IB/ipath: Make ipath_portdata work with struct pid * not pid_t
[linux-2.6.git] / drivers / infiniband / hw / ipath / ipath_file_ops.c
1 /*
2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33
34 #include <linux/pci.h>
35 #include <linux/poll.h>
36 #include <linux/cdev.h>
37 #include <linux/swap.h>
38 #include <linux/vmalloc.h>
39 #include <linux/highmem.h>
40 #include <linux/io.h>
41 #include <linux/jiffies.h>
42 #include <asm/pgtable.h>
43
44 #include "ipath_kernel.h"
45 #include "ipath_common.h"
46 #include "ipath_user_sdma.h"
47
48 static int ipath_open(struct inode *, struct file *);
49 static int ipath_close(struct inode *, struct file *);
50 static ssize_t ipath_write(struct file *, const char __user *, size_t,
51                            loff_t *);
52 static ssize_t ipath_writev(struct kiocb *, const struct iovec *,
53                             unsigned long , loff_t);
54 static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
55 static int ipath_mmap(struct file *, struct vm_area_struct *);
56
57 static const struct file_operations ipath_file_ops = {
58         .owner = THIS_MODULE,
59         .write = ipath_write,
60         .aio_write = ipath_writev,
61         .open = ipath_open,
62         .release = ipath_close,
63         .poll = ipath_poll,
64         .mmap = ipath_mmap
65 };
66
67 /*
68  * Convert kernel virtual addresses to physical addresses so they don't
69  * potentially conflict with the chip addresses used as mmap offsets.
70  * It doesn't really matter what mmap offset we use as long as we can
71  * interpret it correctly.
72  */
73 static u64 cvt_kvaddr(void *p)
74 {
75         struct page *page;
76         u64 paddr = 0;
77
78         page = vmalloc_to_page(p);
79         if (page)
80                 paddr = page_to_pfn(page) << PAGE_SHIFT;
81
82         return paddr;
83 }
84
85 static int ipath_get_base_info(struct file *fp,
86                                void __user *ubase, size_t ubase_size)
87 {
88         struct ipath_portdata *pd = port_fp(fp);
89         int ret = 0;
90         struct ipath_base_info *kinfo = NULL;
91         struct ipath_devdata *dd = pd->port_dd;
92         unsigned subport_cnt;
93         int shared, master;
94         size_t sz;
95
96         subport_cnt = pd->port_subport_cnt;
97         if (!subport_cnt) {
98                 shared = 0;
99                 master = 0;
100                 subport_cnt = 1;
101         } else {
102                 shared = 1;
103                 master = !subport_fp(fp);
104         }
105
106         sz = sizeof(*kinfo);
107         /* If port sharing is not requested, allow the old size structure */
108         if (!shared)
109                 sz -= 7 * sizeof(u64);
110         if (ubase_size < sz) {
111                 ipath_cdbg(PROC,
112                            "Base size %zu, need %zu (version mismatch?)\n",
113                            ubase_size, sz);
114                 ret = -EINVAL;
115                 goto bail;
116         }
117
118         kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
119         if (kinfo == NULL) {
120                 ret = -ENOMEM;
121                 goto bail;
122         }
123
124         ret = dd->ipath_f_get_base_info(pd, kinfo);
125         if (ret < 0)
126                 goto bail;
127
128         kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
129         kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
130         kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
131         kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
132         /*
133          * have to mmap whole thing
134          */
135         kinfo->spi_rcv_egrbuftotlen =
136                 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
137         kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
138         kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
139                 pd->port_rcvegrbuf_chunks;
140         kinfo->spi_tidcnt = dd->ipath_rcvtidcnt / subport_cnt;
141         if (master)
142                 kinfo->spi_tidcnt += dd->ipath_rcvtidcnt % subport_cnt;
143         /*
144          * for this use, may be ipath_cfgports summed over all chips that
145          * are are configured and present
146          */
147         kinfo->spi_nports = dd->ipath_cfgports;
148         /* unit (chip/board) our port is on */
149         kinfo->spi_unit = dd->ipath_unit;
150         /* for now, only a single page */
151         kinfo->spi_tid_maxsize = PAGE_SIZE;
152
153         /*
154          * Doing this per port, and based on the skip value, etc.  This has
155          * to be the actual buffer size, since the protocol code treats it
156          * as an array.
157          *
158          * These have to be set to user addresses in the user code via mmap.
159          * These values are used on return to user code for the mmap target
160          * addresses only.  For 32 bit, same 44 bit address problem, so use
161          * the physical address, not virtual.  Before 2.6.11, using the
162          * page_address() macro worked, but in 2.6.11, even that returns the
163          * full 64 bit address (upper bits all 1's).  So far, using the
164          * physical addresses (or chip offsets, for chip mapping) works, but
165          * no doubt some future kernel release will change that, and we'll be
166          * on to yet another method of dealing with this.
167          */
168         kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
169         kinfo->spi_rcvhdr_tailaddr = (u64) pd->port_rcvhdrqtailaddr_phys;
170         kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
171         kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
172         kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
173                 (void *) dd->ipath_statusp -
174                 (void *) dd->ipath_pioavailregs_dma;
175         if (!shared) {
176                 kinfo->spi_piocnt = pd->port_piocnt;
177                 kinfo->spi_piobufbase = (u64) pd->port_piobufs;
178                 kinfo->__spi_uregbase = (u64) dd->ipath_uregbase +
179                         dd->ipath_ureg_align * pd->port_port;
180         } else if (master) {
181                 kinfo->spi_piocnt = (pd->port_piocnt / subport_cnt) +
182                                     (pd->port_piocnt % subport_cnt);
183                 /* Master's PIO buffers are after all the slave's */
184                 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
185                         dd->ipath_palign *
186                         (pd->port_piocnt - kinfo->spi_piocnt);
187         } else {
188                 unsigned slave = subport_fp(fp) - 1;
189
190                 kinfo->spi_piocnt = pd->port_piocnt / subport_cnt;
191                 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
192                         dd->ipath_palign * kinfo->spi_piocnt * slave;
193         }
194
195         if (shared) {
196                 kinfo->spi_port_uregbase = (u64) dd->ipath_uregbase +
197                         dd->ipath_ureg_align * pd->port_port;
198                 kinfo->spi_port_rcvegrbuf = kinfo->spi_rcv_egrbufs;
199                 kinfo->spi_port_rcvhdr_base = kinfo->spi_rcvhdr_base;
200                 kinfo->spi_port_rcvhdr_tailaddr = kinfo->spi_rcvhdr_tailaddr;
201
202                 kinfo->__spi_uregbase = cvt_kvaddr(pd->subport_uregbase +
203                         PAGE_SIZE * subport_fp(fp));
204
205                 kinfo->spi_rcvhdr_base = cvt_kvaddr(pd->subport_rcvhdr_base +
206                         pd->port_rcvhdrq_size * subport_fp(fp));
207                 kinfo->spi_rcvhdr_tailaddr = 0;
208                 kinfo->spi_rcv_egrbufs = cvt_kvaddr(pd->subport_rcvegrbuf +
209                         pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size *
210                         subport_fp(fp));
211
212                 kinfo->spi_subport_uregbase =
213                         cvt_kvaddr(pd->subport_uregbase);
214                 kinfo->spi_subport_rcvegrbuf =
215                         cvt_kvaddr(pd->subport_rcvegrbuf);
216                 kinfo->spi_subport_rcvhdr_base =
217                         cvt_kvaddr(pd->subport_rcvhdr_base);
218                 ipath_cdbg(PROC, "port %u flags %x %llx %llx %llx\n",
219                         kinfo->spi_port, kinfo->spi_runtime_flags,
220                         (unsigned long long) kinfo->spi_subport_uregbase,
221                         (unsigned long long) kinfo->spi_subport_rcvegrbuf,
222                         (unsigned long long) kinfo->spi_subport_rcvhdr_base);
223         }
224
225         kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->ipath_piobufbase) /
226                 dd->ipath_palign;
227         kinfo->spi_pioalign = dd->ipath_palign;
228
229         kinfo->spi_qpair = IPATH_KD_QP;
230         /*
231          * user mode PIO buffers are always 2KB, even when 4KB can
232          * be received, and sent via the kernel; this is ibmaxlen
233          * for 2K MTU.
234          */
235         kinfo->spi_piosize = dd->ipath_piosize2k - 2 * sizeof(u32);
236         kinfo->spi_mtu = dd->ipath_ibmaxlen;    /* maxlen, not ibmtu */
237         kinfo->spi_port = pd->port_port;
238         kinfo->spi_subport = subport_fp(fp);
239         kinfo->spi_sw_version = IPATH_KERN_SWVERSION;
240         kinfo->spi_hw_version = dd->ipath_revision;
241
242         if (master) {
243                 kinfo->spi_runtime_flags |= IPATH_RUNTIME_MASTER;
244         }
245
246         sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
247         if (copy_to_user(ubase, kinfo, sz))
248                 ret = -EFAULT;
249
250 bail:
251         kfree(kinfo);
252         return ret;
253 }
254
255 /**
256  * ipath_tid_update - update a port TID
257  * @pd: the port
258  * @fp: the ipath device file
259  * @ti: the TID information
260  *
261  * The new implementation as of Oct 2004 is that the driver assigns
262  * the tid and returns it to the caller.   To make it easier to
263  * catch bugs, and to reduce search time, we keep a cursor for
264  * each port, walking the shadow tid array to find one that's not
265  * in use.
266  *
267  * For now, if we can't allocate the full list, we fail, although
268  * in the long run, we'll allocate as many as we can, and the
269  * caller will deal with that by trying the remaining pages later.
270  * That means that when we fail, we have to mark the tids as not in
271  * use again, in our shadow copy.
272  *
273  * It's up to the caller to free the tids when they are done.
274  * We'll unlock the pages as they free them.
275  *
276  * Also, right now we are locking one page at a time, but since
277  * the intended use of this routine is for a single group of
278  * virtually contiguous pages, that should change to improve
279  * performance.
280  */
281 static int ipath_tid_update(struct ipath_portdata *pd, struct file *fp,
282                             const struct ipath_tid_info *ti)
283 {
284         int ret = 0, ntids;
285         u32 tid, porttid, cnt, i, tidcnt, tidoff;
286         u16 *tidlist;
287         struct ipath_devdata *dd = pd->port_dd;
288         u64 physaddr;
289         unsigned long vaddr;
290         u64 __iomem *tidbase;
291         unsigned long tidmap[8];
292         struct page **pagep = NULL;
293         unsigned subport = subport_fp(fp);
294
295         if (!dd->ipath_pageshadow) {
296                 ret = -ENOMEM;
297                 goto done;
298         }
299
300         cnt = ti->tidcnt;
301         if (!cnt) {
302                 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
303                           (unsigned long long) ti->tidlist);
304                 /*
305                  * Should we treat as success?  likely a bug
306                  */
307                 ret = -EFAULT;
308                 goto done;
309         }
310         porttid = pd->port_port * dd->ipath_rcvtidcnt;
311         if (!pd->port_subport_cnt) {
312                 tidcnt = dd->ipath_rcvtidcnt;
313                 tid = pd->port_tidcursor;
314                 tidoff = 0;
315         } else if (!subport) {
316                 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
317                          (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
318                 tidoff = dd->ipath_rcvtidcnt - tidcnt;
319                 porttid += tidoff;
320                 tid = tidcursor_fp(fp);
321         } else {
322                 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
323                 tidoff = tidcnt * (subport - 1);
324                 porttid += tidoff;
325                 tid = tidcursor_fp(fp);
326         }
327         if (cnt > tidcnt) {
328                 /* make sure it all fits in port_tid_pg_list */
329                 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
330                          "TIDs, only trying max (%u)\n", cnt, tidcnt);
331                 cnt = tidcnt;
332         }
333         pagep = &((struct page **) pd->port_tid_pg_list)[tidoff];
334         tidlist = &((u16 *) &pagep[dd->ipath_rcvtidcnt])[tidoff];
335
336         memset(tidmap, 0, sizeof(tidmap));
337         /* before decrement; chip actual # */
338         ntids = tidcnt;
339         tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
340                                    dd->ipath_rcvtidbase +
341                                    porttid * sizeof(*tidbase));
342
343         ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
344                    pd->port_port, cnt, tid, tidbase);
345
346         /* virtual address of first page in transfer */
347         vaddr = ti->tidvaddr;
348         if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
349                        cnt * PAGE_SIZE)) {
350                 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
351                           (void *)vaddr, cnt);
352                 ret = -EFAULT;
353                 goto done;
354         }
355         ret = ipath_get_user_pages(vaddr, cnt, pagep);
356         if (ret) {
357                 if (ret == -EBUSY) {
358                         ipath_dbg("Failed to lock addr %p, %u pages "
359                                   "(already locked)\n",
360                                   (void *) vaddr, cnt);
361                         /*
362                          * for now, continue, and see what happens but with
363                          * the new implementation, this should never happen,
364                          * unless perhaps the user has mpin'ed the pages
365                          * themselves (something we need to test)
366                          */
367                         ret = 0;
368                 } else {
369                         dev_info(&dd->pcidev->dev,
370                                  "Failed to lock addr %p, %u pages: "
371                                  "errno %d\n", (void *) vaddr, cnt, -ret);
372                         goto done;
373                 }
374         }
375         for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
376                 for (; ntids--; tid++) {
377                         if (tid == tidcnt)
378                                 tid = 0;
379                         if (!dd->ipath_pageshadow[porttid + tid])
380                                 break;
381                 }
382                 if (ntids < 0) {
383                         /*
384                          * oops, wrapped all the way through their TIDs,
385                          * and didn't have enough free; see comments at
386                          * start of routine
387                          */
388                         ipath_dbg("Not enough free TIDs for %u pages "
389                                   "(index %d), failing\n", cnt, i);
390                         i--;    /* last tidlist[i] not filled in */
391                         ret = -ENOMEM;
392                         break;
393                 }
394                 tidlist[i] = tid + tidoff;
395                 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
396                            "vaddr %lx\n", i, tid + tidoff, vaddr);
397                 /* we "know" system pages and TID pages are same size */
398                 dd->ipath_pageshadow[porttid + tid] = pagep[i];
399                 dd->ipath_physshadow[porttid + tid] = ipath_map_page(
400                         dd->pcidev, pagep[i], 0, PAGE_SIZE,
401                         PCI_DMA_FROMDEVICE);
402                 /*
403                  * don't need atomic or it's overhead
404                  */
405                 __set_bit(tid, tidmap);
406                 physaddr = dd->ipath_physshadow[porttid + tid];
407                 ipath_stats.sps_pagelocks++;
408                 ipath_cdbg(VERBOSE,
409                            "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
410                            tid, vaddr, (unsigned long long) physaddr,
411                            pagep[i]);
412                 dd->ipath_f_put_tid(dd, &tidbase[tid], RCVHQ_RCV_TYPE_EXPECTED,
413                                     physaddr);
414                 /*
415                  * don't check this tid in ipath_portshadow, since we
416                  * just filled it in; start with the next one.
417                  */
418                 tid++;
419         }
420
421         if (ret) {
422                 u32 limit;
423         cleanup:
424                 /* jump here if copy out of updated info failed... */
425                 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
426                           -ret, i, cnt);
427                 /* same code that's in ipath_free_tid() */
428                 limit = sizeof(tidmap) * BITS_PER_BYTE;
429                 if (limit > tidcnt)
430                         /* just in case size changes in future */
431                         limit = tidcnt;
432                 tid = find_first_bit((const unsigned long *)tidmap, limit);
433                 for (; tid < limit; tid++) {
434                         if (!test_bit(tid, tidmap))
435                                 continue;
436                         if (dd->ipath_pageshadow[porttid + tid]) {
437                                 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
438                                            tid);
439                                 dd->ipath_f_put_tid(dd, &tidbase[tid],
440                                                     RCVHQ_RCV_TYPE_EXPECTED,
441                                                     dd->ipath_tidinvalid);
442                                 pci_unmap_page(dd->pcidev,
443                                         dd->ipath_physshadow[porttid + tid],
444                                         PAGE_SIZE, PCI_DMA_FROMDEVICE);
445                                 dd->ipath_pageshadow[porttid + tid] = NULL;
446                                 ipath_stats.sps_pageunlocks++;
447                         }
448                 }
449                 ipath_release_user_pages(pagep, cnt);
450         } else {
451                 /*
452                  * Copy the updated array, with ipath_tid's filled in, back
453                  * to user.  Since we did the copy in already, this "should
454                  * never fail" If it does, we have to clean up...
455                  */
456                 if (copy_to_user((void __user *)
457                                  (unsigned long) ti->tidlist,
458                                  tidlist, cnt * sizeof(*tidlist))) {
459                         ret = -EFAULT;
460                         goto cleanup;
461                 }
462                 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
463                                  tidmap, sizeof tidmap)) {
464                         ret = -EFAULT;
465                         goto cleanup;
466                 }
467                 if (tid == tidcnt)
468                         tid = 0;
469                 if (!pd->port_subport_cnt)
470                         pd->port_tidcursor = tid;
471                 else
472                         tidcursor_fp(fp) = tid;
473         }
474
475 done:
476         if (ret)
477                 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
478                           ti->tidcnt, -ret);
479         return ret;
480 }
481
482 /**
483  * ipath_tid_free - free a port TID
484  * @pd: the port
485  * @subport: the subport
486  * @ti: the TID info
487  *
488  * right now we are unlocking one page at a time, but since
489  * the intended use of this routine is for a single group of
490  * virtually contiguous pages, that should change to improve
491  * performance.  We check that the TID is in range for this port
492  * but otherwise don't check validity; if user has an error and
493  * frees the wrong tid, it's only their own data that can thereby
494  * be corrupted.  We do check that the TID was in use, for sanity
495  * We always use our idea of the saved address, not the address that
496  * they pass in to us.
497  */
498
499 static int ipath_tid_free(struct ipath_portdata *pd, unsigned subport,
500                           const struct ipath_tid_info *ti)
501 {
502         int ret = 0;
503         u32 tid, porttid, cnt, limit, tidcnt;
504         struct ipath_devdata *dd = pd->port_dd;
505         u64 __iomem *tidbase;
506         unsigned long tidmap[8];
507
508         if (!dd->ipath_pageshadow) {
509                 ret = -ENOMEM;
510                 goto done;
511         }
512
513         if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
514                            sizeof tidmap)) {
515                 ret = -EFAULT;
516                 goto done;
517         }
518
519         porttid = pd->port_port * dd->ipath_rcvtidcnt;
520         if (!pd->port_subport_cnt)
521                 tidcnt = dd->ipath_rcvtidcnt;
522         else if (!subport) {
523                 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
524                          (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
525                 porttid += dd->ipath_rcvtidcnt - tidcnt;
526         } else {
527                 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
528                 porttid += tidcnt * (subport - 1);
529         }
530         tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
531                                    dd->ipath_rcvtidbase +
532                                    porttid * sizeof(*tidbase));
533
534         limit = sizeof(tidmap) * BITS_PER_BYTE;
535         if (limit > tidcnt)
536                 /* just in case size changes in future */
537                 limit = tidcnt;
538         tid = find_first_bit(tidmap, limit);
539         ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
540                    "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
541                    limit, tid, porttid);
542         for (cnt = 0; tid < limit; tid++) {
543                 /*
544                  * small optimization; if we detect a run of 3 or so without
545                  * any set, use find_first_bit again.  That's mainly to
546                  * accelerate the case where we wrapped, so we have some at
547                  * the beginning, and some at the end, and a big gap
548                  * in the middle.
549                  */
550                 if (!test_bit(tid, tidmap))
551                         continue;
552                 cnt++;
553                 if (dd->ipath_pageshadow[porttid + tid]) {
554                         struct page *p;
555                         p = dd->ipath_pageshadow[porttid + tid];
556                         dd->ipath_pageshadow[porttid + tid] = NULL;
557                         ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
558                                    pid_nr(pd->port_pid), tid);
559                         dd->ipath_f_put_tid(dd, &tidbase[tid],
560                                             RCVHQ_RCV_TYPE_EXPECTED,
561                                             dd->ipath_tidinvalid);
562                         pci_unmap_page(dd->pcidev,
563                                 dd->ipath_physshadow[porttid + tid],
564                                 PAGE_SIZE, PCI_DMA_FROMDEVICE);
565                         ipath_release_user_pages(&p, 1);
566                         ipath_stats.sps_pageunlocks++;
567                 } else
568                         ipath_dbg("Unused tid %u, ignoring\n", tid);
569         }
570         if (cnt != ti->tidcnt)
571                 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
572                           ti->tidcnt, cnt);
573 done:
574         if (ret)
575                 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
576                           ti->tidcnt, -ret);
577         return ret;
578 }
579
580 /**
581  * ipath_set_part_key - set a partition key
582  * @pd: the port
583  * @key: the key
584  *
585  * We can have up to 4 active at a time (other than the default, which is
586  * always allowed).  This is somewhat tricky, since multiple ports may set
587  * the same key, so we reference count them, and clean up at exit.  All 4
588  * partition keys are packed into a single infinipath register.  It's an
589  * error for a process to set the same pkey multiple times.  We provide no
590  * mechanism to de-allocate a pkey at this time, we may eventually need to
591  * do that.  I've used the atomic operations, and no locking, and only make
592  * a single pass through what's available.  This should be more than
593  * adequate for some time. I'll think about spinlocks or the like if and as
594  * it's necessary.
595  */
596 static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
597 {
598         struct ipath_devdata *dd = pd->port_dd;
599         int i, any = 0, pidx = -1;
600         u16 lkey = key & 0x7FFF;
601         int ret;
602
603         if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) {
604                 /* nothing to do; this key always valid */
605                 ret = 0;
606                 goto bail;
607         }
608
609         ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
610                    "%hx:%x %hx:%x %hx:%x %hx:%x\n",
611                    pd->port_port, key, dd->ipath_pkeys[0],
612                    atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
613                    atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
614                    atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
615                    atomic_read(&dd->ipath_pkeyrefs[3]));
616
617         if (!lkey) {
618                 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
619                            pd->port_port);
620                 ret = -EINVAL;
621                 goto bail;
622         }
623
624         /*
625          * Set the full membership bit, because it has to be
626          * set in the register or the packet, and it seems
627          * cleaner to set in the register than to force all
628          * callers to set it. (see bug 4331)
629          */
630         key |= 0x8000;
631
632         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
633                 if (!pd->port_pkeys[i] && pidx == -1)
634                         pidx = i;
635                 if (pd->port_pkeys[i] == key) {
636                         ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
637                                    "(%x) more than once\n",
638                                    pd->port_port, key);
639                         ret = -EEXIST;
640                         goto bail;
641                 }
642         }
643         if (pidx == -1) {
644                 ipath_dbg("All pkeys for port %u already in use, "
645                           "can't set %x\n", pd->port_port, key);
646                 ret = -EBUSY;
647                 goto bail;
648         }
649         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
650                 if (!dd->ipath_pkeys[i]) {
651                         any++;
652                         continue;
653                 }
654                 if (dd->ipath_pkeys[i] == key) {
655                         atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
656
657                         if (atomic_inc_return(pkrefs) > 1) {
658                                 pd->port_pkeys[pidx] = key;
659                                 ipath_cdbg(VERBOSE, "p%u set key %x "
660                                            "matches #%d, count now %d\n",
661                                            pd->port_port, key, i,
662                                            atomic_read(pkrefs));
663                                 ret = 0;
664                                 goto bail;
665                         } else {
666                                 /*
667                                  * lost race, decrement count, catch below
668                                  */
669                                 atomic_dec(pkrefs);
670                                 ipath_cdbg(VERBOSE, "Lost race, count was "
671                                            "0, after dec, it's %d\n",
672                                            atomic_read(pkrefs));
673                                 any++;
674                         }
675                 }
676                 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
677                         /*
678                          * It makes no sense to have both the limited and
679                          * full membership PKEY set at the same time since
680                          * the unlimited one will disable the limited one.
681                          */
682                         ret = -EEXIST;
683                         goto bail;
684                 }
685         }
686         if (!any) {
687                 ipath_dbg("port %u, all pkeys already in use, "
688                           "can't set %x\n", pd->port_port, key);
689                 ret = -EBUSY;
690                 goto bail;
691         }
692         for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
693                 if (!dd->ipath_pkeys[i] &&
694                     atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
695                         u64 pkey;
696
697                         /* for ipathstats, etc. */
698                         ipath_stats.sps_pkeys[i] = lkey;
699                         pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
700                         pkey =
701                                 (u64) dd->ipath_pkeys[0] |
702                                 ((u64) dd->ipath_pkeys[1] << 16) |
703                                 ((u64) dd->ipath_pkeys[2] << 32) |
704                                 ((u64) dd->ipath_pkeys[3] << 48);
705                         ipath_cdbg(PROC, "p%u set key %x in #%d, "
706                                    "portidx %d, new pkey reg %llx\n",
707                                    pd->port_port, key, i, pidx,
708                                    (unsigned long long) pkey);
709                         ipath_write_kreg(
710                                 dd, dd->ipath_kregs->kr_partitionkey, pkey);
711
712                         ret = 0;
713                         goto bail;
714                 }
715         }
716         ipath_dbg("port %u, all pkeys already in use 2nd pass, "
717                   "can't set %x\n", pd->port_port, key);
718         ret = -EBUSY;
719
720 bail:
721         return ret;
722 }
723
724 /**
725  * ipath_manage_rcvq - manage a port's receive queue
726  * @pd: the port
727  * @subport: the subport
728  * @start_stop: action to carry out
729  *
730  * start_stop == 0 disables receive on the port, for use in queue
731  * overflow conditions.  start_stop==1 re-enables, to be used to
732  * re-init the software copy of the head register
733  */
734 static int ipath_manage_rcvq(struct ipath_portdata *pd, unsigned subport,
735                              int start_stop)
736 {
737         struct ipath_devdata *dd = pd->port_dd;
738
739         ipath_cdbg(PROC, "%sabling rcv for unit %u port %u:%u\n",
740                    start_stop ? "en" : "dis", dd->ipath_unit,
741                    pd->port_port, subport);
742         if (subport)
743                 goto bail;
744         /* atomically clear receive enable port. */
745         if (start_stop) {
746                 /*
747                  * On enable, force in-memory copy of the tail register to
748                  * 0, so that protocol code doesn't have to worry about
749                  * whether or not the chip has yet updated the in-memory
750                  * copy or not on return from the system call. The chip
751                  * always resets it's tail register back to 0 on a
752                  * transition from disabled to enabled.  This could cause a
753                  * problem if software was broken, and did the enable w/o
754                  * the disable, but eventually the in-memory copy will be
755                  * updated and correct itself, even in the face of software
756                  * bugs.
757                  */
758                 if (pd->port_rcvhdrtail_kvaddr)
759                         ipath_clear_rcvhdrtail(pd);
760                 set_bit(dd->ipath_r_portenable_shift + pd->port_port,
761                         &dd->ipath_rcvctrl);
762         } else
763                 clear_bit(dd->ipath_r_portenable_shift + pd->port_port,
764                           &dd->ipath_rcvctrl);
765         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
766                          dd->ipath_rcvctrl);
767         /* now be sure chip saw it before we return */
768         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
769         if (start_stop) {
770                 /*
771                  * And try to be sure that tail reg update has happened too.
772                  * This should in theory interlock with the RXE changes to
773                  * the tail register.  Don't assign it to the tail register
774                  * in memory copy, since we could overwrite an update by the
775                  * chip if we did.
776                  */
777                 ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
778         }
779         /* always; new head should be equal to new tail; see above */
780 bail:
781         return 0;
782 }
783
784 static void ipath_clean_part_key(struct ipath_portdata *pd,
785                                  struct ipath_devdata *dd)
786 {
787         int i, j, pchanged = 0;
788         u64 oldpkey;
789
790         /* for debugging only */
791         oldpkey = (u64) dd->ipath_pkeys[0] |
792                 ((u64) dd->ipath_pkeys[1] << 16) |
793                 ((u64) dd->ipath_pkeys[2] << 32) |
794                 ((u64) dd->ipath_pkeys[3] << 48);
795
796         for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
797                 if (!pd->port_pkeys[i])
798                         continue;
799                 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
800                            pd->port_pkeys[i]);
801                 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
802                         /* check for match independent of the global bit */
803                         if ((dd->ipath_pkeys[j] & 0x7fff) !=
804                             (pd->port_pkeys[i] & 0x7fff))
805                                 continue;
806                         if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
807                                 ipath_cdbg(VERBOSE, "p%u clear key "
808                                            "%x matches #%d\n",
809                                            pd->port_port,
810                                            pd->port_pkeys[i], j);
811                                 ipath_stats.sps_pkeys[j] =
812                                         dd->ipath_pkeys[j] = 0;
813                                 pchanged++;
814                         }
815                         else ipath_cdbg(
816                                 VERBOSE, "p%u key %x matches #%d, "
817                                 "but ref still %d\n", pd->port_port,
818                                 pd->port_pkeys[i], j,
819                                 atomic_read(&dd->ipath_pkeyrefs[j]));
820                         break;
821                 }
822                 pd->port_pkeys[i] = 0;
823         }
824         if (pchanged) {
825                 u64 pkey = (u64) dd->ipath_pkeys[0] |
826                         ((u64) dd->ipath_pkeys[1] << 16) |
827                         ((u64) dd->ipath_pkeys[2] << 32) |
828                         ((u64) dd->ipath_pkeys[3] << 48);
829                 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
830                            "new pkey reg %llx\n", pd->port_port,
831                            (unsigned long long) oldpkey,
832                            (unsigned long long) pkey);
833                 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
834                                  pkey);
835         }
836 }
837
838 /*
839  * Initialize the port data with the receive buffer sizes
840  * so this can be done while the master port is locked.
841  * Otherwise, there is a race with a slave opening the port
842  * and seeing these fields uninitialized.
843  */
844 static void init_user_egr_sizes(struct ipath_portdata *pd)
845 {
846         struct ipath_devdata *dd = pd->port_dd;
847         unsigned egrperchunk, egrcnt, size;
848
849         /*
850          * to avoid wasting a lot of memory, we allocate 32KB chunks of
851          * physically contiguous memory, advance through it until used up
852          * and then allocate more.  Of course, we need memory to store those
853          * extra pointers, now.  Started out with 256KB, but under heavy
854          * memory pressure (creating large files and then copying them over
855          * NFS while doing lots of MPI jobs), we hit some allocation
856          * failures, even though we can sleep...  (2.6.10) Still get
857          * failures at 64K.  32K is the lowest we can go without wasting
858          * additional memory.
859          */
860         size = 0x8000;
861         egrperchunk = size / dd->ipath_rcvegrbufsize;
862         egrcnt = dd->ipath_rcvegrcnt;
863         pd->port_rcvegrbuf_chunks = (egrcnt + egrperchunk - 1) / egrperchunk;
864         pd->port_rcvegrbufs_perchunk = egrperchunk;
865         pd->port_rcvegrbuf_size = size;
866 }
867
868 /**
869  * ipath_create_user_egr - allocate eager TID buffers
870  * @pd: the port to allocate TID buffers for
871  *
872  * This routine is now quite different for user and kernel, because
873  * the kernel uses skb's, for the accelerated network performance
874  * This is the user port version
875  *
876  * Allocate the eager TID buffers and program them into infinipath
877  * They are no longer completely contiguous, we do multiple allocation
878  * calls.
879  */
880 static int ipath_create_user_egr(struct ipath_portdata *pd)
881 {
882         struct ipath_devdata *dd = pd->port_dd;
883         unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
884         size_t size;
885         int ret;
886         gfp_t gfp_flags;
887
888         /*
889          * GFP_USER, but without GFP_FS, so buffer cache can be
890          * coalesced (we hope); otherwise, even at order 4,
891          * heavy filesystem activity makes these fail, and we can
892          * use compound pages.
893          */
894         gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
895
896         egrcnt = dd->ipath_rcvegrcnt;
897         /* TID number offset for this port */
898         egroff = (pd->port_port - 1) * egrcnt + dd->ipath_p0_rcvegrcnt;
899         egrsize = dd->ipath_rcvegrbufsize;
900         ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
901                    "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
902
903         chunk = pd->port_rcvegrbuf_chunks;
904         egrperchunk = pd->port_rcvegrbufs_perchunk;
905         size = pd->port_rcvegrbuf_size;
906         pd->port_rcvegrbuf = kmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]),
907                                      GFP_KERNEL);
908         if (!pd->port_rcvegrbuf) {
909                 ret = -ENOMEM;
910                 goto bail;
911         }
912         pd->port_rcvegrbuf_phys =
913                 kmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]),
914                         GFP_KERNEL);
915         if (!pd->port_rcvegrbuf_phys) {
916                 ret = -ENOMEM;
917                 goto bail_rcvegrbuf;
918         }
919         for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
920
921                 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
922                         &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
923                         gfp_flags);
924
925                 if (!pd->port_rcvegrbuf[e]) {
926                         ret = -ENOMEM;
927                         goto bail_rcvegrbuf_phys;
928                 }
929         }
930
931         pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
932
933         for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
934                 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
935                 unsigned i;
936
937                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
938                         dd->ipath_f_put_tid(dd, e + egroff +
939                                             (u64 __iomem *)
940                                             ((char __iomem *)
941                                              dd->ipath_kregbase +
942                                              dd->ipath_rcvegrbase),
943                                             RCVHQ_RCV_TYPE_EAGER, pa);
944                         pa += egrsize;
945                 }
946                 cond_resched(); /* don't hog the cpu */
947         }
948
949         ret = 0;
950         goto bail;
951
952 bail_rcvegrbuf_phys:
953         for (e = 0; e < pd->port_rcvegrbuf_chunks &&
954                 pd->port_rcvegrbuf[e]; e++) {
955                 dma_free_coherent(&dd->pcidev->dev, size,
956                                   pd->port_rcvegrbuf[e],
957                                   pd->port_rcvegrbuf_phys[e]);
958
959         }
960         kfree(pd->port_rcvegrbuf_phys);
961         pd->port_rcvegrbuf_phys = NULL;
962 bail_rcvegrbuf:
963         kfree(pd->port_rcvegrbuf);
964         pd->port_rcvegrbuf = NULL;
965 bail:
966         return ret;
967 }
968
969
970 /* common code for the mappings on dma_alloc_coherent mem */
971 static int ipath_mmap_mem(struct vm_area_struct *vma,
972         struct ipath_portdata *pd, unsigned len, int write_ok,
973         void *kvaddr, char *what)
974 {
975         struct ipath_devdata *dd = pd->port_dd;
976         unsigned long pfn;
977         int ret;
978
979         if ((vma->vm_end - vma->vm_start) > len) {
980                 dev_info(&dd->pcidev->dev,
981                          "FAIL on %s: len %lx > %x\n", what,
982                          vma->vm_end - vma->vm_start, len);
983                 ret = -EFAULT;
984                 goto bail;
985         }
986
987         if (!write_ok) {
988                 if (vma->vm_flags & VM_WRITE) {
989                         dev_info(&dd->pcidev->dev,
990                                  "%s must be mapped readonly\n", what);
991                         ret = -EPERM;
992                         goto bail;
993                 }
994
995                 /* don't allow them to later change with mprotect */
996                 vma->vm_flags &= ~VM_MAYWRITE;
997         }
998
999         pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
1000         ret = remap_pfn_range(vma, vma->vm_start, pfn,
1001                               len, vma->vm_page_prot);
1002         if (ret)
1003                 dev_info(&dd->pcidev->dev, "%s port%u mmap of %lx, %x "
1004                          "bytes r%c failed: %d\n", what, pd->port_port,
1005                          pfn, len, write_ok?'w':'o', ret);
1006         else
1007                 ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes "
1008                            "r%c\n", what, pd->port_port, pfn, len,
1009                            write_ok?'w':'o');
1010 bail:
1011         return ret;
1012 }
1013
1014 static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
1015                      u64 ureg)
1016 {
1017         unsigned long phys;
1018         int ret;
1019
1020         /*
1021          * This is real hardware, so use io_remap.  This is the mechanism
1022          * for the user process to update the head registers for their port
1023          * in the chip.
1024          */
1025         if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1026                 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
1027                          "%lx > PAGE\n", vma->vm_end - vma->vm_start);
1028                 ret = -EFAULT;
1029         } else {
1030                 phys = dd->ipath_physaddr + ureg;
1031                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1032
1033                 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1034                 ret = io_remap_pfn_range(vma, vma->vm_start,
1035                                          phys >> PAGE_SHIFT,
1036                                          vma->vm_end - vma->vm_start,
1037                                          vma->vm_page_prot);
1038         }
1039         return ret;
1040 }
1041
1042 static int mmap_piobufs(struct vm_area_struct *vma,
1043                         struct ipath_devdata *dd,
1044                         struct ipath_portdata *pd,
1045                         unsigned piobufs, unsigned piocnt)
1046 {
1047         unsigned long phys;
1048         int ret;
1049
1050         /*
1051          * When we map the PIO buffers in the chip, we want to map them as
1052          * writeonly, no read possible.   This prevents access to previous
1053          * process data, and catches users who might try to read the i/o
1054          * space due to a bug.
1055          */
1056         if ((vma->vm_end - vma->vm_start) > (piocnt * dd->ipath_palign)) {
1057                 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
1058                          "reqlen %lx > PAGE\n",
1059                          vma->vm_end - vma->vm_start);
1060                 ret = -EINVAL;
1061                 goto bail;
1062         }
1063
1064         phys = dd->ipath_physaddr + piobufs;
1065
1066 #if defined(__powerpc__)
1067         /* There isn't a generic way to specify writethrough mappings */
1068         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1069         pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
1070         pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
1071 #endif
1072
1073         /*
1074          * don't allow them to later change to readable with mprotect (for when
1075          * not initially mapped readable, as is normally the case)
1076          */
1077         vma->vm_flags &= ~VM_MAYREAD;
1078         vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1079
1080         ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1081                                  vma->vm_end - vma->vm_start,
1082                                  vma->vm_page_prot);
1083 bail:
1084         return ret;
1085 }
1086
1087 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1088                            struct ipath_portdata *pd)
1089 {
1090         struct ipath_devdata *dd = pd->port_dd;
1091         unsigned long start, size;
1092         size_t total_size, i;
1093         unsigned long pfn;
1094         int ret;
1095
1096         size = pd->port_rcvegrbuf_size;
1097         total_size = pd->port_rcvegrbuf_chunks * size;
1098         if ((vma->vm_end - vma->vm_start) > total_size) {
1099                 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1100                          "reqlen %lx > actual %lx\n",
1101                          vma->vm_end - vma->vm_start,
1102                          (unsigned long) total_size);
1103                 ret = -EINVAL;
1104                 goto bail;
1105         }
1106
1107         if (vma->vm_flags & VM_WRITE) {
1108                 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1109                          "writable (flags=%lx)\n", vma->vm_flags);
1110                 ret = -EPERM;
1111                 goto bail;
1112         }
1113         /* don't allow them to later change to writeable with mprotect */
1114         vma->vm_flags &= ~VM_MAYWRITE;
1115
1116         start = vma->vm_start;
1117
1118         for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1119                 pfn = virt_to_phys(pd->port_rcvegrbuf[i]) >> PAGE_SHIFT;
1120                 ret = remap_pfn_range(vma, start, pfn, size,
1121                                       vma->vm_page_prot);
1122                 if (ret < 0)
1123                         goto bail;
1124         }
1125         ret = 0;
1126
1127 bail:
1128         return ret;
1129 }
1130
1131 /*
1132  * ipath_file_vma_fault - handle a VMA page fault.
1133  */
1134 static int ipath_file_vma_fault(struct vm_area_struct *vma,
1135                                         struct vm_fault *vmf)
1136 {
1137         struct page *page;
1138
1139         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
1140         if (!page)
1141                 return VM_FAULT_SIGBUS;
1142         get_page(page);
1143         vmf->page = page;
1144
1145         return 0;
1146 }
1147
1148 static struct vm_operations_struct ipath_file_vm_ops = {
1149         .fault = ipath_file_vma_fault,
1150 };
1151
1152 static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
1153                        struct ipath_portdata *pd, unsigned subport)
1154 {
1155         unsigned long len;
1156         struct ipath_devdata *dd;
1157         void *addr;
1158         size_t size;
1159         int ret = 0;
1160
1161         /* If the port is not shared, all addresses should be physical */
1162         if (!pd->port_subport_cnt)
1163                 goto bail;
1164
1165         dd = pd->port_dd;
1166         size = pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
1167
1168         /*
1169          * Each process has all the subport uregbase, rcvhdrq, and
1170          * rcvegrbufs mmapped - as an array for all the processes,
1171          * and also separately for this process.
1172          */
1173         if (pgaddr == cvt_kvaddr(pd->subport_uregbase)) {
1174                 addr = pd->subport_uregbase;
1175                 size = PAGE_SIZE * pd->port_subport_cnt;
1176         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base)) {
1177                 addr = pd->subport_rcvhdr_base;
1178                 size = pd->port_rcvhdrq_size * pd->port_subport_cnt;
1179         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf)) {
1180                 addr = pd->subport_rcvegrbuf;
1181                 size *= pd->port_subport_cnt;
1182         } else if (pgaddr == cvt_kvaddr(pd->subport_uregbase +
1183                                         PAGE_SIZE * subport)) {
1184                 addr = pd->subport_uregbase + PAGE_SIZE * subport;
1185                 size = PAGE_SIZE;
1186         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base +
1187                                 pd->port_rcvhdrq_size * subport)) {
1188                 addr = pd->subport_rcvhdr_base +
1189                         pd->port_rcvhdrq_size * subport;
1190                 size = pd->port_rcvhdrq_size;
1191         } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf +
1192                                size * subport)) {
1193                 addr = pd->subport_rcvegrbuf + size * subport;
1194                 /* rcvegrbufs are read-only on the slave */
1195                 if (vma->vm_flags & VM_WRITE) {
1196                         dev_info(&dd->pcidev->dev,
1197                                  "Can't map eager buffers as "
1198                                  "writable (flags=%lx)\n", vma->vm_flags);
1199                         ret = -EPERM;
1200                         goto bail;
1201                 }
1202                 /*
1203                  * Don't allow permission to later change to writeable
1204                  * with mprotect.
1205                  */
1206                 vma->vm_flags &= ~VM_MAYWRITE;
1207         } else {
1208                 goto bail;
1209         }
1210         len = vma->vm_end - vma->vm_start;
1211         if (len > size) {
1212                 ipath_cdbg(MM, "FAIL: reqlen %lx > %zx\n", len, size);
1213                 ret = -EINVAL;
1214                 goto bail;
1215         }
1216
1217         vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
1218         vma->vm_ops = &ipath_file_vm_ops;
1219         vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
1220         ret = 1;
1221
1222 bail:
1223         return ret;
1224 }
1225
1226 /**
1227  * ipath_mmap - mmap various structures into user space
1228  * @fp: the file pointer
1229  * @vma: the VM area
1230  *
1231  * We use this to have a shared buffer between the kernel and the user code
1232  * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1233  * buffers in the chip.  We have the open and close entries so we can bump
1234  * the ref count and keep the driver from being unloaded while still mapped.
1235  */
1236 static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1237 {
1238         struct ipath_portdata *pd;
1239         struct ipath_devdata *dd;
1240         u64 pgaddr, ureg;
1241         unsigned piobufs, piocnt;
1242         int ret;
1243
1244         pd = port_fp(fp);
1245         if (!pd) {
1246                 ret = -EINVAL;
1247                 goto bail;
1248         }
1249         dd = pd->port_dd;
1250
1251         /*
1252          * This is the ipath_do_user_init() code, mapping the shared buffers
1253          * into the user process. The address referred to by vm_pgoff is the
1254          * file offset passed via mmap().  For shared ports, this is the
1255          * kernel vmalloc() address of the pages to share with the master.
1256          * For non-shared or master ports, this is a physical address.
1257          * We only do one mmap for each space mapped.
1258          */
1259         pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1260
1261         /*
1262          * Check for 0 in case one of the allocations failed, but user
1263          * called mmap anyway.
1264          */
1265         if (!pgaddr)  {
1266                 ret = -EINVAL;
1267                 goto bail;
1268         }
1269
1270         ipath_cdbg(MM, "pgaddr %llx vm_start=%lx len %lx port %u:%u:%u\n",
1271                    (unsigned long long) pgaddr, vma->vm_start,
1272                    vma->vm_end - vma->vm_start, dd->ipath_unit,
1273                    pd->port_port, subport_fp(fp));
1274
1275         /*
1276          * Physical addresses must fit in 40 bits for our hardware.
1277          * Check for kernel virtual addresses first, anything else must
1278          * match a HW or memory address.
1279          */
1280         ret = mmap_kvaddr(vma, pgaddr, pd, subport_fp(fp));
1281         if (ret) {
1282                 if (ret > 0)
1283                         ret = 0;
1284                 goto bail;
1285         }
1286
1287         ureg = dd->ipath_uregbase + dd->ipath_ureg_align * pd->port_port;
1288         if (!pd->port_subport_cnt) {
1289                 /* port is not shared */
1290                 piocnt = pd->port_piocnt;
1291                 piobufs = pd->port_piobufs;
1292         } else if (!subport_fp(fp)) {
1293                 /* caller is the master */
1294                 piocnt = (pd->port_piocnt / pd->port_subport_cnt) +
1295                          (pd->port_piocnt % pd->port_subport_cnt);
1296                 piobufs = pd->port_piobufs +
1297                         dd->ipath_palign * (pd->port_piocnt - piocnt);
1298         } else {
1299                 unsigned slave = subport_fp(fp) - 1;
1300
1301                 /* caller is a slave */
1302                 piocnt = pd->port_piocnt / pd->port_subport_cnt;
1303                 piobufs = pd->port_piobufs + dd->ipath_palign * piocnt * slave;
1304         }
1305
1306         if (pgaddr == ureg)
1307                 ret = mmap_ureg(vma, dd, ureg);
1308         else if (pgaddr == piobufs)
1309                 ret = mmap_piobufs(vma, dd, pd, piobufs, piocnt);
1310         else if (pgaddr == dd->ipath_pioavailregs_phys)
1311                 /* in-memory copy of pioavail registers */
1312                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1313                                      (void *) dd->ipath_pioavailregs_dma,
1314                                      "pioavail registers");
1315         else if (pgaddr == pd->port_rcvegr_phys)
1316                 ret = mmap_rcvegrbufs(vma, pd);
1317         else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1318                 /*
1319                  * The rcvhdrq itself; readonly except on HT (so have
1320                  * to allow writable mapping), multiple pages, contiguous
1321                  * from an i/o perspective.
1322                  */
1323                 ret = ipath_mmap_mem(vma, pd, pd->port_rcvhdrq_size, 1,
1324                                      pd->port_rcvhdrq,
1325                                      "rcvhdrq");
1326         else if (pgaddr == (u64) pd->port_rcvhdrqtailaddr_phys)
1327                 /* in-memory copy of rcvhdrq tail register */
1328                 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1329                                      pd->port_rcvhdrtail_kvaddr,
1330                                      "rcvhdrq tail");
1331         else
1332                 ret = -EINVAL;
1333
1334         vma->vm_private_data = NULL;
1335
1336         if (ret < 0)
1337                 dev_info(&dd->pcidev->dev,
1338                          "Failure %d on off %llx len %lx\n",
1339                          -ret, (unsigned long long)pgaddr,
1340                          vma->vm_end - vma->vm_start);
1341 bail:
1342         return ret;
1343 }
1344
1345 static unsigned ipath_poll_hdrqfull(struct ipath_portdata *pd)
1346 {
1347         unsigned pollflag = 0;
1348
1349         if ((pd->poll_type & IPATH_POLL_TYPE_OVERFLOW) &&
1350             pd->port_hdrqfull != pd->port_hdrqfull_poll) {
1351                 pollflag |= POLLIN | POLLRDNORM;
1352                 pd->port_hdrqfull_poll = pd->port_hdrqfull;
1353         }
1354
1355         return pollflag;
1356 }
1357
1358 static unsigned int ipath_poll_urgent(struct ipath_portdata *pd,
1359                                       struct file *fp,
1360                                       struct poll_table_struct *pt)
1361 {
1362         unsigned pollflag = 0;
1363         struct ipath_devdata *dd;
1364
1365         dd = pd->port_dd;
1366
1367         /* variable access in ipath_poll_hdrqfull() needs this */
1368         rmb();
1369         pollflag = ipath_poll_hdrqfull(pd);
1370
1371         if (pd->port_urgent != pd->port_urgent_poll) {
1372                 pollflag |= POLLIN | POLLRDNORM;
1373                 pd->port_urgent_poll = pd->port_urgent;
1374         }
1375
1376         if (!pollflag) {
1377                 /* this saves a spin_lock/unlock in interrupt handler... */
1378                 set_bit(IPATH_PORT_WAITING_URG, &pd->port_flag);
1379                 /* flush waiting flag so don't miss an event... */
1380                 wmb();
1381                 poll_wait(fp, &pd->port_wait, pt);
1382         }
1383
1384         return pollflag;
1385 }
1386
1387 static unsigned int ipath_poll_next(struct ipath_portdata *pd,
1388                                     struct file *fp,
1389                                     struct poll_table_struct *pt)
1390 {
1391         u32 head;
1392         u32 tail;
1393         unsigned pollflag = 0;
1394         struct ipath_devdata *dd;
1395
1396         dd = pd->port_dd;
1397
1398         /* variable access in ipath_poll_hdrqfull() needs this */
1399         rmb();
1400         pollflag = ipath_poll_hdrqfull(pd);
1401
1402         head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1403         if (pd->port_rcvhdrtail_kvaddr)
1404                 tail = ipath_get_rcvhdrtail(pd);
1405         else
1406                 tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1407
1408         if (head != tail)
1409                 pollflag |= POLLIN | POLLRDNORM;
1410         else {
1411                 /* this saves a spin_lock/unlock in interrupt handler */
1412                 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1413                 /* flush waiting flag so we don't miss an event */
1414                 wmb();
1415
1416                 set_bit(pd->port_port + dd->ipath_r_intravail_shift,
1417                         &dd->ipath_rcvctrl);
1418
1419                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1420                                  dd->ipath_rcvctrl);
1421
1422                 if (dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1423                         ipath_write_ureg(dd, ur_rcvhdrhead,
1424                                          dd->ipath_rhdrhead_intr_off | head,
1425                                          pd->port_port);
1426
1427                 poll_wait(fp, &pd->port_wait, pt);
1428         }
1429
1430         return pollflag;
1431 }
1432
1433 static unsigned int ipath_poll(struct file *fp,
1434                                struct poll_table_struct *pt)
1435 {
1436         struct ipath_portdata *pd;
1437         unsigned pollflag;
1438
1439         pd = port_fp(fp);
1440         if (!pd)
1441                 pollflag = 0;
1442         else if (pd->poll_type & IPATH_POLL_TYPE_URGENT)
1443                 pollflag = ipath_poll_urgent(pd, fp, pt);
1444         else
1445                 pollflag = ipath_poll_next(pd, fp, pt);
1446
1447         return pollflag;
1448 }
1449
1450 static int ipath_supports_subports(int user_swmajor, int user_swminor)
1451 {
1452         /* no subport implementation prior to software version 1.3 */
1453         return (user_swmajor > 1) || (user_swminor >= 3);
1454 }
1455
1456 static int ipath_compatible_subports(int user_swmajor, int user_swminor)
1457 {
1458         /* this code is written long-hand for clarity */
1459         if (IPATH_USER_SWMAJOR != user_swmajor) {
1460                 /* no promise of compatibility if major mismatch */
1461                 return 0;
1462         }
1463         if (IPATH_USER_SWMAJOR == 1) {
1464                 switch (IPATH_USER_SWMINOR) {
1465                 case 0:
1466                 case 1:
1467                 case 2:
1468                         /* no subport implementation so cannot be compatible */
1469                         return 0;
1470                 case 3:
1471                         /* 3 is only compatible with itself */
1472                         return user_swminor == 3;
1473                 default:
1474                         /* >= 4 are compatible (or are expected to be) */
1475                         return user_swminor >= 4;
1476                 }
1477         }
1478         /* make no promises yet for future major versions */
1479         return 0;
1480 }
1481
1482 static int init_subports(struct ipath_devdata *dd,
1483                          struct ipath_portdata *pd,
1484                          const struct ipath_user_info *uinfo)
1485 {
1486         int ret = 0;
1487         unsigned num_subports;
1488         size_t size;
1489
1490         /*
1491          * If the user is requesting zero subports,
1492          * skip the subport allocation.
1493          */
1494         if (uinfo->spu_subport_cnt <= 0)
1495                 goto bail;
1496
1497         /* Self-consistency check for ipath_compatible_subports() */
1498         if (ipath_supports_subports(IPATH_USER_SWMAJOR, IPATH_USER_SWMINOR) &&
1499             !ipath_compatible_subports(IPATH_USER_SWMAJOR,
1500                                        IPATH_USER_SWMINOR)) {
1501                 dev_info(&dd->pcidev->dev,
1502                          "Inconsistent ipath_compatible_subports()\n");
1503                 goto bail;
1504         }
1505
1506         /* Check for subport compatibility */
1507         if (!ipath_compatible_subports(uinfo->spu_userversion >> 16,
1508                                        uinfo->spu_userversion & 0xffff)) {
1509                 dev_info(&dd->pcidev->dev,
1510                          "Mismatched user version (%d.%d) and driver "
1511                          "version (%d.%d) while port sharing. Ensure "
1512                          "that driver and library are from the same "
1513                          "release.\n",
1514                          (int) (uinfo->spu_userversion >> 16),
1515                          (int) (uinfo->spu_userversion & 0xffff),
1516                          IPATH_USER_SWMAJOR,
1517                          IPATH_USER_SWMINOR);
1518                 goto bail;
1519         }
1520         if (uinfo->spu_subport_cnt > INFINIPATH_MAX_SUBPORT) {
1521                 ret = -EINVAL;
1522                 goto bail;
1523         }
1524
1525         num_subports = uinfo->spu_subport_cnt;
1526         pd->subport_uregbase = vmalloc(PAGE_SIZE * num_subports);
1527         if (!pd->subport_uregbase) {
1528                 ret = -ENOMEM;
1529                 goto bail;
1530         }
1531         /* Note: pd->port_rcvhdrq_size isn't initialized yet. */
1532         size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1533                      sizeof(u32), PAGE_SIZE) * num_subports;
1534         pd->subport_rcvhdr_base = vmalloc(size);
1535         if (!pd->subport_rcvhdr_base) {
1536                 ret = -ENOMEM;
1537                 goto bail_ureg;
1538         }
1539
1540         pd->subport_rcvegrbuf = vmalloc(pd->port_rcvegrbuf_chunks *
1541                                         pd->port_rcvegrbuf_size *
1542                                         num_subports);
1543         if (!pd->subport_rcvegrbuf) {
1544                 ret = -ENOMEM;
1545                 goto bail_rhdr;
1546         }
1547
1548         pd->port_subport_cnt = uinfo->spu_subport_cnt;
1549         pd->port_subport_id = uinfo->spu_subport_id;
1550         pd->active_slaves = 1;
1551         set_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1552         memset(pd->subport_uregbase, 0, PAGE_SIZE * num_subports);
1553         memset(pd->subport_rcvhdr_base, 0, size);
1554         memset(pd->subport_rcvegrbuf, 0, pd->port_rcvegrbuf_chunks *
1555                                          pd->port_rcvegrbuf_size *
1556                                          num_subports);
1557         goto bail;
1558
1559 bail_rhdr:
1560         vfree(pd->subport_rcvhdr_base);
1561 bail_ureg:
1562         vfree(pd->subport_uregbase);
1563         pd->subport_uregbase = NULL;
1564 bail:
1565         return ret;
1566 }
1567
1568 static int try_alloc_port(struct ipath_devdata *dd, int port,
1569                           struct file *fp,
1570                           const struct ipath_user_info *uinfo)
1571 {
1572         struct ipath_portdata *pd;
1573         int ret;
1574
1575         if (!(pd = dd->ipath_pd[port])) {
1576                 void *ptmp;
1577
1578                 pd = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1579
1580                 /*
1581                  * Allocate memory for use in ipath_tid_update() just once
1582                  * at open, not per call.  Reduces cost of expected send
1583                  * setup.
1584                  */
1585                 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1586                                dd->ipath_rcvtidcnt * sizeof(struct page **),
1587                                GFP_KERNEL);
1588                 if (!pd || !ptmp) {
1589                         ipath_dev_err(dd, "Unable to allocate portdata "
1590                                       "memory, failing open\n");
1591                         ret = -ENOMEM;
1592                         kfree(pd);
1593                         kfree(ptmp);
1594                         goto bail;
1595                 }
1596                 dd->ipath_pd[port] = pd;
1597                 dd->ipath_pd[port]->port_port = port;
1598                 dd->ipath_pd[port]->port_dd = dd;
1599                 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1600                 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1601         }
1602         if (!pd->port_cnt) {
1603                 pd->userversion = uinfo->spu_userversion;
1604                 init_user_egr_sizes(pd);
1605                 if ((ret = init_subports(dd, pd, uinfo)) != 0)
1606                         goto bail;
1607                 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1608                            current->comm, current->pid, dd->ipath_unit,
1609                            port);
1610                 pd->port_cnt = 1;
1611                 port_fp(fp) = pd;
1612                 pd->port_pid = get_pid(task_pid(current));
1613                 strncpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
1614                 ipath_stats.sps_ports++;
1615                 ret = 0;
1616         } else
1617                 ret = -EBUSY;
1618
1619 bail:
1620         return ret;
1621 }
1622
1623 static inline int usable(struct ipath_devdata *dd)
1624 {
1625         return dd &&
1626                 (dd->ipath_flags & IPATH_PRESENT) &&
1627                 dd->ipath_kregbase &&
1628                 dd->ipath_lid &&
1629                 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1630                                      | IPATH_LINKUNK));
1631 }
1632
1633 static int find_free_port(int unit, struct file *fp,
1634                           const struct ipath_user_info *uinfo)
1635 {
1636         struct ipath_devdata *dd = ipath_lookup(unit);
1637         int ret, i;
1638
1639         if (!dd) {
1640                 ret = -ENODEV;
1641                 goto bail;
1642         }
1643
1644         if (!usable(dd)) {
1645                 ret = -ENETDOWN;
1646                 goto bail;
1647         }
1648
1649         for (i = 1; i < dd->ipath_cfgports; i++) {
1650                 ret = try_alloc_port(dd, i, fp, uinfo);
1651                 if (ret != -EBUSY)
1652                         goto bail;
1653         }
1654         ret = -EBUSY;
1655
1656 bail:
1657         return ret;
1658 }
1659
1660 static int find_best_unit(struct file *fp,
1661                           const struct ipath_user_info *uinfo)
1662 {
1663         int ret = 0, i, prefunit = -1, devmax;
1664         int maxofallports, npresent, nup;
1665         int ndev;
1666
1667         devmax = ipath_count_units(&npresent, &nup, &maxofallports);
1668
1669         /*
1670          * This code is present to allow a knowledgeable person to
1671          * specify the layout of processes to processors before opening
1672          * this driver, and then we'll assign the process to the "closest"
1673          * InfiniPath chip to that processor (we assume reasonable connectivity,
1674          * for now).  This code assumes that if affinity has been set
1675          * before this point, that at most one cpu is set; for now this
1676          * is reasonable.  I check for both cpus_empty() and cpus_full(),
1677          * in case some kernel variant sets none of the bits when no
1678          * affinity is set.  2.6.11 and 12 kernels have all present
1679          * cpus set.  Some day we'll have to fix it up further to handle
1680          * a cpu subset.  This algorithm fails for two HT chips connected
1681          * in tunnel fashion.  Eventually this needs real topology
1682          * information.  There may be some issues with dual core numbering
1683          * as well.  This needs more work prior to release.
1684          */
1685         if (!cpus_empty(current->cpus_allowed) &&
1686             !cpus_full(current->cpus_allowed)) {
1687                 int ncpus = num_online_cpus(), curcpu = -1, nset = 0;
1688                 for (i = 0; i < ncpus; i++)
1689                         if (cpu_isset(i, current->cpus_allowed)) {
1690                                 ipath_cdbg(PROC, "%s[%u] affinity set for "
1691                                            "cpu %d/%d\n", current->comm,
1692                                            current->pid, i, ncpus);
1693                                 curcpu = i;
1694                                 nset++;
1695                         }
1696                 if (curcpu != -1 && nset != ncpus) {
1697                         if (npresent) {
1698                                 prefunit = curcpu / (ncpus / npresent);
1699                                 ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, "
1700                                           "%d cpus/chip, select unit %d\n",
1701                                           current->comm, current->pid,
1702                                           npresent, ncpus, ncpus / npresent,
1703                                           prefunit);
1704                         }
1705                 }
1706         }
1707
1708         /*
1709          * user ports start at 1, kernel port is 0
1710          * For now, we do round-robin access across all chips
1711          */
1712
1713         if (prefunit != -1)
1714                 devmax = prefunit + 1;
1715 recheck:
1716         for (i = 1; i < maxofallports; i++) {
1717                 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1718                      ndev++) {
1719                         struct ipath_devdata *dd = ipath_lookup(ndev);
1720
1721                         if (!usable(dd))
1722                                 continue; /* can't use this unit */
1723                         if (i >= dd->ipath_cfgports)
1724                                 /*
1725                                  * Maxed out on users of this unit. Try
1726                                  * next.
1727                                  */
1728                                 continue;
1729                         ret = try_alloc_port(dd, i, fp, uinfo);
1730                         if (!ret)
1731                                 goto done;
1732                 }
1733         }
1734
1735         if (npresent) {
1736                 if (nup == 0) {
1737                         ret = -ENETDOWN;
1738                         ipath_dbg("No ports available (none initialized "
1739                                   "and ready)\n");
1740                 } else {
1741                         if (prefunit > 0) {
1742                                 /* if started above 0, retry from 0 */
1743                                 ipath_cdbg(PROC,
1744                                            "%s[%u] no ports on prefunit "
1745                                            "%d, clear and re-check\n",
1746                                            current->comm, current->pid,
1747                                            prefunit);
1748                                 devmax = ipath_count_units(NULL, NULL,
1749                                                            NULL);
1750                                 prefunit = -1;
1751                                 goto recheck;
1752                         }
1753                         ret = -EBUSY;
1754                         ipath_dbg("No ports available\n");
1755                 }
1756         } else {
1757                 ret = -ENXIO;
1758                 ipath_dbg("No boards found\n");
1759         }
1760
1761 done:
1762         return ret;
1763 }
1764
1765 static int find_shared_port(struct file *fp,
1766                             const struct ipath_user_info *uinfo)
1767 {
1768         int devmax, ndev, i;
1769         int ret = 0;
1770
1771         devmax = ipath_count_units(NULL, NULL, NULL);
1772
1773         for (ndev = 0; ndev < devmax; ndev++) {
1774                 struct ipath_devdata *dd = ipath_lookup(ndev);
1775
1776                 if (!usable(dd))
1777                         continue;
1778                 for (i = 1; i < dd->ipath_cfgports; i++) {
1779                         struct ipath_portdata *pd = dd->ipath_pd[i];
1780
1781                         /* Skip ports which are not yet open */
1782                         if (!pd || !pd->port_cnt)
1783                                 continue;
1784                         /* Skip port if it doesn't match the requested one */
1785                         if (pd->port_subport_id != uinfo->spu_subport_id)
1786                                 continue;
1787                         /* Verify the sharing process matches the master */
1788                         if (pd->port_subport_cnt != uinfo->spu_subport_cnt ||
1789                             pd->userversion != uinfo->spu_userversion ||
1790                             pd->port_cnt >= pd->port_subport_cnt) {
1791                                 ret = -EINVAL;
1792                                 goto done;
1793                         }
1794                         port_fp(fp) = pd;
1795                         subport_fp(fp) = pd->port_cnt++;
1796                         pd->port_subpid[subport_fp(fp)] =
1797                                 get_pid(task_pid(current));
1798                         tidcursor_fp(fp) = 0;
1799                         pd->active_slaves |= 1 << subport_fp(fp);
1800                         ipath_cdbg(PROC,
1801                                    "%s[%u] %u sharing %s[%u] unit:port %u:%u\n",
1802                                    current->comm, current->pid,
1803                                    subport_fp(fp),
1804                                    pd->port_comm, pid_nr(pd->port_pid),
1805                                    dd->ipath_unit, pd->port_port);
1806                         ret = 1;
1807                         goto done;
1808                 }
1809         }
1810
1811 done:
1812         return ret;
1813 }
1814
1815 static int ipath_open(struct inode *in, struct file *fp)
1816 {
1817         /* The real work is performed later in ipath_assign_port() */
1818         fp->private_data = kzalloc(sizeof(struct ipath_filedata), GFP_KERNEL);
1819         return fp->private_data ? 0 : -ENOMEM;
1820 }
1821
1822 /* Get port early, so can set affinity prior to memory allocation */
1823 static int ipath_assign_port(struct file *fp,
1824                               const struct ipath_user_info *uinfo)
1825 {
1826         int ret;
1827         int i_minor;
1828         unsigned swmajor, swminor;
1829
1830         /* Check to be sure we haven't already initialized this file */
1831         if (port_fp(fp)) {
1832                 ret = -EINVAL;
1833                 goto done;
1834         }
1835
1836         /* for now, if major version is different, bail */
1837         swmajor = uinfo->spu_userversion >> 16;
1838         if (swmajor != IPATH_USER_SWMAJOR) {
1839                 ipath_dbg("User major version %d not same as driver "
1840                           "major %d\n", uinfo->spu_userversion >> 16,
1841                           IPATH_USER_SWMAJOR);
1842                 ret = -ENODEV;
1843                 goto done;
1844         }
1845
1846         swminor = uinfo->spu_userversion & 0xffff;
1847         if (swminor != IPATH_USER_SWMINOR)
1848                 ipath_dbg("User minor version %d not same as driver "
1849                           "minor %d\n", swminor, IPATH_USER_SWMINOR);
1850
1851         mutex_lock(&ipath_mutex);
1852
1853         if (ipath_compatible_subports(swmajor, swminor) &&
1854             uinfo->spu_subport_cnt &&
1855             (ret = find_shared_port(fp, uinfo))) {
1856                 if (ret > 0)
1857                         ret = 0;
1858                 goto done_chk_sdma;
1859         }
1860
1861         i_minor = iminor(fp->f_path.dentry->d_inode) - IPATH_USER_MINOR_BASE;
1862         ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1863                    (long)fp->f_path.dentry->d_inode->i_rdev, i_minor);
1864
1865         if (i_minor)
1866                 ret = find_free_port(i_minor - 1, fp, uinfo);
1867         else
1868                 ret = find_best_unit(fp, uinfo);
1869
1870 done_chk_sdma:
1871         if (!ret) {
1872                 struct ipath_filedata *fd = fp->private_data;
1873                 const struct ipath_portdata *pd = fd->pd;
1874                 const struct ipath_devdata *dd = pd->port_dd;
1875
1876                 fd->pq = ipath_user_sdma_queue_create(&dd->pcidev->dev,
1877                                                       dd->ipath_unit,
1878                                                       pd->port_port,
1879                                                       fd->subport);
1880
1881                 if (!fd->pq)
1882                         ret = -ENOMEM;
1883         }
1884
1885         mutex_unlock(&ipath_mutex);
1886
1887 done:
1888         return ret;
1889 }
1890
1891
1892 static int ipath_do_user_init(struct file *fp,
1893                               const struct ipath_user_info *uinfo)
1894 {
1895         int ret;
1896         struct ipath_portdata *pd = port_fp(fp);
1897         struct ipath_devdata *dd;
1898         u32 head32;
1899
1900         /* Subports don't need to initialize anything since master did it. */
1901         if (subport_fp(fp)) {
1902                 ret = wait_event_interruptible(pd->port_wait,
1903                         !test_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag));
1904                 goto done;
1905         }
1906
1907         dd = pd->port_dd;
1908
1909         if (uinfo->spu_rcvhdrsize) {
1910                 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
1911                 if (ret)
1912                         goto done;
1913         }
1914
1915         /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
1916
1917         /* some ports may get extra buffers, calculate that here */
1918         if (pd->port_port <= dd->ipath_ports_extrabuf)
1919                 pd->port_piocnt = dd->ipath_pbufsport + 1;
1920         else
1921                 pd->port_piocnt = dd->ipath_pbufsport;
1922
1923         /* for right now, kernel piobufs are at end, so port 1 is at 0 */
1924         if (pd->port_port <= dd->ipath_ports_extrabuf)
1925                 pd->port_pio_base = (dd->ipath_pbufsport + 1)
1926                         * (pd->port_port - 1);
1927         else
1928                 pd->port_pio_base = dd->ipath_ports_extrabuf +
1929                         dd->ipath_pbufsport * (pd->port_port - 1);
1930         pd->port_piobufs = dd->ipath_piobufbase +
1931                 pd->port_pio_base * dd->ipath_palign;
1932         ipath_cdbg(VERBOSE, "piobuf base for port %u is 0x%x, piocnt %u,"
1933                 " first pio %u\n", pd->port_port, pd->port_piobufs,
1934                 pd->port_piocnt, pd->port_pio_base);
1935         ipath_chg_pioavailkernel(dd, pd->port_pio_base, pd->port_piocnt, 0);
1936
1937         /*
1938          * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1939          * array for time being.  If pd->port_port > chip-supported,
1940          * we need to do extra stuff here to handle by handling overflow
1941          * through port 0, someday
1942          */
1943         ret = ipath_create_rcvhdrq(dd, pd);
1944         if (!ret)
1945                 ret = ipath_create_user_egr(pd);
1946         if (ret)
1947                 goto done;
1948
1949         /*
1950          * set the eager head register for this port to the current values
1951          * of the tail pointers, since we don't know if they were
1952          * updated on last use of the port.
1953          */
1954         head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
1955         ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
1956         pd->port_lastrcvhdrqtail = -1;
1957         ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n",
1958                 pd->port_port, head32);
1959         pd->port_tidcursor = 0; /* start at beginning after open */
1960
1961         /* initialize poll variables... */
1962         pd->port_urgent = 0;
1963         pd->port_urgent_poll = 0;
1964         pd->port_hdrqfull_poll = pd->port_hdrqfull;
1965
1966         /*
1967          * Now enable the port for receive.
1968          * For chips that are set to DMA the tail register to memory
1969          * when they change (and when the update bit transitions from
1970          * 0 to 1.  So for those chips, we turn it off and then back on.
1971          * This will (very briefly) affect any other open ports, but the
1972          * duration is very short, and therefore isn't an issue.  We
1973          * explictly set the in-memory tail copy to 0 beforehand, so we
1974          * don't have to wait to be sure the DMA update has happened
1975          * (chip resets head/tail to 0 on transition to enable).
1976          */
1977         set_bit(dd->ipath_r_portenable_shift + pd->port_port,
1978                 &dd->ipath_rcvctrl);
1979         if (!(dd->ipath_flags & IPATH_NODMA_RTAIL)) {
1980                 if (pd->port_rcvhdrtail_kvaddr)
1981                         ipath_clear_rcvhdrtail(pd);
1982                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1983                         dd->ipath_rcvctrl &
1984                         ~(1ULL << dd->ipath_r_tailupd_shift));
1985         }
1986         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1987                          dd->ipath_rcvctrl);
1988         /* Notify any waiting slaves */
1989         if (pd->port_subport_cnt) {
1990                 clear_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1991                 wake_up(&pd->port_wait);
1992         }
1993 done:
1994         return ret;
1995 }
1996
1997 /**
1998  * unlock_exptid - unlock any expected TID entries port still had in use
1999  * @pd: port
2000  *
2001  * We don't actually update the chip here, because we do a bulk update
2002  * below, using ipath_f_clear_tids.
2003  */
2004 static void unlock_expected_tids(struct ipath_portdata *pd)
2005 {
2006         struct ipath_devdata *dd = pd->port_dd;
2007         int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
2008         int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
2009
2010         ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
2011                    pd->port_port);
2012         for (i = port_tidbase; i < maxtid; i++) {
2013                 struct page *ps = dd->ipath_pageshadow[i];
2014
2015                 if (!ps)
2016                         continue;
2017
2018                 dd->ipath_pageshadow[i] = NULL;
2019                 pci_unmap_page(dd->pcidev, dd->ipath_physshadow[i],
2020                         PAGE_SIZE, PCI_DMA_FROMDEVICE);
2021                 ipath_release_user_pages_on_close(&ps, 1);
2022                 cnt++;
2023                 ipath_stats.sps_pageunlocks++;
2024         }
2025         if (cnt)
2026                 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
2027                            pd->port_port, cnt);
2028
2029         if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
2030                 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
2031                            (unsigned long long) ipath_stats.sps_pagelocks,
2032                            (unsigned long long)
2033                            ipath_stats.sps_pageunlocks);
2034 }
2035
2036 static int ipath_close(struct inode *in, struct file *fp)
2037 {
2038         int ret = 0;
2039         struct ipath_filedata *fd;
2040         struct ipath_portdata *pd;
2041         struct ipath_devdata *dd;
2042         unsigned port;
2043
2044         ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
2045                    (long)in->i_rdev, fp->private_data);
2046
2047         mutex_lock(&ipath_mutex);
2048
2049         fd = (struct ipath_filedata *) fp->private_data;
2050         fp->private_data = NULL;
2051         pd = fd->pd;
2052         if (!pd) {
2053                 mutex_unlock(&ipath_mutex);
2054                 goto bail;
2055         }
2056
2057         dd = pd->port_dd;
2058
2059         /* drain user sdma queue */
2060         ipath_user_sdma_queue_drain(dd, fd->pq);
2061         ipath_user_sdma_queue_destroy(fd->pq);
2062
2063         if (--pd->port_cnt) {
2064                 /*
2065                  * XXX If the master closes the port before the slave(s),
2066                  * revoke the mmap for the eager receive queue so
2067                  * the slave(s) don't wait for receive data forever.
2068                  */
2069                 pd->active_slaves &= ~(1 << fd->subport);
2070                 put_pid(pd->port_subpid[fd->subport]);
2071                 pd->port_subpid[fd->subport] = NULL;
2072                 mutex_unlock(&ipath_mutex);
2073                 goto bail;
2074         }
2075         port = pd->port_port;
2076
2077         if (pd->port_hdrqfull) {
2078                 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
2079                            "during run\n", pd->port_comm, pid_nr(pd->port_pid),
2080                            pd->port_hdrqfull);
2081                 pd->port_hdrqfull = 0;
2082         }
2083
2084         if (pd->port_rcvwait_to || pd->port_piowait_to
2085             || pd->port_rcvnowait || pd->port_pionowait) {
2086                 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
2087                            "%u rcv %u, pio already\n",
2088                            pd->port_port, pd->port_rcvwait_to,
2089                            pd->port_piowait_to, pd->port_rcvnowait,
2090                            pd->port_pionowait);
2091                 pd->port_rcvwait_to = pd->port_piowait_to =
2092                         pd->port_rcvnowait = pd->port_pionowait = 0;
2093         }
2094         if (pd->port_flag) {
2095                 ipath_cdbg(PROC, "port %u port_flag set: 0x%lx\n",
2096                           pd->port_port, pd->port_flag);
2097                 pd->port_flag = 0;
2098         }
2099
2100         if (dd->ipath_kregbase) {
2101                 /* atomically clear receive enable port and intr avail. */
2102                 clear_bit(dd->ipath_r_portenable_shift + port,
2103                           &dd->ipath_rcvctrl);
2104                 clear_bit(pd->port_port + dd->ipath_r_intravail_shift,
2105                           &dd->ipath_rcvctrl);
2106                 ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
2107                         dd->ipath_rcvctrl);
2108                 /* and read back from chip to be sure that nothing
2109                  * else is in flight when we do the rest */
2110                 (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
2111
2112                 /* clean up the pkeys for this port user */
2113                 ipath_clean_part_key(pd, dd);
2114                 /*
2115                  * be paranoid, and never write 0's to these, just use an
2116                  * unused part of the port 0 tail page.  Of course,
2117                  * rcvhdraddr points to a large chunk of memory, so this
2118                  * could still trash things, but at least it won't trash
2119                  * page 0, and by disabling the port, it should stop "soon",
2120                  * even if a packet or two is in already in flight after we
2121                  * disabled the port.
2122                  */
2123                 ipath_write_kreg_port(dd,
2124                         dd->ipath_kregs->kr_rcvhdrtailaddr, port,
2125                         dd->ipath_dummy_hdrq_phys);
2126                 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
2127                         pd->port_port, dd->ipath_dummy_hdrq_phys);
2128
2129                 ipath_disarm_piobufs(dd, pd->port_pio_base, pd->port_piocnt);
2130                 ipath_chg_pioavailkernel(dd, pd->port_pio_base,
2131                         pd->port_piocnt, 1);
2132
2133                 dd->ipath_f_clear_tids(dd, pd->port_port);
2134
2135                 if (dd->ipath_pageshadow)
2136                         unlock_expected_tids(pd);
2137                 ipath_stats.sps_ports--;
2138                 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
2139                            pd->port_comm, pid_nr(pd->port_pid),
2140                            dd->ipath_unit, port);
2141         }
2142
2143         put_pid(pd->port_pid);
2144         pd->port_pid = NULL;
2145         dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */
2146         mutex_unlock(&ipath_mutex);
2147         ipath_free_pddata(dd, pd); /* after releasing the mutex */
2148
2149 bail:
2150         kfree(fd);
2151         return ret;
2152 }
2153
2154 static int ipath_port_info(struct ipath_portdata *pd, u16 subport,
2155                            struct ipath_port_info __user *uinfo)
2156 {
2157         struct ipath_port_info info;
2158         int nup;
2159         int ret;
2160         size_t sz;
2161
2162         (void) ipath_count_units(NULL, &nup, NULL);
2163         info.num_active = nup;
2164         info.unit = pd->port_dd->ipath_unit;
2165         info.port = pd->port_port;
2166         info.subport = subport;
2167         /* Don't return new fields if old library opened the port. */
2168         if (ipath_supports_subports(pd->userversion >> 16,
2169                                     pd->userversion & 0xffff)) {
2170                 /* Number of user ports available for this device. */
2171                 info.num_ports = pd->port_dd->ipath_cfgports - 1;
2172                 info.num_subports = pd->port_subport_cnt;
2173                 sz = sizeof(info);
2174         } else
2175                 sz = sizeof(info) - 2 * sizeof(u16);
2176
2177         if (copy_to_user(uinfo, &info, sz)) {
2178                 ret = -EFAULT;
2179                 goto bail;
2180         }
2181         ret = 0;
2182
2183 bail:
2184         return ret;
2185 }
2186
2187 static int ipath_get_slave_info(struct ipath_portdata *pd,
2188                                 void __user *slave_mask_addr)
2189 {
2190         int ret = 0;
2191
2192         if (copy_to_user(slave_mask_addr, &pd->active_slaves, sizeof(u32)))
2193                 ret = -EFAULT;
2194         return ret;
2195 }
2196
2197 static int ipath_sdma_get_inflight(struct ipath_user_sdma_queue *pq,
2198                                    u32 __user *inflightp)
2199 {
2200         const u32 val = ipath_user_sdma_inflight_counter(pq);
2201
2202         if (put_user(val, inflightp))
2203                 return -EFAULT;
2204
2205         return 0;
2206 }
2207
2208 static int ipath_sdma_get_complete(struct ipath_devdata *dd,
2209                                    struct ipath_user_sdma_queue *pq,
2210                                    u32 __user *completep)
2211 {
2212         u32 val;
2213         int err;
2214
2215         err = ipath_user_sdma_make_progress(dd, pq);
2216         if (err < 0)
2217                 return err;
2218
2219         val = ipath_user_sdma_complete_counter(pq);
2220         if (put_user(val, completep))
2221                 return -EFAULT;
2222
2223         return 0;
2224 }
2225
2226 static ssize_t ipath_write(struct file *fp, const char __user *data,
2227                            size_t count, loff_t *off)
2228 {
2229         const struct ipath_cmd __user *ucmd;
2230         struct ipath_portdata *pd;
2231         const void __user *src;
2232         size_t consumed, copy;
2233         struct ipath_cmd cmd;
2234         ssize_t ret = 0;
2235         void *dest;
2236
2237         if (count < sizeof(cmd.type)) {
2238                 ret = -EINVAL;
2239                 goto bail;
2240         }
2241
2242         ucmd = (const struct ipath_cmd __user *) data;
2243
2244         if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
2245                 ret = -EFAULT;
2246                 goto bail;
2247         }
2248
2249         consumed = sizeof(cmd.type);
2250
2251         switch (cmd.type) {
2252         case IPATH_CMD_ASSIGN_PORT:
2253         case __IPATH_CMD_USER_INIT:
2254         case IPATH_CMD_USER_INIT:
2255                 copy = sizeof(cmd.cmd.user_info);
2256                 dest = &cmd.cmd.user_info;
2257                 src = &ucmd->cmd.user_info;
2258                 break;
2259         case IPATH_CMD_RECV_CTRL:
2260                 copy = sizeof(cmd.cmd.recv_ctrl);
2261                 dest = &cmd.cmd.recv_ctrl;
2262                 src = &ucmd->cmd.recv_ctrl;
2263                 break;
2264         case IPATH_CMD_PORT_INFO:
2265                 copy = sizeof(cmd.cmd.port_info);
2266                 dest = &cmd.cmd.port_info;
2267                 src = &ucmd->cmd.port_info;
2268                 break;
2269         case IPATH_CMD_TID_UPDATE:
2270         case IPATH_CMD_TID_FREE:
2271                 copy = sizeof(cmd.cmd.tid_info);
2272                 dest = &cmd.cmd.tid_info;
2273                 src = &ucmd->cmd.tid_info;
2274                 break;
2275         case IPATH_CMD_SET_PART_KEY:
2276                 copy = sizeof(cmd.cmd.part_key);
2277                 dest = &cmd.cmd.part_key;
2278                 src = &ucmd->cmd.part_key;
2279                 break;
2280         case __IPATH_CMD_SLAVE_INFO:
2281                 copy = sizeof(cmd.cmd.slave_mask_addr);
2282                 dest = &cmd.cmd.slave_mask_addr;
2283                 src = &ucmd->cmd.slave_mask_addr;
2284                 break;
2285         case IPATH_CMD_PIOAVAILUPD:     // force an update of PIOAvail reg
2286                 copy = 0;
2287                 src = NULL;
2288                 dest = NULL;
2289                 break;
2290         case IPATH_CMD_POLL_TYPE:
2291                 copy = sizeof(cmd.cmd.poll_type);
2292                 dest = &cmd.cmd.poll_type;
2293                 src = &ucmd->cmd.poll_type;
2294                 break;
2295         case IPATH_CMD_ARMLAUNCH_CTRL:
2296                 copy = sizeof(cmd.cmd.armlaunch_ctrl);
2297                 dest = &cmd.cmd.armlaunch_ctrl;
2298                 src = &ucmd->cmd.armlaunch_ctrl;
2299                 break;
2300         case IPATH_CMD_SDMA_INFLIGHT:
2301                 copy = sizeof(cmd.cmd.sdma_inflight);
2302                 dest = &cmd.cmd.sdma_inflight;
2303                 src = &ucmd->cmd.sdma_inflight;
2304                 break;
2305         case IPATH_CMD_SDMA_COMPLETE:
2306                 copy = sizeof(cmd.cmd.sdma_complete);
2307                 dest = &cmd.cmd.sdma_complete;
2308                 src = &ucmd->cmd.sdma_complete;
2309                 break;
2310         default:
2311                 ret = -EINVAL;
2312                 goto bail;
2313         }
2314
2315         if (copy) {
2316                 if ((count - consumed) < copy) {
2317                         ret = -EINVAL;
2318                         goto bail;
2319                 }
2320
2321                 if (copy_from_user(dest, src, copy)) {
2322                         ret = -EFAULT;
2323                         goto bail;
2324                 }
2325
2326                 consumed += copy;
2327         }
2328
2329         pd = port_fp(fp);
2330         if (!pd && cmd.type != __IPATH_CMD_USER_INIT &&
2331                 cmd.type != IPATH_CMD_ASSIGN_PORT) {
2332                 ret = -EINVAL;
2333                 goto bail;
2334         }
2335
2336         switch (cmd.type) {
2337         case IPATH_CMD_ASSIGN_PORT:
2338                 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2339                 if (ret)
2340                         goto bail;
2341                 break;
2342         case __IPATH_CMD_USER_INIT:
2343                 /* backwards compatibility, get port first */
2344                 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2345                 if (ret)
2346                         goto bail;
2347                 /* and fall through to current version. */
2348         case IPATH_CMD_USER_INIT:
2349                 ret = ipath_do_user_init(fp, &cmd.cmd.user_info);
2350                 if (ret)
2351                         goto bail;
2352                 ret = ipath_get_base_info(
2353                         fp, (void __user *) (unsigned long)
2354                         cmd.cmd.user_info.spu_base_info,
2355                         cmd.cmd.user_info.spu_base_info_size);
2356                 break;
2357         case IPATH_CMD_RECV_CTRL:
2358                 ret = ipath_manage_rcvq(pd, subport_fp(fp), cmd.cmd.recv_ctrl);
2359                 break;
2360         case IPATH_CMD_PORT_INFO:
2361                 ret = ipath_port_info(pd, subport_fp(fp),
2362                                       (struct ipath_port_info __user *)
2363                                       (unsigned long) cmd.cmd.port_info);
2364                 break;
2365         case IPATH_CMD_TID_UPDATE:
2366                 ret = ipath_tid_update(pd, fp, &cmd.cmd.tid_info);
2367                 break;
2368         case IPATH_CMD_TID_FREE:
2369                 ret = ipath_tid_free(pd, subport_fp(fp), &cmd.cmd.tid_info);
2370                 break;
2371         case IPATH_CMD_SET_PART_KEY:
2372                 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
2373                 break;
2374         case __IPATH_CMD_SLAVE_INFO:
2375                 ret = ipath_get_slave_info(pd,
2376                                            (void __user *) (unsigned long)
2377                                            cmd.cmd.slave_mask_addr);
2378                 break;
2379         case IPATH_CMD_PIOAVAILUPD:
2380                 ipath_force_pio_avail_update(pd->port_dd);
2381                 break;
2382         case IPATH_CMD_POLL_TYPE:
2383                 pd->poll_type = cmd.cmd.poll_type;
2384                 break;
2385         case IPATH_CMD_ARMLAUNCH_CTRL:
2386                 if (cmd.cmd.armlaunch_ctrl)
2387                         ipath_enable_armlaunch(pd->port_dd);
2388                 else
2389                         ipath_disable_armlaunch(pd->port_dd);
2390                 break;
2391         case IPATH_CMD_SDMA_INFLIGHT:
2392                 ret = ipath_sdma_get_inflight(user_sdma_queue_fp(fp),
2393                                               (u32 __user *) (unsigned long)
2394                                               cmd.cmd.sdma_inflight);
2395                 break;
2396         case IPATH_CMD_SDMA_COMPLETE:
2397                 ret = ipath_sdma_get_complete(pd->port_dd,
2398                                               user_sdma_queue_fp(fp),
2399                                               (u32 __user *) (unsigned long)
2400                                               cmd.cmd.sdma_complete);
2401                 break;
2402         }
2403
2404         if (ret >= 0)
2405                 ret = consumed;
2406
2407 bail:
2408         return ret;
2409 }
2410
2411 static ssize_t ipath_writev(struct kiocb *iocb, const struct iovec *iov,
2412                             unsigned long dim, loff_t off)
2413 {
2414         struct file *filp = iocb->ki_filp;
2415         struct ipath_filedata *fp = filp->private_data;
2416         struct ipath_portdata *pd = port_fp(filp);
2417         struct ipath_user_sdma_queue *pq = fp->pq;
2418
2419         if (!dim)
2420                 return -EINVAL;
2421
2422         return ipath_user_sdma_writev(pd->port_dd, pq, iov, dim);
2423 }
2424
2425 static struct class *ipath_class;
2426
2427 static int init_cdev(int minor, char *name, const struct file_operations *fops,
2428                      struct cdev **cdevp, struct device **devp)
2429 {
2430         const dev_t dev = MKDEV(IPATH_MAJOR, minor);
2431         struct cdev *cdev = NULL;
2432         struct device *device = NULL;
2433         int ret;
2434
2435         cdev = cdev_alloc();
2436         if (!cdev) {
2437                 printk(KERN_ERR IPATH_DRV_NAME
2438                        ": Could not allocate cdev for minor %d, %s\n",
2439                        minor, name);
2440                 ret = -ENOMEM;
2441                 goto done;
2442         }
2443
2444         cdev->owner = THIS_MODULE;
2445         cdev->ops = fops;
2446         kobject_set_name(&cdev->kobj, name);
2447
2448         ret = cdev_add(cdev, dev, 1);
2449         if (ret < 0) {
2450                 printk(KERN_ERR IPATH_DRV_NAME
2451                        ": Could not add cdev for minor %d, %s (err %d)\n",
2452                        minor, name, -ret);
2453                 goto err_cdev;
2454         }
2455
2456         device = device_create(ipath_class, NULL, dev, name);
2457
2458         if (IS_ERR(device)) {
2459                 ret = PTR_ERR(device);
2460                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2461                        "device for minor %d, %s (err %d)\n",
2462                        minor, name, -ret);
2463                 goto err_cdev;
2464         }
2465
2466         goto done;
2467
2468 err_cdev:
2469         cdev_del(cdev);
2470         cdev = NULL;
2471
2472 done:
2473         if (ret >= 0) {
2474                 *cdevp = cdev;
2475                 *devp = device;
2476         } else {
2477                 *cdevp = NULL;
2478                 *devp = NULL;
2479         }
2480
2481         return ret;
2482 }
2483
2484 int ipath_cdev_init(int minor, char *name, const struct file_operations *fops,
2485                     struct cdev **cdevp, struct device **devp)
2486 {
2487         return init_cdev(minor, name, fops, cdevp, devp);
2488 }
2489
2490 static void cleanup_cdev(struct cdev **cdevp,
2491                          struct device **devp)
2492 {
2493         struct device *dev = *devp;
2494
2495         if (dev) {
2496                 device_unregister(dev);
2497                 *devp = NULL;
2498         }
2499
2500         if (*cdevp) {
2501                 cdev_del(*cdevp);
2502                 *cdevp = NULL;
2503         }
2504 }
2505
2506 void ipath_cdev_cleanup(struct cdev **cdevp,
2507                         struct device **devp)
2508 {
2509         cleanup_cdev(cdevp, devp);
2510 }
2511
2512 static struct cdev *wildcard_cdev;
2513 static struct device *wildcard_dev;
2514
2515 static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
2516
2517 static int user_init(void)
2518 {
2519         int ret;
2520
2521         ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
2522         if (ret < 0) {
2523                 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
2524                        "chrdev region (err %d)\n", -ret);
2525                 goto done;
2526         }
2527
2528         ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
2529
2530         if (IS_ERR(ipath_class)) {
2531                 ret = PTR_ERR(ipath_class);
2532                 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2533                        "device class (err %d)\n", -ret);
2534                 goto bail;
2535         }
2536
2537         goto done;
2538 bail:
2539         unregister_chrdev_region(dev, IPATH_NMINORS);
2540 done:
2541         return ret;
2542 }
2543
2544 static void user_cleanup(void)
2545 {
2546         if (ipath_class) {
2547                 class_destroy(ipath_class);
2548                 ipath_class = NULL;
2549         }
2550
2551         unregister_chrdev_region(dev, IPATH_NMINORS);
2552 }
2553
2554 static atomic_t user_count = ATOMIC_INIT(0);
2555 static atomic_t user_setup = ATOMIC_INIT(0);
2556
2557 int ipath_user_add(struct ipath_devdata *dd)
2558 {
2559         char name[10];
2560         int ret;
2561
2562         if (atomic_inc_return(&user_count) == 1) {
2563                 ret = user_init();
2564                 if (ret < 0) {
2565                         ipath_dev_err(dd, "Unable to set up user support: "
2566                                       "error %d\n", -ret);
2567                         goto bail;
2568                 }
2569                 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
2570                                 &wildcard_dev);
2571                 if (ret < 0) {
2572                         ipath_dev_err(dd, "Could not create wildcard "
2573                                       "minor: error %d\n", -ret);
2574                         goto bail_user;
2575                 }
2576
2577                 atomic_set(&user_setup, 1);
2578         }
2579
2580         snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
2581
2582         ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
2583                         &dd->user_cdev, &dd->user_dev);
2584         if (ret < 0)
2585                 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
2586                               dd->ipath_unit + 1, name);
2587
2588         goto bail;
2589
2590 bail_user:
2591         user_cleanup();
2592 bail:
2593         return ret;
2594 }
2595
2596 void ipath_user_remove(struct ipath_devdata *dd)
2597 {
2598         cleanup_cdev(&dd->user_cdev, &dd->user_dev);
2599
2600         if (atomic_dec_return(&user_count) == 0) {
2601                 if (atomic_read(&user_setup) == 0)
2602                         goto bail;
2603
2604                 cleanup_cdev(&wildcard_cdev, &wildcard_dev);
2605                 user_cleanup();
2606
2607                 atomic_set(&user_setup, 0);
2608         }
2609 bail:
2610         return;
2611 }