[Bug 67813] [HSW bisected]igt/module_reload causes [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44004 and system hang with headless, with power well disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67813

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #60 from lu hua <huax.lu at intel.com> ---
Test on latest -nightly kernel, i915 is in use. Test on latest -queued kernel,
error still exists.
output(nightly kernel)
rmmod: ERROR: Module i915 is in use
WARNING: i915.ko still loaded!
module successfully loaded again

lsmod(nightly kenrel)
Module                  Size  Used by
snd_hda_intel          15258  0
ip6table_filter         1067  0
ip6_tables             13864  1 ip6table_filter
ipv6                  253295  24
iptable_filter          1112  0
ip_tables              13467  1 iptable_filter
ebtable_nat             1529  0
ebtables               19258  1 ebtable_nat
x_tables               13403  5
ip6table_filter,ip_tables,iptable_filter,ebtables,ip6_tables
dm_mod                 67053  0
snd_hda_codec_realtek    46034  1
snd_hda_codec_generic    38382  1 snd_hda_codec_realtek
iTCO_wdt                4695  0
iTCO_vendor_support     1624  1 iTCO_wdt
snd_hda_codec_hdmi     31910  1
serio_raw               3929  0
pcspkr                  1715  0
i2c_i801                8397  0
lpc_ich                13312  0
mfd_core                2537  1 lpc_ich
snd_hda_controller     16013  1 snd_hda_intel
snd_hda_codec          71968  5
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_hwdep               5309  1 snd_hda_codec
snd_pcm                69054  4
snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
snd_timer              15325  1 snd_pcm
snd                    49512  8
snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
soundcore               4178  2 snd,snd_hda_codec
battery                12312  0
wmi                     6915  0
tpm_infineon            6274  0
tpm_tis                 6884  0
tpm                    18810  2 tpm_tis,tpm_infineon
acpi_cpufreq            5906  0
i915                  720378  3
video                  11915  1 i915
button                  4229  1 i915
drm_kms_helper         27746  1 i915
drm                   206876  3 i915,drm_kms_helper

Test on latest -queued kernel:
output:
module successfully unloaded
module successfully loaded again

dmesg -r | egrep "<[1-3]>" |grep drm
<3>[   31.720889] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed
register before writing to 209c
<3>[   31.726335] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed
register before writing to a090
<3>[   31.945258] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed
register before writing to a090
<3>[   31.951119] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed
register before writing to 45404

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