arch/s390/appldata/appldata_base.c

   1 /*
   2  * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
   3  * Exports appldata_register_ops() and appldata_unregister_ops() for the
   4  * data gathering modules.
   5  *
   6  * Copyright IBM Corp. 2003, 2009
   7  *
   8  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
   9  */
  10
  11 #define KMSG_COMPONENT  "appldata"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/errno.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/mm.h>
  21 #include <linux/swap.h>
  22 #include <linux/pagemap.h>
  23 #include <linux/sysctl.h>
  24 #include <linux/notifier.h>
  25 #include <linux/cpu.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/suspend.h>
  28 #include <linux/platform_device.h>
  29 #include <asm/appldata.h>
  30 #include <asm/vtimer.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/io.h>
  33 #include <asm/smp.h>
  34
  35 #include "appldata.h"
  36
  37
  38 #define APPLDATA_CPU_INTERVAL   10000           /* default (CPU) time for
  39                                                    sampling interval in
  40                                                    milliseconds */
  41
  42 #define TOD_MICRO       0x01000                 /* nr. of TOD clock units
  43                                                    for 1 microsecond */
  44
  45 static struct platform_device *appldata_pdev;
  46
  47 /*
  48  * /proc entries (sysctl)
  49  */
  50 static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
  51 static int appldata_timer_handler(ctl_table *ctl, int write,
  52                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  53 static int appldata_interval_handler(ctl_table *ctl, int write,
  54                                          void __user *buffer,
  55                                          size_t *lenp, loff_t *ppos);
  56
  57 static struct ctl_table_header *appldata_sysctl_header;
  58 static struct ctl_table appldata_table[] = {
  59         {
  60                 .procname       = "timer",
  61                 .mode           = S_IRUGO | S_IWUSR,
  62                 .proc_handler   = appldata_timer_handler,
  63         },
  64         {
  65                 .procname       = "interval",
  66                 .mode           = S_IRUGO | S_IWUSR,
  67                 .proc_handler   = appldata_interval_handler,
  68         },
  69         { },
  70 };
  71
  72 static struct ctl_table appldata_dir_table[] = {
  73         {
  74                 .procname       = appldata_proc_name,
  75                 .maxlen         = 0,
  76                 .mode           = S_IRUGO | S_IXUGO,
  77                 .child          = appldata_table,
  78         },
  79         { },
  80 };
  81
  82 /*
  83  * Timer
  84  */
  85 static struct vtimer_list appldata_timer;
  86
  87 static DEFINE_SPINLOCK(appldata_timer_lock);
  88 static int appldata_interval = APPLDATA_CPU_INTERVAL;
  89 static int appldata_timer_active;
  90 static int appldata_timer_suspended = 0;
  91
  92 /*
  93  * Work queue
  94  */
  95 static struct workqueue_struct *appldata_wq;
  96 static void appldata_work_fn(struct work_struct *work);
  97 static DECLARE_WORK(appldata_work, appldata_work_fn);
  98
  99
 100 /*
 101  * Ops list
 102  */
 103 static DEFINE_MUTEX(appldata_ops_mutex);
 104 static LIST_HEAD(appldata_ops_list);
 105
 106
 107 /*************************** timer, work, DIAG *******************************/
 108 /*
 109  * appldata_timer_function()
 110  *
 111  * schedule work and reschedule timer
 112  */
 113 static void appldata_timer_function(unsigned long data)
 114 {
 115         queue_work(appldata_wq, (struct work_struct *) data);
 116 }
 117
 118 /*
 119  * appldata_work_fn()
 120  *
 121  * call data gathering function for each (active) module
 122  */
 123 static void appldata_work_fn(struct work_struct *work)
 124 {
 125         struct list_head *lh;
 126         struct appldata_ops *ops;
 127
 128         mutex_lock(&appldata_ops_mutex);
 129         list_for_each(lh, &appldata_ops_list) {
 130                 ops = list_entry(lh, struct appldata_ops, list);
 131                 if (ops->active == 1) {
 132                         ops->callback(ops->data);
 133                 }
 134         }
 135         mutex_unlock(&appldata_ops_mutex);
 136 }
 137
 138 /*
 139  * appldata_diag()
 140  *
 141  * prepare parameter list, issue DIAG 0xDC
 142  */
 143 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 144                         u16 length, char *mod_lvl)
 145 {
 146         struct appldata_product_id id = {
 147                 .prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
 148                                0xE7, 0xD2, 0xD9},       /* "LINUXKR" */
 149                 .prod_fn    = 0xD5D3,                   /* "NL" */
 150                 .version_nr = 0xF2F6,                   /* "26" */
 151                 .release_nr = 0xF0F1,                   /* "01" */
 152         };
 153
 154         id.record_nr = record_nr;
 155         id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
 156         return appldata_asm(&id, function, (void *) buffer, length);
 157 }
 158 /************************ timer, work, DIAG <END> ****************************/
 159
 160
 161 /****************************** /proc stuff **********************************/
 162
 163 #define APPLDATA_ADD_TIMER      0
 164 #define APPLDATA_DEL_TIMER      1
 165 #define APPLDATA_MOD_TIMER      2
 166
 167 /*
 168  * __appldata_vtimer_setup()
 169  *
 170  * Add, delete or modify virtual timers on all online cpus.
 171  * The caller needs to get the appldata_timer_lock spinlock.
 172  */
 173 static void __appldata_vtimer_setup(int cmd)
 174 {
 175         u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO;
 176
 177         switch (cmd) {
 178         case APPLDATA_ADD_TIMER:
 179                 if (appldata_timer_active)
 180                         break;
 181                 appldata_timer.expires = timer_interval;
 182                 add_virt_timer_periodic(&appldata_timer);
 183                 appldata_timer_active = 1;
 184                 break;
 185         case APPLDATA_DEL_TIMER:
 186                 del_virt_timer(&appldata_timer);
 187                 if (!appldata_timer_active)
 188                         break;
 189                 appldata_timer_active = 0;
 190                 break;
 191         case APPLDATA_MOD_TIMER:
 192                 if (!appldata_timer_active)
 193                         break;
 194                 mod_virt_timer_periodic(&appldata_timer, timer_interval);
 195         }
 196 }
 197
 198 /*
 199  * appldata_timer_handler()
 200  *
 201  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 202  */
 203 static int
 204 appldata_timer_handler(ctl_table *ctl, int write,
 205                            void __user *buffer, size_t *lenp, loff_t *ppos)
 206 {
 207         int len;
 208         char buf[2];
 209
 210         if (!*lenp || *ppos) {
 211                 *lenp = 0;
 212                 return 0;
 213         }
 214         if (!write) {
 215                 len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
 216                 if (len > *lenp)
 217                         len = *lenp;
 218                 if (copy_to_user(buffer, buf, len))
 219                         return -EFAULT;
 220                 goto out;
 221         }
 222         len = *lenp;
 223         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 224                 return -EFAULT;
 225         spin_lock(&appldata_timer_lock);
 226         if (buf[0] == '1')
 227                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 228         else if (buf[0] == '0')
 229                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 230         spin_unlock(&appldata_timer_lock);
 231 out:
 232         *lenp = len;
 233         *ppos += len;
 234         return 0;
 235 }
 236
 237 /*
 238  * appldata_interval_handler()
 239  *
 240  * Set (CPU) timer interval for collection of data (in milliseconds), show
 241  * current timer interval.
 242  */
 243 static int
 244 appldata_interval_handler(ctl_table *ctl, int write,
 245                            void __user *buffer, size_t *lenp, loff_t *ppos)
 246 {
 247         int len, interval;
 248         char buf[16];
 249
 250         if (!*lenp || *ppos) {
 251                 *lenp = 0;
 252                 return 0;
 253         }
 254         if (!write) {
 255                 len = sprintf(buf, "%i\n", appldata_interval);
 256                 if (len > *lenp)
 257                         len = *lenp;
 258                 if (copy_to_user(buffer, buf, len))
 259                         return -EFAULT;
 260                 goto out;
 261         }
 262         len = *lenp;
 263         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 264                 return -EFAULT;
 265         interval = 0;
 266         sscanf(buf, "%i", &interval);
 267         if (interval <= 0)
 268                 return -EINVAL;
 269
 270         spin_lock(&appldata_timer_lock);
 271         appldata_interval = interval;
 272         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 273         spin_unlock(&appldata_timer_lock);
 274 out:
 275         *lenp = len;
 276         *ppos += len;
 277         return 0;
 278 }
 279
 280 /*
 281  * appldata_generic_handler()
 282  *
 283  * Generic start/stop monitoring and DIAG, show status of
 284  * monitoring (0 = not in process, 1 = in process)
 285  */
 286 static int
 287 appldata_generic_handler(ctl_table *ctl, int write,
 288                            void __user *buffer, size_t *lenp, loff_t *ppos)
 289 {
 290         struct appldata_ops *ops = NULL, *tmp_ops;
 291         int rc, len, found;
 292         char buf[2];
 293         struct list_head *lh;
 294
 295         found = 0;
 296         mutex_lock(&appldata_ops_mutex);
 297         list_for_each(lh, &appldata_ops_list) {
 298                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 299                 if (&tmp_ops->ctl_table[2] == ctl) {
 300                         found = 1;
 301                 }
 302         }
 303         if (!found) {
 304                 mutex_unlock(&appldata_ops_mutex);
 305                 return -ENODEV;
 306         }
 307         ops = ctl->data;
 308         if (!try_module_get(ops->owner)) {      // protect this function
 309                 mutex_unlock(&appldata_ops_mutex);
 310                 return -ENODEV;
 311         }
 312         mutex_unlock(&appldata_ops_mutex);
 313
 314         if (!*lenp || *ppos) {
 315                 *lenp = 0;
 316                 module_put(ops->owner);
 317                 return 0;
 318         }
 319         if (!write) {
 320                 len = sprintf(buf, ops->active ? "1\n" : "0\n");
 321                 if (len > *lenp)
 322                         len = *lenp;
 323                 if (copy_to_user(buffer, buf, len)) {
 324                         module_put(ops->owner);
 325                         return -EFAULT;
 326                 }
 327                 goto out;
 328         }
 329         len = *lenp;
 330         if (copy_from_user(buf, buffer,
 331                            len > sizeof(buf) ? sizeof(buf) : len)) {
 332                 module_put(ops->owner);
 333                 return -EFAULT;
 334         }
 335
 336         mutex_lock(&appldata_ops_mutex);
 337         if ((buf[0] == '1') && (ops->active == 0)) {
 338                 // protect work queue callback
 339                 if (!try_module_get(ops->owner)) {
 340                         mutex_unlock(&appldata_ops_mutex);
 341                         module_put(ops->owner);
 342                         return -ENODEV;
 343                 }
 344                 ops->callback(ops->data);       // init record
 345                 rc = appldata_diag(ops->record_nr,
 346                                         APPLDATA_START_INTERVAL_REC,
 347                                         (unsigned long) ops->data, ops->size,
 348                                         ops->mod_lvl);
 349                 if (rc != 0) {
 350                         pr_err("Starting the data collection for %s "
 351                                "failed with rc=%d\n", ops->name, rc);
 352                         module_put(ops->owner);
 353                 } else
 354                         ops->active = 1;
 355         } else if ((buf[0] == '0') && (ops->active == 1)) {
 356                 ops->active = 0;
 357                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 358                                 (unsigned long) ops->data, ops->size,
 359                                 ops->mod_lvl);
 360                 if (rc != 0)
 361                         pr_err("Stopping the data collection for %s "
 362                                "failed with rc=%d\n", ops->name, rc);
 363                 module_put(ops->owner);
 364         }
 365         mutex_unlock(&appldata_ops_mutex);
 366 out:
 367         *lenp = len;
 368         *ppos += len;
 369         module_put(ops->owner);
 370         return 0;
 371 }
 372
 373 /*************************** /proc stuff <END> *******************************/
 374
 375
 376 /************************* module-ops management *****************************/
 377 /*
 378  * appldata_register_ops()
 379  *
 380  * update ops list, register /proc/sys entries
 381  */
 382 int appldata_register_ops(struct appldata_ops *ops)
 383 {
 384         if (ops->size > APPLDATA_MAX_REC_SIZE)
 385                 return -EINVAL;
 386
 387         ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
 388         if (!ops->ctl_table)
 389                 return -ENOMEM;
 390
 391         mutex_lock(&appldata_ops_mutex);
 392         list_add(&ops->list, &appldata_ops_list);
 393         mutex_unlock(&appldata_ops_mutex);
 394
 395         ops->ctl_table[0].procname = appldata_proc_name;
 396         ops->ctl_table[0].maxlen   = 0;
 397         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 398         ops->ctl_table[0].child    = &ops->ctl_table[2];
 399
 400         ops->ctl_table[2].procname = ops->name;
 401         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 402         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 403         ops->ctl_table[2].data = ops;
 404
 405         ops->sysctl_header = register_sysctl_table(ops->ctl_table);
 406         if (!ops->sysctl_header)
 407                 goto out;
 408         return 0;
 409 out:
 410         mutex_lock(&appldata_ops_mutex);
 411         list_del(&ops->list);
 412         mutex_unlock(&appldata_ops_mutex);
 413         kfree(ops->ctl_table);
 414         return -ENOMEM;
 415 }
 416
 417 /*
 418  * appldata_unregister_ops()
 419  *
 420  * update ops list, unregister /proc entries, stop DIAG if necessary
 421  */
 422 void appldata_unregister_ops(struct appldata_ops *ops)
 423 {
 424         mutex_lock(&appldata_ops_mutex);
 425         list_del(&ops->list);
 426         mutex_unlock(&appldata_ops_mutex);
 427         unregister_sysctl_table(ops->sysctl_header);
 428         kfree(ops->ctl_table);
 429 }
 430 /********************** module-ops management <END> **************************/
 431
 432
 433 /**************************** suspend / resume *******************************/
 434 static int appldata_freeze(struct device *dev)
 435 {
 436         struct appldata_ops *ops;
 437         int rc;
 438         struct list_head *lh;
 439
 440         spin_lock(&appldata_timer_lock);
 441         if (appldata_timer_active) {
 442                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 443                 appldata_timer_suspended = 1;
 444         }
 445         spin_unlock(&appldata_timer_lock);
 446
 447         mutex_lock(&appldata_ops_mutex);
 448         list_for_each(lh, &appldata_ops_list) {
 449                 ops = list_entry(lh, struct appldata_ops, list);
 450                 if (ops->active == 1) {
 451                         rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 452                                         (unsigned long) ops->data, ops->size,
 453                                         ops->mod_lvl);
 454                         if (rc != 0)
 455                                 pr_err("Stopping the data collection for %s "
 456                                        "failed with rc=%d\n", ops->name, rc);
 457                 }
 458         }
 459         mutex_unlock(&appldata_ops_mutex);
 460         return 0;
 461 }
 462
 463 static int appldata_restore(struct device *dev)
 464 {
 465         struct appldata_ops *ops;
 466         int rc;
 467         struct list_head *lh;
 468
 469         spin_lock(&appldata_timer_lock);
 470         if (appldata_timer_suspended) {
 471                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 472                 appldata_timer_suspended = 0;
 473         }
 474         spin_unlock(&appldata_timer_lock);
 475
 476         mutex_lock(&appldata_ops_mutex);
 477         list_for_each(lh, &appldata_ops_list) {
 478                 ops = list_entry(lh, struct appldata_ops, list);
 479                 if (ops->active == 1) {
 480                         ops->callback(ops->data);       // init record
 481                         rc = appldata_diag(ops->record_nr,
 482                                         APPLDATA_START_INTERVAL_REC,
 483                                         (unsigned long) ops->data, ops->size,
 484                                         ops->mod_lvl);
 485                         if (rc != 0) {
 486                                 pr_err("Starting the data collection for %s "
 487                                        "failed with rc=%d\n", ops->name, rc);
 488                         }
 489                 }
 490         }
 491         mutex_unlock(&appldata_ops_mutex);
 492         return 0;
 493 }
 494
 495 static int appldata_thaw(struct device *dev)
 496 {
 497         return appldata_restore(dev);
 498 }
 499
 500 static const struct dev_pm_ops appldata_pm_ops = {
 501         .freeze         = appldata_freeze,
 502         .thaw           = appldata_thaw,
 503         .restore        = appldata_restore,
 504 };
 505
 506 static struct platform_driver appldata_pdrv = {
 507         .driver = {
 508                 .name   = "appldata",
 509                 .owner  = THIS_MODULE,
 510                 .pm     = &appldata_pm_ops,
 511         },
 512 };
 513 /************************* suspend / resume <END> ****************************/
 514
 515
 516 /******************************* init / exit *********************************/
 517
 518 /*
 519  * appldata_init()
 520  *
 521  * init timer, register /proc entries
 522  */
 523 static int __init appldata_init(void)
 524 {
 525         int rc;
 526
 527         appldata_timer.function = appldata_timer_function;
 528         appldata_timer.data = (unsigned long) &appldata_work;
 529
 530         rc = platform_driver_register(&appldata_pdrv);
 531         if (rc)
 532                 return rc;
 533
 534         appldata_pdev = platform_device_register_simple("appldata", -1, NULL,
 535                                                         0);
 536         if (IS_ERR(appldata_pdev)) {
 537                 rc = PTR_ERR(appldata_pdev);
 538                 goto out_driver;
 539         }
 540         appldata_wq = create_singlethread_workqueue("appldata");
 541         if (!appldata_wq) {
 542                 rc = -ENOMEM;
 543                 goto out_device;
 544         }
 545
 546         appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
 547         return 0;
 548
 549 out_device:
 550         platform_device_unregister(appldata_pdev);
 551 out_driver:
 552         platform_driver_unregister(&appldata_pdrv);
 553         return rc;
 554 }
 555
 556 __initcall(appldata_init);
 557
 558 /**************************** init / exit <END> ******************************/
 559
 560 EXPORT_SYMBOL_GPL(appldata_register_ops);
 561 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 562 EXPORT_SYMBOL_GPL(appldata_diag);
 563
 564 #ifdef CONFIG_SWAP
 565 EXPORT_SYMBOL_GPL(si_swapinfo);
 566 #endif
 567 EXPORT_SYMBOL_GPL(nr_threads);
 568 EXPORT_SYMBOL_GPL(nr_running);
 569 EXPORT_SYMBOL_GPL(nr_iowait);