linux-kernel - Re: [PATCH v10 5/7] PCI: irqdomain: Look up IRQ domain by fwnode

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Date:	Thu, 10 Dec 2015 18:12:45 +0000
From:	Marc Zyngier <marc.zyngier@....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, bhelgaas@...gle.com,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v10 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

On 10/12/15 17:53, jakeo@...rosoft.com wrote:
> From: Jake Oshins <jakeo@...rosoft.com>
> 
> This patch adds a second way of finding an IRQ domain associated with
> a root PCI bus.  After looking to see if one can be found through
> the OF tree, it attempts to look up the IRQ domain through an
> fwnode_handle stored in the pci_sysdata struct.
> 
> Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
> ---
>  drivers/pci/probe.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 750f907..c6369dd 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -674,6 +674,20 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
>  	 */
>  	d = pci_host_bridge_of_msi_domain(bus);
>  
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +	/*
> +	 * If no IRQ domain was found via the OF tree, try looking it up
> +	 * directly through the fwnode_handle.
> +	 */
> +	if (!d) {
> +		struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
> +
> +		if (fwnode)
> +			d = irq_find_matching_fwnode(fwnode,
> +						     DOMAIN_BUS_PCI_MSI);
> +	}
> +#endif
> +
>  	return d;
>  }
>  
> 

Reviewed-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...
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