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UPSTREAM: PCI/MSI: Let PCI host bridges declare their reliance on MSI domains

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There is a whole class of host bridges that cannot know whether
MSIs will be provided or not, as they rely on other blocks
to provide the MSI functionnality, using MSI domains.  This is
the case for example on systems that use the ARM GIC architecture.

Introduce a new attribute ('msi_domain') indicating that implicit
dependency, and use this property to set the NO_MSI flag when
no MSI domain is found at probe time.

Link: https://lore.kernel.org/r/20210330151145.997953-11-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
(cherry picked from commit 94e89b1453)
Signed-off-by: Marc Zyngier <mzyngier@google.com>
Change-Id: Ib5a1428aedd03fe484dd9243536687749b1719bf
Bug: 187801341
This commit is contained in:
Marc Zyngier
2021-03-30 16:11:41 +01:00
committed by Marc Zyngier
parent f18c7855df
commit ae6334abd1
2 changed files with 3 additions and 0 deletions
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2
drivers/pci/probe.c
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@@ -924,6 +924,8 @@ 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->msi_domain && !dev_get_msi_domain(&bus->dev))
bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
if (!parent)
set_dev_node(bus->bridge, pcibus_to_node(bus));

1
include/linux/pci.h
View File

@@ -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 msi_domain:1; /* Bridge wants MSI domain */
/* Resource alignment requirements */
resource_size_t (*align_resource)(struct pci_dev *dev,