drivers/usb/host/uhci-debug.c

   1 /*
   2  * UHCI-specific debugging code. Invaluable when something
   3  * goes wrong, but don't get in my face.
   4  *
   5  * Kernel visible pointers are surrounded in []s and bus
   6  * visible pointers are surrounded in ()s
   7  *
   8  * (C) Copyright 1999 Linus Torvalds
   9  * (C) Copyright 1999-2001 Johannes Erdfelt
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/kernel.h>
  14 #include <linux/debugfs.h>
  15 #include <linux/smp_lock.h>
  16 #include <asm/io.h>
  17
  18 #include "uhci-hcd.h"
  19
  20 #define uhci_debug_operations (* (struct file_operations *) NULL)
  21 static struct dentry *uhci_debugfs_root;
  22
  23 #ifdef DEBUG
  24
  25 /* Handle REALLY large printks so we don't overflow buffers */
  26 static void lprintk(char *buf)
  27 {
  28         char *p;
  29
  30         /* Just write one line at a time */
  31         while (buf) {
  32                 p = strchr(buf, '\n');
  33                 if (p)
  34                         *p = 0;
  35                 printk(KERN_DEBUG "%s\n", buf);
  36                 buf = p;
  37                 if (buf)
  38                         buf++;
  39         }
  40 }
  41
  42 static int uhci_show_td(struct uhci_td *td, char *buf, int len, int space)
  43 {
  44         char *out = buf;
  45         char *spid;
  46         u32 status, token;
  47
  48         /* Try to make sure there's enough memory */
  49         if (len < 160)
  50                 return 0;
  51
  52         status = td_status(td);
  53         out += sprintf(out, "%*s[%p] link (%08x) ", space, "", td, le32_to_cpu(td->link));
  54         out += sprintf(out, "e%d %s%s%s%s%s%s%s%s%s%sLength=%x ",
  55                 ((status >> 27) & 3),
  56                 (status & TD_CTRL_SPD) ?      "SPD " : "",
  57                 (status & TD_CTRL_LS) ?       "LS " : "",
  58                 (status & TD_CTRL_IOC) ?      "IOC " : "",
  59                 (status & TD_CTRL_ACTIVE) ?   "Active " : "",
  60                 (status & TD_CTRL_STALLED) ?  "Stalled " : "",
  61                 (status & TD_CTRL_DBUFERR) ?  "DataBufErr " : "",
  62                 (status & TD_CTRL_BABBLE) ?   "Babble " : "",
  63                 (status & TD_CTRL_NAK) ?      "NAK " : "",
  64                 (status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
  65                 (status & TD_CTRL_BITSTUFF) ? "BitStuff " : "",
  66                 status & 0x7ff);
  67
  68         token = td_token(td);
  69         switch (uhci_packetid(token)) {
  70                 case USB_PID_SETUP:
  71                         spid = "SETUP";
  72                         break;
  73                 case USB_PID_OUT:
  74                         spid = "OUT";
  75                         break;
  76                 case USB_PID_IN:
  77                         spid = "IN";
  78                         break;
  79                 default:
  80                         spid = "?";
  81                         break;
  82         }
  83
  84         out += sprintf(out, "MaxLen=%x DT%d EndPt=%x Dev=%x, PID=%x(%s) ",
  85                 token >> 21,
  86                 ((token >> 19) & 1),
  87                 (token >> 15) & 15,
  88                 (token >> 8) & 127,
  89                 (token & 0xff),
  90                 spid);
  91         out += sprintf(out, "(buf=%08x)\n", le32_to_cpu(td->buffer));
  92
  93         return out - buf;
  94 }
  95
  96 static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
  97 {
  98         char *out = buf;
  99         struct uhci_td *td;
 100         int i, nactive, ninactive;
 101         char *ptype;
 102
 103         if (len < 200)
 104                 return 0;
 105
 106         out += sprintf(out, "urb_priv [%p] ", urbp);
 107         out += sprintf(out, "urb [%p] ", urbp->urb);
 108         out += sprintf(out, "qh [%p] ", urbp->qh);
 109         out += sprintf(out, "Dev=%d ", usb_pipedevice(urbp->urb->pipe));
 110         out += sprintf(out, "EP=%x(%s) ", usb_pipeendpoint(urbp->urb->pipe),
 111                         (usb_pipein(urbp->urb->pipe) ? "IN" : "OUT"));
 112
 113         switch (usb_pipetype(urbp->urb->pipe)) {
 114         case PIPE_ISOCHRONOUS: ptype = "ISO"; break;
 115         case PIPE_INTERRUPT: ptype = "INT"; break;
 116         case PIPE_BULK: ptype = "BLK"; break;
 117         default:
 118         case PIPE_CONTROL: ptype = "CTL"; break;
 119         }
 120
 121         out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
 122         out += sprintf(out, " Actlen=%d", urbp->urb->actual_length);
 123
 124         if (urbp->urb->status != -EINPROGRESS)
 125                 out += sprintf(out, " Status=%d", urbp->urb->status);
 126         out += sprintf(out, "\n");
 127
 128         i = nactive = ninactive = 0;
 129         list_for_each_entry(td, &urbp->td_list, list) {
 130                 if (urbp->qh->type != USB_ENDPOINT_XFER_ISOC &&
 131                                 (++i <= 10 || debug > 2)) {
 132                         out += sprintf(out, "%*s%d: ", space + 2, "", i);
 133                         out += uhci_show_td(td, out, len - (out - buf), 0);
 134                 } else {
 135                         if (td_status(td) & TD_CTRL_ACTIVE)
 136                                 ++nactive;
 137                         else
 138                                 ++ninactive;
 139                 }
 140         }
 141         if (nactive + ninactive > 0)
 142                 out += sprintf(out, "%*s[skipped %d inactive and %d active "
 143                                 "TDs]\n",
 144                                 space, "", ninactive, nactive);
 145
 146         return out - buf;
 147 }
 148
 149 static int uhci_show_qh(struct uhci_qh *qh, char *buf, int len, int space)
 150 {
 151         char *out = buf;
 152         int i, nurbs;
 153         __le32 element = qh_element(qh);
 154         char *qtype;
 155
 156         /* Try to make sure there's enough memory */
 157         if (len < 80 * 7)
 158                 return 0;
 159
 160         switch (qh->type) {
 161         case USB_ENDPOINT_XFER_ISOC: qtype = "ISO"; break;
 162         case USB_ENDPOINT_XFER_INT: qtype = "INT"; break;
 163         case USB_ENDPOINT_XFER_BULK: qtype = "BLK"; break;
 164         case USB_ENDPOINT_XFER_CONTROL: qtype = "CTL"; break;
 165         default: qtype = "Skel" ; break;
 166         }
 167
 168         out += sprintf(out, "%*s[%p] %s QH link (%08x) element (%08x)\n",
 169                         space, "", qh, qtype,
 170                         le32_to_cpu(qh->link), le32_to_cpu(element));
 171         if (qh->type == USB_ENDPOINT_XFER_ISOC)
 172                 out += sprintf(out, "%*s    period %d frame %x desc [%p]\n",
 173                                 space, "", qh->period, qh->iso_frame,
 174                                 qh->iso_packet_desc);
 175
 176         if (element & UHCI_PTR_QH)
 177                 out += sprintf(out, "%*s  Element points to QH (bug?)\n", space, "");
 178
 179         if (element & UHCI_PTR_DEPTH)
 180                 out += sprintf(out, "%*s  Depth traverse\n", space, "");
 181
 182         if (element & cpu_to_le32(8))
 183                 out += sprintf(out, "%*s  Bit 3 set (bug?)\n", space, "");
 184
 185         if (!(element & ~(UHCI_PTR_QH | UHCI_PTR_DEPTH)))
 186                 out += sprintf(out, "%*s  Element is NULL (bug?)\n", space, "");
 187
 188         if (list_empty(&qh->queue)) {
 189                 out += sprintf(out, "%*s  queue is empty\n", space, "");
 190         } else {
 191                 struct urb_priv *urbp = list_entry(qh->queue.next,
 192                                 struct urb_priv, node);
 193                 struct uhci_td *td = list_entry(urbp->td_list.next,
 194                                 struct uhci_td, list);
 195
 196                 if (cpu_to_le32(td->dma_handle) != (element & ~UHCI_PTR_BITS))
 197                         out += sprintf(out, "%*s Element != First TD\n",
 198                                         space, "");
 199                 i = nurbs = 0;
 200                 list_for_each_entry(urbp, &qh->queue, node) {
 201                         if (++i <= 10)
 202                                 out += uhci_show_urbp(urbp, out,
 203                                                 len - (out - buf), space + 2);
 204                         else
 205                                 ++nurbs;
 206                 }
 207                 if (nurbs > 0)
 208                         out += sprintf(out, "%*s Skipped %d URBs\n",
 209                                         space, "", nurbs);
 210         }
 211
 212         if (qh->udev) {
 213                 out += sprintf(out, "%*s  Dummy TD\n", space, "");
 214                 out += uhci_show_td(qh->dummy_td, out, len - (out - buf), 0);
 215         }
 216
 217         return out - buf;
 218 }
 219
 220 static const char * const qh_names[] = {
 221   "skel_unlink_qh", "skel_iso_qh",
 222   "skel_int128_qh", "skel_int64_qh",
 223   "skel_int32_qh", "skel_int16_qh",
 224   "skel_int8_qh", "skel_int4_qh",
 225   "skel_int2_qh", "skel_int1_qh",
 226   "skel_ls_control_qh", "skel_fs_control_qh",
 227   "skel_bulk_qh", "skel_term_qh"
 228 };
 229
 230 static int uhci_show_sc(int port, unsigned short status, char *buf, int len)
 231 {
 232         char *out = buf;
 233
 234         /* Try to make sure there's enough memory */
 235         if (len < 160)
 236                 return 0;
 237
 238         out += sprintf(out, "  stat%d     =     %04x  %s%s%s%s%s%s%s%s%s%s\n",
 239                 port,
 240                 status,
 241                 (status & USBPORTSC_SUSP) ?     " Suspend" : "",
 242                 (status & USBPORTSC_OCC) ?      " OverCurrentChange" : "",
 243                 (status & USBPORTSC_OC) ?       " OverCurrent" : "",
 244                 (status & USBPORTSC_PR) ?       " Reset" : "",
 245                 (status & USBPORTSC_LSDA) ?     " LowSpeed" : "",
 246                 (status & USBPORTSC_RD) ?       " ResumeDetect" : "",
 247                 (status & USBPORTSC_PEC) ?      " EnableChange" : "",
 248                 (status & USBPORTSC_PE) ?       " Enabled" : "",
 249                 (status & USBPORTSC_CSC) ?      " ConnectChange" : "",
 250                 (status & USBPORTSC_CCS) ?      " Connected" : "");
 251
 252         return out - buf;
 253 }
 254
 255 static int uhci_show_root_hub_state(struct uhci_hcd *uhci, char *buf, int len)
 256 {
 257         char *out = buf;
 258         char *rh_state;
 259
 260         /* Try to make sure there's enough memory */
 261         if (len < 60)
 262                 return 0;
 263
 264         switch (uhci->rh_state) {
 265             case UHCI_RH_RESET:
 266                 rh_state = "reset";             break;
 267             case UHCI_RH_SUSPENDED:
 268                 rh_state = "suspended";         break;
 269             case UHCI_RH_AUTO_STOPPED:
 270                 rh_state = "auto-stopped";      break;
 271             case UHCI_RH_RESUMING:
 272                 rh_state = "resuming";          break;
 273             case UHCI_RH_SUSPENDING:
 274                 rh_state = "suspending";        break;
 275             case UHCI_RH_RUNNING:
 276                 rh_state = "running";           break;
 277             case UHCI_RH_RUNNING_NODEVS:
 278                 rh_state = "running, no devs";  break;
 279             default:
 280                 rh_state = "?";                 break;
 281         }
 282         out += sprintf(out, "Root-hub state: %s   FSBR: %d\n",
 283                         rh_state, uhci->fsbr_is_on);
 284         return out - buf;
 285 }
 286
 287 static int uhci_show_status(struct uhci_hcd *uhci, char *buf, int len)
 288 {
 289         char *out = buf;
 290         unsigned long io_addr = uhci->io_addr;
 291         unsigned short usbcmd, usbstat, usbint, usbfrnum;
 292         unsigned int flbaseadd;
 293         unsigned char sof;
 294         unsigned short portsc1, portsc2;
 295
 296         /* Try to make sure there's enough memory */
 297         if (len < 80 * 9)
 298                 return 0;
 299
 300         usbcmd    = inw(io_addr + 0);
 301         usbstat   = inw(io_addr + 2);
 302         usbint    = inw(io_addr + 4);
 303         usbfrnum  = inw(io_addr + 6);
 304         flbaseadd = inl(io_addr + 8);
 305         sof       = inb(io_addr + 12);
 306         portsc1   = inw(io_addr + 16);
 307         portsc2   = inw(io_addr + 18);
 308
 309         out += sprintf(out, "  usbcmd    =     %04x   %s%s%s%s%s%s%s%s\n",
 310                 usbcmd,
 311                 (usbcmd & USBCMD_MAXP) ?    "Maxp64 " : "Maxp32 ",
 312                 (usbcmd & USBCMD_CF) ?      "CF " : "",
 313                 (usbcmd & USBCMD_SWDBG) ?   "SWDBG " : "",
 314                 (usbcmd & USBCMD_FGR) ?     "FGR " : "",
 315                 (usbcmd & USBCMD_EGSM) ?    "EGSM " : "",
 316                 (usbcmd & USBCMD_GRESET) ?  "GRESET " : "",
 317                 (usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
 318                 (usbcmd & USBCMD_RS) ?      "RS " : "");
 319
 320         out += sprintf(out, "  usbstat   =     %04x   %s%s%s%s%s%s\n",
 321                 usbstat,
 322                 (usbstat & USBSTS_HCH) ?    "HCHalted " : "",
 323                 (usbstat & USBSTS_HCPE) ?   "HostControllerProcessError " : "",
 324                 (usbstat & USBSTS_HSE) ?    "HostSystemError " : "",
 325                 (usbstat & USBSTS_RD) ?     "ResumeDetect " : "",
 326                 (usbstat & USBSTS_ERROR) ?  "USBError " : "",
 327                 (usbstat & USBSTS_USBINT) ? "USBINT " : "");
 328
 329         out += sprintf(out, "  usbint    =     %04x\n", usbint);
 330         out += sprintf(out, "  usbfrnum  =   (%d)%03x\n", (usbfrnum >> 10) & 1,
 331                 0xfff & (4*(unsigned int)usbfrnum));
 332         out += sprintf(out, "  flbaseadd = %08x\n", flbaseadd);
 333         out += sprintf(out, "  sof       =       %02x\n", sof);
 334         out += uhci_show_sc(1, portsc1, out, len - (out - buf));
 335         out += uhci_show_sc(2, portsc2, out, len - (out - buf));
 336         out += sprintf(out, "Most recent frame: %x (%d)   "
 337                         "Last ISO frame: %x (%d)\n",
 338                         uhci->frame_number, uhci->frame_number & 1023,
 339                         uhci->last_iso_frame, uhci->last_iso_frame & 1023);
 340
 341         return out - buf;
 342 }
 343
 344 static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
 345 {
 346         char *out = buf;
 347         int i, j;
 348         struct uhci_qh *qh;
 349         struct uhci_td *td;
 350         struct list_head *tmp, *head;
 351
 352         out += uhci_show_root_hub_state(uhci, out, len - (out - buf));
 353         out += sprintf(out, "HC status\n");
 354         out += uhci_show_status(uhci, out, len - (out - buf));
 355         if (debug <= 1)
 356                 return out - buf;
 357
 358         out += sprintf(out, "Frame List\n");
 359         for (i = 0; i < UHCI_NUMFRAMES; ++i) {
 360                 td = uhci->frame_cpu[i];
 361                 if (!td)
 362                         continue;
 363
 364                 out += sprintf(out, "- Frame %d\n", i); \
 365                 if (td->dma_handle != (dma_addr_t)uhci->frame[i])
 366                         out += sprintf(out, "    frame list does not match td->dma_handle!\n");
 367
 368                 head = &td->fl_list;
 369                 tmp = head;
 370                 do {
 371                         td = list_entry(tmp, struct uhci_td, fl_list);
 372                         tmp = tmp->next;
 373                         out += uhci_show_td(td, out, len - (out - buf), 4);
 374                 } while (tmp != head);
 375         }
 376
 377         out += sprintf(out, "Skeleton QHs\n");
 378
 379         for (i = 0; i < UHCI_NUM_SKELQH; ++i) {
 380                 int cnt = 0;
 381
 382                 qh = uhci->skelqh[i];
 383                 out += sprintf(out, "- %s\n", qh_names[i]); \
 384                 out += uhci_show_qh(qh, out, len - (out - buf), 4);
 385
 386                 /* Last QH is the Terminating QH, it's different */
 387                 if (i == UHCI_NUM_SKELQH - 1) {
 388                         if (qh->link != UHCI_PTR_TERM)
 389                                 out += sprintf(out, "    bandwidth reclamation on!\n");
 390
 391                         if (qh_element(qh) != cpu_to_le32(uhci->term_td->dma_handle))
 392                                 out += sprintf(out, "    skel_term_qh element is not set to term_td!\n");
 393
 394                         continue;
 395                 }
 396
 397                 j = (i < 9) ? 9 : i+1;          /* Next skeleton */
 398                 head = &qh->node;
 399                 tmp = head->next;
 400
 401                 while (tmp != head) {
 402                         qh = list_entry(tmp, struct uhci_qh, node);
 403                         tmp = tmp->next;
 404                         if (++cnt <= 10)
 405                                 out += uhci_show_qh(qh, out,
 406                                                 len - (out - buf), 4);
 407                 }
 408                 if ((cnt -= 10) > 0)
 409                         out += sprintf(out, "    Skipped %d QHs\n", cnt);
 410
 411                 if (i > 1 && i < UHCI_NUM_SKELQH - 1) {
 412                         if (qh->link !=
 413                             (cpu_to_le32(uhci->skelqh[j]->dma_handle) | UHCI_PTR_QH))
 414                                 out += sprintf(out, "    last QH not linked to next skeleton!\n");
 415                 }
 416         }
 417
 418         return out - buf;
 419 }
 420
 421 #ifdef CONFIG_DEBUG_FS
 422
 423 #define MAX_OUTPUT      (64 * 1024)
 424
 425 struct uhci_debug {
 426         int size;
 427         char *data;
 428 };
 429
 430 static int uhci_debug_open(struct inode *inode, struct file *file)
 431 {
 432         struct uhci_hcd *uhci = inode->u.generic_ip;
 433         struct uhci_debug *up;
 434         int ret = -ENOMEM;
 435         unsigned long flags;
 436
 437         lock_kernel();
 438         up = kmalloc(sizeof(*up), GFP_KERNEL);
 439         if (!up)
 440                 goto out;
 441
 442         up->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
 443         if (!up->data) {
 444                 kfree(up);
 445                 goto out;
 446         }
 447
 448         up->size = 0;
 449         spin_lock_irqsave(&uhci->lock, flags);
 450         if (uhci->is_initialized)
 451                 up->size = uhci_sprint_schedule(uhci, up->data, MAX_OUTPUT);
 452         spin_unlock_irqrestore(&uhci->lock, flags);
 453
 454         file->private_data = up;
 455
 456         ret = 0;
 457 out:
 458         unlock_kernel();
 459         return ret;
 460 }
 461
 462 static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
 463 {
 464         struct uhci_debug *up;
 465         loff_t new = -1;
 466
 467         lock_kernel();
 468         up = file->private_data;
 469
 470         switch (whence) {
 471         case 0:
 472                 new = off;
 473                 break;
 474         case 1:
 475                 new = file->f_pos + off;
 476                 break;
 477         }
 478         if (new < 0 || new > up->size) {
 479                 unlock_kernel();
 480                 return -EINVAL;
 481         }
 482         unlock_kernel();
 483         return (file->f_pos = new);
 484 }
 485
 486 static ssize_t uhci_debug_read(struct file *file, char __user *buf,
 487                                 size_t nbytes, loff_t *ppos)
 488 {
 489         struct uhci_debug *up = file->private_data;
 490         return simple_read_from_buffer(buf, nbytes, ppos, up->data, up->size);
 491 }
 492
 493 static int uhci_debug_release(struct inode *inode, struct file *file)
 494 {
 495         struct uhci_debug *up = file->private_data;
 496
 497         kfree(up->data);
 498         kfree(up);
 499
 500         return 0;
 501 }
 502
 503 #undef uhci_debug_operations
 504 static struct file_operations uhci_debug_operations = {
 505         .owner =        THIS_MODULE,
 506         .open =         uhci_debug_open,
 507         .llseek =       uhci_debug_lseek,
 508         .read =         uhci_debug_read,
 509         .release =      uhci_debug_release,
 510 };
 511
 512 #endif  /* CONFIG_DEBUG_FS */
 513
 514 #else   /* DEBUG */
 515
 516 static inline void lprintk(char *buf)
 517 {}
 518
 519 static inline int uhci_show_qh(struct uhci_qh *qh, char *buf,
 520                 int len, int space)
 521 {
 522         return 0;
 523 }
 524
 525 static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
 526                 char *buf, int len)
 527 {
 528         return 0;
 529 }
 530
 531 #endif