diff options
Diffstat (limited to 'backend/udev.c')
| -rw-r--r-- | backend/udev.c | 252 |
1 files changed, 0 insertions, 252 deletions
diff --git a/backend/udev.c b/backend/udev.c deleted file mode 100644 index a2492172..00000000 --- a/backend/udev.c +++ /dev/null @@ -1,252 +0,0 @@ -#define _POSIX_C_SOURCE 200809L -#include <libudev.h> -#include <stdbool.h> -#include <stdlib.h> -#include <string.h> -#include <stdint.h> -#include <errno.h> -#include <xf86drm.h> -#include <xf86drmMode.h> -#include <wayland-server.h> -#include <wlr/backend/session.h> -#include <wlr/util/log.h> -#include "backend/udev.h" - -/* Tests if 'path' is KMS compatible by trying to open it. - * It leaves the open device in *fd_out it it succeeds. - */ -static bool device_is_kms(struct wlr_session *restrict session, - const char *restrict path, int *restrict fd_out) { - - int fd; - - if (!path) { - return false; - } - - fd = wlr_session_open_file(session, path); - 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 (*fd_out >= 0) { - wlr_session_close_file(session, *fd_out); - } - - *fd_out = fd; - - drmModeFreeResources(res); - return true; - -out_res: - drmModeFreeResources(res); -out_fd: - wlr_session_close_file(session, fd); - return false; -} - -/* Tries to find the primary GPU by checking for the "boot_vga" attribute. - * If it's not found, it returns the first valid GPU it finds. - */ -int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session) { - struct udev_enumerate *en = udev_enumerate_new(udev->udev); - if (!en) { - wlr_log(L_ERROR, "Failed to create udev enumeration"); - return -1; - } - - 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; - int fd = -1; - - 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->udev, path); - if (!dev) { - continue; - } - - /* - const char *seat = udev_device_get_property_value(dev, "ID_SEAT"); - if (!seat) - seat = "seat0"; - if (strcmp(session->seat, seat) != 0) { - udev_device_unref(dev); - continue; - } - */ - - // This is owned by 'dev', so we don't need to free it - 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; - } - } - - // We already have a valid GPU - if (!is_boot_vga && fd >= 0) { - udev_device_unref(dev); - continue; - } - - path = udev_device_get_devnode(dev); - if (!device_is_kms(session, path, &fd)) { - udev_device_unref(dev); - continue; - } - - udev_device_unref(dev); - - // We've found the primary GPU - if (is_boot_vga) { - break; - } - } - - udev_enumerate_unref(en); - - return fd; -} - -static int udev_event(int fd, uint32_t mask, void *data) { - struct wlr_udev *udev = data; - - struct udev_device *dev = udev_monitor_receive_device(udev->mon); - if (!dev) { - return 1; - } - - const char *action = udev_device_get_action(dev); - - wlr_log(L_DEBUG, "udev event for %s (%s)", - udev_device_get_sysname(dev), action); - - if (!action || strcmp(action, "change") != 0) { - goto out; - } - - dev_t devnum = udev_device_get_devnum(dev); - struct wlr_udev_dev *signal; - - wl_list_for_each(signal, &udev->devices, link) { - if (signal->dev == devnum) { - wl_signal_emit(&signal->invalidate, udev); - break; - } - } - -out: - udev_device_unref(dev); - return 1; -} - -struct wlr_udev *wlr_udev_create(struct wl_display *display) { - struct wlr_udev *udev = calloc(sizeof(struct wlr_udev), 1); - if (!udev) { - return NULL; - } - udev->udev = udev_new(); - if (!udev->udev) { - wlr_log(L_ERROR, "Failed to create udev context"); - goto error; - } - - udev->mon = udev_monitor_new_from_netlink(udev->udev, "udev"); - if (!udev->mon) { - wlr_log(L_ERROR, "Failed to create udev monitor"); - goto error_udev; - } - - udev_monitor_filter_add_match_subsystem_devtype(udev->mon, "drm", NULL); - udev_monitor_enable_receiving(udev->mon); - - struct wl_event_loop *event_loop = wl_display_get_event_loop(display); - int fd = udev_monitor_get_fd(udev->mon); - - udev->event = wl_event_loop_add_fd(event_loop, fd, WL_EVENT_READABLE, - udev_event, udev); - if (!udev->event) { - wlr_log(L_ERROR, "Failed to create udev event source"); - goto error_mon; - } - - wl_list_init(&udev->devices); - - wlr_log(L_DEBUG, "Successfully initialized udev"); - return udev; - -error_mon: - udev_monitor_unref(udev->mon); -error_udev: - udev_unref(udev->udev); -error: - free(udev); - return NULL; -} - -void wlr_udev_destroy(struct wlr_udev *udev) { - if (!udev) { - return; - } - - struct wlr_udev_dev *dev, *tmp; - wl_list_for_each_safe(dev, tmp, &udev->devices, link) { - free(dev); - } - - wl_event_source_remove(udev->event); - udev_monitor_unref(udev->mon); - udev_unref(udev->udev); - free(udev); -} - -bool wlr_udev_signal_add(struct wlr_udev *udev, dev_t dev, struct wl_listener *listener) { - struct wlr_udev_dev *device = malloc(sizeof(*device)); - if (!device) { - wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno)); - return false; - } - - device->dev = dev; - wl_signal_init(&device->invalidate); - wl_signal_add(&device->invalidate, listener); - wl_list_insert(&udev->devices, &device->link); - - return true; -} - -void wlr_udev_signal_remove(struct wlr_udev *udev, struct wl_listener *listener) { - if (!udev || !listener) { - return; - } - - struct wlr_udev_dev *dev, *tmp; - wl_list_for_each_safe(dev, tmp, &udev->devices, link) { - // The signal should only have a single listener - if (wl_signal_get(&dev->invalidate, listener->notify) != NULL) { - wl_list_remove(&dev->link); - free(dev); - return; - } - } -} |