ppc/pnv: Compute the PHB index from the PHB4 PEC model

Use the num_stacks class attribute to compute the PHB index depending
on the PEC index :

  * PEC0 provides 1 PHB  (PHB0)
  * PEC1 provides 2 PHBs (PHB1 and PHB2)
  * PEC2 provides 3 PHBs (PHB3, PHB4 and PHB5)

The routine pnv_pec_phb_offset() is a bit complex but it also prepares
ground for PHB5 which has a different layout of stacks: 3 per PECs.

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20211213132830.108372-12-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 293909b5cb..a7dd4173d5 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -374,6 +374,19 @@ static void pnv_pec_instance_init(Object *obj)
     }
 }
 
+static int pnv_pec_phb_offset(PnvPhb4PecState *pec)
+{
+    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
+    int index = pec->index;
+    int offset = 0;
+
+    while (index--) {
+        offset += pecc->num_stacks[index];
+    }
+
+    return offset;
+}
+
 static void pnv_pec_realize(DeviceState *dev, Error **errp)
 {
     PnvPhb4PecState *pec = PNV_PHB4_PEC(dev);
@@ -394,8 +407,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
     for (i = 0; i < pec->num_stacks; i++) {
         PnvPhb4PecStack *stack = &pec->stacks[i];
         Object *stk_obj = OBJECT(stack);
+        int phb_id = pnv_pec_phb_offset(pec) + i;
 
         object_property_set_int(stk_obj, "stack-no", i, &error_abort);
+        object_property_set_int(stk_obj, "phb-id", phb_id, &error_abort);
         object_property_set_link(stk_obj, "pec", OBJECT(pec), &error_abort);
         if (!qdev_realize(DEVICE(stk_obj), NULL, errp)) {
             return;
@@ -538,6 +553,7 @@ static void pnv_pec_stk_instance_init(Object *obj)
     PnvPhb4PecStack *stack = PNV_PHB4_PEC_STACK(obj);
 
     object_initialize_child(obj, "phb", &stack->phb, TYPE_PNV_PHB4);
+    object_property_add_alias(obj, "phb-id", OBJECT(&stack->phb), "index");
 }
 
 static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)