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3ab121ab MH |
1 | /* |
2 | * Linux Guest Relocation (LGR) detection | |
3 | * | |
4 | * Copyright IBM Corp. 2012 | |
5 | * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com> | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/timer.h> | |
10 | #include <linux/slab.h> | |
1e3cab2f | 11 | #include <asm/facility.h> |
3ab121ab MH |
12 | #include <asm/sysinfo.h> |
13 | #include <asm/ebcdic.h> | |
3ab121ab MH |
14 | #include <asm/debug.h> |
15 | #include <asm/ipl.h> | |
16 | ||
17 | #define LGR_TIMER_INTERVAL_SECS (30 * 60) | |
18 | #define VM_LEVEL_MAX 2 /* Maximum is 8, but we only record two levels */ | |
19 | ||
20 | /* | |
21 | * LGR info: Contains stfle and stsi data | |
22 | */ | |
23 | struct lgr_info { | |
24 | /* Bit field with facility information: 4 DWORDs are stored */ | |
25 | u64 stfle_fac_list[4]; | |
26 | /* Level of system (1 = CEC, 2 = LPAR, 3 = z/VM */ | |
27 | u32 level; | |
28 | /* Level 1: CEC info (stsi 1.1.1) */ | |
29 | char manufacturer[16]; | |
30 | char type[4]; | |
31 | char sequence[16]; | |
32 | char plant[4]; | |
33 | char model[16]; | |
34 | /* Level 2: LPAR info (stsi 2.2.2) */ | |
35 | u16 lpar_number; | |
36 | char name[8]; | |
37 | /* Level 3: VM info (stsi 3.2.2) */ | |
38 | u8 vm_count; | |
39 | struct { | |
40 | char name[8]; | |
41 | char cpi[16]; | |
42 | } vm[VM_LEVEL_MAX]; | |
43 | } __packed __aligned(8); | |
44 | ||
45 | /* | |
46 | * LGR globals | |
47 | */ | |
48 | static void *lgr_page; | |
49 | static struct lgr_info lgr_info_last; | |
50 | static struct lgr_info lgr_info_cur; | |
51 | static struct debug_info *lgr_dbf; | |
52 | ||
53 | /* | |
54 | * Return number of valid stsi levels | |
55 | */ | |
56 | static inline int stsi_0(void) | |
57 | { | |
58 | int rc = stsi(NULL, 0, 0, 0); | |
59 | ||
60 | return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28); | |
61 | } | |
62 | ||
63 | /* | |
64 | * Copy buffer and then convert it to ASCII | |
65 | */ | |
66 | static void cpascii(char *dst, char *src, int size) | |
67 | { | |
68 | memcpy(dst, src, size); | |
69 | EBCASC(dst, size); | |
70 | } | |
71 | ||
72 | /* | |
73 | * Fill LGR info with 1.1.1 stsi data | |
74 | */ | |
75 | static void lgr_stsi_1_1_1(struct lgr_info *lgr_info) | |
76 | { | |
77 | struct sysinfo_1_1_1 *si = lgr_page; | |
78 | ||
79 | if (stsi(si, 1, 1, 1) == -ENOSYS) | |
80 | return; | |
81 | cpascii(lgr_info->manufacturer, si->manufacturer, | |
82 | sizeof(si->manufacturer)); | |
83 | cpascii(lgr_info->type, si->type, sizeof(si->type)); | |
84 | cpascii(lgr_info->model, si->model, sizeof(si->model)); | |
85 | cpascii(lgr_info->sequence, si->sequence, sizeof(si->sequence)); | |
86 | cpascii(lgr_info->plant, si->plant, sizeof(si->plant)); | |
87 | } | |
88 | ||
89 | /* | |
90 | * Fill LGR info with 2.2.2 stsi data | |
91 | */ | |
92 | static void lgr_stsi_2_2_2(struct lgr_info *lgr_info) | |
93 | { | |
94 | struct sysinfo_2_2_2 *si = lgr_page; | |
95 | ||
96 | if (stsi(si, 2, 2, 2) == -ENOSYS) | |
97 | return; | |
98 | cpascii(lgr_info->name, si->name, sizeof(si->name)); | |
99 | memcpy(&lgr_info->lpar_number, &si->lpar_number, | |
100 | sizeof(lgr_info->lpar_number)); | |
101 | } | |
102 | ||
103 | /* | |
104 | * Fill LGR info with 3.2.2 stsi data | |
105 | */ | |
106 | static void lgr_stsi_3_2_2(struct lgr_info *lgr_info) | |
107 | { | |
108 | struct sysinfo_3_2_2 *si = lgr_page; | |
109 | int i; | |
110 | ||
111 | if (stsi(si, 3, 2, 2) == -ENOSYS) | |
112 | return; | |
113 | for (i = 0; i < min_t(u8, si->count, VM_LEVEL_MAX); i++) { | |
114 | cpascii(lgr_info->vm[i].name, si->vm[i].name, | |
115 | sizeof(si->vm[i].name)); | |
116 | cpascii(lgr_info->vm[i].cpi, si->vm[i].cpi, | |
117 | sizeof(si->vm[i].cpi)); | |
118 | } | |
119 | lgr_info->vm_count = si->count; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Fill LGR info with current data | |
124 | */ | |
125 | static void lgr_info_get(struct lgr_info *lgr_info) | |
126 | { | |
127 | memset(lgr_info, 0, sizeof(*lgr_info)); | |
128 | stfle(lgr_info->stfle_fac_list, ARRAY_SIZE(lgr_info->stfle_fac_list)); | |
129 | lgr_info->level = stsi_0(); | |
130 | if (lgr_info->level == -ENOSYS) | |
131 | return; | |
132 | if (lgr_info->level >= 1) | |
133 | lgr_stsi_1_1_1(lgr_info); | |
134 | if (lgr_info->level >= 2) | |
135 | lgr_stsi_2_2_2(lgr_info); | |
136 | if (lgr_info->level >= 3) | |
137 | lgr_stsi_3_2_2(lgr_info); | |
138 | } | |
139 | ||
140 | /* | |
141 | * Check if LGR info has changed and if yes log new LGR info to s390dbf | |
142 | */ | |
143 | void lgr_info_log(void) | |
144 | { | |
145 | static DEFINE_SPINLOCK(lgr_info_lock); | |
146 | unsigned long flags; | |
147 | ||
148 | if (!spin_trylock_irqsave(&lgr_info_lock, flags)) | |
149 | return; | |
150 | lgr_info_get(&lgr_info_cur); | |
151 | if (memcmp(&lgr_info_last, &lgr_info_cur, sizeof(lgr_info_cur)) != 0) { | |
152 | debug_event(lgr_dbf, 1, &lgr_info_cur, sizeof(lgr_info_cur)); | |
153 | lgr_info_last = lgr_info_cur; | |
154 | } | |
155 | spin_unlock_irqrestore(&lgr_info_lock, flags); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(lgr_info_log); | |
158 | ||
159 | static void lgr_timer_set(void); | |
160 | ||
161 | /* | |
162 | * LGR timer callback | |
163 | */ | |
164 | static void lgr_timer_fn(unsigned long ignored) | |
165 | { | |
166 | lgr_info_log(); | |
167 | lgr_timer_set(); | |
168 | } | |
169 | ||
170 | static struct timer_list lgr_timer = | |
171 | TIMER_DEFERRED_INITIALIZER(lgr_timer_fn, 0, 0); | |
172 | ||
173 | /* | |
174 | * Setup next LGR timer | |
175 | */ | |
176 | static void lgr_timer_set(void) | |
177 | { | |
178 | mod_timer(&lgr_timer, jiffies + LGR_TIMER_INTERVAL_SECS * HZ); | |
179 | } | |
180 | ||
181 | /* | |
182 | * Initialize LGR: Add s390dbf, write initial lgr_info and setup timer | |
183 | */ | |
184 | static int __init lgr_init(void) | |
185 | { | |
186 | lgr_page = (void *) __get_free_pages(GFP_KERNEL, 0); | |
187 | if (!lgr_page) | |
188 | return -ENOMEM; | |
189 | lgr_dbf = debug_register("lgr", 1, 1, sizeof(struct lgr_info)); | |
190 | if (!lgr_dbf) { | |
191 | free_page((unsigned long) lgr_page); | |
192 | return -ENOMEM; | |
193 | } | |
194 | debug_register_view(lgr_dbf, &debug_hex_ascii_view); | |
195 | lgr_info_get(&lgr_info_last); | |
196 | debug_event(lgr_dbf, 1, &lgr_info_last, sizeof(lgr_info_last)); | |
197 | lgr_timer_set(); | |
198 | return 0; | |
199 | } | |
200 | module_init(lgr_init); |