[Qemu-devel] [RFC PATCH 13/15] spapr_pci: provide node start offset via spapr_populate_pci_dt()

[Michael Roth <mdroth@linux.vnet.ibm.com>]

PHB hotplug re-uses PHB device tree generation code and passes
it to a guest via RTAS. Doing this requires knowledge of where
exactly in the device tree the node describing the PHB begins.

Provide this via a new optional pointer that can be used to
store the PHB node's start offset.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c              | 2 +-
 hw/ppc/spapr_pci.c          | 6 +++++-
 include/hw/pci-host/spapr.h | 3 ++-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 042e7a9..ecf40e4 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -767,7 +767,7 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
     }
 
     QLIST_FOREACH(phb, &spapr->phbs, list) {
-        ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt);
+        ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt, NULL);
     }
 
     if (ret < 0) {
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index e37de28..66fe85f 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1534,7 +1534,8 @@ PCIHostState *spapr_create_phb(sPAPREnvironment *spapr, int index)
 
 int spapr_populate_pci_dt(sPAPRPHBState *phb,
                           uint32_t xics_phandle,
-                          void *fdt)
+                          void *fdt,
+                          int *node_offset)
 {
     int bus_off, i, j, ret;
     char nodename[256];
@@ -1578,6 +1579,9 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
     if (bus_off < 0) {
         return bus_off;
     }
+    if (node_offset) {
+        *node_offset = bus_off;
+    }
 
     /* Write PHB properties */
     _FDT(fdt_setprop_string(fdt, bus_off, "device_type", "pci"));
diff --git a/include/hw/pci-host/spapr.h b/include/hw/pci-host/spapr.h
index 9dca388..32a9213 100644
--- a/include/hw/pci-host/spapr.h
+++ b/include/hw/pci-host/spapr.h
@@ -126,7 +126,8 @@ PCIHostState *spapr_create_phb(sPAPREnvironment *spapr, int index);
 
 int spapr_populate_pci_dt(sPAPRPHBState *phb,
                           uint32_t xics_phandle,
-                          void *fdt);
+                          void *fdt,
+                          int *node_offset);
 
 void spapr_pci_msi_init(sPAPREnvironment *spapr, hwaddr addr);
 
-- 
1.9.1