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authorMarc Zyngier <marc.zyngier@arm.com>2015-10-02 14:43:06 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2015-10-16 13:07:16 +0100
commit54fa97eeb9e22b47d68b67ee00987afa7fbc2178 (patch)
treebf5cbab9a60df9291dcc92592f21a1c52cc593ee /include/linux/msi.h
parent098259eb16675a83e1d6ea31e06dc3ec152810a2 (diff)
PCI/MSI: Allow the MSI domain to be device-specific
So far, we've always considered that for a given PCI device, its MSI controller was either set by the architecture-specific pcibios hook, or simply inherited from the host bridge. This doesn't cover things like firmware-defined topologies like msi-map (DT) or IORT (ACPI), which can provide information about which MSI controller to use on a per-device basis. This patch adds the necessary hook into the MSI code to allow this feature, and provides the msi-map functionnality as a first implementation. Acked-by: Rob Herring <robh@kernel.org> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'include/linux/msi.h')
-rw-r--r--include/linux/msi.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 87723751054d..0b4460374020 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -295,6 +295,12 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
int pci_msi_domain_check_cap(struct irq_domain *domain,
struct msi_domain_info *info, struct device *dev);
u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
+struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
+#else
+static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
+{
+ return NULL;
+}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
#endif /* LINUX_MSI_H */