drivers/infiniband/hw/ipath/ipath_file_ops.c

   1 /*
   2  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/pci.h>
  34 #include <linux/poll.h>
  35 #include <linux/cdev.h>
  36 #include <linux/swap.h>
  37 #include <linux/vmalloc.h>
  38 #include <asm/pgtable.h>
  39
  40 #include "ipath_kernel.h"
  41 #include "ips_common.h"
  42 #include "ipath_layer.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_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
 126         kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
 127         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
 128                 (void *) dd->ipath_statusp -
 129                 (void *) dd->ipath_pioavailregs_dma;
 130         kinfo->spi_piobufbase = (u64) pd->port_piobufs;
 131         kinfo->__spi_uregbase =
 132                 dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
 133
 134         kinfo->spi_pioindex = dd->ipath_pbufsport * (pd->port_port - 1);
 135         kinfo->spi_piocnt = dd->ipath_pbufsport;
 136         kinfo->spi_pioalign = dd->ipath_palign;
 137
 138         kinfo->spi_qpair = IPATH_KD_QP;
 139         kinfo->spi_piosize = dd->ipath_ibmaxlen;
 140         kinfo->spi_mtu = dd->ipath_ibmaxlen;    /* maxlen, not ibmtu */
 141         kinfo->spi_port = pd->port_port;
 142         kinfo->spi_sw_version = IPATH_USER_SWVERSION;
 143         kinfo->spi_hw_version = dd->ipath_revision;
 144
 145         if (copy_to_user(ubase, kinfo, sizeof(*kinfo)))
 146                 ret = -EFAULT;
 147
 148 bail:
 149         kfree(kinfo);
 150         return ret;
 151 }
 152
 153 /**
 154  * ipath_tid_update - update a port TID
 155  * @pd: the port
 156  * @ti: the TID information
 157  *
 158  * The new implementation as of Oct 2004 is that the driver assigns
 159  * the tid and returns it to the caller.   To make it easier to
 160  * catch bugs, and to reduce search time, we keep a cursor for
 161  * each port, walking the shadow tid array to find one that's not
 162  * in use.
 163  *
 164  * For now, if we can't allocate the full list, we fail, although
 165  * in the long run, we'll allocate as many as we can, and the
 166  * caller will deal with that by trying the remaining pages later.
 167  * That means that when we fail, we have to mark the tids as not in
 168  * use again, in our shadow copy.
 169  *
 170  * It's up to the caller to free the tids when they are done.
 171  * We'll unlock the pages as they free them.
 172  *
 173  * Also, right now we are locking one page at a time, but since
 174  * the intended use of this routine is for a single group of
 175  * virtually contiguous pages, that should change to improve
 176  * performance.
 177  */
 178 static int ipath_tid_update(struct ipath_portdata *pd,
 179                             const struct ipath_tid_info *ti)
 180 {
 181         int ret = 0, ntids;
 182         u32 tid, porttid, cnt, i, tidcnt;
 183         u16 *tidlist;
 184         struct ipath_devdata *dd = pd->port_dd;
 185         u64 physaddr;
 186         unsigned long vaddr;
 187         u64 __iomem *tidbase;
 188         unsigned long tidmap[8];
 189         struct page **pagep = NULL;
 190
 191         if (!dd->ipath_pageshadow) {
 192                 ret = -ENOMEM;
 193                 goto done;
 194         }
 195
 196         cnt = ti->tidcnt;
 197         if (!cnt) {
 198                 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
 199                           (unsigned long long) ti->tidlist);
 200                 /*
 201                  * Should we treat as success?  likely a bug
 202                  */
 203                 ret = -EFAULT;
 204                 goto done;
 205         }
 206         tidcnt = dd->ipath_rcvtidcnt;
 207         if (cnt >= tidcnt) {
 208                 /* make sure it all fits in port_tid_pg_list */
 209                 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
 210                          "TIDs, only trying max (%u)\n", cnt, tidcnt);
 211                 cnt = tidcnt;
 212         }
 213         pagep = (struct page **)pd->port_tid_pg_list;
 214         tidlist = (u16 *) (&pagep[cnt]);
 215
 216         memset(tidmap, 0, sizeof(tidmap));
 217         tid = pd->port_tidcursor;
 218         /* before decrement; chip actual # */
 219         porttid = pd->port_port * tidcnt;
 220         ntids = tidcnt;
 221         tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
 222                                    dd->ipath_rcvtidbase +
 223                                    porttid * sizeof(*tidbase));
 224
 225         ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
 226                    pd->port_port, cnt, tid, tidbase);
 227
 228         /* virtual address of first page in transfer */
 229         vaddr = ti->tidvaddr;
 230         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
 231                        cnt * PAGE_SIZE)) {
 232                 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
 233                           (void *)vaddr, cnt);
 234                 ret = -EFAULT;
 235                 goto done;
 236         }
 237         ret = ipath_get_user_pages(vaddr, cnt, pagep);
 238         if (ret) {
 239                 if (ret == -EBUSY) {
 240                         ipath_dbg("Failed to lock addr %p, %u pages "
 241                                   "(already locked)\n",
 242                                   (void *) vaddr, cnt);
 243                         /*
 244                          * for now, continue, and see what happens but with
 245                          * the new implementation, this should never happen,
 246                          * unless perhaps the user has mpin'ed the pages
 247                          * themselves (something we need to test)
 248                          */
 249                         ret = 0;
 250                 } else {
 251                         dev_info(&dd->pcidev->dev,
 252                                  "Failed to lock addr %p, %u pages: "
 253                                  "errno %d\n", (void *) vaddr, cnt, -ret);
 254                         goto done;
 255                 }
 256         }
 257         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
 258                 for (; ntids--; tid++) {
 259                         if (tid == tidcnt)
 260                                 tid = 0;
 261                         if (!dd->ipath_pageshadow[porttid + tid])
 262                                 break;
 263                 }
 264                 if (ntids < 0) {
 265                         /*
 266                          * oops, wrapped all the way through their TIDs,
 267                          * and didn't have enough free; see comments at
 268                          * start of routine
 269                          */
 270                         ipath_dbg("Not enough free TIDs for %u pages "
 271                                   "(index %d), failing\n", cnt, i);
 272                         i--;    /* last tidlist[i] not filled in */
 273                         ret = -ENOMEM;
 274                         break;
 275                 }
 276                 tidlist[i] = tid;
 277                 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
 278                            "vaddr %lx\n", i, tid, vaddr);
 279                 /* we "know" system pages and TID pages are same size */
 280                 dd->ipath_pageshadow[porttid + tid] = pagep[i];
 281                 /*
 282                  * don't need atomic or it's overhead
 283                  */
 284                 __set_bit(tid, tidmap);
 285                 physaddr = page_to_phys(pagep[i]);
 286                 ipath_stats.sps_pagelocks++;
 287                 ipath_cdbg(VERBOSE,
 288                            "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
 289                            tid, vaddr, (unsigned long long) physaddr,
 290                            pagep[i]);
 291                 dd->ipath_f_put_tid(dd, &tidbase[tid], 1, physaddr);
 292                 /*
 293                  * don't check this tid in ipath_portshadow, since we
 294                  * just filled it in; start with the next one.
 295                  */
 296                 tid++;
 297         }
 298
 299         if (ret) {
 300                 u32 limit;
 301         cleanup:
 302                 /* jump here if copy out of updated info failed... */
 303                 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
 304                           -ret, i, cnt);
 305                 /* same code that's in ipath_free_tid() */
 306                 limit = sizeof(tidmap) * BITS_PER_BYTE;
 307                 if (limit > tidcnt)
 308                         /* just in case size changes in future */
 309                         limit = tidcnt;
 310                 tid = find_first_bit((const unsigned long *)tidmap, limit);
 311                 for (; tid < limit; tid++) {
 312                         if (!test_bit(tid, tidmap))
 313                                 continue;
 314                         if (dd->ipath_pageshadow[porttid + tid]) {
 315                                 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
 316                                            tid);
 317                                 dd->ipath_f_put_tid(dd, &tidbase[tid], 1,
 318                                                     dd->ipath_tidinvalid);
 319                                 dd->ipath_pageshadow[porttid + tid] = NULL;
 320                                 ipath_stats.sps_pageunlocks++;
 321                         }
 322                 }
 323                 ipath_release_user_pages(pagep, cnt);
 324         } else {
 325                 /*
 326                  * Copy the updated array, with ipath_tid's filled in, back
 327                  * to user.  Since we did the copy in already, this "should
 328                  * never fail" If it does, we have to clean up...
 329                  */
 330                 if (copy_to_user((void __user *)
 331                                  (unsigned long) ti->tidlist,
 332                                  tidlist, cnt * sizeof(*tidlist))) {
 333                         ret = -EFAULT;
 334                         goto cleanup;
 335                 }
 336                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
 337                                  tidmap, sizeof tidmap)) {
 338                         ret = -EFAULT;
 339                         goto cleanup;
 340                 }
 341                 if (tid == tidcnt)
 342                         tid = 0;
 343                 pd->port_tidcursor = tid;
 344         }
 345
 346 done:
 347         if (ret)
 348                 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
 349                           ti->tidcnt, -ret);
 350         return ret;
 351 }
 352
 353 /**
 354  * ipath_tid_free - free a port TID
 355  * @pd: the port
 356  * @ti: the TID info
 357  *
 358  * right now we are unlocking one page at a time, but since
 359  * the intended use of this routine is for a single group of
 360  * virtually contiguous pages, that should change to improve
 361  * performance.  We check that the TID is in range for this port
 362  * but otherwise don't check validity; if user has an error and
 363  * frees the wrong tid, it's only their own data that can thereby
 364  * be corrupted.  We do check that the TID was in use, for sanity
 365  * We always use our idea of the saved address, not the address that
 366  * they pass in to us.
 367  */
 368
 369 static int ipath_tid_free(struct ipath_portdata *pd,
 370                           const struct ipath_tid_info *ti)
 371 {
 372         int ret = 0;
 373         u32 tid, porttid, cnt, limit, tidcnt;
 374         struct ipath_devdata *dd = pd->port_dd;
 375         u64 __iomem *tidbase;
 376         unsigned long tidmap[8];
 377
 378         if (!dd->ipath_pageshadow) {
 379                 ret = -ENOMEM;
 380                 goto done;
 381         }
 382
 383         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
 384                            sizeof tidmap)) {
 385                 ret = -EFAULT;
 386                 goto done;
 387         }
 388
 389         porttid = pd->port_port * dd->ipath_rcvtidcnt;
 390         tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
 391                                    dd->ipath_rcvtidbase +
 392                                    porttid * sizeof(*tidbase));
 393
 394         tidcnt = dd->ipath_rcvtidcnt;
 395         limit = sizeof(tidmap) * BITS_PER_BYTE;
 396         if (limit > tidcnt)
 397                 /* just in case size changes in future */
 398                 limit = tidcnt;
 399         tid = find_first_bit(tidmap, limit);
 400         ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
 401                    "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
 402                    limit, tid, porttid);
 403         for (cnt = 0; tid < limit; tid++) {
 404                 /*
 405                  * small optimization; if we detect a run of 3 or so without
 406                  * any set, use find_first_bit again.  That's mainly to
 407                  * accelerate the case where we wrapped, so we have some at
 408                  * the beginning, and some at the end, and a big gap
 409                  * in the middle.
 410                  */
 411                 if (!test_bit(tid, tidmap))
 412                         continue;
 413                 cnt++;
 414                 if (dd->ipath_pageshadow[porttid + tid]) {
 415                         ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
 416                                    pd->port_pid, tid);
 417                         dd->ipath_f_put_tid(dd, &tidbase[tid], 1,
 418                                             dd->ipath_tidinvalid);
 419                         ipath_release_user_pages(
 420                                 &dd->ipath_pageshadow[porttid + tid], 1);
 421                         dd->ipath_pageshadow[porttid + tid] = NULL;
 422                         ipath_stats.sps_pageunlocks++;
 423                 } else
 424                         ipath_dbg("Unused tid %u, ignoring\n", tid);
 425         }
 426         if (cnt != ti->tidcnt)
 427                 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
 428                           ti->tidcnt, cnt);
 429 done:
 430         if (ret)
 431                 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
 432                           ti->tidcnt, -ret);
 433         return ret;
 434 }
 435
 436 /**
 437  * ipath_set_part_key - set a partition key
 438  * @pd: the port
 439  * @key: the key
 440  *
 441  * We can have up to 4 active at a time (other than the default, which is
 442  * always allowed).  This is somewhat tricky, since multiple ports may set
 443  * the same key, so we reference count them, and clean up at exit.  All 4
 444  * partition keys are packed into a single infinipath register.  It's an
 445  * error for a process to set the same pkey multiple times.  We provide no
 446  * mechanism to de-allocate a pkey at this time, we may eventually need to
 447  * do that.  I've used the atomic operations, and no locking, and only make
 448  * a single pass through what's available.  This should be more than
 449  * adequate for some time. I'll think about spinlocks or the like if and as
 450  * it's necessary.
 451  */
 452 static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
 453 {
 454         struct ipath_devdata *dd = pd->port_dd;
 455         int i, any = 0, pidx = -1;
 456         u16 lkey = key & 0x7FFF;
 457         int ret;
 458
 459         if (lkey == (IPS_DEFAULT_P_KEY & 0x7FFF)) {
 460                 /* nothing to do; this key always valid */
 461                 ret = 0;
 462                 goto bail;
 463         }
 464
 465         ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
 466                    "%hx:%x %hx:%x %hx:%x %hx:%x\n",
 467                    pd->port_port, key, dd->ipath_pkeys[0],
 468                    atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
 469                    atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
 470                    atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
 471                    atomic_read(&dd->ipath_pkeyrefs[3]));
 472
 473         if (!lkey) {
 474                 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
 475                            pd->port_port);
 476                 ret = -EINVAL;
 477                 goto bail;
 478         }
 479
 480         /*
 481          * Set the full membership bit, because it has to be
 482          * set in the register or the packet, and it seems
 483          * cleaner to set in the register than to force all
 484          * callers to set it. (see bug 4331)
 485          */
 486         key |= 0x8000;
 487
 488         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
 489                 if (!pd->port_pkeys[i] && pidx == -1)
 490                         pidx = i;
 491                 if (pd->port_pkeys[i] == key) {
 492                         ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
 493                                    "(%x) more than once\n",
 494                                    pd->port_port, key);
 495                         ret = -EEXIST;
 496                         goto bail;
 497                 }
 498         }
 499         if (pidx == -1) {
 500                 ipath_dbg("All pkeys for port %u already in use, "
 501                           "can't set %x\n", pd->port_port, key);
 502                 ret = -EBUSY;
 503                 goto bail;
 504         }
 505         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
 506                 if (!dd->ipath_pkeys[i]) {
 507                         any++;
 508                         continue;
 509                 }
 510                 if (dd->ipath_pkeys[i] == key) {
 511                         atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
 512
 513                         if (atomic_inc_return(pkrefs) > 1) {
 514                                 pd->port_pkeys[pidx] = key;
 515                                 ipath_cdbg(VERBOSE, "p%u set key %x "
 516                                            "matches #%d, count now %d\n",
 517                                            pd->port_port, key, i,
 518                                            atomic_read(pkrefs));
 519                                 ret = 0;
 520                                 goto bail;
 521                         } else {
 522                                 /*
 523                                  * lost race, decrement count, catch below
 524                                  */
 525                                 atomic_dec(pkrefs);
 526                                 ipath_cdbg(VERBOSE, "Lost race, count was "
 527                                            "0, after dec, it's %d\n",
 528                                            atomic_read(pkrefs));
 529                                 any++;
 530                         }
 531                 }
 532                 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
 533                         /*
 534                          * It makes no sense to have both the limited and
 535                          * full membership PKEY set at the same time since
 536                          * the unlimited one will disable the limited one.
 537                          */
 538                         ret = -EEXIST;
 539                         goto bail;
 540                 }
 541         }
 542         if (!any) {
 543                 ipath_dbg("port %u, all pkeys already in use, "
 544                           "can't set %x\n", pd->port_port, key);
 545                 ret = -EBUSY;
 546                 goto bail;
 547         }
 548         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
 549                 if (!dd->ipath_pkeys[i] &&
 550                     atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
 551                         u64 pkey;
 552
 553                         /* for ipathstats, etc. */
 554                         ipath_stats.sps_pkeys[i] = lkey;
 555                         pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
 556                         pkey =
 557                                 (u64) dd->ipath_pkeys[0] |
 558                                 ((u64) dd->ipath_pkeys[1] << 16) |
 559                                 ((u64) dd->ipath_pkeys[2] << 32) |
 560                                 ((u64) dd->ipath_pkeys[3] << 48);
 561                         ipath_cdbg(PROC, "p%u set key %x in #%d, "
 562                                    "portidx %d, new pkey reg %llx\n",
 563                                    pd->port_port, key, i, pidx,
 564                                    (unsigned long long) pkey);
 565                         ipath_write_kreg(
 566                                 dd, dd->ipath_kregs->kr_partitionkey, pkey);
 567
 568                         ret = 0;
 569                         goto bail;
 570                 }
 571         }
 572         ipath_dbg("port %u, all pkeys already in use 2nd pass, "
 573                   "can't set %x\n", pd->port_port, key);
 574         ret = -EBUSY;
 575
 576 bail:
 577         return ret;
 578 }
 579
 580 /**
 581  * ipath_manage_rcvq - manage a port's receive queue
 582  * @pd: the port
 583  * @start_stop: action to carry out
 584  *
 585  * start_stop == 0 disables receive on the port, for use in queue
 586  * overflow conditions.  start_stop==1 re-enables, to be used to
 587  * re-init the software copy of the head register
 588  */
 589 static int ipath_manage_rcvq(struct ipath_portdata *pd, int start_stop)
 590 {
 591         struct ipath_devdata *dd = pd->port_dd;
 592         u64 tval;
 593
 594         ipath_cdbg(PROC, "%sabling rcv for unit %u port %u\n",
 595                    start_stop ? "en" : "dis", dd->ipath_unit,
 596                    pd->port_port);
 597         /* atomically clear receive enable port. */
 598         if (start_stop) {
 599                 /*
 600                  * On enable, force in-memory copy of the tail register to
 601                  * 0, so that protocol code doesn't have to worry about
 602                  * whether or not the chip has yet updated the in-memory
 603                  * copy or not on return from the system call. The chip
 604                  * always resets it's tail register back to 0 on a
 605                  * transition from disabled to enabled.  This could cause a
 606                  * problem if software was broken, and did the enable w/o
 607                  * the disable, but eventually the in-memory copy will be
 608                  * updated and correct itself, even in the face of software
 609                  * bugs.
 610                  */
 611                 *pd->port_rcvhdrtail_kvaddr = 0;
 612                 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
 613                         &dd->ipath_rcvctrl);
 614         } else
 615                 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
 616                           &dd->ipath_rcvctrl);
 617         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 618                          dd->ipath_rcvctrl);
 619         /* now be sure chip saw it before we return */
 620         tval = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 621         if (start_stop) {
 622                 /*
 623                  * And try to be sure that tail reg update has happened too.
 624                  * This should in theory interlock with the RXE changes to
 625                  * the tail register.  Don't assign it to the tail register
 626                  * in memory copy, since we could overwrite an update by the
 627                  * chip if we did.
 628                  */
 629                 tval = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
 630         }
 631         /* always; new head should be equal to new tail; see above */
 632         return 0;
 633 }
 634
 635 static void ipath_clean_part_key(struct ipath_portdata *pd,
 636                                  struct ipath_devdata *dd)
 637 {
 638         int i, j, pchanged = 0;
 639         u64 oldpkey;
 640
 641         /* for debugging only */
 642         oldpkey = (u64) dd->ipath_pkeys[0] |
 643                 ((u64) dd->ipath_pkeys[1] << 16) |
 644                 ((u64) dd->ipath_pkeys[2] << 32) |
 645                 ((u64) dd->ipath_pkeys[3] << 48);
 646
 647         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
 648                 if (!pd->port_pkeys[i])
 649                         continue;
 650                 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
 651                            pd->port_pkeys[i]);
 652                 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
 653                         /* check for match independent of the global bit */
 654                         if ((dd->ipath_pkeys[j] & 0x7fff) !=
 655                             (pd->port_pkeys[i] & 0x7fff))
 656                                 continue;
 657                         if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
 658                                 ipath_cdbg(VERBOSE, "p%u clear key "
 659                                            "%x matches #%d\n",
 660                                            pd->port_port,
 661                                            pd->port_pkeys[i], j);
 662                                 ipath_stats.sps_pkeys[j] =
 663                                         dd->ipath_pkeys[j] = 0;
 664                                 pchanged++;
 665                         }
 666                         else ipath_cdbg(
 667                                 VERBOSE, "p%u key %x matches #%d, "
 668                                 "but ref still %d\n", pd->port_port,
 669                                 pd->port_pkeys[i], j,
 670                                 atomic_read(&dd->ipath_pkeyrefs[j]));
 671                         break;
 672                 }
 673                 pd->port_pkeys[i] = 0;
 674         }
 675         if (pchanged) {
 676                 u64 pkey = (u64) dd->ipath_pkeys[0] |
 677                         ((u64) dd->ipath_pkeys[1] << 16) |
 678                         ((u64) dd->ipath_pkeys[2] << 32) |
 679                         ((u64) dd->ipath_pkeys[3] << 48);
 680                 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
 681                            "new pkey reg %llx\n", pd->port_port,
 682                            (unsigned long long) oldpkey,
 683                            (unsigned long long) pkey);
 684                 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
 685                                  pkey);
 686         }
 687 }
 688
 689 /**
 690  * ipath_create_user_egr - allocate eager TID buffers
 691  * @pd: the port to allocate TID buffers for
 692  *
 693  * This routine is now quite different for user and kernel, because
 694  * the kernel uses skb's, for the accelerated network performance
 695  * This is the user port version
 696  *
 697  * Allocate the eager TID buffers and program them into infinipath
 698  * They are no longer completely contiguous, we do multiple allocation
 699  * calls.
 700  */
 701 static int ipath_create_user_egr(struct ipath_portdata *pd)
 702 {
 703         struct ipath_devdata *dd = pd->port_dd;
 704         unsigned e, egrcnt, alloced, egrperchunk, chunk, egrsize, egroff;
 705         size_t size;
 706         int ret;
 707
 708         egrcnt = dd->ipath_rcvegrcnt;
 709         /* TID number offset for this port */
 710         egroff = pd->port_port * egrcnt;
 711         egrsize = dd->ipath_rcvegrbufsize;
 712         ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
 713                    "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
 714
 715         /*
 716          * to avoid wasting a lot of memory, we allocate 32KB chunks of
 717          * physically contiguous memory, advance through it until used up
 718          * and then allocate more.  Of course, we need memory to store those
 719          * extra pointers, now.  Started out with 256KB, but under heavy
 720          * memory pressure (creating large files and then copying them over
 721          * NFS while doing lots of MPI jobs), we hit some allocation
 722          * failures, even though we can sleep...  (2.6.10) Still get
 723          * failures at 64K.  32K is the lowest we can go without waiting
 724          * more memory again.  It seems likely that the coalescing in
 725          * free_pages, etc. still has issues (as it has had previously
 726          * during 2.6.x development).
 727          */
 728         size = 0x8000;
 729         alloced = ALIGN(egrsize * egrcnt, size);
 730         egrperchunk = size / egrsize;
 731         chunk = (egrcnt + egrperchunk - 1) / egrperchunk;
 732         pd->port_rcvegrbuf_chunks = chunk;
 733         pd->port_rcvegrbufs_perchunk = egrperchunk;
 734         pd->port_rcvegrbuf_size = size;
 735         pd->port_rcvegrbuf = vmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]));
 736         if (!pd->port_rcvegrbuf) {
 737                 ret = -ENOMEM;
 738                 goto bail;
 739         }
 740         pd->port_rcvegrbuf_phys =
 741                 vmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]));
 742         if (!pd->port_rcvegrbuf_phys) {
 743                 ret = -ENOMEM;
 744                 goto bail_rcvegrbuf;
 745         }
 746         for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
 747                 /*
 748                  * GFP_USER, but without GFP_FS, so buffer cache can be
 749                  * coalesced (we hope); otherwise, even at order 4,
 750                  * heavy filesystem activity makes these fail
 751                  */
 752                 gfp_t gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
 753
 754                 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
 755                         &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
 756                         gfp_flags);
 757
 758                 if (!pd->port_rcvegrbuf[e]) {
 759                         ret = -ENOMEM;
 760                         goto bail_rcvegrbuf_phys;
 761                 }
 762         }
 763
 764         pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
 765
 766         for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
 767                 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
 768                 unsigned i;
 769
 770                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
 771                         dd->ipath_f_put_tid(dd, e + egroff +
 772                                             (u64 __iomem *)
 773                                             ((char __iomem *)
 774                                              dd->ipath_kregbase +
 775                                              dd->ipath_rcvegrbase), 0, pa);
 776                         pa += egrsize;
 777                 }
 778                 cond_resched(); /* don't hog the cpu */
 779         }
 780
 781         ret = 0;
 782         goto bail;
 783
 784 bail_rcvegrbuf_phys:
 785         for (e = 0; e < pd->port_rcvegrbuf_chunks &&
 786                      pd->port_rcvegrbuf[e]; e++)
 787                 dma_free_coherent(&dd->pcidev->dev, size,
 788                                   pd->port_rcvegrbuf[e],
 789                                   pd->port_rcvegrbuf_phys[e]);
 790
 791         vfree(pd->port_rcvegrbuf_phys);
 792         pd->port_rcvegrbuf_phys = NULL;
 793 bail_rcvegrbuf:
 794         vfree(pd->port_rcvegrbuf);
 795         pd->port_rcvegrbuf = NULL;
 796 bail:
 797         return ret;
 798 }
 799
 800 static int ipath_do_user_init(struct ipath_portdata *pd,
 801                               const struct ipath_user_info *uinfo)
 802 {
 803         int ret = 0;
 804         struct ipath_devdata *dd = pd->port_dd;
 805         u64 physaddr, uaddr, off, atmp;
 806         struct page *pagep;
 807         u32 head32;
 808         u64 head;
 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         /* set up for the rcvhdr Q tail register writeback to user memory */
 834         if (!uinfo->spu_rcvhdraddr ||
 835             !access_ok(VERIFY_WRITE, (u64 __user *) (unsigned long)
 836                        uinfo->spu_rcvhdraddr, sizeof(u64))) {
 837                 ipath_dbg("Port %d rcvhdrtail addr %llx not valid\n",
 838                           pd->port_port,
 839                           (unsigned long long) uinfo->spu_rcvhdraddr);
 840                 ret = -EINVAL;
 841                 goto done;
 842         }
 843
 844         off = offset_in_page(uinfo->spu_rcvhdraddr);
 845         uaddr = PAGE_MASK & (unsigned long) uinfo->spu_rcvhdraddr;
 846         ret = ipath_get_user_pages_nocopy(uaddr, &pagep);
 847         if (ret) {
 848                 dev_info(&dd->pcidev->dev, "Failed to lookup and lock "
 849                          "address %llx for rcvhdrtail: errno %d\n",
 850                          (unsigned long long) uinfo->spu_rcvhdraddr, -ret);
 851                 goto done;
 852         }
 853         ipath_stats.sps_pagelocks++;
 854         pd->port_rcvhdrtail_uaddr = uaddr;
 855         pd->port_rcvhdrtail_pagep = pagep;
 856         pd->port_rcvhdrtail_kvaddr =
 857                 page_address(pagep);
 858         pd->port_rcvhdrtail_kvaddr += off;
 859         physaddr = page_to_phys(pagep) + off;
 860         ipath_cdbg(VERBOSE, "port %d user addr %llx hdrtailaddr, %llx "
 861                    "physical (off=%llx)\n",
 862                    pd->port_port,
 863                    (unsigned long long) uinfo->spu_rcvhdraddr,
 864                    (unsigned long long) physaddr, (unsigned long long) off);
 865         ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
 866                               pd->port_port, physaddr);
 867         atmp = ipath_read_kreg64_port(dd,
 868                                       dd->ipath_kregs->kr_rcvhdrtailaddr,
 869                                       pd->port_port);
 870         if (physaddr != atmp) {
 871                 ipath_dev_err(dd,
 872                               "Catastrophic software error, "
 873                               "RcvHdrTailAddr%u written as %llx, "
 874                               "read back as %llx\n", pd->port_port,
 875                               (unsigned long long) physaddr,
 876                               (unsigned long long) atmp);
 877                 ret = -EINVAL;
 878                 goto done;
 879         }
 880
 881         /* for right now, kernel piobufs are at end, so port 1 is at 0 */
 882         pd->port_piobufs = dd->ipath_piobufbase +
 883                 dd->ipath_pbufsport * (pd->port_port -
 884                                        1) * dd->ipath_palign;
 885         ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n",
 886                    pd->port_port, pd->port_piobufs);
 887
 888         /*
 889          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
 890          * array for time being.  If pd->port_port > chip-supported,
 891          * we need to do extra stuff here to handle by handling overflow
 892          * through port 0, someday
 893          */
 894         ret = ipath_create_rcvhdrq(dd, pd);
 895         if (!ret)
 896                 ret = ipath_create_user_egr(pd);
 897         if (ret)
 898                 goto done;
 899         /* enable receives now */
 900         /* atomically set enable bit for this port */
 901         set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
 902                 &dd->ipath_rcvctrl);
 903
 904         /*
 905          * set the head registers for this port to the current values
 906          * of the tail pointers, since we don't know if they were
 907          * updated on last use of the port.
 908          */
 909         head32 = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
 910         head = (u64) head32;
 911         ipath_write_ureg(dd, ur_rcvhdrhead, head, pd->port_port);
 912         head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
 913         ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
 914         dd->ipath_lastegrheads[pd->port_port] = -1;
 915         dd->ipath_lastrcvhdrqtails[pd->port_port] = -1;
 916         ipath_cdbg(VERBOSE, "Wrote port%d head %llx, egrhead %x from "
 917                    "tail regs\n", pd->port_port,
 918                    (unsigned long long) head, head32);
 919         pd->port_tidcursor = 0; /* start at beginning after open */
 920         /*
 921          * now enable the port; the tail registers will be written to memory
 922          * by the chip as soon as it sees the write to
 923          * dd->ipath_kregs->kr_rcvctrl.  The update only happens on
 924          * transition from 0 to 1, so clear it first, then set it as part of
 925          * enabling the port.  This will (very briefly) affect any other
 926          * open ports, but it shouldn't be long enough to be an issue.
 927          */
 928         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 929                          dd->ipath_rcvctrl & ~INFINIPATH_R_TAILUPD);
 930         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 931                          dd->ipath_rcvctrl);
 932
 933 done:
 934         return ret;
 935 }
 936
 937 static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
 938                      u64 ureg)
 939 {
 940         unsigned long phys;
 941         int ret;
 942
 943         /* it's the real hardware, so io_remap works */
 944
 945         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
 946                 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
 947                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
 948                 ret = -EFAULT;
 949         } else {
 950                 phys = dd->ipath_physaddr + ureg;
 951                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 952
 953                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
 954                 ret = io_remap_pfn_range(vma, vma->vm_start,
 955                                          phys >> PAGE_SHIFT,
 956                                          vma->vm_end - vma->vm_start,
 957                                          vma->vm_page_prot);
 958         }
 959         return ret;
 960 }
 961
 962 static int mmap_piobufs(struct vm_area_struct *vma,
 963                         struct ipath_devdata *dd,
 964                         struct ipath_portdata *pd)
 965 {
 966         unsigned long phys;
 967         int ret;
 968
 969         /*
 970          * When we map the PIO buffers, we want to map them as writeonly, no
 971          * read possible.
 972          */
 973
 974         if ((vma->vm_end - vma->vm_start) >
 975             (dd->ipath_pbufsport * dd->ipath_palign)) {
 976                 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
 977                          "reqlen %lx > PAGE\n",
 978                          vma->vm_end - vma->vm_start);
 979                 ret = -EFAULT;
 980                 goto bail;
 981         }
 982
 983         phys = dd->ipath_physaddr + pd->port_piobufs;
 984         /*
 985          * Do *NOT* mark this as non-cached (PWT bit), or we don't get the
 986          * write combining behavior we want on the PIO buffers!
 987          * vma->vm_page_prot =
 988          *        pgprot_noncached(vma->vm_page_prot);
 989          */
 990
 991         if (vma->vm_flags & VM_READ) {
 992                 dev_info(&dd->pcidev->dev,
 993                          "Can't map piobufs as readable (flags=%lx)\n",
 994                          vma->vm_flags);
 995                 ret = -EPERM;
 996                 goto bail;
 997         }
 998
 999         /* don't allow them to later change to readable with mprotect */
1000
1001         vma->vm_flags &= ~VM_MAYWRITE;
1002         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1003
1004         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1005                                  vma->vm_end - vma->vm_start,
1006                                  vma->vm_page_prot);
1007 bail:
1008         return ret;
1009 }
1010
1011 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1012                            struct ipath_portdata *pd)
1013 {
1014         struct ipath_devdata *dd = pd->port_dd;
1015         unsigned long start, size;
1016         size_t total_size, i;
1017         dma_addr_t *phys;
1018         int ret;
1019
1020         if (!pd->port_rcvegrbuf) {
1021                 ret = -EFAULT;
1022                 goto bail;
1023         }
1024
1025         size = pd->port_rcvegrbuf_size;
1026         total_size = pd->port_rcvegrbuf_chunks * size;
1027         if ((vma->vm_end - vma->vm_start) > total_size) {
1028                 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1029                          "reqlen %lx > actual %lx\n",
1030                          vma->vm_end - vma->vm_start,
1031                          (unsigned long) total_size);
1032                 ret = -EFAULT;
1033                 goto bail;
1034         }
1035
1036         if (vma->vm_flags & VM_WRITE) {
1037                 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1038                          "writable (flags=%lx)\n", vma->vm_flags);
1039                 ret = -EPERM;
1040                 goto bail;
1041         }
1042
1043         start = vma->vm_start;
1044         phys = pd->port_rcvegrbuf_phys;
1045
1046         /* don't allow them to later change to writeable with mprotect */
1047         vma->vm_flags &= ~VM_MAYWRITE;
1048
1049         for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1050                 ret = remap_pfn_range(vma, start, phys[i] >> PAGE_SHIFT,
1051                                       size, vma->vm_page_prot);
1052                 if (ret < 0)
1053                         goto bail;
1054         }
1055         ret = 0;
1056
1057 bail:
1058         return ret;
1059 }
1060
1061 static int mmap_rcvhdrq(struct vm_area_struct *vma,
1062                         struct ipath_portdata *pd)
1063 {
1064         struct ipath_devdata *dd = pd->port_dd;
1065         size_t total_size;
1066         int ret;
1067
1068         /*
1069          * kmalloc'ed memory, physically contiguous; this is from
1070          * spi_rcvhdr_base; we allow user to map read-write so they can
1071          * write hdrq entries to allow protocol code to directly poll
1072          * whether a hdrq entry has been written.
1073          */
1074         total_size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1075                            sizeof(u32), PAGE_SIZE);
1076         if ((vma->vm_end - vma->vm_start) > total_size) {
1077                 dev_info(&dd->pcidev->dev,
1078                          "FAIL on rcvhdrq: reqlen %lx > actual %lx\n",
1079                          vma->vm_end - vma->vm_start,
1080                          (unsigned long) total_size);
1081                 ret = -EFAULT;
1082                 goto bail;
1083         }
1084
1085         ret = remap_pfn_range(vma, vma->vm_start,
1086                               pd->port_rcvhdrq_phys >> PAGE_SHIFT,
1087                               vma->vm_end - vma->vm_start,
1088                               vma->vm_page_prot);
1089 bail:
1090         return ret;
1091 }
1092
1093 static int mmap_pioavailregs(struct vm_area_struct *vma,
1094                              struct ipath_portdata *pd)
1095 {
1096         struct ipath_devdata *dd = pd->port_dd;
1097         int ret;
1098
1099         /*
1100          * when we map the PIO bufferavail registers, we want to map them as
1101          * readonly, no write possible.
1102          *
1103          * kmalloc'ed memory, physically contiguous, one page only, readonly
1104          */
1105
1106         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1107                 dev_info(&dd->pcidev->dev, "FAIL on pioavailregs_dma: "
1108                          "reqlen %lx > actual %lx\n",
1109                          vma->vm_end - vma->vm_start,
1110                          (unsigned long) PAGE_SIZE);
1111                 ret = -EFAULT;
1112                 goto bail;
1113         }
1114
1115         if (vma->vm_flags & VM_WRITE) {
1116                 dev_info(&dd->pcidev->dev,
1117                          "Can't map pioavailregs as writable (flags=%lx)\n",
1118                          vma->vm_flags);
1119                 ret = -EPERM;
1120                 goto bail;
1121         }
1122
1123         /* don't allow them to later change with mprotect */
1124         vma->vm_flags &= ~VM_MAYWRITE;
1125
1126         ret = remap_pfn_range(vma, vma->vm_start,
1127                               dd->ipath_pioavailregs_phys >> PAGE_SHIFT,
1128                               PAGE_SIZE, vma->vm_page_prot);
1129 bail:
1130         return ret;
1131 }
1132
1133 /**
1134  * ipath_mmap - mmap various structures into user space
1135  * @fp: the file pointer
1136  * @vma: the VM area
1137  *
1138  * We use this to have a shared buffer between the kernel and the user code
1139  * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1140  * buffers in the chip.  We have the open and close entries so we can bump
1141  * the ref count and keep the driver from being unloaded while still mapped.
1142  */
1143 static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1144 {
1145         struct ipath_portdata *pd;
1146         struct ipath_devdata *dd;
1147         u64 pgaddr, ureg;
1148         int ret;
1149
1150         pd = port_fp(fp);
1151         dd = pd->port_dd;
1152         /*
1153          * This is the ipath_do_user_init() code, mapping the shared buffers
1154          * into the user process. The address referred to by vm_pgoff is the
1155          * virtual, not physical, address; we only do one mmap for each
1156          * space mapped.
1157          */
1158         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1159
1160         /*
1161          * note that ureg does *NOT* have the kregvirt as part of it, to be
1162          * sure that for 32 bit programs, we don't end up trying to map a >
1163          * 44 address.  Has to match ipath_get_base_info() code that sets
1164          * __spi_uregbase
1165          */
1166
1167         ureg = dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
1168
1169         ipath_cdbg(MM, "ushare: pgaddr %llx vm_start=%lx, vmlen %lx\n",
1170                    (unsigned long long) pgaddr, vma->vm_start,
1171                    vma->vm_end - vma->vm_start);
1172
1173         if (pgaddr == ureg)
1174                 ret = mmap_ureg(vma, dd, ureg);
1175         else if (pgaddr == pd->port_piobufs)
1176                 ret = mmap_piobufs(vma, dd, pd);
1177         else if (pgaddr == (u64) pd->port_rcvegr_phys)
1178                 ret = mmap_rcvegrbufs(vma, pd);
1179         else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1180                 ret = mmap_rcvhdrq(vma, pd);
1181         else if (pgaddr == dd->ipath_pioavailregs_phys)
1182                 ret = mmap_pioavailregs(vma, pd);
1183         else
1184                 ret = -EINVAL;
1185
1186         vma->vm_private_data = NULL;
1187
1188         if (ret < 0)
1189                 dev_info(&dd->pcidev->dev,
1190                          "Failure %d on addr %lx, off %lx\n",
1191                          -ret, vma->vm_start, vma->vm_pgoff);
1192
1193         return ret;
1194 }
1195
1196 static unsigned int ipath_poll(struct file *fp,
1197                                struct poll_table_struct *pt)
1198 {
1199         struct ipath_portdata *pd;
1200         u32 head, tail;
1201         int bit;
1202         struct ipath_devdata *dd;
1203
1204         pd = port_fp(fp);
1205         dd = pd->port_dd;
1206
1207         bit = pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT;
1208         set_bit(bit, &dd->ipath_rcvctrl);
1209
1210         /*
1211          * Before blocking, make sure that head is still == tail,
1212          * reading from the chip, so we can be sure the interrupt
1213          * enable has made it to the chip.  If not equal, disable
1214          * interrupt again and return immediately.  This avoids races,
1215          * and the overhead of the chip read doesn't matter much at
1216          * this point, since we are waiting for something anyway.
1217          */
1218
1219         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1220                          dd->ipath_rcvctrl);
1221
1222         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1223         tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1224
1225         if (tail == head) {
1226                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1227                 poll_wait(fp, &pd->port_wait, pt);
1228
1229                 if (test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) {
1230                         /* timed out, no packets received */
1231                         clear_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1232                         pd->port_rcvwait_to++;
1233                 }
1234         }
1235         else {
1236                 /* it's already happened; don't do wait_event overhead */
1237                 pd->port_rcvnowait++;
1238         }
1239
1240         clear_bit(bit, &dd->ipath_rcvctrl);
1241         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1242                          dd->ipath_rcvctrl);
1243
1244         return 0;
1245 }
1246
1247 static int try_alloc_port(struct ipath_devdata *dd, int port,
1248                           struct file *fp)
1249 {
1250         int ret;
1251
1252         if (!dd->ipath_pd[port]) {
1253                 void *p, *ptmp;
1254
1255                 p = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1256
1257                 /*
1258                  * Allocate memory for use in ipath_tid_update() just once
1259                  * at open, not per call.  Reduces cost of expected send
1260                  * setup.
1261                  */
1262                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1263                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1264                                GFP_KERNEL);
1265                 if (!p || !ptmp) {
1266                         ipath_dev_err(dd, "Unable to allocate portdata "
1267                                       "memory, failing open\n");
1268                         ret = -ENOMEM;
1269                         kfree(p);
1270                         kfree(ptmp);
1271                         goto bail;
1272                 }
1273                 dd->ipath_pd[port] = p;
1274                 dd->ipath_pd[port]->port_port = port;
1275                 dd->ipath_pd[port]->port_dd = dd;
1276                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1277                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1278         }
1279         if (!dd->ipath_pd[port]->port_cnt) {
1280                 dd->ipath_pd[port]->port_cnt = 1;
1281                 fp->private_data = (void *) dd->ipath_pd[port];
1282                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1283                            current->comm, current->pid, dd->ipath_unit,
1284                            port);
1285                 dd->ipath_pd[port]->port_pid = current->pid;
1286                 strncpy(dd->ipath_pd[port]->port_comm, current->comm,
1287                         sizeof(dd->ipath_pd[port]->port_comm));
1288                 ipath_stats.sps_ports++;
1289                 ret = 0;
1290                 goto bail;
1291         }
1292         ret = -EBUSY;
1293
1294 bail:
1295         return ret;
1296 }
1297
1298 static inline int usable(struct ipath_devdata *dd)
1299 {
1300         return dd &&
1301                 (dd->ipath_flags & IPATH_PRESENT) &&
1302                 dd->ipath_kregbase &&
1303                 dd->ipath_lid &&
1304                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1305                                      | IPATH_LINKUNK));
1306 }
1307
1308 static int find_free_port(int unit, struct file *fp)
1309 {
1310         struct ipath_devdata *dd = ipath_lookup(unit);
1311         int ret, i;
1312
1313         if (!dd) {
1314                 ret = -ENODEV;
1315                 goto bail;
1316         }
1317
1318         if (!usable(dd)) {
1319                 ret = -ENETDOWN;
1320                 goto bail;
1321         }
1322
1323         for (i = 0; i < dd->ipath_cfgports; i++) {
1324                 ret = try_alloc_port(dd, i, fp);
1325                 if (ret != -EBUSY)
1326                         goto bail;
1327         }
1328         ret = -EBUSY;
1329
1330 bail:
1331         return ret;
1332 }
1333
1334 static int find_best_unit(struct file *fp)
1335 {
1336         int ret = 0, i, prefunit = -1, devmax;
1337         int maxofallports, npresent, nup;
1338         int ndev;
1339
1340         (void) ipath_count_units(&npresent, &nup, &maxofallports);
1341
1342         /*
1343          * This code is present to allow a knowledgeable person to
1344          * specify the layout of processes to processors before opening
1345          * this driver, and then we'll assign the process to the "closest"
1346          * HT-400 to that processor (we assume reasonable connectivity,
1347          * for now).  This code assumes that if affinity has been set
1348          * before this point, that at most one cpu is set; for now this
1349          * is reasonable.  I check for both cpus_empty() and cpus_full(),
1350          * in case some kernel variant sets none of the bits when no
1351          * affinity is set.  2.6.11 and 12 kernels have all present
1352          * cpus set.  Some day we'll have to fix it up further to handle
1353          * a cpu subset.  This algorithm fails for two HT-400's connected
1354          * in tunnel fashion.  Eventually this needs real topology
1355          * information.  There may be some issues with dual core numbering
1356          * as well.  This needs more work prior to release.
1357          */
1358         if (!cpus_empty(current->cpus_allowed) &&
1359             !cpus_full(current->cpus_allowed)) {
1360                 int ncpus = num_online_cpus(), curcpu = -1;
1361                 for (i = 0; i < ncpus; i++)
1362                         if (cpu_isset(i, current->cpus_allowed)) {
1363                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1364                                            "cpu %d\n", current->comm,
1365                                            current->pid, i);
1366                                 curcpu = i;
1367                         }
1368                 if (curcpu != -1) {
1369                         if (npresent) {
1370                                 prefunit = curcpu / (ncpus / npresent);
1371                                 ipath_dbg("%s[%u] %d chips, %d cpus, "
1372                                           "%d cpus/chip, select unit %d\n",
1373                                           current->comm, current->pid,
1374                                           npresent, ncpus, ncpus / npresent,
1375                                           prefunit);
1376                         }
1377                 }
1378         }
1379
1380         /*
1381          * user ports start at 1, kernel port is 0
1382          * For now, we do round-robin access across all chips
1383          */
1384
1385         if (prefunit != -1)
1386                 devmax = prefunit + 1;
1387         else
1388                 devmax = ipath_count_units(NULL, NULL, NULL);
1389 recheck:
1390         for (i = 1; i < maxofallports; i++) {
1391                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1392                      ndev++) {
1393                         struct ipath_devdata *dd = ipath_lookup(ndev);
1394
1395                         if (!usable(dd))
1396                                 continue; /* can't use this unit */
1397                         if (i >= dd->ipath_cfgports)
1398                                 /*
1399                                  * Maxed out on users of this unit. Try
1400                                  * next.
1401                                  */
1402                                 continue;
1403                         ret = try_alloc_port(dd, i, fp);
1404                         if (!ret)
1405                                 goto done;
1406                 }
1407         }
1408
1409         if (npresent) {
1410                 if (nup == 0) {
1411                         ret = -ENETDOWN;
1412                         ipath_dbg("No ports available (none initialized "
1413                                   "and ready)\n");
1414                 } else {
1415                         if (prefunit > 0) {
1416                                 /* if started above 0, retry from 0 */
1417                                 ipath_cdbg(PROC,
1418                                            "%s[%u] no ports on prefunit "
1419                                            "%d, clear and re-check\n",
1420                                            current->comm, current->pid,
1421                                            prefunit);
1422                                 devmax = ipath_count_units(NULL, NULL,
1423                                                            NULL);
1424                                 prefunit = -1;
1425                                 goto recheck;
1426                         }
1427                         ret = -EBUSY;
1428                         ipath_dbg("No ports available\n");
1429                 }
1430         } else {
1431                 ret = -ENXIO;
1432                 ipath_dbg("No boards found\n");
1433         }
1434
1435 done:
1436         return ret;
1437 }
1438
1439 static int ipath_open(struct inode *in, struct file *fp)
1440 {
1441         int ret, minor;
1442
1443         mutex_lock(&ipath_mutex);
1444
1445         minor = iminor(in);
1446         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1447                    (long)in->i_rdev, minor);
1448
1449         if (minor)
1450                 ret = find_free_port(minor - 1, fp);
1451         else
1452                 ret = find_best_unit(fp);
1453
1454         mutex_unlock(&ipath_mutex);
1455         return ret;
1456 }
1457
1458 /**
1459  * unlock_exptid - unlock any expected TID entries port still had in use
1460  * @pd: port
1461  *
1462  * We don't actually update the chip here, because we do a bulk update
1463  * below, using ipath_f_clear_tids.
1464  */
1465 static void unlock_expected_tids(struct ipath_portdata *pd)
1466 {
1467         struct ipath_devdata *dd = pd->port_dd;
1468         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
1469         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
1470
1471         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
1472                    pd->port_port);
1473         for (i = port_tidbase; i < maxtid; i++) {
1474                 if (!dd->ipath_pageshadow[i])
1475                         continue;
1476
1477                 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i],
1478                                                   1);
1479                 dd->ipath_pageshadow[i] = NULL;
1480                 cnt++;
1481                 ipath_stats.sps_pageunlocks++;
1482         }
1483         if (cnt)
1484                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
1485                            pd->port_port, cnt);
1486
1487         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
1488                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
1489                            (unsigned long long) ipath_stats.sps_pagelocks,
1490                            (unsigned long long)
1491                            ipath_stats.sps_pageunlocks);
1492 }
1493
1494 static int ipath_close(struct inode *in, struct file *fp)
1495 {
1496         int ret = 0;
1497         struct ipath_portdata *pd;
1498         struct ipath_devdata *dd;
1499         unsigned port;
1500
1501         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
1502                    (long)in->i_rdev, fp->private_data);
1503
1504         mutex_lock(&ipath_mutex);
1505
1506         pd = port_fp(fp);
1507         port = pd->port_port;
1508         fp->private_data = NULL;
1509         dd = pd->port_dd;
1510
1511         if (pd->port_hdrqfull) {
1512                 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
1513                            "during run\n", pd->port_comm, pd->port_pid,
1514                            pd->port_hdrqfull);
1515                 pd->port_hdrqfull = 0;
1516         }
1517
1518         if (pd->port_rcvwait_to || pd->port_piowait_to
1519             || pd->port_rcvnowait || pd->port_pionowait) {
1520                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
1521                            "%u rcv %u, pio already\n",
1522                            pd->port_port, pd->port_rcvwait_to,
1523                            pd->port_piowait_to, pd->port_rcvnowait,
1524                            pd->port_pionowait);
1525                 pd->port_rcvwait_to = pd->port_piowait_to =
1526                         pd->port_rcvnowait = pd->port_pionowait = 0;
1527         }
1528         if (pd->port_flag) {
1529                 ipath_dbg("port %u port_flag still set to 0x%lx\n",
1530                           pd->port_port, pd->port_flag);
1531                 pd->port_flag = 0;
1532         }
1533
1534         if (dd->ipath_kregbase) {
1535                 if (pd->port_rcvhdrtail_uaddr) {
1536                         pd->port_rcvhdrtail_uaddr = 0;
1537                         pd->port_rcvhdrtail_kvaddr = NULL;
1538                         ipath_release_user_pages_on_close(
1539                                 &pd->port_rcvhdrtail_pagep, 1);
1540                         pd->port_rcvhdrtail_pagep = NULL;
1541                         ipath_stats.sps_pageunlocks++;
1542                 }
1543                 ipath_write_kreg_port(
1544                         dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
1545                         port, 0ULL);
1546                 ipath_write_kreg_port(
1547                         dd, dd->ipath_kregs->kr_rcvhdraddr,
1548                         pd->port_port, 0);
1549
1550                 /* clean up the pkeys for this port user */
1551                 ipath_clean_part_key(pd, dd);
1552
1553                 if (port < dd->ipath_cfgports) {
1554                         int i = dd->ipath_pbufsport * (port - 1);
1555                         ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
1556
1557                         /* atomically clear receive enable port. */
1558                         clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
1559                                   &dd->ipath_rcvctrl);
1560                         ipath_write_kreg(
1561                                 dd,
1562                                 dd->ipath_kregs->kr_rcvctrl,
1563                                 dd->ipath_rcvctrl);
1564
1565                         if (dd->ipath_pageshadow)
1566                                 unlock_expected_tids(pd);
1567                         ipath_stats.sps_ports--;
1568                         ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
1569                                    pd->port_comm, pd->port_pid,
1570                                    dd->ipath_unit, port);
1571                 }
1572         }
1573
1574         pd->port_cnt = 0;
1575         pd->port_pid = 0;
1576
1577         dd->ipath_f_clear_tids(dd, pd->port_port);
1578
1579         ipath_free_pddata(dd, pd->port_port, 0);
1580
1581         mutex_unlock(&ipath_mutex);
1582
1583         return ret;
1584 }
1585
1586 static int ipath_port_info(struct ipath_portdata *pd,
1587                            struct ipath_port_info __user *uinfo)
1588 {
1589         struct ipath_port_info info;
1590         int nup;
1591         int ret;
1592
1593         (void) ipath_count_units(NULL, &nup, NULL);
1594         info.num_active = nup;
1595         info.unit = pd->port_dd->ipath_unit;
1596         info.port = pd->port_port;
1597
1598         if (copy_to_user(uinfo, &info, sizeof(info))) {
1599                 ret = -EFAULT;
1600                 goto bail;
1601         }
1602         ret = 0;
1603
1604 bail:
1605         return ret;
1606 }
1607
1608 static ssize_t ipath_write(struct file *fp, const char __user *data,
1609                            size_t count, loff_t *off)
1610 {
1611         const struct ipath_cmd __user *ucmd;
1612         struct ipath_portdata *pd;
1613         const void __user *src;
1614         size_t consumed, copy;
1615         struct ipath_cmd cmd;
1616         ssize_t ret = 0;
1617         void *dest;
1618
1619         if (count < sizeof(cmd.type)) {
1620                 ret = -EINVAL;
1621                 goto bail;
1622         }
1623
1624         ucmd = (const struct ipath_cmd __user *) data;
1625
1626         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1627                 ret = -EFAULT;
1628                 goto bail;
1629         }
1630
1631         consumed = sizeof(cmd.type);
1632
1633         switch (cmd.type) {
1634         case IPATH_CMD_USER_INIT:
1635                 copy = sizeof(cmd.cmd.user_info);
1636                 dest = &cmd.cmd.user_info;
1637                 src = &ucmd->cmd.user_info;
1638                 break;
1639         case IPATH_CMD_RECV_CTRL:
1640                 copy = sizeof(cmd.cmd.recv_ctrl);
1641                 dest = &cmd.cmd.recv_ctrl;
1642                 src = &ucmd->cmd.recv_ctrl;
1643                 break;
1644         case IPATH_CMD_PORT_INFO:
1645                 copy = sizeof(cmd.cmd.port_info);
1646                 dest = &cmd.cmd.port_info;
1647                 src = &ucmd->cmd.port_info;
1648                 break;
1649         case IPATH_CMD_TID_UPDATE:
1650         case IPATH_CMD_TID_FREE:
1651                 copy = sizeof(cmd.cmd.tid_info);
1652                 dest = &cmd.cmd.tid_info;
1653                 src = &ucmd->cmd.tid_info;
1654                 break;
1655         case IPATH_CMD_SET_PART_KEY:
1656                 copy = sizeof(cmd.cmd.part_key);
1657                 dest = &cmd.cmd.part_key;
1658                 src = &ucmd->cmd.part_key;
1659                 break;
1660         default:
1661                 ret = -EINVAL;
1662                 goto bail;
1663         }
1664
1665         if ((count - consumed) < copy) {
1666                 ret = -EINVAL;
1667                 goto bail;
1668         }
1669
1670         if (copy_from_user(dest, src, copy)) {
1671                 ret = -EFAULT;
1672                 goto bail;
1673         }
1674
1675         consumed += copy;
1676         pd = port_fp(fp);
1677
1678         switch (cmd.type) {
1679         case IPATH_CMD_USER_INIT:
1680                 ret = ipath_do_user_init(pd, &cmd.cmd.user_info);
1681                 if (ret < 0)
1682                         goto bail;
1683                 ret = ipath_get_base_info(
1684                         pd, (void __user *) (unsigned long)
1685                         cmd.cmd.user_info.spu_base_info,
1686                         cmd.cmd.user_info.spu_base_info_size);
1687                 break;
1688         case IPATH_CMD_RECV_CTRL:
1689                 ret = ipath_manage_rcvq(pd, cmd.cmd.recv_ctrl);
1690                 break;
1691         case IPATH_CMD_PORT_INFO:
1692                 ret = ipath_port_info(pd,
1693                                       (struct ipath_port_info __user *)
1694                                       (unsigned long) cmd.cmd.port_info);
1695                 break;
1696         case IPATH_CMD_TID_UPDATE:
1697                 ret = ipath_tid_update(pd, &cmd.cmd.tid_info);
1698                 break;
1699         case IPATH_CMD_TID_FREE:
1700                 ret = ipath_tid_free(pd, &cmd.cmd.tid_info);
1701                 break;
1702         case IPATH_CMD_SET_PART_KEY:
1703                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
1704                 break;
1705         }
1706
1707         if (ret >= 0)
1708                 ret = consumed;
1709
1710 bail:
1711         return ret;
1712 }
1713
1714 static struct class *ipath_class;
1715
1716 static int init_cdev(int minor, char *name, struct file_operations *fops,
1717                      struct cdev **cdevp, struct class_device **class_devp)
1718 {
1719         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
1720         struct cdev *cdev = NULL;
1721         struct class_device *class_dev = NULL;
1722         int ret;
1723
1724         cdev = cdev_alloc();
1725         if (!cdev) {
1726                 printk(KERN_ERR IPATH_DRV_NAME
1727                        ": Could not allocate cdev for minor %d, %s\n",
1728                        minor, name);
1729                 ret = -ENOMEM;
1730                 goto done;
1731         }
1732
1733         cdev->owner = THIS_MODULE;
1734         cdev->ops = fops;
1735         kobject_set_name(&cdev->kobj, name);
1736
1737         ret = cdev_add(cdev, dev, 1);
1738         if (ret < 0) {
1739                 printk(KERN_ERR IPATH_DRV_NAME
1740                        ": Could not add cdev for minor %d, %s (err %d)\n",
1741                        minor, name, -ret);
1742                 goto err_cdev;
1743         }
1744
1745         class_dev = class_device_create(ipath_class, NULL, dev, NULL, name);
1746
1747         if (IS_ERR(class_dev)) {
1748                 ret = PTR_ERR(class_dev);
1749                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1750                        "class_dev for minor %d, %s (err %d)\n",
1751                        minor, name, -ret);
1752                 goto err_cdev;
1753         }
1754
1755         goto done;
1756
1757 err_cdev:
1758         cdev_del(cdev);
1759         cdev = NULL;
1760
1761 done:
1762         if (ret >= 0) {
1763                 *cdevp = cdev;
1764                 *class_devp = class_dev;
1765         } else {
1766                 *cdevp = NULL;
1767                 *class_devp = NULL;
1768         }
1769
1770         return ret;
1771 }
1772
1773 int ipath_cdev_init(int minor, char *name, struct file_operations *fops,
1774                     struct cdev **cdevp, struct class_device **class_devp)
1775 {
1776         return init_cdev(minor, name, fops, cdevp, class_devp);
1777 }
1778
1779 static void cleanup_cdev(struct cdev **cdevp,
1780                          struct class_device **class_devp)
1781 {
1782         struct class_device *class_dev = *class_devp;
1783
1784         if (class_dev) {
1785                 class_device_unregister(class_dev);
1786                 *class_devp = NULL;
1787         }
1788
1789         if (*cdevp) {
1790                 cdev_del(*cdevp);
1791                 *cdevp = NULL;
1792         }
1793 }
1794
1795 void ipath_cdev_cleanup(struct cdev **cdevp,
1796                         struct class_device **class_devp)
1797 {
1798         cleanup_cdev(cdevp, class_devp);
1799 }
1800
1801 static struct cdev *wildcard_cdev;
1802 static struct class_device *wildcard_class_dev;
1803
1804 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
1805
1806 static int user_init(void)
1807 {
1808         int ret;
1809
1810         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
1811         if (ret < 0) {
1812                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
1813                        "chrdev region (err %d)\n", -ret);
1814                 goto done;
1815         }
1816
1817         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
1818
1819         if (IS_ERR(ipath_class)) {
1820                 ret = PTR_ERR(ipath_class);
1821                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1822                        "device class (err %d)\n", -ret);
1823                 goto bail;
1824         }
1825
1826         goto done;
1827 bail:
1828         unregister_chrdev_region(dev, IPATH_NMINORS);
1829 done:
1830         return ret;
1831 }
1832
1833 static void user_cleanup(void)
1834 {
1835         if (ipath_class) {
1836                 class_destroy(ipath_class);
1837                 ipath_class = NULL;
1838         }
1839
1840         unregister_chrdev_region(dev, IPATH_NMINORS);
1841 }
1842
1843 static atomic_t user_count = ATOMIC_INIT(0);
1844 static atomic_t user_setup = ATOMIC_INIT(0);
1845
1846 int ipath_user_add(struct ipath_devdata *dd)
1847 {
1848         char name[10];
1849         int ret;
1850
1851         if (atomic_inc_return(&user_count) == 1) {
1852                 ret = user_init();
1853                 if (ret < 0) {
1854                         ipath_dev_err(dd, "Unable to set up user support: "
1855                                       "error %d\n", -ret);
1856                         goto bail;
1857                 }
1858                 ret = ipath_diag_init();
1859                 if (ret < 0) {
1860                         ipath_dev_err(dd, "Unable to set up diag support: "
1861                                       "error %d\n", -ret);
1862                         goto bail_sma;
1863                 }
1864
1865                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
1866                                 &wildcard_class_dev);
1867                 if (ret < 0) {
1868                         ipath_dev_err(dd, "Could not create wildcard "
1869                                       "minor: error %d\n", -ret);
1870                         goto bail_diag;
1871                 }
1872
1873                 atomic_set(&user_setup, 1);
1874         }
1875
1876         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
1877
1878         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
1879                         &dd->cdev, &dd->class_dev);
1880         if (ret < 0)
1881                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
1882                               dd->ipath_unit + 1, name);
1883
1884         goto bail;
1885
1886 bail_diag:
1887         ipath_diag_cleanup();
1888 bail_sma:
1889         user_cleanup();
1890 bail:
1891         return ret;
1892 }
1893
1894 void ipath_user_del(struct ipath_devdata *dd)
1895 {
1896         cleanup_cdev(&dd->cdev, &dd->class_dev);
1897
1898         if (atomic_dec_return(&user_count) == 0) {
1899                 if (atomic_read(&user_setup) == 0)
1900                         goto bail;
1901
1902                 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
1903                 ipath_diag_cleanup();
1904                 user_cleanup();
1905
1906                 atomic_set(&user_setup, 0);
1907         }
1908 bail:
1909         return;
1910 }