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