Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * drivers/s390/sysinfo.c
3 *
4 * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s): Ulrich Weigand (Ulrich.Weigand@de.ibm.com)
6 */
7
8#include <linux/kernel.h>
9#include <linux/mm.h>
10#include <linux/proc_fs.h>
11#include <linux/init.h>
12#include <linux/delay.h>
13#include <asm/ebcdic.h>
14#include <asm/sysinfo.h>
15
16/* Sigh, math-emu. Don't ask. */
17#include <asm/sfp-util.h>
18#include <math-emu/soft-fp.h>
19#include <math-emu/single.h>
20
21static inline int stsi_0(void)
22{
23 int rc = stsi (NULL, 0, 0, 0);
24 return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
25}
26
27static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
28{
29 if (stsi(info, 1, 1, 1) == -ENOSYS)
30 return len;
31
32 EBCASC(info->manufacturer, sizeof(info->manufacturer));
33 EBCASC(info->type, sizeof(info->type));
34 EBCASC(info->model, sizeof(info->model));
35 EBCASC(info->sequence, sizeof(info->sequence));
36 EBCASC(info->plant, sizeof(info->plant));
37 EBCASC(info->model_capacity, sizeof(info->model_capacity));
38 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
39 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
40 len += sprintf(page + len, "Manufacturer: %-16.16s\n",
41 info->manufacturer);
42 len += sprintf(page + len, "Type: %-4.4s\n",
43 info->type);
44 if (info->model[0] != '\0')
45 /*
46 * Sigh: the model field has been renamed with System z9
47 * to model_capacity and a new model field has been added
48 * after the plant field. To avoid confusing older programs
49 * the "Model:" prints "model_capacity model" or just
50 * "model_capacity" if the model string is empty .
51 */
52 len += sprintf(page + len,
53 "Model: %-16.16s %-16.16s\n",
54 info->model_capacity, info->model);
55 else
56 len += sprintf(page + len, "Model: %-16.16s\n",
57 info->model_capacity);
58 len += sprintf(page + len, "Sequence Code: %-16.16s\n",
59 info->sequence);
60 len += sprintf(page + len, "Plant: %-4.4s\n",
61 info->plant);
62 len += sprintf(page + len, "Model Capacity: %-16.16s %08u\n",
63 info->model_capacity, *(u32 *) info->model_cap_rating);
64 if (info->model_perm_cap[0] != '\0')
65 len += sprintf(page + len,
66 "Model Perm. Capacity: %-16.16s %08u\n",
67 info->model_perm_cap,
68 *(u32 *) info->model_perm_cap_rating);
69 if (info->model_temp_cap[0] != '\0')
70 len += sprintf(page + len,
71 "Model Temp. Capacity: %-16.16s %08u\n",
72 info->model_temp_cap,
73 *(u32 *) info->model_temp_cap_rating);
74 return len;
75}
76
77#if 0 /* Currently unused */
78static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
79{
80 if (stsi(info, 1, 2, 1) == -ENOSYS)
81 return len;
82
83 len += sprintf(page + len, "\n");
84 EBCASC(info->sequence, sizeof(info->sequence));
85 EBCASC(info->plant, sizeof(info->plant));
86 len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
87 info->sequence);
88 len += sprintf(page + len, "Plant of CPU: %-16.16s\n",
89 info->plant);
90 return len;
91}
92#endif
93
94static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
95{
96 struct sysinfo_1_2_2_extension *ext;
97 int i;
98
99 if (stsi(info, 1, 2, 2) == -ENOSYS)
100 return len;
101 ext = (struct sysinfo_1_2_2_extension *)
102 ((unsigned long) info + info->acc_offset);
103
104 len += sprintf(page + len, "\n");
105 len += sprintf(page + len, "CPUs Total: %d\n",
106 info->cpus_total);
107 len += sprintf(page + len, "CPUs Configured: %d\n",
108 info->cpus_configured);
109 len += sprintf(page + len, "CPUs Standby: %d\n",
110 info->cpus_standby);
111 len += sprintf(page + len, "CPUs Reserved: %d\n",
112 info->cpus_reserved);
113
114 if (info->format == 1) {
115 /*
116 * Sigh 2. According to the specification the alternate
117 * capability field is a 32 bit floating point number
118 * if the higher order 8 bits are not zero. Printing
119 * a floating point number in the kernel is a no-no,
120 * always print the number as 32 bit unsigned integer.
121 * The user-space needs to know about the strange
122 * encoding of the alternate cpu capability.
123 */
124 len += sprintf(page + len, "Capability: %u %u\n",
125 info->capability, ext->alt_capability);
126 for (i = 2; i <= info->cpus_total; i++)
127 len += sprintf(page + len,
128 "Adjustment %02d-way: %u %u\n",
129 i, info->adjustment[i-2],
130 ext->alt_adjustment[i-2]);
131
132 } else {
133 len += sprintf(page + len, "Capability: %u\n",
134 info->capability);
135 for (i = 2; i <= info->cpus_total; i++)
136 len += sprintf(page + len,
137 "Adjustment %02d-way: %u\n",
138 i, info->adjustment[i-2]);
139 }
140
141 if (info->secondary_capability != 0)
142 len += sprintf(page + len, "Secondary Capability: %d\n",
143 info->secondary_capability);
144
145 return len;
146}
147
148#if 0 /* Currently unused */
149static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
150{
151 if (stsi(info, 2, 2, 1) == -ENOSYS)
152 return len;
153
154 len += sprintf(page + len, "\n");
155 EBCASC (info->sequence, sizeof(info->sequence));
156 EBCASC (info->plant, sizeof(info->plant));
157 len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
158 info->sequence);
159 len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
160 info->plant);
161 return len;
162}
163#endif
164
165static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
166{
167 if (stsi(info, 2, 2, 2) == -ENOSYS)
168 return len;
169
170 EBCASC (info->name, sizeof(info->name));
171
172 len += sprintf(page + len, "\n");
173 len += sprintf(page + len, "LPAR Number: %d\n",
174 info->lpar_number);
175
176 len += sprintf(page + len, "LPAR Characteristics: ");
177 if (info->characteristics & LPAR_CHAR_DEDICATED)
178 len += sprintf(page + len, "Dedicated ");
179 if (info->characteristics & LPAR_CHAR_SHARED)
180 len += sprintf(page + len, "Shared ");
181 if (info->characteristics & LPAR_CHAR_LIMITED)
182 len += sprintf(page + len, "Limited ");
183 len += sprintf(page + len, "\n");
184
185 len += sprintf(page + len, "LPAR Name: %-8.8s\n",
186 info->name);
187
188 len += sprintf(page + len, "LPAR Adjustment: %d\n",
189 info->caf);
190
191 len += sprintf(page + len, "LPAR CPUs Total: %d\n",
192 info->cpus_total);
193 len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
194 info->cpus_configured);
195 len += sprintf(page + len, "LPAR CPUs Standby: %d\n",
196 info->cpus_standby);
197 len += sprintf(page + len, "LPAR CPUs Reserved: %d\n",
198 info->cpus_reserved);
199 len += sprintf(page + len, "LPAR CPUs Dedicated: %d\n",
200 info->cpus_dedicated);
201 len += sprintf(page + len, "LPAR CPUs Shared: %d\n",
202 info->cpus_shared);
203 return len;
204}
205
206static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
207{
208 int i;
209
210 if (stsi(info, 3, 2, 2) == -ENOSYS)
211 return len;
212 for (i = 0; i < info->count; i++) {
213 EBCASC (info->vm[i].name, sizeof(info->vm[i].name));
214 EBCASC (info->vm[i].cpi, sizeof(info->vm[i].cpi));
215 len += sprintf(page + len, "\n");
216 len += sprintf(page + len, "VM%02d Name: %-8.8s\n",
217 i, info->vm[i].name);
218 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
219 i, info->vm[i].cpi);
220
221 len += sprintf(page + len, "VM%02d Adjustment: %d\n",
222 i, info->vm[i].caf);
223
224 len += sprintf(page + len, "VM%02d CPUs Total: %d\n",
225 i, info->vm[i].cpus_total);
226 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
227 i, info->vm[i].cpus_configured);
228 len += sprintf(page + len, "VM%02d CPUs Standby: %d\n",
229 i, info->vm[i].cpus_standby);
230 len += sprintf(page + len, "VM%02d CPUs Reserved: %d\n",
231 i, info->vm[i].cpus_reserved);
232 }
233 return len;
234}
235
236
237static int proc_read_sysinfo(char *page, char **start,
238 off_t off, int count,
239 int *eof, void *data)
240{
241 unsigned long info = get_zeroed_page (GFP_KERNEL);
242 int level, len;
243
244 if (!info)
245 return 0;
246
247 len = 0;
248 level = stsi_0();
249 if (level >= 1)
250 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
251
252 if (level >= 1)
253 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
254
255 if (level >= 2)
256 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
257
258 if (level >= 3)
259 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
260
261 free_page (info);
262 return len;
263}
264
265static __init int create_proc_sysinfo(void)
266{
267 create_proc_read_entry("sysinfo", 0444, NULL,
268 proc_read_sysinfo, NULL);
269 return 0;
270}
271
272__initcall(create_proc_sysinfo);
273
274int get_cpu_capability(unsigned int *capability)
275{
276 struct sysinfo_1_2_2 *info;
277 int rc;
278
279 info = (void *) get_zeroed_page(GFP_KERNEL);
280 if (!info)
281 return -ENOMEM;
282 rc = stsi(info, 1, 2, 2);
283 if (rc == -ENOSYS)
284 goto out;
285 rc = 0;
286 *capability = info->capability;
287out:
288 free_page((unsigned long) info);
289 return rc;
290}
291
292/*
293 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
294 */
295void s390_adjust_jiffies(void)
296{
297 struct sysinfo_1_2_2 *info;
298 const unsigned int fmil = 0x4b189680; /* 1e7 as 32-bit float. */
299 FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
300 FP_DECL_EX;
301 unsigned int capability;
302
303 info = (void *) get_zeroed_page(GFP_KERNEL);
304 if (!info)
305 return;
306
307 if (stsi(info, 1, 2, 2) != -ENOSYS) {
308 /*
309 * Major sigh. The cpu capability encoding is "special".
310 * If the first 9 bits of info->capability are 0 then it
311 * is a 32 bit unsigned integer in the range 0 .. 2^23.
312 * If the first 9 bits are != 0 then it is a 32 bit float.
313 * In addition a lower value indicates a proportionally
314 * higher cpu capacity. Bogomips are the other way round.
315 * To get to a halfway suitable number we divide 1e7
316 * by the cpu capability number. Yes, that means a floating
317 * point division .. math-emu here we come :-)
318 */
319 FP_UNPACK_SP(SA, &fmil);
320 if ((info->capability >> 23) == 0)
321 FP_FROM_INT_S(SB, info->capability, 32, int);
322 else
323 FP_UNPACK_SP(SB, &info->capability);
324 FP_DIV_S(SR, SA, SB);
325 FP_TO_INT_S(capability, SR, 32, 0);
326 } else
327 /*
328 * Really old machine without stsi block for basic
329 * cpu information. Report 42.0 bogomips.
330 */
331 capability = 42;
332 loops_per_jiffy = capability * (500000/HZ);
333 free_page((unsigned long) info);
334}
335
336/*
337 * calibrate the delay loop
338 */
339void __cpuinit calibrate_delay(void)
340{
341 s390_adjust_jiffies();
342 /* Print the good old Bogomips line .. */
343 printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
344 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
345 (loops_per_jiffy/(5000/HZ)) % 100);
346}