drivers/infiniband/hw/ipath/ipath_fs.c

   1 /*
   2  * Copyright (c) 2006, 2007 QLogic Corporation. 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         /*
 261          * Note: the chips support a maximum MTU of 4096, but the driver
 262          * hasn't implemented this feature yet, so set the maximum
 263          * to 2048.
 264          */
 265         portinfo[10] =  /* VLArbitrationLowCap is 0 (only one VL) */
 266                 /* InitTypeReply is SMA decision */
 267                 (4 << 16)       /* MTUCap 2048 */
 268                 | (7 << 13)     /* VLStallCount */
 269                 | (0x1f << 8)   /* HOQLife */
 270                 | (1 << 4)
 271
 272                 /* OperationalVLs 0 */
 273                 /* PartitionEnforcementInbound */
 274                 /* PartitionEnforcementOutbound not enforced */
 275                 /* FilterRawinbound not enforced */
 276                 ;               /* FilterRawOutbound not enforced */
 277         /* M_KeyViolations are not counted by hardware, SMA can count */
 278         tmp = ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
 279         /* P_KeyViolations are counted by hardware. */
 280         portinfo[11] = ((tmp & 0xffff) << 0);
 281         portinfo[12] =
 282                 /* Q_KeyViolations are not counted by hardware */
 283                 (1 << 8)
 284
 285                 /* GUIDCap */
 286                 /* SubnetTimeOut handled by SMA */
 287                 /* RespTimeValue handled by SMA */
 288                 ;
 289         /* LocalPhyErrors are programmed to max */
 290         portinfo[12] |= (0xf << 20)
 291                 | (0xf << 16)   /* OverRunErrors are programmed to max */
 292                 ;
 293
 294         return simple_read_from_buffer(buf, count, ppos, portinfo,
 295                                        sizeof portinfo);
 296 }
 297
 298 static const struct file_operations atomic_port_info_ops = {
 299         .read = atomic_port_info_read,
 300 };
 301
 302 static ssize_t flash_read(struct file *file, char __user *buf,
 303                           size_t count, loff_t *ppos)
 304 {
 305         struct ipath_devdata *dd;
 306         ssize_t ret;
 307         loff_t pos;
 308         char *tmp;
 309
 310         pos = *ppos;
 311
 312         if ( pos < 0) {
 313                 ret = -EINVAL;
 314                 goto bail;
 315         }
 316
 317         if (pos >= sizeof(struct ipath_flash)) {
 318                 ret = 0;
 319                 goto bail;
 320         }
 321
 322         if (count > sizeof(struct ipath_flash) - pos)
 323                 count = sizeof(struct ipath_flash) - pos;
 324
 325         tmp = kmalloc(count, GFP_KERNEL);
 326         if (!tmp) {
 327                 ret = -ENOMEM;
 328                 goto bail;
 329         }
 330
 331         dd = file->f_path.dentry->d_inode->i_private;
 332         if (ipath_eeprom_read(dd, pos, tmp, count)) {
 333                 ipath_dev_err(dd, "failed to read from flash\n");
 334                 ret = -ENXIO;
 335                 goto bail_tmp;
 336         }
 337
 338         if (copy_to_user(buf, tmp, count)) {
 339                 ret = -EFAULT;
 340                 goto bail_tmp;
 341         }
 342
 343         *ppos = pos + count;
 344         ret = count;
 345
 346 bail_tmp:
 347         kfree(tmp);
 348
 349 bail:
 350         return ret;
 351 }
 352
 353 static ssize_t flash_write(struct file *file, const char __user *buf,
 354                            size_t count, loff_t *ppos)
 355 {
 356         struct ipath_devdata *dd;
 357         ssize_t ret;
 358         loff_t pos;
 359         char *tmp;
 360
 361         pos = *ppos;
 362
 363         if (pos != 0) {
 364                 ret = -EINVAL;
 365                 goto bail;
 366         }
 367
 368         if (count != sizeof(struct ipath_flash)) {
 369                 ret = -EINVAL;
 370                 goto bail;
 371         }
 372
 373         tmp = kmalloc(count, GFP_KERNEL);
 374         if (!tmp) {
 375                 ret = -ENOMEM;
 376                 goto bail;
 377         }
 378
 379         if (copy_from_user(tmp, buf, count)) {
 380                 ret = -EFAULT;
 381                 goto bail_tmp;
 382         }
 383
 384         dd = file->f_path.dentry->d_inode->i_private;
 385         if (ipath_eeprom_write(dd, pos, tmp, count)) {
 386                 ret = -ENXIO;
 387                 ipath_dev_err(dd, "failed to write to flash\n");
 388                 goto bail_tmp;
 389         }
 390
 391         *ppos = pos + count;
 392         ret = count;
 393
 394 bail_tmp:
 395         kfree(tmp);
 396
 397 bail:
 398         return ret;
 399 }
 400
 401 static const struct file_operations flash_ops = {
 402         .read = flash_read,
 403         .write = flash_write,
 404 };
 405
 406 static int create_device_files(struct super_block *sb,
 407                                struct ipath_devdata *dd)
 408 {
 409         struct dentry *dir, *tmp;
 410         char unit[10];
 411         int ret;
 412
 413         snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
 414         ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
 415                           (struct file_operations *) &simple_dir_operations,
 416                           dd);
 417         if (ret) {
 418                 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
 419                 goto bail;
 420         }
 421
 422         ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
 423                           &atomic_counters_ops, dd);
 424         if (ret) {
 425                 printk(KERN_ERR "create_file(%s/atomic_counters) "
 426                        "failed: %d\n", unit, ret);
 427                 goto bail;
 428         }
 429
 430         ret = create_file("node_info", S_IFREG|S_IRUGO, dir, &tmp,
 431                           &atomic_node_info_ops, dd);
 432         if (ret) {
 433                 printk(KERN_ERR "create_file(%s/node_info) "
 434                        "failed: %d\n", unit, ret);
 435                 goto bail;
 436         }
 437
 438         ret = create_file("port_info", S_IFREG|S_IRUGO, dir, &tmp,
 439                           &atomic_port_info_ops, dd);
 440         if (ret) {
 441                 printk(KERN_ERR "create_file(%s/port_info) "
 442                        "failed: %d\n", unit, ret);
 443                 goto bail;
 444         }
 445
 446         ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
 447                           &flash_ops, dd);
 448         if (ret) {
 449                 printk(KERN_ERR "create_file(%s/flash) "
 450                        "failed: %d\n", unit, ret);
 451                 goto bail;
 452         }
 453
 454 bail:
 455         return ret;
 456 }
 457
 458 static int remove_file(struct dentry *parent, char *name)
 459 {
 460         struct dentry *tmp;
 461         int ret;
 462
 463         tmp = lookup_one_len(name, parent, strlen(name));
 464
 465         if (IS_ERR(tmp)) {
 466                 ret = PTR_ERR(tmp);
 467                 goto bail;
 468         }
 469
 470         spin_lock(&dcache_lock);
 471         spin_lock(&tmp->d_lock);
 472         if (!(d_unhashed(tmp) && tmp->d_inode)) {
 473                 dget_locked(tmp);
 474                 __d_drop(tmp);
 475                 spin_unlock(&tmp->d_lock);
 476                 spin_unlock(&dcache_lock);
 477                 simple_unlink(parent->d_inode, tmp);
 478         } else {
 479                 spin_unlock(&tmp->d_lock);
 480                 spin_unlock(&dcache_lock);
 481         }
 482
 483         ret = 0;
 484 bail:
 485         /*
 486          * We don't expect clients to care about the return value, but
 487          * it's there if they need it.
 488          */
 489         return ret;
 490 }
 491
 492 static int remove_device_files(struct super_block *sb,
 493                                struct ipath_devdata *dd)
 494 {
 495         struct dentry *dir, *root;
 496         char unit[10];
 497         int ret;
 498
 499         root = dget(sb->s_root);
 500         mutex_lock(&root->d_inode->i_mutex);
 501         snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
 502         dir = lookup_one_len(unit, root, strlen(unit));
 503
 504         if (IS_ERR(dir)) {
 505                 ret = PTR_ERR(dir);
 506                 printk(KERN_ERR "Lookup of %s failed\n", unit);
 507                 goto bail;
 508         }
 509
 510         remove_file(dir, "flash");
 511         remove_file(dir, "port_info");
 512         remove_file(dir, "node_info");
 513         remove_file(dir, "atomic_counters");
 514         d_delete(dir);
 515         ret = simple_rmdir(root->d_inode, dir);
 516
 517 bail:
 518         mutex_unlock(&root->d_inode->i_mutex);
 519         dput(root);
 520         return ret;
 521 }
 522
 523 static int ipathfs_fill_super(struct super_block *sb, void *data,
 524                               int silent)
 525 {
 526         struct ipath_devdata *dd, *tmp;
 527         unsigned long flags;
 528         int ret;
 529
 530         static struct tree_descr files[] = {
 531                 [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
 532                 {""},
 533         };
 534
 535         ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
 536         if (ret) {
 537                 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
 538                 goto bail;
 539         }
 540
 541         spin_lock_irqsave(&ipath_devs_lock, flags);
 542
 543         list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
 544                 spin_unlock_irqrestore(&ipath_devs_lock, flags);
 545                 ret = create_device_files(sb, dd);
 546                 if (ret) {
 547                         deactivate_super(sb);
 548                         goto bail;
 549                 }
 550                 spin_lock_irqsave(&ipath_devs_lock, flags);
 551         }
 552
 553         spin_unlock_irqrestore(&ipath_devs_lock, flags);
 554
 555 bail:
 556         return ret;
 557 }
 558
 559 static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
 560                         const char *dev_name, void *data, struct vfsmount *mnt)
 561 {
 562         int ret = get_sb_single(fs_type, flags, data,
 563                                     ipathfs_fill_super, mnt);
 564         if (ret >= 0)
 565                 ipath_super = mnt->mnt_sb;
 566         return ret;
 567 }
 568
 569 static void ipathfs_kill_super(struct super_block *s)
 570 {
 571         kill_litter_super(s);
 572         ipath_super = NULL;
 573 }
 574
 575 int ipathfs_add_device(struct ipath_devdata *dd)
 576 {
 577         int ret;
 578
 579         if (ipath_super == NULL) {
 580                 ret = 0;
 581                 goto bail;
 582         }
 583
 584         ret = create_device_files(ipath_super, dd);
 585
 586 bail:
 587         return ret;
 588 }
 589
 590 int ipathfs_remove_device(struct ipath_devdata *dd)
 591 {
 592         int ret;
 593
 594         if (ipath_super == NULL) {
 595                 ret = 0;
 596                 goto bail;
 597         }
 598
 599         ret = remove_device_files(ipath_super, dd);
 600
 601 bail:
 602         return ret;
 603 }
 604
 605 static struct file_system_type ipathfs_fs_type = {
 606         .owner =        THIS_MODULE,
 607         .name =         "ipathfs",
 608         .get_sb =       ipathfs_get_sb,
 609         .kill_sb =      ipathfs_kill_super,
 610 };
 611
 612 int __init ipath_init_ipathfs(void)
 613 {
 614         return register_filesystem(&ipathfs_fs_type);
 615 }
 616
 617 void __exit ipath_exit_ipathfs(void)
 618 {
 619         unregister_filesystem(&ipathfs_fs_type);
 620 }