linux-kernel - Re: [PATCH v1] misc: fastrpc: Move fastrpc driver to misc/fastrpc/

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Message-ID: <zbpia232dh4ojfsvhcqxrp6cwfygaalu5cycdrs47pqmnrisvk@dq24nww26gkm>
Date: Wed, 12 Jun 2024 21:28:39 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>, 
	Oded Gabbay <ogabbay@...nel.org>
Cc: srinivas.kandagatla@...aro.org, linux-arm-msm@...r.kernel.org, 
	gregkh@...uxfoundation.org, quic_bkumar@...cinc.com, linux-kernel@...r.kernel.org, 
	quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v1] misc: fastrpc: Move fastrpc driver to misc/fastrpc/

On Wed, Jun 12, 2024 at 12:17:28PM +0530, Ekansh Gupta wrote:
> Move fastrpc.c from misc/ to misc/fastrpc/. New C files are planned
> to be added for PD notifications and other missing features. Adding
> and maintaining new files from within fastrpc directory would be easy.
> 
> Example of feature that is being planned to be introduced in a new C
> file:
> https://lore.kernel.org/all/20240606165939.12950-6-quic_ekangupt@quicinc.com/
> 
> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
> ---
>  MAINTAINERS                          |  2 +-
>  drivers/misc/Kconfig                 | 13 +------------
>  drivers/misc/Makefile                |  2 +-
>  drivers/misc/fastrpc/Kconfig         | 16 ++++++++++++++++
>  drivers/misc/fastrpc/Makefile        |  2 ++
>  drivers/misc/{ => fastrpc}/fastrpc.c |  0
>  6 files changed, 21 insertions(+), 14 deletions(-)
>  create mode 100644 drivers/misc/fastrpc/Kconfig
>  create mode 100644 drivers/misc/fastrpc/Makefile
>  rename drivers/misc/{ => fastrpc}/fastrpc.c (100%)

Please consider whether it makes sense to move to drivers/accel instead
(and possibly writing a better Kconfig entry, specifying that the driver
is to be used to offload execution to the DSP).

> diff --git a/MAINTAINERS b/MAINTAINERS
> index d6c90161c7bf..e9c79e9063f8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -18501,7 +18501,7 @@ M:	Amol Maheshwari <amahesh@....qualcomm.com>
>  L:	linux-arm-msm@...r.kernel.org
>  S:	Maintained
>  F:	Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> -F:	drivers/misc/fastrpc.c
> +F:	drivers/misc/fastrpc/
>  F:	include/uapi/misc/fastrpc.h
>  
>  QUALCOMM HEXAGON ARCHITECTURE
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index faf983680040..630e8ccd8669 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -276,18 +276,6 @@ config QCOM_COINCELL
>  	  to maintain PMIC register and RTC state in the absence of
>  	  external power.
>  
> -config QCOM_FASTRPC
> -	tristate "Qualcomm FastRPC"
> -	depends on ARCH_QCOM || COMPILE_TEST
> -	depends on RPMSG
> -	select DMA_SHARED_BUFFER
> -	select QCOM_SCM
> -	help
> -	  Provides a communication mechanism that allows for clients to
> -	  make remote method invocations across processor boundary to
> -	  applications DSP processor. Say M if you want to enable this
> -	  module.
> -
>  config SGI_GRU
>  	tristate "SGI GRU driver"
>  	depends on X86_UV && SMP
> @@ -602,4 +590,5 @@ source "drivers/misc/cardreader/Kconfig"
>  source "drivers/misc/uacce/Kconfig"
>  source "drivers/misc/pvpanic/Kconfig"
>  source "drivers/misc/mchp_pci1xxxx/Kconfig"
> +source "drivers/misc/fastrpc/Kconfig"
>  endmenu
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> index 153a3f4837e8..f83d73844ea5 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -16,7 +16,6 @@ obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
>  obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
>  obj-$(CONFIG_PHANTOM)		+= phantom.o
>  obj-$(CONFIG_QCOM_COINCELL)	+= qcom-coincell.o
> -obj-$(CONFIG_QCOM_FASTRPC)	+= fastrpc.o
>  obj-$(CONFIG_SENSORS_BH1770)	+= bh1770glc.o
>  obj-$(CONFIG_SENSORS_APDS990X)	+= apds990x.o
>  obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
> @@ -69,3 +68,4 @@ obj-$(CONFIG_TMR_INJECT)	+= xilinx_tmr_inject.o
>  obj-$(CONFIG_TPS6594_ESM)	+= tps6594-esm.o
>  obj-$(CONFIG_TPS6594_PFSM)	+= tps6594-pfsm.o
>  obj-$(CONFIG_NSM)		+= nsm.o
> +obj-y				+= fastrpc/
> diff --git a/drivers/misc/fastrpc/Kconfig b/drivers/misc/fastrpc/Kconfig
> new file mode 100644
> index 000000000000..3243dc56b2a0
> --- /dev/null
> +++ b/drivers/misc/fastrpc/Kconfig
> @@ -0,0 +1,16 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# Qualcomm FastRPC devices
> +#
> +
> +config QCOM_FASTRPC
> +	tristate "Qualcomm FastRPC"
> +	depends on ARCH_QCOM || COMPILE_TEST
> +	depends on RPMSG
> +	select DMA_SHARED_BUFFER
> +	select QCOM_SCM
> +	help
> +	  Provides a communication mechanism that allows for clients to
> +	  make remote method invocations across processor boundary to
> +	  applications DSP processor. Say M if you want to enable this
> +	  module.
> \ No newline at end of file
> diff --git a/drivers/misc/fastrpc/Makefile b/drivers/misc/fastrpc/Makefile
> new file mode 100644
> index 000000000000..77fd2b763b6b
> --- /dev/null
> +++ b/drivers/misc/fastrpc/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_QCOM_FASTRPC)	+= fastrpc.o
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc/fastrpc.c
> similarity index 100%
> rename from drivers/misc/fastrpc.c
> rename to drivers/misc/fastrpc/fastrpc.c
> -- 
> 2.43.0
> 

-- 
With best wishes
Dmitry