drivers/infiniband/hw/qib/qib_fs.c

   1 /*
   2  * Copyright (c) 2012 Intel Corporation. All rights reserved.
   3  * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
   4  * Copyright (c) 2006 PathScale, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  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 "qib.h"
  43
  44 #define QIBFS_MAGIC 0x726a77
  45
  46 static struct super_block *qib_super;
  47
  48 #define private2dd(file) (file_inode(file)->i_private)
  49
  50 static int qibfs_mknod(struct inode *dir, struct dentry *dentry,
  51                        umode_t mode, const struct file_operations *fops,
  52                        void *data)
  53 {
  54         int error;
  55         struct inode *inode = new_inode(dir->i_sb);
  56
  57         if (!inode) {
  58                 error = -EPERM;
  59                 goto bail;
  60         }
  61
  62         inode->i_ino = get_next_ino();
  63         inode->i_mode = mode;
  64         inode->i_uid = GLOBAL_ROOT_UID;
  65         inode->i_gid = GLOBAL_ROOT_GID;
  66         inode->i_blocks = 0;
  67         inode->i_atime = CURRENT_TIME;
  68         inode->i_mtime = inode->i_atime;
  69         inode->i_ctime = inode->i_atime;
  70         inode->i_private = data;
  71         if (S_ISDIR(mode)) {
  72                 inode->i_op = &simple_dir_inode_operations;
  73                 inc_nlink(inode);
  74                 inc_nlink(dir);
  75         }
  76
  77         inode->i_fop = fops;
  78
  79         d_instantiate(dentry, inode);
  80         error = 0;
  81
  82 bail:
  83         return error;
  84 }
  85
  86 static int create_file(const char *name, umode_t mode,
  87                        struct dentry *parent, struct dentry **dentry,
  88                        const struct file_operations *fops, void *data)
  89 {
  90         int error;
  91
  92         *dentry = NULL;
  93         mutex_lock(&parent->d_inode->i_mutex);
  94         *dentry = lookup_one_len(name, parent, strlen(name));
  95         if (!IS_ERR(*dentry))
  96                 error = qibfs_mknod(parent->d_inode, *dentry,
  97                                     mode, fops, data);
  98         else
  99                 error = PTR_ERR(*dentry);
 100         mutex_unlock(&parent->d_inode->i_mutex);
 101
 102         return error;
 103 }
 104
 105 static ssize_t driver_stats_read(struct file *file, char __user *buf,
 106                                  size_t count, loff_t *ppos)
 107 {
 108         return simple_read_from_buffer(buf, count, ppos, &qib_stats,
 109                                        sizeof qib_stats);
 110 }
 111
 112 /*
 113  * driver stats field names, one line per stat, single string.  Used by
 114  * programs like ipathstats to print the stats in a way which works for
 115  * different versions of drivers, without changing program source.
 116  * if qlogic_ib_stats changes, this needs to change.  Names need to be
 117  * 12 chars or less (w/o newline), for proper display by ipathstats utility.
 118  */
 119 static const char qib_statnames[] =
 120         "KernIntr\n"
 121         "ErrorIntr\n"
 122         "Tx_Errs\n"
 123         "Rcv_Errs\n"
 124         "H/W_Errs\n"
 125         "NoPIOBufs\n"
 126         "CtxtsOpen\n"
 127         "RcvLen_Errs\n"
 128         "EgrBufFull\n"
 129         "EgrHdrFull\n"
 130         ;
 131
 132 static ssize_t driver_names_read(struct file *file, char __user *buf,
 133                                  size_t count, loff_t *ppos)
 134 {
 135         return simple_read_from_buffer(buf, count, ppos, qib_statnames,
 136                 sizeof qib_statnames - 1); /* no null */
 137 }
 138
 139 static const struct file_operations driver_ops[] = {
 140         { .read = driver_stats_read, .llseek = generic_file_llseek, },
 141         { .read = driver_names_read, .llseek = generic_file_llseek, },
 142 };
 143
 144 /* read the per-device counters */
 145 static ssize_t dev_counters_read(struct file *file, char __user *buf,
 146                                  size_t count, loff_t *ppos)
 147 {
 148         u64 *counters;
 149         size_t avail;
 150         struct qib_devdata *dd = private2dd(file);
 151
 152         avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
 153         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 154 }
 155
 156 /* read the per-device counters */
 157 static ssize_t dev_names_read(struct file *file, char __user *buf,
 158                               size_t count, loff_t *ppos)
 159 {
 160         char *names;
 161         size_t avail;
 162         struct qib_devdata *dd = private2dd(file);
 163
 164         avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
 165         return simple_read_from_buffer(buf, count, ppos, names, avail);
 166 }
 167
 168 static const struct file_operations cntr_ops[] = {
 169         { .read = dev_counters_read, .llseek = generic_file_llseek, },
 170         { .read = dev_names_read, .llseek = generic_file_llseek, },
 171 };
 172
 173 /*
 174  * Could use file_inode(file)->i_ino to figure out which file,
 175  * instead of separate routine for each, but for now, this works...
 176  */
 177
 178 /* read the per-port names (same for each port) */
 179 static ssize_t portnames_read(struct file *file, char __user *buf,
 180                               size_t count, loff_t *ppos)
 181 {
 182         char *names;
 183         size_t avail;
 184         struct qib_devdata *dd = private2dd(file);
 185
 186         avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
 187         return simple_read_from_buffer(buf, count, ppos, names, avail);
 188 }
 189
 190 /* read the per-port counters for port 1 (pidx 0) */
 191 static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
 192                                 size_t count, loff_t *ppos)
 193 {
 194         u64 *counters;
 195         size_t avail;
 196         struct qib_devdata *dd = private2dd(file);
 197
 198         avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
 199         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 200 }
 201
 202 /* read the per-port counters for port 2 (pidx 1) */
 203 static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
 204                                 size_t count, loff_t *ppos)
 205 {
 206         u64 *counters;
 207         size_t avail;
 208         struct qib_devdata *dd = private2dd(file);
 209
 210         avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
 211         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 212 }
 213
 214 static const struct file_operations portcntr_ops[] = {
 215         { .read = portnames_read, .llseek = generic_file_llseek, },
 216         { .read = portcntrs_1_read, .llseek = generic_file_llseek, },
 217         { .read = portcntrs_2_read, .llseek = generic_file_llseek, },
 218 };
 219
 220 /*
 221  * read the per-port QSFP data for port 1 (pidx 0)
 222  */
 223 static ssize_t qsfp_1_read(struct file *file, char __user *buf,
 224                            size_t count, loff_t *ppos)
 225 {
 226         struct qib_devdata *dd = private2dd(file);
 227         char *tmp;
 228         int ret;
 229
 230         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 231         if (!tmp)
 232                 return -ENOMEM;
 233
 234         ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
 235         if (ret > 0)
 236                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 237         kfree(tmp);
 238         return ret;
 239 }
 240
 241 /*
 242  * read the per-port QSFP data for port 2 (pidx 1)
 243  */
 244 static ssize_t qsfp_2_read(struct file *file, char __user *buf,
 245                            size_t count, loff_t *ppos)
 246 {
 247         struct qib_devdata *dd = private2dd(file);
 248         char *tmp;
 249         int ret;
 250
 251         if (dd->num_pports < 2)
 252                 return -ENODEV;
 253
 254         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 255         if (!tmp)
 256                 return -ENOMEM;
 257
 258         ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
 259         if (ret > 0)
 260                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 261         kfree(tmp);
 262         return ret;
 263 }
 264
 265 static const struct file_operations qsfp_ops[] = {
 266         { .read = qsfp_1_read, .llseek = generic_file_llseek, },
 267         { .read = qsfp_2_read, .llseek = generic_file_llseek, },
 268 };
 269
 270 static ssize_t flash_read(struct file *file, char __user *buf,
 271                           size_t count, loff_t *ppos)
 272 {
 273         struct qib_devdata *dd;
 274         ssize_t ret;
 275         loff_t pos;
 276         char *tmp;
 277
 278         pos = *ppos;
 279
 280         if (pos < 0) {
 281                 ret = -EINVAL;
 282                 goto bail;
 283         }
 284
 285         if (pos >= sizeof(struct qib_flash)) {
 286                 ret = 0;
 287                 goto bail;
 288         }
 289
 290         if (count > sizeof(struct qib_flash) - pos)
 291                 count = sizeof(struct qib_flash) - pos;
 292
 293         tmp = kmalloc(count, GFP_KERNEL);
 294         if (!tmp) {
 295                 ret = -ENOMEM;
 296                 goto bail;
 297         }
 298
 299         dd = private2dd(file);
 300         if (qib_eeprom_read(dd, pos, tmp, count)) {
 301                 qib_dev_err(dd, "failed to read from flash\n");
 302                 ret = -ENXIO;
 303                 goto bail_tmp;
 304         }
 305
 306         if (copy_to_user(buf, tmp, count)) {
 307                 ret = -EFAULT;
 308                 goto bail_tmp;
 309         }
 310
 311         *ppos = pos + count;
 312         ret = count;
 313
 314 bail_tmp:
 315         kfree(tmp);
 316
 317 bail:
 318         return ret;
 319 }
 320
 321 static ssize_t flash_write(struct file *file, const char __user *buf,
 322                            size_t count, loff_t *ppos)
 323 {
 324         struct qib_devdata *dd;
 325         ssize_t ret;
 326         loff_t pos;
 327         char *tmp;
 328
 329         pos = *ppos;
 330
 331         if (pos != 0) {
 332                 ret = -EINVAL;
 333                 goto bail;
 334         }
 335
 336         if (count != sizeof(struct qib_flash)) {
 337                 ret = -EINVAL;
 338                 goto bail;
 339         }
 340
 341         tmp = kmalloc(count, GFP_KERNEL);
 342         if (!tmp) {
 343                 ret = -ENOMEM;
 344                 goto bail;
 345         }
 346
 347         if (copy_from_user(tmp, buf, count)) {
 348                 ret = -EFAULT;
 349                 goto bail_tmp;
 350         }
 351
 352         dd = private2dd(file);
 353         if (qib_eeprom_write(dd, pos, tmp, count)) {
 354                 ret = -ENXIO;
 355                 qib_dev_err(dd, "failed to write to flash\n");
 356                 goto bail_tmp;
 357         }
 358
 359         *ppos = pos + count;
 360         ret = count;
 361
 362 bail_tmp:
 363         kfree(tmp);
 364
 365 bail:
 366         return ret;
 367 }
 368
 369 static const struct file_operations flash_ops = {
 370         .read = flash_read,
 371         .write = flash_write,
 372         .llseek = default_llseek,
 373 };
 374
 375 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
 376 {
 377         struct dentry *dir, *tmp;
 378         char unit[10];
 379         int ret, i;
 380
 381         /* create the per-unit directory */
 382         snprintf(unit, sizeof unit, "%u", dd->unit);
 383         ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
 384                           &simple_dir_operations, dd);
 385         if (ret) {
 386                 pr_err("create_file(%s) failed: %d\n", unit, ret);
 387                 goto bail;
 388         }
 389
 390         /* create the files in the new directory */
 391         ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
 392                           &cntr_ops[0], dd);
 393         if (ret) {
 394                 pr_err("create_file(%s/counters) failed: %d\n",
 395                        unit, ret);
 396                 goto bail;
 397         }
 398         ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
 399                           &cntr_ops[1], dd);
 400         if (ret) {
 401                 pr_err("create_file(%s/counter_names) failed: %d\n",
 402                        unit, ret);
 403                 goto bail;
 404         }
 405         ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
 406                           &portcntr_ops[0], dd);
 407         if (ret) {
 408                 pr_err("create_file(%s/%s) failed: %d\n",
 409                        unit, "portcounter_names", ret);
 410                 goto bail;
 411         }
 412         for (i = 1; i <= dd->num_pports; i++) {
 413                 char fname[24];
 414
 415                 sprintf(fname, "port%dcounters", i);
 416                 /* create the files in the new directory */
 417                 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
 418                                   &portcntr_ops[i], dd);
 419                 if (ret) {
 420                         pr_err("create_file(%s/%s) failed: %d\n",
 421                                 unit, fname, ret);
 422                         goto bail;
 423                 }
 424                 if (!(dd->flags & QIB_HAS_QSFP))
 425                         continue;
 426                 sprintf(fname, "qsfp%d", i);
 427                 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
 428                                   &qsfp_ops[i - 1], dd);
 429                 if (ret) {
 430                         pr_err("create_file(%s/%s) failed: %d\n",
 431                                 unit, fname, ret);
 432                         goto bail;
 433                 }
 434         }
 435
 436         ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
 437                           &flash_ops, dd);
 438         if (ret)
 439                 pr_err("create_file(%s/flash) failed: %d\n",
 440                         unit, ret);
 441 bail:
 442         return ret;
 443 }
 444
 445 static int remove_file(struct dentry *parent, char *name)
 446 {
 447         struct dentry *tmp;
 448         int ret;
 449
 450         tmp = lookup_one_len(name, parent, strlen(name));
 451
 452         if (IS_ERR(tmp)) {
 453                 ret = PTR_ERR(tmp);
 454                 goto bail;
 455         }
 456
 457         spin_lock(&tmp->d_lock);
 458         if (!(d_unhashed(tmp) && tmp->d_inode)) {
 459                 dget_dlock(tmp);
 460                 __d_drop(tmp);
 461                 spin_unlock(&tmp->d_lock);
 462                 simple_unlink(parent->d_inode, tmp);
 463         } else {
 464                 spin_unlock(&tmp->d_lock);
 465         }
 466
 467         ret = 0;
 468 bail:
 469         /*
 470          * We don't expect clients to care about the return value, but
 471          * it's there if they need it.
 472          */
 473         return ret;
 474 }
 475
 476 static int remove_device_files(struct super_block *sb,
 477                                struct qib_devdata *dd)
 478 {
 479         struct dentry *dir, *root;
 480         char unit[10];
 481         int ret, i;
 482
 483         root = dget(sb->s_root);
 484         mutex_lock(&root->d_inode->i_mutex);
 485         snprintf(unit, sizeof unit, "%u", dd->unit);
 486         dir = lookup_one_len(unit, root, strlen(unit));
 487
 488         if (IS_ERR(dir)) {
 489                 ret = PTR_ERR(dir);
 490                 pr_err("Lookup of %s failed\n", unit);
 491                 goto bail;
 492         }
 493
 494         remove_file(dir, "counters");
 495         remove_file(dir, "counter_names");
 496         remove_file(dir, "portcounter_names");
 497         for (i = 0; i < dd->num_pports; i++) {
 498                 char fname[24];
 499
 500                 sprintf(fname, "port%dcounters", i + 1);
 501                 remove_file(dir, fname);
 502                 if (dd->flags & QIB_HAS_QSFP) {
 503                         sprintf(fname, "qsfp%d", i + 1);
 504                         remove_file(dir, fname);
 505                 }
 506         }
 507         remove_file(dir, "flash");
 508         d_delete(dir);
 509         ret = simple_rmdir(root->d_inode, dir);
 510
 511 bail:
 512         mutex_unlock(&root->d_inode->i_mutex);
 513         dput(root);
 514         return ret;
 515 }
 516
 517 /*
 518  * This fills everything in when the fs is mounted, to handle umount/mount
 519  * after device init.  The direct add_cntr_files() call handles adding
 520  * them from the init code, when the fs is already mounted.
 521  */
 522 static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
 523 {
 524         struct qib_devdata *dd, *tmp;
 525         unsigned long flags;
 526         int ret;
 527
 528         static struct tree_descr files[] = {
 529                 [2] = {"driver_stats", &driver_ops[0], S_IRUGO},
 530                 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
 531                 {""},
 532         };
 533
 534         ret = simple_fill_super(sb, QIBFS_MAGIC, files);
 535         if (ret) {
 536                 pr_err("simple_fill_super failed: %d\n", ret);
 537                 goto bail;
 538         }
 539
 540         spin_lock_irqsave(&qib_devs_lock, flags);
 541
 542         list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) {
 543                 spin_unlock_irqrestore(&qib_devs_lock, flags);
 544                 ret = add_cntr_files(sb, dd);
 545                 if (ret)
 546                         goto bail;
 547                 spin_lock_irqsave(&qib_devs_lock, flags);
 548         }
 549
 550         spin_unlock_irqrestore(&qib_devs_lock, flags);
 551
 552 bail:
 553         return ret;
 554 }
 555
 556 static struct dentry *qibfs_mount(struct file_system_type *fs_type, int flags,
 557                         const char *dev_name, void *data)
 558 {
 559         struct dentry *ret;
 560         ret = mount_single(fs_type, flags, data, qibfs_fill_super);
 561         if (!IS_ERR(ret))
 562                 qib_super = ret->d_sb;
 563         return ret;
 564 }
 565
 566 static void qibfs_kill_super(struct super_block *s)
 567 {
 568         kill_litter_super(s);
 569         qib_super = NULL;
 570 }
 571
 572 int qibfs_add(struct qib_devdata *dd)
 573 {
 574         int ret;
 575
 576         /*
 577          * On first unit initialized, qib_super will not yet exist
 578          * because nobody has yet tried to mount the filesystem, so
 579          * we can't consider that to be an error; if an error occurs
 580          * during the mount, that will get a complaint, so this is OK.
 581          * add_cntr_files() for all units is done at mount from
 582          * qibfs_fill_super(), so one way or another, everything works.
 583          */
 584         if (qib_super == NULL)
 585                 ret = 0;
 586         else
 587                 ret = add_cntr_files(qib_super, dd);
 588         return ret;
 589 }
 590
 591 int qibfs_remove(struct qib_devdata *dd)
 592 {
 593         int ret = 0;
 594
 595         if (qib_super)
 596                 ret = remove_device_files(qib_super, dd);
 597
 598         return ret;
 599 }
 600
 601 static struct file_system_type qibfs_fs_type = {
 602         .owner =        THIS_MODULE,
 603         .name =         "ipathfs",
 604         .mount =        qibfs_mount,
 605         .kill_sb =      qibfs_kill_super,
 606 };
 607 MODULE_ALIAS_FS("ipathfs");
 608
 609 int __init qib_init_qibfs(void)
 610 {
 611         return register_filesystem(&qibfs_fs_type);
 612 }
 613
 614 int __exit qib_exit_qibfs(void)
 615 {
 616         return unregister_filesystem(&qibfs_fs_type);
 617 }