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   1 /*
   2  *  drivers/s390/sysinfo.c
   3  *
   4  *    Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
   5  *    Author(s): Ulrich Weigand (Ulrich.Weigand@de.ibm.com)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <asm/ebcdic.h>
  14
  15 /* Sigh, math-emu. Don't ask. */
  16 #include <asm/sfp-util.h>
  17 #include <math-emu/soft-fp.h>
  18 #include <math-emu/single.h>
  19
  20 struct sysinfo_1_1_1 {
  21         char reserved_0[32];
  22         char manufacturer[16];
  23         char type[4];
  24         char reserved_1[12];
  25         char model_capacity[16];
  26         char sequence[16];
  27         char plant[4];
  28         char model[16];
  29 };
  30
  31 struct sysinfo_1_2_1 {
  32         char reserved_0[80];
  33         char sequence[16];
  34         char plant[4];
  35         char reserved_1[2];
  36         unsigned short cpu_address;
  37 };
  38
  39 struct sysinfo_1_2_2 {
  40         char format;
  41         char reserved_0[1];
  42         unsigned short acc_offset;
  43         char reserved_1[24];
  44         unsigned int secondary_capability;
  45         unsigned int capability;
  46         unsigned short cpus_total;
  47         unsigned short cpus_configured;
  48         unsigned short cpus_standby;
  49         unsigned short cpus_reserved;
  50         unsigned short adjustment[0];
  51 };
  52
  53 struct sysinfo_1_2_2_extension {
  54         unsigned int alt_capability;
  55         unsigned short alt_adjustment[0];
  56 };
  57
  58 struct sysinfo_2_2_1 {
  59         char reserved_0[80];
  60         char sequence[16];
  61         char plant[4];
  62         unsigned short cpu_id;
  63         unsigned short cpu_address;
  64 };
  65
  66 struct sysinfo_2_2_2 {
  67         char reserved_0[32];
  68         unsigned short lpar_number;
  69         char reserved_1;
  70         unsigned char characteristics;
  71         unsigned short cpus_total;
  72         unsigned short cpus_configured;
  73         unsigned short cpus_standby;
  74         unsigned short cpus_reserved;
  75         char name[8];
  76         unsigned int caf;
  77         char reserved_2[16];
  78         unsigned short cpus_dedicated;
  79         unsigned short cpus_shared;
  80 };
  81
  82 #define LPAR_CHAR_DEDICATED     (1 << 7)
  83 #define LPAR_CHAR_SHARED        (1 << 6)
  84 #define LPAR_CHAR_LIMITED       (1 << 5)
  85
  86 struct sysinfo_3_2_2 {
  87         char reserved_0[31];
  88         unsigned char count;
  89         struct {
  90                 char reserved_0[4];
  91                 unsigned short cpus_total;
  92                 unsigned short cpus_configured;
  93                 unsigned short cpus_standby;
  94                 unsigned short cpus_reserved;
  95                 char name[8];
  96                 unsigned int caf;
  97                 char cpi[16];
  98                 char reserved_1[24];
  99
 100         } vm[8];
 101 };
 102
 103 static inline int stsi(void *sysinfo, int fc, int sel1, int sel2)
 104 {
 105         register int r0 asm("0") = (fc << 28) | sel1;
 106         register int r1 asm("1") = sel2;
 107
 108         asm volatile(
 109                 "   stsi 0(%2)\n"
 110                 "0: jz   2f\n"
 111                 "1: lhi  %0,%3\n"
 112                 "2:\n"
 113                 EX_TABLE(0b,1b)
 114                 : "+d" (r0) : "d" (r1), "a" (sysinfo), "K" (-ENOSYS)
 115                 : "cc", "memory" );
 116         return r0;
 117 }
 118
 119 static inline int stsi_0(void)
 120 {
 121         int rc = stsi (NULL, 0, 0, 0);
 122         return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
 123 }
 124
 125 static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
 126 {
 127         if (stsi(info, 1, 1, 1) == -ENOSYS)
 128                 return len;
 129
 130         EBCASC(info->manufacturer, sizeof(info->manufacturer));
 131         EBCASC(info->type, sizeof(info->type));
 132         EBCASC(info->model, sizeof(info->model));
 133         EBCASC(info->sequence, sizeof(info->sequence));
 134         EBCASC(info->plant, sizeof(info->plant));
 135         EBCASC(info->model_capacity, sizeof(info->model_capacity));
 136         len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
 137                        info->manufacturer);
 138         len += sprintf(page + len, "Type:                 %-4.4s\n",
 139                        info->type);
 140         if (info->model[0] != '\0')
 141                 /*
 142                  * Sigh: the model field has been renamed with System z9
 143                  * to model_capacity and a new model field has been added
 144                  * after the plant field. To avoid confusing older programs
 145                  * the "Model:" prints "model_capacity model" or just
 146                  * "model_capacity" if the model string is empty .
 147                  */
 148                 len += sprintf(page + len,
 149                                "Model:                %-16.16s %-16.16s\n",
 150                                info->model_capacity, info->model);
 151         else
 152                 len += sprintf(page + len, "Model:                %-16.16s\n",
 153                                info->model_capacity);
 154         len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
 155                        info->sequence);
 156         len += sprintf(page + len, "Plant:                %-4.4s\n",
 157                        info->plant);
 158         len += sprintf(page + len, "Model Capacity:       %-16.16s\n",
 159                        info->model_capacity);
 160         return len;
 161 }
 162
 163 #if 0 /* Currently unused */
 164 static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
 165 {
 166         if (stsi(info, 1, 2, 1) == -ENOSYS)
 167                 return len;
 168
 169         len += sprintf(page + len, "\n");
 170         EBCASC(info->sequence, sizeof(info->sequence));
 171         EBCASC(info->plant, sizeof(info->plant));
 172         len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
 173                        info->sequence);
 174         len += sprintf(page + len, "Plant of CPU:         %-16.16s\n",
 175                        info->plant);
 176         return len;
 177 }
 178 #endif
 179
 180 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
 181 {
 182         struct sysinfo_1_2_2_extension *ext;
 183         int i;
 184
 185         if (stsi(info, 1, 2, 2) == -ENOSYS)
 186                 return len;
 187         ext = (struct sysinfo_1_2_2_extension *)
 188                 ((unsigned long) info + info->acc_offset);
 189
 190         len += sprintf(page + len, "\n");
 191         len += sprintf(page + len, "CPUs Total:           %d\n",
 192                        info->cpus_total);
 193         len += sprintf(page + len, "CPUs Configured:      %d\n",
 194                        info->cpus_configured);
 195         len += sprintf(page + len, "CPUs Standby:         %d\n",
 196                        info->cpus_standby);
 197         len += sprintf(page + len, "CPUs Reserved:        %d\n",
 198                        info->cpus_reserved);
 199
 200         if (info->format == 1) {
 201                 /*
 202                  * Sigh 2. According to the specification the alternate
 203                  * capability field is a 32 bit floating point number
 204                  * if the higher order 8 bits are not zero. Printing
 205                  * a floating point number in the kernel is a no-no,
 206                  * always print the number as 32 bit unsigned integer.
 207                  * The user-space needs to know about the strange
 208                  * encoding of the alternate cpu capability.
 209                  */
 210                 len += sprintf(page + len, "Capability:           %u %u\n",
 211                                info->capability, ext->alt_capability);
 212                 for (i = 2; i <= info->cpus_total; i++)
 213                         len += sprintf(page + len,
 214                                        "Adjustment %02d-way:    %u %u\n",
 215                                        i, info->adjustment[i-2],
 216                                        ext->alt_adjustment[i-2]);
 217
 218         } else {
 219                 len += sprintf(page + len, "Capability:           %u\n",
 220                                info->capability);
 221                 for (i = 2; i <= info->cpus_total; i++)
 222                         len += sprintf(page + len,
 223                                        "Adjustment %02d-way:    %u\n",
 224                                        i, info->adjustment[i-2]);
 225         }
 226
 227         if (info->secondary_capability != 0)
 228                 len += sprintf(page + len, "Secondary Capability: %d\n",
 229                                info->secondary_capability);
 230
 231         return len;
 232 }
 233
 234 #if 0 /* Currently unused */
 235 static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
 236 {
 237         if (stsi(info, 2, 2, 1) == -ENOSYS)
 238                 return len;
 239
 240         len += sprintf(page + len, "\n");
 241         EBCASC (info->sequence, sizeof(info->sequence));
 242         EBCASC (info->plant, sizeof(info->plant));
 243         len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
 244                        info->sequence);
 245         len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
 246                        info->plant);
 247         return len;
 248 }
 249 #endif
 250
 251 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 252 {
 253         if (stsi(info, 2, 2, 2) == -ENOSYS)
 254                 return len;
 255
 256         EBCASC (info->name, sizeof(info->name));
 257
 258         len += sprintf(page + len, "\n");
 259         len += sprintf(page + len, "LPAR Number:          %d\n",
 260                        info->lpar_number);
 261
 262         len += sprintf(page + len, "LPAR Characteristics: ");
 263         if (info->characteristics & LPAR_CHAR_DEDICATED)
 264                 len += sprintf(page + len, "Dedicated ");
 265         if (info->characteristics & LPAR_CHAR_SHARED)
 266                 len += sprintf(page + len, "Shared ");
 267         if (info->characteristics & LPAR_CHAR_LIMITED)
 268                 len += sprintf(page + len, "Limited ");
 269         len += sprintf(page + len, "\n");
 270
 271         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 272                        info->name);
 273
 274         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 275                        info->caf);
 276
 277         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 278                        info->cpus_total);
 279         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 280                        info->cpus_configured);
 281         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 282                        info->cpus_standby);
 283         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 284                        info->cpus_reserved);
 285         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 286                        info->cpus_dedicated);
 287         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 288                        info->cpus_shared);
 289         return len;
 290 }
 291
 292 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 293 {
 294         int i;
 295
 296         if (stsi(info, 3, 2, 2) == -ENOSYS)
 297                 return len;
 298         for (i = 0; i < info->count; i++) {
 299                 EBCASC (info->vm[i].name, sizeof(info->vm[i].name));
 300                 EBCASC (info->vm[i].cpi, sizeof(info->vm[i].cpi));
 301                 len += sprintf(page + len, "\n");
 302                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 303                                i, info->vm[i].name);
 304                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 305                                i, info->vm[i].cpi);
 306
 307                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 308                                i, info->vm[i].caf);
 309
 310                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 311                                i, info->vm[i].cpus_total);
 312                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 313                                i, info->vm[i].cpus_configured);
 314                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 315                                i, info->vm[i].cpus_standby);
 316                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 317                                i, info->vm[i].cpus_reserved);
 318         }
 319         return len;
 320 }
 321
 322
 323 static int proc_read_sysinfo(char *page, char **start,
 324                              off_t off, int count,
 325                              int *eof, void *data)
 326 {
 327         unsigned long info = get_zeroed_page (GFP_KERNEL);
 328         int level, len;
 329
 330         if (!info)
 331                 return 0;
 332
 333         len = 0;
 334         level = stsi_0();
 335         if (level >= 1)
 336                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 337
 338         if (level >= 1)
 339                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 340
 341         if (level >= 2)
 342                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 343
 344         if (level >= 3)
 345                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 346
 347         free_page (info);
 348         return len;
 349 }
 350
 351 static __init int create_proc_sysinfo(void)
 352 {
 353         create_proc_read_entry("sysinfo", 0444, NULL,
 354                                proc_read_sysinfo, NULL);
 355         return 0;
 356 }
 357
 358 __initcall(create_proc_sysinfo);
 359
 360 int get_cpu_capability(unsigned int *capability)
 361 {
 362         struct sysinfo_1_2_2 *info;
 363         int rc;
 364
 365         info = (void *) get_zeroed_page(GFP_KERNEL);
 366         if (!info)
 367                 return -ENOMEM;
 368         rc = stsi(info, 1, 2, 2);
 369         if (rc == -ENOSYS)
 370                 goto out;
 371         rc = 0;
 372         *capability = info->capability;
 373 out:
 374         free_page((unsigned long) info);
 375         return rc;
 376 }
 377
 378 /*
 379  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 380  */
 381 void s390_adjust_jiffies(void)
 382 {
 383         struct sysinfo_1_2_2 *info;
 384         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 385         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 386         FP_DECL_EX;
 387         unsigned int capability;
 388
 389         info = (void *) get_zeroed_page(GFP_KERNEL);
 390         if (!info)
 391                 return;
 392
 393         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 394                 /*
 395                  * Major sigh. The cpu capability encoding is "special".
 396                  * If the first 9 bits of info->capability are 0 then it
 397                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 398                  * If the first 9 bits are != 0 then it is a 32 bit float.
 399                  * In addition a lower value indicates a proportionally
 400                  * higher cpu capacity. Bogomips are the other way round.
 401                  * To get to a halfway suitable number we divide 1e7
 402                  * by the cpu capability number. Yes, that means a floating
 403                  * point division .. math-emu here we come :-)
 404                  */
 405                 FP_UNPACK_SP(SA, &fmil);
 406                 if ((info->capability >> 23) == 0)
 407                         FP_FROM_INT_S(SB, info->capability, 32, int);
 408                 else
 409                         FP_UNPACK_SP(SB, &info->capability);
 410                 FP_DIV_S(SR, SA, SB);
 411                 FP_TO_INT_S(capability, SR, 32, 0);
 412         } else
 413                 /*
 414                  * Really old machine without stsi block for basic
 415                  * cpu information. Report 42.0 bogomips.
 416                  */
 417                 capability = 42;
 418         loops_per_jiffy = capability * (500000/HZ);
 419         free_page((unsigned long) info);
 420 }
 421
 422 /*
 423  * calibrate the delay loop
 424  */
 425 void __cpuinit calibrate_delay(void)
 426 {
 427         s390_adjust_jiffies();
 428         /* Print the good old Bogomips line .. */
 429         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 430                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 431                (loops_per_jiffy/(5000/HZ)) % 100);
 432 }