drivers/infiniband/hw/qib/qib_file_ops.c

   1 /*
   2  * Copyright (c) 2012, 2013 Intel Corporation. All rights reserved.
   3  * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
   4  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/pci.h>
  36 #include <linux/poll.h>
  37 #include <linux/cdev.h>
  38 #include <linux/swap.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/highmem.h>
  41 #include <linux/io.h>
  42 #include <linux/jiffies.h>
  43 #include <asm/pgtable.h>
  44 #include <linux/delay.h>
  45 #include <linux/export.h>
  46 #include <linux/uio.h>
  47
  48 #include <rdma/ib.h>
  49
  50 #include "qib.h"
  51 #include "qib_common.h"
  52 #include "qib_user_sdma.h"
  53
  54 #undef pr_fmt
  55 #define pr_fmt(fmt) QIB_DRV_NAME ": " fmt
  56
  57 static int qib_open(struct inode *, struct file *);
  58 static int qib_close(struct inode *, struct file *);
  59 static ssize_t qib_write(struct file *, const char __user *, size_t, loff_t *);
  60 static ssize_t qib_write_iter(struct kiocb *, struct iov_iter *);
  61 static unsigned int qib_poll(struct file *, struct poll_table_struct *);
  62 static int qib_mmapf(struct file *, struct vm_area_struct *);
  63
  64 /*
  65  * This is really, really weird shit - write() and writev() here
  66  * have completely unrelated semantics.  Sucky userland ABI,
  67  * film at 11.
  68  */
  69 static const struct file_operations qib_file_ops = {
  70         .owner = THIS_MODULE,
  71         .write = qib_write,
  72         .write_iter = qib_write_iter,
  73         .open = qib_open,
  74         .release = qib_close,
  75         .poll = qib_poll,
  76         .mmap = qib_mmapf,
  77         .llseek = noop_llseek,
  78 };
  79
  80 /*
  81  * Convert kernel virtual addresses to physical addresses so they don't
  82  * potentially conflict with the chip addresses used as mmap offsets.
  83  * It doesn't really matter what mmap offset we use as long as we can
  84  * interpret it correctly.
  85  */
  86 static u64 cvt_kvaddr(void *p)
  87 {
  88         struct page *page;
  89         u64 paddr = 0;
  90
  91         page = vmalloc_to_page(p);
  92         if (page)
  93                 paddr = page_to_pfn(page) << PAGE_SHIFT;
  94
  95         return paddr;
  96 }
  97
  98 static int qib_get_base_info(struct file *fp, void __user *ubase,
  99                              size_t ubase_size)
 100 {
 101         struct qib_ctxtdata *rcd = ctxt_fp(fp);
 102         int ret = 0;
 103         struct qib_base_info *kinfo = NULL;
 104         struct qib_devdata *dd = rcd->dd;
 105         struct qib_pportdata *ppd = rcd->ppd;
 106         unsigned subctxt_cnt;
 107         int shared, master;
 108         size_t sz;
 109
 110         subctxt_cnt = rcd->subctxt_cnt;
 111         if (!subctxt_cnt) {
 112                 shared = 0;
 113                 master = 0;
 114                 subctxt_cnt = 1;
 115         } else {
 116                 shared = 1;
 117                 master = !subctxt_fp(fp);
 118         }
 119
 120         sz = sizeof(*kinfo);
 121         /* If context sharing is not requested, allow the old size structure */
 122         if (!shared)
 123                 sz -= 7 * sizeof(u64);
 124         if (ubase_size < sz) {
 125                 ret = -EINVAL;
 126                 goto bail;
 127         }
 128
 129         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
 130         if (kinfo == NULL) {
 131                 ret = -ENOMEM;
 132                 goto bail;
 133         }
 134
 135         ret = dd->f_get_base_info(rcd, kinfo);
 136         if (ret < 0)
 137                 goto bail;
 138
 139         kinfo->spi_rcvhdr_cnt = dd->rcvhdrcnt;
 140         kinfo->spi_rcvhdrent_size = dd->rcvhdrentsize;
 141         kinfo->spi_tidegrcnt = rcd->rcvegrcnt;
 142         kinfo->spi_rcv_egrbufsize = dd->rcvegrbufsize;
 143         /*
 144          * have to mmap whole thing
 145          */
 146         kinfo->spi_rcv_egrbuftotlen =
 147                 rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size;
 148         kinfo->spi_rcv_egrperchunk = rcd->rcvegrbufs_perchunk;
 149         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
 150                 rcd->rcvegrbuf_chunks;
 151         kinfo->spi_tidcnt = dd->rcvtidcnt / subctxt_cnt;
 152         if (master)
 153                 kinfo->spi_tidcnt += dd->rcvtidcnt % subctxt_cnt;
 154         /*
 155          * for this use, may be cfgctxts summed over all chips that
 156          * are are configured and present
 157          */
 158         kinfo->spi_nctxts = dd->cfgctxts;
 159         /* unit (chip/board) our context is on */
 160         kinfo->spi_unit = dd->unit;
 161         kinfo->spi_port = ppd->port;
 162         /* for now, only a single page */
 163         kinfo->spi_tid_maxsize = PAGE_SIZE;
 164
 165         /*
 166          * Doing this per context, and based on the skip value, etc.  This has
 167          * to be the actual buffer size, since the protocol code treats it
 168          * as an array.
 169          *
 170          * These have to be set to user addresses in the user code via mmap.
 171          * These values are used on return to user code for the mmap target
 172          * addresses only.  For 32 bit, same 44 bit address problem, so use
 173          * the physical address, not virtual.  Before 2.6.11, using the
 174          * page_address() macro worked, but in 2.6.11, even that returns the
 175          * full 64 bit address (upper bits all 1's).  So far, using the
 176          * physical addresses (or chip offsets, for chip mapping) works, but
 177          * no doubt some future kernel release will change that, and we'll be
 178          * on to yet another method of dealing with this.
 179          * Normally only one of rcvhdr_tailaddr or rhf_offset is useful
 180          * since the chips with non-zero rhf_offset don't normally
 181          * enable tail register updates to host memory, but for testing,
 182          * both can be enabled and used.
 183          */
 184         kinfo->spi_rcvhdr_base = (u64) rcd->rcvhdrq_phys;
 185         kinfo->spi_rcvhdr_tailaddr = (u64) rcd->rcvhdrqtailaddr_phys;
 186         kinfo->spi_rhf_offset = dd->rhf_offset;
 187         kinfo->spi_rcv_egrbufs = (u64) rcd->rcvegr_phys;
 188         kinfo->spi_pioavailaddr = (u64) dd->pioavailregs_phys;
 189         /* setup per-unit (not port) status area for user programs */
 190         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
 191                 (char *) ppd->statusp -
 192                 (char *) dd->pioavailregs_dma;
 193         kinfo->spi_uregbase = (u64) dd->uregbase + dd->ureg_align * rcd->ctxt;
 194         if (!shared) {
 195                 kinfo->spi_piocnt = rcd->piocnt;
 196                 kinfo->spi_piobufbase = (u64) rcd->piobufs;
 197                 kinfo->spi_sendbuf_status = cvt_kvaddr(rcd->user_event_mask);
 198         } else if (master) {
 199                 kinfo->spi_piocnt = (rcd->piocnt / subctxt_cnt) +
 200                                     (rcd->piocnt % subctxt_cnt);
 201                 /* Master's PIO buffers are after all the slave's */
 202                 kinfo->spi_piobufbase = (u64) rcd->piobufs +
 203                         dd->palign *
 204                         (rcd->piocnt - kinfo->spi_piocnt);
 205         } else {
 206                 unsigned slave = subctxt_fp(fp) - 1;
 207
 208                 kinfo->spi_piocnt = rcd->piocnt / subctxt_cnt;
 209                 kinfo->spi_piobufbase = (u64) rcd->piobufs +
 210                         dd->palign * kinfo->spi_piocnt * slave;
 211         }
 212
 213         if (shared) {
 214                 kinfo->spi_sendbuf_status =
 215                         cvt_kvaddr(&rcd->user_event_mask[subctxt_fp(fp)]);
 216                 /* only spi_subctxt_* fields should be set in this block! */
 217                 kinfo->spi_subctxt_uregbase = cvt_kvaddr(rcd->subctxt_uregbase);
 218
 219                 kinfo->spi_subctxt_rcvegrbuf =
 220                         cvt_kvaddr(rcd->subctxt_rcvegrbuf);
 221                 kinfo->spi_subctxt_rcvhdr_base =
 222                         cvt_kvaddr(rcd->subctxt_rcvhdr_base);
 223         }
 224
 225         /*
 226          * All user buffers are 2KB buffers.  If we ever support
 227          * giving 4KB buffers to user processes, this will need some
 228          * work.  Can't use piobufbase directly, because it has
 229          * both 2K and 4K buffer base values.
 230          */
 231         kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->pio2k_bufbase) /
 232                 dd->palign;
 233         kinfo->spi_pioalign = dd->palign;
 234         kinfo->spi_qpair = QIB_KD_QP;
 235         /*
 236          * user mode PIO buffers are always 2KB, even when 4KB can
 237          * be received, and sent via the kernel; this is ibmaxlen
 238          * for 2K MTU.
 239          */
 240         kinfo->spi_piosize = dd->piosize2k - 2 * sizeof(u32);
 241         kinfo->spi_mtu = ppd->ibmaxlen; /* maxlen, not ibmtu */
 242         kinfo->spi_ctxt = rcd->ctxt;
 243         kinfo->spi_subctxt = subctxt_fp(fp);
 244         kinfo->spi_sw_version = QIB_KERN_SWVERSION;
 245         kinfo->spi_sw_version |= 1U << 31; /* QLogic-built, not kernel.org */
 246         kinfo->spi_hw_version = dd->revision;
 247
 248         if (master)
 249                 kinfo->spi_runtime_flags |= QIB_RUNTIME_MASTER;
 250
 251         sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
 252         if (copy_to_user(ubase, kinfo, sz))
 253                 ret = -EFAULT;
 254 bail:
 255         kfree(kinfo);
 256         return ret;
 257 }
 258
 259 /**
 260  * qib_tid_update - update a context TID
 261  * @rcd: the context
 262  * @fp: the qib device file
 263  * @ti: the TID information
 264  *
 265  * The new implementation as of Oct 2004 is that the driver assigns
 266  * the tid and returns it to the caller.   To reduce search time, we
 267  * keep a cursor for each context, walking the shadow tid array to find
 268  * one that's not in use.
 269  *
 270  * For now, if we can't allocate the full list, we fail, although
 271  * in the long run, we'll allocate as many as we can, and the
 272  * caller will deal with that by trying the remaining pages later.
 273  * That means that when we fail, we have to mark the tids as not in
 274  * use again, in our shadow copy.
 275  *
 276  * It's up to the caller to free the tids when they are done.
 277  * We'll unlock the pages as they free them.
 278  *
 279  * Also, right now we are locking one page at a time, but since
 280  * the intended use of this routine is for a single group of
 281  * virtually contiguous pages, that should change to improve
 282  * performance.
 283  */
 284 static int qib_tid_update(struct qib_ctxtdata *rcd, struct file *fp,
 285                           const struct qib_tid_info *ti)
 286 {
 287         int ret = 0, ntids;
 288         u32 tid, ctxttid, cnt, i, tidcnt, tidoff;
 289         u16 *tidlist;
 290         struct qib_devdata *dd = rcd->dd;
 291         u64 physaddr;
 292         unsigned long vaddr;
 293         u64 __iomem *tidbase;
 294         unsigned long tidmap[8];
 295         struct page **pagep = NULL;
 296         unsigned subctxt = subctxt_fp(fp);
 297
 298         if (!dd->pageshadow) {
 299                 ret = -ENOMEM;
 300                 goto done;
 301         }
 302
 303         cnt = ti->tidcnt;
 304         if (!cnt) {
 305                 ret = -EFAULT;
 306                 goto done;
 307         }
 308         ctxttid = rcd->ctxt * dd->rcvtidcnt;
 309         if (!rcd->subctxt_cnt) {
 310                 tidcnt = dd->rcvtidcnt;
 311                 tid = rcd->tidcursor;
 312                 tidoff = 0;
 313         } else if (!subctxt) {
 314                 tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) +
 315                          (dd->rcvtidcnt % rcd->subctxt_cnt);
 316                 tidoff = dd->rcvtidcnt - tidcnt;
 317                 ctxttid += tidoff;
 318                 tid = tidcursor_fp(fp);
 319         } else {
 320                 tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt;
 321                 tidoff = tidcnt * (subctxt - 1);
 322                 ctxttid += tidoff;
 323                 tid = tidcursor_fp(fp);
 324         }
 325         if (cnt > tidcnt) {
 326                 /* make sure it all fits in tid_pg_list */
 327                 qib_devinfo(dd->pcidev,
 328                         "Process tried to allocate %u TIDs, only trying max (%u)\n",
 329                         cnt, tidcnt);
 330                 cnt = tidcnt;
 331         }
 332         pagep = (struct page **) rcd->tid_pg_list;
 333         tidlist = (u16 *) &pagep[dd->rcvtidcnt];
 334         pagep += tidoff;
 335         tidlist += tidoff;
 336
 337         memset(tidmap, 0, sizeof(tidmap));
 338         /* before decrement; chip actual # */
 339         ntids = tidcnt;
 340         tidbase = (u64 __iomem *) (((char __iomem *) dd->kregbase) +
 341                                    dd->rcvtidbase +
 342                                    ctxttid * sizeof(*tidbase));
 343
 344         /* virtual address of first page in transfer */
 345         vaddr = ti->tidvaddr;
 346         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
 347                        cnt * PAGE_SIZE)) {
 348                 ret = -EFAULT;
 349                 goto done;
 350         }
 351         ret = qib_get_user_pages(vaddr, cnt, pagep);
 352         if (ret) {
 353                 /*
 354                  * if (ret == -EBUSY)
 355                  * We can't continue because the pagep array won't be
 356                  * initialized. This should never happen,
 357                  * unless perhaps the user has mpin'ed the pages
 358                  * themselves.
 359                  */
 360                 qib_devinfo(
 361                         dd->pcidev,
 362                         "Failed to lock addr %p, %u pages: errno %d\n",
 363                         (void *) vaddr, cnt, -ret);
 364                 goto done;
 365         }
 366         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
 367                 for (; ntids--; tid++) {
 368                         if (tid == tidcnt)
 369                                 tid = 0;
 370                         if (!dd->pageshadow[ctxttid + tid])
 371                                 break;
 372                 }
 373                 if (ntids < 0) {
 374                         /*
 375                          * Oops, wrapped all the way through their TIDs,
 376                          * and didn't have enough free; see comments at
 377                          * start of routine
 378                          */
 379                         i--;    /* last tidlist[i] not filled in */
 380                         ret = -ENOMEM;
 381                         break;
 382                 }
 383                 tidlist[i] = tid + tidoff;
 384                 /* we "know" system pages and TID pages are same size */
 385                 dd->pageshadow[ctxttid + tid] = pagep[i];
 386                 dd->physshadow[ctxttid + tid] =
 387                         qib_map_page(dd->pcidev, pagep[i], 0, PAGE_SIZE,
 388                                      PCI_DMA_FROMDEVICE);
 389                 /*
 390                  * don't need atomic or it's overhead
 391                  */
 392                 __set_bit(tid, tidmap);
 393                 physaddr = dd->physshadow[ctxttid + tid];
 394                 /* PERFORMANCE: below should almost certainly be cached */
 395                 dd->f_put_tid(dd, &tidbase[tid],
 396                                   RCVHQ_RCV_TYPE_EXPECTED, physaddr);
 397                 /*
 398                  * don't check this tid in qib_ctxtshadow, since we
 399                  * just filled it in; start with the next one.
 400                  */
 401                 tid++;
 402         }
 403
 404         if (ret) {
 405                 u32 limit;
 406 cleanup:
 407                 /* jump here if copy out of updated info failed... */
 408                 /* same code that's in qib_free_tid() */
 409                 limit = sizeof(tidmap) * BITS_PER_BYTE;
 410                 if (limit > tidcnt)
 411                         /* just in case size changes in future */
 412                         limit = tidcnt;
 413                 tid = find_first_bit((const unsigned long *)tidmap, limit);
 414                 for (; tid < limit; tid++) {
 415                         if (!test_bit(tid, tidmap))
 416                                 continue;
 417                         if (dd->pageshadow[ctxttid + tid]) {
 418                                 dma_addr_t phys;
 419
 420                                 phys = dd->physshadow[ctxttid + tid];
 421                                 dd->physshadow[ctxttid + tid] = dd->tidinvalid;
 422                                 /* PERFORMANCE: below should almost certainly
 423                                  * be cached
 424                                  */
 425                                 dd->f_put_tid(dd, &tidbase[tid],
 426                                               RCVHQ_RCV_TYPE_EXPECTED,
 427                                               dd->tidinvalid);
 428                                 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
 429                                                PCI_DMA_FROMDEVICE);
 430                                 dd->pageshadow[ctxttid + tid] = NULL;
 431                         }
 432                 }
 433                 qib_release_user_pages(pagep, cnt);
 434         } else {
 435                 /*
 436                  * Copy the updated array, with qib_tid's filled in, back
 437                  * to user.  Since we did the copy in already, this "should
 438                  * never fail" If it does, we have to clean up...
 439                  */
 440                 if (copy_to_user((void __user *)
 441                                  (unsigned long) ti->tidlist,
 442                                  tidlist, cnt * sizeof(*tidlist))) {
 443                         ret = -EFAULT;
 444                         goto cleanup;
 445                 }
 446                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
 447                                  tidmap, sizeof(tidmap))) {
 448                         ret = -EFAULT;
 449                         goto cleanup;
 450                 }
 451                 if (tid == tidcnt)
 452                         tid = 0;
 453                 if (!rcd->subctxt_cnt)
 454                         rcd->tidcursor = tid;
 455                 else
 456                         tidcursor_fp(fp) = tid;
 457         }
 458
 459 done:
 460         return ret;
 461 }
 462
 463 /**
 464  * qib_tid_free - free a context TID
 465  * @rcd: the context
 466  * @subctxt: the subcontext
 467  * @ti: the TID info
 468  *
 469  * right now we are unlocking one page at a time, but since
 470  * the intended use of this routine is for a single group of
 471  * virtually contiguous pages, that should change to improve
 472  * performance.  We check that the TID is in range for this context
 473  * but otherwise don't check validity; if user has an error and
 474  * frees the wrong tid, it's only their own data that can thereby
 475  * be corrupted.  We do check that the TID was in use, for sanity
 476  * We always use our idea of the saved address, not the address that
 477  * they pass in to us.
 478  */
 479 static int qib_tid_free(struct qib_ctxtdata *rcd, unsigned subctxt,
 480                         const struct qib_tid_info *ti)
 481 {
 482         int ret = 0;
 483         u32 tid, ctxttid, cnt, limit, tidcnt;
 484         struct qib_devdata *dd = rcd->dd;
 485         u64 __iomem *tidbase;
 486         unsigned long tidmap[8];
 487
 488         if (!dd->pageshadow) {
 489                 ret = -ENOMEM;
 490                 goto done;
 491         }
 492
 493         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
 494                            sizeof(tidmap))) {
 495                 ret = -EFAULT;
 496                 goto done;
 497         }
 498
 499         ctxttid = rcd->ctxt * dd->rcvtidcnt;
 500         if (!rcd->subctxt_cnt)
 501                 tidcnt = dd->rcvtidcnt;
 502         else if (!subctxt) {
 503                 tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) +
 504                          (dd->rcvtidcnt % rcd->subctxt_cnt);
 505                 ctxttid += dd->rcvtidcnt - tidcnt;
 506         } else {
 507                 tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt;
 508                 ctxttid += tidcnt * (subctxt - 1);
 509         }
 510         tidbase = (u64 __iomem *) ((char __iomem *)(dd->kregbase) +
 511                                    dd->rcvtidbase +
 512                                    ctxttid * sizeof(*tidbase));
 513
 514         limit = sizeof(tidmap) * BITS_PER_BYTE;
 515         if (limit > tidcnt)
 516                 /* just in case size changes in future */
 517                 limit = tidcnt;
 518         tid = find_first_bit(tidmap, limit);
 519         for (cnt = 0; tid < limit; tid++) {
 520                 /*
 521                  * small optimization; if we detect a run of 3 or so without
 522                  * any set, use find_first_bit again.  That's mainly to
 523                  * accelerate the case where we wrapped, so we have some at
 524                  * the beginning, and some at the end, and a big gap
 525                  * in the middle.
 526                  */
 527                 if (!test_bit(tid, tidmap))
 528                         continue;
 529                 cnt++;
 530                 if (dd->pageshadow[ctxttid + tid]) {
 531                         struct page *p;
 532                         dma_addr_t phys;
 533
 534                         p = dd->pageshadow[ctxttid + tid];
 535                         dd->pageshadow[ctxttid + tid] = NULL;
 536                         phys = dd->physshadow[ctxttid + tid];
 537                         dd->physshadow[ctxttid + tid] = dd->tidinvalid;
 538                         /* PERFORMANCE: below should almost certainly be
 539                          * cached
 540                          */
 541                         dd->f_put_tid(dd, &tidbase[tid],
 542                                       RCVHQ_RCV_TYPE_EXPECTED, dd->tidinvalid);
 543                         pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
 544                                        PCI_DMA_FROMDEVICE);
 545                         qib_release_user_pages(&p, 1);
 546                 }
 547         }
 548 done:
 549         return ret;
 550 }
 551
 552 /**
 553  * qib_set_part_key - set a partition key
 554  * @rcd: the context
 555  * @key: the key
 556  *
 557  * We can have up to 4 active at a time (other than the default, which is
 558  * always allowed).  This is somewhat tricky, since multiple contexts may set
 559  * the same key, so we reference count them, and clean up at exit.  All 4
 560  * partition keys are packed into a single qlogic_ib register.  It's an
 561  * error for a process to set the same pkey multiple times.  We provide no
 562  * mechanism to de-allocate a pkey at this time, we may eventually need to
 563  * do that.  I've used the atomic operations, and no locking, and only make
 564  * a single pass through what's available.  This should be more than
 565  * adequate for some time. I'll think about spinlocks or the like if and as
 566  * it's necessary.
 567  */
 568 static int qib_set_part_key(struct qib_ctxtdata *rcd, u16 key)
 569 {
 570         struct qib_pportdata *ppd = rcd->ppd;
 571         int i, any = 0, pidx = -1;
 572         u16 lkey = key & 0x7FFF;
 573         int ret;
 574
 575         if (lkey == (QIB_DEFAULT_P_KEY & 0x7FFF)) {
 576                 /* nothing to do; this key always valid */
 577                 ret = 0;
 578                 goto bail;
 579         }
 580
 581         if (!lkey) {
 582                 ret = -EINVAL;
 583                 goto bail;
 584         }
 585
 586         /*
 587          * Set the full membership bit, because it has to be
 588          * set in the register or the packet, and it seems
 589          * cleaner to set in the register than to force all
 590          * callers to set it.
 591          */
 592         key |= 0x8000;
 593
 594         for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
 595                 if (!rcd->pkeys[i] && pidx == -1)
 596                         pidx = i;
 597                 if (rcd->pkeys[i] == key) {
 598                         ret = -EEXIST;
 599                         goto bail;
 600                 }
 601         }
 602         if (pidx == -1) {
 603                 ret = -EBUSY;
 604                 goto bail;
 605         }
 606         for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
 607                 if (!ppd->pkeys[i]) {
 608                         any++;
 609                         continue;
 610                 }
 611                 if (ppd->pkeys[i] == key) {
 612                         atomic_t *pkrefs = &ppd->pkeyrefs[i];
 613
 614                         if (atomic_inc_return(pkrefs) > 1) {
 615                                 rcd->pkeys[pidx] = key;
 616                                 ret = 0;
 617                                 goto bail;
 618                         } else {
 619                                 /*
 620                                  * lost race, decrement count, catch below
 621                                  */
 622                                 atomic_dec(pkrefs);
 623                                 any++;
 624                         }
 625                 }
 626                 if ((ppd->pkeys[i] & 0x7FFF) == lkey) {
 627                         /*
 628                          * It makes no sense to have both the limited and
 629                          * full membership PKEY set at the same time since
 630                          * the unlimited one will disable the limited one.
 631                          */
 632                         ret = -EEXIST;
 633                         goto bail;
 634                 }
 635         }
 636         if (!any) {
 637                 ret = -EBUSY;
 638                 goto bail;
 639         }
 640         for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
 641                 if (!ppd->pkeys[i] &&
 642                     atomic_inc_return(&ppd->pkeyrefs[i]) == 1) {
 643                         rcd->pkeys[pidx] = key;
 644                         ppd->pkeys[i] = key;
 645                         (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);
 646                         ret = 0;
 647                         goto bail;
 648                 }
 649         }
 650         ret = -EBUSY;
 651
 652 bail:
 653         return ret;
 654 }
 655
 656 /**
 657  * qib_manage_rcvq - manage a context's receive queue
 658  * @rcd: the context
 659  * @subctxt: the subcontext
 660  * @start_stop: action to carry out
 661  *
 662  * start_stop == 0 disables receive on the context, for use in queue
 663  * overflow conditions.  start_stop==1 re-enables, to be used to
 664  * re-init the software copy of the head register
 665  */
 666 static int qib_manage_rcvq(struct qib_ctxtdata *rcd, unsigned subctxt,
 667                            int start_stop)
 668 {
 669         struct qib_devdata *dd = rcd->dd;
 670         unsigned int rcvctrl_op;
 671
 672         if (subctxt)
 673                 goto bail;
 674         /* atomically clear receive enable ctxt. */
 675         if (start_stop) {
 676                 /*
 677                  * On enable, force in-memory copy of the tail register to
 678                  * 0, so that protocol code doesn't have to worry about
 679                  * whether or not the chip has yet updated the in-memory
 680                  * copy or not on return from the system call. The chip
 681                  * always resets it's tail register back to 0 on a
 682                  * transition from disabled to enabled.
 683                  */
 684                 if (rcd->rcvhdrtail_kvaddr)
 685                         qib_clear_rcvhdrtail(rcd);
 686                 rcvctrl_op = QIB_RCVCTRL_CTXT_ENB;
 687         } else
 688                 rcvctrl_op = QIB_RCVCTRL_CTXT_DIS;
 689         dd->f_rcvctrl(rcd->ppd, rcvctrl_op, rcd->ctxt);
 690         /* always; new head should be equal to new tail; see above */
 691 bail:
 692         return 0;
 693 }
 694
 695 static void qib_clean_part_key(struct qib_ctxtdata *rcd,
 696                                struct qib_devdata *dd)
 697 {
 698         int i, j, pchanged = 0;
 699         u64 oldpkey;
 700         struct qib_pportdata *ppd = rcd->ppd;
 701
 702         /* for debugging only */
 703         oldpkey = (u64) ppd->pkeys[0] |
 704                 ((u64) ppd->pkeys[1] << 16) |
 705                 ((u64) ppd->pkeys[2] << 32) |
 706                 ((u64) ppd->pkeys[3] << 48);
 707
 708         for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
 709                 if (!rcd->pkeys[i])
 710                         continue;
 711                 for (j = 0; j < ARRAY_SIZE(ppd->pkeys); j++) {
 712                         /* check for match independent of the global bit */
 713                         if ((ppd->pkeys[j] & 0x7fff) !=
 714                             (rcd->pkeys[i] & 0x7fff))
 715                                 continue;
 716                         if (atomic_dec_and_test(&ppd->pkeyrefs[j])) {
 717                                 ppd->pkeys[j] = 0;
 718                                 pchanged++;
 719                         }
 720                         break;
 721                 }
 722                 rcd->pkeys[i] = 0;
 723         }
 724         if (pchanged)
 725                 (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);
 726 }
 727
 728 /* common code for the mappings on dma_alloc_coherent mem */
 729 static int qib_mmap_mem(struct vm_area_struct *vma, struct qib_ctxtdata *rcd,
 730                         unsigned len, void *kvaddr, u32 write_ok, char *what)
 731 {
 732         struct qib_devdata *dd = rcd->dd;
 733         unsigned long pfn;
 734         int ret;
 735
 736         if ((vma->vm_end - vma->vm_start) > len) {
 737                 qib_devinfo(dd->pcidev,
 738                          "FAIL on %s: len %lx > %x\n", what,
 739                          vma->vm_end - vma->vm_start, len);
 740                 ret = -EFAULT;
 741                 goto bail;
 742         }
 743
 744         /*
 745          * shared context user code requires rcvhdrq mapped r/w, others
 746          * only allowed readonly mapping.
 747          */
 748         if (!write_ok) {
 749                 if (vma->vm_flags & VM_WRITE) {
 750                         qib_devinfo(dd->pcidev,
 751                                  "%s must be mapped readonly\n", what);
 752                         ret = -EPERM;
 753                         goto bail;
 754                 }
 755
 756                 /* don't allow them to later change with mprotect */
 757                 vma->vm_flags &= ~VM_MAYWRITE;
 758         }
 759
 760         pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
 761         ret = remap_pfn_range(vma, vma->vm_start, pfn,
 762                               len, vma->vm_page_prot);
 763         if (ret)
 764                 qib_devinfo(dd->pcidev,
 765                         "%s ctxt%u mmap of %lx, %x bytes failed: %d\n",
 766                         what, rcd->ctxt, pfn, len, ret);
 767 bail:
 768         return ret;
 769 }
 770
 771 static int mmap_ureg(struct vm_area_struct *vma, struct qib_devdata *dd,
 772                      u64 ureg)
 773 {
 774         unsigned long phys;
 775         unsigned long sz;
 776         int ret;
 777
 778         /*
 779          * This is real hardware, so use io_remap.  This is the mechanism
 780          * for the user process to update the head registers for their ctxt
 781          * in the chip.
 782          */
 783         sz = dd->flags & QIB_HAS_HDRSUPP ? 2 * PAGE_SIZE : PAGE_SIZE;
 784         if ((vma->vm_end - vma->vm_start) > sz) {
 785                 qib_devinfo(dd->pcidev,
 786                         "FAIL mmap userreg: reqlen %lx > PAGE\n",
 787                         vma->vm_end - vma->vm_start);
 788                 ret = -EFAULT;
 789         } else {
 790                 phys = dd->physaddr + ureg;
 791                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 792
 793                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
 794                 ret = io_remap_pfn_range(vma, vma->vm_start,
 795                                          phys >> PAGE_SHIFT,
 796                                          vma->vm_end - vma->vm_start,
 797                                          vma->vm_page_prot);
 798         }
 799         return ret;
 800 }
 801
 802 static int mmap_piobufs(struct vm_area_struct *vma,
 803                         struct qib_devdata *dd,
 804                         struct qib_ctxtdata *rcd,
 805                         unsigned piobufs, unsigned piocnt)
 806 {
 807         unsigned long phys;
 808         int ret;
 809
 810         /*
 811          * When we map the PIO buffers in the chip, we want to map them as
 812          * writeonly, no read possible; unfortunately, x86 doesn't allow
 813          * for this in hardware, but we still prevent users from asking
 814          * for it.
 815          */
 816         if ((vma->vm_end - vma->vm_start) > (piocnt * dd->palign)) {
 817                 qib_devinfo(dd->pcidev,
 818                         "FAIL mmap piobufs: reqlen %lx > PAGE\n",
 819                          vma->vm_end - vma->vm_start);
 820                 ret = -EINVAL;
 821                 goto bail;
 822         }
 823
 824         phys = dd->physaddr + piobufs;
 825
 826 #if defined(__powerpc__)
 827         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 828 #endif
 829
 830         /*
 831          * don't allow them to later change to readable with mprotect (for when
 832          * not initially mapped readable, as is normally the case)
 833          */
 834         vma->vm_flags &= ~VM_MAYREAD;
 835         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
 836
 837         /* We used PAT if wc_cookie == 0 */
 838         if (!dd->wc_cookie)
 839                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 840
 841         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
 842                                  vma->vm_end - vma->vm_start,
 843                                  vma->vm_page_prot);
 844 bail:
 845         return ret;
 846 }
 847
 848 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
 849                            struct qib_ctxtdata *rcd)
 850 {
 851         struct qib_devdata *dd = rcd->dd;
 852         unsigned long start, size;
 853         size_t total_size, i;
 854         unsigned long pfn;
 855         int ret;
 856
 857         size = rcd->rcvegrbuf_size;
 858         total_size = rcd->rcvegrbuf_chunks * size;
 859         if ((vma->vm_end - vma->vm_start) > total_size) {
 860                 qib_devinfo(dd->pcidev,
 861                         "FAIL on egr bufs: reqlen %lx > actual %lx\n",
 862                          vma->vm_end - vma->vm_start,
 863                          (unsigned long) total_size);
 864                 ret = -EINVAL;
 865                 goto bail;
 866         }
 867
 868         if (vma->vm_flags & VM_WRITE) {
 869                 qib_devinfo(dd->pcidev,
 870                         "Can't map eager buffers as writable (flags=%lx)\n",
 871                         vma->vm_flags);
 872                 ret = -EPERM;
 873                 goto bail;
 874         }
 875         /* don't allow them to later change to writeable with mprotect */
 876         vma->vm_flags &= ~VM_MAYWRITE;
 877
 878         start = vma->vm_start;
 879
 880         for (i = 0; i < rcd->rcvegrbuf_chunks; i++, start += size) {
 881                 pfn = virt_to_phys(rcd->rcvegrbuf[i]) >> PAGE_SHIFT;
 882                 ret = remap_pfn_range(vma, start, pfn, size,
 883                                       vma->vm_page_prot);
 884                 if (ret < 0)
 885                         goto bail;
 886         }
 887         ret = 0;
 888
 889 bail:
 890         return ret;
 891 }
 892
 893 /*
 894  * qib_file_vma_fault - handle a VMA page fault.
 895  */
 896 static int qib_file_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 897 {
 898         struct page *page;
 899
 900         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
 901         if (!page)
 902                 return VM_FAULT_SIGBUS;
 903
 904         get_page(page);
 905         vmf->page = page;
 906
 907         return 0;
 908 }
 909
 910 static const struct vm_operations_struct qib_file_vm_ops = {
 911         .fault = qib_file_vma_fault,
 912 };
 913
 914 static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
 915                        struct qib_ctxtdata *rcd, unsigned subctxt)
 916 {
 917         struct qib_devdata *dd = rcd->dd;
 918         unsigned subctxt_cnt;
 919         unsigned long len;
 920         void *addr;
 921         size_t size;
 922         int ret = 0;
 923
 924         subctxt_cnt = rcd->subctxt_cnt;
 925         size = rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size;
 926
 927         /*
 928          * Each process has all the subctxt uregbase, rcvhdrq, and
 929          * rcvegrbufs mmapped - as an array for all the processes,
 930          * and also separately for this process.
 931          */
 932         if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase)) {
 933                 addr = rcd->subctxt_uregbase;
 934                 size = PAGE_SIZE * subctxt_cnt;
 935         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base)) {
 936                 addr = rcd->subctxt_rcvhdr_base;
 937                 size = rcd->rcvhdrq_size * subctxt_cnt;
 938         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf)) {
 939                 addr = rcd->subctxt_rcvegrbuf;
 940                 size *= subctxt_cnt;
 941         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase +
 942                                         PAGE_SIZE * subctxt)) {
 943                 addr = rcd->subctxt_uregbase + PAGE_SIZE * subctxt;
 944                 size = PAGE_SIZE;
 945         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base +
 946                                         rcd->rcvhdrq_size * subctxt)) {
 947                 addr = rcd->subctxt_rcvhdr_base +
 948                         rcd->rcvhdrq_size * subctxt;
 949                 size = rcd->rcvhdrq_size;
 950         } else if (pgaddr == cvt_kvaddr(&rcd->user_event_mask[subctxt])) {
 951                 addr = rcd->user_event_mask;
 952                 size = PAGE_SIZE;
 953         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf +
 954                                         size * subctxt)) {
 955                 addr = rcd->subctxt_rcvegrbuf + size * subctxt;
 956                 /* rcvegrbufs are read-only on the slave */
 957                 if (vma->vm_flags & VM_WRITE) {
 958                         qib_devinfo(dd->pcidev,
 959                                  "Can't map eager buffers as writable (flags=%lx)\n",
 960                                  vma->vm_flags);
 961                         ret = -EPERM;
 962                         goto bail;
 963                 }
 964                 /*
 965                  * Don't allow permission to later change to writeable
 966                  * with mprotect.
 967                  */
 968                 vma->vm_flags &= ~VM_MAYWRITE;
 969         } else
 970                 goto bail;
 971         len = vma->vm_end - vma->vm_start;
 972         if (len > size) {
 973                 ret = -EINVAL;
 974                 goto bail;
 975         }
 976
 977         vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
 978         vma->vm_ops = &qib_file_vm_ops;
 979         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 980         ret = 1;
 981
 982 bail:
 983         return ret;
 984 }
 985
 986 /**
 987  * qib_mmapf - mmap various structures into user space
 988  * @fp: the file pointer
 989  * @vma: the VM area
 990  *
 991  * We use this to have a shared buffer between the kernel and the user code
 992  * for the rcvhdr queue, egr buffers, and the per-context user regs and pio
 993  * buffers in the chip.  We have the open and close entries so we can bump
 994  * the ref count and keep the driver from being unloaded while still mapped.
 995  */
 996 static int qib_mmapf(struct file *fp, struct vm_area_struct *vma)
 997 {
 998         struct qib_ctxtdata *rcd;
 999         struct qib_devdata *dd;
1000         u64 pgaddr, ureg;
1001         unsigned piobufs, piocnt;
1002         int ret, match = 1;
1003
1004         rcd = ctxt_fp(fp);
1005         if (!rcd || !(vma->vm_flags & VM_SHARED)) {
1006                 ret = -EINVAL;
1007                 goto bail;
1008         }
1009         dd = rcd->dd;
1010
1011         /*
1012          * This is the qib_do_user_init() code, mapping the shared buffers
1013          * and per-context user registers into the user process. The address
1014          * referred to by vm_pgoff is the file offset passed via mmap().
1015          * For shared contexts, this is the kernel vmalloc() address of the
1016          * pages to share with the master.
1017          * For non-shared or master ctxts, this is a physical address.
1018          * We only do one mmap for each space mapped.
1019          */
1020         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1021
1022         /*
1023          * Check for 0 in case one of the allocations failed, but user
1024          * called mmap anyway.
1025          */
1026         if (!pgaddr)  {
1027                 ret = -EINVAL;
1028                 goto bail;
1029         }
1030
1031         /*
1032          * Physical addresses must fit in 40 bits for our hardware.
1033          * Check for kernel virtual addresses first, anything else must
1034          * match a HW or memory address.
1035          */
1036         ret = mmap_kvaddr(vma, pgaddr, rcd, subctxt_fp(fp));
1037         if (ret) {
1038                 if (ret > 0)
1039                         ret = 0;
1040                 goto bail;
1041         }
1042
1043         ureg = dd->uregbase + dd->ureg_align * rcd->ctxt;
1044         if (!rcd->subctxt_cnt) {
1045                 /* ctxt is not shared */
1046                 piocnt = rcd->piocnt;
1047                 piobufs = rcd->piobufs;
1048         } else if (!subctxt_fp(fp)) {
1049                 /* caller is the master */
1050                 piocnt = (rcd->piocnt / rcd->subctxt_cnt) +
1051                          (rcd->piocnt % rcd->subctxt_cnt);
1052                 piobufs = rcd->piobufs +
1053                         dd->palign * (rcd->piocnt - piocnt);
1054         } else {
1055                 unsigned slave = subctxt_fp(fp) - 1;
1056
1057                 /* caller is a slave */
1058                 piocnt = rcd->piocnt / rcd->subctxt_cnt;
1059                 piobufs = rcd->piobufs + dd->palign * piocnt * slave;
1060         }
1061
1062         if (pgaddr == ureg)
1063                 ret = mmap_ureg(vma, dd, ureg);
1064         else if (pgaddr == piobufs)
1065                 ret = mmap_piobufs(vma, dd, rcd, piobufs, piocnt);
1066         else if (pgaddr == dd->pioavailregs_phys)
1067                 /* in-memory copy of pioavail registers */
1068                 ret = qib_mmap_mem(vma, rcd, PAGE_SIZE,
1069                                    (void *) dd->pioavailregs_dma, 0,
1070                                    "pioavail registers");
1071         else if (pgaddr == rcd->rcvegr_phys)
1072                 ret = mmap_rcvegrbufs(vma, rcd);
1073         else if (pgaddr == (u64) rcd->rcvhdrq_phys)
1074                 /*
1075                  * The rcvhdrq itself; multiple pages, contiguous
1076                  * from an i/o perspective.  Shared contexts need
1077                  * to map r/w, so we allow writing.
1078                  */
1079                 ret = qib_mmap_mem(vma, rcd, rcd->rcvhdrq_size,
1080                                    rcd->rcvhdrq, 1, "rcvhdrq");
1081         else if (pgaddr == (u64) rcd->rcvhdrqtailaddr_phys)
1082                 /* in-memory copy of rcvhdrq tail register */
1083                 ret = qib_mmap_mem(vma, rcd, PAGE_SIZE,
1084                                    rcd->rcvhdrtail_kvaddr, 0,
1085                                    "rcvhdrq tail");
1086         else
1087                 match = 0;
1088         if (!match)
1089                 ret = -EINVAL;
1090
1091         vma->vm_private_data = NULL;
1092
1093         if (ret < 0)
1094                 qib_devinfo(dd->pcidev,
1095                          "mmap Failure %d: off %llx len %lx\n",
1096                          -ret, (unsigned long long)pgaddr,
1097                          vma->vm_end - vma->vm_start);
1098 bail:
1099         return ret;
1100 }
1101
1102 static unsigned int qib_poll_urgent(struct qib_ctxtdata *rcd,
1103                                     struct file *fp,
1104                                     struct poll_table_struct *pt)
1105 {
1106         struct qib_devdata *dd = rcd->dd;
1107         unsigned pollflag;
1108
1109         poll_wait(fp, &rcd->wait, pt);
1110
1111         spin_lock_irq(&dd->uctxt_lock);
1112         if (rcd->urgent != rcd->urgent_poll) {
1113                 pollflag = POLLIN | POLLRDNORM;
1114                 rcd->urgent_poll = rcd->urgent;
1115         } else {
1116                 pollflag = 0;
1117                 set_bit(QIB_CTXT_WAITING_URG, &rcd->flag);
1118         }
1119         spin_unlock_irq(&dd->uctxt_lock);
1120
1121         return pollflag;
1122 }
1123
1124 static unsigned int qib_poll_next(struct qib_ctxtdata *rcd,
1125                                   struct file *fp,
1126                                   struct poll_table_struct *pt)
1127 {
1128         struct qib_devdata *dd = rcd->dd;
1129         unsigned pollflag;
1130
1131         poll_wait(fp, &rcd->wait, pt);
1132
1133         spin_lock_irq(&dd->uctxt_lock);
1134         if (dd->f_hdrqempty(rcd)) {
1135                 set_bit(QIB_CTXT_WAITING_RCV, &rcd->flag);
1136                 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_ENB, rcd->ctxt);
1137                 pollflag = 0;
1138         } else
1139                 pollflag = POLLIN | POLLRDNORM;
1140         spin_unlock_irq(&dd->uctxt_lock);
1141
1142         return pollflag;
1143 }
1144
1145 static unsigned int qib_poll(struct file *fp, struct poll_table_struct *pt)
1146 {
1147         struct qib_ctxtdata *rcd;
1148         unsigned pollflag;
1149
1150         rcd = ctxt_fp(fp);
1151         if (!rcd)
1152                 pollflag = POLLERR;
1153         else if (rcd->poll_type == QIB_POLL_TYPE_URGENT)
1154                 pollflag = qib_poll_urgent(rcd, fp, pt);
1155         else  if (rcd->poll_type == QIB_POLL_TYPE_ANYRCV)
1156                 pollflag = qib_poll_next(rcd, fp, pt);
1157         else /* invalid */
1158                 pollflag = POLLERR;
1159
1160         return pollflag;
1161 }
1162
1163 static void assign_ctxt_affinity(struct file *fp, struct qib_devdata *dd)
1164 {
1165         struct qib_filedata *fd = fp->private_data;
1166         const unsigned int weight = cpumask_weight(&current->cpus_allowed);
1167         const struct cpumask *local_mask = cpumask_of_pcibus(dd->pcidev->bus);
1168         int local_cpu;
1169
1170         /*
1171          * If process has NOT already set it's affinity, select and
1172          * reserve a processor for it on the local NUMA node.
1173          */
1174         if ((weight >= qib_cpulist_count) &&
1175                 (cpumask_weight(local_mask) <= qib_cpulist_count)) {
1176                 for_each_cpu(local_cpu, local_mask)
1177                         if (!test_and_set_bit(local_cpu, qib_cpulist)) {
1178                                 fd->rec_cpu_num = local_cpu;
1179                                 return;
1180                         }
1181         }
1182
1183         /*
1184          * If process has NOT already set it's affinity, select and
1185          * reserve a processor for it, as a rendevous for all
1186          * users of the driver.  If they don't actually later
1187          * set affinity to this cpu, or set it to some other cpu,
1188          * it just means that sooner or later we don't recommend
1189          * a cpu, and let the scheduler do it's best.
1190          */
1191         if (weight >= qib_cpulist_count) {
1192                 int cpu;
1193
1194                 cpu = find_first_zero_bit(qib_cpulist,
1195                                           qib_cpulist_count);
1196                 if (cpu == qib_cpulist_count)
1197                         qib_dev_err(dd,
1198                         "no cpus avail for affinity PID %u\n",
1199                         current->pid);
1200                 else {
1201                         __set_bit(cpu, qib_cpulist);
1202                         fd->rec_cpu_num = cpu;
1203                 }
1204         }
1205 }
1206
1207 /*
1208  * Check that userland and driver are compatible for subcontexts.
1209  */
1210 static int qib_compatible_subctxts(int user_swmajor, int user_swminor)
1211 {
1212         /* this code is written long-hand for clarity */
1213         if (QIB_USER_SWMAJOR != user_swmajor) {
1214                 /* no promise of compatibility if major mismatch */
1215                 return 0;
1216         }
1217         if (QIB_USER_SWMAJOR == 1) {
1218                 switch (QIB_USER_SWMINOR) {
1219                 case 0:
1220                 case 1:
1221                 case 2:
1222                         /* no subctxt implementation so cannot be compatible */
1223                         return 0;
1224                 case 3:
1225                         /* 3 is only compatible with itself */
1226                         return user_swminor == 3;
1227                 default:
1228                         /* >= 4 are compatible (or are expected to be) */
1229                         return user_swminor <= QIB_USER_SWMINOR;
1230                 }
1231         }
1232         /* make no promises yet for future major versions */
1233         return 0;
1234 }
1235
1236 static int init_subctxts(struct qib_devdata *dd,
1237                          struct qib_ctxtdata *rcd,
1238                          const struct qib_user_info *uinfo)
1239 {
1240         int ret = 0;
1241         unsigned num_subctxts;
1242         size_t size;
1243
1244         /*
1245          * If the user is requesting zero subctxts,
1246          * skip the subctxt allocation.
1247          */
1248         if (uinfo->spu_subctxt_cnt <= 0)
1249                 goto bail;
1250         num_subctxts = uinfo->spu_subctxt_cnt;
1251
1252         /* Check for subctxt compatibility */
1253         if (!qib_compatible_subctxts(uinfo->spu_userversion >> 16,
1254                 uinfo->spu_userversion & 0xffff)) {
1255                 qib_devinfo(dd->pcidev,
1256                          "Mismatched user version (%d.%d) and driver version (%d.%d) while context sharing. Ensure that driver and library are from the same release.\n",
1257                          (int) (uinfo->spu_userversion >> 16),
1258                          (int) (uinfo->spu_userversion & 0xffff),
1259                          QIB_USER_SWMAJOR, QIB_USER_SWMINOR);
1260                 goto bail;
1261         }
1262         if (num_subctxts > QLOGIC_IB_MAX_SUBCTXT) {
1263                 ret = -EINVAL;
1264                 goto bail;
1265         }
1266
1267         rcd->subctxt_uregbase = vmalloc_user(PAGE_SIZE * num_subctxts);
1268         if (!rcd->subctxt_uregbase) {
1269                 ret = -ENOMEM;
1270                 goto bail;
1271         }
1272         /* Note: rcd->rcvhdrq_size isn't initialized yet. */
1273         size = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize *
1274                      sizeof(u32), PAGE_SIZE) * num_subctxts;
1275         rcd->subctxt_rcvhdr_base = vmalloc_user(size);
1276         if (!rcd->subctxt_rcvhdr_base) {
1277                 ret = -ENOMEM;
1278                 goto bail_ureg;
1279         }
1280
1281         rcd->subctxt_rcvegrbuf = vmalloc_user(rcd->rcvegrbuf_chunks *
1282                                               rcd->rcvegrbuf_size *
1283                                               num_subctxts);
1284         if (!rcd->subctxt_rcvegrbuf) {
1285                 ret = -ENOMEM;
1286                 goto bail_rhdr;
1287         }
1288
1289         rcd->subctxt_cnt = uinfo->spu_subctxt_cnt;
1290         rcd->subctxt_id = uinfo->spu_subctxt_id;
1291         rcd->active_slaves = 1;
1292         rcd->redirect_seq_cnt = 1;
1293         set_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag);
1294         goto bail;
1295
1296 bail_rhdr:
1297         vfree(rcd->subctxt_rcvhdr_base);
1298 bail_ureg:
1299         vfree(rcd->subctxt_uregbase);
1300         rcd->subctxt_uregbase = NULL;
1301 bail:
1302         return ret;
1303 }
1304
1305 static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
1306                       struct file *fp, const struct qib_user_info *uinfo)
1307 {
1308         struct qib_filedata *fd = fp->private_data;
1309         struct qib_devdata *dd = ppd->dd;
1310         struct qib_ctxtdata *rcd;
1311         void *ptmp = NULL;
1312         int ret;
1313         int numa_id;
1314
1315         assign_ctxt_affinity(fp, dd);
1316
1317         numa_id = qib_numa_aware ? ((fd->rec_cpu_num != -1) ?
1318                 cpu_to_node(fd->rec_cpu_num) :
1319                 numa_node_id()) : dd->assigned_node_id;
1320
1321         rcd = qib_create_ctxtdata(ppd, ctxt, numa_id);
1322
1323         /*
1324          * Allocate memory for use in qib_tid_update() at open to
1325          * reduce cost of expected send setup per message segment
1326          */
1327         if (rcd)
1328                 ptmp = kmalloc(dd->rcvtidcnt * sizeof(u16) +
1329                                dd->rcvtidcnt * sizeof(struct page **),
1330                                GFP_KERNEL);
1331
1332         if (!rcd || !ptmp) {
1333                 qib_dev_err(dd,
1334                         "Unable to allocate ctxtdata memory, failing open\n");
1335                 ret = -ENOMEM;
1336                 goto bailerr;
1337         }
1338         rcd->userversion = uinfo->spu_userversion;
1339         ret = init_subctxts(dd, rcd, uinfo);
1340         if (ret)
1341                 goto bailerr;
1342         rcd->tid_pg_list = ptmp;
1343         rcd->pid = current->pid;
1344         init_waitqueue_head(&dd->rcd[ctxt]->wait);
1345         strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
1346         ctxt_fp(fp) = rcd;
1347         qib_stats.sps_ctxts++;
1348         dd->freectxts--;
1349         ret = 0;
1350         goto bail;
1351
1352 bailerr:
1353         if (fd->rec_cpu_num != -1)
1354                 __clear_bit(fd->rec_cpu_num, qib_cpulist);
1355
1356         dd->rcd[ctxt] = NULL;
1357         kfree(rcd);
1358         kfree(ptmp);
1359 bail:
1360         return ret;
1361 }
1362
1363 static inline int usable(struct qib_pportdata *ppd)
1364 {
1365         struct qib_devdata *dd = ppd->dd;
1366
1367         return dd && (dd->flags & QIB_PRESENT) && dd->kregbase && ppd->lid &&
1368                 (ppd->lflags & QIBL_LINKACTIVE);
1369 }
1370
1371 /*
1372  * Select a context on the given device, either using a requested port
1373  * or the port based on the context number.
1374  */
1375 static int choose_port_ctxt(struct file *fp, struct qib_devdata *dd, u32 port,
1376                             const struct qib_user_info *uinfo)
1377 {
1378         struct qib_pportdata *ppd = NULL;
1379         int ret, ctxt;
1380
1381         if (port) {
1382                 if (!usable(dd->pport + port - 1)) {
1383                         ret = -ENETDOWN;
1384                         goto done;
1385                 } else
1386                         ppd = dd->pport + port - 1;
1387         }
1388         for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts && dd->rcd[ctxt];
1389              ctxt++)
1390                 ;
1391         if (ctxt == dd->cfgctxts) {
1392                 ret = -EBUSY;
1393                 goto done;
1394         }
1395         if (!ppd) {
1396                 u32 pidx = ctxt % dd->num_pports;
1397
1398                 if (usable(dd->pport + pidx))
1399                         ppd = dd->pport + pidx;
1400                 else {
1401                         for (pidx = 0; pidx < dd->num_pports && !ppd;
1402                              pidx++)
1403                                 if (usable(dd->pport + pidx))
1404                                         ppd = dd->pport + pidx;
1405                 }
1406         }
1407         ret = ppd ? setup_ctxt(ppd, ctxt, fp, uinfo) : -ENETDOWN;
1408 done:
1409         return ret;
1410 }
1411
1412 static int find_free_ctxt(int unit, struct file *fp,
1413                           const struct qib_user_info *uinfo)
1414 {
1415         struct qib_devdata *dd = qib_lookup(unit);
1416         int ret;
1417
1418         if (!dd || (uinfo->spu_port && uinfo->spu_port > dd->num_pports))
1419                 ret = -ENODEV;
1420         else
1421                 ret = choose_port_ctxt(fp, dd, uinfo->spu_port, uinfo);
1422
1423         return ret;
1424 }
1425
1426 static int get_a_ctxt(struct file *fp, const struct qib_user_info *uinfo,
1427                       unsigned alg)
1428 {
1429         struct qib_devdata *udd = NULL;
1430         int ret = 0, devmax, npresent, nup, ndev, dusable = 0, i;
1431         u32 port = uinfo->spu_port, ctxt;
1432
1433         devmax = qib_count_units(&npresent, &nup);
1434         if (!npresent) {
1435                 ret = -ENXIO;
1436                 goto done;
1437         }
1438         if (nup == 0) {
1439                 ret = -ENETDOWN;
1440                 goto done;
1441         }
1442
1443         if (alg == QIB_PORT_ALG_ACROSS) {
1444                 unsigned inuse = ~0U;
1445
1446                 /* find device (with ACTIVE ports) with fewest ctxts in use */
1447                 for (ndev = 0; ndev < devmax; ndev++) {
1448                         struct qib_devdata *dd = qib_lookup(ndev);
1449                         unsigned cused = 0, cfree = 0, pusable = 0;
1450
1451                         if (!dd)
1452                                 continue;
1453                         if (port && port <= dd->num_pports &&
1454                             usable(dd->pport + port - 1))
1455                                 pusable = 1;
1456                         else
1457                                 for (i = 0; i < dd->num_pports; i++)
1458                                         if (usable(dd->pport + i))
1459                                                 pusable++;
1460                         if (!pusable)
1461                                 continue;
1462                         for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts;
1463                              ctxt++)
1464                                 if (dd->rcd[ctxt])
1465                                         cused++;
1466                                 else
1467                                         cfree++;
1468                         if (cfree && cused < inuse) {
1469                                 udd = dd;
1470                                 inuse = cused;
1471                         }
1472                 }
1473                 if (udd) {
1474                         ret = choose_port_ctxt(fp, udd, port, uinfo);
1475                         goto done;
1476                 }
1477         } else {
1478                 for (ndev = 0; ndev < devmax; ndev++) {
1479                         struct qib_devdata *dd = qib_lookup(ndev);
1480
1481                         if (dd) {
1482                                 ret = choose_port_ctxt(fp, dd, port, uinfo);
1483                                 if (!ret)
1484                                         goto done;
1485                                 if (ret == -EBUSY)
1486                                         dusable++;
1487                         }
1488                 }
1489         }
1490         ret = dusable ? -EBUSY : -ENETDOWN;
1491
1492 done:
1493         return ret;
1494 }
1495
1496 static int find_shared_ctxt(struct file *fp,
1497                             const struct qib_user_info *uinfo)
1498 {
1499         int devmax, ndev, i;
1500         int ret = 0;
1501
1502         devmax = qib_count_units(NULL, NULL);
1503
1504         for (ndev = 0; ndev < devmax; ndev++) {
1505                 struct qib_devdata *dd = qib_lookup(ndev);
1506
1507                 /* device portion of usable() */
1508                 if (!(dd && (dd->flags & QIB_PRESENT) && dd->kregbase))
1509                         continue;
1510                 for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) {
1511                         struct qib_ctxtdata *rcd = dd->rcd[i];
1512
1513                         /* Skip ctxts which are not yet open */
1514                         if (!rcd || !rcd->cnt)
1515                                 continue;
1516                         /* Skip ctxt if it doesn't match the requested one */
1517                         if (rcd->subctxt_id != uinfo->spu_subctxt_id)
1518                                 continue;
1519                         /* Verify the sharing process matches the master */
1520                         if (rcd->subctxt_cnt != uinfo->spu_subctxt_cnt ||
1521                             rcd->userversion != uinfo->spu_userversion ||
1522                             rcd->cnt >= rcd->subctxt_cnt) {
1523                                 ret = -EINVAL;
1524                                 goto done;
1525                         }
1526                         ctxt_fp(fp) = rcd;
1527                         subctxt_fp(fp) = rcd->cnt++;
1528                         rcd->subpid[subctxt_fp(fp)] = current->pid;
1529                         tidcursor_fp(fp) = 0;
1530                         rcd->active_slaves |= 1 << subctxt_fp(fp);
1531                         ret = 1;
1532                         goto done;
1533                 }
1534         }
1535
1536 done:
1537         return ret;
1538 }
1539
1540 static int qib_open(struct inode *in, struct file *fp)
1541 {
1542         /* The real work is performed later in qib_assign_ctxt() */
1543         fp->private_data = kzalloc(sizeof(struct qib_filedata), GFP_KERNEL);
1544         if (fp->private_data) /* no cpu affinity by default */
1545                 ((struct qib_filedata *)fp->private_data)->rec_cpu_num = -1;
1546         return fp->private_data ? 0 : -ENOMEM;
1547 }
1548
1549 static int find_hca(unsigned int cpu, int *unit)
1550 {
1551         int ret = 0, devmax, npresent, nup, ndev;
1552
1553         *unit = -1;
1554
1555         devmax = qib_count_units(&npresent, &nup);
1556         if (!npresent) {
1557                 ret = -ENXIO;
1558                 goto done;
1559         }
1560         if (!nup) {
1561                 ret = -ENETDOWN;
1562                 goto done;
1563         }
1564         for (ndev = 0; ndev < devmax; ndev++) {
1565                 struct qib_devdata *dd = qib_lookup(ndev);
1566
1567                 if (dd) {
1568                         if (pcibus_to_node(dd->pcidev->bus) < 0) {
1569                                 ret = -EINVAL;
1570                                 goto done;
1571                         }
1572                         if (cpu_to_node(cpu) ==
1573                                 pcibus_to_node(dd->pcidev->bus)) {
1574                                 *unit = ndev;
1575                                 goto done;
1576                         }
1577                 }
1578         }
1579 done:
1580         return ret;
1581 }
1582
1583 static int do_qib_user_sdma_queue_create(struct file *fp)
1584 {
1585         struct qib_filedata *fd = fp->private_data;
1586         struct qib_ctxtdata *rcd = fd->rcd;
1587         struct qib_devdata *dd = rcd->dd;
1588
1589         if (dd->flags & QIB_HAS_SEND_DMA) {
1590
1591                 fd->pq = qib_user_sdma_queue_create(&dd->pcidev->dev,
1592                                                     dd->unit,
1593                                                     rcd->ctxt,
1594                                                     fd->subctxt);
1595                 if (!fd->pq)
1596                         return -ENOMEM;
1597         }
1598
1599         return 0;
1600 }
1601
1602 /*
1603  * Get ctxt early, so can set affinity prior to memory allocation.
1604  */
1605 static int qib_assign_ctxt(struct file *fp, const struct qib_user_info *uinfo)
1606 {
1607         int ret;
1608         int i_minor;
1609         unsigned swmajor, swminor, alg = QIB_PORT_ALG_ACROSS;
1610
1611         /* Check to be sure we haven't already initialized this file */
1612         if (ctxt_fp(fp)) {
1613                 ret = -EINVAL;
1614                 goto done;
1615         }
1616
1617         /* for now, if major version is different, bail */
1618         swmajor = uinfo->spu_userversion >> 16;
1619         if (swmajor != QIB_USER_SWMAJOR) {
1620                 ret = -ENODEV;
1621                 goto done;
1622         }
1623
1624         swminor = uinfo->spu_userversion & 0xffff;
1625
1626         if (swminor >= 11 && uinfo->spu_port_alg < QIB_PORT_ALG_COUNT)
1627                 alg = uinfo->spu_port_alg;
1628
1629         mutex_lock(&qib_mutex);
1630
1631         if (qib_compatible_subctxts(swmajor, swminor) &&
1632             uinfo->spu_subctxt_cnt) {
1633                 ret = find_shared_ctxt(fp, uinfo);
1634                 if (ret > 0) {
1635                         ret = do_qib_user_sdma_queue_create(fp);
1636                         if (!ret)
1637                                 assign_ctxt_affinity(fp, (ctxt_fp(fp))->dd);
1638                         goto done_ok;
1639                 }
1640         }
1641
1642         i_minor = iminor(file_inode(fp)) - QIB_USER_MINOR_BASE;
1643         if (i_minor)
1644                 ret = find_free_ctxt(i_minor - 1, fp, uinfo);
1645         else {
1646                 int unit;
1647                 const unsigned int cpu = cpumask_first(&current->cpus_allowed);
1648                 const unsigned int weight =
1649                         cpumask_weight(&current->cpus_allowed);
1650
1651                 if (weight == 1 && !test_bit(cpu, qib_cpulist))
1652                         if (!find_hca(cpu, &unit) && unit >= 0)
1653                                 if (!find_free_ctxt(unit, fp, uinfo)) {
1654                                         ret = 0;
1655                                         goto done_chk_sdma;
1656                                 }
1657                 ret = get_a_ctxt(fp, uinfo, alg);
1658         }
1659
1660 done_chk_sdma:
1661         if (!ret)
1662                 ret = do_qib_user_sdma_queue_create(fp);
1663 done_ok:
1664         mutex_unlock(&qib_mutex);
1665
1666 done:
1667         return ret;
1668 }
1669
1670
1671 static int qib_do_user_init(struct file *fp,
1672                             const struct qib_user_info *uinfo)
1673 {
1674         int ret;
1675         struct qib_ctxtdata *rcd = ctxt_fp(fp);
1676         struct qib_devdata *dd;
1677         unsigned uctxt;
1678
1679         /* Subctxts don't need to initialize anything since master did it. */
1680         if (subctxt_fp(fp)) {
1681                 ret = wait_event_interruptible(rcd->wait,
1682                         !test_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag));
1683                 goto bail;
1684         }
1685
1686         dd = rcd->dd;
1687
1688         /* some ctxts may get extra buffers, calculate that here */
1689         uctxt = rcd->ctxt - dd->first_user_ctxt;
1690         if (uctxt < dd->ctxts_extrabuf) {
1691                 rcd->piocnt = dd->pbufsctxt + 1;
1692                 rcd->pio_base = rcd->piocnt * uctxt;
1693         } else {
1694                 rcd->piocnt = dd->pbufsctxt;
1695                 rcd->pio_base = rcd->piocnt * uctxt +
1696                         dd->ctxts_extrabuf;
1697         }
1698
1699         /*
1700          * All user buffers are 2KB buffers.  If we ever support
1701          * giving 4KB buffers to user processes, this will need some
1702          * work.  Can't use piobufbase directly, because it has
1703          * both 2K and 4K buffer base values.  So check and handle.
1704          */
1705         if ((rcd->pio_base + rcd->piocnt) > dd->piobcnt2k) {
1706                 if (rcd->pio_base >= dd->piobcnt2k) {
1707                         qib_dev_err(dd,
1708                                     "%u:ctxt%u: no 2KB buffers available\n",
1709                                     dd->unit, rcd->ctxt);
1710                         ret = -ENOBUFS;
1711                         goto bail;
1712                 }
1713                 rcd->piocnt = dd->piobcnt2k - rcd->pio_base;
1714                 qib_dev_err(dd, "Ctxt%u: would use 4KB bufs, using %u\n",
1715                             rcd->ctxt, rcd->piocnt);
1716         }
1717
1718         rcd->piobufs = dd->pio2k_bufbase + rcd->pio_base * dd->palign;
1719         qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt,
1720                                TXCHK_CHG_TYPE_USER, rcd);
1721         /*
1722          * try to ensure that processes start up with consistent avail update
1723          * for their own range, at least.   If system very quiet, it might
1724          * have the in-memory copy out of date at startup for this range of
1725          * buffers, when a context gets re-used.  Do after the chg_pioavail
1726          * and before the rest of setup, so it's "almost certain" the dma
1727          * will have occurred (can't 100% guarantee, but should be many
1728          * decimals of 9s, with this ordering), given how much else happens
1729          * after this.
1730          */
1731         dd->f_sendctrl(dd->pport, QIB_SENDCTRL_AVAIL_BLIP);
1732
1733         /*
1734          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1735          * array for time being.  If rcd->ctxt > chip-supported,
1736          * we need to do extra stuff here to handle by handling overflow
1737          * through ctxt 0, someday
1738          */
1739         ret = qib_create_rcvhdrq(dd, rcd);
1740         if (!ret)
1741                 ret = qib_setup_eagerbufs(rcd);
1742         if (ret)
1743                 goto bail_pio;
1744
1745         rcd->tidcursor = 0; /* start at beginning after open */
1746
1747         /* initialize poll variables... */
1748         rcd->urgent = 0;
1749         rcd->urgent_poll = 0;
1750
1751         /*
1752          * Now enable the ctxt for receive.
1753          * For chips that are set to DMA the tail register to memory
1754          * when they change (and when the update bit transitions from
1755          * 0 to 1.  So for those chips, we turn it off and then back on.
1756          * This will (very briefly) affect any other open ctxts, but the
1757          * duration is very short, and therefore isn't an issue.  We
1758          * explicitly set the in-memory tail copy to 0 beforehand, so we
1759          * don't have to wait to be sure the DMA update has happened
1760          * (chip resets head/tail to 0 on transition to enable).
1761          */
1762         if (rcd->rcvhdrtail_kvaddr)
1763                 qib_clear_rcvhdrtail(rcd);
1764
1765         dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_TIDFLOW_ENB,
1766                       rcd->ctxt);
1767
1768         /* Notify any waiting slaves */
1769         if (rcd->subctxt_cnt) {
1770                 clear_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag);
1771                 wake_up(&rcd->wait);
1772         }
1773         return 0;
1774
1775 bail_pio:
1776         qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt,
1777                                TXCHK_CHG_TYPE_KERN, rcd);
1778 bail:
1779         return ret;
1780 }
1781
1782 /**
1783  * unlock_exptid - unlock any expected TID entries context still had in use
1784  * @rcd: ctxt
1785  *
1786  * We don't actually update the chip here, because we do a bulk update
1787  * below, using f_clear_tids.
1788  */
1789 static void unlock_expected_tids(struct qib_ctxtdata *rcd)
1790 {
1791         struct qib_devdata *dd = rcd->dd;
1792         int ctxt_tidbase = rcd->ctxt * dd->rcvtidcnt;
1793         int i, cnt = 0, maxtid = ctxt_tidbase + dd->rcvtidcnt;
1794
1795         for (i = ctxt_tidbase; i < maxtid; i++) {
1796                 struct page *p = dd->pageshadow[i];
1797                 dma_addr_t phys;
1798
1799                 if (!p)
1800                         continue;
1801
1802                 phys = dd->physshadow[i];
1803                 dd->physshadow[i] = dd->tidinvalid;
1804                 dd->pageshadow[i] = NULL;
1805                 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
1806                                PCI_DMA_FROMDEVICE);
1807                 qib_release_user_pages(&p, 1);
1808                 cnt++;
1809         }
1810 }
1811
1812 static int qib_close(struct inode *in, struct file *fp)
1813 {
1814         int ret = 0;
1815         struct qib_filedata *fd;
1816         struct qib_ctxtdata *rcd;
1817         struct qib_devdata *dd;
1818         unsigned long flags;
1819         unsigned ctxt;
1820         pid_t pid;
1821
1822         mutex_lock(&qib_mutex);
1823
1824         fd = fp->private_data;
1825         fp->private_data = NULL;
1826         rcd = fd->rcd;
1827         if (!rcd) {
1828                 mutex_unlock(&qib_mutex);
1829                 goto bail;
1830         }
1831
1832         dd = rcd->dd;
1833
1834         /* ensure all pio buffer writes in progress are flushed */
1835         qib_flush_wc();
1836
1837         /* drain user sdma queue */
1838         if (fd->pq) {
1839                 qib_user_sdma_queue_drain(rcd->ppd, fd->pq);
1840                 qib_user_sdma_queue_destroy(fd->pq);
1841         }
1842
1843         if (fd->rec_cpu_num != -1)
1844                 __clear_bit(fd->rec_cpu_num, qib_cpulist);
1845
1846         if (--rcd->cnt) {
1847                 /*
1848                  * XXX If the master closes the context before the slave(s),
1849                  * revoke the mmap for the eager receive queue so
1850                  * the slave(s) don't wait for receive data forever.
1851                  */
1852                 rcd->active_slaves &= ~(1 << fd->subctxt);
1853                 rcd->subpid[fd->subctxt] = 0;
1854                 mutex_unlock(&qib_mutex);
1855                 goto bail;
1856         }
1857
1858         /* early; no interrupt users after this */
1859         spin_lock_irqsave(&dd->uctxt_lock, flags);
1860         ctxt = rcd->ctxt;
1861         dd->rcd[ctxt] = NULL;
1862         pid = rcd->pid;
1863         rcd->pid = 0;
1864         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1865
1866         if (rcd->rcvwait_to || rcd->piowait_to ||
1867             rcd->rcvnowait || rcd->pionowait) {
1868                 rcd->rcvwait_to = 0;
1869                 rcd->piowait_to = 0;
1870                 rcd->rcvnowait = 0;
1871                 rcd->pionowait = 0;
1872         }
1873         if (rcd->flag)
1874                 rcd->flag = 0;
1875
1876         if (dd->kregbase) {
1877                 /* atomically clear receive enable ctxt and intr avail. */
1878                 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_DIS |
1879                                   QIB_RCVCTRL_INTRAVAIL_DIS, ctxt);
1880
1881                 /* clean up the pkeys for this ctxt user */
1882                 qib_clean_part_key(rcd, dd);
1883                 qib_disarm_piobufs(dd, rcd->pio_base, rcd->piocnt);
1884                 qib_chg_pioavailkernel(dd, rcd->pio_base,
1885                                        rcd->piocnt, TXCHK_CHG_TYPE_KERN, NULL);
1886
1887                 dd->f_clear_tids(dd, rcd);
1888
1889                 if (dd->pageshadow)
1890                         unlock_expected_tids(rcd);
1891                 qib_stats.sps_ctxts--;
1892                 dd->freectxts++;
1893         }
1894
1895         mutex_unlock(&qib_mutex);
1896         qib_free_ctxtdata(dd, rcd); /* after releasing the mutex */
1897
1898 bail:
1899         kfree(fd);
1900         return ret;
1901 }
1902
1903 static int qib_ctxt_info(struct file *fp, struct qib_ctxt_info __user *uinfo)
1904 {
1905         struct qib_ctxt_info info;
1906         int ret;
1907         size_t sz;
1908         struct qib_ctxtdata *rcd = ctxt_fp(fp);
1909         struct qib_filedata *fd;
1910
1911         fd = fp->private_data;
1912
1913         info.num_active = qib_count_active_units();
1914         info.unit = rcd->dd->unit;
1915         info.port = rcd->ppd->port;
1916         info.ctxt = rcd->ctxt;
1917         info.subctxt =  subctxt_fp(fp);
1918         /* Number of user ctxts available for this device. */
1919         info.num_ctxts = rcd->dd->cfgctxts - rcd->dd->first_user_ctxt;
1920         info.num_subctxts = rcd->subctxt_cnt;
1921         info.rec_cpu = fd->rec_cpu_num;
1922         sz = sizeof(info);
1923
1924         if (copy_to_user(uinfo, &info, sz)) {
1925                 ret = -EFAULT;
1926                 goto bail;
1927         }
1928         ret = 0;
1929
1930 bail:
1931         return ret;
1932 }
1933
1934 static int qib_sdma_get_inflight(struct qib_user_sdma_queue *pq,
1935                                  u32 __user *inflightp)
1936 {
1937         const u32 val = qib_user_sdma_inflight_counter(pq);
1938
1939         if (put_user(val, inflightp))
1940                 return -EFAULT;
1941
1942         return 0;
1943 }
1944
1945 static int qib_sdma_get_complete(struct qib_pportdata *ppd,
1946                                  struct qib_user_sdma_queue *pq,
1947                                  u32 __user *completep)
1948 {
1949         u32 val;
1950         int err;
1951
1952         if (!pq)
1953                 return -EINVAL;
1954
1955         err = qib_user_sdma_make_progress(ppd, pq);
1956         if (err < 0)
1957                 return err;
1958
1959         val = qib_user_sdma_complete_counter(pq);
1960         if (put_user(val, completep))
1961                 return -EFAULT;
1962
1963         return 0;
1964 }
1965
1966 static int disarm_req_delay(struct qib_ctxtdata *rcd)
1967 {
1968         int ret = 0;
1969
1970         if (!usable(rcd->ppd)) {
1971                 int i;
1972                 /*
1973                  * if link is down, or otherwise not usable, delay
1974                  * the caller up to 30 seconds, so we don't thrash
1975                  * in trying to get the chip back to ACTIVE, and
1976                  * set flag so they make the call again.
1977                  */
1978                 if (rcd->user_event_mask) {
1979                         /*
1980                          * subctxt_cnt is 0 if not shared, so do base
1981                          * separately, first, then remaining subctxt, if any
1982                          */
1983                         set_bit(_QIB_EVENT_DISARM_BUFS_BIT,
1984                                 &rcd->user_event_mask[0]);
1985                         for (i = 1; i < rcd->subctxt_cnt; i++)
1986                                 set_bit(_QIB_EVENT_DISARM_BUFS_BIT,
1987                                         &rcd->user_event_mask[i]);
1988                 }
1989                 for (i = 0; !usable(rcd->ppd) && i < 300; i++)
1990                         msleep(100);
1991                 ret = -ENETDOWN;
1992         }
1993         return ret;
1994 }
1995
1996 /*
1997  * Find all user contexts in use, and set the specified bit in their
1998  * event mask.
1999  * See also find_ctxt() for a similar use, that is specific to send buffers.
2000  */
2001 int qib_set_uevent_bits(struct qib_pportdata *ppd, const int evtbit)
2002 {
2003         struct qib_ctxtdata *rcd;
2004         unsigned ctxt;
2005         int ret = 0;
2006         unsigned long flags;
2007
2008         spin_lock_irqsave(&ppd->dd->uctxt_lock, flags);
2009         for (ctxt = ppd->dd->first_user_ctxt; ctxt < ppd->dd->cfgctxts;
2010              ctxt++) {
2011                 rcd = ppd->dd->rcd[ctxt];
2012                 if (!rcd)
2013                         continue;
2014                 if (rcd->user_event_mask) {
2015                         int i;
2016                         /*
2017                          * subctxt_cnt is 0 if not shared, so do base
2018                          * separately, first, then remaining subctxt, if any
2019                          */
2020                         set_bit(evtbit, &rcd->user_event_mask[0]);
2021                         for (i = 1; i < rcd->subctxt_cnt; i++)
2022                                 set_bit(evtbit, &rcd->user_event_mask[i]);
2023                 }
2024                 ret = 1;
2025                 break;
2026         }
2027         spin_unlock_irqrestore(&ppd->dd->uctxt_lock, flags);
2028
2029         return ret;
2030 }
2031
2032 /*
2033  * clear the event notifier events for this context.
2034  * For the DISARM_BUFS case, we also take action (this obsoletes
2035  * the older QIB_CMD_DISARM_BUFS, but we keep it for backwards
2036  * compatibility.
2037  * Other bits don't currently require actions, just atomically clear.
2038  * User process then performs actions appropriate to bit having been
2039  * set, if desired, and checks again in future.
2040  */
2041 static int qib_user_event_ack(struct qib_ctxtdata *rcd, int subctxt,
2042                               unsigned long events)
2043 {
2044         int ret = 0, i;
2045
2046         for (i = 0; i <= _QIB_MAX_EVENT_BIT; i++) {
2047                 if (!test_bit(i, &events))
2048                         continue;
2049                 if (i == _QIB_EVENT_DISARM_BUFS_BIT) {
2050                         (void)qib_disarm_piobufs_ifneeded(rcd);
2051                         ret = disarm_req_delay(rcd);
2052                 } else
2053                         clear_bit(i, &rcd->user_event_mask[subctxt]);
2054         }
2055         return ret;
2056 }
2057
2058 static ssize_t qib_write(struct file *fp, const char __user *data,
2059                          size_t count, loff_t *off)
2060 {
2061         const struct qib_cmd __user *ucmd;
2062         struct qib_ctxtdata *rcd;
2063         const void __user *src;
2064         size_t consumed, copy = 0;
2065         struct qib_cmd cmd;
2066         ssize_t ret = 0;
2067         void *dest;
2068
2069         if (WARN_ON_ONCE(!ib_safe_file_access(fp)))
2070                 return -EACCES;
2071
2072         if (count < sizeof(cmd.type)) {
2073                 ret = -EINVAL;
2074                 goto bail;
2075         }
2076
2077         ucmd = (const struct qib_cmd __user *) data;
2078
2079         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
2080                 ret = -EFAULT;
2081                 goto bail;
2082         }
2083
2084         consumed = sizeof(cmd.type);
2085
2086         switch (cmd.type) {
2087         case QIB_CMD_ASSIGN_CTXT:
2088         case QIB_CMD_USER_INIT:
2089                 copy = sizeof(cmd.cmd.user_info);
2090                 dest = &cmd.cmd.user_info;
2091                 src = &ucmd->cmd.user_info;
2092                 break;
2093
2094         case QIB_CMD_RECV_CTRL:
2095                 copy = sizeof(cmd.cmd.recv_ctrl);
2096                 dest = &cmd.cmd.recv_ctrl;
2097                 src = &ucmd->cmd.recv_ctrl;
2098                 break;
2099
2100         case QIB_CMD_CTXT_INFO:
2101                 copy = sizeof(cmd.cmd.ctxt_info);
2102                 dest = &cmd.cmd.ctxt_info;
2103                 src = &ucmd->cmd.ctxt_info;
2104                 break;
2105
2106         case QIB_CMD_TID_UPDATE:
2107         case QIB_CMD_TID_FREE:
2108                 copy = sizeof(cmd.cmd.tid_info);
2109                 dest = &cmd.cmd.tid_info;
2110                 src = &ucmd->cmd.tid_info;
2111                 break;
2112
2113         case QIB_CMD_SET_PART_KEY:
2114                 copy = sizeof(cmd.cmd.part_key);
2115                 dest = &cmd.cmd.part_key;
2116                 src = &ucmd->cmd.part_key;
2117                 break;
2118
2119         case QIB_CMD_DISARM_BUFS:
2120         case QIB_CMD_PIOAVAILUPD: /* force an update of PIOAvail reg */
2121                 copy = 0;
2122                 src = NULL;
2123                 dest = NULL;
2124                 break;
2125
2126         case QIB_CMD_POLL_TYPE:
2127                 copy = sizeof(cmd.cmd.poll_type);
2128                 dest = &cmd.cmd.poll_type;
2129                 src = &ucmd->cmd.poll_type;
2130                 break;
2131
2132         case QIB_CMD_ARMLAUNCH_CTRL:
2133                 copy = sizeof(cmd.cmd.armlaunch_ctrl);
2134                 dest = &cmd.cmd.armlaunch_ctrl;
2135                 src = &ucmd->cmd.armlaunch_ctrl;
2136                 break;
2137
2138         case QIB_CMD_SDMA_INFLIGHT:
2139                 copy = sizeof(cmd.cmd.sdma_inflight);
2140                 dest = &cmd.cmd.sdma_inflight;
2141                 src = &ucmd->cmd.sdma_inflight;
2142                 break;
2143
2144         case QIB_CMD_SDMA_COMPLETE:
2145                 copy = sizeof(cmd.cmd.sdma_complete);
2146                 dest = &cmd.cmd.sdma_complete;
2147                 src = &ucmd->cmd.sdma_complete;
2148                 break;
2149
2150         case QIB_CMD_ACK_EVENT:
2151                 copy = sizeof(cmd.cmd.event_mask);
2152                 dest = &cmd.cmd.event_mask;
2153                 src = &ucmd->cmd.event_mask;
2154                 break;
2155
2156         default:
2157                 ret = -EINVAL;
2158                 goto bail;
2159         }
2160
2161         if (copy) {
2162                 if ((count - consumed) < copy) {
2163                         ret = -EINVAL;
2164                         goto bail;
2165                 }
2166                 if (copy_from_user(dest, src, copy)) {
2167                         ret = -EFAULT;
2168                         goto bail;
2169                 }
2170                 consumed += copy;
2171         }
2172
2173         rcd = ctxt_fp(fp);
2174         if (!rcd && cmd.type != QIB_CMD_ASSIGN_CTXT) {
2175                 ret = -EINVAL;
2176                 goto bail;
2177         }
2178
2179         switch (cmd.type) {
2180         case QIB_CMD_ASSIGN_CTXT:
2181                 if (rcd) {
2182                         ret = -EINVAL;
2183                         goto bail;
2184                 }
2185
2186                 ret = qib_assign_ctxt(fp, &cmd.cmd.user_info);
2187                 if (ret)
2188                         goto bail;
2189                 break;
2190
2191         case QIB_CMD_USER_INIT:
2192                 ret = qib_do_user_init(fp, &cmd.cmd.user_info);
2193                 if (ret)
2194                         goto bail;
2195                 ret = qib_get_base_info(fp, (void __user *) (unsigned long)
2196                                         cmd.cmd.user_info.spu_base_info,
2197                                         cmd.cmd.user_info.spu_base_info_size);
2198                 break;
2199
2200         case QIB_CMD_RECV_CTRL:
2201                 ret = qib_manage_rcvq(rcd, subctxt_fp(fp), cmd.cmd.recv_ctrl);
2202                 break;
2203
2204         case QIB_CMD_CTXT_INFO:
2205                 ret = qib_ctxt_info(fp, (struct qib_ctxt_info __user *)
2206                                     (unsigned long) cmd.cmd.ctxt_info);
2207                 break;
2208
2209         case QIB_CMD_TID_UPDATE:
2210                 ret = qib_tid_update(rcd, fp, &cmd.cmd.tid_info);
2211                 break;
2212
2213         case QIB_CMD_TID_FREE:
2214                 ret = qib_tid_free(rcd, subctxt_fp(fp), &cmd.cmd.tid_info);
2215                 break;
2216
2217         case QIB_CMD_SET_PART_KEY:
2218                 ret = qib_set_part_key(rcd, cmd.cmd.part_key);
2219                 break;
2220
2221         case QIB_CMD_DISARM_BUFS:
2222                 (void)qib_disarm_piobufs_ifneeded(rcd);
2223                 ret = disarm_req_delay(rcd);
2224                 break;
2225
2226         case QIB_CMD_PIOAVAILUPD:
2227                 qib_force_pio_avail_update(rcd->dd);
2228                 break;
2229
2230         case QIB_CMD_POLL_TYPE:
2231                 rcd->poll_type = cmd.cmd.poll_type;
2232                 break;
2233
2234         case QIB_CMD_ARMLAUNCH_CTRL:
2235                 rcd->dd->f_set_armlaunch(rcd->dd, cmd.cmd.armlaunch_ctrl);
2236                 break;
2237
2238         case QIB_CMD_SDMA_INFLIGHT:
2239                 ret = qib_sdma_get_inflight(user_sdma_queue_fp(fp),
2240                                             (u32 __user *) (unsigned long)
2241                                             cmd.cmd.sdma_inflight);
2242                 break;
2243
2244         case QIB_CMD_SDMA_COMPLETE:
2245                 ret = qib_sdma_get_complete(rcd->ppd,
2246                                             user_sdma_queue_fp(fp),
2247                                             (u32 __user *) (unsigned long)
2248                                             cmd.cmd.sdma_complete);
2249                 break;
2250
2251         case QIB_CMD_ACK_EVENT:
2252                 ret = qib_user_event_ack(rcd, subctxt_fp(fp),
2253                                          cmd.cmd.event_mask);
2254                 break;
2255         }
2256
2257         if (ret >= 0)
2258                 ret = consumed;
2259
2260 bail:
2261         return ret;
2262 }
2263
2264 static ssize_t qib_write_iter(struct kiocb *iocb, struct iov_iter *from)
2265 {
2266         struct qib_filedata *fp = iocb->ki_filp->private_data;
2267         struct qib_ctxtdata *rcd = ctxt_fp(iocb->ki_filp);
2268         struct qib_user_sdma_queue *pq = fp->pq;
2269
2270         if (!iter_is_iovec(from) || !from->nr_segs || !pq)
2271                 return -EINVAL;
2272
2273         return qib_user_sdma_writev(rcd, pq, from->iov, from->nr_segs);
2274 }
2275
2276 static struct class *qib_class;
2277 static dev_t qib_dev;
2278
2279 int qib_cdev_init(int minor, const char *name,
2280                   const struct file_operations *fops,
2281                   struct cdev **cdevp, struct device **devp)
2282 {
2283         const dev_t dev = MKDEV(MAJOR(qib_dev), minor);
2284         struct cdev *cdev;
2285         struct device *device = NULL;
2286         int ret;
2287
2288         cdev = cdev_alloc();
2289         if (!cdev) {
2290                 pr_err("Could not allocate cdev for minor %d, %s\n",
2291                        minor, name);
2292                 ret = -ENOMEM;
2293                 goto done;
2294         }
2295
2296         cdev->owner = THIS_MODULE;
2297         cdev->ops = fops;
2298         kobject_set_name(&cdev->kobj, name);
2299
2300         ret = cdev_add(cdev, dev, 1);
2301         if (ret < 0) {
2302                 pr_err("Could not add cdev for minor %d, %s (err %d)\n",
2303                        minor, name, -ret);
2304                 goto err_cdev;
2305         }
2306
2307         device = device_create(qib_class, NULL, dev, NULL, "%s", name);
2308         if (!IS_ERR(device))
2309                 goto done;
2310         ret = PTR_ERR(device);
2311         device = NULL;
2312         pr_err("Could not create device for minor %d, %s (err %d)\n",
2313                minor, name, -ret);
2314 err_cdev:
2315         cdev_del(cdev);
2316         cdev = NULL;
2317 done:
2318         *cdevp = cdev;
2319         *devp = device;
2320         return ret;
2321 }
2322
2323 void qib_cdev_cleanup(struct cdev **cdevp, struct device **devp)
2324 {
2325         struct device *device = *devp;
2326
2327         if (device) {
2328                 device_unregister(device);
2329                 *devp = NULL;
2330         }
2331
2332         if (*cdevp) {
2333                 cdev_del(*cdevp);
2334                 *cdevp = NULL;
2335         }
2336 }
2337
2338 static struct cdev *wildcard_cdev;
2339 static struct device *wildcard_device;
2340
2341 int __init qib_dev_init(void)
2342 {
2343         int ret;
2344
2345         ret = alloc_chrdev_region(&qib_dev, 0, QIB_NMINORS, QIB_DRV_NAME);
2346         if (ret < 0) {
2347                 pr_err("Could not allocate chrdev region (err %d)\n", -ret);
2348                 goto done;
2349         }
2350
2351         qib_class = class_create(THIS_MODULE, "ipath");
2352         if (IS_ERR(qib_class)) {
2353                 ret = PTR_ERR(qib_class);
2354                 pr_err("Could not create device class (err %d)\n", -ret);
2355                 unregister_chrdev_region(qib_dev, QIB_NMINORS);
2356         }
2357
2358 done:
2359         return ret;
2360 }
2361
2362 void qib_dev_cleanup(void)
2363 {
2364         if (qib_class) {
2365                 class_destroy(qib_class);
2366                 qib_class = NULL;
2367         }
2368
2369         unregister_chrdev_region(qib_dev, QIB_NMINORS);
2370 }
2371
2372 static atomic_t user_count = ATOMIC_INIT(0);
2373
2374 static void qib_user_remove(struct qib_devdata *dd)
2375 {
2376         if (atomic_dec_return(&user_count) == 0)
2377                 qib_cdev_cleanup(&wildcard_cdev, &wildcard_device);
2378
2379         qib_cdev_cleanup(&dd->user_cdev, &dd->user_device);
2380 }
2381
2382 static int qib_user_add(struct qib_devdata *dd)
2383 {
2384         char name[10];
2385         int ret;
2386
2387         if (atomic_inc_return(&user_count) == 1) {
2388                 ret = qib_cdev_init(0, "ipath", &qib_file_ops,
2389                                     &wildcard_cdev, &wildcard_device);
2390                 if (ret)
2391                         goto done;
2392         }
2393
2394         snprintf(name, sizeof(name), "ipath%d", dd->unit);
2395         ret = qib_cdev_init(dd->unit + 1, name, &qib_file_ops,
2396                             &dd->user_cdev, &dd->user_device);
2397         if (ret)
2398                 qib_user_remove(dd);
2399 done:
2400         return ret;
2401 }
2402
2403 /*
2404  * Create per-unit files in /dev
2405  */
2406 int qib_device_create(struct qib_devdata *dd)
2407 {
2408         int r, ret;
2409
2410         r = qib_user_add(dd);
2411         ret = qib_diag_add(dd);
2412         if (r && !ret)
2413                 ret = r;
2414         return ret;
2415 }
2416
2417 /*
2418  * Remove per-unit files in /dev
2419  * void, core kernel returns no errors for this stuff
2420  */
2421 void qib_device_remove(struct qib_devdata *dd)
2422 {
2423         qib_user_remove(dd);
2424         qib_diag_remove(dd);
2425 }