linux-kernel - Re: [PATCH 00/10] Hi,

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Message-ID: <CAL_JsqLf2e3z+m14264WFcsQgiwKR35Rs9Rw0c_MgoFvKwO2Xg@mail.gmail.com>
Date:   Tue, 25 Feb 2020 10:32:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michal Simek <monstr@...str.eu>, git <git@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Borislav Petkov <bp@...e.de>,
        Cornelia Huck <cohuck@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mubin Sayyed <mubinusm@...inx.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        Siva Durga Prasad Paladugu <siva.durga.paladugu@...inx.com>,
        Stefan Asserhall <stefan.asserhall@...inx.com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Will Deacon <will@...nel.org>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>, linux-mm@...ck.org,
        Bharat Kumar Gogada <bharatku@...inx.com>
Subject: Re: [PATCH 00/10] Hi,

On Mon, Feb 17, 2020 at 8:28 AM Michal Simek <michal.simek@...inx.com> wrote:
>
> Hi Rob,
>
> On 14. 02. 20 0:47, Rob Herring wrote:
> > On Wed, Feb 12, 2020 at 2:58 AM Michal Simek <michal.simek@...inx.com> wrote:
> >>
> >>
> >> I am sending this series as before SMP support.
> >> Most of these patches are clean ups and should be easy to review them. I
> >> expect there will be more discussions about SMP support.
> >
> > While not really related to adding SMP, any chance you or someone
> > could look at moving microblaze PCI support to drivers/pci/? I suspect
> > much of the code should drop out as we have common helpers for much of
> > it now. That would leave only powerpc and mips for DT+PCI platforms.
>
> can you please suggest changes which could be done?
> I have CC Bharat and he could look at it.

Look at the host controller drivers in drivers/pci/controller/.
pci-host-{generic,common}.c is a good template to start with as that's
a controller with standard config space accesses and no h/w setup
needed. Essentially you need to call devm_pci_alloc_host_bridge(),
pci_parse_request_of_pci_ranges() and pci_host_probe() with whatever
h/w setup you need in between those calls.

Looking at the microblaze PCI code, looks like you may need custom
config space accessors which is quite common. Probably all the
resource and device scanning can be removed. If you look at arm64, all
the arch PCI code is just for ACPI.

Rob