linux-kernel - RE: [PATCH v2 01/16] remoteproc: add rproc_va_to

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Date:   Fri, 12 Jan 2018 07:43:09 +0000
From:   Loic PALLARDY <loic.pallardy@...com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     "ohad@...ery.com" <ohad@...ery.com>,
        "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 v2 01/16] remoteproc: add rproc_va_to_pa function


Hi Bjorn,

Thanks for the review of this series.

> -----Original Message-----
> From: Bjorn Andersson [mailto:bjorn.andersson@...aro.org]
> Sent: Thursday, December 14, 2017 1:31 AM
> To: Loic PALLARDY <loic.pallardy@...com>
> Cc: ohad@...ery.com; linux-remoteproc@...r.kernel.org; linux-
> kernel@...r.kernel.org; Arnaud POULIQUEN <arnaud.pouliquen@...com>;
> benjamin.gaignard@...aro.org
> Subject: Re: [PATCH v2 01/16] remoteproc: add rproc_va_to_pa function
> 
> On Thu 30 Nov 08:46 PST 2017, Loic Pallardy wrote:
> 
> > This new function translates CPU virtual address in
> > CPU physical one according to virtual address location.
> >
> > Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> > ---
> >  drivers/remoteproc/remoteproc_core.c | 13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c
> b/drivers/remoteproc/remoteproc_core.c
> > index eab14b4..faa18a7 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -139,6 +139,17 @@ static void rproc_disable_iommu(struct rproc
> *rproc)
> >  	iommu_domain_free(domain);
> >  }
> >
> > +static phys_addr_t rproc_va_to_pa(void *cpu_addr)
> > +{
> > +	if (is_vmalloc_addr(cpu_addr)) {
> 
> Please add a comment describing when is_vmalloc_addr() would be true.
Yes sure.
Regards,
Loic
> 
> > +		return page_to_phys(vmalloc_to_page(cpu_addr)) +
> > +				    offset_in_page(cpu_addr);
> > +	}
> > +
> > +	WARN_ON(!virt_addr_valid(cpu_addr));
> > +	return virt_to_phys(cpu_addr);
> > +}
> > +
> >  /**
> >   * rproc_da_to_va() - lookup the kernel virtual address for a remoteproc
> address
> >   * @rproc: handle of a remote processor
> > @@ -700,7 +711,7 @@ static int rproc_handle_carveout(struct rproc
> *rproc,
> >  	 * In this case, the device address and the physical address
> >  	 * are the same.
> >  	 */
> > -	rsc->pa = dma;
> > +	rsc->pa = (u32)rproc_va_to_pa(va);
> 
> This is more correct than using "dma", so this is good.
> 
> Regards,
> Bjorn