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 <asm/uaccess.h>
  18 #include <asm/io.h>
  19 #include <asm/smp.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/page-flags.h>
  23 #include <linux/swap.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/sysctl.h>
  26 #include <asm/timer.h>
  27 //#include <linux/kernel_stat.h>
  28 #include <linux/notifier.h>
  29 #include <linux/cpu.h>
  30 #include <linux/workqueue.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 /*
  44  * Parameter list for DIAGNOSE X'DC'
  45  */
  46 #ifndef CONFIG_64BIT
  47 struct appldata_parameter_list {
  48         u16 diag;               /* The DIAGNOSE code X'00DC'          */
  49         u8  function;           /* The function code for the DIAGNOSE */
  50         u8  parlist_length;     /* Length of the parameter list       */
  51         u32 product_id_addr;    /* Address of the 16-byte product ID  */
  52         u16 reserved;
  53         u16 buffer_length;      /* Length of the application data buffer  */
  54         u32 buffer_addr;        /* Address of the application data buffer */
  55 };
  56 #else
  57 struct appldata_parameter_list {
  58         u16 diag;
  59         u8  function;
  60         u8  parlist_length;
  61         u32 unused01;
  62         u16 reserved;
  63         u16 buffer_length;
  64         u32 unused02;
  65         u64 product_id_addr;
  66         u64 buffer_addr;
  67 };
  68 #endif /* CONFIG_64BIT */
  69
  70 /*
  71  * /proc entries (sysctl)
  72  */
  73 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
  74 static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
  75                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  76 static int appldata_interval_handler(ctl_table *ctl, int write,
  77                                          struct file *filp,
  78                                          void __user *buffer,
  79                                          size_t *lenp, loff_t *ppos);
  80
  81 static struct ctl_table_header *appldata_sysctl_header;
  82 static struct ctl_table appldata_table[] = {
  83         {
  84                 .ctl_name       = CTL_APPLDATA_TIMER,
  85                 .procname       = "timer",
  86                 .mode           = S_IRUGO | S_IWUSR,
  87                 .proc_handler   = &appldata_timer_handler,
  88         },
  89         {
  90                 .ctl_name       = CTL_APPLDATA_INTERVAL,
  91                 .procname       = "interval",
  92                 .mode           = S_IRUGO | S_IWUSR,
  93                 .proc_handler   = &appldata_interval_handler,
  94         },
  95         { .ctl_name = 0 }
  96 };
  97
  98 static struct ctl_table appldata_dir_table[] = {
  99         {
 100                 .ctl_name       = CTL_APPLDATA,
 101                 .procname       = appldata_proc_name,
 102                 .maxlen         = 0,
 103                 .mode           = S_IRUGO | S_IXUGO,
 104                 .child          = appldata_table,
 105         },
 106         { .ctl_name = 0 }
 107 };
 108
 109 /*
 110  * Timer
 111  */
 112 DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
 113 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
 114
 115 static DEFINE_SPINLOCK(appldata_timer_lock);
 116 static int appldata_interval = APPLDATA_CPU_INTERVAL;
 117 static int appldata_timer_active;
 118
 119 /*
 120  * Work queue
 121  */
 122 static struct workqueue_struct *appldata_wq;
 123 static void appldata_work_fn(void *data);
 124 static DECLARE_WORK(appldata_work, appldata_work_fn, NULL);
 125
 126
 127 /*
 128  * Ops list
 129  */
 130 static DEFINE_SPINLOCK(appldata_ops_lock);
 131 static LIST_HEAD(appldata_ops_list);
 132
 133
 134 /*************************** timer, work, DIAG *******************************/
 135 /*
 136  * appldata_timer_function()
 137  *
 138  * schedule work and reschedule timer
 139  */
 140 static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
 141 {
 142         P_DEBUG("   -= Timer =-\n");
 143         P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
 144                 atomic_read(&appldata_expire_count));
 145         if (atomic_dec_and_test(&appldata_expire_count)) {
 146                 atomic_set(&appldata_expire_count, num_online_cpus());
 147                 queue_work(appldata_wq, (struct work_struct *) data);
 148         }
 149 }
 150
 151 /*
 152  * appldata_work_fn()
 153  *
 154  * call data gathering function for each (active) module
 155  */
 156 static void appldata_work_fn(void *data)
 157 {
 158         struct list_head *lh;
 159         struct appldata_ops *ops;
 160         int i;
 161
 162         P_DEBUG("  -= Work Queue =-\n");
 163         i = 0;
 164         spin_lock(&appldata_ops_lock);
 165         list_for_each(lh, &appldata_ops_list) {
 166                 ops = list_entry(lh, struct appldata_ops, list);
 167                 P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
 168                         ++i, ops->active, ops->name);
 169                 if (ops->active == 1) {
 170                         ops->callback(ops->data);
 171                 }
 172         }
 173         spin_unlock(&appldata_ops_lock);
 174 }
 175
 176 /*
 177  * appldata_diag()
 178  *
 179  * prepare parameter list, issue DIAG 0xDC
 180  */
 181 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 182                         u16 length, char *mod_lvl)
 183 {
 184         unsigned long ry;
 185         struct appldata_product_id {
 186                 char prod_nr[7];                        /* product nr. */
 187                 char prod_fn[2];                        /* product function */
 188                 char record_nr;                         /* record nr. */
 189                 char version_nr[2];                     /* version */
 190                 char release_nr[2];                     /* release */
 191                 char mod_lvl[2];                        /* modification lvl. */
 192         } appldata_product_id = {
 193         /* all strings are EBCDIC, record_nr is byte */
 194                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 195                                 0xE7, 0xD2, 0xD9},      /* "LINUXKR" */
 196                 .prod_fn    = {0xD5, 0xD3},             /* "NL" */
 197                 .record_nr  = record_nr,
 198                 .version_nr = {0xF2, 0xF6},             /* "26" */
 199                 .release_nr = {0xF0, 0xF1},             /* "01" */
 200                 .mod_lvl    = {mod_lvl[0], mod_lvl[1]},
 201         };
 202         struct appldata_parameter_list appldata_parameter_list = {
 203                                 .diag = 0xDC,
 204                                 .function = function,
 205                                 .parlist_length =
 206                                         sizeof(appldata_parameter_list),
 207                                 .buffer_length = length,
 208                                 .product_id_addr =
 209                                         (unsigned long) &appldata_product_id,
 210                                 .buffer_addr = virt_to_phys((void *) buffer)
 211         };
 212
 213         if (!MACHINE_IS_VM)
 214                 return -ENOSYS;
 215         ry = -1;
 216         asm volatile(
 217                         "diag %1,%0,0xDC\n\t"
 218                         : "=d" (ry)
 219                         : "d" (&appldata_parameter_list),
 220                           "m" (appldata_parameter_list),
 221                           "m" (appldata_product_id)
 222                         : "cc");
 223         return (int) ry;
 224 }
 225 /************************ timer, work, DIAG <END> ****************************/
 226
 227
 228 /****************************** /proc stuff **********************************/
 229
 230 /*
 231  * appldata_mod_vtimer_wrap()
 232  *
 233  * wrapper function for mod_virt_timer(), because smp_call_function_on()
 234  * accepts only one parameter.
 235  */
 236 static void __appldata_mod_vtimer_wrap(void *p) {
 237         struct {
 238                 struct vtimer_list *timer;
 239                 u64    expires;
 240         } *args = p;
 241         mod_virt_timer(args->timer, args->expires);
 242 }
 243
 244 #define APPLDATA_ADD_TIMER      0
 245 #define APPLDATA_DEL_TIMER      1
 246 #define APPLDATA_MOD_TIMER      2
 247
 248 /*
 249  * __appldata_vtimer_setup()
 250  *
 251  * Add, delete or modify virtual timers on all online cpus.
 252  * The caller needs to get the appldata_timer_lock spinlock.
 253  */
 254 static void
 255 __appldata_vtimer_setup(int cmd)
 256 {
 257         u64 per_cpu_interval;
 258         int i;
 259
 260         switch (cmd) {
 261         case APPLDATA_ADD_TIMER:
 262                 if (appldata_timer_active)
 263                         break;
 264                 per_cpu_interval = (u64) (appldata_interval*1000 /
 265                                           num_online_cpus()) * TOD_MICRO;
 266                 for_each_online_cpu(i) {
 267                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 268                         smp_call_function_on(add_virt_timer_periodic,
 269                                              &per_cpu(appldata_timer, i),
 270                                              0, 1, i);
 271                 }
 272                 appldata_timer_active = 1;
 273                 P_INFO("Monitoring timer started.\n");
 274                 break;
 275         case APPLDATA_DEL_TIMER:
 276                 for_each_online_cpu(i)
 277                         del_virt_timer(&per_cpu(appldata_timer, i));
 278                 if (!appldata_timer_active)
 279                         break;
 280                 appldata_timer_active = 0;
 281                 atomic_set(&appldata_expire_count, num_online_cpus());
 282                 P_INFO("Monitoring timer stopped.\n");
 283                 break;
 284         case APPLDATA_MOD_TIMER:
 285                 per_cpu_interval = (u64) (appldata_interval*1000 /
 286                                           num_online_cpus()) * TOD_MICRO;
 287                 if (!appldata_timer_active)
 288                         break;
 289                 for_each_online_cpu(i) {
 290                         struct {
 291                                 struct vtimer_list *timer;
 292                                 u64    expires;
 293                         } args;
 294                         args.timer = &per_cpu(appldata_timer, i);
 295                         args.expires = per_cpu_interval;
 296                         smp_call_function_on(__appldata_mod_vtimer_wrap,
 297                                              &args, 0, 1, i);
 298                 }
 299         }
 300 }
 301
 302 /*
 303  * appldata_timer_handler()
 304  *
 305  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 306  */
 307 static int
 308 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 309                            void __user *buffer, size_t *lenp, loff_t *ppos)
 310 {
 311         int len;
 312         char buf[2];
 313
 314         if (!*lenp || *ppos) {
 315                 *lenp = 0;
 316                 return 0;
 317         }
 318         if (!write) {
 319                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 320                 if (len > *lenp)
 321                         len = *lenp;
 322                 if (copy_to_user(buffer, buf, len))
 323                         return -EFAULT;
 324                 goto out;
 325         }
 326         len = *lenp;
 327         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 328                 return -EFAULT;
 329         spin_lock(&appldata_timer_lock);
 330         if (buf[0] == '1')
 331                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 332         else if (buf[0] == '0')
 333                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 334         spin_unlock(&appldata_timer_lock);
 335 out:
 336         *lenp = len;
 337         *ppos += len;
 338         return 0;
 339 }
 340
 341 /*
 342  * appldata_interval_handler()
 343  *
 344  * Set (CPU) timer interval for collection of data (in milliseconds), show
 345  * current timer interval.
 346  */
 347 static int
 348 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 349                            void __user *buffer, size_t *lenp, loff_t *ppos)
 350 {
 351         int len, interval;
 352         char buf[16];
 353
 354         if (!*lenp || *ppos) {
 355                 *lenp = 0;
 356                 return 0;
 357         }
 358         if (!write) {
 359                 len = sprintf(buf, "%i\n", appldata_interval);
 360                 if (len > *lenp)
 361                         len = *lenp;
 362                 if (copy_to_user(buffer, buf, len))
 363                         return -EFAULT;
 364                 goto out;
 365         }
 366         len = *lenp;
 367         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 368                 return -EFAULT;
 369         }
 370         sscanf(buf, "%i", &interval);
 371         if (interval <= 0) {
 372                 P_ERROR("Timer CPU interval has to be > 0!\n");
 373                 return -EINVAL;
 374         }
 375
 376         spin_lock(&appldata_timer_lock);
 377         appldata_interval = interval;
 378         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 379         spin_unlock(&appldata_timer_lock);
 380
 381         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 382                  interval);
 383 out:
 384         *lenp = len;
 385         *ppos += len;
 386         return 0;
 387 }
 388
 389 /*
 390  * appldata_generic_handler()
 391  *
 392  * Generic start/stop monitoring and DIAG, show status of
 393  * monitoring (0 = not in process, 1 = in process)
 394  */
 395 static int
 396 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 397                            void __user *buffer, size_t *lenp, loff_t *ppos)
 398 {
 399         struct appldata_ops *ops = NULL, *tmp_ops;
 400         int rc, len, found;
 401         char buf[2];
 402         struct list_head *lh;
 403
 404         found = 0;
 405         spin_lock(&appldata_ops_lock);
 406         list_for_each(lh, &appldata_ops_list) {
 407                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 408                 if (&tmp_ops->ctl_table[2] == ctl) {
 409                         found = 1;
 410                 }
 411         }
 412         if (!found) {
 413                 spin_unlock(&appldata_ops_lock);
 414                 return -ENODEV;
 415         }
 416         ops = ctl->data;
 417         if (!try_module_get(ops->owner)) {      // protect this function
 418                 spin_unlock(&appldata_ops_lock);
 419                 return -ENODEV;
 420         }
 421         spin_unlock(&appldata_ops_lock);
 422
 423         if (!*lenp || *ppos) {
 424                 *lenp = 0;
 425                 module_put(ops->owner);
 426                 return 0;
 427         }
 428         if (!write) {
 429                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 430                 if (len > *lenp)
 431                         len = *lenp;
 432                 if (copy_to_user(buffer, buf, len)) {
 433                         module_put(ops->owner);
 434                         return -EFAULT;
 435                 }
 436                 goto out;
 437         }
 438         len = *lenp;
 439         if (copy_from_user(buf, buffer,
 440                            len > sizeof(buf) ? sizeof(buf) : len)) {
 441                 module_put(ops->owner);
 442                 return -EFAULT;
 443         }
 444
 445         spin_lock(&appldata_ops_lock);
 446         if ((buf[0] == '1') && (ops->active == 0)) {
 447                 // protect work queue callback
 448                 if (!try_module_get(ops->owner)) {
 449                         spin_unlock(&appldata_ops_lock);
 450                         module_put(ops->owner);
 451                         return -ENODEV;
 452                 }
 453                 ops->callback(ops->data);       // init record
 454                 rc = appldata_diag(ops->record_nr,
 455                                         APPLDATA_START_INTERVAL_REC,
 456                                         (unsigned long) ops->data, ops->size,
 457                                         ops->mod_lvl);
 458                 if (rc != 0) {
 459                         P_ERROR("START DIAG 0xDC for %s failed, "
 460                                 "return code: %d\n", ops->name, rc);
 461                         module_put(ops->owner);
 462                 } else {
 463                         P_INFO("Monitoring %s data enabled, "
 464                                 "DIAG 0xDC started.\n", ops->name);
 465                         ops->active = 1;
 466                 }
 467         } else if ((buf[0] == '0') && (ops->active == 1)) {
 468                 ops->active = 0;
 469                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 470                                 (unsigned long) ops->data, ops->size,
 471                                 ops->mod_lvl);
 472                 if (rc != 0) {
 473                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 474                                 "return code: %d\n", ops->name, rc);
 475                 } else {
 476                         P_INFO("Monitoring %s data disabled, "
 477                                 "DIAG 0xDC stopped.\n", ops->name);
 478                 }
 479                 module_put(ops->owner);
 480         }
 481         spin_unlock(&appldata_ops_lock);
 482 out:
 483         *lenp = len;
 484         *ppos += len;
 485         module_put(ops->owner);
 486         return 0;
 487 }
 488
 489 /*************************** /proc stuff <END> *******************************/
 490
 491
 492 /************************* module-ops management *****************************/
 493 /*
 494  * appldata_register_ops()
 495  *
 496  * update ops list, register /proc/sys entries
 497  */
 498 int appldata_register_ops(struct appldata_ops *ops)
 499 {
 500         struct list_head *lh;
 501         struct appldata_ops *tmp_ops;
 502         int i;
 503
 504         i = 0;
 505
 506         if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
 507                 (ops->size < 0)){
 508                 P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
 509                         ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
 510                 return -ENOMEM;
 511         }
 512         if ((ops->ctl_nr == CTL_APPLDATA) ||
 513             (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
 514             (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
 515                 P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
 516                 return -EBUSY;
 517         }
 518         ops->ctl_table = kzalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
 519         if (ops->ctl_table == NULL) {
 520                 P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
 521                 return -ENOMEM;
 522         }
 523
 524         spin_lock(&appldata_ops_lock);
 525         list_for_each(lh, &appldata_ops_list) {
 526                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 527                 P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
 528                         ++i, tmp_ops->name, tmp_ops->ctl_nr);
 529                 P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
 530                         tmp_ops->name, tmp_ops->ctl_nr, ops->name,
 531                         ops->ctl_nr);
 532                 if (strncmp(tmp_ops->name, ops->name,
 533                                 APPLDATA_PROC_NAME_LENGTH) == 0) {
 534                         P_ERROR("Name \"%s\" already registered!\n", ops->name);
 535                         kfree(ops->ctl_table);
 536                         spin_unlock(&appldata_ops_lock);
 537                         return -EBUSY;
 538                 }
 539                 if (tmp_ops->ctl_nr == ops->ctl_nr) {
 540                         P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
 541                         kfree(ops->ctl_table);
 542                         spin_unlock(&appldata_ops_lock);
 543                         return -EBUSY;
 544                 }
 545         }
 546         list_add(&ops->list, &appldata_ops_list);
 547         spin_unlock(&appldata_ops_lock);
 548
 549         ops->ctl_table[0].ctl_name = CTL_APPLDATA;
 550         ops->ctl_table[0].procname = appldata_proc_name;
 551         ops->ctl_table[0].maxlen   = 0;
 552         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 553         ops->ctl_table[0].child    = &ops->ctl_table[2];
 554
 555         ops->ctl_table[1].ctl_name = 0;
 556
 557         ops->ctl_table[2].ctl_name = ops->ctl_nr;
 558         ops->ctl_table[2].procname = ops->name;
 559         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 560         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 561         ops->ctl_table[2].data = ops;
 562
 563         ops->ctl_table[3].ctl_name = 0;
 564
 565         ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
 566
 567         P_INFO("%s-ops registered!\n", ops->name);
 568         return 0;
 569 }
 570
 571 /*
 572  * appldata_unregister_ops()
 573  *
 574  * update ops list, unregister /proc entries, stop DIAG if necessary
 575  */
 576 void appldata_unregister_ops(struct appldata_ops *ops)
 577 {
 578         void *table;
 579         spin_lock(&appldata_ops_lock);
 580         list_del(&ops->list);
 581         /* at that point any incoming access will fail */
 582         table = ops->ctl_table;
 583         ops->ctl_table = NULL;
 584         spin_unlock(&appldata_ops_lock);
 585         unregister_sysctl_table(ops->sysctl_header);
 586         kfree(table);
 587         P_INFO("%s-ops unregistered!\n", ops->name);
 588 }
 589 /********************** module-ops management <END> **************************/
 590
 591
 592 /******************************* init / exit *********************************/
 593
 594 static void
 595 appldata_online_cpu(int cpu)
 596 {
 597         init_virt_timer(&per_cpu(appldata_timer, cpu));
 598         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 599         per_cpu(appldata_timer, cpu).data = (unsigned long)
 600                 &appldata_work;
 601         atomic_inc(&appldata_expire_count);
 602         spin_lock(&appldata_timer_lock);
 603         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 604         spin_unlock(&appldata_timer_lock);
 605 }
 606
 607 static void
 608 appldata_offline_cpu(int cpu)
 609 {
 610         del_virt_timer(&per_cpu(appldata_timer, cpu));
 611         if (atomic_dec_and_test(&appldata_expire_count)) {
 612                 atomic_set(&appldata_expire_count, num_online_cpus());
 613                 queue_work(appldata_wq, &appldata_work);
 614         }
 615         spin_lock(&appldata_timer_lock);
 616         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 617         spin_unlock(&appldata_timer_lock);
 618 }
 619
 620 static int __cpuinit
 621 appldata_cpu_notify(struct notifier_block *self,
 622                     unsigned long action, void *hcpu)
 623 {
 624         switch (action) {
 625         case CPU_ONLINE:
 626                 appldata_online_cpu((long) hcpu);
 627                 break;
 628 #ifdef CONFIG_HOTPLUG_CPU
 629         case CPU_DEAD:
 630                 appldata_offline_cpu((long) hcpu);
 631                 break;
 632 #endif
 633         default:
 634                 break;
 635         }
 636         return NOTIFY_OK;
 637 }
 638
 639 static struct notifier_block __devinitdata appldata_nb = {
 640         .notifier_call = appldata_cpu_notify,
 641 };
 642
 643 /*
 644  * appldata_init()
 645  *
 646  * init timer, register /proc entries
 647  */
 648 static int __init appldata_init(void)
 649 {
 650         int i;
 651
 652         P_DEBUG("sizeof(parameter_list) = %lu\n",
 653                 sizeof(struct appldata_parameter_list));
 654
 655         appldata_wq = create_singlethread_workqueue("appldata");
 656         if (!appldata_wq) {
 657                 P_ERROR("Could not create work queue\n");
 658                 return -ENOMEM;
 659         }
 660
 661         for_each_online_cpu(i)
 662                 appldata_online_cpu(i);
 663
 664         /* Register cpu hotplug notifier */
 665         register_cpu_notifier(&appldata_nb);
 666
 667         appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
 668 #ifdef MODULE
 669         appldata_dir_table[0].de->owner = THIS_MODULE;
 670         appldata_table[0].de->owner = THIS_MODULE;
 671         appldata_table[1].de->owner = THIS_MODULE;
 672 #endif
 673
 674         P_DEBUG("Base interface initialized.\n");
 675         return 0;
 676 }
 677
 678 /*
 679  * appldata_exit()
 680  *
 681  * stop timer, unregister /proc entries
 682  */
 683 static void __exit appldata_exit(void)
 684 {
 685         struct list_head *lh;
 686         struct appldata_ops *ops;
 687         int rc, i;
 688
 689         P_DEBUG("Unloading module ...\n");
 690         /*
 691          * ops list should be empty, but just in case something went wrong...
 692          */
 693         spin_lock(&appldata_ops_lock);
 694         list_for_each(lh, &appldata_ops_list) {
 695                 ops = list_entry(lh, struct appldata_ops, list);
 696                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 697                                 (unsigned long) ops->data, ops->size,
 698                                 ops->mod_lvl);
 699                 if (rc != 0) {
 700                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 701                                 "return code: %d\n", ops->name, rc);
 702                 }
 703         }
 704         spin_unlock(&appldata_ops_lock);
 705
 706         for_each_online_cpu(i)
 707                 appldata_offline_cpu(i);
 708
 709         appldata_timer_active = 0;
 710
 711         unregister_sysctl_table(appldata_sysctl_header);
 712
 713         destroy_workqueue(appldata_wq);
 714         P_DEBUG("... module unloaded!\n");
 715 }
 716 /**************************** init / exit <END> ******************************/
 717
 718
 719 module_init(appldata_init);
 720 module_exit(appldata_exit);
 721 MODULE_LICENSE("GPL");
 722 MODULE_AUTHOR("Gerald Schaefer");
 723 MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
 724
 725 EXPORT_SYMBOL_GPL(appldata_register_ops);
 726 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 727 EXPORT_SYMBOL_GPL(appldata_diag);
 728
 729 #ifdef MODULE
 730 /*
 731  * Kernel symbols needed by appldata_mem and appldata_os modules.
 732  * However, if this file is compiled as a module (for testing only), these
 733  * symbols are not exported. In this case, we define them locally and export
 734  * those.
 735  */
 736 void si_swapinfo(struct sysinfo *val)
 737 {
 738         val->freeswap = -1ul;
 739         val->totalswap = -1ul;
 740 }
 741
 742 unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
 743                                 -1 - FIXED_1/200};
 744 int nr_threads = -1;
 745
 746 void get_full_page_state(struct page_state *ps)
 747 {
 748         memset(ps, -1, sizeof(struct page_state));
 749 }
 750
 751 unsigned long nr_running(void)
 752 {
 753         return -1;
 754 }
 755
 756 unsigned long nr_iowait(void)
 757 {
 758         return -1;
 759 }
 760
 761 /*unsigned long nr_context_switches(void)
 762 {
 763         return -1;
 764 }*/
 765 #endif /* MODULE */
 766 EXPORT_SYMBOL_GPL(si_swapinfo);
 767 EXPORT_SYMBOL_GPL(nr_threads);
 768 EXPORT_SYMBOL_GPL(nr_running);
 769 EXPORT_SYMBOL_GPL(nr_iowait);
 770 //EXPORT_SYMBOL_GPL(nr_context_switches);