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/export.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 #include <asm/fpu/api.h>
  20
  21 int topology_max_mnest;
  22
  23 static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
  24 {
  25         register int r0 asm("0") = (fc << 28) | sel1;
  26         register int r1 asm("1") = sel2;
  27         int rc = 0;
  28
  29         asm volatile(
  30                 "       stsi    0(%3)\n"
  31                 "0:     jz      2f\n"
  32                 "1:     lhi     %1,%4\n"
  33                 "2:\n"
  34                 EX_TABLE(0b, 1b)
  35                 : "+d" (r0), "+d" (rc)
  36                 : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
  37                 : "cc", "memory");
  38         *lvl = ((unsigned int) r0) >> 28;
  39         return rc;
  40 }
  41
  42 /*
  43  * stsi - store system information
  44  *
  45  * Returns the current configuration level if function code 0 was specified.
  46  * Otherwise returns 0 on success or a negative value on error.
  47  */
  48 int stsi(void *sysinfo, int fc, int sel1, int sel2)
  49 {
  50         int lvl, rc;
  51
  52         rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
  53         if (rc)
  54                 return rc;
  55         return fc ? 0 : lvl;
  56 }
  57 EXPORT_SYMBOL(stsi);
  58
  59 static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  60 {
  61         switch (encoding) {
  62         case 1: /* EBCDIC */
  63                 EBCASC(name, len);
  64                 break;
  65         case 2: /* UTF-8 */
  66                 break;
  67         default:
  68                 return false;
  69         }
  70         return true;
  71 }
  72
  73 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  74 {
  75         int i;
  76
  77         if (stsi(info, 1, 1, 1))
  78                 return;
  79         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  80         EBCASC(info->type, sizeof(info->type));
  81         EBCASC(info->model, sizeof(info->model));
  82         EBCASC(info->sequence, sizeof(info->sequence));
  83         EBCASC(info->plant, sizeof(info->plant));
  84         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  85         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  86         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  87         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  88         seq_printf(m, "Type:                 %-4.4s\n", info->type);
  89         /*
  90          * Sigh: the model field has been renamed with System z9
  91          * to model_capacity and a new model field has been added
  92          * after the plant field. To avoid confusing older programs
  93          * the "Model:" prints "model_capacity model" or just
  94          * "model_capacity" if the model string is empty .
  95          */
  96         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
  97         if (info->model[0] != '\0')
  98                 seq_printf(m, " %-16.16s", info->model);
  99         seq_putc(m, '\n');
 100         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 101         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 102         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 103                    info->model_capacity, info->model_cap_rating);
 104         if (info->model_perm_cap_rating)
 105                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 106                            info->model_perm_cap,
 107                            info->model_perm_cap_rating);
 108         if (info->model_temp_cap_rating)
 109                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 110                            info->model_temp_cap,
 111                            info->model_temp_cap_rating);
 112         if (info->ncr)
 113                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 114         if (info->npr)
 115                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 116         if (info->ntr)
 117                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 118         if (info->cai) {
 119                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 120                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 121                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 122         }
 123         if (info->p) {
 124                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 125                         seq_printf(m, "Type %d Percentage:    %d\n",
 126                                    i, info->typepct[i - 1]);
 127                 }
 128         }
 129 }
 130
 131 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 132 {
 133         int i;
 134
 135         seq_putc(m, '\n');
 136         if (!MACHINE_HAS_TOPOLOGY)
 137                 return;
 138         if (stsi(info, 15, 1, topology_max_mnest))
 139                 return;
 140         seq_printf(m, "CPU Topology HW:     ");
 141         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 142                 seq_printf(m, " %d", info->mag[i]);
 143         seq_putc(m, '\n');
 144 #ifdef CONFIG_SCHED_TOPOLOGY
 145         store_topology(info);
 146         seq_printf(m, "CPU Topology SW:     ");
 147         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 148                 seq_printf(m, " %d", info->mag[i]);
 149         seq_putc(m, '\n');
 150 #endif
 151 }
 152
 153 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 154 {
 155         struct sysinfo_1_2_2_extension *ext;
 156         int i;
 157
 158         if (stsi(info, 1, 2, 2))
 159                 return;
 160         ext = (struct sysinfo_1_2_2_extension *)
 161                 ((unsigned long) info + info->acc_offset);
 162         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 163         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 164         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 165         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 166         if (info->mt_installed) {
 167                 seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 168                 seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 169         }
 170         /*
 171          * Sigh 2. According to the specification the alternate
 172          * capability field is a 32 bit floating point number
 173          * if the higher order 8 bits are not zero. Printing
 174          * a floating point number in the kernel is a no-no,
 175          * always print the number as 32 bit unsigned integer.
 176          * The user-space needs to know about the strange
 177          * encoding of the alternate cpu capability.
 178          */
 179         seq_printf(m, "Capability:           %u", info->capability);
 180         if (info->format == 1)
 181                 seq_printf(m, " %u", ext->alt_capability);
 182         seq_putc(m, '\n');
 183         if (info->nominal_cap)
 184                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 185         if (info->secondary_cap)
 186                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 187         for (i = 2; i <= info->cpus_total; i++) {
 188                 seq_printf(m, "Adjustment %02d-way:    %u",
 189                            i, info->adjustment[i-2]);
 190                 if (info->format == 1)
 191                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 192                 seq_putc(m, '\n');
 193         }
 194 }
 195
 196 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 197 {
 198         if (stsi(info, 2, 2, 2))
 199                 return;
 200         EBCASC(info->name, sizeof(info->name));
 201         seq_putc(m, '\n');
 202         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 203         seq_printf(m, "LPAR Characteristics: ");
 204         if (info->characteristics & LPAR_CHAR_DEDICATED)
 205                 seq_printf(m, "Dedicated ");
 206         if (info->characteristics & LPAR_CHAR_SHARED)
 207                 seq_printf(m, "Shared ");
 208         if (info->characteristics & LPAR_CHAR_LIMITED)
 209                 seq_printf(m, "Limited ");
 210         seq_putc(m, '\n');
 211         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 212         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 213         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 214         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 215         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 216         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 217         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 218         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 219         if (info->mt_installed) {
 220                 seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 221                 seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 222                 seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 223         }
 224         if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 225                 seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 226                 seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 227         }
 228 }
 229
 230 static void print_ext_name(struct seq_file *m, int lvl,
 231                            struct sysinfo_3_2_2 *info)
 232 {
 233         size_t len = sizeof(info->ext_names[lvl]);
 234
 235         if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 236                 return;
 237         seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 238                    info->ext_names[lvl]);
 239 }
 240
 241 static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 242 {
 243         if (!memcmp(&info->vm[i].uuid, &NULL_UUID_BE, sizeof(uuid_be)))
 244                 return;
 245         seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 246 }
 247
 248 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 249 {
 250         int i;
 251
 252         if (stsi(info, 3, 2, 2))
 253                 return;
 254         for (i = 0; i < info->count; i++) {
 255                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 256                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 257                 seq_putc(m, '\n');
 258                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 259                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 260                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 261                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 262                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 263                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 264                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 265                 print_ext_name(m, i, info);
 266                 print_uuid(m, i, info);
 267         }
 268 }
 269
 270 static int sysinfo_show(struct seq_file *m, void *v)
 271 {
 272         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 273         int level;
 274
 275         if (!info)
 276                 return 0;
 277         level = stsi(NULL, 0, 0, 0);
 278         if (level >= 1)
 279                 stsi_1_1_1(m, info);
 280         if (level >= 1)
 281                 stsi_15_1_x(m, info);
 282         if (level >= 1)
 283                 stsi_1_2_2(m, info);
 284         if (level >= 2)
 285                 stsi_2_2_2(m, info);
 286         if (level >= 3)
 287                 stsi_3_2_2(m, info);
 288         free_page((unsigned long)info);
 289         return 0;
 290 }
 291
 292 static int sysinfo_open(struct inode *inode, struct file *file)
 293 {
 294         return single_open(file, sysinfo_show, NULL);
 295 }
 296
 297 static const struct file_operations sysinfo_fops = {
 298         .open           = sysinfo_open,
 299         .read           = seq_read,
 300         .llseek         = seq_lseek,
 301         .release        = single_release,
 302 };
 303
 304 static int __init sysinfo_create_proc(void)
 305 {
 306         proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
 307         return 0;
 308 }
 309 device_initcall(sysinfo_create_proc);
 310
 311 /*
 312  * Service levels interface.
 313  */
 314
 315 static DECLARE_RWSEM(service_level_sem);
 316 static LIST_HEAD(service_level_list);
 317
 318 int register_service_level(struct service_level *slr)
 319 {
 320         struct service_level *ptr;
 321
 322         down_write(&service_level_sem);
 323         list_for_each_entry(ptr, &service_level_list, list)
 324                 if (ptr == slr) {
 325                         up_write(&service_level_sem);
 326                         return -EEXIST;
 327                 }
 328         list_add_tail(&slr->list, &service_level_list);
 329         up_write(&service_level_sem);
 330         return 0;
 331 }
 332 EXPORT_SYMBOL(register_service_level);
 333
 334 int unregister_service_level(struct service_level *slr)
 335 {
 336         struct service_level *ptr, *next;
 337         int rc = -ENOENT;
 338
 339         down_write(&service_level_sem);
 340         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 341                 if (ptr != slr)
 342                         continue;
 343                 list_del(&ptr->list);
 344                 rc = 0;
 345                 break;
 346         }
 347         up_write(&service_level_sem);
 348         return rc;
 349 }
 350 EXPORT_SYMBOL(unregister_service_level);
 351
 352 static void *service_level_start(struct seq_file *m, loff_t *pos)
 353 {
 354         down_read(&service_level_sem);
 355         return seq_list_start(&service_level_list, *pos);
 356 }
 357
 358 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 359 {
 360         return seq_list_next(p, &service_level_list, pos);
 361 }
 362
 363 static void service_level_stop(struct seq_file *m, void *p)
 364 {
 365         up_read(&service_level_sem);
 366 }
 367
 368 static int service_level_show(struct seq_file *m, void *p)
 369 {
 370         struct service_level *slr;
 371
 372         slr = list_entry(p, struct service_level, list);
 373         slr->seq_print(m, slr);
 374         return 0;
 375 }
 376
 377 static const struct seq_operations service_level_seq_ops = {
 378         .start          = service_level_start,
 379         .next           = service_level_next,
 380         .stop           = service_level_stop,
 381         .show           = service_level_show
 382 };
 383
 384 static int service_level_open(struct inode *inode, struct file *file)
 385 {
 386         return seq_open(file, &service_level_seq_ops);
 387 }
 388
 389 static const struct file_operations service_level_ops = {
 390         .open           = service_level_open,
 391         .read           = seq_read,
 392         .llseek         = seq_lseek,
 393         .release        = seq_release
 394 };
 395
 396 static void service_level_vm_print(struct seq_file *m,
 397                                    struct service_level *slr)
 398 {
 399         char *query_buffer, *str;
 400
 401         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 402         if (!query_buffer)
 403                 return;
 404         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 405         str = strchr(query_buffer, '\n');
 406         if (str)
 407                 *str = 0;
 408         seq_printf(m, "VM: %s\n", query_buffer);
 409         kfree(query_buffer);
 410 }
 411
 412 static struct service_level service_level_vm = {
 413         .seq_print = service_level_vm_print
 414 };
 415
 416 static __init int create_proc_service_level(void)
 417 {
 418         proc_create("service_levels", 0, NULL, &service_level_ops);
 419         if (MACHINE_IS_VM)
 420                 register_service_level(&service_level_vm);
 421         return 0;
 422 }
 423 subsys_initcall(create_proc_service_level);
 424
 425 /*
 426  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 427  */
 428 void s390_adjust_jiffies(void)
 429 {
 430         struct sysinfo_1_2_2 *info;
 431         unsigned long capability;
 432         struct kernel_fpu fpu;
 433
 434         info = (void *) get_zeroed_page(GFP_KERNEL);
 435         if (!info)
 436                 return;
 437
 438         if (stsi(info, 1, 2, 2) == 0) {
 439                 /*
 440                  * Major sigh. The cpu capability encoding is "special".
 441                  * If the first 9 bits of info->capability are 0 then it
 442                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 443                  * If the first 9 bits are != 0 then it is a 32 bit float.
 444                  * In addition a lower value indicates a proportionally
 445                  * higher cpu capacity. Bogomips are the other way round.
 446                  * To get to a halfway suitable number we divide 1e7
 447                  * by the cpu capability number. Yes, that means a floating
 448                  * point division ..
 449                  */
 450                 kernel_fpu_begin(&fpu, KERNEL_FPR);
 451                 asm volatile(
 452                         "       sfpc    %3\n"
 453                         "       l       %0,%1\n"
 454                         "       tmlh    %0,0xff80\n"
 455                         "       jnz     0f\n"
 456                         "       cefbr   %%f2,%0\n"
 457                         "       j       1f\n"
 458                         "0:     le      %%f2,%1\n"
 459                         "1:     cefbr   %%f0,%2\n"
 460                         "       debr    %%f0,%%f2\n"
 461                         "       cgebr   %0,5,%%f0\n"
 462                         : "=&d" (capability)
 463                         : "Q" (info->capability), "d" (10000000), "d" (0)
 464                         : "cc"
 465                         );
 466                 kernel_fpu_end(&fpu, KERNEL_FPR);
 467         } else
 468                 /*
 469                  * Really old machine without stsi block for basic
 470                  * cpu information. Report 42.0 bogomips.
 471                  */
 472                 capability = 42;
 473         loops_per_jiffy = capability * (500000/HZ);
 474         free_page((unsigned long) info);
 475 }
 476
 477 /*
 478  * calibrate the delay loop
 479  */
 480 void calibrate_delay(void)
 481 {
 482         s390_adjust_jiffies();
 483         /* Print the good old Bogomips line .. */
 484         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 485                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 486                (loops_per_jiffy/(5000/HZ)) % 100);
 487 }