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 #include <unistd.h>
  12
  13 #include "lspci.h"
  14
  15 #ifdef PCI_OS_LINUX
  16
  17 #include <sys/utsname.h>
  18
  19 #ifdef PCI_USE_LIBKMOD
  20
  21 #include <libkmod.h>
  22
  23 static struct kmod_ctx *kmod_ctx;
  24
  25 static int
  26 show_kernel_init(void)
  27 {
  28   static int show_kernel_inited = -1;
  29   if (show_kernel_inited >= 0)
  30     return show_kernel_inited;
  31
  32   struct utsname uts;
  33   if (uname(&uts) < 0)
  34     die("uname() failed: %m");
  35   char *name = alloca(64 + strlen(uts.release));
  36   sprintf(name, "/lib/modules/%s", uts.release);
  37
  38   kmod_ctx = kmod_new(name, NULL);
  39   if (!kmod_ctx)
  40     {
  41       fprintf(stderr, "lspci: Unable to initialize libkmod context\n");
  42       goto failed;
  43     }
  44
  45   int err;
  46   if ((err = kmod_load_resources(kmod_ctx)) < 0)
  47     {
  48       fprintf(stderr, "lspci: Unable to load libkmod resources: error %d\n", err);
  49       goto failed;
  50     }
  51
  52   show_kernel_inited = 1;
  53   return 1;
  54
  55 failed:
  56   show_kernel_inited = 0;
  57   return 0;
  58 }
  59
  60 void
  61 show_kernel_cleanup(void)
  62 {
  63   if (kmod_ctx)
  64     kmod_unref(kmod_ctx);
  65 }
  66
  67 static const char *next_module(struct device *d)
  68 {
  69   static struct kmod_list *klist, *kcurrent;
  70   static struct kmod_module *kmodule;
  71
  72   if (kmodule)
  73     {
  74       kmod_module_unref(kmodule);
  75       kmodule = NULL;
  76     }
  77
  78   if (!klist)
  79     {
  80       pci_fill_info(d->dev, PCI_FILL_MODULE_ALIAS);
  81       if (!d->dev->module_alias)
  82         return NULL;
  83       int err = kmod_module_new_from_lookup(kmod_ctx, d->dev->module_alias, &klist);
  84       if (err < 0)
  85         {
  86           fprintf(stderr, "lspci: libkmod lookup failed: error %d\n", err);
  87           return NULL;
  88         }
  89       kcurrent = klist;
  90     }
  91   else
  92     kcurrent = kmod_list_next(klist, kcurrent);
  93
  94   if (kcurrent)
  95     {
  96       kmodule = kmod_module_get_module(kcurrent);
  97       return kmod_module_get_name(kmodule);
  98     }
  99
 100   kmod_module_unref_list(klist);
 101   klist = NULL;
 102   return NULL;
 103 }
 104
 105 #else
 106
 107 struct pcimap_entry {
 108   struct pcimap_entry *next;
 109   unsigned int vendor, device;
 110   unsigned int subvendor, subdevice;
 111   unsigned int class, class_mask;
 112   char module[1];
 113 };
 114
 115 static struct pcimap_entry *pcimap_head;
 116
 117 static int
 118 show_kernel_init(void)
 119 {
 120   static int tried_pcimap;
 121   struct utsname uts;
 122   char *name, line[1024];
 123   FILE *f;
 124
 125   if (tried_pcimap)
 126     return 1;
 127   tried_pcimap = 1;
 128
 129   if (name = opt_pcimap)
 130     {
 131       f = fopen(name, "r");
 132       if (!f)
 133         die("Cannot open pcimap file %s: %m", name);
 134     }
 135   else
 136     {
 137       if (uname(&uts) < 0)
 138         die("uname() failed: %m");
 139       name = alloca(64 + strlen(uts.release));
 140       sprintf(name, "/lib/modules/%s/modules.pcimap", uts.release);
 141       f = fopen(name, "r");
 142       if (!f)
 143         return 1;
 144     }
 145
 146   while (fgets(line, sizeof(line), f))
 147     {
 148       char *c = strchr(line, '\n');
 149       struct pcimap_entry *e;
 150
 151       if (!c)
 152         die("Unterminated or too long line in %s", name);
 153       *c = 0;
 154       if (!line[0] || line[0] == '#')
 155         continue;
 156
 157       c = line;
 158       while (*c && *c != ' ' && *c != '\t')
 159         c++;
 160       if (!*c)
 161         continue;       /* FIXME: Emit warnings! */
 162       *c++ = 0;
 163
 164       e = xmalloc(sizeof(*e) + strlen(line));
 165       if (sscanf(c, "%i%i%i%i%i%i",
 166                  &e->vendor, &e->device,
 167                  &e->subvendor, &e->subdevice,
 168                  &e->class, &e->class_mask) != 6)
 169         continue;
 170       e->next = pcimap_head;
 171       pcimap_head = e;
 172       strcpy(e->module, line);
 173     }
 174   fclose(f);
 175
 176   return 1;
 177 }
 178
 179 static int
 180 match_pcimap(struct device *d, struct pcimap_entry *e)
 181 {
 182   struct pci_dev *dev = d->dev;
 183   unsigned int class = get_conf_long(d, PCI_REVISION_ID) >> 8;
 184   word subv, subd;
 185
 186 #define MATCH(x, y) ((y) > 0xffff || (x) == (y))
 187   get_subid(d, &subv, &subd);
 188   return
 189     MATCH(dev->vendor_id, e->vendor) &&
 190     MATCH(dev->device_id, e->device) &&
 191     MATCH(subv, e->subvendor) &&
 192     MATCH(subd, e->subdevice) &&
 193     (class & e->class_mask) == e->class;
 194 #undef MATCH
 195 }
 196
 197 static const char *next_module(struct device *d)
 198 {
 199   static struct pcimap_entry *current, *last_printed;
 200
 201   if (!current)
 202     {
 203       current = pcimap_head;
 204       last_printed = NULL;
 205     }
 206   else
 207     current = current->next;
 208
 209   while (current)
 210     {
 211       if (match_pcimap(d, current) && (!last_printed || strcmp(last_printed->module, current->module)))
 212         return current->module;
 213       current = current->next;
 214     }
 215
 216   return NULL;
 217 }
 218
 219 void
 220 show_kernel_cleanup(void)
 221 {
 222 }
 223
 224 #endif
 225
 226 #define DRIVER_BUF_SIZE 1024
 227
 228 static char *
 229 find_driver(struct device *d, char *buf)
 230 {
 231   struct pci_dev *dev = d->dev;
 232   char name[1024], *drv, *base;
 233   int n;
 234
 235   if (dev->access->method != PCI_ACCESS_SYS_BUS_PCI)
 236     return NULL;
 237
 238   base = pci_get_param(dev->access, "sysfs.path");
 239   if (!base || !base[0])
 240     return NULL;
 241
 242   n = snprintf(name, sizeof(name), "%s/devices/%04x:%02x:%02x.%d/driver",
 243                base, dev->domain, dev->bus, dev->dev, dev->func);
 244   if (n < 0 || n >= (int)sizeof(name))
 245     die("show_driver: sysfs device name too long, why?");
 246
 247   n = readlink(name, buf, DRIVER_BUF_SIZE);
 248   if (n < 0)
 249     return NULL;
 250   if (n >= DRIVER_BUF_SIZE)
 251     return "<name-too-long>";
 252   buf[n] = 0;
 253
 254   if (drv = strrchr(buf, '/'))
 255     return drv+1;
 256   else
 257     return buf;
 258 }
 259
 260 void
 261 show_kernel(struct device *d)
 262 {
 263   char buf[DRIVER_BUF_SIZE];
 264   const char *driver, *module;
 265
 266   if (driver = find_driver(d, buf))
 267     printf("\tKernel driver in use: %s\n", driver);
 268
 269   if (!show_kernel_init())
 270     return;
 271
 272   int cnt = 0;
 273   while (module = next_module(d))
 274     printf("%s %s", (cnt++ ? "," : "\tKernel modules:"), module);
 275   if (cnt)
 276     putchar('\n');
 277 }
 278
 279 void
 280 show_kernel_machine(struct device *d)
 281 {
 282   char buf[DRIVER_BUF_SIZE];
 283   const char *driver, *module;
 284
 285   if (driver = find_driver(d, buf))
 286     printf("Driver:\t%s\n", driver);
 287
 288   if (!show_kernel_init())
 289     return;
 290
 291   while (module = next_module(d))
 292     printf("Module:\t%s\n", module);
 293 }
 294
 295 #else
 296
 297 void
 298 show_kernel(struct device *d UNUSED)
 299 {
 300 }
 301
 302 void
 303 show_kernel_machine(struct device *d UNUSED)
 304 {
 305 }
 306
 307 void
 308 show_kernel_cleanup(void)
 309 {
 310 }
 311
 312 #endif
 313