linux-kernel - Re: [PATCH v2 09/29] powerpc/PCI: convert to pci_create_root

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Date:	Fri, 14 Oct 2011 09:34:16 +0200
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/29] powerpc/PCI: convert to pci_create_root_bus()
 for correct root bus resources

On Thu, 2011-10-13 at 22:27 -0600, Bjorn Helgaas wrote:
> Convert from pci_create_bus() to pci_create_root_bus().  This way the root
> bus resources are correct immediately.  This patch doesn't fix anything
> because powerpc fixed them before scanning the bus, but it makes it more
> consistent with other architectures.

All 3 look ok but of course like anything like that, need testing :-) I
won't be able to do that until I'm back to Australia, early November.

Cheers,
Ben.

> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  arch/powerpc/kernel/pci-common.c |   27 ++++++++++++++++-----------
>  1 files changed, 16 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index 942ced2..2dbef49 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -1554,14 +1554,13 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
>  	return pci_enable_resources(dev, mask);
>  }
>  
> -static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
> +static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose, struct list_head *resources)
>  {
> -	struct pci_bus *bus = hose->bus;
>  	struct resource *res;
>  	int i;
>  
>  	/* Hookup PHB IO resource */
> -	bus->resource[0] = res = &hose->io_resource;
> +	res = &hose->io_resource;
>  
>  	if (!res->flags) {
>  		printk(KERN_WARNING "PCI: I/O resource not set for host"
> @@ -1579,6 +1578,7 @@ static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
>  		 (unsigned long long)res->start,
>  		 (unsigned long long)res->end,
>  		 (unsigned long)res->flags);
> +	pci_add_resource(resources, res);
>  
>  	/* Hookup PHB Memory resources */
>  	for (i = 0; i < 3; ++i) {
> @@ -1596,12 +1596,12 @@ static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
>  			res->flags = IORESOURCE_MEM;
>  #endif /* CONFIG_PPC32 */
>  		}
> -		bus->resource[i+1] = res;
>  
>  		pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n", i,
>  			 (unsigned long long)res->start,
>  			 (unsigned long long)res->end,
>  			 (unsigned long)res->flags);
> +		pci_add_resource(resources, res);
>  	}
>  
>  	pr_debug("PCI: PHB MEM offset     = %016llx\n",
> @@ -1695,6 +1695,7 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
>   */
>  void __devinit pcibios_scan_phb(struct pci_controller *hose)
>  {
> +	struct list_head resources;
>  	struct pci_bus *bus;
>  	struct device_node *node = hose->dn;
>  	int mode;
> @@ -1702,22 +1703,26 @@ void __devinit pcibios_scan_phb(struct pci_controller *hose)
>  	pr_debug("PCI: Scanning PHB %s\n",
>  		 node ? node->full_name : "<NO NAME>");
>  
> +	INIT_LIST_HEAD(&resources);
> +
> +	/* Get some IO space for the new PHB */
> +	pcibios_setup_phb_io_space(hose);
> +
> +	/* Wire up PHB bus resources */
> +	pcibios_setup_phb_resources(hose, &resources);
> +
>  	/* Create an empty bus for the toplevel */
> -	bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
> +	bus = pci_create_root_bus(hose->parent, hose->first_busno,
> +				  hose->ops, hose, resources);
>  	if (bus == NULL) {
>  		pr_err("Failed to create bus for PCI domain %04x\n",
>  			hose->global_number);
> +		pci_free_resource_list(&resources);
>  		return;
>  	}
>  	bus->secondary = hose->first_busno;
>  	hose->bus = bus;
>  
> -	/* Get some IO space for the new PHB */
> -	pcibios_setup_phb_io_space(hose);
> -
> -	/* Wire up PHB bus resources */
> -	pcibios_setup_phb_resources(hose);
> -
>  	/* Get probe mode and perform scan */
>  	mode = PCI_PROBE_NORMAL;
>  	if (node && ppc_md.pci_probe_mode)
> 
> --
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