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 (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         unsigned pollflag = 0;
1154         struct ipath_devdata *dd;
1155
1156         pd = port_fp(fp);
1157         dd = pd->port_dd;
1158
1159         bit = pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT;
1160         set_bit(bit, &dd->ipath_rcvctrl);
1161
1162         /*
1163          * Before blocking, make sure that head is still == tail,
1164          * reading from the chip, so we can be sure the interrupt
1165          * enable has made it to the chip.  If not equal, disable
1166          * interrupt again and return immediately.  This avoids races,
1167          * and the overhead of the chip read doesn't matter much at
1168          * this point, since we are waiting for something anyway.
1169          */
1170
1171         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1172                          dd->ipath_rcvctrl);
1173
1174         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1175         tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1176
1177         if (tail == head) {
1178                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1179                 if(dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1180                         (void)ipath_write_ureg(dd, ur_rcvhdrhead,
1181                                                dd->ipath_rhdrhead_intr_off
1182                                                | head, pd->port_port);
1183                 poll_wait(fp, &pd->port_wait, pt);
1184
1185                 if (test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) {
1186                         /* timed out, no packets received */
1187                         clear_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1188                         pd->port_rcvwait_to++;
1189                 }
1190                 else
1191                         pollflag = POLLIN | POLLRDNORM;
1192         }
1193         else {
1194                 /* it's already happened; don't do wait_event overhead */
1195                 pollflag = POLLIN | POLLRDNORM;
1196                 pd->port_rcvnowait++;
1197         }
1198
1199         clear_bit(bit, &dd->ipath_rcvctrl);
1200         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1201                          dd->ipath_rcvctrl);
1202
1203         return pollflag;
1204 }
1205
1206 static int try_alloc_port(struct ipath_devdata *dd, int port,
1207                           struct file *fp)
1208 {
1209         int ret;
1210
1211         if (!dd->ipath_pd[port]) {
1212                 void *p, *ptmp;
1213
1214                 p = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1215
1216                 /*
1217                  * Allocate memory for use in ipath_tid_update() just once
1218                  * at open, not per call.  Reduces cost of expected send
1219                  * setup.
1220                  */
1221                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1222                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1223                                GFP_KERNEL);
1224                 if (!p || !ptmp) {
1225                         ipath_dev_err(dd, "Unable to allocate portdata "
1226                                       "memory, failing open\n");
1227                         ret = -ENOMEM;
1228                         kfree(p);
1229                         kfree(ptmp);
1230                         goto bail;
1231                 }
1232                 dd->ipath_pd[port] = p;
1233                 dd->ipath_pd[port]->port_port = port;
1234                 dd->ipath_pd[port]->port_dd = dd;
1235                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1236                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1237         }
1238         if (!dd->ipath_pd[port]->port_cnt) {
1239                 dd->ipath_pd[port]->port_cnt = 1;
1240                 fp->private_data = (void *) dd->ipath_pd[port];
1241                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1242                            current->comm, current->pid, dd->ipath_unit,
1243                            port);
1244                 dd->ipath_pd[port]->port_pid = current->pid;
1245                 strncpy(dd->ipath_pd[port]->port_comm, current->comm,
1246                         sizeof(dd->ipath_pd[port]->port_comm));
1247                 ipath_stats.sps_ports++;
1248                 ret = 0;
1249                 goto bail;
1250         }
1251         ret = -EBUSY;
1252
1253 bail:
1254         return ret;
1255 }
1256
1257 static inline int usable(struct ipath_devdata *dd)
1258 {
1259         return dd &&
1260                 (dd->ipath_flags & IPATH_PRESENT) &&
1261                 dd->ipath_kregbase &&
1262                 dd->ipath_lid &&
1263                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1264                                      | IPATH_LINKUNK));
1265 }
1266
1267 static int find_free_port(int unit, struct file *fp)
1268 {
1269         struct ipath_devdata *dd = ipath_lookup(unit);
1270         int ret, i;
1271
1272         if (!dd) {
1273                 ret = -ENODEV;
1274                 goto bail;
1275         }
1276
1277         if (!usable(dd)) {
1278                 ret = -ENETDOWN;
1279                 goto bail;
1280         }
1281
1282         for (i = 0; i < dd->ipath_cfgports; i++) {
1283                 ret = try_alloc_port(dd, i, fp);
1284                 if (ret != -EBUSY)
1285                         goto bail;
1286         }
1287         ret = -EBUSY;
1288
1289 bail:
1290         return ret;
1291 }
1292
1293 static int find_best_unit(struct file *fp)
1294 {
1295         int ret = 0, i, prefunit = -1, devmax;
1296         int maxofallports, npresent, nup;
1297         int ndev;
1298
1299         (void) ipath_count_units(&npresent, &nup, &maxofallports);
1300
1301         /*
1302          * This code is present to allow a knowledgeable person to
1303          * specify the layout of processes to processors before opening
1304          * this driver, and then we'll assign the process to the "closest"
1305          * InfiniPath chip to that processor (we assume reasonable connectivity,
1306          * for now).  This code assumes that if affinity has been set
1307          * before this point, that at most one cpu is set; for now this
1308          * is reasonable.  I check for both cpus_empty() and cpus_full(),
1309          * in case some kernel variant sets none of the bits when no
1310          * affinity is set.  2.6.11 and 12 kernels have all present
1311          * cpus set.  Some day we'll have to fix it up further to handle
1312          * a cpu subset.  This algorithm fails for two HT chips connected
1313          * in tunnel fashion.  Eventually this needs real topology
1314          * information.  There may be some issues with dual core numbering
1315          * as well.  This needs more work prior to release.
1316          */
1317         if (!cpus_empty(current->cpus_allowed) &&
1318             !cpus_full(current->cpus_allowed)) {
1319                 int ncpus = num_online_cpus(), curcpu = -1;
1320                 for (i = 0; i < ncpus; i++)
1321                         if (cpu_isset(i, current->cpus_allowed)) {
1322                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1323                                            "cpu %d\n", current->comm,
1324                                            current->pid, i);
1325                                 curcpu = i;
1326                         }
1327                 if (curcpu != -1) {
1328                         if (npresent) {
1329                                 prefunit = curcpu / (ncpus / npresent);
1330                                 ipath_dbg("%s[%u] %d chips, %d cpus, "
1331                                           "%d cpus/chip, select unit %d\n",
1332                                           current->comm, current->pid,
1333                                           npresent, ncpus, ncpus / npresent,
1334                                           prefunit);
1335                         }
1336                 }
1337         }
1338
1339         /*
1340          * user ports start at 1, kernel port is 0
1341          * For now, we do round-robin access across all chips
1342          */
1343
1344         if (prefunit != -1)
1345                 devmax = prefunit + 1;
1346         else
1347                 devmax = ipath_count_units(NULL, NULL, NULL);
1348 recheck:
1349         for (i = 1; i < maxofallports; i++) {
1350                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1351                      ndev++) {
1352                         struct ipath_devdata *dd = ipath_lookup(ndev);
1353
1354                         if (!usable(dd))
1355                                 continue; /* can't use this unit */
1356                         if (i >= dd->ipath_cfgports)
1357                                 /*
1358                                  * Maxed out on users of this unit. Try
1359                                  * next.
1360                                  */
1361                                 continue;
1362                         ret = try_alloc_port(dd, i, fp);
1363                         if (!ret)
1364                                 goto done;
1365                 }
1366         }
1367
1368         if (npresent) {
1369                 if (nup == 0) {
1370                         ret = -ENETDOWN;
1371                         ipath_dbg("No ports available (none initialized "
1372                                   "and ready)\n");
1373                 } else {
1374                         if (prefunit > 0) {
1375                                 /* if started above 0, retry from 0 */
1376                                 ipath_cdbg(PROC,
1377                                            "%s[%u] no ports on prefunit "
1378                                            "%d, clear and re-check\n",
1379                                            current->comm, current->pid,
1380                                            prefunit);
1381                                 devmax = ipath_count_units(NULL, NULL,
1382                                                            NULL);
1383                                 prefunit = -1;
1384                                 goto recheck;
1385                         }
1386                         ret = -EBUSY;
1387                         ipath_dbg("No ports available\n");
1388                 }
1389         } else {
1390                 ret = -ENXIO;
1391                 ipath_dbg("No boards found\n");
1392         }
1393
1394 done:
1395         return ret;
1396 }
1397
1398 static int ipath_open(struct inode *in, struct file *fp)
1399 {
1400         int ret, user_minor;
1401
1402         mutex_lock(&ipath_mutex);
1403
1404         user_minor = iminor(in) - IPATH_USER_MINOR_BASE;
1405         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1406                    (long)in->i_rdev, user_minor);
1407
1408         if (user_minor)
1409                 ret = find_free_port(user_minor - 1, fp);
1410         else
1411                 ret = find_best_unit(fp);
1412
1413         mutex_unlock(&ipath_mutex);
1414         return ret;
1415 }
1416
1417 /**
1418  * unlock_exptid - unlock any expected TID entries port still had in use
1419  * @pd: port
1420  *
1421  * We don't actually update the chip here, because we do a bulk update
1422  * below, using ipath_f_clear_tids.
1423  */
1424 static void unlock_expected_tids(struct ipath_portdata *pd)
1425 {
1426         struct ipath_devdata *dd = pd->port_dd;
1427         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
1428         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
1429
1430         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
1431                    pd->port_port);
1432         for (i = port_tidbase; i < maxtid; i++) {
1433                 if (!dd->ipath_pageshadow[i])
1434                         continue;
1435
1436                 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i],
1437                                                   1);
1438                 dd->ipath_pageshadow[i] = NULL;
1439                 cnt++;
1440                 ipath_stats.sps_pageunlocks++;
1441         }
1442         if (cnt)
1443                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
1444                            pd->port_port, cnt);
1445
1446         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
1447                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
1448                            (unsigned long long) ipath_stats.sps_pagelocks,
1449                            (unsigned long long)
1450                            ipath_stats.sps_pageunlocks);
1451 }
1452
1453 static int ipath_close(struct inode *in, struct file *fp)
1454 {
1455         int ret = 0;
1456         struct ipath_portdata *pd;
1457         struct ipath_devdata *dd;
1458         unsigned port;
1459
1460         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
1461                    (long)in->i_rdev, fp->private_data);
1462
1463         mutex_lock(&ipath_mutex);
1464
1465         pd = port_fp(fp);
1466         port = pd->port_port;
1467         fp->private_data = NULL;
1468         dd = pd->port_dd;
1469
1470         if (pd->port_hdrqfull) {
1471                 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
1472                            "during run\n", pd->port_comm, pd->port_pid,
1473                            pd->port_hdrqfull);
1474                 pd->port_hdrqfull = 0;
1475         }
1476
1477         if (pd->port_rcvwait_to || pd->port_piowait_to
1478             || pd->port_rcvnowait || pd->port_pionowait) {
1479                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
1480                            "%u rcv %u, pio already\n",
1481                            pd->port_port, pd->port_rcvwait_to,
1482                            pd->port_piowait_to, pd->port_rcvnowait,
1483                            pd->port_pionowait);
1484                 pd->port_rcvwait_to = pd->port_piowait_to =
1485                         pd->port_rcvnowait = pd->port_pionowait = 0;
1486         }
1487         if (pd->port_flag) {
1488                 ipath_dbg("port %u port_flag still set to 0x%lx\n",
1489                           pd->port_port, pd->port_flag);
1490                 pd->port_flag = 0;
1491         }
1492
1493         if (dd->ipath_kregbase) {
1494                 int i;
1495                 /* atomically clear receive enable port. */
1496                 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
1497                           &dd->ipath_rcvctrl);
1498                 ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
1499                         dd->ipath_rcvctrl);
1500                 /* and read back from chip to be sure that nothing
1501                  * else is in flight when we do the rest */
1502                 (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1503
1504                 /* clean up the pkeys for this port user */
1505                 ipath_clean_part_key(pd, dd);
1506
1507
1508                 /*
1509                  * be paranoid, and never write 0's to these, just use an
1510                  * unused part of the port 0 tail page.  Of course,
1511                  * rcvhdraddr points to a large chunk of memory, so this
1512                  * could still trash things, but at least it won't trash
1513                  * page 0, and by disabling the port, it should stop "soon",
1514                  * even if a packet or two is in already in flight after we
1515                  * disabled the port.
1516                  */
1517                 ipath_write_kreg_port(dd,
1518                         dd->ipath_kregs->kr_rcvhdrtailaddr, port,
1519                         dd->ipath_dummy_hdrq_phys);
1520                 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
1521                         pd->port_port, dd->ipath_dummy_hdrq_phys);
1522
1523                 i = dd->ipath_pbufsport * (port - 1);
1524                 ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
1525
1526                 if (dd->ipath_pageshadow)
1527                         unlock_expected_tids(pd);
1528                 ipath_stats.sps_ports--;
1529                 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
1530                            pd->port_comm, pd->port_pid,
1531                            dd->ipath_unit, port);
1532
1533                 dd->ipath_f_clear_tids(dd, pd->port_port);
1534         }
1535
1536         pd->port_cnt = 0;
1537         pd->port_pid = 0;
1538
1539         dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */
1540         mutex_unlock(&ipath_mutex);
1541         ipath_free_pddata(dd, pd); /* after releasing the mutex */
1542
1543         return ret;
1544 }
1545
1546 static int ipath_port_info(struct ipath_portdata *pd,
1547                            struct ipath_port_info __user *uinfo)
1548 {
1549         struct ipath_port_info info;
1550         int nup;
1551         int ret;
1552
1553         (void) ipath_count_units(NULL, &nup, NULL);
1554         info.num_active = nup;
1555         info.unit = pd->port_dd->ipath_unit;
1556         info.port = pd->port_port;
1557
1558         if (copy_to_user(uinfo, &info, sizeof(info))) {
1559                 ret = -EFAULT;
1560                 goto bail;
1561         }
1562         ret = 0;
1563
1564 bail:
1565         return ret;
1566 }
1567
1568 static ssize_t ipath_write(struct file *fp, const char __user *data,
1569                            size_t count, loff_t *off)
1570 {
1571         const struct ipath_cmd __user *ucmd;
1572         struct ipath_portdata *pd;
1573         const void __user *src;
1574         size_t consumed, copy;
1575         struct ipath_cmd cmd;
1576         ssize_t ret = 0;
1577         void *dest;
1578
1579         if (count < sizeof(cmd.type)) {
1580                 ret = -EINVAL;
1581                 goto bail;
1582         }
1583
1584         ucmd = (const struct ipath_cmd __user *) data;
1585
1586         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1587                 ret = -EFAULT;
1588                 goto bail;
1589         }
1590
1591         consumed = sizeof(cmd.type);
1592
1593         switch (cmd.type) {
1594         case IPATH_CMD_USER_INIT:
1595                 copy = sizeof(cmd.cmd.user_info);
1596                 dest = &cmd.cmd.user_info;
1597                 src = &ucmd->cmd.user_info;
1598                 break;
1599         case IPATH_CMD_RECV_CTRL:
1600                 copy = sizeof(cmd.cmd.recv_ctrl);
1601                 dest = &cmd.cmd.recv_ctrl;
1602                 src = &ucmd->cmd.recv_ctrl;
1603                 break;
1604         case IPATH_CMD_PORT_INFO:
1605                 copy = sizeof(cmd.cmd.port_info);
1606                 dest = &cmd.cmd.port_info;
1607                 src = &ucmd->cmd.port_info;
1608                 break;
1609         case IPATH_CMD_TID_UPDATE:
1610         case IPATH_CMD_TID_FREE:
1611                 copy = sizeof(cmd.cmd.tid_info);
1612                 dest = &cmd.cmd.tid_info;
1613                 src = &ucmd->cmd.tid_info;
1614                 break;
1615         case IPATH_CMD_SET_PART_KEY:
1616                 copy = sizeof(cmd.cmd.part_key);
1617                 dest = &cmd.cmd.part_key;
1618                 src = &ucmd->cmd.part_key;
1619                 break;
1620         default:
1621                 ret = -EINVAL;
1622                 goto bail;
1623         }
1624
1625         if ((count - consumed) < copy) {
1626                 ret = -EINVAL;
1627                 goto bail;
1628         }
1629
1630         if (copy_from_user(dest, src, copy)) {
1631                 ret = -EFAULT;
1632                 goto bail;
1633         }
1634
1635         consumed += copy;
1636         pd = port_fp(fp);
1637
1638         switch (cmd.type) {
1639         case IPATH_CMD_USER_INIT:
1640                 ret = ipath_do_user_init(pd, &cmd.cmd.user_info);
1641                 if (ret < 0)
1642                         goto bail;
1643                 ret = ipath_get_base_info(
1644                         pd, (void __user *) (unsigned long)
1645                         cmd.cmd.user_info.spu_base_info,
1646                         cmd.cmd.user_info.spu_base_info_size);
1647                 break;
1648         case IPATH_CMD_RECV_CTRL:
1649                 ret = ipath_manage_rcvq(pd, cmd.cmd.recv_ctrl);
1650                 break;
1651         case IPATH_CMD_PORT_INFO:
1652                 ret = ipath_port_info(pd,
1653                                       (struct ipath_port_info __user *)
1654                                       (unsigned long) cmd.cmd.port_info);
1655                 break;
1656         case IPATH_CMD_TID_UPDATE:
1657                 ret = ipath_tid_update(pd, &cmd.cmd.tid_info);
1658                 break;
1659         case IPATH_CMD_TID_FREE:
1660                 ret = ipath_tid_free(pd, &cmd.cmd.tid_info);
1661                 break;
1662         case IPATH_CMD_SET_PART_KEY:
1663                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
1664                 break;
1665         }
1666
1667         if (ret >= 0)
1668                 ret = consumed;
1669
1670 bail:
1671         return ret;
1672 }
1673
1674 static struct class *ipath_class;
1675
1676 static int init_cdev(int minor, char *name, struct file_operations *fops,
1677                      struct cdev **cdevp, struct class_device **class_devp)
1678 {
1679         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
1680         struct cdev *cdev = NULL;
1681         struct class_device *class_dev = NULL;
1682         int ret;
1683
1684         cdev = cdev_alloc();
1685         if (!cdev) {
1686                 printk(KERN_ERR IPATH_DRV_NAME
1687                        ": Could not allocate cdev for minor %d, %s\n",
1688                        minor, name);
1689                 ret = -ENOMEM;
1690                 goto done;
1691         }
1692
1693         cdev->owner = THIS_MODULE;
1694         cdev->ops = fops;
1695         kobject_set_name(&cdev->kobj, name);
1696
1697         ret = cdev_add(cdev, dev, 1);
1698         if (ret < 0) {
1699                 printk(KERN_ERR IPATH_DRV_NAME
1700                        ": Could not add cdev for minor %d, %s (err %d)\n",
1701                        minor, name, -ret);
1702                 goto err_cdev;
1703         }
1704
1705         class_dev = class_device_create(ipath_class, NULL, dev, NULL, name);
1706
1707         if (IS_ERR(class_dev)) {
1708                 ret = PTR_ERR(class_dev);
1709                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1710                        "class_dev for minor %d, %s (err %d)\n",
1711                        minor, name, -ret);
1712                 goto err_cdev;
1713         }
1714
1715         goto done;
1716
1717 err_cdev:
1718         cdev_del(cdev);
1719         cdev = NULL;
1720
1721 done:
1722         if (ret >= 0) {
1723                 *cdevp = cdev;
1724                 *class_devp = class_dev;
1725         } else {
1726                 *cdevp = NULL;
1727                 *class_devp = NULL;
1728         }
1729
1730         return ret;
1731 }
1732
1733 int ipath_cdev_init(int minor, char *name, struct file_operations *fops,
1734                     struct cdev **cdevp, struct class_device **class_devp)
1735 {
1736         return init_cdev(minor, name, fops, cdevp, class_devp);
1737 }
1738
1739 static void cleanup_cdev(struct cdev **cdevp,
1740                          struct class_device **class_devp)
1741 {
1742         struct class_device *class_dev = *class_devp;
1743
1744         if (class_dev) {
1745                 class_device_unregister(class_dev);
1746                 *class_devp = NULL;
1747         }
1748
1749         if (*cdevp) {
1750                 cdev_del(*cdevp);
1751                 *cdevp = NULL;
1752         }
1753 }
1754
1755 void ipath_cdev_cleanup(struct cdev **cdevp,
1756                         struct class_device **class_devp)
1757 {
1758         cleanup_cdev(cdevp, class_devp);
1759 }
1760
1761 static struct cdev *wildcard_cdev;
1762 static struct class_device *wildcard_class_dev;
1763
1764 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
1765
1766 static int user_init(void)
1767 {
1768         int ret;
1769
1770         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
1771         if (ret < 0) {
1772                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
1773                        "chrdev region (err %d)\n", -ret);
1774                 goto done;
1775         }
1776
1777         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
1778
1779         if (IS_ERR(ipath_class)) {
1780                 ret = PTR_ERR(ipath_class);
1781                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1782                        "device class (err %d)\n", -ret);
1783                 goto bail;
1784         }
1785
1786         goto done;
1787 bail:
1788         unregister_chrdev_region(dev, IPATH_NMINORS);
1789 done:
1790         return ret;
1791 }
1792
1793 static void user_cleanup(void)
1794 {
1795         if (ipath_class) {
1796                 class_destroy(ipath_class);
1797                 ipath_class = NULL;
1798         }
1799
1800         unregister_chrdev_region(dev, IPATH_NMINORS);
1801 }
1802
1803 static atomic_t user_count = ATOMIC_INIT(0);
1804 static atomic_t user_setup = ATOMIC_INIT(0);
1805
1806 int ipath_user_add(struct ipath_devdata *dd)
1807 {
1808         char name[10];
1809         int ret;
1810
1811         if (atomic_inc_return(&user_count) == 1) {
1812                 ret = user_init();
1813                 if (ret < 0) {
1814                         ipath_dev_err(dd, "Unable to set up user support: "
1815                                       "error %d\n", -ret);
1816                         goto bail;
1817                 }
1818                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
1819                                 &wildcard_class_dev);
1820                 if (ret < 0) {
1821                         ipath_dev_err(dd, "Could not create wildcard "
1822                                       "minor: error %d\n", -ret);
1823                         goto bail_user;
1824                 }
1825
1826                 atomic_set(&user_setup, 1);
1827         }
1828
1829         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
1830
1831         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
1832                         &dd->user_cdev, &dd->user_class_dev);
1833         if (ret < 0)
1834                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
1835                               dd->ipath_unit + 1, name);
1836
1837         goto bail;
1838
1839 bail_user:
1840         user_cleanup();
1841 bail:
1842         return ret;
1843 }
1844
1845 void ipath_user_remove(struct ipath_devdata *dd)
1846 {
1847         cleanup_cdev(&dd->user_cdev, &dd->user_class_dev);
1848
1849         if (atomic_dec_return(&user_count) == 0) {
1850                 if (atomic_read(&user_setup) == 0)
1851                         goto bail;
1852
1853                 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
1854                 user_cleanup();
1855
1856                 atomic_set(&user_setup, 0);
1857         }
1858 bail:
1859         return;
1860 }
1861