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 "../../include/linux/libcfs/libcfs.h"
  40 #include "../../include/linux/libcfs/libcfs_crypto.h"
  41 #include "../../include/linux/lnet/lib-lnet.h"
  42 #include "../../include/linux/lnet/lnet.h"
  43 #include "tracefile.h"
  44
  45 static void kportal_memhog_free (struct libcfs_device_userstate *ldu)
  46 {
  47         struct page **level0p = &ldu->ldu_memhog_root_page;
  48         struct page **level1p;
  49         struct page **level2p;
  50         int        count1;
  51         int        count2;
  52
  53         if (*level0p != NULL) {
  54
  55                 level1p = (struct page **)page_address(*level0p);
  56                 count1 = 0;
  57
  58                 while (count1 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
  59                        *level1p != NULL) {
  60
  61                         level2p = (struct page **)page_address(*level1p);
  62                         count2 = 0;
  63
  64                         while (count2 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
  65                                *level2p != NULL) {
  66
  67                                 __free_page(*level2p);
  68                                 ldu->ldu_memhog_pages--;
  69                                 level2p++;
  70                                 count2++;
  71                         }
  72
  73                         __free_page(*level1p);
  74                         ldu->ldu_memhog_pages--;
  75                         level1p++;
  76                         count1++;
  77                 }
  78
  79                 __free_page(*level0p);
  80                 ldu->ldu_memhog_pages--;
  81
  82                 *level0p = NULL;
  83         }
  84
  85         LASSERT (ldu->ldu_memhog_pages == 0);
  86 }
  87
  88 static int kportal_memhog_alloc(struct libcfs_device_userstate *ldu, int npages,
  89                      gfp_t flags)
  90 {
  91         struct page **level0p;
  92         struct page **level1p;
  93         struct page **level2p;
  94         int        count1;
  95         int        count2;
  96
  97         LASSERT (ldu->ldu_memhog_pages == 0);
  98         LASSERT (ldu->ldu_memhog_root_page == NULL);
  99
 100         if (npages < 0)
 101                 return -EINVAL;
 102
 103         if (npages == 0)
 104                 return 0;
 105
 106         level0p = &ldu->ldu_memhog_root_page;
 107         *level0p = alloc_page(flags);
 108         if (*level0p == NULL)
 109                 return -ENOMEM;
 110         ldu->ldu_memhog_pages++;
 111
 112         level1p = (struct page **)page_address(*level0p);
 113         count1 = 0;
 114         memset(level1p, 0, PAGE_CACHE_SIZE);
 115
 116         while (ldu->ldu_memhog_pages < npages &&
 117                count1 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
 118
 119                 if (cfs_signal_pending())
 120                         return -EINTR;
 121
 122                 *level1p = alloc_page(flags);
 123                 if (*level1p == NULL)
 124                         return -ENOMEM;
 125                 ldu->ldu_memhog_pages++;
 126
 127                 level2p = (struct page **)page_address(*level1p);
 128                 count2 = 0;
 129                 memset(level2p, 0, PAGE_CACHE_SIZE);
 130
 131                 while (ldu->ldu_memhog_pages < npages &&
 132                        count2 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
 133
 134                         if (cfs_signal_pending())
 135                                 return -EINTR;
 136
 137                         *level2p = alloc_page(flags);
 138                         if (*level2p == NULL)
 139                                 return -ENOMEM;
 140                         ldu->ldu_memhog_pages++;
 141
 142                         level2p++;
 143                         count2++;
 144                 }
 145
 146                 level1p++;
 147                 count1++;
 148         }
 149
 150         return 0;
 151 }
 152
 153 /* called when opening /dev/device */
 154 static int libcfs_psdev_open(unsigned long flags, void *args)
 155 {
 156         struct libcfs_device_userstate *ldu;
 157
 158         try_module_get(THIS_MODULE);
 159
 160         LIBCFS_ALLOC(ldu, sizeof(*ldu));
 161         if (ldu != NULL) {
 162                 ldu->ldu_memhog_pages = 0;
 163                 ldu->ldu_memhog_root_page = NULL;
 164         }
 165         *(struct libcfs_device_userstate **)args = ldu;
 166
 167         return 0;
 168 }
 169
 170 /* called when closing /dev/device */
 171 static int libcfs_psdev_release(unsigned long flags, void *args)
 172 {
 173         struct libcfs_device_userstate *ldu;
 174
 175         ldu = (struct libcfs_device_userstate *)args;
 176         if (ldu != NULL) {
 177                 kportal_memhog_free(ldu);
 178                 LIBCFS_FREE(ldu, sizeof(*ldu));
 179         }
 180
 181         module_put(THIS_MODULE);
 182         return 0;
 183 }
 184
 185 static struct rw_semaphore ioctl_list_sem;
 186 static struct list_head ioctl_list;
 187
 188 int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand)
 189 {
 190         int rc = 0;
 191
 192         down_write(&ioctl_list_sem);
 193         if (!list_empty(&hand->item))
 194                 rc = -EBUSY;
 195         else
 196                 list_add_tail(&hand->item, &ioctl_list);
 197         up_write(&ioctl_list_sem);
 198
 199         return rc;
 200 }
 201 EXPORT_SYMBOL(libcfs_register_ioctl);
 202
 203 int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)
 204 {
 205         int rc = 0;
 206
 207         down_write(&ioctl_list_sem);
 208         if (list_empty(&hand->item))
 209                 rc = -ENOENT;
 210         else
 211                 list_del_init(&hand->item);
 212         up_write(&ioctl_list_sem);
 213
 214         return rc;
 215 }
 216 EXPORT_SYMBOL(libcfs_deregister_ioctl);
 217
 218 static int libcfs_ioctl_int(struct cfs_psdev_file *pfile, unsigned long cmd,
 219                             void *arg, struct libcfs_ioctl_data *data)
 220 {
 221         int err = -EINVAL;
 222
 223         switch (cmd) {
 224         case IOC_LIBCFS_CLEAR_DEBUG:
 225                 libcfs_debug_clear_buffer();
 226                 return 0;
 227         /*
 228          * case IOC_LIBCFS_PANIC:
 229          * Handled in arch/cfs_module.c
 230          */
 231         case IOC_LIBCFS_MARK_DEBUG:
 232                 if (data->ioc_inlbuf1 == NULL ||
 233                     data->ioc_inlbuf1[data->ioc_inllen1 - 1] != '\0')
 234                         return -EINVAL;
 235                 libcfs_debug_mark_buffer(data->ioc_inlbuf1);
 236                 return 0;
 237         case IOC_LIBCFS_MEMHOG:
 238                 if (pfile->private_data == NULL) {
 239                         err = -EINVAL;
 240                 } else {
 241                         kportal_memhog_free(pfile->private_data);
 242                         /* XXX The ioc_flags is not GFP flags now, need to be fixed */
 243                         err = kportal_memhog_alloc(pfile->private_data,
 244                                                    data->ioc_count,
 245                                                    data->ioc_flags);
 246                         if (err != 0)
 247                                 kportal_memhog_free(pfile->private_data);
 248                 }
 249                 break;
 250
 251         case IOC_LIBCFS_PING_TEST: {
 252                 extern void (kping_client)(struct libcfs_ioctl_data *);
 253                 void (*ping)(struct libcfs_ioctl_data *);
 254
 255                 CDEBUG(D_IOCTL, "doing %d pings to nid %s (%s)\n",
 256                        data->ioc_count, libcfs_nid2str(data->ioc_nid),
 257                        libcfs_nid2str(data->ioc_nid));
 258                 ping = symbol_get(kping_client);
 259                 if (!ping)
 260                         CERROR("symbol_get failed\n");
 261                 else {
 262                         ping(data);
 263                         symbol_put(kping_client);
 264                 }
 265                 return 0;
 266         }
 267
 268         default: {
 269                 struct libcfs_ioctl_handler *hand;
 270                 err = -EINVAL;
 271                 down_read(&ioctl_list_sem);
 272                 list_for_each_entry(hand, &ioctl_list, item) {
 273                         err = hand->handle_ioctl(cmd, data);
 274                         if (err != -EINVAL) {
 275                                 if (err == 0)
 276                                         err = libcfs_ioctl_popdata(arg,
 277                                                         data, sizeof (*data));
 278                                 break;
 279                         }
 280                 }
 281                 up_read(&ioctl_list_sem);
 282                 break;
 283         }
 284         }
 285
 286         return err;
 287 }
 288
 289 static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd, void *arg)
 290 {
 291         char    *buf;
 292         struct libcfs_ioctl_data *data;
 293         int err = 0;
 294
 295         LIBCFS_ALLOC_GFP(buf, 1024, GFP_IOFS);
 296         if (buf == NULL)
 297                 return -ENOMEM;
 298
 299         /* 'cmd' and permissions get checked in our arch-specific caller */
 300         if (libcfs_ioctl_getdata(buf, buf + 800, (void *)arg)) {
 301                 CERROR("PORTALS ioctl: data error\n");
 302                 err = -EINVAL;
 303                 goto out;
 304         }
 305         data = (struct libcfs_ioctl_data *)buf;
 306
 307         err = libcfs_ioctl_int(pfile, cmd, arg, data);
 308
 309 out:
 310         LIBCFS_FREE(buf, 1024);
 311         return err;
 312 }
 313
 314
 315 struct cfs_psdev_ops libcfs_psdev_ops = {
 316         libcfs_psdev_open,
 317         libcfs_psdev_release,
 318         NULL,
 319         NULL,
 320         libcfs_ioctl
 321 };
 322
 323 extern int insert_proc(void);
 324 extern void remove_proc(void);
 325 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 326 MODULE_DESCRIPTION("Portals v3.1");
 327 MODULE_LICENSE("GPL");
 328
 329 extern struct miscdevice libcfs_dev;
 330 extern struct rw_semaphore cfs_tracefile_sem;
 331 extern struct mutex cfs_trace_thread_mutex;
 332 extern struct cfs_wi_sched *cfs_sched_rehash;
 333
 334 extern void libcfs_init_nidstrings(void);
 335 extern int libcfs_arch_init(void);
 336 extern void libcfs_arch_cleanup(void);
 337
 338 static int init_libcfs_module(void)
 339 {
 340         int rc;
 341
 342         libcfs_arch_init();
 343         libcfs_init_nidstrings();
 344         init_rwsem(&cfs_tracefile_sem);
 345         mutex_init(&cfs_trace_thread_mutex);
 346         init_rwsem(&ioctl_list_sem);
 347         INIT_LIST_HEAD(&ioctl_list);
 348         init_waitqueue_head(&cfs_race_waitq);
 349
 350         rc = libcfs_debug_init(5 * 1024 * 1024);
 351         if (rc < 0) {
 352                 printk(KERN_ERR "LustreError: libcfs_debug_init: %d\n", rc);
 353                 return rc;
 354         }
 355
 356         rc = cfs_cpu_init();
 357         if (rc != 0)
 358                 goto cleanup_debug;
 359
 360         rc = misc_register(&libcfs_dev);
 361         if (rc) {
 362                 CERROR("misc_register: error %d\n", rc);
 363                 goto cleanup_cpu;
 364         }
 365
 366         rc = cfs_wi_startup();
 367         if (rc) {
 368                 CERROR("initialize workitem: error %d\n", rc);
 369                 goto cleanup_deregister;
 370         }
 371
 372         /* max to 4 threads, should be enough for rehash */
 373         rc = min(cfs_cpt_weight(cfs_cpt_table, CFS_CPT_ANY), 4);
 374         rc = cfs_wi_sched_create("cfs_rh", cfs_cpt_table, CFS_CPT_ANY,
 375                                  rc, &cfs_sched_rehash);
 376         if (rc != 0) {
 377                 CERROR("Startup workitem scheduler: error: %d\n", rc);
 378                 goto cleanup_deregister;
 379         }
 380
 381         rc = cfs_crypto_register();
 382         if (rc) {
 383                 CERROR("cfs_crypto_register: error %d\n", rc);
 384                 goto cleanup_wi;
 385         }
 386
 387
 388         rc = insert_proc();
 389         if (rc) {
 390                 CERROR("insert_proc: error %d\n", rc);
 391                 goto cleanup_crypto;
 392         }
 393
 394         CDEBUG (D_OTHER, "portals setup OK\n");
 395         return 0;
 396  cleanup_crypto:
 397         cfs_crypto_unregister();
 398  cleanup_wi:
 399         cfs_wi_shutdown();
 400  cleanup_deregister:
 401         misc_deregister(&libcfs_dev);
 402 cleanup_cpu:
 403         cfs_cpu_fini();
 404  cleanup_debug:
 405         libcfs_debug_cleanup();
 406         return rc;
 407 }
 408
 409 static void exit_libcfs_module(void)
 410 {
 411         int rc;
 412
 413         remove_proc();
 414
 415         CDEBUG(D_MALLOC, "before Portals cleanup: kmem %d\n",
 416                atomic_read(&libcfs_kmemory));
 417
 418         if (cfs_sched_rehash != NULL) {
 419                 cfs_wi_sched_destroy(cfs_sched_rehash);
 420                 cfs_sched_rehash = NULL;
 421         }
 422
 423         cfs_crypto_unregister();
 424         cfs_wi_shutdown();
 425
 426         rc = misc_deregister(&libcfs_dev);
 427         if (rc)
 428                 CERROR("misc_deregister error %d\n", rc);
 429
 430         cfs_cpu_fini();
 431
 432         if (atomic_read(&libcfs_kmemory) != 0)
 433                 CERROR("Portals memory leaked: %d bytes\n",
 434                        atomic_read(&libcfs_kmemory));
 435
 436         rc = libcfs_debug_cleanup();
 437         if (rc)
 438                 printk(KERN_ERR "LustreError: libcfs_debug_cleanup: %d\n",
 439                        rc);
 440
 441         libcfs_arch_cleanup();
 442 }
 443
 444 MODULE_VERSION("1.0.0");
 445 module_init(init_libcfs_module);
 446 module_exit(exit_libcfs_module);