linux-kernel - Re: [PATCH 2/7] staging/android: display sync

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Date:	Mon, 8 Aug 2016 16:59:18 -0300
From:	Gustavo Padovan <gustavo.padovan@...labora.com>
To:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:	Gustavo Padovan <gustavo@...ovan.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	dri-devel@...ts.freedesktop.org,
	Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH 2/7] staging/android: display sync_pt name on debugfs

2016-08-08 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>:

> Op 20-06-16 om 17:53 schreef Gustavo Padovan:
> > From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> >
> > When creating a sync_pt the name received wasn't used anywhere.
> > Now we add it to the sync info debug output to make it easier to indetify
> > the userspace name of that sync pt.
> >
> > Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> > ---
> >  drivers/staging/android/sw_sync.c    | 16 ++++------------
> >  drivers/staging/android/sync_debug.c |  5 +++--
> >  drivers/staging/android/sync_debug.h |  9 +++++++++
> >  3 files changed, 16 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/staging/android/sw_sync.c b/drivers/staging/android/sw_sync.c
> > index b4ae092..ea27512 100644
> > --- a/drivers/staging/android/sw_sync.c
> > +++ b/drivers/staging/android/sw_sync.c
> > @@ -37,15 +37,6 @@ struct sw_sync_create_fence_data {
> >  		struct sw_sync_create_fence_data)
> >  #define SW_SYNC_IOC_INC			_IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
> >  
> > -static const struct fence_ops timeline_fence_ops;
> > -
> > -static inline struct sync_pt *fence_to_sync_pt(struct fence *fence)
> > -{
> > -	if (fence->ops != &timeline_fence_ops)
> > -		return NULL;
> > -	return container_of(fence, struct sync_pt, base);
> > -}
> > -
> >  struct sync_timeline *sync_timeline_create(const char *name)
> >  {
> >  	struct sync_timeline *obj;
> > @@ -108,7 +99,7 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc)
> >  }
> >  
> >  static struct sync_pt *sync_pt_create(struct sync_timeline *obj, int size,
> > -			     unsigned int value)
> > +			     unsigned int value, char *name)
> >  {
> >  	unsigned long flags;
> >  	struct sync_pt *pt;
> > @@ -120,6 +111,7 @@ static struct sync_pt *sync_pt_create(struct sync_timeline *obj, int size,
> >  	if (!pt)
> >  		return NULL;
> >  
> > +	strlcpy(pt->name, name, sizeof(pt->name));
> >  	spin_lock_irqsave(&obj->child_list_lock, flags);
> >  	sync_timeline_get(obj);
> >  	fence_init(&pt->base, &timeline_fence_ops, &obj->child_list_lock,
> > @@ -191,7 +183,7 @@ static void timeline_fence_timeline_value_str(struct fence *fence,
> >  	snprintf(str, size, "%d", parent->value);
> >  }
> >  
> > -static const struct fence_ops timeline_fence_ops = {
> > +const struct fence_ops timeline_fence_ops = {
> >  	.get_driver_name = timeline_fence_get_driver_name,
> >  	.get_timeline_name = timeline_fence_get_timeline_name,
> >  	.enable_signaling = timeline_fence_enable_signaling,
> > @@ -252,7 +244,7 @@ static long sw_sync_ioctl_create_fence(struct sync_timeline *obj,
> >  		goto err;
> >  	}
> >  
> > -	pt = sync_pt_create(obj, sizeof(*pt), data.value);
> > +	pt = sync_pt_create(obj, sizeof(*pt), data.value, data.name);
> >  	if (!pt) {
> >  		err = -ENOMEM;
> >  		goto err;
> > diff --git a/drivers/staging/android/sync_debug.c b/drivers/staging/android/sync_debug.c
> > index 4c5a855..b732ea3 100644
> > --- a/drivers/staging/android/sync_debug.c
> > +++ b/drivers/staging/android/sync_debug.c
> > @@ -75,13 +75,14 @@ static void sync_print_fence(struct seq_file *s, struct fence *fence, bool show)
> >  {
> >  	int status = 1;
> >  	struct sync_timeline *parent = fence_parent(fence);
> > +	struct sync_pt *pt = fence_to_sync_pt(fence);
> >  
> >  	if (fence_is_signaled_locked(fence))
> >  		status = fence->status;
> >  
> > -	seq_printf(s, "  %s%sfence %s",
> > +	seq_printf(s, "  %s%sfence %s %s",
> >  		   show ? parent->name : "",
> > -		   show ? "_" : "",
> > +		   show ? "_" : "", pt->name,
> >  		   sync_status_str(status));
> >  
> NAK,
> A fence in sync_print_fence can be of any type. If you want to print the name, use the fence_value_str callback.

Indeed. But fence_value_str doesn't return the sync_pt name, but the
seqno of that fence. I'll keep this change out for the de-staging and
then try to come with something that works better.

	Gustavo