[resend/standalone PATCH v4] Add auxiliary bus support

[Greg KH]

On Wed, Dec 02, 2020 at 04:54:24PM -0800, Dan Williams wrote:
> From: Dave Ertman <david.m.ertman at intel.com>
> 
> Add support for the Auxiliary Bus, auxiliary_device and auxiliary_driver.
> It enables drivers to create an auxiliary_device and bind an
> auxiliary_driver to it.
> 
> The bus supports probe/remove shutdown and suspend/resume callbacks.
> Each auxiliary_device has a unique string based id; driver binds to
> an auxiliary_device based on this id through the bus.
> 
> Co-developed-by: Kiran Patil <kiran.patil at intel.com>
> Co-developed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
> Co-developed-by: Fred Oh <fred.oh at linux.intel.com>
> Co-developed-by: Leon Romanovsky <leonro at nvidia.com>
> Signed-off-by: Kiran Patil <kiran.patil at intel.com>
> Signed-off-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
> Signed-off-by: Fred Oh <fred.oh at linux.intel.com>
> Signed-off-by: Leon Romanovsky <leonro at nvidia.com>
> Signed-off-by: Dave Ertman <david.m.ertman at intel.com>
> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> Reviewed-by: Shiraz Saleem <shiraz.saleem at intel.com>
> Reviewed-by: Parav Pandit <parav at mellanox.com>
> Reviewed-by: Dan Williams <dan.j.williams at intel.com>
> Reviewed-by: Martin Habets <mhabets at solarflare.com>
> Link: https://lore.kernel.org/r/20201113161859.1775473-2-david.m.ertman@intel.com
> Signed-off-by: Dan Williams <dan.j.williams at intel.com>
> ---
> This patch is "To:" the maintainers that have a pending backlog of
> driver updates dependent on this facility, and "Cc:" Greg. Greg, I
> understand you have asked for more time to fully review this and apply
> it to driver-core.git, likely for v5.12, but please consider Acking it
> for v5.11 instead. It looks good to me and several other stakeholders.
> Namely, stakeholders that have pressure building up behind this facility
> in particular Mellanox RDMA, but also SOF, Intel Ethernet, and later on
> Compute Express Link.
> 
> I will take the blame for the 2 months of silence that made this awkward
> to take through driver-core.git, but at the same time I do not want to
> see that communication mistake inconvenience other parties that
> reasonably thought this was shaping up to land in v5.11.
> 
> I am willing to host this version at:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/djbw/linux tags/auxiliary-bus-for-5.11
> 
> ...for all the independent drivers to have a common commit baseline. It
> is not there yet pending Greg's Ack.

Here is now a signed tag for everyone else to pull from and build on top
of, for 5.11-rc1, that includes this patch, and the 3 others I sent in
this series.

Please let me know if anyone has any problems with this tag.  I'll keep
it around until 5.11-rc1 is released, after which it doesn't make any
sense to be there.

thanks,

greg k-h

---------------

The following changes since commit f8394f232b1eab649ce2df5c5f15b0e528c92091:

  Linux 5.10-rc3 (2020-11-08 16:10:16 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git tags/auxbus-5.11-rc1

for you to fetch changes up to 0d2bf11a6b3e275a526b8d42d8d4a3a6067cf953:

  driver core: auxiliary bus: minor coding style tweaks (2020-12-04 13:30:59 +0100)

----------------------------------------------------------------
Auxiliary Bus support tag for 5.11-rc1

This is a signed tag for other subsystems to be able to pull in the
auxiliary bus support into their trees for the 5.11-rc1 merge.

Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

----------------------------------------------------------------
Dave Ertman (1):
      Add auxiliary bus support

Greg Kroah-Hartman (3):
      driver core: auxiliary bus: move slab.h from include file
      driver core: auxiliary bus: make remove function return void
      driver core: auxiliary bus: minor coding style tweaks

 Documentation/driver-api/auxiliary_bus.rst | 234 ++++++++++++++++++++++++
 Documentation/driver-api/index.rst         |   1 +
 drivers/base/Kconfig                       |   3 +
 drivers/base/Makefile                      |   1 +
 drivers/base/auxiliary.c                   | 274 +++++++++++++++++++++++++++++
 include/linux/auxiliary_bus.h              |  77 ++++++++
 include/linux/mod_devicetable.h            |   8 +
 scripts/mod/devicetable-offsets.c          |   3 +
 scripts/mod/file2alias.c                   |   8 +
 9 files changed, 609 insertions(+)
 create mode 100644 Documentation/driver-api/auxiliary_bus.rst
 create mode 100644 drivers/base/auxiliary.c
 create mode 100644 include/linux/auxiliary_bus.h