From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: "Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Felix Fietkau" <nbd@nbd.name>,
"David Woodhouse" <dwmw2@infradead.org>,
"Jörg Rödel" <jroedel@suse.de>, "Joerg Roedel" <joro@8bytes.org>,
"Roman Pen" <r.peniaev@gmail.com>,
"Bjorn Andersson" <bjorn.andersson@linaro.org>,
"Ming Lei" <ming.lei@canonical.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
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hauke@hauke-m.de, "Josh Boyer" <jwboyer@fedoraproject.org>,
"Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
jslaby@suse.com, "Linus Torvalds" <torvalds@linux-foundation.org>,
"Andy Lutomirski" <luto@amacapital.net>,
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Abhay_Salunke@dell.com, "Julia Lawall" <Julia.Lawall@lip6.fr>,
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"Tom Gundersen" <teg@jklm.no>,
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"Kees Cook" <keescook@chromium.org>,
"Jonathan Corbet" <corbet@lwn.net>,
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cocci@systeme.lip6.fr, linux-serial@vger.kernel.org,
linux-doc@vger.kernel.org,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH v2 2/5] firmware: annotate thou shalt not request fw on init or probe
Date: Sat, 3 Sep 2016 01:59:16 +0200 [thread overview]
Message-ID: <20160902235916.GO3296@wotan.suse.de> (raw)
In-Reply-To: <20160825194133.GC3296@wotan.suse.de>
On Thu, Aug 25, 2016 at 09:41:33PM +0200, Luis R. Rodriguez wrote:
> On Thu, Aug 25, 2016 at 01:05:44PM +0200, Daniel Vetter wrote:
> > On Wed, Aug 24, 2016 at 10:39 PM, Luis R. Rodriguez <mcgrof@kernel.org> wrote:
> > Some users want a fully running gfx stack 2s after power-on. There's
> > not even enough time to load an uefi or vga driver first. i915
> > directly initializes the gpu from power-on state on those.
>
> I see.. thanks.
>
> > >> I think what would work is loading the different subsystems of the
> > >> driver in parallel (we already do that largely)
> > >
> > > Init level stuff is actually pretty synchronous, and in fact both
> > > init and probe are called serially. There are a few subsystems which
> > > have been doing things a bit differently, but these are exceptions.
> > >
> > > When you say we already do this largely, can you describe a bit more
> > > precisely what you mean ?
> >
> > Oh, this isn't subsystems as in linux device/driver model, but
> > different parts within the driver. We fire up a bunch of struct work
> > to get various bits done asynchronously.
>
> Thanks for the clarification.
<-- snip -->
> > One of the proposals which would have worked for us died a while back:
> >
> > https://lkml.org/lkml/2014/6/15/47
>
> Interesting, the problem stated here, which comes from the fact (as clarified
> above) the rootfs comes up only *after* we run do_initcalls() as such there are
> possible theoretical races even with request_firmware_nowait() -- as such that
> justifies even more the SmPL grammar rule to include even request_firmware_nowait()
> on probe / init as this patch has.
>
> Anyway yeah that patch has good intentions but its wrong for a slew of reasons.
> The problem is the same as discussed with Bjorn recently. The solution
> discussed is that since only userspace knows when the *real* rootfs is ready
> (because of slew of reasons) the best we can do is have an event issued by
> userspace to inform us of that.
OK I have something I think we can build upon for this. Will send RFC.
Luis
next prev parent reply other threads:[~2016-09-02 23:59 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 22:54 [PATCH v2 0/5] firmware: add SmPL grammar to avoid issues Luis R. Rodriguez
2016-06-16 22:54 ` [PATCH v2 1/5] MAINTAINERS: extend firmware_class maintainer list Luis R. Rodriguez
2016-06-16 22:54 ` [PATCH v2 2/5] firmware: annotate thou shalt not request fw on init or probe Luis R. Rodriguez
2016-08-24 6:55 ` Daniel Vetter
2016-08-24 20:39 ` Luis R. Rodriguez
2016-08-25 11:05 ` Daniel Vetter
2016-08-25 19:41 ` Luis R. Rodriguez
2016-08-25 20:10 ` Daniel Vetter
2016-08-25 20:25 ` Luis R. Rodriguez
2016-08-25 20:30 ` Dmitry Torokhov
2016-09-02 23:59 ` Luis R. Rodriguez [this message]
2016-09-03 0:20 ` [RFC] fs: add userspace critical mounts event support Luis R. Rodriguez
2016-09-03 4:11 ` Linus Torvalds
2016-09-03 4:20 ` Dmitry Torokhov
[not found] ` <CA+55aFz4q5peXAeY9h8o3he7R=wXrBSYkOjMM9TehOw=pPoS+Q@mail.gmail.com>
2016-09-03 17:49 ` Dmitry Torokhov
2016-09-03 18:01 ` Linus Torvalds
2016-09-03 18:10 ` Dmitry Torokhov
2016-09-06 21:52 ` Luis R. Rodriguez
2016-09-06 22:28 ` Bjorn Andersson
2016-09-06 23:14 ` Luis R. Rodriguez
2016-09-24 1:37 ` Herbert, Marc
2016-09-24 17:41 ` Dmitry Torokhov
2016-10-05 0:00 ` Luis R. Rodriguez
2016-10-05 0:12 ` Linus Torvalds
2016-10-05 0:24 ` Luis R. Rodriguez
2016-10-05 0:32 ` Linus Torvalds
2016-10-05 17:38 ` Luis R. Rodriguez
2016-10-05 1:48 ` Josh Triplett
2016-10-05 1:58 ` Linus Torvalds
2016-09-06 17:46 ` Bjorn Andersson
2016-09-06 18:32 ` Linus Torvalds
2016-09-06 21:11 ` Bjorn Andersson
2016-09-06 21:50 ` Linus Torvalds
2016-09-06 23:04 ` Luis R. Rodriguez
2016-09-24 2:51 ` Herbert, Marc
2016-10-04 23:28 ` Luis R. Rodriguez
2016-09-06 22:32 ` Luis R. Rodriguez
2016-09-14 2:38 ` Rob Landley
2016-10-05 18:00 ` Luis R. Rodriguez
2016-10-05 18:08 ` Linus Torvalds
2016-10-05 19:46 ` Luis R. Rodriguez
2016-11-08 22:47 ` Luis R. Rodriguez
2016-11-09 9:13 ` Daniel Wagner
2016-11-09 23:40 ` Luis R. Rodriguez
2016-11-15 9:28 ` Johannes Berg
2016-06-16 22:54 ` [PATCH v2 3/5] firmware: update usermode helper docs and add SmPL report Luis R. Rodriguez
2016-06-16 22:54 ` [PATCH v2 4/5] firmware: add usermode helper DECLARE_FW_LOADER_USER() annotation Luis R. Rodriguez
2016-06-16 22:54 ` [PATCH v2 5/5] firmware: fix fw cache to avoid usermode helper on suspend Luis R. Rodriguez
2016-07-07 0:56 ` [PATCH v2 0/5] firmware: add SmPL grammar to avoid issues Luis R. Rodriguez
2016-07-13 21:47 ` Luis R. Rodriguez
2016-07-28 0:41 ` Luis R. Rodriguez
2016-08-03 14:50 ` Luis R. Rodriguez
2016-08-03 15:04 ` Greg KH
2016-08-03 17:06 ` Luis R. Rodriguez
2016-08-03 19:32 ` Greg KH
2016-08-03 19:46 ` Luis R. Rodriguez
2016-07-13 23:52 ` Fengguang Wu
2016-07-14 2:15 ` Luis R. Rodriguez
2016-07-14 2:23 ` Fengguang Wu
2016-07-14 3:08 ` Luis R. Rodriguez
2016-07-14 3:35 ` Fengguang Wu
2016-08-24 0:45 ` [PATCH v3 " mcgrof
2016-08-24 0:45 ` [PATCH v3 1/5] MAINTAINERS: extend firmware_class maintainer list mcgrof
2016-08-24 0:45 ` [PATCH v3 2/5] firmware: annotate thou shalt not request fw on init or probe mcgrof
2016-08-24 8:17 ` Gabriel Paubert
2016-09-02 18:26 ` Luis R. Rodriguez
2016-08-24 0:45 ` [PATCH v3 3/5] firmware: update usermode helper docs and add SmPL report mcgrof
2016-08-24 0:45 ` [PATCH v3 4/5] firmware: add usermode helper DECLARE_FW_LOADER_USER() annotation mcgrof
2016-08-24 0:45 ` [PATCH v3 5/5] firmware: fix fw cache to avoid usermode helper on suspend mcgrof
2016-08-31 7:03 ` Daniel Wagner
2016-09-02 18:13 ` Luis R. Rodriguez
2016-09-07 0:42 ` [PATCH v4 0/5] firmware: add SmPL grammar to avoid issues Luis R. Rodriguez
2016-09-07 0:42 ` [PATCH v4 1/5] MAINTAINERS: extend firmware_class maintainer list Luis R. Rodriguez
2016-09-07 6:43 ` Greg KH
2016-09-08 14:58 ` Luis R. Rodriguez
2016-09-08 15:25 ` Ming Lei
2016-09-07 0:42 ` [PATCH v4 2/5] firmware: annotate thou shalt not request fw on init or probe Luis R. Rodriguez
2016-09-07 0:42 ` [PATCH v4 3/5] firmware: update usermode helper docs and add SmPL report Luis R. Rodriguez
2016-09-07 0:42 ` [PATCH v4 4/5] firmware: add usermode helper DECLARE_FW_LOADER_USER() annotation Luis R. Rodriguez
2016-09-07 0:42 ` [PATCH v4 5/5] firmware: fix fw cache to avoid usermode helper on suspend Luis R. Rodriguez
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