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         spin_lock(&appldata_ops_lock);
 134         list_for_each(lh, &appldata_ops_list) {
 135                 ops = list_entry(lh, struct appldata_ops, list);
 136                 P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
 137                         ++i, ops->active, ops->name);
 138                 if (ops->active == 1) {
 139                         ops->callback(ops->data);
 140                 }
 141         }
 142         spin_unlock(&appldata_ops_lock);
 143 }
 144
 145 /*
 146  * appldata_diag()
 147  *
 148  * prepare parameter list, issue DIAG 0xDC
 149  */
 150 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 151                         u16 length, char *mod_lvl)
 152 {
 153         struct appldata_product_id id = {
 154                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 155                                0xE7, 0xD2, 0xD9},       /* "LINUXKR" */
 156                 .prod_fn    = 0xD5D3,                   /* "NL" */
 157                 .version_nr = 0xF2F6,                   /* "26" */
 158                 .release_nr = 0xF0F1,                   /* "01" */
 159         };
 160
 161         id.record_nr = record_nr;
 162         id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
 163         return appldata_asm(&id, function, (void *) buffer, length);
 164 }
 165 /************************ timer, work, DIAG <END> ****************************/
 166
 167
 168 /****************************** /proc stuff **********************************/
 169
 170 /*
 171  * appldata_mod_vtimer_wrap()
 172  *
 173  * wrapper function for mod_virt_timer(), because smp_call_function_single()
 174  * accepts only one parameter.
 175  */
 176 static void __appldata_mod_vtimer_wrap(void *p) {
 177         struct {
 178                 struct vtimer_list *timer;
 179                 u64    expires;
 180         } *args = p;
 181         mod_virt_timer(args->timer, args->expires);
 182 }
 183
 184 #define APPLDATA_ADD_TIMER      0
 185 #define APPLDATA_DEL_TIMER      1
 186 #define APPLDATA_MOD_TIMER      2
 187
 188 /*
 189  * __appldata_vtimer_setup()
 190  *
 191  * Add, delete or modify virtual timers on all online cpus.
 192  * The caller needs to get the appldata_timer_lock spinlock.
 193  */
 194 static void
 195 __appldata_vtimer_setup(int cmd)
 196 {
 197         u64 per_cpu_interval;
 198         int i;
 199
 200         switch (cmd) {
 201         case APPLDATA_ADD_TIMER:
 202                 if (appldata_timer_active)
 203                         break;
 204                 per_cpu_interval = (u64) (appldata_interval*1000 /
 205                                           num_online_cpus()) * TOD_MICRO;
 206                 for_each_online_cpu(i) {
 207                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 208                         smp_call_function_single(i, add_virt_timer_periodic,
 209                                                  &per_cpu(appldata_timer, i),
 210                                                  0, 1);
 211                 }
 212                 appldata_timer_active = 1;
 213                 P_INFO("Monitoring timer started.\n");
 214                 break;
 215         case APPLDATA_DEL_TIMER:
 216                 for_each_online_cpu(i)
 217                         del_virt_timer(&per_cpu(appldata_timer, i));
 218                 if (!appldata_timer_active)
 219                         break;
 220                 appldata_timer_active = 0;
 221                 atomic_set(&appldata_expire_count, num_online_cpus());
 222                 P_INFO("Monitoring timer stopped.\n");
 223                 break;
 224         case APPLDATA_MOD_TIMER:
 225                 per_cpu_interval = (u64) (appldata_interval*1000 /
 226                                           num_online_cpus()) * TOD_MICRO;
 227                 if (!appldata_timer_active)
 228                         break;
 229                 for_each_online_cpu(i) {
 230                         struct {
 231                                 struct vtimer_list *timer;
 232                                 u64    expires;
 233                         } args;
 234                         args.timer = &per_cpu(appldata_timer, i);
 235                         args.expires = per_cpu_interval;
 236                         smp_call_function_single(i, __appldata_mod_vtimer_wrap,
 237                                                  &args, 0, 1);
 238                 }
 239         }
 240 }
 241
 242 /*
 243  * appldata_timer_handler()
 244  *
 245  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 246  */
 247 static int
 248 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 249                            void __user *buffer, size_t *lenp, loff_t *ppos)
 250 {
 251         int len;
 252         char buf[2];
 253
 254         if (!*lenp || *ppos) {
 255                 *lenp = 0;
 256                 return 0;
 257         }
 258         if (!write) {
 259                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 260                 if (len > *lenp)
 261                         len = *lenp;
 262                 if (copy_to_user(buffer, buf, len))
 263                         return -EFAULT;
 264                 goto out;
 265         }
 266         len = *lenp;
 267         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 268                 return -EFAULT;
 269         spin_lock(&appldata_timer_lock);
 270         if (buf[0] == '1')
 271                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 272         else if (buf[0] == '0')
 273                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 274         spin_unlock(&appldata_timer_lock);
 275 out:
 276         *lenp = len;
 277         *ppos += len;
 278         return 0;
 279 }
 280
 281 /*
 282  * appldata_interval_handler()
 283  *
 284  * Set (CPU) timer interval for collection of data (in milliseconds), show
 285  * current timer interval.
 286  */
 287 static int
 288 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 289                            void __user *buffer, size_t *lenp, loff_t *ppos)
 290 {
 291         int len, interval;
 292         char buf[16];
 293
 294         if (!*lenp || *ppos) {
 295                 *lenp = 0;
 296                 return 0;
 297         }
 298         if (!write) {
 299                 len = sprintf(buf, "%i\n", appldata_interval);
 300                 if (len > *lenp)
 301                         len = *lenp;
 302                 if (copy_to_user(buffer, buf, len))
 303                         return -EFAULT;
 304                 goto out;
 305         }
 306         len = *lenp;
 307         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 308                 return -EFAULT;
 309         }
 310         interval = 0;
 311         sscanf(buf, "%i", &interval);
 312         if (interval <= 0) {
 313                 P_ERROR("Timer CPU interval has to be > 0!\n");
 314                 return -EINVAL;
 315         }
 316
 317         spin_lock(&appldata_timer_lock);
 318         appldata_interval = interval;
 319         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 320         spin_unlock(&appldata_timer_lock);
 321
 322         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 323                  interval);
 324 out:
 325         *lenp = len;
 326         *ppos += len;
 327         return 0;
 328 }
 329
 330 /*
 331  * appldata_generic_handler()
 332  *
 333  * Generic start/stop monitoring and DIAG, show status of
 334  * monitoring (0 = not in process, 1 = in process)
 335  */
 336 static int
 337 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 338                            void __user *buffer, size_t *lenp, loff_t *ppos)
 339 {
 340         struct appldata_ops *ops = NULL, *tmp_ops;
 341         int rc, len, found;
 342         char buf[2];
 343         struct list_head *lh;
 344
 345         found = 0;
 346         spin_lock(&appldata_ops_lock);
 347         list_for_each(lh, &appldata_ops_list) {
 348                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 349                 if (&tmp_ops->ctl_table[2] == ctl) {
 350                         found = 1;
 351                 }
 352         }
 353         if (!found) {
 354                 spin_unlock(&appldata_ops_lock);
 355                 return -ENODEV;
 356         }
 357         ops = ctl->data;
 358         if (!try_module_get(ops->owner)) {      // protect this function
 359                 spin_unlock(&appldata_ops_lock);
 360                 return -ENODEV;
 361         }
 362         spin_unlock(&appldata_ops_lock);
 363
 364         if (!*lenp || *ppos) {
 365                 *lenp = 0;
 366                 module_put(ops->owner);
 367                 return 0;
 368         }
 369         if (!write) {
 370                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 371                 if (len > *lenp)
 372                         len = *lenp;
 373                 if (copy_to_user(buffer, buf, len)) {
 374                         module_put(ops->owner);
 375                         return -EFAULT;
 376                 }
 377                 goto out;
 378         }
 379         len = *lenp;
 380         if (copy_from_user(buf, buffer,
 381                            len > sizeof(buf) ? sizeof(buf) : len)) {
 382                 module_put(ops->owner);
 383                 return -EFAULT;
 384         }
 385
 386         spin_lock(&appldata_ops_lock);
 387         if ((buf[0] == '1') && (ops->active == 0)) {
 388                 // protect work queue callback
 389                 if (!try_module_get(ops->owner)) {
 390                         spin_unlock(&appldata_ops_lock);
 391                         module_put(ops->owner);
 392                         return -ENODEV;
 393                 }
 394                 ops->callback(ops->data);       // init record
 395                 rc = appldata_diag(ops->record_nr,
 396                                         APPLDATA_START_INTERVAL_REC,
 397                                         (unsigned long) ops->data, ops->size,
 398                                         ops->mod_lvl);
 399                 if (rc != 0) {
 400                         P_ERROR("START DIAG 0xDC for %s failed, "
 401                                 "return code: %d\n", ops->name, rc);
 402                         module_put(ops->owner);
 403                 } else {
 404                         P_INFO("Monitoring %s data enabled, "
 405                                 "DIAG 0xDC started.\n", ops->name);
 406                         ops->active = 1;
 407                 }
 408         } else if ((buf[0] == '0') && (ops->active == 1)) {
 409                 ops->active = 0;
 410                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 411                                 (unsigned long) ops->data, ops->size,
 412                                 ops->mod_lvl);
 413                 if (rc != 0) {
 414                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 415                                 "return code: %d\n", ops->name, rc);
 416                 } else {
 417                         P_INFO("Monitoring %s data disabled, "
 418                                 "DIAG 0xDC stopped.\n", ops->name);
 419                 }
 420                 module_put(ops->owner);
 421         }
 422         spin_unlock(&appldata_ops_lock);
 423 out:
 424         *lenp = len;
 425         *ppos += len;
 426         module_put(ops->owner);
 427         return 0;
 428 }
 429
 430 /*************************** /proc stuff <END> *******************************/
 431
 432
 433 /************************* module-ops management *****************************/
 434 /*
 435  * appldata_register_ops()
 436  *
 437  * update ops list, register /proc/sys entries
 438  */
 439 int appldata_register_ops(struct appldata_ops *ops)
 440 {
 441         if ((ops->size > APPLDATA_MAX_REC_SIZE) || (ops->size < 0))
 442                 return -EINVAL;
 443
 444         ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
 445         if (!ops->ctl_table)
 446                 return -ENOMEM;
 447
 448         spin_lock(&appldata_ops_lock);
 449         list_add(&ops->list, &appldata_ops_list);
 450         spin_unlock(&appldata_ops_lock);
 451
 452         ops->ctl_table[0].procname = appldata_proc_name;
 453         ops->ctl_table[0].maxlen   = 0;
 454         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 455         ops->ctl_table[0].child    = &ops->ctl_table[2];
 456
 457         ops->ctl_table[2].procname = ops->name;
 458         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 459         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 460         ops->ctl_table[2].data = ops;
 461
 462         ops->sysctl_header = register_sysctl_table(ops->ctl_table);
 463         if (!ops->sysctl_header)
 464                 goto out;
 465         P_INFO("%s-ops registered!\n", ops->name);
 466         return 0;
 467 out:
 468         spin_lock(&appldata_ops_lock);
 469         list_del(&ops->list);
 470         spin_unlock(&appldata_ops_lock);
 471         kfree(ops->ctl_table);
 472         return -ENOMEM;
 473 }
 474
 475 /*
 476  * appldata_unregister_ops()
 477  *
 478  * update ops list, unregister /proc entries, stop DIAG if necessary
 479  */
 480 void appldata_unregister_ops(struct appldata_ops *ops)
 481 {
 482         spin_lock(&appldata_ops_lock);
 483         list_del(&ops->list);
 484         spin_unlock(&appldata_ops_lock);
 485         unregister_sysctl_table(ops->sysctl_header);
 486         kfree(ops->ctl_table);
 487         P_INFO("%s-ops unregistered!\n", ops->name);
 488 }
 489 /********************** module-ops management <END> **************************/
 490
 491
 492 /******************************* init / exit *********************************/
 493
 494 static void __cpuinit appldata_online_cpu(int cpu)
 495 {
 496         init_virt_timer(&per_cpu(appldata_timer, cpu));
 497         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 498         per_cpu(appldata_timer, cpu).data = (unsigned long)
 499                 &appldata_work;
 500         atomic_inc(&appldata_expire_count);
 501         spin_lock(&appldata_timer_lock);
 502         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 503         spin_unlock(&appldata_timer_lock);
 504 }
 505
 506 static void __cpuinit appldata_offline_cpu(int cpu)
 507 {
 508         del_virt_timer(&per_cpu(appldata_timer, cpu));
 509         if (atomic_dec_and_test(&appldata_expire_count)) {
 510                 atomic_set(&appldata_expire_count, num_online_cpus());
 511                 queue_work(appldata_wq, &appldata_work);
 512         }
 513         spin_lock(&appldata_timer_lock);
 514         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 515         spin_unlock(&appldata_timer_lock);
 516 }
 517
 518 static int __cpuinit appldata_cpu_notify(struct notifier_block *self,
 519                                          unsigned long action,
 520                                          void *hcpu)
 521 {
 522         switch (action) {
 523         case CPU_ONLINE:
 524         case CPU_ONLINE_FROZEN:
 525                 appldata_online_cpu((long) hcpu);
 526                 break;
 527         case CPU_DEAD:
 528         case CPU_DEAD_FROZEN:
 529                 appldata_offline_cpu((long) hcpu);
 530                 break;
 531         default:
 532                 break;
 533         }
 534         return NOTIFY_OK;
 535 }
 536
 537 static struct notifier_block __cpuinitdata appldata_nb = {
 538         .notifier_call = appldata_cpu_notify,
 539 };
 540
 541 /*
 542  * appldata_init()
 543  *
 544  * init timer, register /proc entries
 545  */
 546 static int __init appldata_init(void)
 547 {
 548         int i;
 549
 550         P_DEBUG("sizeof(parameter_list) = %lu\n",
 551                 sizeof(struct appldata_parameter_list));
 552
 553         appldata_wq = create_singlethread_workqueue("appldata");
 554         if (!appldata_wq) {
 555                 P_ERROR("Could not create work queue\n");
 556                 return -ENOMEM;
 557         }
 558
 559         for_each_online_cpu(i)
 560                 appldata_online_cpu(i);
 561
 562         /* Register cpu hotplug notifier */
 563         register_hotcpu_notifier(&appldata_nb);
 564
 565         appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
 566
 567         P_DEBUG("Base interface initialized.\n");
 568         return 0;
 569 }
 570
 571 __initcall(appldata_init);
 572
 573 /**************************** init / exit <END> ******************************/
 574
 575 EXPORT_SYMBOL_GPL(appldata_register_ops);
 576 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 577 EXPORT_SYMBOL_GPL(appldata_diag);
 578
 579 EXPORT_SYMBOL_GPL(si_swapinfo);
 580 EXPORT_SYMBOL_GPL(nr_threads);
 581 EXPORT_SYMBOL_GPL(nr_running);
 582 EXPORT_SYMBOL_GPL(nr_iowait);