linux-kernel - Re: [PATCH v2 1/2] soc: hisilicon: Support HCCS driver on Kunpeng SoC

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Date:   Tue, 23 May 2023 14:41:35 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     "lihuisong (C)" <lihuisong@...wei.com>
Cc:     andersson@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, shawnguo@...nel.org,
        arnd@...db.de, krzk@...nel.org, linux-kernel@...r.kernel.org,
        soc@...nel.org, wanghuiqiang@...wei.com, tanxiaofei@...wei.com,
        liuyonglong@...wei.com
Subject: Re: [PATCH v2 1/2] soc: hisilicon: Support HCCS driver on Kunpeng SoC

On Tue, May 23, 2023 at 07:57:42PM +0800, lihuisong (C) wrote:
> 
> 在 2023/5/23 17:39, Sudeep Holla 写道:
> > On Mon, May 22, 2023 at 03:22:10PM +0800, Huisong Li wrote:
> > > The Huawei Cache-Coherent System (HCCS) is a bus protocol standard
> > > for ensuring cache coherent on HiSilicon SoC. The performance of
> > > the application may be affected if some hccs ports are in non-full
> > > lane status, have a large number of CRC errors and so on.
> > > 
> > > This driver provides the query interface of the health status and
> > > port information of HCCS on Kunpeng SoC.
> > > 
> > > Signed-off-by: Huisong Li <lihuisong@...wei.com>
> > > ---
> > >   MAINTAINERS                          |    6 +
> > >   drivers/soc/Kconfig                  |    1 +
> > >   drivers/soc/Makefile                 |    1 +
> > >   drivers/soc/hisilicon/Kconfig        |   19 +
> > >   drivers/soc/hisilicon/Makefile       |    2 +
> > >   drivers/soc/hisilicon/kunpeng_hccs.c | 1287 ++++++++++++++++++++++++++
> > >   drivers/soc/hisilicon/kunpeng_hccs.h |  196 ++++
> > >   7 files changed, 1512 insertions(+)
> > >   create mode 100644 drivers/soc/hisilicon/Kconfig
> > >   create mode 100644 drivers/soc/hisilicon/Makefile
> > >   create mode 100644 drivers/soc/hisilicon/kunpeng_hccs.c
> > >   create mode 100644 drivers/soc/hisilicon/kunpeng_hccs.h
> > > 
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index eddbc48c61e9..fe0e796e8445 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -9399,6 +9399,12 @@ S:	Maintained
> > >   W:	http://www.hisilicon.com
> > >   F:	drivers/spi/spi-hisi-sfc-v3xx.c
> > > +HISILICON KUNPENG SOC HCCS DRIVER
> > s/HCCS/HCCS INFO or QUERY/ ?
> From the current features, what you suggest is suitable.
> But this driver will support to the setting feature.

Ah OK, I wasn't aware of that, in that case it is fine to keep it as is
and add comment about future feature expansions so that the name makes
more sense them. I assumed it is more a query interface.

I also assume the settings with just control performance and is fully
safe and stability of the system is taken care.

[...]

> > > +
> > > +/* PCC defines */
> > > +#define HCCS_PCC_SIGNATURE_MASK		0x50434300
> > > +#define HCCS_PCC_STATUS_CMD_COMPLETE	BIT(0)
> > I am not really sure if we keep duplicating this. I will try to cook up
> > a patch consolidating these.
> Yes, these info is better placed in a global header.
> Do I need to do this in this series?
> Or do not modify it, and then process all related code in your patch.

Fair enough, we can do that later. I don't want to block this for that reason.

-- 
Regards,
Sudeep