linux-kernel - Re: [PATCH v2 04/22] Documentation: PCI: Guide to use pci endpoint configfs

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Date:   Mon, 6 Mar 2017 15:46:15 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        <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 04/22] Documentation: PCI: Guide to use pci endpoint
 configfs

Hi,

On Friday 17 February 2017 10:45 PM, Christoph Hellwig wrote:
> I'm commenting on the configfs layout here instead of the patch with the
> code as the issues are easier to explain that way.  I think the layout
> is a bit confusing and could be cleaner by making use of pre-created
> entries and symlinks.  Here is my suggestion:
> 
> /sys/kernel/config/pci_ep/functions/		
>     .. test/					# a directory for each function driver
>        ... user-specified-name1/
>        ... user-specified-name2
>     .. nvme/
>        ... user-specified-name42/		
> 
> Each directory under /sys/kernel/config/pci_ep/functions/ is owned
> by a function drivers.  Under that function driver's directory you
> can create a directory for each instance of a function driver.  The
> configfs layout is controlled by the function driver.  E.g. your current
> EPF fields would move into the test function driver, while the nvme
> function would expose totally different fields.
> 
> 
> /sys/kernel/config/pci_ep/controllers/
> 	... dwc-0/
> 	    ... function
> 	... dwc-1/
> 	    ... function
> 	... vhost-0/
> 	    ... function
> 
> 	Here you have a directory for each controller that can be bound
> 	to a function.  The directories are pre-created for each
> 	controller port that is EP capable.
> 	Function is a symlink to the function instance above.
> 	Additional parameters might also be present depending on the
> 	EPC driver.

I've changed the configfs entry according to your suggestion. However I've
considered only the generic test function and a standard EP controller and
implemented the configfs in a single file pci-ep-cfs.c. But I think this will
get more complex as we add custom parameters for individual EPC, new functions
etc..

Thanks
Kishon