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PCI/MSI: Add support for OF-provided msi_domain

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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.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-6-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Marc Zyngier 2015-07-28 14:46:12 +01:00 • committed by Thomas Gleixner
parent 44aa0c657e
commit b165e2b60b
3 changed files with 33 additions and 1 deletions
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25
drivers/pci/of.c
View file

@ -9,6 +9,7 @@
* 2 of the License, or (at your option) any later version.
*/
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/of.h>
@ -59,3 +60,27 @@ struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
return of_node_get(bus->bridge->parent->of_node);
return NULL;
}
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;
/* Start looking for a phandle to an MSI controller. */
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)
return d;
return irq_find_host(np);
#else
return NULL;
#endif
}