[PATCH 10/31] powerpc/pseries/pci: Add support of MSI domains to PHB hotplug

[Cédric Le Goater]

Simply allocate or release the MSI domains when a PHB is inserted in
or removed from the machine.

Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
 arch/powerpc/platforms/pseries/pseries.h   |  1 +
 arch/powerpc/platforms/pseries/msi.c       | 10 ++++++++++
 arch/powerpc/platforms/pseries/pci_dlpar.c |  4 ++++
 3 files changed, 15 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/pseries.h 
b/arch/powerpc/platforms/pseries/pseries.h
index 91cf2afcf423..57bf4c2091e1 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -88,6 +88,7 @@ int pseries_root_bridge_prepare(struct pci_host_bridge 
*bridge);
 
 extern struct pci_controller_ops pseries_pci_controller_ops;
 int pseries_msi_allocate_domains(struct pci_controller *phb);
+void pseries_msi_free_domains(struct pci_controller *phb);
 
 unsigned long pseries_memory_block_size(void);
 
diff --git a/arch/powerpc/platforms/pseries/msi.c 
b/arch/powerpc/platforms/pseries/msi.c
index da9d63a088bb..d1470941cadf 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -733,6 +733,16 @@ int pseries_msi_allocate_domains(struct pci_controller 
*phb)
        return __pseries_msi_allocate_domains(phb, count);
 }
 
+void pseries_msi_free_domains(struct pci_controller *phb)
+{
+       if (phb->msi_domain)
+               irq_domain_remove(phb->msi_domain);
+       if (phb->dev_domain)
+               irq_domain_remove(phb->dev_domain);
+       if (phb->fwnode)
+               irq_domain_free_fwnode(phb->fwnode);
+}
+
 static void rtas_msi_pci_irq_fixup(struct pci_dev *pdev)
 {
        /* No LSI -> leave MSIs (if any) configured */
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c 
b/arch/powerpc/platforms/pseries/pci_dlpar.c
index f9ae17e8a0f4..cf8a2e7a0f2c 100644
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -33,6 +33,8 @@ struct pci_controller *init_phb_dynamic(struct device_node 
*dn)
 
        pci_devs_phb_init_dynamic(phb);
 
+       pseries_msi_allocate_domains(phb);
+
        /* Create EEH devices for the PHB */
        eeh_phb_pe_create(phb);
 
@@ -73,6 +75,8 @@ int remove_phb_dynamic(struct pci_controller *phb)
                }
        }
 
+       pseries_msi_free_domains(phb);
+
        /* Remove the PCI bus and unregister the bridge device from sysfs */
        phb->bus = NULL;
        pci_remove_bus(b);
-- 
2.26.3