ppc/pnv: generate an OEM SEL event on shutdown

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: NCédric Le Goater <clg@kaod.org>
Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

hw/ppc/pnv.c

@@ -485,6 +485,15 @@ 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());
@@ -638,6 +647,11 @@ 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);
 }
 
 /*

hw/ppc/pnv_bmc.c

@@ -32,6 +32,47 @@
 /* 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(IPMIBmc *bmc, 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(bmc, (uint8_t *) &sel, 0 /* do not log the event */);
+}
+
+void pnv_bmc_powerdown(IPMIBmc *bmc)
+{
+    pnv_gen_oem_sel(bmc, SOFT_OFF);
+}
+
 void pnv_bmc_populate_sensors(IPMIBmc *bmc, void *fdt)
 {
     int offset;

include/hw/ppc/pnv.h

@@ -134,6 +134,7 @@ typedef struct PnvMachineState {
     uint32_t     cpld_irqstate;
 
     IPMIBmc      *bmc;
+    Notifier     powerdown_notifier;
 } PnvMachineState;
 
 #define PNV_FDT_ADDR          0x01000000
@@ -143,6 +144,7 @@ typedef struct PnvMachineState {
  * BMC helpers
  */
 void pnv_bmc_populate_sensors(IPMIBmc *bmc, void *fdt);
+void pnv_bmc_powerdown(IPMIBmc *bmc);
 
 /*
  * POWER8 MMIO base addresses