drivers/infiniband/hw/ipath/ipath_file_ops.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 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 <linux/slab.h>
  40 #include <linux/highmem.h>
  41 #include <linux/io.h>
  42 #include <linux/jiffies.h>
  43 #include <asm/pgtable.h>
  44
  45 #include "ipath_kernel.h"
  46 #include "ipath_common.h"
  47 #include "ipath_user_sdma.h"
  48
  49 static int ipath_open(struct inode *, struct file *);
  50 static int ipath_close(struct inode *, struct file *);
  51 static ssize_t ipath_write(struct file *, const char __user *, size_t,
  52                            loff_t *);
  53 static ssize_t ipath_writev(struct kiocb *, const struct iovec *,
  54                             unsigned long , loff_t);
  55 static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
  56 static int ipath_mmap(struct file *, struct vm_area_struct *);
  57
  58 static const struct file_operations ipath_file_ops = {
  59         .owner = THIS_MODULE,
  60         .write = ipath_write,
  61         .aio_write = ipath_writev,
  62         .open = ipath_open,
  63         .release = ipath_close,
  64         .poll = ipath_poll,
  65         .mmap = ipath_mmap,
  66         .llseek = noop_llseek,
  67 };
  68
  69 /*
  70  * Convert kernel virtual addresses to physical addresses so they don't
  71  * potentially conflict with the chip addresses used as mmap offsets.
  72  * It doesn't really matter what mmap offset we use as long as we can
  73  * interpret it correctly.
  74  */
  75 static u64 cvt_kvaddr(void *p)
  76 {
  77         struct page *page;
  78         u64 paddr = 0;
  79
  80         page = vmalloc_to_page(p);
  81         if (page)
  82                 paddr = page_to_pfn(page) << PAGE_SHIFT;
  83
  84         return paddr;
  85 }
  86
  87 static int ipath_get_base_info(struct file *fp,
  88                                void __user *ubase, size_t ubase_size)
  89 {
  90         struct ipath_portdata *pd = port_fp(fp);
  91         int ret = 0;
  92         struct ipath_base_info *kinfo = NULL;
  93         struct ipath_devdata *dd = pd->port_dd;
  94         unsigned subport_cnt;
  95         int shared, master;
  96         size_t sz;
  97
  98         subport_cnt = pd->port_subport_cnt;
  99         if (!subport_cnt) {
 100                 shared = 0;
 101                 master = 0;
 102                 subport_cnt = 1;
 103         } else {
 104                 shared = 1;
 105                 master = !subport_fp(fp);
 106         }
 107
 108         sz = sizeof(*kinfo);
 109         /* If port sharing is not requested, allow the old size structure */
 110         if (!shared)
 111                 sz -= 7 * sizeof(u64);
 112         if (ubase_size < sz) {
 113                 ipath_cdbg(PROC,
 114                            "Base size %zu, need %zu (version mismatch?)\n",
 115                            ubase_size, sz);
 116                 ret = -EINVAL;
 117                 goto bail;
 118         }
 119
 120         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
 121         if (kinfo == NULL) {
 122                 ret = -ENOMEM;
 123                 goto bail;
 124         }
 125
 126         ret = dd->ipath_f_get_base_info(pd, kinfo);
 127         if (ret < 0)
 128                 goto bail;
 129
 130         kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
 131         kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
 132         kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
 133         kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
 134         /*
 135          * have to mmap whole thing
 136          */
 137         kinfo->spi_rcv_egrbuftotlen =
 138                 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
 139         kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
 140         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
 141                 pd->port_rcvegrbuf_chunks;
 142         kinfo->spi_tidcnt = dd->ipath_rcvtidcnt / subport_cnt;
 143         if (master)
 144                 kinfo->spi_tidcnt += dd->ipath_rcvtidcnt % subport_cnt;
 145         /*
 146          * for this use, may be ipath_cfgports summed over all chips that
 147          * are are configured and present
 148          */
 149         kinfo->spi_nports = dd->ipath_cfgports;
 150         /* unit (chip/board) our port is on */
 151         kinfo->spi_unit = dd->ipath_unit;
 152         /* for now, only a single page */
 153         kinfo->spi_tid_maxsize = PAGE_SIZE;
 154
 155         /*
 156          * Doing this per port, and based on the skip value, etc.  This has
 157          * to be the actual buffer size, since the protocol code treats it
 158          * as an array.
 159          *
 160          * These have to be set to user addresses in the user code via mmap.
 161          * These values are used on return to user code for the mmap target
 162          * addresses only.  For 32 bit, same 44 bit address problem, so use
 163          * the physical address, not virtual.  Before 2.6.11, using the
 164          * page_address() macro worked, but in 2.6.11, even that returns the
 165          * full 64 bit address (upper bits all 1's).  So far, using the
 166          * physical addresses (or chip offsets, for chip mapping) works, but
 167          * no doubt some future kernel release will change that, and we'll be
 168          * on to yet another method of dealing with this.
 169          */
 170         kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
 171         kinfo->spi_rcvhdr_tailaddr = (u64) pd->port_rcvhdrqtailaddr_phys;
 172         kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
 173         kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
 174         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
 175                 (void *) dd->ipath_statusp -
 176                 (void *) dd->ipath_pioavailregs_dma;
 177         if (!shared) {
 178                 kinfo->spi_piocnt = pd->port_piocnt;
 179                 kinfo->spi_piobufbase = (u64) pd->port_piobufs;
 180                 kinfo->__spi_uregbase = (u64) dd->ipath_uregbase +
 181                         dd->ipath_ureg_align * pd->port_port;
 182         } else if (master) {
 183                 kinfo->spi_piocnt = (pd->port_piocnt / subport_cnt) +
 184                                     (pd->port_piocnt % subport_cnt);
 185                 /* Master's PIO buffers are after all the slave's */
 186                 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
 187                         dd->ipath_palign *
 188                         (pd->port_piocnt - kinfo->spi_piocnt);
 189         } else {
 190                 unsigned slave = subport_fp(fp) - 1;
 191
 192                 kinfo->spi_piocnt = pd->port_piocnt / subport_cnt;
 193                 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
 194                         dd->ipath_palign * kinfo->spi_piocnt * slave;
 195         }
 196
 197         if (shared) {
 198                 kinfo->spi_port_uregbase = (u64) dd->ipath_uregbase +
 199                         dd->ipath_ureg_align * pd->port_port;
 200                 kinfo->spi_port_rcvegrbuf = kinfo->spi_rcv_egrbufs;
 201                 kinfo->spi_port_rcvhdr_base = kinfo->spi_rcvhdr_base;
 202                 kinfo->spi_port_rcvhdr_tailaddr = kinfo->spi_rcvhdr_tailaddr;
 203
 204                 kinfo->__spi_uregbase = cvt_kvaddr(pd->subport_uregbase +
 205                         PAGE_SIZE * subport_fp(fp));
 206
 207                 kinfo->spi_rcvhdr_base = cvt_kvaddr(pd->subport_rcvhdr_base +
 208                         pd->port_rcvhdrq_size * subport_fp(fp));
 209                 kinfo->spi_rcvhdr_tailaddr = 0;
 210                 kinfo->spi_rcv_egrbufs = cvt_kvaddr(pd->subport_rcvegrbuf +
 211                         pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size *
 212                         subport_fp(fp));
 213
 214                 kinfo->spi_subport_uregbase =
 215                         cvt_kvaddr(pd->subport_uregbase);
 216                 kinfo->spi_subport_rcvegrbuf =
 217                         cvt_kvaddr(pd->subport_rcvegrbuf);
 218                 kinfo->spi_subport_rcvhdr_base =
 219                         cvt_kvaddr(pd->subport_rcvhdr_base);
 220                 ipath_cdbg(PROC, "port %u flags %x %llx %llx %llx\n",
 221                         kinfo->spi_port, kinfo->spi_runtime_flags,
 222                         (unsigned long long) kinfo->spi_subport_uregbase,
 223                         (unsigned long long) kinfo->spi_subport_rcvegrbuf,
 224                         (unsigned long long) kinfo->spi_subport_rcvhdr_base);
 225         }
 226
 227         /*
 228          * All user buffers are 2KB buffers.  If we ever support
 229          * giving 4KB buffers to user processes, this will need some
 230          * work.
 231          */
 232         kinfo->spi_pioindex = (kinfo->spi_piobufbase -
 233                 (dd->ipath_piobufbase & 0xffffffff)) / dd->ipath_palign;
 234         kinfo->spi_pioalign = dd->ipath_palign;
 235
 236         kinfo->spi_qpair = IPATH_KD_QP;
 237         /*
 238          * user mode PIO buffers are always 2KB, even when 4KB can
 239          * be received, and sent via the kernel; this is ibmaxlen
 240          * for 2K MTU.
 241          */
 242         kinfo->spi_piosize = dd->ipath_piosize2k - 2 * sizeof(u32);
 243         kinfo->spi_mtu = dd->ipath_ibmaxlen;    /* maxlen, not ibmtu */
 244         kinfo->spi_port = pd->port_port;
 245         kinfo->spi_subport = subport_fp(fp);
 246         kinfo->spi_sw_version = IPATH_KERN_SWVERSION;
 247         kinfo->spi_hw_version = dd->ipath_revision;
 248
 249         if (master) {
 250                 kinfo->spi_runtime_flags |= IPATH_RUNTIME_MASTER;
 251         }
 252
 253         sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
 254         if (copy_to_user(ubase, kinfo, sz))
 255                 ret = -EFAULT;
 256
 257 bail:
 258         kfree(kinfo);
 259         return ret;
 260 }
 261
 262 /**
 263  * ipath_tid_update - update a port TID
 264  * @pd: the port
 265  * @fp: the ipath device file
 266  * @ti: the TID information
 267  *
 268  * The new implementation as of Oct 2004 is that the driver assigns
 269  * the tid and returns it to the caller.   To make it easier to
 270  * catch bugs, and to reduce search time, we keep a cursor for
 271  * each port, walking the shadow tid array to find one that's not
 272  * in use.
 273  *
 274  * For now, if we can't allocate the full list, we fail, although
 275  * in the long run, we'll allocate as many as we can, and the
 276  * caller will deal with that by trying the remaining pages later.
 277  * That means that when we fail, we have to mark the tids as not in
 278  * use again, in our shadow copy.
 279  *
 280  * It's up to the caller to free the tids when they are done.
 281  * We'll unlock the pages as they free them.
 282  *
 283  * Also, right now we are locking one page at a time, but since
 284  * the intended use of this routine is for a single group of
 285  * virtually contiguous pages, that should change to improve
 286  * performance.
 287  */
 288 static int ipath_tid_update(struct ipath_portdata *pd, struct file *fp,
 289                             const struct ipath_tid_info *ti)
 290 {
 291         int ret = 0, ntids;
 292         u32 tid, porttid, cnt, i, tidcnt, tidoff;
 293         u16 *tidlist;
 294         struct ipath_devdata *dd = pd->port_dd;
 295         u64 physaddr;
 296         unsigned long vaddr;
 297         u64 __iomem *tidbase;
 298         unsigned long tidmap[8];
 299         struct page **pagep = NULL;
 300         unsigned subport = subport_fp(fp);
 301
 302         if (!dd->ipath_pageshadow) {
 303                 ret = -ENOMEM;
 304                 goto done;
 305         }
 306
 307         cnt = ti->tidcnt;
 308         if (!cnt) {
 309                 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
 310                           (unsigned long long) ti->tidlist);
 311                 /*
 312                  * Should we treat as success?  likely a bug
 313                  */
 314                 ret = -EFAULT;
 315                 goto done;
 316         }
 317         porttid = pd->port_port * dd->ipath_rcvtidcnt;
 318         if (!pd->port_subport_cnt) {
 319                 tidcnt = dd->ipath_rcvtidcnt;
 320                 tid = pd->port_tidcursor;
 321                 tidoff = 0;
 322         } else if (!subport) {
 323                 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
 324                          (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
 325                 tidoff = dd->ipath_rcvtidcnt - tidcnt;
 326                 porttid += tidoff;
 327                 tid = tidcursor_fp(fp);
 328         } else {
 329                 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
 330                 tidoff = tidcnt * (subport - 1);
 331                 porttid += tidoff;
 332                 tid = tidcursor_fp(fp);
 333         }
 334         if (cnt > tidcnt) {
 335                 /* make sure it all fits in port_tid_pg_list */
 336                 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
 337                          "TIDs, only trying max (%u)\n", cnt, tidcnt);
 338                 cnt = tidcnt;
 339         }
 340         pagep = &((struct page **) pd->port_tid_pg_list)[tidoff];
 341         tidlist = &((u16 *) &pagep[dd->ipath_rcvtidcnt])[tidoff];
 342
 343         memset(tidmap, 0, sizeof(tidmap));
 344         /* before decrement; chip actual # */
 345         ntids = tidcnt;
 346         tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
 347                                    dd->ipath_rcvtidbase +
 348                                    porttid * sizeof(*tidbase));
 349
 350         ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
 351                    pd->port_port, cnt, tid, tidbase);
 352
 353         /* virtual address of first page in transfer */
 354         vaddr = ti->tidvaddr;
 355         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
 356                        cnt * PAGE_SIZE)) {
 357                 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
 358                           (void *)vaddr, cnt);
 359                 ret = -EFAULT;
 360                 goto done;
 361         }
 362         ret = ipath_get_user_pages(vaddr, cnt, pagep);
 363         if (ret) {
 364                 if (ret == -EBUSY) {
 365                         ipath_dbg("Failed to lock addr %p, %u pages "
 366                                   "(already locked)\n",
 367                                   (void *) vaddr, cnt);
 368                         /*
 369                          * for now, continue, and see what happens but with
 370                          * the new implementation, this should never happen,
 371                          * unless perhaps the user has mpin'ed the pages
 372                          * themselves (something we need to test)
 373                          */
 374                         ret = 0;
 375                 } else {
 376                         dev_info(&dd->pcidev->dev,
 377                                  "Failed to lock addr %p, %u pages: "
 378                                  "errno %d\n", (void *) vaddr, cnt, -ret);
 379                         goto done;
 380                 }
 381         }
 382         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
 383                 for (; ntids--; tid++) {
 384                         if (tid == tidcnt)
 385                                 tid = 0;
 386                         if (!dd->ipath_pageshadow[porttid + tid])
 387                                 break;
 388                 }
 389                 if (ntids < 0) {
 390                         /*
 391                          * oops, wrapped all the way through their TIDs,
 392                          * and didn't have enough free; see comments at
 393                          * start of routine
 394                          */
 395                         ipath_dbg("Not enough free TIDs for %u pages "
 396                                   "(index %d), failing\n", cnt, i);
 397                         i--;    /* last tidlist[i] not filled in */
 398                         ret = -ENOMEM;
 399                         break;
 400                 }
 401                 tidlist[i] = tid + tidoff;
 402                 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
 403                            "vaddr %lx\n", i, tid + tidoff, vaddr);
 404                 /* we "know" system pages and TID pages are same size */
 405                 dd->ipath_pageshadow[porttid + tid] = pagep[i];
 406                 dd->ipath_physshadow[porttid + tid] = ipath_map_page(
 407                         dd->pcidev, pagep[i], 0, PAGE_SIZE,
 408                         PCI_DMA_FROMDEVICE);
 409                 /*
 410                  * don't need atomic or it's overhead
 411                  */
 412                 __set_bit(tid, tidmap);
 413                 physaddr = dd->ipath_physshadow[porttid + tid];
 414                 ipath_stats.sps_pagelocks++;
 415                 ipath_cdbg(VERBOSE,
 416                            "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
 417                            tid, vaddr, (unsigned long long) physaddr,
 418                            pagep[i]);
 419                 dd->ipath_f_put_tid(dd, &tidbase[tid], RCVHQ_RCV_TYPE_EXPECTED,
 420                                     physaddr);
 421                 /*
 422                  * don't check this tid in ipath_portshadow, since we
 423                  * just filled it in; start with the next one.
 424                  */
 425                 tid++;
 426         }
 427
 428         if (ret) {
 429                 u32 limit;
 430         cleanup:
 431                 /* jump here if copy out of updated info failed... */
 432                 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
 433                           -ret, i, cnt);
 434                 /* same code that's in ipath_free_tid() */
 435                 limit = sizeof(tidmap) * BITS_PER_BYTE;
 436                 if (limit > tidcnt)
 437                         /* just in case size changes in future */
 438                         limit = tidcnt;
 439                 tid = find_first_bit((const unsigned long *)tidmap, limit);
 440                 for (; tid < limit; tid++) {
 441                         if (!test_bit(tid, tidmap))
 442                                 continue;
 443                         if (dd->ipath_pageshadow[porttid + tid]) {
 444                                 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
 445                                            tid);
 446                                 dd->ipath_f_put_tid(dd, &tidbase[tid],
 447                                                     RCVHQ_RCV_TYPE_EXPECTED,
 448                                                     dd->ipath_tidinvalid);
 449                                 pci_unmap_page(dd->pcidev,
 450                                         dd->ipath_physshadow[porttid + tid],
 451                                         PAGE_SIZE, PCI_DMA_FROMDEVICE);
 452                                 dd->ipath_pageshadow[porttid + tid] = NULL;
 453                                 ipath_stats.sps_pageunlocks++;
 454                         }
 455                 }
 456                 ipath_release_user_pages(pagep, cnt);
 457         } else {
 458                 /*
 459                  * Copy the updated array, with ipath_tid's filled in, back
 460                  * to user.  Since we did the copy in already, this "should
 461                  * never fail" If it does, we have to clean up...
 462                  */
 463                 if (copy_to_user((void __user *)
 464                                  (unsigned long) ti->tidlist,
 465                                  tidlist, cnt * sizeof(*tidlist))) {
 466                         ret = -EFAULT;
 467                         goto cleanup;
 468                 }
 469                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
 470                                  tidmap, sizeof tidmap)) {
 471                         ret = -EFAULT;
 472                         goto cleanup;
 473                 }
 474                 if (tid == tidcnt)
 475                         tid = 0;
 476                 if (!pd->port_subport_cnt)
 477                         pd->port_tidcursor = tid;
 478                 else
 479                         tidcursor_fp(fp) = tid;
 480         }
 481
 482 done:
 483         if (ret)
 484                 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
 485                           ti->tidcnt, -ret);
 486         return ret;
 487 }
 488
 489 /**
 490  * ipath_tid_free - free a port TID
 491  * @pd: the port
 492  * @subport: the subport
 493  * @ti: the TID info
 494  *
 495  * right now we are unlocking one page at a time, but since
 496  * the intended use of this routine is for a single group of
 497  * virtually contiguous pages, that should change to improve
 498  * performance.  We check that the TID is in range for this port
 499  * but otherwise don't check validity; if user has an error and
 500  * frees the wrong tid, it's only their own data that can thereby
 501  * be corrupted.  We do check that the TID was in use, for sanity
 502  * We always use our idea of the saved address, not the address that
 503  * they pass in to us.
 504  */
 505
 506 static int ipath_tid_free(struct ipath_portdata *pd, unsigned subport,
 507                           const struct ipath_tid_info *ti)
 508 {
 509         int ret = 0;
 510         u32 tid, porttid, cnt, limit, tidcnt;
 511         struct ipath_devdata *dd = pd->port_dd;
 512         u64 __iomem *tidbase;
 513         unsigned long tidmap[8];
 514
 515         if (!dd->ipath_pageshadow) {
 516                 ret = -ENOMEM;
 517                 goto done;
 518         }
 519
 520         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
 521                            sizeof tidmap)) {
 522                 ret = -EFAULT;
 523                 goto done;
 524         }
 525
 526         porttid = pd->port_port * dd->ipath_rcvtidcnt;
 527         if (!pd->port_subport_cnt)
 528                 tidcnt = dd->ipath_rcvtidcnt;
 529         else if (!subport) {
 530                 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
 531                          (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
 532                 porttid += dd->ipath_rcvtidcnt - tidcnt;
 533         } else {
 534                 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
 535                 porttid += tidcnt * (subport - 1);
 536         }
 537         tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
 538                                    dd->ipath_rcvtidbase +
 539                                    porttid * sizeof(*tidbase));
 540
 541         limit = sizeof(tidmap) * BITS_PER_BYTE;
 542         if (limit > tidcnt)
 543                 /* just in case size changes in future */
 544                 limit = tidcnt;
 545         tid = find_first_bit(tidmap, limit);
 546         ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
 547                    "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
 548                    limit, tid, porttid);
 549         for (cnt = 0; tid < limit; tid++) {
 550                 /*
 551                  * small optimization; if we detect a run of 3 or so without
 552                  * any set, use find_first_bit again.  That's mainly to
 553                  * accelerate the case where we wrapped, so we have some at
 554                  * the beginning, and some at the end, and a big gap
 555                  * in the middle.
 556                  */
 557                 if (!test_bit(tid, tidmap))
 558                         continue;
 559                 cnt++;
 560                 if (dd->ipath_pageshadow[porttid + tid]) {
 561                         struct page *p;
 562                         p = dd->ipath_pageshadow[porttid + tid];
 563                         dd->ipath_pageshadow[porttid + tid] = NULL;
 564                         ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
 565                                    pid_nr(pd->port_pid), tid);
 566                         dd->ipath_f_put_tid(dd, &tidbase[tid],
 567                                             RCVHQ_RCV_TYPE_EXPECTED,
 568                                             dd->ipath_tidinvalid);
 569                         pci_unmap_page(dd->pcidev,
 570                                 dd->ipath_physshadow[porttid + tid],
 571                                 PAGE_SIZE, PCI_DMA_FROMDEVICE);
 572                         ipath_release_user_pages(&p, 1);
 573                         ipath_stats.sps_pageunlocks++;
 574                 } else
 575                         ipath_dbg("Unused tid %u, ignoring\n", tid);
 576         }
 577         if (cnt != ti->tidcnt)
 578                 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
 579                           ti->tidcnt, cnt);
 580 done:
 581         if (ret)
 582                 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
 583                           ti->tidcnt, -ret);
 584         return ret;
 585 }
 586
 587 /**
 588  * ipath_set_part_key - set a partition key
 589  * @pd: the port
 590  * @key: the key
 591  *
 592  * We can have up to 4 active at a time (other than the default, which is
 593  * always allowed).  This is somewhat tricky, since multiple ports may set
 594  * the same key, so we reference count them, and clean up at exit.  All 4
 595  * partition keys are packed into a single infinipath register.  It's an
 596  * error for a process to set the same pkey multiple times.  We provide no
 597  * mechanism to de-allocate a pkey at this time, we may eventually need to
 598  * do that.  I've used the atomic operations, and no locking, and only make
 599  * a single pass through what's available.  This should be more than
 600  * adequate for some time. I'll think about spinlocks or the like if and as
 601  * it's necessary.
 602  */
 603 static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
 604 {
 605         struct ipath_devdata *dd = pd->port_dd;
 606         int i, any = 0, pidx = -1;
 607         u16 lkey = key & 0x7FFF;
 608         int ret;
 609
 610         if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) {
 611                 /* nothing to do; this key always valid */
 612                 ret = 0;
 613                 goto bail;
 614         }
 615
 616         ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
 617                    "%hx:%x %hx:%x %hx:%x %hx:%x\n",
 618                    pd->port_port, key, dd->ipath_pkeys[0],
 619                    atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
 620                    atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
 621                    atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
 622                    atomic_read(&dd->ipath_pkeyrefs[3]));
 623
 624         if (!lkey) {
 625                 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
 626                            pd->port_port);
 627                 ret = -EINVAL;
 628                 goto bail;
 629         }
 630
 631         /*
 632          * Set the full membership bit, because it has to be
 633          * set in the register or the packet, and it seems
 634          * cleaner to set in the register than to force all
 635          * callers to set it. (see bug 4331)
 636          */
 637         key |= 0x8000;
 638
 639         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
 640                 if (!pd->port_pkeys[i] && pidx == -1)
 641                         pidx = i;
 642                 if (pd->port_pkeys[i] == key) {
 643                         ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
 644                                    "(%x) more than once\n",
 645                                    pd->port_port, key);
 646                         ret = -EEXIST;
 647                         goto bail;
 648                 }
 649         }
 650         if (pidx == -1) {
 651                 ipath_dbg("All pkeys for port %u already in use, "
 652                           "can't set %x\n", pd->port_port, key);
 653                 ret = -EBUSY;
 654                 goto bail;
 655         }
 656         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
 657                 if (!dd->ipath_pkeys[i]) {
 658                         any++;
 659                         continue;
 660                 }
 661                 if (dd->ipath_pkeys[i] == key) {
 662                         atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
 663
 664                         if (atomic_inc_return(pkrefs) > 1) {
 665                                 pd->port_pkeys[pidx] = key;
 666                                 ipath_cdbg(VERBOSE, "p%u set key %x "
 667                                            "matches #%d, count now %d\n",
 668                                            pd->port_port, key, i,
 669                                            atomic_read(pkrefs));
 670                                 ret = 0;
 671                                 goto bail;
 672                         } else {
 673                                 /*
 674                                  * lost race, decrement count, catch below
 675                                  */
 676                                 atomic_dec(pkrefs);
 677                                 ipath_cdbg(VERBOSE, "Lost race, count was "
 678                                            "0, after dec, it's %d\n",
 679                                            atomic_read(pkrefs));
 680                                 any++;
 681                         }
 682                 }
 683                 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
 684                         /*
 685                          * It makes no sense to have both the limited and
 686                          * full membership PKEY set at the same time since
 687                          * the unlimited one will disable the limited one.
 688                          */
 689                         ret = -EEXIST;
 690                         goto bail;
 691                 }
 692         }
 693         if (!any) {
 694                 ipath_dbg("port %u, all pkeys already in use, "
 695                           "can't set %x\n", pd->port_port, key);
 696                 ret = -EBUSY;
 697                 goto bail;
 698         }
 699         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
 700                 if (!dd->ipath_pkeys[i] &&
 701                     atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
 702                         u64 pkey;
 703
 704                         /* for ipathstats, etc. */
 705                         ipath_stats.sps_pkeys[i] = lkey;
 706                         pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
 707                         pkey =
 708                                 (u64) dd->ipath_pkeys[0] |
 709                                 ((u64) dd->ipath_pkeys[1] << 16) |
 710                                 ((u64) dd->ipath_pkeys[2] << 32) |
 711                                 ((u64) dd->ipath_pkeys[3] << 48);
 712                         ipath_cdbg(PROC, "p%u set key %x in #%d, "
 713                                    "portidx %d, new pkey reg %llx\n",
 714                                    pd->port_port, key, i, pidx,
 715                                    (unsigned long long) pkey);
 716                         ipath_write_kreg(
 717                                 dd, dd->ipath_kregs->kr_partitionkey, pkey);
 718
 719                         ret = 0;
 720                         goto bail;
 721                 }
 722         }
 723         ipath_dbg("port %u, all pkeys already in use 2nd pass, "
 724                   "can't set %x\n", pd->port_port, key);
 725         ret = -EBUSY;
 726
 727 bail:
 728         return ret;
 729 }
 730
 731 /**
 732  * ipath_manage_rcvq - manage a port's receive queue
 733  * @pd: the port
 734  * @subport: the subport
 735  * @start_stop: action to carry out
 736  *
 737  * start_stop == 0 disables receive on the port, for use in queue
 738  * overflow conditions.  start_stop==1 re-enables, to be used to
 739  * re-init the software copy of the head register
 740  */
 741 static int ipath_manage_rcvq(struct ipath_portdata *pd, unsigned subport,
 742                              int start_stop)
 743 {
 744         struct ipath_devdata *dd = pd->port_dd;
 745
 746         ipath_cdbg(PROC, "%sabling rcv for unit %u port %u:%u\n",
 747                    start_stop ? "en" : "dis", dd->ipath_unit,
 748                    pd->port_port, subport);
 749         if (subport)
 750                 goto bail;
 751         /* atomically clear receive enable port. */
 752         if (start_stop) {
 753                 /*
 754                  * On enable, force in-memory copy of the tail register to
 755                  * 0, so that protocol code doesn't have to worry about
 756                  * whether or not the chip has yet updated the in-memory
 757                  * copy or not on return from the system call. The chip
 758                  * always resets it's tail register back to 0 on a
 759                  * transition from disabled to enabled.  This could cause a
 760                  * problem if software was broken, and did the enable w/o
 761                  * the disable, but eventually the in-memory copy will be
 762                  * updated and correct itself, even in the face of software
 763                  * bugs.
 764                  */
 765                 if (pd->port_rcvhdrtail_kvaddr)
 766                         ipath_clear_rcvhdrtail(pd);
 767                 set_bit(dd->ipath_r_portenable_shift + pd->port_port,
 768                         &dd->ipath_rcvctrl);
 769         } else
 770                 clear_bit(dd->ipath_r_portenable_shift + pd->port_port,
 771                           &dd->ipath_rcvctrl);
 772         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 773                          dd->ipath_rcvctrl);
 774         /* now be sure chip saw it before we return */
 775         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 776         if (start_stop) {
 777                 /*
 778                  * And try to be sure that tail reg update has happened too.
 779                  * This should in theory interlock with the RXE changes to
 780                  * the tail register.  Don't assign it to the tail register
 781                  * in memory copy, since we could overwrite an update by the
 782                  * chip if we did.
 783                  */
 784                 ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
 785         }
 786         /* always; new head should be equal to new tail; see above */
 787 bail:
 788         return 0;
 789 }
 790
 791 static void ipath_clean_part_key(struct ipath_portdata *pd,
 792                                  struct ipath_devdata *dd)
 793 {
 794         int i, j, pchanged = 0;
 795         u64 oldpkey;
 796
 797         /* for debugging only */
 798         oldpkey = (u64) dd->ipath_pkeys[0] |
 799                 ((u64) dd->ipath_pkeys[1] << 16) |
 800                 ((u64) dd->ipath_pkeys[2] << 32) |
 801                 ((u64) dd->ipath_pkeys[3] << 48);
 802
 803         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
 804                 if (!pd->port_pkeys[i])
 805                         continue;
 806                 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
 807                            pd->port_pkeys[i]);
 808                 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
 809                         /* check for match independent of the global bit */
 810                         if ((dd->ipath_pkeys[j] & 0x7fff) !=
 811                             (pd->port_pkeys[i] & 0x7fff))
 812                                 continue;
 813                         if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
 814                                 ipath_cdbg(VERBOSE, "p%u clear key "
 815                                            "%x matches #%d\n",
 816                                            pd->port_port,
 817                                            pd->port_pkeys[i], j);
 818                                 ipath_stats.sps_pkeys[j] =
 819                                         dd->ipath_pkeys[j] = 0;
 820                                 pchanged++;
 821                         }
 822                         else ipath_cdbg(
 823                                 VERBOSE, "p%u key %x matches #%d, "
 824                                 "but ref still %d\n", pd->port_port,
 825                                 pd->port_pkeys[i], j,
 826                                 atomic_read(&dd->ipath_pkeyrefs[j]));
 827                         break;
 828                 }
 829                 pd->port_pkeys[i] = 0;
 830         }
 831         if (pchanged) {
 832                 u64 pkey = (u64) dd->ipath_pkeys[0] |
 833                         ((u64) dd->ipath_pkeys[1] << 16) |
 834                         ((u64) dd->ipath_pkeys[2] << 32) |
 835                         ((u64) dd->ipath_pkeys[3] << 48);
 836                 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
 837                            "new pkey reg %llx\n", pd->port_port,
 838                            (unsigned long long) oldpkey,
 839                            (unsigned long long) pkey);
 840                 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
 841                                  pkey);
 842         }
 843 }
 844
 845 /*
 846  * Initialize the port data with the receive buffer sizes
 847  * so this can be done while the master port is locked.
 848  * Otherwise, there is a race with a slave opening the port
 849  * and seeing these fields uninitialized.
 850  */
 851 static void init_user_egr_sizes(struct ipath_portdata *pd)
 852 {
 853         struct ipath_devdata *dd = pd->port_dd;
 854         unsigned egrperchunk, egrcnt, size;
 855
 856         /*
 857          * to avoid wasting a lot of memory, we allocate 32KB chunks of
 858          * physically contiguous memory, advance through it until used up
 859          * and then allocate more.  Of course, we need memory to store those
 860          * extra pointers, now.  Started out with 256KB, but under heavy
 861          * memory pressure (creating large files and then copying them over
 862          * NFS while doing lots of MPI jobs), we hit some allocation
 863          * failures, even though we can sleep...  (2.6.10) Still get
 864          * failures at 64K.  32K is the lowest we can go without wasting
 865          * additional memory.
 866          */
 867         size = 0x8000;
 868         egrperchunk = size / dd->ipath_rcvegrbufsize;
 869         egrcnt = dd->ipath_rcvegrcnt;
 870         pd->port_rcvegrbuf_chunks = (egrcnt + egrperchunk - 1) / egrperchunk;
 871         pd->port_rcvegrbufs_perchunk = egrperchunk;
 872         pd->port_rcvegrbuf_size = size;
 873 }
 874
 875 /**
 876  * ipath_create_user_egr - allocate eager TID buffers
 877  * @pd: the port to allocate TID buffers for
 878  *
 879  * This routine is now quite different for user and kernel, because
 880  * the kernel uses skb's, for the accelerated network performance
 881  * This is the user port version
 882  *
 883  * Allocate the eager TID buffers and program them into infinipath
 884  * They are no longer completely contiguous, we do multiple allocation
 885  * calls.
 886  */
 887 static int ipath_create_user_egr(struct ipath_portdata *pd)
 888 {
 889         struct ipath_devdata *dd = pd->port_dd;
 890         unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
 891         size_t size;
 892         int ret;
 893         gfp_t gfp_flags;
 894
 895         /*
 896          * GFP_USER, but without GFP_FS, so buffer cache can be
 897          * coalesced (we hope); otherwise, even at order 4,
 898          * heavy filesystem activity makes these fail, and we can
 899          * use compound pages.
 900          */
 901         gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
 902
 903         egrcnt = dd->ipath_rcvegrcnt;
 904         /* TID number offset for this port */
 905         egroff = (pd->port_port - 1) * egrcnt + dd->ipath_p0_rcvegrcnt;
 906         egrsize = dd->ipath_rcvegrbufsize;
 907         ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
 908                    "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
 909
 910         chunk = pd->port_rcvegrbuf_chunks;
 911         egrperchunk = pd->port_rcvegrbufs_perchunk;
 912         size = pd->port_rcvegrbuf_size;
 913         pd->port_rcvegrbuf = kmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]),
 914                                      GFP_KERNEL);
 915         if (!pd->port_rcvegrbuf) {
 916                 ret = -ENOMEM;
 917                 goto bail;
 918         }
 919         pd->port_rcvegrbuf_phys =
 920                 kmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]),
 921                         GFP_KERNEL);
 922         if (!pd->port_rcvegrbuf_phys) {
 923                 ret = -ENOMEM;
 924                 goto bail_rcvegrbuf;
 925         }
 926         for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
 927
 928                 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
 929                         &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
 930                         gfp_flags);
 931
 932                 if (!pd->port_rcvegrbuf[e]) {
 933                         ret = -ENOMEM;
 934                         goto bail_rcvegrbuf_phys;
 935                 }
 936         }
 937
 938         pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
 939
 940         for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
 941                 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
 942                 unsigned i;
 943
 944                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
 945                         dd->ipath_f_put_tid(dd, e + egroff +
 946                                             (u64 __iomem *)
 947                                             ((char __iomem *)
 948                                              dd->ipath_kregbase +
 949                                              dd->ipath_rcvegrbase),
 950                                             RCVHQ_RCV_TYPE_EAGER, pa);
 951                         pa += egrsize;
 952                 }
 953                 cond_resched(); /* don't hog the cpu */
 954         }
 955
 956         ret = 0;
 957         goto bail;
 958
 959 bail_rcvegrbuf_phys:
 960         for (e = 0; e < pd->port_rcvegrbuf_chunks &&
 961                 pd->port_rcvegrbuf[e]; e++) {
 962                 dma_free_coherent(&dd->pcidev->dev, size,
 963                                   pd->port_rcvegrbuf[e],
 964                                   pd->port_rcvegrbuf_phys[e]);
 965
 966         }
 967         kfree(pd->port_rcvegrbuf_phys);
 968         pd->port_rcvegrbuf_phys = NULL;
 969 bail_rcvegrbuf:
 970         kfree(pd->port_rcvegrbuf);
 971         pd->port_rcvegrbuf = NULL;
 972 bail:
 973         return ret;
 974 }
 975
 976
 977 /* common code for the mappings on dma_alloc_coherent mem */
 978 static int ipath_mmap_mem(struct vm_area_struct *vma,
 979         struct ipath_portdata *pd, unsigned len, int write_ok,
 980         void *kvaddr, char *what)
 981 {
 982         struct ipath_devdata *dd = pd->port_dd;
 983         unsigned long pfn;
 984         int ret;
 985
 986         if ((vma->vm_end - vma->vm_start) > len) {
 987                 dev_info(&dd->pcidev->dev,
 988                          "FAIL on %s: len %lx > %x\n", what,
 989                          vma->vm_end - vma->vm_start, len);
 990                 ret = -EFAULT;
 991                 goto bail;
 992         }
 993
 994         if (!write_ok) {
 995                 if (vma->vm_flags & VM_WRITE) {
 996                         dev_info(&dd->pcidev->dev,
 997                                  "%s must be mapped readonly\n", what);
 998                         ret = -EPERM;
 999                         goto bail;
1000                 }
1001
1002                 /* don't allow them to later change with mprotect */
1003                 vma->vm_flags &= ~VM_MAYWRITE;
1004         }
1005
1006         pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
1007         ret = remap_pfn_range(vma, vma->vm_start, pfn,
1008                               len, vma->vm_page_prot);
1009         if (ret)
1010                 dev_info(&dd->pcidev->dev, "%s port%u mmap of %lx, %x "
1011                          "bytes r%c failed: %d\n", what, pd->port_port,
1012                          pfn, len, write_ok?'w':'o', ret);
1013         else
1014                 ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes "
1015                            "r%c\n", what, pd->port_port, pfn, len,
1016                            write_ok?'w':'o');
1017 bail:
1018         return ret;
1019 }
1020
1021 static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
1022                      u64 ureg)
1023 {
1024         unsigned long phys;
1025         int ret;
1026
1027         /*
1028          * This is real hardware, so use io_remap.  This is the mechanism
1029          * for the user process to update the head registers for their port
1030          * in the chip.
1031          */
1032         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1033                 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
1034                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
1035                 ret = -EFAULT;
1036         } else {
1037                 phys = dd->ipath_physaddr + ureg;
1038                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1039
1040                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1041                 ret = io_remap_pfn_range(vma, vma->vm_start,
1042                                          phys >> PAGE_SHIFT,
1043                                          vma->vm_end - vma->vm_start,
1044                                          vma->vm_page_prot);
1045         }
1046         return ret;
1047 }
1048
1049 static int mmap_piobufs(struct vm_area_struct *vma,
1050                         struct ipath_devdata *dd,
1051                         struct ipath_portdata *pd,
1052                         unsigned piobufs, unsigned piocnt)
1053 {
1054         unsigned long phys;
1055         int ret;
1056
1057         /*
1058          * When we map the PIO buffers in the chip, we want to map them as
1059          * writeonly, no read possible.   This prevents access to previous
1060          * process data, and catches users who might try to read the i/o
1061          * space due to a bug.
1062          */
1063         if ((vma->vm_end - vma->vm_start) > (piocnt * dd->ipath_palign)) {
1064                 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
1065                          "reqlen %lx > PAGE\n",
1066                          vma->vm_end - vma->vm_start);
1067                 ret = -EINVAL;
1068                 goto bail;
1069         }
1070
1071         phys = dd->ipath_physaddr + piobufs;
1072
1073 #if defined(__powerpc__)
1074         /* There isn't a generic way to specify writethrough mappings */
1075         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1076         pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
1077         pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
1078 #endif
1079
1080         /*
1081          * don't allow them to later change to readable with mprotect (for when
1082          * not initially mapped readable, as is normally the case)
1083          */
1084         vma->vm_flags &= ~VM_MAYREAD;
1085         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1086
1087         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1088                                  vma->vm_end - vma->vm_start,
1089                                  vma->vm_page_prot);
1090 bail:
1091         return ret;
1092 }
1093
1094 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1095                            struct ipath_portdata *pd)
1096 {
1097         struct ipath_devdata *dd = pd->port_dd;
1098         unsigned long start, size;
1099         size_t total_size, i;
1100         unsigned long pfn;
1101         int ret;
1102
1103         size = pd->port_rcvegrbuf_size;
1104         total_size = pd->port_rcvegrbuf_chunks * size;
1105         if ((vma->vm_end - vma->vm_start) > total_size) {
1106                 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1107                          "reqlen %lx > actual %lx\n",
1108                          vma->vm_end - vma->vm_start,
1109                          (unsigned long) total_size);
1110                 ret = -EINVAL;
1111                 goto bail;
1112         }
1113
1114         if (vma->vm_flags & VM_WRITE) {
1115                 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1116                          "writable (flags=%lx)\n", vma->vm_flags);
1117                 ret = -EPERM;
1118                 goto bail;
1119         }
1120         /* don't allow them to later change to writeable with mprotect */
1121         vma->vm_flags &= ~VM_MAYWRITE;
1122
1123         start = vma->vm_start;
1124
1125         for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1126                 pfn = virt_to_phys(pd->port_rcvegrbuf[i]) >> PAGE_SHIFT;
1127                 ret = remap_pfn_range(vma, start, pfn, size,
1128                                       vma->vm_page_prot);
1129                 if (ret < 0)
1130                         goto bail;
1131         }
1132         ret = 0;
1133
1134 bail:
1135         return ret;
1136 }
1137
1138 /*
1139  * ipath_file_vma_fault - handle a VMA page fault.
1140  */
1141 static int ipath_file_vma_fault(struct vm_area_struct *vma,
1142                                         struct vm_fault *vmf)
1143 {
1144         struct page *page;
1145
1146         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
1147         if (!page)
1148                 return VM_FAULT_SIGBUS;
1149         get_page(page);
1150         vmf->page = page;
1151
1152         return 0;
1153 }
1154
1155 static const struct vm_operations_struct ipath_file_vm_ops = {
1156         .fault = ipath_file_vma_fault,
1157 };
1158
1159 static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
1160                        struct ipath_portdata *pd, unsigned subport)
1161 {
1162         unsigned long len;
1163         struct ipath_devdata *dd;
1164         void *addr;
1165         size_t size;
1166         int ret = 0;
1167
1168         /* If the port is not shared, all addresses should be physical */
1169         if (!pd->port_subport_cnt)
1170                 goto bail;
1171
1172         dd = pd->port_dd;
1173         size = pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
1174
1175         /*
1176          * Each process has all the subport uregbase, rcvhdrq, and
1177          * rcvegrbufs mmapped - as an array for all the processes,
1178          * and also separately for this process.
1179          */
1180         if (pgaddr == cvt_kvaddr(pd->subport_uregbase)) {
1181                 addr = pd->subport_uregbase;
1182                 size = PAGE_SIZE * pd->port_subport_cnt;
1183         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base)) {
1184                 addr = pd->subport_rcvhdr_base;
1185                 size = pd->port_rcvhdrq_size * pd->port_subport_cnt;
1186         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf)) {
1187                 addr = pd->subport_rcvegrbuf;
1188                 size *= pd->port_subport_cnt;
1189         } else if (pgaddr == cvt_kvaddr(pd->subport_uregbase +
1190                                         PAGE_SIZE * subport)) {
1191                 addr = pd->subport_uregbase + PAGE_SIZE * subport;
1192                 size = PAGE_SIZE;
1193         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base +
1194                                 pd->port_rcvhdrq_size * subport)) {
1195                 addr = pd->subport_rcvhdr_base +
1196                         pd->port_rcvhdrq_size * subport;
1197                 size = pd->port_rcvhdrq_size;
1198         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf +
1199                                size * subport)) {
1200                 addr = pd->subport_rcvegrbuf + size * subport;
1201                 /* rcvegrbufs are read-only on the slave */
1202                 if (vma->vm_flags & VM_WRITE) {
1203                         dev_info(&dd->pcidev->dev,
1204                                  "Can't map eager buffers as "
1205                                  "writable (flags=%lx)\n", vma->vm_flags);
1206                         ret = -EPERM;
1207                         goto bail;
1208                 }
1209                 /*
1210                  * Don't allow permission to later change to writeable
1211                  * with mprotect.
1212                  */
1213                 vma->vm_flags &= ~VM_MAYWRITE;
1214         } else {
1215                 goto bail;
1216         }
1217         len = vma->vm_end - vma->vm_start;
1218         if (len > size) {
1219                 ipath_cdbg(MM, "FAIL: reqlen %lx > %zx\n", len, size);
1220                 ret = -EINVAL;
1221                 goto bail;
1222         }
1223
1224         vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
1225         vma->vm_ops = &ipath_file_vm_ops;
1226         vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
1227         ret = 1;
1228
1229 bail:
1230         return ret;
1231 }
1232
1233 /**
1234  * ipath_mmap - mmap various structures into user space
1235  * @fp: the file pointer
1236  * @vma: the VM area
1237  *
1238  * We use this to have a shared buffer between the kernel and the user code
1239  * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1240  * buffers in the chip.  We have the open and close entries so we can bump
1241  * the ref count and keep the driver from being unloaded while still mapped.
1242  */
1243 static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1244 {
1245         struct ipath_portdata *pd;
1246         struct ipath_devdata *dd;
1247         u64 pgaddr, ureg;
1248         unsigned piobufs, piocnt;
1249         int ret;
1250
1251         pd = port_fp(fp);
1252         if (!pd) {
1253                 ret = -EINVAL;
1254                 goto bail;
1255         }
1256         dd = pd->port_dd;
1257
1258         /*
1259          * This is the ipath_do_user_init() code, mapping the shared buffers
1260          * into the user process. The address referred to by vm_pgoff is the
1261          * file offset passed via mmap().  For shared ports, this is the
1262          * kernel vmalloc() address of the pages to share with the master.
1263          * For non-shared or master ports, this is a physical address.
1264          * We only do one mmap for each space mapped.
1265          */
1266         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1267
1268         /*
1269          * Check for 0 in case one of the allocations failed, but user
1270          * called mmap anyway.
1271          */
1272         if (!pgaddr)  {
1273                 ret = -EINVAL;
1274                 goto bail;
1275         }
1276
1277         ipath_cdbg(MM, "pgaddr %llx vm_start=%lx len %lx port %u:%u:%u\n",
1278                    (unsigned long long) pgaddr, vma->vm_start,
1279                    vma->vm_end - vma->vm_start, dd->ipath_unit,
1280                    pd->port_port, subport_fp(fp));
1281
1282         /*
1283          * Physical addresses must fit in 40 bits for our hardware.
1284          * Check for kernel virtual addresses first, anything else must
1285          * match a HW or memory address.
1286          */
1287         ret = mmap_kvaddr(vma, pgaddr, pd, subport_fp(fp));
1288         if (ret) {
1289                 if (ret > 0)
1290                         ret = 0;
1291                 goto bail;
1292         }
1293
1294         ureg = dd->ipath_uregbase + dd->ipath_ureg_align * pd->port_port;
1295         if (!pd->port_subport_cnt) {
1296                 /* port is not shared */
1297                 piocnt = pd->port_piocnt;
1298                 piobufs = pd->port_piobufs;
1299         } else if (!subport_fp(fp)) {
1300                 /* caller is the master */
1301                 piocnt = (pd->port_piocnt / pd->port_subport_cnt) +
1302                          (pd->port_piocnt % pd->port_subport_cnt);
1303                 piobufs = pd->port_piobufs +
1304                         dd->ipath_palign * (pd->port_piocnt - piocnt);
1305         } else {
1306                 unsigned slave = subport_fp(fp) - 1;
1307
1308                 /* caller is a slave */
1309                 piocnt = pd->port_piocnt / pd->port_subport_cnt;
1310                 piobufs = pd->port_piobufs + dd->ipath_palign * piocnt * slave;
1311         }
1312
1313         if (pgaddr == ureg)
1314                 ret = mmap_ureg(vma, dd, ureg);
1315         else if (pgaddr == piobufs)
1316                 ret = mmap_piobufs(vma, dd, pd, piobufs, piocnt);
1317         else if (pgaddr == dd->ipath_pioavailregs_phys)
1318                 /* in-memory copy of pioavail registers */
1319                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1320                                      (void *) dd->ipath_pioavailregs_dma,
1321                                      "pioavail registers");
1322         else if (pgaddr == pd->port_rcvegr_phys)
1323                 ret = mmap_rcvegrbufs(vma, pd);
1324         else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1325                 /*
1326                  * The rcvhdrq itself; readonly except on HT (so have
1327                  * to allow writable mapping), multiple pages, contiguous
1328                  * from an i/o perspective.
1329                  */
1330                 ret = ipath_mmap_mem(vma, pd, pd->port_rcvhdrq_size, 1,
1331                                      pd->port_rcvhdrq,
1332                                      "rcvhdrq");
1333         else if (pgaddr == (u64) pd->port_rcvhdrqtailaddr_phys)
1334                 /* in-memory copy of rcvhdrq tail register */
1335                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1336                                      pd->port_rcvhdrtail_kvaddr,
1337                                      "rcvhdrq tail");
1338         else
1339                 ret = -EINVAL;
1340
1341         vma->vm_private_data = NULL;
1342
1343         if (ret < 0)
1344                 dev_info(&dd->pcidev->dev,
1345                          "Failure %d on off %llx len %lx\n",
1346                          -ret, (unsigned long long)pgaddr,
1347                          vma->vm_end - vma->vm_start);
1348 bail:
1349         return ret;
1350 }
1351
1352 static unsigned ipath_poll_hdrqfull(struct ipath_portdata *pd)
1353 {
1354         unsigned pollflag = 0;
1355
1356         if ((pd->poll_type & IPATH_POLL_TYPE_OVERFLOW) &&
1357             pd->port_hdrqfull != pd->port_hdrqfull_poll) {
1358                 pollflag |= POLLIN | POLLRDNORM;
1359                 pd->port_hdrqfull_poll = pd->port_hdrqfull;
1360         }
1361
1362         return pollflag;
1363 }
1364
1365 static unsigned int ipath_poll_urgent(struct ipath_portdata *pd,
1366                                       struct file *fp,
1367                                       struct poll_table_struct *pt)
1368 {
1369         unsigned pollflag = 0;
1370         struct ipath_devdata *dd;
1371
1372         dd = pd->port_dd;
1373
1374         /* variable access in ipath_poll_hdrqfull() needs this */
1375         rmb();
1376         pollflag = ipath_poll_hdrqfull(pd);
1377
1378         if (pd->port_urgent != pd->port_urgent_poll) {
1379                 pollflag |= POLLIN | POLLRDNORM;
1380                 pd->port_urgent_poll = pd->port_urgent;
1381         }
1382
1383         if (!pollflag) {
1384                 /* this saves a spin_lock/unlock in interrupt handler... */
1385                 set_bit(IPATH_PORT_WAITING_URG, &pd->port_flag);
1386                 /* flush waiting flag so don't miss an event... */
1387                 wmb();
1388                 poll_wait(fp, &pd->port_wait, pt);
1389         }
1390
1391         return pollflag;
1392 }
1393
1394 static unsigned int ipath_poll_next(struct ipath_portdata *pd,
1395                                     struct file *fp,
1396                                     struct poll_table_struct *pt)
1397 {
1398         u32 head;
1399         u32 tail;
1400         unsigned pollflag = 0;
1401         struct ipath_devdata *dd;
1402
1403         dd = pd->port_dd;
1404
1405         /* variable access in ipath_poll_hdrqfull() needs this */
1406         rmb();
1407         pollflag = ipath_poll_hdrqfull(pd);
1408
1409         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1410         if (pd->port_rcvhdrtail_kvaddr)
1411                 tail = ipath_get_rcvhdrtail(pd);
1412         else
1413                 tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1414
1415         if (head != tail)
1416                 pollflag |= POLLIN | POLLRDNORM;
1417         else {
1418                 /* this saves a spin_lock/unlock in interrupt handler */
1419                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1420                 /* flush waiting flag so we don't miss an event */
1421                 wmb();
1422
1423                 set_bit(pd->port_port + dd->ipath_r_intravail_shift,
1424                         &dd->ipath_rcvctrl);
1425
1426                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1427                                  dd->ipath_rcvctrl);
1428
1429                 if (dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1430                         ipath_write_ureg(dd, ur_rcvhdrhead,
1431                                          dd->ipath_rhdrhead_intr_off | head,
1432                                          pd->port_port);
1433
1434                 poll_wait(fp, &pd->port_wait, pt);
1435         }
1436
1437         return pollflag;
1438 }
1439
1440 static unsigned int ipath_poll(struct file *fp,
1441                                struct poll_table_struct *pt)
1442 {
1443         struct ipath_portdata *pd;
1444         unsigned pollflag;
1445
1446         pd = port_fp(fp);
1447         if (!pd)
1448                 pollflag = 0;
1449         else if (pd->poll_type & IPATH_POLL_TYPE_URGENT)
1450                 pollflag = ipath_poll_urgent(pd, fp, pt);
1451         else
1452                 pollflag = ipath_poll_next(pd, fp, pt);
1453
1454         return pollflag;
1455 }
1456
1457 static int ipath_supports_subports(int user_swmajor, int user_swminor)
1458 {
1459         /* no subport implementation prior to software version 1.3 */
1460         return (user_swmajor > 1) || (user_swminor >= 3);
1461 }
1462
1463 static int ipath_compatible_subports(int user_swmajor, int user_swminor)
1464 {
1465         /* this code is written long-hand for clarity */
1466         if (IPATH_USER_SWMAJOR != user_swmajor) {
1467                 /* no promise of compatibility if major mismatch */
1468                 return 0;
1469         }
1470         if (IPATH_USER_SWMAJOR == 1) {
1471                 switch (IPATH_USER_SWMINOR) {
1472                 case 0:
1473                 case 1:
1474                 case 2:
1475                         /* no subport implementation so cannot be compatible */
1476                         return 0;
1477                 case 3:
1478                         /* 3 is only compatible with itself */
1479                         return user_swminor == 3;
1480                 default:
1481                         /* >= 4 are compatible (or are expected to be) */
1482                         return user_swminor >= 4;
1483                 }
1484         }
1485         /* make no promises yet for future major versions */
1486         return 0;
1487 }
1488
1489 static int init_subports(struct ipath_devdata *dd,
1490                          struct ipath_portdata *pd,
1491                          const struct ipath_user_info *uinfo)
1492 {
1493         int ret = 0;
1494         unsigned num_subports;
1495         size_t size;
1496
1497         /*
1498          * If the user is requesting zero subports,
1499          * skip the subport allocation.
1500          */
1501         if (uinfo->spu_subport_cnt <= 0)
1502                 goto bail;
1503
1504         /* Self-consistency check for ipath_compatible_subports() */
1505         if (ipath_supports_subports(IPATH_USER_SWMAJOR, IPATH_USER_SWMINOR) &&
1506             !ipath_compatible_subports(IPATH_USER_SWMAJOR,
1507                                        IPATH_USER_SWMINOR)) {
1508                 dev_info(&dd->pcidev->dev,
1509                          "Inconsistent ipath_compatible_subports()\n");
1510                 goto bail;
1511         }
1512
1513         /* Check for subport compatibility */
1514         if (!ipath_compatible_subports(uinfo->spu_userversion >> 16,
1515                                        uinfo->spu_userversion & 0xffff)) {
1516                 dev_info(&dd->pcidev->dev,
1517                          "Mismatched user version (%d.%d) and driver "
1518                          "version (%d.%d) while port sharing. Ensure "
1519                          "that driver and library are from the same "
1520                          "release.\n",
1521                          (int) (uinfo->spu_userversion >> 16),
1522                          (int) (uinfo->spu_userversion & 0xffff),
1523                          IPATH_USER_SWMAJOR,
1524                          IPATH_USER_SWMINOR);
1525                 goto bail;
1526         }
1527         if (uinfo->spu_subport_cnt > INFINIPATH_MAX_SUBPORT) {
1528                 ret = -EINVAL;
1529                 goto bail;
1530         }
1531
1532         num_subports = uinfo->spu_subport_cnt;
1533         pd->subport_uregbase = vzalloc(PAGE_SIZE * num_subports);
1534         if (!pd->subport_uregbase) {
1535                 ret = -ENOMEM;
1536                 goto bail;
1537         }
1538         /* Note: pd->port_rcvhdrq_size isn't initialized yet. */
1539         size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1540                      sizeof(u32), PAGE_SIZE) * num_subports;
1541         pd->subport_rcvhdr_base = vzalloc(size);
1542         if (!pd->subport_rcvhdr_base) {
1543                 ret = -ENOMEM;
1544                 goto bail_ureg;
1545         }
1546
1547         pd->subport_rcvegrbuf = vzalloc(pd->port_rcvegrbuf_chunks *
1548                                         pd->port_rcvegrbuf_size *
1549                                         num_subports);
1550         if (!pd->subport_rcvegrbuf) {
1551                 ret = -ENOMEM;
1552                 goto bail_rhdr;
1553         }
1554
1555         pd->port_subport_cnt = uinfo->spu_subport_cnt;
1556         pd->port_subport_id = uinfo->spu_subport_id;
1557         pd->active_slaves = 1;
1558         set_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1559         goto bail;
1560
1561 bail_rhdr:
1562         vfree(pd->subport_rcvhdr_base);
1563 bail_ureg:
1564         vfree(pd->subport_uregbase);
1565         pd->subport_uregbase = NULL;
1566 bail:
1567         return ret;
1568 }
1569
1570 static int try_alloc_port(struct ipath_devdata *dd, int port,
1571                           struct file *fp,
1572                           const struct ipath_user_info *uinfo)
1573 {
1574         struct ipath_portdata *pd;
1575         int ret;
1576
1577         if (!(pd = dd->ipath_pd[port])) {
1578                 void *ptmp;
1579
1580                 pd = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1581
1582                 /*
1583                  * Allocate memory for use in ipath_tid_update() just once
1584                  * at open, not per call.  Reduces cost of expected send
1585                  * setup.
1586                  */
1587                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1588                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1589                                GFP_KERNEL);
1590                 if (!pd || !ptmp) {
1591                         ipath_dev_err(dd, "Unable to allocate portdata "
1592                                       "memory, failing open\n");
1593                         ret = -ENOMEM;
1594                         kfree(pd);
1595                         kfree(ptmp);
1596                         goto bail;
1597                 }
1598                 dd->ipath_pd[port] = pd;
1599                 dd->ipath_pd[port]->port_port = port;
1600                 dd->ipath_pd[port]->port_dd = dd;
1601                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1602                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1603         }
1604         if (!pd->port_cnt) {
1605                 pd->userversion = uinfo->spu_userversion;
1606                 init_user_egr_sizes(pd);
1607                 if ((ret = init_subports(dd, pd, uinfo)) != 0)
1608                         goto bail;
1609                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1610                            current->comm, current->pid, dd->ipath_unit,
1611                            port);
1612                 pd->port_cnt = 1;
1613                 port_fp(fp) = pd;
1614                 pd->port_pid = get_pid(task_pid(current));
1615                 strlcpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
1616                 ipath_stats.sps_ports++;
1617                 ret = 0;
1618         } else
1619                 ret = -EBUSY;
1620
1621 bail:
1622         return ret;
1623 }
1624
1625 static inline int usable(struct ipath_devdata *dd)
1626 {
1627         return dd &&
1628                 (dd->ipath_flags & IPATH_PRESENT) &&
1629                 dd->ipath_kregbase &&
1630                 dd->ipath_lid &&
1631                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1632                                      | IPATH_LINKUNK));
1633 }
1634
1635 static int find_free_port(int unit, struct file *fp,
1636                           const struct ipath_user_info *uinfo)
1637 {
1638         struct ipath_devdata *dd = ipath_lookup(unit);
1639         int ret, i;
1640
1641         if (!dd) {
1642                 ret = -ENODEV;
1643                 goto bail;
1644         }
1645
1646         if (!usable(dd)) {
1647                 ret = -ENETDOWN;
1648                 goto bail;
1649         }
1650
1651         for (i = 1; i < dd->ipath_cfgports; i++) {
1652                 ret = try_alloc_port(dd, i, fp, uinfo);
1653                 if (ret != -EBUSY)
1654                         goto bail;
1655         }
1656         ret = -EBUSY;
1657
1658 bail:
1659         return ret;
1660 }
1661
1662 static int find_best_unit(struct file *fp,
1663                           const struct ipath_user_info *uinfo)
1664 {
1665         int ret = 0, i, prefunit = -1, devmax;
1666         int maxofallports, npresent, nup;
1667         int ndev;
1668
1669         devmax = ipath_count_units(&npresent, &nup, &maxofallports);
1670
1671         /*
1672          * This code is present to allow a knowledgeable person to
1673          * specify the layout of processes to processors before opening
1674          * this driver, and then we'll assign the process to the "closest"
1675          * InfiniPath chip to that processor (we assume reasonable connectivity,
1676          * for now).  This code assumes that if affinity has been set
1677          * before this point, that at most one cpu is set; for now this
1678          * is reasonable.  I check for both cpumask_empty() and cpumask_full(),
1679          * in case some kernel variant sets none of the bits when no
1680          * affinity is set.  2.6.11 and 12 kernels have all present
1681          * cpus set.  Some day we'll have to fix it up further to handle
1682          * a cpu subset.  This algorithm fails for two HT chips connected
1683          * in tunnel fashion.  Eventually this needs real topology
1684          * information.  There may be some issues with dual core numbering
1685          * as well.  This needs more work prior to release.
1686          */
1687         if (!cpumask_empty(&current->cpus_allowed) &&
1688             !cpumask_full(&current->cpus_allowed)) {
1689                 int ncpus = num_online_cpus(), curcpu = -1, nset = 0;
1690                 for (i = 0; i < ncpus; i++)
1691                         if (cpumask_test_cpu(i, &current->cpus_allowed)) {
1692                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1693                                            "cpu %d/%d\n", current->comm,
1694                                            current->pid, i, ncpus);
1695                                 curcpu = i;
1696                                 nset++;
1697                         }
1698                 if (curcpu != -1 && nset != ncpus) {
1699                         if (npresent) {
1700                                 prefunit = curcpu / (ncpus / npresent);
1701                                 ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, "
1702                                           "%d cpus/chip, select unit %d\n",
1703                                           current->comm, current->pid,
1704                                           npresent, ncpus, ncpus / npresent,
1705                                           prefunit);
1706                         }
1707                 }
1708         }
1709
1710         /*
1711          * user ports start at 1, kernel port is 0
1712          * For now, we do round-robin access across all chips
1713          */
1714
1715         if (prefunit != -1)
1716                 devmax = prefunit + 1;
1717 recheck:
1718         for (i = 1; i < maxofallports; i++) {
1719                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1720                      ndev++) {
1721                         struct ipath_devdata *dd = ipath_lookup(ndev);
1722
1723                         if (!usable(dd))
1724                                 continue; /* can't use this unit */
1725                         if (i >= dd->ipath_cfgports)
1726                                 /*
1727                                  * Maxed out on users of this unit. Try
1728                                  * next.
1729                                  */
1730                                 continue;
1731                         ret = try_alloc_port(dd, i, fp, uinfo);
1732                         if (!ret)
1733                                 goto done;
1734                 }
1735         }
1736
1737         if (npresent) {
1738                 if (nup == 0) {
1739                         ret = -ENETDOWN;
1740                         ipath_dbg("No ports available (none initialized "
1741                                   "and ready)\n");
1742                 } else {
1743                         if (prefunit > 0) {
1744                                 /* if started above 0, retry from 0 */
1745                                 ipath_cdbg(PROC,
1746                                            "%s[%u] no ports on prefunit "
1747                                            "%d, clear and re-check\n",
1748                                            current->comm, current->pid,
1749                                            prefunit);
1750                                 devmax = ipath_count_units(NULL, NULL,
1751                                                            NULL);
1752                                 prefunit = -1;
1753                                 goto recheck;
1754                         }
1755                         ret = -EBUSY;
1756                         ipath_dbg("No ports available\n");
1757                 }
1758         } else {
1759                 ret = -ENXIO;
1760                 ipath_dbg("No boards found\n");
1761         }
1762
1763 done:
1764         return ret;
1765 }
1766
1767 static int find_shared_port(struct file *fp,
1768                             const struct ipath_user_info *uinfo)
1769 {
1770         int devmax, ndev, i;
1771         int ret = 0;
1772
1773         devmax = ipath_count_units(NULL, NULL, NULL);
1774
1775         for (ndev = 0; ndev < devmax; ndev++) {
1776                 struct ipath_devdata *dd = ipath_lookup(ndev);
1777
1778                 if (!usable(dd))
1779                         continue;
1780                 for (i = 1; i < dd->ipath_cfgports; i++) {
1781                         struct ipath_portdata *pd = dd->ipath_pd[i];
1782
1783                         /* Skip ports which are not yet open */
1784                         if (!pd || !pd->port_cnt)
1785                                 continue;
1786                         /* Skip port if it doesn't match the requested one */
1787                         if (pd->port_subport_id != uinfo->spu_subport_id)
1788                                 continue;
1789                         /* Verify the sharing process matches the master */
1790                         if (pd->port_subport_cnt != uinfo->spu_subport_cnt ||
1791                             pd->userversion != uinfo->spu_userversion ||
1792                             pd->port_cnt >= pd->port_subport_cnt) {
1793                                 ret = -EINVAL;
1794                                 goto done;
1795                         }
1796                         port_fp(fp) = pd;
1797                         subport_fp(fp) = pd->port_cnt++;
1798                         pd->port_subpid[subport_fp(fp)] =
1799                                 get_pid(task_pid(current));
1800                         tidcursor_fp(fp) = 0;
1801                         pd->active_slaves |= 1 << subport_fp(fp);
1802                         ipath_cdbg(PROC,
1803                                    "%s[%u] %u sharing %s[%u] unit:port %u:%u\n",
1804                                    current->comm, current->pid,
1805                                    subport_fp(fp),
1806                                    pd->port_comm, pid_nr(pd->port_pid),
1807                                    dd->ipath_unit, pd->port_port);
1808                         ret = 1;
1809                         goto done;
1810                 }
1811         }
1812
1813 done:
1814         return ret;
1815 }
1816
1817 static int ipath_open(struct inode *in, struct file *fp)
1818 {
1819         /* The real work is performed later in ipath_assign_port() */
1820         fp->private_data = kzalloc(sizeof(struct ipath_filedata), GFP_KERNEL);
1821         return fp->private_data ? 0 : -ENOMEM;
1822 }
1823
1824 /* Get port early, so can set affinity prior to memory allocation */
1825 static int ipath_assign_port(struct file *fp,
1826                               const struct ipath_user_info *uinfo)
1827 {
1828         int ret;
1829         int i_minor;
1830         unsigned swmajor, swminor;
1831
1832         /* Check to be sure we haven't already initialized this file */
1833         if (port_fp(fp)) {
1834                 ret = -EINVAL;
1835                 goto done;
1836         }
1837
1838         /* for now, if major version is different, bail */
1839         swmajor = uinfo->spu_userversion >> 16;
1840         if (swmajor != IPATH_USER_SWMAJOR) {
1841                 ipath_dbg("User major version %d not same as driver "
1842                           "major %d\n", uinfo->spu_userversion >> 16,
1843                           IPATH_USER_SWMAJOR);
1844                 ret = -ENODEV;
1845                 goto done;
1846         }
1847
1848         swminor = uinfo->spu_userversion & 0xffff;
1849         if (swminor != IPATH_USER_SWMINOR)
1850                 ipath_dbg("User minor version %d not same as driver "
1851                           "minor %d\n", swminor, IPATH_USER_SWMINOR);
1852
1853         mutex_lock(&ipath_mutex);
1854
1855         if (ipath_compatible_subports(swmajor, swminor) &&
1856             uinfo->spu_subport_cnt &&
1857             (ret = find_shared_port(fp, uinfo))) {
1858                 if (ret > 0)
1859                         ret = 0;
1860                 goto done_chk_sdma;
1861         }
1862
1863         i_minor = iminor(fp->f_path.dentry->d_inode) - IPATH_USER_MINOR_BASE;
1864         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1865                    (long)fp->f_path.dentry->d_inode->i_rdev, i_minor);
1866
1867         if (i_minor)
1868                 ret = find_free_port(i_minor - 1, fp, uinfo);
1869         else
1870                 ret = find_best_unit(fp, uinfo);
1871
1872 done_chk_sdma:
1873         if (!ret) {
1874                 struct ipath_filedata *fd = fp->private_data;
1875                 const struct ipath_portdata *pd = fd->pd;
1876                 const struct ipath_devdata *dd = pd->port_dd;
1877
1878                 fd->pq = ipath_user_sdma_queue_create(&dd->pcidev->dev,
1879                                                       dd->ipath_unit,
1880                                                       pd->port_port,
1881                                                       fd->subport);
1882
1883                 if (!fd->pq)
1884                         ret = -ENOMEM;
1885         }
1886
1887         mutex_unlock(&ipath_mutex);
1888
1889 done:
1890         return ret;
1891 }
1892
1893
1894 static int ipath_do_user_init(struct file *fp,
1895                               const struct ipath_user_info *uinfo)
1896 {
1897         int ret;
1898         struct ipath_portdata *pd = port_fp(fp);
1899         struct ipath_devdata *dd;
1900         u32 head32;
1901
1902         /* Subports don't need to initialize anything since master did it. */
1903         if (subport_fp(fp)) {
1904                 ret = wait_event_interruptible(pd->port_wait,
1905                         !test_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag));
1906                 goto done;
1907         }
1908
1909         dd = pd->port_dd;
1910
1911         if (uinfo->spu_rcvhdrsize) {
1912                 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
1913                 if (ret)
1914                         goto done;
1915         }
1916
1917         /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
1918
1919         /* some ports may get extra buffers, calculate that here */
1920         if (pd->port_port <= dd->ipath_ports_extrabuf)
1921                 pd->port_piocnt = dd->ipath_pbufsport + 1;
1922         else
1923                 pd->port_piocnt = dd->ipath_pbufsport;
1924
1925         /* for right now, kernel piobufs are at end, so port 1 is at 0 */
1926         if (pd->port_port <= dd->ipath_ports_extrabuf)
1927                 pd->port_pio_base = (dd->ipath_pbufsport + 1)
1928                         * (pd->port_port - 1);
1929         else
1930                 pd->port_pio_base = dd->ipath_ports_extrabuf +
1931                         dd->ipath_pbufsport * (pd->port_port - 1);
1932         pd->port_piobufs = dd->ipath_piobufbase +
1933                 pd->port_pio_base * dd->ipath_palign;
1934         ipath_cdbg(VERBOSE, "piobuf base for port %u is 0x%x, piocnt %u,"
1935                 " first pio %u\n", pd->port_port, pd->port_piobufs,
1936                 pd->port_piocnt, pd->port_pio_base);
1937         ipath_chg_pioavailkernel(dd, pd->port_pio_base, pd->port_piocnt, 0);
1938
1939         /*
1940          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1941          * array for time being.  If pd->port_port > chip-supported,
1942          * we need to do extra stuff here to handle by handling overflow
1943          * through port 0, someday
1944          */
1945         ret = ipath_create_rcvhdrq(dd, pd);
1946         if (!ret)
1947                 ret = ipath_create_user_egr(pd);
1948         if (ret)
1949                 goto done;
1950
1951         /*
1952          * set the eager head register for this port to the current values
1953          * of the tail pointers, since we don't know if they were
1954          * updated on last use of the port.
1955          */
1956         head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
1957         ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
1958         pd->port_lastrcvhdrqtail = -1;
1959         ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n",
1960                 pd->port_port, head32);
1961         pd->port_tidcursor = 0; /* start at beginning after open */
1962
1963         /* initialize poll variables... */
1964         pd->port_urgent = 0;
1965         pd->port_urgent_poll = 0;
1966         pd->port_hdrqfull_poll = pd->port_hdrqfull;
1967
1968         /*
1969          * Now enable the port for receive.
1970          * For chips that are set to DMA the tail register to memory
1971          * when they change (and when the update bit transitions from
1972          * 0 to 1.  So for those chips, we turn it off and then back on.
1973          * This will (very briefly) affect any other open ports, but the
1974          * duration is very short, and therefore isn't an issue.  We
1975          * explicitly set the in-memory tail copy to 0 beforehand, so we
1976          * don't have to wait to be sure the DMA update has happened
1977          * (chip resets head/tail to 0 on transition to enable).
1978          */
1979         set_bit(dd->ipath_r_portenable_shift + pd->port_port,
1980                 &dd->ipath_rcvctrl);
1981         if (!(dd->ipath_flags & IPATH_NODMA_RTAIL)) {
1982                 if (pd->port_rcvhdrtail_kvaddr)
1983                         ipath_clear_rcvhdrtail(pd);
1984                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1985                         dd->ipath_rcvctrl &
1986                         ~(1ULL << dd->ipath_r_tailupd_shift));
1987         }
1988         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1989                          dd->ipath_rcvctrl);
1990         /* Notify any waiting slaves */
1991         if (pd->port_subport_cnt) {
1992                 clear_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1993                 wake_up(&pd->port_wait);
1994         }
1995 done:
1996         return ret;
1997 }
1998
1999 /**
2000  * unlock_exptid - unlock any expected TID entries port still had in use
2001  * @pd: port
2002  *
2003  * We don't actually update the chip here, because we do a bulk update
2004  * below, using ipath_f_clear_tids.
2005  */
2006 static void unlock_expected_tids(struct ipath_portdata *pd)
2007 {
2008         struct ipath_devdata *dd = pd->port_dd;
2009         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
2010         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
2011
2012         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
2013                    pd->port_port);
2014         for (i = port_tidbase; i < maxtid; i++) {
2015                 struct page *ps = dd->ipath_pageshadow[i];
2016
2017                 if (!ps)
2018                         continue;
2019
2020                 dd->ipath_pageshadow[i] = NULL;
2021                 pci_unmap_page(dd->pcidev, dd->ipath_physshadow[i],
2022                         PAGE_SIZE, PCI_DMA_FROMDEVICE);
2023                 ipath_release_user_pages_on_close(&ps, 1);
2024                 cnt++;
2025                 ipath_stats.sps_pageunlocks++;
2026         }
2027         if (cnt)
2028                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
2029                            pd->port_port, cnt);
2030
2031         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
2032                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
2033                            (unsigned long long) ipath_stats.sps_pagelocks,
2034                            (unsigned long long)
2035                            ipath_stats.sps_pageunlocks);
2036 }
2037
2038 static int ipath_close(struct inode *in, struct file *fp)
2039 {
2040         int ret = 0;
2041         struct ipath_filedata *fd;
2042         struct ipath_portdata *pd;
2043         struct ipath_devdata *dd;
2044         unsigned long flags;
2045         unsigned port;
2046         struct pid *pid;
2047
2048         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
2049                    (long)in->i_rdev, fp->private_data);
2050
2051         mutex_lock(&ipath_mutex);
2052
2053         fd = fp->private_data;
2054         fp->private_data = NULL;
2055         pd = fd->pd;
2056         if (!pd) {
2057                 mutex_unlock(&ipath_mutex);
2058                 goto bail;
2059         }
2060
2061         dd = pd->port_dd;
2062
2063         /* drain user sdma queue */
2064         ipath_user_sdma_queue_drain(dd, fd->pq);
2065         ipath_user_sdma_queue_destroy(fd->pq);
2066
2067         if (--pd->port_cnt) {
2068                 /*
2069                  * XXX If the master closes the port before the slave(s),
2070                  * revoke the mmap for the eager receive queue so
2071                  * the slave(s) don't wait for receive data forever.
2072                  */
2073                 pd->active_slaves &= ~(1 << fd->subport);
2074                 put_pid(pd->port_subpid[fd->subport]);
2075                 pd->port_subpid[fd->subport] = NULL;
2076                 mutex_unlock(&ipath_mutex);
2077                 goto bail;
2078         }
2079         /* early; no interrupt users after this */
2080         spin_lock_irqsave(&dd->ipath_uctxt_lock, flags);
2081         port = pd->port_port;
2082         dd->ipath_pd[port] = NULL;
2083         pid = pd->port_pid;
2084         pd->port_pid = NULL;
2085         spin_unlock_irqrestore(&dd->ipath_uctxt_lock, flags);
2086
2087         if (pd->port_rcvwait_to || pd->port_piowait_to
2088             || pd->port_rcvnowait || pd->port_pionowait) {
2089                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
2090                            "%u rcv %u, pio already\n",
2091                            pd->port_port, pd->port_rcvwait_to,
2092                            pd->port_piowait_to, pd->port_rcvnowait,
2093                            pd->port_pionowait);
2094                 pd->port_rcvwait_to = pd->port_piowait_to =
2095                         pd->port_rcvnowait = pd->port_pionowait = 0;
2096         }
2097         if (pd->port_flag) {
2098                 ipath_cdbg(PROC, "port %u port_flag set: 0x%lx\n",
2099                           pd->port_port, pd->port_flag);
2100                 pd->port_flag = 0;
2101         }
2102
2103         if (dd->ipath_kregbase) {
2104                 /* atomically clear receive enable port and intr avail. */
2105                 clear_bit(dd->ipath_r_portenable_shift + port,
2106                           &dd->ipath_rcvctrl);
2107                 clear_bit(pd->port_port + dd->ipath_r_intravail_shift,
2108                           &dd->ipath_rcvctrl);
2109                 ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
2110                         dd->ipath_rcvctrl);
2111                 /* and read back from chip to be sure that nothing
2112                  * else is in flight when we do the rest */
2113                 (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
2114
2115                 /* clean up the pkeys for this port user */
2116                 ipath_clean_part_key(pd, dd);
2117                 /*
2118                  * be paranoid, and never write 0's to these, just use an
2119                  * unused part of the port 0 tail page.  Of course,
2120                  * rcvhdraddr points to a large chunk of memory, so this
2121                  * could still trash things, but at least it won't trash
2122                  * page 0, and by disabling the port, it should stop "soon",
2123                  * even if a packet or two is in already in flight after we
2124                  * disabled the port.
2125                  */
2126                 ipath_write_kreg_port(dd,
2127                         dd->ipath_kregs->kr_rcvhdrtailaddr, port,
2128                         dd->ipath_dummy_hdrq_phys);
2129                 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
2130                         pd->port_port, dd->ipath_dummy_hdrq_phys);
2131
2132                 ipath_disarm_piobufs(dd, pd->port_pio_base, pd->port_piocnt);
2133                 ipath_chg_pioavailkernel(dd, pd->port_pio_base,
2134                         pd->port_piocnt, 1);
2135
2136                 dd->ipath_f_clear_tids(dd, pd->port_port);
2137
2138                 if (dd->ipath_pageshadow)
2139                         unlock_expected_tids(pd);
2140                 ipath_stats.sps_ports--;
2141                 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
2142                            pd->port_comm, pid_nr(pid),
2143                            dd->ipath_unit, port);
2144         }
2145
2146         put_pid(pid);
2147         mutex_unlock(&ipath_mutex);
2148         ipath_free_pddata(dd, pd); /* after releasing the mutex */
2149
2150 bail:
2151         kfree(fd);
2152         return ret;
2153 }
2154
2155 static int ipath_port_info(struct ipath_portdata *pd, u16 subport,
2156                            struct ipath_port_info __user *uinfo)
2157 {
2158         struct ipath_port_info info;
2159         int nup;
2160         int ret;
2161         size_t sz;
2162
2163         (void) ipath_count_units(NULL, &nup, NULL);
2164         info.num_active = nup;
2165         info.unit = pd->port_dd->ipath_unit;
2166         info.port = pd->port_port;
2167         info.subport = subport;
2168         /* Don't return new fields if old library opened the port. */
2169         if (ipath_supports_subports(pd->userversion >> 16,
2170                                     pd->userversion & 0xffff)) {
2171                 /* Number of user ports available for this device. */
2172                 info.num_ports = pd->port_dd->ipath_cfgports - 1;
2173                 info.num_subports = pd->port_subport_cnt;
2174                 sz = sizeof(info);
2175         } else
2176                 sz = sizeof(info) - 2 * sizeof(u16);
2177
2178         if (copy_to_user(uinfo, &info, sz)) {
2179                 ret = -EFAULT;
2180                 goto bail;
2181         }
2182         ret = 0;
2183
2184 bail:
2185         return ret;
2186 }
2187
2188 static int ipath_get_slave_info(struct ipath_portdata *pd,
2189                                 void __user *slave_mask_addr)
2190 {
2191         int ret = 0;
2192
2193         if (copy_to_user(slave_mask_addr, &pd->active_slaves, sizeof(u32)))
2194                 ret = -EFAULT;
2195         return ret;
2196 }
2197
2198 static int ipath_sdma_get_inflight(struct ipath_user_sdma_queue *pq,
2199                                    u32 __user *inflightp)
2200 {
2201         const u32 val = ipath_user_sdma_inflight_counter(pq);
2202
2203         if (put_user(val, inflightp))
2204                 return -EFAULT;
2205
2206         return 0;
2207 }
2208
2209 static int ipath_sdma_get_complete(struct ipath_devdata *dd,
2210                                    struct ipath_user_sdma_queue *pq,
2211                                    u32 __user *completep)
2212 {
2213         u32 val;
2214         int err;
2215
2216         err = ipath_user_sdma_make_progress(dd, pq);
2217         if (err < 0)
2218                 return err;
2219
2220         val = ipath_user_sdma_complete_counter(pq);
2221         if (put_user(val, completep))
2222                 return -EFAULT;
2223
2224         return 0;
2225 }
2226
2227 static ssize_t ipath_write(struct file *fp, const char __user *data,
2228                            size_t count, loff_t *off)
2229 {
2230         const struct ipath_cmd __user *ucmd;
2231         struct ipath_portdata *pd;
2232         const void __user *src;
2233         size_t consumed, copy;
2234         struct ipath_cmd cmd;
2235         ssize_t ret = 0;
2236         void *dest;
2237
2238         if (count < sizeof(cmd.type)) {
2239                 ret = -EINVAL;
2240                 goto bail;
2241         }
2242
2243         ucmd = (const struct ipath_cmd __user *) data;
2244
2245         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
2246                 ret = -EFAULT;
2247                 goto bail;
2248         }
2249
2250         consumed = sizeof(cmd.type);
2251
2252         switch (cmd.type) {
2253         case IPATH_CMD_ASSIGN_PORT:
2254         case __IPATH_CMD_USER_INIT:
2255         case IPATH_CMD_USER_INIT:
2256                 copy = sizeof(cmd.cmd.user_info);
2257                 dest = &cmd.cmd.user_info;
2258                 src = &ucmd->cmd.user_info;
2259                 break;
2260         case IPATH_CMD_RECV_CTRL:
2261                 copy = sizeof(cmd.cmd.recv_ctrl);
2262                 dest = &cmd.cmd.recv_ctrl;
2263                 src = &ucmd->cmd.recv_ctrl;
2264                 break;
2265         case IPATH_CMD_PORT_INFO:
2266                 copy = sizeof(cmd.cmd.port_info);
2267                 dest = &cmd.cmd.port_info;
2268                 src = &ucmd->cmd.port_info;
2269                 break;
2270         case IPATH_CMD_TID_UPDATE:
2271         case IPATH_CMD_TID_FREE:
2272                 copy = sizeof(cmd.cmd.tid_info);
2273                 dest = &cmd.cmd.tid_info;
2274                 src = &ucmd->cmd.tid_info;
2275                 break;
2276         case IPATH_CMD_SET_PART_KEY:
2277                 copy = sizeof(cmd.cmd.part_key);
2278                 dest = &cmd.cmd.part_key;
2279                 src = &ucmd->cmd.part_key;
2280                 break;
2281         case __IPATH_CMD_SLAVE_INFO:
2282                 copy = sizeof(cmd.cmd.slave_mask_addr);
2283                 dest = &cmd.cmd.slave_mask_addr;
2284                 src = &ucmd->cmd.slave_mask_addr;
2285                 break;
2286         case IPATH_CMD_PIOAVAILUPD:     // force an update of PIOAvail reg
2287                 copy = 0;
2288                 src = NULL;
2289                 dest = NULL;
2290                 break;
2291         case IPATH_CMD_POLL_TYPE:
2292                 copy = sizeof(cmd.cmd.poll_type);
2293                 dest = &cmd.cmd.poll_type;
2294                 src = &ucmd->cmd.poll_type;
2295                 break;
2296         case IPATH_CMD_ARMLAUNCH_CTRL:
2297                 copy = sizeof(cmd.cmd.armlaunch_ctrl);
2298                 dest = &cmd.cmd.armlaunch_ctrl;
2299                 src = &ucmd->cmd.armlaunch_ctrl;
2300                 break;
2301         case IPATH_CMD_SDMA_INFLIGHT:
2302                 copy = sizeof(cmd.cmd.sdma_inflight);
2303                 dest = &cmd.cmd.sdma_inflight;
2304                 src = &ucmd->cmd.sdma_inflight;
2305                 break;
2306         case IPATH_CMD_SDMA_COMPLETE:
2307                 copy = sizeof(cmd.cmd.sdma_complete);
2308                 dest = &cmd.cmd.sdma_complete;
2309                 src = &ucmd->cmd.sdma_complete;
2310                 break;
2311         default:
2312                 ret = -EINVAL;
2313                 goto bail;
2314         }
2315
2316         if (copy) {
2317                 if ((count - consumed) < copy) {
2318                         ret = -EINVAL;
2319                         goto bail;
2320                 }
2321
2322                 if (copy_from_user(dest, src, copy)) {
2323                         ret = -EFAULT;
2324                         goto bail;
2325                 }
2326
2327                 consumed += copy;
2328         }
2329
2330         pd = port_fp(fp);
2331         if (!pd && cmd.type != __IPATH_CMD_USER_INIT &&
2332                 cmd.type != IPATH_CMD_ASSIGN_PORT) {
2333                 ret = -EINVAL;
2334                 goto bail;
2335         }
2336
2337         switch (cmd.type) {
2338         case IPATH_CMD_ASSIGN_PORT:
2339                 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2340                 if (ret)
2341                         goto bail;
2342                 break;
2343         case __IPATH_CMD_USER_INIT:
2344                 /* backwards compatibility, get port first */
2345                 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2346                 if (ret)
2347                         goto bail;
2348                 /* and fall through to current version. */
2349         case IPATH_CMD_USER_INIT:
2350                 ret = ipath_do_user_init(fp, &cmd.cmd.user_info);
2351                 if (ret)
2352                         goto bail;
2353                 ret = ipath_get_base_info(
2354                         fp, (void __user *) (unsigned long)
2355                         cmd.cmd.user_info.spu_base_info,
2356                         cmd.cmd.user_info.spu_base_info_size);
2357                 break;
2358         case IPATH_CMD_RECV_CTRL:
2359                 ret = ipath_manage_rcvq(pd, subport_fp(fp), cmd.cmd.recv_ctrl);
2360                 break;
2361         case IPATH_CMD_PORT_INFO:
2362                 ret = ipath_port_info(pd, subport_fp(fp),
2363                                       (struct ipath_port_info __user *)
2364                                       (unsigned long) cmd.cmd.port_info);
2365                 break;
2366         case IPATH_CMD_TID_UPDATE:
2367                 ret = ipath_tid_update(pd, fp, &cmd.cmd.tid_info);
2368                 break;
2369         case IPATH_CMD_TID_FREE:
2370                 ret = ipath_tid_free(pd, subport_fp(fp), &cmd.cmd.tid_info);
2371                 break;
2372         case IPATH_CMD_SET_PART_KEY:
2373                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
2374                 break;
2375         case __IPATH_CMD_SLAVE_INFO:
2376                 ret = ipath_get_slave_info(pd,
2377                                            (void __user *) (unsigned long)
2378                                            cmd.cmd.slave_mask_addr);
2379                 break;
2380         case IPATH_CMD_PIOAVAILUPD:
2381                 ipath_force_pio_avail_update(pd->port_dd);
2382                 break;
2383         case IPATH_CMD_POLL_TYPE:
2384                 pd->poll_type = cmd.cmd.poll_type;
2385                 break;
2386         case IPATH_CMD_ARMLAUNCH_CTRL:
2387                 if (cmd.cmd.armlaunch_ctrl)
2388                         ipath_enable_armlaunch(pd->port_dd);
2389                 else
2390                         ipath_disable_armlaunch(pd->port_dd);
2391                 break;
2392         case IPATH_CMD_SDMA_INFLIGHT:
2393                 ret = ipath_sdma_get_inflight(user_sdma_queue_fp(fp),
2394                                               (u32 __user *) (unsigned long)
2395                                               cmd.cmd.sdma_inflight);
2396                 break;
2397         case IPATH_CMD_SDMA_COMPLETE:
2398                 ret = ipath_sdma_get_complete(pd->port_dd,
2399                                               user_sdma_queue_fp(fp),
2400                                               (u32 __user *) (unsigned long)
2401                                               cmd.cmd.sdma_complete);
2402                 break;
2403         }
2404
2405         if (ret >= 0)
2406                 ret = consumed;
2407
2408 bail:
2409         return ret;
2410 }
2411
2412 static ssize_t ipath_writev(struct kiocb *iocb, const struct iovec *iov,
2413                             unsigned long dim, loff_t off)
2414 {
2415         struct file *filp = iocb->ki_filp;
2416         struct ipath_filedata *fp = filp->private_data;
2417         struct ipath_portdata *pd = port_fp(filp);
2418         struct ipath_user_sdma_queue *pq = fp->pq;
2419
2420         if (!dim)
2421                 return -EINVAL;
2422
2423         return ipath_user_sdma_writev(pd->port_dd, pq, iov, dim);
2424 }
2425
2426 static struct class *ipath_class;
2427
2428 static int init_cdev(int minor, char *name, const struct file_operations *fops,
2429                      struct cdev **cdevp, struct device **devp)
2430 {
2431         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
2432         struct cdev *cdev = NULL;
2433         struct device *device = NULL;
2434         int ret;
2435
2436         cdev = cdev_alloc();
2437         if (!cdev) {
2438                 printk(KERN_ERR IPATH_DRV_NAME
2439                        ": Could not allocate cdev for minor %d, %s\n",
2440                        minor, name);
2441                 ret = -ENOMEM;
2442                 goto done;
2443         }
2444
2445         cdev->owner = THIS_MODULE;
2446         cdev->ops = fops;
2447         kobject_set_name(&cdev->kobj, name);
2448
2449         ret = cdev_add(cdev, dev, 1);
2450         if (ret < 0) {
2451                 printk(KERN_ERR IPATH_DRV_NAME
2452                        ": Could not add cdev for minor %d, %s (err %d)\n",
2453                        minor, name, -ret);
2454                 goto err_cdev;
2455         }
2456
2457         device = device_create(ipath_class, NULL, dev, NULL, name);
2458
2459         if (IS_ERR(device)) {
2460                 ret = PTR_ERR(device);
2461                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2462                        "device for minor %d, %s (err %d)\n",
2463                        minor, name, -ret);
2464                 goto err_cdev;
2465         }
2466
2467         goto done;
2468
2469 err_cdev:
2470         cdev_del(cdev);
2471         cdev = NULL;
2472
2473 done:
2474         if (ret >= 0) {
2475                 *cdevp = cdev;
2476                 *devp = device;
2477         } else {
2478                 *cdevp = NULL;
2479                 *devp = NULL;
2480         }
2481
2482         return ret;
2483 }
2484
2485 int ipath_cdev_init(int minor, char *name, const struct file_operations *fops,
2486                     struct cdev **cdevp, struct device **devp)
2487 {
2488         return init_cdev(minor, name, fops, cdevp, devp);
2489 }
2490
2491 static void cleanup_cdev(struct cdev **cdevp,
2492                          struct device **devp)
2493 {
2494         struct device *dev = *devp;
2495
2496         if (dev) {
2497                 device_unregister(dev);
2498                 *devp = NULL;
2499         }
2500
2501         if (*cdevp) {
2502                 cdev_del(*cdevp);
2503                 *cdevp = NULL;
2504         }
2505 }
2506
2507 void ipath_cdev_cleanup(struct cdev **cdevp,
2508                         struct device **devp)
2509 {
2510         cleanup_cdev(cdevp, devp);
2511 }
2512
2513 static struct cdev *wildcard_cdev;
2514 static struct device *wildcard_dev;
2515
2516 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
2517
2518 static int user_init(void)
2519 {
2520         int ret;
2521
2522         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
2523         if (ret < 0) {
2524                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
2525                        "chrdev region (err %d)\n", -ret);
2526                 goto done;
2527         }
2528
2529         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
2530
2531         if (IS_ERR(ipath_class)) {
2532                 ret = PTR_ERR(ipath_class);
2533                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2534                        "device class (err %d)\n", -ret);
2535                 goto bail;
2536         }
2537
2538         goto done;
2539 bail:
2540         unregister_chrdev_region(dev, IPATH_NMINORS);
2541 done:
2542         return ret;
2543 }
2544
2545 static void user_cleanup(void)
2546 {
2547         if (ipath_class) {
2548                 class_destroy(ipath_class);
2549                 ipath_class = NULL;
2550         }
2551
2552         unregister_chrdev_region(dev, IPATH_NMINORS);
2553 }
2554
2555 static atomic_t user_count = ATOMIC_INIT(0);
2556 static atomic_t user_setup = ATOMIC_INIT(0);
2557
2558 int ipath_user_add(struct ipath_devdata *dd)
2559 {
2560         char name[10];
2561         int ret;
2562
2563         if (atomic_inc_return(&user_count) == 1) {
2564                 ret = user_init();
2565                 if (ret < 0) {
2566                         ipath_dev_err(dd, "Unable to set up user support: "
2567                                       "error %d\n", -ret);
2568                         goto bail;
2569                 }
2570                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
2571                                 &wildcard_dev);
2572                 if (ret < 0) {
2573                         ipath_dev_err(dd, "Could not create wildcard "
2574                                       "minor: error %d\n", -ret);
2575                         goto bail_user;
2576                 }
2577
2578                 atomic_set(&user_setup, 1);
2579         }
2580
2581         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
2582
2583         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
2584                         &dd->user_cdev, &dd->user_dev);
2585         if (ret < 0)
2586                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
2587                               dd->ipath_unit + 1, name);
2588
2589         goto bail;
2590
2591 bail_user:
2592         user_cleanup();
2593 bail:
2594         return ret;
2595 }
2596
2597 void ipath_user_remove(struct ipath_devdata *dd)
2598 {
2599         cleanup_cdev(&dd->user_cdev, &dd->user_dev);
2600
2601         if (atomic_dec_return(&user_count) == 0) {
2602                 if (atomic_read(&user_setup) == 0)
2603                         goto bail;
2604
2605                 cleanup_cdev(&wildcard_cdev, &wildcard_dev);
2606                 user_cleanup();
2607
2608                 atomic_set(&user_setup, 0);
2609         }
2610 bail:
2611         return;
2612 }