Commit | Line | Data |
---|---|---|
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 | ||
17 | static int hv_supports_soft_state; | |
18 | ||
19 | static unsigned long kimage_addr_to_ra(const char *p) | |
20 | { | |
21 | unsigned long val = (unsigned long) p; | |
22 | ||
23 | return kern_base + (val - KERNBASE); | |
24 | } | |
25 | ||
26 | static void do_set_sstate(unsigned long state, const char *msg) | |
27 | { | |
28 | unsigned long err; | |
29 | ||
30 | if (!hv_supports_soft_state) | |
31 | return; | |
32 | ||
33 | err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg)); | |
34 | if (err) { | |
35 | printk(KERN_WARNING "SSTATE: Failed to set soft-state to " | |
36 | "state[%lx] msg[%s], err=%lu\n", | |
37 | state, msg, err); | |
38 | } | |
39 | } | |
40 | ||
41 | static const char booting_msg[32] __attribute__((aligned(32))) = | |
42 | "Linux booting"; | |
43 | static const char running_msg[32] __attribute__((aligned(32))) = | |
44 | "Linux running"; | |
45 | static const char halting_msg[32] __attribute__((aligned(32))) = | |
46 | "Linux halting"; | |
47 | static const char poweroff_msg[32] __attribute__((aligned(32))) = | |
48 | "Linux powering off"; | |
49 | static const char rebooting_msg[32] __attribute__((aligned(32))) = | |
50 | "Linux rebooting"; | |
51 | static const char panicing_msg[32] __attribute__((aligned(32))) = | |
52 | "Linux panicing"; | |
53 | ||
446139a8 | 54 | static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused) |
22d6a1cb | 55 | { |
446139a8 | 56 | const char *msg; |
22d6a1cb | 57 | |
446139a8 DM |
58 | switch (type) { |
59 | case SYS_DOWN: | |
60 | default: | |
61 | msg = rebooting_msg; | |
62 | break; | |
22d6a1cb | 63 | |
446139a8 DM |
64 | case SYS_HALT: |
65 | msg = halting_msg; | |
66 | break; | |
22d6a1cb | 67 | |
446139a8 DM |
68 | case SYS_POWER_OFF: |
69 | msg = poweroff_msg; | |
70 | break; | |
71 | } | |
22d6a1cb | 72 | |
446139a8 DM |
73 | do_set_sstate(HV_SOFT_STATE_TRANSITION, msg); |
74 | ||
75 | return NOTIFY_OK; | |
22d6a1cb DM |
76 | } |
77 | ||
446139a8 DM |
78 | static struct notifier_block sstate_reboot_notifier = { |
79 | .notifier_call = sstate_reboot_call, | |
80 | }; | |
81 | ||
22d6a1cb DM |
82 | static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr) |
83 | { | |
84 | do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg); | |
85 | ||
86 | return NOTIFY_DONE; | |
87 | } | |
88 | ||
89 | static struct notifier_block sstate_panic_block = { | |
90 | .notifier_call = sstate_panic_event, | |
91 | .priority = INT_MAX, | |
92 | }; | |
93 | ||
446139a8 | 94 | static int __init sstate_init(void) |
22d6a1cb DM |
95 | { |
96 | unsigned long major, minor; | |
97 | ||
446139a8 DM |
98 | if (tlb_type != hypervisor) |
99 | return 0; | |
100 | ||
22d6a1cb DM |
101 | major = 1; |
102 | minor = 0; | |
103 | if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor)) | |
446139a8 | 104 | return 0; |
22d6a1cb DM |
105 | |
106 | hv_supports_soft_state = 1; | |
107 | ||
108 | prom_sun4v_guest_soft_state(); | |
446139a8 DM |
109 | |
110 | do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg); | |
111 | ||
22d6a1cb DM |
112 | atomic_notifier_chain_register(&panic_notifier_list, |
113 | &sstate_panic_block); | |
446139a8 DM |
114 | register_reboot_notifier(&sstate_reboot_notifier); |
115 | ||
116 | return 0; | |
22d6a1cb | 117 | } |
446139a8 DM |
118 | |
119 | core_initcall(sstate_init); | |
120 | ||
121 | static int __init sstate_running(void) | |
122 | { | |
123 | do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | late_initcall(sstate_running); |