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Date:   Mon, 26 Sep 2022 13:25:05 -0500
From:   Rob Herring <robh@...nel.org>
To:     Olof Johansson <olof@...om.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Al Cooper <alcooperx@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Russell King <linux@...linux.org.uk>,
        Vineet Gupta <vgupta@...nel.org>,
        Richard Genoud <richard.genoud@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Alexander Shiyan <shc_work@...l.ru>,
        Baruch Siach <baruch@...s.co.il>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Karol Gugala <kgugala@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Gabriel Somlo <gsomlo@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Taichi Sugaya <sugaya.taichi@...ionext.com>,
        Takao Orito <orito.takao@...ionext.com>,
        Liviu Dudau <liviu.dudau@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Pali Rohar <pali@...nel.org>,
        Andreas Farber <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
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        Laxman Dewangan <ldewangan@...dia.com>,
        Palmer Dabbelt <palmer@...belt.com>,
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        Baolin Wang <baolin.wang7@...il.com>,
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        Patrice Chotard <patrice.chotard@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        "David S. Miller" <davem@...emloft.net>,
        Hammer Hsieh <hammerh0314@...il.com>,
        Peter Korsgaard <jacmet@...site.dk>,
        Timur Tabi <timur@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
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        kevin hilman <khilman@...nel.org>,
        ulf hansson <ulf.hansson@...aro.org>,
        len brown <len.brown@...el.com>, pavel machek <pavel@....cz>,
        joerg roedel <joro@...tes.org>, will deacon <will@...nel.org>,
        andrew lunn <andrew@...n.ch>,
        heiner kallweit <hkallweit1@...il.com>,
        eric dumazet <edumazet@...gle.com>,
        jakub kicinski <kuba@...nel.org>,
        paolo abeni <pabeni@...hat.com>,
        linus walleij <linus.walleij@...aro.org>,
        hideaki yoshifuji <yoshfuji@...ux-ipv6.org>,
        david ahern <dsahern@...nel.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-gpio@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
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        sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 0/2] Fix console probe delay when stdout-path isn't set

On Mon, Sep 19, 2022 at 5:56 PM Olof Johansson <olof@...om.net> wrote:
>
> On Mon, Sep 19, 2022 at 1:44 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Sun, Sep 18, 2022 at 08:44:27PM -0700, Olof Johansson wrote:
> > > On Tue, Aug 23, 2022 at 8:37 AM Greg Kroah-Hartman
> > > <gregkh@...uxfoundation.org> wrote:
> > > >
> > > > On Thu, Jun 30, 2022 at 06:26:38PM -0700, Saravana Kannan wrote:
> > > > > These patches are on top of driver-core-next.
> > > > >
> > > > > Even if stdout-path isn't set in DT, this patch should take console
> > > > > probe times back to how they were before the deferred_probe_timeout
> > > > > clean up series[1].
> > > >
> > > > Now dropped from my queue due to lack of a response to other reviewer's
> > > > questions.
> > >
> > > What happened to this patch? I have a 10 second timeout on console
> > > probe on my SiFive Unmatched, and I don't see this flag being set for
> > > the serial driver. In fact, I don't see it anywhere in-tree. I can't
> > > seem to locate another patchset from Saravana around this though, so
> > > I'm not sure where to look for a missing piece for the sifive serial
> > > driver.
> > >
> > > This is the second boot time regression (this one not fatal, unlike
> > > the Layerscape PCIe one) from the fw_devlink patchset.
> > >
> > > Greg, can you revert the whole set for 6.0, please? It's obviously
> > > nowhere near tested enough to go in and I expect we'll see a bunch of
> > > -stable fixups due to this if we let it remain in.
> >
> > What exactly is "the whole set"?  I have the default option fix queued
> > up and will send that to Linus later this week (am traveling back from
> > Plumbers still), but have not heard any problems about any other issues
> > at all other than your report.
>
> I stand corrected in this case, the issue on the Hifive Unmatched was
> a regression due to a PWM clock change -- I just sent a patch for that
> (serial driver fix).
>
> So it seems like as long as the fw_devlink.strict=1 patch is reverted,
> things are back to a working state here.
>
> I still struggle with how the fw_devlink patchset is expected to work
> though, since DT is expected to describe the hardware configuration,
> and it has no knowledge of whether there are drivers that will be
> bound to any referenced supplier devnodes. It's not going to work well
> to assume that they will always be bound, and to add 10 second
> timeouts for those cases isn't a good solution. Seems like the number
> of special cases will keep adding up.

Since the introduction of deferred probe, the kernel has always
assumed if there is a device described, then there is or will be a
driver for it. The result is you can't use new DTs (if they add
providers) with older kernels.

We've ended up with a timeout because no one has come up with a better
way to handle it. What the kernel needs is userspace saying "I'm done
loading modules", but it's debatable whether that's a good solution
too.

Rob

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