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)
 236                         : "d" (&appldata_parameter_list),
 237                           "m" (appldata_parameter_list),
 238                           "m" (appldata_product_id)
 239                         : "cc");
 240         return (int) ry;
 241 }
 242 /************************ timer, work, DIAG <END> ****************************/
 243
 244
 245 /****************************** /proc stuff **********************************/
 246
 247 /*
 248  * appldata_mod_vtimer_wrap()
 249  *
 250  * wrapper function for mod_virt_timer(), because smp_call_function_on()
 251  * accepts only one parameter.
 252  */
 253 static void __appldata_mod_vtimer_wrap(void *p) {
 254         struct {
 255                 struct vtimer_list *timer;
 256                 u64    expires;
 257         } *args = p;
 258         mod_virt_timer(args->timer, args->expires);
 259 }
 260
 261 #define APPLDATA_ADD_TIMER      0
 262 #define APPLDATA_DEL_TIMER      1
 263 #define APPLDATA_MOD_TIMER      2
 264
 265 /*
 266  * __appldata_vtimer_setup()
 267  *
 268  * Add, delete or modify virtual timers on all online cpus.
 269  * The caller needs to get the appldata_timer_lock spinlock.
 270  */
 271 static void
 272 __appldata_vtimer_setup(int cmd)
 273 {
 274         u64 per_cpu_interval;
 275         int i;
 276
 277         switch (cmd) {
 278         case APPLDATA_ADD_TIMER:
 279                 if (appldata_timer_active)
 280                         break;
 281                 per_cpu_interval = (u64) (appldata_interval*1000 /
 282                                           num_online_cpus()) * TOD_MICRO;
 283                 for_each_online_cpu(i) {
 284                         per_cpu(appldata_timer, i).expires = per_cpu_interval;
 285                         smp_call_function_on(add_virt_timer_periodic,
 286                                              &per_cpu(appldata_timer, i),
 287                                              0, 1, i);
 288                 }
 289                 appldata_timer_active = 1;
 290                 P_INFO("Monitoring timer started.\n");
 291                 break;
 292         case APPLDATA_DEL_TIMER:
 293                 for_each_online_cpu(i)
 294                         del_virt_timer(&per_cpu(appldata_timer, i));
 295                 if (!appldata_timer_active)
 296                         break;
 297                 appldata_timer_active = 0;
 298                 atomic_set(&appldata_expire_count, num_online_cpus());
 299                 P_INFO("Monitoring timer stopped.\n");
 300                 break;
 301         case APPLDATA_MOD_TIMER:
 302                 per_cpu_interval = (u64) (appldata_interval*1000 /
 303                                           num_online_cpus()) * TOD_MICRO;
 304                 if (!appldata_timer_active)
 305                         break;
 306                 for_each_online_cpu(i) {
 307                         struct {
 308                                 struct vtimer_list *timer;
 309                                 u64    expires;
 310                         } args;
 311                         args.timer = &per_cpu(appldata_timer, i);
 312                         args.expires = per_cpu_interval;
 313                         smp_call_function_on(__appldata_mod_vtimer_wrap,
 314                                              &args, 0, 1, i);
 315                 }
 316         }
 317 }
 318
 319 /*
 320  * appldata_timer_handler()
 321  *
 322  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 323  */
 324 static int
 325 appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
 326                            void __user *buffer, size_t *lenp, loff_t *ppos)
 327 {
 328         int len;
 329         char buf[2];
 330
 331         if (!*lenp || *ppos) {
 332                 *lenp = 0;
 333                 return 0;
 334         }
 335         if (!write) {
 336                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 337                 if (len > *lenp)
 338                         len = *lenp;
 339                 if (copy_to_user(buffer, buf, len))
 340                         return -EFAULT;
 341                 goto out;
 342         }
 343         len = *lenp;
 344         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 345                 return -EFAULT;
 346         spin_lock(&appldata_timer_lock);
 347         if (buf[0] == '1')
 348                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 349         else if (buf[0] == '0')
 350                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 351         spin_unlock(&appldata_timer_lock);
 352 out:
 353         *lenp = len;
 354         *ppos += len;
 355         return 0;
 356 }
 357
 358 /*
 359  * appldata_interval_handler()
 360  *
 361  * Set (CPU) timer interval for collection of data (in milliseconds), show
 362  * current timer interval.
 363  */
 364 static int
 365 appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
 366                            void __user *buffer, size_t *lenp, loff_t *ppos)
 367 {
 368         int len, interval;
 369         char buf[16];
 370
 371         if (!*lenp || *ppos) {
 372                 *lenp = 0;
 373                 return 0;
 374         }
 375         if (!write) {
 376                 len = sprintf(buf, "%i\n", appldata_interval);
 377                 if (len > *lenp)
 378                         len = *lenp;
 379                 if (copy_to_user(buffer, buf, len))
 380                         return -EFAULT;
 381                 goto out;
 382         }
 383         len = *lenp;
 384         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) {
 385                 return -EFAULT;
 386         }
 387         sscanf(buf, "%i", &interval);
 388         if (interval <= 0) {
 389                 P_ERROR("Timer CPU interval has to be > 0!\n");
 390                 return -EINVAL;
 391         }
 392
 393         spin_lock(&appldata_timer_lock);
 394         appldata_interval = interval;
 395         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 396         spin_unlock(&appldata_timer_lock);
 397
 398         P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
 399                  interval);
 400 out:
 401         *lenp = len;
 402         *ppos += len;
 403         return 0;
 404 }
 405
 406 /*
 407  * appldata_generic_handler()
 408  *
 409  * Generic start/stop monitoring and DIAG, show status of
 410  * monitoring (0 = not in process, 1 = in process)
 411  */
 412 static int
 413 appldata_generic_handler(ctl_table *ctl, int write, struct file *filp,
 414                            void __user *buffer, size_t *lenp, loff_t *ppos)
 415 {
 416         struct appldata_ops *ops = NULL, *tmp_ops;
 417         int rc, len, found;
 418         char buf[2];
 419         struct list_head *lh;
 420
 421         found = 0;
 422         spin_lock(&appldata_ops_lock);
 423         list_for_each(lh, &appldata_ops_list) {
 424                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 425                 if (&tmp_ops->ctl_table[2] == ctl) {
 426                         found = 1;
 427                 }
 428         }
 429         if (!found) {
 430                 spin_unlock(&appldata_ops_lock);
 431                 return -ENODEV;
 432         }
 433         ops = ctl->data;
 434         if (!try_module_get(ops->owner)) {      // protect this function
 435                 spin_unlock(&appldata_ops_lock);
 436                 return -ENODEV;
 437         }
 438         spin_unlock(&appldata_ops_lock);
 439
 440         if (!*lenp || *ppos) {
 441                 *lenp = 0;
 442                 module_put(ops->owner);
 443                 return 0;
 444         }
 445         if (!write) {
 446                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 447                 if (len > *lenp)
 448                         len = *lenp;
 449                 if (copy_to_user(buffer, buf, len)) {
 450                         module_put(ops->owner);
 451                         return -EFAULT;
 452                 }
 453                 goto out;
 454         }
 455         len = *lenp;
 456         if (copy_from_user(buf, buffer,
 457                            len > sizeof(buf) ? sizeof(buf) : len)) {
 458                 module_put(ops->owner);
 459                 return -EFAULT;
 460         }
 461
 462         spin_lock(&appldata_ops_lock);
 463         if ((buf[0] == '1') && (ops->active == 0)) {
 464                 // protect work queue callback
 465                 if (!try_module_get(ops->owner)) {
 466                         spin_unlock(&appldata_ops_lock);
 467                         module_put(ops->owner);
 468                         return -ENODEV;
 469                 }
 470                 ops->active = 1;
 471                 ops->callback(ops->data);       // init record
 472                 rc = appldata_diag(ops->record_nr,
 473                                         APPLDATA_START_INTERVAL_REC,
 474                                         (unsigned long) ops->data, ops->size);
 475                 if (rc != 0) {
 476                         P_ERROR("START DIAG 0xDC for %s failed, "
 477                                 "return code: %d\n", ops->name, rc);
 478                         module_put(ops->owner);
 479                         ops->active = 0;
 480                 } else {
 481                         P_INFO("Monitoring %s data enabled, "
 482                                 "DIAG 0xDC started.\n", ops->name);
 483                 }
 484         } else if ((buf[0] == '0') && (ops->active == 1)) {
 485                 ops->active = 0;
 486                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 487                                 (unsigned long) ops->data, ops->size);
 488                 if (rc != 0) {
 489                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 490                                 "return code: %d\n", ops->name, rc);
 491                 } else {
 492                         P_INFO("Monitoring %s data disabled, "
 493                                 "DIAG 0xDC stopped.\n", ops->name);
 494                 }
 495                 module_put(ops->owner);
 496         }
 497         spin_unlock(&appldata_ops_lock);
 498 out:
 499         *lenp = len;
 500         *ppos += len;
 501         module_put(ops->owner);
 502         return 0;
 503 }
 504
 505 /*************************** /proc stuff <END> *******************************/
 506
 507
 508 /************************* module-ops management *****************************/
 509 /*
 510  * appldata_register_ops()
 511  *
 512  * update ops list, register /proc/sys entries
 513  */
 514 int appldata_register_ops(struct appldata_ops *ops)
 515 {
 516         struct list_head *lh;
 517         struct appldata_ops *tmp_ops;
 518         int i;
 519
 520         i = 0;
 521
 522         if ((ops->size > APPLDATA_MAX_REC_SIZE) ||
 523                 (ops->size < 0)){
 524                 P_ERROR("Invalid size of %s record = %i, maximum = %i!\n",
 525                         ops->name, ops->size, APPLDATA_MAX_REC_SIZE);
 526                 return -ENOMEM;
 527         }
 528         if ((ops->ctl_nr == CTL_APPLDATA) ||
 529             (ops->ctl_nr == CTL_APPLDATA_TIMER) ||
 530             (ops->ctl_nr == CTL_APPLDATA_INTERVAL)) {
 531                 P_ERROR("ctl_nr %i already in use!\n", ops->ctl_nr);
 532                 return -EBUSY;
 533         }
 534         ops->ctl_table = kmalloc(4*sizeof(struct ctl_table), GFP_KERNEL);
 535         if (ops->ctl_table == NULL) {
 536                 P_ERROR("Not enough memory for %s ctl_table!\n", ops->name);
 537                 return -ENOMEM;
 538         }
 539         memset(ops->ctl_table, 0, 4*sizeof(struct ctl_table));
 540
 541         spin_lock(&appldata_ops_lock);
 542         list_for_each(lh, &appldata_ops_list) {
 543                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 544                 P_DEBUG("register_ops loop: %i) name = %s, ctl = %i\n",
 545                         ++i, tmp_ops->name, tmp_ops->ctl_nr);
 546                 P_DEBUG("Comparing %s (ctl %i) with %s (ctl %i)\n",
 547                         tmp_ops->name, tmp_ops->ctl_nr, ops->name,
 548                         ops->ctl_nr);
 549                 if (strncmp(tmp_ops->name, ops->name,
 550                                 APPLDATA_PROC_NAME_LENGTH) == 0) {
 551                         P_ERROR("Name \"%s\" already registered!\n", ops->name);
 552                         kfree(ops->ctl_table);
 553                         spin_unlock(&appldata_ops_lock);
 554                         return -EBUSY;
 555                 }
 556                 if (tmp_ops->ctl_nr == ops->ctl_nr) {
 557                         P_ERROR("ctl_nr %i already registered!\n", ops->ctl_nr);
 558                         kfree(ops->ctl_table);
 559                         spin_unlock(&appldata_ops_lock);
 560                         return -EBUSY;
 561                 }
 562         }
 563         list_add(&ops->list, &appldata_ops_list);
 564         spin_unlock(&appldata_ops_lock);
 565
 566         ops->ctl_table[0].ctl_name = CTL_APPLDATA;
 567         ops->ctl_table[0].procname = appldata_proc_name;
 568         ops->ctl_table[0].maxlen   = 0;
 569         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 570         ops->ctl_table[0].child    = &ops->ctl_table[2];
 571
 572         ops->ctl_table[1].ctl_name = 0;
 573
 574         ops->ctl_table[2].ctl_name = ops->ctl_nr;
 575         ops->ctl_table[2].procname = ops->name;
 576         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 577         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 578         ops->ctl_table[2].data = ops;
 579
 580         ops->ctl_table[3].ctl_name = 0;
 581
 582         ops->sysctl_header = register_sysctl_table(ops->ctl_table,1);
 583
 584         P_INFO("%s-ops registered!\n", ops->name);
 585         return 0;
 586 }
 587
 588 /*
 589  * appldata_unregister_ops()
 590  *
 591  * update ops list, unregister /proc entries, stop DIAG if necessary
 592  */
 593 void appldata_unregister_ops(struct appldata_ops *ops)
 594 {
 595         spin_lock(&appldata_ops_lock);
 596         unregister_sysctl_table(ops->sysctl_header);
 597         list_del(&ops->list);
 598         kfree(ops->ctl_table);
 599         ops->ctl_table = NULL;
 600         spin_unlock(&appldata_ops_lock);
 601         P_INFO("%s-ops unregistered!\n", ops->name);
 602 }
 603 /********************** module-ops management <END> **************************/
 604
 605
 606 /******************************* init / exit *********************************/
 607
 608 static void
 609 appldata_online_cpu(int cpu)
 610 {
 611         init_virt_timer(&per_cpu(appldata_timer, cpu));
 612         per_cpu(appldata_timer, cpu).function = appldata_timer_function;
 613         per_cpu(appldata_timer, cpu).data = (unsigned long)
 614                 &appldata_work;
 615         atomic_inc(&appldata_expire_count);
 616         spin_lock(&appldata_timer_lock);
 617         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 618         spin_unlock(&appldata_timer_lock);
 619 }
 620
 621 static void
 622 appldata_offline_cpu(int cpu)
 623 {
 624         del_virt_timer(&per_cpu(appldata_timer, cpu));
 625         if (atomic_dec_and_test(&appldata_expire_count)) {
 626                 atomic_set(&appldata_expire_count, num_online_cpus());
 627                 queue_work(appldata_wq, &appldata_work);
 628         }
 629         spin_lock(&appldata_timer_lock);
 630         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 631         spin_unlock(&appldata_timer_lock);
 632 }
 633
 634 static int
 635 appldata_cpu_notify(struct notifier_block *self,
 636                     unsigned long action, void *hcpu)
 637 {
 638         switch (action) {
 639         case CPU_ONLINE:
 640                 appldata_online_cpu((long) hcpu);
 641                 break;
 642 #ifdef CONFIG_HOTPLUG_CPU
 643         case CPU_DEAD:
 644                 appldata_offline_cpu((long) hcpu);
 645                 break;
 646 #endif
 647         default:
 648                 break;
 649         }
 650         return NOTIFY_OK;
 651 }
 652
 653 static struct notifier_block __devinitdata appldata_nb = {
 654         .notifier_call = appldata_cpu_notify,
 655 };
 656
 657 /*
 658  * appldata_init()
 659  *
 660  * init timer, register /proc entries
 661  */
 662 static int __init appldata_init(void)
 663 {
 664         int i;
 665
 666         P_DEBUG("sizeof(parameter_list) = %lu\n",
 667                 sizeof(struct appldata_parameter_list));
 668
 669         appldata_wq = create_singlethread_workqueue("appldata");
 670         if (!appldata_wq) {
 671                 P_ERROR("Could not create work queue\n");
 672                 return -ENOMEM;
 673         }
 674
 675         for_each_online_cpu(i)
 676                 appldata_online_cpu(i);
 677
 678         /* Register cpu hotplug notifier */
 679         register_cpu_notifier(&appldata_nb);
 680
 681         appldata_sysctl_header = register_sysctl_table(appldata_dir_table, 1);
 682 #ifdef MODULE
 683         appldata_dir_table[0].de->owner = THIS_MODULE;
 684         appldata_table[0].de->owner = THIS_MODULE;
 685         appldata_table[1].de->owner = THIS_MODULE;
 686 #endif
 687
 688         P_DEBUG("Base interface initialized.\n");
 689         return 0;
 690 }
 691
 692 /*
 693  * appldata_exit()
 694  *
 695  * stop timer, unregister /proc entries
 696  */
 697 static void __exit appldata_exit(void)
 698 {
 699         struct list_head *lh;
 700         struct appldata_ops *ops;
 701         int rc, i;
 702
 703         P_DEBUG("Unloading module ...\n");
 704         /*
 705          * ops list should be empty, but just in case something went wrong...
 706          */
 707         spin_lock(&appldata_ops_lock);
 708         list_for_each(lh, &appldata_ops_list) {
 709                 ops = list_entry(lh, struct appldata_ops, list);
 710                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 711                                 (unsigned long) ops->data, ops->size);
 712                 if (rc != 0) {
 713                         P_ERROR("STOP DIAG 0xDC for %s failed, "
 714                                 "return code: %d\n", ops->name, rc);
 715                 }
 716         }
 717         spin_unlock(&appldata_ops_lock);
 718
 719         for_each_online_cpu(i)
 720                 appldata_offline_cpu(i);
 721
 722         appldata_timer_active = 0;
 723
 724         unregister_sysctl_table(appldata_sysctl_header);
 725
 726         destroy_workqueue(appldata_wq);
 727         P_DEBUG("... module unloaded!\n");
 728 }
 729 /**************************** init / exit <END> ******************************/
 730
 731
 732 module_init(appldata_init);
 733 module_exit(appldata_exit);
 734 MODULE_LICENSE("GPL");
 735 MODULE_AUTHOR("Gerald Schaefer");
 736 MODULE_DESCRIPTION("Linux-VM Monitor Stream, base infrastructure");
 737
 738 EXPORT_SYMBOL_GPL(appldata_register_ops);
 739 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 740
 741 #ifdef MODULE
 742 /*
 743  * Kernel symbols needed by appldata_mem and appldata_os modules.
 744  * However, if this file is compiled as a module (for testing only), these
 745  * symbols are not exported. In this case, we define them locally and export
 746  * those.
 747  */
 748 void si_swapinfo(struct sysinfo *val)
 749 {
 750         val->freeswap = -1ul;
 751         val->totalswap = -1ul;
 752 }
 753
 754 unsigned long avenrun[3] = {-1 - FIXED_1/200, -1 - FIXED_1/200,
 755                                 -1 - FIXED_1/200};
 756 int nr_threads = -1;
 757
 758 void get_full_page_state(struct page_state *ps)
 759 {
 760         memset(ps, -1, sizeof(struct page_state));
 761 }
 762
 763 unsigned long nr_running(void)
 764 {
 765         return -1;
 766 }
 767
 768 unsigned long nr_iowait(void)
 769 {
 770         return -1;
 771 }
 772
 773 /*unsigned long nr_context_switches(void)
 774 {
 775         return -1;
 776 }*/
 777 #endif /* MODULE */
 778 EXPORT_SYMBOL_GPL(si_swapinfo);
 779 EXPORT_SYMBOL_GPL(nr_threads);
 780 EXPORT_SYMBOL_GPL(avenrun);
 781 EXPORT_SYMBOL_GPL(get_full_page_state);
 782 EXPORT_SYMBOL_GPL(nr_running);
 783 EXPORT_SYMBOL_GPL(nr_iowait);
 784 //EXPORT_SYMBOL_GPL(nr_context_switches);