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
  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         if (info->cai) {
  79                 len += sprintf(page + len,
  80                                "Capacity Adj. Ind.:   %d\n",
  81                                info->cai);
  82                 len += sprintf(page + len, "Capacity Ch. Reason:  %d\n",
  83                                info->ccr);
  84         }
  85         return len;
  86 }
  87
  88 static int stsi_15_1_x(struct sysinfo_15_1_x *info, char *page, int len)
  89 {
  90         static int max_mnest;
  91         int i, rc;
  92
  93         len += sprintf(page + len, "\n");
  94         if (!MACHINE_HAS_TOPOLOGY)
  95                 return len;
  96         if (max_mnest) {
  97                 stsi(info, 15, 1, max_mnest);
  98         } else {
  99                 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
 100                         rc = stsi(info, 15, 1, max_mnest);
 101                         if (rc != -ENOSYS)
 102                                 break;
 103                 }
 104         }
 105         len += sprintf(page + len, "CPU Topology HW:     ");
 106         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 107                 len += sprintf(page + len, " %d", info->mag[i]);
 108         len += sprintf(page + len, "\n");
 109 #ifdef CONFIG_SCHED_MC
 110         store_topology(info);
 111         len += sprintf(page + len, "CPU Topology SW:     ");
 112         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 113                 len += sprintf(page + len, " %d", info->mag[i]);
 114         len += sprintf(page + len, "\n");
 115 #endif
 116         return len;
 117 }
 118
 119 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
 120 {
 121         struct sysinfo_1_2_2_extension *ext;
 122         int i;
 123
 124         if (stsi(info, 1, 2, 2) == -ENOSYS)
 125                 return len;
 126         ext = (struct sysinfo_1_2_2_extension *)
 127                 ((unsigned long) info + info->acc_offset);
 128
 129         len += sprintf(page + len, "CPUs Total:           %d\n",
 130                        info->cpus_total);
 131         len += sprintf(page + len, "CPUs Configured:      %d\n",
 132                        info->cpus_configured);
 133         len += sprintf(page + len, "CPUs Standby:         %d\n",
 134                        info->cpus_standby);
 135         len += sprintf(page + len, "CPUs Reserved:        %d\n",
 136                        info->cpus_reserved);
 137
 138         if (info->format == 1) {
 139                 /*
 140                  * Sigh 2. According to the specification the alternate
 141                  * capability field is a 32 bit floating point number
 142                  * if the higher order 8 bits are not zero. Printing
 143                  * a floating point number in the kernel is a no-no,
 144                  * always print the number as 32 bit unsigned integer.
 145                  * The user-space needs to know about the strange
 146                  * encoding of the alternate cpu capability.
 147                  */
 148                 len += sprintf(page + len, "Capability:           %u %u\n",
 149                                info->capability, ext->alt_capability);
 150                 for (i = 2; i <= info->cpus_total; i++)
 151                         len += sprintf(page + len,
 152                                        "Adjustment %02d-way:    %u %u\n",
 153                                        i, info->adjustment[i-2],
 154                                        ext->alt_adjustment[i-2]);
 155
 156         } else {
 157                 len += sprintf(page + len, "Capability:           %u\n",
 158                                info->capability);
 159                 for (i = 2; i <= info->cpus_total; i++)
 160                         len += sprintf(page + len,
 161                                        "Adjustment %02d-way:    %u\n",
 162                                        i, info->adjustment[i-2]);
 163         }
 164
 165         if (info->secondary_capability != 0)
 166                 len += sprintf(page + len, "Secondary Capability: %d\n",
 167                                info->secondary_capability);
 168         return len;
 169 }
 170
 171 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 172 {
 173         if (stsi(info, 2, 2, 2) == -ENOSYS)
 174                 return len;
 175
 176         EBCASC(info->name, sizeof(info->name));
 177
 178         len += sprintf(page + len, "\n");
 179         len += sprintf(page + len, "LPAR Number:          %d\n",
 180                        info->lpar_number);
 181
 182         len += sprintf(page + len, "LPAR Characteristics: ");
 183         if (info->characteristics & LPAR_CHAR_DEDICATED)
 184                 len += sprintf(page + len, "Dedicated ");
 185         if (info->characteristics & LPAR_CHAR_SHARED)
 186                 len += sprintf(page + len, "Shared ");
 187         if (info->characteristics & LPAR_CHAR_LIMITED)
 188                 len += sprintf(page + len, "Limited ");
 189         len += sprintf(page + len, "\n");
 190
 191         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 192                        info->name);
 193
 194         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 195                        info->caf);
 196
 197         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 198                        info->cpus_total);
 199         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 200                        info->cpus_configured);
 201         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 202                        info->cpus_standby);
 203         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 204                        info->cpus_reserved);
 205         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 206                        info->cpus_dedicated);
 207         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 208                        info->cpus_shared);
 209         return len;
 210 }
 211
 212 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 213 {
 214         int i;
 215
 216         if (stsi(info, 3, 2, 2) == -ENOSYS)
 217                 return len;
 218         for (i = 0; i < info->count; i++) {
 219                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 220                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 221                 len += sprintf(page + len, "\n");
 222                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 223                                i, info->vm[i].name);
 224                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 225                                i, info->vm[i].cpi);
 226
 227                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 228                                i, info->vm[i].caf);
 229
 230                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 231                                i, info->vm[i].cpus_total);
 232                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 233                                i, info->vm[i].cpus_configured);
 234                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 235                                i, info->vm[i].cpus_standby);
 236                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 237                                i, info->vm[i].cpus_reserved);
 238         }
 239         return len;
 240 }
 241
 242 static int proc_read_sysinfo(char *page, char **start,
 243                              off_t off, int count,
 244                              int *eof, void *data)
 245 {
 246         unsigned long info = get_zeroed_page(GFP_KERNEL);
 247         int level, len;
 248
 249         if (!info)
 250                 return 0;
 251
 252         len = 0;
 253         level = stsi_0();
 254         if (level >= 1)
 255                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 256
 257         if (level >= 1)
 258                 len = stsi_15_1_x((struct sysinfo_15_1_x *) info, page, len);
 259
 260         if (level >= 1)
 261                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 262
 263         if (level >= 2)
 264                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 265
 266         if (level >= 3)
 267                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 268
 269         free_page(info);
 270         return len;
 271 }
 272
 273 static __init int create_proc_sysinfo(void)
 274 {
 275         create_proc_read_entry("sysinfo", 0444, NULL,
 276                                proc_read_sysinfo, NULL);
 277         return 0;
 278 }
 279 device_initcall(create_proc_sysinfo);
 280
 281 /*
 282  * Service levels interface.
 283  */
 284
 285 static DECLARE_RWSEM(service_level_sem);
 286 static LIST_HEAD(service_level_list);
 287
 288 int register_service_level(struct service_level *slr)
 289 {
 290         struct service_level *ptr;
 291
 292         down_write(&service_level_sem);
 293         list_for_each_entry(ptr, &service_level_list, list)
 294                 if (ptr == slr) {
 295                         up_write(&service_level_sem);
 296                         return -EEXIST;
 297                 }
 298         list_add_tail(&slr->list, &service_level_list);
 299         up_write(&service_level_sem);
 300         return 0;
 301 }
 302 EXPORT_SYMBOL(register_service_level);
 303
 304 int unregister_service_level(struct service_level *slr)
 305 {
 306         struct service_level *ptr, *next;
 307         int rc = -ENOENT;
 308
 309         down_write(&service_level_sem);
 310         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 311                 if (ptr != slr)
 312                         continue;
 313                 list_del(&ptr->list);
 314                 rc = 0;
 315                 break;
 316         }
 317         up_write(&service_level_sem);
 318         return rc;
 319 }
 320 EXPORT_SYMBOL(unregister_service_level);
 321
 322 static void *service_level_start(struct seq_file *m, loff_t *pos)
 323 {
 324         down_read(&service_level_sem);
 325         return seq_list_start(&service_level_list, *pos);
 326 }
 327
 328 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 329 {
 330         return seq_list_next(p, &service_level_list, pos);
 331 }
 332
 333 static void service_level_stop(struct seq_file *m, void *p)
 334 {
 335         up_read(&service_level_sem);
 336 }
 337
 338 static int service_level_show(struct seq_file *m, void *p)
 339 {
 340         struct service_level *slr;
 341
 342         slr = list_entry(p, struct service_level, list);
 343         slr->seq_print(m, slr);
 344         return 0;
 345 }
 346
 347 static const struct seq_operations service_level_seq_ops = {
 348         .start          = service_level_start,
 349         .next           = service_level_next,
 350         .stop           = service_level_stop,
 351         .show           = service_level_show
 352 };
 353
 354 static int service_level_open(struct inode *inode, struct file *file)
 355 {
 356         return seq_open(file, &service_level_seq_ops);
 357 }
 358
 359 static const struct file_operations service_level_ops = {
 360         .open           = service_level_open,
 361         .read           = seq_read,
 362         .llseek         = seq_lseek,
 363         .release        = seq_release
 364 };
 365
 366 static void service_level_vm_print(struct seq_file *m,
 367                                    struct service_level *slr)
 368 {
 369         char *query_buffer, *str;
 370
 371         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 372         if (!query_buffer)
 373                 return;
 374         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 375         str = strchr(query_buffer, '\n');
 376         if (str)
 377                 *str = 0;
 378         seq_printf(m, "VM: %s\n", query_buffer);
 379         kfree(query_buffer);
 380 }
 381
 382 static struct service_level service_level_vm = {
 383         .seq_print = service_level_vm_print
 384 };
 385
 386 static __init int create_proc_service_level(void)
 387 {
 388         proc_create("service_levels", 0, NULL, &service_level_ops);
 389         if (MACHINE_IS_VM)
 390                 register_service_level(&service_level_vm);
 391         return 0;
 392 }
 393 subsys_initcall(create_proc_service_level);
 394
 395 /*
 396  * Bogomips calculation based on cpu capability.
 397  */
 398 int get_cpu_capability(unsigned int *capability)
 399 {
 400         struct sysinfo_1_2_2 *info;
 401         int rc;
 402
 403         info = (void *) get_zeroed_page(GFP_KERNEL);
 404         if (!info)
 405                 return -ENOMEM;
 406         rc = stsi(info, 1, 2, 2);
 407         if (rc == -ENOSYS)
 408                 goto out;
 409         rc = 0;
 410         *capability = info->capability;
 411 out:
 412         free_page((unsigned long) info);
 413         return rc;
 414 }
 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         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 423         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 424         FP_DECL_EX;
 425         unsigned int capability;
 426
 427         info = (void *) get_zeroed_page(GFP_KERNEL);
 428         if (!info)
 429                 return;
 430
 431         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 432                 /*
 433                  * Major sigh. The cpu capability encoding is "special".
 434                  * If the first 9 bits of info->capability are 0 then it
 435                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 436                  * If the first 9 bits are != 0 then it is a 32 bit float.
 437                  * In addition a lower value indicates a proportionally
 438                  * higher cpu capacity. Bogomips are the other way round.
 439                  * To get to a halfway suitable number we divide 1e7
 440                  * by the cpu capability number. Yes, that means a floating
 441                  * point division .. math-emu here we come :-)
 442                  */
 443                 FP_UNPACK_SP(SA, &fmil);
 444                 if ((info->capability >> 23) == 0)
 445                         FP_FROM_INT_S(SB, info->capability, 32, int);
 446                 else
 447                         FP_UNPACK_SP(SB, &info->capability);
 448                 FP_DIV_S(SR, SA, SB);
 449                 FP_TO_INT_S(capability, SR, 32, 0);
 450         } else
 451                 /*
 452                  * Really old machine without stsi block for basic
 453                  * cpu information. Report 42.0 bogomips.
 454                  */
 455                 capability = 42;
 456         loops_per_jiffy = capability * (500000/HZ);
 457         free_page((unsigned long) info);
 458 }
 459
 460 /*
 461  * calibrate the delay loop
 462  */
 463 void __cpuinit calibrate_delay(void)
 464 {
 465         s390_adjust_jiffies();
 466         /* Print the good old Bogomips line .. */
 467         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 468                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 469                (loops_per_jiffy/(5000/HZ)) % 100);
 470 }