[Qemu-devel] [PATCH 16/21] ppc/pnv: generate an OEM SEL event on shutdown

[Cédric Le Goater]

OpenPOWER systems expect to be notified with such an event before a
shutdown or a reboot. An OEM SEL message is sent with specific
identifiers and a user data containing the request : OFF or REBOOT.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 hw/ppc/pnv.c         | 14 ++++++++++++++
 hw/ppc/pnv_bmc.c     | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/hw/ppc/pnv.h |  3 +++
 3 files changed, 59 insertions(+)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index c7caecad0aa6..df0a88c3e252 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -467,6 +467,15 @@ static void *powernv_create_fdt(MachineState *machine)
     return fdt;
 }
 
+static void pnv_powerdown_notify(Notifier *n, void *opaque)
+{
+    PnvMachineState *pnv = POWERNV_MACHINE(qdev_get_machine());
+
+    if (pnv->bmc) {
+        pnv_bmc_powerdown(pnv->bmc);
+    }
+}
+
 static void ppc_powernv_reset(void)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
@@ -662,6 +671,11 @@ static void ppc_powernv_init(MachineState *machine)
 
     /* Create an RTC ISA device too */
     rtc_init(pnv->isa_bus, 2000, NULL);
+
+    /* OpenPOWER systems use a IPMI SEL Event message to notify the
+     * host to powerdown */
+    pnv->powerdown_notifier.notify = pnv_powerdown_notify;
+    qemu_register_powerdown_notifier(&pnv->powerdown_notifier);
 }
 
 /*
diff --git a/hw/ppc/pnv_bmc.c b/hw/ppc/pnv_bmc.c
index 2998530dc4c0..d9ed774acbac 100644
--- a/hw/ppc/pnv_bmc.c
+++ b/hw/ppc/pnv_bmc.c
@@ -32,6 +32,48 @@
 /* TODO: include definition in ipmi.h */
 #define IPMI_SDR_FULL_TYPE 1
 
+/*
+ * OEM SEL Event data packet sent by BMC in response of a Read Event
+ * Message Buffer command
+ */
+typedef struct OemSel {
+    /* SEL header */
+    uint8_t id[2];
+    uint8_t type;
+    uint8_t timestamp[4];
+    uint8_t manuf_id[3];
+
+    /* OEM SEL data (6 bytes) follows */
+    uint8_t netfun;
+    uint8_t cmd;
+    uint8_t data[4];
+} OemSel;
+
+#define SOFT_OFF        0x00
+#define SOFT_REBOOT     0x01
+
+static void pnv_gen_oem_sel(Object *obj, uint8_t reboot)
+{
+    /* IPMI SEL Event are 16 bytes long */
+    OemSel sel = {
+        .id        = { 0x55 , 0x55 },
+        .type      = 0xC0, /* OEM */
+        .manuf_id  = { 0x0, 0x0, 0x0 },
+        .timestamp = { 0x0, 0x0, 0x0, 0x0 },
+        .netfun    = 0x3A, /* IBM */
+        .cmd       = 0x04, /* AMI OEM SEL Power Notification */
+        .data      = { reboot, 0xFF, 0xFF, 0xFF },
+    };
+
+    ipmi_bmc_gen_event(IPMI_BMC(obj), (uint8_t *) &sel,
+                       0 /* do not log the event */);
+}
+
+void pnv_bmc_powerdown(Object *obj)
+{
+    pnv_gen_oem_sel(obj, SOFT_OFF);
+}
+
 void pnv_bmc_populate_sensors(Object *bmc, void *fdt)
 {
     int offset;
diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index 050763f6cf54..b70a13bd4175 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -132,6 +132,8 @@ typedef struct PnvMachineState {
     uint32_t     cpld_irqstate;
 
     Object       *bmc;
+
+    Notifier     powerdown_notifier;
 } PnvMachineState;
 
 #define PNV_FDT_ADDR          0x01000000
@@ -141,6 +143,7 @@ typedef struct PnvMachineState {
  * BMC helpers
  */
 void pnv_bmc_populate_sensors(Object *objbmc, void *fdt);
+void pnv_bmc_powerdown(Object *objbmc);
 
 /*
  * POWER8 MMIO base addresses
-- 
2.7.4