sys/dev/pci/pci_user.c

   1 /*-
   2  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include "opt_bus.h"    /* XXX trim includes */
  31 #include "opt_compat.h"
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/malloc.h>
  36 #include <sys/module.h>
  37 #include <sys/linker.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/conf.h>
  40 #include <sys/kernel.h>
  41 #include <sys/proc.h>
  42 #include <sys/queue.h>
  43 #include <sys/types.h>
  44
  45 #include <vm/vm.h>
  46 #include <vm/pmap.h>
  47 #include <vm/vm_extern.h>
  48
  49 #include <sys/bus.h>
  50 #include <machine/bus.h>
  51 #include <sys/rman.h>
  52 #include <machine/resource.h>
  53
  54 #include <sys/pciio.h>
  55 #include <dev/pci/pcireg.h>
  56 #include <dev/pci/pcivar.h>
  57
  58 #include "pcib_if.h"
  59 #include "pci_if.h"
  60
  61 /*
  62  * This is the user interface to PCI configuration space.
  63  */
  64
  65 static d_open_t         pci_open;
  66 static d_close_t        pci_close;
  67 static int      pci_conf_match(struct pci_match_conf *matches, int num_matches,
  68                                struct pci_conf *match_buf);
  69 static d_ioctl_t        pci_ioctl;
  70
  71 struct cdevsw pcicdev = {
  72         .d_version =    D_VERSION,
  73         .d_flags =      D_NEEDGIANT,
  74         .d_open =       pci_open,
  75         .d_close =      pci_close,
  76         .d_ioctl =      pci_ioctl,
  77         .d_name =       "pci",
  78 };
  79
  80 static int
  81 pci_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
  82 {
  83         int error;
  84
  85         if (oflags & FWRITE) {
  86                 error = securelevel_gt(td->td_ucred, 0);
  87                 if (error)
  88                         return (error);
  89         }
  90
  91         return (0);
  92 }
  93
  94 static int
  95 pci_close(struct cdev *dev, int flag, int devtype, struct thread *td)
  96 {
  97         return 0;
  98 }
  99
 100 /*
 101  * Match a single pci_conf structure against an array of pci_match_conf
 102  * structures.  The first argument, 'matches', is an array of num_matches
 103  * pci_match_conf structures.  match_buf is a pointer to the pci_conf
 104  * structure that will be compared to every entry in the matches array.
 105  * This function returns 1 on failure, 0 on success.
 106  */
 107 static int
 108 pci_conf_match(struct pci_match_conf *matches, int num_matches,
 109                struct pci_conf *match_buf)
 110 {
 111         int i;
 112
 113         if ((matches == NULL) || (match_buf == NULL) || (num_matches <= 0))
 114                 return(1);
 115
 116         for (i = 0; i < num_matches; i++) {
 117                 /*
 118                  * I'm not sure why someone would do this...but...
 119                  */
 120                 if (matches[i].flags == PCI_GETCONF_NO_MATCH)
 121                         continue;
 122
 123                 /*
 124                  * Look at each of the match flags.  If it's set, do the
 125                  * comparison.  If the comparison fails, we don't have a
 126                  * match, go on to the next item if there is one.
 127                  */
 128                 if (((matches[i].flags & PCI_GETCONF_MATCH_DOMAIN) != 0)
 129                  && (match_buf->pc_sel.pc_domain !=
 130                  matches[i].pc_sel.pc_domain))
 131                         continue;
 132
 133                 if (((matches[i].flags & PCI_GETCONF_MATCH_BUS) != 0)
 134                  && (match_buf->pc_sel.pc_bus != matches[i].pc_sel.pc_bus))
 135                         continue;
 136
 137                 if (((matches[i].flags & PCI_GETCONF_MATCH_DEV) != 0)
 138                  && (match_buf->pc_sel.pc_dev != matches[i].pc_sel.pc_dev))
 139                         continue;
 140
 141                 if (((matches[i].flags & PCI_GETCONF_MATCH_FUNC) != 0)
 142                  && (match_buf->pc_sel.pc_func != matches[i].pc_sel.pc_func))
 143                         continue;
 144
 145                 if (((matches[i].flags & PCI_GETCONF_MATCH_VENDOR) != 0)
 146                  && (match_buf->pc_vendor != matches[i].pc_vendor))
 147                         continue;
 148
 149                 if (((matches[i].flags & PCI_GETCONF_MATCH_DEVICE) != 0)
 150                  && (match_buf->pc_device != matches[i].pc_device))
 151                         continue;
 152
 153                 if (((matches[i].flags & PCI_GETCONF_MATCH_CLASS) != 0)
 154                  && (match_buf->pc_class != matches[i].pc_class))
 155                         continue;
 156
 157                 if (((matches[i].flags & PCI_GETCONF_MATCH_UNIT) != 0)
 158                  && (match_buf->pd_unit != matches[i].pd_unit))
 159                         continue;
 160
 161                 if (((matches[i].flags & PCI_GETCONF_MATCH_NAME) != 0)
 162                  && (strncmp(matches[i].pd_name, match_buf->pd_name,
 163                              sizeof(match_buf->pd_name)) != 0))
 164                         continue;
 165
 166                 return(0);
 167         }
 168
 169         return(1);
 170 }
 171
 172 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
 173     defined(COMPAT_FREEBSD6)
 174 #define PRE7_COMPAT
 175
 176 typedef enum {
 177         PCI_GETCONF_NO_MATCH_OLD        = 0x00,
 178         PCI_GETCONF_MATCH_BUS_OLD       = 0x01,
 179         PCI_GETCONF_MATCH_DEV_OLD       = 0x02,
 180         PCI_GETCONF_MATCH_FUNC_OLD      = 0x04,
 181         PCI_GETCONF_MATCH_NAME_OLD      = 0x08,
 182         PCI_GETCONF_MATCH_UNIT_OLD      = 0x10,
 183         PCI_GETCONF_MATCH_VENDOR_OLD    = 0x20,
 184         PCI_GETCONF_MATCH_DEVICE_OLD    = 0x40,
 185         PCI_GETCONF_MATCH_CLASS_OLD     = 0x80
 186 } pci_getconf_flags_old;
 187
 188 struct pcisel_old {
 189         u_int8_t        pc_bus;         /* bus number */
 190         u_int8_t        pc_dev;         /* device on this bus */
 191         u_int8_t        pc_func;        /* function on this device */
 192 };
 193
 194 struct pci_conf_old {
 195         struct pcisel_old pc_sel;       /* bus+slot+function */
 196         u_int8_t        pc_hdr;         /* PCI header type */
 197         u_int16_t       pc_subvendor;   /* card vendor ID */
 198         u_int16_t       pc_subdevice;   /* card device ID, assigned by
 199                                            card vendor */
 200         u_int16_t       pc_vendor;      /* chip vendor ID */
 201         u_int16_t       pc_device;      /* chip device ID, assigned by
 202                                            chip vendor */
 203         u_int8_t        pc_class;       /* chip PCI class */
 204         u_int8_t        pc_subclass;    /* chip PCI subclass */
 205         u_int8_t        pc_progif;      /* chip PCI programming interface */
 206         u_int8_t        pc_revid;       /* chip revision ID */
 207         char            pd_name[PCI_MAXNAMELEN + 1];  /* device name */
 208         u_long          pd_unit;        /* device unit number */
 209 };
 210
 211 struct pci_match_conf_old {
 212         struct pcisel_old       pc_sel;         /* bus+slot+function */
 213         char                    pd_name[PCI_MAXNAMELEN + 1];  /* device name */
 214         u_long                  pd_unit;        /* Unit number */
 215         u_int16_t               pc_vendor;      /* PCI Vendor ID */
 216         u_int16_t               pc_device;      /* PCI Device ID */
 217         u_int8_t                pc_class;       /* PCI class */
 218         pci_getconf_flags_old   flags;          /* Matching expression */
 219 };
 220
 221 struct pci_io_old {
 222         struct pcisel_old pi_sel;       /* device to operate on */
 223         int             pi_reg;         /* configuration register to examine */
 224         int             pi_width;       /* width (in bytes) of read or write */
 225         u_int32_t       pi_data;        /* data to write or result of read */
 226 };
 227
 228 #define PCIOCGETCONF_OLD        _IOWR('p', 1, struct pci_conf_io)
 229 #define PCIOCREAD_OLD           _IOWR('p', 2, struct pci_io_old)
 230 #define PCIOCWRITE_OLD          _IOWR('p', 3, struct pci_io_old)
 231
 232 static int      pci_conf_match_old(struct pci_match_conf_old *matches,
 233                     int num_matches, struct pci_conf *match_buf);
 234
 235 static int
 236 pci_conf_match_old(struct pci_match_conf_old *matches, int num_matches,
 237     struct pci_conf *match_buf)
 238 {
 239         int i;
 240
 241         if ((matches == NULL) || (match_buf == NULL) || (num_matches <= 0))
 242                 return(1);
 243
 244         for (i = 0; i < num_matches; i++) {
 245                 if (match_buf->pc_sel.pc_domain != 0)
 246                         continue;
 247
 248                 /*
 249                  * I'm not sure why someone would do this...but...
 250                  */
 251                 if (matches[i].flags == PCI_GETCONF_NO_MATCH_OLD)
 252                         continue;
 253
 254                 /*
 255                  * Look at each of the match flags.  If it's set, do the
 256                  * comparison.  If the comparison fails, we don't have a
 257                  * match, go on to the next item if there is one.
 258                  */
 259                 if (((matches[i].flags & PCI_GETCONF_MATCH_BUS_OLD) != 0)
 260                  && (match_buf->pc_sel.pc_bus != matches[i].pc_sel.pc_bus))
 261                         continue;
 262
 263                 if (((matches[i].flags & PCI_GETCONF_MATCH_DEV_OLD) != 0)
 264                  && (match_buf->pc_sel.pc_dev != matches[i].pc_sel.pc_dev))
 265                         continue;
 266
 267                 if (((matches[i].flags & PCI_GETCONF_MATCH_FUNC_OLD) != 0)
 268                  && (match_buf->pc_sel.pc_func != matches[i].pc_sel.pc_func))
 269                         continue;
 270
 271                 if (((matches[i].flags & PCI_GETCONF_MATCH_VENDOR_OLD) != 0)
 272                  && (match_buf->pc_vendor != matches[i].pc_vendor))
 273                         continue;
 274
 275                 if (((matches[i].flags & PCI_GETCONF_MATCH_DEVICE_OLD) != 0)
 276                  && (match_buf->pc_device != matches[i].pc_device))
 277                         continue;
 278
 279                 if (((matches[i].flags & PCI_GETCONF_MATCH_CLASS_OLD) != 0)
 280                  && (match_buf->pc_class != matches[i].pc_class))
 281                         continue;
 282
 283                 if (((matches[i].flags & PCI_GETCONF_MATCH_UNIT_OLD) != 0)
 284                  && (match_buf->pd_unit != matches[i].pd_unit))
 285                         continue;
 286
 287                 if (((matches[i].flags & PCI_GETCONF_MATCH_NAME_OLD) != 0)
 288                  && (strncmp(matches[i].pd_name, match_buf->pd_name,
 289                              sizeof(match_buf->pd_name)) != 0))
 290                         continue;
 291
 292                 return(0);
 293         }
 294
 295         return(1);
 296 }
 297
 298 #endif
 299
 300 static int
 301 pci_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
 302 {
 303         device_t pcidev, brdev;
 304         void *confdata;
 305         const char *name;
 306         struct devlist *devlist_head;
 307         struct pci_conf_io *cio;
 308         struct pci_devinfo *dinfo;
 309         struct pci_io *io;
 310         struct pci_bar_io *bio;
 311         struct pci_match_conf *pattern_buf;
 312         struct resource_list_entry *rle;
 313         uint32_t value;
 314         size_t confsz, iolen, pbufsz;
 315         int error, ionum, i, num_patterns;
 316 #ifdef PRE7_COMPAT
 317         struct pci_conf_old conf_old;
 318         struct pci_io iodata;
 319         struct pci_io_old *io_old;
 320         struct pci_match_conf_old *pattern_buf_old;
 321
 322         io_old = NULL;
 323         pattern_buf_old = NULL;
 324
 325         if (!(flag & FWRITE) && cmd != PCIOCGETBAR &&
 326             cmd != PCIOCGETCONF && cmd != PCIOCGETCONF_OLD)
 327                 return EPERM;
 328 #else
 329         if (!(flag & FWRITE) && cmd != PCIOCGETBAR && cmd != PCIOCGETCONF)
 330                 return EPERM;
 331 #endif
 332
 333         switch(cmd) {
 334 #ifdef PRE7_COMPAT
 335         case PCIOCGETCONF_OLD:
 336                 /* FALLTHROUGH */
 337 #endif
 338         case PCIOCGETCONF:
 339                 cio = (struct pci_conf_io *)data;
 340
 341                 pattern_buf = NULL;
 342                 num_patterns = 0;
 343                 dinfo = NULL;
 344
 345                 cio->num_matches = 0;
 346
 347                 /*
 348                  * If the user specified an offset into the device list,
 349                  * but the list has changed since they last called this
 350                  * ioctl, tell them that the list has changed.  They will
 351                  * have to get the list from the beginning.
 352                  */
 353                 if ((cio->offset != 0)
 354                  && (cio->generation != pci_generation)){
 355                         cio->status = PCI_GETCONF_LIST_CHANGED;
 356                         error = 0;
 357                         break;
 358                 }
 359
 360                 /*
 361                  * Check to see whether the user has asked for an offset
 362                  * past the end of our list.
 363                  */
 364                 if (cio->offset >= pci_numdevs) {
 365                         cio->status = PCI_GETCONF_LAST_DEVICE;
 366                         error = 0;
 367                         break;
 368                 }
 369
 370                 /* get the head of the device queue */
 371                 devlist_head = &pci_devq;
 372
 373                 /*
 374                  * Determine how much room we have for pci_conf structures.
 375                  * Round the user's buffer size down to the nearest
 376                  * multiple of sizeof(struct pci_conf) in case the user
 377                  * didn't specify a multiple of that size.
 378                  */
 379 #ifdef PRE7_COMPAT
 380                 if (cmd == PCIOCGETCONF_OLD)
 381                         confsz = sizeof(struct pci_conf_old);
 382                 else
 383 #endif
 384                         confsz = sizeof(struct pci_conf);
 385                 iolen = min(cio->match_buf_len - (cio->match_buf_len % confsz),
 386                     pci_numdevs * confsz);
 387
 388                 /*
 389                  * Since we know that iolen is a multiple of the size of
 390                  * the pciconf union, it's okay to do this.
 391                  */
 392                 ionum = iolen / confsz;
 393
 394                 /*
 395                  * If this test is true, the user wants the pci_conf
 396                  * structures returned to match the supplied entries.
 397                  */
 398                 if ((cio->num_patterns > 0) && (cio->num_patterns < pci_numdevs)
 399                  && (cio->pat_buf_len > 0)) {
 400                         /*
 401                          * pat_buf_len needs to be:
 402                          * num_patterns * sizeof(struct pci_match_conf)
 403                          * While it is certainly possible the user just
 404                          * allocated a large buffer, but set the number of
 405                          * matches correctly, it is far more likely that
 406                          * their kernel doesn't match the userland utility
 407                          * they're using.  It's also possible that the user
 408                          * forgot to initialize some variables.  Yes, this
 409                          * may be overly picky, but I hazard to guess that
 410                          * it's far more likely to just catch folks that
 411                          * updated their kernel but not their userland.
 412                          */
 413 #ifdef PRE7_COMPAT
 414                         if (cmd == PCIOCGETCONF_OLD)
 415                                 pbufsz = sizeof(struct pci_match_conf_old);
 416                         else
 417 #endif
 418                                 pbufsz = sizeof(struct pci_match_conf);
 419                         if (cio->num_patterns * pbufsz != cio->pat_buf_len) {
 420                                 /* The user made a mistake, return an error. */
 421                                 cio->status = PCI_GETCONF_ERROR;
 422                                 error = EINVAL;
 423                                 break;
 424                         }
 425
 426                         /*
 427                          * Allocate a buffer to hold the patterns.
 428                          */
 429 #ifdef PRE7_COMPAT
 430                         if (cmd == PCIOCGETCONF_OLD) {
 431                                 pattern_buf_old = malloc(cio->pat_buf_len,
 432                                     M_TEMP, M_WAITOK);
 433                                 error = copyin(cio->patterns,
 434                                     pattern_buf_old, cio->pat_buf_len);
 435                         } else
 436 #endif
 437                         {
 438                                 pattern_buf = malloc(cio->pat_buf_len, M_TEMP,
 439                                     M_WAITOK);
 440                                 error = copyin(cio->patterns, pattern_buf,
 441                                     cio->pat_buf_len);
 442                         }
 443                         if (error != 0) {
 444                                 error = EINVAL;
 445                                 goto getconfexit;
 446                         }
 447                         num_patterns = cio->num_patterns;
 448                 } else if ((cio->num_patterns > 0)
 449                         || (cio->pat_buf_len > 0)) {
 450                         /*
 451                          * The user made a mistake, spit out an error.
 452                          */
 453                         cio->status = PCI_GETCONF_ERROR;
 454                         error = EINVAL;
 455                         break;
 456                 }
 457
 458                 /*
 459                  * Go through the list of devices and copy out the devices
 460                  * that match the user's criteria.
 461                  */
 462                 for (cio->num_matches = 0, error = 0, i = 0,
 463                      dinfo = STAILQ_FIRST(devlist_head);
 464                      (dinfo != NULL) && (cio->num_matches < ionum)
 465                      && (error == 0) && (i < pci_numdevs) && (dinfo != NULL);
 466                      dinfo = STAILQ_NEXT(dinfo, pci_links), i++) {
 467
 468                         if (i < cio->offset)
 469                                 continue;
 470
 471                         /* Populate pd_name and pd_unit */
 472                         name = NULL;
 473                         if (dinfo->cfg.dev)
 474                                 name = device_get_name(dinfo->cfg.dev);
 475                         if (name) {
 476                                 strncpy(dinfo->conf.pd_name, name,
 477                                         sizeof(dinfo->conf.pd_name));
 478                                 dinfo->conf.pd_name[PCI_MAXNAMELEN] = 0;
 479                                 dinfo->conf.pd_unit =
 480                                         device_get_unit(dinfo->cfg.dev);
 481                         } else {
 482                                 dinfo->conf.pd_name[0] = '\0';
 483                                 dinfo->conf.pd_unit = 0;
 484                         }
 485
 486 #ifdef PRE7_COMPAT
 487                         if ((cmd == PCIOCGETCONF_OLD &&
 488                             (pattern_buf_old == NULL ||
 489                             pci_conf_match_old(pattern_buf_old, num_patterns,
 490                             &dinfo->conf) == 0)) ||
 491                             (cmd == PCIOCGETCONF &&
 492                             (pattern_buf == NULL ||
 493                             pci_conf_match(pattern_buf, num_patterns,
 494                             &dinfo->conf) == 0))) {
 495 #else
 496                         if (pattern_buf == NULL ||
 497                             pci_conf_match(pattern_buf, num_patterns,
 498                             &dinfo->conf) == 0) {
 499 #endif
 500                                 /*
 501                                  * If we've filled up the user's buffer,
 502                                  * break out at this point.  Since we've
 503                                  * got a match here, we'll pick right back
 504                                  * up at the matching entry.  We can also
 505                                  * tell the user that there are more matches
 506                                  * left.
 507                                  */
 508                                 if (cio->num_matches >= ionum)
 509                                         break;
 510
 511 #ifdef PRE7_COMPAT
 512                                 if (cmd == PCIOCGETCONF_OLD) {
 513                                         conf_old.pc_sel.pc_bus =
 514                                             dinfo->conf.pc_sel.pc_bus;
 515                                         conf_old.pc_sel.pc_dev =
 516                                             dinfo->conf.pc_sel.pc_dev;
 517                                         conf_old.pc_sel.pc_func =
 518                                             dinfo->conf.pc_sel.pc_func;
 519                                         conf_old.pc_hdr = dinfo->conf.pc_hdr;
 520                                         conf_old.pc_subvendor =
 521                                             dinfo->conf.pc_subvendor;
 522                                         conf_old.pc_subdevice =
 523                                             dinfo->conf.pc_subdevice;
 524                                         conf_old.pc_vendor =
 525                                             dinfo->conf.pc_vendor;
 526                                         conf_old.pc_device =
 527                                             dinfo->conf.pc_device;
 528                                         conf_old.pc_class =
 529                                             dinfo->conf.pc_class;
 530                                         conf_old.pc_subclass =
 531                                             dinfo->conf.pc_subclass;
 532                                         conf_old.pc_progif =
 533                                             dinfo->conf.pc_progif;
 534                                         conf_old.pc_revid =
 535                                             dinfo->conf.pc_revid;
 536                                         strncpy(conf_old.pd_name,
 537                                             dinfo->conf.pd_name,
 538                                             sizeof(conf_old.pd_name));
 539                                         conf_old.pd_name[PCI_MAXNAMELEN] = 0;
 540                                         conf_old.pd_unit =
 541                                             dinfo->conf.pd_unit;
 542                                         confdata = &conf_old;
 543                                 } else
 544 #endif
 545                                         confdata = &dinfo->conf;
 546                                 /* Only if we can copy it out do we count it. */
 547                                 if (!(error = copyout(confdata,
 548                                     (caddr_t)cio->matches +
 549                                     confsz * cio->num_matches, confsz)))
 550                                         cio->num_matches++;
 551                         }
 552                 }
 553
 554                 /*
 555                  * Set the pointer into the list, so if the user is getting
 556                  * n records at a time, where n < pci_numdevs,
 557                  */
 558                 cio->offset = i;
 559
 560                 /*
 561                  * Set the generation, the user will need this if they make
 562                  * another ioctl call with offset != 0.
 563                  */
 564                 cio->generation = pci_generation;
 565
 566                 /*
 567                  * If this is the last device, inform the user so he won't
 568                  * bother asking for more devices.  If dinfo isn't NULL, we
 569                  * know that there are more matches in the list because of
 570                  * the way the traversal is done.
 571                  */
 572                 if (dinfo == NULL)
 573                         cio->status = PCI_GETCONF_LAST_DEVICE;
 574                 else
 575                         cio->status = PCI_GETCONF_MORE_DEVS;
 576
 577 getconfexit:
 578                 if (pattern_buf != NULL)
 579                         free(pattern_buf, M_TEMP);
 580 #ifdef PRE7_COMPAT
 581                 if (pattern_buf_old != NULL)
 582                         free(pattern_buf_old, M_TEMP);
 583 #endif
 584
 585                 break;
 586
 587 #ifdef PRE7_COMPAT
 588         case PCIOCREAD_OLD:
 589         case PCIOCWRITE_OLD:
 590                 io_old = (struct pci_io_old *)data;
 591                 iodata.pi_sel.pc_domain = 0;
 592                 iodata.pi_sel.pc_bus = io_old->pi_sel.pc_bus;
 593                 iodata.pi_sel.pc_dev = io_old->pi_sel.pc_dev;
 594                 iodata.pi_sel.pc_func = io_old->pi_sel.pc_func;
 595                 iodata.pi_reg = io_old->pi_reg;
 596                 iodata.pi_width = io_old->pi_width;
 597                 iodata.pi_data = io_old->pi_data;
 598                 data = (caddr_t)&iodata;
 599                 /* FALLTHROUGH */
 600 #endif
 601         case PCIOCREAD:
 602         case PCIOCWRITE:
 603                 io = (struct pci_io *)data;
 604                 switch(io->pi_width) {
 605                 case 4:
 606                 case 2:
 607                 case 1:
 608                         /* Make sure register is not negative and aligned. */
 609                         if (io->pi_reg < 0 ||
 610                             io->pi_reg & (io->pi_width - 1)) {
 611                                 error = EINVAL;
 612                                 break;
 613                         }
 614                         /*
 615                          * Assume that the user-level bus number is
 616                          * in fact the physical PCI bus number.
 617                          * Look up the grandparent, i.e. the bridge device,
 618                          * so that we can issue configuration space cycles.
 619                          */
 620                         pcidev = pci_find_dbsf(io->pi_sel.pc_domain,
 621                             io->pi_sel.pc_bus, io->pi_sel.pc_dev,
 622                             io->pi_sel.pc_func);
 623                         if (pcidev) {
 624                                 brdev = device_get_parent(
 625                                     device_get_parent(pcidev));
 626
 627 #ifdef PRE7_COMPAT
 628                                 if (cmd == PCIOCWRITE || cmd == PCIOCWRITE_OLD)
 629 #else
 630                                 if (cmd == PCIOCWRITE)
 631 #endif
 632                                         PCIB_WRITE_CONFIG(brdev,
 633                                                           io->pi_sel.pc_bus,
 634                                                           io->pi_sel.pc_dev,
 635                                                           io->pi_sel.pc_func,
 636                                                           io->pi_reg,
 637                                                           io->pi_data,
 638                                                           io->pi_width);
 639 #ifdef PRE7_COMPAT
 640                                 else if (cmd == PCIOCREAD_OLD)
 641                                         io_old->pi_data =
 642                                                 PCIB_READ_CONFIG(brdev,
 643                                                           io->pi_sel.pc_bus,
 644                                                           io->pi_sel.pc_dev,
 645                                                           io->pi_sel.pc_func,
 646                                                           io->pi_reg,
 647                                                           io->pi_width);
 648 #endif
 649                                 else
 650                                         io->pi_data =
 651                                                 PCIB_READ_CONFIG(brdev,
 652                                                           io->pi_sel.pc_bus,
 653                                                           io->pi_sel.pc_dev,
 654                                                           io->pi_sel.pc_func,
 655                                                           io->pi_reg,
 656                                                           io->pi_width);
 657                                 error = 0;
 658                         } else {
 659 #ifdef COMPAT_FREEBSD4
 660                                 if (cmd == PCIOCREAD_OLD) {
 661                                         io_old->pi_data = -1;
 662                                         error = 0;
 663                                 } else
 664 #endif
 665                                         error = ENODEV;
 666                         }
 667                         break;
 668                 default:
 669                         error = EINVAL;
 670                         break;
 671                 }
 672                 break;
 673
 674         case PCIOCGETBAR:
 675                 bio = (struct pci_bar_io *)data;
 676
 677                 /*
 678                  * Assume that the user-level bus number is
 679                  * in fact the physical PCI bus number.
 680                  */
 681                 pcidev = pci_find_dbsf(bio->pbi_sel.pc_domain,
 682                     bio->pbi_sel.pc_bus, bio->pbi_sel.pc_dev,
 683                     bio->pbi_sel.pc_func);
 684                 if (pcidev == NULL) {
 685                         error = ENODEV;
 686                         break;
 687                 }
 688                 dinfo = device_get_ivars(pcidev);
 689
 690                 /*
 691                  * Look for a resource list entry matching the requested BAR.
 692                  *
 693                  * XXX: This will not find BARs that are not initialized, but
 694                  * maybe that is ok?
 695                  */
 696                 rle = resource_list_find(&dinfo->resources, SYS_RES_MEMORY,
 697                     bio->pbi_reg);
 698                 if (rle == NULL)
 699                         rle = resource_list_find(&dinfo->resources,
 700                             SYS_RES_IOPORT, bio->pbi_reg);
 701                 if (rle == NULL || rle->res == NULL) {
 702                         error = EINVAL;
 703                         break;
 704                 }
 705
 706                 /*
 707                  * Ok, we have a resource for this BAR.  Read the lower
 708                  * 32 bits to get any flags.
 709                  */
 710                 value = pci_read_config(pcidev, bio->pbi_reg, 4);
 711                 if (PCI_BAR_MEM(value)) {
 712                         if (rle->type != SYS_RES_MEMORY) {
 713                                 error = EINVAL;
 714                                 break;
 715                         }
 716                         value &= ~PCIM_BAR_MEM_BASE;
 717                 } else {
 718                         if (rle->type != SYS_RES_IOPORT) {
 719                                 error = EINVAL;
 720                                 break;
 721                         }
 722                         value &= ~PCIM_BAR_IO_BASE;
 723                 }
 724                 bio->pbi_base = rman_get_start(rle->res) | value;
 725                 bio->pbi_length = rman_get_size(rle->res);
 726
 727                 /*
 728                  * Check the command register to determine if this BAR
 729                  * is enabled.
 730                  */
 731                 value = pci_read_config(pcidev, PCIR_COMMAND, 2);
 732                 if (rle->type == SYS_RES_MEMORY)
 733                         bio->pbi_enabled = (value & PCIM_CMD_MEMEN) != 0;
 734                 else
 735                         bio->pbi_enabled = (value & PCIM_CMD_PORTEN) != 0;
 736                 error = 0;
 737                 break;
 738         default:
 739                 error = ENOTTY;
 740                 break;
 741         }
 742
 743         return (error);
 744 }