linux-kernel - Re: [PATCH 2/9] iommu/ipmmu-vmsa: Hook up R8A774E1 DT matching code

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Message-ID: <CA+V-a8tB0mA17f51GMQQ-Cj_CUXze_JjTahrpoAtmwuOFHQV6g@mail.gmail.com>
Date:   Tue, 14 Jul 2020 09:30:16 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Joerg Roedel <joro@...tes.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        dmaengine <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] iommu/ipmmu-vmsa: Hook up R8A774E1 DT matching code

Hi Geert,

Thank you for the review.

On Tue, Jul 14, 2020 at 9:09 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, Jul 13, 2020 at 11:35 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > From: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>
> >
> > Add support for RZ/G2H (R8A774E1) SoC IPMMUs.
> >
> > Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Thanks for your patch!
>
> > --- a/drivers/iommu/ipmmu-vmsa.c
> > +++ b/drivers/iommu/ipmmu-vmsa.c
> > @@ -751,6 +751,7 @@ static const struct soc_device_attribute soc_rcar_gen3[] = {
> >  static const struct soc_device_attribute soc_rcar_gen3_whitelist[] = {
> >         { .soc_id = "r8a774b1", },
> >         { .soc_id = "r8a774c0", },
> > +       { .soc_id = "r8a774e1", },
>
> Adding an entry to soc_rcar_gen3_whitelist[] doesn't do anything, unless
> you also add the same entry to soc_rcar_gen3[].
>
I think the comment "For R-Car Gen3 use a white list to opt-in slave
devices." is misleading.  Booting through the kernel I do see iommu
groups (attached is the logs). Also the recent patch to add
"r8a77961" just adds to soc_rcar_gen3_whitelist.

Cheers,
--Prabhakar

> >         { .soc_id = "r8a7795", .revision = "ES3.*" },
> >         { .soc_id = "r8a77961", },
> >         { .soc_id = "r8a77965", },
> > @@ -963,6 +964,9 @@ static const struct of_device_id ipmmu_of_ids[] = {
> >         }, {
> >                 .compatible = "renesas,ipmmu-r8a774c0",
> >                 .data = &ipmmu_features_rcar_gen3,
> > +       }, {
> > +               .compatible = "renesas,ipmmu-r8a774e1",
> > +               .data = &ipmmu_features_rcar_gen3,
> >         }, {
> >                 .compatible = "renesas,ipmmu-r8a7795",
> >                 .data = &ipmmu_features_rcar_gen3,
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

View attachment "g2h_log.txt" of type "text/plain" (27847 bytes)