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161 lines
3.1 KiB
161 lines
3.1 KiB
#define _POSIX_C_SOURCE 200809L
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#include <libudev.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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#include "backend/drm/otd.h"
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#include "backend/drm/udev.h"
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#include "backend/drm/session.h"
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#include "backend/drm/drm.h"
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static bool device_is_kms(struct otd *otd, struct udev_device *dev)
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{
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const char *path = udev_device_get_devnode(dev);
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int fd;
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if (!path)
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return false;
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fd = take_device(otd, path, &otd->paused);
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if (fd < 0)
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return false;
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drmModeRes *res = drmModeGetResources(fd);
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if (!res)
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goto out_fd;
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if (res->count_crtcs <= 0 || res->count_connectors <= 0 ||
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res->count_encoders <= 0)
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goto out_res;
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if (otd->fd >= 0) {
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release_device(otd, otd->fd);
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free(otd->drm_path);
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}
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otd->fd = fd;
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otd->drm_path = strdup(path);
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drmModeFreeResources(res);
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return true;
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out_res:
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drmModeFreeResources(res);
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out_fd:
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release_device(otd, fd);
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return false;
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}
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void otd_udev_find_gpu(struct otd *otd)
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{
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struct udev *udev = otd->udev;
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otd->fd = -1;
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struct udev_enumerate *en = udev_enumerate_new(udev);
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if (!en)
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return;
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udev_enumerate_add_match_subsystem(en, "drm");
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udev_enumerate_add_match_sysname(en, "card[0-9]*");
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udev_enumerate_scan_devices(en);
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struct udev_list_entry *entry;
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udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(en)) {
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bool is_boot_vga = false;
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const char *path = udev_list_entry_get_name(entry);
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struct udev_device *dev = udev_device_new_from_syspath(udev, path);
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if (!dev)
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continue;
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const char *seat = udev_device_get_property_value(dev, "ID_SEAT");
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if (!seat)
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seat = "seat0";
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if (strcmp(otd->session.seat, seat) != 0) {
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udev_device_unref(dev);
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continue;
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}
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struct udev_device *pci =
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udev_device_get_parent_with_subsystem_devtype(dev,
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"pci", NULL);
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if (pci) {
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const char *id = udev_device_get_sysattr_value(pci, "boot_vga");
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if (id && strcmp(id, "1") == 0)
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is_boot_vga = true;
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udev_device_unref(pci);
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}
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if (!is_boot_vga && otd->fd >= 0) {
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udev_device_unref(dev);
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continue;
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}
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if (!device_is_kms(otd, dev)) {
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udev_device_unref(dev);
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continue;
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}
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if (is_boot_vga) {
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break;
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}
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}
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udev_enumerate_unref(en);
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}
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bool otd_udev_start(struct otd *otd)
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{
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otd->udev = udev_new();
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if (!otd->udev)
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return false;
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otd->mon = udev_monitor_new_from_netlink(otd->udev, "udev");
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if (!otd->mon) {
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udev_unref(otd->udev);
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return false;
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}
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udev_monitor_filter_add_match_subsystem_devtype(otd->mon, "drm", NULL);
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udev_monitor_enable_receiving(otd->mon);
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otd->udev_fd = udev_monitor_get_fd(otd->mon);
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return true;
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}
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void otd_udev_finish(struct otd *otd)
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{
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if (!otd)
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return;
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udev_monitor_unref(otd->mon);
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udev_unref(otd->udev);
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}
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void otd_udev_event(struct otd *otd)
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{
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struct udev_device *dev = udev_monitor_receive_device(otd->mon);
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if (!dev)
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return;
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const char *path = udev_device_get_devnode(dev);
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if (!path || strcmp(path, otd->drm_path) != 0)
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goto out;
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const char *action = udev_device_get_action(dev);
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if (!action || strcmp(action, "change") != 0)
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goto out;
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scan_connectors(otd);
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out:
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udev_device_unref(dev);
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}
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