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From: Dave Airlie <airlied@gmail.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH 05/15] drm/mode: move framebuffer reference into object.
Date: Fri, 15 Apr 2016 15:10:36 +1000	[thread overview]
Message-ID: <1460697046-23781-6-git-send-email-airlied@gmail.com> (raw)
In-Reply-To: <1460697046-23781-1-git-send-email-airlied@gmail.com>

From: Dave Airlie <airlied@redhat.com>

This is the initial code to add references to some mode objects.
In the future we need to start reference counting connectors so
firstly I want to reorganise the code so the framebuffer ref counting
uses the same paths.

This patch shouldn't change any functionality, just moves the kref.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/drm_crtc.c | 72 ++++++++++++++++++++++++----------------------
 include/drm/drm_crtc.h     | 20 ++++++++++---
 2 files changed, 54 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 8616737..75a45e9 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -275,7 +275,8 @@ EXPORT_SYMBOL(drm_get_format_name);
 static int drm_mode_object_get_reg(struct drm_device *dev,
 				   struct drm_mode_object *obj,
 				   uint32_t obj_type,
-				   bool register_obj)
+				   bool register_obj,
+				   void (*obj_free_cb)(struct kref *kref))
 {
 	int ret;
 
@@ -288,6 +289,10 @@ static int drm_mode_object_get_reg(struct drm_device *dev,
 		 */
 		obj->id = ret;
 		obj->type = obj_type;
+		if (obj_free_cb) {
+			obj->free_cb = obj_free_cb;
+			kref_init(&obj->refcount);
+		}
 	}
 	mutex_unlock(&dev->mode_config.idr_mutex);
 
@@ -311,7 +316,7 @@ static int drm_mode_object_get_reg(struct drm_device *dev,
 int drm_mode_object_get(struct drm_device *dev,
 			struct drm_mode_object *obj, uint32_t obj_type)
 {
-	return drm_mode_object_get_reg(dev, obj, obj_type, true);
+	return drm_mode_object_get_reg(dev, obj, obj_type, true, NULL);
 }
 
 static void drm_mode_object_register(struct drm_device *dev,
@@ -389,10 +394,35 @@ struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_mode_object_find);
 
+void drm_mode_object_unreference(struct drm_mode_object *obj)
+{
+	if (obj->free_cb) {
+		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
+		kref_put(&obj->refcount, obj->free_cb);
+	}
+}
+EXPORT_SYMBOL(drm_mode_object_unreference);
+
+/**
+ * drm_mode_object_reference - incr the fb refcnt
+ * @obj: mode_object
+ *
+ * This function operates only on refcounted objects.
+ * This functions increments the object's refcount.
+ */
+void drm_mode_object_reference(struct drm_mode_object *obj)
+{
+	if (obj->free_cb) {
+		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
+		kref_get(&obj->refcount);
+	}
+}
+EXPORT_SYMBOL(drm_mode_object_reference);
+
 static void drm_framebuffer_free(struct kref *kref)
 {
 	struct drm_framebuffer *fb =
-			container_of(kref, struct drm_framebuffer, refcount);
+			container_of(kref, struct drm_framebuffer, base.refcount);
 	struct drm_device *dev = fb->dev;
 
 	/*
@@ -430,12 +460,12 @@ int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
 	int ret;
 
 	mutex_lock(&dev->mode_config.fb_lock);
-	kref_init(&fb->refcount);
 	INIT_LIST_HEAD(&fb->filp_head);
 	fb->dev = dev;
 	fb->funcs = funcs;
 
-	ret = drm_mode_object_get(dev, &fb->base, DRM_MODE_OBJECT_FB);
+	ret = drm_mode_object_get_reg(dev, &fb->base, DRM_MODE_OBJECT_FB,
+				      true, drm_framebuffer_free);
 	if (ret)
 		goto out;
 
@@ -482,7 +512,7 @@ struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
 	mutex_lock(&dev->mode_config.fb_lock);
 	fb = __drm_framebuffer_lookup(dev, id);
 	if (fb) {
-		if (!kref_get_unless_zero(&fb->refcount))
+		if (!kref_get_unless_zero(&fb->base.refcount))
 			fb = NULL;
 	}
 	mutex_unlock(&dev->mode_config.fb_lock);
@@ -492,32 +522,6 @@ struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
 EXPORT_SYMBOL(drm_framebuffer_lookup);
 
 /**
- * drm_framebuffer_unreference - unref a framebuffer
- * @fb: framebuffer to unref
- *
- * This functions decrements the fb's refcount and frees it if it drops to zero.
- */
-void drm_framebuffer_unreference(struct drm_framebuffer *fb)
-{
-	DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
-	kref_put(&fb->refcount, drm_framebuffer_free);
-}
-EXPORT_SYMBOL(drm_framebuffer_unreference);
-
-/**
- * drm_framebuffer_reference - incr the fb refcnt
- * @fb: framebuffer
- *
- * This functions increments the fb's refcount.
- */
-void drm_framebuffer_reference(struct drm_framebuffer *fb)
-{
-	DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
-	kref_get(&fb->refcount);
-}
-EXPORT_SYMBOL(drm_framebuffer_reference);
-
-/**
  * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
  * @fb: fb to unregister
  *
@@ -902,7 +906,7 @@ int drm_connector_init(struct drm_device *dev,
 
 	drm_modeset_lock_all(dev);
 
-	ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false);
+	ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false, NULL);
 	if (ret)
 		goto out_unlock;
 
@@ -5922,7 +5926,7 @@ void drm_mode_config_cleanup(struct drm_device *dev)
 	 */
 	WARN_ON(!list_empty(&dev->mode_config.fb_list));
 	list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
-		drm_framebuffer_free(&fb->refcount);
+		drm_framebuffer_free(&fb->base.refcount);
 	}
 
 	list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 99a12f0..576faf4 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -59,6 +59,8 @@ struct drm_mode_object {
 	uint32_t id;
 	uint32_t type;
 	struct drm_object_properties *properties;
+	struct kref refcount;
+	void (*free_cb)(struct kref *kref);
 };
 
 #define DRM_OBJECT_MAX_PROPERTY 24
@@ -233,8 +235,8 @@ struct drm_framebuffer {
 	 * should be deferred.  In cases like this, the driver would like to
 	 * hold a ref to the fb even though it has already been removed from
 	 * userspace perspective.
+	 * The refcount is stored inside the mode object.
 	 */
-	struct kref refcount;
 	/*
 	 * Place on the dev->mode_config.fb_list, access protected by
 	 * dev->mode_config.fb_lock.
@@ -2386,8 +2388,6 @@ extern int drm_framebuffer_init(struct drm_device *dev,
 				const struct drm_framebuffer_funcs *funcs);
 extern struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
 						      uint32_t id);
-extern void drm_framebuffer_unreference(struct drm_framebuffer *fb);
-extern void drm_framebuffer_reference(struct drm_framebuffer *fb);
 extern void drm_framebuffer_remove(struct drm_framebuffer *fb);
 extern void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
 extern void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);
@@ -2445,6 +2445,8 @@ extern int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
 					 int gamma_size);
 extern struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 		uint32_t id, uint32_t type);
+void drm_mode_object_reference(struct drm_mode_object *obj);
+void drm_mode_object_unreference(struct drm_mode_object *obj);
 
 /* IOCTLs */
 extern int drm_mode_getresources(struct drm_device *dev,
@@ -2608,9 +2610,19 @@ static inline uint32_t drm_color_lut_extract(uint32_t user_input,
 	return clamp_val(val, 0, max);
 }
 
+static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
+{
+	drm_mode_object_reference(&fb->base);
+}
+
+static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
+{
+	drm_mode_object_unreference(&fb->base);
+}
+
 static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb)
 {
-	return atomic_read(&fb->refcount.refcount);
+	return atomic_read(&fb->base.refcount.refcount);
 }
 
 /* Plane list iterator for legacy (overlay only) planes. */
-- 
2.5.5

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  parent reply	other threads:[~2016-04-15  5:10 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-15  5:10 drm reference counter connectors and fix lifetimes Dave Airlie
2016-04-15  5:10 ` [PATCH 01/15] drm/mode: rework drm_mode_object_put to drm_mode_object_unregister Dave Airlie
2016-04-21  8:03   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 02/15] drm/mode: move framebuffer_free up above framebuffer_init Dave Airlie
2016-04-21  8:03   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 03/15] drm/modes: drop __drm_framebuffer_unregister Dave Airlie
2016-04-21  8:05   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 04/15] drm/mode: introduce wrapper to read framebuffer refcount Dave Airlie
2016-04-21  8:07   ` Daniel Vetter
2016-04-15  5:10 ` Dave Airlie [this message]
2016-04-21  8:12   ` [PATCH 05/15] drm/mode: move framebuffer reference into object Daniel Vetter
2016-04-15  5:10 ` [PATCH 06/15] drm/mode: use _object_find to find framebuffers Dave Airlie
2016-04-21  8:14   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 07/15] drm/mode: reduce scope of fb_lock in framebuffer init Dave Airlie
2016-04-21  8:54   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 08/15] drm/mode: reduce lock hold in addfb2 Dave Airlie
2016-04-21  8:59   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 09/15] drm/modes: move reference taking into object lookup Dave Airlie
2016-04-21  9:05   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 10/15] drm/modes: reduce fb_lock to just protecting lists Dave Airlie
2016-04-21  9:06   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 11/15] drm/modes: stop handling framebuffer special Dave Airlie
2016-04-21  9:06   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 12/15] drm/modes: add connector reference counting Dave Airlie
2016-04-22  9:24   ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 13/15] drm: take references to connectors used in a modeset Dave Airlie
2016-04-22  8:49   ` Daniel Vetter
2016-04-27  1:44     ` Dave Airlie
2016-04-15  5:10 ` [PATCH 14/15] drm/i915/mst: use reference counted connectors Dave Airlie
2016-04-22  9:03   ` Daniel Vetter
2016-04-27  1:54     ` Dave Airlie
2016-04-27  6:29       ` Daniel Vetter
2016-04-15  5:10 ` [PATCH 15/15] drm/radeon/dp_mst: use connector ref counting Dave Airlie
2016-04-22  9:04   ` Daniel Vetter
2016-04-21  9:08 ` drm reference counter connectors and fix lifetimes Daniel Vetter

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