projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * drivers/s390/char/sclp_quiesce.c | |
| 3 | * signal quiesce handler | |
| 4 | * | |
| 5 | * (C) Copyright IBM Corp. 1999,2004 | |
| 6 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
| 7 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | |
| 8 | */ | |
| 9 | ||
| 1da177e4 LT |
10 | #include <linux/module.h> |
| 11 | #include <linux/types.h> | |
| 12 | #include <linux/cpumask.h> | |
| 13 | #include <linux/smp.h> | |
| 14 | #include <linux/init.h> | |
| 83cc5ed3 | 15 | #include <linux/reboot.h> |
| 1da177e4 LT |
16 | #include <asm/atomic.h> |
| 17 | #include <asm/ptrace.h> | |
| 18 | #include <asm/sigp.h> | |
| 188596fa | 19 | #include <asm/smp.h> |
| 1da177e4 LT |
20 | |
| 21 | #include "sclp.h" | |
| 22 | ||
| 8b94c1ed MS |
23 | static void (*old_machine_restart)(char *); |
| 24 | static void (*old_machine_halt)(void); | |
| 25 | static void (*old_machine_power_off)(void); | |
| 26 | ||
| 1da177e4 | 27 | /* Shutdown handler. Signal completion of shutdown by loading special PSW. */ |
| 8b94c1ed | 28 | static void do_machine_quiesce(void) |
| 1da177e4 LT |
29 | { |
| 30 | psw_t quiesce_psw; | |
| 31 | ||
| c6b5b847 | 32 | smp_send_stop(); |
| 1da177e4 LT |
33 | quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
| 34 | quiesce_psw.addr = 0xfff; | |
| 35 | __load_psw(quiesce_psw); | |
| 36 | } | |
| 1da177e4 | 37 | |
| 1da177e4 | 38 | /* Handler for quiesce event. Start shutdown procedure. */ |
| 8b94c1ed | 39 | static void sclp_quiesce_handler(struct evbuf_header *evbuf) |
| 1da177e4 | 40 | { |
| 8b94c1ed MS |
41 | if (_machine_restart != (void *) do_machine_quiesce) { |
| 42 | old_machine_restart = _machine_restart; | |
| 43 | old_machine_halt = _machine_halt; | |
| 44 | old_machine_power_off = _machine_power_off; | |
| 45 | _machine_restart = (void *) do_machine_quiesce; | |
| 46 | _machine_halt = do_machine_quiesce; | |
| 47 | _machine_power_off = do_machine_quiesce; | |
| 48 | } | |
| 1da177e4 LT |
49 | ctrl_alt_del(); |
| 50 | } | |
| 51 | ||
| 8b94c1ed MS |
52 | /* Undo machine restart/halt/power_off modification on resume */ |
| 53 | static void sclp_quiesce_pm_event(struct sclp_register *reg, | |
| 54 | enum sclp_pm_event sclp_pm_event) | |
| 55 | { | |
| 56 | switch (sclp_pm_event) { | |
| 57 | case SCLP_PM_EVENT_RESTORE: | |
| 58 | if (old_machine_restart) { | |
| 59 | _machine_restart = old_machine_restart; | |
| 60 | _machine_halt = old_machine_halt; | |
| 61 | _machine_power_off = old_machine_power_off; | |
| 62 | old_machine_restart = NULL; | |
| 63 | old_machine_halt = NULL; | |
| 64 | old_machine_power_off = NULL; | |
| 65 | } | |
| 66 | break; | |
| 67 | case SCLP_PM_EVENT_FREEZE: | |
| 68 | case SCLP_PM_EVENT_THAW: | |
| 69 | break; | |
| 70 | } | |
| 71 | } | |
| 72 | ||
| 1da177e4 | 73 | static struct sclp_register sclp_quiesce_event = { |
| 6d4740c8 | 74 | .receive_mask = EVTYP_SIGQUIESCE_MASK, |
| 8b94c1ed MS |
75 | .receiver_fn = sclp_quiesce_handler, |
| 76 | .pm_event_fn = sclp_quiesce_pm_event | |
| 1da177e4 LT |
77 | }; |
| 78 | ||
| 79 | /* Initialize quiesce driver. */ | |
| 8b94c1ed | 80 | static int __init sclp_quiesce_init(void) |
| 1da177e4 | 81 | { |
| a12c53f4 | 82 | return sclp_register(&sclp_quiesce_event); |
| 1da177e4 LT |
83 | } |
| 84 | ||
| 85 | module_init(sclp_quiesce_init); |