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