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 <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
  23static 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
  29static 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
  79static 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
 132static 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
 173static 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
 203static 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
 231static __init int create_proc_sysinfo(void)
 232{
 233        create_proc_read_entry("sysinfo", 0444, NULL,
 234                               proc_read_sysinfo, NULL);
 235        return 0;
 236}
 237device_initcall(create_proc_sysinfo);
 238
 239/*
 240 * Service levels interface.
 241 */
 242
 243static DECLARE_RWSEM(service_level_sem);
 244static LIST_HEAD(service_level_list);
 245
 246int 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}
 260EXPORT_SYMBOL(register_service_level);
 261
 262int 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}
 278EXPORT_SYMBOL(unregister_service_level);
 279
 280static 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
 286static 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
 291static void service_level_stop(struct seq_file *m, void *p)
 292{
 293        up_read(&service_level_sem);
 294}
 295
 296static 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
 305static 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
 312static int service_level_open(struct inode *inode, struct file *file)
 313{
 314        return seq_open(file, &service_level_seq_ops);
 315}
 316
 317static 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
 324static 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
 340static struct service_level service_level_vm = {
 341        .seq_print = service_level_vm_print
 342};
 343
 344static __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}
 351subsys_initcall(create_proc_service_level);
 352
 353/*
 354 * Bogomips calculation based on cpu capability.
 355 */
 356int 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;
 369out:
 370        free_page((unsigned long) info);
 371        return rc;
 372}
 373
 374/*
 375 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 376 */
 377void 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 */
 421void __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}
 429