linux-kernel - Re: [PATCH v3 1/3] drm/privacy_screen: Add drvdata in drm_privacy

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Message-ID: <e98a06d9-f8e0-bfa8-760f-5d3cc793f2b2@redhat.com>
Date:   Tue, 21 Dec 2021 19:51:02 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Rajat Jain <rajatja@...gle.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Benson Leung <bleung@...omium.org>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Mark Gross <markgross@...nel.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, gwendal@...gle.com,
        seanpaul@...gle.com, marcheu@...gle.com, dtor@...gle.com
Cc:     rajatxjain@...il.com
Subject: Re: [PATCH v3 1/3] drm/privacy_screen: Add drvdata in
 drm_privacy_screen

Hi,

On 12/20/21 23:28, Rajat Jain wrote:
> Allow a privacy screen provider to stash its private data pointer in the
> drm_privacy_screen, and update the drm_privacy_screen_register() call to
> accept that. Also introduce a *_get_drvdata() so that it can retrieved
> back when needed.
> 
> This also touches the IBM Thinkpad platform driver, the only user of
> privacy screen today, to pass NULL for now to the updated API.
> 
> Signed-off-by: Rajat Jain <rajatja@...gle.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
> v3: Initial version. Came up due to review comments on v2 of other patches.
> v2: No v2
> v1: No v1
> 
>  drivers/gpu/drm/drm_privacy_screen.c    |  5 ++++-
>  drivers/platform/x86/thinkpad_acpi.c    |  2 +-
>  include/drm/drm_privacy_screen_driver.h | 13 ++++++++++++-
>  3 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_privacy_screen.c b/drivers/gpu/drm/drm_privacy_screen.c
> index beaf99e9120a..03b149cc455b 100644
> --- a/drivers/gpu/drm/drm_privacy_screen.c
> +++ b/drivers/gpu/drm/drm_privacy_screen.c
> @@ -387,7 +387,8 @@ static void drm_privacy_screen_device_release(struct device *dev)
>   * * An ERR_PTR(errno) on failure.
>   */
>  struct drm_privacy_screen *drm_privacy_screen_register(
> -	struct device *parent, const struct drm_privacy_screen_ops *ops)
> +	struct device *parent, const struct drm_privacy_screen_ops *ops,
> +	void *data)
>  {
>  	struct drm_privacy_screen *priv;
>  	int ret;
> @@ -404,6 +405,7 @@ struct drm_privacy_screen *drm_privacy_screen_register(
>  	priv->dev.parent = parent;
>  	priv->dev.release = drm_privacy_screen_device_release;
>  	dev_set_name(&priv->dev, "privacy_screen-%s", dev_name(parent));
> +	priv->drvdata = data;
>  	priv->ops = ops;
>  
>  	priv->ops->get_hw_state(priv);
> @@ -439,6 +441,7 @@ void drm_privacy_screen_unregister(struct drm_privacy_screen *priv)
>  	mutex_unlock(&drm_privacy_screen_devs_lock);
>  
>  	mutex_lock(&priv->lock);
> +	priv->drvdata = NULL;
>  	priv->ops = NULL;
>  	mutex_unlock(&priv->lock);
>  
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 341655d711ce..ccbfda2b0095 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -9782,7 +9782,7 @@ static int tpacpi_lcdshadow_init(struct ibm_init_struct *iibm)
>  		return 0;
>  
>  	lcdshadow_dev = drm_privacy_screen_register(&tpacpi_pdev->dev,
> -						    &lcdshadow_ops);
> +						    &lcdshadow_ops, NULL);
>  	if (IS_ERR(lcdshadow_dev))
>  		return PTR_ERR(lcdshadow_dev);
>  
> diff --git a/include/drm/drm_privacy_screen_driver.h b/include/drm/drm_privacy_screen_driver.h
> index 24591b607675..4ef246d5706f 100644
> --- a/include/drm/drm_privacy_screen_driver.h
> +++ b/include/drm/drm_privacy_screen_driver.h
> @@ -73,10 +73,21 @@ struct drm_privacy_screen {
>  	 * for more info.
>  	 */
>  	enum drm_privacy_screen_status hw_state;
> +	/**
> +	 * @drvdata: Private data owned by the privacy screen provider
> +	 */
> +	void *drvdata;
>  };
>  
> +static inline
> +void *drm_privacy_screen_get_drvdata(struct drm_privacy_screen *priv)
> +{
> +	return priv->drvdata;
> +}
> +
>  struct drm_privacy_screen *drm_privacy_screen_register(
> -	struct device *parent, const struct drm_privacy_screen_ops *ops);
> +	struct device *parent, const struct drm_privacy_screen_ops *ops,
> +	void *data);
>  void drm_privacy_screen_unregister(struct drm_privacy_screen *priv);
>  
>  void drm_privacy_screen_call_notifier_chain(struct drm_privacy_screen *priv);
>