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