linux-kernel - Re: [PATCH 0/5] Always build aspm.c

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Date: Mon, 29 Jan 2024 17:46:27 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: "David E. Box" <david.e.box@...ux.intel.com>
Cc: mika.westerberg@...ux.intel.com, ilpo.jarvinen@...ux.intel.com,
	bhelgaas@...gle.com, rjw@...ysocki.net, tasev.stefanoska@...net.be,
	enriquezmark36@...il.com, kernel@...t.link, wse@...edocomputers.com,
	vidyas@...dia.com, kai.heng.feng@...onical.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com, ricky_wu@...ltek.com,
	mario.limonciello@....com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Always build aspm.c

On Sun, Jan 28, 2024 at 03:32:07PM -0800, David E. Box wrote:
> Here is the series to always build aspm.c, add back L1SS save/restore, and
> consolidate all ASPM related code in aspm.c.
> 
> Patch 1 - Moves all PCI core functions running under CONFIG_PCIEASPM into
> aspm.c and changes they Makefile to always build it. No functional changes.
> 
> Patch 2 - Creates a separate function to save the L1SS offset and places it
> outside of CONFIG_PCIEASPM in aspm.c so that the offset is available for
> later use by the L1SS save/restore code which needs to run when
> CONFIG_PCIEASPM=n.
> 
> Patch 3 - Updated L1 Substate save/restore patch from previous V5 [1].
> 
> Patch 4 - Moves the LTR save/restore state functions into aspm.c outside of
> CONFIG_PCIEASPM.
> 
> Patch 5 - Moves the LTR save/restore state calls into
> pci_save/restore_pcie_state().
> 
> The series does not continue any of the ASPM robustness changes proposed by
> Ilpo [2]. But if we think it's worth combining with this series I can
> add it and help continue the work.
> 
> [1] https://lore.kernel.org/linux-pci/20231221011250.191599-1-david.e.box@linux.intel.com/
> [2] https://lore.kernel.org/linux-pci/20230918131103.24119-1-ilpo.jarvinen@linux.intel.com/
> 
> David E. Box (5):
>   PCI: Always build aspm.c
>   PCI: Create function to save L1SS offset
>   PCI/ASPM: Add back L1 PM Substate save and restore
>   PCI: Move pci_save/restore_ltr_state() to aspm.c
>   PCI: Call LTR save/restore state from PCIe save/restore
> 
>  drivers/pci/pci.c         |  91 ++++----------
>  drivers/pci/pci.h         |  10 +-
>  drivers/pci/pcie/Makefile |   2 +-
>  drivers/pci/pcie/aspm.c   | 257 ++++++++++++++++++++++++++++++++++++--
>  drivers/pci/probe.c       |  62 +--------
>  include/linux/pci.h       |   4 +-
>  6 files changed, 283 insertions(+), 143 deletions(-)
> 
> 
> base-commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a

Rebased to v6.8-rc1 and applied to pci/aspm for v6.9, thanks!