[Xen-devel] [PATCH 11/18] xen/arm: Suspend/resume GIC on system suspend/resume

[Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>]

GIC state is saved on system suspend by calling gic_suspend
(this function does not change current state of the GIC but only
saves the values of configuration registers).
The state of GIC has to be restored by calling gic_resume, but only
if the gic_suspend has succeeded. If gic_suspend fails, we'll just
restore interrupts configuration and abort suspend.

Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
Signed-off-by: Saeed Nowshadi <saeed.nowshadi@xxxxxxxxxx>
---
 xen/arch/arm/suspend.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/xen/arch/arm/suspend.c b/xen/arch/arm/suspend.c
index 8e8e531d61..b7940fe03f 100644
--- a/xen/arch/arm/suspend.c
+++ b/xen/arch/arm/suspend.c
@@ -117,6 +117,7 @@ static void vcpu_suspend(register_t epoint, register_t cid)
 static long system_suspend(void *data)
 {
     int status;
+    unsigned long flags;
 
     BUG_ON(system_state != SYS_STATE_active);
 
@@ -130,8 +131,21 @@ static long system_suspend(void *data)
         goto resume_nonboot_cpus;
     }
 
+    local_irq_save(flags);
+    status = gic_suspend();
+    if ( status )
+    {
+        system_state = SYS_STATE_resume;
+        goto resume_irqs;
+    }
+
     system_state = SYS_STATE_resume;
 
+    gic_resume();
+
+resume_irqs:
+    local_irq_restore(flags);
+
 resume_nonboot_cpus:
     rcu_barrier();
     enable_nonboot_cpus();
-- 
2.13.0


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