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