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

Message ID 20210503144635.2297386-3-boqun.feng@gmail.com
State New
Headers show
Series PCI: hv: Support host bridge probing on ARM64 | expand

Commit Message

Boqun Feng May 3, 2021, 2:46 p.m. UTC 
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(-)
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Patch

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);