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
  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
  24 static 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
  30 static 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         if (info->cai) {
  78                 len += sprintf(page + len,
  79                                "Capacity Adj. Ind.:   %d\n",
  80                                info->cai);
  81                 len += sprintf(page + len, "Capacity Ch. Reason:  %d\n",
  82                                info->ccr);
  83         }
  84         return len;
  85 }
  86
  87 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
  88 {
  89         struct sysinfo_1_2_2_extension *ext;
  90         int i;
  91
  92         if (stsi(info, 1, 2, 2) == -ENOSYS)
  93                 return len;
  94         ext = (struct sysinfo_1_2_2_extension *)
  95                 ((unsigned long) info + info->acc_offset);
  96
  97         len += sprintf(page + len, "\n");
  98         len += sprintf(page + len, "CPUs Total:           %d\n",
  99                        info->cpus_total);
 100         len += sprintf(page + len, "CPUs Configured:      %d\n",
 101                        info->cpus_configured);
 102         len += sprintf(page + len, "CPUs Standby:         %d\n",
 103                        info->cpus_standby);
 104         len += sprintf(page + len, "CPUs Reserved:        %d\n",
 105                        info->cpus_reserved);
 106
 107         if (info->format == 1) {
 108                 /*
 109                  * Sigh 2. According to the specification the alternate
 110                  * capability field is a 32 bit floating point number
 111                  * if the higher order 8 bits are not zero. Printing
 112                  * a floating point number in the kernel is a no-no,
 113                  * always print the number as 32 bit unsigned integer.
 114                  * The user-space needs to know about the strange
 115                  * encoding of the alternate cpu capability.
 116                  */
 117                 len += sprintf(page + len, "Capability:           %u %u\n",
 118                                info->capability, ext->alt_capability);
 119                 for (i = 2; i <= info->cpus_total; i++)
 120                         len += sprintf(page + len,
 121                                        "Adjustment %02d-way:    %u %u\n",
 122                                        i, info->adjustment[i-2],
 123                                        ext->alt_adjustment[i-2]);
 124
 125         } else {
 126                 len += sprintf(page + len, "Capability:           %u\n",
 127                                info->capability);
 128                 for (i = 2; i <= info->cpus_total; i++)
 129                         len += sprintf(page + len,
 130                                        "Adjustment %02d-way:    %u\n",
 131                                        i, info->adjustment[i-2]);
 132         }
 133
 134         if (info->secondary_capability != 0)
 135                 len += sprintf(page + len, "Secondary Capability: %d\n",
 136                                info->secondary_capability);
 137         return len;
 138 }
 139
 140 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 141 {
 142         if (stsi(info, 2, 2, 2) == -ENOSYS)
 143                 return len;
 144
 145         EBCASC(info->name, sizeof(info->name));
 146
 147         len += sprintf(page + len, "\n");
 148         len += sprintf(page + len, "LPAR Number:          %d\n",
 149                        info->lpar_number);
 150
 151         len += sprintf(page + len, "LPAR Characteristics: ");
 152         if (info->characteristics & LPAR_CHAR_DEDICATED)
 153                 len += sprintf(page + len, "Dedicated ");
 154         if (info->characteristics & LPAR_CHAR_SHARED)
 155                 len += sprintf(page + len, "Shared ");
 156         if (info->characteristics & LPAR_CHAR_LIMITED)
 157                 len += sprintf(page + len, "Limited ");
 158         len += sprintf(page + len, "\n");
 159
 160         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 161                        info->name);
 162
 163         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 164                        info->caf);
 165
 166         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 167                        info->cpus_total);
 168         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 169                        info->cpus_configured);
 170         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 171                        info->cpus_standby);
 172         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 173                        info->cpus_reserved);
 174         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 175                        info->cpus_dedicated);
 176         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 177                        info->cpus_shared);
 178         return len;
 179 }
 180
 181 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 182 {
 183         int i;
 184
 185         if (stsi(info, 3, 2, 2) == -ENOSYS)
 186                 return len;
 187         for (i = 0; i < info->count; i++) {
 188                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 189                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 190                 len += sprintf(page + len, "\n");
 191                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 192                                i, info->vm[i].name);
 193                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 194                                i, info->vm[i].cpi);
 195
 196                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 197                                i, info->vm[i].caf);
 198
 199                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 200                                i, info->vm[i].cpus_total);
 201                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 202                                i, info->vm[i].cpus_configured);
 203                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 204                                i, info->vm[i].cpus_standby);
 205                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 206                                i, info->vm[i].cpus_reserved);
 207         }
 208         return len;
 209 }
 210
 211 static int proc_read_sysinfo(char *page, char **start,
 212                              off_t off, int count,
 213                              int *eof, void *data)
 214 {
 215         unsigned long info = get_zeroed_page(GFP_KERNEL);
 216         int level, len;
 217
 218         if (!info)
 219                 return 0;
 220
 221         len = 0;
 222         level = stsi_0();
 223         if (level >= 1)
 224                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 225
 226         if (level >= 1)
 227                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 228
 229         if (level >= 2)
 230                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 231
 232         if (level >= 3)
 233                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 234
 235         free_page(info);
 236         return len;
 237 }
 238
 239 static __init int create_proc_sysinfo(void)
 240 {
 241         create_proc_read_entry("sysinfo", 0444, NULL,
 242                                proc_read_sysinfo, NULL);
 243         return 0;
 244 }
 245 device_initcall(create_proc_sysinfo);
 246
 247 /*
 248  * Service levels interface.
 249  */
 250
 251 static DECLARE_RWSEM(service_level_sem);
 252 static LIST_HEAD(service_level_list);
 253
 254 int register_service_level(struct service_level *slr)
 255 {
 256         struct service_level *ptr;
 257
 258         down_write(&service_level_sem);
 259         list_for_each_entry(ptr, &service_level_list, list)
 260                 if (ptr == slr) {
 261                         up_write(&service_level_sem);
 262                         return -EEXIST;
 263                 }
 264         list_add_tail(&slr->list, &service_level_list);
 265         up_write(&service_level_sem);
 266         return 0;
 267 }
 268 EXPORT_SYMBOL(register_service_level);
 269
 270 int unregister_service_level(struct service_level *slr)
 271 {
 272         struct service_level *ptr, *next;
 273         int rc = -ENOENT;
 274
 275         down_write(&service_level_sem);
 276         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 277                 if (ptr != slr)
 278                         continue;
 279                 list_del(&ptr->list);
 280                 rc = 0;
 281                 break;
 282         }
 283         up_write(&service_level_sem);
 284         return rc;
 285 }
 286 EXPORT_SYMBOL(unregister_service_level);
 287
 288 static void *service_level_start(struct seq_file *m, loff_t *pos)
 289 {
 290         down_read(&service_level_sem);
 291         return seq_list_start(&service_level_list, *pos);
 292 }
 293
 294 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 295 {
 296         return seq_list_next(p, &service_level_list, pos);
 297 }
 298
 299 static void service_level_stop(struct seq_file *m, void *p)
 300 {
 301         up_read(&service_level_sem);
 302 }
 303
 304 static int service_level_show(struct seq_file *m, void *p)
 305 {
 306         struct service_level *slr;
 307
 308         slr = list_entry(p, struct service_level, list);
 309         slr->seq_print(m, slr);
 310         return 0;
 311 }
 312
 313 static const struct seq_operations service_level_seq_ops = {
 314         .start          = service_level_start,
 315         .next           = service_level_next,
 316         .stop           = service_level_stop,
 317         .show           = service_level_show
 318 };
 319
 320 static int service_level_open(struct inode *inode, struct file *file)
 321 {
 322         return seq_open(file, &service_level_seq_ops);
 323 }
 324
 325 static const struct file_operations service_level_ops = {
 326         .open           = service_level_open,
 327         .read           = seq_read,
 328         .llseek         = seq_lseek,
 329         .release        = seq_release
 330 };
 331
 332 static void service_level_vm_print(struct seq_file *m,
 333                                    struct service_level *slr)
 334 {
 335         char *query_buffer, *str;
 336
 337         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 338         if (!query_buffer)
 339                 return;
 340         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 341         str = strchr(query_buffer, '\n');
 342         if (str)
 343                 *str = 0;
 344         seq_printf(m, "VM: %s\n", query_buffer);
 345         kfree(query_buffer);
 346 }
 347
 348 static struct service_level service_level_vm = {
 349         .seq_print = service_level_vm_print
 350 };
 351
 352 static __init int create_proc_service_level(void)
 353 {
 354         proc_create("service_levels", 0, NULL, &service_level_ops);
 355         if (MACHINE_IS_VM)
 356                 register_service_level(&service_level_vm);
 357         return 0;
 358 }
 359 subsys_initcall(create_proc_service_level);
 360
 361 /*
 362  * Bogomips calculation based on cpu capability.
 363  */
 364 int get_cpu_capability(unsigned int *capability)
 365 {
 366         struct sysinfo_1_2_2 *info;
 367         int rc;
 368
 369         info = (void *) get_zeroed_page(GFP_KERNEL);
 370         if (!info)
 371                 return -ENOMEM;
 372         rc = stsi(info, 1, 2, 2);
 373         if (rc == -ENOSYS)
 374                 goto out;
 375         rc = 0;
 376         *capability = info->capability;
 377 out:
 378         free_page((unsigned long) info);
 379         return rc;
 380 }
 381
 382 /*
 383  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 384  */
 385 void s390_adjust_jiffies(void)
 386 {
 387         struct sysinfo_1_2_2 *info;
 388         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 389         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 390         FP_DECL_EX;
 391         unsigned int capability;
 392
 393         info = (void *) get_zeroed_page(GFP_KERNEL);
 394         if (!info)
 395                 return;
 396
 397         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 398                 /*
 399                  * Major sigh. The cpu capability encoding is "special".
 400                  * If the first 9 bits of info->capability are 0 then it
 401                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 402                  * If the first 9 bits are != 0 then it is a 32 bit float.
 403                  * In addition a lower value indicates a proportionally
 404                  * higher cpu capacity. Bogomips are the other way round.
 405                  * To get to a halfway suitable number we divide 1e7
 406                  * by the cpu capability number. Yes, that means a floating
 407                  * point division .. math-emu here we come :-)
 408                  */
 409                 FP_UNPACK_SP(SA, &fmil);
 410                 if ((info->capability >> 23) == 0)
 411                         FP_FROM_INT_S(SB, info->capability, 32, int);
 412                 else
 413                         FP_UNPACK_SP(SB, &info->capability);
 414                 FP_DIV_S(SR, SA, SB);
 415                 FP_TO_INT_S(capability, SR, 32, 0);
 416         } else
 417                 /*
 418                  * Really old machine without stsi block for basic
 419                  * cpu information. Report 42.0 bogomips.
 420                  */
 421                 capability = 42;
 422         loops_per_jiffy = capability * (500000/HZ);
 423         free_page((unsigned long) info);
 424 }
 425
 426 /*
 427  * calibrate the delay loop
 428  */
 429 void __cpuinit calibrate_delay(void)
 430 {
 431         s390_adjust_jiffies();
 432         /* Print the good old Bogomips line .. */
 433         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 434                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 435                (loops_per_jiffy/(5000/HZ)) % 100);
 436 }