Date:	Wed, 23 Dec 2015 12:50:35 +0100
From:	Sylvain Munaut <s.munaut@...tever-company.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Ben Widawsky <benjamin.widawsky@...el.com>,
	intel-gfx@...ts.freedesktop.org
Subject: Suspend To RAM failure in >= 4.1 - bissected to "drm/i915: Track GEN6
 page table usage"

Hi,


When trying to upgrade my kernel yesterday to the latest 4.3.3 I
noticed that the suspend to ram was not working. Basically it goes to
sleep but never wakes up. It seems to power up but no screen, not
available through ssh either and afaict nothing runs afterwards.

I first tried a couple official release to see where it broke and I
found that 4.0.9 was working fine, but 4.1.15 was not.

I then ran a git bissect between v4.0 and v4.1 from Linus's tree and
found the "guilty" commit was

commit 317b4e903636305cfe702ab3e5b3d68547a69e72
Author: Ben Widawsky <benjamin.widawsky@...el.com>
Date:   Mon Mar 16 16:00:55 2015 +0000

    drm/i915: Extract context switch skip and add pd load logic


Here's the full log :

git bisect start
# bad: [b953c0d234bc72e8489d3bf51a276c5c4ec85345] Linux 4.1
git bisect bad b953c0d234bc72e8489d3bf51a276c5c4ec85345
# good: [39a8804455fb23f09157341d3ba7db6d7ae6ee76] Linux 4.0
git bisect good 39a8804455fb23f09157341d3ba7db6d7ae6ee76
# good: [d0a3997c0c3f9351e24029349dee65dd1d9e8d84] Merge tag
'sound-4.1-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good d0a3997c0c3f9351e24029349dee65dd1d9e8d84
# bad: [cf82f52d3619d2e15c83ec9a03c6ce8cdf6c6b58] watchdog:
stmp3xxx_rtc_wdt: fix broken email address
git bisect bad cf82f52d3619d2e15c83ec9a03c6ce8cdf6c6b58
# good: [79319a052cb0ae862954fe9f6e606417f1698ddb] Merge tag
'iommu-updates-v4.1' of
git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
git bisect good 79319a052cb0ae862954fe9f6e606417f1698ddb
# bad: [8f443e2372ba23d51ee365974f54507acd6f69d1] Revert "ocfs2:
incorrect check for debugfs returns"
git bisect bad 8f443e2372ba23d51ee365974f54507acd6f69d1
# bad: [3165c074175cddab1dcfd553042ea4f363bc76e7] drm/i915: Use atomic
state in intel_ddi_crtc_get_new_encoder()
git bisect bad 3165c074175cddab1dcfd553042ea4f363bc76e7
# good: [8dd0eb3566711d81bfbe2b4421b33f0dd723cec4] Merge tag
'drm-intel-next-2015-02-27' of git://anongit.freedesktop.org/drm-intel
into drm-next
git bisect good 8dd0eb3566711d81bfbe2b4421b33f0dd723cec4
# good: [5704195c3f3c04a00c16334a033b180f16db1f94] drm/i915/skl:
Updated the gen6_set_rps function
git bisect good 5704195c3f3c04a00c16334a033b180f16db1f94
# good: [07749ef32c4fd60334c2451739460dd1cf600281] drm/i915: page
table generalizations
git bisect good 07749ef32c4fd60334c2451739460dd1cf600281
# bad: [58072ccbb81c6f2d67c5b4cc7597707c4fb86a5e] drm/i915: fix race
when clearing RPS IIR bits
git bisect bad 58072ccbb81c6f2d67c5b4cc7597707c4fb86a5e
# bad: [48fe4691ae639e60fda37faf06dccdff60245149] drm/i915: Eliminate
plane control register RMW from sprite code
git bisect bad 48fe4691ae639e60fda37faf06dccdff60245149
# bad: [bdd7554d568fa165b0e86fc32b1cde3c895ff774] drm/i915: Kill
intel_plane->obj
git bisect bad bdd7554d568fa165b0e86fc32b1cde3c895ff774
# bad: [678d96fbb3b5995a2fdff2bca5e1ab4a40b7e968] drm/i915: Track GEN6
page table usage
git bisect bad 678d96fbb3b5995a2fdff2bca5e1ab4a40b7e968
# good: [317b4e903636305cfe702ab3e5b3d68547a69e72] drm/i915: Extract
context switch skip and add pd load logic
git bisect good 317b4e903636305cfe702ab3e5b3d68547a69e72
# first bad commit: [678d96fbb3b5995a2fdff2bca5e1ab4a40b7e968]
drm/i915: Track GEN6 page table usage


The machine is a Lenovo T440s laptop :


00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
Integrated Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:16.3 Serial controller: Intel Corporation 8 Series HECI KT (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection
I218-LM (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 6 (rev e4)
00:1c.1 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4)
00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1
[AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS5227 PCI Express Card Reader (rev 01)
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)
04:00.0 VGA compatible controller: NVIDIA Corporation GK208M [GeForce
GT 730M] (rev a1)


Cheers,

    Sylvain Munaut
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