Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-2.6.git] / drivers / infiniband / hw / qib / qib_file_ops.c
1 /*
2  * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
3  * 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/uio.h>
43 #include <linux/jiffies.h>
44 #include <asm/pgtable.h>
45 #include <linux/delay.h>
46 #include <linux/export.h>
47
48 #include "qib.h"
49 #include "qib_common.h"
50 #include "qib_user_sdma.h"
51
52 static int qib_open(struct inode *, struct file *);
53 static int qib_close(struct inode *, struct file *);
54 static ssize_t qib_write(struct file *, const char __user *, size_t, loff_t *);
55 static ssize_t qib_aio_write(struct kiocb *, const struct iovec *,
56                              unsigned long, loff_t);
57 static unsigned int qib_poll(struct file *, struct poll_table_struct *);
58 static int qib_mmapf(struct file *, struct vm_area_struct *);
59
60 static const struct file_operations qib_file_ops = {
61         .owner = THIS_MODULE,
62         .write = qib_write,
63         .aio_write = qib_aio_write,
64         .open = qib_open,
65         .release = qib_close,
66         .poll = qib_poll,
67         .mmap = qib_mmapf,
68         .llseek = noop_llseek,
69 };
70
71 /*
72  * Convert kernel virtual addresses to physical addresses so they don't
73  * potentially conflict with the chip addresses used as mmap offsets.
74  * It doesn't really matter what mmap offset we use as long as we can
75  * interpret it correctly.
76  */
77 static u64 cvt_kvaddr(void *p)
78 {
79         struct page *page;
80         u64 paddr = 0;
81
82         page = vmalloc_to_page(p);
83         if (page)
84                 paddr = page_to_pfn(page) << PAGE_SHIFT;
85
86         return paddr;
87 }
88
89 static int qib_get_base_info(struct file *fp, void __user *ubase,
90                              size_t ubase_size)
91 {
92         struct qib_ctxtdata *rcd = ctxt_fp(fp);
93         int ret = 0;
94         struct qib_base_info *kinfo = NULL;
95         struct qib_devdata *dd = rcd->dd;
96         struct qib_pportdata *ppd = rcd->ppd;
97         unsigned subctxt_cnt;
98         int shared, master;
99         size_t sz;
100
101         subctxt_cnt = rcd->subctxt_cnt;
102         if (!subctxt_cnt) {
103                 shared = 0;
104                 master = 0;
105                 subctxt_cnt = 1;
106         } else {
107                 shared = 1;
108                 master = !subctxt_fp(fp);
109         }
110
111         sz = sizeof(*kinfo);
112         /* If context sharing is not requested, allow the old size structure */
113         if (!shared)
114                 sz -= 7 * sizeof(u64);
115         if (ubase_size < sz) {
116                 ret = -EINVAL;
117                 goto bail;
118         }
119
120         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
121         if (kinfo == NULL) {
122                 ret = -ENOMEM;
123                 goto bail;
124         }
125
126         ret = dd->f_get_base_info(rcd, kinfo);
127         if (ret < 0)
128                 goto bail;
129
130         kinfo->spi_rcvhdr_cnt = dd->rcvhdrcnt;
131         kinfo->spi_rcvhdrent_size = dd->rcvhdrentsize;
132         kinfo->spi_tidegrcnt = rcd->rcvegrcnt;
133         kinfo->spi_rcv_egrbufsize = dd->rcvegrbufsize;
134         /*
135          * have to mmap whole thing
136          */
137         kinfo->spi_rcv_egrbuftotlen =
138                 rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size;
139         kinfo->spi_rcv_egrperchunk = rcd->rcvegrbufs_perchunk;
140         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
141                 rcd->rcvegrbuf_chunks;
142         kinfo->spi_tidcnt = dd->rcvtidcnt / subctxt_cnt;
143         if (master)
144                 kinfo->spi_tidcnt += dd->rcvtidcnt % subctxt_cnt;
145         /*
146          * for this use, may be cfgctxts summed over all chips that
147          * are are configured and present
148          */
149         kinfo->spi_nctxts = dd->cfgctxts;
150         /* unit (chip/board) our context is on */
151         kinfo->spi_unit = dd->unit;
152         kinfo->spi_port = ppd->port;
153         /* for now, only a single page */
154         kinfo->spi_tid_maxsize = PAGE_SIZE;
155
156         /*
157          * Doing this per context, and based on the skip value, etc.  This has
158          * to be the actual buffer size, since the protocol code treats it
159          * as an array.
160          *
161          * These have to be set to user addresses in the user code via mmap.
162          * These values are used on return to user code for the mmap target
163          * addresses only.  For 32 bit, same 44 bit address problem, so use
164          * the physical address, not virtual.  Before 2.6.11, using the
165          * page_address() macro worked, but in 2.6.11, even that returns the
166          * full 64 bit address (upper bits all 1's).  So far, using the
167          * physical addresses (or chip offsets, for chip mapping) works, but
168          * no doubt some future kernel release will change that, and we'll be
169          * on to yet another method of dealing with this.
170          * Normally only one of rcvhdr_tailaddr or rhf_offset is useful
171          * since the chips with non-zero rhf_offset don't normally
172          * enable tail register updates to host memory, but for testing,
173          * both can be enabled and used.
174          */
175         kinfo->spi_rcvhdr_base = (u64) rcd->rcvhdrq_phys;
176         kinfo->spi_rcvhdr_tailaddr = (u64) rcd->rcvhdrqtailaddr_phys;
177         kinfo->spi_rhf_offset = dd->rhf_offset;
178         kinfo->spi_rcv_egrbufs = (u64) rcd->rcvegr_phys;
179         kinfo->spi_pioavailaddr = (u64) dd->pioavailregs_phys;
180         /* setup per-unit (not port) status area for user programs */
181         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
182                 (char *) ppd->statusp -
183                 (char *) dd->pioavailregs_dma;
184         kinfo->spi_uregbase = (u64) dd->uregbase + dd->ureg_align * rcd->ctxt;
185         if (!shared) {
186                 kinfo->spi_piocnt = rcd->piocnt;
187                 kinfo->spi_piobufbase = (u64) rcd->piobufs;
188                 kinfo->spi_sendbuf_status = cvt_kvaddr(rcd->user_event_mask);
189         } else if (master) {
190                 kinfo->spi_piocnt = (rcd->piocnt / subctxt_cnt) +
191                                     (rcd->piocnt % subctxt_cnt);
192                 /* Master's PIO buffers are after all the slave's */
193                 kinfo->spi_piobufbase = (u64) rcd->piobufs +
194                         dd->palign *
195                         (rcd->piocnt - kinfo->spi_piocnt);
196         } else {
197                 unsigned slave = subctxt_fp(fp) - 1;
198
199                 kinfo->spi_piocnt = rcd->piocnt / subctxt_cnt;
200                 kinfo->spi_piobufbase = (u64) rcd->piobufs +
201                         dd->palign * kinfo->spi_piocnt * slave;
202         }
203
204         if (shared) {
205                 kinfo->spi_sendbuf_status =
206                         cvt_kvaddr(&rcd->user_event_mask[subctxt_fp(fp)]);
207                 /* only spi_subctxt_* fields should be set in this block! */
208                 kinfo->spi_subctxt_uregbase = cvt_kvaddr(rcd->subctxt_uregbase);
209
210                 kinfo->spi_subctxt_rcvegrbuf =
211                         cvt_kvaddr(rcd->subctxt_rcvegrbuf);
212                 kinfo->spi_subctxt_rcvhdr_base =
213                         cvt_kvaddr(rcd->subctxt_rcvhdr_base);
214         }
215
216         /*
217          * All user buffers are 2KB buffers.  If we ever support
218          * giving 4KB buffers to user processes, this will need some
219          * work.  Can't use piobufbase directly, because it has
220          * both 2K and 4K buffer base values.
221          */
222         kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->pio2k_bufbase) /
223                 dd->palign;
224         kinfo->spi_pioalign = dd->palign;
225         kinfo->spi_qpair = QIB_KD_QP;
226         /*
227          * user mode PIO buffers are always 2KB, even when 4KB can
228          * be received, and sent via the kernel; this is ibmaxlen
229          * for 2K MTU.
230          */
231         kinfo->spi_piosize = dd->piosize2k - 2 * sizeof(u32);
232         kinfo->spi_mtu = ppd->ibmaxlen; /* maxlen, not ibmtu */
233         kinfo->spi_ctxt = rcd->ctxt;
234         kinfo->spi_subctxt = subctxt_fp(fp);
235         kinfo->spi_sw_version = QIB_KERN_SWVERSION;
236         kinfo->spi_sw_version |= 1U << 31; /* QLogic-built, not kernel.org */
237         kinfo->spi_hw_version = dd->revision;
238
239         if (master)
240                 kinfo->spi_runtime_flags |= QIB_RUNTIME_MASTER;
241
242         sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
243         if (copy_to_user(ubase, kinfo, sz))
244                 ret = -EFAULT;
245 bail:
246         kfree(kinfo);
247         return ret;
248 }
249
250 /**
251  * qib_tid_update - update a context TID
252  * @rcd: the context
253  * @fp: the qib device file
254  * @ti: the TID information
255  *
256  * The new implementation as of Oct 2004 is that the driver assigns
257  * the tid and returns it to the caller.   To reduce search time, we
258  * keep a cursor for each context, walking the shadow tid array to find
259  * one that's not in use.
260  *
261  * For now, if we can't allocate the full list, we fail, although
262  * in the long run, we'll allocate as many as we can, and the
263  * caller will deal with that by trying the remaining pages later.
264  * That means that when we fail, we have to mark the tids as not in
265  * use again, in our shadow copy.
266  *
267  * It's up to the caller to free the tids when they are done.
268  * We'll unlock the pages as they free them.
269  *
270  * Also, right now we are locking one page at a time, but since
271  * the intended use of this routine is for a single group of
272  * virtually contiguous pages, that should change to improve
273  * performance.
274  */
275 static int qib_tid_update(struct qib_ctxtdata *rcd, struct file *fp,
276                           const struct qib_tid_info *ti)
277 {
278         int ret = 0, ntids;
279         u32 tid, ctxttid, cnt, i, tidcnt, tidoff;
280         u16 *tidlist;
281         struct qib_devdata *dd = rcd->dd;
282         u64 physaddr;
283         unsigned long vaddr;
284         u64 __iomem *tidbase;
285         unsigned long tidmap[8];
286         struct page **pagep = NULL;
287         unsigned subctxt = subctxt_fp(fp);
288
289         if (!dd->pageshadow) {
290                 ret = -ENOMEM;
291                 goto done;
292         }
293
294         cnt = ti->tidcnt;
295         if (!cnt) {
296                 ret = -EFAULT;
297                 goto done;
298         }
299         ctxttid = rcd->ctxt * dd->rcvtidcnt;
300         if (!rcd->subctxt_cnt) {
301                 tidcnt = dd->rcvtidcnt;
302                 tid = rcd->tidcursor;
303                 tidoff = 0;
304         } else if (!subctxt) {
305                 tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) +
306                          (dd->rcvtidcnt % rcd->subctxt_cnt);
307                 tidoff = dd->rcvtidcnt - tidcnt;
308                 ctxttid += tidoff;
309                 tid = tidcursor_fp(fp);
310         } else {
311                 tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt;
312                 tidoff = tidcnt * (subctxt - 1);
313                 ctxttid += tidoff;
314                 tid = tidcursor_fp(fp);
315         }
316         if (cnt > tidcnt) {
317                 /* make sure it all fits in tid_pg_list */
318                 qib_devinfo(dd->pcidev, "Process tried to allocate %u "
319                          "TIDs, only trying max (%u)\n", cnt, tidcnt);
320                 cnt = tidcnt;
321         }
322         pagep = (struct page **) rcd->tid_pg_list;
323         tidlist = (u16 *) &pagep[dd->rcvtidcnt];
324         pagep += tidoff;
325         tidlist += tidoff;
326
327         memset(tidmap, 0, sizeof(tidmap));
328         /* before decrement; chip actual # */
329         ntids = tidcnt;
330         tidbase = (u64 __iomem *) (((char __iomem *) dd->kregbase) +
331                                    dd->rcvtidbase +
332                                    ctxttid * sizeof(*tidbase));
333
334         /* virtual address of first page in transfer */
335         vaddr = ti->tidvaddr;
336         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
337                        cnt * PAGE_SIZE)) {
338                 ret = -EFAULT;
339                 goto done;
340         }
341         ret = qib_get_user_pages(vaddr, cnt, pagep);
342         if (ret) {
343                 /*
344                  * if (ret == -EBUSY)
345                  * We can't continue because the pagep array won't be
346                  * initialized. This should never happen,
347                  * unless perhaps the user has mpin'ed the pages
348                  * themselves.
349                  */
350                 qib_devinfo(dd->pcidev,
351                          "Failed to lock addr %p, %u pages: "
352                          "errno %d\n", (void *) vaddr, cnt, -ret);
353                 goto done;
354         }
355         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
356                 for (; ntids--; tid++) {
357                         if (tid == tidcnt)
358                                 tid = 0;
359                         if (!dd->pageshadow[ctxttid + tid])
360                                 break;
361                 }
362                 if (ntids < 0) {
363                         /*
364                          * Oops, wrapped all the way through their TIDs,
365                          * and didn't have enough free; see comments at
366                          * start of routine
367                          */
368                         i--;    /* last tidlist[i] not filled in */
369                         ret = -ENOMEM;
370                         break;
371                 }
372                 tidlist[i] = tid + tidoff;
373                 /* we "know" system pages and TID pages are same size */
374                 dd->pageshadow[ctxttid + tid] = pagep[i];
375                 dd->physshadow[ctxttid + tid] =
376                         qib_map_page(dd->pcidev, pagep[i], 0, PAGE_SIZE,
377                                      PCI_DMA_FROMDEVICE);
378                 /*
379                  * don't need atomic or it's overhead
380                  */
381                 __set_bit(tid, tidmap);
382                 physaddr = dd->physshadow[ctxttid + tid];
383                 /* PERFORMANCE: below should almost certainly be cached */
384                 dd->f_put_tid(dd, &tidbase[tid],
385                                   RCVHQ_RCV_TYPE_EXPECTED, physaddr);
386                 /*
387                  * don't check this tid in qib_ctxtshadow, since we
388                  * just filled it in; start with the next one.
389                  */
390                 tid++;
391         }
392
393         if (ret) {
394                 u32 limit;
395 cleanup:
396                 /* jump here if copy out of updated info failed... */
397                 /* same code that's in qib_free_tid() */
398                 limit = sizeof(tidmap) * BITS_PER_BYTE;
399                 if (limit > tidcnt)
400                         /* just in case size changes in future */
401                         limit = tidcnt;
402                 tid = find_first_bit((const unsigned long *)tidmap, limit);
403                 for (; tid < limit; tid++) {
404                         if (!test_bit(tid, tidmap))
405                                 continue;
406                         if (dd->pageshadow[ctxttid + tid]) {
407                                 dma_addr_t phys;
408
409                                 phys = dd->physshadow[ctxttid + tid];
410                                 dd->physshadow[ctxttid + tid] = dd->tidinvalid;
411                                 /* PERFORMANCE: below should almost certainly
412                                  * be cached
413                                  */
414                                 dd->f_put_tid(dd, &tidbase[tid],
415                                               RCVHQ_RCV_TYPE_EXPECTED,
416                                               dd->tidinvalid);
417                                 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
418                                                PCI_DMA_FROMDEVICE);
419                                 dd->pageshadow[ctxttid + tid] = NULL;
420                         }
421                 }
422                 qib_release_user_pages(pagep, cnt);
423         } else {
424                 /*
425                  * Copy the updated array, with qib_tid's filled in, back
426                  * to user.  Since we did the copy in already, this "should
427                  * never fail" If it does, we have to clean up...
428                  */
429                 if (copy_to_user((void __user *)
430                                  (unsigned long) ti->tidlist,
431                                  tidlist, cnt * sizeof(*tidlist))) {
432                         ret = -EFAULT;
433                         goto cleanup;
434                 }
435                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
436                                  tidmap, sizeof tidmap)) {
437                         ret = -EFAULT;
438                         goto cleanup;
439                 }
440                 if (tid == tidcnt)
441                         tid = 0;
442                 if (!rcd->subctxt_cnt)
443                         rcd->tidcursor = tid;
444                 else
445                         tidcursor_fp(fp) = tid;
446         }
447
448 done:
449         return ret;
450 }
451
452 /**
453  * qib_tid_free - free a context TID
454  * @rcd: the context
455  * @subctxt: the subcontext
456  * @ti: the TID info
457  *
458  * right now we are unlocking one page at a time, but since
459  * the intended use of this routine is for a single group of
460  * virtually contiguous pages, that should change to improve
461  * performance.  We check that the TID is in range for this context
462  * but otherwise don't check validity; if user has an error and
463  * frees the wrong tid, it's only their own data that can thereby
464  * be corrupted.  We do check that the TID was in use, for sanity
465  * We always use our idea of the saved address, not the address that
466  * they pass in to us.
467  */
468 static int qib_tid_free(struct qib_ctxtdata *rcd, unsigned subctxt,
469                         const struct qib_tid_info *ti)
470 {
471         int ret = 0;
472         u32 tid, ctxttid, cnt, limit, tidcnt;
473         struct qib_devdata *dd = rcd->dd;
474         u64 __iomem *tidbase;
475         unsigned long tidmap[8];
476
477         if (!dd->pageshadow) {
478                 ret = -ENOMEM;
479                 goto done;
480         }
481
482         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
483                            sizeof tidmap)) {
484                 ret = -EFAULT;
485                 goto done;
486         }
487
488         ctxttid = rcd->ctxt * dd->rcvtidcnt;
489         if (!rcd->subctxt_cnt)
490                 tidcnt = dd->rcvtidcnt;
491         else if (!subctxt) {
492                 tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) +
493                          (dd->rcvtidcnt % rcd->subctxt_cnt);
494                 ctxttid += dd->rcvtidcnt - tidcnt;
495         } else {
496                 tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt;
497                 ctxttid += tidcnt * (subctxt - 1);
498         }
499         tidbase = (u64 __iomem *) ((char __iomem *)(dd->kregbase) +
500                                    dd->rcvtidbase +
501                                    ctxttid * sizeof(*tidbase));
502
503         limit = sizeof(tidmap) * BITS_PER_BYTE;
504         if (limit > tidcnt)
505                 /* just in case size changes in future */
506                 limit = tidcnt;
507         tid = find_first_bit(tidmap, limit);
508         for (cnt = 0; tid < limit; tid++) {
509                 /*
510                  * small optimization; if we detect a run of 3 or so without
511                  * any set, use find_first_bit again.  That's mainly to
512                  * accelerate the case where we wrapped, so we have some at
513                  * the beginning, and some at the end, and a big gap
514                  * in the middle.
515                  */
516                 if (!test_bit(tid, tidmap))
517                         continue;
518                 cnt++;
519                 if (dd->pageshadow[ctxttid + tid]) {
520                         struct page *p;
521                         dma_addr_t phys;
522
523                         p = dd->pageshadow[ctxttid + tid];
524                         dd->pageshadow[ctxttid + tid] = NULL;
525                         phys = dd->physshadow[ctxttid + tid];
526                         dd->physshadow[ctxttid + tid] = dd->tidinvalid;
527                         /* PERFORMANCE: below should almost certainly be
528                          * cached
529                          */
530                         dd->f_put_tid(dd, &tidbase[tid],
531                                       RCVHQ_RCV_TYPE_EXPECTED, dd->tidinvalid);
532                         pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
533                                        PCI_DMA_FROMDEVICE);
534                         qib_release_user_pages(&p, 1);
535                 }
536         }
537 done:
538         return ret;
539 }
540
541 /**
542  * qib_set_part_key - set a partition key
543  * @rcd: the context
544  * @key: the key
545  *
546  * We can have up to 4 active at a time (other than the default, which is
547  * always allowed).  This is somewhat tricky, since multiple contexts may set
548  * the same key, so we reference count them, and clean up at exit.  All 4
549  * partition keys are packed into a single qlogic_ib register.  It's an
550  * error for a process to set the same pkey multiple times.  We provide no
551  * mechanism to de-allocate a pkey at this time, we may eventually need to
552  * do that.  I've used the atomic operations, and no locking, and only make
553  * a single pass through what's available.  This should be more than
554  * adequate for some time. I'll think about spinlocks or the like if and as
555  * it's necessary.
556  */
557 static int qib_set_part_key(struct qib_ctxtdata *rcd, u16 key)
558 {
559         struct qib_pportdata *ppd = rcd->ppd;
560         int i, any = 0, pidx = -1;
561         u16 lkey = key & 0x7FFF;
562         int ret;
563
564         if (lkey == (QIB_DEFAULT_P_KEY & 0x7FFF)) {
565                 /* nothing to do; this key always valid */
566                 ret = 0;
567                 goto bail;
568         }
569
570         if (!lkey) {
571                 ret = -EINVAL;
572                 goto bail;
573         }
574
575         /*
576          * Set the full membership bit, because it has to be
577          * set in the register or the packet, and it seems
578          * cleaner to set in the register than to force all
579          * callers to set it.
580          */
581         key |= 0x8000;
582
583         for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
584                 if (!rcd->pkeys[i] && pidx == -1)
585                         pidx = i;
586                 if (rcd->pkeys[i] == key) {
587                         ret = -EEXIST;
588                         goto bail;
589                 }
590         }
591         if (pidx == -1) {
592                 ret = -EBUSY;
593                 goto bail;
594         }
595         for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
596                 if (!ppd->pkeys[i]) {
597                         any++;
598                         continue;
599                 }
600                 if (ppd->pkeys[i] == key) {
601                         atomic_t *pkrefs = &ppd->pkeyrefs[i];
602
603                         if (atomic_inc_return(pkrefs) > 1) {
604                                 rcd->pkeys[pidx] = key;
605                                 ret = 0;
606                                 goto bail;
607                         } else {
608                                 /*
609                                  * lost race, decrement count, catch below
610                                  */
611                                 atomic_dec(pkrefs);
612                                 any++;
613                         }
614                 }
615                 if ((ppd->pkeys[i] & 0x7FFF) == lkey) {
616                         /*
617                          * It makes no sense to have both the limited and
618                          * full membership PKEY set at the same time since
619                          * the unlimited one will disable the limited one.
620                          */
621                         ret = -EEXIST;
622                         goto bail;
623                 }
624         }
625         if (!any) {
626                 ret = -EBUSY;
627                 goto bail;
628         }
629         for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
630                 if (!ppd->pkeys[i] &&
631                     atomic_inc_return(&ppd->pkeyrefs[i]) == 1) {
632                         rcd->pkeys[pidx] = key;
633                         ppd->pkeys[i] = key;
634                         (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);
635                         ret = 0;
636                         goto bail;
637                 }
638         }
639         ret = -EBUSY;
640
641 bail:
642         return ret;
643 }
644
645 /**
646  * qib_manage_rcvq - manage a context's receive queue
647  * @rcd: the context
648  * @subctxt: the subcontext
649  * @start_stop: action to carry out
650  *
651  * start_stop == 0 disables receive on the context, for use in queue
652  * overflow conditions.  start_stop==1 re-enables, to be used to
653  * re-init the software copy of the head register
654  */
655 static int qib_manage_rcvq(struct qib_ctxtdata *rcd, unsigned subctxt,
656                            int start_stop)
657 {
658         struct qib_devdata *dd = rcd->dd;
659         unsigned int rcvctrl_op;
660
661         if (subctxt)
662                 goto bail;
663         /* atomically clear receive enable ctxt. */
664         if (start_stop) {
665                 /*
666                  * On enable, force in-memory copy of the tail register to
667                  * 0, so that protocol code doesn't have to worry about
668                  * whether or not the chip has yet updated the in-memory
669                  * copy or not on return from the system call. The chip
670                  * always resets it's tail register back to 0 on a
671                  * transition from disabled to enabled.
672                  */
673                 if (rcd->rcvhdrtail_kvaddr)
674                         qib_clear_rcvhdrtail(rcd);
675                 rcvctrl_op = QIB_RCVCTRL_CTXT_ENB;
676         } else
677                 rcvctrl_op = QIB_RCVCTRL_CTXT_DIS;
678         dd->f_rcvctrl(rcd->ppd, rcvctrl_op, rcd->ctxt);
679         /* always; new head should be equal to new tail; see above */
680 bail:
681         return 0;
682 }
683
684 static void qib_clean_part_key(struct qib_ctxtdata *rcd,
685                                struct qib_devdata *dd)
686 {
687         int i, j, pchanged = 0;
688         u64 oldpkey;
689         struct qib_pportdata *ppd = rcd->ppd;
690
691         /* for debugging only */
692         oldpkey = (u64) ppd->pkeys[0] |
693                 ((u64) ppd->pkeys[1] << 16) |
694                 ((u64) ppd->pkeys[2] << 32) |
695                 ((u64) ppd->pkeys[3] << 48);
696
697         for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
698                 if (!rcd->pkeys[i])
699                         continue;
700                 for (j = 0; j < ARRAY_SIZE(ppd->pkeys); j++) {
701                         /* check for match independent of the global bit */
702                         if ((ppd->pkeys[j] & 0x7fff) !=
703                             (rcd->pkeys[i] & 0x7fff))
704                                 continue;
705                         if (atomic_dec_and_test(&ppd->pkeyrefs[j])) {
706                                 ppd->pkeys[j] = 0;
707                                 pchanged++;
708                         }
709                         break;
710                 }
711                 rcd->pkeys[i] = 0;
712         }
713         if (pchanged)
714                 (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);
715 }
716
717 /* common code for the mappings on dma_alloc_coherent mem */
718 static int qib_mmap_mem(struct vm_area_struct *vma, struct qib_ctxtdata *rcd,
719                         unsigned len, void *kvaddr, u32 write_ok, char *what)
720 {
721         struct qib_devdata *dd = rcd->dd;
722         unsigned long pfn;
723         int ret;
724
725         if ((vma->vm_end - vma->vm_start) > len) {
726                 qib_devinfo(dd->pcidev,
727                          "FAIL on %s: len %lx > %x\n", what,
728                          vma->vm_end - vma->vm_start, len);
729                 ret = -EFAULT;
730                 goto bail;
731         }
732
733         /*
734          * shared context user code requires rcvhdrq mapped r/w, others
735          * only allowed readonly mapping.
736          */
737         if (!write_ok) {
738                 if (vma->vm_flags & VM_WRITE) {
739                         qib_devinfo(dd->pcidev,
740                                  "%s must be mapped readonly\n", what);
741                         ret = -EPERM;
742                         goto bail;
743                 }
744
745                 /* don't allow them to later change with mprotect */
746                 vma->vm_flags &= ~VM_MAYWRITE;
747         }
748
749         pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
750         ret = remap_pfn_range(vma, vma->vm_start, pfn,
751                               len, vma->vm_page_prot);
752         if (ret)
753                 qib_devinfo(dd->pcidev, "%s ctxt%u mmap of %lx, %x "
754                          "bytes failed: %d\n", what, rcd->ctxt,
755                          pfn, len, ret);
756 bail:
757         return ret;
758 }
759
760 static int mmap_ureg(struct vm_area_struct *vma, struct qib_devdata *dd,
761                      u64 ureg)
762 {
763         unsigned long phys;
764         unsigned long sz;
765         int ret;
766
767         /*
768          * This is real hardware, so use io_remap.  This is the mechanism
769          * for the user process to update the head registers for their ctxt
770          * in the chip.
771          */
772         sz = dd->flags & QIB_HAS_HDRSUPP ? 2 * PAGE_SIZE : PAGE_SIZE;
773         if ((vma->vm_end - vma->vm_start) > sz) {
774                 qib_devinfo(dd->pcidev, "FAIL mmap userreg: reqlen "
775                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
776                 ret = -EFAULT;
777         } else {
778                 phys = dd->physaddr + ureg;
779                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
780
781                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
782                 ret = io_remap_pfn_range(vma, vma->vm_start,
783                                          phys >> PAGE_SHIFT,
784                                          vma->vm_end - vma->vm_start,
785                                          vma->vm_page_prot);
786         }
787         return ret;
788 }
789
790 static int mmap_piobufs(struct vm_area_struct *vma,
791                         struct qib_devdata *dd,
792                         struct qib_ctxtdata *rcd,
793                         unsigned piobufs, unsigned piocnt)
794 {
795         unsigned long phys;
796         int ret;
797
798         /*
799          * When we map the PIO buffers in the chip, we want to map them as
800          * writeonly, no read possible; unfortunately, x86 doesn't allow
801          * for this in hardware, but we still prevent users from asking
802          * for it.
803          */
804         if ((vma->vm_end - vma->vm_start) > (piocnt * dd->palign)) {
805                 qib_devinfo(dd->pcidev, "FAIL mmap piobufs: "
806                          "reqlen %lx > PAGE\n",
807                          vma->vm_end - vma->vm_start);
808                 ret = -EINVAL;
809                 goto bail;
810         }
811
812         phys = dd->physaddr + piobufs;
813
814 #if defined(__powerpc__)
815         /* There isn't a generic way to specify writethrough mappings */
816         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
817         pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
818         pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
819 #endif
820
821         /*
822          * don't allow them to later change to readable with mprotect (for when
823          * not initially mapped readable, as is normally the case)
824          */
825         vma->vm_flags &= ~VM_MAYREAD;
826         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
827
828         if (qib_wc_pat)
829                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
830
831         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
832                                  vma->vm_end - vma->vm_start,
833                                  vma->vm_page_prot);
834 bail:
835         return ret;
836 }
837
838 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
839                            struct qib_ctxtdata *rcd)
840 {
841         struct qib_devdata *dd = rcd->dd;
842         unsigned long start, size;
843         size_t total_size, i;
844         unsigned long pfn;
845         int ret;
846
847         size = rcd->rcvegrbuf_size;
848         total_size = rcd->rcvegrbuf_chunks * size;
849         if ((vma->vm_end - vma->vm_start) > total_size) {
850                 qib_devinfo(dd->pcidev, "FAIL on egr bufs: "
851                          "reqlen %lx > actual %lx\n",
852                          vma->vm_end - vma->vm_start,
853                          (unsigned long) total_size);
854                 ret = -EINVAL;
855                 goto bail;
856         }
857
858         if (vma->vm_flags & VM_WRITE) {
859                 qib_devinfo(dd->pcidev, "Can't map eager buffers as "
860                          "writable (flags=%lx)\n", vma->vm_flags);
861                 ret = -EPERM;
862                 goto bail;
863         }
864         /* don't allow them to later change to writeable with mprotect */
865         vma->vm_flags &= ~VM_MAYWRITE;
866
867         start = vma->vm_start;
868
869         for (i = 0; i < rcd->rcvegrbuf_chunks; i++, start += size) {
870                 pfn = virt_to_phys(rcd->rcvegrbuf[i]) >> PAGE_SHIFT;
871                 ret = remap_pfn_range(vma, start, pfn, size,
872                                       vma->vm_page_prot);
873                 if (ret < 0)
874                         goto bail;
875         }
876         ret = 0;
877
878 bail:
879         return ret;
880 }
881
882 /*
883  * qib_file_vma_fault - handle a VMA page fault.
884  */
885 static int qib_file_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
886 {
887         struct page *page;
888
889         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
890         if (!page)
891                 return VM_FAULT_SIGBUS;
892
893         get_page(page);
894         vmf->page = page;
895
896         return 0;
897 }
898
899 static struct vm_operations_struct qib_file_vm_ops = {
900         .fault = qib_file_vma_fault,
901 };
902
903 static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
904                        struct qib_ctxtdata *rcd, unsigned subctxt)
905 {
906         struct qib_devdata *dd = rcd->dd;
907         unsigned subctxt_cnt;
908         unsigned long len;
909         void *addr;
910         size_t size;
911         int ret = 0;
912
913         subctxt_cnt = rcd->subctxt_cnt;
914         size = rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size;
915
916         /*
917          * Each process has all the subctxt uregbase, rcvhdrq, and
918          * rcvegrbufs mmapped - as an array for all the processes,
919          * and also separately for this process.
920          */
921         if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase)) {
922                 addr = rcd->subctxt_uregbase;
923                 size = PAGE_SIZE * subctxt_cnt;
924         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base)) {
925                 addr = rcd->subctxt_rcvhdr_base;
926                 size = rcd->rcvhdrq_size * subctxt_cnt;
927         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf)) {
928                 addr = rcd->subctxt_rcvegrbuf;
929                 size *= subctxt_cnt;
930         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase +
931                                         PAGE_SIZE * subctxt)) {
932                 addr = rcd->subctxt_uregbase + PAGE_SIZE * subctxt;
933                 size = PAGE_SIZE;
934         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base +
935                                         rcd->rcvhdrq_size * subctxt)) {
936                 addr = rcd->subctxt_rcvhdr_base +
937                         rcd->rcvhdrq_size * subctxt;
938                 size = rcd->rcvhdrq_size;
939         } else if (pgaddr == cvt_kvaddr(&rcd->user_event_mask[subctxt])) {
940                 addr = rcd->user_event_mask;
941                 size = PAGE_SIZE;
942         } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf +
943                                         size * subctxt)) {
944                 addr = rcd->subctxt_rcvegrbuf + size * subctxt;
945                 /* rcvegrbufs are read-only on the slave */
946                 if (vma->vm_flags & VM_WRITE) {
947                         qib_devinfo(dd->pcidev,
948                                  "Can't map eager buffers as "
949                                  "writable (flags=%lx)\n", vma->vm_flags);
950                         ret = -EPERM;
951                         goto bail;
952                 }
953                 /*
954                  * Don't allow permission to later change to writeable
955                  * with mprotect.
956                  */
957                 vma->vm_flags &= ~VM_MAYWRITE;
958         } else
959                 goto bail;
960         len = vma->vm_end - vma->vm_start;
961         if (len > size) {
962                 ret = -EINVAL;
963                 goto bail;
964         }
965
966         vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
967         vma->vm_ops = &qib_file_vm_ops;
968         vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
969         ret = 1;
970
971 bail:
972         return ret;
973 }
974
975 /**
976  * qib_mmapf - mmap various structures into user space
977  * @fp: the file pointer
978  * @vma: the VM area
979  *
980  * We use this to have a shared buffer between the kernel and the user code
981  * for the rcvhdr queue, egr buffers, and the per-context user regs and pio
982  * buffers in the chip.  We have the open and close entries so we can bump
983  * the ref count and keep the driver from being unloaded while still mapped.
984  */
985 static int qib_mmapf(struct file *fp, struct vm_area_struct *vma)
986 {
987         struct qib_ctxtdata *rcd;
988         struct qib_devdata *dd;
989         u64 pgaddr, ureg;
990         unsigned piobufs, piocnt;
991         int ret, match = 1;
992
993         rcd = ctxt_fp(fp);
994         if (!rcd || !(vma->vm_flags & VM_SHARED)) {
995                 ret = -EINVAL;
996                 goto bail;
997         }
998         dd = rcd->dd;
999
1000         /*
1001          * This is the qib_do_user_init() code, mapping the shared buffers
1002          * and per-context user registers into the user process. The address
1003          * referred to by vm_pgoff is the file offset passed via mmap().
1004          * For shared contexts, this is the kernel vmalloc() address of the
1005          * pages to share with the master.
1006          * For non-shared or master ctxts, this is a physical address.
1007          * We only do one mmap for each space mapped.
1008          */
1009         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1010
1011         /*
1012          * Check for 0 in case one of the allocations failed, but user
1013          * called mmap anyway.
1014          */
1015         if (!pgaddr)  {
1016                 ret = -EINVAL;
1017                 goto bail;
1018         }
1019
1020         /*
1021          * Physical addresses must fit in 40 bits for our hardware.
1022          * Check for kernel virtual addresses first, anything else must
1023          * match a HW or memory address.
1024          */
1025         ret = mmap_kvaddr(vma, pgaddr, rcd, subctxt_fp(fp));
1026         if (ret) {
1027                 if (ret > 0)
1028                         ret = 0;
1029                 goto bail;
1030         }
1031
1032         ureg = dd->uregbase + dd->ureg_align * rcd->ctxt;
1033         if (!rcd->subctxt_cnt) {
1034                 /* ctxt is not shared */
1035                 piocnt = rcd->piocnt;
1036                 piobufs = rcd->piobufs;
1037         } else if (!subctxt_fp(fp)) {
1038                 /* caller is the master */
1039                 piocnt = (rcd->piocnt / rcd->subctxt_cnt) +
1040                          (rcd->piocnt % rcd->subctxt_cnt);
1041                 piobufs = rcd->piobufs +
1042                         dd->palign * (rcd->piocnt - piocnt);
1043         } else {
1044                 unsigned slave = subctxt_fp(fp) - 1;
1045
1046                 /* caller is a slave */
1047                 piocnt = rcd->piocnt / rcd->subctxt_cnt;
1048                 piobufs = rcd->piobufs + dd->palign * piocnt * slave;
1049         }
1050
1051         if (pgaddr == ureg)
1052                 ret = mmap_ureg(vma, dd, ureg);
1053         else if (pgaddr == piobufs)
1054                 ret = mmap_piobufs(vma, dd, rcd, piobufs, piocnt);
1055         else if (pgaddr == dd->pioavailregs_phys)
1056                 /* in-memory copy of pioavail registers */
1057                 ret = qib_mmap_mem(vma, rcd, PAGE_SIZE,
1058                                    (void *) dd->pioavailregs_dma, 0,
1059                                    "pioavail registers");
1060         else if (pgaddr == rcd->rcvegr_phys)
1061                 ret = mmap_rcvegrbufs(vma, rcd);
1062         else if (pgaddr == (u64) rcd->rcvhdrq_phys)
1063                 /*
1064                  * The rcvhdrq itself; multiple pages, contiguous
1065                  * from an i/o perspective.  Shared contexts need
1066                  * to map r/w, so we allow writing.
1067                  */
1068                 ret = qib_mmap_mem(vma, rcd, rcd->rcvhdrq_size,
1069                                    rcd->rcvhdrq, 1, "rcvhdrq");
1070         else if (pgaddr == (u64) rcd->rcvhdrqtailaddr_phys)
1071                 /* in-memory copy of rcvhdrq tail register */
1072                 ret = qib_mmap_mem(vma, rcd, PAGE_SIZE,
1073                                    rcd->rcvhdrtail_kvaddr, 0,
1074                                    "rcvhdrq tail");
1075         else
1076                 match = 0;
1077         if (!match)
1078                 ret = -EINVAL;
1079
1080         vma->vm_private_data = NULL;
1081
1082         if (ret < 0)
1083                 qib_devinfo(dd->pcidev,
1084                          "mmap Failure %d: off %llx len %lx\n",
1085                          -ret, (unsigned long long)pgaddr,
1086                          vma->vm_end - vma->vm_start);
1087 bail:
1088         return ret;
1089 }
1090
1091 static unsigned int qib_poll_urgent(struct qib_ctxtdata *rcd,
1092                                     struct file *fp,
1093                                     struct poll_table_struct *pt)
1094 {
1095         struct qib_devdata *dd = rcd->dd;
1096         unsigned pollflag;
1097
1098         poll_wait(fp, &rcd->wait, pt);
1099
1100         spin_lock_irq(&dd->uctxt_lock);
1101         if (rcd->urgent != rcd->urgent_poll) {
1102                 pollflag = POLLIN | POLLRDNORM;
1103                 rcd->urgent_poll = rcd->urgent;
1104         } else {
1105                 pollflag = 0;
1106                 set_bit(QIB_CTXT_WAITING_URG, &rcd->flag);
1107         }
1108         spin_unlock_irq(&dd->uctxt_lock);
1109
1110         return pollflag;
1111 }
1112
1113 static unsigned int qib_poll_next(struct qib_ctxtdata *rcd,
1114                                   struct file *fp,
1115                                   struct poll_table_struct *pt)
1116 {
1117         struct qib_devdata *dd = rcd->dd;
1118         unsigned pollflag;
1119
1120         poll_wait(fp, &rcd->wait, pt);
1121
1122         spin_lock_irq(&dd->uctxt_lock);
1123         if (dd->f_hdrqempty(rcd)) {
1124                 set_bit(QIB_CTXT_WAITING_RCV, &rcd->flag);
1125                 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_ENB, rcd->ctxt);
1126                 pollflag = 0;
1127         } else
1128                 pollflag = POLLIN | POLLRDNORM;
1129         spin_unlock_irq(&dd->uctxt_lock);
1130
1131         return pollflag;
1132 }
1133
1134 static unsigned int qib_poll(struct file *fp, struct poll_table_struct *pt)
1135 {
1136         struct qib_ctxtdata *rcd;
1137         unsigned pollflag;
1138
1139         rcd = ctxt_fp(fp);
1140         if (!rcd)
1141                 pollflag = POLLERR;
1142         else if (rcd->poll_type == QIB_POLL_TYPE_URGENT)
1143                 pollflag = qib_poll_urgent(rcd, fp, pt);
1144         else  if (rcd->poll_type == QIB_POLL_TYPE_ANYRCV)
1145                 pollflag = qib_poll_next(rcd, fp, pt);
1146         else /* invalid */
1147                 pollflag = POLLERR;
1148
1149         return pollflag;
1150 }
1151
1152 /*
1153  * Check that userland and driver are compatible for subcontexts.
1154  */
1155 static int qib_compatible_subctxts(int user_swmajor, int user_swminor)
1156 {
1157         /* this code is written long-hand for clarity */
1158         if (QIB_USER_SWMAJOR != user_swmajor) {
1159                 /* no promise of compatibility if major mismatch */
1160                 return 0;
1161         }
1162         if (QIB_USER_SWMAJOR == 1) {
1163                 switch (QIB_USER_SWMINOR) {
1164                 case 0:
1165                 case 1:
1166                 case 2:
1167                         /* no subctxt implementation so cannot be compatible */
1168                         return 0;
1169                 case 3:
1170                         /* 3 is only compatible with itself */
1171                         return user_swminor == 3;
1172                 default:
1173                         /* >= 4 are compatible (or are expected to be) */
1174                         return user_swminor >= 4;
1175                 }
1176         }
1177         /* make no promises yet for future major versions */
1178         return 0;
1179 }
1180
1181 static int init_subctxts(struct qib_devdata *dd,
1182                          struct qib_ctxtdata *rcd,
1183                          const struct qib_user_info *uinfo)
1184 {
1185         int ret = 0;
1186         unsigned num_subctxts;
1187         size_t size;
1188
1189         /*
1190          * If the user is requesting zero subctxts,
1191          * skip the subctxt allocation.
1192          */
1193         if (uinfo->spu_subctxt_cnt <= 0)
1194                 goto bail;
1195         num_subctxts = uinfo->spu_subctxt_cnt;
1196
1197         /* Check for subctxt compatibility */
1198         if (!qib_compatible_subctxts(uinfo->spu_userversion >> 16,
1199                 uinfo->spu_userversion & 0xffff)) {
1200                 qib_devinfo(dd->pcidev,
1201                          "Mismatched user version (%d.%d) and driver "
1202                          "version (%d.%d) while context sharing. Ensure "
1203                          "that driver and library are from the same "
1204                          "release.\n",
1205                          (int) (uinfo->spu_userversion >> 16),
1206                          (int) (uinfo->spu_userversion & 0xffff),
1207                          QIB_USER_SWMAJOR, QIB_USER_SWMINOR);
1208                 goto bail;
1209         }
1210         if (num_subctxts > QLOGIC_IB_MAX_SUBCTXT) {
1211                 ret = -EINVAL;
1212                 goto bail;
1213         }
1214
1215         rcd->subctxt_uregbase = vmalloc_user(PAGE_SIZE * num_subctxts);
1216         if (!rcd->subctxt_uregbase) {
1217                 ret = -ENOMEM;
1218                 goto bail;
1219         }
1220         /* Note: rcd->rcvhdrq_size isn't initialized yet. */
1221         size = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize *
1222                      sizeof(u32), PAGE_SIZE) * num_subctxts;
1223         rcd->subctxt_rcvhdr_base = vmalloc_user(size);
1224         if (!rcd->subctxt_rcvhdr_base) {
1225                 ret = -ENOMEM;
1226                 goto bail_ureg;
1227         }
1228
1229         rcd->subctxt_rcvegrbuf = vmalloc_user(rcd->rcvegrbuf_chunks *
1230                                               rcd->rcvegrbuf_size *
1231                                               num_subctxts);
1232         if (!rcd->subctxt_rcvegrbuf) {
1233                 ret = -ENOMEM;
1234                 goto bail_rhdr;
1235         }
1236
1237         rcd->subctxt_cnt = uinfo->spu_subctxt_cnt;
1238         rcd->subctxt_id = uinfo->spu_subctxt_id;
1239         rcd->active_slaves = 1;
1240         rcd->redirect_seq_cnt = 1;
1241         set_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag);
1242         goto bail;
1243
1244 bail_rhdr:
1245         vfree(rcd->subctxt_rcvhdr_base);
1246 bail_ureg:
1247         vfree(rcd->subctxt_uregbase);
1248         rcd->subctxt_uregbase = NULL;
1249 bail:
1250         return ret;
1251 }
1252
1253 static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
1254                       struct file *fp, const struct qib_user_info *uinfo)
1255 {
1256         struct qib_devdata *dd = ppd->dd;
1257         struct qib_ctxtdata *rcd;
1258         void *ptmp = NULL;
1259         int ret;
1260
1261         rcd = qib_create_ctxtdata(ppd, ctxt);
1262
1263         /*
1264          * Allocate memory for use in qib_tid_update() at open to
1265          * reduce cost of expected send setup per message segment
1266          */
1267         if (rcd)
1268                 ptmp = kmalloc(dd->rcvtidcnt * sizeof(u16) +
1269                                dd->rcvtidcnt * sizeof(struct page **),
1270                                GFP_KERNEL);
1271
1272         if (!rcd || !ptmp) {
1273                 qib_dev_err(dd, "Unable to allocate ctxtdata "
1274                             "memory, failing open\n");
1275                 ret = -ENOMEM;
1276                 goto bailerr;
1277         }
1278         rcd->userversion = uinfo->spu_userversion;
1279         ret = init_subctxts(dd, rcd, uinfo);
1280         if (ret)
1281                 goto bailerr;
1282         rcd->tid_pg_list = ptmp;
1283         rcd->pid = current->pid;
1284         init_waitqueue_head(&dd->rcd[ctxt]->wait);
1285         strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
1286         ctxt_fp(fp) = rcd;
1287         qib_stats.sps_ctxts++;
1288         dd->freectxts--;
1289         ret = 0;
1290         goto bail;
1291
1292 bailerr:
1293         dd->rcd[ctxt] = NULL;
1294         kfree(rcd);
1295         kfree(ptmp);
1296 bail:
1297         return ret;
1298 }
1299
1300 static inline int usable(struct qib_pportdata *ppd)
1301 {
1302         struct qib_devdata *dd = ppd->dd;
1303
1304         return dd && (dd->flags & QIB_PRESENT) && dd->kregbase && ppd->lid &&
1305                 (ppd->lflags & QIBL_LINKACTIVE);
1306 }
1307
1308 /*
1309  * Select a context on the given device, either using a requested port
1310  * or the port based on the context number.
1311  */
1312 static int choose_port_ctxt(struct file *fp, struct qib_devdata *dd, u32 port,
1313                             const struct qib_user_info *uinfo)
1314 {
1315         struct qib_pportdata *ppd = NULL;
1316         int ret, ctxt;
1317
1318         if (port) {
1319                 if (!usable(dd->pport + port - 1)) {
1320                         ret = -ENETDOWN;
1321                         goto done;
1322                 } else
1323                         ppd = dd->pport + port - 1;
1324         }
1325         for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts && dd->rcd[ctxt];
1326              ctxt++)
1327                 ;
1328         if (ctxt == dd->cfgctxts) {
1329                 ret = -EBUSY;
1330                 goto done;
1331         }
1332         if (!ppd) {
1333                 u32 pidx = ctxt % dd->num_pports;
1334                 if (usable(dd->pport + pidx))
1335                         ppd = dd->pport + pidx;
1336                 else {
1337                         for (pidx = 0; pidx < dd->num_pports && !ppd;
1338                              pidx++)
1339                                 if (usable(dd->pport + pidx))
1340                                         ppd = dd->pport + pidx;
1341                 }
1342         }
1343         ret = ppd ? setup_ctxt(ppd, ctxt, fp, uinfo) : -ENETDOWN;
1344 done:
1345         return ret;
1346 }
1347
1348 static int find_free_ctxt(int unit, struct file *fp,
1349                           const struct qib_user_info *uinfo)
1350 {
1351         struct qib_devdata *dd = qib_lookup(unit);
1352         int ret;
1353
1354         if (!dd || (uinfo->spu_port && uinfo->spu_port > dd->num_pports))
1355                 ret = -ENODEV;
1356         else
1357                 ret = choose_port_ctxt(fp, dd, uinfo->spu_port, uinfo);
1358
1359         return ret;
1360 }
1361
1362 static int get_a_ctxt(struct file *fp, const struct qib_user_info *uinfo,
1363                       unsigned alg)
1364 {
1365         struct qib_devdata *udd = NULL;
1366         int ret = 0, devmax, npresent, nup, ndev, dusable = 0, i;
1367         u32 port = uinfo->spu_port, ctxt;
1368
1369         devmax = qib_count_units(&npresent, &nup);
1370         if (!npresent) {
1371                 ret = -ENXIO;
1372                 goto done;
1373         }
1374         if (nup == 0) {
1375                 ret = -ENETDOWN;
1376                 goto done;
1377         }
1378
1379         if (alg == QIB_PORT_ALG_ACROSS) {
1380                 unsigned inuse = ~0U;
1381                 /* find device (with ACTIVE ports) with fewest ctxts in use */
1382                 for (ndev = 0; ndev < devmax; ndev++) {
1383                         struct qib_devdata *dd = qib_lookup(ndev);
1384                         unsigned cused = 0, cfree = 0, pusable = 0;
1385                         if (!dd)
1386                                 continue;
1387                         if (port && port <= dd->num_pports &&
1388                             usable(dd->pport + port - 1))
1389                                 pusable = 1;
1390                         else
1391                                 for (i = 0; i < dd->num_pports; i++)
1392                                         if (usable(dd->pport + i))
1393                                                 pusable++;
1394                         if (!pusable)
1395                                 continue;
1396                         for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts;
1397                              ctxt++)
1398                                 if (dd->rcd[ctxt])
1399                                         cused++;
1400                                 else
1401                                         cfree++;
1402                         if (pusable && cfree && cused < inuse) {
1403                                 udd = dd;
1404                                 inuse = cused;
1405                         }
1406                 }
1407                 if (udd) {
1408                         ret = choose_port_ctxt(fp, udd, port, uinfo);
1409                         goto done;
1410                 }
1411         } else {
1412                 for (ndev = 0; ndev < devmax; ndev++) {
1413                         struct qib_devdata *dd = qib_lookup(ndev);
1414                         if (dd) {
1415                                 ret = choose_port_ctxt(fp, dd, port, uinfo);
1416                                 if (!ret)
1417                                         goto done;
1418                                 if (ret == -EBUSY)
1419                                         dusable++;
1420                         }
1421                 }
1422         }
1423         ret = dusable ? -EBUSY : -ENETDOWN;
1424
1425 done:
1426         return ret;
1427 }
1428
1429 static int find_shared_ctxt(struct file *fp,
1430                             const struct qib_user_info *uinfo)
1431 {
1432         int devmax, ndev, i;
1433         int ret = 0;
1434
1435         devmax = qib_count_units(NULL, NULL);
1436
1437         for (ndev = 0; ndev < devmax; ndev++) {
1438                 struct qib_devdata *dd = qib_lookup(ndev);
1439
1440                 /* device portion of usable() */
1441                 if (!(dd && (dd->flags & QIB_PRESENT) && dd->kregbase))
1442                         continue;
1443                 for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) {
1444                         struct qib_ctxtdata *rcd = dd->rcd[i];
1445
1446                         /* Skip ctxts which are not yet open */
1447                         if (!rcd || !rcd->cnt)
1448                                 continue;
1449                         /* Skip ctxt if it doesn't match the requested one */
1450                         if (rcd->subctxt_id != uinfo->spu_subctxt_id)
1451                                 continue;
1452                         /* Verify the sharing process matches the master */
1453                         if (rcd->subctxt_cnt != uinfo->spu_subctxt_cnt ||
1454                             rcd->userversion != uinfo->spu_userversion ||
1455                             rcd->cnt >= rcd->subctxt_cnt) {
1456                                 ret = -EINVAL;
1457                                 goto done;
1458                         }
1459                         ctxt_fp(fp) = rcd;
1460                         subctxt_fp(fp) = rcd->cnt++;
1461                         rcd->subpid[subctxt_fp(fp)] = current->pid;
1462                         tidcursor_fp(fp) = 0;
1463                         rcd->active_slaves |= 1 << subctxt_fp(fp);
1464                         ret = 1;
1465                         goto done;
1466                 }
1467         }
1468
1469 done:
1470         return ret;
1471 }
1472
1473 static int qib_open(struct inode *in, struct file *fp)
1474 {
1475         /* The real work is performed later in qib_assign_ctxt() */
1476         fp->private_data = kzalloc(sizeof(struct qib_filedata), GFP_KERNEL);
1477         if (fp->private_data) /* no cpu affinity by default */
1478                 ((struct qib_filedata *)fp->private_data)->rec_cpu_num = -1;
1479         return fp->private_data ? 0 : -ENOMEM;
1480 }
1481
1482 /*
1483  * Get ctxt early, so can set affinity prior to memory allocation.
1484  */
1485 static int qib_assign_ctxt(struct file *fp, const struct qib_user_info *uinfo)
1486 {
1487         int ret;
1488         int i_minor;
1489         unsigned swmajor, swminor, alg = QIB_PORT_ALG_ACROSS;
1490
1491         /* Check to be sure we haven't already initialized this file */
1492         if (ctxt_fp(fp)) {
1493                 ret = -EINVAL;
1494                 goto done;
1495         }
1496
1497         /* for now, if major version is different, bail */
1498         swmajor = uinfo->spu_userversion >> 16;
1499         if (swmajor != QIB_USER_SWMAJOR) {
1500                 ret = -ENODEV;
1501                 goto done;
1502         }
1503
1504         swminor = uinfo->spu_userversion & 0xffff;
1505
1506         if (swminor >= 11 && uinfo->spu_port_alg < QIB_PORT_ALG_COUNT)
1507                 alg = uinfo->spu_port_alg;
1508
1509         mutex_lock(&qib_mutex);
1510
1511         if (qib_compatible_subctxts(swmajor, swminor) &&
1512             uinfo->spu_subctxt_cnt) {
1513                 ret = find_shared_ctxt(fp, uinfo);
1514                 if (ret) {
1515                         if (ret > 0)
1516                                 ret = 0;
1517                         goto done_chk_sdma;
1518                 }
1519         }
1520
1521         i_minor = iminor(fp->f_dentry->d_inode) - QIB_USER_MINOR_BASE;
1522         if (i_minor)
1523                 ret = find_free_ctxt(i_minor - 1, fp, uinfo);
1524         else
1525                 ret = get_a_ctxt(fp, uinfo, alg);
1526
1527 done_chk_sdma:
1528         if (!ret) {
1529                 struct qib_filedata *fd = fp->private_data;
1530                 const struct qib_ctxtdata *rcd = fd->rcd;
1531                 const struct qib_devdata *dd = rcd->dd;
1532                 unsigned int weight;
1533
1534                 if (dd->flags & QIB_HAS_SEND_DMA) {
1535                         fd->pq = qib_user_sdma_queue_create(&dd->pcidev->dev,
1536                                                             dd->unit,
1537                                                             rcd->ctxt,
1538                                                             fd->subctxt);
1539                         if (!fd->pq)
1540                                 ret = -ENOMEM;
1541                 }
1542
1543                 /*
1544                  * If process has NOT already set it's affinity, select and
1545                  * reserve a processor for it, as a rendezvous for all
1546                  * users of the driver.  If they don't actually later
1547                  * set affinity to this cpu, or set it to some other cpu,
1548                  * it just means that sooner or later we don't recommend
1549                  * a cpu, and let the scheduler do it's best.
1550                  */
1551                 weight = cpumask_weight(tsk_cpus_allowed(current));
1552                 if (!ret && weight >= qib_cpulist_count) {
1553                         int cpu;
1554                         cpu = find_first_zero_bit(qib_cpulist,
1555                                                   qib_cpulist_count);
1556                         if (cpu != qib_cpulist_count) {
1557                                 __set_bit(cpu, qib_cpulist);
1558                                 fd->rec_cpu_num = cpu;
1559                         }
1560                 } else if (weight == 1 &&
1561                         test_bit(cpumask_first(tsk_cpus_allowed(current)),
1562                                  qib_cpulist))
1563                         qib_devinfo(dd->pcidev, "%s PID %u affinity "
1564                                     "set to cpu %d; already allocated\n",
1565                                     current->comm, current->pid,
1566                                     cpumask_first(tsk_cpus_allowed(current)));
1567         }
1568
1569         mutex_unlock(&qib_mutex);
1570
1571 done:
1572         return ret;
1573 }
1574
1575
1576 static int qib_do_user_init(struct file *fp,
1577                             const struct qib_user_info *uinfo)
1578 {
1579         int ret;
1580         struct qib_ctxtdata *rcd = ctxt_fp(fp);
1581         struct qib_devdata *dd;
1582         unsigned uctxt;
1583
1584         /* Subctxts don't need to initialize anything since master did it. */
1585         if (subctxt_fp(fp)) {
1586                 ret = wait_event_interruptible(rcd->wait,
1587                         !test_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag));
1588                 goto bail;
1589         }
1590
1591         dd = rcd->dd;
1592
1593         /* some ctxts may get extra buffers, calculate that here */
1594         uctxt = rcd->ctxt - dd->first_user_ctxt;
1595         if (uctxt < dd->ctxts_extrabuf) {
1596                 rcd->piocnt = dd->pbufsctxt + 1;
1597                 rcd->pio_base = rcd->piocnt * uctxt;
1598         } else {
1599                 rcd->piocnt = dd->pbufsctxt;
1600                 rcd->pio_base = rcd->piocnt * uctxt +
1601                         dd->ctxts_extrabuf;
1602         }
1603
1604         /*
1605          * All user buffers are 2KB buffers.  If we ever support
1606          * giving 4KB buffers to user processes, this will need some
1607          * work.  Can't use piobufbase directly, because it has
1608          * both 2K and 4K buffer base values.  So check and handle.
1609          */
1610         if ((rcd->pio_base + rcd->piocnt) > dd->piobcnt2k) {
1611                 if (rcd->pio_base >= dd->piobcnt2k) {
1612                         qib_dev_err(dd,
1613                                     "%u:ctxt%u: no 2KB buffers available\n",
1614                                     dd->unit, rcd->ctxt);
1615                         ret = -ENOBUFS;
1616                         goto bail;
1617                 }
1618                 rcd->piocnt = dd->piobcnt2k - rcd->pio_base;
1619                 qib_dev_err(dd, "Ctxt%u: would use 4KB bufs, using %u\n",
1620                             rcd->ctxt, rcd->piocnt);
1621         }
1622
1623         rcd->piobufs = dd->pio2k_bufbase + rcd->pio_base * dd->palign;
1624         qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt,
1625                                TXCHK_CHG_TYPE_USER, rcd);
1626         /*
1627          * try to ensure that processes start up with consistent avail update
1628          * for their own range, at least.   If system very quiet, it might
1629          * have the in-memory copy out of date at startup for this range of
1630          * buffers, when a context gets re-used.  Do after the chg_pioavail
1631          * and before the rest of setup, so it's "almost certain" the dma
1632          * will have occurred (can't 100% guarantee, but should be many
1633          * decimals of 9s, with this ordering), given how much else happens
1634          * after this.
1635          */
1636         dd->f_sendctrl(dd->pport, QIB_SENDCTRL_AVAIL_BLIP);
1637
1638         /*
1639          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1640          * array for time being.  If rcd->ctxt > chip-supported,
1641          * we need to do extra stuff here to handle by handling overflow
1642          * through ctxt 0, someday
1643          */
1644         ret = qib_create_rcvhdrq(dd, rcd);
1645         if (!ret)
1646                 ret = qib_setup_eagerbufs(rcd);
1647         if (ret)
1648                 goto bail_pio;
1649
1650         rcd->tidcursor = 0; /* start at beginning after open */
1651
1652         /* initialize poll variables... */
1653         rcd->urgent = 0;
1654         rcd->urgent_poll = 0;
1655
1656         /*
1657          * Now enable the ctxt for receive.
1658          * For chips that are set to DMA the tail register to memory
1659          * when they change (and when the update bit transitions from
1660          * 0 to 1.  So for those chips, we turn it off and then back on.
1661          * This will (very briefly) affect any other open ctxts, but the
1662          * duration is very short, and therefore isn't an issue.  We
1663          * explicitly set the in-memory tail copy to 0 beforehand, so we
1664          * don't have to wait to be sure the DMA update has happened
1665          * (chip resets head/tail to 0 on transition to enable).
1666          */
1667         if (rcd->rcvhdrtail_kvaddr)
1668                 qib_clear_rcvhdrtail(rcd);
1669
1670         dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_TIDFLOW_ENB,
1671                       rcd->ctxt);
1672
1673         /* Notify any waiting slaves */
1674         if (rcd->subctxt_cnt) {
1675                 clear_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag);
1676                 wake_up(&rcd->wait);
1677         }
1678         return 0;
1679
1680 bail_pio:
1681         qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt,
1682                                TXCHK_CHG_TYPE_KERN, rcd);
1683 bail:
1684         return ret;
1685 }
1686
1687 /**
1688  * unlock_exptid - unlock any expected TID entries context still had in use
1689  * @rcd: ctxt
1690  *
1691  * We don't actually update the chip here, because we do a bulk update
1692  * below, using f_clear_tids.
1693  */
1694 static void unlock_expected_tids(struct qib_ctxtdata *rcd)
1695 {
1696         struct qib_devdata *dd = rcd->dd;
1697         int ctxt_tidbase = rcd->ctxt * dd->rcvtidcnt;
1698         int i, cnt = 0, maxtid = ctxt_tidbase + dd->rcvtidcnt;
1699
1700         for (i = ctxt_tidbase; i < maxtid; i++) {
1701                 struct page *p = dd->pageshadow[i];
1702                 dma_addr_t phys;
1703
1704                 if (!p)
1705                         continue;
1706
1707                 phys = dd->physshadow[i];
1708                 dd->physshadow[i] = dd->tidinvalid;
1709                 dd->pageshadow[i] = NULL;
1710                 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
1711                                PCI_DMA_FROMDEVICE);
1712                 qib_release_user_pages(&p, 1);
1713                 cnt++;
1714         }
1715 }
1716
1717 static int qib_close(struct inode *in, struct file *fp)
1718 {
1719         int ret = 0;
1720         struct qib_filedata *fd;
1721         struct qib_ctxtdata *rcd;
1722         struct qib_devdata *dd;
1723         unsigned long flags;
1724         unsigned ctxt;
1725         pid_t pid;
1726
1727         mutex_lock(&qib_mutex);
1728
1729         fd = fp->private_data;
1730         fp->private_data = NULL;
1731         rcd = fd->rcd;
1732         if (!rcd) {
1733                 mutex_unlock(&qib_mutex);
1734                 goto bail;
1735         }
1736
1737         dd = rcd->dd;
1738
1739         /* ensure all pio buffer writes in progress are flushed */
1740         qib_flush_wc();
1741
1742         /* drain user sdma queue */
1743         if (fd->pq) {
1744                 qib_user_sdma_queue_drain(rcd->ppd, fd->pq);
1745                 qib_user_sdma_queue_destroy(fd->pq);
1746         }
1747
1748         if (fd->rec_cpu_num != -1)
1749                 __clear_bit(fd->rec_cpu_num, qib_cpulist);
1750
1751         if (--rcd->cnt) {
1752                 /*
1753                  * XXX If the master closes the context before the slave(s),
1754                  * revoke the mmap for the eager receive queue so
1755                  * the slave(s) don't wait for receive data forever.
1756                  */
1757                 rcd->active_slaves &= ~(1 << fd->subctxt);
1758                 rcd->subpid[fd->subctxt] = 0;
1759                 mutex_unlock(&qib_mutex);
1760                 goto bail;
1761         }
1762
1763         /* early; no interrupt users after this */
1764         spin_lock_irqsave(&dd->uctxt_lock, flags);
1765         ctxt = rcd->ctxt;
1766         dd->rcd[ctxt] = NULL;
1767         pid = rcd->pid;
1768         rcd->pid = 0;
1769         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1770
1771         if (rcd->rcvwait_to || rcd->piowait_to ||
1772             rcd->rcvnowait || rcd->pionowait) {
1773                 rcd->rcvwait_to = 0;
1774                 rcd->piowait_to = 0;
1775                 rcd->rcvnowait = 0;
1776                 rcd->pionowait = 0;
1777         }
1778         if (rcd->flag)
1779                 rcd->flag = 0;
1780
1781         if (dd->kregbase) {
1782                 /* atomically clear receive enable ctxt and intr avail. */
1783                 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_DIS |
1784                                   QIB_RCVCTRL_INTRAVAIL_DIS, ctxt);
1785
1786                 /* clean up the pkeys for this ctxt user */
1787                 qib_clean_part_key(rcd, dd);
1788                 qib_disarm_piobufs(dd, rcd->pio_base, rcd->piocnt);
1789                 qib_chg_pioavailkernel(dd, rcd->pio_base,
1790                                        rcd->piocnt, TXCHK_CHG_TYPE_KERN, NULL);
1791
1792                 dd->f_clear_tids(dd, rcd);
1793
1794                 if (dd->pageshadow)
1795                         unlock_expected_tids(rcd);
1796                 qib_stats.sps_ctxts--;
1797                 dd->freectxts++;
1798         }
1799
1800         mutex_unlock(&qib_mutex);
1801         qib_free_ctxtdata(dd, rcd); /* after releasing the mutex */
1802
1803 bail:
1804         kfree(fd);
1805         return ret;
1806 }
1807
1808 static int qib_ctxt_info(struct file *fp, struct qib_ctxt_info __user *uinfo)
1809 {
1810         struct qib_ctxt_info info;
1811         int ret;
1812         size_t sz;
1813         struct qib_ctxtdata *rcd = ctxt_fp(fp);
1814         struct qib_filedata *fd;
1815
1816         fd = fp->private_data;
1817
1818         info.num_active = qib_count_active_units();
1819         info.unit = rcd->dd->unit;
1820         info.port = rcd->ppd->port;
1821         info.ctxt = rcd->ctxt;
1822         info.subctxt =  subctxt_fp(fp);
1823         /* Number of user ctxts available for this device. */
1824         info.num_ctxts = rcd->dd->cfgctxts - rcd->dd->first_user_ctxt;
1825         info.num_subctxts = rcd->subctxt_cnt;
1826         info.rec_cpu = fd->rec_cpu_num;
1827         sz = sizeof(info);
1828
1829         if (copy_to_user(uinfo, &info, sz)) {
1830                 ret = -EFAULT;
1831                 goto bail;
1832         }
1833         ret = 0;
1834
1835 bail:
1836         return ret;
1837 }
1838
1839 static int qib_sdma_get_inflight(struct qib_user_sdma_queue *pq,
1840                                  u32 __user *inflightp)
1841 {
1842         const u32 val = qib_user_sdma_inflight_counter(pq);
1843
1844         if (put_user(val, inflightp))
1845                 return -EFAULT;
1846
1847         return 0;
1848 }
1849
1850 static int qib_sdma_get_complete(struct qib_pportdata *ppd,
1851                                  struct qib_user_sdma_queue *pq,
1852                                  u32 __user *completep)
1853 {
1854         u32 val;
1855         int err;
1856
1857         if (!pq)
1858                 return -EINVAL;
1859
1860         err = qib_user_sdma_make_progress(ppd, pq);
1861         if (err < 0)
1862                 return err;
1863
1864         val = qib_user_sdma_complete_counter(pq);
1865         if (put_user(val, completep))
1866                 return -EFAULT;
1867
1868         return 0;
1869 }
1870
1871 static int disarm_req_delay(struct qib_ctxtdata *rcd)
1872 {
1873         int ret = 0;
1874
1875         if (!usable(rcd->ppd)) {
1876                 int i;
1877                 /*
1878                  * if link is down, or otherwise not usable, delay
1879                  * the caller up to 30 seconds, so we don't thrash
1880                  * in trying to get the chip back to ACTIVE, and
1881                  * set flag so they make the call again.
1882                  */
1883                 if (rcd->user_event_mask) {
1884                         /*
1885                          * subctxt_cnt is 0 if not shared, so do base
1886                          * separately, first, then remaining subctxt, if any
1887                          */
1888                         set_bit(_QIB_EVENT_DISARM_BUFS_BIT,
1889                                 &rcd->user_event_mask[0]);
1890                         for (i = 1; i < rcd->subctxt_cnt; i++)
1891                                 set_bit(_QIB_EVENT_DISARM_BUFS_BIT,
1892                                         &rcd->user_event_mask[i]);
1893                 }
1894                 for (i = 0; !usable(rcd->ppd) && i < 300; i++)
1895                         msleep(100);
1896                 ret = -ENETDOWN;
1897         }
1898         return ret;
1899 }
1900
1901 /*
1902  * Find all user contexts in use, and set the specified bit in their
1903  * event mask.
1904  * See also find_ctxt() for a similar use, that is specific to send buffers.
1905  */
1906 int qib_set_uevent_bits(struct qib_pportdata *ppd, const int evtbit)
1907 {
1908         struct qib_ctxtdata *rcd;
1909         unsigned ctxt;
1910         int ret = 0;
1911         unsigned long flags;
1912
1913         spin_lock_irqsave(&ppd->dd->uctxt_lock, flags);
1914         for (ctxt = ppd->dd->first_user_ctxt; ctxt < ppd->dd->cfgctxts;
1915              ctxt++) {
1916                 rcd = ppd->dd->rcd[ctxt];
1917                 if (!rcd)
1918                         continue;
1919                 if (rcd->user_event_mask) {
1920                         int i;
1921                         /*
1922                          * subctxt_cnt is 0 if not shared, so do base
1923                          * separately, first, then remaining subctxt, if any
1924                          */
1925                         set_bit(evtbit, &rcd->user_event_mask[0]);
1926                         for (i = 1; i < rcd->subctxt_cnt; i++)
1927                                 set_bit(evtbit, &rcd->user_event_mask[i]);
1928                 }
1929                 ret = 1;
1930                 break;
1931         }
1932         spin_unlock_irqrestore(&ppd->dd->uctxt_lock, flags);
1933
1934         return ret;
1935 }
1936
1937 /*
1938  * clear the event notifier events for this context.
1939  * For the DISARM_BUFS case, we also take action (this obsoletes
1940  * the older QIB_CMD_DISARM_BUFS, but we keep it for backwards
1941  * compatibility.
1942  * Other bits don't currently require actions, just atomically clear.
1943  * User process then performs actions appropriate to bit having been
1944  * set, if desired, and checks again in future.
1945  */
1946 static int qib_user_event_ack(struct qib_ctxtdata *rcd, int subctxt,
1947                               unsigned long events)
1948 {
1949         int ret = 0, i;
1950
1951         for (i = 0; i <= _QIB_MAX_EVENT_BIT; i++) {
1952                 if (!test_bit(i, &events))
1953                         continue;
1954                 if (i == _QIB_EVENT_DISARM_BUFS_BIT) {
1955                         (void)qib_disarm_piobufs_ifneeded(rcd);
1956                         ret = disarm_req_delay(rcd);
1957                 } else
1958                         clear_bit(i, &rcd->user_event_mask[subctxt]);
1959         }
1960         return ret;
1961 }
1962
1963 static ssize_t qib_write(struct file *fp, const char __user *data,
1964                          size_t count, loff_t *off)
1965 {
1966         const struct qib_cmd __user *ucmd;
1967         struct qib_ctxtdata *rcd;
1968         const void __user *src;
1969         size_t consumed, copy = 0;
1970         struct qib_cmd cmd;
1971         ssize_t ret = 0;
1972         void *dest;
1973
1974         if (count < sizeof(cmd.type)) {
1975                 ret = -EINVAL;
1976                 goto bail;
1977         }
1978
1979         ucmd = (const struct qib_cmd __user *) data;
1980
1981         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1982                 ret = -EFAULT;
1983                 goto bail;
1984         }
1985
1986         consumed = sizeof(cmd.type);
1987
1988         switch (cmd.type) {
1989         case QIB_CMD_ASSIGN_CTXT:
1990         case QIB_CMD_USER_INIT:
1991                 copy = sizeof(cmd.cmd.user_info);
1992                 dest = &cmd.cmd.user_info;
1993                 src = &ucmd->cmd.user_info;
1994                 break;
1995
1996         case QIB_CMD_RECV_CTRL:
1997                 copy = sizeof(cmd.cmd.recv_ctrl);
1998                 dest = &cmd.cmd.recv_ctrl;
1999                 src = &ucmd->cmd.recv_ctrl;
2000                 break;
2001
2002         case QIB_CMD_CTXT_INFO:
2003                 copy = sizeof(cmd.cmd.ctxt_info);
2004                 dest = &cmd.cmd.ctxt_info;
2005                 src = &ucmd->cmd.ctxt_info;
2006                 break;
2007
2008         case QIB_CMD_TID_UPDATE:
2009         case QIB_CMD_TID_FREE:
2010                 copy = sizeof(cmd.cmd.tid_info);
2011                 dest = &cmd.cmd.tid_info;
2012                 src = &ucmd->cmd.tid_info;
2013                 break;
2014
2015         case QIB_CMD_SET_PART_KEY:
2016                 copy = sizeof(cmd.cmd.part_key);
2017                 dest = &cmd.cmd.part_key;
2018                 src = &ucmd->cmd.part_key;
2019                 break;
2020
2021         case QIB_CMD_DISARM_BUFS:
2022         case QIB_CMD_PIOAVAILUPD: /* force an update of PIOAvail reg */
2023                 copy = 0;
2024                 src = NULL;
2025                 dest = NULL;
2026                 break;
2027
2028         case QIB_CMD_POLL_TYPE:
2029                 copy = sizeof(cmd.cmd.poll_type);
2030                 dest = &cmd.cmd.poll_type;
2031                 src = &ucmd->cmd.poll_type;
2032                 break;
2033
2034         case QIB_CMD_ARMLAUNCH_CTRL:
2035                 copy = sizeof(cmd.cmd.armlaunch_ctrl);
2036                 dest = &cmd.cmd.armlaunch_ctrl;
2037                 src = &ucmd->cmd.armlaunch_ctrl;
2038                 break;
2039
2040         case QIB_CMD_SDMA_INFLIGHT:
2041                 copy = sizeof(cmd.cmd.sdma_inflight);
2042                 dest = &cmd.cmd.sdma_inflight;
2043                 src = &ucmd->cmd.sdma_inflight;
2044                 break;
2045
2046         case QIB_CMD_SDMA_COMPLETE:
2047                 copy = sizeof(cmd.cmd.sdma_complete);
2048                 dest = &cmd.cmd.sdma_complete;
2049                 src = &ucmd->cmd.sdma_complete;
2050                 break;
2051
2052         case QIB_CMD_ACK_EVENT:
2053                 copy = sizeof(cmd.cmd.event_mask);
2054                 dest = &cmd.cmd.event_mask;
2055                 src = &ucmd->cmd.event_mask;
2056                 break;
2057
2058         default:
2059                 ret = -EINVAL;
2060                 goto bail;
2061         }
2062
2063         if (copy) {
2064                 if ((count - consumed) < copy) {
2065                         ret = -EINVAL;
2066                         goto bail;
2067                 }
2068                 if (copy_from_user(dest, src, copy)) {
2069                         ret = -EFAULT;
2070                         goto bail;
2071                 }
2072                 consumed += copy;
2073         }
2074
2075         rcd = ctxt_fp(fp);
2076         if (!rcd && cmd.type != QIB_CMD_ASSIGN_CTXT) {
2077                 ret = -EINVAL;
2078                 goto bail;
2079         }
2080
2081         switch (cmd.type) {
2082         case QIB_CMD_ASSIGN_CTXT:
2083                 ret = qib_assign_ctxt(fp, &cmd.cmd.user_info);
2084                 if (ret)
2085                         goto bail;
2086                 break;
2087
2088         case QIB_CMD_USER_INIT:
2089                 ret = qib_do_user_init(fp, &cmd.cmd.user_info);
2090                 if (ret)
2091                         goto bail;
2092                 ret = qib_get_base_info(fp, (void __user *) (unsigned long)
2093                                         cmd.cmd.user_info.spu_base_info,
2094                                         cmd.cmd.user_info.spu_base_info_size);
2095                 break;
2096
2097         case QIB_CMD_RECV_CTRL:
2098                 ret = qib_manage_rcvq(rcd, subctxt_fp(fp), cmd.cmd.recv_ctrl);
2099                 break;
2100
2101         case QIB_CMD_CTXT_INFO:
2102                 ret = qib_ctxt_info(fp, (struct qib_ctxt_info __user *)
2103                                     (unsigned long) cmd.cmd.ctxt_info);
2104                 break;
2105
2106         case QIB_CMD_TID_UPDATE:
2107                 ret = qib_tid_update(rcd, fp, &cmd.cmd.tid_info);
2108                 break;
2109
2110         case QIB_CMD_TID_FREE:
2111                 ret = qib_tid_free(rcd, subctxt_fp(fp), &cmd.cmd.tid_info);
2112                 break;
2113
2114         case QIB_CMD_SET_PART_KEY:
2115                 ret = qib_set_part_key(rcd, cmd.cmd.part_key);
2116                 break;
2117
2118         case QIB_CMD_DISARM_BUFS:
2119                 (void)qib_disarm_piobufs_ifneeded(rcd);
2120                 ret = disarm_req_delay(rcd);
2121                 break;
2122
2123         case QIB_CMD_PIOAVAILUPD:
2124                 qib_force_pio_avail_update(rcd->dd);
2125                 break;
2126
2127         case QIB_CMD_POLL_TYPE:
2128                 rcd->poll_type = cmd.cmd.poll_type;
2129                 break;
2130
2131         case QIB_CMD_ARMLAUNCH_CTRL:
2132                 rcd->dd->f_set_armlaunch(rcd->dd, cmd.cmd.armlaunch_ctrl);
2133                 break;
2134
2135         case QIB_CMD_SDMA_INFLIGHT:
2136                 ret = qib_sdma_get_inflight(user_sdma_queue_fp(fp),
2137                                             (u32 __user *) (unsigned long)
2138                                             cmd.cmd.sdma_inflight);
2139                 break;
2140
2141         case QIB_CMD_SDMA_COMPLETE:
2142                 ret = qib_sdma_get_complete(rcd->ppd,
2143                                             user_sdma_queue_fp(fp),
2144                                             (u32 __user *) (unsigned long)
2145                                             cmd.cmd.sdma_complete);
2146                 break;
2147
2148         case QIB_CMD_ACK_EVENT:
2149                 ret = qib_user_event_ack(rcd, subctxt_fp(fp),
2150                                          cmd.cmd.event_mask);
2151                 break;
2152         }
2153
2154         if (ret >= 0)
2155                 ret = consumed;
2156
2157 bail:
2158         return ret;
2159 }
2160
2161 static ssize_t qib_aio_write(struct kiocb *iocb, const struct iovec *iov,
2162                              unsigned long dim, loff_t off)
2163 {
2164         struct qib_filedata *fp = iocb->ki_filp->private_data;
2165         struct qib_ctxtdata *rcd = ctxt_fp(iocb->ki_filp);
2166         struct qib_user_sdma_queue *pq = fp->pq;
2167
2168         if (!dim || !pq)
2169                 return -EINVAL;
2170
2171         return qib_user_sdma_writev(rcd, pq, iov, dim);
2172 }
2173
2174 static struct class *qib_class;
2175 static dev_t qib_dev;
2176
2177 int qib_cdev_init(int minor, const char *name,
2178                   const struct file_operations *fops,
2179                   struct cdev **cdevp, struct device **devp)
2180 {
2181         const dev_t dev = MKDEV(MAJOR(qib_dev), minor);
2182         struct cdev *cdev;
2183         struct device *device = NULL;
2184         int ret;
2185
2186         cdev = cdev_alloc();
2187         if (!cdev) {
2188                 printk(KERN_ERR QIB_DRV_NAME
2189                        ": Could not allocate cdev for minor %d, %s\n",
2190                        minor, name);
2191                 ret = -ENOMEM;
2192                 goto done;
2193         }
2194
2195         cdev->owner = THIS_MODULE;
2196         cdev->ops = fops;
2197         kobject_set_name(&cdev->kobj, name);
2198
2199         ret = cdev_add(cdev, dev, 1);
2200         if (ret < 0) {
2201                 printk(KERN_ERR QIB_DRV_NAME
2202                        ": Could not add cdev for minor %d, %s (err %d)\n",
2203                        minor, name, -ret);
2204                 goto err_cdev;
2205         }
2206
2207         device = device_create(qib_class, NULL, dev, NULL, name);
2208         if (!IS_ERR(device))
2209                 goto done;
2210         ret = PTR_ERR(device);
2211         device = NULL;
2212         printk(KERN_ERR QIB_DRV_NAME ": Could not create "
2213                "device for minor %d, %s (err %d)\n",
2214                minor, name, -ret);
2215 err_cdev:
2216         cdev_del(cdev);
2217         cdev = NULL;
2218 done:
2219         *cdevp = cdev;
2220         *devp = device;
2221         return ret;
2222 }
2223
2224 void qib_cdev_cleanup(struct cdev **cdevp, struct device **devp)
2225 {
2226         struct device *device = *devp;
2227
2228         if (device) {
2229                 device_unregister(device);
2230                 *devp = NULL;
2231         }
2232
2233         if (*cdevp) {
2234                 cdev_del(*cdevp);
2235                 *cdevp = NULL;
2236         }
2237 }
2238
2239 static struct cdev *wildcard_cdev;
2240 static struct device *wildcard_device;
2241
2242 int __init qib_dev_init(void)
2243 {
2244         int ret;
2245
2246         ret = alloc_chrdev_region(&qib_dev, 0, QIB_NMINORS, QIB_DRV_NAME);
2247         if (ret < 0) {
2248                 printk(KERN_ERR QIB_DRV_NAME ": Could not allocate "
2249                        "chrdev region (err %d)\n", -ret);
2250                 goto done;
2251         }
2252
2253         qib_class = class_create(THIS_MODULE, "ipath");
2254         if (IS_ERR(qib_class)) {
2255                 ret = PTR_ERR(qib_class);
2256                 printk(KERN_ERR QIB_DRV_NAME ": Could not create "
2257                        "device class (err %d)\n", -ret);
2258                 unregister_chrdev_region(qib_dev, QIB_NMINORS);
2259         }
2260
2261 done:
2262         return ret;
2263 }
2264
2265 void qib_dev_cleanup(void)
2266 {
2267         if (qib_class) {
2268                 class_destroy(qib_class);
2269                 qib_class = NULL;
2270         }
2271
2272         unregister_chrdev_region(qib_dev, QIB_NMINORS);
2273 }
2274
2275 static atomic_t user_count = ATOMIC_INIT(0);
2276
2277 static void qib_user_remove(struct qib_devdata *dd)
2278 {
2279         if (atomic_dec_return(&user_count) == 0)
2280                 qib_cdev_cleanup(&wildcard_cdev, &wildcard_device);
2281
2282         qib_cdev_cleanup(&dd->user_cdev, &dd->user_device);
2283 }
2284
2285 static int qib_user_add(struct qib_devdata *dd)
2286 {
2287         char name[10];
2288         int ret;
2289
2290         if (atomic_inc_return(&user_count) == 1) {
2291                 ret = qib_cdev_init(0, "ipath", &qib_file_ops,
2292                                     &wildcard_cdev, &wildcard_device);
2293                 if (ret)
2294                         goto done;
2295         }
2296
2297         snprintf(name, sizeof(name), "ipath%d", dd->unit);
2298         ret = qib_cdev_init(dd->unit + 1, name, &qib_file_ops,
2299                             &dd->user_cdev, &dd->user_device);
2300         if (ret)
2301                 qib_user_remove(dd);
2302 done:
2303         return ret;
2304 }
2305
2306 /*
2307  * Create per-unit files in /dev
2308  */
2309 int qib_device_create(struct qib_devdata *dd)
2310 {
2311         int r, ret;
2312
2313         r = qib_user_add(dd);
2314         ret = qib_diag_add(dd);
2315         if (r && !ret)
2316                 ret = r;
2317         return ret;
2318 }
2319
2320 /*
2321  * Remove per-unit files in /dev
2322  * void, core kernel returns no errors for this stuff
2323  */
2324 void qib_device_remove(struct qib_devdata *dd)
2325 {
2326         qib_user_remove(dd);
2327         qib_diag_remove(dd);
2328 }