Re: [PATCH 1/2] remoteproc: add rproc_coredump_set_elf_info

[Mathieu Poirier]

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@xxxxxxxxx>
> ---
>  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
> + *
> + * 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@xxxxxxxxxx>

>  
>  /**
> @@ -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
>