ls-kernel.c

   1 /*
   2  *      The PCI Utilities -- Show Kernel Drivers
   3  *
   4  *      Copyright (c) 1997--2013 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11
  12 #include "lspci.h"
  13
  14 #ifdef PCI_OS_LINUX
  15
  16 #include <sys/utsname.h>
  17
  18 #ifdef PCI_USE_LIBKMOD
  19
  20 #include <libkmod.h>
  21
  22 static struct kmod_ctx *kmod_ctx;
  23
  24 static int
  25 show_kernel_init(void)
  26 {
  27   static int show_kernel_inited = -1;
  28   if (show_kernel_inited >= 0)
  29     return show_kernel_inited;
  30
  31   kmod_ctx = kmod_new(NULL, NULL);
  32   if (!kmod_ctx)
  33     {
  34       fprintf(stderr, "lspci: Unable to initialize libkmod context\n");
  35       goto failed;
  36     }
  37
  38   int err;
  39   if ((err = kmod_load_resources(kmod_ctx)) < 0)
  40     {
  41       fprintf(stderr, "lspci: Unable to load libkmod resources: error %d\n", err);
  42       goto failed;
  43     }
  44
  45   show_kernel_inited = 1;
  46   return 1;
  47
  48 failed:
  49   show_kernel_inited = 0;
  50   return 0;
  51 }
  52
  53 void
  54 show_kernel_cleanup(void)
  55 {
  56   if (kmod_ctx)
  57     kmod_unref(kmod_ctx);
  58 }
  59
  60 static const char *next_module(struct device *d)
  61 {
  62   static struct kmod_list *klist, *kcurrent;
  63   static struct kmod_module *kmodule;
  64
  65   if (kmodule)
  66     {
  67       kmod_module_unref(kmodule);
  68       kmodule = NULL;
  69     }
  70
  71   if (!klist)
  72     {
  73       pci_fill_info(d->dev, PCI_FILL_MODULE_ALIAS);
  74       if (!d->dev->module_alias)
  75         return NULL;
  76       int err = kmod_module_new_from_lookup(kmod_ctx, d->dev->module_alias, &klist);
  77       if (err < 0)
  78         {
  79           fprintf(stderr, "lspci: libkmod lookup failed: error %d\n", err);
  80           return NULL;
  81         }
  82       kcurrent = klist;
  83     }
  84   else
  85     kcurrent = kmod_list_next(klist, kcurrent);
  86
  87   if (kcurrent)
  88     {
  89       kmodule = kmod_module_get_module(kcurrent);
  90       return kmod_module_get_name(kmodule);
  91     }
  92
  93   kmod_module_unref_list(klist);
  94   klist = NULL;
  95   return NULL;
  96 }
  97
  98 #else
  99
 100 struct pcimap_entry {
 101   struct pcimap_entry *next;
 102   unsigned int vendor, device;
 103   unsigned int subvendor, subdevice;
 104   unsigned int class, class_mask;
 105   char module[1];
 106 };
 107
 108 static struct pcimap_entry *pcimap_head;
 109
 110 static int
 111 show_kernel_init(void)
 112 {
 113   static int tried_pcimap;
 114   struct utsname uts;
 115   char *name, line[1024];
 116   FILE *f;
 117
 118   if (tried_pcimap)
 119     return 1;
 120   tried_pcimap = 1;
 121
 122   if (name = opt_pcimap)
 123     {
 124       f = fopen(name, "r");
 125       if (!f)
 126         die("Cannot open pcimap file %s: %m", name);
 127     }
 128   else
 129     {
 130       if (uname(&uts) < 0)
 131         die("uname() failed: %m");
 132       name = alloca(64 + strlen(uts.release));
 133       sprintf(name, "/lib/modules/%s/modules.pcimap", uts.release);
 134       f = fopen(name, "r");
 135       if (!f)
 136         return 1;
 137     }
 138
 139   while (fgets(line, sizeof(line), f))
 140     {
 141       char *c = strchr(line, '\n');
 142       struct pcimap_entry *e;
 143
 144       if (!c)
 145         die("Unterminated or too long line in %s", name);
 146       *c = 0;
 147       if (!line[0] || line[0] == '#')
 148         continue;
 149
 150       c = line;
 151       while (*c && *c != ' ' && *c != '\t')
 152         c++;
 153       if (!*c)
 154         continue;       /* FIXME: Emit warnings! */
 155       *c++ = 0;
 156
 157       e = xmalloc(sizeof(*e) + strlen(line));
 158       if (sscanf(c, "%i%i%i%i%i%i",
 159                  &e->vendor, &e->device,
 160                  &e->subvendor, &e->subdevice,
 161                  &e->class, &e->class_mask) != 6)
 162         continue;
 163       e->next = pcimap_head;
 164       pcimap_head = e;
 165       strcpy(e->module, line);
 166     }
 167   fclose(f);
 168
 169   return 1;
 170 }
 171
 172 static int
 173 match_pcimap(struct device *d, struct pcimap_entry *e)
 174 {
 175   struct pci_dev *dev = d->dev;
 176   unsigned int class = (((unsigned int)dev->device_class << 8) | dev->prog_if);
 177
 178 #define MATCH(x, y) ((y) > 0xffff || (x) == (y))
 179   return
 180     MATCH(dev->vendor_id, e->vendor) &&
 181     MATCH(dev->device_id, e->device) &&
 182     MATCH(dev->subsys_vendor_id, e->subvendor) &&
 183     MATCH(dev->subsys_id, e->subdevice) &&
 184     (class & e->class_mask) == e->class;
 185 #undef MATCH
 186 }
 187
 188 static const char *next_module(struct device *d)
 189 {
 190   static struct pcimap_entry *current;
 191
 192   if (!current)
 193     current = pcimap_head;
 194   else
 195     current = current->next;
 196
 197   while (current)
 198     {
 199       if (match_pcimap(d, current))
 200         return current->module;
 201       current = current->next;
 202     }
 203
 204   return NULL;
 205 }
 206
 207 void
 208 show_kernel_cleanup(void)
 209 {
 210 }
 211
 212 #endif
 213
 214 static const char *
 215 next_module_filtered(struct device *d)
 216 {
 217   static char prev_module[256];
 218   const char *module;
 219
 220   while (module = next_module(d))
 221     {
 222       if (strcmp(module, prev_module))
 223         {
 224           strncpy(prev_module, module, sizeof(prev_module));
 225           prev_module[sizeof(prev_module) - 1] = 0;
 226           return module;
 227         }
 228     }
 229   prev_module[0] = 0;
 230   return NULL;
 231 }
 232
 233 void
 234 show_kernel(struct device *d)
 235 {
 236   const char *driver, *module;
 237
 238   pci_fill_info(d->dev, PCI_FILL_DRIVER);
 239   if (driver = pci_get_string_property(d->dev, PCI_FILL_DRIVER))
 240     printf("\tKernel driver in use: %s\n", driver);
 241
 242   if (!show_kernel_init())
 243     return;
 244
 245   int cnt = 0;
 246   while (module = next_module_filtered(d))
 247     printf("%s %s", (cnt++ ? "," : "\tKernel modules:"), module);
 248   if (cnt)
 249     putchar('\n');
 250 }
 251
 252 void
 253 show_kernel_machine(struct device *d)
 254 {
 255   const char *driver, *module;
 256
 257   pci_fill_info(d->dev, PCI_FILL_DRIVER);
 258   if (driver = pci_get_string_property(d->dev, PCI_FILL_DRIVER))
 259     printf("Driver:\t%s\n", driver);
 260
 261   if (!show_kernel_init())
 262     return;
 263
 264   while (module = next_module_filtered(d))
 265     printf("Module:\t%s\n", module);
 266 }
 267
 268 #else
 269
 270 void
 271 show_kernel(struct device *d)
 272 {
 273   const char *driver;
 274
 275   pci_fill_info(d->dev, PCI_FILL_DRIVER);
 276   if (driver = pci_get_string_property(d->dev, PCI_FILL_DRIVER))
 277     printf("\tDriver in use: %s\n", driver);
 278 }
 279
 280 void
 281 show_kernel_machine(struct device *d)
 282 {
 283   const char *driver;
 284
 285   pci_fill_info(d->dev, PCI_FILL_DRIVER);
 286   if (driver = pci_get_string_property(d->dev, PCI_FILL_DRIVER))
 287     printf("Driver:\t%s\n", driver);
 288 }
 289
 290 void
 291 show_kernel_cleanup(void)
 292 {
 293 }
 294
 295 #endif
 296