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}
198
199static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
200{
201	int i;
202
203	if (stsi(info, 3, 2, 2))
204		return;
205	for (i = 0; i < info->count; i++) {
206		EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
207		EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
208		seq_putc(m, '\n');
209		seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
210		seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
211		seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
212		seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
213		seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
214		seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
215		seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
216	}
217}
218
219static int sysinfo_show(struct seq_file *m, void *v)
220{
221	void *info = (void *)get_zeroed_page(GFP_KERNEL);
222	int level;
223
224	if (!info)
225		return 0;
226	level = stsi(NULL, 0, 0, 0);
227	if (level >= 1)
228		stsi_1_1_1(m, info);
229	if (level >= 1)
230		stsi_15_1_x(m, info);
231	if (level >= 1)
232		stsi_1_2_2(m, info);
233	if (level >= 2)
234		stsi_2_2_2(m, info);
235	if (level >= 3)
236		stsi_3_2_2(m, info);
237	free_page((unsigned long)info);
238	return 0;
239}
240
241static int sysinfo_open(struct inode *inode, struct file *file)
242{
243	return single_open(file, sysinfo_show, NULL);
244}
245
246static const struct file_operations sysinfo_fops = {
247	.open		= sysinfo_open,
248	.read		= seq_read,
249	.llseek		= seq_lseek,
250	.release	= single_release,
251};
252
253static int __init sysinfo_create_proc(void)
254{
255	proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
256	return 0;
257}
258device_initcall(sysinfo_create_proc);
259
260/*
261 * Service levels interface.
262 */
263
264static DECLARE_RWSEM(service_level_sem);
265static LIST_HEAD(service_level_list);
266
267int register_service_level(struct service_level *slr)
268{
269	struct service_level *ptr;
270
271	down_write(&service_level_sem);
272	list_for_each_entry(ptr, &service_level_list, list)
273		if (ptr == slr) {
274			up_write(&service_level_sem);
275			return -EEXIST;
276		}
277	list_add_tail(&slr->list, &service_level_list);
278	up_write(&service_level_sem);
279	return 0;
280}
281EXPORT_SYMBOL(register_service_level);
282
283int unregister_service_level(struct service_level *slr)
284{
285	struct service_level *ptr, *next;
286	int rc = -ENOENT;
287
288	down_write(&service_level_sem);
289	list_for_each_entry_safe(ptr, next, &service_level_list, list) {
290		if (ptr != slr)
291			continue;
292		list_del(&ptr->list);
293		rc = 0;
294		break;
295	}
296	up_write(&service_level_sem);
297	return rc;
298}
299EXPORT_SYMBOL(unregister_service_level);
300
301static void *service_level_start(struct seq_file *m, loff_t *pos)
302{
303	down_read(&service_level_sem);
304	return seq_list_start(&service_level_list, *pos);
305}
306
307static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
308{
309	return seq_list_next(p, &service_level_list, pos);
310}
311
312static void service_level_stop(struct seq_file *m, void *p)
313{
314	up_read(&service_level_sem);
315}
316
317static int service_level_show(struct seq_file *m, void *p)
318{
319	struct service_level *slr;
320
321	slr = list_entry(p, struct service_level, list);
322	slr->seq_print(m, slr);
323	return 0;
324}
325
326static const struct seq_operations service_level_seq_ops = {
327	.start		= service_level_start,
328	.next		= service_level_next,
329	.stop		= service_level_stop,
330	.show		= service_level_show
331};
332
333static int service_level_open(struct inode *inode, struct file *file)
334{
335	return seq_open(file, &service_level_seq_ops);
336}
337
338static const struct file_operations service_level_ops = {
339	.open		= service_level_open,
340	.read		= seq_read,
341	.llseek 	= seq_lseek,
342	.release	= seq_release
343};
344
345static void service_level_vm_print(struct seq_file *m,
346				   struct service_level *slr)
347{
348	char *query_buffer, *str;
349
350	query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
351	if (!query_buffer)
352		return;
353	cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
354	str = strchr(query_buffer, '\n');
355	if (str)
356		*str = 0;
357	seq_printf(m, "VM: %s\n", query_buffer);
358	kfree(query_buffer);
359}
360
361static struct service_level service_level_vm = {
362	.seq_print = service_level_vm_print
363};
364
365static __init int create_proc_service_level(void)
366{
367	proc_create("service_levels", 0, NULL, &service_level_ops);
368	if (MACHINE_IS_VM)
369		register_service_level(&service_level_vm);
370	return 0;
371}
372subsys_initcall(create_proc_service_level);
373
374/*
375 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
376 */
377void s390_adjust_jiffies(void)
378{
379	struct sysinfo_1_2_2 *info;
380	const unsigned int fmil = 0x4b189680;	/* 1e7 as 32-bit float. */
381	FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
382	FP_DECL_EX;
383	unsigned int capability;
384
385	info = (void *) get_zeroed_page(GFP_KERNEL);
386	if (!info)
387		return;
388
389	if (stsi(info, 1, 2, 2) == 0) {
390		/*
391		 * Major sigh. The cpu capability encoding is "special".
392		 * If the first 9 bits of info->capability are 0 then it
393		 * is a 32 bit unsigned integer in the range 0 .. 2^23.
394		 * If the first 9 bits are != 0 then it is a 32 bit float.
395		 * In addition a lower value indicates a proportionally
396		 * higher cpu capacity. Bogomips are the other way round.
397		 * To get to a halfway suitable number we divide 1e7
398		 * by the cpu capability number. Yes, that means a floating
399		 * point division .. math-emu here we come :-)
400		 */
401		FP_UNPACK_SP(SA, &fmil);
402		if ((info->capability >> 23) == 0)
403			FP_FROM_INT_S(SB, (long) info->capability, 64, long);
404		else
405			FP_UNPACK_SP(SB, &info->capability);
406		FP_DIV_S(SR, SA, SB);
407		FP_TO_INT_S(capability, SR, 32, 0);
408	} else
409		/*
410		 * Really old machine without stsi block for basic
411		 * cpu information. Report 42.0 bogomips.
412		 */
413		capability = 42;
414	loops_per_jiffy = capability * (500000/HZ);
415	free_page((unsigned long) info);
416}
417
418/*
419 * calibrate the delay loop
420 */
421void calibrate_delay(void)
422{
423	s390_adjust_jiffies();
424	/* Print the good old Bogomips line .. */
425	printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
426	       "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
427	       (loops_per_jiffy/(5000/HZ)) % 100);
428}
429