linux-kernel - Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

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Date:	Tue, 30 Sep 2014 20:54:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <Mark.Rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

On Tuesday 30 September 2014 18:48:21 Liviu Dudau wrote:
> > > > > These are the functions I found that refer to pci_sys_data on arm32:
> > > > > 
> > > > > pcibios_add_bus
> > > > > pcibios_remove_bus
> 
> These are only needed if you want to do per HB processing of the bus
> 
> > > > > pcibios_align_resource
> 
> mvebu is the only user of this function.
> 
> > > > > pci_mmap_page_range
> 
> This is only needed when mapping a PCI resource to userspace. Is that your case here?
> 
> > > > > pci_domain_nr
> > > > > pci_proc_domain
> 
> We have equivalent functionality in the generic patches for those.
> 

We clearly don't need those functions for the new drivers, but that's not
the point. The problem is that when you build a kernel that has both
a traditional host bridge driver and a new one in it, you always get those
functions and they get called from the PCI core, with incorrect arguments.

	Arnd
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