linux-kernel - Re: [PATCH 2/4] drm/radeon: Remove unused radeon_doorbell

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Message-ID: <ab85b3c9-46cc-4148-9de5-dcaabea130ea@wanadoo.fr>
Date: Fri, 18 Apr 2025 07:52:27 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: linux@...blig.org, alexander.deucher@....com, harry.wentland@....com,
 sunpeng.li@....com, siqueira@...lia.com, christian.koenig@....com
Cc: airlied@...il.com, simona@...ll.ch, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] drm/radeon: Remove unused radeon_doorbell_free

Le 18/04/2025 à 02:21, linux@...blig.org a écrit :
> From: "Dr. David Alan Gilbert" <linux@...blig.org>
> 
> radeon_doorbell_free() was added in 2013 by
> commit 75efdee11b5d ("drm/radeon: implement simple doorbell page
> allocator")
> but never used.

Hi,

I think than instead of being removed, it should be used in the error 
handling path of cik_init() and in cik_fini().

CJ

> 
> Remove it.
> 
> Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> ---
>   drivers/gpu/drm/radeon/radeon.h        |  1 -
>   drivers/gpu/drm/radeon/radeon_device.c | 14 --------------
>   2 files changed, 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index 8605c074d9f7..58111fdf520d 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -686,7 +686,6 @@ struct radeon_doorbell {
>   };
>   
>   int radeon_doorbell_get(struct radeon_device *rdev, u32 *page);
> -void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell);
>   
>   /*
>    * IRQS.
> diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
> index bbd39348a7ab..4127ffb4bb6f 100644
> --- a/drivers/gpu/drm/radeon/radeon_device.c
> +++ b/drivers/gpu/drm/radeon/radeon_device.c
> @@ -392,20 +392,6 @@ int radeon_doorbell_get(struct radeon_device *rdev, u32 *doorbell)
>   	}
>   }
>   
> -/**
> - * radeon_doorbell_free - Free a doorbell entry
> - *
> - * @rdev: radeon_device pointer
> - * @doorbell: doorbell index
> - *
> - * Free a doorbell allocated for use by the driver (all asics)
> - */
> -void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell)
> -{
> -	if (doorbell < rdev->doorbell.num_doorbells)
> -		__clear_bit(doorbell, rdev->doorbell.used);
> -}
> -
>   /*
>    * radeon_wb_*()
>    * Writeback is the method by which the GPU updates special pages