linux-kernel - Re: [PATCH v6 04/49] soc: fsl: qe: introduce qe

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Message-ID: <a80b9c70-f9f2-0f76-15d0-d7a1c926f485@csgroup.eu>
Date:   Tue, 19 Jan 2021 18:33:20 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Scott Wood <oss@...error.net>, Timur Tabi <timur@...nel.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>
Subject: Re: [PATCH v6 04/49] soc: fsl: qe: introduce qe_io{read,write}*
 wrappers

Hi Rasmus,

Le 28/11/2019 à 15:55, Rasmus Villemoes a écrit :
> The QUICC engine drivers use the powerpc-specific out_be32() etc. In
> order to allow those drivers to build for other architectures, those
> must be replaced by iowrite32be(). However, on powerpc, out_be32() is
> a simple inline function while iowrite32be() is out-of-line. So in
> order not to introduce a performance regression on powerpc when making
> the drivers work on other architectures, introduce qe_io* helpers.
> 
> Also define the qe_{clr,set,clrset}bits* helpers in terms of these new
> macros.

Since commit https://github.com/linuxppc/linux/commit/894fa235eb4ca0bfa692dbe4932c2f940cdc8c1e 
ioread/iowrite wrappers are also inlined on PPC32, so this commit can now be reverted.

Christophe

> 
> Reviewed-by: Timur Tabi <timur@...nel.org>
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>   include/soc/fsl/qe/qe.h | 34 +++++++++++++++++++++++++---------
>   1 file changed, 25 insertions(+), 9 deletions(-)
> 
> diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h
> index a1aa4eb28f0c..9cac04c692fd 100644
> --- a/include/soc/fsl/qe/qe.h
> +++ b/include/soc/fsl/qe/qe.h
> @@ -241,21 +241,37 @@ static inline int qe_alive_during_sleep(void)
>   #define qe_muram_offset cpm_muram_offset
>   #define qe_muram_dma cpm_muram_dma
>   
> -#define qe_setbits_be32(_addr, _v) iowrite32be(ioread32be(_addr) |  (_v), (_addr))
> -#define qe_clrbits_be32(_addr, _v) iowrite32be(ioread32be(_addr) & ~(_v), (_addr))
> +#ifdef CONFIG_PPC32
> +#define qe_iowrite8(val, addr)     out_8(addr, val)
> +#define qe_iowrite16be(val, addr)  out_be16(addr, val)
> +#define qe_iowrite32be(val, addr)  out_be32(addr, val)
> +#define qe_ioread8(addr)           in_8(addr)
> +#define qe_ioread16be(addr)        in_be16(addr)
> +#define qe_ioread32be(addr)        in_be32(addr)
> +#else
> +#define qe_iowrite8(val, addr)     iowrite8(val, addr)
> +#define qe_iowrite16be(val, addr)  iowrite16be(val, addr)
> +#define qe_iowrite32be(val, addr)  iowrite32be(val, addr)
> +#define qe_ioread8(addr)           ioread8(addr)
> +#define qe_ioread16be(addr)        ioread16be(addr)
> +#define qe_ioread32be(addr)        ioread32be(addr)
> +#endif
> +
> +#define qe_setbits_be32(_addr, _v) qe_iowrite32be(qe_ioread32be(_addr) |  (_v), (_addr))
> +#define qe_clrbits_be32(_addr, _v) qe_iowrite32be(qe_ioread32be(_addr) & ~(_v), (_addr))
>   
> -#define qe_setbits_be16(_addr, _v) iowrite16be(ioread16be(_addr) |  (_v), (_addr))
> -#define qe_clrbits_be16(_addr, _v) iowrite16be(ioread16be(_addr) & ~(_v), (_addr))
> +#define qe_setbits_be16(_addr, _v) qe_iowrite16be(qe_ioread16be(_addr) |  (_v), (_addr))
> +#define qe_clrbits_be16(_addr, _v) qe_iowrite16be(qe_ioread16be(_addr) & ~(_v), (_addr))
>   
> -#define qe_setbits_8(_addr, _v) iowrite8(ioread8(_addr) |  (_v), (_addr))
> -#define qe_clrbits_8(_addr, _v) iowrite8(ioread8(_addr) & ~(_v), (_addr))
> +#define qe_setbits_8(_addr, _v) qe_iowrite8(qe_ioread8(_addr) |  (_v), (_addr))
> +#define qe_clrbits_8(_addr, _v) qe_iowrite8(qe_ioread8(_addr) & ~(_v), (_addr))
>   
>   #define qe_clrsetbits_be32(addr, clear, set) \
> -	iowrite32be((ioread32be(addr) & ~(clear)) | (set), (addr))
> +	qe_iowrite32be((qe_ioread32be(addr) & ~(clear)) | (set), (addr))
>   #define qe_clrsetbits_be16(addr, clear, set) \
> -	iowrite16be((ioread16be(addr) & ~(clear)) | (set), (addr))
> +	qe_iowrite16be((qe_ioread16be(addr) & ~(clear)) | (set), (addr))
>   #define qe_clrsetbits_8(addr, clear, set) \
> -	iowrite8((ioread8(addr) & ~(clear)) | (set), (addr))
> +	qe_iowrite8((qe_ioread8(addr) & ~(clear)) | (set), (addr))
>   
>   /* Structure that defines QE firmware binary files.
>    *
>