Re: [PATCH v5 5/8] char: rpmb: add RPMB simulation device

[Greg Kroah-Hartman]

On Mon, Jul 18, 2016 at 11:27:50PM +0300, Tomas Winkler wrote:
> This is a simple platform device used for testing
> the RPMB subsystem.
> 
> The module currently supports two configuration options:
> 1. max_wr_blks: for specifying max blocks that can be written
> in a single command
> 2. daunits:  used to set storage capacity in 128K units.
> 
> 
> Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
> ---
> V2: remove .owner setting, it is set automatically
> V3: 1. Add shutdown handler (similar to ufshcd)
>     2. Commit message fix
> V4: Use select RPMB in Kconfg to ensure valid configuration.
> V5: Revamp the code using the sequence command.
> 
>  drivers/char/rpmb/Kconfig    |  10 +
>  drivers/char/rpmb/Makefile   |   1 +
>  drivers/char/rpmb/rpmb_sim.c | 668 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 679 insertions(+)
>  create mode 100644 drivers/char/rpmb/rpmb_sim.c
> 
> diff --git a/drivers/char/rpmb/Kconfig b/drivers/char/rpmb/Kconfig
> index 6794be9fcc5e..c21b3934249f 100644
> --- a/drivers/char/rpmb/Kconfig
> +++ b/drivers/char/rpmb/Kconfig
> @@ -13,3 +13,13 @@ config RPMB_INTF_DEV
>  	help
>  	  Say yes here if you want to access RPMB from user space
>  	  via character device interface /dev/rpmb%d
> +
> +
> +config RPMB_SIM
> +	tristate "RPMB partition device simulator"
> +	default n
> +	select RPMB
> +	select CRYPTO_SHA256
> +	select CRYPTO_HMAC
> +	help
> +	  RPMB partition simulator used for testing the RPMB subsystem

Hm, that's very vague, why would I want this?  Not want this?  Please
provide more information here.

thanks,

greg k-h