IB/ipath: simplify layering code
[linux-2.6.git] / drivers / infiniband / hw / ipath / ipath_file_ops.c
1 /*
2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
3  * Copyright (c) 2003, 2004, 2005, 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/pci.h>
35 #include <linux/poll.h>
36 #include <linux/cdev.h>
37 #include <linux/swap.h>
38 #include <linux/vmalloc.h>
39 #include <asm/pgtable.h>
40
41 #include "ipath_kernel.h"
42 #include "ipath_common.h"
43
44 static int ipath_open(struct inode *, struct file *);
45 static int ipath_close(struct inode *, struct file *);
46 static ssize_t ipath_write(struct file *, const char __user *, size_t,
47                            loff_t *);
48 static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
49 static int ipath_mmap(struct file *, struct vm_area_struct *);
50
51 static struct file_operations ipath_file_ops = {
52         .owner = THIS_MODULE,
53         .write = ipath_write,
54         .open = ipath_open,
55         .release = ipath_close,
56         .poll = ipath_poll,
57         .mmap = ipath_mmap
58 };
59
60 static int ipath_get_base_info(struct ipath_portdata *pd,
61                                void __user *ubase, size_t ubase_size)
62 {
63         int ret = 0;
64         struct ipath_base_info *kinfo = NULL;
65         struct ipath_devdata *dd = pd->port_dd;
66
67         if (ubase_size < sizeof(*kinfo)) {
68                 ipath_cdbg(PROC,
69                            "Base size %lu, need %lu (version mismatch?)\n",
70                            (unsigned long) ubase_size,
71                            (unsigned long) sizeof(*kinfo));
72                 ret = -EINVAL;
73                 goto bail;
74         }
75
76         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
77         if (kinfo == NULL) {
78                 ret = -ENOMEM;
79                 goto bail;
80         }
81
82         ret = dd->ipath_f_get_base_info(pd, kinfo);
83         if (ret < 0)
84                 goto bail;
85
86         kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
87         kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
88         kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
89         kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
90         /*
91          * have to mmap whole thing
92          */
93         kinfo->spi_rcv_egrbuftotlen =
94                 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
95         kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
96         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
97                 pd->port_rcvegrbuf_chunks;
98         kinfo->spi_tidcnt = dd->ipath_rcvtidcnt;
99         /*
100          * for this use, may be ipath_cfgports summed over all chips that
101          * are are configured and present
102          */
103         kinfo->spi_nports = dd->ipath_cfgports;
104         /* unit (chip/board) our port is on */
105         kinfo->spi_unit = dd->ipath_unit;
106         /* for now, only a single page */
107         kinfo->spi_tid_maxsize = PAGE_SIZE;
108
109         /*
110          * Doing this per port, and based on the skip value, etc.  This has
111          * to be the actual buffer size, since the protocol code treats it
112          * as an array.
113          *
114          * These have to be set to user addresses in the user code via mmap.
115          * These values are used on return to user code for the mmap target
116          * addresses only.  For 32 bit, same 44 bit address problem, so use
117          * the physical address, not virtual.  Before 2.6.11, using the
118          * page_address() macro worked, but in 2.6.11, even that returns the
119          * full 64 bit address (upper bits all 1's).  So far, using the
120          * physical addresses (or chip offsets, for chip mapping) works, but
121          * no doubt some future kernel release will chang that, and we'll be
122          * on to yet another method of dealing with this
123          */
124         kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
125         kinfo->spi_rcvhdr_tailaddr = (u64)pd->port_rcvhdrqtailaddr_phys;
126         kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
127         kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
128         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
129                 (void *) dd->ipath_statusp -
130                 (void *) dd->ipath_pioavailregs_dma;
131         kinfo->spi_piobufbase = (u64) pd->port_piobufs;
132         kinfo->__spi_uregbase =
133                 dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
134
135         kinfo->spi_pioindex = dd->ipath_pbufsport * (pd->port_port - 1);
136         kinfo->spi_piocnt = dd->ipath_pbufsport;
137         kinfo->spi_pioalign = dd->ipath_palign;
138
139         kinfo->spi_qpair = IPATH_KD_QP;
140         kinfo->spi_piosize = dd->ipath_ibmaxlen;
141         kinfo->spi_mtu = dd->ipath_ibmaxlen;    /* maxlen, not ibmtu */
142         kinfo->spi_port = pd->port_port;
143         kinfo->spi_sw_version = IPATH_KERN_SWVERSION;
144         kinfo->spi_hw_version = dd->ipath_revision;
145
146         if (copy_to_user(ubase, kinfo, sizeof(*kinfo)))
147                 ret = -EFAULT;
148
149 bail:
150         kfree(kinfo);
151         return ret;
152 }
153
154 /**
155  * ipath_tid_update - update a port TID
156  * @pd: the port
157  * @ti: the TID information
158  *
159  * The new implementation as of Oct 2004 is that the driver assigns
160  * the tid and returns it to the caller.   To make it easier to
161  * catch bugs, and to reduce search time, we keep a cursor for
162  * each port, walking the shadow tid array to find one that's not
163  * in use.
164  *
165  * For now, if we can't allocate the full list, we fail, although
166  * in the long run, we'll allocate as many as we can, and the
167  * caller will deal with that by trying the remaining pages later.
168  * That means that when we fail, we have to mark the tids as not in
169  * use again, in our shadow copy.
170  *
171  * It's up to the caller to free the tids when they are done.
172  * We'll unlock the pages as they free them.
173  *
174  * Also, right now we are locking one page at a time, but since
175  * the intended use of this routine is for a single group of
176  * virtually contiguous pages, that should change to improve
177  * performance.
178  */
179 static int ipath_tid_update(struct ipath_portdata *pd,
180                             const struct ipath_tid_info *ti)
181 {
182         int ret = 0, ntids;
183         u32 tid, porttid, cnt, i, tidcnt;
184         u16 *tidlist;
185         struct ipath_devdata *dd = pd->port_dd;
186         u64 physaddr;
187         unsigned long vaddr;
188         u64 __iomem *tidbase;
189         unsigned long tidmap[8];
190         struct page **pagep = NULL;
191
192         if (!dd->ipath_pageshadow) {
193                 ret = -ENOMEM;
194                 goto done;
195         }
196
197         cnt = ti->tidcnt;
198         if (!cnt) {
199                 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
200                           (unsigned long long) ti->tidlist);
201                 /*
202                  * Should we treat as success?  likely a bug
203                  */
204                 ret = -EFAULT;
205                 goto done;
206         }
207         tidcnt = dd->ipath_rcvtidcnt;
208         if (cnt >= tidcnt) {
209                 /* make sure it all fits in port_tid_pg_list */
210                 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
211                          "TIDs, only trying max (%u)\n", cnt, tidcnt);
212                 cnt = tidcnt;
213         }
214         pagep = (struct page **)pd->port_tid_pg_list;
215         tidlist = (u16 *) (&pagep[cnt]);
216
217         memset(tidmap, 0, sizeof(tidmap));
218         tid = pd->port_tidcursor;
219         /* before decrement; chip actual # */
220         porttid = pd->port_port * tidcnt;
221         ntids = tidcnt;
222         tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
223                                    dd->ipath_rcvtidbase +
224                                    porttid * sizeof(*tidbase));
225
226         ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
227                    pd->port_port, cnt, tid, tidbase);
228
229         /* virtual address of first page in transfer */
230         vaddr = ti->tidvaddr;
231         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
232                        cnt * PAGE_SIZE)) {
233                 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
234                           (void *)vaddr, cnt);
235                 ret = -EFAULT;
236                 goto done;
237         }
238         ret = ipath_get_user_pages(vaddr, cnt, pagep);
239         if (ret) {
240                 if (ret == -EBUSY) {
241                         ipath_dbg("Failed to lock addr %p, %u pages "
242                                   "(already locked)\n",
243                                   (void *) vaddr, cnt);
244                         /*
245                          * for now, continue, and see what happens but with
246                          * the new implementation, this should never happen,
247                          * unless perhaps the user has mpin'ed the pages
248                          * themselves (something we need to test)
249                          */
250                         ret = 0;
251                 } else {
252                         dev_info(&dd->pcidev->dev,
253                                  "Failed to lock addr %p, %u pages: "
254                                  "errno %d\n", (void *) vaddr, cnt, -ret);
255                         goto done;
256                 }
257         }
258         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
259                 for (; ntids--; tid++) {
260                         if (tid == tidcnt)
261                                 tid = 0;
262                         if (!dd->ipath_pageshadow[porttid + tid])
263                                 break;
264                 }
265                 if (ntids < 0) {
266                         /*
267                          * oops, wrapped all the way through their TIDs,
268                          * and didn't have enough free; see comments at
269                          * start of routine
270                          */
271                         ipath_dbg("Not enough free TIDs for %u pages "
272                                   "(index %d), failing\n", cnt, i);
273                         i--;    /* last tidlist[i] not filled in */
274                         ret = -ENOMEM;
275                         break;
276                 }
277                 tidlist[i] = tid;
278                 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
279                            "vaddr %lx\n", i, tid, vaddr);
280                 /* we "know" system pages and TID pages are same size */
281                 dd->ipath_pageshadow[porttid + tid] = pagep[i];
282                 /*
283                  * don't need atomic or it's overhead
284                  */
285                 __set_bit(tid, tidmap);
286                 physaddr = page_to_phys(pagep[i]);
287                 ipath_stats.sps_pagelocks++;
288                 ipath_cdbg(VERBOSE,
289                            "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
290                            tid, vaddr, (unsigned long long) physaddr,
291                            pagep[i]);
292                 dd->ipath_f_put_tid(dd, &tidbase[tid], 1, physaddr);
293                 /*
294                  * don't check this tid in ipath_portshadow, since we
295                  * just filled it in; start with the next one.
296                  */
297                 tid++;
298         }
299
300         if (ret) {
301                 u32 limit;
302         cleanup:
303                 /* jump here if copy out of updated info failed... */
304                 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
305                           -ret, i, cnt);
306                 /* same code that's in ipath_free_tid() */
307                 limit = sizeof(tidmap) * BITS_PER_BYTE;
308                 if (limit > tidcnt)
309                         /* just in case size changes in future */
310                         limit = tidcnt;
311                 tid = find_first_bit((const unsigned long *)tidmap, limit);
312                 for (; tid < limit; tid++) {
313                         if (!test_bit(tid, tidmap))
314                                 continue;
315                         if (dd->ipath_pageshadow[porttid + tid]) {
316                                 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
317                                            tid);
318                                 dd->ipath_f_put_tid(dd, &tidbase[tid], 1,
319                                                     dd->ipath_tidinvalid);
320                                 dd->ipath_pageshadow[porttid + tid] = NULL;
321                                 ipath_stats.sps_pageunlocks++;
322                         }
323                 }
324                 ipath_release_user_pages(pagep, cnt);
325         } else {
326                 /*
327                  * Copy the updated array, with ipath_tid's filled in, back
328                  * to user.  Since we did the copy in already, this "should
329                  * never fail" If it does, we have to clean up...
330                  */
331                 if (copy_to_user((void __user *)
332                                  (unsigned long) ti->tidlist,
333                                  tidlist, cnt * sizeof(*tidlist))) {
334                         ret = -EFAULT;
335                         goto cleanup;
336                 }
337                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
338                                  tidmap, sizeof tidmap)) {
339                         ret = -EFAULT;
340                         goto cleanup;
341                 }
342                 if (tid == tidcnt)
343                         tid = 0;
344                 pd->port_tidcursor = tid;
345         }
346
347 done:
348         if (ret)
349                 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
350                           ti->tidcnt, -ret);
351         return ret;
352 }
353
354 /**
355  * ipath_tid_free - free a port TID
356  * @pd: the port
357  * @ti: the TID info
358  *
359  * right now we are unlocking one page at a time, but since
360  * the intended use of this routine is for a single group of
361  * virtually contiguous pages, that should change to improve
362  * performance.  We check that the TID is in range for this port
363  * but otherwise don't check validity; if user has an error and
364  * frees the wrong tid, it's only their own data that can thereby
365  * be corrupted.  We do check that the TID was in use, for sanity
366  * We always use our idea of the saved address, not the address that
367  * they pass in to us.
368  */
369
370 static int ipath_tid_free(struct ipath_portdata *pd,
371                           const struct ipath_tid_info *ti)
372 {
373         int ret = 0;
374         u32 tid, porttid, cnt, limit, tidcnt;
375         struct ipath_devdata *dd = pd->port_dd;
376         u64 __iomem *tidbase;
377         unsigned long tidmap[8];
378
379         if (!dd->ipath_pageshadow) {
380                 ret = -ENOMEM;
381                 goto done;
382         }
383
384         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
385                            sizeof tidmap)) {
386                 ret = -EFAULT;
387                 goto done;
388         }
389
390         porttid = pd->port_port * dd->ipath_rcvtidcnt;
391         tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
392                                    dd->ipath_rcvtidbase +
393                                    porttid * sizeof(*tidbase));
394
395         tidcnt = dd->ipath_rcvtidcnt;
396         limit = sizeof(tidmap) * BITS_PER_BYTE;
397         if (limit > tidcnt)
398                 /* just in case size changes in future */
399                 limit = tidcnt;
400         tid = find_first_bit(tidmap, limit);
401         ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
402                    "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
403                    limit, tid, porttid);
404         for (cnt = 0; tid < limit; tid++) {
405                 /*
406                  * small optimization; if we detect a run of 3 or so without
407                  * any set, use find_first_bit again.  That's mainly to
408                  * accelerate the case where we wrapped, so we have some at
409                  * the beginning, and some at the end, and a big gap
410                  * in the middle.
411                  */
412                 if (!test_bit(tid, tidmap))
413                         continue;
414                 cnt++;
415                 if (dd->ipath_pageshadow[porttid + tid]) {
416                         ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
417                                    pd->port_pid, tid);
418                         dd->ipath_f_put_tid(dd, &tidbase[tid], 1,
419                                             dd->ipath_tidinvalid);
420                         ipath_release_user_pages(
421                                 &dd->ipath_pageshadow[porttid + tid], 1);
422                         dd->ipath_pageshadow[porttid + tid] = NULL;
423                         ipath_stats.sps_pageunlocks++;
424                 } else
425                         ipath_dbg("Unused tid %u, ignoring\n", tid);
426         }
427         if (cnt != ti->tidcnt)
428                 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
429                           ti->tidcnt, cnt);
430 done:
431         if (ret)
432                 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
433                           ti->tidcnt, -ret);
434         return ret;
435 }
436
437 /**
438  * ipath_set_part_key - set a partition key
439  * @pd: the port
440  * @key: the key
441  *
442  * We can have up to 4 active at a time (other than the default, which is
443  * always allowed).  This is somewhat tricky, since multiple ports may set
444  * the same key, so we reference count them, and clean up at exit.  All 4
445  * partition keys are packed into a single infinipath register.  It's an
446  * error for a process to set the same pkey multiple times.  We provide no
447  * mechanism to de-allocate a pkey at this time, we may eventually need to
448  * do that.  I've used the atomic operations, and no locking, and only make
449  * a single pass through what's available.  This should be more than
450  * adequate for some time. I'll think about spinlocks or the like if and as
451  * it's necessary.
452  */
453 static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
454 {
455         struct ipath_devdata *dd = pd->port_dd;
456         int i, any = 0, pidx = -1;
457         u16 lkey = key & 0x7FFF;
458         int ret;
459
460         if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) {
461                 /* nothing to do; this key always valid */
462                 ret = 0;
463                 goto bail;
464         }
465
466         ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
467                    "%hx:%x %hx:%x %hx:%x %hx:%x\n",
468                    pd->port_port, key, dd->ipath_pkeys[0],
469                    atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
470                    atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
471                    atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
472                    atomic_read(&dd->ipath_pkeyrefs[3]));
473
474         if (!lkey) {
475                 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
476                            pd->port_port);
477                 ret = -EINVAL;
478                 goto bail;
479         }
480
481         /*
482          * Set the full membership bit, because it has to be
483          * set in the register or the packet, and it seems
484          * cleaner to set in the register than to force all
485          * callers to set it. (see bug 4331)
486          */
487         key |= 0x8000;
488
489         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
490                 if (!pd->port_pkeys[i] && pidx == -1)
491                         pidx = i;
492                 if (pd->port_pkeys[i] == key) {
493                         ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
494                                    "(%x) more than once\n",
495                                    pd->port_port, key);
496                         ret = -EEXIST;
497                         goto bail;
498                 }
499         }
500         if (pidx == -1) {
501                 ipath_dbg("All pkeys for port %u already in use, "
502                           "can't set %x\n", pd->port_port, key);
503                 ret = -EBUSY;
504                 goto bail;
505         }
506         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
507                 if (!dd->ipath_pkeys[i]) {
508                         any++;
509                         continue;
510                 }
511                 if (dd->ipath_pkeys[i] == key) {
512                         atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
513
514                         if (atomic_inc_return(pkrefs) > 1) {
515                                 pd->port_pkeys[pidx] = key;
516                                 ipath_cdbg(VERBOSE, "p%u set key %x "
517                                            "matches #%d, count now %d\n",
518                                            pd->port_port, key, i,
519                                            atomic_read(pkrefs));
520                                 ret = 0;
521                                 goto bail;
522                         } else {
523                                 /*
524                                  * lost race, decrement count, catch below
525                                  */
526                                 atomic_dec(pkrefs);
527                                 ipath_cdbg(VERBOSE, "Lost race, count was "
528                                            "0, after dec, it's %d\n",
529                                            atomic_read(pkrefs));
530                                 any++;
531                         }
532                 }
533                 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
534                         /*
535                          * It makes no sense to have both the limited and
536                          * full membership PKEY set at the same time since
537                          * the unlimited one will disable the limited one.
538                          */
539                         ret = -EEXIST;
540                         goto bail;
541                 }
542         }
543         if (!any) {
544                 ipath_dbg("port %u, all pkeys already in use, "
545                           "can't set %x\n", pd->port_port, key);
546                 ret = -EBUSY;
547                 goto bail;
548         }
549         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
550                 if (!dd->ipath_pkeys[i] &&
551                     atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
552                         u64 pkey;
553
554                         /* for ipathstats, etc. */
555                         ipath_stats.sps_pkeys[i] = lkey;
556                         pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
557                         pkey =
558                                 (u64) dd->ipath_pkeys[0] |
559                                 ((u64) dd->ipath_pkeys[1] << 16) |
560                                 ((u64) dd->ipath_pkeys[2] << 32) |
561                                 ((u64) dd->ipath_pkeys[3] << 48);
562                         ipath_cdbg(PROC, "p%u set key %x in #%d, "
563                                    "portidx %d, new pkey reg %llx\n",
564                                    pd->port_port, key, i, pidx,
565                                    (unsigned long long) pkey);
566                         ipath_write_kreg(
567                                 dd, dd->ipath_kregs->kr_partitionkey, pkey);
568
569                         ret = 0;
570                         goto bail;
571                 }
572         }
573         ipath_dbg("port %u, all pkeys already in use 2nd pass, "
574                   "can't set %x\n", pd->port_port, key);
575         ret = -EBUSY;
576
577 bail:
578         return ret;
579 }
580
581 /**
582  * ipath_manage_rcvq - manage a port's receive queue
583  * @pd: the port
584  * @start_stop: action to carry out
585  *
586  * start_stop == 0 disables receive on the port, for use in queue
587  * overflow conditions.  start_stop==1 re-enables, to be used to
588  * re-init the software copy of the head register
589  */
590 static int ipath_manage_rcvq(struct ipath_portdata *pd, int start_stop)
591 {
592         struct ipath_devdata *dd = pd->port_dd;
593         u64 tval;
594
595         ipath_cdbg(PROC, "%sabling rcv for unit %u port %u\n",
596                    start_stop ? "en" : "dis", dd->ipath_unit,
597                    pd->port_port);
598         /* atomically clear receive enable port. */
599         if (start_stop) {
600                 /*
601                  * On enable, force in-memory copy of the tail register to
602                  * 0, so that protocol code doesn't have to worry about
603                  * whether or not the chip has yet updated the in-memory
604                  * copy or not on return from the system call. The chip
605                  * always resets it's tail register back to 0 on a
606                  * transition from disabled to enabled.  This could cause a
607                  * problem if software was broken, and did the enable w/o
608                  * the disable, but eventually the in-memory copy will be
609                  * updated and correct itself, even in the face of software
610                  * bugs.
611                  */
612                 *pd->port_rcvhdrtail_kvaddr = 0;
613                 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
614                         &dd->ipath_rcvctrl);
615         } else
616                 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
617                           &dd->ipath_rcvctrl);
618         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
619                          dd->ipath_rcvctrl);
620         /* now be sure chip saw it before we return */
621         tval = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
622         if (start_stop) {
623                 /*
624                  * And try to be sure that tail reg update has happened too.
625                  * This should in theory interlock with the RXE changes to
626                  * the tail register.  Don't assign it to the tail register
627                  * in memory copy, since we could overwrite an update by the
628                  * chip if we did.
629                  */
630                 tval = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
631         }
632         /* always; new head should be equal to new tail; see above */
633         return 0;
634 }
635
636 static void ipath_clean_part_key(struct ipath_portdata *pd,
637                                  struct ipath_devdata *dd)
638 {
639         int i, j, pchanged = 0;
640         u64 oldpkey;
641
642         /* for debugging only */
643         oldpkey = (u64) dd->ipath_pkeys[0] |
644                 ((u64) dd->ipath_pkeys[1] << 16) |
645                 ((u64) dd->ipath_pkeys[2] << 32) |
646                 ((u64) dd->ipath_pkeys[3] << 48);
647
648         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
649                 if (!pd->port_pkeys[i])
650                         continue;
651                 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
652                            pd->port_pkeys[i]);
653                 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
654                         /* check for match independent of the global bit */
655                         if ((dd->ipath_pkeys[j] & 0x7fff) !=
656                             (pd->port_pkeys[i] & 0x7fff))
657                                 continue;
658                         if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
659                                 ipath_cdbg(VERBOSE, "p%u clear key "
660                                            "%x matches #%d\n",
661                                            pd->port_port,
662                                            pd->port_pkeys[i], j);
663                                 ipath_stats.sps_pkeys[j] =
664                                         dd->ipath_pkeys[j] = 0;
665                                 pchanged++;
666                         }
667                         else ipath_cdbg(
668                                 VERBOSE, "p%u key %x matches #%d, "
669                                 "but ref still %d\n", pd->port_port,
670                                 pd->port_pkeys[i], j,
671                                 atomic_read(&dd->ipath_pkeyrefs[j]));
672                         break;
673                 }
674                 pd->port_pkeys[i] = 0;
675         }
676         if (pchanged) {
677                 u64 pkey = (u64) dd->ipath_pkeys[0] |
678                         ((u64) dd->ipath_pkeys[1] << 16) |
679                         ((u64) dd->ipath_pkeys[2] << 32) |
680                         ((u64) dd->ipath_pkeys[3] << 48);
681                 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
682                            "new pkey reg %llx\n", pd->port_port,
683                            (unsigned long long) oldpkey,
684                            (unsigned long long) pkey);
685                 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
686                                  pkey);
687         }
688 }
689
690 /**
691  * ipath_create_user_egr - allocate eager TID buffers
692  * @pd: the port to allocate TID buffers for
693  *
694  * This routine is now quite different for user and kernel, because
695  * the kernel uses skb's, for the accelerated network performance
696  * This is the user port version
697  *
698  * Allocate the eager TID buffers and program them into infinipath
699  * They are no longer completely contiguous, we do multiple allocation
700  * calls.
701  */
702 static int ipath_create_user_egr(struct ipath_portdata *pd)
703 {
704         struct ipath_devdata *dd = pd->port_dd;
705         unsigned e, egrcnt, alloced, egrperchunk, chunk, egrsize, egroff;
706         size_t size;
707         int ret;
708         gfp_t gfp_flags;
709
710         /*
711          * GFP_USER, but without GFP_FS, so buffer cache can be
712          * coalesced (we hope); otherwise, even at order 4,
713          * heavy filesystem activity makes these fail, and we can
714          * use compound pages.
715          */
716         gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
717
718         egrcnt = dd->ipath_rcvegrcnt;
719         /* TID number offset for this port */
720         egroff = pd->port_port * egrcnt;
721         egrsize = dd->ipath_rcvegrbufsize;
722         ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
723                    "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
724
725         /*
726          * to avoid wasting a lot of memory, we allocate 32KB chunks of
727          * physically contiguous memory, advance through it until used up
728          * and then allocate more.  Of course, we need memory to store those
729          * extra pointers, now.  Started out with 256KB, but under heavy
730          * memory pressure (creating large files and then copying them over
731          * NFS while doing lots of MPI jobs), we hit some allocation
732          * failures, even though we can sleep...  (2.6.10) Still get
733          * failures at 64K.  32K is the lowest we can go without wasting
734          * additional memory.
735          */
736         size = 0x8000;
737         alloced = ALIGN(egrsize * egrcnt, size);
738         egrperchunk = size / egrsize;
739         chunk = (egrcnt + egrperchunk - 1) / egrperchunk;
740         pd->port_rcvegrbuf_chunks = chunk;
741         pd->port_rcvegrbufs_perchunk = egrperchunk;
742         pd->port_rcvegrbuf_size = size;
743         pd->port_rcvegrbuf = vmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]));
744         if (!pd->port_rcvegrbuf) {
745                 ret = -ENOMEM;
746                 goto bail;
747         }
748         pd->port_rcvegrbuf_phys =
749                 vmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]));
750         if (!pd->port_rcvegrbuf_phys) {
751                 ret = -ENOMEM;
752                 goto bail_rcvegrbuf;
753         }
754         for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
755
756                 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
757                         &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
758                         gfp_flags);
759
760                 if (!pd->port_rcvegrbuf[e]) {
761                         ret = -ENOMEM;
762                         goto bail_rcvegrbuf_phys;
763                 }
764         }
765
766         pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
767
768         for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
769                 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
770                 unsigned i;
771
772                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
773                         dd->ipath_f_put_tid(dd, e + egroff +
774                                             (u64 __iomem *)
775                                             ((char __iomem *)
776                                              dd->ipath_kregbase +
777                                              dd->ipath_rcvegrbase), 0, pa);
778                         pa += egrsize;
779                 }
780                 cond_resched(); /* don't hog the cpu */
781         }
782
783         ret = 0;
784         goto bail;
785
786 bail_rcvegrbuf_phys:
787         for (e = 0; e < pd->port_rcvegrbuf_chunks &&
788                 pd->port_rcvegrbuf[e]; e++) {
789                 dma_free_coherent(&dd->pcidev->dev, size,
790                                   pd->port_rcvegrbuf[e],
791                                   pd->port_rcvegrbuf_phys[e]);
792
793         }
794         vfree(pd->port_rcvegrbuf_phys);
795         pd->port_rcvegrbuf_phys = NULL;
796 bail_rcvegrbuf:
797         vfree(pd->port_rcvegrbuf);
798         pd->port_rcvegrbuf = NULL;
799 bail:
800         return ret;
801 }
802
803 static int ipath_do_user_init(struct ipath_portdata *pd,
804                               const struct ipath_user_info *uinfo)
805 {
806         int ret = 0;
807         struct ipath_devdata *dd = pd->port_dd;
808         u32 head32;
809
810         /* for now, if major version is different, bail */
811         if ((uinfo->spu_userversion >> 16) != IPATH_USER_SWMAJOR) {
812                 dev_info(&dd->pcidev->dev,
813                          "User major version %d not same as driver "
814                          "major %d\n", uinfo->spu_userversion >> 16,
815                          IPATH_USER_SWMAJOR);
816                 ret = -ENODEV;
817                 goto done;
818         }
819
820         if ((uinfo->spu_userversion & 0xffff) != IPATH_USER_SWMINOR)
821                 ipath_dbg("User minor version %d not same as driver "
822                           "minor %d\n", uinfo->spu_userversion & 0xffff,
823                           IPATH_USER_SWMINOR);
824
825         if (uinfo->spu_rcvhdrsize) {
826                 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
827                 if (ret)
828                         goto done;
829         }
830
831         /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
832
833         /* for right now, kernel piobufs are at end, so port 1 is at 0 */
834         pd->port_piobufs = dd->ipath_piobufbase +
835                 dd->ipath_pbufsport * (pd->port_port -
836                                        1) * dd->ipath_palign;
837         ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n",
838                    pd->port_port, pd->port_piobufs);
839
840         /*
841          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
842          * array for time being.  If pd->port_port > chip-supported,
843          * we need to do extra stuff here to handle by handling overflow
844          * through port 0, someday
845          */
846         ret = ipath_create_rcvhdrq(dd, pd);
847         if (!ret)
848                 ret = ipath_create_user_egr(pd);
849         if (ret)
850                 goto done;
851
852         /*
853          * set the eager head register for this port to the current values
854          * of the tail pointers, since we don't know if they were
855          * updated on last use of the port.
856          */
857         head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
858         ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
859         dd->ipath_lastegrheads[pd->port_port] = -1;
860         dd->ipath_lastrcvhdrqtails[pd->port_port] = -1;
861         ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n",
862                 pd->port_port, head32);
863         pd->port_tidcursor = 0; /* start at beginning after open */
864         /*
865          * now enable the port; the tail registers will be written to memory
866          * by the chip as soon as it sees the write to
867          * dd->ipath_kregs->kr_rcvctrl.  The update only happens on
868          * transition from 0 to 1, so clear it first, then set it as part of
869          * enabling the port.  This will (very briefly) affect any other
870          * open ports, but it shouldn't be long enough to be an issue.
871          * We explictly set the in-memory copy to 0 beforehand, so we don't
872          * have to wait to be sure the DMA update has happened.
873          */
874         *pd->port_rcvhdrtail_kvaddr = 0ULL;
875         set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
876                 &dd->ipath_rcvctrl);
877         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
878                          dd->ipath_rcvctrl & ~INFINIPATH_R_TAILUPD);
879         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
880                          dd->ipath_rcvctrl);
881 done:
882         return ret;
883 }
884
885
886 /* common code for the mappings on dma_alloc_coherent mem */
887 static int ipath_mmap_mem(struct vm_area_struct *vma,
888                              struct ipath_portdata *pd, unsigned len,
889                              int write_ok, dma_addr_t addr, char *what)
890 {
891         struct ipath_devdata *dd = pd->port_dd;
892         unsigned pfn = (unsigned long)addr >> PAGE_SHIFT;
893         int ret;
894
895         if ((vma->vm_end - vma->vm_start) > len) {
896                 dev_info(&dd->pcidev->dev,
897                          "FAIL on %s: len %lx > %x\n", what,
898                          vma->vm_end - vma->vm_start, len);
899                 ret = -EFAULT;
900                 goto bail;
901         }
902
903         if (!write_ok) {
904                 if (vma->vm_flags & VM_WRITE) {
905                         dev_info(&dd->pcidev->dev,
906                                  "%s must be mapped readonly\n", what);
907                         ret = -EPERM;
908                         goto bail;
909                 }
910
911                 /* don't allow them to later change with mprotect */
912                 vma->vm_flags &= ~VM_MAYWRITE;
913         }
914
915         ret = remap_pfn_range(vma, vma->vm_start, pfn,
916                               len, vma->vm_page_prot);
917         if (ret)
918                 dev_info(&dd->pcidev->dev,
919                          "%s port%u mmap of %lx, %x bytes r%c failed: %d\n",
920                          what, pd->port_port, (unsigned long)addr, len,
921                          write_ok?'w':'o', ret);
922         else
923                 ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes r%c\n",
924                         what, pd->port_port, (unsigned long)addr, len,
925                          write_ok?'w':'o');
926 bail:
927         return ret;
928 }
929
930 static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
931                      u64 ureg)
932 {
933         unsigned long phys;
934         int ret;
935
936         /*
937          * This is real hardware, so use io_remap.  This is the mechanism
938          * for the user process to update the head registers for their port
939          * in the chip.
940          */
941         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
942                 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
943                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
944                 ret = -EFAULT;
945         } else {
946                 phys = dd->ipath_physaddr + ureg;
947                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
948
949                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
950                 ret = io_remap_pfn_range(vma, vma->vm_start,
951                                          phys >> PAGE_SHIFT,
952                                          vma->vm_end - vma->vm_start,
953                                          vma->vm_page_prot);
954         }
955         return ret;
956 }
957
958 static int mmap_piobufs(struct vm_area_struct *vma,
959                         struct ipath_devdata *dd,
960                         struct ipath_portdata *pd)
961 {
962         unsigned long phys;
963         int ret;
964
965         /*
966          * When we map the PIO buffers in the chip, we want to map them as
967          * writeonly, no read possible.   This prevents access to previous
968          * process data, and catches users who might try to read the i/o
969          * space due to a bug.
970          */
971         if ((vma->vm_end - vma->vm_start) >
972             (dd->ipath_pbufsport * dd->ipath_palign)) {
973                 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
974                          "reqlen %lx > PAGE\n",
975                          vma->vm_end - vma->vm_start);
976                 ret = -EFAULT;
977                 goto bail;
978         }
979
980         phys = dd->ipath_physaddr + pd->port_piobufs;
981
982         /*
983          * Don't mark this as non-cached, or we don't get the
984          * write combining behavior we want on the PIO buffers!
985          */
986
987 #if defined(__powerpc__)
988         /* There isn't a generic way to specify writethrough mappings */
989         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
990         pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
991         pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
992 #endif
993
994         /*
995          * don't allow them to later change to readable with mprotect (for when
996          * not initially mapped readable, as is normally the case)
997          */
998         vma->vm_flags &= ~VM_MAYREAD;
999         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1000
1001         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1002                                  vma->vm_end - vma->vm_start,
1003                                  vma->vm_page_prot);
1004 bail:
1005         return ret;
1006 }
1007
1008 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1009                            struct ipath_portdata *pd)
1010 {
1011         struct ipath_devdata *dd = pd->port_dd;
1012         unsigned long start, size;
1013         size_t total_size, i;
1014         dma_addr_t *phys;
1015         int ret;
1016
1017         size = pd->port_rcvegrbuf_size;
1018         total_size = pd->port_rcvegrbuf_chunks * size;
1019         if ((vma->vm_end - vma->vm_start) > total_size) {
1020                 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1021                          "reqlen %lx > actual %lx\n",
1022                          vma->vm_end - vma->vm_start,
1023                          (unsigned long) total_size);
1024                 ret = -EFAULT;
1025                 goto bail;
1026         }
1027
1028         if (vma->vm_flags & VM_WRITE) {
1029                 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1030                          "writable (flags=%lx)\n", vma->vm_flags);
1031                 ret = -EPERM;
1032                 goto bail;
1033         }
1034         /* don't allow them to later change to writeable with mprotect */
1035         vma->vm_flags &= ~VM_MAYWRITE;
1036
1037         start = vma->vm_start;
1038         phys = pd->port_rcvegrbuf_phys;
1039
1040         for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1041                 ret = remap_pfn_range(vma, start, phys[i] >> PAGE_SHIFT,
1042                                       size, vma->vm_page_prot);
1043                 if (ret < 0)
1044                         goto bail;
1045         }
1046         ret = 0;
1047
1048 bail:
1049         return ret;
1050 }
1051
1052 /**
1053  * ipath_mmap - mmap various structures into user space
1054  * @fp: the file pointer
1055  * @vma: the VM area
1056  *
1057  * We use this to have a shared buffer between the kernel and the user code
1058  * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1059  * buffers in the chip.  We have the open and close entries so we can bump
1060  * the ref count and keep the driver from being unloaded while still mapped.
1061  */
1062 static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1063 {
1064         struct ipath_portdata *pd;
1065         struct ipath_devdata *dd;
1066         u64 pgaddr, ureg;
1067         int ret;
1068
1069         pd = port_fp(fp);
1070         dd = pd->port_dd;
1071
1072         /*
1073          * This is the ipath_do_user_init() code, mapping the shared buffers
1074          * into the user process. The address referred to by vm_pgoff is the
1075          * virtual, not physical, address; we only do one mmap for each
1076          * space mapped.
1077          */
1078         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1079
1080         /*
1081          * Must fit in 40 bits for our hardware; some checked elsewhere,
1082          * but we'll be paranoid.  Check for 0 is mostly in case one of the
1083          * allocations failed, but user called mmap anyway.   We want to catch
1084          * that before it can match.
1085          */
1086         if (!pgaddr || pgaddr >= (1ULL<<40))  {
1087                 ipath_dev_err(dd, "Bad phys addr %llx, start %lx, end %lx\n",
1088                         (unsigned long long)pgaddr, vma->vm_start, vma->vm_end);
1089                 return -EINVAL;
1090         }
1091
1092         /* just the offset of the port user registers, not physical addr */
1093         ureg = dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
1094
1095         ipath_cdbg(MM, "ushare: pgaddr %llx vm_start=%lx, vmlen %lx\n",
1096                    (unsigned long long) pgaddr, vma->vm_start,
1097                    vma->vm_end - vma->vm_start);
1098
1099         if (vma->vm_start & (PAGE_SIZE-1)) {
1100                 ipath_dev_err(dd,
1101                         "vm_start not aligned: %lx, end=%lx phys %lx\n",
1102                         vma->vm_start, vma->vm_end, (unsigned long)pgaddr);
1103                 ret = -EINVAL;
1104         }
1105         else if (pgaddr == ureg)
1106                 ret = mmap_ureg(vma, dd, ureg);
1107         else if (pgaddr == pd->port_piobufs)
1108                 ret = mmap_piobufs(vma, dd, pd);
1109         else if (pgaddr == (u64) pd->port_rcvegr_phys)
1110                 ret = mmap_rcvegrbufs(vma, pd);
1111         else if (pgaddr == (u64) pd->port_rcvhdrq_phys) {
1112                 /*
1113                  * The rcvhdrq itself; readonly except on HT-400 (so have
1114                  * to allow writable mapping), multiple pages, contiguous
1115                  * from an i/o perspective.
1116                  */
1117                 unsigned total_size =
1118                         ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize
1119                            * sizeof(u32), PAGE_SIZE);
1120                 ret = ipath_mmap_mem(vma, pd, total_size, 1,
1121                                      pd->port_rcvhdrq_phys,
1122                                      "rcvhdrq");
1123         }
1124         else if (pgaddr == (u64)pd->port_rcvhdrqtailaddr_phys)
1125                 /* in-memory copy of rcvhdrq tail register */
1126                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1127                                      pd->port_rcvhdrqtailaddr_phys,
1128                                      "rcvhdrq tail");
1129         else if (pgaddr == dd->ipath_pioavailregs_phys)
1130                 /* in-memory copy of pioavail registers */
1131                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1132                                      dd->ipath_pioavailregs_phys,
1133                                      "pioavail registers");
1134         else
1135                 ret = -EINVAL;
1136
1137         vma->vm_private_data = NULL;
1138
1139         if (ret < 0)
1140                 dev_info(&dd->pcidev->dev,
1141                          "Failure %d on addr %lx, off %lx\n",
1142                          -ret, vma->vm_start, vma->vm_pgoff);
1143
1144         return ret;
1145 }
1146
1147 static unsigned int ipath_poll(struct file *fp,
1148                                struct poll_table_struct *pt)
1149 {
1150         struct ipath_portdata *pd;
1151         u32 head, tail;
1152         int bit;
1153         struct ipath_devdata *dd;
1154
1155         pd = port_fp(fp);
1156         dd = pd->port_dd;
1157
1158         bit = pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT;
1159         set_bit(bit, &dd->ipath_rcvctrl);
1160
1161         /*
1162          * Before blocking, make sure that head is still == tail,
1163          * reading from the chip, so we can be sure the interrupt
1164          * enable has made it to the chip.  If not equal, disable
1165          * interrupt again and return immediately.  This avoids races,
1166          * and the overhead of the chip read doesn't matter much at
1167          * this point, since we are waiting for something anyway.
1168          */
1169
1170         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1171                          dd->ipath_rcvctrl);
1172
1173         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1174         tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1175
1176         if (tail == head) {
1177                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1178                 if(dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1179                         (void)ipath_write_ureg(dd, ur_rcvhdrhead,
1180                                                dd->ipath_rhdrhead_intr_off
1181                                                | head, pd->port_port);
1182                 poll_wait(fp, &pd->port_wait, pt);
1183
1184                 if (test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) {
1185                         /* timed out, no packets received */
1186                         clear_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1187                         pd->port_rcvwait_to++;
1188                 }
1189         }
1190         else {
1191                 /* it's already happened; don't do wait_event overhead */
1192                 pd->port_rcvnowait++;
1193         }
1194
1195         clear_bit(bit, &dd->ipath_rcvctrl);
1196         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1197                          dd->ipath_rcvctrl);
1198
1199         return 0;
1200 }
1201
1202 static int try_alloc_port(struct ipath_devdata *dd, int port,
1203                           struct file *fp)
1204 {
1205         int ret;
1206
1207         if (!dd->ipath_pd[port]) {
1208                 void *p, *ptmp;
1209
1210                 p = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1211
1212                 /*
1213                  * Allocate memory for use in ipath_tid_update() just once
1214                  * at open, not per call.  Reduces cost of expected send
1215                  * setup.
1216                  */
1217                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1218                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1219                                GFP_KERNEL);
1220                 if (!p || !ptmp) {
1221                         ipath_dev_err(dd, "Unable to allocate portdata "
1222                                       "memory, failing open\n");
1223                         ret = -ENOMEM;
1224                         kfree(p);
1225                         kfree(ptmp);
1226                         goto bail;
1227                 }
1228                 dd->ipath_pd[port] = p;
1229                 dd->ipath_pd[port]->port_port = port;
1230                 dd->ipath_pd[port]->port_dd = dd;
1231                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1232                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1233         }
1234         if (!dd->ipath_pd[port]->port_cnt) {
1235                 dd->ipath_pd[port]->port_cnt = 1;
1236                 fp->private_data = (void *) dd->ipath_pd[port];
1237                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1238                            current->comm, current->pid, dd->ipath_unit,
1239                            port);
1240                 dd->ipath_pd[port]->port_pid = current->pid;
1241                 strncpy(dd->ipath_pd[port]->port_comm, current->comm,
1242                         sizeof(dd->ipath_pd[port]->port_comm));
1243                 ipath_stats.sps_ports++;
1244                 ret = 0;
1245                 goto bail;
1246         }
1247         ret = -EBUSY;
1248
1249 bail:
1250         return ret;
1251 }
1252
1253 static inline int usable(struct ipath_devdata *dd)
1254 {
1255         return dd &&
1256                 (dd->ipath_flags & IPATH_PRESENT) &&
1257                 dd->ipath_kregbase &&
1258                 dd->ipath_lid &&
1259                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1260                                      | IPATH_LINKUNK));
1261 }
1262
1263 static int find_free_port(int unit, struct file *fp)
1264 {
1265         struct ipath_devdata *dd = ipath_lookup(unit);
1266         int ret, i;
1267
1268         if (!dd) {
1269                 ret = -ENODEV;
1270                 goto bail;
1271         }
1272
1273         if (!usable(dd)) {
1274                 ret = -ENETDOWN;
1275                 goto bail;
1276         }
1277
1278         for (i = 0; i < dd->ipath_cfgports; i++) {
1279                 ret = try_alloc_port(dd, i, fp);
1280                 if (ret != -EBUSY)
1281                         goto bail;
1282         }
1283         ret = -EBUSY;
1284
1285 bail:
1286         return ret;
1287 }
1288
1289 static int find_best_unit(struct file *fp)
1290 {
1291         int ret = 0, i, prefunit = -1, devmax;
1292         int maxofallports, npresent, nup;
1293         int ndev;
1294
1295         (void) ipath_count_units(&npresent, &nup, &maxofallports);
1296
1297         /*
1298          * This code is present to allow a knowledgeable person to
1299          * specify the layout of processes to processors before opening
1300          * this driver, and then we'll assign the process to the "closest"
1301          * HT-400 to that processor (we assume reasonable connectivity,
1302          * for now).  This code assumes that if affinity has been set
1303          * before this point, that at most one cpu is set; for now this
1304          * is reasonable.  I check for both cpus_empty() and cpus_full(),
1305          * in case some kernel variant sets none of the bits when no
1306          * affinity is set.  2.6.11 and 12 kernels have all present
1307          * cpus set.  Some day we'll have to fix it up further to handle
1308          * a cpu subset.  This algorithm fails for two HT-400's connected
1309          * in tunnel fashion.  Eventually this needs real topology
1310          * information.  There may be some issues with dual core numbering
1311          * as well.  This needs more work prior to release.
1312          */
1313         if (!cpus_empty(current->cpus_allowed) &&
1314             !cpus_full(current->cpus_allowed)) {
1315                 int ncpus = num_online_cpus(), curcpu = -1;
1316                 for (i = 0; i < ncpus; i++)
1317                         if (cpu_isset(i, current->cpus_allowed)) {
1318                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1319                                            "cpu %d\n", current->comm,
1320                                            current->pid, i);
1321                                 curcpu = i;
1322                         }
1323                 if (curcpu != -1) {
1324                         if (npresent) {
1325                                 prefunit = curcpu / (ncpus / npresent);
1326                                 ipath_dbg("%s[%u] %d chips, %d cpus, "
1327                                           "%d cpus/chip, select unit %d\n",
1328                                           current->comm, current->pid,
1329                                           npresent, ncpus, ncpus / npresent,
1330                                           prefunit);
1331                         }
1332                 }
1333         }
1334
1335         /*
1336          * user ports start at 1, kernel port is 0
1337          * For now, we do round-robin access across all chips
1338          */
1339
1340         if (prefunit != -1)
1341                 devmax = prefunit + 1;
1342         else
1343                 devmax = ipath_count_units(NULL, NULL, NULL);
1344 recheck:
1345         for (i = 1; i < maxofallports; i++) {
1346                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1347                      ndev++) {
1348                         struct ipath_devdata *dd = ipath_lookup(ndev);
1349
1350                         if (!usable(dd))
1351                                 continue; /* can't use this unit */
1352                         if (i >= dd->ipath_cfgports)
1353                                 /*
1354                                  * Maxed out on users of this unit. Try
1355                                  * next.
1356                                  */
1357                                 continue;
1358                         ret = try_alloc_port(dd, i, fp);
1359                         if (!ret)
1360                                 goto done;
1361                 }
1362         }
1363
1364         if (npresent) {
1365                 if (nup == 0) {
1366                         ret = -ENETDOWN;
1367                         ipath_dbg("No ports available (none initialized "
1368                                   "and ready)\n");
1369                 } else {
1370                         if (prefunit > 0) {
1371                                 /* if started above 0, retry from 0 */
1372                                 ipath_cdbg(PROC,
1373                                            "%s[%u] no ports on prefunit "
1374                                            "%d, clear and re-check\n",
1375                                            current->comm, current->pid,
1376                                            prefunit);
1377                                 devmax = ipath_count_units(NULL, NULL,
1378                                                            NULL);
1379                                 prefunit = -1;
1380                                 goto recheck;
1381                         }
1382                         ret = -EBUSY;
1383                         ipath_dbg("No ports available\n");
1384                 }
1385         } else {
1386                 ret = -ENXIO;
1387                 ipath_dbg("No boards found\n");
1388         }
1389
1390 done:
1391         return ret;
1392 }
1393
1394 static int ipath_open(struct inode *in, struct file *fp)
1395 {
1396         int ret, user_minor;
1397
1398         mutex_lock(&ipath_mutex);
1399
1400         user_minor = iminor(in) - IPATH_USER_MINOR_BASE;
1401         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1402                    (long)in->i_rdev, user_minor);
1403
1404         if (user_minor)
1405                 ret = find_free_port(user_minor - 1, fp);
1406         else
1407                 ret = find_best_unit(fp);
1408
1409         mutex_unlock(&ipath_mutex);
1410         return ret;
1411 }
1412
1413 /**
1414  * unlock_exptid - unlock any expected TID entries port still had in use
1415  * @pd: port
1416  *
1417  * We don't actually update the chip here, because we do a bulk update
1418  * below, using ipath_f_clear_tids.
1419  */
1420 static void unlock_expected_tids(struct ipath_portdata *pd)
1421 {
1422         struct ipath_devdata *dd = pd->port_dd;
1423         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
1424         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
1425
1426         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
1427                    pd->port_port);
1428         for (i = port_tidbase; i < maxtid; i++) {
1429                 if (!dd->ipath_pageshadow[i])
1430                         continue;
1431
1432                 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i],
1433                                                   1);
1434                 dd->ipath_pageshadow[i] = NULL;
1435                 cnt++;
1436                 ipath_stats.sps_pageunlocks++;
1437         }
1438         if (cnt)
1439                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
1440                            pd->port_port, cnt);
1441
1442         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
1443                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
1444                            (unsigned long long) ipath_stats.sps_pagelocks,
1445                            (unsigned long long)
1446                            ipath_stats.sps_pageunlocks);
1447 }
1448
1449 static int ipath_close(struct inode *in, struct file *fp)
1450 {
1451         int ret = 0;
1452         struct ipath_portdata *pd;
1453         struct ipath_devdata *dd;
1454         unsigned port;
1455
1456         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
1457                    (long)in->i_rdev, fp->private_data);
1458
1459         mutex_lock(&ipath_mutex);
1460
1461         pd = port_fp(fp);
1462         port = pd->port_port;
1463         fp->private_data = NULL;
1464         dd = pd->port_dd;
1465
1466         if (pd->port_hdrqfull) {
1467                 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
1468                            "during run\n", pd->port_comm, pd->port_pid,
1469                            pd->port_hdrqfull);
1470                 pd->port_hdrqfull = 0;
1471         }
1472
1473         if (pd->port_rcvwait_to || pd->port_piowait_to
1474             || pd->port_rcvnowait || pd->port_pionowait) {
1475                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
1476                            "%u rcv %u, pio already\n",
1477                            pd->port_port, pd->port_rcvwait_to,
1478                            pd->port_piowait_to, pd->port_rcvnowait,
1479                            pd->port_pionowait);
1480                 pd->port_rcvwait_to = pd->port_piowait_to =
1481                         pd->port_rcvnowait = pd->port_pionowait = 0;
1482         }
1483         if (pd->port_flag) {
1484                 ipath_dbg("port %u port_flag still set to 0x%lx\n",
1485                           pd->port_port, pd->port_flag);
1486                 pd->port_flag = 0;
1487         }
1488
1489         if (dd->ipath_kregbase) {
1490                 int i;
1491                 /* atomically clear receive enable port. */
1492                 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
1493                           &dd->ipath_rcvctrl);
1494                 ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
1495                         dd->ipath_rcvctrl);
1496                 /* and read back from chip to be sure that nothing
1497                  * else is in flight when we do the rest */
1498                 (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1499
1500                 /* clean up the pkeys for this port user */
1501                 ipath_clean_part_key(pd, dd);
1502
1503
1504                 /*
1505                  * be paranoid, and never write 0's to these, just use an
1506                  * unused part of the port 0 tail page.  Of course,
1507                  * rcvhdraddr points to a large chunk of memory, so this
1508                  * could still trash things, but at least it won't trash
1509                  * page 0, and by disabling the port, it should stop "soon",
1510                  * even if a packet or two is in already in flight after we
1511                  * disabled the port.
1512                  */
1513                 ipath_write_kreg_port(dd,
1514                         dd->ipath_kregs->kr_rcvhdrtailaddr, port,
1515                         dd->ipath_dummy_hdrq_phys);
1516                 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
1517                         pd->port_port, dd->ipath_dummy_hdrq_phys);
1518
1519                 i = dd->ipath_pbufsport * (port - 1);
1520                 ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
1521
1522                 if (dd->ipath_pageshadow)
1523                         unlock_expected_tids(pd);
1524                 ipath_stats.sps_ports--;
1525                 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
1526                            pd->port_comm, pd->port_pid,
1527                            dd->ipath_unit, port);
1528
1529                 dd->ipath_f_clear_tids(dd, pd->port_port);
1530         }
1531
1532         pd->port_cnt = 0;
1533         pd->port_pid = 0;
1534
1535         dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */
1536         mutex_unlock(&ipath_mutex);
1537         ipath_free_pddata(dd, pd); /* after releasing the mutex */
1538
1539         return ret;
1540 }
1541
1542 static int ipath_port_info(struct ipath_portdata *pd,
1543                            struct ipath_port_info __user *uinfo)
1544 {
1545         struct ipath_port_info info;
1546         int nup;
1547         int ret;
1548
1549         (void) ipath_count_units(NULL, &nup, NULL);
1550         info.num_active = nup;
1551         info.unit = pd->port_dd->ipath_unit;
1552         info.port = pd->port_port;
1553
1554         if (copy_to_user(uinfo, &info, sizeof(info))) {
1555                 ret = -EFAULT;
1556                 goto bail;
1557         }
1558         ret = 0;
1559
1560 bail:
1561         return ret;
1562 }
1563
1564 static ssize_t ipath_write(struct file *fp, const char __user *data,
1565                            size_t count, loff_t *off)
1566 {
1567         const struct ipath_cmd __user *ucmd;
1568         struct ipath_portdata *pd;
1569         const void __user *src;
1570         size_t consumed, copy;
1571         struct ipath_cmd cmd;
1572         ssize_t ret = 0;
1573         void *dest;
1574
1575         if (count < sizeof(cmd.type)) {
1576                 ret = -EINVAL;
1577                 goto bail;
1578         }
1579
1580         ucmd = (const struct ipath_cmd __user *) data;
1581
1582         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1583                 ret = -EFAULT;
1584                 goto bail;
1585         }
1586
1587         consumed = sizeof(cmd.type);
1588
1589         switch (cmd.type) {
1590         case IPATH_CMD_USER_INIT:
1591                 copy = sizeof(cmd.cmd.user_info);
1592                 dest = &cmd.cmd.user_info;
1593                 src = &ucmd->cmd.user_info;
1594                 break;
1595         case IPATH_CMD_RECV_CTRL:
1596                 copy = sizeof(cmd.cmd.recv_ctrl);
1597                 dest = &cmd.cmd.recv_ctrl;
1598                 src = &ucmd->cmd.recv_ctrl;
1599                 break;
1600         case IPATH_CMD_PORT_INFO:
1601                 copy = sizeof(cmd.cmd.port_info);
1602                 dest = &cmd.cmd.port_info;
1603                 src = &ucmd->cmd.port_info;
1604                 break;
1605         case IPATH_CMD_TID_UPDATE:
1606         case IPATH_CMD_TID_FREE:
1607                 copy = sizeof(cmd.cmd.tid_info);
1608                 dest = &cmd.cmd.tid_info;
1609                 src = &ucmd->cmd.tid_info;
1610                 break;
1611         case IPATH_CMD_SET_PART_KEY:
1612                 copy = sizeof(cmd.cmd.part_key);
1613                 dest = &cmd.cmd.part_key;
1614                 src = &ucmd->cmd.part_key;
1615                 break;
1616         default:
1617                 ret = -EINVAL;
1618                 goto bail;
1619         }
1620
1621         if ((count - consumed) < copy) {
1622                 ret = -EINVAL;
1623                 goto bail;
1624         }
1625
1626         if (copy_from_user(dest, src, copy)) {
1627                 ret = -EFAULT;
1628                 goto bail;
1629         }
1630
1631         consumed += copy;
1632         pd = port_fp(fp);
1633
1634         switch (cmd.type) {
1635         case IPATH_CMD_USER_INIT:
1636                 ret = ipath_do_user_init(pd, &cmd.cmd.user_info);
1637                 if (ret < 0)
1638                         goto bail;
1639                 ret = ipath_get_base_info(
1640                         pd, (void __user *) (unsigned long)
1641                         cmd.cmd.user_info.spu_base_info,
1642                         cmd.cmd.user_info.spu_base_info_size);
1643                 break;
1644         case IPATH_CMD_RECV_CTRL:
1645                 ret = ipath_manage_rcvq(pd, cmd.cmd.recv_ctrl);
1646                 break;
1647         case IPATH_CMD_PORT_INFO:
1648                 ret = ipath_port_info(pd,
1649                                       (struct ipath_port_info __user *)
1650                                       (unsigned long) cmd.cmd.port_info);
1651                 break;
1652         case IPATH_CMD_TID_UPDATE:
1653                 ret = ipath_tid_update(pd, &cmd.cmd.tid_info);
1654                 break;
1655         case IPATH_CMD_TID_FREE:
1656                 ret = ipath_tid_free(pd, &cmd.cmd.tid_info);
1657                 break;
1658         case IPATH_CMD_SET_PART_KEY:
1659                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
1660                 break;
1661         }
1662
1663         if (ret >= 0)
1664                 ret = consumed;
1665
1666 bail:
1667         return ret;
1668 }
1669
1670 static struct class *ipath_class;
1671
1672 static int init_cdev(int minor, char *name, struct file_operations *fops,
1673                      struct cdev **cdevp, struct class_device **class_devp)
1674 {
1675         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
1676         struct cdev *cdev = NULL;
1677         struct class_device *class_dev = NULL;
1678         int ret;
1679
1680         cdev = cdev_alloc();
1681         if (!cdev) {
1682                 printk(KERN_ERR IPATH_DRV_NAME
1683                        ": Could not allocate cdev for minor %d, %s\n",
1684                        minor, name);
1685                 ret = -ENOMEM;
1686                 goto done;
1687         }
1688
1689         cdev->owner = THIS_MODULE;
1690         cdev->ops = fops;
1691         kobject_set_name(&cdev->kobj, name);
1692
1693         ret = cdev_add(cdev, dev, 1);
1694         if (ret < 0) {
1695                 printk(KERN_ERR IPATH_DRV_NAME
1696                        ": Could not add cdev for minor %d, %s (err %d)\n",
1697                        minor, name, -ret);
1698                 goto err_cdev;
1699         }
1700
1701         class_dev = class_device_create(ipath_class, NULL, dev, NULL, name);
1702
1703         if (IS_ERR(class_dev)) {
1704                 ret = PTR_ERR(class_dev);
1705                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1706                        "class_dev for minor %d, %s (err %d)\n",
1707                        minor, name, -ret);
1708                 goto err_cdev;
1709         }
1710
1711         goto done;
1712
1713 err_cdev:
1714         cdev_del(cdev);
1715         cdev = NULL;
1716
1717 done:
1718         if (ret >= 0) {
1719                 *cdevp = cdev;
1720                 *class_devp = class_dev;
1721         } else {
1722                 *cdevp = NULL;
1723                 *class_devp = NULL;
1724         }
1725
1726         return ret;
1727 }
1728
1729 int ipath_cdev_init(int minor, char *name, struct file_operations *fops,
1730                     struct cdev **cdevp, struct class_device **class_devp)
1731 {
1732         return init_cdev(minor, name, fops, cdevp, class_devp);
1733 }
1734
1735 static void cleanup_cdev(struct cdev **cdevp,
1736                          struct class_device **class_devp)
1737 {
1738         struct class_device *class_dev = *class_devp;
1739
1740         if (class_dev) {
1741                 class_device_unregister(class_dev);
1742                 *class_devp = NULL;
1743         }
1744
1745         if (*cdevp) {
1746                 cdev_del(*cdevp);
1747                 *cdevp = NULL;
1748         }
1749 }
1750
1751 void ipath_cdev_cleanup(struct cdev **cdevp,
1752                         struct class_device **class_devp)
1753 {
1754         cleanup_cdev(cdevp, class_devp);
1755 }
1756
1757 static struct cdev *wildcard_cdev;
1758 static struct class_device *wildcard_class_dev;
1759
1760 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
1761
1762 static int user_init(void)
1763 {
1764         int ret;
1765
1766         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
1767         if (ret < 0) {
1768                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
1769                        "chrdev region (err %d)\n", -ret);
1770                 goto done;
1771         }
1772
1773         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
1774
1775         if (IS_ERR(ipath_class)) {
1776                 ret = PTR_ERR(ipath_class);
1777                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1778                        "device class (err %d)\n", -ret);
1779                 goto bail;
1780         }
1781
1782         goto done;
1783 bail:
1784         unregister_chrdev_region(dev, IPATH_NMINORS);
1785 done:
1786         return ret;
1787 }
1788
1789 static void user_cleanup(void)
1790 {
1791         if (ipath_class) {
1792                 class_destroy(ipath_class);
1793                 ipath_class = NULL;
1794         }
1795
1796         unregister_chrdev_region(dev, IPATH_NMINORS);
1797 }
1798
1799 static atomic_t user_count = ATOMIC_INIT(0);
1800 static atomic_t user_setup = ATOMIC_INIT(0);
1801
1802 int ipath_user_add(struct ipath_devdata *dd)
1803 {
1804         char name[10];
1805         int ret;
1806
1807         if (atomic_inc_return(&user_count) == 1) {
1808                 ret = user_init();
1809                 if (ret < 0) {
1810                         ipath_dev_err(dd, "Unable to set up user support: "
1811                                       "error %d\n", -ret);
1812                         goto bail;
1813                 }
1814                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
1815                                 &wildcard_class_dev);
1816                 if (ret < 0) {
1817                         ipath_dev_err(dd, "Could not create wildcard "
1818                                       "minor: error %d\n", -ret);
1819                         goto bail_sma;
1820                 }
1821
1822                 atomic_set(&user_setup, 1);
1823         }
1824
1825         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
1826
1827         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
1828                         &dd->user_cdev, &dd->user_class_dev);
1829         if (ret < 0)
1830                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
1831                               dd->ipath_unit + 1, name);
1832
1833         goto bail;
1834
1835 bail_sma:
1836         user_cleanup();
1837 bail:
1838         return ret;
1839 }
1840
1841 void ipath_user_remove(struct ipath_devdata *dd)
1842 {
1843         cleanup_cdev(&dd->user_cdev, &dd->user_class_dev);
1844
1845         if (atomic_dec_return(&user_count) == 0) {
1846                 if (atomic_read(&user_setup) == 0)
1847                         goto bail;
1848
1849                 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
1850                 user_cleanup();
1851
1852                 atomic_set(&user_setup, 0);
1853         }
1854 bail:
1855         return;
1856 }
1857