New subject: [PATCH 2/4] drm/simple_kms_helper: add drmm_simple_encoder_alloc()

26 Aug 2020

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
---
 drivers/gpu/drm/drm_encoder.c | 104 ++++++++++++++++++++++++++--------
 include/drm/drm_encoder.h     |  30 ++++++++++
 2 files changed, 111 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index e555281f43d4..0f9b69d22057 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 +92,10 @@ 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, ...)
+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 +111,7 @@ 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 +132,38 @@ int drm_encoder_init(struct drm_device *dev,
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 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, ...)
+{
+	va_list ap;
+	int ret;
+
+	if (name)
+		va_start(ap, name);
+	ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
+	if (name)
+		va_end(ap);
+
+	return ret;
+}
 EXPORT_SYMBOL(drm_encoder_init);
/**
@@ -181,6 +195,50 @@ 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;
+
+	if (name)
+		va_start(ap, name);
+	ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
+	if (name)
+		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;
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index a60f5f1555ac..4ecad1260ff7 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -195,6 +195,36 @@ int drm_encoder_init(struct drm_device *dev,
    	     const struct drm_encoder_funcs *funcs,
    	     int encoder_type, const char *name, ...);
+__printf(6, 7)
+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, ...);
+
+/**
+ * drmm_encoder_alloc - Allocate and initialize an encoder
+ * @dev: drm device
+ * @type: the type of the struct which contains struct &drm_encoder
+ * @member: the name of the &drm_encoder within @type.
+ * @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
+ *
+ * Allocates and initializes an encoder. Encoder should be subclassed as part of
+ * driver encoder objects. Cleanup is automatically handled through registering
+ * drm_encoder_cleanup() with drmm_add_action().
+ *
+ * The @drm_encoder_funcs.destroy hook must be NULL.
+ *
+ * Returns:
+ * Pointer to new encoder, or ERR_PTR on failure.
+ */
+#define drmm_encoder_alloc(dev, type, member, funcs, encoder_type, name, ...) \
+	((type *)__drmm_encoder_alloc(dev, sizeof(type), \
+				      offsetof(type, member), funcs, \
+				      encoder_type, name, ##__VA_ARGS__))
+
 /**
  * drm_encoder_index - find the index of a registered encoder
  * @encoder: encoder to find index for
-- 
2.20.1


    

[PATCH 1/4] drm: add drmm_encoder_alloc()