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1 /*
2  *  Copyright IBM Corp. 2001, 2009
3  *  Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
4  *	       Martin Schwidefsky <schwidefsky@de.ibm.com>,
5  */
6 
7 #include <linux/kernel.h>
8 #include <linux/mm.h>
9 #include <linux/proc_fs.h>
10 #include <linux/seq_file.h>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <asm/ebcdic.h>
16 #include <asm/sysinfo.h>
17 #include <asm/cpcmd.h>
18 #include <asm/topology.h>
19 
20 /* Sigh, math-emu. Don't ask. */
21 #include <asm/sfp-util.h>
22 #include <math-emu/soft-fp.h>
23 #include <math-emu/single.h>
24 
25 int topology_max_mnest;
26 
27 /*
28  * stsi - store system information
29  *
30  * Returns the current configuration level if function code 0 was specified.
31  * Otherwise returns 0 on success or a negative value on error.
32  */
stsi(void * sysinfo,int fc,int sel1,int sel2)33 int stsi(void *sysinfo, int fc, int sel1, int sel2)
34 {
35 	register int r0 asm("0") = (fc << 28) | sel1;
36 	register int r1 asm("1") = sel2;
37 	int rc = 0;
38 
39 	asm volatile(
40 		"	stsi	0(%3)\n"
41 		"0:	jz	2f\n"
42 		"1:	lhi	%1,%4\n"
43 		"2:\n"
44 		EX_TABLE(0b, 1b)
45 		: "+d" (r0), "+d" (rc)
46 		: "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
47 		: "cc", "memory");
48 	if (rc)
49 		return rc;
50 	return fc ? 0 : ((unsigned int) r0) >> 28;
51 }
52 EXPORT_SYMBOL(stsi);
53 
stsi_1_1_1(struct seq_file * m,struct sysinfo_1_1_1 * info)54 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
55 {
56 	int i;
57 
58 	if (stsi(info, 1, 1, 1))
59 		return;
60 	EBCASC(info->manufacturer, sizeof(info->manufacturer));
61 	EBCASC(info->type, sizeof(info->type));
62 	EBCASC(info->model, sizeof(info->model));
63 	EBCASC(info->sequence, sizeof(info->sequence));
64 	EBCASC(info->plant, sizeof(info->plant));
65 	EBCASC(info->model_capacity, sizeof(info->model_capacity));
66 	EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
67 	EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
68 	seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
69 	seq_printf(m, "Type:                 %-4.4s\n", info->type);
70 	/*
71 	 * Sigh: the model field has been renamed with System z9
72 	 * to model_capacity and a new model field has been added
73 	 * after the plant field. To avoid confusing older programs
74 	 * the "Model:" prints "model_capacity model" or just
75 	 * "model_capacity" if the model string is empty .
76 	 */
77 	seq_printf(m, "Model:                %-16.16s", info->model_capacity);
78 	if (info->model[0] != '\0')
79 		seq_printf(m, " %-16.16s", info->model);
80 	seq_putc(m, '\n');
81 	seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
82 	seq_printf(m, "Plant:                %-4.4s\n", info->plant);
83 	seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
84 		   info->model_capacity, info->model_cap_rating);
85 	if (info->model_perm_cap_rating)
86 		seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
87 			   info->model_perm_cap,
88 			   info->model_perm_cap_rating);
89 	if (info->model_temp_cap_rating)
90 		seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
91 			   info->model_temp_cap,
92 			   info->model_temp_cap_rating);
93 	if (info->ncr)
94 		seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
95 	if (info->npr)
96 		seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
97 	if (info->ntr)
98 		seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
99 	if (info->cai) {
100 		seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
101 		seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
102 		seq_printf(m, "Capacity Transient:   %d\n", info->t);
103 	}
104 	if (info->p) {
105 		for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
106 			seq_printf(m, "Type %d Percentage:    %d\n",
107 				   i, info->typepct[i - 1]);
108 		}
109 	}
110 }
111 
stsi_15_1_x(struct seq_file * m,struct sysinfo_15_1_x * info)112 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
113 {
114 	static int max_mnest;
115 	int i, rc;
116 
117 	seq_putc(m, '\n');
118 	if (!MACHINE_HAS_TOPOLOGY)
119 		return;
120 	if (stsi(info, 15, 1, topology_max_mnest))
121 		return;
122 	seq_printf(m, "CPU Topology HW:     ");
123 	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
124 		seq_printf(m, " %d", info->mag[i]);
125 	seq_putc(m, '\n');
126 #ifdef CONFIG_SCHED_MC
127 	store_topology(info);
128 	seq_printf(m, "CPU Topology SW:     ");
129 	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
130 		seq_printf(m, " %d", info->mag[i]);
131 	seq_putc(m, '\n');
132 #endif
133 }
134 
stsi_1_2_2(struct seq_file * m,struct sysinfo_1_2_2 * info)135 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
136 {
137 	struct sysinfo_1_2_2_extension *ext;
138 	int i;
139 
140 	if (stsi(info, 1, 2, 2))
141 		return;
142 	ext = (struct sysinfo_1_2_2_extension *)
143 		((unsigned long) info + info->acc_offset);
144 	seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
145 	seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
146 	seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
147 	seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
148 	/*
149 	 * Sigh 2. According to the specification the alternate
150 	 * capability field is a 32 bit floating point number
151 	 * if the higher order 8 bits are not zero. Printing
152 	 * a floating point number in the kernel is a no-no,
153 	 * always print the number as 32 bit unsigned integer.
154 	 * The user-space needs to know about the strange
155 	 * encoding of the alternate cpu capability.
156 	 */
157 	seq_printf(m, "Capability:           %u", info->capability);
158 	if (info->format == 1)
159 		seq_printf(m, " %u", ext->alt_capability);
160 	seq_putc(m, '\n');
161 	if (info->nominal_cap)
162 		seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
163 	if (info->secondary_cap)
164 		seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
165 	for (i = 2; i <= info->cpus_total; i++) {
166 		seq_printf(m, "Adjustment %02d-way:    %u",
167 			   i, info->adjustment[i-2]);
168 		if (info->format == 1)
169 			seq_printf(m, " %u", ext->alt_adjustment[i-2]);
170 		seq_putc(m, '\n');
171 	}
172 }
173 
stsi_2_2_2(struct seq_file * m,struct sysinfo_2_2_2 * info)174 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
175 {
176 	if (stsi(info, 2, 2, 2))
177 		return;
178 	EBCASC(info->name, sizeof(info->name));
179 	seq_putc(m, '\n');
180 	seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
181 	seq_printf(m, "LPAR Characteristics: ");
182 	if (info->characteristics & LPAR_CHAR_DEDICATED)
183 		seq_printf(m, "Dedicated ");
184 	if (info->characteristics & LPAR_CHAR_SHARED)
185 		seq_printf(m, "Shared ");
186 	if (info->characteristics & LPAR_CHAR_LIMITED)
187 		seq_printf(m, "Limited ");
188 	seq_putc(m, '\n');
189 	seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
190 	seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
191 	seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
192 	seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
193 	seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
194 	seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
195 	seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
196 	seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
197 	if (info->mt_installed & 0x80) {
198 		seq_printf(m, "LPAR CPUs G-MTID:     %d\n",
199 			   info->mt_general & 0x1f);
200 		seq_printf(m, "LPAR CPUs S-MTID:     %d\n",
201 			   info->mt_installed & 0x1f);
202 		seq_printf(m, "LPAR CPUs PS-MTID:    %d\n",
203 			   info->mt_psmtid & 0x1f);
204 	}
205 }
206 
print_ext_name(struct seq_file * m,int lvl,struct sysinfo_3_2_2 * info)207 static void print_ext_name(struct seq_file *m, int lvl,
208 			   struct sysinfo_3_2_2 *info)
209 {
210 	if (info->vm[lvl].ext_name_encoding == 0)
211 		return;
212 	if (info->ext_names[lvl][0] == 0)
213 		return;
214 	switch (info->vm[lvl].ext_name_encoding) {
215 	case 1: /* EBCDIC */
216 		EBCASC(info->ext_names[lvl], sizeof(info->ext_names[lvl]));
217 		break;
218 	case 2:	/* UTF-8 */
219 		break;
220 	default:
221 		return;
222 	}
223 	seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
224 		   info->ext_names[lvl]);
225 }
226 
print_uuid(struct seq_file * m,int i,struct sysinfo_3_2_2 * info)227 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
228 {
229 	if (!memcmp(&info->vm[i].uuid, &NULL_UUID_BE, sizeof(uuid_be)))
230 		return;
231 	seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
232 }
233 
stsi_3_2_2(struct seq_file * m,struct sysinfo_3_2_2 * info)234 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
235 {
236 	int i;
237 
238 	if (stsi(info, 3, 2, 2))
239 		return;
240 	for (i = 0; i < info->count; i++) {
241 		EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
242 		EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
243 		seq_putc(m, '\n');
244 		seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
245 		seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
246 		seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
247 		seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
248 		seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
249 		seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
250 		seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
251 		print_ext_name(m, i, info);
252 		print_uuid(m, i, info);
253 	}
254 }
255 
sysinfo_show(struct seq_file * m,void * v)256 static int sysinfo_show(struct seq_file *m, void *v)
257 {
258 	void *info = (void *)get_zeroed_page(GFP_KERNEL);
259 	int level;
260 
261 	if (!info)
262 		return 0;
263 	level = stsi(NULL, 0, 0, 0);
264 	if (level >= 1)
265 		stsi_1_1_1(m, info);
266 	if (level >= 1)
267 		stsi_15_1_x(m, info);
268 	if (level >= 1)
269 		stsi_1_2_2(m, info);
270 	if (level >= 2)
271 		stsi_2_2_2(m, info);
272 	if (level >= 3)
273 		stsi_3_2_2(m, info);
274 	free_page((unsigned long)info);
275 	return 0;
276 }
277 
sysinfo_open(struct inode * inode,struct file * file)278 static int sysinfo_open(struct inode *inode, struct file *file)
279 {
280 	return single_open(file, sysinfo_show, NULL);
281 }
282 
283 static const struct file_operations sysinfo_fops = {
284 	.open		= sysinfo_open,
285 	.read		= seq_read,
286 	.llseek		= seq_lseek,
287 	.release	= single_release,
288 };
289 
sysinfo_create_proc(void)290 static int __init sysinfo_create_proc(void)
291 {
292 	proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
293 	return 0;
294 }
295 device_initcall(sysinfo_create_proc);
296 
297 /*
298  * Service levels interface.
299  */
300 
301 static DECLARE_RWSEM(service_level_sem);
302 static LIST_HEAD(service_level_list);
303 
register_service_level(struct service_level * slr)304 int register_service_level(struct service_level *slr)
305 {
306 	struct service_level *ptr;
307 
308 	down_write(&service_level_sem);
309 	list_for_each_entry(ptr, &service_level_list, list)
310 		if (ptr == slr) {
311 			up_write(&service_level_sem);
312 			return -EEXIST;
313 		}
314 	list_add_tail(&slr->list, &service_level_list);
315 	up_write(&service_level_sem);
316 	return 0;
317 }
318 EXPORT_SYMBOL(register_service_level);
319 
unregister_service_level(struct service_level * slr)320 int unregister_service_level(struct service_level *slr)
321 {
322 	struct service_level *ptr, *next;
323 	int rc = -ENOENT;
324 
325 	down_write(&service_level_sem);
326 	list_for_each_entry_safe(ptr, next, &service_level_list, list) {
327 		if (ptr != slr)
328 			continue;
329 		list_del(&ptr->list);
330 		rc = 0;
331 		break;
332 	}
333 	up_write(&service_level_sem);
334 	return rc;
335 }
336 EXPORT_SYMBOL(unregister_service_level);
337 
service_level_start(struct seq_file * m,loff_t * pos)338 static void *service_level_start(struct seq_file *m, loff_t *pos)
339 {
340 	down_read(&service_level_sem);
341 	return seq_list_start(&service_level_list, *pos);
342 }
343 
service_level_next(struct seq_file * m,void * p,loff_t * pos)344 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
345 {
346 	return seq_list_next(p, &service_level_list, pos);
347 }
348 
service_level_stop(struct seq_file * m,void * p)349 static void service_level_stop(struct seq_file *m, void *p)
350 {
351 	up_read(&service_level_sem);
352 }
353 
service_level_show(struct seq_file * m,void * p)354 static int service_level_show(struct seq_file *m, void *p)
355 {
356 	struct service_level *slr;
357 
358 	slr = list_entry(p, struct service_level, list);
359 	slr->seq_print(m, slr);
360 	return 0;
361 }
362 
363 static const struct seq_operations service_level_seq_ops = {
364 	.start		= service_level_start,
365 	.next		= service_level_next,
366 	.stop		= service_level_stop,
367 	.show		= service_level_show
368 };
369 
service_level_open(struct inode * inode,struct file * file)370 static int service_level_open(struct inode *inode, struct file *file)
371 {
372 	return seq_open(file, &service_level_seq_ops);
373 }
374 
375 static const struct file_operations service_level_ops = {
376 	.open		= service_level_open,
377 	.read		= seq_read,
378 	.llseek 	= seq_lseek,
379 	.release	= seq_release
380 };
381 
service_level_vm_print(struct seq_file * m,struct service_level * slr)382 static void service_level_vm_print(struct seq_file *m,
383 				   struct service_level *slr)
384 {
385 	char *query_buffer, *str;
386 
387 	query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
388 	if (!query_buffer)
389 		return;
390 	cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
391 	str = strchr(query_buffer, '\n');
392 	if (str)
393 		*str = 0;
394 	seq_printf(m, "VM: %s\n", query_buffer);
395 	kfree(query_buffer);
396 }
397 
398 static struct service_level service_level_vm = {
399 	.seq_print = service_level_vm_print
400 };
401 
create_proc_service_level(void)402 static __init int create_proc_service_level(void)
403 {
404 	proc_create("service_levels", 0, NULL, &service_level_ops);
405 	if (MACHINE_IS_VM)
406 		register_service_level(&service_level_vm);
407 	return 0;
408 }
409 subsys_initcall(create_proc_service_level);
410 
411 /*
412  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
413  */
s390_adjust_jiffies(void)414 void s390_adjust_jiffies(void)
415 {
416 	struct sysinfo_1_2_2 *info;
417 	const unsigned int fmil = 0x4b189680;	/* 1e7 as 32-bit float. */
418 	FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
419 	FP_DECL_EX;
420 	unsigned int capability;
421 
422 	info = (void *) get_zeroed_page(GFP_KERNEL);
423 	if (!info)
424 		return;
425 
426 	if (stsi(info, 1, 2, 2) == 0) {
427 		/*
428 		 * Major sigh. The cpu capability encoding is "special".
429 		 * If the first 9 bits of info->capability are 0 then it
430 		 * is a 32 bit unsigned integer in the range 0 .. 2^23.
431 		 * If the first 9 bits are != 0 then it is a 32 bit float.
432 		 * In addition a lower value indicates a proportionally
433 		 * higher cpu capacity. Bogomips are the other way round.
434 		 * To get to a halfway suitable number we divide 1e7
435 		 * by the cpu capability number. Yes, that means a floating
436 		 * point division .. math-emu here we come :-)
437 		 */
438 		FP_UNPACK_SP(SA, &fmil);
439 		if ((info->capability >> 23) == 0)
440 			FP_FROM_INT_S(SB, (long) info->capability, 64, long);
441 		else
442 			FP_UNPACK_SP(SB, &info->capability);
443 		FP_DIV_S(SR, SA, SB);
444 		FP_TO_INT_S(capability, SR, 32, 0);
445 	} else
446 		/*
447 		 * Really old machine without stsi block for basic
448 		 * cpu information. Report 42.0 bogomips.
449 		 */
450 		capability = 42;
451 	loops_per_jiffy = capability * (500000/HZ);
452 	free_page((unsigned long) info);
453 }
454 
455 /*
456  * calibrate the delay loop
457  */
calibrate_delay(void)458 void calibrate_delay(void)
459 {
460 	s390_adjust_jiffies();
461 	/* Print the good old Bogomips line .. */
462 	printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
463 	       "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
464 	       (loops_per_jiffy/(5000/HZ)) % 100);
465 }
466