ppc/pnv: add PnvPHB base/proxy device

The PnvPHB device is going to be the base device for all other powernv
PHBs. It consists of a device that has the same user API as the other
PHB, namely being a PCIHostBridge and having chip-id and index
properties. It also has a 'backend' pointer that will be initialized
with the PHB implementation that the device is going to use.

The initialization of the PHB backend is done by checking the PHB
version via a 'version' attribute that can be set via a global machine
property.  The 'version' field will be used to make adjustments based on
the running version, e.g. PHB3 uses a 'chip' reference while PHB4 uses
'pec'. To init the PnvPHB bus we'll rely on helpers for each version.
The version 3 helper is already added (pnv_phb3_bus_init), the PHB4
helper will be added later on.

For now let's add the basic logic of the PnvPHB object, which consists
mostly of pnv_phb_realize() doing all the work of checking the
phb->version set, initializing the proper backend, passing through its
attributes to the chosen backend, finalizing the backend realize and
adding a root port in the end.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220624084921.399219-3-danielhb413@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/hw/pci-host/pnv_phb.h b/hw/pci-host/pnv_phb.h
new file mode 100644
index 0000000..a7cc861
--- /dev/null
+++ b/hw/pci-host/pnv_phb.h
@@ -0,0 +1,39 @@
+/*
+ * QEMU PowerPC PowerNV Proxy PHB model
+ *
+ * Copyright (c) 2022, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#ifndef PCI_HOST_PNV_PHB_H
+#define PCI_HOST_PNV_PHB_H
+
+#include "hw/pci/pcie_host.h"
+#include "hw/pci/pcie_port.h"
+#include "qom/object.h"
+
+typedef struct PnvChip PnvChip;
+typedef struct PnvPhb4PecState PnvPhb4PecState;
+
+struct PnvPHB {
+    PCIExpressHost parent_obj;
+
+    uint32_t chip_id;
+    uint32_t phb_id;
+    uint32_t version;
+    char bus_path[8];
+
+    PnvChip *chip;
+
+    PnvPhb4PecState *pec;
+
+    /* The PHB backend (PnvPHB3, PnvPHB4 ...) being used */
+    Object *backend;
+};
+
+#define TYPE_PNV_PHB "pnv-phb"
+OBJECT_DECLARE_SIMPLE_TYPE(PnvPHB, PNV_PHB)
+
+#endif /* PCI_HOST_PNV_PHB_H */