linux-kernel - Re: [PATCH v3] PCI: Xilinx-NWL-PCIe: Added support for Xilinx NWL PCIe Host Controller

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Date:	Fri, 09 Oct 2015 10:02:39 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	Michal Simek <michals@...inx.com>,
	Soren Brinkmann <sorenb@...inx.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"tinamdar@....com" <tinamdar@....com>,
	"treding@...dia.com" <treding@...dia.com>,
	"rjui@...adcom.com" <rjui@...adcom.com>,
	"Minghuan.Lian@...escale.com" <Minghuan.Lian@...escale.com>,
	"m-karicheri2@...com" <m-karicheri2@...com>,
	"hauke@...ke-m.de" <hauke@...ke-m.de>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ravikiran Gummaluri <rgummal@...inx.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] PCI: Xilinx-NWL-PCIe: Added support for Xilinx NWL
 PCIe Host Controller

On 09/10/15 09:51, Bharat Kumar Gogada wrote:
>> On 09/10/15 06:11, Bharat Kumar Gogada wrote:
>>>>>> +struct nwl_msi {                  /* struct nwl_msi - MSI information
>>>> */
>>>>>> +  struct msi_controller chip;     /* chip: MSI controller */
>>>>>
>>>>>> We're moving away from msi_controller altogether, as the kernel now
>>>>>> has all the necessary infrastructure to do this properly.
>>>>>
>>>>> Our current GIC version does not have separate msi controller (we
>>>>> are not using GICv2m or GICv3), so is it necessary to have separate
>>>>> msi controller node ? Please give me clarity on this.
>>>>
>>>> This has nothing to do with the version of the GIC you are using
>>>> (XGene doesn't have GICv2m or v3 either). This is about reducing code
>>>> duplication and having something that we can maintain. See also
>>>> https://lkml.org/lkml/2015/9/20/193 for yet another example.
>>>>
>>>> I still plan to kill msi_controller, and I'd like to avoid more
>>>> dependencies with it. MSI domains are the way to do it.
>>>>
>>> Sorry previously I haven't configured my email client properly so resending.
>>
>> Thanks for doing so, much appreciated.
>>
>>> Since we don't have separate MSI controller, and our PCIe controller
>>> is handling MSI, is it necessary to create a separate MSI controller
>>> node because we don't have any 'reg' space.
>>
>> No, your PCI controller can perfectly be part of the PCIe node.
> You meant 'msi-controller' property to be part of PCIe node?

Yeah, sorry. Too early, not enough coffee.

>>
>>> Please let me know whether we require a separate msi file as suggested
>>> in your previous comments to separate MSI controller and PCIE
>>> controller in two files, if we don't have separate node. If we do not
>>> need a separate node do we need to embed MSI controller child node  in
>>> PCIe controller node itself, and what properties does this child node
>>> will require other than 'interrupts'.
>>
>> If you want to keep them in the same file, please at least have two separate
>> patches. These are two different functions, and they should be reviewed
>> separately.
>>
> What I meant is if we don't have separate msi node do we need separate file? 

That's up to you. Nodes and source code files don't have to match at all.

> If you meant msi controller to be part of same node then we will use single file and will
> try to have two separate patches.

That's fine by me.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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