[PULL 2/5] pnv_phb4_pec: Keep track of instantiated PHBs

[Daniel Henrique Barboza <danielhb413@gmail.com>]

From: Frederic Barrat <fbarrat@linux.ibm.com>

Add an array on the PEC object to keep track of the PHBs which are
instantiated. The array can be sparsely populated when using
user-created PHBs. It will be useful for the next patch to only export
instantiated PHBs in the device tree.

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20230302163715.129635-2-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb4_pec.c     | 12 +++++++-----
 hw/ppc/pnv.c                   |  1 +
 include/hw/pci-host/pnv_phb4.h |  2 ++
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 43267a428f..97c06bb0a0 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -112,9 +112,9 @@ static const MemoryRegionOps pnv_pec_pci_xscom_ops = {
     .endianness = DEVICE_BIG_ENDIAN,
 };
 
-static void pnv_pec_default_phb_realize(PnvPhb4PecState *pec,
-                                        int stack_no,
-                                        Error **errp)
+static PnvPHB *pnv_pec_default_phb_realize(PnvPhb4PecState *pec,
+                                           int stack_no,
+                                           Error **errp)
 {
     PnvPHB *phb = PNV_PHB(qdev_new(TYPE_PNV_PHB));
     int phb_id = pnv_phb4_pec_get_phb_id(pec, stack_no);
@@ -128,8 +128,9 @@ static void pnv_pec_default_phb_realize(PnvPhb4PecState *pec,
                             &error_fatal);
 
     if (!sysbus_realize(SYS_BUS_DEVICE(phb), errp)) {
-        return;
+        return NULL;
     }
+    return phb;
 }
 
 static void pnv_pec_realize(DeviceState *dev, Error **errp)
@@ -148,8 +149,9 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
 
     /* Create PHBs if running with defaults */
     if (defaults_enabled()) {
+        g_assert(pec->num_phbs <= MAX_PHBS_PER_PEC);
         for (i = 0; i < pec->num_phbs; i++) {
-            pnv_pec_default_phb_realize(pec, i, errp);
+            pec->phbs[i] = pnv_pec_default_phb_realize(pec, i, errp);
         }
     }
 
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 44b1fbbc93..24bf8461d6 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -314,6 +314,7 @@ static PnvPhb4PecState *pnv_phb4_get_pec(PnvChip *chip, PnvPHB4 *phb,
 
         for (j = 0; j < pec->num_phbs; j++) {
             if (index == pnv_phb4_pec_get_phb_id(pec, j)) {
+                pec->phbs[j] = phb->phb_base;
                 return pec;
             }
         }
diff --git a/include/hw/pci-host/pnv_phb4.h b/include/hw/pci-host/pnv_phb4.h
index 28d61b96c7..0b72ef1471 100644
--- a/include/hw/pci-host/pnv_phb4.h
+++ b/include/hw/pci-host/pnv_phb4.h
@@ -185,6 +185,8 @@ struct PnvPhb4PecState {
 
     /* PHBs */
     uint32_t num_phbs;
+#define MAX_PHBS_PER_PEC        3
+    PnvPHB *phbs[MAX_PHBS_PER_PEC];
 
     PnvChip *chip;
 };
-- 
2.39.2