linux-kernel - Re: [PATCH v5 06/19] PCI/MSI: of: Allow msi_domain lookup using the host bridge node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 23 Jul 2015 08:13:36 -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 06/19] PCI/MSI: of: Allow msi_domain lookup using the
 host bridge node

On Thu, Jul 23, 2015 at 10:26:25AM +0100, Marc Zyngier wrote:
> A number of platforms do not need to use the msi-parent property,
> as the host bridge itself provides the MSI controller.
> 
> Allow this configuration by performing an irq domain lookup based
> on the host bridge node if it doesn't have a valid msi-parent property.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

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

> ---
>  drivers/pci/of.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index e2ebb7d..fcfdadf 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -69,12 +69,21 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
>  
>  	if (!bus->dev.of_node)
>  		return NULL;
> +
> +	/* Start looking for a phandle to an MSI controller. */
>  	np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
> +
> +	/*
> +	 * If we don't have an msi-parent property, look for a domain
> +	 * directly attached to the host bridge.
> +	 */
>  	if (!np)
> -		return NULL;
> +		np = bus->dev.of_node;
> +
>  	d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
>  	if (!d)
>  		d = irq_find_host(np);
> +
>  	return d;
>  #else
>  	return NULL;
> -- 
> 2.1.4
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/