drivers/infiniband/hw/qib/qib_fs.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008, 2009 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/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/mount.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/init.h>
  39 #include <linux/namei.h>
  40
  41 #include "qib.h"
  42
  43 #define QIBFS_MAGIC 0x726a77
  44
  45 static struct super_block *qib_super;
  46
  47 #define private2dd(file) ((file)->f_dentry->d_inode->i_private)
  48
  49 static int qibfs_mknod(struct inode *dir, struct dentry *dentry,
  50                        umode_t mode, const 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_ino = get_next_ino();
  62         inode->i_mode = mode;
  63         inode->i_uid = 0;
  64         inode->i_gid = 0;
  65         inode->i_blocks = 0;
  66         inode->i_atime = CURRENT_TIME;
  67         inode->i_mtime = inode->i_atime;
  68         inode->i_ctime = inode->i_atime;
  69         inode->i_private = data;
  70         if (S_ISDIR(mode)) {
  71                 inode->i_op = &simple_dir_inode_operations;
  72                 inc_nlink(inode);
  73                 inc_nlink(dir);
  74         }
  75
  76         inode->i_fop = fops;
  77
  78         d_instantiate(dentry, inode);
  79         error = 0;
  80
  81 bail:
  82         return error;
  83 }
  84
  85 static int create_file(const char *name, umode_t mode,
  86                        struct dentry *parent, struct dentry **dentry,
  87                        const struct file_operations *fops, void *data)
  88 {
  89         int error;
  90
  91         *dentry = NULL;
  92         mutex_lock(&parent->d_inode->i_mutex);
  93         *dentry = lookup_one_len(name, parent, strlen(name));
  94         if (!IS_ERR(*dentry))
  95                 error = qibfs_mknod(parent->d_inode, *dentry,
  96                                     mode, fops, data);
  97         else
  98                 error = PTR_ERR(*dentry);
  99         mutex_unlock(&parent->d_inode->i_mutex);
 100
 101         return error;
 102 }
 103
 104 static ssize_t driver_stats_read(struct file *file, char __user *buf,
 105                                  size_t count, loff_t *ppos)
 106 {
 107         return simple_read_from_buffer(buf, count, ppos, &qib_stats,
 108                                        sizeof qib_stats);
 109 }
 110
 111 /*
 112  * driver stats field names, one line per stat, single string.  Used by
 113  * programs like ipathstats to print the stats in a way which works for
 114  * different versions of drivers, without changing program source.
 115  * if qlogic_ib_stats changes, this needs to change.  Names need to be
 116  * 12 chars or less (w/o newline), for proper display by ipathstats utility.
 117  */
 118 static const char qib_statnames[] =
 119         "KernIntr\n"
 120         "ErrorIntr\n"
 121         "Tx_Errs\n"
 122         "Rcv_Errs\n"
 123         "H/W_Errs\n"
 124         "NoPIOBufs\n"
 125         "CtxtsOpen\n"
 126         "RcvLen_Errs\n"
 127         "EgrBufFull\n"
 128         "EgrHdrFull\n"
 129         ;
 130
 131 static ssize_t driver_names_read(struct file *file, char __user *buf,
 132                                  size_t count, loff_t *ppos)
 133 {
 134         return simple_read_from_buffer(buf, count, ppos, qib_statnames,
 135                 sizeof qib_statnames - 1); /* no null */
 136 }
 137
 138 static const struct file_operations driver_ops[] = {
 139         { .read = driver_stats_read, .llseek = generic_file_llseek, },
 140         { .read = driver_names_read, .llseek = generic_file_llseek, },
 141 };
 142
 143 /* read the per-device counters */
 144 static ssize_t dev_counters_read(struct file *file, char __user *buf,
 145                                  size_t count, loff_t *ppos)
 146 {
 147         u64 *counters;
 148         size_t avail;
 149         struct qib_devdata *dd = private2dd(file);
 150
 151         avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
 152         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 153 }
 154
 155 /* read the per-device counters */
 156 static ssize_t dev_names_read(struct file *file, char __user *buf,
 157                               size_t count, loff_t *ppos)
 158 {
 159         char *names;
 160         size_t avail;
 161         struct qib_devdata *dd = private2dd(file);
 162
 163         avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
 164         return simple_read_from_buffer(buf, count, ppos, names, avail);
 165 }
 166
 167 static const struct file_operations cntr_ops[] = {
 168         { .read = dev_counters_read, .llseek = generic_file_llseek, },
 169         { .read = dev_names_read, .llseek = generic_file_llseek, },
 170 };
 171
 172 /*
 173  * Could use file->f_dentry->d_inode->i_ino to figure out which file,
 174  * instead of separate routine for each, but for now, this works...
 175  */
 176
 177 /* read the per-port names (same for each port) */
 178 static ssize_t portnames_read(struct file *file, char __user *buf,
 179                               size_t count, loff_t *ppos)
 180 {
 181         char *names;
 182         size_t avail;
 183         struct qib_devdata *dd = private2dd(file);
 184
 185         avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
 186         return simple_read_from_buffer(buf, count, ppos, names, avail);
 187 }
 188
 189 /* read the per-port counters for port 1 (pidx 0) */
 190 static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
 191                                 size_t count, loff_t *ppos)
 192 {
 193         u64 *counters;
 194         size_t avail;
 195         struct qib_devdata *dd = private2dd(file);
 196
 197         avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
 198         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 199 }
 200
 201 /* read the per-port counters for port 2 (pidx 1) */
 202 static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
 203                                 size_t count, loff_t *ppos)
 204 {
 205         u64 *counters;
 206         size_t avail;
 207         struct qib_devdata *dd = private2dd(file);
 208
 209         avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
 210         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 211 }
 212
 213 static const struct file_operations portcntr_ops[] = {
 214         { .read = portnames_read, .llseek = generic_file_llseek, },
 215         { .read = portcntrs_1_read, .llseek = generic_file_llseek, },
 216         { .read = portcntrs_2_read, .llseek = generic_file_llseek, },
 217 };
 218
 219 /*
 220  * read the per-port QSFP data for port 1 (pidx 0)
 221  */
 222 static ssize_t qsfp_1_read(struct file *file, char __user *buf,
 223                            size_t count, loff_t *ppos)
 224 {
 225         struct qib_devdata *dd = private2dd(file);
 226         char *tmp;
 227         int ret;
 228
 229         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 230         if (!tmp)
 231                 return -ENOMEM;
 232
 233         ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
 234         if (ret > 0)
 235                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 236         kfree(tmp);
 237         return ret;
 238 }
 239
 240 /*
 241  * read the per-port QSFP data for port 2 (pidx 1)
 242  */
 243 static ssize_t qsfp_2_read(struct file *file, char __user *buf,
 244                            size_t count, loff_t *ppos)
 245 {
 246         struct qib_devdata *dd = private2dd(file);
 247         char *tmp;
 248         int ret;
 249
 250         if (dd->num_pports < 2)
 251                 return -ENODEV;
 252
 253         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 254         if (!tmp)
 255                 return -ENOMEM;
 256
 257         ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
 258         if (ret > 0)
 259                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 260         kfree(tmp);
 261         return ret;
 262 }
 263
 264 static const struct file_operations qsfp_ops[] = {
 265         { .read = qsfp_1_read, .llseek = generic_file_llseek, },
 266         { .read = qsfp_2_read, .llseek = generic_file_llseek, },
 267 };
 268
 269 static ssize_t flash_read(struct file *file, char __user *buf,
 270                           size_t count, loff_t *ppos)
 271 {
 272         struct qib_devdata *dd;
 273         ssize_t ret;
 274         loff_t pos;
 275         char *tmp;
 276
 277         pos = *ppos;
 278
 279         if (pos < 0) {
 280                 ret = -EINVAL;
 281                 goto bail;
 282         }
 283
 284         if (pos >= sizeof(struct qib_flash)) {
 285                 ret = 0;
 286                 goto bail;
 287         }
 288
 289         if (count > sizeof(struct qib_flash) - pos)
 290                 count = sizeof(struct qib_flash) - pos;
 291
 292         tmp = kmalloc(count, GFP_KERNEL);
 293         if (!tmp) {
 294                 ret = -ENOMEM;
 295                 goto bail;
 296         }
 297
 298         dd = private2dd(file);
 299         if (qib_eeprom_read(dd, pos, tmp, count)) {
 300                 qib_dev_err(dd, "failed to read from flash\n");
 301                 ret = -ENXIO;
 302                 goto bail_tmp;
 303         }
 304
 305         if (copy_to_user(buf, tmp, count)) {
 306                 ret = -EFAULT;
 307                 goto bail_tmp;
 308         }
 309
 310         *ppos = pos + count;
 311         ret = count;
 312
 313 bail_tmp:
 314         kfree(tmp);
 315
 316 bail:
 317         return ret;
 318 }
 319
 320 static ssize_t flash_write(struct file *file, const char __user *buf,
 321                            size_t count, loff_t *ppos)
 322 {
 323         struct qib_devdata *dd;
 324         ssize_t ret;
 325         loff_t pos;
 326         char *tmp;
 327
 328         pos = *ppos;
 329
 330         if (pos != 0) {
 331                 ret = -EINVAL;
 332                 goto bail;
 333         }
 334
 335         if (count != sizeof(struct qib_flash)) {
 336                 ret = -EINVAL;
 337                 goto bail;
 338         }
 339
 340         tmp = kmalloc(count, GFP_KERNEL);
 341         if (!tmp) {
 342                 ret = -ENOMEM;
 343                 goto bail;
 344         }
 345
 346         if (copy_from_user(tmp, buf, count)) {
 347                 ret = -EFAULT;
 348                 goto bail_tmp;
 349         }
 350
 351         dd = private2dd(file);
 352         if (qib_eeprom_write(dd, pos, tmp, count)) {
 353                 ret = -ENXIO;
 354                 qib_dev_err(dd, "failed to write to flash\n");
 355                 goto bail_tmp;
 356         }
 357
 358         *ppos = pos + count;
 359         ret = count;
 360
 361 bail_tmp:
 362         kfree(tmp);
 363
 364 bail:
 365         return ret;
 366 }
 367
 368 static const struct file_operations flash_ops = {
 369         .read = flash_read,
 370         .write = flash_write,
 371         .llseek = default_llseek,
 372 };
 373
 374 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
 375 {
 376         struct dentry *dir, *tmp;
 377         char unit[10];
 378         int ret, i;
 379
 380         /* create the per-unit directory */
 381         snprintf(unit, sizeof unit, "%u", dd->unit);
 382         ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
 383                           &simple_dir_operations, dd);
 384         if (ret) {
 385                 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
 386                 goto bail;
 387         }
 388
 389         /* create the files in the new directory */
 390         ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
 391                           &cntr_ops[0], dd);
 392         if (ret) {
 393                 printk(KERN_ERR "create_file(%s/counters) failed: %d\n",
 394                        unit, ret);
 395                 goto bail;
 396         }
 397         ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
 398                           &cntr_ops[1], dd);
 399         if (ret) {
 400                 printk(KERN_ERR "create_file(%s/counter_names) failed: %d\n",
 401                        unit, ret);
 402                 goto bail;
 403         }
 404         ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
 405                           &portcntr_ops[0], dd);
 406         if (ret) {
 407                 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
 408                        unit, "portcounter_names", ret);
 409                 goto bail;
 410         }
 411         for (i = 1; i <= dd->num_pports; i++) {
 412                 char fname[24];
 413
 414                 sprintf(fname, "port%dcounters", i);
 415                 /* create the files in the new directory */
 416                 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
 417                                   &portcntr_ops[i], dd);
 418                 if (ret) {
 419                         printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
 420                                 unit, fname, ret);
 421                         goto bail;
 422                 }
 423                 if (!(dd->flags & QIB_HAS_QSFP))
 424                         continue;
 425                 sprintf(fname, "qsfp%d", i);
 426                 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
 427                                   &qsfp_ops[i - 1], dd);
 428                 if (ret) {
 429                         printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
 430                                 unit, fname, ret);
 431                         goto bail;
 432                 }
 433         }
 434
 435         ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
 436                           &flash_ops, dd);
 437         if (ret)
 438                 printk(KERN_ERR "create_file(%s/flash) failed: %d\n",
 439                         unit, ret);
 440 bail:
 441         return ret;
 442 }
 443
 444 static int remove_file(struct dentry *parent, char *name)
 445 {
 446         struct dentry *tmp;
 447         int ret;
 448
 449         tmp = lookup_one_len(name, parent, strlen(name));
 450
 451         if (IS_ERR(tmp)) {
 452                 ret = PTR_ERR(tmp);
 453                 goto bail;
 454         }
 455
 456         spin_lock(&tmp->d_lock);
 457         if (!(d_unhashed(tmp) && tmp->d_inode)) {
 458                 dget_dlock(tmp);
 459                 __d_drop(tmp);
 460                 spin_unlock(&tmp->d_lock);
 461                 simple_unlink(parent->d_inode, tmp);
 462         } else {
 463                 spin_unlock(&tmp->d_lock);
 464         }
 465
 466         ret = 0;
 467 bail:
 468         /*
 469          * We don't expect clients to care about the return value, but
 470          * it's there if they need it.
 471          */
 472         return ret;
 473 }
 474
 475 static int remove_device_files(struct super_block *sb,
 476                                struct qib_devdata *dd)
 477 {
 478         struct dentry *dir, *root;
 479         char unit[10];
 480         int ret, i;
 481
 482         root = dget(sb->s_root);
 483         mutex_lock(&root->d_inode->i_mutex);
 484         snprintf(unit, sizeof unit, "%u", dd->unit);
 485         dir = lookup_one_len(unit, root, strlen(unit));
 486
 487         if (IS_ERR(dir)) {
 488                 ret = PTR_ERR(dir);
 489                 printk(KERN_ERR "Lookup of %s failed\n", unit);
 490                 goto bail;
 491         }
 492
 493         remove_file(dir, "counters");
 494         remove_file(dir, "counter_names");
 495         remove_file(dir, "portcounter_names");
 496         for (i = 0; i < dd->num_pports; i++) {
 497                 char fname[24];
 498
 499                 sprintf(fname, "port%dcounters", i + 1);
 500                 remove_file(dir, fname);
 501                 if (dd->flags & QIB_HAS_QSFP) {
 502                         sprintf(fname, "qsfp%d", i + 1);
 503                         remove_file(dir, fname);
 504                 }
 505         }
 506         remove_file(dir, "flash");
 507         d_delete(dir);
 508         ret = simple_rmdir(root->d_inode, dir);
 509
 510 bail:
 511         mutex_unlock(&root->d_inode->i_mutex);
 512         dput(root);
 513         return ret;
 514 }
 515
 516 /*
 517  * This fills everything in when the fs is mounted, to handle umount/mount
 518  * after device init.  The direct add_cntr_files() call handles adding
 519  * them from the init code, when the fs is already mounted.
 520  */
 521 static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
 522 {
 523         struct qib_devdata *dd, *tmp;
 524         unsigned long flags;
 525         int ret;
 526
 527         static struct tree_descr files[] = {
 528                 [2] = {"driver_stats", &driver_ops[0], S_IRUGO},
 529                 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
 530                 {""},
 531         };
 532
 533         ret = simple_fill_super(sb, QIBFS_MAGIC, files);
 534         if (ret) {
 535                 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
 536                 goto bail;
 537         }
 538
 539         spin_lock_irqsave(&qib_devs_lock, flags);
 540
 541         list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) {
 542                 spin_unlock_irqrestore(&qib_devs_lock, flags);
 543                 ret = add_cntr_files(sb, dd);
 544                 if (ret)
 545                         goto bail;
 546                 spin_lock_irqsave(&qib_devs_lock, flags);
 547         }
 548
 549         spin_unlock_irqrestore(&qib_devs_lock, flags);
 550
 551 bail:
 552         return ret;
 553 }
 554
 555 static struct dentry *qibfs_mount(struct file_system_type *fs_type, int flags,
 556                         const char *dev_name, void *data)
 557 {
 558         struct dentry *ret;
 559         ret = mount_single(fs_type, flags, data, qibfs_fill_super);
 560         if (!IS_ERR(ret))
 561                 qib_super = ret->d_sb;
 562         return ret;
 563 }
 564
 565 static void qibfs_kill_super(struct super_block *s)
 566 {
 567         kill_litter_super(s);
 568         qib_super = NULL;
 569 }
 570
 571 int qibfs_add(struct qib_devdata *dd)
 572 {
 573         int ret;
 574
 575         /*
 576          * On first unit initialized, qib_super will not yet exist
 577          * because nobody has yet tried to mount the filesystem, so
 578          * we can't consider that to be an error; if an error occurs
 579          * during the mount, that will get a complaint, so this is OK.
 580          * add_cntr_files() for all units is done at mount from
 581          * qibfs_fill_super(), so one way or another, everything works.
 582          */
 583         if (qib_super == NULL)
 584                 ret = 0;
 585         else
 586                 ret = add_cntr_files(qib_super, dd);
 587         return ret;
 588 }
 589
 590 int qibfs_remove(struct qib_devdata *dd)
 591 {
 592         int ret = 0;
 593
 594         if (qib_super)
 595                 ret = remove_device_files(qib_super, dd);
 596
 597         return ret;
 598 }
 599
 600 static struct file_system_type qibfs_fs_type = {
 601         .owner =        THIS_MODULE,
 602         .name =         "ipathfs",
 603         .mount =        qibfs_mount,
 604         .kill_sb =      qibfs_kill_super,
 605 };
 606
 607 int __init qib_init_qibfs(void)
 608 {
 609         return register_filesystem(&qibfs_fs_type);
 610 }
 611
 612 int __exit qib_exit_qibfs(void)
 613 {
 614         return unregister_filesystem(&qibfs_fs_type);
 615 }