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[patch 44/52] x86/apic/msi: Force reactivation of interrupts at startup time

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  [patch 44/52] x86/apic/msi: Force reactivation of interrupts at  startup time Thomas Gleixner <tglx@linutronix.de> - 2017-09-13 23:40 +0200

#1731905 — [patch 44/52] x86/apic/msi: Force reactivation of interrupts at startup time

MSI(X) interrupts need a valid vector configuration early at allocation
time, i.e. before the PCI core enables MSI(X).

With managed interrupts and the new global reservation scheme, the early
configuration will not assign a real device vector, but a special shutdown
vector. When the irq is started up, then the interrupt must be
reconfigured. Tell the MSI irqdomain core about it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/apic/msi.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -129,7 +129,7 @@ static struct msi_domain_ops pci_msi_dom
 
 static struct msi_domain_info pci_msi_domain_info = {
 	.flags		= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
-			  MSI_FLAG_PCI_MSIX,
+			  MSI_FLAG_PCI_MSIX | MSI_FLAG_MUST_REACTIVATE,
 	.ops		= &pci_msi_domain_ops,
 	.chip		= &pci_msi_controller,
 	.handler	= handle_edge_irq,
@@ -167,7 +167,8 @@ static struct irq_chip pci_msi_ir_contro
 
 static struct msi_domain_info pci_msi_ir_domain_info = {
 	.flags		= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
-			  MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
+			  MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX |
+			  MSI_FLAG_MUST_REACTIVATE,
 	.ops		= &pci_msi_domain_ops,
 	.chip		= &pci_msi_ir_controller,
 	.handler	= handle_edge_irq,

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