GNU Linux-libre 4.9.288-gnu1
[releases.git] / arch / s390 / kernel / sysinfo.c
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 #include <asm/fpu/api.h>
20
21 int topology_max_mnest;
22
23 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
24 {
25         register int r0 asm("0") = (fc << 28) | sel1;
26         register int r1 asm("1") = sel2;
27         int rc = 0;
28
29         asm volatile(
30                 "       stsi    0(%3)\n"
31                 "0:     jz      2f\n"
32                 "1:     lhi     %1,%4\n"
33                 "2:\n"
34                 EX_TABLE(0b, 1b)
35                 : "+d" (r0), "+d" (rc)
36                 : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
37                 : "cc", "memory");
38         *lvl = ((unsigned int) r0) >> 28;
39         return rc;
40 }
41
42 /*
43  * stsi - store system information
44  *
45  * Returns the current configuration level if function code 0 was specified.
46  * Otherwise returns 0 on success or a negative value on error.
47  */
48 int stsi(void *sysinfo, int fc, int sel1, int sel2)
49 {
50         int lvl, rc;
51
52         rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
53         if (rc)
54                 return rc;
55         return fc ? 0 : lvl;
56 }
57 EXPORT_SYMBOL(stsi);
58
59 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
60 {
61         int i;
62
63         if (stsi(info, 1, 1, 1))
64                 return;
65         EBCASC(info->manufacturer, sizeof(info->manufacturer));
66         EBCASC(info->type, sizeof(info->type));
67         EBCASC(info->model, sizeof(info->model));
68         EBCASC(info->sequence, sizeof(info->sequence));
69         EBCASC(info->plant, sizeof(info->plant));
70         EBCASC(info->model_capacity, sizeof(info->model_capacity));
71         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
72         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
73         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
74         seq_printf(m, "Type:                 %-4.4s\n", info->type);
75         /*
76          * Sigh: the model field has been renamed with System z9
77          * to model_capacity and a new model field has been added
78          * after the plant field. To avoid confusing older programs
79          * the "Model:" prints "model_capacity model" or just
80          * "model_capacity" if the model string is empty .
81          */
82         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
83         if (info->model[0] != '\0')
84                 seq_printf(m, " %-16.16s", info->model);
85         seq_putc(m, '\n');
86         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
87         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
88         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
89                    info->model_capacity, info->model_cap_rating);
90         if (info->model_perm_cap_rating)
91                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
92                            info->model_perm_cap,
93                            info->model_perm_cap_rating);
94         if (info->model_temp_cap_rating)
95                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
96                            info->model_temp_cap,
97                            info->model_temp_cap_rating);
98         if (info->ncr)
99                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
100         if (info->npr)
101                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
102         if (info->ntr)
103                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
104         if (info->cai) {
105                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
106                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
107                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
108         }
109         if (info->p) {
110                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
111                         seq_printf(m, "Type %d Percentage:    %d\n",
112                                    i, info->typepct[i - 1]);
113                 }
114         }
115 }
116
117 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
118 {
119         int i;
120
121         seq_putc(m, '\n');
122         if (!MACHINE_HAS_TOPOLOGY)
123                 return;
124         if (stsi(info, 15, 1, topology_max_mnest))
125                 return;
126         seq_printf(m, "CPU Topology HW:     ");
127         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
128                 seq_printf(m, " %d", info->mag[i]);
129         seq_putc(m, '\n');
130 #ifdef CONFIG_SCHED_TOPOLOGY
131         store_topology(info);
132         seq_printf(m, "CPU Topology SW:     ");
133         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
134                 seq_printf(m, " %d", info->mag[i]);
135         seq_putc(m, '\n');
136 #endif
137 }
138
139 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
140 {
141         struct sysinfo_1_2_2_extension *ext;
142         int i;
143
144         if (stsi(info, 1, 2, 2))
145                 return;
146         ext = (struct sysinfo_1_2_2_extension *)
147                 ((unsigned long) info + info->acc_offset);
148         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
149         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
150         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
151         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
152         if (info->mt_installed) {
153                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
154                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
155         }
156         /*
157          * Sigh 2. According to the specification the alternate
158          * capability field is a 32 bit floating point number
159          * if the higher order 8 bits are not zero. Printing
160          * a floating point number in the kernel is a no-no,
161          * always print the number as 32 bit unsigned integer.
162          * The user-space needs to know about the strange
163          * encoding of the alternate cpu capability.
164          */
165         seq_printf(m, "Capability:           %u", info->capability);
166         if (info->format == 1)
167                 seq_printf(m, " %u", ext->alt_capability);
168         seq_putc(m, '\n');
169         if (info->nominal_cap)
170                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
171         if (info->secondary_cap)
172                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
173         for (i = 2; i <= info->cpus_total; i++) {
174                 seq_printf(m, "Adjustment %02d-way:    %u",
175                            i, info->adjustment[i-2]);
176                 if (info->format == 1)
177                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
178                 seq_putc(m, '\n');
179         }
180 }
181
182 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
183 {
184         if (stsi(info, 2, 2, 2))
185                 return;
186         EBCASC(info->name, sizeof(info->name));
187         seq_putc(m, '\n');
188         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
189         seq_printf(m, "LPAR Characteristics: ");
190         if (info->characteristics & LPAR_CHAR_DEDICATED)
191                 seq_printf(m, "Dedicated ");
192         if (info->characteristics & LPAR_CHAR_SHARED)
193                 seq_printf(m, "Shared ");
194         if (info->characteristics & LPAR_CHAR_LIMITED)
195                 seq_printf(m, "Limited ");
196         seq_putc(m, '\n');
197         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
198         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
199         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
200         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
201         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
202         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
203         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
204         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
205         if (info->mt_installed) {
206                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
207                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
208                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
209         }
210 }
211
212 static void print_ext_name(struct seq_file *m, int lvl,
213                            struct sysinfo_3_2_2 *info)
214 {
215         if (info->vm[lvl].ext_name_encoding == 0)
216                 return;
217         if (info->ext_names[lvl][0] == 0)
218                 return;
219         switch (info->vm[lvl].ext_name_encoding) {
220         case 1: /* EBCDIC */
221                 EBCASC(info->ext_names[lvl], sizeof(info->ext_names[lvl]));
222                 break;
223         case 2: /* UTF-8 */
224                 break;
225         default:
226                 return;
227         }
228         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
229                    info->ext_names[lvl]);
230 }
231
232 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
233 {
234         if (!memcmp(&info->vm[i].uuid, &NULL_UUID_BE, sizeof(uuid_be)))
235                 return;
236         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
237 }
238
239 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
240 {
241         int i;
242
243         if (stsi(info, 3, 2, 2))
244                 return;
245         for (i = 0; i < info->count; i++) {
246                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
247                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
248                 seq_putc(m, '\n');
249                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
250                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
251                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
252                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
253                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
254                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
255                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
256                 print_ext_name(m, i, info);
257                 print_uuid(m, i, info);
258         }
259 }
260
261 static int sysinfo_show(struct seq_file *m, void *v)
262 {
263         void *info = (void *)get_zeroed_page(GFP_KERNEL);
264         int level;
265
266         if (!info)
267                 return 0;
268         level = stsi(NULL, 0, 0, 0);
269         if (level >= 1)
270                 stsi_1_1_1(m, info);
271         if (level >= 1)
272                 stsi_15_1_x(m, info);
273         if (level >= 1)
274                 stsi_1_2_2(m, info);
275         if (level >= 2)
276                 stsi_2_2_2(m, info);
277         if (level >= 3)
278                 stsi_3_2_2(m, info);
279         free_page((unsigned long)info);
280         return 0;
281 }
282
283 static int sysinfo_open(struct inode *inode, struct file *file)
284 {
285         return single_open(file, sysinfo_show, NULL);
286 }
287
288 static const struct file_operations sysinfo_fops = {
289         .open           = sysinfo_open,
290         .read           = seq_read,
291         .llseek         = seq_lseek,
292         .release        = single_release,
293 };
294
295 static int __init sysinfo_create_proc(void)
296 {
297         proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
298         return 0;
299 }
300 device_initcall(sysinfo_create_proc);
301
302 /*
303  * Service levels interface.
304  */
305
306 static DECLARE_RWSEM(service_level_sem);
307 static LIST_HEAD(service_level_list);
308
309 int register_service_level(struct service_level *slr)
310 {
311         struct service_level *ptr;
312
313         down_write(&service_level_sem);
314         list_for_each_entry(ptr, &service_level_list, list)
315                 if (ptr == slr) {
316                         up_write(&service_level_sem);
317                         return -EEXIST;
318                 }
319         list_add_tail(&slr->list, &service_level_list);
320         up_write(&service_level_sem);
321         return 0;
322 }
323 EXPORT_SYMBOL(register_service_level);
324
325 int unregister_service_level(struct service_level *slr)
326 {
327         struct service_level *ptr, *next;
328         int rc = -ENOENT;
329
330         down_write(&service_level_sem);
331         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
332                 if (ptr != slr)
333                         continue;
334                 list_del(&ptr->list);
335                 rc = 0;
336                 break;
337         }
338         up_write(&service_level_sem);
339         return rc;
340 }
341 EXPORT_SYMBOL(unregister_service_level);
342
343 static void *service_level_start(struct seq_file *m, loff_t *pos)
344 {
345         down_read(&service_level_sem);
346         return seq_list_start(&service_level_list, *pos);
347 }
348
349 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
350 {
351         return seq_list_next(p, &service_level_list, pos);
352 }
353
354 static void service_level_stop(struct seq_file *m, void *p)
355 {
356         up_read(&service_level_sem);
357 }
358
359 static int service_level_show(struct seq_file *m, void *p)
360 {
361         struct service_level *slr;
362
363         slr = list_entry(p, struct service_level, list);
364         slr->seq_print(m, slr);
365         return 0;
366 }
367
368 static const struct seq_operations service_level_seq_ops = {
369         .start          = service_level_start,
370         .next           = service_level_next,
371         .stop           = service_level_stop,
372         .show           = service_level_show
373 };
374
375 static int service_level_open(struct inode *inode, struct file *file)
376 {
377         return seq_open(file, &service_level_seq_ops);
378 }
379
380 static const struct file_operations service_level_ops = {
381         .open           = service_level_open,
382         .read           = seq_read,
383         .llseek         = seq_lseek,
384         .release        = seq_release
385 };
386
387 static void service_level_vm_print(struct seq_file *m,
388                                    struct service_level *slr)
389 {
390         char *query_buffer, *str;
391
392         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
393         if (!query_buffer)
394                 return;
395         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
396         str = strchr(query_buffer, '\n');
397         if (str)
398                 *str = 0;
399         seq_printf(m, "VM: %s\n", query_buffer);
400         kfree(query_buffer);
401 }
402
403 static struct service_level service_level_vm = {
404         .seq_print = service_level_vm_print
405 };
406
407 static __init int create_proc_service_level(void)
408 {
409         proc_create("service_levels", 0, NULL, &service_level_ops);
410         if (MACHINE_IS_VM)
411                 register_service_level(&service_level_vm);
412         return 0;
413 }
414 subsys_initcall(create_proc_service_level);
415
416 /*
417  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
418  */
419 void s390_adjust_jiffies(void)
420 {
421         struct sysinfo_1_2_2 *info;
422         unsigned long capability;
423         struct kernel_fpu fpu;
424
425         info = (void *) get_zeroed_page(GFP_KERNEL);
426         if (!info)
427                 return;
428
429         if (stsi(info, 1, 2, 2) == 0) {
430                 /*
431                  * Major sigh. The cpu capability encoding is "special".
432                  * If the first 9 bits of info->capability are 0 then it
433                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
434                  * If the first 9 bits are != 0 then it is a 32 bit float.
435                  * In addition a lower value indicates a proportionally
436                  * higher cpu capacity. Bogomips are the other way round.
437                  * To get to a halfway suitable number we divide 1e7
438                  * by the cpu capability number. Yes, that means a floating
439                  * point division ..
440                  */
441                 kernel_fpu_begin(&fpu, KERNEL_FPR);
442                 asm volatile(
443                         "       sfpc    %3\n"
444                         "       l       %0,%1\n"
445                         "       tmlh    %0,0xff80\n"
446                         "       jnz     0f\n"
447                         "       cefbr   %%f2,%0\n"
448                         "       j       1f\n"
449                         "0:     le      %%f2,%1\n"
450                         "1:     cefbr   %%f0,%2\n"
451                         "       debr    %%f0,%%f2\n"
452                         "       cgebr   %0,5,%%f0\n"
453                         : "=&d" (capability)
454                         : "Q" (info->capability), "d" (10000000), "d" (0)
455                         : "cc"
456                         );
457                 kernel_fpu_end(&fpu, KERNEL_FPR);
458         } else
459                 /*
460                  * Really old machine without stsi block for basic
461                  * cpu information. Report 42.0 bogomips.
462                  */
463                 capability = 42;
464         loops_per_jiffy = capability * (500000/HZ);
465         free_page((unsigned long) info);
466 }
467
468 /*
469  * calibrate the delay loop
470  */
471 void calibrate_delay(void)
472 {
473         s390_adjust_jiffies();
474         /* Print the good old Bogomips line .. */
475         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
476                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
477                (loops_per_jiffy/(5000/HZ)) % 100);
478 }