[PATCH v7 0/5] PCI/ASPM: Add sysfs attributes for controlling ASPM

[Heiner Kallweit <hkallweit1@gmail.com>]

Background of this extension is a problem with the r8169 network driver.
Several combinations of board chipsets and network chip versions have
problems if ASPM is enabled, therefore we have to disable ASPM per
default. However especially on notebooks ASPM can provide significant
power-saving, therefore we want to give users the option to enable
ASPM. With the new sysfs attributes users can control which ASPM
link-states are disabled.

v2:
- use a dedicated sysfs attribute per link state
- allow separate control of ASPM and PCI PM L1 sub-states

v3:
- patch 3: statically allocate the attribute group
- patch 3: replace snprintf with printf
- add patch 4

v4:
- patch 3: add call to sysfs_update_group because is_visible callback
           returns false always at file creation time
- patch 3: simplify code a little

v5:
- rebased to latest pci/next

v6:
- patch 3: consider several review comments from Bjorn
- patch 4: add discussion link to commit message

v7:
- Move adding pcie_aspm_get_link() to separate patch 3
- patch 4: change group name from aspm to link_pm
- patch 4: control visibility of attributes individually

Heiner Kallweit (5):
  PCI/ASPM: add L1 sub-state support to pci_disable_link_state
  PCI/ASPM: allow to re-enable Clock PM
  PCI/ASPM: Add and use helper pcie_aspm_get_link
  PCI/ASPM: Add sysfs attributes for controlling ASPM link states
  PCI/ASPM: Remove Kconfig option PCIEASPM_DEBUG and related code

 Documentation/ABI/testing/sysfs-bus-pci |  14 ++
 drivers/pci/pci-sysfs.c                 |   6 +-
 drivers/pci/pci.h                       |  12 +-
 drivers/pci/pcie/Kconfig                |   7 -
 drivers/pci/pcie/aspm.c                 | 252 ++++++++++++++++--------
 include/linux/pci.h                     |  10 +-
 6 files changed, 199 insertions(+), 102 deletions(-)

-- 
2.23.0