Commit | Line | Data |
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22d6a1cb DM |
1 | /* sstate.c: System soft state support. |
2 | * | |
446139a8 | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
22d6a1cb DM |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/notifier.h> | |
446139a8 | 8 | #include <linux/reboot.h> |
22d6a1cb DM |
9 | #include <linux/init.h> |
10 | ||
11 | #include <asm/hypervisor.h> | |
446139a8 | 12 | #include <asm/spitfire.h> |
22d6a1cb DM |
13 | #include <asm/oplib.h> |
14 | #include <asm/head.h> | |
15 | #include <asm/io.h> | |
16 | ||
ea5e7447 | 17 | #include "kernel.h" |
22d6a1cb | 18 | |
ea5e7447 | 19 | static int hv_supports_soft_state; |
22d6a1cb DM |
20 | |
21 | static void do_set_sstate(unsigned long state, const char *msg) | |
22 | { | |
23 | unsigned long err; | |
24 | ||
25 | if (!hv_supports_soft_state) | |
26 | return; | |
27 | ||
28 | err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg)); | |
29 | if (err) { | |
30 | printk(KERN_WARNING "SSTATE: Failed to set soft-state to " | |
31 | "state[%lx] msg[%s], err=%lu\n", | |
32 | state, msg, err); | |
33 | } | |
34 | } | |
35 | ||
36 | static const char booting_msg[32] __attribute__((aligned(32))) = | |
37 | "Linux booting"; | |
38 | static const char running_msg[32] __attribute__((aligned(32))) = | |
39 | "Linux running"; | |
40 | static const char halting_msg[32] __attribute__((aligned(32))) = | |
41 | "Linux halting"; | |
42 | static const char poweroff_msg[32] __attribute__((aligned(32))) = | |
43 | "Linux powering off"; | |
44 | static const char rebooting_msg[32] __attribute__((aligned(32))) = | |
45 | "Linux rebooting"; | |
46 | static const char panicing_msg[32] __attribute__((aligned(32))) = | |
47 | "Linux panicing"; | |
48 | ||
446139a8 | 49 | static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused) |
22d6a1cb | 50 | { |
446139a8 | 51 | const char *msg; |
22d6a1cb | 52 | |
446139a8 DM |
53 | switch (type) { |
54 | case SYS_DOWN: | |
55 | default: | |
56 | msg = rebooting_msg; | |
57 | break; | |
22d6a1cb | 58 | |
446139a8 DM |
59 | case SYS_HALT: |
60 | msg = halting_msg; | |
61 | break; | |
22d6a1cb | 62 | |
446139a8 DM |
63 | case SYS_POWER_OFF: |
64 | msg = poweroff_msg; | |
65 | break; | |
66 | } | |
22d6a1cb | 67 | |
446139a8 DM |
68 | do_set_sstate(HV_SOFT_STATE_TRANSITION, msg); |
69 | ||
70 | return NOTIFY_OK; | |
22d6a1cb DM |
71 | } |
72 | ||
446139a8 DM |
73 | static struct notifier_block sstate_reboot_notifier = { |
74 | .notifier_call = sstate_reboot_call, | |
75 | }; | |
76 | ||
22d6a1cb DM |
77 | static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr) |
78 | { | |
79 | do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg); | |
80 | ||
81 | return NOTIFY_DONE; | |
82 | } | |
83 | ||
84 | static struct notifier_block sstate_panic_block = { | |
85 | .notifier_call = sstate_panic_event, | |
86 | .priority = INT_MAX, | |
87 | }; | |
88 | ||
446139a8 | 89 | static int __init sstate_init(void) |
22d6a1cb DM |
90 | { |
91 | unsigned long major, minor; | |
92 | ||
446139a8 DM |
93 | if (tlb_type != hypervisor) |
94 | return 0; | |
95 | ||
22d6a1cb DM |
96 | major = 1; |
97 | minor = 0; | |
98 | if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor)) | |
446139a8 | 99 | return 0; |
22d6a1cb DM |
100 | |
101 | hv_supports_soft_state = 1; | |
102 | ||
103 | prom_sun4v_guest_soft_state(); | |
446139a8 DM |
104 | |
105 | do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg); | |
106 | ||
22d6a1cb DM |
107 | atomic_notifier_chain_register(&panic_notifier_list, |
108 | &sstate_panic_block); | |
446139a8 DM |
109 | register_reboot_notifier(&sstate_reboot_notifier); |
110 | ||
111 | return 0; | |
22d6a1cb | 112 | } |
446139a8 DM |
113 | |
114 | core_initcall(sstate_init); | |
115 | ||
116 | static int __init sstate_running(void) | |
117 | { | |
118 | do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | late_initcall(sstate_running); |