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