> Subject: [PATCH V2] remoteproc: support self recovery after rproc crash Any comments? Thanks, Peng. > > From: Peng Fan <peng.fan@xxxxxxx> > > Current logic only support main processor to stop/start the remote processor > after rproc crash. However to SoC, such as i.MX8QM/QXP, the remote > processor could do self recovery after crash and trigger watchdog reboot. It > does not need main processor to load image, stop/start M4 core. > > This patch add a new flag to indicate whether the SoC has self recovery > capability. And introduce two functions: rproc_self_recovery, > rproc_assisted_recovery for the two cases. Assisted recovery is as before, let > main processor to help recovery, while self recovery is recover itself withou > help. To self recovery, we only do detach and attach. > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > --- > > V2: > Nothing change in V2. > Only move this patch out from > https://patchwork.kernel.org/project/linux-remoteproc/list/?series=604364 > > drivers/remoteproc/remoteproc_core.c | 66 ++++++++++++++++++++-------- > include/linux/remoteproc.h | 2 + > 2 files changed, 49 insertions(+), 19 deletions(-) > > diff --git a/drivers/remoteproc/remoteproc_core.c > b/drivers/remoteproc/remoteproc_core.c > index 69f51acf235e..4bd5544dab8f 100644 > --- a/drivers/remoteproc/remoteproc_core.c > +++ b/drivers/remoteproc/remoteproc_core.c > @@ -1887,6 +1887,49 @@ static int __rproc_detach(struct rproc *rproc) > return 0; > } > > +static int rproc_self_recovery(struct rproc *rproc) { > + int ret; > + > + mutex_unlock(&rproc->lock); > + ret = rproc_detach(rproc); > + mutex_lock(&rproc->lock); > + if (ret) > + return ret; > + > + if (atomic_inc_return(&rproc->power) > 1) > + return 0; > + return rproc_attach(rproc); > +} > + > +static int rproc_assisted_recovery(struct rproc *rproc) { > + const struct firmware *firmware_p; > + struct device *dev = &rproc->dev; > + int ret; > + > + ret = rproc_stop(rproc, true); > + if (ret) > + return ret; > + > + /* generate coredump */ > + rproc->ops->coredump(rproc); > + > + /* load firmware */ > + ret = request_firmware(&firmware_p, rproc->firmware, dev); > + if (ret < 0) { > + dev_err(dev, "request_firmware failed: %d\n", ret); > + return ret; > + } > + > + /* boot the remote processor up again */ > + ret = rproc_start(rproc, firmware_p); > + > + release_firmware(firmware_p); > + > + return ret; > +} > + > /** > * rproc_trigger_recovery() - recover a remoteproc > * @rproc: the remote processor > @@ -1901,7 +1944,6 @@ static int __rproc_detach(struct rproc *rproc) > */ > int rproc_trigger_recovery(struct rproc *rproc) { > - const struct firmware *firmware_p; > struct device *dev = &rproc->dev; > int ret; > > @@ -1915,24 +1957,10 @@ int rproc_trigger_recovery(struct rproc *rproc) > > dev_err(dev, "recovering %s\n", rproc->name); > > - ret = rproc_stop(rproc, true); > - if (ret) > - goto unlock_mutex; > - > - /* generate coredump */ > - rproc->ops->coredump(rproc); > - > - /* load firmware */ > - ret = request_firmware(&firmware_p, rproc->firmware, dev); > - if (ret < 0) { > - dev_err(dev, "request_firmware failed: %d\n", ret); > - goto unlock_mutex; > - } > - > - /* boot the remote processor up again */ > - ret = rproc_start(rproc, firmware_p); > - > - release_firmware(firmware_p); > + if (rproc->self_recovery) > + ret = rproc_self_recovery(rproc); > + else > + ret = rproc_assisted_recovery(rproc); > > unlock_mutex: > mutex_unlock(&rproc->lock); > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index > e0600e1e5c17..b32ef46f8aa4 100644 > --- a/include/linux/remoteproc.h > +++ b/include/linux/remoteproc.h > @@ -529,6 +529,7 @@ struct rproc_dump_segment { > * @elf_machine: firmware ELF machine > * @cdev: character device of the rproc > * @cdev_put_on_release: flag to indicate if remoteproc should be > shutdown on @char_dev release > + * @self_recovery: flag to indicate if remoteproc support self recovery > */ > struct rproc { > struct list_head node; > @@ -568,6 +569,7 @@ struct rproc { > u16 elf_machine; > struct cdev cdev; > bool cdev_put_on_release; > + bool self_recovery; > }; > > /** > -- > 2.25.1
