linux-kernel - Re: [PATCH v2 1/2] drm/aperture: Move conflicting fbdev frame buffer removal to a helper

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Date:   Tue, 2 Nov 2021 10:13:00 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     Neal Gompa <ngompa13@...il.com>,
        Peter Robinson <pbrobinson@...il.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 1/2] drm/aperture: Move conflicting fbdev frame buffer
 removal to a helper



Am 25.10.21 um 09:57 schrieb Javier Martinez Canillas:
> The logic to remove the conflicting frame buffers for fbdev devices that
> use a given memory range is only compiled if CONFIG_FB option is enabled.
> 
> But having an ifdefery in drm_aperture_remove_conflicting_framebuffers()
> makes the function harder to extend. Move the logic into its own helper.
> 
> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
> 
> (no changes since v1)
> 
>   drivers/gpu/drm/drm_aperture.c | 39 ++++++++++++++++++++++------------
>   1 file changed, 26 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_aperture.c b/drivers/gpu/drm/drm_aperture.c
> index 74bd4a76b253..1a8ed0c616d6 100644
> --- a/drivers/gpu/drm/drm_aperture.c
> +++ b/drivers/gpu/drm/drm_aperture.c
> @@ -273,6 +273,30 @@ static void drm_aperture_detach_drivers(resource_size_t base, resource_size_t si
>   	mutex_unlock(&drm_apertures_lock);
>   }
>   
> +static int drm_aperture_remove_conflicting_fbdev_framebuffers(resource_size_t base,
> +							      resource_size_t size, bool primary,
> +							      const struct drm_driver *req_driver)
> +{
> +#if IS_REACHABLE(CONFIG_FB)
> +	struct apertures_struct *a;
> +	int ret;
> +
> +	a = alloc_apertures(1);
> +	if (!a)
> +		return -ENOMEM;
> +
> +	a->ranges[0].base = base;
> +	a->ranges[0].size = size;
> +
> +	ret = remove_conflicting_framebuffers(a, req_driver->name, primary);
> +	kfree(a);
> +
> +	if (ret)
> +		return ret;
> +#endif
> +	return 0;
> +}
> +
>   /**
>    * drm_aperture_remove_conflicting_framebuffers - remove existing framebuffers in the given range
>    * @base: the aperture's base address in physical memory
> @@ -289,23 +313,12 @@ static void drm_aperture_detach_drivers(resource_size_t base, resource_size_t si
>   int drm_aperture_remove_conflicting_framebuffers(resource_size_t base, resource_size_t size,
>   						 bool primary, const struct drm_driver *req_driver)
>   {
> -#if IS_REACHABLE(CONFIG_FB)
> -	struct apertures_struct *a;
>   	int ret;
>   
> -	a = alloc_apertures(1);
> -	if (!a)
> -		return -ENOMEM;
> -
> -	a->ranges[0].base = base;
> -	a->ranges[0].size = size;
> -
> -	ret = remove_conflicting_framebuffers(a, req_driver->name, primary);
> -	kfree(a);
> -
> +	ret = drm_aperture_remove_conflicting_fbdev_framebuffers(base, size, primary,
> +								 req_driver);
>   	if (ret)
>   		return ret;
> -#endif
>   
>   	drm_aperture_detach_drivers(base, size);
>   
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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