+#elif defined (__FreeBSD__) || defined (__FreeBSD_kernel__)
+ char kbusid[1024], sbusid[1024];
+ char oid[128];
+ int domain, bus, dev, func;
+ int i, modesetting, ret;
+ size_t len;
+
+ ret = sscanf(busid, "pci:%04x:%02x:%02x.%d", &domain, &bus, &dev,
+ &func);
+ if (ret != 4)
+ return -EINVAL;
+ snprintf(kbusid, sizeof(kbusid), "pci:%04x:%02x:%02x.%d", domain, bus,
+ dev, func);
+
+ /* How many GPUs do we expect in the machine ? */
+ for (i = 0; i < 16; i++) {
+ snprintf(oid, sizeof(oid), "hw.dri.%d.busid", i);
+ len = sizeof(sbusid);
+ ret = sysctlbyname(oid, sbusid, &len, NULL, 0);
+ if (ret == -1) {
+ if (errno == ENOENT)
+ continue;
+ return -EINVAL;
+ }
+ if (strcmp(sbusid, kbusid) != 0)
+ continue;
+ snprintf(oid, sizeof(oid), "hw.dri.%d.modesetting", i);
+ len = sizeof(modesetting);
+ ret = sysctlbyname(oid, &modesetting, &len, NULL, 0);
+ if (ret == -1 || len != sizeof(modesetting))
+ return -EINVAL;
+ return (modesetting ? 0 : -ENOSYS);
+ }
+#elif defined(__DragonFly__)
+ return 0;