linux-kernel - Re: [resend/standalone PATCH v4] Add auxiliary bus support

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Date:   Fri, 4 Dec 2020 13:59:22 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Leon Romanovsky <leonro@...dia.com>
Cc:     Dan Williams <dan.j.williams@...el.com>, broonie@...nel.org,
        lgirdwood@...il.com, davem@...emloft.net, kuba@...nel.org,
        jgg@...dia.com, Kiran Patil <kiran.patil@...el.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Fred Oh <fred.oh@...ux.intel.com>,
        Dave Ertman <david.m.ertman@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Parav Pandit <parav@...lanox.com>,
        Martin Habets <mhabets@...arflare.com>,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [resend/standalone PATCH v4] Add auxiliary bus support

On Fri, Dec 04, 2020 at 02:32:07PM +0200, Leon Romanovsky wrote:
> On Fri, Dec 04, 2020 at 12:42:46PM +0100, Greg KH wrote:
> > On Wed, Dec 02, 2020 at 04:54:24PM -0800, Dan Williams wrote:
> > > From: Dave Ertman <david.m.ertman@...el.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@...el.com>
> > > Co-developed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
> > > Co-developed-by: Fred Oh <fred.oh@...ux.intel.com>
> > > Co-developed-by: Leon Romanovsky <leonro@...dia.com>
> > > Signed-off-by: Kiran Patil <kiran.patil@...el.com>
> > > Signed-off-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
> > > Signed-off-by: Fred Oh <fred.oh@...ux.intel.com>
> > > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > > Signed-off-by: Dave Ertman <david.m.ertman@...el.com>
> > > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> > > Reviewed-by: Shiraz Saleem <shiraz.saleem@...el.com>
> > > Reviewed-by: Parav Pandit <parav@...lanox.com>
> > > Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> > > Reviewed-by: Martin Habets <mhabets@...arflare.com>
> > > Link: https://lore.kernel.org/r/20201113161859.1775473-2-david.m.ertman@intel.com
> > > Signed-off-by: Dan Williams <dan.j.williams@...el.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.
> > >
> > > For example implementations incorporating this patch, see Dave Ertman's
> > > SOF series:
> > >
> > > https://lore.kernel.org/r/20201113161859.1775473-2-david.m.ertman@intel.com
> > >
> > > ...and Leon's mlx5 series:
> > >
> > > http://lore.kernel.org/r/20201026111849.1035786-1-leon@kernel.org
> > >
> > > PS: Greg I know I promised some review on newcomer patches to help with
> > > your queue, unfortunately Intel-internal review is keeping my plate
> > > full. Again, I do not want other stakeholder to be waiting on me to
> > > resolve that backlog.
> >
> > Ok, I spent some hours today playing around with this.  I wrote up a
> > small test-patch for this (how did anyone test this thing???).
> 
> We are running all verifications tests that we have over our
> mlx5 driver. It includes devices reloads, power failures, FW
> reconfiguration to emulate different devices with and without error
> injections and many more. Up till now, no new bugs that are not known
> to us were found.

Yes, sorry, I was implying that the authors here had to create _some_
code to test this with, it would have been nice to include that as well
here.  We are collecting more and more in-kernel tests, having one for
this code would be nice to also have so we make sure not to break any
functionality in the future.

thanks,

greg k-h