From 2ff73dda02d8a467ab56a0e497df7888a15af0c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@kaod.org>
Date: Fri, 17 Dec 2021 17:57:19 +0100
Subject: ppc/pnv: Use QOM hierarchy to scan PHB3 devices
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When -nodefaults is supported for PHB3 devices, the phbs array under
the chip will be empty. This will break the XICSFabric handlers, and
all interrupt delivery, and the 'info pic' HMP command.

Do a QOM loop on the chip children and look for PHB3 devices instead.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20211213132830.108372-7-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/ppc/pnv.c | 72 +++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 54 insertions(+), 18 deletions(-)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index c97fe77..e75fc99 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -638,16 +638,25 @@ static ISABus *pnv_isa_create(PnvChip *chip, Error **errp)
     return PNV_CHIP_GET_CLASS(chip)->isa_create(chip, errp);
 }
 
+static int pnv_chip_power8_pic_print_info_child(Object *child, void *opaque)
+{
+    Monitor *mon = opaque;
+    PnvPHB3 *phb3 = (PnvPHB3 *) object_dynamic_cast(child, TYPE_PNV_PHB3);
+
+    if (phb3) {
+        pnv_phb3_msi_pic_print_info(&phb3->msis, mon);
+        ics_pic_print_info(&phb3->lsis, mon);
+    }
+    return 0;
+}
+
 static void pnv_chip_power8_pic_print_info(PnvChip *chip, Monitor *mon)
 {
     Pnv8Chip *chip8 = PNV8_CHIP(chip);
-    int i;
 
     ics_pic_print_info(&chip8->psi.ics, mon);
-    for (i = 0; i < chip->num_phbs; i++) {
-        pnv_phb3_msi_pic_print_info(&chip8->phbs[i].msis, mon);
-        ics_pic_print_info(&chip8->phbs[i].lsis, mon);
-    }
+    object_child_foreach(OBJECT(chip),
+                         pnv_chip_power8_pic_print_info_child, mon);
 }
 
 static void pnv_chip_power9_pic_print_info(PnvChip *chip, Monitor *mon)
@@ -1789,10 +1798,32 @@ PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir)
     return NULL;
 }
 
+typedef struct ForeachPhb3Args {
+    int irq;
+    ICSState *ics;
+} ForeachPhb3Args;
+
+static int pnv_ics_get_child(Object *child, void *opaque)
+{
+    ForeachPhb3Args *args = opaque;
+    PnvPHB3 *phb3 = (PnvPHB3 *) object_dynamic_cast(child, TYPE_PNV_PHB3);
+
+    if (phb3) {
+        if (ics_valid_irq(&phb3->lsis, args->irq)) {
+            args->ics = &phb3->lsis;
+        }
+        if (ics_valid_irq(ICS(&phb3->msis), args->irq)) {
+            args->ics = ICS(&phb3->msis);
+        }
+    }
+    return args->ics ? 1 : 0;
+}
+
 static ICSState *pnv_ics_get(XICSFabric *xi, int irq)
 {
     PnvMachineState *pnv = PNV_MACHINE(xi);
-    int i, j;
+    ForeachPhb3Args args = { irq, NULL };
+    int i;
 
     for (i = 0; i < pnv->num_chips; i++) {
         PnvChip *chip = pnv->chips[i];
@@ -1801,32 +1832,37 @@ static ICSState *pnv_ics_get(XICSFabric *xi, int irq)
         if (ics_valid_irq(&chip8->psi.ics, irq)) {
             return &chip8->psi.ics;
         }
-        for (j = 0; j < chip->num_phbs; j++) {
-            if (ics_valid_irq(&chip8->phbs[j].lsis, irq)) {
-                return &chip8->phbs[j].lsis;
-            }
-            if (ics_valid_irq(ICS(&chip8->phbs[j].msis), irq)) {
-                return ICS(&chip8->phbs[j].msis);
-            }
+
+        object_child_foreach(OBJECT(chip), pnv_ics_get_child, &args);
+        if (args.ics) {
+            return args.ics;
         }
     }
     return NULL;
 }
 
+static int pnv_ics_resend_child(Object *child, void *opaque)
+{
+    PnvPHB3 *phb3 = (PnvPHB3 *) object_dynamic_cast(child, TYPE_PNV_PHB3);
+
+    if (phb3) {
+        ics_resend(&phb3->lsis);
+        ics_resend(ICS(&phb3->msis));
+    }
+    return 0;
+}
+
 static void pnv_ics_resend(XICSFabric *xi)
 {
     PnvMachineState *pnv = PNV_MACHINE(xi);
-    int i, j;
+    int i;
 
     for (i = 0; i < pnv->num_chips; i++) {
         PnvChip *chip = pnv->chips[i];
         Pnv8Chip *chip8 = PNV8_CHIP(pnv->chips[i]);
 
         ics_resend(&chip8->psi.ics);
-        for (j = 0; j < chip->num_phbs; j++) {
-            ics_resend(&chip8->phbs[j].lsis);
-            ics_resend(ICS(&chip8->phbs[j].msis));
-        }
+        object_child_foreach(OBJECT(chip), pnv_ics_resend_child, NULL);
     }
 }
 
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