Merge pull request #6 from ascent12/multi-gpu

Udev event device matching

backend/drm/backend.c

@@ -5,6 +5,7 @@
 #include <errno.h>
 #include <assert.h>
 #include <wayland-server.h>
+#include <xf86drm.h>
 #include <sys/stat.h>
 #include <wlr/session.h>
 #include <wlr/types.h>
@@ -28,9 +29,9 @@ static void wlr_drm_backend_destroy(struct wlr_backend_state *state) {
 		struct wlr_output_state *output = state->outputs->items[i];
 		wlr_output_destroy(output->wlr_output);
 	}
+	wlr_udev_signal_remove(state->udev, &state->drm_invalidated);
 	wlr_drm_renderer_free(&state->renderer);
 	wlr_session_close_file(state->session, state->fd);
-	wlr_session_finish(state->session);
 	wl_event_source_remove(state->drm_event);
 	free(state);
 }
@@ -73,14 +74,31 @@ static void device_resumed(struct wl_listener *listener, void *data) {
 	}
 }
 
-static void drm_invalidated(struct wl_listener *listener, void *state) {
+static void drm_invalidated(struct wl_listener *listener, void *data) {
 	struct wlr_backend_state *drm = wl_container_of(listener, drm, drm_invalidated);
+	struct wlr_udev *udev = data;
+
+	(void)udev;
+
+	char *name = drmGetDeviceNameFromFd2(drm->fd);
+	wlr_log(L_DEBUG, "%s invalidated", name);
+	free(name);
+
 	wlr_drm_scan_connectors(drm);
 }
 
 struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 		struct wlr_session *session, struct wlr_udev *udev, int gpu_fd) {
 	assert(display && session && gpu_fd > 0);
+
+	char *name = drmGetDeviceNameFromFd2(gpu_fd);
+	drmVersion *version = drmGetVersion(gpu_fd);
+
+	wlr_log(L_INFO, "Initalizing DRM backend for %s (%s)", name, version->name);
+
+	free(name);
+	drmFreeVersion(version);
+
 	struct wlr_backend_state *state = calloc(1, sizeof(struct wlr_backend_state));
 	if (!state) {
 		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
@@ -95,6 +113,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 
 	state->backend = backend;
 	state->session = session;
+	state->udev = udev;
 	state->outputs = list_create();
 	if (!state->outputs) {
 		wlr_log(L_ERROR, "Failed to allocate list");
@@ -102,9 +121,6 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 	}
 
 	state->fd = gpu_fd;
-	wl_list_init(&state->drm_invalidated.link);
-	state->drm_invalidated.notify = drm_invalidated;
-	wl_signal_add(&udev->invalidate_drm, &state->drm_invalidated);
 
 	struct stat st;
 	if (fstat(state->fd, &st) < 0) {
@@ -112,6 +128,9 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 	}
 	state->dev = st.st_rdev;
 
+	state->drm_invalidated.notify = drm_invalidated;
+	wlr_udev_signal_add(udev, state->dev, &state->drm_invalidated);
+
 	struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
 
 	state->drm_event = wl_event_loop_add_fd(event_loop, state->fd,

backend/drm/drm.c

@@ -276,7 +276,6 @@ static void wlr_drm_output_enable(struct wlr_output_state *output, bool enable)
 
 static void wlr_drm_output_destroy(struct wlr_output_state *output) {
 	wlr_drm_output_cleanup(output, true);
-	wlr_drm_renderer_free(output->renderer);
 	free(output);
 }
 

backend/udev.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
+#include <errno.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 #include <wayland-server.h>
@@ -73,7 +74,6 @@ int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session) {
 
 	struct udev_list_entry *entry;
 	int fd = -1;
-	char *drm_path = NULL;
 
 	udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(en)) {
 		bool is_boot_vga = false;
@@ -117,9 +117,6 @@ int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session) {
 			continue;
 		}
 
-		free(drm_path);
-		drm_path = strdup(path);
-
 		udev_device_unref(dev);
 
 		// We've found the primary GPU
@@ -130,7 +127,6 @@ int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session) {
 
 	udev_enumerate_unref(en);
 
-	udev->drm_path = drm_path;
 	return fd;
 }
 
@@ -143,21 +139,23 @@ static int udev_event(int fd, uint32_t mask, void *data) {
 	}
 
 	const char *action = udev_device_get_action(dev);
-	const char *path = udev_device_get_devnode(dev);
 
 	wlr_log(L_DEBUG, "udev event for %s (%s)",
 			udev_device_get_sysname(dev), action);
 
-	if (!path || strcmp(path, udev->drm_path) != 0) {
-		goto out;
-	}
-
 	if (!action || strcmp(action, "change") != 0) {
 		goto out;
 	}
 
-	// TODO: Specify the GPU that's being invalidated
-	wl_signal_emit(&udev->invalidate_drm, udev);
+	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);
@@ -174,7 +172,6 @@ struct wlr_udev *wlr_udev_create(struct wl_display *display) {
 		wlr_log(L_ERROR, "Failed to create udev context");
 		goto error;
 	}
-	wl_signal_init(&udev->invalidate_drm);
 
 	udev->mon = udev_monitor_new_from_netlink(udev->udev, "udev");
 	if (!udev->mon) {
@@ -195,6 +192,8 @@ struct wlr_udev *wlr_udev_create(struct wl_display *display) {
 		goto error_mon;
 	}
 	
+	wl_list_init(&udev->devices);
+
 	wlr_log(L_DEBUG, "Successfully initialized udev");
 	return udev;
 
@@ -212,9 +211,43 @@ void wlr_udev_destroy(struct wlr_udev *udev) {
 		return;
 	}
 
-	wl_event_source_remove(udev->event);
+	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->drm_path);
+}
+
+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;
+		}
+	}
 }

include/backend/udev.h

@@ -1,19 +1,29 @@
 #ifndef _WLR_INTERNAL_UDEV_H
 #define _WLR_INTERNAL_UDEV_H
 
+#include <sys/types.h>
 #include <libudev.h>
 #include <wlr/session.h>
 #include <wayland-server.h>
 #include <wlr/backend/udev.h>
 
+struct wlr_udev_dev {
+	dev_t dev;
+	struct wl_signal invalidate;
+
+	struct wl_list link;
+};
+
 struct wlr_udev {
 	struct udev *udev;
 	struct udev_monitor *mon;
-	char *drm_path;
 	struct wl_event_source *event;
-	struct wl_signal invalidate_drm;
+
+	struct wl_list devices;
 };
 
 int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session);
+bool wlr_udev_signal_add(struct wlr_udev *udev, dev_t dev, struct wl_listener *listener);
+void wlr_udev_signal_remove(struct wlr_udev *udev, struct wl_listener *listener);
 
 #endif