ppc/pnv: Discard internal BMC initialization when BMC is external

The PowerNV machine can be run with an external IPMI BMC device
connected to a remote QEMU machine acting as BMC, using these options :

  -chardev socket,id=ipmi0,host=localhost,port=9002,reconnect=10 \
  -device ipmi-bmc-extern,id=bmc0,chardev=ipmi0 \
  -device isa-ipmi-bt,bmc=bmc0,irq=10 \
  -nodefaults

In that case, some aspects of the BMC initialization should be
skipped, since they rely on the simulator interface.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20210126171059.307867-6-clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 14 insertions, 1 deletions

diff --git a/hw/ppc/pnv_bmc.c b/hw/ppc/pnv_bmc.c
index 86d16b4935..b9bf5735ea 100644
--- a/hw/ppc/pnv_bmc.c
+++ b/hw/ppc/pnv_bmc.c
@@ -51,6 +51,11 @@ typedef struct OemSel {
 #define SOFT_OFF        0x00
 #define SOFT_REBOOT     0x01
 
+static bool pnv_bmc_is_simulator(IPMIBmc *bmc)
+{
+    return object_dynamic_cast(OBJECT(bmc), TYPE_IPMI_BMC_SIMULATOR);
+}
+
 static void pnv_gen_oem_sel(IPMIBmc *bmc, uint8_t reboot)
 {
     /* IPMI SEL Event are 16 bytes long */
@@ -79,6 +84,10 @@ void pnv_dt_bmc_sensors(IPMIBmc *bmc, void *fdt)
     const struct ipmi_sdr_compact *sdr;
     uint16_t nextrec;
 
+    if (!pnv_bmc_is_simulator(bmc)) {
+        return;
+    }
+
     offset = fdt_add_subnode(fdt, 0, "bmc");
     _FDT(offset);
 
@@ -243,6 +252,10 @@ static const IPMINetfn hiomap_netfn = {
 
 void pnv_bmc_set_pnor(IPMIBmc *bmc, PnvPnor *pnor)
 {
+    if (!pnv_bmc_is_simulator(bmc)) {
+        return;
+    }
+
     object_ref(OBJECT(pnor));
     object_property_add_const_link(OBJECT(bmc), "pnor", OBJECT(pnor));
 
@@ -286,7 +299,7 @@ static int bmc_find(Object *child, void *opaque)
 
 IPMIBmc *pnv_bmc_find(Error **errp)
 {
-    ForeachArgs args = { TYPE_IPMI_BMC_SIMULATOR, NULL };
+    ForeachArgs args = { TYPE_IPMI_BMC, NULL };
     int ret;
 
     ret = object_child_foreach_recursive(object_get_root(), bmc_find, &args);