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 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   9  *
  10  * Author: Gerald Schaefer <geraldsc@de.ibm.com>
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/errno.h>
  18 #include <asm/uaccess.h>
  19 #include <asm/io.h>
  20 #include <asm/smp.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/page-flags.h>
  24 #include <linux/swap.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/sysctl.h>
  27 #include <asm/timer.h>
  28 //#include <linux/kernel_stat.h>
  29 #include <linux/notifier.h>
  30 #include <linux/cpu.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 #ifndef CONFIG_ARCH_S390X
  43
  44 #define APPLDATA_START_INTERVAL_REC 0x00        /* Function codes for */
  45 #define APPLDATA_STOP_REC           0x01        /* DIAG 0xDC      */
  46 #define APPLDATA_GEN_EVENT_RECORD   0x02
  47 #define APPLDATA_START_CONFIG_REC   0x03
  48
  49 #else
  50
  51 #define APPLDATA_START_INTERVAL_REC 0x80
  52 #define APPLDATA_STOP_REC           0x81
  53 #define APPLDATA_GEN_EVENT_RECORD   0x82
  54 #define APPLDATA_START_CONFIG_REC   0x83
  55
  56 #endif /* CONFIG_ARCH_S390X */
  57
  58
  59 /*
  60  * Parameter list for DIAGNOSE X'DC'
  61  */
  62 #ifndef CONFIG_ARCH_S390X
  63 struct appldata_parameter_list {
  64         u16 diag;               /* The DIAGNOSE code X'00DC'          */
  65         u8  function;           /* The function code for the DIAGNOSE */
  66         u8  parlist_length;     /* Length of the parameter list       */
  67         u32 product_id_addr;    /* Address of the 16-byte product ID  */
  68         u16 reserved;
  69         u16 buffer_length;      /* Length of the application data buffer  */
  70         u32 buffer_addr;        /* Address of the application data buffer */
  71 };
  72 #else
  73 struct appldata_parameter_list {
  74         u16 diag;
  75         u8  function;
  76         u8  parlist_length;
  77         u32 unused01;
  78         u16 reserved;
  79         u16 buffer_length;
  80         u32 unused02;
  81         u64 product_id_addr;
  82         u64 buffer_addr;
  83 };
  84 #endif /* CONFIG_ARCH_S390X */
  85
  86 /*
  87  * /proc entries (sysctl)
  88  */
  89 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
  90 static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
  91                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  92 static int appldata_interval_handler(ctl_table *ctl, int write,
  93                                          struct file *filp,
  94                                          void __user *buffer,
  95                                          size_t *lenp, loff_t *ppos);
  96
  97 static struct ctl_table_header *appldata_sysctl_header;
  98 static struct ctl_table appldata_table[] = {
  99         {
 100                 .ctl_name       = CTL_APPLDATA_TIMER,
 101                 .procname       = "timer",
 102                 .mode           = S_IRUGO | S_IWUSR,
 103                 .proc_handler   = &appldata_timer_handler,
 104         },
 105         {
 106                 .ctl_name       = CTL_APPLDATA_INTERVAL,
 107                 .procname       = "interval",
 108                 .mode           = S_IRUGO | S_IWUSR,
 109                 .proc_handler   = &appldata_interval_handler,
 110         },
 111         { .ctl_name = 0 }
 112 };
 113
 114 static struct ctl_table appldata_dir_table[] = {
 115         {
 116                 .ctl_name       = CTL_APPLDATA,
 117                 .procname       = appldata_proc_name,
 118                 .maxlen         = 0,
 119                 .mode           = S_IRUGO | S_IXUGO,
 120                 .child          = appldata_table,
 121         },
 122         { .ctl_name = 0 }
 123 };
 124
 125 /*
 126  * Timer
 127  */
 128 DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
 129 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
 130
 131 static DEFINE_SPINLOCK(appldata_timer_lock);
 132 static int appldata_interval = APPLDATA_CPU_INTERVAL;
 133 static int appldata_timer_active;
 134
 135 /*
 136  * Tasklet
 137  */
 138 static struct tasklet_struct appldata_tasklet_struct;
 139
 140 /*
 141  * Ops list
 142  */
 143 static DEFINE_SPINLOCK(appldata_ops_lock);
 144 static LIST_HEAD(appldata_ops_list);
 145
 146
 147 /************************* timer, tasklet, DIAG ******************************/
 148 /*
 149  * appldata_timer_function()
 150  *
 151  * schedule tasklet and reschedule timer
 152  */
 153 static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
 154 {
 155         P_DEBUG("   -= Timer =-\n");
 156         P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
 157                 atomic_read(&appldata_expire_count));
 158         if (atomic_dec_and_test(&appldata_expire_count)) {
 159                 atomic_set(&appldata_expire_count, num_online_cpus());
 160                 tasklet_schedule((struct tasklet_struct *) data);
 161         }
 162 }
 163
 164 /*
 165  * appldata_tasklet_function()
 166  *
 167  * call data gathering function for each (active) module
 168  */
 169 static void appldata_tasklet_function(unsigned long data)
 170 {
 171         struct list_head *lh;
 172         struct appldata_ops *ops;
 173         int i;
 174
 175         P_DEBUG("  -= Tasklet =-\n");
 176         i = 0;
 177         spin_lock(&appldata_ops_lock);
 178         list_for_each(lh, &appldata_ops_list) {
 179                 ops = list_entry(lh, struct appldata_ops, list);
 180                 P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
 181                         ++i, ops->active, ops->name);
 182                 if (ops->active == 1) {
 183                         ops->callback(ops->data);
 184                 }
 185         }
 186         spin_unlock(&appldata_ops_lock);
 187 }
 188
 189 /*
 190  * appldata_diag()
 191  *
 192  * prepare parameter list, issue DIAG 0xDC
 193  */
 194 static int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 195                         u16 length)
 196 {
 197         unsigned long ry;
 198         struct appldata_product_id {
 199                 char prod_nr[7];                        /* product nr. */
 200                 char prod_fn[2];                        /* product function */
 201                 char record_nr;                         /* record nr. */
 202                 char version_nr[2];                     /* version */
 203                 char release_nr[2];                     /* release */
 204                 char mod_lvl[2];                        /* modification lvl. */
 205         } appldata_product_id = {
 206         /* all strings are EBCDIC, record_nr is byte */
 207                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 208                                 0xE7, 0xD2, 0xD9},      /* "LINUXKR" */
 209                 .prod_fn    = {0xD5, 0xD3},             /* "NL" */
 210                 .record_nr  = record_nr,
 211                 .version_nr = {0xF2, 0xF6},             /* "26" */
 212                 .release_nr = {0xF0, 0xF1},             /* "01" */
 213                 .mod_lvl    = {0xF0, 0xF0},             /* "00" */
 214         };
 215         struct appldata_parameter_list appldata_parameter_list = {
 216                                 .diag = 0xDC,
 217                                 .function = function,
 218                                 .parlist_length =
 219                                         sizeof(appldata_parameter_list),
 220                                 .buffer_length = length,
 221                                 .product_id_addr =
 222                                         (unsigned long) &appldata_product_id,
 223                                 .buffer_addr = virt_to_phys((void *) buffer)
 224         };
 225
 226         if (!MACHINE_IS_VM)
 227                 return -ENOSYS;
 228         ry = -1;
 229         asm volatile(
 230                         "diag %1,%0,0xDC\n\t"
 231                         : "=d" (ry) : "d" (&(appldata_parameter_list)) : "cc");
 232         return (int) ry;
 233 }
 234 /********************** timer, tasklet, DIAG <END> ***************************/
 235
 236
 237 /****************************** /proc stuff **********************************/
 238
 239 /*
 240  * appldata_mod_vtimer_wrap()
 241  *
 242  * wrapper function for mod_virt_timer(), because smp_call_function_on()
 243  * accepts only one parameter.
 244  */
 245 static void __appldata_mod_vtimer_wrap(void *p) {
 246         struct {
 247                 struct vtimer_list *timer;
 248                 u64    expires;
 249         } *args = p;
 250         mod_virt_timer(args->timer, args->expires);
 251 }
 252
 253 #define APPLDATA_ADD_TIMER      0
 254 #define APPLDATA_DEL_TIMER      1
 255 #define APPLDATA_MOD_TIMER      2
 256
 257 /*
 258  * __appldata_vtimer_setup()
 259  *
 260  * Add, delete or modify virtual timers on all online cpus.
 261  * The caller needs to get the appldata_timer_lock spinlock.
 262  */
 263 static void
 264 __appldata_vtimer_setup(int cmd)
 265 {
 266         u64 per_cpu_interval;
 267         int i;
 268
 269         switch (cmd) {
 270         case APPLDATA_ADD_TIMER:
 271                 if (appldata_timer_active)
 272                         break;
 273                 per_cpu_interval = (u64) (appldata_interval*1000 /
 274                                           num_online_cpus()) * TOD_MICRO;
 275                 for_each_online_cpu(i) {
 276                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 277                         smp_call_function_on(add_virt_timer_periodic,
 278                                              &per_cpu(appldata_timer, i),
 279                                              0, 1, i);
 280                 }
 281                 appldata_timer_active = 1;
 282                 P_INFO("Monitoring timer started.\n");
 283                 break;
 284         case APPLDATA_DEL_TIMER:
 285                 for_each_online_cpu(i)
 286                         del_virt_timer(&per_cpu(appldata_timer, i));
 287                 if (!appldata_timer_active)
 288                         break;
 289                 appldata_timer_active = 0;
 290                 atomic_set(&appldata_expire_count, num_online_cpus());
 291                 P_INFO("Monitoring timer stopped.\n");
 292                 break;
 293         case APPLDATA_MOD_TIMER:
 294                 per_cpu_interval = (u64) (appldata_interval*1000 /
 295                                           num_online_cpus()) * TOD_MICRO;
 296                 if (!appldata_timer_active)
 297                         break;
 298                 for_each_online_cpu(i) {
 299                         struct {
 300                                 struct vtimer_list *timer;
 301                                 u64    expires;
 302                         } args;
 303                         args.timer = &per_cpu(appldata_timer, i);
 304                         args.expires = per_cpu_interval;
 305                         smp_call_function_on(__appldata_mod_vtimer_wrap,
 306                                              &args, 0, 1, i);
 307                 }
 308         }
 309 }
 310
 311 /*
 312  * appldata_timer_handler()
 313  *
 314  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 315  */
 316 static int
 317 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 318                            void __user *buffer, size_t *lenp, loff_t *ppos)
 319 {
 320         int len;
 321         char buf[2];
 322
 323         if (!*lenp || *ppos) {
 324                 *lenp = 0;
 325                 return 0;
 326         }
 327         if (!write) {
 328                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 329                 if (len > *lenp)
 330                         len = *lenp;
 331                 if (copy_to_user(buffer, buf, len))
 332                         return -EFAULT;
 333                 goto out;
 334         }
 335         len = *lenp;
 336         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 337                 return -EFAULT;
 338         spin_lock(&appldata_timer_lock);
 339         if (buf[0] == '1')
 340                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 341         else if (buf[0] == '0')
 342                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 343         spin_unlock(&appldata_timer_lock);
 344 out:
 345         *lenp = len;
 346         *ppos += len;
 347         return 0;
 348 }
 349
 350 /*
 351  * appldata_interval_handler()
 352  *
 353  * Set (CPU) timer interval for collection of data (in milliseconds), show
 354  * current timer interval.
 355  */
 356 static int
 357 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 358                            void __user *buffer, size_t *lenp, loff_t *ppos)
 359 {
 360         int len, interval;
 361         char buf[16];
 362
 363         if (!*lenp || *ppos) {
 364                 *lenp = 0;
 365                 return 0;
 366         }
 367         if (!write) {
 368                 len = sprintf(buf, "%i\n", appldata_interval);
 369                 if (len > *lenp)
 370                         len = *lenp;
 371                 if (copy_to_user(buffer, buf, len))
 372                         return -EFAULT;
 373                 goto out;
 374         }
 375         len = *lenp;
 376         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 377                 return -EFAULT;
 378         }
 379         sscanf(buf, "%i", &interval);
 380         if (interval <= 0) {
 381                 P_ERROR("Timer CPU interval has to be > 0!\n");
 382                 return -EINVAL;
 383         }
 384
 385         spin_lock(&appldata_timer_lock);
 386         appldata_interval = interval;
 387         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 388         spin_unlock(&appldata_timer_lock);
 389
 390         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 391                  interval);
 392 out:
 393         *lenp = len;
 394         *ppos += len;
 395         return 0;
 396 }
 397
 398 /*
 399  * appldata_generic_handler()
 400  *
 401  * Generic start/stop monitoring and DIAG, show status of
 402  * monitoring (0 = not in process, 1 = in process)
 403  */
 404 static int
 405 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 406                            void __user *buffer, size_t *lenp, loff_t *ppos)
 407 {
 408         struct appldata_ops *ops = NULL, *tmp_ops;
 409         int rc, len, found;
 410         char buf[2];
 411         struct list_head *lh;
 412
 413         found = 0;
 414         spin_lock_bh(&appldata_ops_lock);
 415         list_for_each(lh, &appldata_ops_list) {
 416                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 417                 if (&tmp_ops->ctl_table[2] == ctl) {
 418                         found = 1;
 419                 }
 420         }
 421         if (!found) {
 422                 spin_unlock_bh(&appldata_ops_lock);
 423                 return -ENODEV;
 424         }
 425         ops = ctl->data;
 426         if (!try_module_get(ops->owner)) {      // protect this function
 427                 spin_unlock_bh(&appldata_ops_lock);
 428                 return -ENODEV;
 429         }
 430         spin_unlock_bh(&appldata_ops_lock);
 431
 432         if (!*lenp || *ppos) {
 433                 *lenp = 0;
 434                 module_put(ops->owner);
 435                 return 0;
 436         }
 437         if (!write) {
 438                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 439                 if (len > *lenp)
 440                         len = *lenp;
 441                 if (copy_to_user(buffer, buf, len)) {
 442                         module_put(ops->owner);
 443                         return -EFAULT;
 444                 }
 445                 goto out;
 446         }
 447         len = *lenp;
 448         if (copy_from_user(buf, buffer,
 449                            len > sizeof(buf) ? sizeof(buf) : len)) {
 450                 module_put(ops->owner);
 451                 return -EFAULT;
 452         }
 453
 454         spin_lock_bh(&appldata_ops_lock);
 455         if ((buf[0] == '1') && (ops->active == 0)) {
 456                 if (!try_module_get(ops->owner)) {      // protect tasklet
 457                         spin_unlock_bh(&appldata_ops_lock);
 458                         module_put(ops->owner);
 459                         return -ENODEV;
 460                 }
 461                 ops->active = 1;
 462                 ops->callback(ops->data);       // init record
 463                 rc = appldata_diag(ops->record_nr,
 464                                         APPLDATA_START_INTERVAL_REC,
 465                                         (unsigned long) ops->data, ops->size);
 466                 if (rc != 0) {
 467                         P_ERROR("START DIAG 0xDC for %s failed, "
 468                                 "return code: %d\n", ops->name, rc);
 469                         module_put(ops->owner);
 470                         ops->active = 0;
 471                 } else {
 472                         P_INFO("Monitoring %s data enabled, "
 473                                 "DIAG 0xDC started.\n", ops->name);
 474                 }
 475         } else if ((buf[0] == '0') && (ops->active == 1)) {
 476                 ops->active = 0;
 477                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 478                                 (unsigned long) ops->data, ops->size);
 479                 if (rc != 0) {
 480                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 481                                 "return code: %d\n", ops->name, rc);
 482                 } else {
 483                         P_INFO("Monitoring %s data disabled, "
 484                                 "DIAG 0xDC stopped.\n", ops->name);
 485                 }
 486                 module_put(ops->owner);
 487         }
 488         spin_unlock_bh(&appldata_ops_lock);
 489 out:
 490         *lenp = len;
 491         *ppos += len;
 492         module_put(ops->owner);
 493         return 0;
 494 }
 495
 496 /*************************** /proc stuff <END> *******************************/
 497
 498
 499 /************************* module-ops management *****************************/
 500 /*
 501  * appldata_register_ops()
 502  *
 503  * update ops list, register /proc/sys entries
 504  */
 505 int appldata_register_ops(struct appldata_ops *ops)
 506 {
 507         struct list_head *lh;
 508         struct appldata_ops *tmp_ops;
 509         int i;
 510
 511         i = 0;
 512
 513         if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
 514                 (ops->size < 0)){
 515                 P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
 516                         ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
 517                 return -ENOMEM;
 518         }
 519         if ((ops->ctl_nr == CTL_APPLDATA) ||
 520             (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
 521             (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
 522                 P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
 523                 return -EBUSY;
 524         }
 525         ops->ctl_table = kmalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
 526         if (ops->ctl_table == NULL) {
 527                 P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
 528                 return -ENOMEM;
 529         }
 530         memset(ops->ctl_table, 0, 4*sizeof(struct ctl_table));
 531
 532         spin_lock_bh(&appldata_ops_lock);
 533         list_for_each(lh, &appldata_ops_list) {
 534                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 535                 P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
 536                         ++i, tmp_ops->name, tmp_ops->ctl_nr);
 537                 P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
 538                         tmp_ops->name, tmp_ops->ctl_nr, ops->name,
 539                         ops->ctl_nr);
 540                 if (strncmp(tmp_ops->name, ops->name,
 541                                 APPLDATA_PROC_NAME_LENGTH) == 0) {
 542                         P_ERROR("Name \"%s\" already registered!\n", ops->name);
 543                         kfree(ops->ctl_table);
 544                         spin_unlock_bh(&appldata_ops_lock);
 545                         return -EBUSY;
 546                 }
 547                 if (tmp_ops->ctl_nr == ops->ctl_nr) {
 548                         P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
 549                         kfree(ops->ctl_table);
 550                         spin_unlock_bh(&appldata_ops_lock);
 551                         return -EBUSY;
 552                 }
 553         }
 554         list_add(&ops->list, &appldata_ops_list);
 555         spin_unlock_bh(&appldata_ops_lock);
 556
 557         ops->ctl_table[0].ctl_name = CTL_APPLDATA;
 558         ops->ctl_table[0].procname = appldata_proc_name;
 559         ops->ctl_table[0].maxlen   = 0;
 560         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 561         ops->ctl_table[0].child    = &ops->ctl_table[2];
 562
 563         ops->ctl_table[1].ctl_name = 0;
 564
 565         ops->ctl_table[2].ctl_name = ops->ctl_nr;
 566         ops->ctl_table[2].procname = ops->name;
 567         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 568         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 569         ops->ctl_table[2].data = ops;
 570
 571         ops->ctl_table[3].ctl_name = 0;
 572
 573         ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
 574
 575         P_INFO("%s-ops registered!\n", ops->name);
 576         return 0;
 577 }
 578
 579 /*
 580  * appldata_unregister_ops()
 581  *
 582  * update ops list, unregister /proc entries, stop DIAG if necessary
 583  */
 584 void appldata_unregister_ops(struct appldata_ops *ops)
 585 {
 586         spin_lock_bh(&appldata_ops_lock);
 587         unregister_sysctl_table(ops->sysctl_header);
 588         list_del(&ops->list);
 589         kfree(ops->ctl_table);
 590         ops->ctl_table = NULL;
 591         spin_unlock_bh(&appldata_ops_lock);
 592         P_INFO("%s-ops unregistered!\n", ops->name);
 593 }
 594 /********************** module-ops management <END> **************************/
 595
 596
 597 /******************************* init / exit *********************************/
 598
 599 static void
 600 appldata_online_cpu(int cpu)
 601 {
 602         init_virt_timer(&per_cpu(appldata_timer, cpu));
 603         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 604         per_cpu(appldata_timer, cpu).data = (unsigned long)
 605                 &appldata_tasklet_struct;
 606         atomic_inc(&appldata_expire_count);
 607         spin_lock(&appldata_timer_lock);
 608         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 609         spin_unlock(&appldata_timer_lock);
 610 }
 611
 612 static void
 613 appldata_offline_cpu(int cpu)
 614 {
 615         del_virt_timer(&per_cpu(appldata_timer, cpu));
 616         if (atomic_dec_and_test(&appldata_expire_count)) {
 617                 atomic_set(&appldata_expire_count, num_online_cpus());
 618                 tasklet_schedule(&appldata_tasklet_struct);
 619         }
 620         spin_lock(&appldata_timer_lock);
 621         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 622         spin_unlock(&appldata_timer_lock);
 623 }
 624
 625 static int
 626 appldata_cpu_notify(struct notifier_block *self,
 627                     unsigned long action, void *hcpu)
 628 {
 629         switch (action) {
 630         case CPU_ONLINE:
 631                 appldata_online_cpu((long) hcpu);
 632                 break;
 633 #ifdef CONFIG_HOTPLUG_CPU
 634         case CPU_DEAD:
 635                 appldata_offline_cpu((long) hcpu);
 636                 break;
 637 #endif
 638         default:
 639                 break;
 640         }
 641         return NOTIFY_OK;
 642 }
 643
 644 static struct notifier_block __devinitdata appldata_nb = {
 645         .notifier_call = appldata_cpu_notify,
 646 };
 647
 648 /*
 649  * appldata_init()
 650  *
 651  * init timer and tasklet, register /proc entries
 652  */
 653 static int __init appldata_init(void)
 654 {
 655         int i;
 656
 657         P_DEBUG("sizeof(parameter_list) = %lu\n",
 658                 sizeof(struct appldata_parameter_list));
 659
 660         for_each_online_cpu(i)
 661                 appldata_online_cpu(i);
 662
 663         /* Register cpu hotplug notifier */
 664         register_cpu_notifier(&appldata_nb);
 665
 666         appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
 667 #ifdef MODULE
 668         appldata_dir_table[0].de->owner = THIS_MODULE;
 669         appldata_table[0].de->owner = THIS_MODULE;
 670         appldata_table[1].de->owner = THIS_MODULE;
 671 #endif
 672
 673         tasklet_init(&appldata_tasklet_struct, appldata_tasklet_function, 0);
 674         P_DEBUG("Base interface initialized.\n");
 675         return 0;
 676 }
 677
 678 /*
 679  * appldata_exit()
 680  *
 681  * stop timer and tasklet, 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_bh(&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                 if (rc != 0) {
 699                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 700                                 "return code: %d\n", ops->name, rc);
 701                 }
 702         }
 703         spin_unlock_bh(&appldata_ops_lock);
 704
 705         for_each_online_cpu(i)
 706                 appldata_offline_cpu(i);
 707
 708         appldata_timer_active = 0;
 709
 710         unregister_sysctl_table(appldata_sysctl_header);
 711
 712         tasklet_kill(&appldata_tasklet_struct);
 713         P_DEBUG("... module unloaded!\n");
 714 }
 715 /**************************** init / exit <END> ******************************/
 716
 717
 718 module_init(appldata_init);
 719 module_exit(appldata_exit);
 720 MODULE_LICENSE("GPL");
 721 MODULE_AUTHOR("Gerald Schaefer");
 722 MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
 723
 724 EXPORT_SYMBOL_GPL(appldata_register_ops);
 725 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 726
 727 #ifdef MODULE
 728 /*
 729  * Kernel symbols needed by appldata_mem and appldata_os modules.
 730  * However, if this file is compiled as a module (for testing only), these
 731  * symbols are not exported. In this case, we define them locally and export
 732  * those.
 733  */
 734 void si_swapinfo(struct sysinfo *val)
 735 {
 736         val->freeswap = -1ul;
 737         val->totalswap = -1ul;
 738 }
 739
 740 unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
 741                                 -1 - FIXED_1/200};
 742 int nr_threads = -1;
 743
 744 void get_full_page_state(struct page_state *ps)
 745 {
 746         memset(ps, -1, sizeof(struct page_state));
 747 }
 748
 749 unsigned long nr_running(void)
 750 {
 751         return -1;
 752 }
 753
 754 unsigned long nr_iowait(void)
 755 {
 756         return -1;
 757 }
 758
 759 /*unsigned long nr_context_switches(void)
 760 {
 761         return -1;
 762 }*/
 763 #endif /* MODULE */
 764 EXPORT_SYMBOL_GPL(si_swapinfo);
 765 EXPORT_SYMBOL_GPL(nr_threads);
 766 EXPORT_SYMBOL_GPL(avenrun);
 767 EXPORT_SYMBOL_GPL(get_full_page_state);
 768 EXPORT_SYMBOL_GPL(nr_running);
 769 EXPORT_SYMBOL_GPL(nr_iowait);
 770 //EXPORT_SYMBOL_GPL(nr_context_switches);