[Bug 220421] New: intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[Bug 220421] New: intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220421

            Bug ID: 220421
           Summary: intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU
                    telem endpoint -6
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: mapengyu@gmail.com
        Regression: No

Created attachment 308460
  --> https://bugzilla.kernel.org/attachment.cgi?id=308460&action=edit
p16g4-6.16-intel-arl-pmc-error-dmesg.txt

- CPU: Intel(R) Core(TM) Ultra 5 225H

- Kernel version (v6.16)

- Exact hardware model (ThinkPad P16s Gen 4)

- Steps to reproduce (Boot up and check dmesg)

- Relevant dmesg output is attached.

Error log:
[    6.619085] intel_pmc_core INT33A1:00: Assuming a default substate order for
this platform
[    6.619106] intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem
endpoint -6
[    6.619274] intel_pmc_core INT33A1:00:  initialized

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[Bug 220421] intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220421

--- Comment #1 from Pengyu Ma (mapengyu@gmail.com) ---
# cat /sys/kernel/debug/pmc_core/package_cstate_show 
Package C2 : 60519086
Package C3 : 51104
Package C6 : 24033407
Package C7 : 0
Package C8 : 17088008
Package C9 : 0
Package C10 : 1737082331
# cat /sys/kernel/debug/pmc_core/slp_s0_residency_usec
0

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[Bug 220421] intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220421

--- Comment #2 from Pengyu Ma (mapengyu@gmail.com) ---
# ls /sys/kernel/debug/pmc_core/
lpm_latch_mode  package_cstate_show             substate_requirements
ltr_ignore      pch_ip_power_gating_status      substate_residencies
ltr_restore     slp_s0_residency_usec           substate_status_registers
ltr_show        substate_live_status_registers

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[Bug 220421] intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220421

David Box (david.e.box@linux.intel.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |david.e.box@linux.intel.com

--- Comment #3 from David Box (david.e.box@linux.intel.com) ---
Looks like the firmware was updated after the driver was released so the driver
is using an outdated value for the DMU GUID. This issue won't prevent the
pmc_core driver from loading but will prevent it from providing a file to
access the Die C6 counter which is useful for PM debugging. We will send a
patch to update this after testing and notify here. Thanks.

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[Bug 220421] intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220421

--- Comment #4 from David Box (david.e.box@linux.intel.com) ---
Patch submitted upstream

https://lore.kernel.org/platform-driver-x86/20250814195156.628714-1-xi.pardee@linux.intel.com/#R

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[Bug 220421] intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -6

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220421

--- Comment #5 from Pengyu Ma (mapengyu@gmail.com) ---
@David Thank you very much.

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