drm/plane: add drmm_universal_plane_alloc()

Add an alternative to drm_universal_plane_init() that allocates
and initializes a plane and registers drm_plane_cleanup() with
drmm_add_action_or_reset().

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 105 insertions, 29 deletions

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index e6231947f987..8b9471a59919 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -30,6 +30,7 @@
 #include <drm/drm_file.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fourcc.h>
+#include <drm/drm_managed.h>
 #include <drm/drm_vblank.h>
 
 #include "drm_crtc_internal.h"
@@ -152,31 +153,16 @@ done:
 	return 0;
 }
 
-/**
- * drm_universal_plane_init - Initialize a new universal plane object
- * @dev: DRM device
- * @plane: plane object to init
- * @possible_crtcs: bitmask of possible CRTCs
- * @funcs: callbacks for the new plane
- * @formats: array of supported formats (DRM_FORMAT\_\*)
- * @format_count: number of elements in @formats
- * @format_modifiers: array of struct drm_format modifiers terminated by
- *                    DRM_FORMAT_MOD_INVALID
- * @type: type of plane (overlay, primary, cursor)
- * @name: printf style format string for the plane name, or NULL for default name
- *
- * Initializes a plane object of type @type.
- *
- * Returns:
- * Zero on success, error code on failure.
- */
-int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
-			     uint32_t possible_crtcs,
-			     const struct drm_plane_funcs *funcs,
-			     const uint32_t *formats, unsigned int format_count,
-			     const uint64_t *format_modifiers,
-			     enum drm_plane_type type,
-			     const char *name, ...)
+__printf(9, 0)
+static int __drm_universal_plane_init(struct drm_device *dev,
+				      struct drm_plane *plane,
+				      uint32_t possible_crtcs,
+				      const struct drm_plane_funcs *funcs,
+				      const uint32_t *formats,
+				      unsigned int format_count,
+				      const uint64_t *format_modifiers,
+				      enum drm_plane_type type,
+				      const char *name, va_list ap)
 {
 	struct drm_mode_config *config = &dev->mode_config;
 	unsigned int format_modifier_count = 0;
@@ -237,11 +223,7 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
 	}
 
 	if (name) {
-		va_list ap;
-
-		va_start(ap, name);
 		plane->name = kvasprintf(GFP_KERNEL, name, ap);
-		va_end(ap);
 	} else {
 		plane->name = kasprintf(GFP_KERNEL, "plane-%d",
 					drm_num_planes(dev));
@@ -286,8 +268,102 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
 
 	return 0;
 }
+
+/**
+ * drm_universal_plane_init - Initialize a new universal plane object
+ * @dev: DRM device
+ * @plane: plane object to init
+ * @possible_crtcs: bitmask of possible CRTCs
+ * @funcs: callbacks for the new plane
+ * @formats: array of supported formats (DRM_FORMAT\_\*)
+ * @format_count: number of elements in @formats
+ * @format_modifiers: array of struct drm_format modifiers terminated by
+ *                    DRM_FORMAT_MOD_INVALID
+ * @type: type of plane (overlay, primary, cursor)
+ * @name: printf style format string for the plane name, or NULL for default name
+ *
+ * Initializes a plane object of type @type. The &drm_plane_funcs.destroy hook
+ * should call drm_plane_cleanup() and kfree() the plane structure. The plane
+ * structure should not be allocated with devm_kzalloc().
+ *
+ * Note: consider using drmm_universal_plane_alloc() instead of
+ * drm_universal_plane_init() to let the DRM managed resource infrastructure
+ * take care of cleanup and deallocation.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
+			     uint32_t possible_crtcs,
+			     const struct drm_plane_funcs *funcs,
+			     const uint32_t *formats, unsigned int format_count,
+			     const uint64_t *format_modifiers,
+			     enum drm_plane_type type,
+			     const char *name, ...)
+{
+	va_list ap;
+	int ret;
+
+	WARN_ON(!funcs->destroy);
+
+	va_start(ap, name);
+	ret = __drm_universal_plane_init(dev, plane, possible_crtcs, funcs,
+					 formats, format_count, format_modifiers,
+					 type, name, ap);
+	va_end(ap);
+	return ret;
+}
 EXPORT_SYMBOL(drm_universal_plane_init);
 
+static void drmm_universal_plane_alloc_release(struct drm_device *dev, void *ptr)
+{
+	struct drm_plane *plane = ptr;
+
+	if (WARN_ON(!plane->dev))
+		return;
+
+	drm_plane_cleanup(plane);
+}
+
+void *__drmm_universal_plane_alloc(struct drm_device *dev, size_t size,
+				   size_t offset, uint32_t possible_crtcs,
+				   const struct drm_plane_funcs *funcs,
+				   const uint32_t *formats, unsigned int format_count,
+				   const uint64_t *format_modifiers,
+				   enum drm_plane_type type,
+				   const char *name, ...)
+{
+	void *container;
+	struct drm_plane *plane;
+	va_list ap;
+	int ret;
+
+	if (WARN_ON(!funcs || funcs->destroy))
+		return ERR_PTR(-EINVAL);
+
+	container = drmm_kzalloc(dev, size, GFP_KERNEL);
+	if (!container)
+		return ERR_PTR(-ENOMEM);
+
+	plane = container + offset;
+
+	va_start(ap, name);
+	ret = __drm_universal_plane_init(dev, plane, possible_crtcs, funcs,
+					 formats, format_count, format_modifiers,
+					 type, name, ap);
+	va_end(ap);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = drmm_add_action_or_reset(dev, drmm_universal_plane_alloc_release,
+				       plane);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return container;
+}
+EXPORT_SYMBOL(__drmm_universal_plane_alloc);
+
 int drm_plane_register_all(struct drm_device *dev)
 {
 	unsigned int num_planes = 0;