linux-kernel - Re: [PATCHv1] Add Intel Stratix10 service layer driver

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Date:   Thu, 25 Jan 2018 17:53:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     richard.gong@...ux.intel.com
Cc:     arnd@...db.de, linux-kernel@...r.kernel.org, richard.gong@...el.com
Subject: Re: [PATCHv1] Add Intel Stratix10 service layer driver

On Thu, Jan 25, 2018 at 10:39:03AM -0600, richard.gong@...ux.intel.com wrote:
> From: Richard Gong <richard.gong@...el.com>
> 
> Intel Stratix10 SoC is composed of a 64 bit quad-core ARM Cortex A53 hard
> processor system (HPS) and Secure Device Manager (SDM). SDM is the hardware
> which does the FPGA configuration, QSPI, Crypto and warm reset.
> 
> When the FPGA is configured from HPS, there needs to be a way for HPS to
> notify SDM the location and size of the configuration data. Then SDM will
> get the configuration data from that location and perform the FPGA configuration.
> 
> To meet the whole system security needs and support virtual machine
> requesting communication with SDM, only the secure world of software (EL3,
> Exception Level 3) can interface with SDM. All software entities running
> on other exception levels must channel through the EL3 software whenever it
> needs service from SDM.
> 
> Intel Stratix10 service layer driver is added to provide the service for
> FPGA configuration. Running at privileged exception level (EL1, Exception
> Level 1), Intel Stratix10 service layer driver interfaces with the service
> provider at EL1 (Intel Stratix10 FPGA Manager) and manages secure monitor
> call (SMC) to communicate with secure monitor software at secure monitor
> exception level (EL3).
> 
> Later the Intel Stratix10 service layer driver will be extended to provide
> services for QSPI, Crypto and warm reset.
> 
> Richard Gong (1):
>   driver: misc: add Intel Stratix10 service layer driver
> 
>  drivers/misc/Kconfig                       |   3 +-
>  drivers/misc/Makefile                      |   3 +-
>  drivers/misc/intel-service/Kconfig         |   9 +
>  drivers/misc/intel-service/Makefile        |   2 +
>  drivers/misc/intel-service/intel_service.c | 703 +++++++++++++++++++++++++++++
>  include/linux/intel-service-client.h       | 227 ++++++++++
>  include/linux/intel-service.h              | 122 +++++
>  include/linux/intel-smc.h                  | 246 ++++++++++

Simple questions first:
 - why do you have 3 different .h files for a single .c file?
 - why do you have any public .h files for a single .c file?
 - use the correct SPDX markers for your file licenses, Intel legal
   knows all about this, please follow their rules.
 - why is this in a subdirectory for a single .c file?

thanks,

greg k-h