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Date:   Thu, 30 Apr 2020 13:57:49 -0600
From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     Arnaud POULIQUEN <arnaud.pouliquen@st.com>
Cc:     bjorn.andersson@linaro.org, ohad@wizery.com, loic.pallardy@st.com,
        s-anna@ti.com, linux-remoteproc@vger.kernel.org, corbet@lwn.net,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 08/14] remoteproc: Call core functions based on
 synchronisation flag
Message-ID: <20200430195749.GC17031@xps15>
References: <20200424200135.28825-1-mathieu.poirier@linaro.org>
 <20200424200135.28825-9-mathieu.poirier@linaro.org>
 <a17d871a-3b3f-a462-9b2c-f9183f80a533@st.com>
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On Tue, Apr 28, 2020 at 07:27:27PM +0200, Arnaud POULIQUEN wrote:
> 
> 
> On 4/24/20 10:01 PM, Mathieu Poirier wrote:
> > Call the right core function based on whether we should synchronise
> > with a remote processor or boot it from scratch.
> > 
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> > ---
> >  drivers/remoteproc/remoteproc_internal.h | 50 ++++++++++++++++++++++++
> >  1 file changed, 50 insertions(+)
> > 
> > diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> > index dda7044c4b3e..3985c084b184 100644
> > --- a/drivers/remoteproc/remoteproc_internal.h
> > +++ b/drivers/remoteproc/remoteproc_internal.h
> > @@ -72,6 +72,12 @@ static inline bool rproc_needs_syncing(struct rproc *rproc)
> >  static inline
> >  int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->sanity_check)
> > +			return rproc->sync_ops->sanity_check(rproc, fw);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->sanity_check)
> >  		return rproc->ops->sanity_check(rproc, fw);
> 
> Regarding this patch I'm trying to determine whether it makes sense to have ops or
> sync_ops set to null. Your[v3 01/14]  patch commit explains that ops can be null in case of
> synchronisation.
> But it seems deprecated with the sync_ops introduction...

Your comment made me go over the logic again...  If rproc_needs_syncing() is
true then we necessarily have a sync_ops.  If rproc_needs_syncing() is false,
there too we automatically have an ops.  As such and as you point out, checking
for rproc->sync_ops and rproc-ops is probably useless.

> 
> And if sync_ops is null, is it still necessary to define a remoteproc device?

Not sure I understand your point here but with the reasonning from above it
is probably moot anyway. 

> 
> Regards
> Arnad
> 
> >  
> > @@ -81,6 +87,12 @@ int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
> >  static inline
> >  u64 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->get_boot_addr)
> > +			return rproc->sync_ops->get_boot_addr(rproc, fw);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->get_boot_addr)
> >  		return rproc->ops->get_boot_addr(rproc, fw);
> >  
> > @@ -90,6 +102,12 @@ u64 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
> >  static inline
> >  int rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->load)
> > +			return rproc->sync_ops->load(rproc, fw);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->load)
> >  		return rproc->ops->load(rproc, fw);
> >  
> > @@ -98,6 +116,12 @@ int rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
> >  
> >  static inline int rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->parse_fw)
> > +			return rproc->sync_ops->parse_fw(rproc, fw);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->parse_fw)
> >  		return rproc->ops->parse_fw(rproc, fw);
> >  
> > @@ -108,6 +132,13 @@ static inline
> >  int rproc_handle_rsc(struct rproc *rproc, u32 rsc_type, void *rsc, int offset,
> >  		     int avail)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->handle_rsc)
> > +			return rproc->sync_ops->handle_rsc(rproc, rsc_type,
> > +							   rsc, offset, avail);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->handle_rsc)
> >  		return rproc->ops->handle_rsc(rproc, rsc_type, rsc, offset,
> >  					      avail);
> > @@ -119,6 +150,13 @@ static inline
> >  struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc,
> >  						   const struct firmware *fw)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->find_loaded_rsc_table)
> > +			return rproc->sync_ops->find_loaded_rsc_table(rproc,
> > +								      fw);
> > +		return NULL;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->find_loaded_rsc_table)
> >  		return rproc->ops->find_loaded_rsc_table(rproc, fw);
> >  
> > @@ -127,6 +165,12 @@ struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc,
> >  
> >  static inline int rproc_start_device(struct rproc *rproc)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->start)
> > +			return rproc->sync_ops->start(rproc);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->start)
> >  		return rproc->ops->start(rproc);
> >  
> > @@ -135,6 +179,12 @@ static inline int rproc_start_device(struct rproc *rproc)
> >  
> >  static inline int rproc_stop_device(struct rproc *rproc)
> >  {
> > +	if (rproc_needs_syncing(rproc)) {
> > +		if (rproc->sync_ops && rproc->sync_ops->stop)
> > +			return rproc->sync_ops->stop(rproc);
> > +		return 0;
> > +	}
> > +
> >  	if (rproc->ops && rproc->ops->stop)
> >  		return rproc->ops->stop(rproc);
> >  
> >