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
  25 int topology_max_mnest;
  26
  27 /*
  28  * stsi - store system information
  29  *
  30  * Returns the current configuration level if function code 0 was specified.
  31  * Otherwise returns 0 on success or a negative value on error.
  32  */
  33 int stsi(void *sysinfo, int fc, int sel1, int sel2)
  34 {
  35         register int r0 asm("0") = (fc << 28) | sel1;
  36         register int r1 asm("1") = sel2;
  37         int rc = 0;
  38
  39         asm volatile(
  40                 "       stsi    0(%3)\n"
  41                 "0:     jz      2f\n"
  42                 "1:     lhi     %1,%4\n"
  43                 "2:\n"
  44                 EX_TABLE(0b, 1b)
  45                 : "+d" (r0), "+d" (rc)
  46                 : "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)
  47                 : "cc", "memory");
  48         if (rc)
  49                 return rc;
  50         return fc ? 0 : ((unsigned int) r0) >> 28;
  51 }
  52 EXPORT_SYMBOL(stsi);
  53
  54 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
  55 {
  56         int i;
  57
  58         if (stsi(info, 1, 1, 1))
  59                 return;
  60         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  61         EBCASC(info->type, sizeof(info->type));
  62         EBCASC(info->model, sizeof(info->model));
  63         EBCASC(info->sequence, sizeof(info->sequence));
  64         EBCASC(info->plant, sizeof(info->plant));
  65         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  66         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  67         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  68         seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
  69         seq_printf(m, "Type:                 %-4.4s\n", info->type);
  70         /*
  71          * Sigh: the model field has been renamed with System z9
  72          * to model_capacity and a new model field has been added
  73          * after the plant field. To avoid confusing older programs
  74          * the "Model:" prints "model_capacity model" or just
  75          * "model_capacity" if the model string is empty .
  76          */
  77         seq_printf(m, "Model:                %-16.16s", info->model_capacity);
  78         if (info->model[0] != '\0')
  79                 seq_printf(m, " %-16.16s", info->model);
  80         seq_putc(m, '\n');
  81         seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
  82         seq_printf(m, "Plant:                %-4.4s\n", info->plant);
  83         seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
  84                    info->model_capacity, info->model_cap_rating);
  85         if (info->model_perm_cap_rating)
  86                 seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
  87                            info->model_perm_cap,
  88                            info->model_perm_cap_rating);
  89         if (info->model_temp_cap_rating)
  90                 seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
  91                            info->model_temp_cap,
  92                            info->model_temp_cap_rating);
  93         if (info->ncr)
  94                 seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
  95         if (info->npr)
  96                 seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
  97         if (info->ntr)
  98                 seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
  99         if (info->cai) {
 100                 seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
 101                 seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
 102                 seq_printf(m, "Capacity Transient:   %d\n", info->t);
 103         }
 104         if (info->p) {
 105                 for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
 106                         seq_printf(m, "Type %d Percentage:    %d\n",
 107                                    i, info->typepct[i - 1]);
 108                 }
 109         }
 110 }
 111
 112 static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
 113 {
 114         static int max_mnest;
 115         int i, rc;
 116
 117         seq_putc(m, '\n');
 118         if (!MACHINE_HAS_TOPOLOGY)
 119                 return;
 120         if (stsi(info, 15, 1, topology_max_mnest))
 121                 return;
 122         seq_printf(m, "CPU Topology HW:     ");
 123         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 124                 seq_printf(m, " %d", info->mag[i]);
 125         seq_putc(m, '\n');
 126 #ifdef CONFIG_SCHED_MC
 127         store_topology(info);
 128         seq_printf(m, "CPU Topology SW:     ");
 129         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 130                 seq_printf(m, " %d", info->mag[i]);
 131         seq_putc(m, '\n');
 132 #endif
 133 }
 134
 135 static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
 136 {
 137         struct sysinfo_1_2_2_extension *ext;
 138         int i;
 139
 140         if (stsi(info, 1, 2, 2))
 141                 return;
 142         ext = (struct sysinfo_1_2_2_extension *)
 143                 ((unsigned long) info + info->acc_offset);
 144         seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
 145         seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
 146         seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
 147         seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
 148         /*
 149          * Sigh 2. According to the specification the alternate
 150          * capability field is a 32 bit floating point number
 151          * if the higher order 8 bits are not zero. Printing
 152          * a floating point number in the kernel is a no-no,
 153          * always print the number as 32 bit unsigned integer.
 154          * The user-space needs to know about the strange
 155          * encoding of the alternate cpu capability.
 156          */
 157         seq_printf(m, "Capability:           %u", info->capability);
 158         if (info->format == 1)
 159                 seq_printf(m, " %u", ext->alt_capability);
 160         seq_putc(m, '\n');
 161         if (info->nominal_cap)
 162                 seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
 163         if (info->secondary_cap)
 164                 seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
 165         for (i = 2; i <= info->cpus_total; i++) {
 166                 seq_printf(m, "Adjustment %02d-way:    %u",
 167                            i, info->adjustment[i-2]);
 168                 if (info->format == 1)
 169                         seq_printf(m, " %u", ext->alt_adjustment[i-2]);
 170                 seq_putc(m, '\n');
 171         }
 172 }
 173
 174 static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 175 {
 176         if (stsi(info, 2, 2, 2))
 177                 return;
 178         EBCASC(info->name, sizeof(info->name));
 179         seq_putc(m, '\n');
 180         seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
 181         seq_printf(m, "LPAR Characteristics: ");
 182         if (info->characteristics & LPAR_CHAR_DEDICATED)
 183                 seq_printf(m, "Dedicated ");
 184         if (info->characteristics & LPAR_CHAR_SHARED)
 185                 seq_printf(m, "Shared ");
 186         if (info->characteristics & LPAR_CHAR_LIMITED)
 187                 seq_printf(m, "Limited ");
 188         seq_putc(m, '\n');
 189         seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
 190         seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
 191         seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
 192         seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
 193         seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
 194         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
 195         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
 196         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
 197 }
 198
 199 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
 200 {
 201         int i;
 202
 203         if (stsi(info, 3, 2, 2))
 204                 return;
 205         for (i = 0; i < info->count; i++) {
 206                 EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
 207                 EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
 208                 seq_putc(m, '\n');
 209                 seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
 210                 seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
 211                 seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
 212                 seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
 213                 seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
 214                 seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
 215                 seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
 216         }
 217 }
 218
 219 static int sysinfo_show(struct seq_file *m, void *v)
 220 {
 221         void *info = (void *)get_zeroed_page(GFP_KERNEL);
 222         int level;
 223
 224         if (!info)
 225                 return 0;
 226         level = stsi(NULL, 0, 0, 0);
 227         if (level >= 1)
 228                 stsi_1_1_1(m, info);
 229         if (level >= 1)
 230                 stsi_15_1_x(m, info);
 231         if (level >= 1)
 232                 stsi_1_2_2(m, info);
 233         if (level >= 2)
 234                 stsi_2_2_2(m, info);
 235         if (level >= 3)
 236                 stsi_3_2_2(m, info);
 237         free_page((unsigned long)info);
 238         return 0;
 239 }
 240
 241 static int sysinfo_open(struct inode *inode, struct file *file)
 242 {
 243         return single_open(file, sysinfo_show, NULL);
 244 }
 245
 246 static const struct file_operations sysinfo_fops = {
 247         .open           = sysinfo_open,
 248         .read           = seq_read,
 249         .llseek         = seq_lseek,
 250         .release        = single_release,
 251 };
 252
 253 static int __init sysinfo_create_proc(void)
 254 {
 255         proc_create("sysinfo", 0444, NULL, &sysinfo_fops);
 256         return 0;
 257 }
 258 device_initcall(sysinfo_create_proc);
 259
 260 /*
 261  * Service levels interface.
 262  */
 263
 264 static DECLARE_RWSEM(service_level_sem);
 265 static LIST_HEAD(service_level_list);
 266
 267 int register_service_level(struct service_level *slr)
 268 {
 269         struct service_level *ptr;
 270
 271         down_write(&service_level_sem);
 272         list_for_each_entry(ptr, &service_level_list, list)
 273                 if (ptr == slr) {
 274                         up_write(&service_level_sem);
 275                         return -EEXIST;
 276                 }
 277         list_add_tail(&slr->list, &service_level_list);
 278         up_write(&service_level_sem);
 279         return 0;
 280 }
 281 EXPORT_SYMBOL(register_service_level);
 282
 283 int unregister_service_level(struct service_level *slr)
 284 {
 285         struct service_level *ptr, *next;
 286         int rc = -ENOENT;
 287
 288         down_write(&service_level_sem);
 289         list_for_each_entry_safe(ptr, next, &service_level_list, list) {
 290                 if (ptr != slr)
 291                         continue;
 292                 list_del(&ptr->list);
 293                 rc = 0;
 294                 break;
 295         }
 296         up_write(&service_level_sem);
 297         return rc;
 298 }
 299 EXPORT_SYMBOL(unregister_service_level);
 300
 301 static void *service_level_start(struct seq_file *m, loff_t *pos)
 302 {
 303         down_read(&service_level_sem);
 304         return seq_list_start(&service_level_list, *pos);
 305 }
 306
 307 static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
 308 {
 309         return seq_list_next(p, &service_level_list, pos);
 310 }
 311
 312 static void service_level_stop(struct seq_file *m, void *p)
 313 {
 314         up_read(&service_level_sem);
 315 }
 316
 317 static int service_level_show(struct seq_file *m, void *p)
 318 {
 319         struct service_level *slr;
 320
 321         slr = list_entry(p, struct service_level, list);
 322         slr->seq_print(m, slr);
 323         return 0;
 324 }
 325
 326 static const struct seq_operations service_level_seq_ops = {
 327         .start          = service_level_start,
 328         .next           = service_level_next,
 329         .stop           = service_level_stop,
 330         .show           = service_level_show
 331 };
 332
 333 static int service_level_open(struct inode *inode, struct file *file)
 334 {
 335         return seq_open(file, &service_level_seq_ops);
 336 }
 337
 338 static const struct file_operations service_level_ops = {
 339         .open           = service_level_open,
 340         .read           = seq_read,
 341         .llseek         = seq_lseek,
 342         .release        = seq_release
 343 };
 344
 345 static void service_level_vm_print(struct seq_file *m,
 346                                    struct service_level *slr)
 347 {
 348         char *query_buffer, *str;
 349
 350         query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
 351         if (!query_buffer)
 352                 return;
 353         cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
 354         str = strchr(query_buffer, '\n');
 355         if (str)
 356                 *str = 0;
 357         seq_printf(m, "VM: %s\n", query_buffer);
 358         kfree(query_buffer);
 359 }
 360
 361 static struct service_level service_level_vm = {
 362         .seq_print = service_level_vm_print
 363 };
 364
 365 static __init int create_proc_service_level(void)
 366 {
 367         proc_create("service_levels", 0, NULL, &service_level_ops);
 368         if (MACHINE_IS_VM)
 369                 register_service_level(&service_level_vm);
 370         return 0;
 371 }
 372 subsys_initcall(create_proc_service_level);
 373
 374 /*
 375  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 376  */
 377 void 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) == 0) {
 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, (long) info->capability, 64, long);
 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  */
 421 void 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 }