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 int 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 ((mode & S_IFMT) == S_IFDIR) { 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, mode_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 } 616