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_delete(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 } 608