On ARM HW the capability of IRQ remapping is abstracted on MSI controller side. MSI_FLAG_IRQ_REMAPPING is used to advertise this [1]. To have a universal flag to test this capability for different archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses when MSI_FLAG_IRQ_REMAPPING is set. [1] https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1138820.html Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx> --- drivers/pci/msi.c | 15 +++++++++++++++ drivers/pci/probe.c | 3 +++ include/linux/msi.h | 5 ++++- 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index a080f44..dbdb5c3 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1134,6 +1134,21 @@ void *msi_desc_to_pci_sysdata(struct msi_desc *desc) } EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata); +int pci_bus_msi_isolated(struct pci_bus *bus, struct irq_domain *domain) +{ +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN + struct msi_domain_info *info; + + if (!domain) + return 0; + + info = msi_get_domain_info(domain); + if (info->flags & MSI_FLAG_IRQ_REMAPPING) + return 1; +#endif + return 0; +} + #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN /** * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 8004f67..2b9e3ba 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -713,6 +713,9 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus) if (!d) d = pci_host_bridge_msi_domain(b); + if (b == bus && pci_bus_msi_isolated(bus, d)) + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; + dev_set_msi_domain(&bus->dev, d); } diff --git a/include/linux/msi.h b/include/linux/msi.h index 08441b1..04cc749 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -15,6 +15,8 @@ extern int pci_msi_ignore_mask; struct irq_data; struct msi_desc; struct pci_dev; +struct pci_bus; +struct irq_domain; struct platform_msi_priv_data; void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg); void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); @@ -164,6 +166,8 @@ void arch_restore_msi_irqs(struct pci_dev *dev); void default_teardown_msi_irqs(struct pci_dev *dev); void default_restore_msi_irqs(struct pci_dev *dev); +int pci_bus_msi_isolated(struct pci_bus *bus, struct irq_domain *domain); + struct msi_controller { struct module *owner; struct device *dev; @@ -182,7 +186,6 @@ struct msi_controller { #include <linux/irqhandler.h> #include <asm/msi.h> -struct irq_domain; struct irq_domain_ops; struct irq_chip; struct device_node; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
