Commits
Chris Wilson committed ec7ce653d9f
drm/i915: Only shrink the unbound objects during freeze
At the point of creating the hibernation image, the runtime power manage
core is disabled - and using the rpm functions triggers a warn.
i915_gem_shrink_all() tries to unbind objects, which requires device
access and so tries to how an rpm reference triggering a warning:
[ 44.235420] ------------[ cut here ]------------
[ 44.235424] WARNING: CPU: 2 PID: 2199 at drivers/gpu/drm/i915/intel_runtime_pm.c:2688 intel_runtime_pm_get_if_in_use+0xe6/0xf0
[ 44.235426] WARN_ON_ONCE(ret < 0)
[ 44.235445] Modules linked in: ctr ccm arc4 rt2800usb rt2x00usb rt2800lib rt2x00lib crc_ccitt mac80211 cmac cfg80211 btusb rfcomm bnep btrtl btbcm btintel bluetooth dcdbas x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic aesni_intel snd_hda_codec_hdmi aes_x86_64 lrw gf128mul snd_hda_intel glue_helper ablk_helper cryptd snd_hda_codec hid_multitouch joydev snd_hda_core binfmt_misc i2c_hid serio_raw snd_pcm acpi_pad snd_timer snd i2c_designware_platform 8250_dw nls_iso8859_1 i2c_designware_core lpc_ich mfd_core soundcore usbhid hid psmouse ahci libahci
[ 44.235447] CPU: 2 PID: 2199 Comm: kworker/u8:8 Not tainted 4.8.0-rc5+ #130
[ 44.235447] Hardware name: Dell Inc. XPS 13 9343/0310JH, BIOS A07 11/11/2015
[ 44.235450] Workqueue: events_unbound async_run_entry_fn
[ 44.235453] 0000000000000000 ffff8801b2f7fb98 ffffffff81306c2f ffff8801b2f7fbe8
[ 44.235454] 0000000000000000 ffff8801b2f7fbd8 ffffffff81056c01 00000a801f50ecc0
[ 44.235456] ffff88020ce50000 ffff88020ce59b60 ffffffff81a60b5c ffffffff81414840
[ 44.235456] Call Trace:
[ 44.235459] [<ffffffff81306c2f>] dump_stack+0x4d/0x6e
[ 44.235461] [<ffffffff81056c01>] __warn+0xd1/0xf0
[ 44.235464] [<ffffffff81414840>] ? i915_pm_suspend_late+0x30/0x30
[ 44.235465] [<ffffffff81056c6f>] warn_slowpath_fmt+0x4f/0x60
[ 44.235468] [<ffffffff814e73ce>] ? pm_runtime_get_if_in_use+0x6e/0xa0
[ 44.235469] [<ffffffff81433526>] intel_runtime_pm_get_if_in_use+0xe6/0xf0
[ 44.235471] [<ffffffff81458a26>] i915_gem_shrink+0x306/0x360
[ 44.235473] [<ffffffff81343fd4>] ? pci_platform_power_transition+0x24/0x90
[ 44.235475] [<ffffffff81414840>] ? i915_pm_suspend_late+0x30/0x30
[ 44.235476] [<ffffffff81458dfb>] i915_gem_shrink_all+0x1b/0x30
[ 44.235478] [<ffffffff814560b3>] i915_gem_freeze_late+0x33/0x90
[ 44.235479] [<ffffffff81414877>] i915_pm_freeze_late+0x37/0x40
[ 44.235481] [<ffffffff814e9b8e>] dpm_run_callback+0x4e/0x130
[ 44.235483] [<ffffffff814ea5db>] __device_suspend_late+0xdb/0x1f0
[ 44.235484] [<ffffffff814ea70f>] async_suspend_late+0x1f/0xa0
[ 44.235486] [<ffffffff81077557>] async_run_entry_fn+0x37/0x150
[ 44.235488] [<ffffffff8106f518>] process_one_work+0x148/0x3f0
[ 44.235490] [<ffffffff8106f8eb>] worker_thread+0x12b/0x490
[ 44.235491] [<ffffffff8106f7c0>] ? process_one_work+0x3f0/0x3f0
[ 44.235492] [<ffffffff81074d09>] kthread+0xc9/0xe0
[ 44.235495] [<ffffffff816e257f>] ret_from_fork+0x1f/0x40
[ 44.235496] [<ffffffff81074c40>] ? kthread_park+0x60/0x60
[ 44.235497] ---[ end trace e438706b97c7f132 ]---
Alternatively, to actually shrink everything we have to do so slightly
earlier in the hibernation process.
To keep lockdep silent, we need to take struct_mutex for the shrinker
even though we know that we are the only user during the freeze.
Fixes: 7aab2d534e35 ("drm/i915: Shrink objects prior to hibernation")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160921135108.29574-2-chris@chris-wilson.co.uk
(cherry picked from commit 6a800eabba34945c2986d70114b41d564bad52a8)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>