xref: /openbmc/linux/arch/s390/kernel/sysinfo.c (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
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