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(struct ctl_table *ctl, int write,
  52                                   void __user *buffer, size_t *lenp, loff_t *ppos);
  53 static int appldata_interval_handler(struct 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(struct ctl_table *ctl, int write,
 205                            void __user *buffer, size_t *lenp, loff_t *ppos)
 206 {
 207         unsigned int len;
 208         char buf[2];
 209
 210         if (!*lenp || *ppos) {
 211                 *lenp = 0;
 212                 return 0;
 213         }
 214         if (!write) {
 215                 strncpy(buf, appldata_timer_active ? "1\n" : "0\n",
 216                         ARRAY_SIZE(buf));
 217                 len = strnlen(buf, ARRAY_SIZE(buf));
 218                 if (len > *lenp)
 219                         len = *lenp;
 220                 if (copy_to_user(buffer, buf, len))
 221                         return -EFAULT;
 222                 goto out;
 223         }
 224         len = *lenp;
 225         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 226                 return -EFAULT;
 227         spin_lock(&appldata_timer_lock);
 228         if (buf[0] == '1')
 229                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 230         else if (buf[0] == '0')
 231                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 232         spin_unlock(&appldata_timer_lock);
 233 out:
 234         *lenp = len;
 235         *ppos += len;
 236         return 0;
 237 }
 238
 239 /*
 240  * appldata_interval_handler()
 241  *
 242  * Set (CPU) timer interval for collection of data (in milliseconds), show
 243  * current timer interval.
 244  */
 245 static int
 246 appldata_interval_handler(struct ctl_table *ctl, int write,
 247                            void __user *buffer, size_t *lenp, loff_t *ppos)
 248 {
 249         unsigned int len;
 250         int interval;
 251         char buf[16];
 252
 253         if (!*lenp || *ppos) {
 254                 *lenp = 0;
 255                 return 0;
 256         }
 257         if (!write) {
 258                 len = sprintf(buf, "%i\n", appldata_interval);
 259                 if (len > *lenp)
 260                         len = *lenp;
 261                 if (copy_to_user(buffer, buf, len))
 262                         return -EFAULT;
 263                 goto out;
 264         }
 265         len = *lenp;
 266         if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
 267                 return -EFAULT;
 268         interval = 0;
 269         sscanf(buf, "%i", &interval);
 270         if (interval <= 0)
 271                 return -EINVAL;
 272
 273         spin_lock(&appldata_timer_lock);
 274         appldata_interval = interval;
 275         __appldata_vtimer_setup(APPLDATA_MOD_TIMER);
 276         spin_unlock(&appldata_timer_lock);
 277 out:
 278         *lenp = len;
 279         *ppos += len;
 280         return 0;
 281 }
 282
 283 /*
 284  * appldata_generic_handler()
 285  *
 286  * Generic start/stop monitoring and DIAG, show status of
 287  * monitoring (0 = not in process, 1 = in process)
 288  */
 289 static int
 290 appldata_generic_handler(struct ctl_table *ctl, int write,
 291                            void __user *buffer, size_t *lenp, loff_t *ppos)
 292 {
 293         struct appldata_ops *ops = NULL, *tmp_ops;
 294         unsigned int len;
 295         int rc, found;
 296         char buf[2];
 297         struct list_head *lh;
 298
 299         found = 0;
 300         mutex_lock(&appldata_ops_mutex);
 301         list_for_each(lh, &appldata_ops_list) {
 302                 tmp_ops = list_entry(lh, struct appldata_ops, list);
 303                 if (&tmp_ops->ctl_table[2] == ctl) {
 304                         found = 1;
 305                 }
 306         }
 307         if (!found) {
 308                 mutex_unlock(&appldata_ops_mutex);
 309                 return -ENODEV;
 310         }
 311         ops = ctl->data;
 312         if (!try_module_get(ops->owner)) {      // protect this function
 313                 mutex_unlock(&appldata_ops_mutex);
 314                 return -ENODEV;
 315         }
 316         mutex_unlock(&appldata_ops_mutex);
 317
 318         if (!*lenp || *ppos) {
 319                 *lenp = 0;
 320                 module_put(ops->owner);
 321                 return 0;
 322         }
 323         if (!write) {
 324                 strncpy(buf, ops->active ? "1\n" : "0\n", ARRAY_SIZE(buf));
 325                 len = strnlen(buf, ARRAY_SIZE(buf));
 326                 if (len > *lenp)
 327                         len = *lenp;
 328                 if (copy_to_user(buffer, buf, len)) {
 329                         module_put(ops->owner);
 330                         return -EFAULT;
 331                 }
 332                 goto out;
 333         }
 334         len = *lenp;
 335         if (copy_from_user(buf, buffer,
 336                            len > sizeof(buf) ? sizeof(buf) : len)) {
 337                 module_put(ops->owner);
 338                 return -EFAULT;
 339         }
 340
 341         mutex_lock(&appldata_ops_mutex);
 342         if ((buf[0] == '1') && (ops->active == 0)) {
 343                 // protect work queue callback
 344                 if (!try_module_get(ops->owner)) {
 345                         mutex_unlock(&appldata_ops_mutex);
 346                         module_put(ops->owner);
 347                         return -ENODEV;
 348                 }
 349                 ops->callback(ops->data);       // init record
 350                 rc = appldata_diag(ops->record_nr,
 351                                         APPLDATA_START_INTERVAL_REC,
 352                                         (unsigned long) ops->data, ops->size,
 353                                         ops->mod_lvl);
 354                 if (rc != 0) {
 355                         pr_err("Starting the data collection for %s "
 356                                "failed with rc=%d\n", ops->name, rc);
 357                         module_put(ops->owner);
 358                 } else
 359                         ops->active = 1;
 360         } else if ((buf[0] == '0') && (ops->active == 1)) {
 361                 ops->active = 0;
 362                 rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 363                                 (unsigned long) ops->data, ops->size,
 364                                 ops->mod_lvl);
 365                 if (rc != 0)
 366                         pr_err("Stopping the data collection for %s "
 367                                "failed with rc=%d\n", ops->name, rc);
 368                 module_put(ops->owner);
 369         }
 370         mutex_unlock(&appldata_ops_mutex);
 371 out:
 372         *lenp = len;
 373         *ppos += len;
 374         module_put(ops->owner);
 375         return 0;
 376 }
 377
 378 /*************************** /proc stuff <END> *******************************/
 379
 380
 381 /************************* module-ops management *****************************/
 382 /*
 383  * appldata_register_ops()
 384  *
 385  * update ops list, register /proc/sys entries
 386  */
 387 int appldata_register_ops(struct appldata_ops *ops)
 388 {
 389         if (ops->size > APPLDATA_MAX_REC_SIZE)
 390                 return -EINVAL;
 391
 392         ops->ctl_table = kzalloc(4 * sizeof(struct ctl_table), GFP_KERNEL);
 393         if (!ops->ctl_table)
 394                 return -ENOMEM;
 395
 396         mutex_lock(&appldata_ops_mutex);
 397         list_add(&ops->list, &appldata_ops_list);
 398         mutex_unlock(&appldata_ops_mutex);
 399
 400         ops->ctl_table[0].procname = appldata_proc_name;
 401         ops->ctl_table[0].maxlen   = 0;
 402         ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
 403         ops->ctl_table[0].child    = &ops->ctl_table[2];
 404
 405         ops->ctl_table[2].procname = ops->name;
 406         ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
 407         ops->ctl_table[2].proc_handler = appldata_generic_handler;
 408         ops->ctl_table[2].data = ops;
 409
 410         ops->sysctl_header = register_sysctl_table(ops->ctl_table);
 411         if (!ops->sysctl_header)
 412                 goto out;
 413         return 0;
 414 out:
 415         mutex_lock(&appldata_ops_mutex);
 416         list_del(&ops->list);
 417         mutex_unlock(&appldata_ops_mutex);
 418         kfree(ops->ctl_table);
 419         return -ENOMEM;
 420 }
 421
 422 /*
 423  * appldata_unregister_ops()
 424  *
 425  * update ops list, unregister /proc entries, stop DIAG if necessary
 426  */
 427 void appldata_unregister_ops(struct appldata_ops *ops)
 428 {
 429         mutex_lock(&appldata_ops_mutex);
 430         list_del(&ops->list);
 431         mutex_unlock(&appldata_ops_mutex);
 432         unregister_sysctl_table(ops->sysctl_header);
 433         kfree(ops->ctl_table);
 434 }
 435 /********************** module-ops management <END> **************************/
 436
 437
 438 /**************************** suspend / resume *******************************/
 439 static int appldata_freeze(struct device *dev)
 440 {
 441         struct appldata_ops *ops;
 442         int rc;
 443         struct list_head *lh;
 444
 445         spin_lock(&appldata_timer_lock);
 446         if (appldata_timer_active) {
 447                 __appldata_vtimer_setup(APPLDATA_DEL_TIMER);
 448                 appldata_timer_suspended = 1;
 449         }
 450         spin_unlock(&appldata_timer_lock);
 451
 452         mutex_lock(&appldata_ops_mutex);
 453         list_for_each(lh, &appldata_ops_list) {
 454                 ops = list_entry(lh, struct appldata_ops, list);
 455                 if (ops->active == 1) {
 456                         rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
 457                                         (unsigned long) ops->data, ops->size,
 458                                         ops->mod_lvl);
 459                         if (rc != 0)
 460                                 pr_err("Stopping the data collection for %s "
 461                                        "failed with rc=%d\n", ops->name, rc);
 462                 }
 463         }
 464         mutex_unlock(&appldata_ops_mutex);
 465         return 0;
 466 }
 467
 468 static int appldata_restore(struct device *dev)
 469 {
 470         struct appldata_ops *ops;
 471         int rc;
 472         struct list_head *lh;
 473
 474         spin_lock(&appldata_timer_lock);
 475         if (appldata_timer_suspended) {
 476                 __appldata_vtimer_setup(APPLDATA_ADD_TIMER);
 477                 appldata_timer_suspended = 0;
 478         }
 479         spin_unlock(&appldata_timer_lock);
 480
 481         mutex_lock(&appldata_ops_mutex);
 482         list_for_each(lh, &appldata_ops_list) {
 483                 ops = list_entry(lh, struct appldata_ops, list);
 484                 if (ops->active == 1) {
 485                         ops->callback(ops->data);       // init record
 486                         rc = appldata_diag(ops->record_nr,
 487                                         APPLDATA_START_INTERVAL_REC,
 488                                         (unsigned long) ops->data, ops->size,
 489                                         ops->mod_lvl);
 490                         if (rc != 0) {
 491                                 pr_err("Starting the data collection for %s "
 492                                        "failed with rc=%d\n", ops->name, rc);
 493                         }
 494                 }
 495         }
 496         mutex_unlock(&appldata_ops_mutex);
 497         return 0;
 498 }
 499
 500 static int appldata_thaw(struct device *dev)
 501 {
 502         return appldata_restore(dev);
 503 }
 504
 505 static const struct dev_pm_ops appldata_pm_ops = {
 506         .freeze         = appldata_freeze,
 507         .thaw           = appldata_thaw,
 508         .restore        = appldata_restore,
 509 };
 510
 511 static struct platform_driver appldata_pdrv = {
 512         .driver = {
 513                 .name   = "appldata",
 514                 .pm     = &appldata_pm_ops,
 515         },
 516 };
 517 /************************* suspend / resume <END> ****************************/
 518
 519
 520 /******************************* init / exit *********************************/
 521
 522 /*
 523  * appldata_init()
 524  *
 525  * init timer, register /proc entries
 526  */
 527 static int __init appldata_init(void)
 528 {
 529         int rc;
 530
 531         init_virt_timer(&appldata_timer);
 532         appldata_timer.function = appldata_timer_function;
 533         appldata_timer.data = (unsigned long) &appldata_work;
 534
 535         rc = platform_driver_register(&appldata_pdrv);
 536         if (rc)
 537                 return rc;
 538
 539         appldata_pdev = platform_device_register_simple("appldata", -1, NULL,
 540                                                         0);
 541         if (IS_ERR(appldata_pdev)) {
 542                 rc = PTR_ERR(appldata_pdev);
 543                 goto out_driver;
 544         }
 545         appldata_wq = create_singlethread_workqueue("appldata");
 546         if (!appldata_wq) {
 547                 rc = -ENOMEM;
 548                 goto out_device;
 549         }
 550
 551         appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
 552         return 0;
 553
 554 out_device:
 555         platform_device_unregister(appldata_pdev);
 556 out_driver:
 557         platform_driver_unregister(&appldata_pdrv);
 558         return rc;
 559 }
 560
 561 __initcall(appldata_init);
 562
 563 /**************************** init / exit <END> ******************************/
 564
 565 EXPORT_SYMBOL_GPL(appldata_register_ops);
 566 EXPORT_SYMBOL_GPL(appldata_unregister_ops);
 567 EXPORT_SYMBOL_GPL(appldata_diag);
 568
 569 #ifdef CONFIG_SWAP
 570 EXPORT_SYMBOL_GPL(si_swapinfo);
 571 #endif
 572 EXPORT_SYMBOL_GPL(nr_threads);
 573 EXPORT_SYMBOL_GPL(nr_running);
 574 EXPORT_SYMBOL_GPL(nr_iowait);