linux-kernel - Re: [PATCH 1/2] remoteproc: add rproc_coredump_set_elf

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Message-ID: <1280711269.16158926.1587152627279.JavaMail.zimbra@kalray.eu>
Date:   Fri, 17 Apr 2020 21:43:47 +0200 (CEST)
From:   Clément Leger <cleger@...rayinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-remoteproc <linux-remoteproc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-stm32 <linux-stm32@...md-mailman.stormreply.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] remoteproc: add rproc_coredump_set_elf_info

----- On 17 Apr, 2020, at 21:38, Mathieu Poirier mathieu.poirier@...aro.org wrote:

> On Fri, Apr 10, 2020 at 12:24:32PM +0200, Clement Leger wrote:
>> This function allows drivers to correctly setup the coredump output
>> elf information.
>> 
>> Signed-off-by: Clement Leger <cleger@...ray.eu>
>> ---
>>  drivers/remoteproc/remoteproc_core.c       | 32 ++++++++++++++++++++--
>>  drivers/remoteproc/remoteproc_elf_loader.c |  3 --
>>  include/linux/remoteproc.h                 |  2 ++
>>  3 files changed, 32 insertions(+), 5 deletions(-)
>> 
>> diff --git a/drivers/remoteproc/remoteproc_core.c
>> b/drivers/remoteproc/remoteproc_core.c
>> index a9ac1d01e09b..382443bab583 100644
>> --- a/drivers/remoteproc/remoteproc_core.c
>> +++ b/drivers/remoteproc/remoteproc_core.c
>> @@ -1562,6 +1562,28 @@ int rproc_coredump_add_custom_segment(struct rproc
>> *rproc,
>>  }
>>  EXPORT_SYMBOL(rproc_coredump_add_custom_segment);
>>  
>> +/**
>> + * rproc_coredump_set_elf_info() - set coredump elf information
>> + * @rproc:	handle of a remote processor
>> + * @class:	elf class for coredump elf file
>> + * @size:	elf machine for coredump elf file

I just noticed that there is a typo, this should be "machine" and not "size".
Let me know if you'll fix it when applying.

Thanks,

Clément

>> + *
>> + * Set elf information which will be used for coredump elf file.
>> + *
>> + * Return: 0 on success, negative errno on error.
>> + */
>> +int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine)
>> +{
>> +	if (class != ELFCLASS64 && class != ELFCLASS32)
>> +		return -EINVAL;
>> +
>> +	rproc->elf_class = class;
>> +	rproc->elf_machine = machine;
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(rproc_coredump_set_elf_info);
>> +
>>  /**
>>   * rproc_coredump() - perform coredump
>>   * @rproc:	rproc handle
>> @@ -1584,6 +1606,11 @@ static void rproc_coredump(struct rproc *rproc)
>>  	if (list_empty(&rproc->dump_segments))
>>  		return;
>>  
>> +	if (class == ELFCLASSNONE) {
>> +		dev_err(&rproc->dev, "Elf class is not set\n");
>> +		return;
>> +	}
>> +
>>  	data_size = elf_size_of_hdr(class);
>>  	list_for_each_entry(segment, &rproc->dump_segments, node) {
>>  		data_size += elf_size_of_phdr(class) + segment->size;
>> @@ -1602,7 +1629,7 @@ static void rproc_coredump(struct rproc *rproc)
>>  	elf_hdr_init_ident(ehdr, class);
>>  
>>  	elf_hdr_set_e_type(class, ehdr, ET_CORE);
>> -	elf_hdr_set_e_machine(class, ehdr, EM_NONE);
>> +	elf_hdr_set_e_machine(class, ehdr, rproc->elf_machine);
>>  	elf_hdr_set_e_version(class, ehdr, EV_CURRENT);
>>  	elf_hdr_set_e_entry(class, ehdr, rproc->bootaddr);
>>  	elf_hdr_set_e_phoff(class, ehdr, elf_size_of_hdr(class));
>> @@ -2043,7 +2070,8 @@ struct rproc *rproc_alloc(struct device *dev, const char
>> *name,
>>  	rproc->name = name;
>>  	rproc->priv = &rproc[1];
>>  	rproc->auto_boot = true;
>> -	rproc->elf_class = ELFCLASS32;
>> +	rproc->elf_class = ELFCLASSNONE;
>> +	rproc->elf_machine = EM_NONE;
>>  
>>  	device_initialize(&rproc->dev);
>>  	rproc->dev.parent = dev;
>> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c
>> b/drivers/remoteproc/remoteproc_elf_loader.c
>> index 16e2c496fd45..4869fb7d8fe4 100644
>> --- a/drivers/remoteproc/remoteproc_elf_loader.c
>> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
>> @@ -248,9 +248,6 @@ int rproc_elf_load_segments(struct rproc *rproc, const
>> struct firmware *fw)
>>  			memset(ptr + filesz, 0, memsz - filesz);
>>  	}
>>  
>> -	if (ret == 0)
>> -		rproc->elf_class = class;
>> -
>>  	return ret;
>>  }
>>  EXPORT_SYMBOL(rproc_elf_load_segments);
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index ed127b2d35ca..d67eb5a40476 100644
>> --- a/include/linux/remoteproc.h
>> +++ b/include/linux/remoteproc.h
>> @@ -515,6 +515,7 @@ struct rproc {
>>  	struct list_head dump_segments;
>>  	int nb_vdev;
>>  	u8 elf_class;
>> +	u16 elf_machine;
>>  };
> 
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> 
>>  
>>  /**
>> @@ -619,6 +620,7 @@ int rproc_coredump_add_custom_segment(struct rproc *rproc,
>>  						     struct rproc_dump_segment *segment,
>>  						     void *dest),
>>  				      void *priv);
>> +int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine);
>>  
>>  static inline struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev)
>>  {
>> --
>> 2.17.1