drivers/infiniband/hw/ipath/ipath_file_ops.c

   1 /*
   2  * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/pci.h>
  35 #include <linux/poll.h>
  36 #include <linux/cdev.h>
  37 #include <linux/swap.h>
  38 #include <linux/vmalloc.h>
  39 #include <asm/pgtable.h>
  40
  41 #include "ipath_kernel.h"
  42 #include "ipath_common.h"
  43
  44 static int ipath_open(struct inode *, struct file *);
  45 static int ipath_close(struct inode *, struct file *);
  46 static ssize_t ipath_write(struct file *, const char __user *, size_t,
  47                            loff_t *);
  48 static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
  49 static int ipath_mmap(struct file *, struct vm_area_struct *);
  50
  51 static const 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 /*
  61  * Convert kernel virtual addresses to physical addresses so they don't
  62  * potentially conflict with the chip addresses used as mmap offsets.
  63  * It doesn't really matter what mmap offset we use as long as we can
  64  * interpret it correctly.
  65  */
  66 static u64 cvt_kvaddr(void *p)
  67 {
  68         struct page *page;
  69         u64 paddr = 0;
  70
  71         page = vmalloc_to_page(p);
  72         if (page)
  73                 paddr = page_to_pfn(page) << PAGE_SHIFT;
  74
  75         return paddr;
  76 }
  77
  78 static int ipath_get_base_info(struct file *fp,
  79                                void __user *ubase, size_t ubase_size)
  80 {
  81         struct ipath_portdata *pd = port_fp(fp);
  82         int ret = 0;
  83         struct ipath_base_info *kinfo = NULL;
  84         struct ipath_devdata *dd = pd->port_dd;
  85         unsigned subport_cnt;
  86         int shared, master;
  87         size_t sz;
  88
  89         subport_cnt = pd->port_subport_cnt;
  90         if (!subport_cnt) {
  91                 shared = 0;
  92                 master = 0;
  93                 subport_cnt = 1;
  94         } else {
  95                 shared = 1;
  96                 master = !subport_fp(fp);
  97         }
  98
  99         sz = sizeof(*kinfo);
 100         /* If port sharing is not requested, allow the old size structure */
 101         if (!shared)
 102                 sz -= 7 * sizeof(u64);
 103         if (ubase_size < sz) {
 104                 ipath_cdbg(PROC,
 105                            "Base size %zu, need %zu (version mismatch?)\n",
 106                            ubase_size, sz);
 107                 ret = -EINVAL;
 108                 goto bail;
 109         }
 110
 111         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
 112         if (kinfo == NULL) {
 113                 ret = -ENOMEM;
 114                 goto bail;
 115         }
 116
 117         ret = dd->ipath_f_get_base_info(pd, kinfo);
 118         if (ret < 0)
 119                 goto bail;
 120
 121         kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
 122         kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
 123         kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
 124         kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
 125         /*
 126          * have to mmap whole thing
 127          */
 128         kinfo->spi_rcv_egrbuftotlen =
 129                 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
 130         kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
 131         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
 132                 pd->port_rcvegrbuf_chunks;
 133         kinfo->spi_tidcnt = dd->ipath_rcvtidcnt / subport_cnt;
 134         if (master)
 135                 kinfo->spi_tidcnt += dd->ipath_rcvtidcnt % subport_cnt;
 136         /*
 137          * for this use, may be ipath_cfgports summed over all chips that
 138          * are are configured and present
 139          */
 140         kinfo->spi_nports = dd->ipath_cfgports;
 141         /* unit (chip/board) our port is on */
 142         kinfo->spi_unit = dd->ipath_unit;
 143         /* for now, only a single page */
 144         kinfo->spi_tid_maxsize = PAGE_SIZE;
 145
 146         /*
 147          * Doing this per port, and based on the skip value, etc.  This has
 148          * to be the actual buffer size, since the protocol code treats it
 149          * as an array.
 150          *
 151          * These have to be set to user addresses in the user code via mmap.
 152          * These values are used on return to user code for the mmap target
 153          * addresses only.  For 32 bit, same 44 bit address problem, so use
 154          * the physical address, not virtual.  Before 2.6.11, using the
 155          * page_address() macro worked, but in 2.6.11, even that returns the
 156          * full 64 bit address (upper bits all 1's).  So far, using the
 157          * physical addresses (or chip offsets, for chip mapping) works, but
 158          * no doubt some future kernel release will change that, and we'll be
 159          * on to yet another method of dealing with this.
 160          */
 161         kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
 162         kinfo->spi_rcvhdr_tailaddr = (u64) pd->port_rcvhdrqtailaddr_phys;
 163         kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
 164         kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
 165         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
 166                 (void *) dd->ipath_statusp -
 167                 (void *) dd->ipath_pioavailregs_dma;
 168         if (!shared) {
 169                 kinfo->spi_piocnt = dd->ipath_pbufsport;
 170                 kinfo->spi_piobufbase = (u64) pd->port_piobufs;
 171                 kinfo->__spi_uregbase = (u64) dd->ipath_uregbase +
 172                         dd->ipath_palign * pd->port_port;
 173         } else if (master) {
 174                 kinfo->spi_piocnt = (dd->ipath_pbufsport / subport_cnt) +
 175                                     (dd->ipath_pbufsport % subport_cnt);
 176                 /* Master's PIO buffers are after all the slave's */
 177                 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
 178                         dd->ipath_palign *
 179                         (dd->ipath_pbufsport - kinfo->spi_piocnt);
 180         } else {
 181                 unsigned slave = subport_fp(fp) - 1;
 182
 183                 kinfo->spi_piocnt = dd->ipath_pbufsport / subport_cnt;
 184                 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
 185                         dd->ipath_palign * kinfo->spi_piocnt * slave;
 186         }
 187         if (shared) {
 188                 kinfo->spi_port_uregbase = (u64) dd->ipath_uregbase +
 189                         dd->ipath_palign * pd->port_port;
 190                 kinfo->spi_port_rcvegrbuf = kinfo->spi_rcv_egrbufs;
 191                 kinfo->spi_port_rcvhdr_base = kinfo->spi_rcvhdr_base;
 192                 kinfo->spi_port_rcvhdr_tailaddr = kinfo->spi_rcvhdr_tailaddr;
 193
 194                 kinfo->__spi_uregbase = cvt_kvaddr(pd->subport_uregbase +
 195                         PAGE_SIZE * subport_fp(fp));
 196
 197                 kinfo->spi_rcvhdr_base = cvt_kvaddr(pd->subport_rcvhdr_base +
 198                         pd->port_rcvhdrq_size * subport_fp(fp));
 199                 kinfo->spi_rcvhdr_tailaddr = 0;
 200                 kinfo->spi_rcv_egrbufs = cvt_kvaddr(pd->subport_rcvegrbuf +
 201                         pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size *
 202                         subport_fp(fp));
 203
 204                 kinfo->spi_subport_uregbase =
 205                         cvt_kvaddr(pd->subport_uregbase);
 206                 kinfo->spi_subport_rcvegrbuf =
 207                         cvt_kvaddr(pd->subport_rcvegrbuf);
 208                 kinfo->spi_subport_rcvhdr_base =
 209                         cvt_kvaddr(pd->subport_rcvhdr_base);
 210                 ipath_cdbg(PROC, "port %u flags %x %llx %llx %llx\n",
 211                         kinfo->spi_port, kinfo->spi_runtime_flags,
 212                         (unsigned long long) kinfo->spi_subport_uregbase,
 213                         (unsigned long long) kinfo->spi_subport_rcvegrbuf,
 214                         (unsigned long long) kinfo->spi_subport_rcvhdr_base);
 215         }
 216
 217         kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->ipath_piobufbase) /
 218                 dd->ipath_palign;
 219         kinfo->spi_pioalign = dd->ipath_palign;
 220
 221         kinfo->spi_qpair = IPATH_KD_QP;
 222         kinfo->spi_piosize = dd->ipath_ibmaxlen;
 223         kinfo->spi_mtu = dd->ipath_ibmaxlen;    /* maxlen, not ibmtu */
 224         kinfo->spi_port = pd->port_port;
 225         kinfo->spi_subport = subport_fp(fp);
 226         kinfo->spi_sw_version = IPATH_KERN_SWVERSION;
 227         kinfo->spi_hw_version = dd->ipath_revision;
 228
 229         if (master) {
 230                 kinfo->spi_runtime_flags |= IPATH_RUNTIME_MASTER;
 231         }
 232
 233         sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
 234         if (copy_to_user(ubase, kinfo, sz))
 235                 ret = -EFAULT;
 236
 237 bail:
 238         kfree(kinfo);
 239         return ret;
 240 }
 241
 242 /**
 243  * ipath_tid_update - update a port TID
 244  * @pd: the port
 245  * @fp: the ipath device file
 246  * @ti: the TID information
 247  *
 248  * The new implementation as of Oct 2004 is that the driver assigns
 249  * the tid and returns it to the caller.   To make it easier to
 250  * catch bugs, and to reduce search time, we keep a cursor for
 251  * each port, walking the shadow tid array to find one that's not
 252  * in use.
 253  *
 254  * For now, if we can't allocate the full list, we fail, although
 255  * in the long run, we'll allocate as many as we can, and the
 256  * caller will deal with that by trying the remaining pages later.
 257  * That means that when we fail, we have to mark the tids as not in
 258  * use again, in our shadow copy.
 259  *
 260  * It's up to the caller to free the tids when they are done.
 261  * We'll unlock the pages as they free them.
 262  *
 263  * Also, right now we are locking one page at a time, but since
 264  * the intended use of this routine is for a single group of
 265  * virtually contiguous pages, that should change to improve
 266  * performance.
 267  */
 268 static int ipath_tid_update(struct ipath_portdata *pd, struct file *fp,
 269                             const struct ipath_tid_info *ti)
 270 {
 271         int ret = 0, ntids;
 272         u32 tid, porttid, cnt, i, tidcnt, tidoff;
 273         u16 *tidlist;
 274         struct ipath_devdata *dd = pd->port_dd;
 275         u64 physaddr;
 276         unsigned long vaddr;
 277         u64 __iomem *tidbase;
 278         unsigned long tidmap[8];
 279         struct page **pagep = NULL;
 280         unsigned subport = subport_fp(fp);
 281
 282         if (!dd->ipath_pageshadow) {
 283                 ret = -ENOMEM;
 284                 goto done;
 285         }
 286
 287         cnt = ti->tidcnt;
 288         if (!cnt) {
 289                 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
 290                           (unsigned long long) ti->tidlist);
 291                 /*
 292                  * Should we treat as success?  likely a bug
 293                  */
 294                 ret = -EFAULT;
 295                 goto done;
 296         }
 297         porttid = pd->port_port * dd->ipath_rcvtidcnt;
 298         if (!pd->port_subport_cnt) {
 299                 tidcnt = dd->ipath_rcvtidcnt;
 300                 tid = pd->port_tidcursor;
 301                 tidoff = 0;
 302         } else if (!subport) {
 303                 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
 304                          (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
 305                 tidoff = dd->ipath_rcvtidcnt - tidcnt;
 306                 porttid += tidoff;
 307                 tid = tidcursor_fp(fp);
 308         } else {
 309                 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
 310                 tidoff = tidcnt * (subport - 1);
 311                 porttid += tidoff;
 312                 tid = tidcursor_fp(fp);
 313         }
 314         if (cnt > tidcnt) {
 315                 /* make sure it all fits in port_tid_pg_list */
 316                 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
 317                          "TIDs, only trying max (%u)\n", cnt, tidcnt);
 318                 cnt = tidcnt;
 319         }
 320         pagep = &((struct page **) pd->port_tid_pg_list)[tidoff];
 321         tidlist = &((u16 *) &pagep[dd->ipath_rcvtidcnt])[tidoff];
 322
 323         memset(tidmap, 0, sizeof(tidmap));
 324         /* before decrement; chip actual # */
 325         ntids = tidcnt;
 326         tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
 327                                    dd->ipath_rcvtidbase +
 328                                    porttid * sizeof(*tidbase));
 329
 330         ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
 331                    pd->port_port, cnt, tid, tidbase);
 332
 333         /* virtual address of first page in transfer */
 334         vaddr = ti->tidvaddr;
 335         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
 336                        cnt * PAGE_SIZE)) {
 337                 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
 338                           (void *)vaddr, cnt);
 339                 ret = -EFAULT;
 340                 goto done;
 341         }
 342         ret = ipath_get_user_pages(vaddr, cnt, pagep);
 343         if (ret) {
 344                 if (ret == -EBUSY) {
 345                         ipath_dbg("Failed to lock addr %p, %u pages "
 346                                   "(already locked)\n",
 347                                   (void *) vaddr, cnt);
 348                         /*
 349                          * for now, continue, and see what happens but with
 350                          * the new implementation, this should never happen,
 351                          * unless perhaps the user has mpin'ed the pages
 352                          * themselves (something we need to test)
 353                          */
 354                         ret = 0;
 355                 } else {
 356                         dev_info(&dd->pcidev->dev,
 357                                  "Failed to lock addr %p, %u pages: "
 358                                  "errno %d\n", (void *) vaddr, cnt, -ret);
 359                         goto done;
 360                 }
 361         }
 362         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
 363                 for (; ntids--; tid++) {
 364                         if (tid == tidcnt)
 365                                 tid = 0;
 366                         if (!dd->ipath_pageshadow[porttid + tid])
 367                                 break;
 368                 }
 369                 if (ntids < 0) {
 370                         /*
 371                          * oops, wrapped all the way through their TIDs,
 372                          * and didn't have enough free; see comments at
 373                          * start of routine
 374                          */
 375                         ipath_dbg("Not enough free TIDs for %u pages "
 376                                   "(index %d), failing\n", cnt, i);
 377                         i--;    /* last tidlist[i] not filled in */
 378                         ret = -ENOMEM;
 379                         break;
 380                 }
 381                 tidlist[i] = tid + tidoff;
 382                 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
 383                            "vaddr %lx\n", i, tid + tidoff, vaddr);
 384                 /* we "know" system pages and TID pages are same size */
 385                 dd->ipath_pageshadow[porttid + tid] = pagep[i];
 386                 dd->ipath_physshadow[porttid + tid] = ipath_map_page(
 387                         dd->pcidev, pagep[i], 0, PAGE_SIZE,
 388                         PCI_DMA_FROMDEVICE);
 389                 /*
 390                  * don't need atomic or it's overhead
 391                  */
 392                 __set_bit(tid, tidmap);
 393                 physaddr = dd->ipath_physshadow[porttid + tid];
 394                 ipath_stats.sps_pagelocks++;
 395                 ipath_cdbg(VERBOSE,
 396                            "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
 397                            tid, vaddr, (unsigned long long) physaddr,
 398                            pagep[i]);
 399                 dd->ipath_f_put_tid(dd, &tidbase[tid], RCVHQ_RCV_TYPE_EXPECTED,
 400                                     physaddr);
 401                 /*
 402                  * don't check this tid in ipath_portshadow, since we
 403                  * just filled it in; start with the next one.
 404                  */
 405                 tid++;
 406         }
 407
 408         if (ret) {
 409                 u32 limit;
 410         cleanup:
 411                 /* jump here if copy out of updated info failed... */
 412                 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
 413                           -ret, i, cnt);
 414                 /* same code that's in ipath_free_tid() */
 415                 limit = sizeof(tidmap) * BITS_PER_BYTE;
 416                 if (limit > tidcnt)
 417                         /* just in case size changes in future */
 418                         limit = tidcnt;
 419                 tid = find_first_bit((const unsigned long *)tidmap, limit);
 420                 for (; tid < limit; tid++) {
 421                         if (!test_bit(tid, tidmap))
 422                                 continue;
 423                         if (dd->ipath_pageshadow[porttid + tid]) {
 424                                 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
 425                                            tid);
 426                                 dd->ipath_f_put_tid(dd, &tidbase[tid],
 427                                                     RCVHQ_RCV_TYPE_EXPECTED,
 428                                                     dd->ipath_tidinvalid);
 429                                 pci_unmap_page(dd->pcidev,
 430                                         dd->ipath_physshadow[porttid + tid],
 431                                         PAGE_SIZE, PCI_DMA_FROMDEVICE);
 432                                 dd->ipath_pageshadow[porttid + tid] = NULL;
 433                                 ipath_stats.sps_pageunlocks++;
 434                         }
 435                 }
 436                 ipath_release_user_pages(pagep, cnt);
 437         } else {
 438                 /*
 439                  * Copy the updated array, with ipath_tid's filled in, back
 440                  * to user.  Since we did the copy in already, this "should
 441                  * never fail" If it does, we have to clean up...
 442                  */
 443                 if (copy_to_user((void __user *)
 444                                  (unsigned long) ti->tidlist,
 445                                  tidlist, cnt * sizeof(*tidlist))) {
 446                         ret = -EFAULT;
 447                         goto cleanup;
 448                 }
 449                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
 450                                  tidmap, sizeof tidmap)) {
 451                         ret = -EFAULT;
 452                         goto cleanup;
 453                 }
 454                 if (tid == tidcnt)
 455                         tid = 0;
 456                 if (!pd->port_subport_cnt)
 457                         pd->port_tidcursor = tid;
 458                 else
 459                         tidcursor_fp(fp) = tid;
 460         }
 461
 462 done:
 463         if (ret)
 464                 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
 465                           ti->tidcnt, -ret);
 466         return ret;
 467 }
 468
 469 /**
 470  * ipath_tid_free - free a port TID
 471  * @pd: the port
 472  * @subport: the subport
 473  * @ti: the TID info
 474  *
 475  * right now we are unlocking one page at a time, but since
 476  * the intended use of this routine is for a single group of
 477  * virtually contiguous pages, that should change to improve
 478  * performance.  We check that the TID is in range for this port
 479  * but otherwise don't check validity; if user has an error and
 480  * frees the wrong tid, it's only their own data that can thereby
 481  * be corrupted.  We do check that the TID was in use, for sanity
 482  * We always use our idea of the saved address, not the address that
 483  * they pass in to us.
 484  */
 485
 486 static int ipath_tid_free(struct ipath_portdata *pd, unsigned subport,
 487                           const struct ipath_tid_info *ti)
 488 {
 489         int ret = 0;
 490         u32 tid, porttid, cnt, limit, tidcnt;
 491         struct ipath_devdata *dd = pd->port_dd;
 492         u64 __iomem *tidbase;
 493         unsigned long tidmap[8];
 494
 495         if (!dd->ipath_pageshadow) {
 496                 ret = -ENOMEM;
 497                 goto done;
 498         }
 499
 500         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
 501                            sizeof tidmap)) {
 502                 ret = -EFAULT;
 503                 goto done;
 504         }
 505
 506         porttid = pd->port_port * dd->ipath_rcvtidcnt;
 507         if (!pd->port_subport_cnt)
 508                 tidcnt = dd->ipath_rcvtidcnt;
 509         else if (!subport) {
 510                 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
 511                          (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
 512                 porttid += dd->ipath_rcvtidcnt - tidcnt;
 513         } else {
 514                 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
 515                 porttid += tidcnt * (subport - 1);
 516         }
 517         tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
 518                                    dd->ipath_rcvtidbase +
 519                                    porttid * sizeof(*tidbase));
 520
 521         limit = sizeof(tidmap) * BITS_PER_BYTE;
 522         if (limit > tidcnt)
 523                 /* just in case size changes in future */
 524                 limit = tidcnt;
 525         tid = find_first_bit(tidmap, limit);
 526         ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
 527                    "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
 528                    limit, tid, porttid);
 529         for (cnt = 0; tid < limit; tid++) {
 530                 /*
 531                  * small optimization; if we detect a run of 3 or so without
 532                  * any set, use find_first_bit again.  That's mainly to
 533                  * accelerate the case where we wrapped, so we have some at
 534                  * the beginning, and some at the end, and a big gap
 535                  * in the middle.
 536                  */
 537                 if (!test_bit(tid, tidmap))
 538                         continue;
 539                 cnt++;
 540                 if (dd->ipath_pageshadow[porttid + tid]) {
 541                         struct page *p;
 542                         p = dd->ipath_pageshadow[porttid + tid];
 543                         dd->ipath_pageshadow[porttid + tid] = NULL;
 544                         ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
 545                                    pd->port_pid, tid);
 546                         dd->ipath_f_put_tid(dd, &tidbase[tid],
 547                                             RCVHQ_RCV_TYPE_EXPECTED,
 548                                             dd->ipath_tidinvalid);
 549                         pci_unmap_page(dd->pcidev,
 550                                 dd->ipath_physshadow[porttid + tid],
 551                                 PAGE_SIZE, PCI_DMA_FROMDEVICE);
 552                         ipath_release_user_pages(&p, 1);
 553                         ipath_stats.sps_pageunlocks++;
 554                 } else
 555                         ipath_dbg("Unused tid %u, ignoring\n", tid);
 556         }
 557         if (cnt != ti->tidcnt)
 558                 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
 559                           ti->tidcnt, cnt);
 560 done:
 561         if (ret)
 562                 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
 563                           ti->tidcnt, -ret);
 564         return ret;
 565 }
 566
 567 /**
 568  * ipath_set_part_key - set a partition key
 569  * @pd: the port
 570  * @key: the key
 571  *
 572  * We can have up to 4 active at a time (other than the default, which is
 573  * always allowed).  This is somewhat tricky, since multiple ports may set
 574  * the same key, so we reference count them, and clean up at exit.  All 4
 575  * partition keys are packed into a single infinipath register.  It's an
 576  * error for a process to set the same pkey multiple times.  We provide no
 577  * mechanism to de-allocate a pkey at this time, we may eventually need to
 578  * do that.  I've used the atomic operations, and no locking, and only make
 579  * a single pass through what's available.  This should be more than
 580  * adequate for some time. I'll think about spinlocks or the like if and as
 581  * it's necessary.
 582  */
 583 static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
 584 {
 585         struct ipath_devdata *dd = pd->port_dd;
 586         int i, any = 0, pidx = -1;
 587         u16 lkey = key & 0x7FFF;
 588         int ret;
 589
 590         if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) {
 591                 /* nothing to do; this key always valid */
 592                 ret = 0;
 593                 goto bail;
 594         }
 595
 596         ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
 597                    "%hx:%x %hx:%x %hx:%x %hx:%x\n",
 598                    pd->port_port, key, dd->ipath_pkeys[0],
 599                    atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
 600                    atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
 601                    atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
 602                    atomic_read(&dd->ipath_pkeyrefs[3]));
 603
 604         if (!lkey) {
 605                 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
 606                            pd->port_port);
 607                 ret = -EINVAL;
 608                 goto bail;
 609         }
 610
 611         /*
 612          * Set the full membership bit, because it has to be
 613          * set in the register or the packet, and it seems
 614          * cleaner to set in the register than to force all
 615          * callers to set it. (see bug 4331)
 616          */
 617         key |= 0x8000;
 618
 619         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
 620                 if (!pd->port_pkeys[i] && pidx == -1)
 621                         pidx = i;
 622                 if (pd->port_pkeys[i] == key) {
 623                         ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
 624                                    "(%x) more than once\n",
 625                                    pd->port_port, key);
 626                         ret = -EEXIST;
 627                         goto bail;
 628                 }
 629         }
 630         if (pidx == -1) {
 631                 ipath_dbg("All pkeys for port %u already in use, "
 632                           "can't set %x\n", pd->port_port, key);
 633                 ret = -EBUSY;
 634                 goto bail;
 635         }
 636         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
 637                 if (!dd->ipath_pkeys[i]) {
 638                         any++;
 639                         continue;
 640                 }
 641                 if (dd->ipath_pkeys[i] == key) {
 642                         atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
 643
 644                         if (atomic_inc_return(pkrefs) > 1) {
 645                                 pd->port_pkeys[pidx] = key;
 646                                 ipath_cdbg(VERBOSE, "p%u set key %x "
 647                                            "matches #%d, count now %d\n",
 648                                            pd->port_port, key, i,
 649                                            atomic_read(pkrefs));
 650                                 ret = 0;
 651                                 goto bail;
 652                         } else {
 653                                 /*
 654                                  * lost race, decrement count, catch below
 655                                  */
 656                                 atomic_dec(pkrefs);
 657                                 ipath_cdbg(VERBOSE, "Lost race, count was "
 658                                            "0, after dec, it's %d\n",
 659                                            atomic_read(pkrefs));
 660                                 any++;
 661                         }
 662                 }
 663                 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
 664                         /*
 665                          * It makes no sense to have both the limited and
 666                          * full membership PKEY set at the same time since
 667                          * the unlimited one will disable the limited one.
 668                          */
 669                         ret = -EEXIST;
 670                         goto bail;
 671                 }
 672         }
 673         if (!any) {
 674                 ipath_dbg("port %u, all pkeys already in use, "
 675                           "can't set %x\n", pd->port_port, key);
 676                 ret = -EBUSY;
 677                 goto bail;
 678         }
 679         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
 680                 if (!dd->ipath_pkeys[i] &&
 681                     atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
 682                         u64 pkey;
 683
 684                         /* for ipathstats, etc. */
 685                         ipath_stats.sps_pkeys[i] = lkey;
 686                         pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
 687                         pkey =
 688                                 (u64) dd->ipath_pkeys[0] |
 689                                 ((u64) dd->ipath_pkeys[1] << 16) |
 690                                 ((u64) dd->ipath_pkeys[2] << 32) |
 691                                 ((u64) dd->ipath_pkeys[3] << 48);
 692                         ipath_cdbg(PROC, "p%u set key %x in #%d, "
 693                                    "portidx %d, new pkey reg %llx\n",
 694                                    pd->port_port, key, i, pidx,
 695                                    (unsigned long long) pkey);
 696                         ipath_write_kreg(
 697                                 dd, dd->ipath_kregs->kr_partitionkey, pkey);
 698
 699                         ret = 0;
 700                         goto bail;
 701                 }
 702         }
 703         ipath_dbg("port %u, all pkeys already in use 2nd pass, "
 704                   "can't set %x\n", pd->port_port, key);
 705         ret = -EBUSY;
 706
 707 bail:
 708         return ret;
 709 }
 710
 711 /**
 712  * ipath_manage_rcvq - manage a port's receive queue
 713  * @pd: the port
 714  * @subport: the subport
 715  * @start_stop: action to carry out
 716  *
 717  * start_stop == 0 disables receive on the port, for use in queue
 718  * overflow conditions.  start_stop==1 re-enables, to be used to
 719  * re-init the software copy of the head register
 720  */
 721 static int ipath_manage_rcvq(struct ipath_portdata *pd, unsigned subport,
 722                              int start_stop)
 723 {
 724         struct ipath_devdata *dd = pd->port_dd;
 725
 726         ipath_cdbg(PROC, "%sabling rcv for unit %u port %u:%u\n",
 727                    start_stop ? "en" : "dis", dd->ipath_unit,
 728                    pd->port_port, subport);
 729         if (subport)
 730                 goto bail;
 731         /* atomically clear receive enable port. */
 732         if (start_stop) {
 733                 /*
 734                  * On enable, force in-memory copy of the tail register to
 735                  * 0, so that protocol code doesn't have to worry about
 736                  * whether or not the chip has yet updated the in-memory
 737                  * copy or not on return from the system call. The chip
 738                  * always resets it's tail register back to 0 on a
 739                  * transition from disabled to enabled.  This could cause a
 740                  * problem if software was broken, and did the enable w/o
 741                  * the disable, but eventually the in-memory copy will be
 742                  * updated and correct itself, even in the face of software
 743                  * bugs.
 744                  */
 745                 *(volatile u64 *)pd->port_rcvhdrtail_kvaddr = 0;
 746                 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
 747                         &dd->ipath_rcvctrl);
 748         } else
 749                 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
 750                           &dd->ipath_rcvctrl);
 751         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 752                          dd->ipath_rcvctrl);
 753         /* now be sure chip saw it before we return */
 754         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 755         if (start_stop) {
 756                 /*
 757                  * And try to be sure that tail reg update has happened too.
 758                  * This should in theory interlock with the RXE changes to
 759                  * the tail register.  Don't assign it to the tail register
 760                  * in memory copy, since we could overwrite an update by the
 761                  * chip if we did.
 762                  */
 763                 ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
 764         }
 765         /* always; new head should be equal to new tail; see above */
 766 bail:
 767         return 0;
 768 }
 769
 770 static void ipath_clean_part_key(struct ipath_portdata *pd,
 771                                  struct ipath_devdata *dd)
 772 {
 773         int i, j, pchanged = 0;
 774         u64 oldpkey;
 775
 776         /* for debugging only */
 777         oldpkey = (u64) dd->ipath_pkeys[0] |
 778                 ((u64) dd->ipath_pkeys[1] << 16) |
 779                 ((u64) dd->ipath_pkeys[2] << 32) |
 780                 ((u64) dd->ipath_pkeys[3] << 48);
 781
 782         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
 783                 if (!pd->port_pkeys[i])
 784                         continue;
 785                 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
 786                            pd->port_pkeys[i]);
 787                 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
 788                         /* check for match independent of the global bit */
 789                         if ((dd->ipath_pkeys[j] & 0x7fff) !=
 790                             (pd->port_pkeys[i] & 0x7fff))
 791                                 continue;
 792                         if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
 793                                 ipath_cdbg(VERBOSE, "p%u clear key "
 794                                            "%x matches #%d\n",
 795                                            pd->port_port,
 796                                            pd->port_pkeys[i], j);
 797                                 ipath_stats.sps_pkeys[j] =
 798                                         dd->ipath_pkeys[j] = 0;
 799                                 pchanged++;
 800                         }
 801                         else ipath_cdbg(
 802                                 VERBOSE, "p%u key %x matches #%d, "
 803                                 "but ref still %d\n", pd->port_port,
 804                                 pd->port_pkeys[i], j,
 805                                 atomic_read(&dd->ipath_pkeyrefs[j]));
 806                         break;
 807                 }
 808                 pd->port_pkeys[i] = 0;
 809         }
 810         if (pchanged) {
 811                 u64 pkey = (u64) dd->ipath_pkeys[0] |
 812                         ((u64) dd->ipath_pkeys[1] << 16) |
 813                         ((u64) dd->ipath_pkeys[2] << 32) |
 814                         ((u64) dd->ipath_pkeys[3] << 48);
 815                 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
 816                            "new pkey reg %llx\n", pd->port_port,
 817                            (unsigned long long) oldpkey,
 818                            (unsigned long long) pkey);
 819                 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
 820                                  pkey);
 821         }
 822 }
 823
 824 /*
 825  * Initialize the port data with the receive buffer sizes
 826  * so this can be done while the master port is locked.
 827  * Otherwise, there is a race with a slave opening the port
 828  * and seeing these fields uninitialized.
 829  */
 830 static void init_user_egr_sizes(struct ipath_portdata *pd)
 831 {
 832         struct ipath_devdata *dd = pd->port_dd;
 833         unsigned egrperchunk, egrcnt, size;
 834
 835         /*
 836          * to avoid wasting a lot of memory, we allocate 32KB chunks of
 837          * physically contiguous memory, advance through it until used up
 838          * and then allocate more.  Of course, we need memory to store those
 839          * extra pointers, now.  Started out with 256KB, but under heavy
 840          * memory pressure (creating large files and then copying them over
 841          * NFS while doing lots of MPI jobs), we hit some allocation
 842          * failures, even though we can sleep...  (2.6.10) Still get
 843          * failures at 64K.  32K is the lowest we can go without wasting
 844          * additional memory.
 845          */
 846         size = 0x8000;
 847         egrperchunk = size / dd->ipath_rcvegrbufsize;
 848         egrcnt = dd->ipath_rcvegrcnt;
 849         pd->port_rcvegrbuf_chunks = (egrcnt + egrperchunk - 1) / egrperchunk;
 850         pd->port_rcvegrbufs_perchunk = egrperchunk;
 851         pd->port_rcvegrbuf_size = size;
 852 }
 853
 854 /**
 855  * ipath_create_user_egr - allocate eager TID buffers
 856  * @pd: the port to allocate TID buffers for
 857  *
 858  * This routine is now quite different for user and kernel, because
 859  * the kernel uses skb's, for the accelerated network performance
 860  * This is the user port version
 861  *
 862  * Allocate the eager TID buffers and program them into infinipath
 863  * They are no longer completely contiguous, we do multiple allocation
 864  * calls.
 865  */
 866 static int ipath_create_user_egr(struct ipath_portdata *pd)
 867 {
 868         struct ipath_devdata *dd = pd->port_dd;
 869         unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
 870         size_t size;
 871         int ret;
 872         gfp_t gfp_flags;
 873
 874         /*
 875          * GFP_USER, but without GFP_FS, so buffer cache can be
 876          * coalesced (we hope); otherwise, even at order 4,
 877          * heavy filesystem activity makes these fail, and we can
 878          * use compound pages.
 879          */
 880         gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
 881
 882         egrcnt = dd->ipath_rcvegrcnt;
 883         /* TID number offset for this port */
 884         egroff = pd->port_port * egrcnt;
 885         egrsize = dd->ipath_rcvegrbufsize;
 886         ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
 887                    "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
 888
 889         chunk = pd->port_rcvegrbuf_chunks;
 890         egrperchunk = pd->port_rcvegrbufs_perchunk;
 891         size = pd->port_rcvegrbuf_size;
 892         pd->port_rcvegrbuf = kmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]),
 893                                      GFP_KERNEL);
 894         if (!pd->port_rcvegrbuf) {
 895                 ret = -ENOMEM;
 896                 goto bail;
 897         }
 898         pd->port_rcvegrbuf_phys =
 899                 kmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]),
 900                         GFP_KERNEL);
 901         if (!pd->port_rcvegrbuf_phys) {
 902                 ret = -ENOMEM;
 903                 goto bail_rcvegrbuf;
 904         }
 905         for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
 906
 907                 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
 908                         &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
 909                         gfp_flags);
 910
 911                 if (!pd->port_rcvegrbuf[e]) {
 912                         ret = -ENOMEM;
 913                         goto bail_rcvegrbuf_phys;
 914                 }
 915         }
 916
 917         pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
 918
 919         for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
 920                 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
 921                 unsigned i;
 922
 923                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
 924                         dd->ipath_f_put_tid(dd, e + egroff +
 925                                             (u64 __iomem *)
 926                                             ((char __iomem *)
 927                                              dd->ipath_kregbase +
 928                                              dd->ipath_rcvegrbase),
 929                                             RCVHQ_RCV_TYPE_EAGER, pa);
 930                         pa += egrsize;
 931                 }
 932                 cond_resched(); /* don't hog the cpu */
 933         }
 934
 935         ret = 0;
 936         goto bail;
 937
 938 bail_rcvegrbuf_phys:
 939         for (e = 0; e < pd->port_rcvegrbuf_chunks &&
 940                 pd->port_rcvegrbuf[e]; e++) {
 941                 dma_free_coherent(&dd->pcidev->dev, size,
 942                                   pd->port_rcvegrbuf[e],
 943                                   pd->port_rcvegrbuf_phys[e]);
 944
 945         }
 946         kfree(pd->port_rcvegrbuf_phys);
 947         pd->port_rcvegrbuf_phys = NULL;
 948 bail_rcvegrbuf:
 949         kfree(pd->port_rcvegrbuf);
 950         pd->port_rcvegrbuf = NULL;
 951 bail:
 952         return ret;
 953 }
 954
 955
 956 /* common code for the mappings on dma_alloc_coherent mem */
 957 static int ipath_mmap_mem(struct vm_area_struct *vma,
 958         struct ipath_portdata *pd, unsigned len, int write_ok,
 959         void *kvaddr, char *what)
 960 {
 961         struct ipath_devdata *dd = pd->port_dd;
 962         unsigned long pfn;
 963         int ret;
 964
 965         if ((vma->vm_end - vma->vm_start) > len) {
 966                 dev_info(&dd->pcidev->dev,
 967                          "FAIL on %s: len %lx > %x\n", what,
 968                          vma->vm_end - vma->vm_start, len);
 969                 ret = -EFAULT;
 970                 goto bail;
 971         }
 972
 973         if (!write_ok) {
 974                 if (vma->vm_flags & VM_WRITE) {
 975                         dev_info(&dd->pcidev->dev,
 976                                  "%s must be mapped readonly\n", what);
 977                         ret = -EPERM;
 978                         goto bail;
 979                 }
 980
 981                 /* don't allow them to later change with mprotect */
 982                 vma->vm_flags &= ~VM_MAYWRITE;
 983         }
 984
 985         pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
 986         ret = remap_pfn_range(vma, vma->vm_start, pfn,
 987                               len, vma->vm_page_prot);
 988         if (ret)
 989                 dev_info(&dd->pcidev->dev, "%s port%u mmap of %lx, %x "
 990                          "bytes r%c failed: %d\n", what, pd->port_port,
 991                          pfn, len, write_ok?'w':'o', ret);
 992         else
 993                 ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes "
 994                            "r%c\n", what, pd->port_port, pfn, len,
 995                            write_ok?'w':'o');
 996 bail:
 997         return ret;
 998 }
 999
1000 static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
1001                      u64 ureg)
1002 {
1003         unsigned long phys;
1004         int ret;
1005
1006         /*
1007          * This is real hardware, so use io_remap.  This is the mechanism
1008          * for the user process to update the head registers for their port
1009          * in the chip.
1010          */
1011         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1012                 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
1013                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
1014                 ret = -EFAULT;
1015         } else {
1016                 phys = dd->ipath_physaddr + ureg;
1017                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1018
1019                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1020                 ret = io_remap_pfn_range(vma, vma->vm_start,
1021                                          phys >> PAGE_SHIFT,
1022                                          vma->vm_end - vma->vm_start,
1023                                          vma->vm_page_prot);
1024         }
1025         return ret;
1026 }
1027
1028 static int mmap_piobufs(struct vm_area_struct *vma,
1029                         struct ipath_devdata *dd,
1030                         struct ipath_portdata *pd,
1031                         unsigned piobufs, unsigned piocnt)
1032 {
1033         unsigned long phys;
1034         int ret;
1035
1036         /*
1037          * When we map the PIO buffers in the chip, we want to map them as
1038          * writeonly, no read possible.   This prevents access to previous
1039          * process data, and catches users who might try to read the i/o
1040          * space due to a bug.
1041          */
1042         if ((vma->vm_end - vma->vm_start) > (piocnt * dd->ipath_palign)) {
1043                 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
1044                          "reqlen %lx > PAGE\n",
1045                          vma->vm_end - vma->vm_start);
1046                 ret = -EINVAL;
1047                 goto bail;
1048         }
1049
1050         phys = dd->ipath_physaddr + piobufs;
1051
1052         /*
1053          * Don't mark this as non-cached, or we don't get the
1054          * write combining behavior we want on the PIO buffers!
1055          */
1056
1057 #if defined(__powerpc__)
1058         /* There isn't a generic way to specify writethrough mappings */
1059         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1060         pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
1061         pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
1062 #endif
1063
1064         /*
1065          * don't allow them to later change to readable with mprotect (for when
1066          * not initially mapped readable, as is normally the case)
1067          */
1068         vma->vm_flags &= ~VM_MAYREAD;
1069         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1070
1071         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1072                                  vma->vm_end - vma->vm_start,
1073                                  vma->vm_page_prot);
1074 bail:
1075         return ret;
1076 }
1077
1078 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1079                            struct ipath_portdata *pd)
1080 {
1081         struct ipath_devdata *dd = pd->port_dd;
1082         unsigned long start, size;
1083         size_t total_size, i;
1084         unsigned long pfn;
1085         int ret;
1086
1087         size = pd->port_rcvegrbuf_size;
1088         total_size = pd->port_rcvegrbuf_chunks * size;
1089         if ((vma->vm_end - vma->vm_start) > total_size) {
1090                 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1091                          "reqlen %lx > actual %lx\n",
1092                          vma->vm_end - vma->vm_start,
1093                          (unsigned long) total_size);
1094                 ret = -EINVAL;
1095                 goto bail;
1096         }
1097
1098         if (vma->vm_flags & VM_WRITE) {
1099                 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1100                          "writable (flags=%lx)\n", vma->vm_flags);
1101                 ret = -EPERM;
1102                 goto bail;
1103         }
1104         /* don't allow them to later change to writeable with mprotect */
1105         vma->vm_flags &= ~VM_MAYWRITE;
1106
1107         start = vma->vm_start;
1108
1109         for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1110                 pfn = virt_to_phys(pd->port_rcvegrbuf[i]) >> PAGE_SHIFT;
1111                 ret = remap_pfn_range(vma, start, pfn, size,
1112                                       vma->vm_page_prot);
1113                 if (ret < 0)
1114                         goto bail;
1115         }
1116         ret = 0;
1117
1118 bail:
1119         return ret;
1120 }
1121
1122 /*
1123  * ipath_file_vma_nopage - handle a VMA page fault.
1124  */
1125 static struct page *ipath_file_vma_nopage(struct vm_area_struct *vma,
1126                                           unsigned long address, int *type)
1127 {
1128         unsigned long offset = address - vma->vm_start;
1129         struct page *page = NOPAGE_SIGBUS;
1130         void *pageptr;
1131
1132         /*
1133          * Convert the vmalloc address into a struct page.
1134          */
1135         pageptr = (void *)(offset + (vma->vm_pgoff << PAGE_SHIFT));
1136         page = vmalloc_to_page(pageptr);
1137         if (!page)
1138                 goto out;
1139
1140         /* Increment the reference count. */
1141         get_page(page);
1142         if (type)
1143                 *type = VM_FAULT_MINOR;
1144 out:
1145         return page;
1146 }
1147
1148 static struct vm_operations_struct ipath_file_vm_ops = {
1149         .nopage = ipath_file_vma_nopage,
1150 };
1151
1152 static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
1153                        struct ipath_portdata *pd, unsigned subport)
1154 {
1155         unsigned long len;
1156         struct ipath_devdata *dd;
1157         void *addr;
1158         size_t size;
1159         int ret = 0;
1160
1161         /* If the port is not shared, all addresses should be physical */
1162         if (!pd->port_subport_cnt)
1163                 goto bail;
1164
1165         dd = pd->port_dd;
1166         size = pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
1167
1168         /*
1169          * Each process has all the subport uregbase, rcvhdrq, and
1170          * rcvegrbufs mmapped - as an array for all the processes,
1171          * and also separately for this process.
1172          */
1173         if (pgaddr == cvt_kvaddr(pd->subport_uregbase)) {
1174                 addr = pd->subport_uregbase;
1175                 size = PAGE_SIZE * pd->port_subport_cnt;
1176         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base)) {
1177                 addr = pd->subport_rcvhdr_base;
1178                 size = pd->port_rcvhdrq_size * pd->port_subport_cnt;
1179         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf)) {
1180                 addr = pd->subport_rcvegrbuf;
1181                 size *= pd->port_subport_cnt;
1182         } else if (pgaddr == cvt_kvaddr(pd->subport_uregbase +
1183                                         PAGE_SIZE * subport)) {
1184                 addr = pd->subport_uregbase + PAGE_SIZE * subport;
1185                 size = PAGE_SIZE;
1186         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base +
1187                                 pd->port_rcvhdrq_size * subport)) {
1188                 addr = pd->subport_rcvhdr_base +
1189                         pd->port_rcvhdrq_size * subport;
1190                 size = pd->port_rcvhdrq_size;
1191         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf +
1192                                size * subport)) {
1193                 addr = pd->subport_rcvegrbuf + size * subport;
1194                 /* rcvegrbufs are read-only on the slave */
1195                 if (vma->vm_flags & VM_WRITE) {
1196                         dev_info(&dd->pcidev->dev,
1197                                  "Can't map eager buffers as "
1198                                  "writable (flags=%lx)\n", vma->vm_flags);
1199                         ret = -EPERM;
1200                         goto bail;
1201                 }
1202                 /*
1203                  * Don't allow permission to later change to writeable
1204                  * with mprotect.
1205                  */
1206                 vma->vm_flags &= ~VM_MAYWRITE;
1207         } else {
1208                 goto bail;
1209         }
1210         len = vma->vm_end - vma->vm_start;
1211         if (len > size) {
1212                 ipath_cdbg(MM, "FAIL: reqlen %lx > %zx\n", len, size);
1213                 ret = -EINVAL;
1214                 goto bail;
1215         }
1216
1217         vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
1218         vma->vm_ops = &ipath_file_vm_ops;
1219         vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
1220         ret = 1;
1221
1222 bail:
1223         return ret;
1224 }
1225
1226 /**
1227  * ipath_mmap - mmap various structures into user space
1228  * @fp: the file pointer
1229  * @vma: the VM area
1230  *
1231  * We use this to have a shared buffer between the kernel and the user code
1232  * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1233  * buffers in the chip.  We have the open and close entries so we can bump
1234  * the ref count and keep the driver from being unloaded while still mapped.
1235  */
1236 static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1237 {
1238         struct ipath_portdata *pd;
1239         struct ipath_devdata *dd;
1240         u64 pgaddr, ureg;
1241         unsigned piobufs, piocnt;
1242         int ret;
1243
1244         pd = port_fp(fp);
1245         if (!pd) {
1246                 ret = -EINVAL;
1247                 goto bail;
1248         }
1249         dd = pd->port_dd;
1250
1251         /*
1252          * This is the ipath_do_user_init() code, mapping the shared buffers
1253          * into the user process. The address referred to by vm_pgoff is the
1254          * file offset passed via mmap().  For shared ports, this is the
1255          * kernel vmalloc() address of the pages to share with the master.
1256          * For non-shared or master ports, this is a physical address.
1257          * We only do one mmap for each space mapped.
1258          */
1259         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1260
1261         /*
1262          * Check for 0 in case one of the allocations failed, but user
1263          * called mmap anyway.
1264          */
1265         if (!pgaddr)  {
1266                 ret = -EINVAL;
1267                 goto bail;
1268         }
1269
1270         ipath_cdbg(MM, "pgaddr %llx vm_start=%lx len %lx port %u:%u:%u\n",
1271                    (unsigned long long) pgaddr, vma->vm_start,
1272                    vma->vm_end - vma->vm_start, dd->ipath_unit,
1273                    pd->port_port, subport_fp(fp));
1274
1275         /*
1276          * Physical addresses must fit in 40 bits for our hardware.
1277          * Check for kernel virtual addresses first, anything else must
1278          * match a HW or memory address.
1279          */
1280         ret = mmap_kvaddr(vma, pgaddr, pd, subport_fp(fp));
1281         if (ret) {
1282                 if (ret > 0)
1283                         ret = 0;
1284                 goto bail;
1285         }
1286
1287         ureg = dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
1288         if (!pd->port_subport_cnt) {
1289                 /* port is not shared */
1290                 piocnt = dd->ipath_pbufsport;
1291                 piobufs = pd->port_piobufs;
1292         } else if (!subport_fp(fp)) {
1293                 /* caller is the master */
1294                 piocnt = (dd->ipath_pbufsport / pd->port_subport_cnt) +
1295                          (dd->ipath_pbufsport % pd->port_subport_cnt);
1296                 piobufs = pd->port_piobufs +
1297                         dd->ipath_palign * (dd->ipath_pbufsport - piocnt);
1298         } else {
1299                 unsigned slave = subport_fp(fp) - 1;
1300
1301                 /* caller is a slave */
1302                 piocnt = dd->ipath_pbufsport / pd->port_subport_cnt;
1303                 piobufs = pd->port_piobufs + dd->ipath_palign * piocnt * slave;
1304         }
1305
1306         if (pgaddr == ureg)
1307                 ret = mmap_ureg(vma, dd, ureg);
1308         else if (pgaddr == piobufs)
1309                 ret = mmap_piobufs(vma, dd, pd, piobufs, piocnt);
1310         else if (pgaddr == dd->ipath_pioavailregs_phys)
1311                 /* in-memory copy of pioavail registers */
1312                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1313                                      (void *) dd->ipath_pioavailregs_dma,
1314                                      "pioavail registers");
1315         else if (pgaddr == pd->port_rcvegr_phys)
1316                 ret = mmap_rcvegrbufs(vma, pd);
1317         else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1318                 /*
1319                  * The rcvhdrq itself; readonly except on HT (so have
1320                  * to allow writable mapping), multiple pages, contiguous
1321                  * from an i/o perspective.
1322                  */
1323                 ret = ipath_mmap_mem(vma, pd, pd->port_rcvhdrq_size, 1,
1324                                      pd->port_rcvhdrq,
1325                                      "rcvhdrq");
1326         else if (pgaddr == (u64) pd->port_rcvhdrqtailaddr_phys)
1327                 /* in-memory copy of rcvhdrq tail register */
1328                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1329                                      pd->port_rcvhdrtail_kvaddr,
1330                                      "rcvhdrq tail");
1331         else
1332                 ret = -EINVAL;
1333
1334         vma->vm_private_data = NULL;
1335
1336         if (ret < 0)
1337                 dev_info(&dd->pcidev->dev,
1338                          "Failure %d on off %llx len %lx\n",
1339                          -ret, (unsigned long long)pgaddr,
1340                          vma->vm_end - vma->vm_start);
1341 bail:
1342         return ret;
1343 }
1344
1345 static unsigned ipath_poll_hdrqfull(struct ipath_portdata *pd)
1346 {
1347         unsigned pollflag = 0;
1348
1349         if ((pd->poll_type & IPATH_POLL_TYPE_OVERFLOW) &&
1350             pd->port_hdrqfull != pd->port_hdrqfull_poll) {
1351                 pollflag |= POLLIN | POLLRDNORM;
1352                 pd->port_hdrqfull_poll = pd->port_hdrqfull;
1353         }
1354
1355         return pollflag;
1356 }
1357
1358 static unsigned int ipath_poll_urgent(struct ipath_portdata *pd,
1359                                       struct file *fp,
1360                                       struct poll_table_struct *pt)
1361 {
1362         unsigned pollflag = 0;
1363         struct ipath_devdata *dd;
1364
1365         dd = pd->port_dd;
1366
1367         /* variable access in ipath_poll_hdrqfull() needs this */
1368         rmb();
1369         pollflag = ipath_poll_hdrqfull(pd);
1370
1371         if (pd->port_urgent != pd->port_urgent_poll) {
1372                 pollflag |= POLLIN | POLLRDNORM;
1373                 pd->port_urgent_poll = pd->port_urgent;
1374         }
1375
1376         if (!pollflag) {
1377                 /* this saves a spin_lock/unlock in interrupt handler... */
1378                 set_bit(IPATH_PORT_WAITING_URG, &pd->port_flag);
1379                 /* flush waiting flag so don't miss an event... */
1380                 wmb();
1381                 poll_wait(fp, &pd->port_wait, pt);
1382         }
1383
1384         return pollflag;
1385 }
1386
1387 static unsigned int ipath_poll_next(struct ipath_portdata *pd,
1388                                     struct file *fp,
1389                                     struct poll_table_struct *pt)
1390 {
1391         u32 head;
1392         u32 tail;
1393         unsigned pollflag = 0;
1394         struct ipath_devdata *dd;
1395
1396         dd = pd->port_dd;
1397
1398         /* variable access in ipath_poll_hdrqfull() needs this */
1399         rmb();
1400         pollflag = ipath_poll_hdrqfull(pd);
1401
1402         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1403         tail = *(volatile u64 *)pd->port_rcvhdrtail_kvaddr;
1404
1405         if (head != tail)
1406                 pollflag |= POLLIN | POLLRDNORM;
1407         else {
1408                 /* this saves a spin_lock/unlock in interrupt handler */
1409                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1410                 /* flush waiting flag so we don't miss an event */
1411                 wmb();
1412
1413                 set_bit(pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT,
1414                         &dd->ipath_rcvctrl);
1415
1416                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1417                                  dd->ipath_rcvctrl);
1418
1419                 if (dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1420                         ipath_write_ureg(dd, ur_rcvhdrhead,
1421                                          dd->ipath_rhdrhead_intr_off | head,
1422                                          pd->port_port);
1423
1424                 poll_wait(fp, &pd->port_wait, pt);
1425         }
1426
1427         return pollflag;
1428 }
1429
1430 static unsigned int ipath_poll(struct file *fp,
1431                                struct poll_table_struct *pt)
1432 {
1433         struct ipath_portdata *pd;
1434         unsigned pollflag;
1435
1436         pd = port_fp(fp);
1437         if (!pd)
1438                 pollflag = 0;
1439         else if (pd->poll_type & IPATH_POLL_TYPE_URGENT)
1440                 pollflag = ipath_poll_urgent(pd, fp, pt);
1441         else
1442                 pollflag = ipath_poll_next(pd, fp, pt);
1443
1444         return pollflag;
1445 }
1446
1447 static int ipath_supports_subports(int user_swmajor, int user_swminor)
1448 {
1449         /* no subport implementation prior to software version 1.3 */
1450         return (user_swmajor > 1) || (user_swminor >= 3);
1451 }
1452
1453 static int ipath_compatible_subports(int user_swmajor, int user_swminor)
1454 {
1455         /* this code is written long-hand for clarity */
1456         if (IPATH_USER_SWMAJOR != user_swmajor) {
1457                 /* no promise of compatibility if major mismatch */
1458                 return 0;
1459         }
1460         if (IPATH_USER_SWMAJOR == 1) {
1461                 switch (IPATH_USER_SWMINOR) {
1462                 case 0:
1463                 case 1:
1464                 case 2:
1465                         /* no subport implementation so cannot be compatible */
1466                         return 0;
1467                 case 3:
1468                         /* 3 is only compatible with itself */
1469                         return user_swminor == 3;
1470                 default:
1471                         /* >= 4 are compatible (or are expected to be) */
1472                         return user_swminor >= 4;
1473                 }
1474         }
1475         /* make no promises yet for future major versions */
1476         return 0;
1477 }
1478
1479 static int init_subports(struct ipath_devdata *dd,
1480                          struct ipath_portdata *pd,
1481                          const struct ipath_user_info *uinfo)
1482 {
1483         int ret = 0;
1484         unsigned num_subports;
1485         size_t size;
1486
1487         /*
1488          * If the user is requesting zero subports,
1489          * skip the subport allocation.
1490          */
1491         if (uinfo->spu_subport_cnt <= 0)
1492                 goto bail;
1493
1494         /* Self-consistency check for ipath_compatible_subports() */
1495         if (ipath_supports_subports(IPATH_USER_SWMAJOR, IPATH_USER_SWMINOR) &&
1496             !ipath_compatible_subports(IPATH_USER_SWMAJOR,
1497                                        IPATH_USER_SWMINOR)) {
1498                 dev_info(&dd->pcidev->dev,
1499                          "Inconsistent ipath_compatible_subports()\n");
1500                 goto bail;
1501         }
1502
1503         /* Check for subport compatibility */
1504         if (!ipath_compatible_subports(uinfo->spu_userversion >> 16,
1505                                        uinfo->spu_userversion & 0xffff)) {
1506                 dev_info(&dd->pcidev->dev,
1507                          "Mismatched user version (%d.%d) and driver "
1508                          "version (%d.%d) while port sharing. Ensure "
1509                          "that driver and library are from the same "
1510                          "release.\n",
1511                          (int) (uinfo->spu_userversion >> 16),
1512                          (int) (uinfo->spu_userversion & 0xffff),
1513                          IPATH_USER_SWMAJOR,
1514                          IPATH_USER_SWMINOR);
1515                 goto bail;
1516         }
1517         if (uinfo->spu_subport_cnt > INFINIPATH_MAX_SUBPORT) {
1518                 ret = -EINVAL;
1519                 goto bail;
1520         }
1521
1522         num_subports = uinfo->spu_subport_cnt;
1523         pd->subport_uregbase = vmalloc(PAGE_SIZE * num_subports);
1524         if (!pd->subport_uregbase) {
1525                 ret = -ENOMEM;
1526                 goto bail;
1527         }
1528         /* Note: pd->port_rcvhdrq_size isn't initialized yet. */
1529         size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1530                      sizeof(u32), PAGE_SIZE) * num_subports;
1531         pd->subport_rcvhdr_base = vmalloc(size);
1532         if (!pd->subport_rcvhdr_base) {
1533                 ret = -ENOMEM;
1534                 goto bail_ureg;
1535         }
1536
1537         pd->subport_rcvegrbuf = vmalloc(pd->port_rcvegrbuf_chunks *
1538                                         pd->port_rcvegrbuf_size *
1539                                         num_subports);
1540         if (!pd->subport_rcvegrbuf) {
1541                 ret = -ENOMEM;
1542                 goto bail_rhdr;
1543         }
1544
1545         pd->port_subport_cnt = uinfo->spu_subport_cnt;
1546         pd->port_subport_id = uinfo->spu_subport_id;
1547         pd->active_slaves = 1;
1548         set_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1549         memset(pd->subport_uregbase, 0, PAGE_SIZE * num_subports);
1550         memset(pd->subport_rcvhdr_base, 0, size);
1551         memset(pd->subport_rcvegrbuf, 0, pd->port_rcvegrbuf_chunks *
1552                                          pd->port_rcvegrbuf_size *
1553                                          num_subports);
1554         goto bail;
1555
1556 bail_rhdr:
1557         vfree(pd->subport_rcvhdr_base);
1558 bail_ureg:
1559         vfree(pd->subport_uregbase);
1560         pd->subport_uregbase = NULL;
1561 bail:
1562         return ret;
1563 }
1564
1565 static int try_alloc_port(struct ipath_devdata *dd, int port,
1566                           struct file *fp,
1567                           const struct ipath_user_info *uinfo)
1568 {
1569         struct ipath_portdata *pd;
1570         int ret;
1571
1572         if (!(pd = dd->ipath_pd[port])) {
1573                 void *ptmp;
1574
1575                 pd = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1576
1577                 /*
1578                  * Allocate memory for use in ipath_tid_update() just once
1579                  * at open, not per call.  Reduces cost of expected send
1580                  * setup.
1581                  */
1582                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1583                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1584                                GFP_KERNEL);
1585                 if (!pd || !ptmp) {
1586                         ipath_dev_err(dd, "Unable to allocate portdata "
1587                                       "memory, failing open\n");
1588                         ret = -ENOMEM;
1589                         kfree(pd);
1590                         kfree(ptmp);
1591                         goto bail;
1592                 }
1593                 dd->ipath_pd[port] = pd;
1594                 dd->ipath_pd[port]->port_port = port;
1595                 dd->ipath_pd[port]->port_dd = dd;
1596                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1597                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1598         }
1599         if (!pd->port_cnt) {
1600                 pd->userversion = uinfo->spu_userversion;
1601                 init_user_egr_sizes(pd);
1602                 if ((ret = init_subports(dd, pd, uinfo)) != 0)
1603                         goto bail;
1604                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1605                            current->comm, current->pid, dd->ipath_unit,
1606                            port);
1607                 pd->port_cnt = 1;
1608                 port_fp(fp) = pd;
1609                 pd->port_pid = current->pid;
1610                 strncpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
1611                 ipath_stats.sps_ports++;
1612                 ret = 0;
1613         } else
1614                 ret = -EBUSY;
1615
1616 bail:
1617         return ret;
1618 }
1619
1620 static inline int usable(struct ipath_devdata *dd)
1621 {
1622         return dd &&
1623                 (dd->ipath_flags & IPATH_PRESENT) &&
1624                 dd->ipath_kregbase &&
1625                 dd->ipath_lid &&
1626                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1627                                      | IPATH_LINKUNK));
1628 }
1629
1630 static int find_free_port(int unit, struct file *fp,
1631                           const struct ipath_user_info *uinfo)
1632 {
1633         struct ipath_devdata *dd = ipath_lookup(unit);
1634         int ret, i;
1635
1636         if (!dd) {
1637                 ret = -ENODEV;
1638                 goto bail;
1639         }
1640
1641         if (!usable(dd)) {
1642                 ret = -ENETDOWN;
1643                 goto bail;
1644         }
1645
1646         for (i = 1; i < dd->ipath_cfgports; i++) {
1647                 ret = try_alloc_port(dd, i, fp, uinfo);
1648                 if (ret != -EBUSY)
1649                         goto bail;
1650         }
1651         ret = -EBUSY;
1652
1653 bail:
1654         return ret;
1655 }
1656
1657 static int find_best_unit(struct file *fp,
1658                           const struct ipath_user_info *uinfo)
1659 {
1660         int ret = 0, i, prefunit = -1, devmax;
1661         int maxofallports, npresent, nup;
1662         int ndev;
1663
1664         devmax = ipath_count_units(&npresent, &nup, &maxofallports);
1665
1666         /*
1667          * This code is present to allow a knowledgeable person to
1668          * specify the layout of processes to processors before opening
1669          * this driver, and then we'll assign the process to the "closest"
1670          * InfiniPath chip to that processor (we assume reasonable connectivity,
1671          * for now).  This code assumes that if affinity has been set
1672          * before this point, that at most one cpu is set; for now this
1673          * is reasonable.  I check for both cpus_empty() and cpus_full(),
1674          * in case some kernel variant sets none of the bits when no
1675          * affinity is set.  2.6.11 and 12 kernels have all present
1676          * cpus set.  Some day we'll have to fix it up further to handle
1677          * a cpu subset.  This algorithm fails for two HT chips connected
1678          * in tunnel fashion.  Eventually this needs real topology
1679          * information.  There may be some issues with dual core numbering
1680          * as well.  This needs more work prior to release.
1681          */
1682         if (!cpus_empty(current->cpus_allowed) &&
1683             !cpus_full(current->cpus_allowed)) {
1684                 int ncpus = num_online_cpus(), curcpu = -1, nset = 0;
1685                 for (i = 0; i < ncpus; i++)
1686                         if (cpu_isset(i, current->cpus_allowed)) {
1687                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1688                                            "cpu %d/%d\n", current->comm,
1689                                            current->pid, i, ncpus);
1690                                 curcpu = i;
1691                                 nset++;
1692                         }
1693                 if (curcpu != -1 && nset != ncpus) {
1694                         if (npresent) {
1695                                 prefunit = curcpu / (ncpus / npresent);
1696                                 ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, "
1697                                           "%d cpus/chip, select unit %d\n",
1698                                           current->comm, current->pid,
1699                                           npresent, ncpus, ncpus / npresent,
1700                                           prefunit);
1701                         }
1702                 }
1703         }
1704
1705         /*
1706          * user ports start at 1, kernel port is 0
1707          * For now, we do round-robin access across all chips
1708          */
1709
1710         if (prefunit != -1)
1711                 devmax = prefunit + 1;
1712 recheck:
1713         for (i = 1; i < maxofallports; i++) {
1714                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1715                      ndev++) {
1716                         struct ipath_devdata *dd = ipath_lookup(ndev);
1717
1718                         if (!usable(dd))
1719                                 continue; /* can't use this unit */
1720                         if (i >= dd->ipath_cfgports)
1721                                 /*
1722                                  * Maxed out on users of this unit. Try
1723                                  * next.
1724                                  */
1725                                 continue;
1726                         ret = try_alloc_port(dd, i, fp, uinfo);
1727                         if (!ret)
1728                                 goto done;
1729                 }
1730         }
1731
1732         if (npresent) {
1733                 if (nup == 0) {
1734                         ret = -ENETDOWN;
1735                         ipath_dbg("No ports available (none initialized "
1736                                   "and ready)\n");
1737                 } else {
1738                         if (prefunit > 0) {
1739                                 /* if started above 0, retry from 0 */
1740                                 ipath_cdbg(PROC,
1741                                            "%s[%u] no ports on prefunit "
1742                                            "%d, clear and re-check\n",
1743                                            current->comm, current->pid,
1744                                            prefunit);
1745                                 devmax = ipath_count_units(NULL, NULL,
1746                                                            NULL);
1747                                 prefunit = -1;
1748                                 goto recheck;
1749                         }
1750                         ret = -EBUSY;
1751                         ipath_dbg("No ports available\n");
1752                 }
1753         } else {
1754                 ret = -ENXIO;
1755                 ipath_dbg("No boards found\n");
1756         }
1757
1758 done:
1759         return ret;
1760 }
1761
1762 static int find_shared_port(struct file *fp,
1763                             const struct ipath_user_info *uinfo)
1764 {
1765         int devmax, ndev, i;
1766         int ret = 0;
1767
1768         devmax = ipath_count_units(NULL, NULL, NULL);
1769
1770         for (ndev = 0; ndev < devmax; ndev++) {
1771                 struct ipath_devdata *dd = ipath_lookup(ndev);
1772
1773                 if (!dd)
1774                         continue;
1775                 for (i = 1; i < dd->ipath_cfgports; i++) {
1776                         struct ipath_portdata *pd = dd->ipath_pd[i];
1777
1778                         /* Skip ports which are not yet open */
1779                         if (!pd || !pd->port_cnt)
1780                                 continue;
1781                         /* Skip port if it doesn't match the requested one */
1782                         if (pd->port_subport_id != uinfo->spu_subport_id)
1783                                 continue;
1784                         /* Verify the sharing process matches the master */
1785                         if (pd->port_subport_cnt != uinfo->spu_subport_cnt ||
1786                             pd->userversion != uinfo->spu_userversion ||
1787                             pd->port_cnt >= pd->port_subport_cnt) {
1788                                 ret = -EINVAL;
1789                                 goto done;
1790                         }
1791                         port_fp(fp) = pd;
1792                         subport_fp(fp) = pd->port_cnt++;
1793                         tidcursor_fp(fp) = 0;
1794                         pd->active_slaves |= 1 << subport_fp(fp);
1795                         ipath_cdbg(PROC,
1796                                    "%s[%u] %u sharing %s[%u] unit:port %u:%u\n",
1797                                    current->comm, current->pid,
1798                                    subport_fp(fp),
1799                                    pd->port_comm, pd->port_pid,
1800                                    dd->ipath_unit, pd->port_port);
1801                         ret = 1;
1802                         goto done;
1803                 }
1804         }
1805
1806 done:
1807         return ret;
1808 }
1809
1810 static int ipath_open(struct inode *in, struct file *fp)
1811 {
1812         /* The real work is performed later in ipath_assign_port() */
1813         fp->private_data = kzalloc(sizeof(struct ipath_filedata), GFP_KERNEL);
1814         return fp->private_data ? 0 : -ENOMEM;
1815 }
1816
1817 /* Get port early, so can set affinity prior to memory allocation */
1818 static int ipath_assign_port(struct file *fp,
1819                               const struct ipath_user_info *uinfo)
1820 {
1821         int ret;
1822         int i_minor;
1823         unsigned swmajor, swminor;
1824
1825         /* Check to be sure we haven't already initialized this file */
1826         if (port_fp(fp)) {
1827                 ret = -EINVAL;
1828                 goto done;
1829         }
1830
1831         /* for now, if major version is different, bail */
1832         swmajor = uinfo->spu_userversion >> 16;
1833         if (swmajor != IPATH_USER_SWMAJOR) {
1834                 ipath_dbg("User major version %d not same as driver "
1835                           "major %d\n", uinfo->spu_userversion >> 16,
1836                           IPATH_USER_SWMAJOR);
1837                 ret = -ENODEV;
1838                 goto done;
1839         }
1840
1841         swminor = uinfo->spu_userversion & 0xffff;
1842         if (swminor != IPATH_USER_SWMINOR)
1843                 ipath_dbg("User minor version %d not same as driver "
1844                           "minor %d\n", swminor, IPATH_USER_SWMINOR);
1845
1846         mutex_lock(&ipath_mutex);
1847
1848         if (ipath_compatible_subports(swmajor, swminor) &&
1849             uinfo->spu_subport_cnt &&
1850             (ret = find_shared_port(fp, uinfo))) {
1851                 mutex_unlock(&ipath_mutex);
1852                 if (ret > 0)
1853                         ret = 0;
1854                 goto done;
1855         }
1856
1857         i_minor = iminor(fp->f_path.dentry->d_inode) - IPATH_USER_MINOR_BASE;
1858         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1859                    (long)fp->f_path.dentry->d_inode->i_rdev, i_minor);
1860
1861         if (i_minor)
1862                 ret = find_free_port(i_minor - 1, fp, uinfo);
1863         else
1864                 ret = find_best_unit(fp, uinfo);
1865
1866         mutex_unlock(&ipath_mutex);
1867
1868 done:
1869         return ret;
1870 }
1871
1872
1873 static int ipath_do_user_init(struct file *fp,
1874                               const struct ipath_user_info *uinfo)
1875 {
1876         int ret;
1877         struct ipath_portdata *pd = port_fp(fp);
1878         struct ipath_devdata *dd;
1879         u32 head32;
1880
1881         /* Subports don't need to initialize anything since master did it. */
1882         if (subport_fp(fp)) {
1883                 ret = wait_event_interruptible(pd->port_wait,
1884                         !test_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag));
1885                 goto done;
1886         }
1887
1888         dd = pd->port_dd;
1889
1890         if (uinfo->spu_rcvhdrsize) {
1891                 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
1892                 if (ret)
1893                         goto done;
1894         }
1895
1896         /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
1897
1898         /* for right now, kernel piobufs are at end, so port 1 is at 0 */
1899         pd->port_piobufs = dd->ipath_piobufbase +
1900                 dd->ipath_pbufsport * (pd->port_port - 1) * dd->ipath_palign;
1901         ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n",
1902                    pd->port_port, pd->port_piobufs);
1903
1904         /*
1905          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1906          * array for time being.  If pd->port_port > chip-supported,
1907          * we need to do extra stuff here to handle by handling overflow
1908          * through port 0, someday
1909          */
1910         ret = ipath_create_rcvhdrq(dd, pd);
1911         if (!ret)
1912                 ret = ipath_create_user_egr(pd);
1913         if (ret)
1914                 goto done;
1915
1916         /*
1917          * set the eager head register for this port to the current values
1918          * of the tail pointers, since we don't know if they were
1919          * updated on last use of the port.
1920          */
1921         head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
1922         ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
1923         dd->ipath_lastegrheads[pd->port_port] = -1;
1924         dd->ipath_lastrcvhdrqtails[pd->port_port] = -1;
1925         ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n",
1926                 pd->port_port, head32);
1927         pd->port_tidcursor = 0; /* start at beginning after open */
1928
1929         /* initialize poll variables... */
1930         pd->port_urgent = 0;
1931         pd->port_urgent_poll = 0;
1932         pd->port_hdrqfull_poll = pd->port_hdrqfull;
1933
1934         /*
1935          * now enable the port; the tail registers will be written to memory
1936          * by the chip as soon as it sees the write to
1937          * dd->ipath_kregs->kr_rcvctrl.  The update only happens on
1938          * transition from 0 to 1, so clear it first, then set it as part of
1939          * enabling the port.  This will (very briefly) affect any other
1940          * open ports, but it shouldn't be long enough to be an issue.
1941          * We explictly set the in-memory copy to 0 beforehand, so we don't
1942          * have to wait to be sure the DMA update has happened.
1943          */
1944         *(volatile u64 *)pd->port_rcvhdrtail_kvaddr = 0ULL;
1945         set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
1946                 &dd->ipath_rcvctrl);
1947         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1948                          dd->ipath_rcvctrl & ~INFINIPATH_R_TAILUPD);
1949         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1950                          dd->ipath_rcvctrl);
1951         /* Notify any waiting slaves */
1952         if (pd->port_subport_cnt) {
1953                 clear_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1954                 wake_up(&pd->port_wait);
1955         }
1956 done:
1957         return ret;
1958 }
1959
1960 /**
1961  * unlock_exptid - unlock any expected TID entries port still had in use
1962  * @pd: port
1963  *
1964  * We don't actually update the chip here, because we do a bulk update
1965  * below, using ipath_f_clear_tids.
1966  */
1967 static void unlock_expected_tids(struct ipath_portdata *pd)
1968 {
1969         struct ipath_devdata *dd = pd->port_dd;
1970         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
1971         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
1972
1973         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
1974                    pd->port_port);
1975         for (i = port_tidbase; i < maxtid; i++) {
1976                 if (!dd->ipath_pageshadow[i])
1977                         continue;
1978
1979                 pci_unmap_page(dd->pcidev, dd->ipath_physshadow[i],
1980                         PAGE_SIZE, PCI_DMA_FROMDEVICE);
1981                 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i],
1982                                                   1);
1983                 dd->ipath_pageshadow[i] = NULL;
1984                 cnt++;
1985                 ipath_stats.sps_pageunlocks++;
1986         }
1987         if (cnt)
1988                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
1989                            pd->port_port, cnt);
1990
1991         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
1992                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
1993                            (unsigned long long) ipath_stats.sps_pagelocks,
1994                            (unsigned long long)
1995                            ipath_stats.sps_pageunlocks);
1996 }
1997
1998 static int ipath_close(struct inode *in, struct file *fp)
1999 {
2000         int ret = 0;
2001         struct ipath_filedata *fd;
2002         struct ipath_portdata *pd;
2003         struct ipath_devdata *dd;
2004         unsigned port;
2005
2006         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
2007                    (long)in->i_rdev, fp->private_data);
2008
2009         mutex_lock(&ipath_mutex);
2010
2011         fd = (struct ipath_filedata *) fp->private_data;
2012         fp->private_data = NULL;
2013         pd = fd->pd;
2014         if (!pd) {
2015                 mutex_unlock(&ipath_mutex);
2016                 goto bail;
2017         }
2018         if (--pd->port_cnt) {
2019                 /*
2020                  * XXX If the master closes the port before the slave(s),
2021                  * revoke the mmap for the eager receive queue so
2022                  * the slave(s) don't wait for receive data forever.
2023                  */
2024                 pd->active_slaves &= ~(1 << fd->subport);
2025                 mutex_unlock(&ipath_mutex);
2026                 goto bail;
2027         }
2028         port = pd->port_port;
2029         dd = pd->port_dd;
2030
2031         if (pd->port_hdrqfull) {
2032                 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
2033                            "during run\n", pd->port_comm, pd->port_pid,
2034                            pd->port_hdrqfull);
2035                 pd->port_hdrqfull = 0;
2036         }
2037
2038         if (pd->port_rcvwait_to || pd->port_piowait_to
2039             || pd->port_rcvnowait || pd->port_pionowait) {
2040                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
2041                            "%u rcv %u, pio already\n",
2042                            pd->port_port, pd->port_rcvwait_to,
2043                            pd->port_piowait_to, pd->port_rcvnowait,
2044                            pd->port_pionowait);
2045                 pd->port_rcvwait_to = pd->port_piowait_to =
2046                         pd->port_rcvnowait = pd->port_pionowait = 0;
2047         }
2048         if (pd->port_flag) {
2049                 ipath_dbg("port %u port_flag still set to 0x%lx\n",
2050                           pd->port_port, pd->port_flag);
2051                 pd->port_flag = 0;
2052         }
2053
2054         if (dd->ipath_kregbase) {
2055                 int i;
2056                 /* atomically clear receive enable port and intr avail. */
2057                 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
2058                           &dd->ipath_rcvctrl);
2059                 clear_bit(pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT,
2060                           &dd->ipath_rcvctrl);
2061                 ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
2062                         dd->ipath_rcvctrl);
2063                 /* and read back from chip to be sure that nothing
2064                  * else is in flight when we do the rest */
2065                 (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
2066
2067                 /* clean up the pkeys for this port user */
2068                 ipath_clean_part_key(pd, dd);
2069                 /*
2070                  * be paranoid, and never write 0's to these, just use an
2071                  * unused part of the port 0 tail page.  Of course,
2072                  * rcvhdraddr points to a large chunk of memory, so this
2073                  * could still trash things, but at least it won't trash
2074                  * page 0, and by disabling the port, it should stop "soon",
2075                  * even if a packet or two is in already in flight after we
2076                  * disabled the port.
2077                  */
2078                 ipath_write_kreg_port(dd,
2079                         dd->ipath_kregs->kr_rcvhdrtailaddr, port,
2080                         dd->ipath_dummy_hdrq_phys);
2081                 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
2082                         pd->port_port, dd->ipath_dummy_hdrq_phys);
2083
2084                 i = dd->ipath_pbufsport * (port - 1);
2085                 ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
2086
2087                 dd->ipath_f_clear_tids(dd, pd->port_port);
2088
2089                 if (dd->ipath_pageshadow)
2090                         unlock_expected_tids(pd);
2091                 ipath_stats.sps_ports--;
2092                 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
2093                            pd->port_comm, pd->port_pid,
2094                            dd->ipath_unit, port);
2095         }
2096
2097         pd->port_pid = 0;
2098         dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */
2099         mutex_unlock(&ipath_mutex);
2100         ipath_free_pddata(dd, pd); /* after releasing the mutex */
2101
2102 bail:
2103         kfree(fd);
2104         return ret;
2105 }
2106
2107 static int ipath_port_info(struct ipath_portdata *pd, u16 subport,
2108                            struct ipath_port_info __user *uinfo)
2109 {
2110         struct ipath_port_info info;
2111         int nup;
2112         int ret;
2113         size_t sz;
2114
2115         (void) ipath_count_units(NULL, &nup, NULL);
2116         info.num_active = nup;
2117         info.unit = pd->port_dd->ipath_unit;
2118         info.port = pd->port_port;
2119         info.subport = subport;
2120         /* Don't return new fields if old library opened the port. */
2121         if (ipath_supports_subports(pd->userversion >> 16,
2122                                     pd->userversion & 0xffff)) {
2123                 /* Number of user ports available for this device. */
2124                 info.num_ports = pd->port_dd->ipath_cfgports - 1;
2125                 info.num_subports = pd->port_subport_cnt;
2126                 sz = sizeof(info);
2127         } else
2128                 sz = sizeof(info) - 2 * sizeof(u16);
2129
2130         if (copy_to_user(uinfo, &info, sz)) {
2131                 ret = -EFAULT;
2132                 goto bail;
2133         }
2134         ret = 0;
2135
2136 bail:
2137         return ret;
2138 }
2139
2140 static int ipath_get_slave_info(struct ipath_portdata *pd,
2141                                 void __user *slave_mask_addr)
2142 {
2143         int ret = 0;
2144
2145         if (copy_to_user(slave_mask_addr, &pd->active_slaves, sizeof(u32)))
2146                 ret = -EFAULT;
2147         return ret;
2148 }
2149
2150 static int ipath_force_pio_avail_update(struct ipath_devdata *dd)
2151 {
2152         u64 reg = dd->ipath_sendctrl;
2153
2154         clear_bit(IPATH_S_PIOBUFAVAILUPD, &reg);
2155         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, reg);
2156         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
2157
2158         return 0;
2159 }
2160
2161 static ssize_t ipath_write(struct file *fp, const char __user *data,
2162                            size_t count, loff_t *off)
2163 {
2164         const struct ipath_cmd __user *ucmd;
2165         struct ipath_portdata *pd;
2166         const void __user *src;
2167         size_t consumed, copy;
2168         struct ipath_cmd cmd;
2169         ssize_t ret = 0;
2170         void *dest;
2171
2172         if (count < sizeof(cmd.type)) {
2173                 ret = -EINVAL;
2174                 goto bail;
2175         }
2176
2177         ucmd = (const struct ipath_cmd __user *) data;
2178
2179         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
2180                 ret = -EFAULT;
2181                 goto bail;
2182         }
2183
2184         consumed = sizeof(cmd.type);
2185
2186         switch (cmd.type) {
2187         case IPATH_CMD_ASSIGN_PORT:
2188         case __IPATH_CMD_USER_INIT:
2189         case IPATH_CMD_USER_INIT:
2190                 copy = sizeof(cmd.cmd.user_info);
2191                 dest = &cmd.cmd.user_info;
2192                 src = &ucmd->cmd.user_info;
2193                 break;
2194         case IPATH_CMD_RECV_CTRL:
2195                 copy = sizeof(cmd.cmd.recv_ctrl);
2196                 dest = &cmd.cmd.recv_ctrl;
2197                 src = &ucmd->cmd.recv_ctrl;
2198                 break;
2199         case IPATH_CMD_PORT_INFO:
2200                 copy = sizeof(cmd.cmd.port_info);
2201                 dest = &cmd.cmd.port_info;
2202                 src = &ucmd->cmd.port_info;
2203                 break;
2204         case IPATH_CMD_TID_UPDATE:
2205         case IPATH_CMD_TID_FREE:
2206                 copy = sizeof(cmd.cmd.tid_info);
2207                 dest = &cmd.cmd.tid_info;
2208                 src = &ucmd->cmd.tid_info;
2209                 break;
2210         case IPATH_CMD_SET_PART_KEY:
2211                 copy = sizeof(cmd.cmd.part_key);
2212                 dest = &cmd.cmd.part_key;
2213                 src = &ucmd->cmd.part_key;
2214                 break;
2215         case __IPATH_CMD_SLAVE_INFO:
2216                 copy = sizeof(cmd.cmd.slave_mask_addr);
2217                 dest = &cmd.cmd.slave_mask_addr;
2218                 src = &ucmd->cmd.slave_mask_addr;
2219                 break;
2220         case IPATH_CMD_PIOAVAILUPD:     // force an update of PIOAvail reg
2221                 copy = 0;
2222                 src = NULL;
2223                 dest = NULL;
2224                 break;
2225         case IPATH_CMD_POLL_TYPE:
2226                 copy = sizeof(cmd.cmd.poll_type);
2227                 dest = &cmd.cmd.poll_type;
2228                 src = &ucmd->cmd.poll_type;
2229                 break;
2230         default:
2231                 ret = -EINVAL;
2232                 goto bail;
2233         }
2234
2235         if (copy) {
2236                 if ((count - consumed) < copy) {
2237                         ret = -EINVAL;
2238                         goto bail;
2239                 }
2240
2241                 if (copy_from_user(dest, src, copy)) {
2242                         ret = -EFAULT;
2243                         goto bail;
2244                 }
2245
2246                 consumed += copy;
2247         }
2248
2249         pd = port_fp(fp);
2250         if (!pd && cmd.type != __IPATH_CMD_USER_INIT &&
2251                 cmd.type != IPATH_CMD_ASSIGN_PORT) {
2252                 ret = -EINVAL;
2253                 goto bail;
2254         }
2255
2256         switch (cmd.type) {
2257         case IPATH_CMD_ASSIGN_PORT:
2258                 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2259                 if (ret)
2260                         goto bail;
2261                 break;
2262         case __IPATH_CMD_USER_INIT:
2263                 /* backwards compatibility, get port first */
2264                 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2265                 if (ret)
2266                         goto bail;
2267                 /* and fall through to current version. */
2268         case IPATH_CMD_USER_INIT:
2269                 ret = ipath_do_user_init(fp, &cmd.cmd.user_info);
2270                 if (ret)
2271                         goto bail;
2272                 ret = ipath_get_base_info(
2273                         fp, (void __user *) (unsigned long)
2274                         cmd.cmd.user_info.spu_base_info,
2275                         cmd.cmd.user_info.spu_base_info_size);
2276                 break;
2277         case IPATH_CMD_RECV_CTRL:
2278                 ret = ipath_manage_rcvq(pd, subport_fp(fp), cmd.cmd.recv_ctrl);
2279                 break;
2280         case IPATH_CMD_PORT_INFO:
2281                 ret = ipath_port_info(pd, subport_fp(fp),
2282                                       (struct ipath_port_info __user *)
2283                                       (unsigned long) cmd.cmd.port_info);
2284                 break;
2285         case IPATH_CMD_TID_UPDATE:
2286                 ret = ipath_tid_update(pd, fp, &cmd.cmd.tid_info);
2287                 break;
2288         case IPATH_CMD_TID_FREE:
2289                 ret = ipath_tid_free(pd, subport_fp(fp), &cmd.cmd.tid_info);
2290                 break;
2291         case IPATH_CMD_SET_PART_KEY:
2292                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
2293                 break;
2294         case __IPATH_CMD_SLAVE_INFO:
2295                 ret = ipath_get_slave_info(pd,
2296                                            (void __user *) (unsigned long)
2297                                            cmd.cmd.slave_mask_addr);
2298                 break;
2299         case IPATH_CMD_PIOAVAILUPD:
2300                 ret = ipath_force_pio_avail_update(pd->port_dd);
2301                 break;
2302         case IPATH_CMD_POLL_TYPE:
2303                 pd->poll_type = cmd.cmd.poll_type;
2304                 break;
2305         }
2306
2307         if (ret >= 0)
2308                 ret = consumed;
2309
2310 bail:
2311         return ret;
2312 }
2313
2314 static struct class *ipath_class;
2315
2316 static int init_cdev(int minor, char *name, const struct file_operations *fops,
2317                      struct cdev **cdevp, struct class_device **class_devp)
2318 {
2319         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
2320         struct cdev *cdev = NULL;
2321         struct class_device *class_dev = NULL;
2322         int ret;
2323
2324         cdev = cdev_alloc();
2325         if (!cdev) {
2326                 printk(KERN_ERR IPATH_DRV_NAME
2327                        ": Could not allocate cdev for minor %d, %s\n",
2328                        minor, name);
2329                 ret = -ENOMEM;
2330                 goto done;
2331         }
2332
2333         cdev->owner = THIS_MODULE;
2334         cdev->ops = fops;
2335         kobject_set_name(&cdev->kobj, name);
2336
2337         ret = cdev_add(cdev, dev, 1);
2338         if (ret < 0) {
2339                 printk(KERN_ERR IPATH_DRV_NAME
2340                        ": Could not add cdev for minor %d, %s (err %d)\n",
2341                        minor, name, -ret);
2342                 goto err_cdev;
2343         }
2344
2345         class_dev = class_device_create(ipath_class, NULL, dev, NULL, name);
2346
2347         if (IS_ERR(class_dev)) {
2348                 ret = PTR_ERR(class_dev);
2349                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2350                        "class_dev for minor %d, %s (err %d)\n",
2351                        minor, name, -ret);
2352                 goto err_cdev;
2353         }
2354
2355         goto done;
2356
2357 err_cdev:
2358         cdev_del(cdev);
2359         cdev = NULL;
2360
2361 done:
2362         if (ret >= 0) {
2363                 *cdevp = cdev;
2364                 *class_devp = class_dev;
2365         } else {
2366                 *cdevp = NULL;
2367                 *class_devp = NULL;
2368         }
2369
2370         return ret;
2371 }
2372
2373 int ipath_cdev_init(int minor, char *name, const struct file_operations *fops,
2374                     struct cdev **cdevp, struct class_device **class_devp)
2375 {
2376         return init_cdev(minor, name, fops, cdevp, class_devp);
2377 }
2378
2379 static void cleanup_cdev(struct cdev **cdevp,
2380                          struct class_device **class_devp)
2381 {
2382         struct class_device *class_dev = *class_devp;
2383
2384         if (class_dev) {
2385                 class_device_unregister(class_dev);
2386                 *class_devp = NULL;
2387         }
2388
2389         if (*cdevp) {
2390                 cdev_del(*cdevp);
2391                 *cdevp = NULL;
2392         }
2393 }
2394
2395 void ipath_cdev_cleanup(struct cdev **cdevp,
2396                         struct class_device **class_devp)
2397 {
2398         cleanup_cdev(cdevp, class_devp);
2399 }
2400
2401 static struct cdev *wildcard_cdev;
2402 static struct class_device *wildcard_class_dev;
2403
2404 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
2405
2406 static int user_init(void)
2407 {
2408         int ret;
2409
2410         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
2411         if (ret < 0) {
2412                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
2413                        "chrdev region (err %d)\n", -ret);
2414                 goto done;
2415         }
2416
2417         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
2418
2419         if (IS_ERR(ipath_class)) {
2420                 ret = PTR_ERR(ipath_class);
2421                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2422                        "device class (err %d)\n", -ret);
2423                 goto bail;
2424         }
2425
2426         goto done;
2427 bail:
2428         unregister_chrdev_region(dev, IPATH_NMINORS);
2429 done:
2430         return ret;
2431 }
2432
2433 static void user_cleanup(void)
2434 {
2435         if (ipath_class) {
2436                 class_destroy(ipath_class);
2437                 ipath_class = NULL;
2438         }
2439
2440         unregister_chrdev_region(dev, IPATH_NMINORS);
2441 }
2442
2443 static atomic_t user_count = ATOMIC_INIT(0);
2444 static atomic_t user_setup = ATOMIC_INIT(0);
2445
2446 int ipath_user_add(struct ipath_devdata *dd)
2447 {
2448         char name[10];
2449         int ret;
2450
2451         if (atomic_inc_return(&user_count) == 1) {
2452                 ret = user_init();
2453                 if (ret < 0) {
2454                         ipath_dev_err(dd, "Unable to set up user support: "
2455                                       "error %d\n", -ret);
2456                         goto bail;
2457                 }
2458                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
2459                                 &wildcard_class_dev);
2460                 if (ret < 0) {
2461                         ipath_dev_err(dd, "Could not create wildcard "
2462                                       "minor: error %d\n", -ret);
2463                         goto bail_user;
2464                 }
2465
2466                 atomic_set(&user_setup, 1);
2467         }
2468
2469         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
2470
2471         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
2472                         &dd->user_cdev, &dd->user_class_dev);
2473         if (ret < 0)
2474                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
2475                               dd->ipath_unit + 1, name);
2476
2477         goto bail;
2478
2479 bail_user:
2480         user_cleanup();
2481 bail:
2482         return ret;
2483 }
2484
2485 void ipath_user_remove(struct ipath_devdata *dd)
2486 {
2487         cleanup_cdev(&dd->user_cdev, &dd->user_class_dev);
2488
2489         if (atomic_dec_return(&user_count) == 0) {
2490                 if (atomic_read(&user_setup) == 0)
2491                         goto bail;
2492
2493                 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
2494                 user_cleanup();
2495
2496                 atomic_set(&user_setup, 0);
2497         }
2498 bail:
2499         return;
2500 }