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         store_topology(info);
 110         len += sprintf(page + len, "CPU Topology SW:     ");
 111         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 112                 len += sprintf(page + len, " %d", info->mag[i]);
 113         len += sprintf(page + len, "\n");
 114         return len;
 115 }
 116
 117 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
 118 {
 119         struct sysinfo_1_2_2_extension *ext;
 120         int i;
 121
 122         if (stsi(info, 1, 2, 2) == -ENOSYS)
 123                 return len;
 124         ext = (struct sysinfo_1_2_2_extension *)
 125                 ((unsigned long) info + info->acc_offset);
 126
 127         len += sprintf(page + len, "CPUs Total:           %d\n",
 128                        info->cpus_total);
 129         len += sprintf(page + len, "CPUs Configured:      %d\n",
 130                        info->cpus_configured);
 131         len += sprintf(page + len, "CPUs Standby:         %d\n",
 132                        info->cpus_standby);
 133         len += sprintf(page + len, "CPUs Reserved:        %d\n",
 134                        info->cpus_reserved);
 135
 136         if (info->format == 1) {
 137                 /*
 138                  * Sigh 2. According to the specification the alternate
 139                  * capability field is a 32 bit floating point number
 140                  * if the higher order 8 bits are not zero. Printing
 141                  * a floating point number in the kernel is a no-no,
 142                  * always print the number as 32 bit unsigned integer.
 143                  * The user-space needs to know about the strange
 144                  * encoding of the alternate cpu capability.
 145                  */
 146                 len += sprintf(page + len, "Capability:           %u %u\n",
 147                                info->capability, ext->alt_capability);
 148                 for (i = 2; i <= info->cpus_total; i++)
 149                         len += sprintf(page + len,
 150                                        "Adjustment %02d-way:    %u %u\n",
 151                                        i, info->adjustment[i-2],
 152                                        ext->alt_adjustment[i-2]);
 153
 154         } else {
 155                 len += sprintf(page + len, "Capability:           %u\n",
 156                                info->capability);
 157                 for (i = 2; i <= info->cpus_total; i++)
 158                         len += sprintf(page + len,
 159                                        "Adjustment %02d-way:    %u\n",
 160                                        i, info->adjustment[i-2]);
 161         }
 162
 163         if (info->secondary_capability != 0)
 164                 len += sprintf(page + len, "Secondary Capability: %d\n",
 165                                info->secondary_capability);
 166         return len;
 167 }
 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 static int proc_read_sysinfo(char *page, char **start,
 241                              off_t off, int count,
 242                              int *eof, void *data)
 243 {
 244         unsigned long info = get_zeroed_page(GFP_KERNEL);
 245         int level, len;
 246
 247         if (!info)
 248                 return 0;
 249
 250         len = 0;
 251         level = stsi_0();
 252         if (level >= 1)
 253                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 254
 255         if (level >= 1)
 256                 len = stsi_15_1_x((struct sysinfo_15_1_x *) info, page, len);
 257
 258         if (level >= 1)
 259                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 260
 261         if (level >= 2)
 262                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 263
 264         if (level >= 3)
 265                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 266
 267         free_page(info);
 268         return len;
 269 }
 270
 271 static __init int create_proc_sysinfo(void)
 272 {
 273         create_proc_read_entry("sysinfo", 0444, NULL,
 274                                proc_read_sysinfo, NULL);
 275         return 0;
 276 }
 277 device_initcall(create_proc_sysinfo);
 278
 279 /*
 280  * Service levels interface.
 281  */
 282
 283 static DECLARE_RWSEM(service_level_sem);
 284 static LIST_HEAD(service_level_list);
 285
 286 int register_service_level(struct service_level *slr)
 287 {
 288         struct service_level *ptr;
 289
 290         down_write(&service_level_sem);
 291         list_for_each_entry(ptr, &service_level_list, list)
 292                 if (ptr == slr) {
 293                         up_write(&service_level_sem);
 294                         return -EEXIST;
 295                 }
 296         list_add_tail(&slr->list, &service_level_list);
 297         up_write(&service_level_sem);
 298         return 0;
 299 }
 300 EXPORT_SYMBOL(register_service_level);
 301
 302 int unregister_service_level(struct service_level *slr)
 303 {
 304         struct service_level *ptr, *next;
 305         int rc = -ENOENT;
 306
 307         down_write(&service_level_sem);
 308         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 309                 if (ptr != slr)
 310                         continue;
 311                 list_del(&ptr->list);
 312                 rc = 0;
 313                 break;
 314         }
 315         up_write(&service_level_sem);
 316         return rc;
 317 }
 318 EXPORT_SYMBOL(unregister_service_level);
 319
 320 static void *service_level_start(struct seq_file *m, loff_t *pos)
 321 {
 322         down_read(&service_level_sem);
 323         return seq_list_start(&service_level_list, *pos);
 324 }
 325
 326 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 327 {
 328         return seq_list_next(p, &service_level_list, pos);
 329 }
 330
 331 static void service_level_stop(struct seq_file *m, void *p)
 332 {
 333         up_read(&service_level_sem);
 334 }
 335
 336 static int service_level_show(struct seq_file *m, void *p)
 337 {
 338         struct service_level *slr;
 339
 340         slr = list_entry(p, struct service_level, list);
 341         slr->seq_print(m, slr);
 342         return 0;
 343 }
 344
 345 static const struct seq_operations service_level_seq_ops = {
 346         .start          = service_level_start,
 347         .next           = service_level_next,
 348         .stop           = service_level_stop,
 349         .show           = service_level_show
 350 };
 351
 352 static int service_level_open(struct inode *inode, struct file *file)
 353 {
 354         return seq_open(file, &service_level_seq_ops);
 355 }
 356
 357 static const struct file_operations service_level_ops = {
 358         .open           = service_level_open,
 359         .read           = seq_read,
 360         .llseek         = seq_lseek,
 361         .release        = seq_release
 362 };
 363
 364 static void service_level_vm_print(struct seq_file *m,
 365                                    struct service_level *slr)
 366 {
 367         char *query_buffer, *str;
 368
 369         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 370         if (!query_buffer)
 371                 return;
 372         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 373         str = strchr(query_buffer, '\n');
 374         if (str)
 375                 *str = 0;
 376         seq_printf(m, "VM: %s\n", query_buffer);
 377         kfree(query_buffer);
 378 }
 379
 380 static struct service_level service_level_vm = {
 381         .seq_print = service_level_vm_print
 382 };
 383
 384 static __init int create_proc_service_level(void)
 385 {
 386         proc_create("service_levels", 0, NULL, &service_level_ops);
 387         if (MACHINE_IS_VM)
 388                 register_service_level(&service_level_vm);
 389         return 0;
 390 }
 391 subsys_initcall(create_proc_service_level);
 392
 393 /*
 394  * Bogomips calculation based on cpu capability.
 395  */
 396 int get_cpu_capability(unsigned int *capability)
 397 {
 398         struct sysinfo_1_2_2 *info;
 399         int rc;
 400
 401         info = (void *) get_zeroed_page(GFP_KERNEL);
 402         if (!info)
 403                 return -ENOMEM;
 404         rc = stsi(info, 1, 2, 2);
 405         if (rc == -ENOSYS)
 406                 goto out;
 407         rc = 0;
 408         *capability = info->capability;
 409 out:
 410         free_page((unsigned long) info);
 411         return rc;
 412 }
 413
 414 /*
 415  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 416  */
 417 void s390_adjust_jiffies(void)
 418 {
 419         struct sysinfo_1_2_2 *info;
 420         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 421         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 422         FP_DECL_EX;
 423         unsigned int capability;
 424
 425         info = (void *) get_zeroed_page(GFP_KERNEL);
 426         if (!info)
 427                 return;
 428
 429         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 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 .. math-emu here we come :-)
 440                  */
 441                 FP_UNPACK_SP(SA, &fmil);
 442                 if ((info->capability >> 23) == 0)
 443                         FP_FROM_INT_S(SB, info->capability, 32, int);
 444                 else
 445                         FP_UNPACK_SP(SB, &info->capability);
 446                 FP_DIV_S(SR, SA, SB);
 447                 FP_TO_INT_S(capability, SR, 32, 0);
 448         } else
 449                 /*
 450                  * Really old machine without stsi block for basic
 451                  * cpu information. Report 42.0 bogomips.
 452                  */
 453                 capability = 42;
 454         loops_per_jiffy = capability * (500000/HZ);
 455         free_page((unsigned long) info);
 456 }
 457
 458 /*
 459  * calibrate the delay loop
 460  */
 461 void __cpuinit calibrate_delay(void)
 462 {
 463         s390_adjust_jiffies();
 464         /* Print the good old Bogomips line .. */
 465         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 466                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 467                (loops_per_jiffy/(5000/HZ)) % 100);
 468 }