1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2001, 2009
4 * Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
6 */
7
8 #include <linux/debugfs.h>
9 #include <linux/kernel.h>
10 #include <linux/mm.h>
11 #include <linux/proc_fs.h>
12 #include <linux/seq_file.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
15 #include <linux/export.h>
16 #include <linux/slab.h>
17 #include <asm/asm-extable.h>
18 #include <asm/ebcdic.h>
19 #include <asm/debug.h>
20 #include <asm/sysinfo.h>
21 #include <asm/cpcmd.h>
22 #include <asm/topology.h>
23 #include <asm/fpu.h>
24
25 int topology_max_mnest;
26
27 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
28 {
29 int r0 = (fc << 28) | sel1;
30 int rc = 0;
31
32 asm volatile(
33 " lr 0,%[r0]\n"
34 " lr 1,%[r1]\n"
35 " stsi 0(%[sysinfo])\n"
36 "0: jz 2f\n"
37 "1: lhi %[rc],%[retval]\n"
38 "2: lr %[r0],0\n"
39 EX_TABLE(0b, 1b)
40 : [r0] "+d" (r0), [rc] "+d" (rc)
41 : [r1] "d" (sel2),
42 [sysinfo] "a" (sysinfo),
43 [retval] "K" (-EOPNOTSUPP)
44 : "cc", "", "1", "memory");
45 *lvl = ((unsigned int) r0) >> 28;
46 return rc;
47 }
48
49 /*
50 * stsi - store system information
51 *
52 * Returns the current configuration level if function code 0 was specified.
53 * Otherwise returns 0 on success or a negative value on error.
54 */
55 int stsi(void *sysinfo, int fc, int sel1, int sel2)
56 {
57 int lvl, rc;
58
59 rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
60 if (rc)
61 return rc;
62 return fc ? 0 : lvl;
63 }
64 EXPORT_SYMBOL(stsi);
65
66 #ifdef CONFIG_PROC_FS
67
68 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
69 {
70 switch (encoding) {
71 case 1: /* EBCDIC */
72 EBCASC(name, len);
73 break;
74 case 2: /* UTF-8 */
75 break;
76 default:
77 return false;
78 }
79 return true;
80 }
81
82 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
83 {
84 bool has_var_cap;
85 int i;
86
87 if (stsi(info, 1, 1, 1))
88 return;
89 has_var_cap = !!info->model_var_cap[0];
90 EBCASC(info->manufacturer, sizeof(info->manufacturer));
91 EBCASC(info->type, sizeof(info->type));
92 EBCASC(info->model, sizeof(info->model));
93 EBCASC(info->sequence, sizeof(info->sequence));
94 EBCASC(info->plant, sizeof(info->plant));
95 EBCASC(info->model_capacity, sizeof(info->model_capacity));
96 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
97 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
98 if (has_var_cap)
99 EBCASC(info->model_var_cap, sizeof(info->model_var_cap));
100 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer);
101 seq_printf(m, "Type: %-4.4s\n", info->type);
102 if (info->lic)
103 seq_printf(m, "LIC Identifier: %016lx\n", info->lic);
104 /*
105 * Sigh: the model field has been renamed with System z9
106 * to model_capacity and a new model field has been added
107 * after the plant field. To avoid confusing older programs
108 * the "Model:" prints "model_capacity model" or just
109 * "model_capacity" if the model string is empty .
110 */
111 seq_printf(m, "Model: %-16.16s", info->model_capacity);
112 if (info->model[0] != '\0')
113 seq_printf(m, " %-16.16s", info->model);
114 seq_putc(m, '\n');
115 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence);
116 seq_printf(m, "Plant: %-4.4s\n", info->plant);
117 seq_printf(m, "Model Capacity: %-16.16s %08u\n",
118 info->model_capacity, info->model_cap_rating);
119 if (info->model_perm_cap_rating)
120 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
121 info->model_perm_cap,
122 info->model_perm_cap_rating);
123 if (info->model_temp_cap_rating)
124 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
125 info->model_temp_cap,
126 info->model_temp_cap_rating);
127 if (has_var_cap && info->model_var_cap_rating)
128 seq_printf(m, "Model Var. Capacity: %-16.16s %08u\n",
129 info->model_var_cap,
130 info->model_var_cap_rating);
131 if (info->ncr)
132 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr);
133 if (info->npr)
134 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
135 if (info->ntr)
136 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
137 if (has_var_cap && info->nvr)
138 seq_printf(m, "Nominal Var. Rating: %08u\n", info->nvr);
139 if (info->cai) {
140 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai);
141 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr);
142 seq_printf(m, "Capacity Transient: %d\n", info->t);
143 }
144 if (info->p) {
145 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
146 seq_printf(m, "Type %d Percentage: %d\n",
147 i, info->typepct[i - 1]);
148 }
149 }
150 }
151
152 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
153 {
154 int i;
155
156 seq_putc(m, '\n');
157 if (!MACHINE_HAS_TOPOLOGY)
158 return;
159 if (stsi(info, 15, 1, topology_max_mnest))
160 return;
161 seq_printf(m, "CPU Topology HW: ");
162 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
163 seq_printf(m, " %d", info->mag[i]);
164 seq_putc(m, '\n');
165 #ifdef CONFIG_SCHED_TOPOLOGY
166 store_topology(info);
167 seq_printf(m, "CPU Topology SW: ");
168 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
169 seq_printf(m, " %d", info->mag[i]);
170 seq_putc(m, '\n');
171 #endif
172 }
173
174 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
175 {
176 struct sysinfo_1_2_2_extension *ext;
177 int i;
178
179 if (stsi(info, 1, 2, 2))
180 return;
181 ext = (struct sysinfo_1_2_2_extension *)
182 ((unsigned long) info + info->acc_offset);
183 seq_printf(m, "CPUs Total: %d\n", info->cpus_total);
184 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured);
185 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby);
186 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved);
187 if (info->mt_installed) {
188 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid);
189 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid);
190 }
191 /*
192 * Sigh 2. According to the specification the alternate
193 * capability field is a 32 bit floating point number
194 * if the higher order 8 bits are not zero. Printing
195 * a floating point number in the kernel is a no-no,
196 * always print the number as 32 bit unsigned integer.
197 * The user-space needs to know about the strange
198 * encoding of the alternate cpu capability.
199 */
200 seq_printf(m, "Capability: %u", info->capability);
201 if (info->format == 1)
202 seq_printf(m, " %u", ext->alt_capability);
203 seq_putc(m, '\n');
204 if (info->nominal_cap)
205 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap);
206 if (info->secondary_cap)
207 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
208 for (i = 2; i <= info->cpus_total; i++) {
209 seq_printf(m, "Adjustment %02d-way: %u",
210 i, info->adjustment[i-2]);
211 if (info->format == 1)
212 seq_printf(m, " %u", ext->alt_adjustment[i-2]);
213 seq_putc(m, '\n');
214 }
215 }
216
217 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
218 {
219 if (stsi(info, 2, 2, 2))
220 return;
221 EBCASC(info->name, sizeof(info->name));
222 seq_putc(m, '\n');
223 seq_printf(m, "LPAR Number: %d\n", info->lpar_number);
224 seq_printf(m, "LPAR Characteristics: ");
225 if (info->characteristics & LPAR_CHAR_DEDICATED)
226 seq_printf(m, "Dedicated ");
227 if (info->characteristics & LPAR_CHAR_SHARED)
228 seq_printf(m, "Shared ");
229 if (info->characteristics & LPAR_CHAR_LIMITED)
230 seq_printf(m, "Limited ");
231 seq_putc(m, '\n');
232 seq_printf(m, "LPAR Name: %-8.8s\n", info->name);
233 seq_printf(m, "LPAR Adjustment: %d\n", info->caf);
234 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total);
235 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
236 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby);
237 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved);
238 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated);
239 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared);
240 if (info->mt_installed) {
241 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid);
242 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid);
243 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid);
244 }
245 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
246 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name);
247 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid);
248 }
249 }
250
251 static void print_ext_name(struct seq_file *m, int lvl,
252 struct sysinfo_3_2_2 *info)
253 {
254 size_t len = sizeof(info->ext_names[lvl]);
255
256 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
257 return;
258 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl,
259 info->ext_names[lvl]);
260 }
261
262 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
263 {
264 if (uuid_is_null(&info->vm[i].uuid))
265 return;
266 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid);
267 }
268
269 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
270 {
271 int i;
272
273 if (stsi(info, 3, 2, 2))
274 return;
275 for (i = 0; i < info->count; i++) {
276 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
277 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
278 seq_putc(m, '\n');
279 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name);
280 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
281 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf);
282 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total);
283 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
284 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby);
285 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved);
286 print_ext_name(m, i, info);
287 print_uuid(m, i, info);
288 }
289 }
290
291 static int sysinfo_show(struct seq_file *m, void *v)
292 {
293 void *info = (void *)get_zeroed_page(GFP_KERNEL);
294 int level;
295
296 if (!info)
297 return 0;
298 level = stsi(NULL, 0, 0, 0);
299 if (level >= 1)
300 stsi_1_1_1(m, info);
301 if (level >= 1)
302 stsi_15_1_x(m, info);
303 if (level >= 1)
304 stsi_1_2_2(m, info);
305 if (level >= 2)
306 stsi_2_2_2(m, info);
307 if (level >= 3)
308 stsi_3_2_2(m, info);
309 free_page((unsigned long)info);
310 return 0;
311 }
312
313 static int __init sysinfo_create_proc(void)
314 {
315 proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
316 return 0;
317 }
318 device_initcall(sysinfo_create_proc);
319
320 #endif /* CONFIG_PROC_FS */
321
322 /*
323 * Service levels interface.
324 */
325
326 static DECLARE_RWSEM(service_level_sem);
327 static LIST_HEAD(service_level_list);
328
329 int register_service_level(struct service_level *slr)
330 {
331 struct service_level *ptr;
332
333 down_write(&service_level_sem);
334 list_for_each_entry(ptr, &service_level_list, list)
335 if (ptr == slr) {
336 up_write(&service_level_sem);
337 return -EEXIST;
338 }
339 list_add_tail(&slr->list, &service_level_list);
340 up_write(&service_level_sem);
341 return 0;
342 }
343 EXPORT_SYMBOL(register_service_level);
344
345 int unregister_service_level(struct service_level *slr)
346 {
347 struct service_level *ptr, *next;
348 int rc = -ENOENT;
349
350 down_write(&service_level_sem);
351 list_for_each_entry_safe(ptr, next, &service_level_list, list) {
352 if (ptr != slr)
353 continue;
354 list_del(&ptr->list);
355 rc = 0;
356 break;
357 }
358 up_write(&service_level_sem);
359 return rc;
360 }
361 EXPORT_SYMBOL(unregister_service_level);
362
363 static void *service_level_start(struct seq_file *m, loff_t *pos)
364 {
365 down_read(&service_level_sem);
366 return seq_list_start(&service_level_list, *pos);
367 }
368
369 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
370 {
371 return seq_list_next(p, &service_level_list, pos);
372 }
373
374 static void service_level_stop(struct seq_file *m, void *p)
375 {
376 up_read(&service_level_sem);
377 }
378
379 static int service_level_show(struct seq_file *m, void *p)
380 {
381 struct service_level *slr;
382
383 slr = list_entry(p, struct service_level, list);
384 slr->seq_print(m, slr);
385 return 0;
386 }
387
388 static const struct seq_operations service_level_seq_ops = {
389 .start = service_level_start,
390 .next = service_level_next,
391 .stop = service_level_stop,
392 .show = service_level_show
393 };
394
395 static void service_level_vm_print(struct seq_file *m,
396 struct service_level *slr)
397 {
398 char *query_buffer, *str;
399
400 query_buffer = kmalloc(1024, GFP_KERNEL);
401 if (!query_buffer)
402 return;
403 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
404 str = strchr(query_buffer, '\n');
405 if (str)
406 *str = 0;
407 seq_printf(m, "VM: %s\n", query_buffer);
408 kfree(query_buffer);
409 }
410
411 static struct service_level service_level_vm = {
412 .seq_print = service_level_vm_print
413 };
414
415 static __init int create_proc_service_level(void)
416 {
417 proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
418 if (MACHINE_IS_VM)
419 register_service_level(&service_level_vm);
420 return 0;
421 }
422 subsys_initcall(create_proc_service_level);
423
424 /*
425 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
426 */
427 void s390_adjust_jiffies(void)
428 {
429 DECLARE_KERNEL_FPU_ONSTACK16(fpu);
430 struct sysinfo_1_2_2 *info;
431 unsigned long capability;
432
433 info = (void *) get_zeroed_page(GFP_KERNEL);
434 if (!info)
435 return;
436
437 if (stsi(info, 1, 2, 2) == 0) {
438 /*
439 * Major sigh. The cpu capability encoding is "special".
440 * If the first 9 bits of info->capability are 0 then it
441 * is a 32 bit unsigned integer in the range 0 .. 2^23.
442 * If the first 9 bits are != 0 then it is a 32 bit float.
443 * In addition a lower value indicates a proportionally
444 * higher cpu capacity. Bogomips are the other way round.
445 * To get to a halfway suitable number we divide 1e7
446 * by the cpu capability number. Yes, that means a floating
447 * point division ..
448 */
449 kernel_fpu_begin(&fpu, KERNEL_FPR);
450 fpu_sfpc(0);
451 if (info->capability & 0xff800000)
452 fpu_ldgr(2, info->capability);
453 else
454 fpu_cefbr(2, info->capability);
455 fpu_cefbr(0, 10000000);
456 fpu_debr(0, 2);
457 capability = fpu_cgebr(0, 5);
458 kernel_fpu_end(&fpu, KERNEL_FPR);
459 } else
460 /*
461 * Really old machine without stsi block for basic
462 * cpu information. Report 42.0 bogomips.
463 */
464 capability = 42;
465 loops_per_jiffy = capability * (500000/HZ);
466 free_page((unsigned long) info);
467 }
468
469 /*
470 * calibrate the delay loop
471 */
472 void calibrate_delay(void)
473 {
474 s390_adjust_jiffies();
475 /* Print the good old Bogomips line .. */
476 printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
477 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
478 (loops_per_jiffy/(5000/HZ)) % 100);
479 }
480
481 #ifdef CONFIG_DEBUG_FS
482
483 #define STSI_FILE(fc, s1, s2) \
484 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
485 { \
486 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \
487 if (!file->private_data) \
488 return -ENOMEM; \
489 if (stsi(file->private_data, fc, s1, s2)) { \
490 free_page((unsigned long)file->private_data); \
491 file->private_data = NULL; \
492 return -EACCES; \
493 } \
494 return nonseekable_open(inode, file); \
495 } \
496 \
497 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \
498 .open = stsi_open_##fc##_##s1##_##s2, \
499 .release = stsi_release, \
500 .read = stsi_read, \
501 .llseek = no_llseek, \
502 };
503
504 static int stsi_release(struct inode *inode, struct file *file)
505 {
506 free_page((unsigned long)file->private_data);
507 return 0;
508 }
509
510 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
511 {
512 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
513 }
514
515 STSI_FILE( 1, 1, 1);
516 STSI_FILE( 1, 2, 1);
517 STSI_FILE( 1, 2, 2);
518 STSI_FILE( 2, 2, 1);
519 STSI_FILE( 2, 2, 2);
520 STSI_FILE( 3, 2, 2);
521 STSI_FILE(15, 1, 2);
522 STSI_FILE(15, 1, 3);
523 STSI_FILE(15, 1, 4);
524 STSI_FILE(15, 1, 5);
525 STSI_FILE(15, 1, 6);
526
527 struct stsi_file {
528 const struct file_operations *fops;
529 char *name;
530 };
531
532 static struct stsi_file stsi_file[] __initdata = {
533 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"},
534 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"},
535 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"},
536 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"},
537 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"},
538 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"},
539 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
540 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
541 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
542 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
543 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
544 };
545
546 static u8 stsi_0_0_0;
547
548 static __init int stsi_init_debugfs(void)
549 {
550 struct dentry *stsi_root;
551 struct stsi_file *sf;
552 int lvl, i;
553
554 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
555 lvl = stsi(NULL, 0, 0, 0);
556 if (lvl > 0)
557 stsi_0_0_0 = lvl;
558 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
559 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
560 sf = &stsi_file[i];
561 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
562 }
563 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
564 char link_to[10];
565
566 sprintf(link_to, "15_1_%d", topology_mnest_limit());
567 debugfs_create_symlink("topology", stsi_root, link_to);
568 }
569 return 0;
570 }
571 device_initcall(stsi_init_debugfs);
572
573 #endif /* CONFIG_DEBUG_FS */
574
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