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

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Message-Id: <20210503144635.2297386-3-boqun.feng@gmail.com>
Date:   Mon,  3 May 2021 22:46:30 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Marc Zyngier <maz@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-hyperv@...r.kernel.org
Subject: [RFC v2 2/7] PCI: Allow msi domain set-up at host probing time

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@...db.de>
Signed-off-by: Boqun Feng <boqun.feng@...il.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);
 
-- 
2.30.2