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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
22d6a1cb DM |
2 | /* sstate.c: System soft state support. |
3 | * | |
446139a8 | 4 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
22d6a1cb DM |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/notifier.h> | |
f39650de | 9 | #include <linux/panic_notifier.h> |
446139a8 | 10 | #include <linux/reboot.h> |
22d6a1cb DM |
11 | #include <linux/init.h> |
12 | ||
13 | #include <asm/hypervisor.h> | |
446139a8 | 14 | #include <asm/spitfire.h> |
22d6a1cb DM |
15 | #include <asm/oplib.h> |
16 | #include <asm/head.h> | |
17 | #include <asm/io.h> | |
18 | ||
ea5e7447 | 19 | #include "kernel.h" |
22d6a1cb | 20 | |
ea5e7447 | 21 | static int hv_supports_soft_state; |
22d6a1cb DM |
22 | |
23 | static void do_set_sstate(unsigned long state, const char *msg) | |
24 | { | |
25 | unsigned long err; | |
26 | ||
27 | if (!hv_supports_soft_state) | |
28 | return; | |
29 | ||
30 | err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg)); | |
31 | if (err) { | |
32 | printk(KERN_WARNING "SSTATE: Failed to set soft-state to " | |
33 | "state[%lx] msg[%s], err=%lu\n", | |
34 | state, msg, err); | |
35 | } | |
36 | } | |
37 | ||
38 | static const char booting_msg[32] __attribute__((aligned(32))) = | |
39 | "Linux booting"; | |
40 | static const char running_msg[32] __attribute__((aligned(32))) = | |
41 | "Linux running"; | |
42 | static const char halting_msg[32] __attribute__((aligned(32))) = | |
43 | "Linux halting"; | |
44 | static const char poweroff_msg[32] __attribute__((aligned(32))) = | |
45 | "Linux powering off"; | |
46 | static const char rebooting_msg[32] __attribute__((aligned(32))) = | |
47 | "Linux rebooting"; | |
5d0e7705 TH |
48 | static const char panicking_msg[32] __attribute__((aligned(32))) = |
49 | "Linux panicking"; | |
22d6a1cb | 50 | |
446139a8 | 51 | static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused) |
22d6a1cb | 52 | { |
446139a8 | 53 | const char *msg; |
22d6a1cb | 54 | |
446139a8 DM |
55 | switch (type) { |
56 | case SYS_DOWN: | |
57 | default: | |
58 | msg = rebooting_msg; | |
59 | break; | |
22d6a1cb | 60 | |
446139a8 DM |
61 | case SYS_HALT: |
62 | msg = halting_msg; | |
63 | break; | |
22d6a1cb | 64 | |
446139a8 DM |
65 | case SYS_POWER_OFF: |
66 | msg = poweroff_msg; | |
67 | break; | |
68 | } | |
22d6a1cb | 69 | |
446139a8 DM |
70 | do_set_sstate(HV_SOFT_STATE_TRANSITION, msg); |
71 | ||
72 | return NOTIFY_OK; | |
22d6a1cb DM |
73 | } |
74 | ||
446139a8 DM |
75 | static struct notifier_block sstate_reboot_notifier = { |
76 | .notifier_call = sstate_reboot_call, | |
77 | }; | |
78 | ||
22d6a1cb DM |
79 | static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr) |
80 | { | |
5d0e7705 | 81 | do_set_sstate(HV_SOFT_STATE_TRANSITION, panicking_msg); |
22d6a1cb DM |
82 | |
83 | return NOTIFY_DONE; | |
84 | } | |
85 | ||
86 | static struct notifier_block sstate_panic_block = { | |
87 | .notifier_call = sstate_panic_event, | |
88 | .priority = INT_MAX, | |
89 | }; | |
90 | ||
446139a8 | 91 | static int __init sstate_init(void) |
22d6a1cb DM |
92 | { |
93 | unsigned long major, minor; | |
94 | ||
446139a8 DM |
95 | if (tlb_type != hypervisor) |
96 | return 0; | |
97 | ||
22d6a1cb DM |
98 | major = 1; |
99 | minor = 0; | |
100 | if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor)) | |
446139a8 | 101 | return 0; |
22d6a1cb DM |
102 | |
103 | hv_supports_soft_state = 1; | |
104 | ||
105 | prom_sun4v_guest_soft_state(); | |
446139a8 DM |
106 | |
107 | do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg); | |
108 | ||
22d6a1cb DM |
109 | atomic_notifier_chain_register(&panic_notifier_list, |
110 | &sstate_panic_block); | |
446139a8 DM |
111 | register_reboot_notifier(&sstate_reboot_notifier); |
112 | ||
113 | return 0; | |
22d6a1cb | 114 | } |
446139a8 DM |
115 | |
116 | core_initcall(sstate_init); | |
117 | ||
118 | static int __init sstate_running(void) | |
119 | { | |
120 | do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | late_initcall(sstate_running); |