linux-kernel - Re: [PATCH 1/2] pci: pci_bridge_release

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Message-ID: <1260222126.5477.11.camel@pLaptop>
Date:	Mon, 07 Dec 2009 14:42:06 -0700
From:	Patrick Keller <patrick.keller@...com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Chiang, Alexander" <achiang@...com>,
	"Helgaas, Bjorn" <bjorn.helgaas@...com>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH 1/2] pci: pci_bridge_release_res



On Tue, 2009-12-01 at 01:19 +0000, Yinghai Lu wrote:
> need to apply this after 9/9 patchset
> 
> prepare for pciehp_realloc
> 
> it will clear the resource size for bridge
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  drivers/pci/setup-bus.c |   42 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/pci.h     |    1 +
>  2 files changed, 43 insertions(+)
> 
> Index: linux-2.6/drivers/pci/setup-bus.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/setup-bus.c
> +++ linux-2.6/drivers/pci/setup-bus.c
> @@ -739,6 +739,48 @@ static void __ref __pci_bridge_assign_re
>  		break;
>  	}
>  }
> +
> +void pci_bridge_release_res(struct pci_bus *bus)
> +{
> +	int idx;
> +	bool changed = false;
> +	struct pci_dev *dev;
> +	struct resource *r;
> +
> +	/* The root bus? */
> +	if (!bus->self)
> +		return;
> +
> +	/* for pci bridges res only */
> +	dev = bus->self;
> +	if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
> +		return;
> +
> +	for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_BRIDGE_RESOURCES + 3;
> +	     idx++) {
> +		r = &dev->resource[idx];
> +		if (!r->parent)
> +			continue;
> +
> +		/* if there are children under that, we should not release it */
> +		if (r->child)
> +			continue;
> +
> +		if (!release_resource(r)) {
> +			dev_printk(KERN_DEBUG, &dev->dev,
> +				 "resource %d %pR released\n", idx, r);
> +			/* old size is not kept */
> +			r->start = 0;
> +			r->end   = 0;
> +			r->flags = 0;
> +			changed = true;
> +		}
> +	}
> +
> +	if (changed)
> +		pci_setup_bridge(bus);
> +}
> +

Need to add EXPORT_SYMBOL(pci_bridge_release_res); here so the hotplug
kernel module will find this function.

>  static void release_children_resource(struct resource *r)
>  {
>  	struct resource *p;
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -767,6 +767,7 @@ int pci_vpd_truncate(struct pci_dev *dev
>  void pci_bus_assign_resources(const struct pci_bus *bus);
>  void pci_bus_size_bridges(struct pci_bus *bus);
>  int pci_claim_resource(struct pci_dev *, int);
> +void pci_bridge_release_res(struct pci_bus *bus);
>  void pci_assign_unassigned_resources(void);
>  void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
>  void pdev_enable_device(struct pci_dev *);
> --
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