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

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Message-Id: <20240128233212.1139663-1-david.e.box@linux.intel.com>
Date: Sun, 28 Jan 2024 15:32:07 -0800
From: "David E. Box" <david.e.box@...ux.intel.com>
To: mika.westerberg@...ux.intel.com,
	david.e.box@...ux.intel.com,
	ilpo.jarvinen@...ux.intel.com,
	bhelgaas@...gle.com,
	rjw@...ysocki.net
Cc: 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: [PATCH 0/5] Always build aspm.c

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
-- 
2.34.1