APPLIED[M]: [SRU] [L/M/Unstable] [PATCH 0/9] Enable ASPM for NVMe behind VMD

[Andrea Righi]

On Wed, Sep 06, 2023 at 03:54:12PM +0800, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/2034504
> 
> [Impact]
> ASPM of NVMe behind VMD is not enabled when BIOS FADT doesn't allow ASPM
> to be modified.
> That causes higher overall power consumption.
> 
> [Fix]
> Allow ASPM to be enabled.
> While at this, remove old cruft that can interfere upstream VMD driver.
> 
> [Test]
> Check the value of `/sys/kernel/debug/pmc_core/slp_s0_residency_usec`.
> Now system can reach deepest power saving state during sleep.
> 
> [Where problems could occur]
> Some NVMe may have I/O issue when ASPM is enabled. But for this scenario
> the issue will also appear when VMD is disabled.
> 
> David E. Box (3):
>   PCI: vmd: Use PCI_VDEVICE in device list
>   PCI: vmd: Create feature grouping for client products
>   PCI: vmd: Add quirk to configure PCIe ASPM and LTR
> 
> Kai-Heng Feng (5):
>   Revert "UBUNTU: SAUCE: vmd: fixup bridge ASPM by driver name instead"
>   Revert "UBUNTU: SAUCE: PCI/ASPM: Enable LTR for endpoints behind VMD"
>   Revert "UBUNTU: SAUCE: PCI/ASPM: Enable ASPM for links under VMD
>     domain"
>   UBUNTU: SAUCE: PCI/ASPM: Allow ASPM override over FADT default
>   UBUNTU: SAUCE: PCI: vmd: Mark ASPM override for device behind VMD
>     bridge

Applied to mantic/linux.

Thanks,
-Andrea