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/api.h>
24
25 int topology_max_mnest;
26
__stsi(void * sysinfo,int fc,int sel1,int sel2,int * lvl)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", "0", "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 */
stsi(void * sysinfo,int fc,int sel1,int sel2)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
convert_ext_name(unsigned char encoding,char * name,size_t len)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
stsi_1_1_1(struct seq_file * m,struct sysinfo_1_1_1 * info)82 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
83 {
84 int i;
85
86 if (stsi(info, 1, 1, 1))
87 return;
88 EBCASC(info->manufacturer, sizeof(info->manufacturer));
89 EBCASC(info->type, sizeof(info->type));
90 EBCASC(info->model, sizeof(info->model));
91 EBCASC(info->sequence, sizeof(info->sequence));
92 EBCASC(info->plant, sizeof(info->plant));
93 EBCASC(info->model_capacity, sizeof(info->model_capacity));
94 EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
95 EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
96 seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer);
97 seq_printf(m, "Type: %-4.4s\n", info->type);
98 if (info->lic)
99 seq_printf(m, "LIC Identifier: %016lx\n", info->lic);
100 /*
101 * Sigh: the model field has been renamed with System z9
102 * to model_capacity and a new model field has been added
103 * after the plant field. To avoid confusing older programs
104 * the "Model:" prints "model_capacity model" or just
105 * "model_capacity" if the model string is empty .
106 */
107 seq_printf(m, "Model: %-16.16s", info->model_capacity);
108 if (info->model[0] != '\0')
109 seq_printf(m, " %-16.16s", info->model);
110 seq_putc(m, '\n');
111 seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence);
112 seq_printf(m, "Plant: %-4.4s\n", info->plant);
113 seq_printf(m, "Model Capacity: %-16.16s %08u\n",
114 info->model_capacity, info->model_cap_rating);
115 if (info->model_perm_cap_rating)
116 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
117 info->model_perm_cap,
118 info->model_perm_cap_rating);
119 if (info->model_temp_cap_rating)
120 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
121 info->model_temp_cap,
122 info->model_temp_cap_rating);
123 if (info->ncr)
124 seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr);
125 if (info->npr)
126 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
127 if (info->ntr)
128 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
129 if (info->cai) {
130 seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai);
131 seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr);
132 seq_printf(m, "Capacity Transient: %d\n", info->t);
133 }
134 if (info->p) {
135 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
136 seq_printf(m, "Type %d Percentage: %d\n",
137 i, info->typepct[i - 1]);
138 }
139 }
140 }
141
stsi_15_1_x(struct seq_file * m,struct sysinfo_15_1_x * info)142 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
143 {
144 int i;
145
146 seq_putc(m, '\n');
147 if (!MACHINE_HAS_TOPOLOGY)
148 return;
149 if (stsi(info, 15, 1, topology_max_mnest))
150 return;
151 seq_printf(m, "CPU Topology HW: ");
152 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
153 seq_printf(m, " %d", info->mag[i]);
154 seq_putc(m, '\n');
155 #ifdef CONFIG_SCHED_TOPOLOGY
156 store_topology(info);
157 seq_printf(m, "CPU Topology SW: ");
158 for (i = 0; i < TOPOLOGY_NR_MAG; i++)
159 seq_printf(m, " %d", info->mag[i]);
160 seq_putc(m, '\n');
161 #endif
162 }
163
stsi_1_2_2(struct seq_file * m,struct sysinfo_1_2_2 * info)164 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
165 {
166 struct sysinfo_1_2_2_extension *ext;
167 int i;
168
169 if (stsi(info, 1, 2, 2))
170 return;
171 ext = (struct sysinfo_1_2_2_extension *)
172 ((unsigned long) info + info->acc_offset);
173 seq_printf(m, "CPUs Total: %d\n", info->cpus_total);
174 seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured);
175 seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby);
176 seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved);
177 if (info->mt_installed) {
178 seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid);
179 seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid);
180 }
181 /*
182 * Sigh 2. According to the specification the alternate
183 * capability field is a 32 bit floating point number
184 * if the higher order 8 bits are not zero. Printing
185 * a floating point number in the kernel is a no-no,
186 * always print the number as 32 bit unsigned integer.
187 * The user-space needs to know about the strange
188 * encoding of the alternate cpu capability.
189 */
190 seq_printf(m, "Capability: %u", info->capability);
191 if (info->format == 1)
192 seq_printf(m, " %u", ext->alt_capability);
193 seq_putc(m, '\n');
194 if (info->nominal_cap)
195 seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap);
196 if (info->secondary_cap)
197 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
198 for (i = 2; i <= info->cpus_total; i++) {
199 seq_printf(m, "Adjustment %02d-way: %u",
200 i, info->adjustment[i-2]);
201 if (info->format == 1)
202 seq_printf(m, " %u", ext->alt_adjustment[i-2]);
203 seq_putc(m, '\n');
204 }
205 }
206
stsi_2_2_2(struct seq_file * m,struct sysinfo_2_2_2 * info)207 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
208 {
209 if (stsi(info, 2, 2, 2))
210 return;
211 EBCASC(info->name, sizeof(info->name));
212 seq_putc(m, '\n');
213 seq_printf(m, "LPAR Number: %d\n", info->lpar_number);
214 seq_printf(m, "LPAR Characteristics: ");
215 if (info->characteristics & LPAR_CHAR_DEDICATED)
216 seq_printf(m, "Dedicated ");
217 if (info->characteristics & LPAR_CHAR_SHARED)
218 seq_printf(m, "Shared ");
219 if (info->characteristics & LPAR_CHAR_LIMITED)
220 seq_printf(m, "Limited ");
221 seq_putc(m, '\n');
222 seq_printf(m, "LPAR Name: %-8.8s\n", info->name);
223 seq_printf(m, "LPAR Adjustment: %d\n", info->caf);
224 seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total);
225 seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
226 seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby);
227 seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved);
228 seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated);
229 seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared);
230 if (info->mt_installed) {
231 seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid);
232 seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid);
233 seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid);
234 }
235 if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
236 seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name);
237 seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid);
238 }
239 }
240
print_ext_name(struct seq_file * m,int lvl,struct sysinfo_3_2_2 * info)241 static void print_ext_name(struct seq_file *m, int lvl,
242 struct sysinfo_3_2_2 *info)
243 {
244 size_t len = sizeof(info->ext_names[lvl]);
245
246 if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
247 return;
248 seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl,
249 info->ext_names[lvl]);
250 }
251
print_uuid(struct seq_file * m,int i,struct sysinfo_3_2_2 * info)252 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
253 {
254 if (uuid_is_null(&info->vm[i].uuid))
255 return;
256 seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid);
257 }
258
stsi_3_2_2(struct seq_file * m,struct sysinfo_3_2_2 * info)259 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
260 {
261 int i;
262
263 if (stsi(info, 3, 2, 2))
264 return;
265 for (i = 0; i < info->count; i++) {
266 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
267 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
268 seq_putc(m, '\n');
269 seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name);
270 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
271 seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf);
272 seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total);
273 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
274 seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby);
275 seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved);
276 print_ext_name(m, i, info);
277 print_uuid(m, i, info);
278 }
279 }
280
sysinfo_show(struct seq_file * m,void * v)281 static int sysinfo_show(struct seq_file *m, void *v)
282 {
283 void *info = (void *)get_zeroed_page(GFP_KERNEL);
284 int level;
285
286 if (!info)
287 return 0;
288 level = stsi(NULL, 0, 0, 0);
289 if (level >= 1)
290 stsi_1_1_1(m, info);
291 if (level >= 1)
292 stsi_15_1_x(m, info);
293 if (level >= 1)
294 stsi_1_2_2(m, info);
295 if (level >= 2)
296 stsi_2_2_2(m, info);
297 if (level >= 3)
298 stsi_3_2_2(m, info);
299 free_page((unsigned long)info);
300 return 0;
301 }
302
sysinfo_create_proc(void)303 static int __init sysinfo_create_proc(void)
304 {
305 proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
306 return 0;
307 }
308 device_initcall(sysinfo_create_proc);
309
310 #endif /* CONFIG_PROC_FS */
311
312 /*
313 * Service levels interface.
314 */
315
316 static DECLARE_RWSEM(service_level_sem);
317 static LIST_HEAD(service_level_list);
318
register_service_level(struct service_level * slr)319 int register_service_level(struct service_level *slr)
320 {
321 struct service_level *ptr;
322
323 down_write(&service_level_sem);
324 list_for_each_entry(ptr, &service_level_list, list)
325 if (ptr == slr) {
326 up_write(&service_level_sem);
327 return -EEXIST;
328 }
329 list_add_tail(&slr->list, &service_level_list);
330 up_write(&service_level_sem);
331 return 0;
332 }
333 EXPORT_SYMBOL(register_service_level);
334
unregister_service_level(struct service_level * slr)335 int unregister_service_level(struct service_level *slr)
336 {
337 struct service_level *ptr, *next;
338 int rc = -ENOENT;
339
340 down_write(&service_level_sem);
341 list_for_each_entry_safe(ptr, next, &service_level_list, list) {
342 if (ptr != slr)
343 continue;
344 list_del(&ptr->list);
345 rc = 0;
346 break;
347 }
348 up_write(&service_level_sem);
349 return rc;
350 }
351 EXPORT_SYMBOL(unregister_service_level);
352
service_level_start(struct seq_file * m,loff_t * pos)353 static void *service_level_start(struct seq_file *m, loff_t *pos)
354 {
355 down_read(&service_level_sem);
356 return seq_list_start(&service_level_list, *pos);
357 }
358
service_level_next(struct seq_file * m,void * p,loff_t * pos)359 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
360 {
361 return seq_list_next(p, &service_level_list, pos);
362 }
363
service_level_stop(struct seq_file * m,void * p)364 static void service_level_stop(struct seq_file *m, void *p)
365 {
366 up_read(&service_level_sem);
367 }
368
service_level_show(struct seq_file * m,void * p)369 static int service_level_show(struct seq_file *m, void *p)
370 {
371 struct service_level *slr;
372
373 slr = list_entry(p, struct service_level, list);
374 slr->seq_print(m, slr);
375 return 0;
376 }
377
378 static const struct seq_operations service_level_seq_ops = {
379 .start = service_level_start,
380 .next = service_level_next,
381 .stop = service_level_stop,
382 .show = service_level_show
383 };
384
service_level_vm_print(struct seq_file * m,struct service_level * slr)385 static void service_level_vm_print(struct seq_file *m,
386 struct service_level *slr)
387 {
388 char *query_buffer, *str;
389
390 query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
391 if (!query_buffer)
392 return;
393 cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
394 str = strchr(query_buffer, '\n');
395 if (str)
396 *str = 0;
397 seq_printf(m, "VM: %s\n", query_buffer);
398 kfree(query_buffer);
399 }
400
401 static struct service_level service_level_vm = {
402 .seq_print = service_level_vm_print
403 };
404
create_proc_service_level(void)405 static __init int create_proc_service_level(void)
406 {
407 proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
408 if (MACHINE_IS_VM)
409 register_service_level(&service_level_vm);
410 return 0;
411 }
412 subsys_initcall(create_proc_service_level);
413
414 /*
415 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
416 */
s390_adjust_jiffies(void)417 void s390_adjust_jiffies(void)
418 {
419 struct sysinfo_1_2_2 *info;
420 unsigned long capability;
421 struct kernel_fpu fpu;
422
423 info = (void *) get_zeroed_page(GFP_KERNEL);
424 if (!info)
425 return;
426
427 if (stsi(info, 1, 2, 2) == 0) {
428 /*
429 * Major sigh. The cpu capability encoding is "special".
430 * If the first 9 bits of info->capability are 0 then it
431 * is a 32 bit unsigned integer in the range 0 .. 2^23.
432 * If the first 9 bits are != 0 then it is a 32 bit float.
433 * In addition a lower value indicates a proportionally
434 * higher cpu capacity. Bogomips are the other way round.
435 * To get to a halfway suitable number we divide 1e7
436 * by the cpu capability number. Yes, that means a floating
437 * point division ..
438 */
439 kernel_fpu_begin(&fpu, KERNEL_FPR);
440 asm volatile(
441 " sfpc %3\n"
442 " l %0,%1\n"
443 " tmlh %0,0xff80\n"
444 " jnz 0f\n"
445 " cefbr %%f2,%0\n"
446 " j 1f\n"
447 "0: le %%f2,%1\n"
448 "1: cefbr %%f0,%2\n"
449 " debr %%f0,%%f2\n"
450 " cgebr %0,5,%%f0\n"
451 : "=&d" (capability)
452 : "Q" (info->capability), "d" (10000000), "d" (0)
453 : "cc"
454 );
455 kernel_fpu_end(&fpu, KERNEL_FPR);
456 } else
457 /*
458 * Really old machine without stsi block for basic
459 * cpu information. Report 42.0 bogomips.
460 */
461 capability = 42;
462 loops_per_jiffy = capability * (500000/HZ);
463 free_page((unsigned long) info);
464 }
465
466 /*
467 * calibrate the delay loop
468 */
calibrate_delay(void)469 void calibrate_delay(void)
470 {
471 s390_adjust_jiffies();
472 /* Print the good old Bogomips line .. */
473 printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
474 "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
475 (loops_per_jiffy/(5000/HZ)) % 100);
476 }
477
478 #ifdef CONFIG_DEBUG_FS
479
480 #define STSI_FILE(fc, s1, s2) \
481 static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
482 { \
483 file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \
484 if (!file->private_data) \
485 return -ENOMEM; \
486 if (stsi(file->private_data, fc, s1, s2)) { \
487 free_page((unsigned long)file->private_data); \
488 file->private_data = NULL; \
489 return -EACCES; \
490 } \
491 return nonseekable_open(inode, file); \
492 } \
493 \
494 static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \
495 .open = stsi_open_##fc##_##s1##_##s2, \
496 .release = stsi_release, \
497 .read = stsi_read, \
498 .llseek = no_llseek, \
499 };
500
stsi_release(struct inode * inode,struct file * file)501 static int stsi_release(struct inode *inode, struct file *file)
502 {
503 free_page((unsigned long)file->private_data);
504 return 0;
505 }
506
stsi_read(struct file * file,char __user * buf,size_t size,loff_t * ppos)507 static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
508 {
509 return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
510 }
511
512 STSI_FILE( 1, 1, 1);
513 STSI_FILE( 1, 2, 1);
514 STSI_FILE( 1, 2, 2);
515 STSI_FILE( 2, 2, 1);
516 STSI_FILE( 2, 2, 2);
517 STSI_FILE( 3, 2, 2);
518 STSI_FILE(15, 1, 2);
519 STSI_FILE(15, 1, 3);
520 STSI_FILE(15, 1, 4);
521 STSI_FILE(15, 1, 5);
522 STSI_FILE(15, 1, 6);
523
524 struct stsi_file {
525 const struct file_operations *fops;
526 char *name;
527 };
528
529 static struct stsi_file stsi_file[] __initdata = {
530 {.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"},
531 {.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"},
532 {.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"},
533 {.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"},
534 {.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"},
535 {.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"},
536 {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
537 {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
538 {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
539 {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
540 {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
541 };
542
543 static u8 stsi_0_0_0;
544
stsi_init_debugfs(void)545 static __init int stsi_init_debugfs(void)
546 {
547 struct dentry *stsi_root;
548 struct stsi_file *sf;
549 int lvl, i;
550
551 stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
552 lvl = stsi(NULL, 0, 0, 0);
553 if (lvl > 0)
554 stsi_0_0_0 = lvl;
555 debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
556 for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
557 sf = &stsi_file[i];
558 debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
559 }
560 if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
561 char link_to[10];
562
563 sprintf(link_to, "15_1_%d", topology_mnest_limit());
564 debugfs_create_symlink("topology", stsi_root, link_to);
565 }
566 return 0;
567 }
568 device_initcall(stsi_init_debugfs);
569
570 #endif /* CONFIG_DEBUG_FS */
571