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[08/13] PCI: MSI: Let PCI host bridges declare their lack of MSI handling

Message ID 20210225151023.3642391-9-maz@kernel.org
State New
Headers show
Series PCI: MSI: Getting rid of msi_controller, and other cleanups | expand

Commit Message

Marc Zyngier Feb. 25, 2021, 3:10 p.m. UTC
From: Thomas Gleixner <tglx@linutronix.de>

Some PCI host bridges cannot deal with MSIs at all. This has
the unfortunate effect of triggering ugly warnings when an end-point
driver requests MSIs.

Instead, let the bridge advertise such lack of MSIs, so that it
can be flagged correctly by the core code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[maz: commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/pci/probe.c | 2 ++
 include/linux/pci.h | 1 +
 2 files changed, 3 insertions(+)
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Patch

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index fb04fc81a8bd..146bd85c037e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -925,6 +925,8 @@  static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 	device_enable_async_suspend(bus->bridge);
 	pci_set_bus_of_node(bus);
 	pci_set_bus_msi_domain(bus);
+	if (bridge->no_msi)
+		bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 
 	if (!parent)
 		set_dev_node(bus->bridge, pcibus_to_node(bus));
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 105ef1a5191e..9db3abf9fd90 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -550,6 +550,7 @@  struct pci_host_bridge {
 	unsigned int	native_dpc:1;		/* OS may use PCIe DPC */
 	unsigned int	preserve_config:1;	/* Preserve FW resource setup */
 	unsigned int	size_windows:1;		/* Enable root bus sizing */
+	unsigned int	no_msi:1;		/* Bridge has no MSI support */
 
 	/* Resource alignment requirements */
 	resource_size_t (*align_resource)(struct pci_dev *dev,