linux-kernel - Re: [PATCH 1/2] platform: goldfish: Allow goldfish virtual platform drivers for RISCV

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Date:   Wed, 25 Sep 2019 10:46:52 +0530
From:   Anup Patel <anup@...infault.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Anup Patel <Anup.Patel@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Roman Kiryanov <rkir@...gle.com>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Christoph Hellwig <hch@...radead.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] platform: goldfish: Allow goldfish virtual platform
 drivers for RISCV

On Wed, Sep 25, 2019 at 10:37 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Sep 25, 2019 at 10:30:00AM +0530, Anup Patel wrote:
> > On Wed, Sep 25, 2019 at 10:13 AM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > >
> > > On Wed, Sep 25, 2019 at 04:30:03AM +0000, Anup Patel wrote:
> > > > We will be using some of the Goldfish virtual platform devices (such
> > > > as RTC) on QEMU RISC-V virt machine so this patch enables goldfish
> > > > kconfig option for RISC-V architecture.
> > > >
> > > > Signed-off-by: Anup Patel <anup.patel@....com>
> > > > ---
> > > >  drivers/platform/goldfish/Kconfig | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/platform/goldfish/Kconfig b/drivers/platform/goldfish/Kconfig
> > > > index 77b35df3a801..0ba825030ffe 100644
> > > > --- a/drivers/platform/goldfish/Kconfig
> > > > +++ b/drivers/platform/goldfish/Kconfig
> > > > @@ -1,7 +1,7 @@
> > > >  # SPDX-License-Identifier: GPL-2.0-only
> > > >  menuconfig GOLDFISH
> > > >       bool "Platform support for Goldfish virtual devices"
> > > > -     depends on X86_32 || X86_64 || ARM || ARM64 || MIPS
> > > > +     depends on X86_32 || X86_64 || ARM || ARM64 || MIPS || RISCV
> > >
> > > Why does this depend on any of these?  Can't we just have:
> >
> > May be Goldfish drivers were compile tested/tried on these architectures only.
>
> True, but that does not mean a driver should only have a specific list
> of arches.  This should only be needed if you _know_ it doesn't work on
> a specific arch, not the other way around.

No problem, I will drop depends on various architectures line

>
> > > >       depends on HAS_IOMEM
> > >
> > > And that's it?
> >
> > I think it should be just "depends on HAS_IOMEM && HAS_DMA" just like
> > VirtIO MMIO. Agree ??
>
> No idea, but if that's what  is needed for building, then sure :)

The Goldfish framebuffer can do DMA access so I add dependency on
HAS_DMA.

Refer, https://android.googlesource.com/platform/external/qemu/+/master/docs/GOLDFISH-VIRTUAL-HARDWARE.TXT

I will send v2 as-per above.

Regards,
Anup