[PATCH] IB/ipath: update copyrights and other strings to reflect new company name
[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 "ips_common.h"
43 #include "ipath_layer.h"
44
45 static int ipath_open(struct inode *, struct file *);
46 static int ipath_close(struct inode *, struct file *);
47 static ssize_t ipath_write(struct file *, const char __user *, size_t,
48                            loff_t *);
49 static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
50 static int ipath_mmap(struct file *, struct vm_area_struct *);
51
52 static struct file_operations ipath_file_ops = {
53         .owner = THIS_MODULE,
54         .write = ipath_write,
55         .open = ipath_open,
56         .release = ipath_close,
57         .poll = ipath_poll,
58         .mmap = ipath_mmap
59 };
60
61 static int ipath_get_base_info(struct ipath_portdata *pd,
62                                void __user *ubase, size_t ubase_size)
63 {
64         int ret = 0;
65         struct ipath_base_info *kinfo = NULL;
66         struct ipath_devdata *dd = pd->port_dd;
67
68         if (ubase_size < sizeof(*kinfo)) {
69                 ipath_cdbg(PROC,
70                            "Base size %lu, need %lu (version mismatch?)\n",
71                            (unsigned long) ubase_size,
72                            (unsigned long) sizeof(*kinfo));
73                 ret = -EINVAL;
74                 goto bail;
75         }
76
77         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
78         if (kinfo == NULL) {
79                 ret = -ENOMEM;
80                 goto bail;
81         }
82
83         ret = dd->ipath_f_get_base_info(pd, kinfo);
84         if (ret < 0)
85                 goto bail;
86
87         kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
88         kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
89         kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
90         kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
91         /*
92          * have to mmap whole thing
93          */
94         kinfo->spi_rcv_egrbuftotlen =
95                 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
96         kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
97         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
98                 pd->port_rcvegrbuf_chunks;
99         kinfo->spi_tidcnt = dd->ipath_rcvtidcnt;
100         /*
101          * for this use, may be ipath_cfgports summed over all chips that
102          * are are configured and present
103          */
104         kinfo->spi_nports = dd->ipath_cfgports;
105         /* unit (chip/board) our port is on */
106         kinfo->spi_unit = dd->ipath_unit;
107         /* for now, only a single page */
108         kinfo->spi_tid_maxsize = PAGE_SIZE;
109
110         /*
111          * Doing this per port, and based on the skip value, etc.  This has
112          * to be the actual buffer size, since the protocol code treats it
113          * as an array.
114          *
115          * These have to be set to user addresses in the user code via mmap.
116          * These values are used on return to user code for the mmap target
117          * addresses only.  For 32 bit, same 44 bit address problem, so use
118          * the physical address, not virtual.  Before 2.6.11, using the
119          * page_address() macro worked, but in 2.6.11, even that returns the
120          * full 64 bit address (upper bits all 1's).  So far, using the
121          * physical addresses (or chip offsets, for chip mapping) works, but
122          * no doubt some future kernel release will chang that, and we'll be
123          * on to yet another method of dealing with this
124          */
125         kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_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 == (IPS_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
709         egrcnt = dd->ipath_rcvegrcnt;
710         /* TID number offset for this port */
711         egroff = pd->port_port * egrcnt;
712         egrsize = dd->ipath_rcvegrbufsize;
713         ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
714                    "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
715
716         /*
717          * to avoid wasting a lot of memory, we allocate 32KB chunks of
718          * physically contiguous memory, advance through it until used up
719          * and then allocate more.  Of course, we need memory to store those
720          * extra pointers, now.  Started out with 256KB, but under heavy
721          * memory pressure (creating large files and then copying them over
722          * NFS while doing lots of MPI jobs), we hit some allocation
723          * failures, even though we can sleep...  (2.6.10) Still get
724          * failures at 64K.  32K is the lowest we can go without waiting
725          * more memory again.  It seems likely that the coalescing in
726          * free_pages, etc. still has issues (as it has had previously
727          * during 2.6.x development).
728          */
729         size = 0x8000;
730         alloced = ALIGN(egrsize * egrcnt, size);
731         egrperchunk = size / egrsize;
732         chunk = (egrcnt + egrperchunk - 1) / egrperchunk;
733         pd->port_rcvegrbuf_chunks = chunk;
734         pd->port_rcvegrbufs_perchunk = egrperchunk;
735         pd->port_rcvegrbuf_size = size;
736         pd->port_rcvegrbuf = vmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]));
737         if (!pd->port_rcvegrbuf) {
738                 ret = -ENOMEM;
739                 goto bail;
740         }
741         pd->port_rcvegrbuf_phys =
742                 vmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]));
743         if (!pd->port_rcvegrbuf_phys) {
744                 ret = -ENOMEM;
745                 goto bail_rcvegrbuf;
746         }
747         for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
748                 /*
749                  * GFP_USER, but without GFP_FS, so buffer cache can be
750                  * coalesced (we hope); otherwise, even at order 4,
751                  * heavy filesystem activity makes these fail
752                  */
753                 gfp_t gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
754
755                 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
756                         &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
757                         gfp_flags);
758
759                 if (!pd->port_rcvegrbuf[e]) {
760                         ret = -ENOMEM;
761                         goto bail_rcvegrbuf_phys;
762                 }
763         }
764
765         pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
766
767         for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
768                 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
769                 unsigned i;
770
771                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
772                         dd->ipath_f_put_tid(dd, e + egroff +
773                                             (u64 __iomem *)
774                                             ((char __iomem *)
775                                              dd->ipath_kregbase +
776                                              dd->ipath_rcvegrbase), 0, pa);
777                         pa += egrsize;
778                 }
779                 cond_resched(); /* don't hog the cpu */
780         }
781
782         ret = 0;
783         goto bail;
784
785 bail_rcvegrbuf_phys:
786         for (e = 0; e < pd->port_rcvegrbuf_chunks &&
787                      pd->port_rcvegrbuf[e]; e++)
788                 dma_free_coherent(&dd->pcidev->dev, size,
789                                   pd->port_rcvegrbuf[e],
790                                   pd->port_rcvegrbuf_phys[e]);
791
792         vfree(pd->port_rcvegrbuf_phys);
793         pd->port_rcvegrbuf_phys = NULL;
794 bail_rcvegrbuf:
795         vfree(pd->port_rcvegrbuf);
796         pd->port_rcvegrbuf = NULL;
797 bail:
798         return ret;
799 }
800
801 static int ipath_do_user_init(struct ipath_portdata *pd,
802                               const struct ipath_user_info *uinfo)
803 {
804         int ret = 0;
805         struct ipath_devdata *dd = pd->port_dd;
806         u64 physaddr, uaddr, off, atmp;
807         struct page *pagep;
808         u32 head32;
809         u64 head;
810
811         /* for now, if major version is different, bail */
812         if ((uinfo->spu_userversion >> 16) != IPATH_USER_SWMAJOR) {
813                 dev_info(&dd->pcidev->dev,
814                          "User major version %d not same as driver "
815                          "major %d\n", uinfo->spu_userversion >> 16,
816                          IPATH_USER_SWMAJOR);
817                 ret = -ENODEV;
818                 goto done;
819         }
820
821         if ((uinfo->spu_userversion & 0xffff) != IPATH_USER_SWMINOR)
822                 ipath_dbg("User minor version %d not same as driver "
823                           "minor %d\n", uinfo->spu_userversion & 0xffff,
824                           IPATH_USER_SWMINOR);
825
826         if (uinfo->spu_rcvhdrsize) {
827                 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
828                 if (ret)
829                         goto done;
830         }
831
832         /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
833
834         /* set up for the rcvhdr Q tail register writeback to user memory */
835         if (!uinfo->spu_rcvhdraddr ||
836             !access_ok(VERIFY_WRITE, (u64 __user *) (unsigned long)
837                        uinfo->spu_rcvhdraddr, sizeof(u64))) {
838                 ipath_dbg("Port %d rcvhdrtail addr %llx not valid\n",
839                           pd->port_port,
840                           (unsigned long long) uinfo->spu_rcvhdraddr);
841                 ret = -EINVAL;
842                 goto done;
843         }
844
845         off = offset_in_page(uinfo->spu_rcvhdraddr);
846         uaddr = PAGE_MASK & (unsigned long) uinfo->spu_rcvhdraddr;
847         ret = ipath_get_user_pages_nocopy(uaddr, &pagep);
848         if (ret) {
849                 dev_info(&dd->pcidev->dev, "Failed to lookup and lock "
850                          "address %llx for rcvhdrtail: errno %d\n",
851                          (unsigned long long) uinfo->spu_rcvhdraddr, -ret);
852                 goto done;
853         }
854         ipath_stats.sps_pagelocks++;
855         pd->port_rcvhdrtail_uaddr = uaddr;
856         pd->port_rcvhdrtail_pagep = pagep;
857         pd->port_rcvhdrtail_kvaddr =
858                 page_address(pagep);
859         pd->port_rcvhdrtail_kvaddr += off;
860         physaddr = page_to_phys(pagep) + off;
861         ipath_cdbg(VERBOSE, "port %d user addr %llx hdrtailaddr, %llx "
862                    "physical (off=%llx)\n",
863                    pd->port_port,
864                    (unsigned long long) uinfo->spu_rcvhdraddr,
865                    (unsigned long long) physaddr, (unsigned long long) off);
866         ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
867                               pd->port_port, physaddr);
868         atmp = ipath_read_kreg64_port(dd,
869                                       dd->ipath_kregs->kr_rcvhdrtailaddr,
870                                       pd->port_port);
871         if (physaddr != atmp) {
872                 ipath_dev_err(dd,
873                               "Catastrophic software error, "
874                               "RcvHdrTailAddr%u written as %llx, "
875                               "read back as %llx\n", pd->port_port,
876                               (unsigned long long) physaddr,
877                               (unsigned long long) atmp);
878                 ret = -EINVAL;
879                 goto done;
880         }
881
882         /* for right now, kernel piobufs are at end, so port 1 is at 0 */
883         pd->port_piobufs = dd->ipath_piobufbase +
884                 dd->ipath_pbufsport * (pd->port_port -
885                                        1) * dd->ipath_palign;
886         ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n",
887                    pd->port_port, pd->port_piobufs);
888
889         /*
890          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
891          * array for time being.  If pd->port_port > chip-supported,
892          * we need to do extra stuff here to handle by handling overflow
893          * through port 0, someday
894          */
895         ret = ipath_create_rcvhdrq(dd, pd);
896         if (!ret)
897                 ret = ipath_create_user_egr(pd);
898         if (ret)
899                 goto done;
900         /* enable receives now */
901         /* atomically set enable bit for this port */
902         set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
903                 &dd->ipath_rcvctrl);
904
905         /*
906          * set the head registers for this port to the current values
907          * of the tail pointers, since we don't know if they were
908          * updated on last use of the port.
909          */
910         head32 = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
911         head = (u64) head32;
912         ipath_write_ureg(dd, ur_rcvhdrhead, head, pd->port_port);
913         head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
914         ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
915         dd->ipath_lastegrheads[pd->port_port] = -1;
916         dd->ipath_lastrcvhdrqtails[pd->port_port] = -1;
917         ipath_cdbg(VERBOSE, "Wrote port%d head %llx, egrhead %x from "
918                    "tail regs\n", pd->port_port,
919                    (unsigned long long) head, head32);
920         pd->port_tidcursor = 0; /* start at beginning after open */
921         /*
922          * now enable the port; the tail registers will be written to memory
923          * by the chip as soon as it sees the write to
924          * dd->ipath_kregs->kr_rcvctrl.  The update only happens on
925          * transition from 0 to 1, so clear it first, then set it as part of
926          * enabling the port.  This will (very briefly) affect any other
927          * open ports, but it shouldn't be long enough to be an issue.
928          */
929         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
930                          dd->ipath_rcvctrl & ~INFINIPATH_R_TAILUPD);
931         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
932                          dd->ipath_rcvctrl);
933
934 done:
935         return ret;
936 }
937
938 static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
939                      u64 ureg)
940 {
941         unsigned long phys;
942         int ret;
943
944         /* it's the real hardware, so io_remap works */
945
946         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
947                 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
948                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
949                 ret = -EFAULT;
950         } else {
951                 phys = dd->ipath_physaddr + ureg;
952                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
953
954                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
955                 ret = io_remap_pfn_range(vma, vma->vm_start,
956                                          phys >> PAGE_SHIFT,
957                                          vma->vm_end - vma->vm_start,
958                                          vma->vm_page_prot);
959         }
960         return ret;
961 }
962
963 static int mmap_piobufs(struct vm_area_struct *vma,
964                         struct ipath_devdata *dd,
965                         struct ipath_portdata *pd)
966 {
967         unsigned long phys;
968         int ret;
969
970         /*
971          * When we map the PIO buffers, we want to map them as writeonly, no
972          * read possible.
973          */
974
975         if ((vma->vm_end - vma->vm_start) >
976             (dd->ipath_pbufsport * dd->ipath_palign)) {
977                 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
978                          "reqlen %lx > PAGE\n",
979                          vma->vm_end - vma->vm_start);
980                 ret = -EFAULT;
981                 goto bail;
982         }
983
984         phys = dd->ipath_physaddr + pd->port_piobufs;
985         /*
986          * Do *NOT* mark this as non-cached (PWT bit), or we don't get the
987          * write combining behavior we want on the PIO buffers!
988          * vma->vm_page_prot =
989          *        pgprot_noncached(vma->vm_page_prot);
990          */
991
992         if (vma->vm_flags & VM_READ) {
993                 dev_info(&dd->pcidev->dev,
994                          "Can't map piobufs as readable (flags=%lx)\n",
995                          vma->vm_flags);
996                 ret = -EPERM;
997                 goto bail;
998         }
999
1000         /* don't allow them to later change to readable with mprotect */
1001
1002         vma->vm_flags &= ~VM_MAYWRITE;
1003         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1004
1005         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1006                                  vma->vm_end - vma->vm_start,
1007                                  vma->vm_page_prot);
1008 bail:
1009         return ret;
1010 }
1011
1012 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1013                            struct ipath_portdata *pd)
1014 {
1015         struct ipath_devdata *dd = pd->port_dd;
1016         unsigned long start, size;
1017         size_t total_size, i;
1018         dma_addr_t *phys;
1019         int ret;
1020
1021         if (!pd->port_rcvegrbuf) {
1022                 ret = -EFAULT;
1023                 goto bail;
1024         }
1025
1026         size = pd->port_rcvegrbuf_size;
1027         total_size = pd->port_rcvegrbuf_chunks * size;
1028         if ((vma->vm_end - vma->vm_start) > total_size) {
1029                 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1030                          "reqlen %lx > actual %lx\n",
1031                          vma->vm_end - vma->vm_start,
1032                          (unsigned long) total_size);
1033                 ret = -EFAULT;
1034                 goto bail;
1035         }
1036
1037         if (vma->vm_flags & VM_WRITE) {
1038                 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1039                          "writable (flags=%lx)\n", vma->vm_flags);
1040                 ret = -EPERM;
1041                 goto bail;
1042         }
1043
1044         start = vma->vm_start;
1045         phys = pd->port_rcvegrbuf_phys;
1046
1047         /* don't allow them to later change to writeable with mprotect */
1048         vma->vm_flags &= ~VM_MAYWRITE;
1049
1050         for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1051                 ret = remap_pfn_range(vma, start, phys[i] >> PAGE_SHIFT,
1052                                       size, vma->vm_page_prot);
1053                 if (ret < 0)
1054                         goto bail;
1055         }
1056         ret = 0;
1057
1058 bail:
1059         return ret;
1060 }
1061
1062 static int mmap_rcvhdrq(struct vm_area_struct *vma,
1063                         struct ipath_portdata *pd)
1064 {
1065         struct ipath_devdata *dd = pd->port_dd;
1066         size_t total_size;
1067         int ret;
1068
1069         /*
1070          * kmalloc'ed memory, physically contiguous; this is from
1071          * spi_rcvhdr_base; we allow user to map read-write so they can
1072          * write hdrq entries to allow protocol code to directly poll
1073          * whether a hdrq entry has been written.
1074          */
1075         total_size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1076                            sizeof(u32), PAGE_SIZE);
1077         if ((vma->vm_end - vma->vm_start) > total_size) {
1078                 dev_info(&dd->pcidev->dev,
1079                          "FAIL on rcvhdrq: reqlen %lx > actual %lx\n",
1080                          vma->vm_end - vma->vm_start,
1081                          (unsigned long) total_size);
1082                 ret = -EFAULT;
1083                 goto bail;
1084         }
1085
1086         ret = remap_pfn_range(vma, vma->vm_start,
1087                               pd->port_rcvhdrq_phys >> PAGE_SHIFT,
1088                               vma->vm_end - vma->vm_start,
1089                               vma->vm_page_prot);
1090 bail:
1091         return ret;
1092 }
1093
1094 static int mmap_pioavailregs(struct vm_area_struct *vma,
1095                              struct ipath_portdata *pd)
1096 {
1097         struct ipath_devdata *dd = pd->port_dd;
1098         int ret;
1099
1100         /*
1101          * when we map the PIO bufferavail registers, we want to map them as
1102          * readonly, no write possible.
1103          *
1104          * kmalloc'ed memory, physically contiguous, one page only, readonly
1105          */
1106
1107         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1108                 dev_info(&dd->pcidev->dev, "FAIL on pioavailregs_dma: "
1109                          "reqlen %lx > actual %lx\n",
1110                          vma->vm_end - vma->vm_start,
1111                          (unsigned long) PAGE_SIZE);
1112                 ret = -EFAULT;
1113                 goto bail;
1114         }
1115
1116         if (vma->vm_flags & VM_WRITE) {
1117                 dev_info(&dd->pcidev->dev,
1118                          "Can't map pioavailregs as writable (flags=%lx)\n",
1119                          vma->vm_flags);
1120                 ret = -EPERM;
1121                 goto bail;
1122         }
1123
1124         /* don't allow them to later change with mprotect */
1125         vma->vm_flags &= ~VM_MAYWRITE;
1126
1127         ret = remap_pfn_range(vma, vma->vm_start,
1128                               dd->ipath_pioavailregs_phys >> PAGE_SHIFT,
1129                               PAGE_SIZE, vma->vm_page_prot);
1130 bail:
1131         return ret;
1132 }
1133
1134 /**
1135  * ipath_mmap - mmap various structures into user space
1136  * @fp: the file pointer
1137  * @vma: the VM area
1138  *
1139  * We use this to have a shared buffer between the kernel and the user code
1140  * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1141  * buffers in the chip.  We have the open and close entries so we can bump
1142  * the ref count and keep the driver from being unloaded while still mapped.
1143  */
1144 static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1145 {
1146         struct ipath_portdata *pd;
1147         struct ipath_devdata *dd;
1148         u64 pgaddr, ureg;
1149         int ret;
1150
1151         pd = port_fp(fp);
1152         dd = pd->port_dd;
1153         /*
1154          * This is the ipath_do_user_init() code, mapping the shared buffers
1155          * into the user process. The address referred to by vm_pgoff is the
1156          * virtual, not physical, address; we only do one mmap for each
1157          * space mapped.
1158          */
1159         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1160
1161         /*
1162          * note that ureg does *NOT* have the kregvirt as part of it, to be
1163          * sure that for 32 bit programs, we don't end up trying to map a >
1164          * 44 address.  Has to match ipath_get_base_info() code that sets
1165          * __spi_uregbase
1166          */
1167
1168         ureg = dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
1169
1170         ipath_cdbg(MM, "ushare: pgaddr %llx vm_start=%lx, vmlen %lx\n",
1171                    (unsigned long long) pgaddr, vma->vm_start,
1172                    vma->vm_end - vma->vm_start);
1173
1174         if (pgaddr == ureg)
1175                 ret = mmap_ureg(vma, dd, ureg);
1176         else if (pgaddr == pd->port_piobufs)
1177                 ret = mmap_piobufs(vma, dd, pd);
1178         else if (pgaddr == (u64) pd->port_rcvegr_phys)
1179                 ret = mmap_rcvegrbufs(vma, pd);
1180         else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1181                 ret = mmap_rcvhdrq(vma, pd);
1182         else if (pgaddr == dd->ipath_pioavailregs_phys)
1183                 ret = mmap_pioavailregs(vma, pd);
1184         else
1185                 ret = -EINVAL;
1186
1187         vma->vm_private_data = NULL;
1188
1189         if (ret < 0)
1190                 dev_info(&dd->pcidev->dev,
1191                          "Failure %d on addr %lx, off %lx\n",
1192                          -ret, vma->vm_start, vma->vm_pgoff);
1193
1194         return ret;
1195 }
1196
1197 static unsigned int ipath_poll(struct file *fp,
1198                                struct poll_table_struct *pt)
1199 {
1200         struct ipath_portdata *pd;
1201         u32 head, tail;
1202         int bit;
1203         struct ipath_devdata *dd;
1204
1205         pd = port_fp(fp);
1206         dd = pd->port_dd;
1207
1208         bit = pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT;
1209         set_bit(bit, &dd->ipath_rcvctrl);
1210
1211         /*
1212          * Before blocking, make sure that head is still == tail,
1213          * reading from the chip, so we can be sure the interrupt
1214          * enable has made it to the chip.  If not equal, disable
1215          * interrupt again and return immediately.  This avoids races,
1216          * and the overhead of the chip read doesn't matter much at
1217          * this point, since we are waiting for something anyway.
1218          */
1219
1220         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1221                          dd->ipath_rcvctrl);
1222
1223         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1224         tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1225
1226         if (tail == head) {
1227                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1228                 if(dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1229                         (void)ipath_write_ureg(dd, ur_rcvhdrhead,
1230                                                dd->ipath_rhdrhead_intr_off
1231                                                | head, pd->port_port);
1232                 poll_wait(fp, &pd->port_wait, pt);
1233
1234                 if (test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) {
1235                         /* timed out, no packets received */
1236                         clear_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1237                         pd->port_rcvwait_to++;
1238                 }
1239         }
1240         else {
1241                 /* it's already happened; don't do wait_event overhead */
1242                 pd->port_rcvnowait++;
1243         }
1244
1245         clear_bit(bit, &dd->ipath_rcvctrl);
1246         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1247                          dd->ipath_rcvctrl);
1248
1249         return 0;
1250 }
1251
1252 static int try_alloc_port(struct ipath_devdata *dd, int port,
1253                           struct file *fp)
1254 {
1255         int ret;
1256
1257         if (!dd->ipath_pd[port]) {
1258                 void *p, *ptmp;
1259
1260                 p = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1261
1262                 /*
1263                  * Allocate memory for use in ipath_tid_update() just once
1264                  * at open, not per call.  Reduces cost of expected send
1265                  * setup.
1266                  */
1267                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1268                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1269                                GFP_KERNEL);
1270                 if (!p || !ptmp) {
1271                         ipath_dev_err(dd, "Unable to allocate portdata "
1272                                       "memory, failing open\n");
1273                         ret = -ENOMEM;
1274                         kfree(p);
1275                         kfree(ptmp);
1276                         goto bail;
1277                 }
1278                 dd->ipath_pd[port] = p;
1279                 dd->ipath_pd[port]->port_port = port;
1280                 dd->ipath_pd[port]->port_dd = dd;
1281                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1282                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1283         }
1284         if (!dd->ipath_pd[port]->port_cnt) {
1285                 dd->ipath_pd[port]->port_cnt = 1;
1286                 fp->private_data = (void *) dd->ipath_pd[port];
1287                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1288                            current->comm, current->pid, dd->ipath_unit,
1289                            port);
1290                 dd->ipath_pd[port]->port_pid = current->pid;
1291                 strncpy(dd->ipath_pd[port]->port_comm, current->comm,
1292                         sizeof(dd->ipath_pd[port]->port_comm));
1293                 ipath_stats.sps_ports++;
1294                 ret = 0;
1295                 goto bail;
1296         }
1297         ret = -EBUSY;
1298
1299 bail:
1300         return ret;
1301 }
1302
1303 static inline int usable(struct ipath_devdata *dd)
1304 {
1305         return dd &&
1306                 (dd->ipath_flags & IPATH_PRESENT) &&
1307                 dd->ipath_kregbase &&
1308                 dd->ipath_lid &&
1309                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1310                                      | IPATH_LINKUNK));
1311 }
1312
1313 static int find_free_port(int unit, struct file *fp)
1314 {
1315         struct ipath_devdata *dd = ipath_lookup(unit);
1316         int ret, i;
1317
1318         if (!dd) {
1319                 ret = -ENODEV;
1320                 goto bail;
1321         }
1322
1323         if (!usable(dd)) {
1324                 ret = -ENETDOWN;
1325                 goto bail;
1326         }
1327
1328         for (i = 0; i < dd->ipath_cfgports; i++) {
1329                 ret = try_alloc_port(dd, i, fp);
1330                 if (ret != -EBUSY)
1331                         goto bail;
1332         }
1333         ret = -EBUSY;
1334
1335 bail:
1336         return ret;
1337 }
1338
1339 static int find_best_unit(struct file *fp)
1340 {
1341         int ret = 0, i, prefunit = -1, devmax;
1342         int maxofallports, npresent, nup;
1343         int ndev;
1344
1345         (void) ipath_count_units(&npresent, &nup, &maxofallports);
1346
1347         /*
1348          * This code is present to allow a knowledgeable person to
1349          * specify the layout of processes to processors before opening
1350          * this driver, and then we'll assign the process to the "closest"
1351          * HT-400 to that processor (we assume reasonable connectivity,
1352          * for now).  This code assumes that if affinity has been set
1353          * before this point, that at most one cpu is set; for now this
1354          * is reasonable.  I check for both cpus_empty() and cpus_full(),
1355          * in case some kernel variant sets none of the bits when no
1356          * affinity is set.  2.6.11 and 12 kernels have all present
1357          * cpus set.  Some day we'll have to fix it up further to handle
1358          * a cpu subset.  This algorithm fails for two HT-400's connected
1359          * in tunnel fashion.  Eventually this needs real topology
1360          * information.  There may be some issues with dual core numbering
1361          * as well.  This needs more work prior to release.
1362          */
1363         if (!cpus_empty(current->cpus_allowed) &&
1364             !cpus_full(current->cpus_allowed)) {
1365                 int ncpus = num_online_cpus(), curcpu = -1;
1366                 for (i = 0; i < ncpus; i++)
1367                         if (cpu_isset(i, current->cpus_allowed)) {
1368                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1369                                            "cpu %d\n", current->comm,
1370                                            current->pid, i);
1371                                 curcpu = i;
1372                         }
1373                 if (curcpu != -1) {
1374                         if (npresent) {
1375                                 prefunit = curcpu / (ncpus / npresent);
1376                                 ipath_dbg("%s[%u] %d chips, %d cpus, "
1377                                           "%d cpus/chip, select unit %d\n",
1378                                           current->comm, current->pid,
1379                                           npresent, ncpus, ncpus / npresent,
1380                                           prefunit);
1381                         }
1382                 }
1383         }
1384
1385         /*
1386          * user ports start at 1, kernel port is 0
1387          * For now, we do round-robin access across all chips
1388          */
1389
1390         if (prefunit != -1)
1391                 devmax = prefunit + 1;
1392         else
1393                 devmax = ipath_count_units(NULL, NULL, NULL);
1394 recheck:
1395         for (i = 1; i < maxofallports; i++) {
1396                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1397                      ndev++) {
1398                         struct ipath_devdata *dd = ipath_lookup(ndev);
1399
1400                         if (!usable(dd))
1401                                 continue; /* can't use this unit */
1402                         if (i >= dd->ipath_cfgports)
1403                                 /*
1404                                  * Maxed out on users of this unit. Try
1405                                  * next.
1406                                  */
1407                                 continue;
1408                         ret = try_alloc_port(dd, i, fp);
1409                         if (!ret)
1410                                 goto done;
1411                 }
1412         }
1413
1414         if (npresent) {
1415                 if (nup == 0) {
1416                         ret = -ENETDOWN;
1417                         ipath_dbg("No ports available (none initialized "
1418                                   "and ready)\n");
1419                 } else {
1420                         if (prefunit > 0) {
1421                                 /* if started above 0, retry from 0 */
1422                                 ipath_cdbg(PROC,
1423                                            "%s[%u] no ports on prefunit "
1424                                            "%d, clear and re-check\n",
1425                                            current->comm, current->pid,
1426                                            prefunit);
1427                                 devmax = ipath_count_units(NULL, NULL,
1428                                                            NULL);
1429                                 prefunit = -1;
1430                                 goto recheck;
1431                         }
1432                         ret = -EBUSY;
1433                         ipath_dbg("No ports available\n");
1434                 }
1435         } else {
1436                 ret = -ENXIO;
1437                 ipath_dbg("No boards found\n");
1438         }
1439
1440 done:
1441         return ret;
1442 }
1443
1444 static int ipath_open(struct inode *in, struct file *fp)
1445 {
1446         int ret, minor;
1447
1448         mutex_lock(&ipath_mutex);
1449
1450         minor = iminor(in);
1451         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1452                    (long)in->i_rdev, minor);
1453
1454         if (minor)
1455                 ret = find_free_port(minor - 1, fp);
1456         else
1457                 ret = find_best_unit(fp);
1458
1459         mutex_unlock(&ipath_mutex);
1460         return ret;
1461 }
1462
1463 /**
1464  * unlock_exptid - unlock any expected TID entries port still had in use
1465  * @pd: port
1466  *
1467  * We don't actually update the chip here, because we do a bulk update
1468  * below, using ipath_f_clear_tids.
1469  */
1470 static void unlock_expected_tids(struct ipath_portdata *pd)
1471 {
1472         struct ipath_devdata *dd = pd->port_dd;
1473         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
1474         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
1475
1476         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
1477                    pd->port_port);
1478         for (i = port_tidbase; i < maxtid; i++) {
1479                 if (!dd->ipath_pageshadow[i])
1480                         continue;
1481
1482                 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i],
1483                                                   1);
1484                 dd->ipath_pageshadow[i] = NULL;
1485                 cnt++;
1486                 ipath_stats.sps_pageunlocks++;
1487         }
1488         if (cnt)
1489                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
1490                            pd->port_port, cnt);
1491
1492         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
1493                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
1494                            (unsigned long long) ipath_stats.sps_pagelocks,
1495                            (unsigned long long)
1496                            ipath_stats.sps_pageunlocks);
1497 }
1498
1499 static int ipath_close(struct inode *in, struct file *fp)
1500 {
1501         int ret = 0;
1502         struct ipath_portdata *pd;
1503         struct ipath_devdata *dd;
1504         unsigned port;
1505
1506         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
1507                    (long)in->i_rdev, fp->private_data);
1508
1509         mutex_lock(&ipath_mutex);
1510
1511         pd = port_fp(fp);
1512         port = pd->port_port;
1513         fp->private_data = NULL;
1514         dd = pd->port_dd;
1515
1516         if (pd->port_hdrqfull) {
1517                 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
1518                            "during run\n", pd->port_comm, pd->port_pid,
1519                            pd->port_hdrqfull);
1520                 pd->port_hdrqfull = 0;
1521         }
1522
1523         if (pd->port_rcvwait_to || pd->port_piowait_to
1524             || pd->port_rcvnowait || pd->port_pionowait) {
1525                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
1526                            "%u rcv %u, pio already\n",
1527                            pd->port_port, pd->port_rcvwait_to,
1528                            pd->port_piowait_to, pd->port_rcvnowait,
1529                            pd->port_pionowait);
1530                 pd->port_rcvwait_to = pd->port_piowait_to =
1531                         pd->port_rcvnowait = pd->port_pionowait = 0;
1532         }
1533         if (pd->port_flag) {
1534                 ipath_dbg("port %u port_flag still set to 0x%lx\n",
1535                           pd->port_port, pd->port_flag);
1536                 pd->port_flag = 0;
1537         }
1538
1539         if (dd->ipath_kregbase) {
1540                 if (pd->port_rcvhdrtail_uaddr) {
1541                         pd->port_rcvhdrtail_uaddr = 0;
1542                         pd->port_rcvhdrtail_kvaddr = NULL;
1543                         ipath_release_user_pages_on_close(
1544                                 &pd->port_rcvhdrtail_pagep, 1);
1545                         pd->port_rcvhdrtail_pagep = NULL;
1546                         ipath_stats.sps_pageunlocks++;
1547                 }
1548                 ipath_write_kreg_port(
1549                         dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
1550                         port, 0ULL);
1551                 ipath_write_kreg_port(
1552                         dd, dd->ipath_kregs->kr_rcvhdraddr,
1553                         pd->port_port, 0);
1554
1555                 /* clean up the pkeys for this port user */
1556                 ipath_clean_part_key(pd, dd);
1557
1558                 if (port < dd->ipath_cfgports) {
1559                         int i = dd->ipath_pbufsport * (port - 1);
1560                         ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
1561
1562                         /* atomically clear receive enable port. */
1563                         clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
1564                                   &dd->ipath_rcvctrl);
1565                         ipath_write_kreg(
1566                                 dd,
1567                                 dd->ipath_kregs->kr_rcvctrl,
1568                                 dd->ipath_rcvctrl);
1569
1570                         if (dd->ipath_pageshadow)
1571                                 unlock_expected_tids(pd);
1572                         ipath_stats.sps_ports--;
1573                         ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
1574                                    pd->port_comm, pd->port_pid,
1575                                    dd->ipath_unit, port);
1576                 }
1577         }
1578
1579         pd->port_cnt = 0;
1580         pd->port_pid = 0;
1581
1582         dd->ipath_f_clear_tids(dd, pd->port_port);
1583
1584         ipath_free_pddata(dd, pd->port_port, 0);
1585
1586         mutex_unlock(&ipath_mutex);
1587
1588         return ret;
1589 }
1590
1591 static int ipath_port_info(struct ipath_portdata *pd,
1592                            struct ipath_port_info __user *uinfo)
1593 {
1594         struct ipath_port_info info;
1595         int nup;
1596         int ret;
1597
1598         (void) ipath_count_units(NULL, &nup, NULL);
1599         info.num_active = nup;
1600         info.unit = pd->port_dd->ipath_unit;
1601         info.port = pd->port_port;
1602
1603         if (copy_to_user(uinfo, &info, sizeof(info))) {
1604                 ret = -EFAULT;
1605                 goto bail;
1606         }
1607         ret = 0;
1608
1609 bail:
1610         return ret;
1611 }
1612
1613 static ssize_t ipath_write(struct file *fp, const char __user *data,
1614                            size_t count, loff_t *off)
1615 {
1616         const struct ipath_cmd __user *ucmd;
1617         struct ipath_portdata *pd;
1618         const void __user *src;
1619         size_t consumed, copy;
1620         struct ipath_cmd cmd;
1621         ssize_t ret = 0;
1622         void *dest;
1623
1624         if (count < sizeof(cmd.type)) {
1625                 ret = -EINVAL;
1626                 goto bail;
1627         }
1628
1629         ucmd = (const struct ipath_cmd __user *) data;
1630
1631         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1632                 ret = -EFAULT;
1633                 goto bail;
1634         }
1635
1636         consumed = sizeof(cmd.type);
1637
1638         switch (cmd.type) {
1639         case IPATH_CMD_USER_INIT:
1640                 copy = sizeof(cmd.cmd.user_info);
1641                 dest = &cmd.cmd.user_info;
1642                 src = &ucmd->cmd.user_info;
1643                 break;
1644         case IPATH_CMD_RECV_CTRL:
1645                 copy = sizeof(cmd.cmd.recv_ctrl);
1646                 dest = &cmd.cmd.recv_ctrl;
1647                 src = &ucmd->cmd.recv_ctrl;
1648                 break;
1649         case IPATH_CMD_PORT_INFO:
1650                 copy = sizeof(cmd.cmd.port_info);
1651                 dest = &cmd.cmd.port_info;
1652                 src = &ucmd->cmd.port_info;
1653                 break;
1654         case IPATH_CMD_TID_UPDATE:
1655         case IPATH_CMD_TID_FREE:
1656                 copy = sizeof(cmd.cmd.tid_info);
1657                 dest = &cmd.cmd.tid_info;
1658                 src = &ucmd->cmd.tid_info;
1659                 break;
1660         case IPATH_CMD_SET_PART_KEY:
1661                 copy = sizeof(cmd.cmd.part_key);
1662                 dest = &cmd.cmd.part_key;
1663                 src = &ucmd->cmd.part_key;
1664                 break;
1665         default:
1666                 ret = -EINVAL;
1667                 goto bail;
1668         }
1669
1670         if ((count - consumed) < copy) {
1671                 ret = -EINVAL;
1672                 goto bail;
1673         }
1674
1675         if (copy_from_user(dest, src, copy)) {
1676                 ret = -EFAULT;
1677                 goto bail;
1678         }
1679
1680         consumed += copy;
1681         pd = port_fp(fp);
1682
1683         switch (cmd.type) {
1684         case IPATH_CMD_USER_INIT:
1685                 ret = ipath_do_user_init(pd, &cmd.cmd.user_info);
1686                 if (ret < 0)
1687                         goto bail;
1688                 ret = ipath_get_base_info(
1689                         pd, (void __user *) (unsigned long)
1690                         cmd.cmd.user_info.spu_base_info,
1691                         cmd.cmd.user_info.spu_base_info_size);
1692                 break;
1693         case IPATH_CMD_RECV_CTRL:
1694                 ret = ipath_manage_rcvq(pd, cmd.cmd.recv_ctrl);
1695                 break;
1696         case IPATH_CMD_PORT_INFO:
1697                 ret = ipath_port_info(pd,
1698                                       (struct ipath_port_info __user *)
1699                                       (unsigned long) cmd.cmd.port_info);
1700                 break;
1701         case IPATH_CMD_TID_UPDATE:
1702                 ret = ipath_tid_update(pd, &cmd.cmd.tid_info);
1703                 break;
1704         case IPATH_CMD_TID_FREE:
1705                 ret = ipath_tid_free(pd, &cmd.cmd.tid_info);
1706                 break;
1707         case IPATH_CMD_SET_PART_KEY:
1708                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
1709                 break;
1710         }
1711
1712         if (ret >= 0)
1713                 ret = consumed;
1714
1715 bail:
1716         return ret;
1717 }
1718
1719 static struct class *ipath_class;
1720
1721 static int init_cdev(int minor, char *name, struct file_operations *fops,
1722                      struct cdev **cdevp, struct class_device **class_devp)
1723 {
1724         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
1725         struct cdev *cdev = NULL;
1726         struct class_device *class_dev = NULL;
1727         int ret;
1728
1729         cdev = cdev_alloc();
1730         if (!cdev) {
1731                 printk(KERN_ERR IPATH_DRV_NAME
1732                        ": Could not allocate cdev for minor %d, %s\n",
1733                        minor, name);
1734                 ret = -ENOMEM;
1735                 goto done;
1736         }
1737
1738         cdev->owner = THIS_MODULE;
1739         cdev->ops = fops;
1740         kobject_set_name(&cdev->kobj, name);
1741
1742         ret = cdev_add(cdev, dev, 1);
1743         if (ret < 0) {
1744                 printk(KERN_ERR IPATH_DRV_NAME
1745                        ": Could not add cdev for minor %d, %s (err %d)\n",
1746                        minor, name, -ret);
1747                 goto err_cdev;
1748         }
1749
1750         class_dev = class_device_create(ipath_class, NULL, dev, NULL, name);
1751
1752         if (IS_ERR(class_dev)) {
1753                 ret = PTR_ERR(class_dev);
1754                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1755                        "class_dev for minor %d, %s (err %d)\n",
1756                        minor, name, -ret);
1757                 goto err_cdev;
1758         }
1759
1760         goto done;
1761
1762 err_cdev:
1763         cdev_del(cdev);
1764         cdev = NULL;
1765
1766 done:
1767         if (ret >= 0) {
1768                 *cdevp = cdev;
1769                 *class_devp = class_dev;
1770         } else {
1771                 *cdevp = NULL;
1772                 *class_devp = NULL;
1773         }
1774
1775         return ret;
1776 }
1777
1778 int ipath_cdev_init(int minor, char *name, struct file_operations *fops,
1779                     struct cdev **cdevp, struct class_device **class_devp)
1780 {
1781         return init_cdev(minor, name, fops, cdevp, class_devp);
1782 }
1783
1784 static void cleanup_cdev(struct cdev **cdevp,
1785                          struct class_device **class_devp)
1786 {
1787         struct class_device *class_dev = *class_devp;
1788
1789         if (class_dev) {
1790                 class_device_unregister(class_dev);
1791                 *class_devp = NULL;
1792         }
1793
1794         if (*cdevp) {
1795                 cdev_del(*cdevp);
1796                 *cdevp = NULL;
1797         }
1798 }
1799
1800 void ipath_cdev_cleanup(struct cdev **cdevp,
1801                         struct class_device **class_devp)
1802 {
1803         cleanup_cdev(cdevp, class_devp);
1804 }
1805
1806 static struct cdev *wildcard_cdev;
1807 static struct class_device *wildcard_class_dev;
1808
1809 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
1810
1811 static int user_init(void)
1812 {
1813         int ret;
1814
1815         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
1816         if (ret < 0) {
1817                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
1818                        "chrdev region (err %d)\n", -ret);
1819                 goto done;
1820         }
1821
1822         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
1823
1824         if (IS_ERR(ipath_class)) {
1825                 ret = PTR_ERR(ipath_class);
1826                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1827                        "device class (err %d)\n", -ret);
1828                 goto bail;
1829         }
1830
1831         goto done;
1832 bail:
1833         unregister_chrdev_region(dev, IPATH_NMINORS);
1834 done:
1835         return ret;
1836 }
1837
1838 static void user_cleanup(void)
1839 {
1840         if (ipath_class) {
1841                 class_destroy(ipath_class);
1842                 ipath_class = NULL;
1843         }
1844
1845         unregister_chrdev_region(dev, IPATH_NMINORS);
1846 }
1847
1848 static atomic_t user_count = ATOMIC_INIT(0);
1849 static atomic_t user_setup = ATOMIC_INIT(0);
1850
1851 int ipath_user_add(struct ipath_devdata *dd)
1852 {
1853         char name[10];
1854         int ret;
1855
1856         if (atomic_inc_return(&user_count) == 1) {
1857                 ret = user_init();
1858                 if (ret < 0) {
1859                         ipath_dev_err(dd, "Unable to set up user support: "
1860                                       "error %d\n", -ret);
1861                         goto bail;
1862                 }
1863                 ret = ipath_diag_init();
1864                 if (ret < 0) {
1865                         ipath_dev_err(dd, "Unable to set up diag support: "
1866                                       "error %d\n", -ret);
1867                         goto bail_sma;
1868                 }
1869
1870                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
1871                                 &wildcard_class_dev);
1872                 if (ret < 0) {
1873                         ipath_dev_err(dd, "Could not create wildcard "
1874                                       "minor: error %d\n", -ret);
1875                         goto bail_diag;
1876                 }
1877
1878                 atomic_set(&user_setup, 1);
1879         }
1880
1881         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
1882
1883         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
1884                         &dd->cdev, &dd->class_dev);
1885         if (ret < 0)
1886                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
1887                               dd->ipath_unit + 1, name);
1888
1889         goto bail;
1890
1891 bail_diag:
1892         ipath_diag_cleanup();
1893 bail_sma:
1894         user_cleanup();
1895 bail:
1896         return ret;
1897 }
1898
1899 void ipath_user_del(struct ipath_devdata *dd)
1900 {
1901         cleanup_cdev(&dd->cdev, &dd->class_dev);
1902
1903         if (atomic_dec_return(&user_count) == 0) {
1904                 if (atomic_read(&user_setup) == 0)
1905                         goto bail;
1906
1907                 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
1908                 ipath_diag_cleanup();
1909                 user_cleanup();
1910
1911                 atomic_set(&user_setup, 0);
1912         }
1913 bail:
1914         return;
1915 }