linux-kernel - Re: [PATCH v2] arm64: dts: rockchip: rk356x: Fix PCIe register map and ranges

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Date:   Fri, 21 Oct 2022 12:48:15 -0400
From:   Peter Geis <pgwipeout@...il.com>
To:     Ondřej Jirman <megi@....cz>,
        Peter Geis <pgwipeout@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Yifeng Zhao <yifeng.zhao@...k-chips.com>,
        Johan Jonker <jbx6244@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Rockchip SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: rockchip: rk356x: Fix PCIe register map
 and ranges

On Fri, Oct 21, 2022 at 11:39 AM Ondřej Jirman <megi@....cz> wrote:
>
> On Fri, Oct 21, 2022 at 09:07:50AM -0400, Peter Geis wrote:
> > Good Morning Heiko,
> >
> > Apologies for just getting to this, I'm still in the middle of moving
> > and just got my lab set back up.
> >
> > I've tested this patch series and it leads to the same regression with
> > NVMe drives. A loop of md5sum on two identical 4GB random files
> > produces the following results:
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand.img
> > fad97e91da8d4fd554c895cafa89809b  test-rand2.img
> > 2d56a7baa05c38535f4c19a2b371f90a  test-rand.img
> > 74e8e6f93d7c3dc3ad250e91176f5901  test-rand2.img
> > 25cfcfecf4dd529e4e9fbbe2be482053  test-rand.img
> > 74e8e6f93d7c3dc3ad250e91176f5901  test-rand2.img
> > b9637505bf88ed725f6d03deb7065dab  test-rand.img
> > f7437e88d524ea92e097db51dce1c60d  test-rand2.img
> >
> > Before this patch series:
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand2.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand2.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand2.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand.img
> > d11cf0caa541b72551ca22dc5bef2de0  test-rand2.img
> >
> > Though I do love where this patch is going and would like to see if it
> > can be made to work, in its current form it does not.
>
> Thanks for the test. Can you please also test v1? Also please share lspci -vvv
> of your nvme drive, so that we can see allocated address ranges, etc.

Good catch, with your patch as is, the following issue crops up:
Region 0: Memory at 300000000 (64-bit, non-prefetchable) [size=16K]
Region 2: I/O ports at 1000 [disabled] [size=256]

However, with a simple fix, we can get this:
Region 0: Memory at 300000000 (64-bit, non-prefetchable) [virtual] [size=16K]
Region 2: I/O ports at 1000 [virtual] [size=256]

and with it a working NVMe drive.

Change the following range:
0x02000000 0x0 0x40000000 0x3 0x00000000 0x0 0x40000000>;
to
0x02000000 0x0 0x00000000 0x3 0x00000000 0x0 0x40000000>;

I still haven't tested this with other cards yet, and another patch
that does similar work I've tested successfully as well with NVMe
drives. I'll have to get back to you on the results of greater
testing.

Very Respectfully,
Peter Geis

>
> kind regards,
>         o.
>
> > Very Respectfully,
> > Peter Geis