From: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
In the pci_scan_root_bus, pci_bus is created and passed down to:
pci_scan_child_bus
pci_scan_bridge
pci_add_new_bus
pci_alloc_child_bus
In pci_alloc_child_bus, the parent's msi_chip is propagated to child,
and the referenced by PCI devices when calling arch_setup_msi_irq().
However, in the current implementation of pci_scan_root_bus, the msi_chip
of the root_bus is not set before handing off to pci_scan_child_bus.
This patch proposes a new callback function in the struct pci_ops
to allow host controller to provide a call back for specifying
msi_chip to be used.
Cc: Bjorn Helgass <bhelg...@google.com>
Cc: Liviu Dudau <liviu.du...@arm.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
drivers/pci/probe.c | 3 +++
include/linux/pci.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 5ed9930..cf7114d 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2081,6 +2081,9 @@ struct pci_bus *pci_scan_root_bus(struct device *parent,
int bus,
if (!b)
return NULL;
+ if (ops->set_msi_parent)
+ ops->set_msi_parent(b);
+
if (!found) {
dev_info(&b->dev,
"No busn resource found for root bus, will use [bus
%02x-ff]\n",
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5be8db4..6093544 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -560,6 +560,7 @@ static inline int pcibios_err_to_errno(int err)
struct pci_ops {
int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int
size, u32 *val);
int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int
size, u32 val);
+ int (*set_msi_parent)(struct pci_bus *bus);
};
/*
--
1.9.3
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