170 lines
3.4 KiB
C
170 lines
3.4 KiB
C
#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/backend.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 wlr_udev *udev,
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struct wlr_session *session,
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struct udev_device *dev,
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int *fd_out)
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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 = wlr_session_take_device(session, path, NULL);
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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 (*fd_out >= 0) {
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wlr_session_release_device(session, *fd_out);
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free(udev->drm_path);
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}
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*fd_out = fd;
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udev->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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wlr_session_release_device(session, fd);
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return false;
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}
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int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session)
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{
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int fd = -1;
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struct udev_enumerate *en = udev_enumerate_new(udev->udev);
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if (!en)
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return -1;
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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->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(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 && 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(udev, session, dev, &fd)) {
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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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return fd;
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}
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bool wlr_udev_init(struct wlr_udev *udev)
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{
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udev->udev = udev_new();
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if (!udev->udev)
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return false;
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udev->mon = udev_monitor_new_from_netlink(udev->udev, "udev");
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if (!udev->mon) {
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udev_unref(udev->udev);
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return false;
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}
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udev_monitor_filter_add_match_subsystem_devtype(udev->mon, "drm", NULL);
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udev_monitor_enable_receiving(udev->mon);
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udev->mon_fd = udev_monitor_get_fd(udev->mon);
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udev->drm_path = NULL;
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return true;
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}
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void wlr_udev_free(struct wlr_udev *udev)
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{
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if (!udev)
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return;
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udev_monitor_unref(udev->mon);
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udev_unref(udev->udev);
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free(udev->drm_path);
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}
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void wlr_udev_event(struct wlr_drm_backend *backend)
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{
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struct wlr_udev *udev = &backend->udev;
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struct udev_device *dev = udev_monitor_receive_device(udev->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, udev->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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wlr_drm_scan_connectors(backend);
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out:
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udev_device_unref(dev);
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}
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