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

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Message-ID: <CAFpQJXXESn1EA5kotVOH2oLbRUSpOLf6+MeWG1pY_GhUP+4vVQ@mail.gmail.com>
Date:	Tue, 19 Jan 2016 11:28:56 +0530
From:	Ganapatrao Kulkarni <gpkulkarni@...il.com>
To:	David Daney <ddaney.cavm@...il.com>,
	Will Deacon <Will.Deacon@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...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 <linuxppc-dev@...ts.ozlabs.org>,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Leif Lindholm <leif.lindholm@...aro.org>, rfranz@...ium.com,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"msalter@...hat.com" <msalter@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Steve Capper <steve.capper@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Al Stone <al.stone@...aro.org>, Arnd Bergmann <arnd@...db.de>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	tony.luck@...el.com, fenghua.yu@...el.com, james.hogan@...tec.com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org,
	Jon Masters <jonathan@...masters.org>,
	Robert Richter <rrichter@...ium.com>,
	Prasun Kapoor <Prasun.Kapoor@...iumnetworks.com>
Subject: Re: [PATCH v9 5/6] PCI: generic: Make pci-host-generic driver numa aware

On Mon, Jan 18, 2016 at 11:11 PM, David Daney <ddaney.cavm@...il.com> wrote:
> On 01/18/2016 08:36 AM, 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));
>
>
> This shouldn't be done in individual platform_drivers, but instead in the
> device probing code.
>
> There is code that does this in drivers/of/platform.c and
> drivers/of/device.c  Is that not being called for the pci-host-gweneric
> devices?  If not, we should figure out why, and perhaps attempt to fix it
> rather than doing it here.
is it more appropriate to call of_platform_device_create ?

--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -24,6 +24,7 @@
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
 #include <linux/platform_device.h>
+#include <linux/of_platform.h>

 struct gen_pci;

@@ -466,7 +467,7 @@ 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));
+       of_platform_device_create(np, NULL, NULL);
        pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
        if (!pci)
                return -ENOMEM;

>
>
>
>> +       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);
>>
>
thanks
Ganapat