int
main(void)
{
drmDevicePtr *devices;
drmDevicePtr device;
int fd, ret, max_devices;
max_devices = drmGetDevices(NULL, 0);
if (max_devices <= 0) {
printf("drmGetDevices() has returned %d\n", max_devices);
return -1;
}
devices = calloc(max_devices, sizeof(drmDevicePtr));
if (devices == NULL) {
printf("Failed to allocate memory for the drmDevicePtr array\n");
return -1;
}
ret = drmGetDevices(devices, max_devices);
if (ret < 0) {
printf("drmGetDevices() returned an error %d\n", ret);
free(devices);
return -1;
}
for (int i = 0; i < ret; i++) {
print_device_info(devices[i], i);
for (int j = 0; j < DRM_NODE_MAX; j++) {
if (devices[i]->available_nodes & 1 << j) {
printf("Opening device %d node %s\n", i, devices[i]->nodes[j]);
fd = open(devices[i]->nodes[j], O_RDONLY | O_CLOEXEC, 0);
if (fd < 0) {
printf("Failed - %s (%d)\n", strerror(errno), errno);
continue;
}
if (drmGetDevice(fd, &device) == 0) {
print_device_info(device, i);
drmFreeDevice(&device);
}
close(fd);
}
}
}
drmFreeDevices(devices, ret);
free(devices);
return 0;
}
int loader_get_user_preferred_fd(int default_fd, int *different_device)
{
/* Arbitrary "maximum" value of drm devices. */
#define MAX_DRM_DEVICES 32
const char *dri_prime = getenv("DRI_PRIME");
char *default_tag, *prime = NULL;
drmDevicePtr devices[MAX_DRM_DEVICES];
int i, num_devices, fd;
bool found = false;
if (dri_prime)
prime = strdup(dri_prime);
#ifdef USE_DRICONF
else
prime = loader_get_dri_config_device_id();
#endif
if (prime == NULL) {
*different_device = 0;
return default_fd;
}
default_tag = drm_get_id_path_tag_for_fd(default_fd);
if (default_tag == NULL)
goto err;
num_devices = drmGetDevices(devices, MAX_DRM_DEVICES);
if (num_devices < 0)
goto err;
/* two format are supported:
* "1": choose any other card than the card used by default.
* id_path_tag: (for example "pci-0000_02_00_0") choose the card
* with this id_path_tag.
*/
if (!strcmp(prime,"1")) {
/* Hmm... detection for 2-7 seems to be broken. Oh well ...
* Pick the first render device that is not our own.
*/
for (i = 0; i < num_devices; i++) {
if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
!drm_device_matches_tag(devices[i], default_tag)) {
found = true;
break;
}
}
} else {
for (i = 0; i < num_devices; i++) {
if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
drm_device_matches_tag(devices[i], prime)) {
found = true;
break;
}
}
}
if (!found) {
drmFreeDevices(devices, num_devices);
goto err;
}
fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
drmFreeDevices(devices, num_devices);
if (fd < 0)
goto err;
close(default_fd);
*different_device = !!strcmp(default_tag, prime);
free(default_tag);
free(prime);
return fd;
err:
*different_device = 0;
free(default_tag);
free(prime);
return default_fd;
}
