lkml.org 
[lkml]   [2020]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [RFC 1/2] remoteproc: sysfs: authorize rproc shutdown when rproc is crashed
Date
Hi Mathieu,

> -----Original Message-----
> From: Mathieu Poirier <mathieu.poirier@linaro.org>
> Sent: mercredi 11 mars 2020 22:45
> To: Loic PALLARDY <loic.pallardy@st.com>
> Cc: bjorn.andersson@linaro.org; ohad@wizery.com; linux-
> remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org; Arnaud
> POULIQUEN <arnaud.pouliquen@st.com>; benjamin.gaignard@linaro.org;
> Fabien DESSENNE <fabien.dessenne@st.com>; s-anna@ti.com
> Subject: Re: [RFC 1/2] remoteproc: sysfs: authorize rproc shutdown when
> rproc is crashed
>
> Hi Loic,
>
> On Wed, Mar 11, 2020 at 11:54:31AM +0100, Loic Pallardy wrote:
> > When remoteproc recovery is disabled and rproc crashed, user space
> > client has no way to reboot co-processor except by a complete platform
> > reboot.
> > Indeed rproc_shutdown() is called by sysfs state_store() only is rproc
> > state is RPROC_RUNNING.
> >
> > This patch offers the possibility to shutdown the co-processor if
> > it is in RPROC_CRASHED state and so to restart properly co-processor
> > from sysfs interface.
>
> And it is not possible to use the debugfs interface [1] to restart the MCU?
>
> [1]. https://elixir.bootlin.com/linux/v5.6-
> rc2/source/drivers/remoteproc/remoteproc_debugfs.c#L147

Debugfs interface is optional and on final product it is often disabled.
The used control interfaces are in kernel API and sysfs one.

Regards,
Loic
>
>
> >
> > Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
> > ---
> > drivers/remoteproc/remoteproc_core.c | 2 +-
> > drivers/remoteproc/remoteproc_sysfs.c | 2 +-
> > 2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c
> b/drivers/remoteproc/remoteproc_core.c
> > index 097f33e4f1f3..7ac87a75cd1b 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -1812,7 +1812,7 @@ void rproc_shutdown(struct rproc *rproc)
> > if (!atomic_dec_and_test(&rproc->power))
> > goto out;
> >
> > - ret = rproc_stop(rproc, false);
> > + ret = rproc_stop(rproc, rproc->state == RPROC_CRASHED);
> > if (ret) {
> > atomic_inc(&rproc->power);
> > goto out;
> > diff --git a/drivers/remoteproc/remoteproc_sysfs.c
> b/drivers/remoteproc/remoteproc_sysfs.c
> > index 7f8536b73295..1029458a4678 100644
> > --- a/drivers/remoteproc/remoteproc_sysfs.c
> > +++ b/drivers/remoteproc/remoteproc_sysfs.c
> > @@ -101,7 +101,7 @@ static ssize_t state_store(struct device *dev,
> > if (ret)
> > dev_err(&rproc->dev, "Boot failed: %d\n", ret);
> > } else if (sysfs_streq(buf, "stop")) {
> > - if (rproc->state != RPROC_RUNNING)
> > + if (rproc->state != RPROC_RUNNING && rproc->state !=
> RPROC_CRASHED)
> > return -EINVAL;
> >
> > rproc_shutdown(rproc);
> > --
> > 2.7.4
> >

\
 
 \ /
  Last update: 2020-03-12 09:01    [W:0.056 / U:5.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site