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Date: Wed, 18 Mar 2015 12:22:01 +0200
From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
To: Paul Bolle <pebolle@...cali.nl>
Cc: Imre Deak <imre.deak@...el.com>, intel-gfx@...ts.freedesktop.org,
Bjørn Mork <bjorn@...k.no>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
Daniel Vetter <daniel.vetter@...ll.ch>,
Jani Nikula <jani.nikula@...el.com>,
David Weinehall <david.weinehall@...ux.intel.com>
Subject: Re: [PATCH v2] drm/i915: gen4: work around hang during hibernation
On Wed, Mar 18, 2015 at 10:37:16AM +0100, Paul Bolle wrote:
> Imre Deak schreef op ma 02-03-2015 om 13:04 [+0200]:
> > Bjørn reported that his machine hang during hibernation and eventually
> > bisected the problem to the following commit:
> >
> > commit da2bc1b9db3351addd293e5b82757efe1f77ed1d
> > Author: Imre Deak <imre.deak@...el.com>
> > Date: Thu Oct 23 19:23:26 2014 +0300
> >
> > drm/i915: add poweroff_late handler
> >
> > The problem seems to be that after the kernel puts the device into D3
> > the BIOS still tries to access it, or otherwise assumes that it's in D0.
> > This is clearly bogus, since ACPI mandates that devices are put into D3
> > by the OSPM if they are not wake-up sources. In the future we want to
> > unify more of the driver's runtime and system suspend paths, for example
> > by skipping all the system suspend/hibernation hooks if the device is
> > runtime suspended already. Accordingly for all other platforms the goal
> > is still to properly power down the device during hibernation.
> >
> > v2:
> > - Another GEN4 Lenovo laptop had the same issue, while platforms from
> > other vendors (including mobile and desktop, GEN4 and non-GEN4) seem
> > to work fine. Based on this apply the workaround on all GEN4 Lenovo
> > platforms.
> > - add code comment about failing platforms (Ville)
>
> The outdated ThinkPad X41 that I torture by running rc's showed
> identical symptoms, also since v3.19-rc1. It uses a gen3 chipset (it has
> a 915GM, I think, but I keep forgetting details like that).
>
> I did everything wrong to get this fixed (1: hope this gets magically
> fixed; 2: bisect it myself, thinking every now and then that I know
> better than git bisect which commit to choose; 3: finally grep lkml). So
> here I am late to the show.
>
> > Reference: http://lists.freedesktop.org/archives/intel-gfx/2015-February/060633.html
> > Reported-and-bisected-by: Bjørn Mork <bjorn@...k.no>
> > Signed-off-by: Imre Deak <imre.deak@...el.com>
> > ---
> > drivers/gpu/drm/i915/i915_drv.c | 30 +++++++++++++++++++++++++-----
> > 1 file changed, 25 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index 4badb23..ff3662f 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -637,7 +637,7 @@ static int i915_drm_suspend(struct drm_device *dev)
> > return 0;
> > }
> >
> > -static int i915_drm_suspend_late(struct drm_device *drm_dev)
> > +static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation)
> > {
> > struct drm_i915_private *dev_priv = drm_dev->dev_private;
> > int ret;
> > @@ -651,7 +651,17 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev)
> > }
> >
> > pci_disable_device(drm_dev->pdev);
> > - pci_set_power_state(drm_dev->pdev, PCI_D3hot);
> > + /*
> > + * During hibernation on some GEN4 platforms the BIOS may try to access
> > + * the device even though it's already in D3 and hang the machine. So
> > + * leave the device in D0 on those platforms and hope the BIOS will
> > + * power down the device properly. Platforms where this was seen:
> > + * Lenovo Thinkpad X301, X61s
> > + */
> > + if (!(hibernation &&
> > + drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO &&
> > + INTEL_INFO(dev_priv)->gen == 4))
> > + pci_set_power_state(drm_dev->pdev, PCI_D3hot);
> >
> > return 0;
> > }
>
> I'll paste a DRAFT patch that fixes this for that X41 at the end of the
> message. The patch is rather ugly. Should we perhaps try a quirk table
> or something like that?
>
>
> Paul Bolle
>
> -------->8--------
> Subject: [PATCH] drm/i915: work around hang during hibernation on gen3 too
>
> Commit ab3be73fa7b4 ("drm/i915: gen4: work around hang during
> hibernation") was targetted at gen4 platforms shipped by Lenovo. The
> same problem can also be seen on a Lenovo ThinkPad X41. Expand the test
> to catch that system too.
>
> Sadly, this system still uses IBM's subsystem vendor id. So we end up
> with a rather unpleasant test. Use the IS_GEN3() and IS_GEN4() macros to
> lessen the pain a bit.
We had another bug report which showed similar problems on something
as recent as SNB:
https://bugzilla.kernel.org/show_bug.cgi?id=94241
So I guess we really want to make the check 'gen < 7'.
My IVB X1 Carbon doesn't need this quirk, so hopefully that indicates
the Lenovo BIOSen became more sane for gen7+.
>
> Not-yet-signed-off-by: Paul Bolle <pebolle@...cali.nl>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index cc6ea53d2b81..3a07164f5860 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -641,11 +641,12 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation)
> * the device even though it's already in D3 and hang the machine. So
> * leave the device in D0 on those platforms and hope the BIOS will
> * power down the device properly. Platforms where this was seen:
> - * Lenovo Thinkpad X301, X61s
> + * Lenovo Thinkpad X301, X61s, X41
> */
> if (!(hibernation &&
> - drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO &&
> - INTEL_INFO(dev_priv)->gen == 4))
> + (drm_dev->pdev->subsystem_vendor == PCI_VENDOR_ID_LENOVO ||
> + drm_dev->pdev->subsystem_vendor == PCI_SUBVENDOR_ID_IBM) &&
> + (IS_GEN3(dev_priv) || IS_GEN4(dev_priv))))
> pci_set_power_state(drm_dev->pdev, PCI_D3hot);
>
> return 0;
> --
> 2.1.0
--
Ville Syrjälä
Intel OTC
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