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 <asm/ebcdic.h>
  15 #include <asm/sysinfo.h>
  16 #include <asm/cpcmd.h>
  17
  18 /* Sigh, math-emu. Don't ask. */
  19 #include <asm/sfp-util.h>
  20 #include <math-emu/soft-fp.h>
  21 #include <math-emu/single.h>
  22
  23 static inline int stsi_0(void)
  24 {
  25         int rc = stsi(NULL, 0, 0, 0);
  26         return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
  27 }
  28
  29 static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
  30 {
  31         if (stsi(info, 1, 1, 1) == -ENOSYS)
  32                 return len;
  33
  34         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  35         EBCASC(info->type, sizeof(info->type));
  36         EBCASC(info->model, sizeof(info->model));
  37         EBCASC(info->sequence, sizeof(info->sequence));
  38         EBCASC(info->plant, sizeof(info->plant));
  39         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  40         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  41         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  42         len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
  43                        info->manufacturer);
  44         len += sprintf(page + len, "Type:                 %-4.4s\n",
  45                        info->type);
  46         if (info->model[0] != '\0')
  47                 /*
  48                  * Sigh: the model field has been renamed with System z9
  49                  * to model_capacity and a new model field has been added
  50                  * after the plant field. To avoid confusing older programs
  51                  * the "Model:" prints "model_capacity model" or just
  52                  * "model_capacity" if the model string is empty .
  53                  */
  54                 len += sprintf(page + len,
  55                                "Model:                %-16.16s %-16.16s\n",
  56                                info->model_capacity, info->model);
  57         else
  58                 len += sprintf(page + len, "Model:                %-16.16s\n",
  59                                info->model_capacity);
  60         len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
  61                        info->sequence);
  62         len += sprintf(page + len, "Plant:                %-4.4s\n",
  63                        info->plant);
  64         len += sprintf(page + len, "Model Capacity:       %-16.16s %08u\n",
  65                        info->model_capacity, *(u32 *) info->model_cap_rating);
  66         if (info->model_perm_cap[0] != '\0')
  67                 len += sprintf(page + len,
  68                                "Model Perm. Capacity: %-16.16s %08u\n",
  69                                info->model_perm_cap,
  70                                *(u32 *) info->model_perm_cap_rating);
  71         if (info->model_temp_cap[0] != '\0')
  72                 len += sprintf(page + len,
  73                                "Model Temp. Capacity: %-16.16s %08u\n",
  74                                info->model_temp_cap,
  75                                *(u32 *) info->model_temp_cap_rating);
  76         return len;
  77 }
  78
  79 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
  80 {
  81         struct sysinfo_1_2_2_extension *ext;
  82         int i;
  83
  84         if (stsi(info, 1, 2, 2) == -ENOSYS)
  85                 return len;
  86         ext = (struct sysinfo_1_2_2_extension *)
  87                 ((unsigned long) info + info->acc_offset);
  88
  89         len += sprintf(page + len, "\n");
  90         len += sprintf(page + len, "CPUs Total:           %d\n",
  91                        info->cpus_total);
  92         len += sprintf(page + len, "CPUs Configured:      %d\n",
  93                        info->cpus_configured);
  94         len += sprintf(page + len, "CPUs Standby:         %d\n",
  95                        info->cpus_standby);
  96         len += sprintf(page + len, "CPUs Reserved:        %d\n",
  97                        info->cpus_reserved);
  98
  99         if (info->format == 1) {
 100                 /*
 101                  * Sigh 2. According to the specification the alternate
 102                  * capability field is a 32 bit floating point number
 103                  * if the higher order 8 bits are not zero. Printing
 104                  * a floating point number in the kernel is a no-no,
 105                  * always print the number as 32 bit unsigned integer.
 106                  * The user-space needs to know about the strange
 107                  * encoding of the alternate cpu capability.
 108                  */
 109                 len += sprintf(page + len, "Capability:           %u %u\n",
 110                                info->capability, ext->alt_capability);
 111                 for (i = 2; i <= info->cpus_total; i++)
 112                         len += sprintf(page + len,
 113                                        "Adjustment %02d-way:    %u %u\n",
 114                                        i, info->adjustment[i-2],
 115                                        ext->alt_adjustment[i-2]);
 116
 117         } else {
 118                 len += sprintf(page + len, "Capability:           %u\n",
 119                                info->capability);
 120                 for (i = 2; i <= info->cpus_total; i++)
 121                         len += sprintf(page + len,
 122                                        "Adjustment %02d-way:    %u\n",
 123                                        i, info->adjustment[i-2]);
 124         }
 125
 126         if (info->secondary_capability != 0)
 127                 len += sprintf(page + len, "Secondary Capability: %d\n",
 128                                info->secondary_capability);
 129         return len;
 130 }
 131
 132 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 133 {
 134         if (stsi(info, 2, 2, 2) == -ENOSYS)
 135                 return len;
 136
 137         EBCASC(info->name, sizeof(info->name));
 138
 139         len += sprintf(page + len, "\n");
 140         len += sprintf(page + len, "LPAR Number:          %d\n",
 141                        info->lpar_number);
 142
 143         len += sprintf(page + len, "LPAR Characteristics: ");
 144         if (info->characteristics & LPAR_CHAR_DEDICATED)
 145                 len += sprintf(page + len, "Dedicated ");
 146         if (info->characteristics & LPAR_CHAR_SHARED)
 147                 len += sprintf(page + len, "Shared ");
 148         if (info->characteristics & LPAR_CHAR_LIMITED)
 149                 len += sprintf(page + len, "Limited ");
 150         len += sprintf(page + len, "\n");
 151
 152         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 153                        info->name);
 154
 155         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 156                        info->caf);
 157
 158         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 159                        info->cpus_total);
 160         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 161                        info->cpus_configured);
 162         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 163                        info->cpus_standby);
 164         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 165                        info->cpus_reserved);
 166         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 167                        info->cpus_dedicated);
 168         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 169                        info->cpus_shared);
 170         return len;
 171 }
 172
 173 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 174 {
 175         int i;
 176
 177         if (stsi(info, 3, 2, 2) == -ENOSYS)
 178                 return len;
 179         for (i = 0; i < info->count; i++) {
 180                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 181                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 182                 len += sprintf(page + len, "\n");
 183                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 184                                i, info->vm[i].name);
 185                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 186                                i, info->vm[i].cpi);
 187
 188                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 189                                i, info->vm[i].caf);
 190
 191                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 192                                i, info->vm[i].cpus_total);
 193                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 194                                i, info->vm[i].cpus_configured);
 195                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 196                                i, info->vm[i].cpus_standby);
 197                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 198                                i, info->vm[i].cpus_reserved);
 199         }
 200         return len;
 201 }
 202
 203 static int proc_read_sysinfo(char *page, char **start,
 204                              off_t off, int count,
 205                              int *eof, void *data)
 206 {
 207         unsigned long info = get_zeroed_page(GFP_KERNEL);
 208         int level, len;
 209
 210         if (!info)
 211                 return 0;
 212
 213         len = 0;
 214         level = stsi_0();
 215         if (level >= 1)
 216                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 217
 218         if (level >= 1)
 219                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 220
 221         if (level >= 2)
 222                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 223
 224         if (level >= 3)
 225                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 226
 227         free_page(info);
 228         return len;
 229 }
 230
 231 static __init int create_proc_sysinfo(void)
 232 {
 233         create_proc_read_entry("sysinfo", 0444, NULL,
 234                                proc_read_sysinfo, NULL);
 235         return 0;
 236 }
 237 device_initcall(create_proc_sysinfo);
 238
 239 /*
 240  * Service levels interface.
 241  */
 242
 243 static DECLARE_RWSEM(service_level_sem);
 244 static LIST_HEAD(service_level_list);
 245
 246 int register_service_level(struct service_level *slr)
 247 {
 248         struct service_level *ptr;
 249
 250         down_write(&service_level_sem);
 251         list_for_each_entry(ptr, &service_level_list, list)
 252                 if (ptr == slr) {
 253                         up_write(&service_level_sem);
 254                         return -EEXIST;
 255                 }
 256         list_add_tail(&slr->list, &service_level_list);
 257         up_write(&service_level_sem);
 258         return 0;
 259 }
 260 EXPORT_SYMBOL(register_service_level);
 261
 262 int unregister_service_level(struct service_level *slr)
 263 {
 264         struct service_level *ptr, *next;
 265         int rc = -ENOENT;
 266
 267         down_write(&service_level_sem);
 268         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 269                 if (ptr != slr)
 270                         continue;
 271                 list_del(&ptr->list);
 272                 rc = 0;
 273                 break;
 274         }
 275         up_write(&service_level_sem);
 276         return rc;
 277 }
 278 EXPORT_SYMBOL(unregister_service_level);
 279
 280 static void *service_level_start(struct seq_file *m, loff_t *pos)
 281 {
 282         down_read(&service_level_sem);
 283         return seq_list_start(&service_level_list, *pos);
 284 }
 285
 286 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 287 {
 288         return seq_list_next(p, &service_level_list, pos);
 289 }
 290
 291 static void service_level_stop(struct seq_file *m, void *p)
 292 {
 293         up_read(&service_level_sem);
 294 }
 295
 296 static int service_level_show(struct seq_file *m, void *p)
 297 {
 298         struct service_level *slr;
 299
 300         slr = list_entry(p, struct service_level, list);
 301         slr->seq_print(m, slr);
 302         return 0;
 303 }
 304
 305 static const struct seq_operations service_level_seq_ops = {
 306         .start          = service_level_start,
 307         .next           = service_level_next,
 308         .stop           = service_level_stop,
 309         .show           = service_level_show
 310 };
 311
 312 static int service_level_open(struct inode *inode, struct file *file)
 313 {
 314         return seq_open(file, &service_level_seq_ops);
 315 }
 316
 317 static const struct file_operations service_level_ops = {
 318         .open           = service_level_open,
 319         .read           = seq_read,
 320         .llseek         = seq_lseek,
 321         .release        = seq_release
 322 };
 323
 324 static void service_level_vm_print(struct seq_file *m,
 325                                    struct service_level *slr)
 326 {
 327         char *query_buffer, *str;
 328
 329         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 330         if (!query_buffer)
 331                 return;
 332         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 333         str = strchr(query_buffer, '\n');
 334         if (str)
 335                 *str = 0;
 336         seq_printf(m, "VM: %s\n", query_buffer);
 337         kfree(query_buffer);
 338 }
 339
 340 static struct service_level service_level_vm = {
 341         .seq_print = service_level_vm_print
 342 };
 343
 344 static __init int create_proc_service_level(void)
 345 {
 346         proc_create("service_levels", 0, NULL, &service_level_ops);
 347         if (MACHINE_IS_VM)
 348                 register_service_level(&service_level_vm);
 349         return 0;
 350 }
 351 subsys_initcall(create_proc_service_level);
 352
 353 /*
 354  * Bogomips calculation based on cpu capability.
 355  */
 356 int get_cpu_capability(unsigned int *capability)
 357 {
 358         struct sysinfo_1_2_2 *info;
 359         int rc;
 360
 361         info = (void *) get_zeroed_page(GFP_KERNEL);
 362         if (!info)
 363                 return -ENOMEM;
 364         rc = stsi(info, 1, 2, 2);
 365         if (rc == -ENOSYS)
 366                 goto out;
 367         rc = 0;
 368         *capability = info->capability;
 369 out:
 370         free_page((unsigned long) info);
 371         return rc;
 372 }
 373
 374 /*
 375  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 376  */
 377 void s390_adjust_jiffies(void)
 378 {
 379         struct sysinfo_1_2_2 *info;
 380         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 381         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 382         FP_DECL_EX;
 383         unsigned int capability;
 384
 385         info = (void *) get_zeroed_page(GFP_KERNEL);
 386         if (!info)
 387                 return;
 388
 389         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 390                 /*
 391                  * Major sigh. The cpu capability encoding is "special".
 392                  * If the first 9 bits of info->capability are 0 then it
 393                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 394                  * If the first 9 bits are != 0 then it is a 32 bit float.
 395                  * In addition a lower value indicates a proportionally
 396                  * higher cpu capacity. Bogomips are the other way round.
 397                  * To get to a halfway suitable number we divide 1e7
 398                  * by the cpu capability number. Yes, that means a floating
 399                  * point division .. math-emu here we come :-)
 400                  */
 401                 FP_UNPACK_SP(SA, &fmil);
 402                 if ((info->capability >> 23) == 0)
 403                         FP_FROM_INT_S(SB, info->capability, 32, int);
 404                 else
 405                         FP_UNPACK_SP(SB, &info->capability);
 406                 FP_DIV_S(SR, SA, SB);
 407                 FP_TO_INT_S(capability, SR, 32, 0);
 408         } else
 409                 /*
 410                  * Really old machine without stsi block for basic
 411                  * cpu information. Report 42.0 bogomips.
 412                  */
 413                 capability = 42;
 414         loops_per_jiffy = capability * (500000/HZ);
 415         free_page((unsigned long) info);
 416 }
 417
 418 /*
 419  * calibrate the delay loop
 420  */
 421 void __cpuinit calibrate_delay(void)
 422 {
 423         s390_adjust_jiffies();
 424         /* Print the good old Bogomips line .. */
 425         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 426                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 427                (loops_per_jiffy/(5000/HZ)) % 100);
 428 }