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#include <libudev.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "otd.h"
#include "udev.h"
#include "session.h"
#include "drm.h"
static bool device_is_kms(struct otd *otd, struct udev_device *dev)
{
const char *path = udev_device_get_devnode(dev);
int fd;
if (!path)
return false;
fd = take_device(otd, path, &otd->paused);
if (fd < 0)
return false;
drmModeRes *res = drmModeGetResources(fd);
if (!res)
goto out_fd;
if (res->count_crtcs <= 0 || res->count_connectors <= 0 ||
res->count_encoders <= 0)
goto out_res;
if (otd->fd >= 0) {
release_device(otd, otd->fd);
free(otd->drm_path);
}
otd->fd = fd;
otd->drm_path = strdup(path);
drmModeFreeResources(res);
return true;
out_res:
drmModeFreeResources(res);
out_fd:
release_device(otd, fd);
return false;
}
void otd_udev_find_gpu(struct otd *otd)
{
struct udev *udev = otd->udev;
otd->fd = -1;
struct udev_enumerate *en = udev_enumerate_new(udev);
if (!en)
return;
udev_enumerate_add_match_subsystem(en, "drm");
udev_enumerate_add_match_sysname(en, "card[0-9]*");
udev_enumerate_scan_devices(en);
struct udev_list_entry *entry;
udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(en)) {
bool is_boot_vga = false;
const char *path = udev_list_entry_get_name(entry);
struct udev_device *dev = udev_device_new_from_syspath(udev, path);
if (!dev)
continue;
const char *seat = udev_device_get_property_value(dev, "ID_SEAT");
if (!seat)
seat = "seat0";
if (strcmp(otd->session.seat, seat) != 0) {
udev_device_unref(dev);
continue;
}
struct udev_device *pci =
udev_device_get_parent_with_subsystem_devtype(dev,
"pci", NULL);
if (pci) {
const char *id = udev_device_get_sysattr_value(pci, "boot_vga");
if (id && strcmp(id, "1") == 0)
is_boot_vga = true;
udev_device_unref(pci);
}
if (!is_boot_vga && otd->fd >= 0) {
udev_device_unref(dev);
continue;
}
if (!device_is_kms(otd, dev)) {
udev_device_unref(dev);
continue;
}
if (is_boot_vga) {
break;
}
}
udev_enumerate_unref(en);
}
bool otd_udev_start(struct otd *otd)
{
otd->udev = udev_new();
if (!otd->udev)
return false;
otd->mon = udev_monitor_new_from_netlink(otd->udev, "udev");
if (!otd->mon) {
udev_unref(otd->udev);
return false;
}
udev_monitor_filter_add_match_subsystem_devtype(otd->mon, "drm", NULL);
udev_monitor_enable_receiving(otd->mon);
otd->udev_fd = udev_monitor_get_fd(otd->mon);
return true;
}
void otd_udev_finish(struct otd *otd)
{
if (!otd)
return;
udev_monitor_unref(otd->mon);
udev_unref(otd->udev);
}
void otd_udev_event(struct otd *otd)
{
struct udev_device *dev = udev_monitor_receive_device(otd->mon);
if (!dev)
return;
const char *path = udev_device_get_devnode(dev);
if (!path || strcmp(path, otd->drm_path) != 0)
goto out;
const char *action = udev_device_get_action(dev);
if (!action || strcmp(action, "change") != 0)
goto out;
scan_connectors(otd);
out:
udev_device_unref(dev);
}
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