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/fs.h> 36 #include <linux/fs_context.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(inode); 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 inode_lock(d_inode(parent)); 93 *dentry = lookup_one_len(name, parent, strlen(name)); 94 if (!IS_ERR(*dentry)) 95 error = qibfs_mknod(d_inode(parent), *dentry, 96 mode, fops, data); 97 else 98 error = PTR_ERR(*dentry); 99 inode_unlock(d_inode(parent)); 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 qib_stats.sps_ints = qib_sps_ints(); 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 || count != sizeof(struct qib_flash)) 332 return -EINVAL; 333 334 tmp = memdup_user(buf, count); 335 if (IS_ERR(tmp)) 336 return PTR_ERR(tmp); 337 338 dd = private2dd(file); 339 if (qib_eeprom_write(dd, pos, tmp, count)) { 340 ret = -ENXIO; 341 qib_dev_err(dd, "failed to write to flash\n"); 342 goto bail_tmp; 343 } 344 345 *ppos = pos + count; 346 ret = count; 347 348 bail_tmp: 349 kfree(tmp); 350 return ret; 351 } 352 353 static const struct file_operations flash_ops = { 354 .read = flash_read, 355 .write = flash_write, 356 .llseek = default_llseek, 357 }; 358 359 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd) 360 { 361 struct dentry *dir, *tmp; 362 char unit[10]; 363 int ret, i; 364 365 /* create the per-unit directory */ 366 snprintf(unit, sizeof(unit), "%u", dd->unit); 367 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir, 368 &simple_dir_operations, dd); 369 if (ret) { 370 pr_err("create_file(%s) failed: %d\n", unit, ret); 371 goto bail; 372 } 373 374 /* create the files in the new directory */ 375 ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp, 376 &cntr_ops[0], dd); 377 if (ret) { 378 pr_err("create_file(%s/counters) failed: %d\n", 379 unit, ret); 380 goto bail; 381 } 382 ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp, 383 &cntr_ops[1], dd); 384 if (ret) { 385 pr_err("create_file(%s/counter_names) failed: %d\n", 386 unit, ret); 387 goto bail; 388 } 389 ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp, 390 &portcntr_ops[0], dd); 391 if (ret) { 392 pr_err("create_file(%s/%s) failed: %d\n", 393 unit, "portcounter_names", ret); 394 goto bail; 395 } 396 for (i = 1; i <= dd->num_pports; i++) { 397 char fname[24]; 398 399 sprintf(fname, "port%dcounters", i); 400 /* create the files in the new directory */ 401 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp, 402 &portcntr_ops[i], dd); 403 if (ret) { 404 pr_err("create_file(%s/%s) failed: %d\n", 405 unit, fname, ret); 406 goto bail; 407 } 408 if (!(dd->flags & QIB_HAS_QSFP)) 409 continue; 410 sprintf(fname, "qsfp%d", i); 411 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp, 412 &qsfp_ops[i - 1], dd); 413 if (ret) { 414 pr_err("create_file(%s/%s) failed: %d\n", 415 unit, fname, ret); 416 goto bail; 417 } 418 } 419 420 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp, 421 &flash_ops, dd); 422 if (ret) 423 pr_err("create_file(%s/flash) failed: %d\n", 424 unit, ret); 425 bail: 426 return ret; 427 } 428 429 static int remove_device_files(struct super_block *sb, 430 struct qib_devdata *dd) 431 { 432 struct dentry *dir; 433 char unit[10]; 434 435 snprintf(unit, sizeof(unit), "%u", dd->unit); 436 dir = lookup_one_len_unlocked(unit, sb->s_root, strlen(unit)); 437 438 if (IS_ERR(dir)) { 439 pr_err("Lookup of %s failed\n", unit); 440 return PTR_ERR(dir); 441 } 442 simple_recursive_removal(dir, NULL); 443 return 0; 444 } 445 446 /* 447 * This fills everything in when the fs is mounted, to handle umount/mount 448 * after device init. The direct add_cntr_files() call handles adding 449 * them from the init code, when the fs is already mounted. 450 */ 451 static int qibfs_fill_super(struct super_block *sb, struct fs_context *fc) 452 { 453 struct qib_devdata *dd; 454 unsigned long index; 455 int ret; 456 457 static const struct tree_descr files[] = { 458 [2] = {"driver_stats", &driver_ops[0], S_IRUGO}, 459 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO}, 460 {""}, 461 }; 462 463 ret = simple_fill_super(sb, QIBFS_MAGIC, files); 464 if (ret) { 465 pr_err("simple_fill_super failed: %d\n", ret); 466 goto bail; 467 } 468 469 xa_for_each(&qib_dev_table, index, dd) { 470 ret = add_cntr_files(sb, dd); 471 if (ret) 472 goto bail; 473 } 474 475 bail: 476 return ret; 477 } 478 479 static int qibfs_get_tree(struct fs_context *fc) 480 { 481 int ret = get_tree_single(fc, qibfs_fill_super); 482 if (ret == 0) 483 qib_super = fc->root->d_sb; 484 return ret; 485 } 486 487 static const struct fs_context_operations qibfs_context_ops = { 488 .get_tree = qibfs_get_tree, 489 }; 490 491 static int qibfs_init_fs_context(struct fs_context *fc) 492 { 493 fc->ops = &qibfs_context_ops; 494 return 0; 495 } 496 497 static void qibfs_kill_super(struct super_block *s) 498 { 499 kill_litter_super(s); 500 qib_super = NULL; 501 } 502 503 int qibfs_add(struct qib_devdata *dd) 504 { 505 int ret; 506 507 /* 508 * On first unit initialized, qib_super will not yet exist 509 * because nobody has yet tried to mount the filesystem, so 510 * we can't consider that to be an error; if an error occurs 511 * during the mount, that will get a complaint, so this is OK. 512 * add_cntr_files() for all units is done at mount from 513 * qibfs_fill_super(), so one way or another, everything works. 514 */ 515 if (qib_super == NULL) 516 ret = 0; 517 else 518 ret = add_cntr_files(qib_super, dd); 519 return ret; 520 } 521 522 int qibfs_remove(struct qib_devdata *dd) 523 { 524 int ret = 0; 525 526 if (qib_super) 527 ret = remove_device_files(qib_super, dd); 528 529 return ret; 530 } 531 532 static struct file_system_type qibfs_fs_type = { 533 .owner = THIS_MODULE, 534 .name = "ipathfs", 535 .init_fs_context = qibfs_init_fs_context, 536 .kill_sb = qibfs_kill_super, 537 }; 538 MODULE_ALIAS_FS("ipathfs"); 539 540 int __init qib_init_qibfs(void) 541 { 542 return register_filesystem(&qibfs_fs_type); 543 } 544 545 int __exit qib_exit_qibfs(void) 546 { 547 return unregister_filesystem(&qibfs_fs_type); 548 } 549