linux-kernel - Re: [RFC v2] fpga: dfl: RFC PCI config

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Message-ID: <20200701051000.GB2186@yilunxu-OptiPlex-7050>
Date:   Wed, 1 Jul 2020 13:10:01 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     trix@...hat.com
Cc:     hao.wu@...el.com, mdf@...nel.org, corbet@....net,
        linux-fpga@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v2] fpga: dfl: RFC PCI config

On Tue, Jun 30, 2020 at 11:49:50AM -0700, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> Create some top level configs the map to dfl pci cards.
> 
> Autoselect the parts of fpga that are needed to run these cards
> as well as the defining the other subsystem dependencies.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  v1 change subsystem selects to depends
> 
>  Documentation/fpga/dfl.rst | 30 ++++++++++++++++++++++++++++++
>  drivers/fpga/Kconfig       | 27 +++++++++++++++++++++++++++
>  2 files changed, 57 insertions(+)
> 
> diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
> index d7648d7c7eee..c1ae6b539f08 100644
> --- a/Documentation/fpga/dfl.rst
> +++ b/Documentation/fpga/dfl.rst
> @@ -500,6 +500,36 @@ Developer only needs to provide a sub feature driver with matched feature id.
>  FME Partial Reconfiguration Sub Feature driver (see drivers/fpga/dfl-fme-pr.c)
>  could be a reference.
>  
> +Kernel configuration
> +====================
> +
> +While it is possible to manually setup a configuration to match your device,
> +there are some top level configurations that collect configurations for
> +some reference PCI cards.  Below describes these configuration as well as
> +what other kernel configs are needed for proper configuration.
> +
> +FPGA_DFL_PAC10
> +Intel Arria 10 GX PCI card, PCI id 0X09C4
> +Depends on
> +  SPI_ALTERA
> +  MFD_INTEL_M10_BMC
> +  SENSORS_INTEL_M10_BMC_HWMON
> +
> +FPGA_DFL_D5005
> +Intel Stratix 10, D5005 PCI card, PCI id 0X0B2B
> +Depends on
> +  SPI_ALTERA
> +  MFD_INTEL_M10_BMC
> +  SENSORS_INTEL_M10_BMC_HWMON
> +  INTEL_S10_PHY
> +
> +FPGA_DFL_N3000
> +Intel Network Accelerator, N3000 PCI card, PCI id 0X0B30
> +Depends on
> +  SPI_ALTERA
> +  MFD_INTEL_M10_BMC
> +  SENSORS_INTEL_M10_BMC_HWMON
> +  INTEL_LL_10G_MAC
>  
>  Open discussion
>  ===============
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 9d53bd9094e2..96603b1f6ff5 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -138,6 +138,33 @@ config OF_FPGA_REGION
>  	  Support for loading FPGA images by applying a Device Tree
>  	  overlay.
>  
> +config FPGA_DFL_PAC10
> +	tristate "Intel Arria 10 GX PCI card"
> +	depends on SPI_ALTERA
> +	depends on SENSORS_INTEL_M10_BMC_HWMON
> +	depends on MFD_INTEL_M10_BMC
> +	select FPGA_DFL
> +	select FPGA_DFL_FME
> +	select FPGA_DFL_FME_MGR
> +	select FPGA_DFL_FME_BRIDGE
> +	select FPGA_DFL_FME_REGION
> +	select FPGA_DFL_AFU
> +	select FPGA_DFL_SPI_ALTERA
> +	select FPGA_DFL_PCI

FPGA_DFL_PCI depends on PCI, seems we also cannot select it.

> +	select IFPGA_SEC_MGR

Since there is concern we cannot select all the configs, and now we have
some "depends on"s, some "select"s. It means people should manually
find and select the "depends on"s, then the helper config could appear
and be selected to finish the rest of selection.
IMHO seems this config is not as valuable as expected ...

> +
> +config FPGA_DFL_D5005
> +	tristate "Intel Stratix 10, D5005 PCI card"
> +	depends on INTEL_S10_PHY
> +	select FPGA_DFL_PAC10
> +	select FPGA_DFl_HSSI
> +
> +config FPGA_DFL_N3000
> +	tristate "Intel Network Accelerator, N3000 PCI card"
> +	depends on INTEL_LL_10G_MAC
> +	select FPGA_DFL_PAC10
> +	select FPGA_DFL_N3000_NIOS
> +
>  config FPGA_DFL
>  	tristate "FPGA Device Feature List (DFL) support"
>  	select FPGA_BRIDGE
> -- 
> 2.18.1