** Changed in: intel
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/2049793
Title:
[MTL] x86: Fix Cache info sysfs is not populated
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Noble:
Fix Released
Bug description:
[SRU Justification]
[Impact]
The interface /sys/devices/system/cpu/cpuX/cache is broken (not populated) if
CPUs have different numbers of subleaves in CPUID 4. This is the case of Intel
Meteor Lake.
[Fix]
https://lore.kernel.org/all/[email protected]/
Reviewed, but probably will only land in v6.9.
[Test Case]
Check existence of cpu cache info:
$ ls /sys/devices/system/cpu/cpu0/cache/
index0 index1 index2 index3 uevent
[Where problems could occur]
This populates sysfs entries that should have been available, not
something new or alters existing interface.
[Other Info]
While this is targets v6.8 for Intel LPMD (Low Power Model Daemon)'s
use, only Noble and Unstable will be nominated for fix.
========== original bug report ==========
[Description]
The interface /sys/devices/system/cpu/cpu*/cache is empty. In Meteorlake,
not all CPUs have the same number of subleaves in the CPUID 4 leaf. The compute
die CPUs have 3 subleaves whereas the CPUs in the SoC die have 2. This problem
happens because Linux assumes that all CPUs have the same number of subleaves.
[Hardware Information]
Architecture:
Intel / AMD (x86_64)
Platform(s):
Meteor Lake
Date HW is expected at Canonical:
Component(s):
x86
[Software Information]
Target Version:
24.04
Target Kernel:
6.8
Commit IDs:
TBD
External Links:
https://lore.kernel.org/all/[email protected]/
[Business Justification]
[Testing guidance]
[External ID]
LFE-6901
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