[PATCH] s390 update (20/27): signal quiesce.

Add 'signal quiesque' feature to s390 hardware console. A signal quiesce
is sent from VM or the service element every time the system should shut
down. We receive the quiesce signal and call ctrl_alt_del(). Finally the
mainframes have ctrl-alt-del as well :-)

diff --git a/drivers/s390/char/hwc.h b/drivers/s390/char/hwc.h
index da0ed495c4dc0b8551e12db5e6fcb8958e27bcd3..d8c3b062fb81144b6cd914fbbc62f52b2589be76 100644 (file)
--- a/drivers/s390/char/hwc.h
+++ b/drivers/s390/char/hwc.h
@@ -22,6 +22,7 @@
 #define ET_PMsgCmd             0x09
 #define ET_CntlProgOpCmd       0x20
 #define ET_CntlProgIdent       0x0B
+#define ET_SigQuiesce  0x1D
 
 #define ET_OpCmd_Mask  0x80000000
 #define ET_Msg_Mask            0x40000000
@@ -29,6 +30,7 @@
 #define ET_PMsgCmd_Mask        0x00800000
 #define ET_CtlProgOpCmd_Mask   0x00000001
 #define ET_CtlProgIdent_Mask   0x00200000
+#define ET_SigQuiesce_Mask     0x00000008
 
 #define GMF_DOM                0x8000
 #define GMF_SndAlrm    0x4000
@@ -218,7 +220,8 @@ static init_hwcb_t init_hwcb_template =
        0x0000,
        0x0000,
        sizeof (_hwcb_mask_t),
-       ET_OpCmd_Mask | ET_PMsgCmd_Mask | ET_StateChange_Mask,
+       ET_OpCmd_Mask | ET_PMsgCmd_Mask |
+       ET_StateChange_Mask | ET_SigQuiesce_Mask,
        ET_Msg_Mask | ET_PMsgCmd_Mask | ET_CtlProgIdent_Mask
 };
 

diff --git a/drivers/s390/char/hwc_rw.c b/drivers/s390/char/hwc_rw.c
index 0959d609d1cd3d98c89e256ed21d1156f9565625..3097fc1775f9ff858356b1b3e2ad5efba9a753a8 100644 (file)
--- a/drivers/s390/char/hwc_rw.c
+++ b/drivers/s390/char/hwc_rw.c
@@ -35,6 +35,8 @@
 #define MIN(a,b) (((a<b) ? a : b))
 #endif
 
+extern void ctrl_alt_del (void);
+
 #define HWC_RW_PRINT_HEADER "hwc low level driver: "
 
 #define  USE_VM_DETECTION
@@ -172,6 +174,7 @@ static struct {
        unsigned char read_nonprio:1;
        unsigned char read_prio:1;
        unsigned char read_statechange:1;
+       unsigned char sig_quiesce:1;
 
        unsigned char flags;
 
@@ -222,6 +225,7 @@ static struct {
            0,
            0,
            0,
+           0,
            NULL,
            NULL
 
@@ -1529,6 +1533,19 @@ eval_hwc_send_mask (_hwcb_mask_t mask)
                                       HWC_RW_PRINT_HEADER
                                 "can not read state change notifications\n");
 
+       hwc_data.sig_quiesce
+           = ((mask & ET_SigQuiesce_Mask) == ET_SigQuiesce_Mask);
+       if (hwc_data.sig_quiesce)
+               internal_print (
+                                      DELAYED_WRITE,
+                                      HWC_RW_PRINT_HEADER
+                                      "can receive signal quiesce\n");
+       else
+               internal_print (
+                                      DELAYED_WRITE,
+                                      HWC_RW_PRINT_HEADER
+                                      "can not receive signal quiesce\n");
+
        hwc_data.read_nonprio
            = ((mask & ET_OpCmd_Mask) == ET_OpCmd_Mask);
        if (hwc_data.read_nonprio)
@@ -1609,6 +1626,47 @@ eval_statechangebuf (statechangebuf_t * scbuf)
        return retval;
 }
 
+#ifdef CONFIG_SMP
+static volatile unsigned long cpu_quiesce_map;
+
+static void 
+do_load_quiesce_psw (void)
+{
+       psw_t quiesce_psw;
+
+       clear_bit (smp_processor_id (), &cpu_quiesce_map);
+       if (smp_processor_id () == 0) {
+
+               while (cpu_quiesce_map != 0) ;
+
+               quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
+               quiesce_psw.addr = 0xfff;
+               __load_psw (quiesce_psw);
+       }
+       signal_processor (smp_processor_id (), sigp_stop);
+}
+
+static void 
+do_machine_quiesce (void)
+{
+       cpu_quiesce_map = cpu_online_map;
+       smp_call_function (do_load_quiesce_psw, NULL, 0, 0);
+       do_load_quiesce_psw ();
+}
+
+#else
+static void 
+do_machine_quiesce (void)
+{
+       psw_t quiesce_psw;
+
+       quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
+       queisce_psw.addr = 0xfff;
+       __load_psw (quiesce_psw);
+}
+
+#endif
+
 static int 
 process_evbufs (void *start, void *end)
 {
@@ -1644,6 +1702,13 @@ process_evbufs (void *start, void *end)
                        retval += eval_statechangebuf
                            ((statechangebuf_t *) evbuf);
                        break;
+               case ET_SigQuiesce:
+
+                       _machine_restart = do_machine_quiesce;
+                       _machine_halt = do_machine_quiesce;
+                       _machine_power_off = do_machine_quiesce;
+                       ctrl_alt_del ();
+                       break;
                default:
                        internal_print (
                                               DELAYED_WRITE,