[Bug 108326] [BXT] BUG / system hang when reading i915 debugfs entries with VT-d/IOMMU enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108326

Eero Tamminen <eero.t.tamminen at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |VERIFIED

--- Comment #5 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Francesco Balestrieri from comment #4)
> Eero, is the issue resolved for you?

Tested on J4205, no GPU hang -> verified:
-----------------------------------------
# dmesg | grep -i iommu
[    0.505602] DMAR-IR: IOAPIC id 1 under DRHD base  0xfed65000 IOMMU 1
[    0.846760] iommu: Adding device 0000:00:00.0 to group 0
...
# cd /sys/kernel/debug/dri/0/
# head i915_* > /dev/null
head: error reading '/sys/kernel/debug/dri/0/i915_cache_sharing': No such
device
head: error reading '/sys/kernel/debug/dri/0/i915_drrs_ctl': Permission denied
head: error reading '/sys/kernel/debug/dri/0/i915_edp_psr_debug': No such
device
head: error reading '/sys/kernel/debug/dri/0/i915_emon_status': No such device
head: cannot open '/sys/kernel/debug/dri/0/i915_error_state' for reading: No
such device
head: error reading '/sys/kernel/debug/dri/0/i915_fbc_false_color': No such
device
head: error reading '/sys/kernel/debug/dri/0/i915_fbc_status': No such device
head: error reading '/sys/kernel/debug/dri/0/i915_fifo_underrun_reset': Invalid
argument
head: error reading '/sys/kernel/debug/dri/0/i915_forcewake_user': Invalid
argument
head: cannot open '/sys/kernel/debug/dri/0/i915_gpu_info' for reading: No such
device
head: error reading '/sys/kernel/debug/dri/0/i915_guc_info': No such device
head: error reading '/sys/kernel/debug/dri/0/i915_guc_log_level': No such
device
head: cannot open '/sys/kernel/debug/dri/0/i915_guc_log_relay' for reading: No
such device
head: error reading '/sys/kernel/debug/dri/0/i915_guc_stage_pool': No such
device
head: error reading '/sys/kernel/debug/dri/0/i915_ips_status': No such device
head: error reading '/sys/kernel/debug/dri/0/i915_ring_freq_table': No such
device
-----------------------------------------

Btw. I don't understand why i915 driver provides non-working debug info file
entries (I remember e.g. "i915_ring_freq_table" working earlier).

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