linux-kernel - Re: [PATCH v2 01/22] PCI: endpoint: Add EP core layer to enable EP controller and EP functions

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Date:   Fri, 17 Feb 2017 17:07:01 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>
CC:     <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>
Subject: Re: [PATCH v2 01/22] PCI: endpoint: Add EP core layer to enable EP
 controller and EP functions

Hi Joao,

On Friday 17 February 2017 04:56 PM, Joao Pinto wrote:
> 
> Hi Kishon,
> 
> Às 9:50 AM de 2/17/2017, Kishon Vijay Abraham I escreveu:
>> Introduce a new EP core layer in order to support endpoint functions
>> in linux kernel. This comprises of EPC library
>> (Endpoint Controller Library) and EPF library (Endpoint
>> Function Library). EPC library implements functions that is specific
>> to an endpoint controller and EPF library implements functions
>> that is specific to an endpoint function.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  drivers/Makefile                    |    2 +
>>  drivers/pci/Kconfig                 |    1 +
>>  drivers/pci/endpoint/Kconfig        |   21 ++
>>  drivers/pci/endpoint/Makefile       |    6 +
>>  drivers/pci/endpoint/pci-epc-core.c |  548 +++++++++++++++++++++++++++++++++++
>>  drivers/pci/endpoint/pci-epc-mem.c  |  143 +++++++++
>>  drivers/pci/endpoint/pci-epf-core.c |  347 ++++++++++++++++++++++
>>  include/linux/mod_devicetable.h     |   10 +
>>  include/linux/pci-epc.h             |  141 +++++++++
>>  include/linux/pci-epf.h             |  160 ++++++++++
>>  10 files changed, 1379 insertions(+)
>>  create mode 100644 drivers/pci/endpoint/Kconfig
>>  create mode 100644 drivers/pci/endpoint/Makefile
>>  create mode 100644 drivers/pci/endpoint/pci-epc-core.c
>>  create mode 100644 drivers/pci/endpoint/pci-epc-mem.c
>>  create mode 100644 drivers/pci/endpoint/pci-epf-core.c
>>  create mode 100644 include/linux/pci-epc.h
>>  create mode 100644 include/linux/pci-epf.h
>>
>> diff --git a/drivers/Makefile b/drivers/Makefile
>> index f521cb0..a300bb1 100644
>> --- a/drivers/Makefile
>> +++ b/drivers/Makefile
>> @@ -14,7 +14,9 @@ obj-$(CONFIG_GENERIC_PHY)	+= phy/
>>  obj-$(CONFIG_PINCTRL)		+= pinctrl/
>>  obj-$(CONFIG_GPIOLIB)		+= gpio/
>>  obj-y				+= pwm/
>> +
>>  obj-$(CONFIG_PCI)		+= pci/
>> +obj-$(CONFIG_PCI_ENDPOINT)	+= pci/endpoint/
>>  # PCI dwc controller drivers
>>  obj-y				+= pci/dwc/
> 
> Any special reason to include pci/endpoint and pci/dwc in drivers/Makefile
> instead of being inside pci/Makefile? pci/host is still inside pci/Makefile.

CONFIG_PCI enables all the pcie host support. Endpoint support should be
enabled independent of the host support. Moving pci/endpoint inside
pci/Makefile will build endpoint support only if CONFIG_PCI is enabled. For the
same reason kept pci/dwc in drivers/Makefile since dwc drivers can be used
either in host mode or device mode (or both).

Thanks
Kishon