linux-kernel - Re: [PATCH v9 5/6] PCI: generic: Make pci-host-generic driver numa aware

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Date:	Tue, 26 Jan 2016 14:52:56 -0600
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>
Cc:	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-metag@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-arch@...r.kernel.org,
	Will.Deacon@....com, catalin.marinas@....com,
	grant.likely@...aro.org, leif.lindholm@...aro.org,
	rfranz@...ium.com, ard.biesheuvel@...aro.org, msalter@...hat.com,
	robh+dt@...nel.org, steve.capper@...aro.org, hanjun.guo@...aro.org,
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	marc.zyngier@....com, lorenzo.pieralisi@....com,
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	x86@...nel.org, jonathan@...masters.org, rrichter@...ium.com,
	Prasun.Kapoor@...iumnetworks.com, gpkulkarni@...il.com
Subject: Re: [PATCH v9 5/6] PCI: generic: Make pci-host-generic driver numa
 aware

On Tue, Jan 26, 2016 at 02:50:05PM -0600, Bjorn Helgaas wrote:
> On Mon, Jan 18, 2016 at 10:06:04PM +0530, Ganapatrao Kulkarni wrote:
> > update numa_node of device associated with pci bus.
> > moved down devm_kzalloc to allocate from node memory.
> > 
> > Signed-off-by: Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>
> > ---
> >  drivers/pci/host/pci-host-generic.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> > index 5434c90..0e1ce06 100644
> > --- a/drivers/pci/host/pci-host-generic.c
> > +++ b/drivers/pci/host/pci-host-generic.c
> > @@ -215,11 +215,9 @@ static int gen_pci_probe(struct platform_device *pdev)
> >  	const struct of_device_id *of_id;
> >  	struct device *dev = &pdev->dev;
> >  	struct device_node *np = dev->of_node;
> > -	struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
> > +	struct gen_pci *pci;
> >  	struct pci_bus *bus, *child;
> >  
> > -	if (!pci)
> > -		return -ENOMEM;
> >  
> >  	type = of_get_property(np, "device_type", NULL);
> >  	if (!type || strcmp(type, "pci")) {
> > @@ -230,6 +228,11 @@ static int gen_pci_probe(struct platform_device *pdev)
> >  	of_pci_check_probe_only();
> >  
> >  	of_id = of_match_node(gen_pci_of_match, np);
> > +	set_dev_node(dev, of_node_to_nid(np));
> 
> I like the idea of this patch, but why do we need to call
> set_dev_node() here in driver code?  Shouldn't that be done by the
> OF/platform device infrastructure so that all drivers for platform devices
> get this benefit?

Sorry, I'm just a day late and a dollar short.  I see David and Lorenzo
have already responded about this.

> > +	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
> > +	if (!pci)
> > +		return -ENOMEM;
> > +
> >  	pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;
> >  	pci->host.dev.parent = dev;
> >  	INIT_LIST_HEAD(&pci->host.windows);
> > -- 
> > 1.8.1.4
> > 
> > --
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