Re: [PATCH] firmware: wake all waiters

From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>,
	Jakub Kicinski <jakub.kicinski@netronome.com>,
	Ming Lei <ming.lei@redhat.com>,
	yi1.li@linux.intel.com, "AKASHI,
	Takahiro" <takahiro.akashi@linaro.org>,
	nbroeking@me.com, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	mfuzzey@parkeon.com, ebiederm@xmission.com,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Daniel Wagner <wagi@monom.org>,
	David Woodhouse <dwmw2@infradead.org>,
	jewalt@lgsinnovations.com, rafal@milecki.pl,
	Arend van Spriel <arend.vanspriel@broadcom.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	atull@kernel.org, Moritz Fischer <moritz.fischer@ettus.com>,
	pmladek@suse.com, Johannes Berg <johannes.berg@intel.com>,
	emmanuel.grumbach@intel.com,
	Luca Coelho <luciano.coelho@intel.com>,
	luto@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
	Kees Cook <keescook@chromium.org>,
	David Howells <dhowells@redhat.com>,
	pjones@redhat.com, Hans de Goede <hdegoede@redhat.com>,
	alan@linux.intel.com, "Theodore Ts'o" <tytso@mit.edu>,
	paul.gortmaker@windriver.com, mtosatti@redhat.com,
	mawilcox@microsoft.com, Stephen Boyd <stephen.boyd@linaro.org>,
	Vikram Mulukutla <markivx@codeaurora.org>,
	lkml <linux-kernel@vger.kernel.org>,
	oss-drivers@netronome.com
Subject: Re: [PATCH] firmware: wake all waiters
Date: Tue, 27 Jun 2017 21:08:53 +0200	[thread overview]
Message-ID: <20170627190853.GX21846@wotan.suse.de> (raw)
In-Reply-To: <20170627185915.GK18666@tuxbook>

On Tue, Jun 27, 2017 at 11:59:15AM -0700, Bjorn Andersson wrote:
> On Tue 27 Jun 11:03 PDT 2017, Luis R. Rodriguez wrote:
> [..]
> > Let's consider a crazy case where the uevent gets triggered, and userspace goes
> > and signals Elon Musk somehow to transmit the needed firmware from Mars through
> > a serial satellite link to earth, and somehow someday the device is finally
> > ready to upload firmware from userspace. Once Elon's firmware lands home, we
> > know all needed firmware has arrived so anything missing we can acknowledge now
> > as missing, so we upload what we can and kick firmward into final-mode to tell
> > the kernel we know we're really ready and any pending things will have to be
> > given up.
> > 
> > This would prove the custom fallback crap was also never needed.
> > 
> 
> Are you saying that each kernel driver should be written so that it will
> either do direct loading or use firmwared?

Hell No! You can fork firmwared or use whatever the hell bin-foo you want.
Even if its proprietary and glued with evil rainbow unicorns on it.  The dual
mode, best-effort mode and final-mode devices it implemented are key to what
you want to mimic as an example to achieve the goal in question.

Please give that thought / architecture solution a spin and let me know if
it suffices for your needs.

  Luis