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TOMOYO Linux Cross Reference
Linux/arch/s390/kernel/sysinfo.c

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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  */
 33 int stsi(void *sysinfo, int fc, int sel1, int sel2)
 34 {
 35         register int r0 asm("") = (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 
 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 
112 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
113 {
114         int i;
115 
116         seq_putc(m, '\n');
117         if (!MACHINE_HAS_TOPOLOGY)
118                 return;
119         if (stsi(info, 15, 1, topology_max_mnest))
120                 return;
121         seq_printf(m, "CPU Topology HW:     ");
122         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
123                 seq_printf(m, " %d", info->mag[i]);
124         seq_putc(m, '\n');
125 #ifdef CONFIG_SCHED_TOPOLOGY
126         store_topology(info);
127         seq_printf(m, "CPU Topology SW:     ");
128         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
129                 seq_printf(m, " %d", info->mag[i]);
130         seq_putc(m, '\n');
131 #endif
132 }
133 
134 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
135 {
136         struct sysinfo_1_2_2_extension *ext;
137         int i;
138 
139         if (stsi(info, 1, 2, 2))
140                 return;
141         ext = (struct sysinfo_1_2_2_extension *)
142                 ((unsigned long) info + info->acc_offset);
143         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
144         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
145         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
146         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
147         if (info->mt_installed) {
148                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
149                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
150         }
151         /*
152          * Sigh 2. According to the specification the alternate
153          * capability field is a 32 bit floating point number
154          * if the higher order 8 bits are not zero. Printing
155          * a floating point number in the kernel is a no-no,
156          * always print the number as 32 bit unsigned integer.
157          * The user-space needs to know about the strange
158          * encoding of the alternate cpu capability.
159          */
160         seq_printf(m, "Capability:           %u", info->capability);
161         if (info->format == 1)
162                 seq_printf(m, " %u", ext->alt_capability);
163         seq_putc(m, '\n');
164         if (info->nominal_cap)
165                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
166         if (info->secondary_cap)
167                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
168         for (i = 2; i <= info->cpus_total; i++) {
169                 seq_printf(m, "Adjustment %02d-way:    %u",
170                            i, info->adjustment[i-2]);
171                 if (info->format == 1)
172                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
173                 seq_putc(m, '\n');
174         }
175 }
176 
177 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
178 {
179         if (stsi(info, 2, 2, 2))
180                 return;
181         EBCASC(info->name, sizeof(info->name));
182         seq_putc(m, '\n');
183         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
184         seq_printf(m, "LPAR Characteristics: ");
185         if (info->characteristics & LPAR_CHAR_DEDICATED)
186                 seq_printf(m, "Dedicated ");
187         if (info->characteristics & LPAR_CHAR_SHARED)
188                 seq_printf(m, "Shared ");
189         if (info->characteristics & LPAR_CHAR_LIMITED)
190                 seq_printf(m, "Limited ");
191         seq_putc(m, '\n');
192         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
193         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
194         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
195         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
196         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
197         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
198         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
199         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
200         if (info->mt_installed) {
201                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
202                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
203                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
204         }
205 }
206 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
349 static void service_level_stop(struct seq_file *m, void *p)
350 {
351         up_read(&service_level_sem);
352 }
353 
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 
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 
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 
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  */
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  */
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 

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