linux-kernel - RE: [PATCH 6/8] remoteproc: Move resource table load logic to find

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Date:   Thu, 14 Dec 2017 20:12:19 +0000
From:   Loic PALLARDY <loic.pallardy@...com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     Ohad Ben-Cohen <ohad@...ery.com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 6/8] remoteproc: Move resource table load logic to find



> -----Original Message-----
> From: linux-remoteproc-owner@...r.kernel.org [mailto:linux-remoteproc-
> owner@...r.kernel.org] On Behalf Of Bjorn Andersson
> Sent: Thursday, December 14, 2017 8:48 PM
> To: Loic PALLARDY <loic.pallardy@...com>
> Cc: Ohad Ben-Cohen <ohad@...ery.com>; linux-
> remoteproc@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 6/8] remoteproc: Move resource table load logic to find
> 
> On Thu 14 Dec 04:00 PST 2017, Loic PALLARDY wrote:
> > > -----Original Message-----
> > > From: linux-remoteproc-owner@...r.kernel.org [mailto:linux-
> remoteproc-
> > > owner@...r.kernel.org] On Behalf Of Bjorn Andersson
> [..]
> > > +int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware
> *fw)
> > >  {
> > >  	struct elf32_hdr *ehdr;
> > >  	struct elf32_shdr *shdr;
> > >  	struct device *dev = &rproc->dev;
> > >  	struct resource_table *table = NULL;
> > >  	const u8 *elf_data = fw->data;
> > > +	size_t tablesz;
> > >
> > >  	ehdr = (struct elf32_hdr *)elf_data;
> > >
> > >  	shdr = find_table(dev, ehdr, fw->size);
> > >  	if (!shdr)
> > > -		return NULL;
> > > +		return -EINVAL;
> > Reading patch 7, I don't catch how firmware without resource table are
> > supported as if no table found, an error is returned here.
> > In rproc_fw_boot, you have:
> > 	ret = rproc_load_rsc_table(rproc, fw);
> > 	if (ret)
> > 		goto disable_iommu;
> > So boot process is interrupted...
> >
> 
> When a driver registers a remoteproc with load_rsc_table specified that
> implies that the resource table is not optional as such it's an error to
> not find one.
> 
> A driver that expects to load firmware without a resource table, such as
> st_slim_rproc with it's dummy resource table would set load_rsc_table to
> NULL.
Yes I saw that if no load_rsc_table, 0 is returned. Thanks for the explanations, I'll apply the series and review final code.
Regards,
Loic
> 
> 
> So the purpose is to maintain the current requirements, with the
> addition of removing the dummy implementations of find_rsc_table.
> 
> Regards,
> Bjorn
> --
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