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
25int 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 */
33int 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}
52EXPORT_SYMBOL(stsi);
53
54static 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
112static 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
135static 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
174static 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
207static 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
227static 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
234static 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
256static 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
278static int sysinfo_open(struct inode *inode, struct file *file)
279{
280	return single_open(file, sysinfo_show, NULL);
281}
282
283static const struct file_operations sysinfo_fops = {
284	.open		= sysinfo_open,
285	.read		= seq_read,
286	.llseek		= seq_lseek,
287	.release	= single_release,
288};
289
290static int __init sysinfo_create_proc(void)
291{
292	proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
293	return 0;
294}
295device_initcall(sysinfo_create_proc);
296
297/*
298 * Service levels interface.
299 */
300
301static DECLARE_RWSEM(service_level_sem);
302static LIST_HEAD(service_level_list);
303
304int 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}
318EXPORT_SYMBOL(register_service_level);
319
320int 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}
336EXPORT_SYMBOL(unregister_service_level);
337
338static 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
344static 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
349static void service_level_stop(struct seq_file *m, void *p)
350{
351	up_read(&service_level_sem);
352}
353
354static 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
363static 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
370static int service_level_open(struct inode *inode, struct file *file)
371{
372	return seq_open(file, &service_level_seq_ops);
373}
374
375static 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
382static 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
398static struct service_level service_level_vm = {
399	.seq_print = service_level_vm_print
400};
401
402static __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}
409subsys_initcall(create_proc_service_level);
410
411/*
412 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
413 */
414void 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 */
458void 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