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Date:   Tue, 10 Mar 2020 09:20:31 -0600
From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     Bjorn Andersson <bjorn.andersson@linaro.org>
Cc:     Cl?ment Leger <cleger@kalrayinc.com>,
        Ohad Ben-Cohen <ohad@wizery.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        linux-remoteproc <linux-remoteproc@vger.kernel.org>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Andy Gross <agross@kernel.org>,
        Patrice Chotard <patrice.chotard@st.com>,
        linux-doc <linux-doc@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        Arnaud Pouliquen <arnaud.pouliquen@st.com>,
        Loic PALLARDY <loic.pallardy@st.com>, s-anna <s-anna@ti.com>
Subject: Re: [PATCH v5 5/8] remoteproc: Rename rproc_elf_sanity_check for
 elf32
Message-ID: <20200310152031.GA25781@xps15>
References: <20200210162209.23149-1-cleger@kalray.eu>
 <20200302093902.27849-1-cleger@kalray.eu>
 <20200302093902.27849-6-cleger@kalray.eu>
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On Mon, Mar 09, 2020 at 05:00:05PM -0700, Bjorn Andersson wrote:
> On Tue 03 Mar 00:02 PST 2020, Cl?ment Leger wrote:
> 
> > Hi Bjorn, 
> > 
> > ----- On 3 Mar, 2020, at 00:13, Bjorn Andersson bjorn.andersson@linaro.org wrote:
> > 
> > > On Mon 02 Mar 01:38 PST 2020, Clement Leger wrote:
> > > 
> > >> Since this function will be modified to support both elf32 and elf64,
> > >> rename the existing one to elf32 (which is the only supported format
> > >> at the moment). This will allow not to introduce possible side effect
> > >> when adding elf64 support (ie: all backends will still support only
> > >> elf32 if not requested explicitely using rproc_elf_sanity_check).
> > >> 
> > > 
> > > Is there a reason for preventing ELF64 binaries be loaded?
> > 
> > I decided to go this way to let driver maintainer decide if they want
> > to support elf64 to avoid problems with 64bits addresses/sizes which do
> > not fit in their native type (size_t for instance). This is probably
> > not going to happen and there are additionnal checks before calling
> > rproc_da_to_va. And addresses should be filtered by rproc_da_to_va.
> > So, actually it seems there is no reason to forbid supporting elf32/64
> > for all drivers.
> > 
> 
> I was hoping to hear some additional feedback on this from others.

I didn't follow up on this one because I agreed with your assesment and didn't
think it was needed.

Simply put I would rather see rproc_elf_sanity_check() gain support for elf64
and let the platform code decide what to do with format they don't support
rather than spinning a new function.

> 
> I've merge the patch as is, but think it would be nice to clean this up
> and just have the driver ignore if fed a 32 or 64-elf.

It would be really nice to see this cleaned up in time for the coming merge
window...

Thanks
Mathieu

> 
> Regards,
> Bjorn
> 
> > Regards,
> > 
> > Cl?ment
> > 
> > > 
> > > Regards,
> > > Bjorn
> > > 
> > >> Signed-off-by: Clement Leger <cleger@kalray.eu>
> > >> ---
> > >>  drivers/remoteproc/remoteproc_core.c       | 2 +-
> > >>  drivers/remoteproc/remoteproc_elf_loader.c | 6 +++---
> > >>  drivers/remoteproc/remoteproc_internal.h   | 2 +-
> > >>  drivers/remoteproc/st_remoteproc.c         | 2 +-
> > >>  drivers/remoteproc/st_slim_rproc.c         | 2 +-
> > >>  drivers/remoteproc/stm32_rproc.c           | 2 +-
> > >>  6 files changed, 8 insertions(+), 8 deletions(-)
> > >> 
> > >> diff --git a/drivers/remoteproc/remoteproc_core.c
> > >> b/drivers/remoteproc/remoteproc_core.c
> > >> index 4bfaf4a3c4a3..99f0b796fbc7 100644
> > >> --- a/drivers/remoteproc/remoteproc_core.c
> > >> +++ b/drivers/remoteproc/remoteproc_core.c
> > >> @@ -2055,7 +2055,7 @@ struct rproc *rproc_alloc(struct device *dev, const char
> > >> *name,
> > >>  		rproc->ops->load = rproc_elf_load_segments;
> > >>  		rproc->ops->parse_fw = rproc_elf_load_rsc_table;
> > >>  		rproc->ops->find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table;
> > >> -		rproc->ops->sanity_check = rproc_elf_sanity_check;
> > >> +		rproc->ops->sanity_check = rproc_elf32_sanity_check;
> > >>  		rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;
> > >>  	}
> > >>  
> > >> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c
> > >> b/drivers/remoteproc/remoteproc_elf_loader.c
> > >> index c2a9783cfb9a..5a67745f2638 100644
> > >> --- a/drivers/remoteproc/remoteproc_elf_loader.c
> > >> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
> > >> @@ -25,13 +25,13 @@
> > >>  #include "remoteproc_internal.h"
> > >>  
> > >>  /**
> > >> - * rproc_elf_sanity_check() - Sanity Check ELF firmware image
> > >> + * rproc_elf_sanity_check() - Sanity Check ELF32 firmware image
> > >>   * @rproc: the remote processor handle
> > >>   * @fw: the ELF firmware image
> > >>   *
> > >>   * Make sure this fw image is sane.
> > >>   */
> > >> -int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
> > >> +int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw)
> > >>  {
> > >>  	const char *name = rproc->firmware;
> > >>  	struct device *dev = &rproc->dev;
> > >> @@ -89,7 +89,7 @@ int rproc_elf_sanity_check(struct rproc *rproc, const struct
> > >> firmware *fw)
> > >>  
> > >>  	return 0;
> > >>  }
> > >> -EXPORT_SYMBOL(rproc_elf_sanity_check);
> > >> +EXPORT_SYMBOL(rproc_elf32_sanity_check);
> > >>  
> > >>  /**
> > >>   * rproc_elf_get_boot_addr() - Get rproc's boot address.
> > >> diff --git a/drivers/remoteproc/remoteproc_internal.h
> > >> b/drivers/remoteproc/remoteproc_internal.h
> > >> index 0deae5f237b8..28639c588d58 100644
> > >> --- a/drivers/remoteproc/remoteproc_internal.h
> > >> +++ b/drivers/remoteproc/remoteproc_internal.h
> > >> @@ -54,7 +54,7 @@ void *rproc_da_to_va(struct rproc *rproc, u64 da, size_t len);
> > >>  phys_addr_t rproc_va_to_pa(void *cpu_addr);
> > >>  int rproc_trigger_recovery(struct rproc *rproc);
> > >>  
> > >> -int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw);
> > >> +int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw);
> > >>  u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
> > >>  int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw);
> > >>  int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw);
> > >> diff --git a/drivers/remoteproc/st_remoteproc.c
> > >> b/drivers/remoteproc/st_remoteproc.c
> > >> index a3268d95a50e..a6cbfa452764 100644
> > >> --- a/drivers/remoteproc/st_remoteproc.c
> > >> +++ b/drivers/remoteproc/st_remoteproc.c
> > >> @@ -233,7 +233,7 @@ static const struct rproc_ops st_rproc_ops = {
> > >>  	.parse_fw		= st_rproc_parse_fw,
> > >>  	.load			= rproc_elf_load_segments,
> > >>  	.find_loaded_rsc_table	= rproc_elf_find_loaded_rsc_table,
> > >> -	.sanity_check		= rproc_elf_sanity_check,
> > >> +	.sanity_check		= rproc_elf32_sanity_check,
> > >>  	.get_boot_addr		= rproc_elf_get_boot_addr,
> > >>  };
> > >>  
> > >> diff --git a/drivers/remoteproc/st_slim_rproc.c
> > >> b/drivers/remoteproc/st_slim_rproc.c
> > >> index 09bcb4d8b9e0..3cca8b65a8db 100644
> > >> --- a/drivers/remoteproc/st_slim_rproc.c
> > >> +++ b/drivers/remoteproc/st_slim_rproc.c
> > >> @@ -203,7 +203,7 @@ static const struct rproc_ops slim_rproc_ops = {
> > >>  	.da_to_va       = slim_rproc_da_to_va,
> > >>  	.get_boot_addr	= rproc_elf_get_boot_addr,
> > >>  	.load		= rproc_elf_load_segments,
> > >> -	.sanity_check	= rproc_elf_sanity_check,
> > >> +	.sanity_check	= rproc_elf32_sanity_check,
> > >>  };
> > >>  
> > >>  /**
> > >> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> > >> index a18f88044111..9a8b5f5e2572 100644
> > >> --- a/drivers/remoteproc/stm32_rproc.c
> > >> +++ b/drivers/remoteproc/stm32_rproc.c
> > >> @@ -505,7 +505,7 @@ static struct rproc_ops st_rproc_ops = {
> > >>  	.load		= rproc_elf_load_segments,
> > >>  	.parse_fw	= stm32_rproc_parse_fw,
> > >>  	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
> > >> -	.sanity_check	= rproc_elf_sanity_check,
> > >> +	.sanity_check	= rproc_elf32_sanity_check,
> > >>  	.get_boot_addr	= rproc_elf_get_boot_addr,
> > >>  };
> > >>  
> > >> --
> > >> 2.15.0.276.g89ea799