[Qemu-devel] [PATCH 15/21] ppc/pnv: add initial IPMI sensors for the BMC simulator

["Cédric Le Goater" <clg@kaod.org>]

Skiboot, the firmware for the PowerNV platform, expects the BMC to
provide some specific IPMI sensors. These sensors are exposed in the
device tree and their values are updated by the firmware at boot time.

Sensors of interest are :

	"FW Boot Progress"
	"Boot Count"

As such a device is defined on the command line, we can only detect
its presence at reset time.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/ppc/Makefile.objs |  2 +-
 hw/ppc/pnv.c         | 17 +++++++++++
 hw/ppc/pnv_bmc.c     | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/ppc/pnv.h |  7 +++++
 4 files changed, 106 insertions(+), 1 deletion(-)
 create mode 100644 hw/ppc/pnv_bmc.c

diff --git a/hw/ppc/Makefile.objs b/hw/ppc/Makefile.objs
index ef67ea820158..7efc68674819 100644
--- a/hw/ppc/Makefile.objs
+++ b/hw/ppc/Makefile.objs
@@ -6,7 +6,7 @@ obj-$(CONFIG_PSERIES) += spapr_hcall.o spapr_iommu.o spapr_rtas.o
 obj-$(CONFIG_PSERIES) += spapr_pci.o spapr_rtc.o spapr_drc.o spapr_rng.o
 obj-$(CONFIG_PSERIES) += spapr_cpu_core.o spapr_ovec.o
 # IBM PowerNV
-obj-$(CONFIG_POWERNV) += pnv.o pnv_xscom.o pnv_core.o pnv_lpc.o pnv_psi.o pnv_occ.o
+obj-$(CONFIG_POWERNV) += pnv.o pnv_xscom.o pnv_core.o pnv_lpc.o pnv_psi.o pnv_occ.o pnv_bmc.o
 ifeq ($(CONFIG_PCI)$(CONFIG_PSERIES)$(CONFIG_LINUX), yyy)
 obj-y += spapr_pci_vfio.o
 endif
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index dfa1cf849b35..c7caecad0aa6 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -35,6 +35,7 @@
 #include "qapi/visitor.h"
 #include "monitor/monitor.h"
 #include "hw/intc/intc.h"
+#include "hw/ipmi/ipmi.h"
 
 #include "hw/ppc/xics.h"
 #include "hw/ppc/pnv_xscom.h"
@@ -458,16 +459,32 @@ static void *powernv_create_fdt(MachineState *machine)
     }
 
     powernv_populate_isa(pnv->isa_bus, fdt);
+
+    if (pnv->bmc) {
+        pnv_bmc_populate_sensors(pnv->bmc, fdt);
+    }
+
     return fdt;
 }
 
 static void ppc_powernv_reset(void)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
+    PnvMachineState *pnv = POWERNV_MACHINE(machine);
     void *fdt;
 
     qemu_devices_reset();
 
+    /* OpenPOWER systems have a BMC, which can be defined on the
+     * command line with:
+     *
+     *   -device ipmi-bmc-sim,id=bmc0
+     *
+     * This is the internal simulator but it could also be an external
+     * BMC.
+     */
+    pnv->bmc = object_resolve_path_type("", TYPE_IPMI_BMC, NULL);
+
     fdt = powernv_create_fdt(machine);
 
     /* Pack resulting tree */
diff --git a/hw/ppc/pnv_bmc.c b/hw/ppc/pnv_bmc.c
new file mode 100644
index 000000000000..2998530dc4c0
--- /dev/null
+++ b/hw/ppc/pnv_bmc.c
@@ -0,0 +1,81 @@
+/*
+ * QEMU PowerNV, BMC related functions
+ *
+ * Copyright (c) 2016-2017, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/hw.h"
+#include "sysemu/sysemu.h"
+#include "target/ppc/cpu.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "hw/ipmi/ipmi.h"
+#include "hw/ppc/fdt.h"
+
+#include "hw/ppc/pnv.h"
+
+#include <libfdt.h>
+
+/* TODO: include definition in ipmi.h */
+#define IPMI_SDR_FULL_TYPE 1
+
+void pnv_bmc_populate_sensors(Object *bmc, void *fdt)
+{
+    int offset;
+    int i;
+    const struct ipmi_sdr_compact *sdr;
+    uint16_t nextrec;
+
+    offset = fdt_add_subnode(fdt, 0, "/bmc");
+    _FDT(offset);
+
+    _FDT((fdt_setprop_string(fdt, offset, "name", "bmc")));
+    _FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
+    _FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));
+
+    offset = fdt_add_subnode(fdt, offset, "sensors");
+    _FDT(offset);
+
+    _FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
+    _FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));
+
+    for (i = 0; !ipmi_bmc_sdr_find(IPMI_BMC(bmc), i, &sdr, &nextrec); i++) {
+        int off;
+        char *name;
+
+        if (sdr->header.rec_type != IPMI_SDR_COMPACT_TYPE ||
+            sdr->header.rec_type != IPMI_SDR_FULL_TYPE) {
+            continue;
+        }
+
+        name = g_strdup_printf("sensor@%x", sdr->sensor_owner_number);
+        off = fdt_add_subnode(fdt, offset, name);
+        _FDT(off);
+        g_free(name);
+
+        _FDT((fdt_setprop_cell(fdt, off, "reg", sdr->sensor_owner_number)));
+        _FDT((fdt_setprop_string(fdt, off, "name", "sensor")));
+        _FDT((fdt_setprop_string(fdt, off, "compatible", "ibm,ipmi-sensor")));
+        _FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-reading-type",
+                               sdr->reading_type)));
+        _FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-id",
+                               sdr->entity_id)));
+        _FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-instance",
+                               sdr->entity_instance)));
+        _FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-type",
+                               sdr->sensor_type)));
+    }
+}
diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index b45a0d91c813..050763f6cf54 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -130,12 +130,19 @@ typedef struct PnvMachineState {
 
     ISABus       *isa_bus;
     uint32_t     cpld_irqstate;
+
+    Object       *bmc;
 } PnvMachineState;
 
 #define PNV_FDT_ADDR          0x01000000
 #define PNV_TIMEBASE_FREQ     512000000ULL
 
 /*
+ * BMC helpers
+ */
+void pnv_bmc_populate_sensors(Object *objbmc, void *fdt);
+
+/*
  * POWER8 MMIO base addresses
  */
 #define PNV_XSCOM_SIZE        0x800000000ull
-- 
2.7.4