56f12202ff49b73f2552fbcc3385118937d03f3b
[linux-2.6.git] / drivers / infiniband / hw / ipath / ipath_sysfs.c
1 /*
2  * Copyright (c) 2006 QLogic, Inc. 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/ctype.h>
35 #include <linux/pci.h>
36
37 #include "ipath_kernel.h"
38 #include "ipath_common.h"
39
40 /**
41  * ipath_parse_ushort - parse an unsigned short value in an arbitrary base
42  * @str: the string containing the number
43  * @valp: where to put the result
44  *
45  * returns the number of bytes consumed, or negative value on error
46  */
47 int ipath_parse_ushort(const char *str, unsigned short *valp)
48 {
49         unsigned long val;
50         char *end;
51         int ret;
52
53         if (!isdigit(str[0])) {
54                 ret = -EINVAL;
55                 goto bail;
56         }
57
58         val = simple_strtoul(str, &end, 0);
59
60         if (val > 0xffff) {
61                 ret = -EINVAL;
62                 goto bail;
63         }
64
65         *valp = val;
66
67         ret = end + 1 - str;
68         if (ret == 0)
69                 ret = -EINVAL;
70
71 bail:
72         return ret;
73 }
74
75 static ssize_t show_version(struct device_driver *dev, char *buf)
76 {
77         /* The string printed here is already newline-terminated. */
78         return scnprintf(buf, PAGE_SIZE, "%s", ib_ipath_version);
79 }
80
81 static ssize_t show_num_units(struct device_driver *dev, char *buf)
82 {
83         return scnprintf(buf, PAGE_SIZE, "%d\n",
84                          ipath_count_units(NULL, NULL, NULL));
85 }
86
87 static ssize_t show_status(struct device *dev,
88                            struct device_attribute *attr,
89                            char *buf)
90 {
91         struct ipath_devdata *dd = dev_get_drvdata(dev);
92         ssize_t ret;
93
94         if (!dd->ipath_statusp) {
95                 ret = -EINVAL;
96                 goto bail;
97         }
98
99         ret = scnprintf(buf, PAGE_SIZE, "0x%llx\n",
100                         (unsigned long long) *(dd->ipath_statusp));
101
102 bail:
103         return ret;
104 }
105
106 static const char *ipath_status_str[] = {
107         "Initted",
108         "Disabled",
109         "Admin_Disabled",
110         "OIB_SMA",
111         "SMA",
112         "Present",
113         "IB_link_up",
114         "IB_configured",
115         "NoIBcable",
116         "Fatal_Hardware_Error",
117         NULL,
118 };
119
120 static ssize_t show_status_str(struct device *dev,
121                                struct device_attribute *attr,
122                                char *buf)
123 {
124         struct ipath_devdata *dd = dev_get_drvdata(dev);
125         int i, any;
126         u64 s;
127         ssize_t ret;
128
129         if (!dd->ipath_statusp) {
130                 ret = -EINVAL;
131                 goto bail;
132         }
133
134         s = *(dd->ipath_statusp);
135         *buf = '\0';
136         for (any = i = 0; s && ipath_status_str[i]; i++) {
137                 if (s & 1) {
138                         if (any && strlcat(buf, " ", PAGE_SIZE) >=
139                             PAGE_SIZE)
140                                 /* overflow */
141                                 break;
142                         if (strlcat(buf, ipath_status_str[i],
143                                     PAGE_SIZE) >= PAGE_SIZE)
144                                 break;
145                         any = 1;
146                 }
147                 s >>= 1;
148         }
149         if (any)
150                 strlcat(buf, "\n", PAGE_SIZE);
151
152         ret = strlen(buf);
153
154 bail:
155         return ret;
156 }
157
158 static ssize_t show_boardversion(struct device *dev,
159                                struct device_attribute *attr,
160                                char *buf)
161 {
162         struct ipath_devdata *dd = dev_get_drvdata(dev);
163         /* The string printed here is already newline-terminated. */
164         return scnprintf(buf, PAGE_SIZE, "%s", dd->ipath_boardversion);
165 }
166
167 static ssize_t show_lid(struct device *dev,
168                         struct device_attribute *attr,
169                         char *buf)
170 {
171         struct ipath_devdata *dd = dev_get_drvdata(dev);
172
173         return scnprintf(buf, PAGE_SIZE, "0x%x\n", dd->ipath_lid);
174 }
175
176 static ssize_t store_lid(struct device *dev,
177                          struct device_attribute *attr,
178                           const char *buf,
179                           size_t count)
180 {
181         struct ipath_devdata *dd = dev_get_drvdata(dev);
182         u16 lid = 0;
183         int ret;
184
185         ret = ipath_parse_ushort(buf, &lid);
186         if (ret < 0)
187                 goto invalid;
188
189         if (lid == 0 || lid >= IPATH_MULTICAST_LID_BASE) {
190                 ret = -EINVAL;
191                 goto invalid;
192         }
193
194         ipath_set_lid(dd, lid, 0);
195
196         goto bail;
197 invalid:
198         ipath_dev_err(dd, "attempt to set invalid LID 0x%x\n", lid);
199 bail:
200         return ret;
201 }
202
203 static ssize_t show_mlid(struct device *dev,
204                          struct device_attribute *attr,
205                          char *buf)
206 {
207         struct ipath_devdata *dd = dev_get_drvdata(dev);
208
209         return scnprintf(buf, PAGE_SIZE, "0x%x\n", dd->ipath_mlid);
210 }
211
212 static ssize_t store_mlid(struct device *dev,
213                          struct device_attribute *attr,
214                           const char *buf,
215                           size_t count)
216 {
217         struct ipath_devdata *dd = dev_get_drvdata(dev);
218         int unit;
219         u16 mlid;
220         int ret;
221
222         ret = ipath_parse_ushort(buf, &mlid);
223         if (ret < 0 || mlid < IPATH_MULTICAST_LID_BASE)
224                 goto invalid;
225
226         unit = dd->ipath_unit;
227
228         dd->ipath_mlid = mlid;
229
230         goto bail;
231 invalid:
232         ipath_dev_err(dd, "attempt to set invalid MLID\n");
233 bail:
234         return ret;
235 }
236
237 static ssize_t show_guid(struct device *dev,
238                          struct device_attribute *attr,
239                          char *buf)
240 {
241         struct ipath_devdata *dd = dev_get_drvdata(dev);
242         u8 *guid;
243
244         guid = (u8 *) & (dd->ipath_guid);
245
246         return scnprintf(buf, PAGE_SIZE,
247                          "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
248                          guid[0], guid[1], guid[2], guid[3],
249                          guid[4], guid[5], guid[6], guid[7]);
250 }
251
252 static ssize_t store_guid(struct device *dev,
253                          struct device_attribute *attr,
254                           const char *buf,
255                           size_t count)
256 {
257         struct ipath_devdata *dd = dev_get_drvdata(dev);
258         ssize_t ret;
259         unsigned short guid[8];
260         __be64 nguid;
261         u8 *ng;
262         int i;
263
264         if (sscanf(buf, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
265                    &guid[0], &guid[1], &guid[2], &guid[3],
266                    &guid[4], &guid[5], &guid[6], &guid[7]) != 8)
267                 goto invalid;
268
269         ng = (u8 *) &nguid;
270
271         for (i = 0; i < 8; i++) {
272                 if (guid[i] > 0xff)
273                         goto invalid;
274                 ng[i] = guid[i];
275         }
276
277         dd->ipath_guid = nguid;
278         dd->ipath_nguid = 1;
279
280         ret = strlen(buf);
281         goto bail;
282
283 invalid:
284         ipath_dev_err(dd, "attempt to set invalid GUID\n");
285         ret = -EINVAL;
286
287 bail:
288         return ret;
289 }
290
291 static ssize_t show_nguid(struct device *dev,
292                           struct device_attribute *attr,
293                           char *buf)
294 {
295         struct ipath_devdata *dd = dev_get_drvdata(dev);
296
297         return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_nguid);
298 }
299
300 static ssize_t show_serial(struct device *dev,
301                            struct device_attribute *attr,
302                            char *buf)
303 {
304         struct ipath_devdata *dd = dev_get_drvdata(dev);
305
306         buf[sizeof dd->ipath_serial] = '\0';
307         memcpy(buf, dd->ipath_serial, sizeof dd->ipath_serial);
308         strcat(buf, "\n");
309         return strlen(buf);
310 }
311
312 static ssize_t show_unit(struct device *dev,
313                          struct device_attribute *attr,
314                          char *buf)
315 {
316         struct ipath_devdata *dd = dev_get_drvdata(dev);
317
318         return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_unit);
319 }
320
321 #define DEVICE_COUNTER(name, attr) \
322         static ssize_t show_counter_##name(struct device *dev, \
323                                            struct device_attribute *attr, \
324                                            char *buf) \
325         { \
326                 struct ipath_devdata *dd = dev_get_drvdata(dev); \
327                 return scnprintf(\
328                         buf, PAGE_SIZE, "%llu\n", (unsigned long long) \
329                         ipath_snap_cntr( \
330                                 dd, offsetof(struct infinipath_counters, \
331                                              attr) / sizeof(u64)));     \
332         } \
333         static DEVICE_ATTR(name, S_IRUGO, show_counter_##name, NULL);
334
335 DEVICE_COUNTER(ib_link_downeds, IBLinkDownedCnt);
336 DEVICE_COUNTER(ib_link_err_recoveries, IBLinkErrRecoveryCnt);
337 DEVICE_COUNTER(ib_status_changes, IBStatusChangeCnt);
338 DEVICE_COUNTER(ib_symbol_errs, IBSymbolErrCnt);
339 DEVICE_COUNTER(lb_flow_stalls, LBFlowStallCnt);
340 DEVICE_COUNTER(lb_ints, LBIntCnt);
341 DEVICE_COUNTER(rx_bad_formats, RxBadFormatCnt);
342 DEVICE_COUNTER(rx_buf_ovfls, RxBufOvflCnt);
343 DEVICE_COUNTER(rx_data_pkts, RxDataPktCnt);
344 DEVICE_COUNTER(rx_dropped_pkts, RxDroppedPktCnt);
345 DEVICE_COUNTER(rx_dwords, RxDwordCnt);
346 DEVICE_COUNTER(rx_ebps, RxEBPCnt);
347 DEVICE_COUNTER(rx_flow_ctrl_errs, RxFlowCtrlErrCnt);
348 DEVICE_COUNTER(rx_flow_pkts, RxFlowPktCnt);
349 DEVICE_COUNTER(rx_icrc_errs, RxICRCErrCnt);
350 DEVICE_COUNTER(rx_len_errs, RxLenErrCnt);
351 DEVICE_COUNTER(rx_link_problems, RxLinkProblemCnt);
352 DEVICE_COUNTER(rx_lpcrc_errs, RxLPCRCErrCnt);
353 DEVICE_COUNTER(rx_max_min_len_errs, RxMaxMinLenErrCnt);
354 DEVICE_COUNTER(rx_p0_hdr_egr_ovfls, RxP0HdrEgrOvflCnt);
355 DEVICE_COUNTER(rx_p1_hdr_egr_ovfls, RxP1HdrEgrOvflCnt);
356 DEVICE_COUNTER(rx_p2_hdr_egr_ovfls, RxP2HdrEgrOvflCnt);
357 DEVICE_COUNTER(rx_p3_hdr_egr_ovfls, RxP3HdrEgrOvflCnt);
358 DEVICE_COUNTER(rx_p4_hdr_egr_ovfls, RxP4HdrEgrOvflCnt);
359 DEVICE_COUNTER(rx_p5_hdr_egr_ovfls, RxP5HdrEgrOvflCnt);
360 DEVICE_COUNTER(rx_p6_hdr_egr_ovfls, RxP6HdrEgrOvflCnt);
361 DEVICE_COUNTER(rx_p7_hdr_egr_ovfls, RxP7HdrEgrOvflCnt);
362 DEVICE_COUNTER(rx_p8_hdr_egr_ovfls, RxP8HdrEgrOvflCnt);
363 DEVICE_COUNTER(rx_pkey_mismatches, RxPKeyMismatchCnt);
364 DEVICE_COUNTER(rx_tid_full_errs, RxTIDFullErrCnt);
365 DEVICE_COUNTER(rx_tid_valid_errs, RxTIDValidErrCnt);
366 DEVICE_COUNTER(rx_vcrc_errs, RxVCRCErrCnt);
367 DEVICE_COUNTER(tx_data_pkts, TxDataPktCnt);
368 DEVICE_COUNTER(tx_dropped_pkts, TxDroppedPktCnt);
369 DEVICE_COUNTER(tx_dwords, TxDwordCnt);
370 DEVICE_COUNTER(tx_flow_pkts, TxFlowPktCnt);
371 DEVICE_COUNTER(tx_flow_stalls, TxFlowStallCnt);
372 DEVICE_COUNTER(tx_len_errs, TxLenErrCnt);
373 DEVICE_COUNTER(tx_max_min_len_errs, TxMaxMinLenErrCnt);
374 DEVICE_COUNTER(tx_underruns, TxUnderrunCnt);
375 DEVICE_COUNTER(tx_unsup_vl_errs, TxUnsupVLErrCnt);
376
377 static struct attribute *dev_counter_attributes[] = {
378         &dev_attr_ib_link_downeds.attr,
379         &dev_attr_ib_link_err_recoveries.attr,
380         &dev_attr_ib_status_changes.attr,
381         &dev_attr_ib_symbol_errs.attr,
382         &dev_attr_lb_flow_stalls.attr,
383         &dev_attr_lb_ints.attr,
384         &dev_attr_rx_bad_formats.attr,
385         &dev_attr_rx_buf_ovfls.attr,
386         &dev_attr_rx_data_pkts.attr,
387         &dev_attr_rx_dropped_pkts.attr,
388         &dev_attr_rx_dwords.attr,
389         &dev_attr_rx_ebps.attr,
390         &dev_attr_rx_flow_ctrl_errs.attr,
391         &dev_attr_rx_flow_pkts.attr,
392         &dev_attr_rx_icrc_errs.attr,
393         &dev_attr_rx_len_errs.attr,
394         &dev_attr_rx_link_problems.attr,
395         &dev_attr_rx_lpcrc_errs.attr,
396         &dev_attr_rx_max_min_len_errs.attr,
397         &dev_attr_rx_p0_hdr_egr_ovfls.attr,
398         &dev_attr_rx_p1_hdr_egr_ovfls.attr,
399         &dev_attr_rx_p2_hdr_egr_ovfls.attr,
400         &dev_attr_rx_p3_hdr_egr_ovfls.attr,
401         &dev_attr_rx_p4_hdr_egr_ovfls.attr,
402         &dev_attr_rx_p5_hdr_egr_ovfls.attr,
403         &dev_attr_rx_p6_hdr_egr_ovfls.attr,
404         &dev_attr_rx_p7_hdr_egr_ovfls.attr,
405         &dev_attr_rx_p8_hdr_egr_ovfls.attr,
406         &dev_attr_rx_pkey_mismatches.attr,
407         &dev_attr_rx_tid_full_errs.attr,
408         &dev_attr_rx_tid_valid_errs.attr,
409         &dev_attr_rx_vcrc_errs.attr,
410         &dev_attr_tx_data_pkts.attr,
411         &dev_attr_tx_dropped_pkts.attr,
412         &dev_attr_tx_dwords.attr,
413         &dev_attr_tx_flow_pkts.attr,
414         &dev_attr_tx_flow_stalls.attr,
415         &dev_attr_tx_len_errs.attr,
416         &dev_attr_tx_max_min_len_errs.attr,
417         &dev_attr_tx_underruns.attr,
418         &dev_attr_tx_unsup_vl_errs.attr,
419         NULL
420 };
421
422 static struct attribute_group dev_counter_attr_group = {
423         .name = "counters",
424         .attrs = dev_counter_attributes
425 };
426
427 static ssize_t store_reset(struct device *dev,
428                          struct device_attribute *attr,
429                           const char *buf,
430                           size_t count)
431 {
432         struct ipath_devdata *dd = dev_get_drvdata(dev);
433         int ret;
434
435         if (count < 5 || memcmp(buf, "reset", 5)) {
436                 ret = -EINVAL;
437                 goto bail;
438         }
439
440         if (dd->ipath_flags & IPATH_DISABLED) {
441                 /*
442                  * post-reset init would re-enable interrupts, etc.
443                  * so don't allow reset on disabled devices.  Not
444                  * perfect error, but about the best choice.
445                  */
446                 dev_info(dev,"Unit %d is disabled, can't reset\n",
447                          dd->ipath_unit);
448                 ret = -EINVAL;
449         }
450         ret = ipath_reset_device(dd->ipath_unit);
451 bail:
452         return ret<0 ? ret : count;
453 }
454
455 static ssize_t store_link_state(struct device *dev,
456                          struct device_attribute *attr,
457                           const char *buf,
458                           size_t count)
459 {
460         struct ipath_devdata *dd = dev_get_drvdata(dev);
461         int ret, r;
462         u16 state;
463
464         ret = ipath_parse_ushort(buf, &state);
465         if (ret < 0)
466                 goto invalid;
467
468         r = ipath_set_linkstate(dd, state);
469         if (r < 0) {
470                 ret = r;
471                 goto bail;
472         }
473
474         goto bail;
475 invalid:
476         ipath_dev_err(dd, "attempt to set invalid link state\n");
477 bail:
478         return ret;
479 }
480
481 static ssize_t show_mtu(struct device *dev,
482                          struct device_attribute *attr,
483                          char *buf)
484 {
485         struct ipath_devdata *dd = dev_get_drvdata(dev);
486         return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_ibmtu);
487 }
488
489 static ssize_t store_mtu(struct device *dev,
490                          struct device_attribute *attr,
491                           const char *buf,
492                           size_t count)
493 {
494         struct ipath_devdata *dd = dev_get_drvdata(dev);
495         ssize_t ret;
496         u16 mtu = 0;
497         int r;
498
499         ret = ipath_parse_ushort(buf, &mtu);
500         if (ret < 0)
501                 goto invalid;
502
503         r = ipath_set_mtu(dd, mtu);
504         if (r < 0)
505                 ret = r;
506
507         goto bail;
508 invalid:
509         ipath_dev_err(dd, "attempt to set invalid MTU\n");
510 bail:
511         return ret;
512 }
513
514 static ssize_t show_enabled(struct device *dev,
515                          struct device_attribute *attr,
516                          char *buf)
517 {
518         struct ipath_devdata *dd = dev_get_drvdata(dev);
519         return scnprintf(buf, PAGE_SIZE, "%u\n",
520                          (dd->ipath_flags & IPATH_DISABLED) ? 0 : 1);
521 }
522
523 static ssize_t store_enabled(struct device *dev,
524                          struct device_attribute *attr,
525                           const char *buf,
526                           size_t count)
527 {
528         struct ipath_devdata *dd = dev_get_drvdata(dev);
529         ssize_t ret;
530         u16 enable = 0;
531
532         ret = ipath_parse_ushort(buf, &enable);
533         if (ret < 0) {
534                 ipath_dev_err(dd, "attempt to use non-numeric on enable\n");
535                 goto bail;
536         }
537
538         if (enable) {
539                 if (!(dd->ipath_flags & IPATH_DISABLED))
540                         goto bail;
541
542                 dev_info(dev, "Enabling unit %d\n", dd->ipath_unit);
543                 /* same as post-reset */
544                 ret = ipath_init_chip(dd, 1);
545                 if (ret)
546                         ipath_dev_err(dd, "Failed to enable unit %d\n",
547                                       dd->ipath_unit);
548                 else {
549                         dd->ipath_flags &= ~IPATH_DISABLED;
550                         *dd->ipath_statusp &= ~IPATH_STATUS_ADMIN_DISABLED;
551                 }
552         }
553         else if (!(dd->ipath_flags & IPATH_DISABLED)) {
554                 dev_info(dev, "Disabling unit %d\n", dd->ipath_unit);
555                 ipath_shutdown_device(dd);
556                 dd->ipath_flags |= IPATH_DISABLED;
557                 *dd->ipath_statusp |= IPATH_STATUS_ADMIN_DISABLED;
558         }
559
560 bail:
561         return ret;
562 }
563
564 static DRIVER_ATTR(num_units, S_IRUGO, show_num_units, NULL);
565 static DRIVER_ATTR(version, S_IRUGO, show_version, NULL);
566
567 static struct attribute *driver_attributes[] = {
568         &driver_attr_num_units.attr,
569         &driver_attr_version.attr,
570         NULL
571 };
572
573 static struct attribute_group driver_attr_group = {
574         .attrs = driver_attributes
575 };
576
577 static DEVICE_ATTR(guid, S_IWUSR | S_IRUGO, show_guid, store_guid);
578 static DEVICE_ATTR(lid, S_IWUSR | S_IRUGO, show_lid, store_lid);
579 static DEVICE_ATTR(link_state, S_IWUSR, NULL, store_link_state);
580 static DEVICE_ATTR(mlid, S_IWUSR | S_IRUGO, show_mlid, store_mlid);
581 static DEVICE_ATTR(mtu, S_IWUSR | S_IRUGO, show_mtu, store_mtu);
582 static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO, show_enabled, store_enabled);
583 static DEVICE_ATTR(nguid, S_IRUGO, show_nguid, NULL);
584 static DEVICE_ATTR(reset, S_IWUSR, NULL, store_reset);
585 static DEVICE_ATTR(serial, S_IRUGO, show_serial, NULL);
586 static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
587 static DEVICE_ATTR(status_str, S_IRUGO, show_status_str, NULL);
588 static DEVICE_ATTR(boardversion, S_IRUGO, show_boardversion, NULL);
589 static DEVICE_ATTR(unit, S_IRUGO, show_unit, NULL);
590
591 static struct attribute *dev_attributes[] = {
592         &dev_attr_guid.attr,
593         &dev_attr_lid.attr,
594         &dev_attr_link_state.attr,
595         &dev_attr_mlid.attr,
596         &dev_attr_mtu.attr,
597         &dev_attr_nguid.attr,
598         &dev_attr_serial.attr,
599         &dev_attr_status.attr,
600         &dev_attr_status_str.attr,
601         &dev_attr_boardversion.attr,
602         &dev_attr_unit.attr,
603         &dev_attr_enabled.attr,
604         NULL
605 };
606
607 static struct attribute_group dev_attr_group = {
608         .attrs = dev_attributes
609 };
610
611 /**
612  * ipath_expose_reset - create a device reset file
613  * @dev: the device structure
614  *
615  * Only expose a file that lets us reset the device after someone
616  * enters diag mode.  A device reset is quite likely to crash the
617  * machine entirely, so we don't want to normally make it
618  * available.
619  *
620  * Called with ipath_mutex held.
621  */
622 int ipath_expose_reset(struct device *dev)
623 {
624         static int exposed;
625         int ret;
626
627         if (!exposed) {
628                 ret = device_create_file(dev, &dev_attr_reset);
629                 exposed = 1;
630         }
631         else
632                 ret = 0;
633
634         return ret;
635 }
636
637 int ipath_driver_create_group(struct device_driver *drv)
638 {
639         int ret;
640
641         ret = sysfs_create_group(&drv->kobj, &driver_attr_group);
642
643         return ret;
644 }
645
646 void ipath_driver_remove_group(struct device_driver *drv)
647 {
648         sysfs_remove_group(&drv->kobj, &driver_attr_group);
649 }
650
651 int ipath_device_create_group(struct device *dev, struct ipath_devdata *dd)
652 {
653         int ret;
654         char unit[5];
655
656         ret = sysfs_create_group(&dev->kobj, &dev_attr_group);
657         if (ret)
658                 goto bail;
659
660         ret = sysfs_create_group(&dev->kobj, &dev_counter_attr_group);
661         if (ret)
662                 goto bail_attrs;
663
664         snprintf(unit, sizeof(unit), "%02d", dd->ipath_unit);
665         ret = sysfs_create_link(&dev->driver->kobj, &dev->kobj, unit);
666         if (ret == 0)
667                 goto bail;
668
669         sysfs_remove_group(&dev->kobj, &dev_counter_attr_group);
670 bail_attrs:
671         sysfs_remove_group(&dev->kobj, &dev_attr_group);
672 bail:
673         return ret;
674 }
675
676 void ipath_device_remove_group(struct device *dev, struct ipath_devdata *dd)
677 {
678         char unit[5];
679
680         snprintf(unit, sizeof(unit), "%02d", dd->ipath_unit);
681         sysfs_remove_link(&dev->driver->kobj, unit);
682
683         sysfs_remove_group(&dev->kobj, &dev_counter_attr_group);
684         sysfs_remove_group(&dev->kobj, &dev_attr_group);
685
686         device_remove_file(dev, &dev_attr_reset);
687 }