linux-kernel - Re: [PATCH 1/1] video: Handle HAS

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Message-ID: <a7a1b5b7-9d98-4c3f-a5c4-36c692c12418@gmx.de>
Date: Thu, 1 Aug 2024 22:45:32 +0200
From: Helge Deller <deller@....de>
To: Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 Arnd Bergmann <arnd@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] video: Handle HAS_IOPORT dependencies

On 4/10/24 16:23, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> compile time. We thus need to #ifdef functions and their callsites which
> unconditionally use these I/O accessors. In the include/video/vga.h
> these are conveniently all those functions with the vga_io_* prefix.
>
> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>

I've applied this patch now to the for-next fbdev git tree.

Please let me know if you prefer another patch....

Thanks!
Helge


> ---
> Note: This patch does not depend any not-yet-mainline HAS_IOPORT changes
> and may be merged via subsystem specific trees at your earliest
> convenience.
>
>   include/video/vga.h | 35 +++++++++++++++++++++++++----------
>   1 file changed, 25 insertions(+), 10 deletions(-)
>
> diff --git a/include/video/vga.h b/include/video/vga.h
> index 947c0abd04ef..ed89295941c4 100644
> --- a/include/video/vga.h
> +++ b/include/video/vga.h
> @@ -201,6 +201,7 @@ extern int restore_vga(struct vgastate *state);
>    * generic VGA port read/write
>    */
>
> +#ifdef CONFIG_HAS_IOPORT
>   static inline unsigned char vga_io_r (unsigned short port)
>   {
>   	return inb_p(port);
> @@ -210,12 +211,12 @@ static inline void vga_io_w (unsigned short port, unsigned char val)
>   {
>   	outb_p(val, port);
>   }
> -
>   static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
>   				  unsigned char val)
>   {
>   	outw(VGA_OUT16VAL (val, reg), port);
>   }
> +#endif /* CONFIG_HAS_IOPORT */
>
>   static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
>   {
> @@ -235,28 +236,34 @@ static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
>
>   static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
>   {
> -	if (regbase)
> -		return vga_mm_r (regbase, port);
> -	else
> +#ifdef CONFIG_HAS_IOPORT
> +	if (!regbase)
>   		return vga_io_r (port);
> +	else
> +#endif /* CONFIG_HAS_IOPORT */
> +		return vga_mm_r (regbase, port);
>   }
>
>   static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
>   {
> -	if (regbase)
> -		vga_mm_w (regbase, port, val);
> -	else
> +#ifdef CONFIG_HAS_IOPORT
> +	if (!regbase)
>   		vga_io_w (port, val);
> +	else
> +#endif /* CONFIG_HAS_IOPORT */
> +		vga_mm_w (regbase, port, val);
>   }
>
>
>   static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
>   			       unsigned char reg, unsigned char val)
>   {
> -	if (regbase)
> -		vga_mm_w_fast (regbase, port, reg, val);
> -	else
> +#ifdef CONFIG_HAS_IOPORT
> +	if (!regbase)
>   		vga_io_w_fast (port, reg, val);
> +	else
> +#endif /* CONFIG_HAS_IOPORT */
> +		vga_mm_w_fast (regbase, port, reg, val);
>   }
>
>
> @@ -280,6 +287,7 @@ static inline void vga_wcrt (void __iomem *regbase, unsigned char reg, unsigned
>   #endif /* VGA_OUTW_WRITE */
>   }
>
> +#ifdef CONFIG_HAS_IOPORT
>   static inline unsigned char vga_io_rcrt (unsigned char reg)
>   {
>           vga_io_w (VGA_CRT_IC, reg);
> @@ -295,6 +303,7 @@ static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
>           vga_io_w (VGA_CRT_DC, val);
>   #endif /* VGA_OUTW_WRITE */
>   }
> +#endif /* CONFIG_HAS_IOPORT */
>
>   static inline unsigned char vga_mm_rcrt (void __iomem *regbase, unsigned char reg)
>   {
> @@ -333,6 +342,7 @@ static inline void vga_wseq (void __iomem *regbase, unsigned char reg, unsigned
>   #endif /* VGA_OUTW_WRITE */
>   }
>
> +#ifdef CONFIG_HAS_IOPORT
>   static inline unsigned char vga_io_rseq (unsigned char reg)
>   {
>           vga_io_w (VGA_SEQ_I, reg);
> @@ -348,6 +358,7 @@ static inline void vga_io_wseq (unsigned char reg, unsigned char val)
>           vga_io_w (VGA_SEQ_D, val);
>   #endif /* VGA_OUTW_WRITE */
>   }
> +#endif /* CONFIG_HAS_IOPORT */
>
>   static inline unsigned char vga_mm_rseq (void __iomem *regbase, unsigned char reg)
>   {
> @@ -385,6 +396,7 @@ static inline void vga_wgfx (void __iomem *regbase, unsigned char reg, unsigned
>   #endif /* VGA_OUTW_WRITE */
>   }
>
> +#ifdef CONFIG_HAS_IOPORT
>   static inline unsigned char vga_io_rgfx (unsigned char reg)
>   {
>           vga_io_w (VGA_GFX_I, reg);
> @@ -400,6 +412,7 @@ static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
>           vga_io_w (VGA_GFX_D, val);
>   #endif /* VGA_OUTW_WRITE */
>   }
> +#endif /* CONFIG_HAS_IOPORT */
>
>   static inline unsigned char vga_mm_rgfx (void __iomem *regbase, unsigned char reg)
>   {
> @@ -434,6 +447,7 @@ static inline void vga_wattr (void __iomem *regbase, unsigned char reg, unsigned
>           vga_w (regbase, VGA_ATT_W, val);
>   }
>
> +#ifdef CONFIG_HAS_IOPORT
>   static inline unsigned char vga_io_rattr (unsigned char reg)
>   {
>           vga_io_w (VGA_ATT_IW, reg);
> @@ -445,6 +459,7 @@ static inline void vga_io_wattr (unsigned char reg, unsigned char val)
>           vga_io_w (VGA_ATT_IW, reg);
>           vga_io_w (VGA_ATT_W, val);
>   }
> +#endif /* CONFIG_HAS_IOPORT */
>
>   static inline unsigned char vga_mm_rattr (void __iomem *regbase, unsigned char reg)
>   {