linux-kernel - Re: [PATCH v7 0/5] PCI/ASPM: Save/restore L1 PM Substates for suspend/resume

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Date: Thu, 7 Mar 2024 16:25:45 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: linux-pci@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"David E . Box" <david.e.box@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Tasev Nikola <tasev.stefanoska@...net.be>,
	Mark Enriquez <enriquezmark36@...il.com>,
	Thomas Witt <kernel@...t.link>,
	Werner Sembach <wse@...edocomputers.com>,
	Vidya Sagar <vidyas@...dia.com>,
	Kai-Heng Feng <kai.heng.feng@...onical.com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Ricky Wu <ricky_wu@...ltek.com>,
	Mario Limonciello <mario.limonciello@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Koba Ko <koba.ko@...onical.com>
Subject: Re: [PATCH v7 0/5] PCI/ASPM: Save/restore L1 PM Substates for
 suspend/resume

[+cc Koba Ko]

On Tue, Mar 05, 2024 at 03:46:56PM -0600, Bjorn Helgaas wrote:
> On Fri, Feb 23, 2024 at 02:58:46PM -0600, Bjorn Helgaas wrote:
> > From: Bjorn Helgaas <bhelgaas@...gle.com>
> > 
> > This is some rework of David's series to preserve ASPM L1 substate
> > configuration across suspend/resume.
> > ...

> > David E. Box (5):
> >   PCI/ASPM: Move pci_configure_ltr() to aspm.c
> >   PCI/ASPM: Always build aspm.c
> >   PCI/ASPM: Move pci_save_ltr_state() to aspm.c
> >   PCI/ASPM: Save L1 PM Substates Capability for suspend/resume
> >   PCI/ASPM: Call pci_save_ltr_state() from pci_save_pcie_state()
> > 
> >  drivers/pci/pci.c         |  89 ++++------------
> >  drivers/pci/pci.h         |  13 ++-
> >  drivers/pci/pcie/Makefile |   2 +-
> >  drivers/pci/pcie/aspm.c   | 215 ++++++++++++++++++++++++++++++++++++++
> >  drivers/pci/probe.c       |  62 +----------
> >  include/linux/pci.h       |   2 +-
> >  6 files changed, 252 insertions(+), 131 deletions(-)
> 
> I applied these as pci/aspm for v6.9, replacing the original unlabeled
> v6 that has been in -next.

Would anybody be able to test this, particularly to make sure it works
for the bugs we're claiming to fix with this series?

  https://bugzilla.kernel.org/show_bug.cgi?id=217321
  https://bugzilla.kernel.org/show_bug.cgi?id=216782
  https://bugzilla.kernel.org/show_bug.cgi?id=216877

This series is headed for v6.9, and I hope we can finally claim
victory over these issues.

This is in -next as of the Mar 7 tree.  Or if you want just the ASPM
changes, based on v6.8-rc1, you can use the branch at
https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/log/?h=aspm

Bjorn