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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / arch / s390 / kernel / sysinfo.c
blob2a94b774695c069241ed413f50a0f9b8b183c656
1 /*
2 * Copyright IBM Corp. 2001, 2009
3 * Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
4 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/mm.h>
9 #include <linux/proc_fs.h>
10 #include <linux/seq_file.h>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <asm/ebcdic.h>
16 #include <asm/sysinfo.h>
17 #include <asm/cpcmd.h>
18 #include <asm/topology.h>
19
20 /* Sigh, math-emu. Don't ask. */
21 #include <asm/sfp-util.h>
22 #include <math-emu/soft-fp.h>
23 #include <math-emu/single.h>
24
25 static inline int stsi_0(void)
26 {
27 int rc = stsi(NULL, 0, 0, 0);
28 return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
29 }
30
31 static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
32 {
33 if (stsi(info, 1, 1, 1) == -ENOSYS)
34 return len;
35
36 EBCASC(info->manufacturer, sizeof(info->manufacturer));
37 EBCASC(info->type, sizeof(info->type));
38 EBCASC(info->model, sizeof(info->model));
39 EBCASC(info->sequence, sizeof(info->sequence));
40 EBCASC(info->plant, sizeof(info->plant));
41 EBCASC(info->model_capacity, sizeof(info->model_capacity));
42 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
43 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
44 len += sprintf(page + len, "Manufacturer: %-16.16s\n",
45 info->manufacturer);
46 len += sprintf(page + len, "Type: %-4.4s\n",
47 info->type);
48 if (info->model[0] != '\0')
49 /*
50 * Sigh: the model field has been renamed with System z9
51 * to model_capacity and a new model field has been added
52 * after the plant field. To avoid confusing older programs
53 * the "Model:" prints "model_capacity model" or just
54 * "model_capacity" if the model string is empty .
55 */
56 len += sprintf(page + len,
57 "Model: %-16.16s %-16.16s\n",
58 info->model_capacity, info->model);
59 else
60 len += sprintf(page + len, "Model: %-16.16s\n",
61 info->model_capacity);
62 len += sprintf(page + len, "Sequence Code: %-16.16s\n",
63 info->sequence);
64 len += sprintf(page + len, "Plant: %-4.4s\n",
65 info->plant);
66 len += sprintf(page + len, "Model Capacity: %-16.16s %08u\n",
67 info->model_capacity, *(u32 *) info->model_cap_rating);
68 if (info->model_perm_cap[0] != '\0')
69 len += sprintf(page + len,
70 "Model Perm. Capacity: %-16.16s %08u\n",
71 info->model_perm_cap,
72 *(u32 *) info->model_perm_cap_rating);
73 if (info->model_temp_cap[0] != '\0')
74 len += sprintf(page + len,
75 "Model Temp. Capacity: %-16.16s %08u\n",
76 info->model_temp_cap,
77 *(u32 *) info->model_temp_cap_rating);
78 if (info->cai) {
79 len += sprintf(page + len,
80 "Capacity Adj. Ind.: %d\n",
81 info->cai);
82 len += sprintf(page + len, "Capacity Ch. Reason: %d\n",
83 info->ccr);
84 }
85 return len;
86 }
87
88 static int stsi_15_1_x(struct sysinfo_15_1_x *info, char *page, int len)
89 {
90 static int max_mnest;
91 int i, rc;
92
93 len += sprintf(page + len, "\n");
94 if (!MACHINE_HAS_TOPOLOGY)
95 return len;
96 if (max_mnest) {
97 stsi(info, 15, 1, max_mnest);
98 } else {
99 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
100 rc = stsi(info, 15, 1, max_mnest);
101 if (rc != -ENOSYS)
102 break;
103 }
104 }
105 len += sprintf(page + len, "CPU Topology HW: ");
106 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
107 len += sprintf(page + len, " %d", info->mag[i]);
108 len += sprintf(page + len, "\n");
109 #ifdef CONFIG_SCHED_MC
110 store_topology(info);
111 len += sprintf(page + len, "CPU Topology SW: ");
112 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
113 len += sprintf(page + len, " %d", info->mag[i]);
114 len += sprintf(page + len, "\n");
115 #endif
116 return len;
117 }
118
119 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
120 {
121 struct sysinfo_1_2_2_extension *ext;
122 int i;
123
124 if (stsi(info, 1, 2, 2) == -ENOSYS)
125 return len;
126 ext = (struct sysinfo_1_2_2_extension *)
127 ((unsigned long) info + info->acc_offset);
128
129 len += sprintf(page + len, "CPUs Total: %d\n",
130 info->cpus_total);
131 len += sprintf(page + len, "CPUs Configured: %d\n",
132 info->cpus_configured);
133 len += sprintf(page + len, "CPUs Standby: %d\n",
134 info->cpus_standby);
135 len += sprintf(page + len, "CPUs Reserved: %d\n",
136 info->cpus_reserved);
137
138 if (info->format == 1) {
139 /*
140 * Sigh 2. According to the specification the alternate
141 * capability field is a 32 bit floating point number
142 * if the higher order 8 bits are not zero. Printing
143 * a floating point number in the kernel is a no-no,
144 * always print the number as 32 bit unsigned integer.
145 * The user-space needs to know about the strange
146 * encoding of the alternate cpu capability.
147 */
148 len += sprintf(page + len, "Capability: %u %u\n",
149 info->capability, ext->alt_capability);
150 for (i = 2; i <= info->cpus_total; i++)
151 len += sprintf(page + len,
152 "Adjustment %02d-way: %u %u\n",
153 i, info->adjustment[i-2],
154 ext->alt_adjustment[i-2]);
155
156 } else {
157 len += sprintf(page + len, "Capability: %u\n",
158 info->capability);
159 for (i = 2; i <= info->cpus_total; i++)
160 len += sprintf(page + len,
161 "Adjustment %02d-way: %u\n",
162 i, info->adjustment[i-2]);
163 }
164
165 if (info->secondary_capability != 0)
166 len += sprintf(page + len, "Secondary Capability: %d\n",
167 info->secondary_capability);
168 return len;
169 }
170
171 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
172 {
173 if (stsi(info, 2, 2, 2) == -ENOSYS)
174 return len;
175
176 EBCASC(info->name, sizeof(info->name));
177
178 len += sprintf(page + len, "\n");
179 len += sprintf(page + len, "LPAR Number: %d\n",
180 info->lpar_number);
181
182 len += sprintf(page + len, "LPAR Characteristics: ");
183 if (info->characteristics & LPAR_CHAR_DEDICATED)
184 len += sprintf(page + len, "Dedicated ");
185 if (info->characteristics & LPAR_CHAR_SHARED)
186 len += sprintf(page + len, "Shared ");
187 if (info->characteristics & LPAR_CHAR_LIMITED)
188 len += sprintf(page + len, "Limited ");
189 len += sprintf(page + len, "\n");
190
191 len += sprintf(page + len, "LPAR Name: %-8.8s\n",
192 info->name);
193
194 len += sprintf(page + len, "LPAR Adjustment: %d\n",
195 info->caf);
196
197 len += sprintf(page + len, "LPAR CPUs Total: %d\n",
198 info->cpus_total);
199 len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
200 info->cpus_configured);
201 len += sprintf(page + len, "LPAR CPUs Standby: %d\n",
202 info->cpus_standby);
203 len += sprintf(page + len, "LPAR CPUs Reserved: %d\n",
204 info->cpus_reserved);
205 len += sprintf(page + len, "LPAR CPUs Dedicated: %d\n",
206 info->cpus_dedicated);
207 len += sprintf(page + len, "LPAR CPUs Shared: %d\n",
208 info->cpus_shared);
209 return len;
210 }
211
212 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
213 {
214 int i;
215
216 if (stsi(info, 3, 2, 2) == -ENOSYS)
217 return len;
218 for (i = 0; i < info->count; i++) {
219 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
220 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
221 len += sprintf(page + len, "\n");
222 len += sprintf(page + len, "VM%02d Name: %-8.8s\n",
223 i, info->vm[i].name);
224 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
225 i, info->vm[i].cpi);
226
227 len += sprintf(page + len, "VM%02d Adjustment: %d\n",
228 i, info->vm[i].caf);
229
230 len += sprintf(page + len, "VM%02d CPUs Total: %d\n",
231 i, info->vm[i].cpus_total);
232 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
233 i, info->vm[i].cpus_configured);
234 len += sprintf(page + len, "VM%02d CPUs Standby: %d\n",
235 i, info->vm[i].cpus_standby);
236 len += sprintf(page + len, "VM%02d CPUs Reserved: %d\n",
237 i, info->vm[i].cpus_reserved);
238 }
239 return len;
240 }
241
242 static int proc_read_sysinfo(char *page, char **start,
243 off_t off, int count,
244 int *eof, void *data)
245 {
246 unsigned long info = get_zeroed_page(GFP_KERNEL);
247 int level, len;
248
249 if (!info)
250 return 0;
251
252 len = 0;
253 level = stsi_0();
254 if (level >= 1)
255 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
256
257 if (level >= 1)
258 len = stsi_15_1_x((struct sysinfo_15_1_x *) info, page, len);
259
260 if (level >= 1)
261 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
262
263 if (level >= 2)
264 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
265
266 if (level >= 3)
267 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
268
269 free_page(info);
270 return len;
271 }
272
273 static __init int create_proc_sysinfo(void)
274 {
275 create_proc_read_entry("sysinfo", 0444, NULL,
276 proc_read_sysinfo, NULL);
277 return 0;
278 }
279 device_initcall(create_proc_sysinfo);
280
281 /*
282 * Service levels interface.
283 */
284
285 static DECLARE_RWSEM(service_level_sem);
286 static LIST_HEAD(service_level_list);
287
288 int register_service_level(struct service_level *slr)
289 {
290 struct service_level *ptr;
291
292 down_write(&service_level_sem);
293 list_for_each_entry(ptr, &service_level_list, list)
294 if (ptr == slr) {
295 up_write(&service_level_sem);
296 return -EEXIST;
297 }
298 list_add_tail(&slr->list, &service_level_list);
299 up_write(&service_level_sem);
300 return 0;
301 }
302 EXPORT_SYMBOL(register_service_level);
303
304 int unregister_service_level(struct service_level *slr)
305 {
306 struct service_level *ptr, *next;
307 int rc = -ENOENT;
308
309 down_write(&service_level_sem);
310 list_for_each_entry_safe(ptr, next, &service_level_list, list) {
311 if (ptr != slr)
312 continue;
313 list_del(&ptr->list);
314 rc = 0;
315 break;
316 }
317 up_write(&service_level_sem);
318 return rc;
319 }
320 EXPORT_SYMBOL(unregister_service_level);
321
322 static void *service_level_start(struct seq_file *m, loff_t *pos)
323 {
324 down_read(&service_level_sem);
325 return seq_list_start(&service_level_list, *pos);
326 }
327
328 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
329 {
330 return seq_list_next(p, &service_level_list, pos);
331 }
332
333 static void service_level_stop(struct seq_file *m, void *p)
334 {
335 up_read(&service_level_sem);
336 }
337
338 static int service_level_show(struct seq_file *m, void *p)
339 {
340 struct service_level *slr;
341
342 slr = list_entry(p, struct service_level, list);
343 slr->seq_print(m, slr);
344 return 0;
345 }
346
347 static const struct seq_operations service_level_seq_ops = {
348 .start = service_level_start,
349 .next = service_level_next,
350 .stop = service_level_stop,
351 .show = service_level_show
352 };
353
354 static int service_level_open(struct inode *inode, struct file *file)
355 {
356 return seq_open(file, &service_level_seq_ops);
357 }
358
359 static const struct file_operations service_level_ops = {
360 .open = service_level_open,
361 .read = seq_read,
362 .llseek = seq_lseek,
363 .release = seq_release
364 };
365
366 static void service_level_vm_print(struct seq_file *m,
367 struct service_level *slr)
368 {
369 char *query_buffer, *str;
370
371 query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
372 if (!query_buffer)
373 return;
374 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
375 str = strchr(query_buffer, '\n');
376 if (str)
377 *str = 0;
378 seq_printf(m, "VM: %s\n", query_buffer);
379 kfree(query_buffer);
380 }
381
382 static struct service_level service_level_vm = {
383 .seq_print = service_level_vm_print
384 };
385
386 static __init int create_proc_service_level(void)
387 {
388 proc_create("service_levels", 0, NULL, &service_level_ops);
389 if (MACHINE_IS_VM)
390 register_service_level(&service_level_vm);
391 return 0;
392 }
393 subsys_initcall(create_proc_service_level);
394
395 /*
396 * Bogomips calculation based on cpu capability.
397 */
398 int get_cpu_capability(unsigned int *capability)
399 {
400 struct sysinfo_1_2_2 *info;
401 int rc;
402
403 info = (void *) get_zeroed_page(GFP_KERNEL);
404 if (!info)
405 return -ENOMEM;
406 rc = stsi(info, 1, 2, 2);
407 if (rc == -ENOSYS)
408 goto out;
409 rc = 0;
410 *capability = info->capability;
411 out:
412 free_page((unsigned long) info);
413 return rc;
414 }
415
416 /*
417 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
418 */
419 void s390_adjust_jiffies(void)
420 {
421 struct sysinfo_1_2_2 *info;
422 const unsigned int fmil = 0x4b189680; /* 1e7 as 32-bit float. */
423 FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
424 FP_DECL_EX;
425 unsigned int capability;
426
427 info = (void *) get_zeroed_page(GFP_KERNEL);
428 if (!info)
429 return;
430
431 if (stsi(info, 1, 2, 2) != -ENOSYS) {
432 /*
433 * Major sigh. The cpu capability encoding is "special".
434 * If the first 9 bits of info->capability are 0 then it
435 * is a 32 bit unsigned integer in the range 0 .. 2^23.
436 * If the first 9 bits are != 0 then it is a 32 bit float.
437 * In addition a lower value indicates a proportionally
438 * higher cpu capacity. Bogomips are the other way round.
439 * To get to a halfway suitable number we divide 1e7
440 * by the cpu capability number. Yes, that means a floating
441 * point division .. math-emu here we come :-)
442 */
443 FP_UNPACK_SP(SA, &fmil);
444 if ((info->capability >> 23) == 0)
445 FP_FROM_INT_S(SB, (long) info->capability, 64, long);
446 else
447 FP_UNPACK_SP(SB, &info->capability);
448 FP_DIV_S(SR, SA, SB);
449 FP_TO_INT_S(capability, SR, 32, 0);
450 } else
451 /*
452 * Really old machine without stsi block for basic
453 * cpu information. Report 42.0 bogomips.
454 */
455 capability = 42;
456 loops_per_jiffy = capability * (500000/HZ);
457 free_page((unsigned long) info);
458 }
459
460 /*
461 * calibrate the delay loop
462 */
463 void __cpuinit calibrate_delay(void)
464 {
465 s390_adjust_jiffies();
466 /* Print the good old Bogomips line .. */
467 printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
468 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
469 (loops_per_jiffy/(5000/HZ)) % 100);
470 }