From ca5092d04d86986c03b6e0042e2f1cd119c50f5d Mon Sep 17 00:00:00 2001
From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Thu, 10 Dec 2020 16:38:28 +0100
Subject: drm: add drmm_encoder_alloc()

Add an alternative to drm_encoder_init() that allocates and initializes
an encoder and registers drm_encoder_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>
---
 drivers/gpu/drm/drm_encoder.c | 109 +++++++++++++++++++++++++++++++++---------
 1 file changed, 86 insertions(+), 23 deletions(-)

(limited to 'drivers/gpu/drm')

diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index b0b86a3c08f5..72e982323a5e 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -26,6 +26,7 @@
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_encoder.h>
+#include <drm/drm_managed.h>
 
 #include "drm_crtc_internal.h"
 
@@ -91,25 +92,11 @@ void drm_encoder_unregister_all(struct drm_device *dev)
 	}
 }
 
-/**
- * drm_encoder_init - Init a preallocated encoder
- * @dev: drm device
- * @encoder: the encoder to init
- * @funcs: callbacks for this encoder
- * @encoder_type: user visible type of the encoder
- * @name: printf style format string for the encoder name, or NULL for default name
- *
- * Initialises a preallocated encoder. Encoder should be subclassed as part of
- * driver encoder objects. At driver unload time drm_encoder_cleanup() should be
- * called from the driver's &drm_encoder_funcs.destroy hook.
- *
- * Returns:
- * Zero on success, error code on failure.
- */
-int drm_encoder_init(struct drm_device *dev,
-		     struct drm_encoder *encoder,
-		     const struct drm_encoder_funcs *funcs,
-		     int encoder_type, const char *name, ...)
+__printf(5, 0)
+static int __drm_encoder_init(struct drm_device *dev,
+			      struct drm_encoder *encoder,
+			      const struct drm_encoder_funcs *funcs,
+			      int encoder_type, const char *name, va_list ap)
 {
 	int ret;
 
@@ -125,11 +112,7 @@ int drm_encoder_init(struct drm_device *dev,
 	encoder->encoder_type = encoder_type;
 	encoder->funcs = funcs;
 	if (name) {
-		va_list ap;
-
-		va_start(ap, name);
 		encoder->name = kvasprintf(GFP_KERNEL, name, ap);
-		va_end(ap);
 	} else {
 		encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
 					  drm_encoder_enum_list[encoder_type].name,
@@ -150,6 +133,44 @@ out_put:
 
 	return ret;
 }
+
+/**
+ * drm_encoder_init - Init a preallocated encoder
+ * @dev: drm device
+ * @encoder: the encoder to init
+ * @funcs: callbacks for this encoder
+ * @encoder_type: user visible type of the encoder
+ * @name: printf style format string for the encoder name, or NULL for default name
+ *
+ * Initializes a preallocated encoder. Encoder should be subclassed as part of
+ * driver encoder objects. At driver unload time the driver's
+ * &drm_encoder_funcs.destroy hook should call drm_encoder_cleanup() and kfree()
+ * the encoder structure. The encoder structure should not be allocated with
+ * devm_kzalloc().
+ *
+ * Note: consider using drmm_encoder_alloc() instead of drm_encoder_init() to
+ * let the DRM managed resource infrastructure take care of cleanup and
+ * deallocation.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_encoder_init(struct drm_device *dev,
+		     struct drm_encoder *encoder,
+		     const struct drm_encoder_funcs *funcs,
+		     int encoder_type, const char *name, ...)
+{
+	va_list ap;
+	int ret;
+
+	WARN_ON(!funcs->destroy);
+
+	va_start(ap, name);
+	ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
+	va_end(ap);
+
+	return ret;
+}
 EXPORT_SYMBOL(drm_encoder_init);
 
 /**
@@ -181,6 +202,48 @@ void drm_encoder_cleanup(struct drm_encoder *encoder)
 }
 EXPORT_SYMBOL(drm_encoder_cleanup);
 
+static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr)
+{
+	struct drm_encoder *encoder = ptr;
+
+	if (WARN_ON(!encoder->dev))
+		return;
+
+	drm_encoder_cleanup(encoder);
+}
+
+void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset,
+			   const struct drm_encoder_funcs *funcs,
+			   int encoder_type, const char *name, ...)
+{
+	void *container;
+	struct drm_encoder *encoder;
+	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(-EINVAL);
+
+	encoder = container + offset;
+
+	va_start(ap, name);
+	ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
+	va_end(ap);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = drmm_add_action_or_reset(dev, drmm_encoder_alloc_release, encoder);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return container;
+}
+EXPORT_SYMBOL(__drmm_encoder_alloc);
+
 static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
 {
 	struct drm_connector *connector;
-- 
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