[RESEND,v2,0/7] Expose and manage PCI device reset

Message

ameynarkhede03 May 19, 2021, 11:54 p.m. UTC

[RESEND with Shanker's patches as those depend on this series]

PCI and PCIe devices may support a number of possible reset mechanisms
for example Function Level Reset (FLR) provided via Advanced Feature or
PCIe capabilities, Power Management reset, bus reset, or device specific reset.
Currently the PCI subsystem creates a policy prioritizing these reset methods
which provides neither visibility nor control to userspace.

Expose the reset methods available per device to userspace, via sysfs
and allow an administrative user or device owner to have ability to
manage per device reset method priorities or exclusions.
This feature aims to allow greater control of a device for use cases
as device assignment, where specific device or platform issues may
interact poorly with a given reset method, and for which device specific
quirks have not been developed.

Changes in v2:
	- Use byte array instead of bitmap to keep track of
	  ordering of reset methods
	- Fix incorrect use of reset_fn field in octeon driver
	- Allow writing comma separated list of names of supported reset
	  methods to reset_method sysfs attribute
	- Writing empty string instead of "none" to reset_method attribute
	  disables ability of reset the device

Sending Raphael's patch again as this series depends on it.


Amey Narkhede (4):
  PCI: Add pcie_reset_flr to follow calling convention of other reset
    methods
  PCI: Add new array for keeping track of ordering of reset methods
  PCI: Remove reset_fn field from pci_dev
  PCI/sysfs: Allow userspace to query and set device reset mechanism

Raphael Norwitz (1):
  PCI: merge slot and bus reset implementations

Shanker Donthineni (2):
  PCI: Add support for a function level reset based on _RST method
  PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs

 Documentation/ABI/testing/sysfs-bus-pci       |  16 ++
 drivers/crypto/cavium/nitrox/nitrox_main.c    |   4 +-
 .../ethernet/cavium/liquidio/lio_vf_main.c    |   2 +-
 drivers/pci/pci-sysfs.c                       |  93 +++++++-
 drivers/pci/pci.c                             | 206 +++++++++++-------
 drivers/pci/pci.h                             |  10 +-
 drivers/pci/pcie/aer.c                        |  12 +-
 drivers/pci/probe.c                           |   4 +-
 drivers/pci/quirks.c                          |  23 +-
 include/linux/pci.h                           |  11 +-
 10 files changed, 278 insertions(+), 103 deletions(-)

--
2.31.1