbg (ehci, "%s\n", _buf); \
 303 }
 304
 305 #define dbg_cmd(ehci, label, command) { \
 306         char _buf [80]; \
 307         dbg_command_buf (_buf, sizeof _buf, label, command); \
 308         ehci_dbg (ehci, "%s\n", _buf); \
 309 }
 310
 311 #define dbg_port(ehci, label, port, status) { \
 312         char _buf [80]; \
 313         dbg_port_buf (_buf, sizeof _buf, label, port, status); \
 314         ehci_dbg (ehci, "%s\n", _buf); \
 315 }
 316
 317 /*-------------------------------------------------------------------------*/
 318
 319 #ifdef STUB_DEBUG_FILES
 320
 321 static inline void create_debug_files (struct ehci_hcd *bus) { }
 322 static inline void remove_debug_files (struct ehci_hcd *bus) { }
 323
 324 #else
 325
 326 /* troubleshooting help: expose state in debugfs */
 327
 328 static int debug_async_open(struct inode *, struct file *);
 329 static int debug_periodic_open(struct inode *, struct file *);
 330 static int debug_registers_open(struct inode *, struct file *);
 331 static int debug_async_open(struct inode *, struct file *);
 332 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
 333 static int debug_close(struct inode *, struct file *);
 334
 335 static const struct file_operations debug_async_fops = {
 336         .owner          = THIS_MODULE,
 337         .open           = debug_async_open,
 338         .read           = debug_output,
 339         .release        = debug_close,
 340 };
 341 static const struct file_operations debug_periodic_fops = {
 342         .owner          = THIS_MODULE,
 343         .open           = debug_periodic_open,
 344         .read           = debug_output,
 345         .release        = debug_close,
 346 };
 347 static const struct file_operations debug_registers_fops = {
 348         .owner          = THIS_MODULE,
 349         .open           = debug_registers_open,
 350         .read           = debug_output,
 351         .release        = debug_close,
 352 };
 353
 354 static struct dentry *ehci_debug_root;
 355
 356 struct debug_buffer {
 357         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
 358         struct usb_bus *bus;
 359         struct mutex mutex;     /* protect filling of buffer */
 360         size_t count;           /* number of characters filled into buffer */
 361         char *page;
 362 };
 363
 364 #define speed_char(info1) ({ char tmp; \
 365                 switch (info1 & (3 << 12)) { \
 366                 case 0 << 12: tmp = 'f'; break; \
 367                 case 1 << 12: tmp = 'l'; break; \
 368                 case 2 << 12: tmp = 'h'; break; \
 369                 default: tmp = '?'; break; \
 370                 }; tmp; })
 371
 372 static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
 373 {
 374         __u32 v = hc32_to_cpu(ehci, token);
 375
 376         if (v & QTD_STS_ACTIVE)
 377                 return '*';
 378         if (v & QTD_STS_HALT)
 379                 return '-';
 380         if (!IS_SHORT_READ (v))
 381                 return ' ';
 382         /* tries to advance through hw_alt_next */
 383         return '/';
 384 }
 385
 386 static void qh_lines (
 387         struct ehci_hcd *ehci,
 388         struct ehci_qh *qh,
 389         char **nextp,
 390         unsigned *sizep
 391 )
 392 {
 393         u32                     scratch;
 394         u32                     hw_curr;
 395         struct list_head        *entry;
 396         struct ehci_qtd         *td;
 397         unsigned                temp;
 398         unsigned                size = *sizep;
 399         char                    *next = *nextp;
 400         char                    mark;
 401         __le32                  list_end = EHCI_LIST_END(ehci);
 402
 403         if (qh->hw_qtd_next == list_end)        /* NEC does this */
 404                 mark = '@';
 405         else
 406                 mark = token_mark(ehci, qh->hw_token);
 407         if (mark == '/') {      /* qh_alt_next controls qh advance? */
 408                 if ((qh->hw_alt_next & QTD_MASK(ehci))
 409                                 == ehci->async->hw_alt_next)
 410                         mark = '#';     /* blocked */
 411                 else if (qh->hw_alt_next == list_end)
 412                         mark = '.';     /* use hw_qtd_next */
 413                 /* else alt_next points to some other qtd */
 414         }
 415         scratch = hc32_to_cpup(ehci, &qh->hw_info1);
 416         hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &qh->hw_current) : 0;
 417         temp = scnprintf (next, size,
 418                         "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
 419                         qh, scratch & 0x007f,
 420                         speed_char (scratch),
 421                         (scratch >> 8) & 0x000f,
 422                         scratch, hc32_to_cpup(ehci, &qh->hw_info2),
 423                         hc32_to_cpup(ehci, &qh->hw_token), mark,
 424                         (cpu_to_hc32(ehci, QTD_TOGGLE) & qh->hw_token)
 425                                 ? "data1" : "data0",
 426                         (hc32_to_cpup(ehci, &qh->hw_alt_next) >> 1) & 0x0f);
 427         size -= temp;
 428         next += temp;
 429
 430         /* hc may be modifying the list as we read it ... */
 431         list_for_each (entry, &qh->qtd_list) {
 432                 td = list_entry (entry, struct ehci_qtd, qtd_list);
 433                 scratch = hc32_to_cpup(ehci, &td->hw_token);
 434                 mark = ' ';
 435                 if (hw_curr == td->qtd_dma)
 436                         mark = '*';
 437                 else if (qh->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma))
 438                         mark = '+';
 439                 else if (QTD_LENGTH (scratch)) {
 440                         if (td->hw_alt_next == ehci->async->hw_alt_next)
 441                                 mark = '#';
 442                         else if (td->hw_alt_next != list_end)
 443                                 mark = '/';
 444                 }
 445                 temp = snprintf (next, size,
 446                                 "\n\t%p%c%s len=%d %08x urb %p",
 447                                 td, mark, ({ char *tmp;
 448                                  switch ((scratch>>8)&0x03) {
 449                                  case 0: tmp = "out"; break;
 450                                  case 1: tmp = "in"; break;
 451                                  case 2: tmp = "setup"; break;
 452                                  default: tmp = "?"; break;
 453                                  } tmp;}),
 454                                 (scratch >> 16) & 0x7fff,
 455                                 scratch,
 456                                 td->urb);
 457                 if (temp < 0)
 458                         temp = 0;
 459                 else if (size < temp)
 460                         temp = size;
 461                 size -= temp;
 462                 next += temp;
 463                 if (temp == size)
 464                         goto done;
 465         }
 466
 467         temp = snprintf (next, size, "\n");
 468         if (temp < 0)
 469                 temp = 0;
 470         else if (size < temp)
 471                 temp = size;
 472         size -= temp;
 473         next += temp;
 474
 475 done:
 476         *sizep = size;
 477         *nextp = next;
 478 }
 479
 480 static ssize_t fill_async_buffer(struct debug_buffer *buf)
 481 {
 482         struct usb_hcd          *hcd;
 483         struct ehci_hcd         *ehci;
 484         unsigned long           flags;
 485         unsigned                temp, size;
 486         char                    *next;
 487         struct ehci_qh          *qh;
 488
 489         hcd = bus_to_hcd(buf->bus);
 490         ehci = hcd_to_ehci (hcd);
 491         next = buf->page;
 492         size = PAGE_SIZE;
 493
 494         *next = 0;
 495
 496         /* dumps a snapshot of the async schedule.
 497          * usually empty except for long-term bulk reads, or head.
 498          * one QH per line, and TDs we know about
 499          */
 500         spin_lock_irqsave (&ehci->lock, flags);
 501         for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
 502                 qh_lines (ehci, qh, &next, &size);
 503         if (ehci->reclaim && size > 0) {
 504                 temp = scnprintf (next, size, "\nreclaim =\n");
 505                 size -= temp;
 506                 next += temp;
 507
 508                 for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
 509                         qh_lines (ehci, qh, &next, &size);
 510         }
 511         spin_unlock_irqrestore (&ehci->lock, flags);
 512
 513         return strlen(buf->page);
 514 }
 515
 516 #define DBG_SCHED_LIMIT 64
 517 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 518 {
 519         struct usb_hcd          *hcd;
 520         struct ehci_hcd         *ehci;
 521         unsigned long           flags;
 522         union ehci_shadow       p, *seen;
 523         unsigned                temp, size, seen_count;
 524         char                    *next;
 525         unsigned                i;
 526         __hc32                  tag;
 527
 528         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
 529                 return 0;
 530         seen_count = 0;
 531
 532         hcd = bus_to_hcd(buf->bus);
 533         ehci = hcd_to_ehci (hcd);
 534         next = buf->page;
 535         size = PAGE_SIZE;
 536
 537         temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
 538         size -= temp;
 539         next += temp;
 540
 541         /* dump a snapshot of the periodic schedule.
 542          * iso changes, interrupt usually doesn't.
 543          */
 544         spin_lock_irqsave (&ehci->lock, flags);
 545         for (i = 0; i < ehci->periodic_size; i++) {
 546                 p = ehci->pshadow [i];
 547                 if (likely (!p.ptr))
 548                         continue;
 549                 tag = Q_NEXT_TYPE(ehci, ehci->periodic [i]);
 550
 551                 temp = scnprintf (next, size, "%4d: ", i);
 552                 size -= temp;
 553                 next += temp;
 554
 555                 do {
 556                         switch (hc32_to_cpu(ehci, tag)) {
 557                         case Q_TYPE_QH:
 558                                 temp = scnprintf (next, size, " qh%d-%04x/%p",
 559                                                 p.qh->period,
 560                                                 hc32_to_cpup(ehci,
 561                                                                 &p.qh->hw_info2)
 562                                                         /* uframe masks */
 563                                                         & (QH_CMASK | QH_SMASK),
 564                                                 p.qh);
 565                                 size -= temp;
 566                                 next += temp;
 567                                 /* don't repeat what follows this qh */
 568                                 for (temp = 0; temp < seen_count; temp++) {
 569                                         if (seen [temp].ptr != p.ptr)
 570                                                 continue;
 571                                         if (p.qh->qh_next.ptr)
 572                                                 temp = scnprintf (next, size,
 573                                                         " ...");
 574                                         p.ptr = NULL;
 575                                         break;
 576                                 }
 577                                 /* show more info the first time around */
 578                                 if (temp == seen_count && p.ptr) {
 579                                         u32     scratch = hc32_to_cpup(ehci,
 580                                                         &p.qh->hw_info1);
 581                                         struct ehci_qtd *qtd;
 582                                         char            *type = "";
 583
 584                                         /* count tds, get ep direction */
 585                                         temp = 0;
 586                                         list_for_each_entry (qtd,
 587                                                         &p.qh->qtd_list,
 588                                                         qtd_list) {
 589                                                 temp++;
 590                                                 switch (0x03 & (hc32_to_cpu(
 591                                                         ehci,
 592                                                         qtd->hw_token) >> 8)) {
 593                                                 case 0: type = "out"; continue;
 594                                                 case 1: type = "in"; continue;
 595                                                 }
 596                                         }
 597
 598                                         temp = scnprintf (next, size,
 599                                                 " (%c%d ep%d%s "
 600                                                 "[%d/%d] q%d p%d)",
 601                                                 speed_char (scratch),
 602                                                 scratch & 0x007f,
 603                                                 (scratch >> 8) & 0x000f, type,
 604                                                 p.qh->usecs, p.qh->c_usecs,
 605                                                 temp,
 606                                                 0x7ff & (scratch >> 16));
 607
 608                                         if (seen_count < DBG_SCHED_LIMIT)
 609                                                 seen [seen_count++].qh = p.qh;
 610                                 } else
 611                                         temp = 0;
 612                                 if (p.qh) {
 613                                         tag = Q_NEXT_TYPE(ehci, p.qh->hw_next);
 614                                         p = p.qh->qh_next;
 615                                 }
 616                                 break;
 617                         case Q_TYPE_FSTN:
 618                                 temp = scnprintf (next, size,
 619                                         " fstn-%8x/%p", p.fstn->hw_prev,
 620                                         p.fstn);
 621                                 tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
 622                                 p = p.fstn->fstn_next;
 623                                 break;
 624                         case Q_TYPE_ITD:
 625                                 temp = scnprintf (next, size,
 626                                         " itd/%p", p.itd);
 627                                 tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
 628                                 p = p.itd->itd_next;
 629                                 break;
 630                         case Q_TYPE_SITD:
 631                                 temp = scnprintf (next, size,
 632                                         " sitd%d-%04x/%p",
 633                                         p.sitd->stream->interval,
 634                                         hc32_to_cpup(ehci, &p.sitd->hw_uframe)
 635                                                 & 0x0000ffff,
 636                                         p.sitd);
 637                                 tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
 638                                 p = p.sitd->sitd_next;
 639                                 break;
 640                         }
 641                         size -= temp;
 642                         next += temp;
 643                 } while (p.ptr);
 644
 645                 temp = scnprintf (next, size, "\n");
 646                 size -= temp;
 647                 next += temp;
 648         }
 649         spin_unlock_irqrestore (&ehci->lock, flags);
 650         kfree (seen);
 651
 652         return PAGE_SIZE - size;
 653 }
 654 #undef DBG_SCHED_LIMIT
 655
 656 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 657 {
 658         struct usb_hcd          *hcd;
 659         struct ehci_hcd         *ehci;
 660         unsigned long           flags;
 661         unsigned                temp, size, i;
 662         char                    *next, scratch [80];
 663         static char             fmt [] = "%*s\n";
 664         static char             label [] = "";
 665
 666         hcd = bus_to_hcd(buf->bus);
 667         ehci = hcd_to_ehci (hcd);
 668         next = buf->page;
 669         size = PAGE_SIZE;
 670
 671         spin_lock_irqsave (&ehci->lock, flags);
 672
 673         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 674                 size = scnprintf (next, size,
 675                         "bus %s, device %s (driver " DRIVER_VERSION ")\n"
 676                         "%s\n"
 677                         "SUSPENDED (no register access)\n",
 678                         hcd->self.controller->bus->name,
 679                         hcd->self.controller->bus_id,
 680                         hcd->product_desc);
 681                 goto done;
 682         }
 683
 684         /* Capability Registers */
 685         i = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
 686         temp = scnprintf (next, size,
 687                 "bus %s, device %s (driver " DRIVER_VERSION ")\n"
 688                 "%s\n"
 689                 "EHCI %x.%02x, hcd state %d\n",
 690                 hcd->self.controller->bus->name,
 691                 hcd->self.controller->bus_id,
 692                 hcd->product_desc,
 693                 i >> 8, i & 0x0ff, hcd->state);
 694         size -= temp;
 695         next += temp;
 696
 697 #ifdef  CONFIG_PCI
 698         /* EHCI 0.96 and later may have "extended capabilities" */
 699         if (hcd->self.controller->bus == &pci_bus_type) {
 700                 struct pci_dev  *pdev;
 701                 u32             offset, cap, cap2;
 702                 unsigned        count = 256/4;
 703
 704                 pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
 705                 offset = HCC_EXT_CAPS(ehci_readl(ehci,
 706                                 &ehci->caps->hcc_params));
 707                 while (offset && count--) {
 708                         pci_read_config_dword (pdev, offset, &cap);
 709                         switch (cap & 0xff) {
 710                         case 1:
 711                                 temp = scnprintf (next, size,
 712                                         "ownership %08x%s%s\n", cap,
 713                                         (cap & (1 << 24)) ? " linux" : "",
 714                                         (cap & (1 << 16)) ? " firmware" : "");
 715                                 size -= temp;
 716                                 next += temp;
 717
 718                                 offset += 4;
 719                                 pci_read_config_dword (pdev, offset, &cap2);
 720                                 temp = scnprintf (next, size,
 721                                         "SMI sts/enable 0x%08x\n", cap2);
 722                                 size -= temp;
 723                                 next += temp;
 724                                 break;
 725                         case 0:         /* illegal reserved capability */
 726                                 cap = 0;
 727                                 /* FALLTHROUGH */
 728                         default:                /* unknown */
 729                                 break;
 730                         }
 731                         temp = (cap >> 8) & 0xff;
 732                 }
 733         }
 734 #endif
 735
 736         // FIXME interpret both types of params
 737         i = ehci_readl(ehci, &ehci->caps->hcs_params);
 738         temp = scnprintf (next, size, "structural params 0x%08x\n", i);
 739         size -= temp;
 740         next += temp;
 741
 742         i = ehci_readl(ehci, &ehci->caps->hcc_params);
 743         temp = scnprintf (next, size, "capability params 0x%08x\n", i);
 744         size -= temp;
 745         next += temp;
 746
 747         /* Operational Registers */
 748         temp = dbg_status_buf (scratch, sizeof scratch, label,
 749                         ehci_readl(ehci, &ehci->regs->status));
 750         temp = scnprintf (next, size, fmt, temp, scratch);
 751         size -= temp;
 752         next += temp;
 753
 754         temp = dbg_command_buf (scratch, sizeof scratch, label,
 755                         ehci_readl(ehci, &ehci->regs->command));
 756         temp = scnprintf (next, size, fmt, temp, scratch);
 757         size -= temp;
 758         next += temp;
 759
 760         temp = dbg_intr_buf (scratch, sizeof scratch, label,
 761                         ehci_readl(ehci, &ehci->regs->intr_enable));
 762         temp = scnprintf (next, size, fmt, temp, scratch);
 763         size -= temp;
 764         next += temp;
 765
 766         temp = scnprintf (next, size, "uframe %04x\n",
 767                         ehci_readl(ehci, &ehci->regs->frame_index));
 768         size -= temp;
 769         next += temp;
 770
 771         for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) {
 772                 temp = dbg_port_buf (scratch, sizeof scratch, label, i,
 773                                 ehci_readl(ehci,
 774                                         &ehci->regs->port_status[i - 1]));
 775                 temp = scnprintf (next, size, fmt, temp, scratch);
 776                 size -= temp;
 777                 next += temp;
 778                 if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
 779                         temp = scnprintf (next, size,
 780                                         "    debug control %08x\n",
 781                                         ehci_readl(ehci,
 782                                                 &ehci->debug->control));
 783                         size -= temp;
 784                         next += temp;
 785                 }
 786         }
 787
 788         if (ehci->reclaim) {
 789                 temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim);
 790                 size -= temp;
 791                 next += temp;
 792         }
 793
 794 #ifdef EHCI_STATS
 795         temp = scnprintf (next, size,
 796                 "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
 797                 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
 798                 ehci->stats.lost_iaa);
 799         size -= temp;
 800         next += temp;
 801
 802         temp = scnprintf (next, size, "complete %ld unlink %ld\n",
 803                 ehci->stats.complete, ehci->stats.unlink);
 804         size -= temp;
 805         next += temp;
 806 #endif
 807
 808 done:
 809         spin_unlock_irqrestore (&ehci->lock, flags);
 810
 811         return PAGE_SIZE - size;
 812 }
 813
 814 static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
 815                                 ssize_t (*fill_func)(struct debug_buffer *))
 816 {
 817         struct debug_buffer *buf;
 818
 819         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 820
 821         if (buf) {
 822                 buf->bus = bus;
 823                 buf->fill_func = fill_func;
 824                 mutex_init(&buf->mutex);
 825         }
 826
 827         return buf;
 828 }
 829
 830 static int fill_buffer(struct debug_buffer *buf)
 831 {
 832         int ret = 0;
 833
 834         if (!buf->page)
 835                 buf->page = (char *)get_zeroed_page(GFP_KERNEL);
 836
 837         if (!buf->page) {
 838                 ret = -ENOMEM;
 839                 goto out;
 840         }
 841
 842         ret = buf->fill_func(buf);
 843
 844         if (ret >= 0) {
 845                 buf->count = ret;
 846                 ret = 0;
 847         }
 848
 849 out:
 850         return ret;
 851 }
 852
 853 static ssize_t debug_output(struct file *file, char __user *user_buf,
 854                             size_t len, loff_t *offset)
 855 {
 856         struct debug_buffer *buf = file->private_data;
 857         int ret = 0;
 858
 859         mutex_lock(&buf->mutex);
 860         if (buf->count == 0) {
 861                 ret = fill_buffer(buf);
 862                 if (ret != 0) {
 863                         mutex_unlock(&buf->mutex);
 864                         goto out;
 865                 }
 866         }
 867         mutex_unlock(&buf->mutex);
 868
 869         ret = simple_read_from_buffer(user_buf, len, offset,
 870                                       buf->page, buf->count);
 871
 872 out:
 873         return ret;
 874
 875 }
 876
 877 static int debug_close(struct inode *inode, struct file *file)
 878 {
 879         struct debug_buffer *buf = file->private_data;
 880
 881         if (buf) {
 882                 if (buf->page)
 883                         free_page((unsigned long)buf->page);
 884                 kfree(buf);
 885         }
 886
 887         return 0;
 888 }
 889 static int debug_async_open(struct inode *inode, struct file *file)
 890 {
 891         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
 892
 893         return file->private_data ? 0 : -ENOMEM;
 894 }
 895
 896 static int debug_periodic_open(struct inode *inode, struct file *file)
 897 {
 898         file->private_data = alloc_buffer(inode->i_private,
 899                                           fill_periodic_buffer);
 900
 901         return file->private_data ? 0 : -ENOMEM;
 902 }
 903
 904 static int debug_registers_open(struct inode *inode, struct file *file)
 905 {
 906         file->private_data = alloc_buffer(inode->i_private,
 907                                           fill_registers_buffer);
 908
 909         return file->private_data ? 0 : -ENOMEM;
 910 }
 911
 912 static inline void create_debug_files (struct ehci_hcd *ehci)
 913 {
 914         struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
 915
 916         ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
 917         if (!ehci->debug_dir)
 918                 goto dir_error;
 919
 920         ehci->debug_async = debugfs_create_file("async", S_IRUGO,
 921                                                 ehci->debug_dir, bus,
 922                                                 &debug_async_fops);
 923         if (!ehci->debug_async)
 924                 goto async_error;
 925
 926         ehci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
 927                                                    ehci->debug_dir, bus,
 928                                                    &debug_periodic_fops);
 929         if (!ehci->debug_periodic)
 930                 goto periodic_error;
 931
 932         ehci->debug_registers = debugfs_create_file("registers", S_IRUGO,
 933                                                     ehci->debug_dir, bus,
 934                                                     &debug_registers_fops);
 935         if (!ehci->debug_registers)
 936                 goto registers_error;
 937         return;
 938
 939 registers_error:
 940         debugfs_remove(ehci->debug_periodic);
 941 periodic_error:
 942         debugfs_remove(ehci->debug_async);
 943 async_error:
 944         debugfs_remove(ehci->debug_dir);
 945 dir_error:
 946         ehci->debug_periodic = NULL;
 947         ehci->debug_async = NULL;
 948         ehci->debug_dir = NULL;
 949 }
 950
 951 static inline void remove_debug_files (struct ehci_hcd *ehci)
 952 {
 953         debugfs_remove(ehci->debug_registers);
 954         debugfs_remove(ehci->debug_periodic);
 955         debugfs_remove(ehci->debug_async);
 956         debugfs_remove(ehci->debug_dir);
 957 }
 958
 959 #endif /* STUB_DEBUG_FILES */