linux-kernel - Re: 2.6.23-rc6-mm1: failure to boot on HP nx6325, no sound when booted, USB-related WARNING

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Message-Id: <200709210035.55083.rjw@sisk.pl>
Date:	Fri, 21 Sep 2007 00:35:53 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...e.cz>,
	Takashi Iwai <tiwai@...e.de>,
	linux-usb-devel@...ts.sourceforge.net,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...l.org>, miklos@...redi.hu
Subject: Re: 2.6.23-rc6-mm1: failure to boot on HP nx6325, no sound when booted, USB-related WARNING

Thomas,

On Thursday, 20 September 2007 23:53, Thomas Gleixner wrote:
> Rafael,
> 
> On Thu, 2007-09-20 at 23:45 +0200, Rafael J. Wysocki wrote:
> > > We disable everything in device_suspend()
> > 
> > No, we don't.  sysdevs are _not_ suspended in device_suspend().
> > They are suspended in device_power_down(), which is called
> > _after_ disable_nonboot_cpus() (from swsusp_suspend()).
> > 
> > > including timekeeping,
> > 
> > No, the timekeeping is suspended in device_power_down() (or at least it should
> > be).
> 
> Damn, you are right. Reading through 30 different logs confused me.
> 
> > > 	enable_nonboot_cpus();
> > 
> > Actually, we can't do this here, because of ACPI and some interrupt handling
> > related problems.  Unfortunately, platform_finish() needs to go _after_
> > enable_nonboot_cpus() and device_resume() needs to go after platform_finish().
> > Analogously, disable_nonboot_cpus() has to go after platform_prepare().
> >
> > Otherwise, some systems will break.
> 
> Well, I don't buy this one. The system would break in the same way, when
> I take CPU#1 offline before I initiate the suspend.

I was referring to the resume part.  If we call enable_nonboot_cpus(), which
executes the _INI ACPI control method, after platform_finish(), which executes
the _WAK global ACPI control method, things will break.  That already happened
in the past, when the code ordering was different, AFAICS.

> > > and non-surprisingly the "my VAIO needs help from keyboard" problem went
> > > away immediately. See patch below. (on top of rc7-hrt1, -mm1 does not
> > > work at all on my VAIO due to some yet not identified wreckage)
> > 
> > Hm, I really don't know why it helps, but that's not because of the timekeeping
> > suspend, IMO.
> 
> It is related. We rely on some subtle thing which is not up when we
> resume the non boot cpu.

Yes, it looks so.

> > > I did not yet look into the suspend to ram code, but I guess that there
> > > is an equivalent problem.
> > 
> > Yes, the code ordering is the same, but it's not totally wrong, IMHO.
> > 
> > > But I have no idea why this affects Andrews jinxed VAIO (UP machine),
> > > though I suspect that we have more timekeeping/timer depending code
> > > somewhere waiting to bite us.
> > 
> > That's possible.
> > 
> > > Also I still need to debug why the HIBERNATION_TEST code path (which has
> > > a msleep(5000) in it) does not fail,
> > 
> > See above. :-)
> 
> Yes. It makes sense. When I change the TEST code path to:
> 
> -	printk("swsusp debug: Waiting for 5 seconds.\n");
> - 	msleep(5000);
> +	printk("swsusp debug: before swsusp_suspend\n");
> + 	error = swsusp_suspend();
> 
> then I have the same effect as I get from real hibernation. And we
> actually shut down time keeping somewhere in that code path.
> 
> ACPI: PCI interrupt for device 0000:00:1b.0 disabled
> swsusp debug: before swsusp_suspend
> Suspend timekeeping

Exactly.  timekeeping_suspend() is called from device_power_down(), which is
called from swsusp_suspend() (after disabling interrupts).

> swsusp: critical section: 
> swsusp: Need to copy 112429 pages
> swsusp: Normal pages needed: 35399 + 1024 + 40, available pages: 193876
> swsusp: critical section: done (112429 pages copied)
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> Resume timekeeping
> ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 16 (level, low) -> IRQ 16
> -> works fine
> 
> This is with my patch applied. Without that I get:
> 
> CPU1 is down
> swsusp debug: before swsusp_suspend
> Suspend timekeeping
> swsusp: critical section: 
> swsusp: Need to copy 112429 pages
> swsusp: Normal pages needed: 35399 + 1024 + 40, available pages: 193876
> swsusp: critical section: done (112429 pages copied)
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> Resume timekeeping
> Enabling non-boot CPUs
> --> Waits for ever until a key is pressed

Well, perhaps there's something else that we should suspend late and resume
early, but we don't?

Greetings,
Rafael
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