| Message ID | 1496500976-18362-3-git-send-email-leo.yan@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | coresight: support panic dump functionality | expand |
On 03/06/17 15:42, Leo Yan wrote: > If the sink device has panic callback function, add the panic callback > node for coresight panic dump list when the sink device is enabled; > also cleanup the node when the sink device is disabled. > > Signed-off-by: Leo Yan <leo.yan@linaro.org> > --- > drivers/hwtracing/coresight/coresight.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c > index 0c37356..5928886 100644 > --- a/drivers/hwtracing/coresight/coresight.c > +++ b/drivers/hwtracing/coresight/coresight.c > @@ -138,6 +138,13 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) > if (ret) > return ret; > } > + > + /* Add kernel panic callback */ > + if (sink_ops(csdev)->panic_cb) { > + ret = coresight_add_panic_cb(csdev); > + if (ret) > + return ret; > + } > csdev->enable = true; > } > > @@ -149,6 +156,10 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) > static void coresight_disable_sink(struct coresight_device *csdev) > { > if (atomic_dec_return(csdev->refcnt) == 0) { > + /* Remove kernel panic callback */ > + if (sink_ops(csdev)->panic_cb) > + coresight_del_panic_cb(csdev); > + > if (sink_ops(csdev)->disable) { > sink_ops(csdev)->disable(csdev); > csdev->enable = false; > Just a thought, instead of adding/deleting every time the sink is enabled, could we add/del the device once for-ever and let the panic_cb decide to dump it based on whether the device was active or not ? Suzuki
On Mon, Jun 05, 2017 at 10:24:41AM +0100, Suzuki K Poulose wrote: > On 03/06/17 15:42, Leo Yan wrote: > >If the sink device has panic callback function, add the panic callback > >node for coresight panic dump list when the sink device is enabled; > >also cleanup the node when the sink device is disabled. > > > >Signed-off-by: Leo Yan <leo.yan@linaro.org> > >--- > > drivers/hwtracing/coresight/coresight.c | 11 +++++++++++ > > 1 file changed, 11 insertions(+) > > > >diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c > >index 0c37356..5928886 100644 > >--- a/drivers/hwtracing/coresight/coresight.c > >+++ b/drivers/hwtracing/coresight/coresight.c > >@@ -138,6 +138,13 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) > > if (ret) > > return ret; > > } > >+ > >+ /* Add kernel panic callback */ > >+ if (sink_ops(csdev)->panic_cb) { > >+ ret = coresight_add_panic_cb(csdev); > >+ if (ret) > >+ return ret; > >+ } > > csdev->enable = true; > > } > > > >@@ -149,6 +156,10 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) > > static void coresight_disable_sink(struct coresight_device *csdev) > > { > > if (atomic_dec_return(csdev->refcnt) == 0) { > >+ /* Remove kernel panic callback */ > >+ if (sink_ops(csdev)->panic_cb) > >+ coresight_del_panic_cb(csdev); > >+ > > if (sink_ops(csdev)->disable) { > > sink_ops(csdev)->disable(csdev); > > csdev->enable = false; > > > > Just a thought, instead of adding/deleting every time the sink is enabled, > could we add/del the device once for-ever and let the panic_cb decide to dump > it based on whether the device was active or not ? Yeah, we can check 'if (drvdata->mode == CS_MODE_DISABLED)' and directly bail out if the module is disabled for panic dumping. Will fix with this way. Thanks, Leo Yan
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 0c37356..5928886 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -138,6 +138,13 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) if (ret) return ret; } + + /* Add kernel panic callback */ + if (sink_ops(csdev)->panic_cb) { + ret = coresight_add_panic_cb(csdev); + if (ret) + return ret; + } csdev->enable = true; } @@ -149,6 +156,10 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) static void coresight_disable_sink(struct coresight_device *csdev) { if (atomic_dec_return(csdev->refcnt) == 0) { + /* Remove kernel panic callback */ + if (sink_ops(csdev)->panic_cb) + coresight_del_panic_cb(csdev); + if (sink_ops(csdev)->disable) { sink_ops(csdev)->disable(csdev); csdev->enable = false;
If the sink device has panic callback function, add the panic callback node for coresight panic dump list when the sink device is enabled; also cleanup the node when the sink device is disabled. Signed-off-by: Leo Yan <leo.yan@linaro.org> --- drivers/hwtracing/coresight/coresight.c | 11 +++++++++++ 1 file changed, 11 insertions(+) -- 2.7.4