xref: /openbmc/linux/arch/s390/kernel/sysinfo.c (revision d09a307f)
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