[RFC PATCH 2/4] hw/intc: add helper function to determine gicv3 redistributor size

[Leif Lindholm <leif@nuviainc.com>]

GICv3 sets aside 128K for each redistributor block, whereas GICv4 sets
aside 256K. To enable use of the gicv3 model for gicv4, abstract this
away as the helper function gicv3_redist_size() and replace the current
hardcoded locations with calls to this function.

Signed-off-by: Leif Lindholm <leif@nuviainc.com>
---
 hw/intc/arm_gicv3_common.c         |  2 +-
 hw/intc/arm_gicv3_redist.c         | 13 +++++++++----
 include/hw/intc/arm_gicv3_common.h |  3 +++
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/hw/intc/arm_gicv3_common.c b/hw/intc/arm_gicv3_common.c
index 7365d24873..a8510b39a1 100644
--- a/hw/intc/arm_gicv3_common.c
+++ b/hw/intc/arm_gicv3_common.c
@@ -299,7 +299,7 @@ void gicv3_init_irqs_and_mmio(GICv3State *s, qemu_irq_handler handler,
 
         memory_region_init_io(&s->iomem_redist[i], OBJECT(s),
                               ops ? &ops[1] : NULL, s, name,
-                              s->redist_region_count[i] * GICV3_REDIST_SIZE);
+                              s->redist_region_count[i] * gicv3_redist_size(s));
         sysbus_init_mmio(sbd, &s->iomem_redist[i]);
         g_free(name);
     }
diff --git a/hw/intc/arm_gicv3_redist.c b/hw/intc/arm_gicv3_redist.c
index 8645220d61..544f4d82ff 100644
--- a/hw/intc/arm_gicv3_redist.c
+++ b/hw/intc/arm_gicv3_redist.c
@@ -14,6 +14,11 @@
 #include "trace.h"
 #include "gicv3_internal.h"
 
+int gicv3_redist_size(GICv3State *s)
+{
+    return (s->revision == 3 ? GICV3_REDIST_SIZE : GICV4_REDIST_SIZE);
+}
+
 static uint32_t mask_group(GICv3CPUState *cs, MemTxAttrs attrs)
 {
     /* Return a 32-bit mask which should be applied for this set of 32
@@ -429,8 +434,8 @@ MemTxResult gicv3_redist_read(void *opaque, hwaddr offset, uint64_t *data,
      * want to allow splitting of redistributor pages into several
      * blocks so we can support more CPUs.
      */
-    cpuidx = offset / 0x20000;
-    offset %= 0x20000;
+    cpuidx = offset / gicv3_redist_size(s);
+    offset %= gicv3_redist_size(s);
     assert(cpuidx < s->num_cpu);
 
     cs = &s->cpu[cpuidx];
@@ -486,8 +491,8 @@ MemTxResult gicv3_redist_write(void *opaque, hwaddr offset, uint64_t data,
      * want to allow splitting of redistributor pages into several
      * blocks so we can support more CPUs.
      */
-    cpuidx = offset / 0x20000;
-    offset %= 0x20000;
+    cpuidx = offset / gicv3_redist_size(s);
+    offset %= gicv3_redist_size(s);
     assert(cpuidx < s->num_cpu);
 
     cs = &s->cpu[cpuidx];
diff --git a/include/hw/intc/arm_gicv3_common.h b/include/hw/intc/arm_gicv3_common.h
index 91491a2f66..ab88d14867 100644
--- a/include/hw/intc/arm_gicv3_common.h
+++ b/include/hw/intc/arm_gicv3_common.h
@@ -37,6 +37,7 @@
 #define GICV3_MAXSPI (GICV3_MAXIRQ - GIC_INTERNAL)
 
 #define GICV3_REDIST_SIZE 0x20000
+#define GICV4_REDIST_SIZE (GICV3_REDIST_SIZE + 0x20000)
 
 /* Number of SGI target-list bits */
 #define GICV3_TARGETLIST_BITS 16
@@ -295,4 +296,6 @@ struct ARMGICv3CommonClass {
 void gicv3_init_irqs_and_mmio(GICv3State *s, qemu_irq_handler handler,
                               const MemoryRegionOps *ops, Error **errp);
 
+int gicv3_redist_size(GICv3State *s);
+
 #endif
-- 
2.20.1