[Qemu-ppc] [PATCH 12/15] spapr_pci: provide node start offset via spapr_populate_pci_dt()

[Greg Kurz]

From: Michael Roth <address@hidden>

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 <address@hidden>
Reviewed-by: David Gibson <address@hidden>
Signed-off-by: Greg Kurz <address@hidden>
---
 hw/ppc/spapr.c              |    2 +-
 hw/ppc/spapr_pci.c          |    5 ++++-
 include/hw/pci-host/spapr.h |    2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 4f9d11b14666..5c405a5fafca 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1297,7 +1297,7 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
 
     QLIST_FOREACH(phb, &spapr->phbs, list) {
         ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt,
-                                    spapr->irq->nr_msis);
+                                    spapr->irq->nr_msis, NULL);
         if (ret < 0) {
             error_report("couldn't setup PCI devices in fdt");
             exit(1);
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 292dd95cbef9..5e7b40a8c910 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -2140,7 +2140,7 @@ static void spapr_phb_pci_enumerate(sPAPRPHBState *phb)
 }
 
 int spapr_populate_pci_dt(sPAPRPHBState *phb, uint32_t xics_phandle, void *fdt,
-                          uint32_t nr_msis)
+                          uint32_t nr_msis, int *node_offset)
 {
     int bus_off, i, j, ret;
     gchar *nodename;
@@ -2195,6 +2195,9 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb, uint32_t 
xics_phandle, void *fdt,
     nodename = g_strdup_printf("address@hidden" PRIx64, phb->buid);
     _FDT(bus_off = fdt_add_subnode(fdt, 0, nodename));
     g_free(nodename);
+    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 83d5075a6ef3..6ef8f141ea92 100644
--- a/include/hw/pci-host/spapr.h
+++ b/include/hw/pci-host/spapr.h
@@ -114,7 +114,7 @@ static inline qemu_irq spapr_phb_lsi_qirq(struct 
sPAPRPHBState *phb, int pin)
 }
 
 int spapr_populate_pci_dt(sPAPRPHBState *phb, uint32_t xics_phandle, void *fdt,
-                          uint32_t nr_msis);
+                          uint32_t nr_msis, int *node_offset);
 
 void spapr_pci_rtas_init(void);