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)->f_dentry->d_inode->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->f_dentry->d_inode->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 }; 607 608 int __init qib_init_qibfs(void) 609 { 610 return register_filesystem(&qibfs_fs_type); 611 } 612 613 int __exit qib_exit_qibfs(void) 614 { 615 return unregister_filesystem(&qibfs_fs_type); 616 } 617