linux/arch/s390/kernel/sysinfo.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  Copyright IBM Corp. 2001, 2009
   4 *  Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
   5 *             Martin Schwidefsky <schwidefsky@de.ibm.com>,
   6 */
   7
   8#include <linux/debugfs.h>
   9#include <linux/kernel.h>
  10#include <linux/mm.h>
  11#include <linux/proc_fs.h>
  12#include <linux/seq_file.h>
  13#include <linux/init.h>
  14#include <linux/delay.h>
  15#include <linux/export.h>
  16#include <linux/slab.h>
  17#include <asm/ebcdic.h>
  18#include <asm/debug.h>
  19#include <asm/sysinfo.h>
  20#include <asm/cpcmd.h>
  21#include <asm/topology.h>
  22#include <asm/fpu/api.h>
  23
  24int topology_max_mnest;
  25
  26static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
  27{
  28        register int r0 asm("0") = (fc << 28) | sel1;
  29        register int r1 asm("1") = sel2;
  30        int rc = 0;
  31
  32        asm volatile(
  33                "       stsi    0(%3)\n"
  34                "0:     jz      2f\n"
  35                "1:     lhi     %1,%4\n"
  36                "2:\n"
  37                EX_TABLE(0b, 1b)
  38                : "+d" (r0), "+d" (rc)
  39                : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
  40                : "cc", "memory");
  41        *lvl = ((unsigned int) r0) >> 28;
  42        return rc;
  43}
  44
  45/*
  46 * stsi - store system information
  47 *
  48 * Returns the current configuration level if function code 0 was specified.
  49 * Otherwise returns 0 on success or a negative value on error.
  50 */
  51int stsi(void *sysinfo, int fc, int sel1, int sel2)
  52{
  53        int lvl, rc;
  54
  55        rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
  56        if (rc)
  57                return rc;
  58        return fc ? 0 : lvl;
  59}
  60EXPORT_SYMBOL(stsi);
  61
  62static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
  63{
  64        switch (encoding) {
  65        case 1: /* EBCDIC */
  66                EBCASC(name, len);
  67                break;
  68        case 2: /* UTF-8 */
  69                break;
  70        default:
  71                return false;
  72        }
  73        return true;
  74}
  75
  76static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  77{
  78        int i;
  79
  80        if (stsi(info, 1, 1, 1))
  81                return;
  82        EBCASC(info->manufacturer, sizeof(info->manufacturer));
  83        EBCASC(info->type, sizeof(info->type));
  84        EBCASC(info->model, sizeof(info->model));
  85        EBCASC(info->sequence, sizeof(info->sequence));
  86        EBCASC(info->plant, sizeof(info->plant));
  87        EBCASC(info->model_capacity, sizeof(info->model_capacity));
  88        EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  89        EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  90        seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  91        seq_printf(m, "Type:                 %-4.4s\n", info->type);
  92        if (info->lic)
  93                seq_printf(m, "LIC Identifier:       %016lx\n", info->lic);
  94        /*
  95         * Sigh: the model field has been renamed with System z9
  96         * to model_capacity and a new model field has been added
  97         * after the plant field. To avoid confusing older programs
  98         * the "Model:" prints "model_capacity model" or just
  99         * "model_capacity" if the model string is empty .
 100         */
 101        seq_printf(m, "Model:                %-16.16s", info->model_capacity);
 102        if (info->model[0] != '\0')
 103                seq_printf(m, " %-16.16s", info->model);
 104        seq_putc(m, '\n');
 105        seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
 106        seq_printf(m, "Plant:                %-4.4s\n", info->plant);
 107        seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
 108                   info->model_capacity, info->model_cap_rating);
 109        if (info->model_perm_cap_rating)
 110                seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
 111                           info->model_perm_cap,
 112                           info->model_perm_cap_rating);
 113        if (info->model_temp_cap_rating)
 114                seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
 115                           info->model_temp_cap,
 116                           info->model_temp_cap_rating);
 117        if (info->ncr)
 118                seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
 119        if (info->npr)
 120                seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
 121        if (info->ntr)
 122                seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
 123        if (info->cai) {
 124                seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 125                seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 126                seq_printf(m, "Capacity Transient:   %d\n", info->t);
 127        }
 128        if (info->p) {
 129                for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 130                        seq_printf(m, "Type %d Percentage:    %d\n",
 131                                   i, info->typepct[i - 1]);
 132                }
 133        }
 134}
 135
 136static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 137{
 138        int i;
 139
 140        seq_putc(m, '\n');
 141        if (!MACHINE_HAS_TOPOLOGY)
 142                return;
 143        if (stsi(info, 15, 1, topology_max_mnest))
 144                return;
 145        seq_printf(m, "CPU Topology HW:     ");
 146        for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 147                seq_printf(m, " %d", info->mag[i]);
 148        seq_putc(m, '\n');
 149#ifdef CONFIG_SCHED_TOPOLOGY
 150        store_topology(info);
 151        seq_printf(m, "CPU Topology SW:     ");
 152        for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 153                seq_printf(m, " %d", info->mag[i]);
 154        seq_putc(m, '\n');
 155#endif
 156}
 157
 158static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 159{
 160        struct sysinfo_1_2_2_extension *ext;
 161        int i;
 162
 163        if (stsi(info, 1, 2, 2))
 164                return;
 165        ext = (struct sysinfo_1_2_2_extension *)
 166                ((unsigned long) info + info->acc_offset);
 167        seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 168        seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 169        seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 170        seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 171        if (info->mt_installed) {
 172                seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
 173                seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
 174        }
 175        /*
 176         * Sigh 2. According to the specification the alternate
 177         * capability field is a 32 bit floating point number
 178         * if the higher order 8 bits are not zero. Printing
 179         * a floating point number in the kernel is a no-no,
 180         * always print the number as 32 bit unsigned integer.
 181         * The user-space needs to know about the strange
 182         * encoding of the alternate cpu capability.
 183         */
 184        seq_printf(m, "Capability:           %u", info->capability);
 185        if (info->format == 1)
 186                seq_printf(m, " %u", ext->alt_capability);
 187        seq_putc(m, '\n');
 188        if (info->nominal_cap)
 189                seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 190        if (info->secondary_cap)
 191                seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 192        for (i = 2; i <= info->cpus_total; i++) {
 193                seq_printf(m, "Adjustment %02d-way:    %u",
 194                           i, info->adjustment[i-2]);
 195                if (info->format == 1)
 196                        seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 197                seq_putc(m, '\n');
 198        }
 199}
 200
 201static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 202{
 203        if (stsi(info, 2, 2, 2))
 204                return;
 205        EBCASC(info->name, sizeof(info->name));
 206        seq_putc(m, '\n');
 207        seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 208        seq_printf(m, "LPAR Characteristics: ");
 209        if (info->characteristics & LPAR_CHAR_DEDICATED)
 210                seq_printf(m, "Dedicated ");
 211        if (info->characteristics & LPAR_CHAR_SHARED)
 212                seq_printf(m, "Shared ");
 213        if (info->characteristics & LPAR_CHAR_LIMITED)
 214                seq_printf(m, "Limited ");
 215        seq_putc(m, '\n');
 216        seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 217        seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 218        seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 219        seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 220        seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 221        seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 222        seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 223        seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 224        if (info->mt_installed) {
 225                seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
 226                seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 227                seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 228        }
 229        if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
 230                seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
 231                seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
 232        }
 233}
 234
 235static void print_ext_name(struct seq_file *m, int lvl,
 236                           struct sysinfo_3_2_2 *info)
 237{
 238        size_t len = sizeof(info->ext_names[lvl]);
 239
 240        if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 241                return;
 242        seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 243                   info->ext_names[lvl]);
 244}
 245
 246static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
 247{
 248        if (uuid_is_null(&info->vm[i].uuid))
 249                return;
 250        seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
 251}
 252
 253static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 254{
 255        int i;
 256
 257        if (stsi(info, 3, 2, 2))
 258                return;
 259        for (i = 0; i < info->count; i++) {
 260                EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 261                EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 262                seq_putc(m, '\n');
 263                seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 264                seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 265                seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 266                seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 267                seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 268                seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 269                seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 270                print_ext_name(m, i, info);
 271                print_uuid(m, i, info);
 272        }
 273}
 274
 275static int sysinfo_show(struct seq_file *m, void *v)
 276{
 277        void *info = (void *)get_zeroed_page(GFP_KERNEL);
 278        int level;
 279
 280        if (!info)
 281                return 0;
 282        level = stsi(NULL, 0, 0, 0);
 283        if (level >= 1)
 284                stsi_1_1_1(m, info);
 285        if (level >= 1)
 286                stsi_15_1_x(m, info);
 287        if (level >= 1)
 288                stsi_1_2_2(m, info);
 289        if (level >= 2)
 290                stsi_2_2_2(m, info);
 291        if (level >= 3)
 292                stsi_3_2_2(m, info);
 293        free_page((unsigned long)info);
 294        return 0;
 295}
 296
 297static int __init sysinfo_create_proc(void)
 298{
 299        proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
 300        return 0;
 301}
 302device_initcall(sysinfo_create_proc);
 303
 304/*
 305 * Service levels interface.
 306 */
 307
 308static DECLARE_RWSEM(service_level_sem);
 309static LIST_HEAD(service_level_list);
 310
 311int register_service_level(struct service_level *slr)
 312{
 313        struct service_level *ptr;
 314
 315        down_write(&service_level_sem);
 316        list_for_each_entry(ptr, &service_level_list, list)
 317                if (ptr == slr) {
 318                        up_write(&service_level_sem);
 319                        return -EEXIST;
 320                }
 321        list_add_tail(&slr->list, &service_level_list);
 322        up_write(&service_level_sem);
 323        return 0;
 324}
 325EXPORT_SYMBOL(register_service_level);
 326
 327int unregister_service_level(struct service_level *slr)
 328{
 329        struct service_level *ptr, *next;
 330        int rc = -ENOENT;
 331
 332        down_write(&service_level_sem);
 333        list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 334                if (ptr != slr)
 335                        continue;
 336                list_del(&ptr->list);
 337                rc = 0;
 338                break;
 339        }
 340        up_write(&service_level_sem);
 341        return rc;
 342}
 343EXPORT_SYMBOL(unregister_service_level);
 344
 345static void *service_level_start(struct seq_file *m, loff_t *pos)
 346{
 347        down_read(&service_level_sem);
 348        return seq_list_start(&service_level_list, *pos);
 349}
 350
 351static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 352{
 353        return seq_list_next(p, &service_level_list, pos);
 354}
 355
 356static void service_level_stop(struct seq_file *m, void *p)
 357{
 358        up_read(&service_level_sem);
 359}
 360
 361static int service_level_show(struct seq_file *m, void *p)
 362{
 363        struct service_level *slr;
 364
 365        slr = list_entry(p, struct service_level, list);
 366        slr->seq_print(m, slr);
 367        return 0;
 368}
 369
 370static const struct seq_operations service_level_seq_ops = {
 371        .start          = service_level_start,
 372        .next           = service_level_next,
 373        .stop           = service_level_stop,
 374        .show           = service_level_show
 375};
 376
 377static void service_level_vm_print(struct seq_file *m,
 378                                   struct service_level *slr)
 379{
 380        char *query_buffer, *str;
 381
 382        query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 383        if (!query_buffer)
 384                return;
 385        cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 386        str = strchr(query_buffer, '\n');
 387        if (str)
 388                *str = 0;
 389        seq_printf(m, "VM: %s\n", query_buffer);
 390        kfree(query_buffer);
 391}
 392
 393static struct service_level service_level_vm = {
 394        .seq_print = service_level_vm_print
 395};
 396
 397static __init int create_proc_service_level(void)
 398{
 399        proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
 400        if (MACHINE_IS_VM)
 401                register_service_level(&service_level_vm);
 402        return 0;
 403}
 404subsys_initcall(create_proc_service_level);
 405
 406/*
 407 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 408 */
 409void s390_adjust_jiffies(void)
 410{
 411        struct sysinfo_1_2_2 *info;
 412        unsigned long capability;
 413        struct kernel_fpu fpu;
 414
 415        info = (void *) get_zeroed_page(GFP_KERNEL);
 416        if (!info)
 417                return;
 418
 419        if (stsi(info, 1, 2, 2) == 0) {
 420                /*
 421                 * Major sigh. The cpu capability encoding is "special".
 422                 * If the first 9 bits of info->capability are 0 then it
 423                 * is a 32 bit unsigned integer in the range 0 .. 2^23.
 424                 * If the first 9 bits are != 0 then it is a 32 bit float.
 425                 * In addition a lower value indicates a proportionally
 426                 * higher cpu capacity. Bogomips are the other way round.
 427                 * To get to a halfway suitable number we divide 1e7
 428                 * by the cpu capability number. Yes, that means a floating
 429                 * point division ..
 430                 */
 431                kernel_fpu_begin(&fpu, KERNEL_FPR);
 432                asm volatile(
 433                        "       sfpc    %3\n"
 434                        "       l       %0,%1\n"
 435                        "       tmlh    %0,0xff80\n"
 436                        "       jnz     0f\n"
 437                        "       cefbr   %%f2,%0\n"
 438                        "       j       1f\n"
 439                        "0:     le      %%f2,%1\n"
 440                        "1:     cefbr   %%f0,%2\n"
 441                        "       debr    %%f0,%%f2\n"
 442                        "       cgebr   %0,5,%%f0\n"
 443                        : "=&d" (capability)
 444                        : "Q" (info->capability), "d" (10000000), "d" (0)
 445                        : "cc"
 446                        );
 447                kernel_fpu_end(&fpu, KERNEL_FPR);
 448        } else
 449                /*
 450                 * Really old machine without stsi block for basic
 451                 * cpu information. Report 42.0 bogomips.
 452                 */
 453                capability = 42;
 454        loops_per_jiffy = capability * (500000/HZ);
 455        free_page((unsigned long) info);
 456}
 457
 458/*
 459 * calibrate the delay loop
 460 */
 461void calibrate_delay(void)
 462{
 463        s390_adjust_jiffies();
 464        /* Print the good old Bogomips line .. */
 465        printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 466               "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 467               (loops_per_jiffy/(5000/HZ)) % 100);
 468}
 469
 470#ifdef CONFIG_DEBUG_FS
 471
 472#define STSI_FILE(fc, s1, s2)                                                  \
 473static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
 474{                                                                              \
 475        file->private_data = (void *) get_zeroed_page(GFP_KERNEL);             \
 476        if (!file->private_data)                                               \
 477                return -ENOMEM;                                                \
 478        if (stsi(file->private_data, fc, s1, s2)) {                            \
 479                free_page((unsigned long)file->private_data);                  \
 480                file->private_data = NULL;                                     \
 481                return -EACCES;                                                \
 482        }                                                                      \
 483        return nonseekable_open(inode, file);                                  \
 484}                                                                              \
 485                                                                               \
 486static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
 487        .open           = stsi_open_##fc##_##s1##_##s2,                        \
 488        .release        = stsi_release,                                        \
 489        .read           = stsi_read,                                           \
 490        .llseek         = no_llseek,                                           \
 491};
 492
 493static int stsi_release(struct inode *inode, struct file *file)
 494{
 495        free_page((unsigned long)file->private_data);
 496        return 0;
 497}
 498
 499static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 500{
 501        return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
 502}
 503
 504STSI_FILE( 1, 1, 1);
 505STSI_FILE( 1, 2, 1);
 506STSI_FILE( 1, 2, 2);
 507STSI_FILE( 2, 2, 1);
 508STSI_FILE( 2, 2, 2);
 509STSI_FILE( 3, 2, 2);
 510STSI_FILE(15, 1, 2);
 511STSI_FILE(15, 1, 3);
 512STSI_FILE(15, 1, 4);
 513STSI_FILE(15, 1, 5);
 514STSI_FILE(15, 1, 6);
 515
 516struct stsi_file {
 517        const struct file_operations *fops;
 518        char *name;
 519};
 520
 521static struct stsi_file stsi_file[] __initdata = {
 522        {.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
 523        {.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
 524        {.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
 525        {.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
 526        {.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
 527        {.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
 528        {.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
 529        {.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
 530        {.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
 531        {.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
 532        {.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
 533};
 534
 535static u8 stsi_0_0_0;
 536
 537static __init int stsi_init_debugfs(void)
 538{
 539        struct dentry *stsi_root;
 540        struct stsi_file *sf;
 541        int lvl, i;
 542
 543        stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
 544        if (IS_ERR_OR_NULL(stsi_root))
 545                return 0;
 546        lvl = stsi(NULL, 0, 0, 0);
 547        if (lvl > 0)
 548                stsi_0_0_0 = lvl;
 549        debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
 550        for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
 551                sf = &stsi_file[i];
 552                debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
 553        }
 554        if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
 555                char link_to[10];
 556
 557                sprintf(link_to, "15_1_%d", topology_mnest_limit());
 558                debugfs_create_symlink("topology", stsi_root, link_to);
 559        }
 560        return 0;
 561}
 562device_initcall(stsi_init_debugfs);
 563
 564#endif /* CONFIG_DEBUG_FS */
 565