[Qemu-devel] [PATCH 1/3] xics: added end-of-interrupt (EOI) handlers

[Alexey Kardashevskiy]

The patch adds EOI handler to process h_eoi RTAS call correctly
for PCI legacy interrupts.

This functionality is going to be used in VFIO later.

Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
 hw/xics.c |   13 +++++++++++++
 hw/xics.h |    4 ++++
 2 files changed, 17 insertions(+)

diff --git a/hw/xics.c b/hw/xics.c
index 668a0d6..d36d62c 100644
--- a/hw/xics.c
+++ b/hw/xics.c
@@ -170,6 +170,7 @@ struct ics_irq_state {
     int sent:1;
     int rejected:1;
     int masked_pending:1;
+    NotifierList eoi_notifier;
 };
 
 struct ics_state {
@@ -309,6 +310,8 @@ static void ics_eoi(struct ics_state *ics, int nr)
     if (irq->type == XICS_LSI) {
         irq->sent = 0;
     }
+
+    notifier_list_notify(&irq->eoi_notifier, NULL);
 }
 
 /*
@@ -536,6 +539,7 @@ struct icp_state *xics_system_init(int nr_irqs)
     for (i = 0; i < nr_irqs; i++) {
         ics->irqs[i].priority = 0xff;
         ics->irqs[i].saved_priority = 0xff;
+        notifier_list_init(&ics->irqs[i].eoi_notifier);
     }
 
     ics->qirqs = qemu_allocate_irqs(ics_set_irq, ics, nr_irqs);
@@ -552,3 +556,12 @@ struct icp_state *xics_system_init(int nr_irqs)
 
     return icp;
 }
+
+void xics_add_eoi_notifier(Notifier *notify, uint32_t srcno)
+{
+    struct ics_state *ics = spapr->icp->ics;
+    struct ics_irq_state *irq = &ics->irqs[srcno - ics->offset];
+
+    notifier_list_add(&irq->eoi_notifier, notify);
+}
+
diff --git a/hw/xics.h b/hw/xics.h
index 2080159..ca75fac 100644
--- a/hw/xics.h
+++ b/hw/xics.h
@@ -27,6 +27,8 @@
 #if !defined(__XICS_H__)
 #define __XICS_H__
 
+#include "notify.h"
+
 #define XICS_IPI        0x2
 
 struct icp_state;
@@ -41,4 +43,6 @@ qemu_irq xics_assign_irq(struct icp_state *icp, int irq,
 
 struct icp_state *xics_system_init(int nr_irqs);
 
+void xics_add_eoi_notifier(Notifier *notify, uint32_t srcno);
+
 #endif /* __XICS_H__ */
-- 
1.7.10.4