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 #include <linux/workqueue.h>
  32
  33 #include "appldata.h"
  34
  35
  36 #define MY_PRINT_NAME   "appldata"              /* for debug messages, etc. */
  37 #define APPLDATA_CPU_INTERVAL   10000           /* default (CPU) time for
  38                                                    sampling interval in
  39                                                    milliseconds */
  40
  41 #define TOD_MICRO       0x01000                 /* nr. of TOD clock units
  42                                                    for 1 microsecond */
  43 #ifndef CONFIG_ARCH_S390X
  44
  45 #define APPLDATA_START_INTERVAL_REC 0x00        /* Function codes for */
  46 #define APPLDATA_STOP_REC           0x01        /* DIAG 0xDC      */
  47 #define APPLDATA_GEN_EVENT_RECORD   0x02
  48 #define APPLDATA_START_CONFIG_REC   0x03
  49
  50 #else
  51
  52 #define APPLDATA_START_INTERVAL_REC 0x80
  53 #define APPLDATA_STOP_REC           0x81
  54 #define APPLDATA_GEN_EVENT_RECORD   0x82
  55 #define APPLDATA_START_CONFIG_REC   0x83
  56
  57 #endif /* CONFIG_ARCH_S390X */
  58
  59
  60 /*
  61  * Parameter list for DIAGNOSE X'DC'
  62  */
  63 #ifndef CONFIG_ARCH_S390X
  64 struct appldata_parameter_list {
  65         u16 diag;               /* The DIAGNOSE code X'00DC'          */
  66         u8  function;           /* The function code for the DIAGNOSE */
  67         u8  parlist_length;     /* Length of the parameter list       */
  68         u32 product_id_addr;    /* Address of the 16-byte product ID  */
  69         u16 reserved;
  70         u16 buffer_length;      /* Length of the application data buffer  */
  71         u32 buffer_addr;        /* Address of the application data buffer */
  72 };
  73 #else
  74 struct appldata_parameter_list {
  75         u16 diag;
  76         u8  function;
  77         u8  parlist_length;
  78         u32 unused01;
  79         u16 reserved;
  80         u16 buffer_length;
  81         u32 unused02;
  82         u64 product_id_addr;
  83         u64 buffer_addr;
  84 };
  85 #endif /* CONFIG_ARCH_S390X */
  86
  87 /*
  88  * /proc entries (sysctl)
  89  */
  90 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
  91 static int appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
  92                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  93 static int appldata_interval_handler(ctl_table *ctl, int write,
  94                                          struct file *filp,
  95                                          void __user *buffer,
  96                                          size_t *lenp, loff_t *ppos);
  97
  98 static struct ctl_table_header *appldata_sysctl_header;
  99 static struct ctl_table appldata_table[] = {
 100         {
 101                 .ctl_name       = CTL_APPLDATA_TIMER,
 102                 .procname       = "timer",
 103                 .mode           = S_IRUGO | S_IWUSR,
 104                 .proc_handler   = &appldata_timer_handler,
 105         },
 106         {
 107                 .ctl_name       = CTL_APPLDATA_INTERVAL,
 108                 .procname       = "interval",
 109                 .mode           = S_IRUGO | S_IWUSR,
 110                 .proc_handler   = &appldata_interval_handler,
 111         },
 112         { .ctl_name = 0 }
 113 };
 114
 115 static struct ctl_table appldata_dir_table[] = {
 116         {
 117                 .ctl_name       = CTL_APPLDATA,
 118                 .procname       = appldata_proc_name,
 119                 .maxlen         = 0,
 120                 .mode           = S_IRUGO | S_IXUGO,
 121                 .child          = appldata_table,
 122         },
 123         { .ctl_name = 0 }
 124 };
 125
 126 /*
 127  * Timer
 128  */
 129 DEFINE_PER_CPU(struct vtimer_list, appldata_timer);
 130 static atomic_t appldata_expire_count = ATOMIC_INIT(0);
 131
 132 static DEFINE_SPINLOCK(appldata_timer_lock);
 133 static int appldata_interval = APPLDATA_CPU_INTERVAL;
 134 static int appldata_timer_active;
 135
 136 /*
 137  * Work queue
 138  */
 139 static struct workqueue_struct *appldata_wq;
 140 static void appldata_work_fn(void *data);
 141 static DECLARE_WORK(appldata_work, appldata_work_fn, NULL);
 142
 143
 144 /*
 145  * Ops list
 146  */
 147 static DEFINE_SPINLOCK(appldata_ops_lock);
 148 static LIST_HEAD(appldata_ops_list);
 149
 150
 151 /*************************** timer, work, DIAG *******************************/
 152 /*
 153  * appldata_timer_function()
 154  *
 155  * schedule work and reschedule timer
 156  */
 157 static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
 158 {
 159         P_DEBUG("   -= Timer =-\n");
 160         P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),
 161                 atomic_read(&appldata_expire_count));
 162         if (atomic_dec_and_test(&appldata_expire_count)) {
 163                 atomic_set(&appldata_expire_count, num_online_cpus());
 164                 queue_work(appldata_wq, (struct work_struct *) data);
 165         }
 166 }
 167
 168 /*
 169  * appldata_work_fn()
 170  *
 171  * call data gathering function for each (active) module
 172  */
 173 static void appldata_work_fn(void *data)
 174 {
 175         struct list_head *lh;
 176         struct appldata_ops *ops;
 177         int i;
 178
 179         P_DEBUG("  -= Work Queue =-\n");
 180         i = 0;
 181         spin_lock(&appldata_ops_lock);
 182         list_for_each(lh, &appldata_ops_list) {
 183                 ops = list_entry(lh, struct appldata_ops, list);
 184                 P_DEBUG("list_for_each loop: %i) active = %u, name = %s\n",
 185                         ++i, ops->active, ops->name);
 186                 if (ops->active == 1) {
 187                         ops->callback(ops->data);
 188                 }
 189         }
 190         spin_unlock(&appldata_ops_lock);
 191 }
 192
 193 /*
 194  * appldata_diag()
 195  *
 196  * prepare parameter list, issue DIAG 0xDC
 197  */
 198 static int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 199                         u16 length)
 200 {
 201         unsigned long ry;
 202         struct appldata_product_id {
 203                 char prod_nr[7];                        /* product nr. */
 204                 char prod_fn[2];                        /* product function */
 205                 char record_nr;                         /* record nr. */
 206                 char version_nr[2];                     /* version */
 207                 char release_nr[2];                     /* release */
 208                 char mod_lvl[2];                        /* modification lvl. */
 209         } appldata_product_id = {
 210         /* all strings are EBCDIC, record_nr is byte */
 211                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 212                                 0xE7, 0xD2, 0xD9},      /* "LINUXKR" */
 213                 .prod_fn    = {0xD5, 0xD3},             /* "NL" */
 214                 .record_nr  = record_nr,
 215                 .version_nr = {0xF2, 0xF6},             /* "26" */
 216                 .release_nr = {0xF0, 0xF1},             /* "01" */
 217                 .mod_lvl    = {0xF0, 0xF0},             /* "00" */
 218         };
 219         struct appldata_parameter_list appldata_parameter_list = {
 220                                 .diag = 0xDC,
 221                                 .function = function,
 222                                 .parlist_length =
 223                                         sizeof(appldata_parameter_list),
 224                                 .buffer_length = length,
 225                                 .product_id_addr =
 226                                         (unsigned long) &appldata_product_id,
 227                                 .buffer_addr = virt_to_phys((void *) buffer)
 228         };
 229
 230         if (!MACHINE_IS_VM)
 231                 return -ENOSYS;
 232         ry = -1;
 233         asm volatile(
 234                         "diag %1,%0,0xDC\n\t"
 235                         : "=d" (ry) : "d" (&(appldata_parameter_list)) : "cc");
 236         return (int) ry;
 237 }
 238 /************************ timer, work, DIAG <END> ****************************/
 239
 240
 241 /****************************** /proc stuff **********************************/
 242
 243 /*
 244  * appldata_mod_vtimer_wrap()
 245  *
 246  * wrapper function for mod_virt_timer(), because smp_call_function_on()
 247  * accepts only one parameter.
 248  */
 249 static void __appldata_mod_vtimer_wrap(void *p) {
 250         struct {
 251                 struct vtimer_list *timer;
 252                 u64    expires;
 253         } *args = p;
 254         mod_virt_timer(args->timer, args->expires);
 255 }
 256
 257 #define APPLDATA_ADD_TIMER      0
 258 #define APPLDATA_DEL_TIMER      1
 259 #define APPLDATA_MOD_TIMER      2
 260
 261 /*
 262  * __appldata_vtimer_setup()
 263  *
 264  * Add, delete or modify virtual timers on all online cpus.
 265  * The caller needs to get the appldata_timer_lock spinlock.
 266  */
 267 static void
 268 __appldata_vtimer_setup(int cmd)
 269 {
 270         u64 per_cpu_interval;
 271         int i;
 272
 273         switch (cmd) {
 274         case APPLDATA_ADD_TIMER:
 275                 if (appldata_timer_active)
 276                         break;
 277                 per_cpu_interval = (u64) (appldata_interval*1000 /
 278                                           num_online_cpus()) * TOD_MICRO;
 279                 for_each_online_cpu(i) {
 280                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 281                         smp_call_function_on(add_virt_timer_periodic,
 282                                              &per_cpu(appldata_timer, i),
 283                                              0, 1, i);
 284                 }
 285                 appldata_timer_active = 1;
 286                 P_INFO("Monitoring timer started.\n");
 287                 break;
 288         case APPLDATA_DEL_TIMER:
 289                 for_each_online_cpu(i)
 290                         del_virt_timer(&per_cpu(appldata_timer, i));
 291                 if (!appldata_timer_active)
 292                         break;
 293                 appldata_timer_active = 0;
 294                 atomic_set(&appldata_expire_count, num_online_cpus());
 295                 P_INFO("Monitoring timer stopped.\n");
 296                 break;
 297         case APPLDATA_MOD_TIMER:
 298                 per_cpu_interval = (u64) (appldata_interval*1000 /
 299                                           num_online_cpus()) * TOD_MICRO;
 300                 if (!appldata_timer_active)
 301                         break;
 302                 for_each_online_cpu(i) {
 303                         struct {
 304                                 struct vtimer_list *timer;
 305                                 u64    expires;
 306                         } args;
 307                         args.timer = &per_cpu(appldata_timer, i);
 308                         args.expires = per_cpu_interval;
 309                         smp_call_function_on(__appldata_mod_vtimer_wrap,
 310                                              &args, 0, 1, i);
 311                 }
 312         }
 313 }
 314
 315 /*
 316  * appldata_timer_handler()
 317  *
 318  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 319  */
 320 static int
 321 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 322                            void __user *buffer, size_t *lenp, loff_t *ppos)
 323 {
 324         int len;
 325         char buf[2];
 326
 327         if (!*lenp || *ppos) {
 328                 *lenp = 0;
 329                 return 0;
 330         }
 331         if (!write) {
 332                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 333                 if (len > *lenp)
 334                         len = *lenp;
 335                 if (copy_to_user(buffer, buf, len))
 336                         return -EFAULT;
 337                 goto out;
 338         }
 339         len = *lenp;
 340         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 341                 return -EFAULT;
 342         spin_lock(&appldata_timer_lock);
 343         if (buf[0] == '1')
 344                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 345         else if (buf[0] == '0')
 346                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 347         spin_unlock(&appldata_timer_lock);
 348 out:
 349         *lenp = len;
 350         *ppos += len;
 351         return 0;
 352 }
 353
 354 /*
 355  * appldata_interval_handler()
 356  *
 357  * Set (CPU) timer interval for collection of data (in milliseconds), show
 358  * current timer interval.
 359  */
 360 static int
 361 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 362                            void __user *buffer, size_t *lenp, loff_t *ppos)
 363 {
 364         int len, interval;
 365         char buf[16];
 366
 367         if (!*lenp || *ppos) {
 368                 *lenp = 0;
 369                 return 0;
 370         }
 371         if (!write) {
 372                 len = sprintf(buf, "%i\n", appldata_interval);
 373                 if (len > *lenp)
 374                         len = *lenp;
 375                 if (copy_to_user(buffer, buf, len))
 376                         return -EFAULT;
 377                 goto out;
 378         }
 379         len = *lenp;
 380         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 381                 return -EFAULT;
 382         }
 383         sscanf(buf, "%i", &interval);
 384         if (interval <= 0) {
 385                 P_ERROR("Timer CPU interval has to be > 0!\n");
 386                 return -EINVAL;
 387         }
 388
 389         spin_lock(&appldata_timer_lock);
 390         appldata_interval = interval;
 391         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 392         spin_unlock(&appldata_timer_lock);
 393
 394         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 395                  interval);
 396 out:
 397         *lenp = len;
 398         *ppos += len;
 399         return 0;
 400 }
 401
 402 /*
 403  * appldata_generic_handler()
 404  *
 405  * Generic start/stop monitoring and DIAG, show status of
 406  * monitoring (0 = not in process, 1 = in process)
 407  */
 408 static int
 409 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 410                            void __user *buffer, size_t *lenp, loff_t *ppos)
 411 {
 412         struct appldata_ops *ops = NULL, *tmp_ops;
 413         int rc, len, found;
 414         char buf[2];
 415         struct list_head *lh;
 416
 417         found = 0;
 418         spin_lock(&appldata_ops_lock);
 419         list_for_each(lh, &appldata_ops_list) {
 420                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 421                 if (&tmp_ops->ctl_table[2] == ctl) {
 422                         found = 1;
 423                 }
 424         }
 425         if (!found) {
 426                 spin_unlock(&appldata_ops_lock);
 427                 return -ENODEV;
 428         }
 429         ops = ctl->data;
 430         if (!try_module_get(ops->owner)) {      // protect this function
 431                 spin_unlock(&appldata_ops_lock);
 432                 return -ENODEV;
 433         }
 434         spin_unlock(&appldata_ops_lock);
 435
 436         if (!*lenp || *ppos) {
 437                 *lenp = 0;
 438                 module_put(ops->owner);
 439                 return 0;
 440         }
 441         if (!write) {
 442                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 443                 if (len > *lenp)
 444                         len = *lenp;
 445                 if (copy_to_user(buffer, buf, len)) {
 446                         module_put(ops->owner);
 447                         return -EFAULT;
 448                 }
 449                 goto out;
 450         }
 451         len = *lenp;
 452         if (copy_from_user(buf, buffer,
 453                            len > sizeof(buf) ? sizeof(buf) : len)) {
 454                 module_put(ops->owner);
 455                 return -EFAULT;
 456         }
 457
 458         spin_lock(&appldata_ops_lock);
 459         if ((buf[0] == '1') && (ops->active == 0)) {
 460                 // protect work queue callback
 461                 if (!try_module_get(ops->owner)) {
 462                         spin_unlock(&appldata_ops_lock);
 463                         module_put(ops->owner);
 464                         return -ENODEV;
 465                 }
 466                 ops->active = 1;
 467                 ops->callback(ops->data);       // init record
 468                 rc = appldata_diag(ops->record_nr,
 469                                         APPLDATA_START_INTERVAL_REC,
 470                                         (unsigned long) ops->data, ops->size);
 471                 if (rc != 0) {
 472                         P_ERROR("START DIAG 0xDC for %s failed, "
 473                                 "return code: %d\n", ops->name, rc);
 474                         module_put(ops->owner);
 475                         ops->active = 0;
 476                 } else {
 477                         P_INFO("Monitoring %s data enabled, "
 478                                 "DIAG 0xDC started.\n", ops->name);
 479                 }
 480         } else if ((buf[0] == '0') && (ops->active == 1)) {
 481                 ops->active = 0;
 482                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 483                                 (unsigned long) ops->data, ops->size);
 484                 if (rc != 0) {
 485                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 486                                 "return code: %d\n", ops->name, rc);
 487                 } else {
 488                         P_INFO("Monitoring %s data disabled, "
 489                                 "DIAG 0xDC stopped.\n", ops->name);
 490                 }
 491                 module_put(ops->owner);
 492         }
 493         spin_unlock(&appldata_ops_lock);
 494 out:
 495         *lenp = len;
 496         *ppos += len;
 497         module_put(ops->owner);
 498         return 0;
 499 }
 500
 501 /*************************** /proc stuff <END> *******************************/
 502
 503
 504 /************************* module-ops management *****************************/
 505 /*
 506  * appldata_register_ops()
 507  *
 508  * update ops list, register /proc/sys entries
 509  */
 510 int appldata_register_ops(struct appldata_ops *ops)
 511 {
 512         struct list_head *lh;
 513         struct appldata_ops *tmp_ops;
 514         int i;
 515
 516         i = 0;
 517
 518         if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
 519                 (ops->size < 0)){
 520                 P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
 521                         ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
 522                 return -ENOMEM;
 523         }
 524         if ((ops->ctl_nr == CTL_APPLDATA) ||
 525             (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
 526             (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
 527                 P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
 528                 return -EBUSY;
 529         }
 530         ops->ctl_table = kmalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
 531         if (ops->ctl_table == NULL) {
 532                 P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
 533                 return -ENOMEM;
 534         }
 535         memset(ops->ctl_table, 0, 4*sizeof(struct ctl_table));
 536
 537         spin_lock(&appldata_ops_lock);
 538         list_for_each(lh, &appldata_ops_list) {
 539                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 540                 P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
 541                         ++i, tmp_ops->name, tmp_ops->ctl_nr);
 542                 P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
 543                         tmp_ops->name, tmp_ops->ctl_nr, ops->name,
 544                         ops->ctl_nr);
 545                 if (strncmp(tmp_ops->name, ops->name,
 546                                 APPLDATA_PROC_NAME_LENGTH) == 0) {
 547                         P_ERROR("Name \"%s\" already registered!\n", ops->name);
 548                         kfree(ops->ctl_table);
 549                         spin_unlock(&appldata_ops_lock);
 550                         return -EBUSY;
 551                 }
 552                 if (tmp_ops->ctl_nr == ops->ctl_nr) {
 553                         P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
 554                         kfree(ops->ctl_table);
 555                         spin_unlock(&appldata_ops_lock);
 556                         return -EBUSY;
 557                 }
 558         }
 559         list_add(&ops->list, &appldata_ops_list);
 560         spin_unlock(&appldata_ops_lock);
 561
 562         ops->ctl_table[0].ctl_name = CTL_APPLDATA;
 563         ops->ctl_table[0].procname = appldata_proc_name;
 564         ops->ctl_table[0].maxlen   = 0;
 565         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 566         ops->ctl_table[0].child    = &ops->ctl_table[2];
 567
 568         ops->ctl_table[1].ctl_name = 0;
 569
 570         ops->ctl_table[2].ctl_name = ops->ctl_nr;
 571         ops->ctl_table[2].procname = ops->name;
 572         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 573         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 574         ops->ctl_table[2].data = ops;
 575
 576         ops->ctl_table[3].ctl_name = 0;
 577
 578         ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
 579
 580         P_INFO("%s-ops registered!\n", ops->name);
 581         return 0;
 582 }
 583
 584 /*
 585  * appldata_unregister_ops()
 586  *
 587  * update ops list, unregister /proc entries, stop DIAG if necessary
 588  */
 589 void appldata_unregister_ops(struct appldata_ops *ops)
 590 {
 591         spin_lock(&appldata_ops_lock);
 592         unregister_sysctl_table(ops->sysctl_header);
 593         list_del(&ops->list);
 594         kfree(ops->ctl_table);
 595         ops->ctl_table = NULL;
 596         spin_unlock(&appldata_ops_lock);
 597         P_INFO("%s-ops unregistered!\n", ops->name);
 598 }
 599 /********************** module-ops management <END> **************************/
 600
 601
 602 /******************************* init / exit *********************************/
 603
 604 static void
 605 appldata_online_cpu(int cpu)
 606 {
 607         init_virt_timer(&per_cpu(appldata_timer, cpu));
 608         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 609         per_cpu(appldata_timer, cpu).data = (unsigned long)
 610                 &appldata_work;
 611         atomic_inc(&appldata_expire_count);
 612         spin_lock(&appldata_timer_lock);
 613         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 614         spin_unlock(&appldata_timer_lock);
 615 }
 616
 617 static void
 618 appldata_offline_cpu(int cpu)
 619 {
 620         del_virt_timer(&per_cpu(appldata_timer, cpu));
 621         if (atomic_dec_and_test(&appldata_expire_count)) {
 622                 atomic_set(&appldata_expire_count, num_online_cpus());
 623                 queue_work(appldata_wq, &appldata_work);
 624         }
 625         spin_lock(&appldata_timer_lock);
 626         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 627         spin_unlock(&appldata_timer_lock);
 628 }
 629
 630 static int
 631 appldata_cpu_notify(struct notifier_block *self,
 632                     unsigned long action, void *hcpu)
 633 {
 634         switch (action) {
 635         case CPU_ONLINE:
 636                 appldata_online_cpu((long) hcpu);
 637                 break;
 638 #ifdef CONFIG_HOTPLUG_CPU
 639         case CPU_DEAD:
 640                 appldata_offline_cpu((long) hcpu);
 641                 break;
 642 #endif
 643         default:
 644                 break;
 645         }
 646         return NOTIFY_OK;
 647 }
 648
 649 static struct notifier_block __devinitdata appldata_nb = {
 650         .notifier_call = appldata_cpu_notify,
 651 };
 652
 653 /*
 654  * appldata_init()
 655  *
 656  * init timer, register /proc entries
 657  */
 658 static int __init appldata_init(void)
 659 {
 660         int i;
 661
 662         P_DEBUG("sizeof(parameter_list) = %lu\n",
 663                 sizeof(struct appldata_parameter_list));
 664
 665         appldata_wq = create_singlethread_workqueue("appldata");
 666         if (!appldata_wq) {
 667                 P_ERROR("Could not create work queue\n");
 668                 return -ENOMEM;
 669         }
 670
 671         for_each_online_cpu(i)
 672                 appldata_online_cpu(i);
 673
 674         /* Register cpu hotplug notifier */
 675         register_cpu_notifier(&appldata_nb);
 676
 677         appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
 678 #ifdef MODULE
 679         appldata_dir_table[0].de->owner = THIS_MODULE;
 680         appldata_table[0].de->owner = THIS_MODULE;
 681         appldata_table[1].de->owner = THIS_MODULE;
 682 #endif
 683
 684         P_DEBUG("Base interface initialized.\n");
 685         return 0;
 686 }
 687
 688 /*
 689  * appldata_exit()
 690  *
 691  * stop timer, unregister /proc entries
 692  */
 693 static void __exit appldata_exit(void)
 694 {
 695         struct list_head *lh;
 696         struct appldata_ops *ops;
 697         int rc, i;
 698
 699         P_DEBUG("Unloading module ...\n");
 700         /*
 701          * ops list should be empty, but just in case something went wrong...
 702          */
 703         spin_lock(&appldata_ops_lock);
 704         list_for_each(lh, &appldata_ops_list) {
 705                 ops = list_entry(lh, struct appldata_ops, list);
 706                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 707                                 (unsigned long) ops->data, ops->size);
 708                 if (rc != 0) {
 709                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 710                                 "return code: %d\n", ops->name, rc);
 711                 }
 712         }
 713         spin_unlock(&appldata_ops_lock);
 714
 715         for_each_online_cpu(i)
 716                 appldata_offline_cpu(i);
 717
 718         appldata_timer_active = 0;
 719
 720         unregister_sysctl_table(appldata_sysctl_header);
 721
 722         destroy_workqueue(appldata_wq);
 723         P_DEBUG("... module unloaded!\n");
 724 }
 725 /**************************** init / exit <END> ******************************/
 726
 727
 728 module_init(appldata_init);
 729 module_exit(appldata_exit);
 730 MODULE_LICENSE("GPL");
 731 MODULE_AUTHOR("Gerald Schaefer");
 732 MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
 733
 734 EXPORT_SYMBOL_GPL(appldata_register_ops);
 735 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 736
 737 #ifdef MODULE
 738 /*
 739  * Kernel symbols needed by appldata_mem and appldata_os modules.
 740  * However, if this file is compiled as a module (for testing only), these
 741  * symbols are not exported. In this case, we define them locally and export
 742  * those.
 743  */
 744 void si_swapinfo(struct sysinfo *val)
 745 {
 746         val->freeswap = -1ul;
 747         val->totalswap = -1ul;
 748 }
 749
 750 unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
 751                                 -1 - FIXED_1/200};
 752 int nr_threads = -1;
 753
 754 void get_full_page_state(struct page_state *ps)
 755 {
 756         memset(ps, -1, sizeof(struct page_state));
 757 }
 758
 759 unsigned long nr_running(void)
 760 {
 761         return -1;
 762 }
 763
 764 unsigned long nr_iowait(void)
 765 {
 766         return -1;
 767 }
 768
 769 /*unsigned long nr_context_switches(void)
 770 {
 771         return -1;
 772 }*/
 773 #endif /* MODULE */
 774 EXPORT_SYMBOL_GPL(si_swapinfo);
 775 EXPORT_SYMBOL_GPL(nr_threads);
 776 EXPORT_SYMBOL_GPL(avenrun);
 777 EXPORT_SYMBOL_GPL(get_full_page_state);
 778 EXPORT_SYMBOL_GPL(nr_running);
 779 EXPORT_SYMBOL_GPL(nr_iowait);
 780 //EXPORT_SYMBOL_GPL(nr_context_switches);