Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6] / arch / sparc64 / kernel / sstate.c
1 /* sstate.c: System soft state support.
2  *
3  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
4  */
5
6 #include <linux/kernel.h>
7 #include <linux/notifier.h>
8 #include <linux/init.h>
9
10 #include <asm/hypervisor.h>
11 #include <asm/sstate.h>
12 #include <asm/oplib.h>
13 #include <asm/head.h>
14 #include <asm/io.h>
15
16 static int hv_supports_soft_state;
17
18 static unsigned long kimage_addr_to_ra(const char *p)
19 {
20         unsigned long val = (unsigned long) p;
21
22         return kern_base + (val - KERNBASE);
23 }
24
25 static void do_set_sstate(unsigned long state, const char *msg)
26 {
27         unsigned long err;
28
29         if (!hv_supports_soft_state)
30                 return;
31
32         err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg));
33         if (err) {
34                 printk(KERN_WARNING "SSTATE: Failed to set soft-state to "
35                        "state[%lx] msg[%s], err=%lu\n",
36                        state, msg, err);
37         }
38 }
39
40 static const char booting_msg[32] __attribute__((aligned(32))) =
41         "Linux booting";
42 static const char running_msg[32] __attribute__((aligned(32))) =
43         "Linux running";
44 static const char halting_msg[32] __attribute__((aligned(32))) =
45         "Linux halting";
46 static const char poweroff_msg[32] __attribute__((aligned(32))) =
47         "Linux powering off";
48 static const char rebooting_msg[32] __attribute__((aligned(32))) =
49         "Linux rebooting";
50 static const char panicing_msg[32] __attribute__((aligned(32))) =
51         "Linux panicing";
52
53 void sstate_booting(void)
54 {
55         do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
56 }
57
58 void sstate_running(void)
59 {
60         do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
61 }
62
63 void sstate_halt(void)
64 {
65         do_set_sstate(HV_SOFT_STATE_TRANSITION, halting_msg);
66 }
67
68 void sstate_poweroff(void)
69 {
70         do_set_sstate(HV_SOFT_STATE_TRANSITION, poweroff_msg);
71 }
72
73 void sstate_reboot(void)
74 {
75         do_set_sstate(HV_SOFT_STATE_TRANSITION, rebooting_msg);
76 }
77
78 static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr)
79 {
80         do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg);
81
82         return NOTIFY_DONE;
83 }
84
85 static struct notifier_block sstate_panic_block = {
86         .notifier_call  =       sstate_panic_event,
87         .priority       =       INT_MAX,
88 };
89
90 void __init sun4v_sstate_init(void)
91 {
92         unsigned long major, minor;
93
94         major = 1;
95         minor = 0;
96         if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
97                 return;
98
99         hv_supports_soft_state = 1;
100
101         prom_sun4v_guest_soft_state();
102         atomic_notifier_chain_register(&panic_notifier_list,
103                                        &sstate_panic_block);
104 }