git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/hw/ipath/ipath_fs.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
   3  * Copyright (c) 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/version.h>
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/mount.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/init.h>
  40 #include <linux/namei.h>
  41
  42 #include "ipath_kernel.h"
  43
  44 #define IPATHFS_MAGIC 0x726a77
  45
  46 static struct super_block *ipath_super;
  47
  48 static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
  49                          int mode, const struct file_operations *fops,
  50                          void *data)
  51 {
  52         int error;
  53         struct inode *inode = new_inode(dir->i_sb);
  54
  55         if (!inode) {
  56                 error = -EPERM;
  57                 goto bail;
  58         }
  59
  60         inode->i_mode = mode;
  61         inode->i_uid = 0;
  62         inode->i_gid = 0;
  63         inode->i_blocks = 0;
  64         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
  65         inode->i_private = data;
  66         if ((mode & S_IFMT) == S_IFDIR) {
  67                 inode->i_op = &simple_dir_inode_operations;
  68                 inc_nlink(inode);
  69                 inc_nlink(dir);
  70         }
  71
  72         inode->i_fop = fops;
  73
  74         d_instantiate(dentry, inode);
  75         error = 0;
  76
  77 bail:
  78         return error;
  79 }
  80
  81 static int create_file(const char *name, mode_t mode,
  82                        struct dentry *parent, struct dentry **dentry,
  83                        const struct file_operations *fops, void *data)
  84 {
  85         int error;
  86
  87         *dentry = NULL;
  88         mutex_lock(&parent->d_inode->i_mutex);
  89         *dentry = lookup_one_len(name, parent, strlen(name));
  90         if (!IS_ERR(dentry))
  91                 error = ipathfs_mknod(parent->d_inode, *dentry,
  92                                       mode, fops, data);
  93         else
  94                 error = PTR_ERR(dentry);
  95         mutex_unlock(&parent->d_inode->i_mutex);
  96
  97         return error;
  98 }
  99
 100 static ssize_t atomic_stats_read(struct file *file, char __user *buf,
 101                                  size_t count, loff_t *ppos)
 102 {
 103         return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
 104                                        sizeof ipath_stats);
 105 }
 106
 107 static const struct file_operations atomic_stats_ops = {
 108         .read = atomic_stats_read,
 109 };
 110
 111 #define NUM_COUNTERS sizeof(struct infinipath_counters) / sizeof(u64)
 112
 113 static ssize_t atomic_counters_read(struct file *file, char __user *buf,
 114                                     size_t count, loff_t *ppos)
 115 {
 116         u64 counters[NUM_COUNTERS];
 117         u16 i;
 118         struct ipath_devdata *dd;
 119
 120         dd = file->f_path.dentry->d_inode->i_private;
 121
 122         for (i = 0; i < NUM_COUNTERS; i++)
 123                 counters[i] = ipath_snap_cntr(dd, i);
 124
 125         return simple_read_from_buffer(buf, count, ppos, counters,
 126                                        sizeof counters);
 127 }
 128
 129 static const struct file_operations atomic_counters_ops = {
 130         .read = atomic_counters_read,
 131 };
 132
 133 static ssize_t atomic_node_info_read(struct file *file, char __user *buf,
 134                                      size_t count, loff_t *ppos)
 135 {
 136         u32 nodeinfo[10];
 137         struct ipath_devdata *dd;
 138         u64 guid;
 139
 140         dd = file->f_path.dentry->d_inode->i_private;
 141
 142         guid = be64_to_cpu(dd->ipath_guid);
 143
 144         nodeinfo[0] =                   /* BaseVersion is SMA */
 145                 /* ClassVersion is SMA */
 146                 (1 << 8)                /* NodeType  */
 147                 | (1 << 0);             /* NumPorts */
 148         nodeinfo[1] = (u32) (guid >> 32);
 149         nodeinfo[2] = (u32) (guid & 0xffffffff);
 150         /* PortGUID == SystemImageGUID for us */
 151         nodeinfo[3] = nodeinfo[1];
 152         /* PortGUID == SystemImageGUID for us */
 153         nodeinfo[4] = nodeinfo[2];
 154         /* PortGUID == NodeGUID for us */
 155         nodeinfo[5] = nodeinfo[3];
 156         /* PortGUID == NodeGUID for us */
 157         nodeinfo[6] = nodeinfo[4];
 158         nodeinfo[7] = (4 << 16) /* we support 4 pkeys */
 159                 | (dd->ipath_deviceid << 0);
 160         /* our chip version as 16 bits major, 16 bits minor */
 161         nodeinfo[8] = dd->ipath_minrev | (dd->ipath_majrev << 16);
 162         nodeinfo[9] = (dd->ipath_unit << 24) | (dd->ipath_vendorid << 0);
 163
 164         return simple_read_from_buffer(buf, count, ppos, nodeinfo,
 165                                        sizeof nodeinfo);
 166 }
 167
 168 static const struct file_operations atomic_node_info_ops = {
 169         .read = atomic_node_info_read,
 170 };
 171
 172 static ssize_t atomic_port_info_read(struct file *file, char __user *buf,
 173                                      size_t count, loff_t *ppos)
 174 {
 175         u32 portinfo[13];
 176         u32 tmp, tmp2;
 177         struct ipath_devdata *dd;
 178
 179         dd = file->f_path.dentry->d_inode->i_private;
 180
 181         /* so we only initialize non-zero fields. */
 182         memset(portinfo, 0, sizeof portinfo);
 183
 184         /*
 185          * Notimpl yet M_Key (64)
 186          * Notimpl yet GID (64)
 187          */
 188
 189         portinfo[4] = (dd->ipath_lid << 16);
 190
 191         /*
 192          * Notimpl yet SMLID.
 193          * CapabilityMask is 0, we don't support any of these
 194          * DiagCode is 0; we don't store any diag info for now Notimpl yet
 195          * M_KeyLeasePeriod (we don't support M_Key)
 196          */
 197
 198         /* LocalPortNum is whichever port number they ask for */
 199         portinfo[7] = (dd->ipath_unit << 24)
 200                 /* LinkWidthEnabled */
 201                 | (2 << 16)
 202                 /* LinkWidthSupported (really 2, but not IB valid) */
 203                 | (3 << 8)
 204                 /* LinkWidthActive */
 205                 | (2 << 0);
 206         tmp = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
 207         tmp2 = 5;
 208         if (tmp == IPATH_IBSTATE_INIT)
 209                 tmp = 2;
 210         else if (tmp == IPATH_IBSTATE_ARM)
 211                 tmp = 3;
 212         else if (tmp == IPATH_IBSTATE_ACTIVE)
 213                 tmp = 4;
 214         else {
 215                 tmp = 0;        /* down */
 216                 tmp2 = tmp & 0xf;
 217         }
 218
 219         portinfo[8] = (1 << 28) /* LinkSpeedSupported */
 220                 | (tmp << 24)   /* PortState */
 221                 | (tmp2 << 20)  /* PortPhysicalState */
 222                 | (2 << 16)
 223
 224                 /* LinkDownDefaultState */
 225                 /* M_KeyProtectBits == 0 */
 226                 /* NotImpl yet LMC == 0 (we can support all values) */
 227                 | (1 << 4)      /* LinkSpeedActive */
 228                 | (1 << 0);     /* LinkSpeedEnabled */
 229         switch (dd->ipath_ibmtu) {
 230         case 4096:
 231                 tmp = 5;
 232                 break;
 233         case 2048:
 234                 tmp = 4;
 235                 break;
 236         case 1024:
 237                 tmp = 3;
 238                 break;
 239         case 512:
 240                 tmp = 2;
 241                 break;
 242         case 256:
 243                 tmp = 1;
 244                 break;
 245         default:                /* oops, something is wrong */
 246                 ipath_dbg("Problem, ipath_ibmtu 0x%x not a valid IB MTU, "
 247                           "treat as 2048\n", dd->ipath_ibmtu);
 248                 tmp = 4;
 249                 break;
 250         }
 251         portinfo[9] = (tmp << 28)
 252                 /* NeighborMTU */
 253                 /* Notimpl MasterSMSL */
 254                 | (1 << 20)
 255
 256                 /* VLCap */
 257                 /* Notimpl InitType (actually, an SMA decision) */
 258                 /* VLHighLimit is 0 (only one VL) */
 259                 ; /* VLArbitrationHighCap is 0 (only one VL) */
 260         portinfo[10] =  /* VLArbitrationLowCap is 0 (only one VL) */
 261                 /* InitTypeReply is SMA decision */
 262                 (5 << 16)       /* MTUCap 4096 */
 263                 | (7 << 13)     /* VLStallCount */
 264                 | (0x1f << 8)   /* HOQLife */
 265                 | (1 << 4)
 266
 267                 /* OperationalVLs 0 */
 268                 /* PartitionEnforcementInbound */
 269                 /* PartitionEnforcementOutbound not enforced */
 270                 /* FilterRawinbound not enforced */
 271                 ;               /* FilterRawOutbound not enforced */
 272         /* M_KeyViolations are not counted by hardware, SMA can count */
 273         tmp = ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
 274         /* P_KeyViolations are counted by hardware. */
 275         portinfo[11] = ((tmp & 0xffff) << 0);
 276         portinfo[12] =
 277                 /* Q_KeyViolations are not counted by hardware */
 278                 (1 << 8)
 279
 280                 /* GUIDCap */
 281                 /* SubnetTimeOut handled by SMA */
 282                 /* RespTimeValue handled by SMA */
 283                 ;
 284         /* LocalPhyErrors are programmed to max */
 285         portinfo[12] |= (0xf << 20)
 286                 | (0xf << 16)   /* OverRunErrors are programmed to max */
 287                 ;
 288
 289         return simple_read_from_buffer(buf, count, ppos, portinfo,
 290                                        sizeof portinfo);
 291 }
 292
 293 static const struct file_operations atomic_port_info_ops = {
 294         .read = atomic_port_info_read,
 295 };
 296
 297 static ssize_t flash_read(struct file *file, char __user *buf,
 298                           size_t count, loff_t *ppos)
 299 {
 300         struct ipath_devdata *dd;
 301         ssize_t ret;
 302         loff_t pos;
 303         char *tmp;
 304
 305         pos = *ppos;
 306
 307         if ( pos < 0) {
 308                 ret = -EINVAL;
 309                 goto bail;
 310         }
 311
 312         if (pos >= sizeof(struct ipath_flash)) {
 313                 ret = 0;
 314                 goto bail;
 315         }
 316
 317         if (count > sizeof(struct ipath_flash) - pos)
 318                 count = sizeof(struct ipath_flash) - pos;
 319
 320         tmp = kmalloc(count, GFP_KERNEL);
 321         if (!tmp) {
 322                 ret = -ENOMEM;
 323                 goto bail;
 324         }
 325
 326         dd = file->f_path.dentry->d_inode->i_private;
 327         if (ipath_eeprom_read(dd, pos, tmp, count)) {
 328                 ipath_dev_err(dd, "failed to read from flash\n");
 329                 ret = -ENXIO;
 330                 goto bail_tmp;
 331         }
 332
 333         if (copy_to_user(buf, tmp, count)) {
 334                 ret = -EFAULT;
 335                 goto bail_tmp;
 336         }
 337
 338         *ppos = pos + count;
 339         ret = count;
 340
 341 bail_tmp:
 342         kfree(tmp);
 343
 344 bail:
 345         return ret;
 346 }
 347
 348 static ssize_t flash_write(struct file *file, const char __user *buf,
 349                            size_t count, loff_t *ppos)
 350 {
 351         struct ipath_devdata *dd;
 352         ssize_t ret;
 353         loff_t pos;
 354         char *tmp;
 355
 356         pos = *ppos;
 357
 358         if (pos != 0) {
 359                 ret = -EINVAL;
 360                 goto bail;
 361         }
 362
 363         if (count != sizeof(struct ipath_flash)) {
 364                 ret = -EINVAL;
 365                 goto bail;
 366         }
 367
 368         tmp = kmalloc(count, GFP_KERNEL);
 369         if (!tmp) {
 370                 ret = -ENOMEM;
 371                 goto bail;
 372         }
 373
 374         if (copy_from_user(tmp, buf, count)) {
 375                 ret = -EFAULT;
 376                 goto bail_tmp;
 377         }
 378
 379         dd = file->f_path.dentry->d_inode->i_private;
 380         if (ipath_eeprom_write(dd, pos, tmp, count)) {
 381                 ret = -ENXIO;
 382                 ipath_dev_err(dd, "failed to write to flash\n");
 383                 goto bail_tmp;
 384         }
 385
 386         *ppos = pos + count;
 387         ret = count;
 388
 389 bail_tmp:
 390         kfree(tmp);
 391
 392 bail:
 393         return ret;
 394 }
 395
 396 static const struct file_operations flash_ops = {
 397         .read = flash_read,
 398         .write = flash_write,
 399 };
 400
 401 static int create_device_files(struct super_block *sb,
 402                                struct ipath_devdata *dd)
 403 {
 404         struct dentry *dir, *tmp;
 405         char unit[10];
 406         int ret;
 407
 408         snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
 409         ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
 410                           (struct file_operations *) &simple_dir_operations,
 411                           dd);
 412         if (ret) {
 413                 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
 414                 goto bail;
 415         }
 416
 417         ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
 418                           &atomic_counters_ops, dd);
 419         if (ret) {
 420                 printk(KERN_ERR "create_file(%s/atomic_counters) "
 421                        "failed: %d\n", unit, ret);
 422                 goto bail;
 423         }
 424
 425         ret = create_file("node_info", S_IFREG|S_IRUGO, dir, &tmp,
 426                           &atomic_node_info_ops, dd);
 427         if (ret) {
 428                 printk(KERN_ERR "create_file(%s/node_info) "
 429                        "failed: %d\n", unit, ret);
 430                 goto bail;
 431         }
 432
 433         ret = create_file("port_info", S_IFREG|S_IRUGO, dir, &tmp,
 434                           &atomic_port_info_ops, dd);
 435         if (ret) {
 436                 printk(KERN_ERR "create_file(%s/port_info) "
 437                        "failed: %d\n", unit, ret);
 438                 goto bail;
 439         }
 440
 441         ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
 442                           &flash_ops, dd);
 443         if (ret) {
 444                 printk(KERN_ERR "create_file(%s/flash) "
 445                        "failed: %d\n", unit, ret);
 446                 goto bail;
 447         }
 448
 449 bail:
 450         return ret;
 451 }
 452
 453 static int remove_file(struct dentry *parent, char *name)
 454 {
 455         struct dentry *tmp;
 456         int ret;
 457
 458         tmp = lookup_one_len(name, parent, strlen(name));
 459
 460         if (IS_ERR(tmp)) {
 461                 ret = PTR_ERR(tmp);
 462                 goto bail;
 463         }
 464
 465         spin_lock(&dcache_lock);
 466         spin_lock(&tmp->d_lock);
 467         if (!(d_unhashed(tmp) && tmp->d_inode)) {
 468                 dget_locked(tmp);
 469                 __d_drop(tmp);
 470                 spin_unlock(&tmp->d_lock);
 471                 spin_unlock(&dcache_lock);
 472                 simple_unlink(parent->d_inode, tmp);
 473         } else {
 474                 spin_unlock(&tmp->d_lock);
 475                 spin_unlock(&dcache_lock);
 476         }
 477
 478         ret = 0;
 479 bail:
 480         /*
 481          * We don't expect clients to care about the return value, but
 482          * it's there if they need it.
 483          */
 484         return ret;
 485 }
 486
 487 static int remove_device_files(struct super_block *sb,
 488                                struct ipath_devdata *dd)
 489 {
 490         struct dentry *dir, *root;
 491         char unit[10];
 492         int ret;
 493
 494         root = dget(sb->s_root);
 495         mutex_lock(&root->d_inode->i_mutex);
 496         snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
 497         dir = lookup_one_len(unit, root, strlen(unit));
 498
 499         if (IS_ERR(dir)) {
 500                 ret = PTR_ERR(dir);
 501                 printk(KERN_ERR "Lookup of %s failed\n", unit);
 502                 goto bail;
 503         }
 504
 505         remove_file(dir, "flash");
 506         remove_file(dir, "port_info");
 507         remove_file(dir, "node_info");
 508         remove_file(dir, "atomic_counters");
 509         d_delete(dir);
 510         ret = simple_rmdir(root->d_inode, dir);
 511
 512 bail:
 513         mutex_unlock(&root->d_inode->i_mutex);
 514         dput(root);
 515         return ret;
 516 }
 517
 518 static int ipathfs_fill_super(struct super_block *sb, void *data,
 519                               int silent)
 520 {
 521         struct ipath_devdata *dd, *tmp;
 522         unsigned long flags;
 523         int ret;
 524
 525         static struct tree_descr files[] = {
 526                 [1] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
 527                 {""},
 528         };
 529
 530         ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
 531         if (ret) {
 532                 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
 533                 goto bail;
 534         }
 535
 536         spin_lock_irqsave(&ipath_devs_lock, flags);
 537
 538         list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
 539                 spin_unlock_irqrestore(&ipath_devs_lock, flags);
 540                 ret = create_device_files(sb, dd);
 541                 if (ret) {
 542                         deactivate_super(sb);
 543                         goto bail;
 544                 }
 545                 spin_lock_irqsave(&ipath_devs_lock, flags);
 546         }
 547
 548         spin_unlock_irqrestore(&ipath_devs_lock, flags);
 549
 550 bail:
 551         return ret;
 552 }
 553
 554 static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
 555                         const char *dev_name, void *data, struct vfsmount *mnt)
 556 {
 557         int ret = get_sb_single(fs_type, flags, data,
 558                                     ipathfs_fill_super, mnt);
 559         if (ret >= 0)
 560                 ipath_super = mnt->mnt_sb;
 561         return ret;
 562 }
 563
 564 static void ipathfs_kill_super(struct super_block *s)
 565 {
 566         kill_litter_super(s);
 567         ipath_super = NULL;
 568 }
 569
 570 int ipathfs_add_device(struct ipath_devdata *dd)
 571 {
 572         int ret;
 573
 574         if (ipath_super == NULL) {
 575                 ret = 0;
 576                 goto bail;
 577         }
 578
 579         ret = create_device_files(ipath_super, dd);
 580
 581 bail:
 582         return ret;
 583 }
 584
 585 int ipathfs_remove_device(struct ipath_devdata *dd)
 586 {
 587         int ret;
 588
 589         if (ipath_super == NULL) {
 590                 ret = 0;
 591                 goto bail;
 592         }
 593
 594         ret = remove_device_files(ipath_super, dd);
 595
 596 bail:
 597         return ret;
 598 }
 599
 600 static struct file_system_type ipathfs_fs_type = {
 601         .owner =        THIS_MODULE,
 602         .name =         "ipathfs",
 603         .get_sb =       ipathfs_get_sb,
 604         .kill_sb =      ipathfs_kill_super,
 605 };
 606
 607 int __init ipath_init_ipathfs(void)
 608 {
 609         return register_filesystem(&ipathfs_fs_type);
 610 }
 611
 612 void __exit ipath_exit_ipathfs(void)
 613 {
 614         unregister_filesystem(&ipathfs_fs_type);
 615 }