[RFC v2 2/7] PCI: Allow msi domain set-up at host probing time

Boqun Feng
2021-05-03T14:49:40Z

For GENERIC_MSI_IRQ_DOMAIN drivers, we can set up the msi domain via
dev_set_msi_domain() at probing time, and drivers can use this more
generic way to set up the msi domain for the host bridge.

This is the preparation for ARM64 Hyper-V PCI support.

Originally-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
---
drivers/pci/probe.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 5e71cc5e1b6c..90afa05ab2f1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -828,11 +828,14 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
{
struct irq_domain *d;

+ /* Default set by host bridge driver */
+ d = dev_get_msi_domain(bus->bridge);
/*
* Any firmware interface that can resolve the msi_domain
* should be called from here.
*/
- d = pci_host_bridge_of_msi_domain(bus);
+ if (!d)
+ d = pci_host_bridge_of_msi_domain(bus);
if (!d)
d = pci_host_bridge_acpi_msi_domain(bus);