linux-kernel - [etnaviv-next v14 2/8] drm/etnaviv: Add constructor and destructor for the etnaviv_drm

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Message-Id: <20240519165321.2123356-3-sui.jingfeng@linux.dev>
Date: Mon, 20 May 2024 00:53:15 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: Lucas Stach <l.stach@...gutronix.de>
Cc: Russell King <linux+etnaviv@...linux.org.uk>,
	Christian Gmeiner <christian.gmeiner@...il.com>,
	linux-kernel@...r.kernel.org,
	etnaviv@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [etnaviv-next v14 2/8] drm/etnaviv: Add constructor and destructor for the etnaviv_drm_private structure

Because there are a lot of data members in the struct etnaviv_drm_private,
which are intended to be shared by all GPU cores. It can be lengthy and
daunting on error handling, the 'gem_lock' of struct etnaviv_drm_private
just be forgeten to destroy on driver leave.

Switch to use the dedicated helpers introduced, etnaviv_bind() and
etnaviv_unbind() gets simplified. Another potential benefit is that
we could put the struct drm_device into struct etnaviv_drm_private
in the future, which made them share the same life time.

Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
---
 drivers/gpu/drm/etnaviv/etnaviv_drv.c | 72 +++++++++++++++++----------
 1 file changed, 46 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 6500f3999c5f..22c78bc944c4 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -41,6 +41,45 @@ static struct device_node *etnaviv_of_first_available_node(void)
 	return NULL;
 }
 
+static struct etnaviv_drm_private *etnaviv_alloc_private(struct device *dev)
+{
+	struct etnaviv_drm_private *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return ERR_PTR(-ENOMEM);
+
+	xa_init_flags(&priv->active_contexts, XA_FLAGS_ALLOC);
+
+	mutex_init(&priv->gem_lock);
+	INIT_LIST_HEAD(&priv->gem_list);
+	priv->num_gpus = 0;
+	priv->shm_gfp_mask = GFP_HIGHUSER | __GFP_RETRY_MAYFAIL | __GFP_NOWARN;
+
+	priv->cmdbuf_suballoc = etnaviv_cmdbuf_suballoc_new(dev);
+	if (IS_ERR(priv->cmdbuf_suballoc)) {
+		kfree(priv);
+		dev_err(dev, "Failed to create cmdbuf suballocator\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	return priv;
+}
+
+static void etnaviv_free_private(struct etnaviv_drm_private *priv)
+{
+	if (!priv)
+		return;
+
+	mutex_destroy(&priv->gem_lock);
+
+	etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
+
+	xa_destroy(&priv->active_contexts);
+
+	kfree(priv);
+}
+
 static void load_gpu(struct drm_device *dev)
 {
 	struct etnaviv_drm_private *priv = dev->dev_private;
@@ -521,35 +560,21 @@ static int etnaviv_bind(struct device *dev)
 	if (IS_ERR(drm))
 		return PTR_ERR(drm);
 
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		dev_err(dev, "failed to allocate private data\n");
-		ret = -ENOMEM;
+	priv = etnaviv_alloc_private(dev);
+	if (IS_ERR(priv)) {
+		ret = PTR_ERR(priv);
 		goto out_put;
 	}
+
 	drm->dev_private = priv;
 
 	dma_set_max_seg_size(dev, SZ_2G);
 
-	xa_init_flags(&priv->active_contexts, XA_FLAGS_ALLOC);
-
-	mutex_init(&priv->gem_lock);
-	INIT_LIST_HEAD(&priv->gem_list);
-	priv->num_gpus = 0;
-	priv->shm_gfp_mask = GFP_HIGHUSER | __GFP_RETRY_MAYFAIL | __GFP_NOWARN;
-
-	priv->cmdbuf_suballoc = etnaviv_cmdbuf_suballoc_new(drm->dev);
-	if (IS_ERR(priv->cmdbuf_suballoc)) {
-		dev_err(drm->dev, "Failed to create cmdbuf suballocator\n");
-		ret = PTR_ERR(priv->cmdbuf_suballoc);
-		goto out_free_priv;
-	}
-
 	dev_set_drvdata(dev, drm);
 
 	ret = component_bind_all(dev, drm);
 	if (ret < 0)
-		goto out_destroy_suballoc;
+		goto out_free_priv;
 
 	load_gpu(drm);
 
@@ -561,10 +586,8 @@ static int etnaviv_bind(struct device *dev)
 
 out_unbind:
 	component_unbind_all(dev, drm);
-out_destroy_suballoc:
-	etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 out_free_priv:
-	kfree(priv);
+	etnaviv_free_private(priv);
 out_put:
 	drm_dev_put(drm);
 
@@ -580,12 +603,9 @@ static void etnaviv_unbind(struct device *dev)
 
 	component_unbind_all(dev, drm);
 
-	etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
-
-	xa_destroy(&priv->active_contexts);
+	etnaviv_free_private(priv);
 
 	drm->dev_private = NULL;
-	kfree(priv);
 
 	drm_dev_put(drm);
 }
-- 
2.34.1