arch/s390/appldata/appldata_base.c

   1 /*
   2  * arch/s390/appldata/appldata_base.c
   3  *
   4  * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
   5  * Exports appldata_register_ops() and appldata_unregister_ops() for the
   6  * data gathering modules.
   7  *
   8  * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   9  *
  10  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/errno.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/mm.h>
  20 #include <linux/swap.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/sysctl.h>
  23 #include <linux/notifier.h>
  24 #include <linux/cpu.h>
  25 #include <linux/workqueue.h>
  26 #include <asm/appldata.h>
  27 #include <asm/timer.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30 #include <asm/smp.h>
  31
  32 #include "appldata.h"
  33
  34
  35 #define MY_PRINT_NAME   "appldata"              /* for debug messages, etc. */
  36 #define APPLDATA_CPU_INTERVAL   10000           /* default (CPU) time for
  37                                                    sampling interval in
  38                                                    milliseconds */
  39
  40 #define TOD_MICRO       0x01000                 /* nr. of TOD clock units
  41                                                    for 1 microsecond */
  42 /*
  43  * /proc entries (sysctl)
  44  */
  45 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
  46 static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
  47                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  48 static int appldata_interval_handler(ctl_table *ctl, int write,
  49                                          struct file *filp,
  50                                          void __user *buffer,
  51                                          size_t *lenp, loff_t *ppos);
  52
  53 static struct ctl_table_header *appldata_sysctl_header;
  54 static struct ctl_table appldata_table[] = {
  55         {
  56                 .procname       = "timer",
  57                 .mode           = S_IRUGO | S_IWUSR,
  58                 .proc_handler   = &appldata_timer_handler,
  59         },
  60         {
  61                 .procname       = "interval",
  62                 .mode           = S_IRUGO | S_IWUSR,
  63                 .proc_handler   = &appldata_interval_handler,
  64         },
  65         { },
  66 };
  67
  68 static struct ctl_table appldata_dir_table[] = {
  69         {
  70                 .procname       = appldata_proc_name,
  71                 .maxlen         = 0,
  72                 .mode           = S_IRUGO | S_IXUGO,
  73                 .child          = appldata_table,
  74         },
  75         { },
  76 };
  77
  78 /*
  79  * Timer
  80  */
  81 static DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
  82 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
  83
  84 static DEFINE_SPINLOCK(appldata_timer_lock);
  85 static int appldata_interval = APPLDATA_CPU_INTERVAL;
  86 static int appldata_timer_active;
  87
  88 /*
  89  * Work queue
  90  */
  91 static struct workqueue_struct *appldata_wq;
  92 static void appldata_work_fn(struct work_struct *work);
  93 static DECLARE_WORK(appldata_work, appldata_work_fn);
  94
  95
  96 /*
  97  * Ops list
  98  */
  99 static DEFINE_SPINLOCK(appldata_ops_lock);
 100 static LIST_HEAD(appldata_ops_list);
 101
 102
 103 /*************************** timer, work, DIAG *******************************/
 104 /*
 105  * appldata_timer_function()
 106  *
 107  * schedule work and reschedule timer
 108  */
 109 static void appldata_timer_function(unsigned long data)
 110 {
 111         P_DEBUG("   -= Timer =-\n");
 112         P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
 113                 atomic_read(&appldata_expire_count));
 114         if (atomic_dec_and_test(&appldata_expire_count)) {
 115                 atomic_set(&appldata_expire_count, num_online_cpus());
 116                 queue_work(appldata_wq, (struct work_struct *) data);
 117         }
 118 }
 119
 120 /*
 121  * appldata_work_fn()
 122  *
 123  * call data gathering function for each (active) module
 124  */
 125 static void appldata_work_fn(struct work_struct *work)
 126 {
 127         struct list_head *lh;
 128         struct appldata_ops *ops;
 129         int i;
 130
 131         P_DEBUG("  -= Work Queue =-\n");
 132         i = 0;
 133         get_online_cpus();
 134         spin_lock(&appldata_ops_lock);
 135         list_for_each(lh, &appldata_ops_list) {
 136                 ops = list_entry(lh, struct appldata_ops, list);
 137                 P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
 138                         ++i, ops->active, ops->name);
 139                 if (ops->active == 1) {
 140                         ops->callback(ops->data);
 141                 }
 142         }
 143         spin_unlock(&appldata_ops_lock);
 144         put_online_cpus();
 145 }
 146
 147 /*
 148  * appldata_diag()
 149  *
 150  * prepare parameter list, issue DIAG 0xDC
 151  */
 152 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 153                         u16 length, char *mod_lvl)
 154 {
 155         struct appldata_product_id id = {
 156                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 157                                0xE7, 0xD2, 0xD9},       /* "LINUXKR" */
 158                 .prod_fn    = 0xD5D3,                   /* "NL" */
 159                 .version_nr = 0xF2F6,                   /* "26" */
 160                 .release_nr = 0xF0F1,                   /* "01" */
 161         };
 162
 163         id.record_nr = record_nr;
 164         id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
 165         return appldata_asm(&id, function, (void *) buffer, length);
 166 }
 167 /************************ timer, work, DIAG <END> ****************************/
 168
 169
 170 /****************************** /proc stuff **********************************/
 171
 172 /*
 173  * appldata_mod_vtimer_wrap()
 174  *
 175  * wrapper function for mod_virt_timer(), because smp_call_function_single()
 176  * accepts only one parameter.
 177  */
 178 static void __appldata_mod_vtimer_wrap(void *p) {
 179         struct {
 180                 struct vtimer_list *timer;
 181                 u64    expires;
 182         } *args = p;
 183         mod_virt_timer(args->timer, args->expires);
 184 }
 185
 186 #define APPLDATA_ADD_TIMER      0
 187 #define APPLDATA_DEL_TIMER      1
 188 #define APPLDATA_MOD_TIMER      2
 189
 190 /*
 191  * __appldata_vtimer_setup()
 192  *
 193  * Add, delete or modify virtual timers on all online cpus.
 194  * The caller needs to get the appldata_timer_lock spinlock.
 195  */
 196 static void
 197 __appldata_vtimer_setup(int cmd)
 198 {
 199         u64 per_cpu_interval;
 200         int i;
 201
 202         switch (cmd) {
 203         case APPLDATA_ADD_TIMER:
 204                 if (appldata_timer_active)
 205                         break;
 206                 per_cpu_interval = (u64) (appldata_interval*1000 /
 207                                           num_online_cpus()) * TOD_MICRO;
 208                 for_each_online_cpu(i) {
 209                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 210                         smp_call_function_single(i, add_virt_timer_periodic,
 211                                                  &per_cpu(appldata_timer, i),
 212                                                  0, 1);
 213                 }
 214                 appldata_timer_active = 1;
 215                 P_INFO("Monitoring timer started.\n");
 216                 break;
 217         case APPLDATA_DEL_TIMER:
 218                 for_each_online_cpu(i)
 219                         del_virt_timer(&per_cpu(appldata_timer, i));
 220                 if (!appldata_timer_active)
 221                         break;
 222                 appldata_timer_active = 0;
 223                 atomic_set(&appldata_expire_count, num_online_cpus());
 224                 P_INFO("Monitoring timer stopped.\n");
 225                 break;
 226         case APPLDATA_MOD_TIMER:
 227                 per_cpu_interval = (u64) (appldata_interval*1000 /
 228                                           num_online_cpus()) * TOD_MICRO;
 229                 if (!appldata_timer_active)
 230                         break;
 231                 for_each_online_cpu(i) {
 232                         struct {
 233                                 struct vtimer_list *timer;
 234                                 u64    expires;
 235                         } args;
 236                         args.timer = &per_cpu(appldata_timer, i);
 237                         args.expires = per_cpu_interval;
 238                         smp_call_function_single(i, __appldata_mod_vtimer_wrap,
 239                                                  &args, 0, 1);
 240                 }
 241         }
 242 }
 243
 244 /*
 245  * appldata_timer_handler()
 246  *
 247  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 248  */
 249 static int
 250 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 251                            void __user *buffer, size_t *lenp, loff_t *ppos)
 252 {
 253         int len;
 254         char buf[2];
 255
 256         if (!*lenp || *ppos) {
 257                 *lenp = 0;
 258                 return 0;
 259         }
 260         if (!write) {
 261                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 262                 if (len > *lenp)
 263                         len = *lenp;
 264                 if (copy_to_user(buffer, buf, len))
 265                         return -EFAULT;
 266                 goto out;
 267         }
 268         len = *lenp;
 269         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 270                 return -EFAULT;
 271         get_online_cpus();
 272         spin_lock(&appldata_timer_lock);
 273         if (buf[0] == '1')
 274                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 275         else if (buf[0] == '0')
 276                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 277         spin_unlock(&appldata_timer_lock);
 278         put_online_cpus();
 279 out:
 280         *lenp = len;
 281         *ppos += len;
 282         return 0;
 283 }
 284
 285 /*
 286  * appldata_interval_handler()
 287  *
 288  * Set (CPU) timer interval for collection of data (in milliseconds), show
 289  * current timer interval.
 290  */
 291 static int
 292 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 293                            void __user *buffer, size_t *lenp, loff_t *ppos)
 294 {
 295         int len, interval;
 296         char buf[16];
 297
 298         if (!*lenp || *ppos) {
 299                 *lenp = 0;
 300                 return 0;
 301         }
 302         if (!write) {
 303                 len = sprintf(buf, "%i\n", appldata_interval);
 304                 if (len > *lenp)
 305                         len = *lenp;
 306                 if (copy_to_user(buffer, buf, len))
 307                         return -EFAULT;
 308                 goto out;
 309         }
 310         len = *lenp;
 311         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 312                 return -EFAULT;
 313         }
 314         interval = 0;
 315         sscanf(buf, "%i", &interval);
 316         if (interval <= 0) {
 317                 P_ERROR("Timer CPU interval has to be > 0!\n");
 318                 return -EINVAL;
 319         }
 320
 321         get_online_cpus();
 322         spin_lock(&appldata_timer_lock);
 323         appldata_interval = interval;
 324         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 325         spin_unlock(&appldata_timer_lock);
 326         put_online_cpus();
 327
 328         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 329                  interval);
 330 out:
 331         *lenp = len;
 332         *ppos += len;
 333         return 0;
 334 }
 335
 336 /*
 337  * appldata_generic_handler()
 338  *
 339  * Generic start/stop monitoring and DIAG, show status of
 340  * monitoring (0 = not in process, 1 = in process)
 341  */
 342 static int
 343 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 344                            void __user *buffer, size_t *lenp, loff_t *ppos)
 345 {
 346         struct appldata_ops *ops = NULL, *tmp_ops;
 347         int rc, len, found;
 348         char buf[2];
 349         struct list_head *lh;
 350
 351         found = 0;
 352         spin_lock(&appldata_ops_lock);
 353         list_for_each(lh, &appldata_ops_list) {
 354                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 355                 if (&tmp_ops->ctl_table[2] == ctl) {
 356                         found = 1;
 357                 }
 358         }
 359         if (!found) {
 360                 spin_unlock(&appldata_ops_lock);
 361                 return -ENODEV;
 362         }
 363         ops = ctl->data;
 364         if (!try_module_get(ops->owner)) {      // protect this function
 365                 spin_unlock(&appldata_ops_lock);
 366                 return -ENODEV;
 367         }
 368         spin_unlock(&appldata_ops_lock);
 369
 370         if (!*lenp || *ppos) {
 371                 *lenp = 0;
 372                 module_put(ops->owner);
 373                 return 0;
 374         }
 375         if (!write) {
 376                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 377                 if (len > *lenp)
 378                         len = *lenp;
 379                 if (copy_to_user(buffer, buf, len)) {
 380                         module_put(ops->owner);
 381                         return -EFAULT;
 382                 }
 383                 goto out;
 384         }
 385         len = *lenp;
 386         if (copy_from_user(buf, buffer,
 387                            len > sizeof(buf) ? sizeof(buf) : len)) {
 388                 module_put(ops->owner);
 389                 return -EFAULT;
 390         }
 391
 392         spin_lock(&appldata_ops_lock);
 393         if ((buf[0] == '1') && (ops->active == 0)) {
 394                 // protect work queue callback
 395                 if (!try_module_get(ops->owner)) {
 396                         spin_unlock(&appldata_ops_lock);
 397                         module_put(ops->owner);
 398                         return -ENODEV;
 399                 }
 400                 ops->callback(ops->data);       // init record
 401                 rc = appldata_diag(ops->record_nr,
 402                                         APPLDATA_START_INTERVAL_REC,
 403                                         (unsigned long) ops->data, ops->size,
 404                                         ops->mod_lvl);
 405                 if (rc != 0) {
 406                         P_ERROR("START DIAG 0xDC for %s failed, "
 407                                 "return code: %d\n", ops->name, rc);
 408                         module_put(ops->owner);
 409                 } else {
 410                         P_INFO("Monitoring %s data enabled, "
 411                                 "DIAG 0xDC started.\n", ops->name);
 412                         ops->active = 1;
 413                 }
 414         } else if ((buf[0] == '0') && (ops->active == 1)) {
 415                 ops->active = 0;
 416                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 417                                 (unsigned long) ops->data, ops->size,
 418                                 ops->mod_lvl);
 419                 if (rc != 0) {
 420                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 421                                 "return code: %d\n", ops->name, rc);
 422                 } else {
 423                         P_INFO("Monitoring %s data disabled, "
 424                                 "DIAG 0xDC stopped.\n", ops->name);
 425                 }
 426                 module_put(ops->owner);
 427         }
 428         spin_unlock(&appldata_ops_lock);
 429 out:
 430         *lenp = len;
 431         *ppos += len;
 432         module_put(ops->owner);
 433         return 0;
 434 }
 435
 436 /*************************** /proc stuff <END> *******************************/
 437
 438
 439 /************************* module-ops management *****************************/
 440 /*
 441  * appldata_register_ops()
 442  *
 443  * update ops list, register /proc/sys entries
 444  */
 445 int appldata_register_ops(struct appldata_ops *ops)
 446 {
 447         if ((ops->size > APPLDATA_MAX_REC_SIZE) || (ops->size < 0))
 448                 return -EINVAL;
 449
 450         ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
 451         if (!ops->ctl_table)
 452                 return -ENOMEM;
 453
 454         spin_lock(&appldata_ops_lock);
 455         list_add(&ops->list, &appldata_ops_list);
 456         spin_unlock(&appldata_ops_lock);
 457
 458         ops->ctl_table[0].procname = appldata_proc_name;
 459         ops->ctl_table[0].maxlen   = 0;
 460         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 461         ops->ctl_table[0].child    = &ops->ctl_table[2];
 462
 463         ops->ctl_table[2].procname = ops->name;
 464         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 465         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 466         ops->ctl_table[2].data = ops;
 467
 468         ops->sysctl_header = register_sysctl_table(ops->ctl_table);
 469         if (!ops->sysctl_header)
 470                 goto out;
 471         P_INFO("%s-ops registered!\n", ops->name);
 472         return 0;
 473 out:
 474         spin_lock(&appldata_ops_lock);
 475         list_del(&ops->list);
 476         spin_unlock(&appldata_ops_lock);
 477         kfree(ops->ctl_table);
 478         return -ENOMEM;
 479 }
 480
 481 /*
 482  * appldata_unregister_ops()
 483  *
 484  * update ops list, unregister /proc entries, stop DIAG if necessary
 485  */
 486 void appldata_unregister_ops(struct appldata_ops *ops)
 487 {
 488         spin_lock(&appldata_ops_lock);
 489         list_del(&ops->list);
 490         spin_unlock(&appldata_ops_lock);
 491         unregister_sysctl_table(ops->sysctl_header);
 492         kfree(ops->ctl_table);
 493         P_INFO("%s-ops unregistered!\n", ops->name);
 494 }
 495 /********************** module-ops management <END> **************************/
 496
 497
 498 /******************************* init / exit *********************************/
 499
 500 static void __cpuinit appldata_online_cpu(int cpu)
 501 {
 502         init_virt_timer(&per_cpu(appldata_timer, cpu));
 503         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 504         per_cpu(appldata_timer, cpu).data = (unsigned long)
 505                 &appldata_work;
 506         atomic_inc(&appldata_expire_count);
 507         spin_lock(&appldata_timer_lock);
 508         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 509         spin_unlock(&appldata_timer_lock);
 510 }
 511
 512 static void __cpuinit appldata_offline_cpu(int cpu)
 513 {
 514         del_virt_timer(&per_cpu(appldata_timer, cpu));
 515         if (atomic_dec_and_test(&appldata_expire_count)) {
 516                 atomic_set(&appldata_expire_count, num_online_cpus());
 517                 queue_work(appldata_wq, &appldata_work);
 518         }
 519         spin_lock(&appldata_timer_lock);
 520         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 521         spin_unlock(&appldata_timer_lock);
 522 }
 523
 524 static int __cpuinit appldata_cpu_notify(struct notifier_block *self,
 525                                          unsigned long action,
 526                                          void *hcpu)
 527 {
 528         switch (action) {
 529         case CPU_ONLINE:
 530         case CPU_ONLINE_FROZEN:
 531                 appldata_online_cpu((long) hcpu);
 532                 break;
 533         case CPU_DEAD:
 534         case CPU_DEAD_FROZEN:
 535                 appldata_offline_cpu((long) hcpu);
 536                 break;
 537         default:
 538                 break;
 539         }
 540         return NOTIFY_OK;
 541 }
 542
 543 static struct notifier_block __cpuinitdata appldata_nb = {
 544         .notifier_call = appldata_cpu_notify,
 545 };
 546
 547 /*
 548  * appldata_init()
 549  *
 550  * init timer, register /proc entries
 551  */
 552 static int __init appldata_init(void)
 553 {
 554         int i;
 555
 556         P_DEBUG("sizeof(parameter_list) = %lu\n",
 557                 sizeof(struct appldata_parameter_list));
 558
 559         appldata_wq = create_singlethread_workqueue("appldata");
 560         if (!appldata_wq) {
 561                 P_ERROR("Could not create work queue\n");
 562                 return -ENOMEM;
 563         }
 564
 565         get_online_cpus();
 566         for_each_online_cpu(i)
 567                 appldata_online_cpu(i);
 568         put_online_cpus();
 569
 570         /* Register cpu hotplug notifier */
 571         register_hotcpu_notifier(&appldata_nb);
 572
 573         appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
 574
 575         P_DEBUG("Base interface initialized.\n");
 576         return 0;
 577 }
 578
 579 __initcall(appldata_init);
 580
 581 /**************************** init / exit <END> ******************************/
 582
 583 EXPORT_SYMBOL_GPL(appldata_register_ops);
 584 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 585 EXPORT_SYMBOL_GPL(appldata_diag);
 586
 587 EXPORT_SYMBOL_GPL(si_swapinfo);
 588 EXPORT_SYMBOL_GPL(nr_threads);
 589 EXPORT_SYMBOL_GPL(nr_running);
 590 EXPORT_SYMBOL_GPL(nr_iowait);