[Regression][3.4-rc3][intel-dri] MMIO read or write has been dropped ffffffff

[Maciej Rutecki]

Bad kernel: 3.4-rc3
Last known good: 3.3

Subsystem: dri-intel (guess)

Steps to reproduce:
1. Suspend to ram
2. Resume

After resume laptop works ok, but in dmesg I found:
[  164.098113] ------------[ cut here ]------------
[  164.098124] WARNING: at drivers/gpu/drm/i915/i915_drv.c:398 
gen6_gt_check_fifodbg.isra.6+0x31/0x43()
[  164.098126] Hardware name: 1141ALG
[  164.098128] MMIO read or write has been dropped ffffffff
[  164.098129] Modules linked in: xt_tcpudp xt_limit xt_state iptable_filter 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack ip_tables x_tables bnep rfcomm 
bluetooth uinput fuse loop sha256_generic aes_x86_64 aes_generic cbc dm_crypt 
dm_mod uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev 
usbhid hid media snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwlwifi 
mac80211 thinkpad_acpi cfg80211 coretemp nvram snd_hda_intel snd_hda_codec 
snd_hwdep snd_pcm snd_page_alloc snd_seq ehci_hcd sdhci_pci crc32c_intel 
iTCO_wdt iTCO_vendor_support ghash_clmulni_intel snd_seq_device cryptd 
snd_timer microcode snd acpi_cpufreq mperf usbcore psmouse sdhci r8169 
mmc_core mii ac rfkill i2c_i801 soundcore mei(C) serio_raw pcspkr thermal 
battery power_supply wmi usb_common evdev processor
[  164.098188] Pid: 4684, comm: kworker/u:9 Tainted: G         C   3.4.0-rc3 
#1
[  164.098189] Call Trace:
[  164.098197]  [<ffffffff8103aa3c>] warn_slowpath_common+0x7e/0x96
[  164.098200]  [<ffffffff8103aae8>] warn_slowpath_fmt+0x41/0x43
[  164.098203]  [<ffffffff812cbec7>] gen6_gt_check_fifodbg.isra.6+0x31/0x43
[  164.098207]  [<ffffffff812cc13b>] __gen6_gt_force_wake_put+0x19/0x1b
[  164.098210]  [<ffffffff812cc3cf>] i915_read32+0x66/0x9d
[  164.098213]  [<ffffffff812ce4fa>] i915_update_gfx_val+0x61/0xb9
[  164.098218]  [<ffffffff812e989f>] intel_idle_update+0x47/0x18d
[  164.098222]  [<ffffffff810520d7>] process_one_work+0x1b5/0x340
[  164.098225]  [<ffffffff8105203a>] ? process_one_work+0x118/0x340
[  164.098228]  [<ffffffff812e9858>] ? intel_disable_plane+0x60/0x60
[  164.098231]  [<ffffffff81052c63>] worker_thread+0xce/0x152
[  164.098234]  [<ffffffff81052b95>] ? manage_workers.isra.22+0x16a/0x16a
[  164.098237]  [<ffffffff810567c6>] kthread+0xa1/0xa9
[  164.098242]  [<ffffffff81080ea1>] ? trace_hardirqs_on+0xd/0xf
[  164.098246]  [<ffffffff8145d374>] kernel_thread_helper+0x4/0x10
[  164.098250]  [<ffffffff81456970>] ? retint_restore_args+0x13/0x13
[  164.098253]  [<ffffffff81056725>] ? __init_kthread_worker+0x55/0x55
[  164.098256]  [<ffffffff8145d370>] ? gs_change+0x13/0x13
[  164.098257] ---[ end trace 97bd0b679d161c3e ]---
[  164.098827] ------------[ cut here ]------------
[  164.098830] WARNING: at drivers/gpu/drm/i915/i915_drv.c:398 
gen6_gt_check_fifodbg.isra.6+0x31/0x43()
[  164.098832] Hardware name: 1141ALG
[  164.098833] MMIO read or write has been dropped ffffffff
[  164.098834] Modules linked in: xt_tcpudp xt_limit xt_state iptable_filter 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack ip_tables x_tables bnep rfcomm 
bluetooth uinput fuse loop sha256_generic aes_x86_64 aes_generic cbc dm_crypt 
dm_mod uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev 
usbhid hid media snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwlwifi 
mac80211 thinkpad_acpi cfg80211 coretemp nvram snd_hda_intel snd_hda_codec 
snd_hwdep snd_pcm snd_page_alloc snd_seq ehci_hcd sdhci_pci crc32c_intel 
iTCO_wdt iTCO_vendor_support ghash_clmulni_intel snd_seq_device cryptd 
snd_timer microcode snd acpi_cpufreq mperf usbcore psmouse sdhci r8169 
mmc_core mii ac rfkill i2c_i801 soundcore mei(C) serio_raw pcspkr thermal 
battery power_supply wmi usb_common evdev processor
[  164.098877] Pid: 4684, comm: kworker/u:9 Tainted: G        WC   3.4.0-rc3 
#1
[  164.098878] Call Trace:
[  164.098881]  [<ffffffff8103aa3c>] warn_slowpath_common+0x7e/0x96
[  164.098884]  [<ffffffff8103aae8>] warn_slowpath_fmt+0x41/0x43
[  164.098888]  [<ffffffff812cbec7>] gen6_gt_check_fifodbg.isra.6+0x31/0x43
[  164.098891]  [<ffffffff812cc13b>] __gen6_gt_force_wake_put+0x19/0x1b
[  164.098894]  [<ffffffff812cc3cf>] i915_read32+0x66/0x9d
[  164.098896]  [<ffffffff812e98f7>] intel_idle_update+0x9f/0x18d
[  164.098899]  [<ffffffff810520d7>] process_one_work+0x1b5/0x340
[  164.098902]  [<ffffffff8105203a>] ? process_one_work+0x118/0x340
[  164.098904]  [<ffffffff812e9858>] ? intel_disable_plane+0x60/0x60
[  164.098907]  [<ffffffff81052c63>] worker_thread+0xce/0x152
[  164.098910]  [<ffffffff81052b95>] ? manage_workers.isra.22+0x16a/0x16a
[  164.098913]  [<ffffffff810567c6>] kthread+0xa1/0xa9
[  164.098916]  [<ffffffff81080ea1>] ? trace_hardirqs_on+0xd/0xf
[  164.098918]  [<ffffffff8145d374>] kernel_thread_helper+0x4/0x10
[  164.098921]  [<ffffffff81456970>] ? retint_restore_args+0x13/0x13
[  164.098925]  [<ffffffff81056725>] ? __init_kthread_worker+0x55/0x55
[  164.098927]  [<ffffffff8145d370>] ? gs_change+0x13/0x13
[  164.098928] ---[ end trace 97bd0b679d161c3f ]---

I found similar report in:
https://bugzilla.redhat.com/show_bug.cgi?id=809773

Dmesg, config and lspci:
http://mrutecki.pl/download/kernel/3.4-rc3/dri_intel/

Regards
-- 
Maciej Rutecki
http://www.mrutecki.pl
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