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a17ae4c3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3ab121ab MH |
2 | /* |
3 | * Linux Guest Relocation (LGR) detection | |
4 | * | |
5 | * Copyright IBM Corp. 2012 | |
6 | * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com> | |
7 | */ | |
8 | ||
8ba8b05f PG |
9 | #include <linux/init.h> |
10 | #include <linux/export.h> | |
3ab121ab MH |
11 | #include <linux/timer.h> |
12 | #include <linux/slab.h> | |
1e3cab2f | 13 | #include <asm/facility.h> |
3ab121ab MH |
14 | #include <asm/sysinfo.h> |
15 | #include <asm/ebcdic.h> | |
3ab121ab MH |
16 | #include <asm/debug.h> |
17 | #include <asm/ipl.h> | |
18 | ||
19 | #define LGR_TIMER_INTERVAL_SECS (30 * 60) | |
20 | #define VM_LEVEL_MAX 2 /* Maximum is 8, but we only record two levels */ | |
21 | ||
22 | /* | |
23 | * LGR info: Contains stfle and stsi data | |
24 | */ | |
25 | struct lgr_info { | |
26 | /* Bit field with facility information: 4 DWORDs are stored */ | |
27 | u64 stfle_fac_list[4]; | |
28 | /* Level of system (1 = CEC, 2 = LPAR, 3 = z/VM */ | |
29 | u32 level; | |
30 | /* Level 1: CEC info (stsi 1.1.1) */ | |
31 | char manufacturer[16]; | |
32 | char type[4]; | |
33 | char sequence[16]; | |
34 | char plant[4]; | |
35 | char model[16]; | |
36 | /* Level 2: LPAR info (stsi 2.2.2) */ | |
37 | u16 lpar_number; | |
38 | char name[8]; | |
39 | /* Level 3: VM info (stsi 3.2.2) */ | |
40 | u8 vm_count; | |
41 | struct { | |
42 | char name[8]; | |
43 | char cpi[16]; | |
44 | } vm[VM_LEVEL_MAX]; | |
45 | } __packed __aligned(8); | |
46 | ||
47 | /* | |
48 | * LGR globals | |
49 | */ | |
2b754757 | 50 | static char lgr_page[PAGE_SIZE] __aligned(PAGE_SIZE); |
3ab121ab MH |
51 | static struct lgr_info lgr_info_last; |
52 | static struct lgr_info lgr_info_cur; | |
53 | static struct debug_info *lgr_dbf; | |
54 | ||
3ab121ab MH |
55 | /* |
56 | * Copy buffer and then convert it to ASCII | |
57 | */ | |
58 | static void cpascii(char *dst, char *src, int size) | |
59 | { | |
60 | memcpy(dst, src, size); | |
61 | EBCASC(dst, size); | |
62 | } | |
63 | ||
64 | /* | |
65 | * Fill LGR info with 1.1.1 stsi data | |
66 | */ | |
67 | static void lgr_stsi_1_1_1(struct lgr_info *lgr_info) | |
68 | { | |
2b754757 | 69 | struct sysinfo_1_1_1 *si = (void *) lgr_page; |
3ab121ab | 70 | |
caf757c6 | 71 | if (stsi(si, 1, 1, 1)) |
3ab121ab MH |
72 | return; |
73 | cpascii(lgr_info->manufacturer, si->manufacturer, | |
74 | sizeof(si->manufacturer)); | |
75 | cpascii(lgr_info->type, si->type, sizeof(si->type)); | |
76 | cpascii(lgr_info->model, si->model, sizeof(si->model)); | |
77 | cpascii(lgr_info->sequence, si->sequence, sizeof(si->sequence)); | |
78 | cpascii(lgr_info->plant, si->plant, sizeof(si->plant)); | |
79 | } | |
80 | ||
81 | /* | |
82 | * Fill LGR info with 2.2.2 stsi data | |
83 | */ | |
84 | static void lgr_stsi_2_2_2(struct lgr_info *lgr_info) | |
85 | { | |
2b754757 | 86 | struct sysinfo_2_2_2 *si = (void *) lgr_page; |
3ab121ab | 87 | |
caf757c6 | 88 | if (stsi(si, 2, 2, 2)) |
3ab121ab MH |
89 | return; |
90 | cpascii(lgr_info->name, si->name, sizeof(si->name)); | |
91 | memcpy(&lgr_info->lpar_number, &si->lpar_number, | |
92 | sizeof(lgr_info->lpar_number)); | |
93 | } | |
94 | ||
95 | /* | |
96 | * Fill LGR info with 3.2.2 stsi data | |
97 | */ | |
98 | static void lgr_stsi_3_2_2(struct lgr_info *lgr_info) | |
99 | { | |
2b754757 | 100 | struct sysinfo_3_2_2 *si = (void *) lgr_page; |
3ab121ab MH |
101 | int i; |
102 | ||
caf757c6 | 103 | if (stsi(si, 3, 2, 2)) |
3ab121ab MH |
104 | return; |
105 | for (i = 0; i < min_t(u8, si->count, VM_LEVEL_MAX); i++) { | |
106 | cpascii(lgr_info->vm[i].name, si->vm[i].name, | |
107 | sizeof(si->vm[i].name)); | |
108 | cpascii(lgr_info->vm[i].cpi, si->vm[i].cpi, | |
109 | sizeof(si->vm[i].cpi)); | |
110 | } | |
111 | lgr_info->vm_count = si->count; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Fill LGR info with current data | |
116 | */ | |
117 | static void lgr_info_get(struct lgr_info *lgr_info) | |
118 | { | |
caf757c6 HC |
119 | int level; |
120 | ||
3ab121ab MH |
121 | memset(lgr_info, 0, sizeof(*lgr_info)); |
122 | stfle(lgr_info->stfle_fac_list, ARRAY_SIZE(lgr_info->stfle_fac_list)); | |
caf757c6 HC |
123 | level = stsi(NULL, 0, 0, 0); |
124 | lgr_info->level = level; | |
125 | if (level >= 1) | |
3ab121ab | 126 | lgr_stsi_1_1_1(lgr_info); |
caf757c6 | 127 | if (level >= 2) |
3ab121ab | 128 | lgr_stsi_2_2_2(lgr_info); |
caf757c6 | 129 | if (level >= 3) |
3ab121ab MH |
130 | lgr_stsi_3_2_2(lgr_info); |
131 | } | |
132 | ||
133 | /* | |
134 | * Check if LGR info has changed and if yes log new LGR info to s390dbf | |
135 | */ | |
136 | void lgr_info_log(void) | |
137 | { | |
138 | static DEFINE_SPINLOCK(lgr_info_lock); | |
139 | unsigned long flags; | |
140 | ||
141 | if (!spin_trylock_irqsave(&lgr_info_lock, flags)) | |
142 | return; | |
143 | lgr_info_get(&lgr_info_cur); | |
144 | if (memcmp(&lgr_info_last, &lgr_info_cur, sizeof(lgr_info_cur)) != 0) { | |
145 | debug_event(lgr_dbf, 1, &lgr_info_cur, sizeof(lgr_info_cur)); | |
146 | lgr_info_last = lgr_info_cur; | |
147 | } | |
148 | spin_unlock_irqrestore(&lgr_info_lock, flags); | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(lgr_info_log); | |
151 | ||
152 | static void lgr_timer_set(void); | |
153 | ||
154 | /* | |
155 | * LGR timer callback | |
156 | */ | |
5cd79d6a | 157 | static void lgr_timer_fn(struct timer_list *unused) |
3ab121ab MH |
158 | { |
159 | lgr_info_log(); | |
160 | lgr_timer_set(); | |
161 | } | |
162 | ||
5cd79d6a | 163 | static struct timer_list lgr_timer; |
3ab121ab MH |
164 | |
165 | /* | |
166 | * Setup next LGR timer | |
167 | */ | |
168 | static void lgr_timer_set(void) | |
169 | { | |
0188d08a | 170 | mod_timer(&lgr_timer, jiffies + msecs_to_jiffies(LGR_TIMER_INTERVAL_SECS * MSEC_PER_SEC)); |
3ab121ab MH |
171 | } |
172 | ||
173 | /* | |
174 | * Initialize LGR: Add s390dbf, write initial lgr_info and setup timer | |
175 | */ | |
176 | static int __init lgr_init(void) | |
177 | { | |
3ab121ab | 178 | lgr_dbf = debug_register("lgr", 1, 1, sizeof(struct lgr_info)); |
2b754757 | 179 | if (!lgr_dbf) |
3ab121ab | 180 | return -ENOMEM; |
3ab121ab MH |
181 | debug_register_view(lgr_dbf, &debug_hex_ascii_view); |
182 | lgr_info_get(&lgr_info_last); | |
183 | debug_event(lgr_dbf, 1, &lgr_info_last, sizeof(lgr_info_last)); | |
5cd79d6a | 184 | timer_setup(&lgr_timer, lgr_timer_fn, TIMER_DEFERRABLE); |
3ab121ab MH |
185 | lgr_timer_set(); |
186 | return 0; | |
187 | } | |
8ba8b05f | 188 | device_initcall(lgr_init); |