[Xen-devel] [PATCH v5 17/22] xen/arm: ITS: Initialize physical ITS

[vijay.kilari@xxxxxxxxx]

From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>

Initialize physical ITS driver from GIC v3 driver
if LPIs are supported by hardware

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
---
v5: Made check of its dt node availability before
    setting lpi_supported flag
---
 xen/arch/arm/gic-v3.c |   19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 8c7c5cf..23eb47c 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -714,6 +714,10 @@ static int __cpuinit gicv3_cpu_init(void)
     if ( gicv3_enable_redist() )
         return -ENODEV;
 
+        /* Give LPIs a spin */
+    if ( gicv3_info.lpi_supported )
+        its_cpu_init();
+
     /* Set priority on PPI and SGI interrupts */
     priority = (GIC_PRI_IPI << 24 | GIC_PRI_IPI << 16 | GIC_PRI_IPI << 8 |
                 GIC_PRI_IPI);
@@ -1323,11 +1327,18 @@ static int __init gicv3_init(void)
 
     if ( gicv3_dist_supports_lpis() )
     {
-        gicv3_info.lpi_supported = 1;
-        gicv3_info.nr_event_ids = its_get_nr_event_ids();
+        /*
+         * LPI support is enabled only if HW supports it and
+         * ITS dt node is available
+         */
+        if ( !its_init(&gicv3.rdist_data) )
+        {
+            gicv3_info.lpi_supported = 1;
+            gicv3_info.nr_event_ids = its_get_nr_event_ids();
+        }
+        else
+            gicv3_info.lpi_supported = 0;
     }
-    else
-        gicv3_info.lpi_supported = 0;
 
     gicv3_dist_init();
     res = gicv3_cpu_init();
-- 
1.7.9.5


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