setpci.c

   1 /*
   2  *      $Id: setpci.c,v 1.8 1998/10/24 13:39:20 mj Exp $
   3  *
   4  *      Linux PCI Utilities -- Manipulate PCI Configuration Registers
   5  *
   6  *      Copyright (c) 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   7  *
   8  *      Can be freely distributed and used under the terms of the GNU GPL.
   9  */
  10
  11 #define _GNU_SOURCE
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <fcntl.h>
  17 #include <unistd.h>
  18 #include <errno.h>
  19 #include <asm/byteorder.h>
  20
  21 #include <asm/unistd.h>
  22 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
  23 #include <syscall-list.h>
  24 #endif
  25
  26 #include "pciutils.h"
  27
  28 static int force;                       /* Don't complain if no devices match */
  29 static int verbose;                     /* Verbosity level */
  30 static int demo_mode;                   /* Only show */
  31
  32 struct device {
  33   struct device *next;
  34   byte bus, devfn, mark;
  35   word vendid, devid;
  36   int fd, need_write;
  37 };
  38
  39 static struct device *first_dev;
  40
  41 struct op {
  42   struct op *next;
  43   struct device **dev_vector;
  44   unsigned int addr;
  45   unsigned int width;                   /* Byte width of the access */
  46   int num_values;                       /* Number of values to write; <0=read */
  47   unsigned int values[0];
  48 };
  49
  50 static struct op *first_op, **last_op = &first_op;
  51
  52 void *
  53 xmalloc(unsigned int howmuch)
  54 {
  55   void *p = malloc(howmuch);
  56   if (!p)
  57     {
  58       fprintf(stderr, "setpci: Unable to allocate %d bytes of memory\n", howmuch);
  59       exit(1);
  60     }
  61   return p;
  62 }
  63
  64 /*
  65  * As libc doesn't support pread/pwrite yet, we have to call them directly
  66  * or use lseek/read/write instead.
  67  */
  68 #if !(defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ > 0)
  69
  70 #if defined(__GLIBC__) && !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
  71 #ifndef SYS_pread
  72 #define SYS_pread __NR_pread
  73 #endif
  74 static int
  75 pread(unsigned int fd, void *buf, size_t size, loff_t where)
  76 {
  77   return syscall(SYS_pread, fd, buf, size, where);
  78 }
  79
  80 #ifndef SYS_pwrite
  81 #define SYS_pwrite __NR_pwrite
  82 #endif
  83 static int
  84 pwrite(unsigned int fd, void *buf, size_t size, loff_t where)
  85 {
  86   return syscall(SYS_pwrite, fd, buf, size, where);
  87 }
  88 #else
  89 static _syscall4(int, pread, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
  90 static _syscall4(int, pwrite, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
  91 #endif
  92
  93 #endif
  94
  95 static void
  96 scan_devices(void)
  97 {
  98   struct device **last = &first_dev;
  99   byte line[256];
 100   FILE *f;
 101
 102   if (!(f = fopen(PROC_BUS_PCI "/devices", "r")))
 103     {
 104       perror(PROC_BUS_PCI "/devices");
 105       exit(1);
 106     }
 107   while (fgets(line, sizeof(line), f))
 108     {
 109       struct device *d = xmalloc(sizeof(struct device));
 110       unsigned int dfn, vend;
 111
 112       sscanf(line, "%x %x", &dfn, &vend);
 113       d->bus = dfn >> 8U;
 114       d->devfn = dfn & 0xff;
 115       d->vendid = vend >> 16U;
 116       d->devid = vend & 0xffff;
 117       d->fd = -1;
 118       *last = d;
 119       last = &d->next;
 120     }
 121   fclose(f);
 122   *last = NULL;
 123 }
 124
 125 static struct device **
 126 select_devices(struct pci_filter *filt)
 127 {
 128   struct device *z, **a, **b;
 129   int cnt = 1;
 130
 131   for(z=first_dev; z; z=z->next)
 132     if (z->mark = filter_match(filt, z->bus, z->devfn, z->vendid, z->devid))
 133       cnt++;
 134   a = b = xmalloc(sizeof(struct device *) * cnt);
 135   for(z=first_dev; z; z=z->next)
 136     if (z->mark)
 137       *a++ = z;
 138   *a = NULL;
 139   return b;
 140 }
 141
 142 static void
 143 exec_op(struct op *op, struct device *dev)
 144 {
 145   char *mm[] = { NULL, "%02x", "%04x", NULL, "%08x" };
 146   char *m = mm[op->width];
 147   unsigned int x;
 148   int i;
 149   __u32 x32;
 150   __u16 x16;
 151   __u8 x8;
 152
 153   if (!demo_mode && dev->fd < 0)
 154     {
 155       char name[64];
 156       sprintf(name, PROC_BUS_PCI "/%02x/%02x.%x", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 157       if ((dev->fd = open(name, dev->need_write ? O_RDWR : O_RDONLY)) < 0)
 158         {
 159           perror(name);
 160           exit(1);
 161         }
 162     }
 163
 164   if (verbose)
 165     printf("%02x:%02x.%x:%02x", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), op->addr);
 166   if (op->num_values >= 0)
 167     for(i=0; i<op->num_values; i++)
 168       {
 169         if (verbose)
 170           {
 171             putchar(' ');
 172             printf(m, op->values[i]);
 173           }
 174         if (demo_mode)
 175           continue;
 176         switch (op->width)
 177           {
 178           case 1:
 179             x8 = op->values[i];
 180             i = pwrite(dev->fd, &x8, 1, op->addr);
 181             break;
 182           case 2:
 183             x16 = __cpu_to_le16(op->values[i]);
 184             i = pwrite(dev->fd, &x16, 2, op->addr);
 185             break;
 186           default:
 187             x32 = __cpu_to_le32(op->values[i]);
 188             i = pwrite(dev->fd, &x32, 4, op->addr);
 189             break;
 190           }
 191         if (i != (int) op->width)
 192           {
 193             fprintf(stderr, "Error writing to %02x:%02x.%d: %m\n", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 194             exit(1);
 195           }
 196       }
 197   else
 198     {
 199       if (verbose)
 200         printf(" = ");
 201       if (!demo_mode)
 202         {
 203           switch (op->width)
 204             {
 205             case 1:
 206               i = pread(dev->fd, &x8, 1, op->addr);
 207               x = x8;
 208               break;
 209             case 2:
 210               i = pread(dev->fd, &x16, 2, op->addr);
 211               x = __le16_to_cpu(x16);
 212               break;
 213             default:
 214               i = pread(dev->fd, &x32, 4, op->addr);
 215               x = __le32_to_cpu(x32);
 216               break;
 217             }
 218           if (i != (int) op->width)
 219             {
 220               fprintf(stderr, "Error reading from %02x:%02x.%d: %m\n", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 221               exit(1);
 222             }
 223           printf(m, x);
 224         }
 225       else
 226         putchar('?');
 227     }
 228   putchar('\n');
 229 }
 230
 231 static void
 232 execute(struct op *op)
 233 {
 234   struct device **vec = NULL;
 235   struct device **pdev, *dev;
 236   struct op *oops;
 237
 238   while (op)
 239     {
 240       pdev = vec = op->dev_vector;
 241       while (dev = *pdev++)
 242         for(oops=op; oops && oops->dev_vector == vec; oops=oops->next)
 243           exec_op(oops, dev);
 244       while (op && op->dev_vector == vec)
 245         op = op->next;
 246     }
 247 }
 248
 249 static void
 250 scan_ops(struct op *op)
 251 {
 252   struct device **pdev, *dev;
 253
 254   while (op)
 255     {
 256       if (op->num_values >= 0)
 257         {
 258           pdev = op->dev_vector;
 259           while (dev = *pdev++)
 260             dev->need_write = 1;
 261         }
 262       op = op->next;
 263     }
 264 }
 265
 266 struct reg_name {
 267   int offset;
 268   int width;
 269   char *name;
 270 };
 271
 272 static struct reg_name pci_reg_names[] = {
 273   { 0x00, 2, "VENDOR_ID", },
 274   { 0x02, 2, "DEVICE_ID", },
 275   { 0x04, 2, "COMMAND", },
 276   { 0x06, 2, "STATUS", },
 277   { 0x08, 1, "REVISION", },
 278   { 0x09, 1, "CLASS_PROG", },
 279   { 0x0a, 2, "CLASS_DEVICE", },
 280   { 0x0c, 1, "CACHE_LINE_SIZE", },
 281   { 0x0d, 1, "LATENCY_TIMER", },
 282   { 0x0e, 1, "HEADER_TYPE", },
 283   { 0x0f, 1, "BIST", },
 284   { 0x10, 4, "BASE_ADDRESS_0", },
 285   { 0x14, 4, "BASE_ADDRESS_1", },
 286   { 0x18, 4, "BASE_ADDRESS_2", },
 287   { 0x1c, 4, "BASE_ADDRESS_3", },
 288   { 0x20, 4, "BASE_ADDRESS_4", },
 289   { 0x24, 4, "BASE_ADDRESS_5", },
 290   { 0x28, 4, "CARDBUS_CIS", },
 291   { 0x2c, 4, "SUBSYSTEM_VENDOR_ID", },
 292   { 0x2e, 2, "SUBSYSTEM_ID", },
 293   { 0x30, 4, "ROM_ADDRESS", },
 294   { 0x3c, 1, "INTERRUPT_LINE", },
 295   { 0x3d, 1, "INTERRUPT_PIN", },
 296   { 0x3e, 1, "MIN_GNT", },
 297   { 0x3f, 1, "MAX_LAT", },
 298   { 0x18, 1, "PRIMARY_BUS", },
 299   { 0x19, 1, "SECONDARY_BUS", },
 300   { 0x1a, 1, "SUBORDINATE_BUS", },
 301   { 0x1b, 1, "SEC_LATENCY_TIMER", },
 302   { 0x1c, 1, "IO_BASE", },
 303   { 0x1d, 1, "IO_LIMIT", },
 304   { 0x1e, 2, "SEC_STATUS", },
 305   { 0x20, 2, "MEMORY_BASE", },
 306   { 0x22, 2, "MEMORY_LIMIT", },
 307   { 0x24, 2, "PREF_MEMORY_BASE", },
 308   { 0x26, 2, "PREF_MEMORY_LIMIT", },
 309   { 0x28, 4, "PREF_BASE_UPPER32", },
 310   { 0x2c, 4, "PREF_LIMIT_UPPER32", },
 311   { 0x30, 2, "IO_BASE_UPPER16", },
 312   { 0x32, 2, "IO_LIMIT_UPPER16", },
 313   { 0x38, 4, "BRIDGE_ROM_ADDRESS", },
 314   { 0x3e, 2, "BRIDGE_CONTROL", },
 315   { 0x10, 4, "CB_CARDBUS_BASE", },
 316   { 0x14, 2, "CB_CAPABILITIES", },
 317   { 0x16, 2, "CB_SEC_STATUS", },
 318   { 0x18, 1, "CB_BUS_NUMBER", },
 319   { 0x19, 1, "CB_CARDBUS_NUMBER", },
 320   { 0x1a, 1, "CB_SUBORDINATE_BUS", },
 321   { 0x1b, 1, "CB_CARDBUS_LATENCY", },
 322   { 0x1c, 4, "CB_MEMORY_BASE_0", },
 323   { 0x20, 4, "CB_MEMORY_LIMIT_0", },
 324   { 0x24, 4, "CB_MEMORY_BASE_1", },
 325   { 0x28, 4, "CB_MEMORY_LIMIT_1", },
 326   { 0x2c, 2, "CB_IO_BASE_0", },
 327   { 0x2e, 2, "CB_IO_BASE_0_HI", },
 328   { 0x30, 2, "CB_IO_LIMIT_0", },
 329   { 0x32, 2, "CB_IO_LIMIT_0_HI", },
 330   { 0x34, 2, "CB_IO_BASE_1", },
 331   { 0x36, 2, "CB_IO_BASE_1_HI", },
 332   { 0x38, 2, "CB_IO_LIMIT_1", },
 333   { 0x3a, 2, "CB_IO_LIMIT_1_HI", },
 334   { 0x40, 2, "CB_SUBSYSTEM_VENDOR_ID", },
 335   { 0x42, 2, "CB_SUBSYSTEM_ID", },
 336   { 0x44, 4, "CB_LEGACY_MODE_BASE", },
 337   { 0x00, 0, NULL }
 338 };
 339
 340 static void usage(void) __attribute__((noreturn));
 341
 342 static void
 343 usage(void)
 344 {
 345   fprintf(stderr,
 346 "Usage: setpci [-fvD] (<device>+ <reg>[=<values>]*)*\n\
 347 -f\t\tDon't complain if there's nothing to do\n\
 348 -v\t\tBe verbose\n\
 349 -D\t\tList changes, don't commit them\n\
 350 <device>:\t-s [[<bus>]:][<slot>][.[<func>]]\n\
 351 \t|\t-d [<vendor>]:[<device>]\n\
 352 <reg>:\t\t<number>[.(B|W|L)]\n\
 353      |\t\t<name>\n\
 354 <values>:\t<value>[,<value>...]\n\
 355 ");
 356   exit(1);
 357 }
 358
 359 int
 360 main(int argc, char **argv)
 361 {
 362   enum { STATE_INIT, STATE_GOT_FILTER, STATE_GOT_OP } state = STATE_INIT;
 363   struct pci_filter filter;
 364   struct device **selected_devices = NULL;
 365
 366   if (argc == 2 && !strcmp(argv[1], "--version"))
 367     {
 368       puts("setpci version " PCIUTILS_VERSION);
 369       return 0;
 370     }
 371   argc--;
 372   argv++;
 373   while (argc && argv[0][0] == '-')
 374     {
 375       char *c = argv[0]+1;
 376       char *d = c;
 377       while (*c)
 378         switch (*c)
 379           {
 380           case 'v':
 381             verbose++;
 382             c++;
 383             break;
 384           case 'f':
 385             force++;
 386             c++;
 387             break;
 388           case 'D':
 389             demo_mode++;
 390             c++;
 391             break;
 392           case 0:
 393             break;
 394           default:
 395             if (c != d)
 396               usage();
 397             goto next;
 398           }
 399       argc--;
 400       argv++;
 401     }
 402 next:
 403
 404   scan_devices();
 405
 406   while (argc)
 407     {
 408       char *c = argv[0];
 409       char *d, *e, *f;
 410       int n, i;
 411       struct op *op;
 412       unsigned long ll, lim;
 413
 414       if (*c == '-')
 415         {
 416           if (!c[1] || !strchr("sd", c[1]))
 417             usage();
 418           if (c[2])
 419             d = (c[2] == '=') ? c+3 : c+2;
 420           else if (argc)
 421             {
 422               argc--;
 423               argv++;
 424               d = argv[0];
 425             }
 426           else
 427             usage();
 428           if (state != STATE_GOT_FILTER)
 429             {
 430               filter_init(&filter);
 431               state = STATE_GOT_FILTER;
 432             }
 433           switch (c[1])
 434             {
 435             case 's':
 436               if (d = filter_parse_slot(&filter, d))
 437                 {
 438                   fprintf(stderr, "setpci: -s: %s\n", d);
 439                   return 1;
 440                 }
 441               break;
 442             case 'd':
 443               if (d = filter_parse_id(&filter, d))
 444                 {
 445                   fprintf(stderr, "setpci: -d: %s\n", d);
 446                   return 1;
 447                 }
 448               break;
 449             default:
 450               usage();
 451             }
 452         }
 453       else if (state == STATE_INIT)
 454         usage();
 455       else
 456         {
 457           if (state == STATE_GOT_FILTER)
 458             selected_devices = select_devices(&filter);
 459           if (!selected_devices[0] && !force)
 460             fprintf(stderr, "setpci: Warning: No devices selected for `%s'.\n", c);
 461           state = STATE_GOT_OP;
 462           d = strchr(c, '=');
 463           if (d)
 464             {
 465               *d++ = 0;
 466               if (!*d)
 467                 usage();
 468               for(e=d, n=1; *e; e++)
 469                 if (*e == ',')
 470                   n++;
 471               op = xmalloc(sizeof(struct op) + n*sizeof(unsigned int));
 472             }
 473           else
 474             {
 475               n = -1;
 476               op = xmalloc(sizeof(struct op));
 477             }
 478           op->dev_vector = selected_devices;
 479           op->num_values = n;
 480           e = strchr(c, '.');
 481           if (e)
 482             {
 483               *e++ = 0;
 484               if (e[1])
 485                 usage();
 486               switch (*e & 0xdf)
 487                 {
 488                 case 'B':
 489                   op->width = 1; break;
 490                 case 'W':
 491                   op->width = 2; break;
 492                 case 'L':
 493                   op->width = 4; break;
 494                 default:
 495                   usage();
 496                 }
 497             }
 498           else
 499             op->width = 1;
 500           ll = strtol(c, &f, 16);
 501           if (f && *f)
 502             {
 503               struct reg_name *r;
 504               for(r = pci_reg_names; r->name; r++)
 505                 if (!strcasecmp(r->name, c))
 506                   break;
 507               if (!r->name || e)
 508                 usage();
 509               ll = r->offset;
 510               op->width = r->width;
 511             }
 512           if (ll > 0x100 || ll + op->width*((n < 0) ? 1 : n) > 0x100)
 513             {
 514               fprintf(stderr, "setpci: Register number out of range!\n");
 515               return 1;
 516             }
 517           if (ll & (op->width - 1))
 518             {
 519               fprintf(stderr, "setpci: Unaligned register address!\n");
 520               return 1;
 521             }
 522           op->addr = ll;
 523           for(i=0; i<n; i++)
 524             {
 525               e = strchr(d, ',');
 526               if (e)
 527                 *e++ = 0;
 528               ll = strtoul(d, &f, 16);
 529               lim = (2 << ((op->width << 3) - 1)) - 1;
 530               if (f && *f ||
 531                   (ll > lim && ll < ~0UL - lim))
 532                 usage();
 533               op->values[i] = ll;
 534               d = e;
 535             }
 536           *last_op = op;
 537           last_op = &op->next;
 538           op->next = NULL;
 539         }
 540       argc--;
 541       argv++;
 542     }
 543   if (state == STATE_INIT)
 544     usage();
 545
 546   scan_ops(first_op);
 547   execute(first_op);
 548
 549   return 0;
 550 }