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

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Date:   Tue, 19 Jan 2021 11:46:16 -0600
From:   Li Yang <leoyang.li@....com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Timur Tabi <timur@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Scott Wood <oss@...error.net>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Qiang Zhao <qiang.zhao@....com>
Subject: Re: [PATCH v6 04/49] soc: fsl: qe: introduce qe_io{read,write}* wrappers

On Tue, Jan 19, 2021 at 11:35 AM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
> 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.

Yes.  That will be great.

>
> 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.
> >    *
> >