linux-kernel - Re: [PATCH v6 00/16] remoteproc: Add support for detaching a remote processor

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Message-ID: <20210301185854.GD3690389@xps15>
Date:   Mon, 1 Mar 2021 11:58:54 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        arnaud.pouliquen@...com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 00/16] remoteproc: Add support for detaching a remote
 processor

On Fri, Feb 26, 2021 at 05:40:49PM +0100, Arnaud POULIQUEN wrote:
> Hi Mathieu,
> 
> On 2/24/21 12:34 AM, Mathieu Poirier wrote:
> > Following the work done here [1], this set provides support for the
> > remoteproc core to release resources associated with a remote processor
> > without having to switch it off. That way a platform driver can be removed
> > or the application processor power cycled while the remote processor is
> > still operating.
> > 
> > Modifications for this revision are detailed in the changelog of each patch
> > but the main difference is that going from RPROC_RUNNING -> RPROC_DETACHED
> > is no longer supported to avoid dealing tricky resource table issues.
> 
> This seems reasonable to me. If necessary, this could be part of a separate series.
> 
> From test point of view, it is working pretty well on my side.

Thanks for taking a look a this.
Mathieu

> 
> Thanks,
> Arnaud
> 
> > 
> > Applies cleanly on rproc-next (e8b4e9a21af7).  I will rebase on 5.12-rc1 when it
> > comes out next week.
> > 
> > Thanks,
> > Mathieu
> > 
> > Arnaud POULIQUEN (1):
> >   remoteproc: stm32: Move memory parsing to rproc_ops
> > 
> > Mathieu Poirier (15):
> >   remoteproc: Remove useless check in rproc_del()
> >   remoteproc: Rename function rproc_actuate()
> >   remoteproc: Add new RPROC_ATTACHED state
> >   remoteproc: Properly represent the attached state
> >   remoteproc: Add new get_loaded_rsc_table() to rproc_ops
> >   remoteproc: stm32: Move resource table setup to rproc_ops
> >   remoteproc: Add new detach() remoteproc operation
> >   remoteproc: Introduce function __rproc_detach()
> >   remoteproc: Introduce function rproc_detach()
> >   remoteproc: Properly deal with the resource table when attached
> >   remoteproc: Properly deal with a kernel panic when attached
> >   remoteproc: Properly deal with a start request when attached
> >   remoteproc: Properly deal with a stop request when attached
> >   remoteproc: Properly deal with a detach request when attached
> >   remoteproc: Refactor rproc delete and cdev release path
> > 
> >  drivers/remoteproc/remoteproc_cdev.c     |  21 +-
> >  drivers/remoteproc/remoteproc_core.c     | 263 ++++++++++++++++++++---
> >  drivers/remoteproc/remoteproc_internal.h |  10 +
> >  drivers/remoteproc/remoteproc_sysfs.c    |  17 +-
> >  drivers/remoteproc/stm32_rproc.c         | 168 +++++++--------
> >  include/linux/remoteproc.h               |  21 +-
> >  6 files changed, 362 insertions(+), 138 deletions(-)
> >