From de44994dfcd433afbbf6d867a8dc6f4d0979b2f6 Mon Sep 17 00:00:00 2001
From: Scott Anderson <ascent12@hotmail.com>
Date: Sat, 3 Jun 2017 15:47:33 +1200
Subject: [PATCH] Udev event device matching

---
 backend/drm/backend.c  | 23 ++++++++++++++++++++---
 backend/drm/drm.c      |  1 -
 backend/udev.c         | 15 ++-------------
 include/backend/udev.h |  1 -
 4 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/backend/drm/backend.c b/backend/drm/backend.c
index bceb2184..73ccf413 100644
--- a/backend/drm/backend.c
+++ b/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>
@@ -30,7 +31,6 @@ static void wlr_drm_backend_destroy(struct wlr_backend_state *state) {
 	}
 	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 +73,31 @@ 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);
-	wlr_drm_scan_connectors(drm);
+	dev_t *dev = data;
+
+	if (drm->dev == *dev) {
+		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));
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 483c923c..27a5932f 100644
--- a/backend/drm/drm.c
+++ b/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);
 }
 
diff --git a/backend/udev.c b/backend/udev.c
index 30c24e49..f9577c12 100644
--- a/backend/udev.c
+++ b/backend/udev.c
@@ -73,7 +73,6 @@ 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 +116,6 @@ 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 +126,6 @@ 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 +138,16 @@ 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);
+	wl_signal_emit(&udev->invalidate_drm, &devnum);
 
 out:
 	udev_device_unref(dev);
@@ -216,5 +206,4 @@ void wlr_udev_destroy(struct wlr_udev *udev) {
 
 	udev_monitor_unref(udev->mon);
 	udev_unref(udev->udev);
-	free(udev->drm_path);
 }
diff --git a/include/backend/udev.h b/include/backend/udev.h
index c5064279..0ff35bfa 100644
--- a/include/backend/udev.h
+++ b/include/backend/udev.h
@@ -9,7 +9,6 @@
 struct wlr_udev {
 	struct udev *udev;
 	struct udev_monitor *mon;
-	char *drm_path;
 	struct wl_event_source *event;
 	struct wl_signal invalidate_drm;
 };