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
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 | 176 ++++++++++--------
drivers/pci/pci.h | 10 +-
drivers/pci/pcie/aer.c | 12 +-
drivers/pci/probe.c | 4 +-
drivers/pci/quirks.c | 11 +-
include/linux/pci.h | 11 +-
10 files changed, 236 insertions(+), 103 deletions(-)
--
2.31.1
