drivers/staging/lustre/lustre/libcfs/module.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38
  39 #include <linux/libcfs/libcfs.h>
  40 #include <linux/libcfs/libcfs_crypto.h>
  41 #include <linux/lnet/lib-lnet.h>
  42 #include <linux/lnet/lnet.h>
  43 #include "tracefile.h"
  44
  45 void
  46 kportal_memhog_free (struct libcfs_device_userstate *ldu)
  47 {
  48         struct page **level0p = &ldu->ldu_memhog_root_page;
  49         struct page **level1p;
  50         struct page **level2p;
  51         int        count1;
  52         int        count2;
  53
  54         if (*level0p != NULL) {
  55
  56                 level1p = (struct page **)page_address(*level0p);
  57                 count1 = 0;
  58
  59                 while (count1 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
  60                        *level1p != NULL) {
  61
  62                         level2p = (struct page **)page_address(*level1p);
  63                         count2 = 0;
  64
  65                         while (count2 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
  66                                *level2p != NULL) {
  67
  68                                 __free_page(*level2p);
  69                                 ldu->ldu_memhog_pages--;
  70                                 level2p++;
  71                                 count2++;
  72                         }
  73
  74                         __free_page(*level1p);
  75                         ldu->ldu_memhog_pages--;
  76                         level1p++;
  77                         count1++;
  78                 }
  79
  80                 __free_page(*level0p);
  81                 ldu->ldu_memhog_pages--;
  82
  83                 *level0p = NULL;
  84         }
  85
  86         LASSERT (ldu->ldu_memhog_pages == 0);
  87 }
  88
  89 int
  90 kportal_memhog_alloc (struct libcfs_device_userstate *ldu, int npages, int flags)
  91 {
  92         struct page **level0p;
  93         struct page **level1p;
  94         struct page **level2p;
  95         int        count1;
  96         int        count2;
  97
  98         LASSERT (ldu->ldu_memhog_pages == 0);
  99         LASSERT (ldu->ldu_memhog_root_page == NULL);
 100
 101         if (npages < 0)
 102                 return -EINVAL;
 103
 104         if (npages == 0)
 105                 return 0;
 106
 107         level0p = &ldu->ldu_memhog_root_page;
 108         *level0p = alloc_page(flags);
 109         if (*level0p == NULL)
 110                 return -ENOMEM;
 111         ldu->ldu_memhog_pages++;
 112
 113         level1p = (struct page **)page_address(*level0p);
 114         count1 = 0;
 115         memset(level1p, 0, PAGE_CACHE_SIZE);
 116
 117         while (ldu->ldu_memhog_pages < npages &&
 118                count1 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
 119
 120                 if (cfs_signal_pending())
 121                         return (-EINTR);
 122
 123                 *level1p = alloc_page(flags);
 124                 if (*level1p == NULL)
 125                         return -ENOMEM;
 126                 ldu->ldu_memhog_pages++;
 127
 128                 level2p = (struct page **)page_address(*level1p);
 129                 count2 = 0;
 130                 memset(level2p, 0, PAGE_CACHE_SIZE);
 131
 132                 while (ldu->ldu_memhog_pages < npages &&
 133                        count2 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
 134
 135                         if (cfs_signal_pending())
 136                                 return (-EINTR);
 137
 138                         *level2p = alloc_page(flags);
 139                         if (*level2p == NULL)
 140                                 return (-ENOMEM);
 141                         ldu->ldu_memhog_pages++;
 142
 143                         level2p++;
 144                         count2++;
 145                 }
 146
 147                 level1p++;
 148                 count1++;
 149         }
 150
 151         return 0;
 152 }
 153
 154 /* called when opening /dev/device */
 155 static int libcfs_psdev_open(unsigned long flags, void *args)
 156 {
 157         struct libcfs_device_userstate *ldu;
 158         ENTRY;
 159
 160         try_module_get(THIS_MODULE);
 161
 162         LIBCFS_ALLOC(ldu, sizeof(*ldu));
 163         if (ldu != NULL) {
 164                 ldu->ldu_memhog_pages = 0;
 165                 ldu->ldu_memhog_root_page = NULL;
 166         }
 167         *(struct libcfs_device_userstate **)args = ldu;
 168
 169         RETURN(0);
 170 }
 171
 172 /* called when closing /dev/device */
 173 static int libcfs_psdev_release(unsigned long flags, void *args)
 174 {
 175         struct libcfs_device_userstate *ldu;
 176         ENTRY;
 177
 178         ldu = (struct libcfs_device_userstate *)args;
 179         if (ldu != NULL) {
 180                 kportal_memhog_free(ldu);
 181                 LIBCFS_FREE(ldu, sizeof(*ldu));
 182         }
 183
 184         module_put(THIS_MODULE);
 185         RETURN(0);
 186 }
 187
 188 static struct rw_semaphore ioctl_list_sem;
 189 static struct list_head ioctl_list;
 190
 191 int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand)
 192 {
 193         int rc = 0;
 194
 195         down_write(&ioctl_list_sem);
 196         if (!list_empty(&hand->item))
 197                 rc = -EBUSY;
 198         else
 199                 list_add_tail(&hand->item, &ioctl_list);
 200         up_write(&ioctl_list_sem);
 201
 202         return rc;
 203 }
 204 EXPORT_SYMBOL(libcfs_register_ioctl);
 205
 206 int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)
 207 {
 208         int rc = 0;
 209
 210         down_write(&ioctl_list_sem);
 211         if (list_empty(&hand->item))
 212                 rc = -ENOENT;
 213         else
 214                 list_del_init(&hand->item);
 215         up_write(&ioctl_list_sem);
 216
 217         return rc;
 218 }
 219 EXPORT_SYMBOL(libcfs_deregister_ioctl);
 220
 221 static int libcfs_ioctl_int(struct cfs_psdev_file *pfile,unsigned long cmd,
 222                             void *arg, struct libcfs_ioctl_data *data)
 223 {
 224         int err = -EINVAL;
 225         ENTRY;
 226
 227         switch (cmd) {
 228         case IOC_LIBCFS_CLEAR_DEBUG:
 229                 libcfs_debug_clear_buffer();
 230                 RETURN(0);
 231         /*
 232          * case IOC_LIBCFS_PANIC:
 233          * Handled in arch/cfs_module.c
 234          */
 235         case IOC_LIBCFS_MARK_DEBUG:
 236                 if (data->ioc_inlbuf1 == NULL ||
 237                     data->ioc_inlbuf1[data->ioc_inllen1 - 1] != '\0')
 238                         RETURN(-EINVAL);
 239                 libcfs_debug_mark_buffer(data->ioc_inlbuf1);
 240                 RETURN(0);
 241 #if LWT_SUPPORT
 242         case IOC_LIBCFS_LWT_CONTROL:
 243                 err = lwt_control ((data->ioc_flags & 1) != 0,
 244                                    (data->ioc_flags & 2) != 0);
 245                 break;
 246
 247         case IOC_LIBCFS_LWT_SNAPSHOT: {
 248                 cfs_cycles_t   now;
 249                 int         ncpu;
 250                 int         total_size;
 251
 252                 err = lwt_snapshot (&now, &ncpu, &total_size,
 253                                     data->ioc_pbuf1, data->ioc_plen1);
 254                 data->ioc_u64[0] = now;
 255                 data->ioc_u32[0] = ncpu;
 256                 data->ioc_u32[1] = total_size;
 257
 258                 /* Hedge against broken user/kernel typedefs (e.g. cycles_t) */
 259                 data->ioc_u32[2] = sizeof(lwt_event_t);
 260                 data->ioc_u32[3] = offsetof(lwt_event_t, lwte_where);
 261
 262                 if (err == 0 &&
 263                     libcfs_ioctl_popdata(arg, data, sizeof (*data)))
 264                         err = -EFAULT;
 265                 break;
 266         }
 267
 268         case IOC_LIBCFS_LWT_LOOKUP_STRING:
 269                 err = lwt_lookup_string (&data->ioc_count, data->ioc_pbuf1,
 270                                          data->ioc_pbuf2, data->ioc_plen2);
 271                 if (err == 0 &&
 272                     libcfs_ioctl_popdata(arg, data, sizeof (*data)))
 273                         err = -EFAULT;
 274                 break;
 275 #endif
 276         case IOC_LIBCFS_MEMHOG:
 277                 if (pfile->private_data == NULL) {
 278                         err = -EINVAL;
 279                 } else {
 280                         kportal_memhog_free(pfile->private_data);
 281                         /* XXX The ioc_flags is not GFP flags now, need to be fixed */
 282                         err = kportal_memhog_alloc(pfile->private_data,
 283                                                    data->ioc_count,
 284                                                    data->ioc_flags);
 285                         if (err != 0)
 286                                 kportal_memhog_free(pfile->private_data);
 287                 }
 288                 break;
 289
 290         case IOC_LIBCFS_PING_TEST: {
 291                 extern void (kping_client)(struct libcfs_ioctl_data *);
 292                 void (*ping)(struct libcfs_ioctl_data *);
 293
 294                 CDEBUG(D_IOCTL, "doing %d pings to nid %s (%s)\n",
 295                        data->ioc_count, libcfs_nid2str(data->ioc_nid),
 296                        libcfs_nid2str(data->ioc_nid));
 297                 ping = symbol_get(kping_client);
 298                 if (!ping)
 299                         CERROR("symbol_get failed\n");
 300                 else {
 301                         ping(data);
 302                         symbol_put(kping_client);
 303                 }
 304                 RETURN(0);
 305         }
 306
 307         default: {
 308                 struct libcfs_ioctl_handler *hand;
 309                 err = -EINVAL;
 310                 down_read(&ioctl_list_sem);
 311                 list_for_each_entry(hand, &ioctl_list, item) {
 312                         err = hand->handle_ioctl(cmd, data);
 313                         if (err != -EINVAL) {
 314                                 if (err == 0)
 315                                         err = libcfs_ioctl_popdata(arg,
 316                                                         data, sizeof (*data));
 317                                 break;
 318                         }
 319                 }
 320                 up_read(&ioctl_list_sem);
 321                 break;
 322         }
 323         }
 324
 325         RETURN(err);
 326 }
 327
 328 static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd, void *arg)
 329 {
 330         char    *buf;
 331         struct libcfs_ioctl_data *data;
 332         int err = 0;
 333         ENTRY;
 334
 335         LIBCFS_ALLOC_GFP(buf, 1024, GFP_IOFS);
 336         if (buf == NULL)
 337                 RETURN(-ENOMEM);
 338
 339         /* 'cmd' and permissions get checked in our arch-specific caller */
 340         if (libcfs_ioctl_getdata(buf, buf + 800, (void *)arg)) {
 341                 CERROR("PORTALS ioctl: data error\n");
 342                 GOTO(out, err = -EINVAL);
 343         }
 344         data = (struct libcfs_ioctl_data *)buf;
 345
 346         err = libcfs_ioctl_int(pfile, cmd, arg, data);
 347
 348 out:
 349         LIBCFS_FREE(buf, 1024);
 350         RETURN(err);
 351 }
 352
 353
 354 struct cfs_psdev_ops libcfs_psdev_ops = {
 355         libcfs_psdev_open,
 356         libcfs_psdev_release,
 357         NULL,
 358         NULL,
 359         libcfs_ioctl
 360 };
 361
 362 extern int insert_proc(void);
 363 extern void remove_proc(void);
 364 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 365 MODULE_DESCRIPTION("Portals v3.1");
 366 MODULE_LICENSE("GPL");
 367
 368 extern psdev_t libcfs_dev;
 369 extern struct rw_semaphore cfs_tracefile_sem;
 370 extern struct mutex cfs_trace_thread_mutex;
 371 extern struct cfs_wi_sched *cfs_sched_rehash;
 372
 373 extern void libcfs_init_nidstrings(void);
 374 extern int libcfs_arch_init(void);
 375 extern void libcfs_arch_cleanup(void);
 376
 377 static int init_libcfs_module(void)
 378 {
 379         int rc;
 380
 381         libcfs_arch_init();
 382         libcfs_init_nidstrings();
 383         init_rwsem(&cfs_tracefile_sem);
 384         mutex_init(&cfs_trace_thread_mutex);
 385         init_rwsem(&ioctl_list_sem);
 386         INIT_LIST_HEAD(&ioctl_list);
 387         init_waitqueue_head(&cfs_race_waitq);
 388
 389         rc = libcfs_debug_init(5 * 1024 * 1024);
 390         if (rc < 0) {
 391                 printk(KERN_ERR "LustreError: libcfs_debug_init: %d\n", rc);
 392                 return (rc);
 393         }
 394
 395         rc = cfs_cpu_init();
 396         if (rc != 0)
 397                 goto cleanup_debug;
 398
 399 #if LWT_SUPPORT
 400         rc = lwt_init();
 401         if (rc != 0) {
 402                 CERROR("lwt_init: error %d\n", rc);
 403                 goto cleanup_debug;
 404         }
 405 #endif
 406         rc = misc_register(&libcfs_dev);
 407         if (rc) {
 408                 CERROR("misc_register: error %d\n", rc);
 409                 goto cleanup_lwt;
 410         }
 411
 412         rc = cfs_wi_startup();
 413         if (rc) {
 414                 CERROR("initialize workitem: error %d\n", rc);
 415                 goto cleanup_deregister;
 416         }
 417
 418         /* max to 4 threads, should be enough for rehash */
 419         rc = min(cfs_cpt_weight(cfs_cpt_table, CFS_CPT_ANY), 4);
 420         rc = cfs_wi_sched_create("cfs_rh", cfs_cpt_table, CFS_CPT_ANY,
 421                                  rc, &cfs_sched_rehash);
 422         if (rc != 0) {
 423                 CERROR("Startup workitem scheduler: error: %d\n", rc);
 424                 goto cleanup_deregister;
 425         }
 426
 427         rc = cfs_crypto_register();
 428         if (rc) {
 429                 CERROR("cfs_crypto_regster: error %d\n", rc);
 430                 goto cleanup_wi;
 431         }
 432
 433
 434         rc = insert_proc();
 435         if (rc) {
 436                 CERROR("insert_proc: error %d\n", rc);
 437                 goto cleanup_crypto;
 438         }
 439
 440         CDEBUG (D_OTHER, "portals setup OK\n");
 441         return 0;
 442  cleanup_crypto:
 443         cfs_crypto_unregister();
 444  cleanup_wi:
 445         cfs_wi_shutdown();
 446  cleanup_deregister:
 447         misc_deregister(&libcfs_dev);
 448  cleanup_lwt:
 449 #if LWT_SUPPORT
 450         lwt_fini();
 451 #endif
 452  cleanup_debug:
 453         libcfs_debug_cleanup();
 454         return rc;
 455 }
 456
 457 static void exit_libcfs_module(void)
 458 {
 459         int rc;
 460
 461         remove_proc();
 462
 463         CDEBUG(D_MALLOC, "before Portals cleanup: kmem %d\n",
 464                atomic_read(&libcfs_kmemory));
 465
 466         if (cfs_sched_rehash != NULL) {
 467                 cfs_wi_sched_destroy(cfs_sched_rehash);
 468                 cfs_sched_rehash = NULL;
 469         }
 470
 471         cfs_crypto_unregister();
 472         cfs_wi_shutdown();
 473
 474         rc = misc_deregister(&libcfs_dev);
 475         if (rc)
 476                 CERROR("misc_deregister error %d\n", rc);
 477
 478 #if LWT_SUPPORT
 479         lwt_fini();
 480 #endif
 481         cfs_cpu_fini();
 482
 483         if (atomic_read(&libcfs_kmemory) != 0)
 484                 CERROR("Portals memory leaked: %d bytes\n",
 485                        atomic_read(&libcfs_kmemory));
 486
 487         rc = libcfs_debug_cleanup();
 488         if (rc)
 489                 printk(KERN_ERR "LustreError: libcfs_debug_cleanup: %d\n",
 490                        rc);
 491
 492         fini_rwsem(&ioctl_list_sem);
 493         fini_rwsem(&cfs_tracefile_sem);
 494
 495         libcfs_arch_cleanup();
 496 }
 497
 498 cfs_module(libcfs, "1.0.0", init_libcfs_module, exit_libcfs_module);