linux-kernel - Re: [PATCH] [PATCH] of_reserved_mem: Increase the number of reserved regions

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Date:   Mon, 5 Oct 2020 13:57:20 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Phil Chang <phil.chang@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Alix Wu <alix.wu@...iatek.com>,
        YJ Chiang <yj.chiang@...iatek.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Joe Liu <joe.liu@...iatek.com>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH] [PATCH] of_reserved_mem: Increase the number of reserved regions

On Mon, Oct 5, 2020 at 12:17 PM Phil Chang <phil.chang@...iatek.com> wrote:
>
> Hi Chun-Kuang

Please don't top post to the lists.

> Sorry for typo. In fact, the dts of new SoC is not upstream yet. I'm so
> sorry for couldn't show the detail now.

Don't have to have the dts upstream. Can you point to a downstream dts
or post a snippet of the reserved memory?

> How about the configurable MAX_RESERVED_REGIONS size like this patch?
> https://patchwork.kernel.org/patch/10692101/

No, as I already said in that patch. But glad you found what's needed
to make it dynamic. But even for dynamic, I want to understand the
use.

Rob

>
>
> On Sun, 2020-10-04 at 21:05 +0800, Chun-Kuang Hu wrote:
> > Hi, Phil:
> >
> > Phil Chang <phil.chang@...iatek.com> 於 2020年10月4日 週日 下午1:51寫道：
> > >
> > > Certain SoCs need to support large amount of reserved memory
> > > regions, especially to follow the GKI rules from Google.
> > > In MTK new SoC requires more than 68 regions of reserved memory
> > > for each IP's usage, such as load firmware to specific sapce,
> >
> > space
> >
> > > so that need to reserve more regisions
> >
> > regions.
> >
> > I guess this requirement is from Mediatek SoC, but I find below device
> > tree and just find one reserved memory region,
> >
> > arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > arch/arm64/boot/dts/mediatek/mt8516.dtsi
> >
> > Could you show me the 68 regions?
> >
> > Regards,
> > Chun-Kuang.
> >
> > >
> > > Signed-off-by: Joe Liu <joe.liu@...iatek.com>
> > > Signed-off-by: YJ Chiang <yj.chiang@...iatek.com>
> > > Signed-off-by: Alix Wu <alix.wu@...iatek.com>
> > > Signed-off-by: Phil Chang <phil.chang@...iatek.com>
> > > ---
> > >  drivers/of/of_reserved_mem.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> > > index 46b9371c8a33..595f0741dcef 100644
> > > --- a/drivers/of/of_reserved_mem.c
> > > +++ b/drivers/of/of_reserved_mem.c
> > > @@ -22,7 +22,7 @@
> > >  #include <linux/slab.h>
> > >  #include <linux/memblock.h>
> > >
> > > -#define MAX_RESERVED_REGIONS   64
> > > +#define MAX_RESERVED_REGIONS   128
> > >  static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
> > >  static int reserved_mem_count;
> > >
> > > --
> > > 2.18.0
> > > _______________________________________________
> > > Linux-mediatek mailing list
> > > Linux-mediatek@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
>

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