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Date:   Tue, 5 May 2020 16:10:47 -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: <20200505221047.GC18333@xps15>
References: <20200424200135.28825-1-mathieu.poirier@linaro.org>
 <20200424200135.28825-9-mathieu.poirier@linaro.org>
 <a17d871a-3b3f-a462-9b2c-f9183f80a533@st.com>
 <20200430195749.GC17031@xps15>
 <6f85f227-e244-8136-b0f4-0b6ab167d852@st.com>
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On Mon, May 04, 2020 at 01:14:59PM +0200, Arnaud POULIQUEN wrote:
> hi Mathieu,
> 
> On 4/30/20 9:57 PM, Mathieu Poirier wrote:
> > 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.
> An Additional test in rproc_set_state_machine should be sufficient, something like that: 
>  /* rproc->ops struct is mandatory if at least one sync flag is false */
>  if (!rproc->ops && !(sync_flags.on_init &&
> 	    sync_flags.after_stop && sync_flags.after_crash))
> 		return -EINVAL;

Right, something like that. 

> 
> > 
> >>
> >> 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. 
> Just to mention that a platform device with ops and ops_sync null seems like nonsense 

We agree.

> 
> Regards,
> Arnaud
> > 
> >>
> >> 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);
> >>>  
> >>>