[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 <t...@linutronix.de>
---
 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;