linux-kernel - RE: [PATCH v4 06/17] remoteproc: introduce rproc_add

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Message-ID: <415434350e194ee78811629fa41aa7d2@SFHDAG7NODE2.st.com>
Date:   Tue, 23 Oct 2018 19:48:22 +0000
From:   Loic PALLARDY <loic.pallardy@...com>
To:     Suman Anna <s-anna@...com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>
CC:     "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Arnaud POULIQUEN" <arnaud.pouliquen@...com>,
        "benjamin.gaignard@...aro.org" <benjamin.gaignard@...aro.org>
Subject: RE: [PATCH v4 06/17] remoteproc: introduce rproc_add_carveout
 function



> -----Original Message-----
> From: Suman Anna <s-anna@...com>
> Sent: mardi 23 octobre 2018 19:05
> To: Loic PALLARDY <loic.pallardy@...com>; bjorn.andersson@...aro.org;
> ohad@...ery.com
> Cc: linux-remoteproc@...r.kernel.org; linux-kernel@...r.kernel.org;
> Arnaud POULIQUEN <arnaud.pouliquen@...com>;
> benjamin.gaignard@...aro.org
> Subject: Re: [PATCH v4 06/17] remoteproc: introduce rproc_add_carveout
> function
> 
> Hi Bjorn, Loic,
> 
> On 7/27/18 8:14 AM, Loic Pallardy wrote:
> > This patch introduces a new API to allow platform driver to register
> > platform specific carveout regions.
> >
> > Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> > Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Hmm, I do not prefer that this function be exported. It adds no value,
> and this adds an asymmetric API for remoteproc drivers to add a mem
> entry to the internal remoteproc lists, while relying on the remoteproc
> core to remove them. The carveout list maintenance is a remoteproc
> internal scheme, and so should be maintained that way. Further more, on
> the current series, all the existing calls are immediately after a
> rproc_of_resm_mem_entry_init() or a rproc_mem_entry_init() function,
> which means this could very well be folded into those individual functions.
> 
I think it has been introduced in first series. Look that rproc_add_carveout() call could be integrated in helper functions now.
I can propose a patch to correct this.

Regards,
Loic
> regards
> Suman
> 
> > ---
> >  drivers/remoteproc/remoteproc_core.c | 16 +++++++++++++++-
> >  include/linux/remoteproc.h           |  2 ++
> >  2 files changed, 17 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c
> b/drivers/remoteproc/remoteproc_core.c
> > index b76760e..fe6c4e4 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -747,7 +747,7 @@ static int rproc_handle_carveout(struct rproc
> *rproc,
> >  	if (!carveout)
> >  		goto free_carv;
> >
> > -	list_add_tail(&carveout->node, &rproc->carveouts);
> > +	rproc_add_carveout(rproc, carveout);
> >
> >  	return 0;
> >
> > @@ -761,6 +761,20 @@ static int rproc_handle_carveout(struct rproc
> *rproc,
> >  }
> >
> >  /**
> > + * rproc_add_carveout() - register an allocated carveout region
> > + * @rproc: rproc handle
> > + * @mem: memory entry to register
> > + *
> > + * This function registers specified memory entry in @rproc carveouts list.
> > + * Specified carveout should have been allocated before registering.
> > + */
> > +void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry
> *mem)
> > +{
> > +	list_add_tail(&mem->node, &rproc->carveouts);
> > +}
> > +EXPORT_SYMBOL(rproc_add_carveout);
> > +
> > +/**
> >   * rproc_mem_entry_init() - allocate and initialize rproc_mem_entry struct
> >   * @dev: pointer on device struct
> >   * @va: virtual address
> > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> > index 4bc961f..55f30fc 100644
> > --- a/include/linux/remoteproc.h
> > +++ b/include/linux/remoteproc.h
> > @@ -558,6 +558,8 @@ struct rproc *rproc_alloc(struct device *dev, const
> char *name,
> >  int rproc_del(struct rproc *rproc);
> >  void rproc_free(struct rproc *rproc);
> >
> > +void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry
> *mem);
> > +
> >  struct rproc_mem_entry *
> >  rproc_mem_entry_init(struct device *dev,
> >  		     void *va, dma_addr_t dma, int len, u32 da,
> >