linux-kernel - Re: [PATCH v2 0/5] Expose and manage PCI device reset

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Date:   Sat, 15 May 2021 06:29:42 +0530
From:   Amey Narkhede <ameynarkhede03@...il.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     alex.williamson@...hat.com, raphael.norwitz@...anix.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Krzysztof Wilczyński <kw@...ux.com>
Subject: Re: [PATCH v2 0/5] Expose and manage PCI device reset

On 21/04/10 12:53AM, Amey Narkhede wrote:
> 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

Hi Bjorn,
I guess as the merge window is closed this patch
won't get merged in 5.13. I was wondering if you
have any suggestions on this patch series so that I can
make changes meanwhile.

Thanks,
Amey