DRM resource initalisation

backend/drm/backend.c

@@ -12,8 +12,8 @@
 #include <wlr/interfaces/wlr_output.h>
 #include <wlr/util/list.h>
 #include <wlr/util/log.h>
-#include "backend/udev.h"
-#include "backend/drm.h"
+#include <backend/udev.h>
+#include "drm.h"
 
 static bool wlr_drm_backend_init(struct wlr_backend_state *state) {
 	wlr_drm_scan_connectors(state);
@@ -131,6 +131,15 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
 	state->session_signal.notify = session_signal;
 	wl_signal_add(&session->session_signal, &state->session_signal);
 
+	if (drmSetClientCap(state->fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1)) {
+		wlr_log(L_INFO, "DRM universal planes unsupported");
+	}
+	if (drmSetClientCap(state->fd, DRM_CLIENT_CAP_ATOMIC, 1)) {
+		wlr_log(L_INFO, "Atomic modesetting unsupported");
+	}
+
+	wlr_drm_init_resources(state);
+
 	// TODO: what is the difference between the per-output renderer and this
 	// one?
 	if (!wlr_drm_renderer_init(&state->renderer, state->fd)) {

backend/drm/drm-properties.c

@@ -49,10 +49,10 @@ static const struct prop_info plane_info[] = {
 };
 
 static int cmp_prop_info(const void *arg1, const void *arg2) {
-	const struct prop_info *a = arg1;
-	const struct prop_info *b = arg2;
+	const char *key = arg1;
+	const struct prop_info *elem = arg2;
 
-	return strcmp(a->name, b->name);
+	return strcmp(key, elem->name);
 }
 
 static bool scan_properties(int fd, uint32_t id, uint32_t type, uint32_t *result,
@@ -97,3 +97,47 @@ bool wlr_drm_get_plane_props(int fd, uint32_t id, union wlr_drm_plane_props *out
 	return scan_properties(fd, id, DRM_MODE_OBJECT_PLANE, out->props,
 		plane_info, sizeof(plane_info) / sizeof(plane_info[0]));
 }
+
+bool wlr_drm_get_prop(int fd, uint32_t obj, uint32_t prop, uint64_t *ret) {
+	drmModeObjectProperties *props = drmModeObjectGetProperties(fd, obj, DRM_MODE_OBJECT_ANY);
+	if (!props) {
+		return false;
+	}
+
+	bool found = false;
+
+	for (uint32_t i = 0; i < props->count_props; ++i) {
+		if (props->props[i] == prop) {
+			*ret = props->prop_values[i];
+			found = true;
+			break;
+		}
+	}
+
+	drmModeFreeObjectProperties(props);
+	return found;
+}
+
+void *wlr_drm_get_prop_blob(int fd, uint32_t obj, uint32_t prop, size_t *ret_len) {
+	uint64_t blob_id;
+	if (!wlr_drm_get_prop(fd, obj, prop, &blob_id)) {
+		return NULL;
+	}
+
+	drmModePropertyBlobRes *blob = drmModeGetPropertyBlob(fd, blob_id);
+	if (!blob) {
+		return NULL;
+	}
+
+	void *ptr = malloc(blob->length);
+	if (!ptr) {
+		drmModeFreePropertyBlob(blob);
+		return NULL;
+	}
+
+	memcpy(ptr, blob->data, blob->length);
+	*ret_len = blob->length;
+
+	drmModeFreePropertyBlob(blob);
+	return ptr;
+}

backend/drm/drm-properties.h

@@ -6,7 +6,7 @@
 
 /*
  * These types contain the property ids for several DRM objects.
- * See https://01.org/linuxgraphics/gfx-docs/drm/drm-kms-properties.html
+ * See https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-kms.html#kms-properties
  * for more details.
  */
 
@@ -56,4 +56,7 @@ bool wlr_drm_get_connector_props(int fd, uint32_t id, union wlr_drm_connector_pr
 bool wlr_drm_get_crtc_props(int fd, uint32_t id, union wlr_drm_crtc_props *out);
 bool wlr_drm_get_plane_props(int fd, uint32_t id, union wlr_drm_plane_props *out);
 
+bool wlr_drm_get_prop(int fd, uint32_t obj, uint32_t prop, uint64_t *ret);
+void *wlr_drm_get_prop_blob(int fd, uint32_t obj, uint32_t prop, size_t *ret_len);
+
 #endif

backend/drm/drm.c

@@ -15,7 +15,7 @@
 #include <wlr/backend/interface.h>
 #include <wlr/interfaces/wlr_output.h>
 #include <wlr/util/log.h>
-#include "backend/drm.h"
+#include "drm.h"
 
 static const char *conn_name[] = {
 	[DRM_MODE_CONNECTOR_Unknown]     = "Unknown",
@@ -37,6 +37,137 @@ static const char *conn_name[] = {
 	[DRM_MODE_CONNECTOR_DSI]         = "DSI",
 };
 
+static int cmp_plane(const void *arg1, const void *arg2)
+{
+	const struct wlr_drm_plane *a = arg1;
+	const struct wlr_drm_plane *b = arg2;
+
+	return (int)a->type - (int)b->type;
+}
+
+static bool init_planes(struct wlr_backend_state *drm)
+{
+	drmModePlaneRes *plane_res = drmModeGetPlaneResources(drm->fd);
+	if (!plane_res) {
+		wlr_log_errno(L_ERROR, "Failed to get DRM plane resources");
+		return false;
+	}
+
+	wlr_log(L_INFO, "Found %"PRIu32" DRM planes", plane_res->count_planes);
+
+	if (plane_res->count_planes == 0) {
+		drmModeFreePlaneResources(plane_res);
+		return true;
+	}
+
+	size_t num_planes = plane_res->count_planes;
+	struct wlr_drm_plane *planes = calloc(num_planes, sizeof(*planes));
+	if (!planes) {
+		wlr_log_errno(L_ERROR, "Allocation failed");
+		goto error_res;
+	}
+
+	size_t num_overlay = 0;
+	size_t num_primary = 0;
+	size_t num_cursor = 0;
+
+	for (size_t i = 0; i < num_planes; ++i) {
+		struct wlr_drm_plane *p = &planes[i];
+
+		drmModePlane *plane = drmModeGetPlane(drm->fd, plane_res->planes[i]);
+		if (!plane) {
+			wlr_log_errno(L_ERROR, "Failed to get DRM plane");
+			goto error_planes;
+		}
+
+		p->id = plane->plane_id;
+		p->possible_crtcs = plane->possible_crtcs;
+		uint64_t type;
+
+		if (!wlr_drm_get_plane_props(drm->fd, p->id, &p->props) ||
+				!wlr_drm_get_prop(drm->fd, p->id, p->props.type, &type)) {
+			drmModeFreePlane(plane);
+			goto error_planes;
+		}
+
+		p->type = type;
+
+		switch (type) {
+		case DRM_PLANE_TYPE_OVERLAY:
+			++num_overlay;
+			break;
+		case DRM_PLANE_TYPE_PRIMARY:
+			++num_primary;
+			break;
+		case DRM_PLANE_TYPE_CURSOR:
+			++num_cursor;
+			break;
+		}
+
+		drmModeFreePlane(plane);
+	}
+
+	wlr_log(L_INFO, "(%zu overlay, %zu primary, %zu cursor)",
+		num_overlay, num_primary, num_cursor);
+
+	qsort(planes, num_planes, sizeof(*planes), cmp_plane);
+
+	drm->num_planes = num_planes;
+	drm->num_overlay_planes = num_overlay;
+	drm->num_primary_planes = num_primary;
+	drm->num_cursor_planes = num_cursor;
+
+	drm->planes = planes;
+	drm->overlay_planes = planes;
+	drm->primary_planes = planes + num_overlay;
+	drm->cursor_planes = planes + num_overlay + num_primary;
+
+	return true;
+
+error_planes:
+	free(planes);
+error_res:
+	drmModeFreePlaneResources(plane_res);
+	return false;
+}
+
+bool wlr_drm_init_resources(struct wlr_backend_state *drm) {
+	drmModeRes *res = drmModeGetResources(drm->fd);
+	if (!res) {
+		wlr_log_errno(L_ERROR, "Failed to get DRM resources");
+		return false;
+	}
+
+	wlr_log(L_INFO, "Found %d DRM CRTCs", res->count_crtcs);
+
+	drm->num_crtcs = res->count_crtcs;
+	drm->crtcs = calloc(drm->num_crtcs, sizeof(drm->crtcs[0]));
+	if (!drm->crtcs) {
+		wlr_log_errno(L_ERROR, "Allocation failed");
+		goto error_res;
+	}
+
+	for (size_t i = 0; i < drm->num_crtcs; ++i) {
+		struct wlr_drm_crtc *crtc = &drm->crtcs[i];
+		crtc->id = res->crtcs[i];
+		wlr_drm_get_crtc_props(drm->fd, crtc->id, &crtc->props);
+	}
+
+	if (!init_planes(drm)) {
+		goto error_crtcs;
+	}
+
+	drmModeFreeResources(res);
+
+	return true;
+
+error_crtcs:
+	free(drm->crtcs);
+error_res:
+	drmModeFreeResources(res);
+	return false;
+}
+
 bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd) {
 	renderer->gbm = gbm_create_device(fd);
 	if (!renderer->gbm) {

backend/drm/drm.h

@@ -14,8 +14,37 @@
 #include <wlr/backend/drm.h>
 #include <wlr/util/list.h>
 
-#include "backend/egl.h"
-#include "backend/udev.h"
+#include <backend/egl.h>
+#include <backend/udev.h>
+#include "drm-properties.h"
+
+struct wlr_drm_plane {
+	uint32_t type;
+	uint32_t id;
+	uint32_t fb_id;
+
+	uint32_t possible_crtcs;
+
+	int32_t x, y;
+	uint32_t width, height;
+
+	struct gbm_surface *gbm;
+	EGLSurface egl;
+
+	struct gbm_bo *front;
+	struct gbm_bo *back;
+
+	union wlr_drm_plane_props props;
+};
+
+struct wlr_drm_crtc {
+	uint32_t id;
+	struct wlr_drm_plane *primary;
+	struct wlr_drm_plane *overlay;
+	struct wlr_drm_plane *cursor;
+	
+	union wlr_drm_crtc_props props;
+};
 
 struct wlr_drm_renderer {
 	int fd;
@@ -30,6 +59,18 @@ struct wlr_backend_state {
 	int fd;
 	dev_t dev;
 
+	size_t num_crtcs;
+	struct wlr_drm_crtc *crtcs;
+	size_t num_planes;
+	struct wlr_drm_plane *planes;
+
+	size_t num_overlay_planes;
+	struct wlr_drm_plane *overlay_planes;
+	size_t num_primary_planes;
+	struct wlr_drm_plane *primary_planes;
+	size_t num_cursor_planes;
+	struct wlr_drm_plane *cursor_planes;
+
 	struct wlr_backend *backend;
 	struct wl_display *display;
 	struct wl_event_source *drm_event;
@@ -83,6 +124,7 @@ struct wlr_output_state {
 	bool cleanup;
 };
 
+bool wlr_drm_init_resources(struct wlr_backend_state *drm);
 void wlr_drm_output_cleanup(struct wlr_output_state *output, bool restore);
 
 void wlr_drm_scan_connectors(struct wlr_backend_state *state);