setpci.c

   1 /*
   2  *      $Id: setpci.c,v 1.4 1998/06/09 19:22:05 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 #ifdef __GLIBC__
  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 #ifdef __GLIBC__
  69 #ifndef SYS_pread
  70 #define SYS_pread __NR_pread
  71 #endif
  72 static int
  73 pread(unsigned int fd, void *buf, size_t size, loff_t where)
  74 {
  75   return syscall(SYS_pread, fd, buf, size, where);
  76 }
  77
  78 #ifndef SYS_pwrite
  79 #define SYS_pwrite __NR_pwrite
  80 #endif
  81 static int
  82 pwrite(unsigned int fd, void *buf, size_t size, loff_t where)
  83 {
  84   return syscall(SYS_pwrite, fd, buf, size, where);
  85 }
  86 #else
  87 static _syscall4(int, pread, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
  88 static _syscall4(int, pwrite, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
  89 #endif
  90
  91 static void
  92 scan_devices(void)
  93 {
  94   struct device **last = &first_dev;
  95   byte line[256];
  96   FILE *f;
  97
  98   if (!(f = fopen(PROC_BUS_PCI "/devices", "r")))
  99     {
 100       perror(PROC_BUS_PCI "/devices");
 101       exit(1);
 102     }
 103   while (fgets(line, sizeof(line), f))
 104     {
 105       struct device *d = xmalloc(sizeof(struct device));
 106       unsigned int dfn, vend;
 107
 108       sscanf(line, "%x %x", &dfn, &vend);
 109       d->bus = dfn >> 8U;
 110       d->devfn = dfn & 0xff;
 111       d->vendid = vend >> 16U;
 112       d->devid = vend & 0xffff;
 113       d->fd = -1;
 114       *last = d;
 115       last = &d->next;
 116     }
 117   fclose(f);
 118   *last = NULL;
 119 }
 120
 121 static struct device **
 122 select_devices(struct pci_filter *filt)
 123 {
 124   struct device *z, **a, **b;
 125   int cnt = 1;
 126
 127   for(z=first_dev; z; z=z->next)
 128     if (z->mark = filter_match(filt, z->bus, z->devfn, z->vendid, z->devid))
 129       cnt++;
 130   a = b = xmalloc(sizeof(struct device *) * cnt);
 131   for(z=first_dev; z; z=z->next)
 132     if (z->mark)
 133       *a++ = z;
 134   *a = NULL;
 135   return b;
 136 }
 137
 138 static void
 139 exec_op(struct op *op, struct device *dev)
 140 {
 141   char *mm[] = { NULL, "%02x", "%04x", NULL, "%08x" };
 142   char *m = mm[op->width];
 143   unsigned int x;
 144   int i;
 145   __u32 x32;
 146   __u16 x16;
 147   __u8 x8;
 148
 149   if (!demo_mode && dev->fd < 0)
 150     {
 151       char name[64];
 152       sprintf(name, PROC_BUS_PCI "/%02x/%02x.%x", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 153       if ((dev->fd = open(name, dev->need_write ? O_RDWR : O_RDONLY)) < 0)
 154         {
 155           perror(name);
 156           exit(1);
 157         }
 158     }
 159
 160   if (verbose)
 161     printf("%02x:%02x.%x:%02x", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), op->addr);
 162   if (op->num_values >= 0)
 163     for(i=0; i<op->num_values; i++)
 164       {
 165         if (verbose)
 166           {
 167             putchar(' ');
 168             printf(m, op->values[i]);
 169           }
 170         if (demo_mode)
 171           continue;
 172         switch (op->width)
 173           {
 174           case 1:
 175             x8 = op->values[i];
 176             i = pwrite(dev->fd, &x8, 1, op->addr);
 177             break;
 178           case 2:
 179             x16 = __cpu_to_le16(op->values[i]);
 180             i = pwrite(dev->fd, &x16, 2, op->addr);
 181             break;
 182           default:
 183             x32 = __cpu_to_le32(op->values[i]);
 184             i = pwrite(dev->fd, &x32, 4, op->addr);
 185             break;
 186           }
 187         if (i != (int) op->width)
 188           {
 189             fprintf(stderr, "Error writing to %02x:%02x.%d: %m\n", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 190             exit(1);
 191           }
 192       }
 193   else
 194     {
 195       if (verbose)
 196         printf(" = ");
 197       if (!demo_mode)
 198         {
 199           switch (op->width)
 200             {
 201             case 1:
 202               i = pread(dev->fd, &x8, 1, op->addr);
 203               x = x8;
 204               break;
 205             case 2:
 206               i = pread(dev->fd, &x16, 2, op->addr);
 207               x = __le16_to_cpu(x16);
 208               break;
 209             default:
 210               i = pread(dev->fd, &x32, 4, op->addr);
 211               x = __le32_to_cpu(x32);
 212               break;
 213             }
 214           if (i != (int) op->width)
 215             {
 216               fprintf(stderr, "Error reading from %02x:%02x.%d: %m\n", dev->bus, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 217               exit(1);
 218             }
 219           printf(m, x);
 220         }
 221       else
 222         putchar('?');
 223     }
 224   putchar('\n');
 225 }
 226
 227 static void
 228 execute(struct op *op)
 229 {
 230   struct device **vec = NULL;
 231   struct device **pdev, *dev;
 232   struct op *oops;
 233
 234   while (op)
 235     {
 236       pdev = vec = op->dev_vector;
 237       while (dev = *pdev++)
 238         for(oops=op; oops && oops->dev_vector == vec; oops=oops->next)
 239           exec_op(oops, dev);
 240       while (op && op->dev_vector == vec)
 241         op = op->next;
 242     }
 243 }
 244
 245 static void
 246 scan_ops(struct op *op)
 247 {
 248   struct device **pdev, *dev;
 249
 250   while (op)
 251     {
 252       if (op->num_values >= 0)
 253         {
 254           pdev = op->dev_vector;
 255           while (dev = *pdev++)
 256             dev->need_write = 1;
 257         }
 258       op = op->next;
 259     }
 260 }
 261
 262 struct reg_name {
 263   int offset;
 264   int width;
 265   char *name;
 266 };
 267
 268 static struct reg_name pci_reg_names[] = {
 269   { 0x00, 2, "VENDOR_ID", },
 270   { 0x02, 2, "DEVICE_ID", },
 271   { 0x04, 2, "COMMAND", },
 272   { 0x06, 2, "STATUS", },
 273   { 0x08, 1, "REVISION", },
 274   { 0x09, 1, "CLASS_PROG", },
 275   { 0x0a, 2, "CLASS_DEVICE", },
 276   { 0x0c, 1, "CACHE_LINE_SIZE", },
 277   { 0x0d, 1, "LATENCY_TIMER", },
 278   { 0x0e, 1, "HEADER_TYPE", },
 279   { 0x0f, 1, "BIST", },
 280   { 0x10, 4, "BASE_ADDRESS_0", },
 281   { 0x14, 4, "BASE_ADDRESS_1", },
 282   { 0x18, 4, "BASE_ADDRESS_2", },
 283   { 0x1c, 4, "BASE_ADDRESS_3", },
 284   { 0x20, 4, "BASE_ADDRESS_4", },
 285   { 0x24, 4, "BASE_ADDRESS_5", },
 286   { 0x28, 4, "CARDBUS_CIS", },
 287   { 0x2c, 4, "SUBSYSTEM_VENDOR_ID", },
 288   { 0x2e, 2, "SUBSYSTEM_ID", },
 289   { 0x30, 4, "ROM_ADDRESS", },
 290   { 0x3c, 1, "INTERRUPT_LINE", },
 291   { 0x3d, 1, "INTERRUPT_PIN", },
 292   { 0x3e, 1, "MIN_GNT", },
 293   { 0x3f, 1, "MAX_LAT", },
 294   { 0x18, 1, "PRIMARY_BUS", },
 295   { 0x19, 1, "SECONDARY_BUS", },
 296   { 0x1a, 1, "SUBORDINATE_BUS", },
 297   { 0x1b, 1, "SEC_LATENCY_TIMER", },
 298   { 0x1c, 1, "IO_BASE", },
 299   { 0x1d, 1, "IO_LIMIT", },
 300   { 0x1e, 2, "SEC_STATUS", },
 301   { 0x20, 2, "MEMORY_BASE", },
 302   { 0x22, 2, "MEMORY_LIMIT", },
 303   { 0x24, 2, "PREF_MEMORY_BASE", },
 304   { 0x26, 2, "PREF_MEMORY_LIMIT", },
 305   { 0x28, 4, "PREF_BASE_UPPER32", },
 306   { 0x2c, 4, "PREF_LIMIT_UPPER32", },
 307   { 0x30, 2, "IO_BASE_UPPER16", },
 308   { 0x32, 2, "IO_LIMIT_UPPER16", },
 309   { 0x38, 4, "BRIDGE_ROM_ADDRESS", },
 310   { 0x3e, 2, "BRIDGE_CONTROL", },
 311   { 0x10, 4, "CB_CARDBUS_BASE", },
 312   { 0x14, 2, "CB_CAPABILITIES", },
 313   { 0x16, 2, "CB_SEC_STATUS", },
 314   { 0x18, 1, "CB_BUS_NUMBER", },
 315   { 0x19, 1, "CB_CARDBUS_NUMBER", },
 316   { 0x1a, 1, "CB_SUBORDINATE_BUS", },
 317   { 0x1b, 1, "CB_CARDBUS_LATENCY", },
 318   { 0x1c, 4, "CB_MEMORY_BASE_0", },
 319   { 0x20, 4, "CB_MEMORY_LIMIT_0", },
 320   { 0x24, 4, "CB_MEMORY_BASE_1", },
 321   { 0x28, 4, "CB_MEMORY_LIMIT_1", },
 322   { 0x2c, 2, "CB_IO_BASE_0", },
 323   { 0x2e, 2, "CB_IO_BASE_0_HI", },
 324   { 0x30, 2, "CB_IO_LIMIT_0", },
 325   { 0x32, 2, "CB_IO_LIMIT_0_HI", },
 326   { 0x34, 2, "CB_IO_BASE_1", },
 327   { 0x36, 2, "CB_IO_BASE_1_HI", },
 328   { 0x38, 2, "CB_IO_LIMIT_1", },
 329   { 0x3a, 2, "CB_IO_LIMIT_1_HI", },
 330   { 0x40, 2, "CB_SUBSYSTEM_VENDOR_ID", },
 331   { 0x42, 2, "CB_SUBSYSTEM_ID", },
 332   { 0x44, 4, "CB_LEGACY_MODE_BASE", },
 333   { 0x00, 0, NULL }
 334 };
 335
 336 static void usage(void) __attribute__((noreturn));
 337
 338 static void
 339 usage(void)
 340 {
 341   fprintf(stderr,
 342 "Usage: setpci [-fvD] (<device>+ <reg>[=<values>]*)*\n\
 343 -f\t\tDon't complain if there's nothing to do\n\
 344 -v\t\tBe verbose\n\
 345 -D\t\tList changes, don't commit them\n\
 346 <device>:\t-s [[<bus>]:][<slot>][.[<func>]]\n\
 347 \t|\t-d [<vendor>]:[<device>]\n\
 348 <reg>:\t\t<number>[.(B|W|L)]\n\
 349      |\t\t<name>\n\
 350 <values>:\t<value>[,<value>...]\n\
 351 ");
 352   exit(1);
 353 }
 354
 355 int
 356 main(int argc, char **argv)
 357 {
 358   enum { STATE_INIT, STATE_GOT_FILTER, STATE_GOT_OP } state = STATE_INIT;
 359   struct pci_filter filter;
 360   struct device **selected_devices = NULL;
 361
 362   if (argc == 2 && !strcmp(argv[1], "--version"))
 363     {
 364       puts("setpci version " PCIUTILS_VERSION);
 365       return 0;
 366     }
 367   argc--;
 368   argv++;
 369   while (argc && argv[0][0] == '-')
 370     {
 371       char *c = argv[0]+1;
 372       char *d = c;
 373       while (*c)
 374         switch (*c)
 375           {
 376           case 'v':
 377             verbose++;
 378             c++;
 379             break;
 380           case 'f':
 381             force++;
 382             c++;
 383             break;
 384           case 'D':
 385             demo_mode++;
 386             c++;
 387             break;
 388           case 0:
 389             break;
 390           default:
 391             if (c != d)
 392               usage();
 393             goto next;
 394           }
 395       argc--;
 396       argv++;
 397     }
 398 next:
 399
 400   scan_devices();
 401
 402   while (argc)
 403     {
 404       char *c = argv[0];
 405       char *d, *e, *f;
 406       int n, i;
 407       struct op *op;
 408       unsigned long ll, lim;
 409
 410       if (*c == '-')
 411         {
 412           if (!c[1] || !strchr("sd", c[1]))
 413             usage();
 414           if (c[2])
 415             d = (c[2] == '=') ? c+3 : c+2;
 416           else if (argc)
 417             {
 418               argc--;
 419               argv++;
 420               d = argv[0];
 421             }
 422           else
 423             usage();
 424           if (state != STATE_GOT_FILTER)
 425             {
 426               filter_init(&filter);
 427               state = STATE_GOT_FILTER;
 428             }
 429           switch (c[1])
 430             {
 431             case 's':
 432               if (d = filter_parse_slot(&filter, d))
 433                 {
 434                   fprintf(stderr, "setpci: -s: %s\n", d);
 435                   return 1;
 436                 }
 437               break;
 438             case 'd':
 439               if (d = filter_parse_id(&filter, d))
 440                 {
 441                   fprintf(stderr, "setpci: -d: %s\n", d);
 442                   return 1;
 443                 }
 444               break;
 445             default:
 446               usage();
 447             }
 448         }
 449       else if (state == STATE_INIT)
 450         usage();
 451       else
 452         {
 453           if (state == STATE_GOT_FILTER)
 454             selected_devices = select_devices(&filter);
 455           if (!selected_devices[0] && !force)
 456             fprintf(stderr, "setpci: Warning: No devices selected for `%s'.\n", c);
 457           state = STATE_GOT_OP;
 458           d = strchr(c, '=');
 459           if (d)
 460             {
 461               *d++ = 0;
 462               if (!*d)
 463                 usage();
 464               for(e=d, n=1; *e; e++)
 465                 if (*e == ',')
 466                   n++;
 467               op = xmalloc(sizeof(struct op) + n*sizeof(unsigned int));
 468             }
 469           else
 470             {
 471               n = -1;
 472               op = xmalloc(sizeof(struct op));
 473             }
 474           op->dev_vector = selected_devices;
 475           op->num_values = n;
 476           e = strchr(c, '.');
 477           if (e)
 478             {
 479               *e++ = 0;
 480               if (e[1])
 481                 usage();
 482               switch (*e & 0xdf)
 483                 {
 484                 case 'B':
 485                   op->width = 1; break;
 486                 case 'W':
 487                   op->width = 2; break;
 488                 case 'L':
 489                   op->width = 4; break;
 490                 default:
 491                   usage();
 492                 }
 493             }
 494           else
 495             op->width = 1;
 496           ll = strtol(c, &f, 16);
 497           if (f && *f)
 498             {
 499               struct reg_name *r;
 500               for(r = pci_reg_names; r->name; r++)
 501                 if (!strcasecmp(r->name, c))
 502                   break;
 503               if (!r->name || e)
 504                 usage();
 505               ll = r->offset;
 506               op->width = r->width;
 507             }
 508           if (ll > 0x100 || ll + op->width*((n < 0) ? 1 : n) > 0x100)
 509             {
 510               fprintf(stderr, "setpci: Register number out of range!\n");
 511               return 1;
 512             }
 513           if (ll & (op->width - 1))
 514             {
 515               fprintf(stderr, "setpci: Unaligned register address!\n");
 516               return 1;
 517             }
 518           op->addr = ll;
 519           for(i=0; i<n; i++)
 520             {
 521               e = strchr(d, ',');
 522               if (e)
 523                 *e++ = 0;
 524               ll = strtoul(d, &f, 16);
 525               lim = (2 << ((op->width << 3) - 1)) - 1;
 526               if (f && *f ||
 527                   (ll > lim && ll < ~0UL - lim))
 528                 usage();
 529               op->values[i] = ll;
 530               d = e;
 531             }
 532           *last_op = op;
 533           last_op = &op->next;
 534           op->next = NULL;
 535         }
 536       argc--;
 537       argv++;
 538     }
 539   if (state == STATE_INIT)
 540     usage();
 541
 542   scan_ops(first_op);
 543   execute(first_op);
 544
 545   return 0;
 546 }