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/arch/s390/kernel/sysinfo.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 429 lines | 325 code | 54 blank | 50 comment | 46 complexity | 36c6a4af04694fdfef5a19779524b6de MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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
 19/* Sigh, math-emu. Don't ask. */
 20#include <asm/sfp-util.h>
 21#include <math-emu/soft-fp.h>
 22#include <math-emu/single.h>
 23
 24static inline int stsi_0(void)
 25{
 26	int rc = stsi(NULL, 0, 0, 0);
 27	return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
 28}
 29
 30static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
 31{
 32	if (stsi(info, 1, 1, 1) == -ENOSYS)
 33		return len;
 34
 35	EBCASC(info->manufacturer, sizeof(info->manufacturer));
 36	EBCASC(info->type, sizeof(info->type));
 37	EBCASC(info->model, sizeof(info->model));
 38	EBCASC(info->sequence, sizeof(info->sequence));
 39	EBCASC(info->plant, sizeof(info->plant));
 40	EBCASC(info->model_capacity, sizeof(info->model_capacity));
 41	EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
 42	EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
 43	len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
 44		       info->manufacturer);
 45	len += sprintf(page + len, "Type:                 %-4.4s\n",
 46		       info->type);
 47	if (info->model[0] != '\0')
 48		/*
 49		 * Sigh: the model field has been renamed with System z9
 50		 * to model_capacity and a new model field has been added
 51		 * after the plant field. To avoid confusing older programs
 52		 * the "Model:" prints "model_capacity model" or just
 53		 * "model_capacity" if the model string is empty .
 54		 */
 55		len += sprintf(page + len,
 56			       "Model:                %-16.16s %-16.16s\n",
 57			       info->model_capacity, info->model);
 58	else
 59		len += sprintf(page + len, "Model:                %-16.16s\n",
 60			       info->model_capacity);
 61	len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
 62		       info->sequence);
 63	len += sprintf(page + len, "Plant:                %-4.4s\n",
 64		       info->plant);
 65	len += sprintf(page + len, "Model Capacity:       %-16.16s %08u\n",
 66		       info->model_capacity, *(u32 *) info->model_cap_rating);
 67	if (info->model_perm_cap[0] != '\0')
 68		len += sprintf(page + len,
 69			       "Model Perm. Capacity: %-16.16s %08u\n",
 70			       info->model_perm_cap,
 71			       *(u32 *) info->model_perm_cap_rating);
 72	if (info->model_temp_cap[0] != '\0')
 73		len += sprintf(page + len,
 74			       "Model Temp. Capacity: %-16.16s %08u\n",
 75			       info->model_temp_cap,
 76			       *(u32 *) info->model_temp_cap_rating);
 77	return len;
 78}
 79
 80static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
 81{
 82	struct sysinfo_1_2_2_extension *ext;
 83	int i;
 84
 85	if (stsi(info, 1, 2, 2) == -ENOSYS)
 86		return len;
 87	ext = (struct sysinfo_1_2_2_extension *)
 88		((unsigned long) info + info->acc_offset);
 89
 90	len += sprintf(page + len, "\n");
 91	len += sprintf(page + len, "CPUs Total:           %d\n",
 92		       info->cpus_total);
 93	len += sprintf(page + len, "CPUs Configured:      %d\n",
 94		       info->cpus_configured);
 95	len += sprintf(page + len, "CPUs Standby:         %d\n",
 96		       info->cpus_standby);
 97	len += sprintf(page + len, "CPUs Reserved:        %d\n",
 98		       info->cpus_reserved);
 99
100	if (info->format == 1) {
101		/*
102		 * Sigh 2. According to the specification the alternate
103		 * capability field is a 32 bit floating point number
104		 * if the higher order 8 bits are not zero. Printing
105		 * a floating point number in the kernel is a no-no,
106		 * always print the number as 32 bit unsigned integer.
107		 * The user-space needs to know about the strange
108		 * encoding of the alternate cpu capability.
109		 */
110		len += sprintf(page + len, "Capability:           %u %u\n",
111			       info->capability, ext->alt_capability);
112		for (i = 2; i <= info->cpus_total; i++)
113			len += sprintf(page + len,
114				       "Adjustment %02d-way:    %u %u\n",
115				       i, info->adjustment[i-2],
116				       ext->alt_adjustment[i-2]);
117
118	} else {
119		len += sprintf(page + len, "Capability:           %u\n",
120			       info->capability);
121		for (i = 2; i <= info->cpus_total; i++)
122			len += sprintf(page + len,
123				       "Adjustment %02d-way:    %u\n",
124				       i, info->adjustment[i-2]);
125	}
126
127	if (info->secondary_capability != 0)
128		len += sprintf(page + len, "Secondary Capability: %d\n",
129			       info->secondary_capability);
130	return len;
131}
132
133static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
134{
135	if (stsi(info, 2, 2, 2) == -ENOSYS)
136		return len;
137
138	EBCASC(info->name, sizeof(info->name));
139
140	len += sprintf(page + len, "\n");
141	len += sprintf(page + len, "LPAR Number:          %d\n",
142		       info->lpar_number);
143
144	len += sprintf(page + len, "LPAR Characteristics: ");
145	if (info->characteristics & LPAR_CHAR_DEDICATED)
146		len += sprintf(page + len, "Dedicated ");
147	if (info->characteristics & LPAR_CHAR_SHARED)
148		len += sprintf(page + len, "Shared ");
149	if (info->characteristics & LPAR_CHAR_LIMITED)
150		len += sprintf(page + len, "Limited ");
151	len += sprintf(page + len, "\n");
152
153	len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
154		       info->name);
155
156	len += sprintf(page + len, "LPAR Adjustment:      %d\n",
157		       info->caf);
158
159	len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
160		       info->cpus_total);
161	len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
162		       info->cpus_configured);
163	len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
164		       info->cpus_standby);
165	len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
166		       info->cpus_reserved);
167	len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
168		       info->cpus_dedicated);
169	len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
170		       info->cpus_shared);
171	return len;
172}
173
174static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
175{
176	int i;
177
178	if (stsi(info, 3, 2, 2) == -ENOSYS)
179		return len;
180	for (i = 0; i < info->count; i++) {
181		EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
182		EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
183		len += sprintf(page + len, "\n");
184		len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
185			       i, info->vm[i].name);
186		len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
187			       i, info->vm[i].cpi);
188
189		len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
190			       i, info->vm[i].caf);
191
192		len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
193			       i, info->vm[i].cpus_total);
194		len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
195			       i, info->vm[i].cpus_configured);
196		len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
197			       i, info->vm[i].cpus_standby);
198		len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
199			       i, info->vm[i].cpus_reserved);
200	}
201	return len;
202}
203
204static int proc_read_sysinfo(char *page, char **start,
205			     off_t off, int count,
206			     int *eof, void *data)
207{
208	unsigned long info = get_zeroed_page(GFP_KERNEL);
209	int level, len;
210
211	if (!info)
212		return 0;
213
214	len = 0;
215	level = stsi_0();
216	if (level >= 1)
217		len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
218
219	if (level >= 1)
220		len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
221
222	if (level >= 2)
223		len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
224
225	if (level >= 3)
226		len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
227
228	free_page(info);
229	return len;
230}
231
232static __init int create_proc_sysinfo(void)
233{
234	create_proc_read_entry("sysinfo", 0444, NULL,
235			       proc_read_sysinfo, NULL);
236	return 0;
237}
238device_initcall(create_proc_sysinfo);
239
240/*
241 * Service levels interface.
242 */
243
244static DECLARE_RWSEM(service_level_sem);
245static LIST_HEAD(service_level_list);
246
247int register_service_level(struct service_level *slr)
248{
249	struct service_level *ptr;
250
251	down_write(&service_level_sem);
252	list_for_each_entry(ptr, &service_level_list, list)
253		if (ptr == slr) {
254			up_write(&service_level_sem);
255			return -EEXIST;
256		}
257	list_add_tail(&slr->list, &service_level_list);
258	up_write(&service_level_sem);
259	return 0;
260}
261EXPORT_SYMBOL(register_service_level);
262
263int unregister_service_level(struct service_level *slr)
264{
265	struct service_level *ptr, *next;
266	int rc = -ENOENT;
267
268	down_write(&service_level_sem);
269	list_for_each_entry_safe(ptr, next, &service_level_list, list) {
270		if (ptr != slr)
271			continue;
272		list_del(&ptr->list);
273		rc = 0;
274		break;
275	}
276	up_write(&service_level_sem);
277	return rc;
278}
279EXPORT_SYMBOL(unregister_service_level);
280
281static void *service_level_start(struct seq_file *m, loff_t *pos)
282{
283	down_read(&service_level_sem);
284	return seq_list_start(&service_level_list, *pos);
285}
286
287static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
288{
289	return seq_list_next(p, &service_level_list, pos);
290}
291
292static void service_level_stop(struct seq_file *m, void *p)
293{
294	up_read(&service_level_sem);
295}
296
297static int service_level_show(struct seq_file *m, void *p)
298{
299	struct service_level *slr;
300
301	slr = list_entry(p, struct service_level, list);
302	slr->seq_print(m, slr);
303	return 0;
304}
305
306static const struct seq_operations service_level_seq_ops = {
307	.start		= service_level_start,
308	.next		= service_level_next,
309	.stop		= service_level_stop,
310	.show		= service_level_show
311};
312
313static int service_level_open(struct inode *inode, struct file *file)
314{
315	return seq_open(file, &service_level_seq_ops);
316}
317
318static const struct file_operations service_level_ops = {
319	.open		= service_level_open,
320	.read		= seq_read,
321	.llseek 	= seq_lseek,
322	.release	= seq_release
323};
324
325static void service_level_vm_print(struct seq_file *m,
326				   struct service_level *slr)
327{
328	char *query_buffer, *str;
329
330	query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
331	if (!query_buffer)
332		return;
333	cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
334	str = strchr(query_buffer, '\n');
335	if (str)
336		*str = 0;
337	seq_printf(m, "VM: %s\n", query_buffer);
338	kfree(query_buffer);
339}
340
341static struct service_level service_level_vm = {
342	.seq_print = service_level_vm_print
343};
344
345static __init int create_proc_service_level(void)
346{
347	proc_create("service_levels", 0, NULL, &service_level_ops);
348	if (MACHINE_IS_VM)
349		register_service_level(&service_level_vm);
350	return 0;
351}
352subsys_initcall(create_proc_service_level);
353
354/*
355 * Bogomips calculation based on cpu capability.
356 */
357int get_cpu_capability(unsigned int *capability)
358{
359	struct sysinfo_1_2_2 *info;
360	int rc;
361
362	info = (void *) get_zeroed_page(GFP_KERNEL);
363	if (!info)
364		return -ENOMEM;
365	rc = stsi(info, 1, 2, 2);
366	if (rc == -ENOSYS)
367		goto out;
368	rc = 0;
369	*capability = info->capability;
370out:
371	free_page((unsigned long) info);
372	return rc;
373}
374
375/*
376 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
377 */
378void s390_adjust_jiffies(void)
379{
380	struct sysinfo_1_2_2 *info;
381	const unsigned int fmil = 0x4b189680;	/* 1e7 as 32-bit float. */
382	FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
383	FP_DECL_EX;
384	unsigned int capability;
385
386	info = (void *) get_zeroed_page(GFP_KERNEL);
387	if (!info)
388		return;
389
390	if (stsi(info, 1, 2, 2) != -ENOSYS) {
391		/*
392		 * Major sigh. The cpu capability encoding is "special".
393		 * If the first 9 bits of info->capability are 0 then it
394		 * is a 32 bit unsigned integer in the range 0 .. 2^23.
395		 * If the first 9 bits are != 0 then it is a 32 bit float.
396		 * In addition a lower value indicates a proportionally
397		 * higher cpu capacity. Bogomips are the other way round.
398		 * To get to a halfway suitable number we divide 1e7
399		 * by the cpu capability number. Yes, that means a floating
400		 * point division .. math-emu here we come :-)
401		 */
402		FP_UNPACK_SP(SA, &fmil);
403		if ((info->capability >> 23) == 0)
404			FP_FROM_INT_S(SB, info->capability, 32, int);
405		else
406			FP_UNPACK_SP(SB, &info->capability);
407		FP_DIV_S(SR, SA, SB);
408		FP_TO_INT_S(capability, SR, 32, 0);
409	} else
410		/*
411		 * Really old machine without stsi block for basic
412		 * cpu information. Report 42.0 bogomips.
413		 */
414		capability = 42;
415	loops_per_jiffy = capability * (500000/HZ);
416	free_page((unsigned long) info);
417}
418
419/*
420 * calibrate the delay loop
421 */
422void __cpuinit calibrate_delay(void)
423{
424	s390_adjust_jiffies();
425	/* Print the good old Bogomips line .. */
426	printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
427	       "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
428	       (loops_per_jiffy/(5000/HZ)) % 100);
429}