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