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   1 /*
   2  *  drivers/s390/sysinfo.c
   3  *
   4  *  Copyright IBM Corp. 2001, 2008
   5  *  Author(s): Ulrich Weigand (Ulrich.Weigand@de.ibm.com)
   6  *             Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/init.h>
  14 #include <linux/delay.h>
  15 #include <linux/module.h>
  16 #include <asm/ebcdic.h>
  17 #include <asm/sysinfo.h>
  18 #include <asm/cpcmd.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 static inline int stsi_0(void)
  26 {
  27         int rc = stsi (NULL, 0, 0, 0);
  28         return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
  29 }
  30
  31 static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
  32 {
  33         if (stsi(info, 1, 1, 1) == -ENOSYS)
  34                 return len;
  35
  36         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  37         EBCASC(info->type, sizeof(info->type));
  38         EBCASC(info->model, sizeof(info->model));
  39         EBCASC(info->sequence, sizeof(info->sequence));
  40         EBCASC(info->plant, sizeof(info->plant));
  41         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  42         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  43         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  44         len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
  45                        info->manufacturer);
  46         len += sprintf(page + len, "Type:                 %-4.4s\n",
  47                        info->type);
  48         if (info->model[0] != '\0')
  49                 /*
  50                  * Sigh: the model field has been renamed with System z9
  51                  * to model_capacity and a new model field has been added
  52                  * after the plant field. To avoid confusing older programs
  53                  * the "Model:" prints "model_capacity model" or just
  54                  * "model_capacity" if the model string is empty .
  55                  */
  56                 len += sprintf(page + len,
  57                                "Model:                %-16.16s %-16.16s\n",
  58                                info->model_capacity, info->model);
  59         else
  60                 len += sprintf(page + len, "Model:                %-16.16s\n",
  61                                info->model_capacity);
  62         len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
  63                        info->sequence);
  64         len += sprintf(page + len, "Plant:                %-4.4s\n",
  65                        info->plant);
  66         len += sprintf(page + len, "Model Capacity:       %-16.16s %08u\n",
  67                        info->model_capacity, *(u32 *) info->model_cap_rating);
  68         if (info->model_perm_cap[0] != '\0')
  69                 len += sprintf(page + len,
  70                                "Model Perm. Capacity: %-16.16s %08u\n",
  71                                info->model_perm_cap,
  72                                *(u32 *) info->model_perm_cap_rating);
  73         if (info->model_temp_cap[0] != '\0')
  74                 len += sprintf(page + len,
  75                                "Model Temp. Capacity: %-16.16s %08u\n",
  76                                info->model_temp_cap,
  77                                *(u32 *) info->model_temp_cap_rating);
  78         return len;
  79 }
  80
  81 #if 0 /* Currently unused */
  82 static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
  83 {
  84         if (stsi(info, 1, 2, 1) == -ENOSYS)
  85                 return len;
  86
  87         len += sprintf(page + len, "\n");
  88         EBCASC(info->sequence, sizeof(info->sequence));
  89         EBCASC(info->plant, sizeof(info->plant));
  90         len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
  91                        info->sequence);
  92         len += sprintf(page + len, "Plant of CPU:         %-16.16s\n",
  93                        info->plant);
  94         return len;
  95 }
  96 #endif
  97
  98 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
  99 {
 100         struct sysinfo_1_2_2_extension *ext;
 101         int i;
 102
 103         if (stsi(info, 1, 2, 2) == -ENOSYS)
 104                 return len;
 105         ext = (struct sysinfo_1_2_2_extension *)
 106                 ((unsigned long) info + info->acc_offset);
 107
 108         len += sprintf(page + len, "\n");
 109         len += sprintf(page + len, "CPUs Total:           %d\n",
 110                        info->cpus_total);
 111         len += sprintf(page + len, "CPUs Configured:      %d\n",
 112                        info->cpus_configured);
 113         len += sprintf(page + len, "CPUs Standby:         %d\n",
 114                        info->cpus_standby);
 115         len += sprintf(page + len, "CPUs Reserved:        %d\n",
 116                        info->cpus_reserved);
 117
 118         if (info->format == 1) {
 119                 /*
 120                  * Sigh 2. According to the specification the alternate
 121                  * capability field is a 32 bit floating point number
 122                  * if the higher order 8 bits are not zero. Printing
 123                  * a floating point number in the kernel is a no-no,
 124                  * always print the number as 32 bit unsigned integer.
 125                  * The user-space needs to know about the strange
 126                  * encoding of the alternate cpu capability.
 127                  */
 128                 len += sprintf(page + len, "Capability:           %u %u\n",
 129                                info->capability, ext->alt_capability);
 130                 for (i = 2; i <= info->cpus_total; i++)
 131                         len += sprintf(page + len,
 132                                        "Adjustment %02d-way:    %u %u\n",
 133                                        i, info->adjustment[i-2],
 134                                        ext->alt_adjustment[i-2]);
 135
 136         } else {
 137                 len += sprintf(page + len, "Capability:           %u\n",
 138                                info->capability);
 139                 for (i = 2; i <= info->cpus_total; i++)
 140                         len += sprintf(page + len,
 141                                        "Adjustment %02d-way:    %u\n",
 142                                        i, info->adjustment[i-2]);
 143         }
 144
 145         if (info->secondary_capability != 0)
 146                 len += sprintf(page + len, "Secondary Capability: %d\n",
 147                                info->secondary_capability);
 148
 149         return len;
 150 }
 151
 152 #if 0 /* Currently unused */
 153 static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
 154 {
 155         if (stsi(info, 2, 2, 1) == -ENOSYS)
 156                 return len;
 157
 158         len += sprintf(page + len, "\n");
 159         EBCASC (info->sequence, sizeof(info->sequence));
 160         EBCASC (info->plant, sizeof(info->plant));
 161         len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
 162                        info->sequence);
 163         len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
 164                        info->plant);
 165         return len;
 166 }
 167 #endif
 168
 169 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 170 {
 171         if (stsi(info, 2, 2, 2) == -ENOSYS)
 172                 return len;
 173
 174         EBCASC (info->name, sizeof(info->name));
 175
 176         len += sprintf(page + len, "\n");
 177         len += sprintf(page + len, "LPAR Number:          %d\n",
 178                        info->lpar_number);
 179
 180         len += sprintf(page + len, "LPAR Characteristics: ");
 181         if (info->characteristics & LPAR_CHAR_DEDICATED)
 182                 len += sprintf(page + len, "Dedicated ");
 183         if (info->characteristics & LPAR_CHAR_SHARED)
 184                 len += sprintf(page + len, "Shared ");
 185         if (info->characteristics & LPAR_CHAR_LIMITED)
 186                 len += sprintf(page + len, "Limited ");
 187         len += sprintf(page + len, "\n");
 188
 189         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 190                        info->name);
 191
 192         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 193                        info->caf);
 194
 195         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 196                        info->cpus_total);
 197         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 198                        info->cpus_configured);
 199         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 200                        info->cpus_standby);
 201         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 202                        info->cpus_reserved);
 203         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 204                        info->cpus_dedicated);
 205         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 206                        info->cpus_shared);
 207         return len;
 208 }
 209
 210 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 211 {
 212         int i;
 213
 214         if (stsi(info, 3, 2, 2) == -ENOSYS)
 215                 return len;
 216         for (i = 0; i < info->count; i++) {
 217                 EBCASC (info->vm[i].name, sizeof(info->vm[i].name));
 218                 EBCASC (info->vm[i].cpi, sizeof(info->vm[i].cpi));
 219                 len += sprintf(page + len, "\n");
 220                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 221                                i, info->vm[i].name);
 222                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 223                                i, info->vm[i].cpi);
 224
 225                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 226                                i, info->vm[i].caf);
 227
 228                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 229                                i, info->vm[i].cpus_total);
 230                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 231                                i, info->vm[i].cpus_configured);
 232                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 233                                i, info->vm[i].cpus_standby);
 234                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 235                                i, info->vm[i].cpus_reserved);
 236         }
 237         return len;
 238 }
 239
 240
 241 static int proc_read_sysinfo(char *page, char **start,
 242                              off_t off, int count,
 243                              int *eof, void *data)
 244 {
 245         unsigned long info = get_zeroed_page (GFP_KERNEL);
 246         int level, len;
 247
 248         if (!info)
 249                 return 0;
 250
 251         len = 0;
 252         level = stsi_0();
 253         if (level >= 1)
 254                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 255
 256         if (level >= 1)
 257                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 258
 259         if (level >= 2)
 260                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 261
 262         if (level >= 3)
 263                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 264
 265         free_page (info);
 266         return len;
 267 }
 268
 269 static __init int create_proc_sysinfo(void)
 270 {
 271         create_proc_read_entry("sysinfo", 0444, NULL,
 272                                proc_read_sysinfo, NULL);
 273         return 0;
 274 }
 275
 276 __initcall(create_proc_sysinfo);
 277
 278 /*
 279  * Service levels interface.
 280  */
 281
 282 static DECLARE_RWSEM(service_level_sem);
 283 static LIST_HEAD(service_level_list);
 284
 285 int register_service_level(struct service_level *slr)
 286 {
 287         struct service_level *ptr;
 288
 289         down_write(&service_level_sem);
 290         list_for_each_entry(ptr, &service_level_list, list)
 291                 if (ptr == slr) {
 292                         up_write(&service_level_sem);
 293                         return -EEXIST;
 294                 }
 295         list_add_tail(&slr->list, &service_level_list);
 296         up_write(&service_level_sem);
 297         return 0;
 298 }
 299 EXPORT_SYMBOL(register_service_level);
 300
 301 int unregister_service_level(struct service_level *slr)
 302 {
 303         struct service_level *ptr, *next;
 304         int rc = -ENOENT;
 305
 306         down_write(&service_level_sem);
 307         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 308                 if (ptr != slr)
 309                         continue;
 310                 list_del(&ptr->list);
 311                 rc = 0;
 312                 break;
 313         }
 314         up_write(&service_level_sem);
 315         return rc;
 316 }
 317 EXPORT_SYMBOL(unregister_service_level);
 318
 319 static void *service_level_start(struct seq_file *m, loff_t *pos)
 320 {
 321         down_read(&service_level_sem);
 322         return seq_list_start(&service_level_list, *pos);
 323 }
 324
 325 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 326 {
 327         return seq_list_next(p, &service_level_list, pos);
 328 }
 329
 330 static void service_level_stop(struct seq_file *m, void *p)
 331 {
 332         up_read(&service_level_sem);
 333 }
 334
 335 static int service_level_show(struct seq_file *m, void *p)
 336 {
 337         struct service_level *slr;
 338
 339         slr = list_entry(p, struct service_level, list);
 340         slr->seq_print(m, slr);
 341         return 0;
 342 }
 343
 344 static const struct seq_operations service_level_seq_ops = {
 345         .start          = service_level_start,
 346         .next           = service_level_next,
 347         .stop           = service_level_stop,
 348         .show           = service_level_show
 349 };
 350
 351 static int service_level_open(struct inode *inode, struct file *file)
 352 {
 353         return seq_open(file, &service_level_seq_ops);
 354 }
 355
 356 static const struct file_operations service_level_ops = {
 357         .open           = service_level_open,
 358         .read           = seq_read,
 359         .llseek         = seq_lseek,
 360         .release        = seq_release
 361 };
 362
 363 static void service_level_vm_print(struct seq_file *m,
 364                                    struct service_level *slr)
 365 {
 366         char *query_buffer, *str;
 367
 368         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 369         if (!query_buffer)
 370                 return;
 371         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 372         str = strchr(query_buffer, '\n');
 373         if (str)
 374                 *str = 0;
 375         seq_printf(m, "VM: %s\n", query_buffer);
 376         kfree(query_buffer);
 377 }
 378
 379 static struct service_level service_level_vm = {
 380         .seq_print = service_level_vm_print
 381 };
 382
 383 static __init int create_proc_service_level(void)
 384 {
 385         proc_create("service_levels", 0, NULL, &service_level_ops);
 386         if (MACHINE_IS_VM)
 387                 register_service_level(&service_level_vm);
 388         return 0;
 389 }
 390
 391 subsys_initcall(create_proc_service_level);
 392
 393 /*
 394  * Bogomips calculation based on cpu capability.
 395  */
 396
 397 int get_cpu_capability(unsigned int *capability)
 398 {
 399         struct sysinfo_1_2_2 *info;
 400         int rc;
 401
 402         info = (void *) get_zeroed_page(GFP_KERNEL);
 403         if (!info)
 404                 return -ENOMEM;
 405         rc = stsi(info, 1, 2, 2);
 406         if (rc == -ENOSYS)
 407                 goto out;
 408         rc = 0;
 409         *capability = info->capability;
 410 out:
 411         free_page((unsigned long) info);
 412         return rc;
 413 }
 414
 415 /*
 416  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 417  */
 418 void s390_adjust_jiffies(void)
 419 {
 420         struct sysinfo_1_2_2 *info;
 421         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 422         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 423         FP_DECL_EX;
 424         unsigned int capability;
 425
 426         info = (void *) get_zeroed_page(GFP_KERNEL);
 427         if (!info)
 428                 return;
 429
 430         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 431                 /*
 432                  * Major sigh. The cpu capability encoding is "special".
 433                  * If the first 9 bits of info->capability are 0 then it
 434                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 435                  * If the first 9 bits are != 0 then it is a 32 bit float.
 436                  * In addition a lower value indicates a proportionally
 437                  * higher cpu capacity. Bogomips are the other way round.
 438                  * To get to a halfway suitable number we divide 1e7
 439                  * by the cpu capability number. Yes, that means a floating
 440                  * point division .. math-emu here we come :-)
 441                  */
 442                 FP_UNPACK_SP(SA, &fmil);
 443                 if ((info->capability >> 23) == 0)
 444                         FP_FROM_INT_S(SB, info->capability, 32, int);
 445                 else
 446                         FP_UNPACK_SP(SB, &info->capability);
 447                 FP_DIV_S(SR, SA, SB);
 448                 FP_TO_INT_S(capability, SR, 32, 0);
 449         } else
 450                 /*
 451                  * Really old machine without stsi block for basic
 452                  * cpu information. Report 42.0 bogomips.
 453                  */
 454                 capability = 42;
 455         loops_per_jiffy = capability * (500000/HZ);
 456         free_page((unsigned long) info);
 457 }
 458
 459 /*
 460  * calibrate the delay loop
 461  */
 462 void __cpuinit calibrate_delay(void)
 463 {
 464         s390_adjust_jiffies();
 465         /* Print the good old Bogomips line .. */
 466         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 467                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 468                (loops_per_jiffy/(5000/HZ)) % 100);
 469 }