linux-kernel - Re: [PATCH v3 3/6] soc: sifive: ccache: determine the cache level from dts

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Date:   Mon, 12 Sep 2022 14:37:48 +0800
From:   Zong Li <zong.li@...ive.com>
To:     Conor Dooley <Conor.Dooley@...rochip.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Greentime Hu <greentime.hu@...ive.com>,
        Ben Dooks <ben.dooks@...ive.com>, bp@...en8.de,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-edac@...r.kernel.org,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/6] soc: sifive: ccache: determine the cache level
 from dts

On Fri, Sep 9, 2022 at 2:28 AM <Conor.Dooley@...rochip.com> wrote:
>
> On 08/09/2022 15:44, Zong Li wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > Composable cache could be L2 or L3 cache, use 'cache-level' property of
> > device node to determine the level.
> >
> > Signed-off-by: Zong Li <zong.li@...ive.com>
> > Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> > ---
> >  drivers/soc/sifive/sifive_ccache.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/soc/sifive/sifive_ccache.c b/drivers/soc/sifive/sifive_ccache.c
> > index 949b824e89ad..690c19489317 100644
> > --- a/drivers/soc/sifive/sifive_ccache.c
> > +++ b/drivers/soc/sifive/sifive_ccache.c
> > @@ -38,6 +38,7 @@
> >  static void __iomem *ccache_base;
> >  static int g_irq[SIFIVE_CCACHE_MAX_ECCINTR];
> >  static struct riscv_cacheinfo_ops ccache_cache_ops;
> > +static int level;
> >
> >  enum {
> >         DIR_CORR = 0,
> > @@ -144,7 +145,7 @@ static const struct attribute_group *ccache_get_priv_group(struct cacheinfo
> >                                                            *this_leaf)
> >  {
> >         /* We want to use private group for composable cache only */
> > -       if (this_leaf->level == 2)
> > +       if (this_leaf->level == level)
> >                 return &priv_attr_group;
> >         else
> >                 return NULL;
> > @@ -215,6 +216,9 @@ static int __init sifive_ccache_init(void)
> >         if (!ccache_base)
> >                 return -ENOMEM;
> >
> > +       if (of_property_read_u32(np, "cache-level", &level))
> > +               return -ENODEV;
>
> I think ENOENT or EINVAL are more comment patterns here?
>
> Either way,
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>

I will fix it in V4 patch. Thanks

> > +
> >         intr_num = of_property_count_u32_elems(np, "interrupts");
> >         if (!intr_num) {
> >                 pr_err("CCACHE: no interrupts property\n");
> > --
> > 2.17.1
> >
>