linux-kernel - Re: [PATCH] arm64: Add architecture support for PCI

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Message-ID: <20140220143829.GA1556@bart.dudau.co.uk>
Date:	Thu, 20 Feb 2014 14:38:29 +0000
From:	Liviu Dudau <liviu@...au.co.uk>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] arm64: Add architecture support for PCI

On Tue, Feb 18, 2014 at 02:33:53PM +0800, Yijing Wang wrote:
> > +#include <linux/init.h>
> > +#include <linux/io.h>
> > +#include <linux/kernel.h>
> > +#include <linux/mm.h>
> > +#include <linux/of_pci.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/slab.h>
> > +
> > +#include <asm/pci-bridge.h>
> > +
> > +
> > +/*
> > + * Return the domain number for this bus
> > + */
> > +int pci_domain_nr(struct pci_bus *bus)
> > +{
> > +	struct pci_host_bridge *bridge = to_pci_host_bridge(bus->bridge);

Hi Yijing,

> 
> Here bus is specific to root bus ? or, what about use find_pci_host_bridge() to get the pci_host_bridge
> instead.

Yes, the call should be to find_pci_host_bridge(). I sort of implied that the
bus is always the root bus, which is obviously not correct. Thanks for pointing it out.

> 
> > +
> > +	if (bridge)
> > +		return bridge->domain_nr;
> > +
> > +	return 0;
> > +}
> > +
> > +int pci_proc_domain(struct pci_bus *bus)
> > +{
> > +	return pci_domain_nr(bus);
> > +}
> > +
> > +/*
> > + * Called after each bus is probed, but before its children are examined
> > + */
> > +void pcibios_fixup_bus(struct pci_bus *bus)
> > +{
> > +	struct pci_dev *dev;
> > +	struct resource *res;
> > +	int i;
> > +
> > +	if (bus->self != NULL) {
> 
> What about use !pci_is_root_bus() ?

Again, good call, will change.

> 
> > +		pci_read_bridge_bases(bus);
> > +
> > +		pci_bus_for_each_resource(bus, res, i) {
> > +			if (!res || !res->flags || res->parent)
> > +				continue;
> > +
> > +			/*
> > +			 * If we are going to reassign everything, we can
> > +			 * shrink the P2P resource to have zero size to
> > +			 * save space
> > +			 */
> > +			if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
> > +				res->flags |= IORESOURCE_UNSET;
> > +				res->start = 0;
> > +				res->end = -1;
> > +				continue;
> > +			}
> > +		}
> > +	}
> > +
> 
> --
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