linux-kernel - Re: [PATCH v2 6/6] nvme-apple: Add initial Apple SoC NVMe driver

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Date:   Tue, 19 Apr 2022 11:52:15 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sven Peter <sven@...npeter.dev>
Cc:     "hch@....de" <hch@....de>, Keith Busch <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Marc Zyngier <maz@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org, linux-spdx@...r.kernel.org
Subject: Re: [PATCH v2 6/6] nvme-apple: Add initial Apple SoC NVMe driver

On Tue, Apr 19, 2022 at 11:47 AM Sven Peter <sven@...npeter.dev> wrote:
> On Tue, Apr 19, 2022, at 07:31, Christoph Hellwig wrote:
> > On Fri, Apr 15, 2022 at 04:20:55PM +0200, Sven Peter wrote:
> >> +++ b/drivers/nvme/host/apple.c
> >> @@ -0,0 +1,1597 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +/*
> >> + * Apple ANS NVM Express device driver
> >> + * Copyright The Asahi Linux Contributors
> >
> > Is that actually a valid legal entity?
> >
> >> +#include <linux/io-64-nonatomic-lo-hi.h>
> >
> > Does this controller still not support 64-bit MMIO accesses like
> > the old Apple PCIe controllers or is this just a leftover?
>
> I just checked again and 64-bit accesses seem to work fine.
> I'll remove the lo_hi_* calls and this include.

If you remove the #include, it is no longer possible to compile-test
this on all 32-bit architectures, though that is probably fine as long
as the Kconfig file has the right dependencies, like

      depends on ARCH_APPLE || (COMPILE_TEST && 64BIT)

I'd prefer to keep the #include here, but I don't mind the dependency
if Christoph prefers it that way.

       Arnd