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/fs_context.h>
  38 #include <linux/mount.h>
  39 #include <linux/pagemap.h>
  40 #include <linux/init.h>
  41 #include <linux/namei.h>
  42
  43 #include "qib.h"
  44
  45 #define QIBFS_MAGIC 0x726a77
  46
  47 static struct super_block *qib_super;
  48
  49 #define private2dd(file) (file_inode(file)->i_private)
  50
  51 static int qibfs_mknod(struct inode *dir, struct dentry *dentry,
  52                        umode_t mode, const struct file_operations *fops,
  53                        void *data)
  54 {
  55         int error;
  56         struct inode *inode = new_inode(dir->i_sb);
  57
  58         if (!inode) {
  59                 error = -EPERM;
  60                 goto bail;
  61         }
  62
  63         inode->i_ino = get_next_ino();
  64         inode->i_mode = mode;
  65         inode->i_uid = GLOBAL_ROOT_UID;
  66         inode->i_gid = GLOBAL_ROOT_GID;
  67         inode->i_blocks = 0;
  68         inode->i_atime = current_time(inode);
  69         inode->i_mtime = inode->i_atime;
  70         inode->i_ctime = inode->i_atime;
  71         inode->i_private = data;
  72         if (S_ISDIR(mode)) {
  73                 inode->i_op = &simple_dir_inode_operations;
  74                 inc_nlink(inode);
  75                 inc_nlink(dir);
  76         }
  77
  78         inode->i_fop = fops;
  79
  80         d_instantiate(dentry, inode);
  81         error = 0;
  82
  83 bail:
  84         return error;
  85 }
  86
  87 static int create_file(const char *name, umode_t mode,
  88                        struct dentry *parent, struct dentry **dentry,
  89                        const struct file_operations *fops, void *data)
  90 {
  91         int error;
  92
  93         inode_lock(d_inode(parent));
  94         *dentry = lookup_one_len(name, parent, strlen(name));
  95         if (!IS_ERR(*dentry))
  96                 error = qibfs_mknod(d_inode(parent), *dentry,
  97                                     mode, fops, data);
  98         else
  99                 error = PTR_ERR(*dentry);
 100         inode_unlock(d_inode(parent));
 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         qib_stats.sps_ints = qib_sps_ints();
 109         return simple_read_from_buffer(buf, count, ppos, &qib_stats,
 110                                        sizeof(qib_stats));
 111 }
 112
 113 /*
 114  * driver stats field names, one line per stat, single string.  Used by
 115  * programs like ipathstats to print the stats in a way which works for
 116  * different versions of drivers, without changing program source.
 117  * if qlogic_ib_stats changes, this needs to change.  Names need to be
 118  * 12 chars or less (w/o newline), for proper display by ipathstats utility.
 119  */
 120 static const char qib_statnames[] =
 121         "KernIntr\n"
 122         "ErrorIntr\n"
 123         "Tx_Errs\n"
 124         "Rcv_Errs\n"
 125         "H/W_Errs\n"
 126         "NoPIOBufs\n"
 127         "CtxtsOpen\n"
 128         "RcvLen_Errs\n"
 129         "EgrBufFull\n"
 130         "EgrHdrFull\n"
 131         ;
 132
 133 static ssize_t driver_names_read(struct file *file, char __user *buf,
 134                                  size_t count, loff_t *ppos)
 135 {
 136         return simple_read_from_buffer(buf, count, ppos, qib_statnames,
 137                 sizeof(qib_statnames) - 1); /* no null */
 138 }
 139
 140 static const struct file_operations driver_ops[] = {
 141         { .read = driver_stats_read, .llseek = generic_file_llseek, },
 142         { .read = driver_names_read, .llseek = generic_file_llseek, },
 143 };
 144
 145 /* read the per-device counters */
 146 static ssize_t dev_counters_read(struct file *file, char __user *buf,
 147                                  size_t count, loff_t *ppos)
 148 {
 149         u64 *counters;
 150         size_t avail;
 151         struct qib_devdata *dd = private2dd(file);
 152
 153         avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
 154         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 155 }
 156
 157 /* read the per-device counters */
 158 static ssize_t dev_names_read(struct file *file, char __user *buf,
 159                               size_t count, loff_t *ppos)
 160 {
 161         char *names;
 162         size_t avail;
 163         struct qib_devdata *dd = private2dd(file);
 164
 165         avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
 166         return simple_read_from_buffer(buf, count, ppos, names, avail);
 167 }
 168
 169 static const struct file_operations cntr_ops[] = {
 170         { .read = dev_counters_read, .llseek = generic_file_llseek, },
 171         { .read = dev_names_read, .llseek = generic_file_llseek, },
 172 };
 173
 174 /*
 175  * Could use file_inode(file)->i_ino to figure out which file,
 176  * instead of separate routine for each, but for now, this works...
 177  */
 178
 179 /* read the per-port names (same for each port) */
 180 static ssize_t portnames_read(struct file *file, char __user *buf,
 181                               size_t count, loff_t *ppos)
 182 {
 183         char *names;
 184         size_t avail;
 185         struct qib_devdata *dd = private2dd(file);
 186
 187         avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
 188         return simple_read_from_buffer(buf, count, ppos, names, avail);
 189 }
 190
 191 /* read the per-port counters for port 1 (pidx 0) */
 192 static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
 193                                 size_t count, loff_t *ppos)
 194 {
 195         u64 *counters;
 196         size_t avail;
 197         struct qib_devdata *dd = private2dd(file);
 198
 199         avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
 200         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 201 }
 202
 203 /* read the per-port counters for port 2 (pidx 1) */
 204 static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
 205                                 size_t count, loff_t *ppos)
 206 {
 207         u64 *counters;
 208         size_t avail;
 209         struct qib_devdata *dd = private2dd(file);
 210
 211         avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
 212         return simple_read_from_buffer(buf, count, ppos, counters, avail);
 213 }
 214
 215 static const struct file_operations portcntr_ops[] = {
 216         { .read = portnames_read, .llseek = generic_file_llseek, },
 217         { .read = portcntrs_1_read, .llseek = generic_file_llseek, },
 218         { .read = portcntrs_2_read, .llseek = generic_file_llseek, },
 219 };
 220
 221 /*
 222  * read the per-port QSFP data for port 1 (pidx 0)
 223  */
 224 static ssize_t qsfp_1_read(struct file *file, char __user *buf,
 225                            size_t count, loff_t *ppos)
 226 {
 227         struct qib_devdata *dd = private2dd(file);
 228         char *tmp;
 229         int ret;
 230
 231         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 232         if (!tmp)
 233                 return -ENOMEM;
 234
 235         ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
 236         if (ret > 0)
 237                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 238         kfree(tmp);
 239         return ret;
 240 }
 241
 242 /*
 243  * read the per-port QSFP data for port 2 (pidx 1)
 244  */
 245 static ssize_t qsfp_2_read(struct file *file, char __user *buf,
 246                            size_t count, loff_t *ppos)
 247 {
 248         struct qib_devdata *dd = private2dd(file);
 249         char *tmp;
 250         int ret;
 251
 252         if (dd->num_pports < 2)
 253                 return -ENODEV;
 254
 255         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 256         if (!tmp)
 257                 return -ENOMEM;
 258
 259         ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
 260         if (ret > 0)
 261                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 262         kfree(tmp);
 263         return ret;
 264 }
 265
 266 static const struct file_operations qsfp_ops[] = {
 267         { .read = qsfp_1_read, .llseek = generic_file_llseek, },
 268         { .read = qsfp_2_read, .llseek = generic_file_llseek, },
 269 };
 270
 271 static ssize_t flash_read(struct file *file, char __user *buf,
 272                           size_t count, loff_t *ppos)
 273 {
 274         struct qib_devdata *dd;
 275         ssize_t ret;
 276         loff_t pos;
 277         char *tmp;
 278
 279         pos = *ppos;
 280
 281         if (pos < 0) {
 282                 ret = -EINVAL;
 283                 goto bail;
 284         }
 285
 286         if (pos >= sizeof(struct qib_flash)) {
 287                 ret = 0;
 288                 goto bail;
 289         }
 290
 291         if (count > sizeof(struct qib_flash) - pos)
 292                 count = sizeof(struct qib_flash) - pos;
 293
 294         tmp = kmalloc(count, GFP_KERNEL);
 295         if (!tmp) {
 296                 ret = -ENOMEM;
 297                 goto bail;
 298         }
 299
 300         dd = private2dd(file);
 301         if (qib_eeprom_read(dd, pos, tmp, count)) {
 302                 qib_dev_err(dd, "failed to read from flash\n");
 303                 ret = -ENXIO;
 304                 goto bail_tmp;
 305         }
 306
 307         if (copy_to_user(buf, tmp, count)) {
 308                 ret = -EFAULT;
 309                 goto bail_tmp;
 310         }
 311
 312         *ppos = pos + count;
 313         ret = count;
 314
 315 bail_tmp:
 316         kfree(tmp);
 317
 318 bail:
 319         return ret;
 320 }
 321
 322 static ssize_t flash_write(struct file *file, const char __user *buf,
 323                            size_t count, loff_t *ppos)
 324 {
 325         struct qib_devdata *dd;
 326         ssize_t ret;
 327         loff_t pos;
 328         char *tmp;
 329
 330         pos = *ppos;
 331
 332         if (pos != 0 || count != sizeof(struct qib_flash))
 333                 return -EINVAL;
 334
 335         tmp = memdup_user(buf, count);
 336         if (IS_ERR(tmp))
 337                 return PTR_ERR(tmp);
 338
 339         dd = private2dd(file);
 340         if (qib_eeprom_write(dd, pos, tmp, count)) {
 341                 ret = -ENXIO;
 342                 qib_dev_err(dd, "failed to write to flash\n");
 343                 goto bail_tmp;
 344         }
 345
 346         *ppos = pos + count;
 347         ret = count;
 348
 349 bail_tmp:
 350         kfree(tmp);
 351         return ret;
 352 }
 353
 354 static const struct file_operations flash_ops = {
 355         .read = flash_read,
 356         .write = flash_write,
 357         .llseek = default_llseek,
 358 };
 359
 360 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
 361 {
 362         struct dentry *dir, *tmp;
 363         char unit[10];
 364         int ret, i;
 365
 366         /* create the per-unit directory */
 367         snprintf(unit, sizeof(unit), "%u", dd->unit);
 368         ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
 369                           &simple_dir_operations, dd);
 370         if (ret) {
 371                 pr_err("create_file(%s) failed: %d\n", unit, ret);
 372                 goto bail;
 373         }
 374
 375         /* create the files in the new directory */
 376         ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
 377                           &cntr_ops[0], dd);
 378         if (ret) {
 379                 pr_err("create_file(%s/counters) failed: %d\n",
 380                        unit, ret);
 381                 goto bail;
 382         }
 383         ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
 384                           &cntr_ops[1], dd);
 385         if (ret) {
 386                 pr_err("create_file(%s/counter_names) failed: %d\n",
 387                        unit, ret);
 388                 goto bail;
 389         }
 390         ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
 391                           &portcntr_ops[0], dd);
 392         if (ret) {
 393                 pr_err("create_file(%s/%s) failed: %d\n",
 394                        unit, "portcounter_names", ret);
 395                 goto bail;
 396         }
 397         for (i = 1; i <= dd->num_pports; i++) {
 398                 char fname[24];
 399
 400                 sprintf(fname, "port%dcounters", i);
 401                 /* create the files in the new directory */
 402                 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
 403                                   &portcntr_ops[i], dd);
 404                 if (ret) {
 405                         pr_err("create_file(%s/%s) failed: %d\n",
 406                                 unit, fname, ret);
 407                         goto bail;
 408                 }
 409                 if (!(dd->flags & QIB_HAS_QSFP))
 410                         continue;
 411                 sprintf(fname, "qsfp%d", i);
 412                 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
 413                                   &qsfp_ops[i - 1], dd);
 414                 if (ret) {
 415                         pr_err("create_file(%s/%s) failed: %d\n",
 416                                 unit, fname, ret);
 417                         goto bail;
 418                 }
 419         }
 420
 421         ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
 422                           &flash_ops, dd);
 423         if (ret)
 424                 pr_err("create_file(%s/flash) failed: %d\n",
 425                         unit, ret);
 426 bail:
 427         return ret;
 428 }
 429
 430 static int remove_file(struct dentry *parent, char *name)
 431 {
 432         struct dentry *tmp;
 433         int ret;
 434
 435         tmp = lookup_one_len(name, parent, strlen(name));
 436
 437         if (IS_ERR(tmp)) {
 438                 ret = PTR_ERR(tmp);
 439                 goto bail;
 440         }
 441
 442         spin_lock(&tmp->d_lock);
 443         if (simple_positive(tmp)) {
 444                 __d_drop(tmp);
 445                 spin_unlock(&tmp->d_lock);
 446                 simple_unlink(d_inode(parent), tmp);
 447         } else {
 448                 spin_unlock(&tmp->d_lock);
 449         }
 450         dput(tmp);
 451
 452         ret = 0;
 453 bail:
 454         /*
 455          * We don't expect clients to care about the return value, but
 456          * it's there if they need it.
 457          */
 458         return ret;
 459 }
 460
 461 static int remove_device_files(struct super_block *sb,
 462                                struct qib_devdata *dd)
 463 {
 464         struct dentry *dir, *root;
 465         char unit[10];
 466         int ret, i;
 467
 468         root = dget(sb->s_root);
 469         inode_lock(d_inode(root));
 470         snprintf(unit, sizeof(unit), "%u", dd->unit);
 471         dir = lookup_one_len(unit, root, strlen(unit));
 472
 473         if (IS_ERR(dir)) {
 474                 ret = PTR_ERR(dir);
 475                 pr_err("Lookup of %s failed\n", unit);
 476                 goto bail;
 477         }
 478
 479         inode_lock(d_inode(dir));
 480         remove_file(dir, "counters");
 481         remove_file(dir, "counter_names");
 482         remove_file(dir, "portcounter_names");
 483         for (i = 0; i < dd->num_pports; i++) {
 484                 char fname[24];
 485
 486                 sprintf(fname, "port%dcounters", i + 1);
 487                 remove_file(dir, fname);
 488                 if (dd->flags & QIB_HAS_QSFP) {
 489                         sprintf(fname, "qsfp%d", i + 1);
 490                         remove_file(dir, fname);
 491                 }
 492         }
 493         remove_file(dir, "flash");
 494         inode_unlock(d_inode(dir));
 495         ret = simple_rmdir(d_inode(root), dir);
 496         d_drop(dir);
 497         dput(dir);
 498
 499 bail:
 500         inode_unlock(d_inode(root));
 501         dput(root);
 502         return ret;
 503 }
 504
 505 /*
 506  * This fills everything in when the fs is mounted, to handle umount/mount
 507  * after device init.  The direct add_cntr_files() call handles adding
 508  * them from the init code, when the fs is already mounted.
 509  */
 510 static int qibfs_fill_super(struct super_block *sb, struct fs_context *fc)
 511 {
 512         struct qib_devdata *dd;
 513         unsigned long index;
 514         int ret;
 515
 516         static const struct tree_descr files[] = {
 517                 [2] = {"driver_stats", &driver_ops[0], S_IRUGO},
 518                 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
 519                 {""},
 520         };
 521
 522         ret = simple_fill_super(sb, QIBFS_MAGIC, files);
 523         if (ret) {
 524                 pr_err("simple_fill_super failed: %d\n", ret);
 525                 goto bail;
 526         }
 527
 528         xa_for_each(&qib_dev_table, index, dd) {
 529                 ret = add_cntr_files(sb, dd);
 530                 if (ret)
 531                         goto bail;
 532         }
 533
 534 bail:
 535         return ret;
 536 }
 537
 538 static int qibfs_get_tree(struct fs_context *fc)
 539 {
 540         int ret = get_tree_single(fc, qibfs_fill_super);
 541         if (ret == 0)
 542                 qib_super = fc->root->d_sb;
 543         return ret;
 544 }
 545
 546 static const struct fs_context_operations qibfs_context_ops = {
 547         .get_tree       = qibfs_get_tree,
 548 };
 549
 550 static int qibfs_init_fs_context(struct fs_context *fc)
 551 {
 552         fc->ops = &qibfs_context_ops;
 553         return 0;
 554 }
 555
 556 static void qibfs_kill_super(struct super_block *s)
 557 {
 558         kill_litter_super(s);
 559         qib_super = NULL;
 560 }
 561
 562 int qibfs_add(struct qib_devdata *dd)
 563 {
 564         int ret;
 565
 566         /*
 567          * On first unit initialized, qib_super will not yet exist
 568          * because nobody has yet tried to mount the filesystem, so
 569          * we can't consider that to be an error; if an error occurs
 570          * during the mount, that will get a complaint, so this is OK.
 571          * add_cntr_files() for all units is done at mount from
 572          * qibfs_fill_super(), so one way or another, everything works.
 573          */
 574         if (qib_super == NULL)
 575                 ret = 0;
 576         else
 577                 ret = add_cntr_files(qib_super, dd);
 578         return ret;
 579 }
 580
 581 int qibfs_remove(struct qib_devdata *dd)
 582 {
 583         int ret = 0;
 584
 585         if (qib_super)
 586                 ret = remove_device_files(qib_super, dd);
 587
 588         return ret;
 589 }
 590
 591 static struct file_system_type qibfs_fs_type = {
 592         .owner =        THIS_MODULE,
 593         .name =         "ipathfs",
 594         .init_fs_context = qibfs_init_fs_context,
 595         .kill_sb =      qibfs_kill_super,
 596 };
 597 MODULE_ALIAS_FS("ipathfs");
 598
 599 int __init qib_init_qibfs(void)
 600 {
 601         return register_filesystem(&qibfs_fs_type);
 602 }
 603
 604 int __exit qib_exit_qibfs(void)
 605 {
 606         return unregister_filesystem(&qibfs_fs_type);
 607 }