linux-kernel - Re: [PATCH v10 04/11] drm/etnaviv: Add helpers for private data construction and destruction

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Message-ID: <cba8ebe734aed53e74ddee2242526d10338cbafb.camel@pengutronix.de>
Date:   Wed, 21 Jun 2023 11:22:30 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Sui Jingfeng <18949883232@....com>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Sui Jingfeng <suijingfeng@...ngson.cn>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        etnaviv@...ts.freedesktop.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v10 04/11] drm/etnaviv: Add helpers for private data
 construction and destruction

Am Dienstag, dem 20.06.2023 um 17:47 +0800 schrieb Sui Jingfeng:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
> 
> There are numerous members in the struct etnaviv_drm_private, which are
> shared by all GPU core. This patch introduces two dedicated functions for
> the construction and destruction of the instances of this structure.
> The goal is to keep its members from leaking to the outside. The code
> needed for error handling can also be simplified.
> 
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Christian Gmeiner <christian.gmeiner@...il.com>
> Cc: Philipp Zabel <p.zabel@...gutronix.de>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
>  drivers/gpu/drm/etnaviv/etnaviv_drv.c | 73 +++++++++++++++++----------
>  drivers/gpu/drm/etnaviv/etnaviv_drv.h |  1 +
>  2 files changed, 47 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> index cec005035d0e..6a048be02857 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> @@ -24,9 +24,47 @@
>  #include "etnaviv_perfmon.h"
>  
>  /*
> - * DRM operations:
> + * etnaviv private data construction and destructions:
>   */
> +static struct etnaviv_drm_private *
> +etnaviv_alloc_private(struct device *dev, struct drm_device *drm)
> +{
> +	struct etnaviv_drm_private *priv;
> +
> +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return ERR_PTR(-ENOMEM);
> +
> +	priv->drm = drm;

That's an unrelated change that you rely on in later patches. If this
is needed at all it needs to be in a separate patch with a explanation
on why it is needed.

Regards,
Lucas

> +
> +	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;
> +
> +	etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
> +
> +	xa_destroy(&priv->active_contexts);
> +
> +	kfree(priv);
> +}
>  
>  static void load_gpu(struct drm_device *dev)
>  {
> @@ -511,35 +549,21 @@ 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, drm);
> +	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);
>  
> @@ -551,10 +575,8 @@ 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);
>  
> @@ -570,12 +592,9 @@ 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);
>  }
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.h b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> index b3eb1662e90c..e58f82e698de 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> @@ -35,6 +35,7 @@ struct etnaviv_file_private {
>  };
>  
>  struct etnaviv_drm_private {
> +	struct drm_device *drm;
>  	int num_gpus;
>  	struct etnaviv_gpu *gpu[ETNA_MAX_PIPES];
>  	gfp_t shm_gfp_mask;