ppc/pnv: Introduce a pnv-phb5 device to match root port

We already have the pnv-phb3 and pnv-phb4 devices for POWER8 and
POWER9 respectively. POWER10 uses version 5 of the PHB. It is very
close to the PHB4 from POWER9, at least in our model and we could
almost keep using the PHB4 model. However the matching root port
pnv-phb5-root-port is specific to POWER10 so to avoid confusion as
well as making it easy to introduce differences later, we create a
pnv-phb5 class, which is mostly an alias for pnv-phb4 for now.

With this patch, the command line for a user-created PHB on powernv10
becomes:
  -machine powernv10 -nodefaults -device pnv-phb5 -device pnv-phb5-root-port

Fixes: 623575e16cd5 ("ppc/pnv: Add model for POWER10 PHB5 PCIe Host bridge")
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220310155101.294568-2-fbarrat@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

3 files changed, 17 insertions, 4 deletions

diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index b5b384e9ee..d1a911f988 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -1783,6 +1783,12 @@ static const TypeInfo pnv_phb4_type_info = {
     }
 };
 
+static const TypeInfo pnv_phb5_type_info = {
+    .name          = TYPE_PNV_PHB5,
+    .parent        = TYPE_PNV_PHB4,
+    .instance_size = sizeof(PnvPHB4),
+};
+
 static void pnv_phb4_root_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
@@ -1907,6 +1913,7 @@ static void pnv_phb4_register_types(void)
     type_register_static(&pnv_phb5_root_port_info);
     type_register_static(&pnv_phb4_root_port_info);
     type_register_static(&pnv_phb4_type_info);
+    type_register_static(&pnv_phb5_type_info);
     type_register_static(&pnv_phb4_iommu_memory_region_info);
 }
 
diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 0ab36e9c8f..a0dfa77c84 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -116,7 +116,8 @@ static void pnv_pec_default_phb_realize(PnvPhb4PecState *pec,
                                         int stack_no,
                                         Error **errp)
 {
-    PnvPHB4 *phb = PNV_PHB4(qdev_new(TYPE_PNV_PHB4));
+    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
+    PnvPHB4 *phb = PNV_PHB4(qdev_new(pecc->phb_type));
     int phb_id = pnv_phb4_pec_get_phb_id(pec, stack_no);
 
     object_property_set_link(OBJECT(phb), "pec", OBJECT(pec),
@@ -131,9 +132,7 @@ static void pnv_pec_default_phb_realize(PnvPhb4PecState *pec,
     }
 
     /* Add a single Root port if running with defaults */
-    pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb),
-                             PNV_PHB4_PEC_GET_CLASS(pec)->rp_model);
-
+    pnv_phb_attach_root_port(PCI_HOST_BRIDGE(phb), pecc->rp_model);
 }
 
 static void pnv_pec_realize(DeviceState *dev, Error **errp)
@@ -265,6 +264,7 @@ static void pnv_pec_class_init(ObjectClass *klass, void *data)
     pecc->stk_compat = stk_compat;
     pecc->stk_compat_size = sizeof(stk_compat);
     pecc->version = PNV_PHB4_VERSION;
+    pecc->phb_type = TYPE_PNV_PHB4;
     pecc->num_phbs = pnv_pec_num_phbs;
     pecc->rp_model = TYPE_PNV_PHB4_ROOT_PORT;
 }
@@ -317,6 +317,7 @@ static void pnv_phb5_pec_class_init(ObjectClass *klass, void *data)
     pecc->stk_compat = stk_compat;
     pecc->stk_compat_size = sizeof(stk_compat);
     pecc->version = PNV_PHB5_VERSION;
+    pecc->phb_type = TYPE_PNV_PHB5;
     pecc->num_phbs = pnv_phb5_pec_num_stacks;
     pecc->rp_model = TYPE_PNV_PHB5_ROOT_PORT;
 }
diff --git a/include/hw/pci-host/pnv_phb4.h b/include/hw/pci-host/pnv_phb4.h
index fbcf5bfb55..b02ecdceaa 100644
--- a/include/hw/pci-host/pnv_phb4.h
+++ b/include/hw/pci-host/pnv_phb4.h
@@ -203,6 +203,7 @@ struct PnvPhb4PecClass {
     const char *stk_compat;
     int stk_compat_size;
     uint64_t version;
+    const char *phb_type;
     const uint32_t *num_phbs;
     const char *rp_model;
 };
@@ -211,6 +212,10 @@ struct PnvPhb4PecClass {
  * POWER10 definitions
  */
 
+#define TYPE_PNV_PHB5 "pnv-phb5"
+#define PNV_PHB5(obj) \
+    OBJECT_CHECK(PnvPhb4, (obj), TYPE_PNV_PHB5)
+
 #define PNV_PHB5_VERSION           0x000000a500000001ull
 #define PNV_PHB5_DEVICE_ID         0x0652