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<body><span class="vcard"><a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> <span class="fn">Eero Tamminen</span></a>
</span> changed
<a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [BXT] BUG / system hang when reading i915 debugfs entries with VT-d/IOMMU enabled"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108326">bug 108326</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>VERIFIED
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<b><a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [BXT] BUG / system hang when reading i915 debugfs entries with VT-d/IOMMU enabled"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108326#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [BXT] BUG / system hang when reading i915 debugfs entries with VT-d/IOMMU enabled"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108326">bug 108326</a>
from <span class="vcard"><a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> <span class="fn">Eero Tamminen</span></a>
</span></b>
<pre>(In reply to Francesco Balestrieri from <a href="show_bug.cgi?id=108326#c4">comment #4</a>)
<span class="quote">> Eero, is the issue resolved for you?</span >
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).</pre>
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