[Qemu-devel] [RFC PATCH 08/15] spapr: create DR connectors for PHBs and register reset hooks

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

Since we route hotplugged PHBs to their DR connector using their
PHB.index value, we align the number of DR connectors with the
maximum index value: SPAPR_PCI_MAX_INDEX.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index c8ad5b0..c539932 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -90,6 +90,9 @@
 
 #define HTAB_SIZE(spapr)        (1ULL << ((spapr)->htab_shift))
 
+/* maximum number of hotpluggable PHBs */
+#define SPAPR_DRC_MAX_PHB       (SPAPR_PCI_MAX_INDEX + 1)
+
 typedef struct sPAPRMachineClass sPAPRMachineClass;
 typedef struct sPAPRMachineState sPAPRMachineState;
 
@@ -1387,6 +1390,16 @@ static SaveVMHandlers savevm_htab_handlers = {
     .load_state = htab_load,
 };
 
+static void spapr_drc_reset(void *opaque)
+{
+    sPAPRDRConnector *drc = opaque;
+    DeviceState *d = DEVICE(drc);
+
+    if (d) {
+        device_reset(d);
+    }
+}
+
 /* pSeries LPAR / sPAPR hardware init */
 static void ppc_spapr_init(MachineState *machine)
 {
@@ -1561,6 +1574,21 @@ static void ppc_spapr_init(MachineState *machine)
 
     spapr->dr_phb_enabled = smc->dr_phb_enabled;
 
+    /* Setup hotplug / dynamic-reconfiguration connectors. top-level
+     * connectors (described in root DT node's "ibm,drc-types" property)
+     * are pre-initialized here. additional child connectors (such as
+     * connectors for a PHBs PCI slots) are added as needed during their
+     * parent's realization.
+     */
+    if (spapr->dr_phb_enabled) {
+        for (i = 0; i < SPAPR_DRC_MAX_PHB; i++) {
+            sPAPRDRConnector *drc =
+                spapr_dr_connector_new(OBJECT(machine),
+                                       SPAPR_DR_CONNECTOR_TYPE_PHB, i);
+            qemu_register_reset(spapr_drc_reset, drc);
+        }
+    }
+
     /* Set up PCI */
     spapr_pci_rtas_init();
 
-- 
1.9.1