LXR linux/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
  20/* Sigh, math-emu. Don't ask. */
  21#include <asm/sfp-util.h>
  22#include <math-emu/soft-fp.h>
  23#include <math-emu/single.h>
  24
  25static inline int stsi_0(void)
  26{
  27        int rc = stsi(NULL, 0, 0, 0);
  28        return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
  29}
  30
  31static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
  32{
  33        if (stsi(info, 1, 1, 1) == -ENOSYS)
  34                return len;
  35
  36        EBCASC(info->manufacturer, sizeof(info->manufacturer));
  37        EBCASC(info->type, sizeof(info->type));
  38        EBCASC(info->model, sizeof(info->model));
  39        EBCASC(info->sequence, sizeof(info->sequence));
  40        EBCASC(info->plant, sizeof(info->plant));
  41        EBCASC(info->model_capacity, sizeof(info->model_capacity));
  42        EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  43        EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  44        len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
  45                       info->manufacturer);
  46        len += sprintf(page + len, "Type:                 %-4.4s\n",
  47                       info->type);
  48        if (info->model[0] != '\0')
  49                /*
  50                 * Sigh: the model field has been renamed with System z9
  51                 * to model_capacity and a new model field has been added
  52                 * after the plant field. To avoid confusing older programs
  53                 * the "Model:" prints "model_capacity model" or just
  54                 * "model_capacity" if the model string is empty .
  55                 */
  56                len += sprintf(page + len,
  57                               "Model:                %-16.16s %-16.16s\n",
  58                               info->model_capacity, info->model);
  59        else
  60                len += sprintf(page + len, "Model:                %-16.16s\n",
  61                               info->model_capacity);
  62        len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
  63                       info->sequence);
  64        len += sprintf(page + len, "Plant:                %-4.4s\n",
  65                       info->plant);
  66        len += sprintf(page + len, "Model Capacity:       %-16.16s %08u\n",
  67                       info->model_capacity, *(u32 *) info->model_cap_rating);
  68        if (info->model_perm_cap[0] != '\0')
  69                len += sprintf(page + len,
  70                               "Model Perm. Capacity: %-16.16s %08u\n",
  71                               info->model_perm_cap,
  72                               *(u32 *) info->model_perm_cap_rating);
  73        if (info->model_temp_cap[0] != '\0')
  74                len += sprintf(page + len,
  75                               "Model Temp. Capacity: %-16.16s %08u\n",
  76                               info->model_temp_cap,
  77                               *(u32 *) info->model_temp_cap_rating);
  78        if (info->cai) {
  79                len += sprintf(page + len,
  80                               "Capacity Adj. Ind.:   %d\n",
  81                               info->cai);
  82                len += sprintf(page + len, "Capacity Ch. Reason:  %d\n",
  83                               info->ccr);
  84        }
  85        return len;
  86}
  87
  88static int stsi_15_1_x(struct sysinfo_15_1_x *info, char *page, int len)
  89{
  90        static int max_mnest;
  91        int i, rc;
  92
  93        len += sprintf(page + len, "\n");
  94        if (!MACHINE_HAS_TOPOLOGY)
  95                return len;
  96        if (max_mnest) {
  97                stsi(info, 15, 1, max_mnest);
  98        } else {
  99                for (max_mnest = 6; max_mnest > 1; max_mnest--) {
 100                        rc = stsi(info, 15, 1, max_mnest);
 101                        if (rc != -ENOSYS)
 102                                break;
 103                }
 104        }
 105        len += sprintf(page + len, "CPU Topology HW:     ");
 106        for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 107                len += sprintf(page + len, " %d", info->mag[i]);
 108        len += sprintf(page + len, "\n");
 109#ifdef CONFIG_SCHED_MC
 110        store_topology(info);
 111        len += sprintf(page + len, "CPU Topology SW:     ");
 112        for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 113                len += sprintf(page + len, " %d", info->mag[i]);
 114        len += sprintf(page + len, "\n");
 115#endif
 116        return len;
 117}
 118
 119static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
 120{
 121        struct sysinfo_1_2_2_extension *ext;
 122        int i;
 123
 124        if (stsi(info, 1, 2, 2) == -ENOSYS)
 125                return len;
 126        ext = (struct sysinfo_1_2_2_extension *)
 127                ((unsigned long) info + info->acc_offset);
 128
 129        len += sprintf(page + len, "CPUs Total:           %d\n",
 130                       info->cpus_total);
 131        len += sprintf(page + len, "CPUs Configured:      %d\n",
 132                       info->cpus_configured);
 133        len += sprintf(page + len, "CPUs Standby:         %d\n",
 134                       info->cpus_standby);
 135        len += sprintf(page + len, "CPUs Reserved:        %d\n",
 136                       info->cpus_reserved);
 137
 138        if (info->format == 1) {
 139                /*
 140                 * Sigh 2. According to the specification the alternate
 141                 * capability field is a 32 bit floating point number
 142                 * if the higher order 8 bits are not zero. Printing
 143                 * a floating point number in the kernel is a no-no,
 144                 * always print the number as 32 bit unsigned integer.
 145                 * The user-space needs to know about the strange
 146                 * encoding of the alternate cpu capability.
 147                 */
 148                len += sprintf(page + len, "Capability:           %u %u\n",
 149                               info->capability, ext->alt_capability);
 150                for (i = 2; i <= info->cpus_total; i++)
 151                        len += sprintf(page + len,
 152                                       "Adjustment %02d-way:    %u %u\n",
 153                                       i, info->adjustment[i-2],
 154                                       ext->alt_adjustment[i-2]);
 155
 156        } else {
 157                len += sprintf(page + len, "Capability:           %u\n",
 158                               info->capability);
 159                for (i = 2; i <= info->cpus_total; i++)
 160                        len += sprintf(page + len,
 161                                       "Adjustment %02d-way:    %u\n",
 162                                       i, info->adjustment[i-2]);
 163        }
 164
 165        if (info->secondary_capability != 0)
 166                len += sprintf(page + len, "Secondary Capability: %d\n",
 167                               info->secondary_capability);
 168        return len;
 169}
 170
 171static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 172{
 173        if (stsi(info, 2, 2, 2) == -ENOSYS)
 174                return len;
 175
 176        EBCASC(info->name, sizeof(info->name));
 177
 178        len += sprintf(page + len, "\n");
 179        len += sprintf(page + len, "LPAR Number:          %d\n",
 180                       info->lpar_number);
 181
 182        len += sprintf(page + len, "LPAR Characteristics: ");
 183        if (info->characteristics & LPAR_CHAR_DEDICATED)
 184                len += sprintf(page + len, "Dedicated ");
 185        if (info->characteristics & LPAR_CHAR_SHARED)
 186                len += sprintf(page + len, "Shared ");
 187        if (info->characteristics & LPAR_CHAR_LIMITED)
 188                len += sprintf(page + len, "Limited ");
 189        len += sprintf(page + len, "\n");
 190
 191        len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 192                       info->name);
 193
 194        len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 195                       info->caf);
 196
 197        len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 198                       info->cpus_total);
 199        len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 200                       info->cpus_configured);
 201        len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 202                       info->cpus_standby);
 203        len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 204                       info->cpus_reserved);
 205        len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 206                       info->cpus_dedicated);
 207        len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 208                       info->cpus_shared);
 209        return len;
 210}
 211
 212static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 213{
 214        int i;
 215
 216        if (stsi(info, 3, 2, 2) == -ENOSYS)
 217                return len;
 218        for (i = 0; i < info->count; i++) {
 219                EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 220                EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 221                len += sprintf(page + len, "\n");
 222                len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 223                               i, info->vm[i].name);
 224                len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 225                               i, info->vm[i].cpi);
 226
 227                len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 228                               i, info->vm[i].caf);
 229
 230                len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 231                               i, info->vm[i].cpus_total);
 232                len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 233                               i, info->vm[i].cpus_configured);
 234                len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 235                               i, info->vm[i].cpus_standby);
 236                len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 237                               i, info->vm[i].cpus_reserved);
 238        }
 239        return len;
 240}
 241
 242static int proc_read_sysinfo(char *page, char **start,
 243                             off_t off, int count,
 244                             int *eof, void *data)
 245{
 246        unsigned long info = get_zeroed_page(GFP_KERNEL);
 247        int level, len;
 248
 249        if (!info)
 250                return 0;
 251
 252        len = 0;
 253        level = stsi_0();
 254        if (level >= 1)
 255                len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 256
 257        if (level >= 1)
 258                len = stsi_15_1_x((struct sysinfo_15_1_x *) info, page, len);
 259
 260        if (level >= 1)
 261                len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 262
 263        if (level >= 2)
 264                len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 265
 266        if (level >= 3)
 267                len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 268
 269        free_page(info);
 270        return len;
 271}
 272
 273static __init int create_proc_sysinfo(void)
 274{
 275        create_proc_read_entry("sysinfo", 0444, NULL,
 276                               proc_read_sysinfo, NULL);
 277        return 0;
 278}
 279device_initcall(create_proc_sysinfo);
 280
 281/*
 282 * Service levels interface.
 283 */
 284
 285static DECLARE_RWSEM(service_level_sem);
 286static LIST_HEAD(service_level_list);
 287
 288int register_service_level(struct service_level *slr)
 289{
 290        struct service_level *ptr;
 291
 292        down_write(&service_level_sem);
 293        list_for_each_entry(ptr, &service_level_list, list)
 294                if (ptr == slr) {
 295                        up_write(&service_level_sem);
 296                        return -EEXIST;
 297                }
 298        list_add_tail(&slr->list, &service_level_list);
 299        up_write(&service_level_sem);
 300        return 0;
 301}
 302EXPORT_SYMBOL(register_service_level);
 303
 304int unregister_service_level(struct service_level *slr)
 305{
 306        struct service_level *ptr, *next;
 307        int rc = -ENOENT;
 308
 309        down_write(&service_level_sem);
 310        list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 311                if (ptr != slr)
 312                        continue;
 313                list_del(&ptr->list);
 314                rc = 0;
 315                break;
 316        }
 317        up_write(&service_level_sem);
 318        return rc;
 319}
 320EXPORT_SYMBOL(unregister_service_level);
 321
 322static void *service_level_start(struct seq_file *m, loff_t *pos)
 323{
 324        down_read(&service_level_sem);
 325        return seq_list_start(&service_level_list, *pos);
 326}
 327
 328static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 329{
 330        return seq_list_next(p, &service_level_list, pos);
 331}
 332
 333static void service_level_stop(struct seq_file *m, void *p)
 334{
 335        up_read(&service_level_sem);
 336}
 337
 338static int service_level_show(struct seq_file *m, void *p)
 339{
 340        struct service_level *slr;
 341
 342        slr = list_entry(p, struct service_level, list);
 343        slr->seq_print(m, slr);
 344        return 0;
 345}
 346
 347static const struct seq_operations service_level_seq_ops = {
 348        .start          = service_level_start,
 349        .next           = service_level_next,
 350        .stop           = service_level_stop,
 351        .show           = service_level_show
 352};
 353
 354static int service_level_open(struct inode *inode, struct file *file)
 355{
 356        return seq_open(file, &service_level_seq_ops);
 357}
 358
 359static const struct file_operations service_level_ops = {
 360        .open           = service_level_open,
 361        .read           = seq_read,
 362        .llseek         = seq_lseek,
 363        .release        = seq_release
 364};
 365
 366static void service_level_vm_print(struct seq_file *m,
 367                                   struct service_level *slr)
 368{
 369        char *query_buffer, *str;
 370
 371        query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 372        if (!query_buffer)
 373                return;
 374        cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 375        str = strchr(query_buffer, '\n');
 376        if (str)
 377                *str = 0;
 378        seq_printf(m, "VM: %s\n", query_buffer);
 379        kfree(query_buffer);
 380}
 381
 382static struct service_level service_level_vm = {
 383        .seq_print = service_level_vm_print
 384};
 385
 386static __init int create_proc_service_level(void)
 387{
 388        proc_create("service_levels", 0, NULL, &service_level_ops);
 389        if (MACHINE_IS_VM)
 390                register_service_level(&service_level_vm);
 391        return 0;
 392}
 393subsys_initcall(create_proc_service_level);
 394
 395/*
 396 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 397 */
 398void s390_adjust_jiffies(void)
 399{
 400        struct sysinfo_1_2_2 *info;
 401        const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 402        FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 403        FP_DECL_EX;
 404        unsigned int capability;
 405
 406        info = (void *) get_zeroed_page(GFP_KERNEL);
 407        if (!info)
 408                return;
 409
 410        if (stsi(info, 1, 2, 2) != -ENOSYS) {
 411                /*
 412                 * Major sigh. The cpu capability encoding is "special".
 413                 * If the first 9 bits of info->capability are 0 then it
 414                 * is a 32 bit unsigned integer in the range 0 .. 2^23.
 415                 * If the first 9 bits are != 0 then it is a 32 bit float.
 416                 * In addition a lower value indicates a proportionally
 417                 * higher cpu capacity. Bogomips are the other way round.
 418                 * To get to a halfway suitable number we divide 1e7
 419                 * by the cpu capability number. Yes, that means a floating
 420                 * point division .. math-emu here we come :-)
 421                 */
 422                FP_UNPACK_SP(SA, &fmil);
 423                if ((info->capability >> 23) == 0)
 424                        FP_FROM_INT_S(SB, (long) info->capability, 64, long);
 425                else
 426                        FP_UNPACK_SP(SB, &info->capability);
 427                FP_DIV_S(SR, SA, SB);
 428                FP_TO_INT_S(capability, SR, 32, 0);
 429        } else
 430                /*
 431                 * Really old machine without stsi block for basic
 432                 * cpu information. Report 42.0 bogomips.
 433                 */
 434                capability = 42;
 435        loops_per_jiffy = capability * (500000/HZ);
 436        free_page((unsigned long) info);
 437}
 438
 439/*
 440 * calibrate the delay loop
 441 */
 442void __cpuinit calibrate_delay(void)
 443{
 444        s390_adjust_jiffies();
 445        /* Print the good old Bogomips line .. */
 446        printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 447               "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 448               (loops_per_jiffy/(5000/HZ)) % 100);
 449}
 450