linux-kernel - Re: [PATCH v3 5/7] PCI: irqdomain: Look up IRQ domain by fwnode

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Date:	Tue, 27 Oct 2015 15:10:35 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	jakeo@...rosoft.com, gregkh@...uxfoundation.org, kys@...rosoft.com,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
	tglx@...utronix.de, haiyangz@...rosoft.com, marc.zyngier@....com,
	bhelgaas@...gle.com, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3 5/7] PCI: irqdomain: Look up IRQ domain by
 fwnode_handle



On 2015/10/27 7:15, jakeo@...rosoft.com wrote:
> From: Jake Oshins <jakeo@...rosoft.com>
> 
> The existing PCI code looks for an IRQ domain associated with a root PCI bus
> by looking in the Open Firmware tree.  This patch introduces a second way
> to identify the associated IRQ domain, if the lookup in the OF tree fails.
> The handle used for the IRQ domain lookup was introduced in the previous patch
> in the series.
> 
> Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
> ---
>  drivers/pci/probe.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index c0f2e44..62c9ac7 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -664,6 +664,7 @@ static void pci_set_bus_speed(struct pci_bus *bus)
>  static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
>  {
>  	struct irq_domain *d;
> +	struct pci_host_bridge *host_bridge;
>  
>  	/*
>  	 * Any firmware interface that can resolve the msi_domain
> @@ -671,6 +672,18 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
>  	 */
>  	d = pci_host_bridge_of_msi_domain(bus);
>  
> +	/*
> +	 * If no IRQ domain was found via the OF tree, try looking it up
> +	 * directly through the fwnode_handle.
> +	 */
> +	if (!d) {
> +		host_bridge = to_pci_host_bridge(bus->bridge);
> +		if (host_bridge->fwnode) {
> +			d = irq_find_matching_fwnode(host_bridge->fwnode,
> +						     DOMAIN_BUS_ANY);
Should we use DOMAIN_BUS_PCI_MSI instead here?

> +		}
> +	}
> +
>  	return d;
>  }
>  
> 
--
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