[Bug 2085092] Re: System hang when running memory/memory_stress_ng test

** Description changed:

[Impact]
memory/memory_stress_ng test failed when swapping due to the ASPM issue with VMD device.

[Fix]
- Backport the Endlessos's patchset from https://lore.kernel.org (has been reviewed):
+ Backport the two of the three patches from Endlessos's patchset linux-next:

- Link: https://lore.kernel.org/linux-
- pci/20241001083438.10070-2-jhp@endlessos.org/
-
- [PATCH v12 0/3] PCI: vmd: Enable PCI PM's L1 substates of remapped PCIe Root Port and NVMe
+ [PATCH v12 0/3] PCI: vmd: Enable PCI PM's L1 substates of remapped PCIe Root Port and NVMe
[PATCH v12 1/3] PCI: vmd: Set PCI devices to D0 before enable PCI PM's L1 substates
[PATCH v12 2/3] PCI/ASPM: Add notes about enabling PCI-PM L1SS to pci_enable_link_state(_locked)
- [PATCH v12 3/3] PCI/ASPM: Make pci_save_aspm_l1ss_state save both child and parent's L1SS configuration
+
+ The third patch in the patchset isn't merged, but it doesn't have an
+ effect on our side.

[Test Plan]
1. Boot up Ubuntu OS
2. $ checkbox-cli run com.canonical.certification::stress/store_and_change_oomd_config
3. $ checkbox-cli run com.canonical.certification::memory/memory_stress_ng

[Where problems could occur]
May cause ASPM regression.

** Description changed:

[Impact]
memory/memory_stress_ng test failed when swapping due to the ASPM issue with VMD device.

[Fix]
- Backport the two of the three patches from Endlessos's patchset linux-next:
+ Backport the two patches from linux-next fixes the issue:

- [PATCH v12 0/3] PCI: vmd: Enable PCI PM's L1 substates of remapped PCIe Root Port and NVMe
- [PATCH v12 1/3] PCI: vmd: Set PCI devices to D0 before enable PCI PM's L1 substates
- [PATCH v12 2/3] PCI/ASPM: Add notes about enabling PCI-PM L1SS to pci_enable_link_state(_locked)
-
- The third patch in the patchset isn't merged, but it doesn't have an
- effect on our side.
+ d66041063192 PCI: vmd: Set devices to D0 before enabling PM L1 Substates
+ e1714f3b1f4d PCI/ASPM: Add notes about enabling PCI-PM L1SS to pci_enable_link_state(_locked)

[Test Plan]
1. Boot up Ubuntu OS
2. $ checkbox-cli run com.canonical.certification::stress/store_and_change_oomd_config
3. $ checkbox-cli run com.canonical.certification::memory/memory_stress_ng

[Where problems could occur]
May cause ASPM regression.

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https://bugs.launchpad.net/bugs/2085092

Title:
System hang when running memory/memory_stress_ng test

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Noble:
In Progress

Bug description:
[Impact]
memory/memory_stress_ng test failed when swapping due to the ASPM issue with VMD device.

[Fix]
Backport the two patches from linux-next fixes the issue:

d66041063192 PCI: vmd: Set devices to D0 before enabling PM L1 Substates
e1714f3b1f4d PCI/ASPM: Add notes about enabling PCI-PM L1SS to pci_enable_link_state(_locked)

[Test Plan]
1. Boot up Ubuntu OS
2. $ checkbox-cli run com.canonical.certification::stress/store_and_change_oomd_config
3. $ checkbox-cli run com.canonical.certification::memory/memory_stress_ng

[Where problems could occur]
May cause ASPM regression.

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