[XEN v5 02/11] xen/Arm: GICv3: Do not calculate affinity level 3 for AArch32

[Ayan Kumar Halder <ayan.kumar.halder@amd.com>]

Refer ARM DDI 0487I.a ID081822, G8-9817, G8.2.169
Affinity level 3 is not present in AArch32.
Also, refer ARM DDI 0406C.d ID040418, B4-1644, B4.1.106,
Affinity level 3 is not present in Armv7 (ie arm32).
Thus, any access to affinity level 3 needs to be guarded within
"ifdef CONFIG_ARM_64".

Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@amd.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Acked-by: Julien Grall <jgrall@amazon.com>
---
Changes from -

v1 - NA (as it is a new patch)

v2 - NA (as it is a new patch)

v3 - Modified the title. Added Rb.

v4 - Added Ack.

 xen/arch/arm/gic-v3.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 018fa0dfa0..64a76307dd 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -527,7 +527,10 @@ static void gicv3_set_pending_state(struct irq_desc *irqd, bool pending)
 static inline uint64_t gicv3_mpidr_to_affinity(int cpu)
 {
      uint64_t mpidr = cpu_logical_map(cpu);
-     return (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
+     return (
+#ifdef CONFIG_ARM_64
+             MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
+#endif
              MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
              MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8  |
              MPIDR_AFFINITY_LEVEL(mpidr, 0));
@@ -720,7 +723,10 @@ static int __init gicv3_populate_rdist(void)
      * Convert affinity to a 32bit value that can be matched to GICR_TYPER
      * bits [63:32]
      */
-    aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
+    aff = (
+#ifdef CONFIG_ARM_64
+           MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
+#endif
            MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
            MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
            MPIDR_AFFINITY_LEVEL(mpidr, 0));
@@ -972,7 +978,10 @@ static void gicv3_send_sgi_list(enum gic_sgi sgi, const cpumask_t *cpumask)
          * Prepare affinity path of the cluster for which SGI is generated
          * along with SGI number
          */
-        val = (MPIDR_AFFINITY_LEVEL(cluster_id, 3) << 48  |
+        val = (
+#ifdef CONFIG_ARM_64
+               MPIDR_AFFINITY_LEVEL(cluster_id, 3) << 48  |
+#endif
                MPIDR_AFFINITY_LEVEL(cluster_id, 2) << 32  |
                sgi << 24                                  |
                MPIDR_AFFINITY_LEVEL(cluster_id, 1) << 16  |
-- 
2.17.1