[patch 11/52] genirq/irqdomain: Add force reactivation flag to irq domains

[Thomas Gleixner]

Allow irqdomains to tell the core code, that after early activation the
interrupt needs to be reactivated at request_irq() time.

This allows reservation of vectors at early activation time and actual
vector assignment at request_irq() time.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 include/linux/msi.h |    5 +++++
 kernel/irq/msi.c    |    2 ++
 2 files changed, 7 insertions(+)

Index: b/include/linux/msi.h
===================================================================
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -283,6 +283,11 @@ enum {
 	MSI_FLAG_PCI_MSIX		= (1 << 3),
 	/* Needs early activate, required for PCI */
 	MSI_FLAG_ACTIVATE_EARLY		= (1 << 4),
+	/*
+	 * Must reactivate when irq is started even when
+	 * MSI_FLAG_ACTIVATE_EARLY has been set.
+	 */
+	MSI_FLAG_MUST_REACTIVATE	= (1 << 5),
 };
 
 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
Index: b/kernel/irq/msi.c
===================================================================
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -403,6 +403,8 @@ int msi_domain_alloc_irqs(struct irq_dom
 			ret = irq_domain_activate_irq(irq_data, true);
 			if (ret)
 				goto cleanup;
+			if (info->flags & MSI_FLAG_MUST_REACTIVATE)
+				irqd_clr_activated(irq_data);
 		}
 	}
 	return 0;