linux-kernel - Re: [PATCH 10/13] ocxl: Add Makefile and Kconfig

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Message-Id: <c61dd248-4564-5290-d803-4131278f9383@linux.vnet.ibm.com>
Date:   Tue, 9 Jan 2018 16:45:56 +0100
From:   Frederic Barrat <fbarrat@...ux.vnet.ibm.com>
To:     Andrew Donnellan <andrew.donnellan@....ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org, mpe@...erman.id.au,
        alastair@....ibm.com
Subject: Re: [PATCH 10/13] ocxl: Add Makefile and Kconfig



Le 03/01/2018 à 06:48, Andrew Donnellan a écrit :
> On 19/12/17 02:21, Frederic Barrat wrote:
>> OCXL_BASE triggers the platform support needed by the driver.
>>
>> Signed-off-by: Frederic Barrat <fbarrat@...ux.vnet.ibm.com>
>> ---
>>   drivers/misc/Kconfig       |  1 +
>>   drivers/misc/Makefile      |  1 +
>>   drivers/misc/ocxl/Kconfig  | 25 +++++++++++++++++++++++++
>>   drivers/misc/ocxl/Makefile | 10 ++++++++++
>>   4 files changed, 37 insertions(+)
>>   create mode 100644 drivers/misc/ocxl/Kconfig
>>   create mode 100644 drivers/misc/ocxl/Makefile
>>
>> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
>> index f1a5c2357b14..0534f338c84a 100644
>> --- a/drivers/misc/Kconfig
>> +++ b/drivers/misc/Kconfig
>> @@ -508,4 +508,5 @@ source "drivers/misc/mic/Kconfig"
>>   source "drivers/misc/genwqe/Kconfig"
>>   source "drivers/misc/echo/Kconfig"
>>   source "drivers/misc/cxl/Kconfig"
>> +source "drivers/misc/ocxl/Kconfig"
>>   endmenu
>> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
>> index 5ca5f64df478..73326d54e246 100644
>> --- a/drivers/misc/Makefile
>> +++ b/drivers/misc/Makefile
>> @@ -55,6 +55,7 @@ obj-$(CONFIG_CXL_BASE)        += cxl/
>>   obj-$(CONFIG_ASPEED_LPC_CTRL)    += aspeed-lpc-ctrl.o
>>   obj-$(CONFIG_ASPEED_LPC_SNOOP)    += aspeed-lpc-snoop.o
>>   obj-$(CONFIG_PCI_ENDPOINT_TEST)    += pci_endpoint_test.o
>> +obj-$(CONFIG_OCXL)        += ocxl/
>>
>>   lkdtm-$(CONFIG_LKDTM)        += lkdtm_core.o
>>   lkdtm-$(CONFIG_LKDTM)        += lkdtm_bugs.o
>> diff --git a/drivers/misc/ocxl/Kconfig b/drivers/misc/ocxl/Kconfig
>> new file mode 100644
>> index 000000000000..4496b61f48db
>> --- /dev/null
>> +++ b/drivers/misc/ocxl/Kconfig
>> @@ -0,0 +1,25 @@
>> +#
>> +# Open Coherent Accelerator (OCXL) compatible devices
>> +#
>> +
>> +config OCXL_BASE
>> +    bool
>> +    default n
>> +    select PPC_COPRO_BASE
>> +
>> +config OCXL
>> +    tristate "Support for Open Coherent Accelerators (OCXL)"
>> +    depends on PPC_POWERNV && PCI && EEH
>> +    select OCXL_BASE
>> +    default m
>> +    help
>> +
>> +      Select this option to enable driver support for Open
>> +      Coherent Accelerators (OCXL).  OCXL is otherwise known as
>> +      Open Coherent Accelerator Processor Interface (OCAPI).
>> +      OCAPI allows accelerators in FPGAs to be coherently attached
>> +      to a CPU through a Open CAPI link.  This driver enables
>> +      userspace programs to access these accelerators through
>> +      devices found in /dev/ocxl/
> 
> I'd prefer more consistency in how we refer to OpenCAPI. "ocxl" is a 
> driver name that we have purely for historical reasons, it's not really 
> the name of anything else. I know throughout the various specs and code, 
> we use "OCAPI" a lot, but that's not really an abbreviation that should 
> be "user-facing".
> 
> Something like:
> 
> config OCXL
>       tristate "OpenCAPI coherent accelerator support"
>       help
> 
>         Select this option to enable the ocxl driver for Open Coherent
>         Accelerator Processor Interface (OpenCAPI) devices.
> 
>         OpenCAPI allows FPGA and ASIC accelerators to be coherently
>         attached to a CPU over an OpenCAPI link.
> 
>         The ocxl driver enables userspace programs to access these
>         accelerators through devices in /dev/ocxl/.
> 
>         For more information, see http://opencapi.org.
> 
>         If unsure, say N.
> 

Agreed, and stolen.

   Fred


>> +
>> +      If unsure, say N.
>> diff --git a/drivers/misc/ocxl/Makefile b/drivers/misc/ocxl/Makefile
>> new file mode 100644
>> index 000000000000..f75853411cfd
>> --- /dev/null
>> +++ b/drivers/misc/ocxl/Makefile
>> @@ -0,0 +1,10 @@
>> +ccflags-$(CONFIG_PPC_WERROR)    += -Werror
>> +
>> +ocxl-y                += main.o pci.o config.o file.o pasid.o
>> +ocxl-y                += link.o context.o afu_irq.o sysfs.o trace.o
>> +obj-$(CONFIG_OCXL)        += ocxl.o
>> +
>> +# For tracepoints to include our trace.h from tracepoint infrastructure:
>> +CFLAGS_trace.o := -I$(src)
>> +
>> +# ccflags-y += -DDEBUG
>>
>