linux-kernel - Re: [PATCH v5 05/19] PCI/MSI: of: Add support for OF-provided msi

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Message-ID: <20150723131221.GS21967@google.com>
Date:	Thu, 23 Jul 2015 08:12:21 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Yijing Wang <wangyijing@...wei.com>,
	Ma Jun <majun258@...wei.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Duc Dang <dhdang@....com>
Subject: Re: [PATCH v5 05/19] PCI/MSI: of: Add support for OF-provided
 msi_domain

On Thu, Jul 23, 2015 at 10:26:24AM +0100, Marc Zyngier wrote:
> In order to populate the PCI host bridge msi_domain, use the
> "msi-parent" attribute to lookup a corresponding irq domain.
> If found, this is our MSI domain.
> 
> This gets plugged into the core PCI code.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> +struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
> +{
> +#ifdef CONFIG_IRQ_DOMAIN
> +	struct device_node *np;
> +	struct irq_domain *d;
> +
> +	if (!bus->dev.of_node)
> +		return NULL;
> +	np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
> +	if (!np)
> +		return NULL;
> +	d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
> +	if (!d)
> +		d = irq_find_host(np);
> +	return d;

    d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
    if (d)
	    return d;

    return irq_find_host(np);

> +#else
> +	return NULL;
> +#endif

>  static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
>  {
> +	struct irq_domain *d;
> +
>  	/*
>  	 * Any firmware interface that can resolve the msi_domain
>  	 * should be called from here.
>  	 */
> +	d = pci_host_bridge_of_msi_domain(bus);
>  
> -	return NULL;
> +	return d;

No temporary needed (until there's another firmware interface):

    return pci_host_bridge_of_msi_domain(bus);
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