From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Dave Airlie <airlied@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Keith Packard <keithp@keithp.com>
Subject: Re: "do_IRQ: 0.89 No irq handler for vector (irq -1)"
Date: Wed, 13 Oct 2010 23:48:17 +0200 [thread overview]
Message-ID: <201010132348.17485.rjw@sisk.pl> (raw)
In-Reply-To: <20101013142043.4c24ebcd@jbarnes-desktop>
On Wednesday, October 13, 2010, Jesse Barnes wrote:
> On Tue, 12 Oct 2010 21:01:17 +0200
> "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
>
> > On Tuesday, October 12, 2010, Jesse Barnes wrote:
> > > On Mon, 11 Oct 2010 15:48:26 -0700
> > > Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
> > >
> > > > On Fri, 8 Oct 2010 21:46:50 +1000
> > > > Dave Airlie <airlied@gmail.com> wrote:
> > > > > Not sure how best to fix, I can workaround by calling
> > > > > pci_set_power_state(PCI_D0) in the drm drivers, but I sorta thing the
> > > > > PCI layer should take care of this.
> > > >
> > > > So I think we *should* be able to call pci_disable_device at remove
> > > > time. But as you say, some platforms may not correctly re-route VGA
> > > > space to an existing device or disable it properly when we do that.
> > > > AFAICT x86 will be ok here though (seems to work ok locally too).
> > >
> > > Just tested this some more, and I think it's the right thing to do in
> > > the KMS case at least. When we load a KMS driver it takes over the gfx
> > > device and nothing can assume anything about VGA state unless using the
> > > VGA arbiter. So calling pci_disable_device() in the shutdown path of a
> > > KMS driver shouldn't make things any worse, and will work around this
> > > issue.
> > >
> > > Doing so in the non-KMS case violates some PC assumptions though, in
> > > that things like vgacon and the BIOS will assume VGA memory is still
> > > around, which on some platforms pci_disable_device() may affect (I only
> > > checked the x86 implementation).
> > >
> > > > That said, it seems like we should update the current device state at
> > > > load time as well, once we've matched the driver it seems like there
> > > > should be no harm.
> > > >
> > > > Rafael, what do you think? Would having the correct power state at
> > > > load time cause any trouble with other PM code? I know we've had
> > > > issues with setting it explicitly in the past...
> > >
> > > So we should probably make pci_enable_device pick up the current state
> > > as well, instead of assuming it's unknown just because the enable count
> > > was non-zero (which as Dave points out, can be affected by sysfs writes
> > > too).
> > >
> > > The only downside I can think of there is that if the device is already
> > > enabled, we generally have to assume another driver owns it, and who
> > > knows if the device is actually alive enough to read the current state
> > > from. But I think we handle those errors ok too, so pulling it out
> > > should be safe.
> >
> > I remember trying to do something like this and it didn't play well with the
> > initialization. Still, I didn't do that in pci_enable_device(), so I can't say
> > for sure at the moment. I _think_ it will be fine, though.
>
> Here's what I had in mind. I think it's safer than setting the power
> state at enable time, and it works around the enable_cnt leak in the
> DRM drivers.
However, it would have to be done after pci_pm_init() runs. Perhaps we can
make pci_pm_init() itself put the device into D0?
Thanks,
Rafael
next prev parent reply other threads:[~2010-10-13 21:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-07 8:55 "do_IRQ: 0.89 No irq handler for vector (irq -1)" Dave Airlie
2010-10-07 9:05 ` Dave Airlie
2010-10-07 20:38 ` Thomas Gleixner
2010-10-07 21:35 ` Thomas Gleixner
2010-10-08 7:52 ` Thomas Gleixner
2010-10-08 11:46 ` Dave Airlie
2010-10-11 22:48 ` Jesse Barnes
2010-10-11 23:40 ` Jesse Barnes
2010-10-12 19:01 ` Rafael J. Wysocki
2010-10-12 19:49 ` Jesse Barnes
2010-11-16 19:46 ` Florian Mickler
2010-11-16 20:11 ` Jesse Barnes
2010-11-16 20:47 ` Florian Mickler
2010-10-13 21:20 ` Jesse Barnes
2010-10-13 21:48 ` Rafael J. Wysocki [this message]
2010-10-08 11:53 ` Chris Wilson
2010-10-08 12:15 ` Thomas Gleixner
2010-10-08 12:30 ` Chris Wilson
2010-10-10 17:46 ` Maciej Rutecki
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