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

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Message-ID: <8520D5D51A55D047800579B09414719801690CD0@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:	Fri, 9 Oct 2015 05:11:20 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Marc Zyngier <marc.zyngier@....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

> >> +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.

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.
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'.

Bharat
> Thanks,
>
>       M.
> --
> Jazz is not dead. It just smells funny...


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