[PATCH v5 02/19] PCI: MSI: Register irq domain with specific token

When creating a PCI/MSI domain, tag it with DOMAIN_BUS_PCI_MSI so
that it can be looked-up using irq_find_matching_host().

Signed-off-by: Marc Zyngier <redacted>
---
  drivers/pci/msi.c         | 8 +++++++-
  include/linux/irqdomain.h | 1 +
  2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 373d96e..ef4ec6e 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c

@@ -1273,12 +1273,18 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
  					     struct msi_domain_info *info,
  					     struct irq_domain *parent)
  {
+	struct irq_domain *domain;
+
  	if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
  		pci_msi_domain_update_dom_ops(info);
  	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
  		pci_msi_domain_update_chip_ops(info);

-	return msi_create_irq_domain(node, info, parent);
+	domain = msi_create_irq_domain(node, info, parent);
+	if (domain)
+		domain->bus_token = DOMAIN_BUS_PCI_MSI;
+
+	return domain;
  }

  /**

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 91a83ad..25e9e66 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h

@@ -54,6 +54,7 @@ struct irq_data;
   */
  enum irq_domain_bus_token {
  	DOMAIN_BUS_ANY		= 0,
+	DOMAIN_BUS_PCI_MSI,
  };