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%s%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                         HCC_LPM(params) ? " LPM" : "",
 109                         HCC_PER_PORT_CHANGE_EVENT(params) ? " ppce" : "",
 110                         HCC_HW_PREFETCH(params) ? " hw prefetch" : "",
 111                         HCC_32FRAME_PERIODIC_LIST(params) ?
 112                                 " 32 peridic list" : "");
 113         }
 114 }
 115 #else
 116
 117 static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}
 118
 119 #endif
 120
 121 #ifdef  DEBUG
 122
 123 static void __maybe_unused
 124 dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
 125 {
 126         ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
 127                 hc32_to_cpup(ehci, &qtd->hw_next),
 128                 hc32_to_cpup(ehci, &qtd->hw_alt_next),
 129                 hc32_to_cpup(ehci, &qtd->hw_token),
 130                 hc32_to_cpup(ehci, &qtd->hw_buf [0]));
 131         if (qtd->hw_buf [1])
 132                 ehci_dbg(ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
 133                         hc32_to_cpup(ehci, &qtd->hw_buf[1]),
 134                         hc32_to_cpup(ehci, &qtd->hw_buf[2]),
 135                         hc32_to_cpup(ehci, &qtd->hw_buf[3]),
 136                         hc32_to_cpup(ehci, &qtd->hw_buf[4]));
 137 }
 138
 139 static void __maybe_unused
 140 dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
 141 {
 142         struct ehci_qh_hw *hw = qh->hw;
 143
 144         ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
 145                 qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
 146         dbg_qtd("overlay", ehci, (struct ehci_qtd *) &hw->hw_qtd_next);
 147 }
 148
 149 static void __maybe_unused
 150 dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
 151 {
 152         ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
 153                 label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
 154                 itd->urb);
 155         ehci_dbg (ehci,
 156                 "  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
 157                 hc32_to_cpu(ehci, itd->hw_transaction[0]),
 158                 hc32_to_cpu(ehci, itd->hw_transaction[1]),
 159                 hc32_to_cpu(ehci, itd->hw_transaction[2]),
 160                 hc32_to_cpu(ehci, itd->hw_transaction[3]),
 161                 hc32_to_cpu(ehci, itd->hw_transaction[4]),
 162                 hc32_to_cpu(ehci, itd->hw_transaction[5]),
 163                 hc32_to_cpu(ehci, itd->hw_transaction[6]),
 164                 hc32_to_cpu(ehci, itd->hw_transaction[7]));
 165         ehci_dbg (ehci,
 166                 "  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
 167                 hc32_to_cpu(ehci, itd->hw_bufp[0]),
 168                 hc32_to_cpu(ehci, itd->hw_bufp[1]),
 169                 hc32_to_cpu(ehci, itd->hw_bufp[2]),
 170                 hc32_to_cpu(ehci, itd->hw_bufp[3]),
 171                 hc32_to_cpu(ehci, itd->hw_bufp[4]),
 172                 hc32_to_cpu(ehci, itd->hw_bufp[5]),
 173                 hc32_to_cpu(ehci, itd->hw_bufp[6]));
 174         ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
 175                 itd->index[0], itd->index[1], itd->index[2],
 176                 itd->index[3], itd->index[4], itd->index[5],
 177                 itd->index[6], itd->index[7]);
 178 }
 179
 180 static void __maybe_unused
 181 dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd)
 182 {
 183         ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
 184                 label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next),
 185                 sitd->urb);
 186         ehci_dbg (ehci,
 187                 "  addr %08x sched %04x result %08x buf %08x %08x\n",
 188                 hc32_to_cpu(ehci, sitd->hw_fullspeed_ep),
 189                 hc32_to_cpu(ehci, sitd->hw_uframe),
 190                 hc32_to_cpu(ehci, sitd->hw_results),
 191                 hc32_to_cpu(ehci, sitd->hw_buf[0]),
 192                 hc32_to_cpu(ehci, sitd->hw_buf[1]));
 193 }
 194
 195 static int __maybe_unused
 196 dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
 197 {
 198         return scnprintf (buf, len,
 199                 "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s%s",
 200                 label, label [0] ? " " : "", status,
 201                 (status & STS_PPCE_MASK) ? " PPCE" : "",
 202                 (status & STS_ASS) ? " Async" : "",
 203                 (status & STS_PSS) ? " Periodic" : "",
 204                 (status & STS_RECL) ? " Recl" : "",
 205                 (status & STS_HALT) ? " Halt" : "",
 206                 (status & STS_IAA) ? " IAA" : "",
 207                 (status & STS_FATAL) ? " FATAL" : "",
 208                 (status & STS_FLR) ? " FLR" : "",
 209                 (status & STS_PCD) ? " PCD" : "",
 210                 (status & STS_ERR) ? " ERR" : "",
 211                 (status & STS_INT) ? " INT" : ""
 212                 );
 213 }
 214
 215 static int __maybe_unused
 216 dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
 217 {
 218         return scnprintf (buf, len,
 219                 "%s%sintrenable %02x%s%s%s%s%s%s%s",
 220                 label, label [0] ? " " : "", enable,
 221                 (enable & STS_PPCE_MASK) ? " PPCE" : "",
 222                 (enable & STS_IAA) ? " IAA" : "",
 223                 (enable & STS_FATAL) ? " FATAL" : "",
 224                 (enable & STS_FLR) ? " FLR" : "",
 225                 (enable & STS_PCD) ? " PCD" : "",
 226                 (enable & STS_ERR) ? " ERR" : "",
 227                 (enable & STS_INT) ? " INT" : ""
 228                 );
 229 }
 230
 231 static const char *const fls_strings [] =
 232     { "1024", "512", "256", "??" };
 233
 234 static int
 235 dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
 236 {
 237         return scnprintf (buf, len,
 238                 "%s%scommand %07x %s%s%s%s%s%s=%d ithresh=%d%s%s%s%s "
 239                 "period=%s%s %s",
 240                 label, label [0] ? " " : "", command,
 241                 (command & CMD_HIRD) ? " HIRD" : "",
 242                 (command & CMD_PPCEE) ? " PPCEE" : "",
 243                 (command & CMD_FSP) ? " FSP" : "",
 244                 (command & CMD_ASPE) ? " ASPE" : "",
 245                 (command & CMD_PSPE) ? " PSPE" : "",
 246                 (command & CMD_PARK) ? " park" : "(park)",
 247                 CMD_PARK_CNT (command),
 248                 (command >> 16) & 0x3f,
 249                 (command & CMD_LRESET) ? " LReset" : "",
 250                 (command & CMD_IAAD) ? " IAAD" : "",
 251                 (command & CMD_ASE) ? " Async" : "",
 252                 (command & CMD_PSE) ? " Periodic" : "",
 253                 fls_strings [(command >> 2) & 0x3],
 254                 (command & CMD_RESET) ? " Reset" : "",
 255                 (command & CMD_RUN) ? "RUN" : "HALT"
 256                 );
 257 }
 258
 259 static int
 260 dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
 261 {
 262         char    *sig;
 263
 264         /* signaling state */
 265         switch (status & (3 << 10)) {
 266         case 0 << 10: sig = "se0"; break;
 267         case 1 << 10: sig = "k"; break;         /* low speed */
 268         case 2 << 10: sig = "j"; break;
 269         default: sig = "?"; break;
 270         }
 271
 272         return scnprintf (buf, len,
 273                 "%s%sport:%d status %06x %d %s%s%s%s%s%s "
 274                 "sig=%s%s%s%s%s%s%s%s%s%s%s",
 275                 label, label [0] ? " " : "", port, status,
 276                 status>>25,/*device address */
 277                 (status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ACK ?
 278                                                 " ACK" : "",
 279                 (status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_NYET ?
 280                                                 " NYET" : "",
 281                 (status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_STALL ?
 282                                                 " STALL" : "",
 283                 (status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ERR ?
 284                                                 " ERR" : "",
 285                 (status & PORT_POWER) ? " POWER" : "",
 286                 (status & PORT_OWNER) ? " OWNER" : "",
 287                 sig,
 288                 (status & PORT_LPM) ? " LPM" : "",
 289                 (status & PORT_RESET) ? " RESET" : "",
 290                 (status & PORT_SUSPEND) ? " SUSPEND" : "",
 291                 (status & PORT_RESUME) ? " RESUME" : "",
 292                 (status & PORT_OCC) ? " OCC" : "",
 293                 (status & PORT_OC) ? " OC" : "",
 294                 (status & PORT_PEC) ? " PEC" : "",
 295                 (status & PORT_PE) ? " PE" : "",
 296                 (status & PORT_CSC) ? " CSC" : "",
 297                 (status & PORT_CONNECT) ? " CONNECT" : "");
 298 }
 299
 300 #else
 301 static inline void __maybe_unused
 302 dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
 303 {}
 304
 305 static inline int __maybe_unused
 306 dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
 307 { return 0; }
 308
 309 static inline int __maybe_unused
 310 dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
 311 { return 0; }
 312
 313 static inline int __maybe_unused
 314 dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
 315 { return 0; }
 316
 317 static inline int __maybe_unused
 318 dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
 319 { return 0; }
 320
 321 #endif  /* DEBUG */
 322
 323 /* functions have the "wrong" filename when they're output... */
 324 #define dbg_status(ehci, label, status) { \
 325         char _buf [80]; \
 326         dbg_status_buf (_buf, sizeof _buf, label, status); \
 327         ehci_dbg (ehci, "%s\n", _buf); \
 328 }
 329
 330 #define dbg_cmd(ehci, label, command) { \
 331         char _buf [80]; \
 332         dbg_command_buf (_buf, sizeof _buf, label, command); \
 333         ehci_dbg (ehci, "%s\n", _buf); \
 334 }
 335
 336 #define dbg_port(ehci, label, port, status) { \
 337         char _buf [80]; \
 338         dbg_port_buf (_buf, sizeof _buf, label, port, status); \
 339         ehci_dbg (ehci, "%s\n", _buf); \
 340 }
 341
 342 /*-------------------------------------------------------------------------*/
 343
 344 #ifdef STUB_DEBUG_FILES
 345
 346 static inline void create_debug_files (struct ehci_hcd *bus) { }
 347 static inline void remove_debug_files (struct ehci_hcd *bus) { }
 348
 349 #else
 350
 351 /* troubleshooting help: expose state in debugfs */
 352
 353 static int debug_async_open(struct inode *, struct file *);
 354 static int debug_periodic_open(struct inode *, struct file *);
 355 static int debug_registers_open(struct inode *, struct file *);
 356 static int debug_async_open(struct inode *, struct file *);
 357 static int debug_lpm_open(struct inode *, struct file *);
 358 static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
 359                                    size_t count, loff_t *ppos);
 360 static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
 361                               size_t count, loff_t *ppos);
 362 static int debug_lpm_close(struct inode *inode, struct file *file);
 363
 364 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
 365 static int debug_close(struct inode *, struct file *);
 366
 367 static const struct file_operations debug_async_fops = {
 368         .owner          = THIS_MODULE,
 369         .open           = debug_async_open,
 370         .read           = debug_output,
 371         .release        = debug_close,
 372 };
 373 static const struct file_operations debug_periodic_fops = {
 374         .owner          = THIS_MODULE,
 375         .open           = debug_periodic_open,
 376         .read           = debug_output,
 377         .release        = debug_close,
 378 };
 379 static const struct file_operations debug_registers_fops = {
 380         .owner          = THIS_MODULE,
 381         .open           = debug_registers_open,
 382         .read           = debug_output,
 383         .release        = debug_close,
 384 };
 385 static const struct file_operations debug_lpm_fops = {
 386         .owner          = THIS_MODULE,
 387         .open           = debug_lpm_open,
 388         .read           = debug_lpm_read,
 389         .write          = debug_lpm_write,
 390         .release        = debug_lpm_close,
 391 };
 392
 393 static struct dentry *ehci_debug_root;
 394
 395 struct debug_buffer {
 396         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
 397         struct usb_bus *bus;
 398         struct mutex mutex;     /* protect filling of buffer */
 399         size_t count;           /* number of characters filled into buffer */
 400         char *output_buf;
 401         size_t alloc_size;
 402 };
 403
 404 #define speed_char(info1) ({ char tmp; \
 405                 switch (info1 & (3 << 12)) { \
 406                 case 0 << 12: tmp = 'f'; break; \
 407                 case 1 << 12: tmp = 'l'; break; \
 408                 case 2 << 12: tmp = 'h'; break; \
 409                 default: tmp = '?'; break; \
 410                 }; tmp; })
 411
 412 static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
 413 {
 414         __u32 v = hc32_to_cpu(ehci, token);
 415
 416         if (v & QTD_STS_ACTIVE)
 417                 return '*';
 418         if (v & QTD_STS_HALT)
 419                 return '-';
 420         if (!IS_SHORT_READ (v))
 421                 return ' ';
 422         /* tries to advance through hw_alt_next */
 423         return '/';
 424 }
 425
 426 static void qh_lines (
 427         struct ehci_hcd *ehci,
 428         struct ehci_qh *qh,
 429         char **nextp,
 430         unsigned *sizep
 431 )
 432 {
 433         u32                     scratch;
 434         u32                     hw_curr;
 435         struct list_head        *entry;
 436         struct ehci_qtd         *td;
 437         unsigned                temp;
 438         unsigned                size = *sizep;
 439         char                    *next = *nextp;
 440         char                    mark;
 441         __le32                  list_end = EHCI_LIST_END(ehci);
 442         struct ehci_qh_hw       *hw = qh->hw;
 443
 444         if (hw->hw_qtd_next == list_end)        /* NEC does this */
 445                 mark = '@';
 446         else
 447                 mark = token_mark(ehci, hw->hw_token);
 448         if (mark == '/') {      /* qh_alt_next controls qh advance? */
 449                 if ((hw->hw_alt_next & QTD_MASK(ehci))
 450                                 == ehci->async->hw->hw_alt_next)
 451                         mark = '#';     /* blocked */
 452                 else if (hw->hw_alt_next == list_end)
 453                         mark = '.';     /* use hw_qtd_next */
 454                 /* else alt_next points to some other qtd */
 455         }
 456         scratch = hc32_to_cpup(ehci, &hw->hw_info1);
 457         hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
 458         temp = scnprintf (next, size,
 459                         "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
 460                         qh, scratch & 0x007f,
 461                         speed_char (scratch),
 462                         (scratch >> 8) & 0x000f,
 463                         scratch, hc32_to_cpup(ehci, &hw->hw_info2),
 464                         hc32_to_cpup(ehci, &hw->hw_token), mark,
 465                         (cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
 466                                 ? "data1" : "data0",
 467                         (hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f);
 468         size -= temp;
 469         next += temp;
 470
 471         /* hc may be modifying the list as we read it ... */
 472         list_for_each (entry, &qh->qtd_list) {
 473                 td = list_entry (entry, struct ehci_qtd, qtd_list);
 474                 scratch = hc32_to_cpup(ehci, &td->hw_token);
 475                 mark = ' ';
 476                 if (hw_curr == td->qtd_dma)
 477                         mark = '*';
 478                 else if (hw->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma))
 479                         mark = '+';
 480                 else if (QTD_LENGTH (scratch)) {
 481                         if (td->hw_alt_next == ehci->async->hw->hw_alt_next)
 482                                 mark = '#';
 483                         else if (td->hw_alt_next != list_end)
 484                                 mark = '/';
 485                 }
 486                 temp = snprintf (next, size,
 487                                 "\n\t%p%c%s len=%d %08x urb %p",
 488                                 td, mark, ({ char *tmp;
 489                                  switch ((scratch>>8)&0x03) {
 490                                  case 0: tmp = "out"; break;
 491                                  case 1: tmp = "in"; break;
 492                                  case 2: tmp = "setup"; break;
 493                                  default: tmp = "?"; break;
 494                                  } tmp;}),
 495                                 (scratch >> 16) & 0x7fff,
 496                                 scratch,
 497                                 td->urb);
 498                 if (size < temp)
 499                         temp = size;
 500                 size -= temp;
 501                 next += temp;
 502                 if (temp == size)
 503                         goto done;
 504         }
 505
 506         temp = snprintf (next, size, "\n");
 507         if (size < temp)
 508                 temp = size;
 509         size -= temp;
 510         next += temp;
 511
 512 done:
 513         *sizep = size;
 514         *nextp = next;
 515 }
 516
 517 static ssize_t fill_async_buffer(struct debug_buffer *buf)
 518 {
 519         struct usb_hcd          *hcd;
 520         struct ehci_hcd         *ehci;
 521         unsigned long           flags;
 522         unsigned                temp, size;
 523         char                    *next;
 524         struct ehci_qh          *qh;
 525
 526         hcd = bus_to_hcd(buf->bus);
 527         ehci = hcd_to_ehci (hcd);
 528         next = buf->output_buf;
 529         size = buf->alloc_size;
 530
 531         *next = 0;
 532
 533         /* dumps a snapshot of the async schedule.
 534          * usually empty except for long-term bulk reads, or head.
 535          * one QH per line, and TDs we know about
 536          */
 537         spin_lock_irqsave (&ehci->lock, flags);
 538         for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
 539                 qh_lines (ehci, qh, &next, &size);
 540         if (ehci->reclaim && size > 0) {
 541                 temp = scnprintf (next, size, "\nreclaim =\n");
 542                 size -= temp;
 543                 next += temp;
 544
 545                 for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
 546                         qh_lines (ehci, qh, &next, &size);
 547         }
 548         spin_unlock_irqrestore (&ehci->lock, flags);
 549
 550         return strlen(buf->output_buf);
 551 }
 552
 553 #define DBG_SCHED_LIMIT 64
 554 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 555 {
 556         struct usb_hcd          *hcd;
 557         struct ehci_hcd         *ehci;
 558         unsigned long           flags;
 559         union ehci_shadow       p, *seen;
 560         unsigned                temp, size, seen_count;
 561         char                    *next;
 562         unsigned                i;
 563         __hc32                  tag;
 564
 565         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
 566                 return 0;
 567         seen_count = 0;
 568
 569         hcd = bus_to_hcd(buf->bus);
 570         ehci = hcd_to_ehci (hcd);
 571         next = buf->output_buf;
 572         size = buf->alloc_size;
 573
 574         temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
 575         size -= temp;
 576         next += temp;
 577
 578         /* dump a snapshot of the periodic schedule.
 579          * iso changes, interrupt usually doesn't.
 580          */
 581         spin_lock_irqsave (&ehci->lock, flags);
 582         for (i = 0; i < ehci->periodic_size; i++) {
 583                 p = ehci->pshadow [i];
 584                 if (likely (!p.ptr))
 585                         continue;
 586                 tag = Q_NEXT_TYPE(ehci, ehci->periodic [i]);
 587
 588                 temp = scnprintf (next, size, "%4d: ", i);
 589                 size -= temp;
 590                 next += temp;
 591
 592                 do {
 593                         struct ehci_qh_hw *hw;
 594
 595                         switch (hc32_to_cpu(ehci, tag)) {
 596                         case Q_TYPE_QH:
 597                                 hw = p.qh->hw;
 598                                 temp = scnprintf (next, size, " qh%d-%04x/%p",
 599                                                 p.qh->period,
 600                                                 hc32_to_cpup(ehci,
 601                                                         &hw->hw_info2)
 602                                                         /* uframe masks */
 603                                                         & (QH_CMASK | QH_SMASK),
 604                                                 p.qh);
 605                                 size -= temp;
 606                                 next += temp;
 607                                 /* don't repeat what follows this qh */
 608                                 for (temp = 0; temp < seen_count; temp++) {
 609                                         if (seen [temp].ptr != p.ptr)
 610                                                 continue;
 611                                         if (p.qh->qh_next.ptr) {
 612                                                 temp = scnprintf (next, size,
 613                                                         " ...");
 614                                                 size -= temp;
 615                                                 next += temp;
 616                                         }
 617                                         break;
 618                                 }
 619                                 /* show more info the first time around */
 620                                 if (temp == seen_count) {
 621                                         u32     scratch = hc32_to_cpup(ehci,
 622                                                         &hw->hw_info1);
 623                                         struct ehci_qtd *qtd;
 624                                         char            *type = "";
 625
 626                                         /* count tds, get ep direction */
 627                                         temp = 0;
 628                                         list_for_each_entry (qtd,
 629                                                         &p.qh->qtd_list,
 630                                                         qtd_list) {
 631                                                 temp++;
 632                                                 switch (0x03 & (hc32_to_cpu(
 633                                                         ehci,
 634                                                         qtd->hw_token) >> 8)) {
 635                                                 case 0: type = "out"; continue;
 636                                                 case 1: type = "in"; continue;
 637                                                 }
 638                                         }
 639
 640                                         temp = scnprintf (next, size,
 641                                                 " (%c%d ep%d%s "
 642                                                 "[%d/%d] q%d p%d)",
 643                                                 speed_char (scratch),
 644                                                 scratch & 0x007f,
 645                                                 (scratch >> 8) & 0x000f, type,
 646                                                 p.qh->usecs, p.qh->c_usecs,
 647                                                 temp,
 648                                                 0x7ff & (scratch >> 16));
 649
 650                                         if (seen_count < DBG_SCHED_LIMIT)
 651                                                 seen [seen_count++].qh = p.qh;
 652                                 } else
 653                                         temp = 0;
 654                                 if (p.qh) {
 655                                         tag = Q_NEXT_TYPE(ehci, hw->hw_next);
 656                                         p = p.qh->qh_next;
 657                                 }
 658                                 break;
 659                         case Q_TYPE_FSTN:
 660                                 temp = scnprintf (next, size,
 661                                         " fstn-%8x/%p", p.fstn->hw_prev,
 662                                         p.fstn);
 663                                 tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
 664                                 p = p.fstn->fstn_next;
 665                                 break;
 666                         case Q_TYPE_ITD:
 667                                 temp = scnprintf (next, size,
 668                                         " itd/%p", p.itd);
 669                                 tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
 670                                 p = p.itd->itd_next;
 671                                 break;
 672                         case Q_TYPE_SITD:
 673                                 temp = scnprintf (next, size,
 674                                         " sitd%d-%04x/%p",
 675                                         p.sitd->stream->interval,
 676                                         hc32_to_cpup(ehci, &p.sitd->hw_uframe)
 677                                                 & 0x0000ffff,
 678                                         p.sitd);
 679                                 tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
 680                                 p = p.sitd->sitd_next;
 681                                 break;
 682                         }
 683                         size -= temp;
 684                         next += temp;
 685                 } while (p.ptr);
 686
 687                 temp = scnprintf (next, size, "\n");
 688                 size -= temp;
 689                 next += temp;
 690         }
 691         spin_unlock_irqrestore (&ehci->lock, flags);
 692         kfree (seen);
 693
 694         return buf->alloc_size - size;
 695 }
 696 #undef DBG_SCHED_LIMIT
 697
 698 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 699 {
 700         struct usb_hcd          *hcd;
 701         struct ehci_hcd         *ehci;
 702         unsigned long           flags;
 703         unsigned                temp, size, i;
 704         char                    *next, scratch [80];
 705         static char             fmt [] = "%*s\n";
 706         static char             label [] = "";
 707
 708         hcd = bus_to_hcd(buf->bus);
 709         ehci = hcd_to_ehci (hcd);
 710         next = buf->output_buf;
 711         size = buf->alloc_size;
 712
 713         spin_lock_irqsave (&ehci->lock, flags);
 714
 715         if (!HCD_HW_ACCESSIBLE(hcd)) {
 716                 size = scnprintf (next, size,
 717                         "bus %s, device %s\n"
 718                         "%s\n"
 719                         "SUSPENDED (no register access)\n",
 720                         hcd->self.controller->bus->name,
 721                         dev_name(hcd->self.controller),
 722                         hcd->product_desc);
 723                 goto done;
 724         }
 725
 726         /* Capability Registers */
 727         i = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
 728         temp = scnprintf (next, size,
 729                 "bus %s, device %s\n"
 730                 "%s\n"
 731                 "EHCI %x.%02x, hcd state %d\n",
 732                 hcd->self.controller->bus->name,
 733                 dev_name(hcd->self.controller),
 734                 hcd->product_desc,
 735                 i >> 8, i & 0x0ff, hcd->state);
 736         size -= temp;
 737         next += temp;
 738
 739 #ifdef  CONFIG_PCI
 740         /* EHCI 0.96 and later may have "extended capabilities" */
 741         if (hcd->self.controller->bus == &pci_bus_type) {
 742                 struct pci_dev  *pdev;
 743                 u32             offset, cap, cap2;
 744                 unsigned        count = 256/4;
 745
 746                 pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
 747                 offset = HCC_EXT_CAPS(ehci_readl(ehci,
 748                                 &ehci->caps->hcc_params));
 749                 while (offset && count--) {
 750                         pci_read_config_dword (pdev, offset, &cap);
 751                         switch (cap & 0xff) {
 752                         case 1:
 753                                 temp = scnprintf (next, size,
 754                                         "ownership %08x%s%s\n", cap,
 755                                         (cap & (1 << 24)) ? " linux" : "",
 756                                         (cap & (1 << 16)) ? " firmware" : "");
 757                                 size -= temp;
 758                                 next += temp;
 759
 760                                 offset += 4;
 761                                 pci_read_config_dword (pdev, offset, &cap2);
 762                                 temp = scnprintf (next, size,
 763                                         "SMI sts/enable 0x%08x\n", cap2);
 764                                 size -= temp;
 765                                 next += temp;
 766                                 break;
 767                         case 0:         /* illegal reserved capability */
 768                                 cap = 0;
 769                                 /* FALLTHROUGH */
 770                         default:                /* unknown */
 771                                 break;
 772                         }
 773                         temp = (cap >> 8) & 0xff;
 774                 }
 775         }
 776 #endif
 777
 778         // FIXME interpret both types of params
 779         i = ehci_readl(ehci, &ehci->caps->hcs_params);
 780         temp = scnprintf (next, size, "structural params 0x%08x\n", i);
 781         size -= temp;
 782         next += temp;
 783
 784         i = ehci_readl(ehci, &ehci->caps->hcc_params);
 785         temp = scnprintf (next, size, "capability params 0x%08x\n", i);
 786         size -= temp;
 787         next += temp;
 788
 789         /* Operational Registers */
 790         temp = dbg_status_buf (scratch, sizeof scratch, label,
 791                         ehci_readl(ehci, &ehci->regs->status));
 792         temp = scnprintf (next, size, fmt, temp, scratch);
 793         size -= temp;
 794         next += temp;
 795
 796         temp = dbg_command_buf (scratch, sizeof scratch, label,
 797                         ehci_readl(ehci, &ehci->regs->command));
 798         temp = scnprintf (next, size, fmt, temp, scratch);
 799         size -= temp;
 800         next += temp;
 801
 802         temp = dbg_intr_buf (scratch, sizeof scratch, label,
 803                         ehci_readl(ehci, &ehci->regs->intr_enable));
 804         temp = scnprintf (next, size, fmt, temp, scratch);
 805         size -= temp;
 806         next += temp;
 807
 808         temp = scnprintf (next, size, "uframe %04x\n",
 809                         ehci_readl(ehci, &ehci->regs->frame_index));
 810         size -= temp;
 811         next += temp;
 812
 813         for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) {
 814                 temp = dbg_port_buf (scratch, sizeof scratch, label, i,
 815                                 ehci_readl(ehci,
 816                                         &ehci->regs->port_status[i - 1]));
 817                 temp = scnprintf (next, size, fmt, temp, scratch);
 818                 size -= temp;
 819                 next += temp;
 820                 if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
 821                         temp = scnprintf (next, size,
 822                                         "    debug control %08x\n",
 823                                         ehci_readl(ehci,
 824                                                 &ehci->debug->control));
 825                         size -= temp;
 826                         next += temp;
 827                 }
 828         }
 829
 830         if (ehci->reclaim) {
 831                 temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim);
 832                 size -= temp;
 833                 next += temp;
 834         }
 835
 836 #ifdef EHCI_STATS
 837         temp = scnprintf (next, size,
 838                 "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
 839                 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
 840                 ehci->stats.lost_iaa);
 841         size -= temp;
 842         next += temp;
 843
 844         temp = scnprintf (next, size, "complete %ld unlink %ld\n",
 845                 ehci->stats.complete, ehci->stats.unlink);
 846         size -= temp;
 847         next += temp;
 848 #endif
 849
 850 done:
 851         spin_unlock_irqrestore (&ehci->lock, flags);
 852
 853         return buf->alloc_size - size;
 854 }
 855
 856 static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
 857                                 ssize_t (*fill_func)(struct debug_buffer *))
 858 {
 859         struct debug_buffer *buf;
 860
 861         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 862
 863         if (buf) {
 864                 buf->bus = bus;
 865                 buf->fill_func = fill_func;
 866                 mutex_init(&buf->mutex);
 867                 buf->alloc_size = PAGE_SIZE;
 868         }
 869
 870         return buf;
 871 }
 872
 873 static int fill_buffer(struct debug_buffer *buf)
 874 {
 875         int ret = 0;
 876
 877         if (!buf->output_buf)
 878                 buf->output_buf = (char *)vmalloc(buf->alloc_size);
 879
 880         if (!buf->output_buf) {
 881                 ret = -ENOMEM;
 882                 goto out;
 883         }
 884
 885         ret = buf->fill_func(buf);
 886
 887         if (ret >= 0) {
 888                 buf->count = ret;
 889                 ret = 0;
 890         }
 891
 892 out:
 893         return ret;
 894 }
 895
 896 static ssize_t debug_output(struct file *file, char __user *user_buf,
 897                             size_t len, loff_t *offset)
 898 {
 899         struct debug_buffer *buf = file->private_data;
 900         int ret = 0;
 901
 902         mutex_lock(&buf->mutex);
 903         if (buf->count == 0) {
 904                 ret = fill_buffer(buf);
 905                 if (ret != 0) {
 906                         mutex_unlock(&buf->mutex);
 907                         goto out;
 908                 }
 909         }
 910         mutex_unlock(&buf->mutex);
 911
 912         ret = simple_read_from_buffer(user_buf, len, offset,
 913                                       buf->output_buf, buf->count);
 914
 915 out:
 916         return ret;
 917
 918 }
 919
 920 static int debug_close(struct inode *inode, struct file *file)
 921 {
 922         struct debug_buffer *buf = file->private_data;
 923
 924         if (buf) {
 925                 vfree(buf->output_buf);
 926                 kfree(buf);
 927         }
 928
 929         return 0;
 930 }
 931 static int debug_async_open(struct inode *inode, struct file *file)
 932 {
 933         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
 934
 935         return file->private_data ? 0 : -ENOMEM;
 936 }
 937
 938 static int debug_periodic_open(struct inode *inode, struct file *file)
 939 {
 940         struct debug_buffer *buf;
 941         buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
 942         if (!buf)
 943                 return -ENOMEM;
 944
 945         buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
 946         file->private_data = buf;
 947         return 0;
 948 }
 949
 950 static int debug_registers_open(struct inode *inode, struct file *file)
 951 {
 952         file->private_data = alloc_buffer(inode->i_private,
 953                                           fill_registers_buffer);
 954
 955         return file->private_data ? 0 : -ENOMEM;
 956 }
 957
 958 static int debug_lpm_open(struct inode *inode, struct file *file)
 959 {
 960         file->private_data = inode->i_private;
 961         return 0;
 962 }
 963
 964 static int debug_lpm_close(struct inode *inode, struct file *file)
 965 {
 966         return 0;
 967 }
 968
 969 static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
 970                                    size_t count, loff_t *ppos)
 971 {
 972         /* TODO: show lpm stats */
 973         return 0;
 974 }
 975
 976 static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
 977                               size_t count, loff_t *ppos)
 978 {
 979         struct usb_hcd          *hcd;
 980         struct ehci_hcd         *ehci;
 981         char buf[50];
 982         size_t len;
 983         u32 temp;
 984         unsigned long port;
 985         u32 __iomem     *portsc ;
 986         u32 params;
 987
 988         hcd = bus_to_hcd(file->private_data);
 989         ehci = hcd_to_ehci(hcd);
 990
 991         len = min(count, sizeof(buf) - 1);
 992         if (copy_from_user(buf, user_buf, len))
 993                 return -EFAULT;
 994         buf[len] = '\0';
 995         if (len > 0 && buf[len - 1] == '\n')
 996                 buf[len - 1] = '\0';
 997
 998         if (strncmp(buf, "enable", 5) == 0) {
 999                 if (strict_strtoul(buf + 7, 10, &port))
1000                         return -EINVAL;
1001                 params = ehci_readl(ehci, &ehci->caps->hcs_params);
1002                 if (port > HCS_N_PORTS(params)) {
1003                         ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
1004                         return -ENODEV;
1005                 }
1006                 portsc = &ehci->regs->port_status[port-1];
1007                 temp = ehci_readl(ehci, portsc);
1008                 if (!(temp & PORT_DEV_ADDR)) {
1009                         ehci_dbg(ehci, "LPM: no device attached\n");
1010                         return -ENODEV;
1011                 }
1012                 temp |= PORT_LPM;
1013                 ehci_writel(ehci, temp, portsc);
1014                 printk(KERN_INFO "force enable LPM for port %lu\n", port);
1015         } else if (strncmp(buf, "hird=", 5) == 0) {
1016                 unsigned long hird;
1017                 if (strict_strtoul(buf + 5, 16, &hird))
1018                         return -EINVAL;
1019                 printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
1020                 temp = ehci_readl(ehci, &ehci->regs->command);
1021                 temp &= ~CMD_HIRD;
1022                 temp |= hird << 24;
1023                 ehci_writel(ehci, temp, &ehci->regs->command);
1024         } else if (strncmp(buf, "disable", 7) == 0) {
1025                 if (strict_strtoul(buf + 8, 10, &port))
1026                         return -EINVAL;
1027                 params = ehci_readl(ehci, &ehci->caps->hcs_params);
1028                 if (port > HCS_N_PORTS(params)) {
1029                         ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
1030                         return -ENODEV;
1031                 }
1032                 portsc = &ehci->regs->port_status[port-1];
1033                 temp = ehci_readl(ehci, portsc);
1034                 if (!(temp & PORT_DEV_ADDR)) {
1035                         ehci_dbg(ehci, "ERR: no device attached\n");
1036                         return -ENODEV;
1037                 }
1038                 temp &= ~PORT_LPM;
1039                 ehci_writel(ehci, temp, portsc);
1040                 printk(KERN_INFO "disabled LPM for port %lu\n", port);
1041         } else
1042                 return -EOPNOTSUPP;
1043         return count;
1044 }
1045
1046 static inline void create_debug_files (struct ehci_hcd *ehci)
1047 {
1048         struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
1049
1050         ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
1051         if (!ehci->debug_dir)
1052                 return;
1053
1054         if (!debugfs_create_file("async", S_IRUGO, ehci->debug_dir, bus,
1055                                                 &debug_async_fops))
1056                 goto file_error;
1057
1058         if (!debugfs_create_file("periodic", S_IRUGO, ehci->debug_dir, bus,
1059                                                 &debug_periodic_fops))
1060                 goto file_error;
1061
1062         if (!debugfs_create_file("registers", S_IRUGO, ehci->debug_dir, bus,
1063                                                     &debug_registers_fops))
1064                 goto file_error;
1065
1066         if (!debugfs_create_file("lpm", S_IRUGO|S_IWUGO, ehci->debug_dir, bus,
1067                                                     &debug_lpm_fops))
1068                 goto file_error;
1069
1070         return;
1071
1072 file_error:
1073         debugfs_remove_recursive(ehci->debug_dir);
1074 }
1075
1076 static inline void remove_debug_files (struct ehci_hcd *ehci)
1077 {
1078         debugfs_remove_recursive(ehci->debug_dir);
1079 }
1080
1081 #endif /* STUB_DEBUG_FILES */