aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw
diff options
context:
space:
mode:
authorBryan O'Sullivan <bos@pathscale.com>2006-03-29 18:23:31 -0500
committerRoland Dreier <rolandd@cisco.com>2006-03-31 16:14:19 -0500
commit7f510b46e4771cfb89af134b3aa827d46125a2ce (patch)
tree09eb48dbf5d81e94d778b44b004cb9b7f242ff0b /drivers/infiniband/hw
parent3e9b4a5eb4ae4936feeea256c0105e078c7702cd (diff)
IB/ipath: support for userspace apps using core driver
These files introduce a char device that userspace apps use to gain direct memory-mapped access to the InfiniPath hardware, and routines for pinning and unpinning user memory in cases where the hardware needs to DMA into the user address space. Signed-off-by: Bryan O'Sullivan <bos@pathscale.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_file_ops.c1910
-rw-r--r--drivers/infiniband/hw/ipath/ipath_user_pages.c207
2 files changed, 2117 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c
new file mode 100644
index 000000000000..c347191f02bf
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c
@@ -0,0 +1,1910 @@
1/*
2 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/pci.h>
34#include <linux/poll.h>
35#include <linux/cdev.h>
36#include <linux/swap.h>
37#include <linux/vmalloc.h>
38#include <asm/pgtable.h>
39
40#include "ipath_kernel.h"
41#include "ips_common.h"
42#include "ipath_layer.h"
43
44static int ipath_open(struct inode *, struct file *);
45static int ipath_close(struct inode *, struct file *);
46static ssize_t ipath_write(struct file *, const char __user *, size_t,
47 loff_t *);
48static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
49static int ipath_mmap(struct file *, struct vm_area_struct *);
50
51static struct file_operations ipath_file_ops = {
52 .owner = THIS_MODULE,
53 .write = ipath_write,
54 .open = ipath_open,
55 .release = ipath_close,
56 .poll = ipath_poll,
57 .mmap = ipath_mmap
58};
59
60static int ipath_get_base_info(struct ipath_portdata *pd,
61 void __user *ubase, size_t ubase_size)
62{
63 int ret = 0;
64 struct ipath_base_info *kinfo = NULL;
65 struct ipath_devdata *dd = pd->port_dd;
66
67 if (ubase_size < sizeof(*kinfo)) {
68 ipath_cdbg(PROC,
69 "Base size %lu, need %lu (version mismatch?)\n",
70 (unsigned long) ubase_size,
71 (unsigned long) sizeof(*kinfo));
72 ret = -EINVAL;
73 goto bail;
74 }
75
76 kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
77 if (kinfo == NULL) {
78 ret = -ENOMEM;
79 goto bail;
80 }
81
82 ret = dd->ipath_f_get_base_info(pd, kinfo);
83 if (ret < 0)
84 goto bail;
85
86 kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
87 kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
88 kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
89 kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
90 /*
91 * have to mmap whole thing
92 */
93 kinfo->spi_rcv_egrbuftotlen =
94 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
95 kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
96 kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
97 pd->port_rcvegrbuf_chunks;
98 kinfo->spi_tidcnt = dd->ipath_rcvtidcnt;
99 /*
100 * for this use, may be ipath_cfgports summed over all chips that
101 * are are configured and present
102 */
103 kinfo->spi_nports = dd->ipath_cfgports;
104 /* unit (chip/board) our port is on */
105 kinfo->spi_unit = dd->ipath_unit;
106 /* for now, only a single page */
107 kinfo->spi_tid_maxsize = PAGE_SIZE;
108
109 /*
110 * Doing this per port, and based on the skip value, etc. This has
111 * to be the actual buffer size, since the protocol code treats it
112 * as an array.
113 *
114 * These have to be set to user addresses in the user code via mmap.
115 * These values are used on return to user code for the mmap target
116 * addresses only. For 32 bit, same 44 bit address problem, so use
117 * the physical address, not virtual. Before 2.6.11, using the
118 * page_address() macro worked, but in 2.6.11, even that returns the
119 * full 64 bit address (upper bits all 1's). So far, using the
120 * physical addresses (or chip offsets, for chip mapping) works, but
121 * no doubt some future kernel release will chang that, and we'll be
122 * on to yet another method of dealing with this
123 */
124 kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
125 kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
126 kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
127 kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
128 (void *) dd->ipath_statusp -
129 (void *) dd->ipath_pioavailregs_dma;
130 kinfo->spi_piobufbase = (u64) pd->port_piobufs;
131 kinfo->__spi_uregbase =
132 dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
133
134 kinfo->spi_pioindex = dd->ipath_pbufsport * (pd->port_port - 1);
135 kinfo->spi_piocnt = dd->ipath_pbufsport;
136 kinfo->spi_pioalign = dd->ipath_palign;
137
138 kinfo->spi_qpair = IPATH_KD_QP;
139 kinfo->spi_piosize = dd->ipath_ibmaxlen;
140 kinfo->spi_mtu = dd->ipath_ibmaxlen; /* maxlen, not ibmtu */
141 kinfo->spi_port = pd->port_port;
142 kinfo->spi_sw_version = IPATH_USER_SWVERSION;
143 kinfo->spi_hw_version = dd->ipath_revision;
144
145 if (copy_to_user(ubase, kinfo, sizeof(*kinfo)))
146 ret = -EFAULT;
147
148bail:
149 kfree(kinfo);
150 return ret;
151}
152
153/**
154 * ipath_tid_update - update a port TID
155 * @pd: the port
156 * @ti: the TID information
157 *
158 * The new implementation as of Oct 2004 is that the driver assigns
159 * the tid and returns it to the caller. To make it easier to
160 * catch bugs, and to reduce search time, we keep a cursor for
161 * each port, walking the shadow tid array to find one that's not
162 * in use.
163 *
164 * For now, if we can't allocate the full list, we fail, although
165 * in the long run, we'll allocate as many as we can, and the
166 * caller will deal with that by trying the remaining pages later.
167 * That means that when we fail, we have to mark the tids as not in
168 * use again, in our shadow copy.
169 *
170 * It's up to the caller to free the tids when they are done.
171 * We'll unlock the pages as they free them.
172 *
173 * Also, right now we are locking one page at a time, but since
174 * the intended use of this routine is for a single group of
175 * virtually contiguous pages, that should change to improve
176 * performance.
177 */
178static int ipath_tid_update(struct ipath_portdata *pd,
179 const struct ipath_tid_info *ti)
180{
181 int ret = 0, ntids;
182 u32 tid, porttid, cnt, i, tidcnt;
183 u16 *tidlist;
184 struct ipath_devdata *dd = pd->port_dd;
185 u64 physaddr;
186 unsigned long vaddr;
187 u64 __iomem *tidbase;
188 unsigned long tidmap[8];
189 struct page **pagep = NULL;
190
191 if (!dd->ipath_pageshadow) {
192 ret = -ENOMEM;
193 goto done;
194 }
195
196 cnt = ti->tidcnt;
197 if (!cnt) {
198 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
199 (unsigned long long) ti->tidlist);
200 /*
201 * Should we treat as success? likely a bug
202 */
203 ret = -EFAULT;
204 goto done;
205 }
206 tidcnt = dd->ipath_rcvtidcnt;
207 if (cnt >= tidcnt) {
208 /* make sure it all fits in port_tid_pg_list */
209 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
210 "TIDs, only trying max (%u)\n", cnt, tidcnt);
211 cnt = tidcnt;
212 }
213 pagep = (struct page **)pd->port_tid_pg_list;
214 tidlist = (u16 *) (&pagep[cnt]);
215
216 memset(tidmap, 0, sizeof(tidmap));
217 tid = pd->port_tidcursor;
218 /* before decrement; chip actual # */
219 porttid = pd->port_port * tidcnt;
220 ntids = tidcnt;
221 tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
222 dd->ipath_rcvtidbase +
223 porttid * sizeof(*tidbase));
224
225 ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
226 pd->port_port, cnt, tid, tidbase);
227
228 /* virtual address of first page in transfer */
229 vaddr = ti->tidvaddr;
230 if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
231 cnt * PAGE_SIZE)) {
232 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
233 (void *)vaddr, cnt);
234 ret = -EFAULT;
235 goto done;
236 }
237 ret = ipath_get_user_pages(vaddr, cnt, pagep);
238 if (ret) {
239 if (ret == -EBUSY) {
240 ipath_dbg("Failed to lock addr %p, %u pages "
241 "(already locked)\n",
242 (void *) vaddr, cnt);
243 /*
244 * for now, continue, and see what happens but with
245 * the new implementation, this should never happen,
246 * unless perhaps the user has mpin'ed the pages
247 * themselves (something we need to test)
248 */
249 ret = 0;
250 } else {
251 dev_info(&dd->pcidev->dev,
252 "Failed to lock addr %p, %u pages: "
253 "errno %d\n", (void *) vaddr, cnt, -ret);
254 goto done;
255 }
256 }
257 for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
258 for (; ntids--; tid++) {
259 if (tid == tidcnt)
260 tid = 0;
261 if (!dd->ipath_pageshadow[porttid + tid])
262 break;
263 }
264 if (ntids < 0) {
265 /*
266 * oops, wrapped all the way through their TIDs,
267 * and didn't have enough free; see comments at
268 * start of routine
269 */
270 ipath_dbg("Not enough free TIDs for %u pages "
271 "(index %d), failing\n", cnt, i);
272 i--; /* last tidlist[i] not filled in */
273 ret = -ENOMEM;
274 break;
275 }
276 tidlist[i] = tid;
277 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
278 "vaddr %lx\n", i, tid, vaddr);
279 /* we "know" system pages and TID pages are same size */
280 dd->ipath_pageshadow[porttid + tid] = pagep[i];
281 /*
282 * don't need atomic or it's overhead
283 */
284 __set_bit(tid, tidmap);
285 physaddr = page_to_phys(pagep[i]);
286 ipath_stats.sps_pagelocks++;
287 ipath_cdbg(VERBOSE,
288 "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
289 tid, vaddr, (unsigned long long) physaddr,
290 pagep[i]);
291 dd->ipath_f_put_tid(dd, &tidbase[tid], 1, physaddr);
292 /*
293 * don't check this tid in ipath_portshadow, since we
294 * just filled it in; start with the next one.
295 */
296 tid++;
297 }
298
299 if (ret) {
300 u32 limit;
301 cleanup:
302 /* jump here if copy out of updated info failed... */
303 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
304 -ret, i, cnt);
305 /* same code that's in ipath_free_tid() */
306 limit = sizeof(tidmap) * BITS_PER_BYTE;
307 if (limit > tidcnt)
308 /* just in case size changes in future */
309 limit = tidcnt;
310 tid = find_first_bit((const unsigned long *)tidmap, limit);
311 for (; tid < limit; tid++) {
312 if (!test_bit(tid, tidmap))
313 continue;
314 if (dd->ipath_pageshadow[porttid + tid]) {
315 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
316 tid);
317 dd->ipath_f_put_tid(dd, &tidbase[tid], 1,
318 dd->ipath_tidinvalid);
319 dd->ipath_pageshadow[porttid + tid] = NULL;
320 ipath_stats.sps_pageunlocks++;
321 }
322 }
323 ipath_release_user_pages(pagep, cnt);
324 } else {
325 /*
326 * Copy the updated array, with ipath_tid's filled in, back
327 * to user. Since we did the copy in already, this "should
328 * never fail" If it does, we have to clean up...
329 */
330 if (copy_to_user((void __user *)
331 (unsigned long) ti->tidlist,
332 tidlist, cnt * sizeof(*tidlist))) {
333 ret = -EFAULT;
334 goto cleanup;
335 }
336 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
337 tidmap, sizeof tidmap)) {
338 ret = -EFAULT;
339 goto cleanup;
340 }
341 if (tid == tidcnt)
342 tid = 0;
343 pd->port_tidcursor = tid;
344 }
345
346done:
347 if (ret)
348 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
349 ti->tidcnt, -ret);
350 return ret;
351}
352
353/**
354 * ipath_tid_free - free a port TID
355 * @pd: the port
356 * @ti: the TID info
357 *
358 * right now we are unlocking one page at a time, but since
359 * the intended use of this routine is for a single group of
360 * virtually contiguous pages, that should change to improve
361 * performance. We check that the TID is in range for this port
362 * but otherwise don't check validity; if user has an error and
363 * frees the wrong tid, it's only their own data that can thereby
364 * be corrupted. We do check that the TID was in use, for sanity
365 * We always use our idea of the saved address, not the address that
366 * they pass in to us.
367 */
368
369static int ipath_tid_free(struct ipath_portdata *pd,
370 const struct ipath_tid_info *ti)
371{
372 int ret = 0;
373 u32 tid, porttid, cnt, limit, tidcnt;
374 struct ipath_devdata *dd = pd->port_dd;
375 u64 __iomem *tidbase;
376 unsigned long tidmap[8];
377
378 if (!dd->ipath_pageshadow) {
379 ret = -ENOMEM;
380 goto done;
381 }
382
383 if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
384 sizeof tidmap)) {
385 ret = -EFAULT;
386 goto done;
387 }
388
389 porttid = pd->port_port * dd->ipath_rcvtidcnt;
390 tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
391 dd->ipath_rcvtidbase +
392 porttid * sizeof(*tidbase));
393
394 tidcnt = dd->ipath_rcvtidcnt;
395 limit = sizeof(tidmap) * BITS_PER_BYTE;
396 if (limit > tidcnt)
397 /* just in case size changes in future */
398 limit = tidcnt;
399 tid = find_first_bit(tidmap, limit);
400 ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
401 "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
402 limit, tid, porttid);
403 for (cnt = 0; tid < limit; tid++) {
404 /*
405 * small optimization; if we detect a run of 3 or so without
406 * any set, use find_first_bit again. That's mainly to
407 * accelerate the case where we wrapped, so we have some at
408 * the beginning, and some at the end, and a big gap
409 * in the middle.
410 */
411 if (!test_bit(tid, tidmap))
412 continue;
413 cnt++;
414 if (dd->ipath_pageshadow[porttid + tid]) {
415 ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
416 pd->port_pid, tid);
417 dd->ipath_f_put_tid(dd, &tidbase[tid], 1,
418 dd->ipath_tidinvalid);
419 ipath_release_user_pages(
420 &dd->ipath_pageshadow[porttid + tid], 1);
421 dd->ipath_pageshadow[porttid + tid] = NULL;
422 ipath_stats.sps_pageunlocks++;
423 } else
424 ipath_dbg("Unused tid %u, ignoring\n", tid);
425 }
426 if (cnt != ti->tidcnt)
427 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
428 ti->tidcnt, cnt);
429done:
430 if (ret)
431 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
432 ti->tidcnt, -ret);
433 return ret;
434}
435
436/**
437 * ipath_set_part_key - set a partition key
438 * @pd: the port
439 * @key: the key
440 *
441 * We can have up to 4 active at a time (other than the default, which is
442 * always allowed). This is somewhat tricky, since multiple ports may set
443 * the same key, so we reference count them, and clean up at exit. All 4
444 * partition keys are packed into a single infinipath register. It's an
445 * error for a process to set the same pkey multiple times. We provide no
446 * mechanism to de-allocate a pkey at this time, we may eventually need to
447 * do that. I've used the atomic operations, and no locking, and only make
448 * a single pass through what's available. This should be more than
449 * adequate for some time. I'll think about spinlocks or the like if and as
450 * it's necessary.
451 */
452static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
453{
454 struct ipath_devdata *dd = pd->port_dd;
455 int i, any = 0, pidx = -1;
456 u16 lkey = key & 0x7FFF;
457 int ret;
458
459 if (lkey == (IPS_DEFAULT_P_KEY & 0x7FFF)) {
460 /* nothing to do; this key always valid */
461 ret = 0;
462 goto bail;
463 }
464
465 ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
466 "%hx:%x %hx:%x %hx:%x %hx:%x\n",
467 pd->port_port, key, dd->ipath_pkeys[0],
468 atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
469 atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
470 atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
471 atomic_read(&dd->ipath_pkeyrefs[3]));
472
473 if (!lkey) {
474 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
475 pd->port_port);
476 ret = -EINVAL;
477 goto bail;
478 }
479
480 /*
481 * Set the full membership bit, because it has to be
482 * set in the register or the packet, and it seems
483 * cleaner to set in the register than to force all
484 * callers to set it. (see bug 4331)
485 */
486 key |= 0x8000;
487
488 for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
489 if (!pd->port_pkeys[i] && pidx == -1)
490 pidx = i;
491 if (pd->port_pkeys[i] == key) {
492 ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
493 "(%x) more than once\n",
494 pd->port_port, key);
495 ret = -EEXIST;
496 goto bail;
497 }
498 }
499 if (pidx == -1) {
500 ipath_dbg("All pkeys for port %u already in use, "
501 "can't set %x\n", pd->port_port, key);
502 ret = -EBUSY;
503 goto bail;
504 }
505 for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
506 if (!dd->ipath_pkeys[i]) {
507 any++;
508 continue;
509 }
510 if (dd->ipath_pkeys[i] == key) {
511 atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
512
513 if (atomic_inc_return(pkrefs) > 1) {
514 pd->port_pkeys[pidx] = key;
515 ipath_cdbg(VERBOSE, "p%u set key %x "
516 "matches #%d, count now %d\n",
517 pd->port_port, key, i,
518 atomic_read(pkrefs));
519 ret = 0;
520 goto bail;
521 } else {
522 /*
523 * lost race, decrement count, catch below
524 */
525 atomic_dec(pkrefs);
526 ipath_cdbg(VERBOSE, "Lost race, count was "
527 "0, after dec, it's %d\n",
528 atomic_read(pkrefs));
529 any++;
530 }
531 }
532 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
533 /*
534 * It makes no sense to have both the limited and
535 * full membership PKEY set at the same time since
536 * the unlimited one will disable the limited one.
537 */
538 ret = -EEXIST;
539 goto bail;
540 }
541 }
542 if (!any) {
543 ipath_dbg("port %u, all pkeys already in use, "
544 "can't set %x\n", pd->port_port, key);
545 ret = -EBUSY;
546 goto bail;
547 }
548 for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
549 if (!dd->ipath_pkeys[i] &&
550 atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
551 u64 pkey;
552
553 /* for ipathstats, etc. */
554 ipath_stats.sps_pkeys[i] = lkey;
555 pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
556 pkey =
557 (u64) dd->ipath_pkeys[0] |
558 ((u64) dd->ipath_pkeys[1] << 16) |
559 ((u64) dd->ipath_pkeys[2] << 32) |
560 ((u64) dd->ipath_pkeys[3] << 48);
561 ipath_cdbg(PROC, "p%u set key %x in #%d, "
562 "portidx %d, new pkey reg %llx\n",
563 pd->port_port, key, i, pidx,
564 (unsigned long long) pkey);
565 ipath_write_kreg(
566 dd, dd->ipath_kregs->kr_partitionkey, pkey);
567
568 ret = 0;
569 goto bail;
570 }
571 }
572 ipath_dbg("port %u, all pkeys already in use 2nd pass, "
573 "can't set %x\n", pd->port_port, key);
574 ret = -EBUSY;
575
576bail:
577 return ret;
578}
579
580/**
581 * ipath_manage_rcvq - manage a port's receive queue
582 * @pd: the port
583 * @start_stop: action to carry out
584 *
585 * start_stop == 0 disables receive on the port, for use in queue
586 * overflow conditions. start_stop==1 re-enables, to be used to
587 * re-init the software copy of the head register
588 */
589static int ipath_manage_rcvq(struct ipath_portdata *pd, int start_stop)
590{
591 struct ipath_devdata *dd = pd->port_dd;
592 u64 tval;
593
594 ipath_cdbg(PROC, "%sabling rcv for unit %u port %u\n",
595 start_stop ? "en" : "dis", dd->ipath_unit,
596 pd->port_port);
597 /* atomically clear receive enable port. */
598 if (start_stop) {
599 /*
600 * On enable, force in-memory copy of the tail register to
601 * 0, so that protocol code doesn't have to worry about
602 * whether or not the chip has yet updated the in-memory
603 * copy or not on return from the system call. The chip
604 * always resets it's tail register back to 0 on a
605 * transition from disabled to enabled. This could cause a
606 * problem if software was broken, and did the enable w/o
607 * the disable, but eventually the in-memory copy will be
608 * updated and correct itself, even in the face of software
609 * bugs.
610 */
611 *pd->port_rcvhdrtail_kvaddr = 0;
612 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
613 &dd->ipath_rcvctrl);
614 } else
615 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
616 &dd->ipath_rcvctrl);
617 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
618 dd->ipath_rcvctrl);
619 /* now be sure chip saw it before we return */
620 tval = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
621 if (start_stop) {
622 /*
623 * And try to be sure that tail reg update has happened too.
624 * This should in theory interlock with the RXE changes to
625 * the tail register. Don't assign it to the tail register
626 * in memory copy, since we could overwrite an update by the
627 * chip if we did.
628 */
629 tval = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
630 }
631 /* always; new head should be equal to new tail; see above */
632 return 0;
633}
634
635static void ipath_clean_part_key(struct ipath_portdata *pd,
636 struct ipath_devdata *dd)
637{
638 int i, j, pchanged = 0;
639 u64 oldpkey;
640
641 /* for debugging only */
642 oldpkey = (u64) dd->ipath_pkeys[0] |
643 ((u64) dd->ipath_pkeys[1] << 16) |
644 ((u64) dd->ipath_pkeys[2] << 32) |
645 ((u64) dd->ipath_pkeys[3] << 48);
646
647 for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
648 if (!pd->port_pkeys[i])
649 continue;
650 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
651 pd->port_pkeys[i]);
652 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
653 /* check for match independent of the global bit */
654 if ((dd->ipath_pkeys[j] & 0x7fff) !=
655 (pd->port_pkeys[i] & 0x7fff))
656 continue;
657 if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
658 ipath_cdbg(VERBOSE, "p%u clear key "
659 "%x matches #%d\n",
660 pd->port_port,
661 pd->port_pkeys[i], j);
662 ipath_stats.sps_pkeys[j] =
663 dd->ipath_pkeys[j] = 0;
664 pchanged++;
665 }
666 else ipath_cdbg(
667 VERBOSE, "p%u key %x matches #%d, "
668 "but ref still %d\n", pd->port_port,
669 pd->port_pkeys[i], j,
670 atomic_read(&dd->ipath_pkeyrefs[j]));
671 break;
672 }
673 pd->port_pkeys[i] = 0;
674 }
675 if (pchanged) {
676 u64 pkey = (u64) dd->ipath_pkeys[0] |
677 ((u64) dd->ipath_pkeys[1] << 16) |
678 ((u64) dd->ipath_pkeys[2] << 32) |
679 ((u64) dd->ipath_pkeys[3] << 48);
680 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
681 "new pkey reg %llx\n", pd->port_port,
682 (unsigned long long) oldpkey,
683 (unsigned long long) pkey);
684 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
685 pkey);
686 }
687}
688
689/**
690 * ipath_create_user_egr - allocate eager TID buffers
691 * @pd: the port to allocate TID buffers for
692 *
693 * This routine is now quite different for user and kernel, because
694 * the kernel uses skb's, for the accelerated network performance
695 * This is the user port version
696 *
697 * Allocate the eager TID buffers and program them into infinipath
698 * They are no longer completely contiguous, we do multiple allocation
699 * calls.
700 */
701static int ipath_create_user_egr(struct ipath_portdata *pd)
702{
703 struct ipath_devdata *dd = pd->port_dd;
704 unsigned e, egrcnt, alloced, egrperchunk, chunk, egrsize, egroff;
705 size_t size;
706 int ret;
707
708 egrcnt = dd->ipath_rcvegrcnt;
709 /* TID number offset for this port */
710 egroff = pd->port_port * egrcnt;
711 egrsize = dd->ipath_rcvegrbufsize;
712 ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
713 "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
714
715 /*
716 * to avoid wasting a lot of memory, we allocate 32KB chunks of
717 * physically contiguous memory, advance through it until used up
718 * and then allocate more. Of course, we need memory to store those
719 * extra pointers, now. Started out with 256KB, but under heavy
720 * memory pressure (creating large files and then copying them over
721 * NFS while doing lots of MPI jobs), we hit some allocation
722 * failures, even though we can sleep... (2.6.10) Still get
723 * failures at 64K. 32K is the lowest we can go without waiting
724 * more memory again. It seems likely that the coalescing in
725 * free_pages, etc. still has issues (as it has had previously
726 * during 2.6.x development).
727 */
728 size = 0x8000;
729 alloced = ALIGN(egrsize * egrcnt, size);
730 egrperchunk = size / egrsize;
731 chunk = (egrcnt + egrperchunk - 1) / egrperchunk;
732 pd->port_rcvegrbuf_chunks = chunk;
733 pd->port_rcvegrbufs_perchunk = egrperchunk;
734 pd->port_rcvegrbuf_size = size;
735 pd->port_rcvegrbuf = vmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]));
736 if (!pd->port_rcvegrbuf) {
737 ret = -ENOMEM;
738 goto bail;
739 }
740 pd->port_rcvegrbuf_phys =
741 vmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]));
742 if (!pd->port_rcvegrbuf_phys) {
743 ret = -ENOMEM;
744 goto bail_rcvegrbuf;
745 }
746 for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
747 /*
748 * GFP_USER, but without GFP_FS, so buffer cache can be
749 * coalesced (we hope); otherwise, even at order 4,
750 * heavy filesystem activity makes these fail
751 */
752 gfp_t gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
753
754 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
755 &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
756 gfp_flags);
757
758 if (!pd->port_rcvegrbuf[e]) {
759 ret = -ENOMEM;
760 goto bail_rcvegrbuf_phys;
761 }
762 }
763
764 pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
765
766 for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
767 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
768 unsigned i;
769
770 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
771 dd->ipath_f_put_tid(dd, e + egroff +
772 (u64 __iomem *)
773 ((char __iomem *)
774 dd->ipath_kregbase +
775 dd->ipath_rcvegrbase), 0, pa);
776 pa += egrsize;
777 }
778 cond_resched(); /* don't hog the cpu */
779 }
780
781 ret = 0;
782 goto bail;
783
784bail_rcvegrbuf_phys:
785 for (e = 0; e < pd->port_rcvegrbuf_chunks &&
786 pd->port_rcvegrbuf[e]; e++)
787 dma_free_coherent(&dd->pcidev->dev, size,
788 pd->port_rcvegrbuf[e],
789 pd->port_rcvegrbuf_phys[e]);
790
791 vfree(pd->port_rcvegrbuf_phys);
792 pd->port_rcvegrbuf_phys = NULL;
793bail_rcvegrbuf:
794 vfree(pd->port_rcvegrbuf);
795 pd->port_rcvegrbuf = NULL;
796bail:
797 return ret;
798}
799
800static int ipath_do_user_init(struct ipath_portdata *pd,
801 const struct ipath_user_info *uinfo)
802{
803 int ret = 0;
804 struct ipath_devdata *dd = pd->port_dd;
805 u64 physaddr, uaddr, off, atmp;
806 struct page *pagep;
807 u32 head32;
808 u64 head;
809
810 /* for now, if major version is different, bail */
811 if ((uinfo->spu_userversion >> 16) != IPATH_USER_SWMAJOR) {
812 dev_info(&dd->pcidev->dev,
813 "User major version %d not same as driver "
814 "major %d\n", uinfo->spu_userversion >> 16,
815 IPATH_USER_SWMAJOR);
816 ret = -ENODEV;
817 goto done;
818 }
819
820 if ((uinfo->spu_userversion & 0xffff) != IPATH_USER_SWMINOR)
821 ipath_dbg("User minor version %d not same as driver "
822 "minor %d\n", uinfo->spu_userversion & 0xffff,
823 IPATH_USER_SWMINOR);
824
825 if (uinfo->spu_rcvhdrsize) {
826 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
827 if (ret)
828 goto done;
829 }
830
831 /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
832
833 /* set up for the rcvhdr Q tail register writeback to user memory */
834 if (!uinfo->spu_rcvhdraddr ||
835 !access_ok(VERIFY_WRITE, (u64 __user *) (unsigned long)
836 uinfo->spu_rcvhdraddr, sizeof(u64))) {
837 ipath_dbg("Port %d rcvhdrtail addr %llx not valid\n",
838 pd->port_port,
839 (unsigned long long) uinfo->spu_rcvhdraddr);
840 ret = -EINVAL;
841 goto done;
842 }
843
844 off = offset_in_page(uinfo->spu_rcvhdraddr);
845 uaddr = PAGE_MASK & (unsigned long) uinfo->spu_rcvhdraddr;
846 ret = ipath_get_user_pages_nocopy(uaddr, &pagep);
847 if (ret) {
848 dev_info(&dd->pcidev->dev, "Failed to lookup and lock "
849 "address %llx for rcvhdrtail: errno %d\n",
850 (unsigned long long) uinfo->spu_rcvhdraddr, -ret);
851 goto done;
852 }
853 ipath_stats.sps_pagelocks++;
854 pd->port_rcvhdrtail_uaddr = uaddr;
855 pd->port_rcvhdrtail_pagep = pagep;
856 pd->port_rcvhdrtail_kvaddr =
857 page_address(pagep);
858 pd->port_rcvhdrtail_kvaddr += off;
859 physaddr = page_to_phys(pagep) + off;
860 ipath_cdbg(VERBOSE, "port %d user addr %llx hdrtailaddr, %llx "
861 "physical (off=%llx)\n",
862 pd->port_port,
863 (unsigned long long) uinfo->spu_rcvhdraddr,
864 (unsigned long long) physaddr, (unsigned long long) off);
865 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
866 pd->port_port, physaddr);
867 atmp = ipath_read_kreg64_port(dd,
868 dd->ipath_kregs->kr_rcvhdrtailaddr,
869 pd->port_port);
870 if (physaddr != atmp) {
871 ipath_dev_err(dd,
872 "Catastrophic software error, "
873 "RcvHdrTailAddr%u written as %llx, "
874 "read back as %llx\n", pd->port_port,
875 (unsigned long long) physaddr,
876 (unsigned long long) atmp);
877 ret = -EINVAL;
878 goto done;
879 }
880
881 /* for right now, kernel piobufs are at end, so port 1 is at 0 */
882 pd->port_piobufs = dd->ipath_piobufbase +
883 dd->ipath_pbufsport * (pd->port_port -
884 1) * dd->ipath_palign;
885 ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n",
886 pd->port_port, pd->port_piobufs);
887
888 /*
889 * Now allocate the rcvhdr Q and eager TIDs; skip the TID
890 * array for time being. If pd->port_port > chip-supported,
891 * we need to do extra stuff here to handle by handling overflow
892 * through port 0, someday
893 */
894 ret = ipath_create_rcvhdrq(dd, pd);
895 if (!ret)
896 ret = ipath_create_user_egr(pd);
897 if (ret)
898 goto done;
899 /* enable receives now */
900 /* atomically set enable bit for this port */
901 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port,
902 &dd->ipath_rcvctrl);
903
904 /*
905 * set the head registers for this port to the current values
906 * of the tail pointers, since we don't know if they were
907 * updated on last use of the port.
908 */
909 head32 = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
910 head = (u64) head32;
911 ipath_write_ureg(dd, ur_rcvhdrhead, head, pd->port_port);
912 head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
913 ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
914 dd->ipath_lastegrheads[pd->port_port] = -1;
915 dd->ipath_lastrcvhdrqtails[pd->port_port] = -1;
916 ipath_cdbg(VERBOSE, "Wrote port%d head %llx, egrhead %x from "
917 "tail regs\n", pd->port_port,
918 (unsigned long long) head, head32);
919 pd->port_tidcursor = 0; /* start at beginning after open */
920 /*
921 * now enable the port; the tail registers will be written to memory
922 * by the chip as soon as it sees the write to
923 * dd->ipath_kregs->kr_rcvctrl. The update only happens on
924 * transition from 0 to 1, so clear it first, then set it as part of
925 * enabling the port. This will (very briefly) affect any other
926 * open ports, but it shouldn't be long enough to be an issue.
927 */
928 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
929 dd->ipath_rcvctrl & ~INFINIPATH_R_TAILUPD);
930 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
931 dd->ipath_rcvctrl);
932
933done:
934 return ret;
935}
936
937static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
938 u64 ureg)
939{
940 unsigned long phys;
941 int ret;
942
943 /* it's the real hardware, so io_remap works */
944
945 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
946 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
947 "%lx > PAGE\n", vma->vm_end - vma->vm_start);
948 ret = -EFAULT;
949 } else {
950 phys = dd->ipath_physaddr + ureg;
951 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
952
953 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
954 ret = io_remap_pfn_range(vma, vma->vm_start,
955 phys >> PAGE_SHIFT,
956 vma->vm_end - vma->vm_start,
957 vma->vm_page_prot);
958 }
959 return ret;
960}
961
962static int mmap_piobufs(struct vm_area_struct *vma,
963 struct ipath_devdata *dd,
964 struct ipath_portdata *pd)
965{
966 unsigned long phys;
967 int ret;
968
969 /*
970 * When we map the PIO buffers, we want to map them as writeonly, no
971 * read possible.
972 */
973
974 if ((vma->vm_end - vma->vm_start) >
975 (dd->ipath_pbufsport * dd->ipath_palign)) {
976 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
977 "reqlen %lx > PAGE\n",
978 vma->vm_end - vma->vm_start);
979 ret = -EFAULT;
980 goto bail;
981 }
982
983 phys = dd->ipath_physaddr + pd->port_piobufs;
984 /*
985 * Do *NOT* mark this as non-cached (PWT bit), or we don't get the
986 * write combining behavior we want on the PIO buffers!
987 * vma->vm_page_prot =
988 * pgprot_noncached(vma->vm_page_prot);
989 */
990
991 if (vma->vm_flags & VM_READ) {
992 dev_info(&dd->pcidev->dev,
993 "Can't map piobufs as readable (flags=%lx)\n",
994 vma->vm_flags);
995 ret = -EPERM;
996 goto bail;
997 }
998
999 /* don't allow them to later change to readable with mprotect */
1000
1001 vma->vm_flags &= ~VM_MAYWRITE;
1002 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1003
1004 ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1005 vma->vm_end - vma->vm_start,
1006 vma->vm_page_prot);
1007bail:
1008 return ret;
1009}
1010
1011static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1012 struct ipath_portdata *pd)
1013{
1014 struct ipath_devdata *dd = pd->port_dd;
1015 unsigned long start, size;
1016 size_t total_size, i;
1017 dma_addr_t *phys;
1018 int ret;
1019
1020 if (!pd->port_rcvegrbuf) {
1021 ret = -EFAULT;
1022 goto bail;
1023 }
1024
1025 size = pd->port_rcvegrbuf_size;
1026 total_size = pd->port_rcvegrbuf_chunks * size;
1027 if ((vma->vm_end - vma->vm_start) > total_size) {
1028 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1029 "reqlen %lx > actual %lx\n",
1030 vma->vm_end - vma->vm_start,
1031 (unsigned long) total_size);
1032 ret = -EFAULT;
1033 goto bail;
1034 }
1035
1036 if (vma->vm_flags & VM_WRITE) {
1037 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1038 "writable (flags=%lx)\n", vma->vm_flags);
1039 ret = -EPERM;
1040 goto bail;
1041 }
1042
1043 start = vma->vm_start;
1044 phys = pd->port_rcvegrbuf_phys;
1045
1046 /* don't allow them to later change to writeable with mprotect */
1047 vma->vm_flags &= ~VM_MAYWRITE;
1048
1049 for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1050 ret = remap_pfn_range(vma, start, phys[i] >> PAGE_SHIFT,
1051 size, vma->vm_page_prot);
1052 if (ret < 0)
1053 goto bail;
1054 }
1055 ret = 0;
1056
1057bail:
1058 return ret;
1059}
1060
1061static int mmap_rcvhdrq(struct vm_area_struct *vma,
1062 struct ipath_portdata *pd)
1063{
1064 struct ipath_devdata *dd = pd->port_dd;
1065 size_t total_size;
1066 int ret;
1067
1068 /*
1069 * kmalloc'ed memory, physically contiguous; this is from
1070 * spi_rcvhdr_base; we allow user to map read-write so they can
1071 * write hdrq entries to allow protocol code to directly poll
1072 * whether a hdrq entry has been written.
1073 */
1074 total_size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1075 sizeof(u32), PAGE_SIZE);
1076 if ((vma->vm_end - vma->vm_start) > total_size) {
1077 dev_info(&dd->pcidev->dev,
1078 "FAIL on rcvhdrq: reqlen %lx > actual %lx\n",
1079 vma->vm_end - vma->vm_start,
1080 (unsigned long) total_size);
1081 ret = -EFAULT;
1082 goto bail;
1083 }
1084
1085 ret = remap_pfn_range(vma, vma->vm_start,
1086 pd->port_rcvhdrq_phys >> PAGE_SHIFT,
1087 vma->vm_end - vma->vm_start,
1088 vma->vm_page_prot);
1089bail:
1090 return ret;
1091}
1092
1093static int mmap_pioavailregs(struct vm_area_struct *vma,
1094 struct ipath_portdata *pd)
1095{
1096 struct ipath_devdata *dd = pd->port_dd;
1097 int ret;
1098
1099 /*
1100 * when we map the PIO bufferavail registers, we want to map them as
1101 * readonly, no write possible.
1102 *
1103 * kmalloc'ed memory, physically contiguous, one page only, readonly
1104 */
1105
1106 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1107 dev_info(&dd->pcidev->dev, "FAIL on pioavailregs_dma: "
1108 "reqlen %lx > actual %lx\n",
1109 vma->vm_end - vma->vm_start,
1110 (unsigned long) PAGE_SIZE);
1111 ret = -EFAULT;
1112 goto bail;
1113 }
1114
1115 if (vma->vm_flags & VM_WRITE) {
1116 dev_info(&dd->pcidev->dev,
1117 "Can't map pioavailregs as writable (flags=%lx)\n",
1118 vma->vm_flags);
1119 ret = -EPERM;
1120 goto bail;
1121 }
1122
1123 /* don't allow them to later change with mprotect */
1124 vma->vm_flags &= ~VM_MAYWRITE;
1125
1126 ret = remap_pfn_range(vma, vma->vm_start,
1127 dd->ipath_pioavailregs_phys >> PAGE_SHIFT,
1128 PAGE_SIZE, vma->vm_page_prot);
1129bail:
1130 return ret;
1131}
1132
1133/**
1134 * ipath_mmap - mmap various structures into user space
1135 * @fp: the file pointer
1136 * @vma: the VM area
1137 *
1138 * We use this to have a shared buffer between the kernel and the user code
1139 * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1140 * buffers in the chip. We have the open and close entries so we can bump
1141 * the ref count and keep the driver from being unloaded while still mapped.
1142 */
1143static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1144{
1145 struct ipath_portdata *pd;
1146 struct ipath_devdata *dd;
1147 u64 pgaddr, ureg;
1148 int ret;
1149
1150 pd = port_fp(fp);
1151 dd = pd->port_dd;
1152 /*
1153 * This is the ipath_do_user_init() code, mapping the shared buffers
1154 * into the user process. The address referred to by vm_pgoff is the
1155 * virtual, not physical, address; we only do one mmap for each
1156 * space mapped.
1157 */
1158 pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1159
1160 /*
1161 * note that ureg does *NOT* have the kregvirt as part of it, to be
1162 * sure that for 32 bit programs, we don't end up trying to map a >
1163 * 44 address. Has to match ipath_get_base_info() code that sets
1164 * __spi_uregbase
1165 */
1166
1167 ureg = dd->ipath_uregbase + dd->ipath_palign * pd->port_port;
1168
1169 ipath_cdbg(MM, "ushare: pgaddr %llx vm_start=%lx, vmlen %lx\n",
1170 (unsigned long long) pgaddr, vma->vm_start,
1171 vma->vm_end - vma->vm_start);
1172
1173 if (pgaddr == ureg)
1174 ret = mmap_ureg(vma, dd, ureg);
1175 else if (pgaddr == pd->port_piobufs)
1176 ret = mmap_piobufs(vma, dd, pd);
1177 else if (pgaddr == (u64) pd->port_rcvegr_phys)
1178 ret = mmap_rcvegrbufs(vma, pd);
1179 else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1180 ret = mmap_rcvhdrq(vma, pd);
1181 else if (pgaddr == dd->ipath_pioavailregs_phys)
1182 ret = mmap_pioavailregs(vma, pd);
1183 else
1184 ret = -EINVAL;
1185
1186 vma->vm_private_data = NULL;
1187
1188 if (ret < 0)
1189 dev_info(&dd->pcidev->dev,
1190 "Failure %d on addr %lx, off %lx\n",
1191 -ret, vma->vm_start, vma->vm_pgoff);
1192
1193 return ret;
1194}
1195
1196static unsigned int ipath_poll(struct file *fp,
1197 struct poll_table_struct *pt)
1198{
1199 struct ipath_portdata *pd;
1200 u32 head, tail;
1201 int bit;
1202 struct ipath_devdata *dd;
1203
1204 pd = port_fp(fp);
1205 dd = pd->port_dd;
1206
1207 bit = pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT;
1208 set_bit(bit, &dd->ipath_rcvctrl);
1209
1210 /*
1211 * Before blocking, make sure that head is still == tail,
1212 * reading from the chip, so we can be sure the interrupt
1213 * enable has made it to the chip. If not equal, disable
1214 * interrupt again and return immediately. This avoids races,
1215 * and the overhead of the chip read doesn't matter much at
1216 * this point, since we are waiting for something anyway.
1217 */
1218
1219 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1220 dd->ipath_rcvctrl);
1221
1222 head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1223 tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1224
1225 if (tail == head) {
1226 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1227 poll_wait(fp, &pd->port_wait, pt);
1228
1229 if (test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) {
1230 /* timed out, no packets received */
1231 clear_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1232 pd->port_rcvwait_to++;
1233 }
1234 }
1235 else {
1236 /* it's already happened; don't do wait_event overhead */
1237 pd->port_rcvnowait++;
1238 }
1239
1240 clear_bit(bit, &dd->ipath_rcvctrl);
1241 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1242 dd->ipath_rcvctrl);
1243
1244 return 0;
1245}
1246
1247static int try_alloc_port(struct ipath_devdata *dd, int port,
1248 struct file *fp)
1249{
1250 int ret;
1251
1252 if (!dd->ipath_pd[port]) {
1253 void *p, *ptmp;
1254
1255 p = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1256
1257 /*
1258 * Allocate memory for use in ipath_tid_update() just once
1259 * at open, not per call. Reduces cost of expected send
1260 * setup.
1261 */
1262 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1263 dd->ipath_rcvtidcnt * sizeof(struct page **),
1264 GFP_KERNEL);
1265 if (!p || !ptmp) {
1266 ipath_dev_err(dd, "Unable to allocate portdata "
1267 "memory, failing open\n");
1268 ret = -ENOMEM;
1269 kfree(p);
1270 kfree(ptmp);
1271 goto bail;
1272 }
1273 dd->ipath_pd[port] = p;
1274 dd->ipath_pd[port]->port_port = port;
1275 dd->ipath_pd[port]->port_dd = dd;
1276 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1277 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1278 }
1279 if (!dd->ipath_pd[port]->port_cnt) {
1280 dd->ipath_pd[port]->port_cnt = 1;
1281 fp->private_data = (void *) dd->ipath_pd[port];
1282 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1283 current->comm, current->pid, dd->ipath_unit,
1284 port);
1285 dd->ipath_pd[port]->port_pid = current->pid;
1286 strncpy(dd->ipath_pd[port]->port_comm, current->comm,
1287 sizeof(dd->ipath_pd[port]->port_comm));
1288 ipath_stats.sps_ports++;
1289 ret = 0;
1290 goto bail;
1291 }
1292 ret = -EBUSY;
1293
1294bail:
1295 return ret;
1296}
1297
1298static inline int usable(struct ipath_devdata *dd)
1299{
1300 return dd &&
1301 (dd->ipath_flags & IPATH_PRESENT) &&
1302 dd->ipath_kregbase &&
1303 dd->ipath_lid &&
1304 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1305 | IPATH_LINKUNK));
1306}
1307
1308static int find_free_port(int unit, struct file *fp)
1309{
1310 struct ipath_devdata *dd = ipath_lookup(unit);
1311 int ret, i;
1312
1313 if (!dd) {
1314 ret = -ENODEV;
1315 goto bail;
1316 }
1317
1318 if (!usable(dd)) {
1319 ret = -ENETDOWN;
1320 goto bail;
1321 }
1322
1323 for (i = 0; i < dd->ipath_cfgports; i++) {
1324 ret = try_alloc_port(dd, i, fp);
1325 if (ret != -EBUSY)
1326 goto bail;
1327 }
1328 ret = -EBUSY;
1329
1330bail:
1331 return ret;
1332}
1333
1334static int find_best_unit(struct file *fp)
1335{
1336 int ret = 0, i, prefunit = -1, devmax;
1337 int maxofallports, npresent, nup;
1338 int ndev;
1339
1340 (void) ipath_count_units(&npresent, &nup, &maxofallports);
1341
1342 /*
1343 * This code is present to allow a knowledgeable person to
1344 * specify the layout of processes to processors before opening
1345 * this driver, and then we'll assign the process to the "closest"
1346 * HT-400 to that processor (we assume reasonable connectivity,
1347 * for now). This code assumes that if affinity has been set
1348 * before this point, that at most one cpu is set; for now this
1349 * is reasonable. I check for both cpus_empty() and cpus_full(),
1350 * in case some kernel variant sets none of the bits when no
1351 * affinity is set. 2.6.11 and 12 kernels have all present
1352 * cpus set. Some day we'll have to fix it up further to handle
1353 * a cpu subset. This algorithm fails for two HT-400's connected
1354 * in tunnel fashion. Eventually this needs real topology
1355 * information. There may be some issues with dual core numbering
1356 * as well. This needs more work prior to release.
1357 */
1358 if (!cpus_empty(current->cpus_allowed) &&
1359 !cpus_full(current->cpus_allowed)) {
1360 int ncpus = num_online_cpus(), curcpu = -1;
1361 for (i = 0; i < ncpus; i++)
1362 if (cpu_isset(i, current->cpus_allowed)) {
1363 ipath_cdbg(PROC, "%s[%u] affinity set for "
1364 "cpu %d\n", current->comm,
1365 current->pid, i);
1366 curcpu = i;
1367 }
1368 if (curcpu != -1) {
1369 if (npresent) {
1370 prefunit = curcpu / (ncpus / npresent);
1371 ipath_dbg("%s[%u] %d chips, %d cpus, "
1372 "%d cpus/chip, select unit %d\n",
1373 current->comm, current->pid,
1374 npresent, ncpus, ncpus / npresent,
1375 prefunit);
1376 }
1377 }
1378 }
1379
1380 /*
1381 * user ports start at 1, kernel port is 0
1382 * For now, we do round-robin access across all chips
1383 */
1384
1385 if (prefunit != -1)
1386 devmax = prefunit + 1;
1387 else
1388 devmax = ipath_count_units(NULL, NULL, NULL);
1389recheck:
1390 for (i = 1; i < maxofallports; i++) {
1391 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1392 ndev++) {
1393 struct ipath_devdata *dd = ipath_lookup(ndev);
1394
1395 if (!usable(dd))
1396 continue; /* can't use this unit */
1397 if (i >= dd->ipath_cfgports)
1398 /*
1399 * Maxed out on users of this unit. Try
1400 * next.
1401 */
1402 continue;
1403 ret = try_alloc_port(dd, i, fp);
1404 if (!ret)
1405 goto done;
1406 }
1407 }
1408
1409 if (npresent) {
1410 if (nup == 0) {
1411 ret = -ENETDOWN;
1412 ipath_dbg("No ports available (none initialized "
1413 "and ready)\n");
1414 } else {
1415 if (prefunit > 0) {
1416 /* if started above 0, retry from 0 */
1417 ipath_cdbg(PROC,
1418 "%s[%u] no ports on prefunit "
1419 "%d, clear and re-check\n",
1420 current->comm, current->pid,
1421 prefunit);
1422 devmax = ipath_count_units(NULL, NULL,
1423 NULL);
1424 prefunit = -1;
1425 goto recheck;
1426 }
1427 ret = -EBUSY;
1428 ipath_dbg("No ports available\n");
1429 }
1430 } else {
1431 ret = -ENXIO;
1432 ipath_dbg("No boards found\n");
1433 }
1434
1435done:
1436 return ret;
1437}
1438
1439static int ipath_open(struct inode *in, struct file *fp)
1440{
1441 int ret, minor;
1442
1443 mutex_lock(&ipath_mutex);
1444
1445 minor = iminor(in);
1446 ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1447 (long)in->i_rdev, minor);
1448
1449 if (minor)
1450 ret = find_free_port(minor - 1, fp);
1451 else
1452 ret = find_best_unit(fp);
1453
1454 mutex_unlock(&ipath_mutex);
1455 return ret;
1456}
1457
1458/**
1459 * unlock_exptid - unlock any expected TID entries port still had in use
1460 * @pd: port
1461 *
1462 * We don't actually update the chip here, because we do a bulk update
1463 * below, using ipath_f_clear_tids.
1464 */
1465static void unlock_expected_tids(struct ipath_portdata *pd)
1466{
1467 struct ipath_devdata *dd = pd->port_dd;
1468 int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
1469 int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
1470
1471 ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
1472 pd->port_port);
1473 for (i = port_tidbase; i < maxtid; i++) {
1474 if (!dd->ipath_pageshadow[i])
1475 continue;
1476
1477 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i],
1478 1);
1479 dd->ipath_pageshadow[i] = NULL;
1480 cnt++;
1481 ipath_stats.sps_pageunlocks++;
1482 }
1483 if (cnt)
1484 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
1485 pd->port_port, cnt);
1486
1487 if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
1488 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
1489 (unsigned long long) ipath_stats.sps_pagelocks,
1490 (unsigned long long)
1491 ipath_stats.sps_pageunlocks);
1492}
1493
1494static int ipath_close(struct inode *in, struct file *fp)
1495{
1496 int ret = 0;
1497 struct ipath_portdata *pd;
1498 struct ipath_devdata *dd;
1499 unsigned port;
1500
1501 ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
1502 (long)in->i_rdev, fp->private_data);
1503
1504 mutex_lock(&ipath_mutex);
1505
1506 pd = port_fp(fp);
1507 port = pd->port_port;
1508 fp->private_data = NULL;
1509 dd = pd->port_dd;
1510
1511 if (pd->port_hdrqfull) {
1512 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors "
1513 "during run\n", pd->port_comm, pd->port_pid,
1514 pd->port_hdrqfull);
1515 pd->port_hdrqfull = 0;
1516 }
1517
1518 if (pd->port_rcvwait_to || pd->port_piowait_to
1519 || pd->port_rcvnowait || pd->port_pionowait) {
1520 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
1521 "%u rcv %u, pio already\n",
1522 pd->port_port, pd->port_rcvwait_to,
1523 pd->port_piowait_to, pd->port_rcvnowait,
1524 pd->port_pionowait);
1525 pd->port_rcvwait_to = pd->port_piowait_to =
1526 pd->port_rcvnowait = pd->port_pionowait = 0;
1527 }
1528 if (pd->port_flag) {
1529 ipath_dbg("port %u port_flag still set to 0x%lx\n",
1530 pd->port_port, pd->port_flag);
1531 pd->port_flag = 0;
1532 }
1533
1534 if (dd->ipath_kregbase) {
1535 if (pd->port_rcvhdrtail_uaddr) {
1536 pd->port_rcvhdrtail_uaddr = 0;
1537 pd->port_rcvhdrtail_kvaddr = NULL;
1538 ipath_release_user_pages_on_close(
1539 &pd->port_rcvhdrtail_pagep, 1);
1540 pd->port_rcvhdrtail_pagep = NULL;
1541 ipath_stats.sps_pageunlocks++;
1542 }
1543 ipath_write_kreg_port(
1544 dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
1545 port, 0ULL);
1546 ipath_write_kreg_port(
1547 dd, dd->ipath_kregs->kr_rcvhdraddr,
1548 pd->port_port, 0);
1549
1550 /* clean up the pkeys for this port user */
1551 ipath_clean_part_key(pd, dd);
1552
1553 if (port < dd->ipath_cfgports) {
1554 int i = dd->ipath_pbufsport * (port - 1);
1555 ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport);
1556
1557 /* atomically clear receive enable port. */
1558 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port,
1559 &dd->ipath_rcvctrl);
1560 ipath_write_kreg(
1561 dd,
1562 dd->ipath_kregs->kr_rcvctrl,
1563 dd->ipath_rcvctrl);
1564
1565 if (dd->ipath_pageshadow)
1566 unlock_expected_tids(pd);
1567 ipath_stats.sps_ports--;
1568 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
1569 pd->port_comm, pd->port_pid,
1570 dd->ipath_unit, port);
1571 }
1572 }
1573
1574 pd->port_cnt = 0;
1575 pd->port_pid = 0;
1576
1577 dd->ipath_f_clear_tids(dd, pd->port_port);
1578
1579 ipath_free_pddata(dd, pd->port_port, 0);
1580
1581 mutex_unlock(&ipath_mutex);
1582
1583 return ret;
1584}
1585
1586static int ipath_port_info(struct ipath_portdata *pd,
1587 struct ipath_port_info __user *uinfo)
1588{
1589 struct ipath_port_info info;
1590 int nup;
1591 int ret;
1592
1593 (void) ipath_count_units(NULL, &nup, NULL);
1594 info.num_active = nup;
1595 info.unit = pd->port_dd->ipath_unit;
1596 info.port = pd->port_port;
1597
1598 if (copy_to_user(uinfo, &info, sizeof(info))) {
1599 ret = -EFAULT;
1600 goto bail;
1601 }
1602 ret = 0;
1603
1604bail:
1605 return ret;
1606}
1607
1608static ssize_t ipath_write(struct file *fp, const char __user *data,
1609 size_t count, loff_t *off)
1610{
1611 const struct ipath_cmd __user *ucmd;
1612 struct ipath_portdata *pd;
1613 const void __user *src;
1614 size_t consumed, copy;
1615 struct ipath_cmd cmd;
1616 ssize_t ret = 0;
1617 void *dest;
1618
1619 if (count < sizeof(cmd.type)) {
1620 ret = -EINVAL;
1621 goto bail;
1622 }
1623
1624 ucmd = (const struct ipath_cmd __user *) data;
1625
1626 if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1627 ret = -EFAULT;
1628 goto bail;
1629 }
1630
1631 consumed = sizeof(cmd.type);
1632
1633 switch (cmd.type) {
1634 case IPATH_CMD_USER_INIT:
1635 copy = sizeof(cmd.cmd.user_info);
1636 dest = &cmd.cmd.user_info;
1637 src = &ucmd->cmd.user_info;
1638 break;
1639 case IPATH_CMD_RECV_CTRL:
1640 copy = sizeof(cmd.cmd.recv_ctrl);
1641 dest = &cmd.cmd.recv_ctrl;
1642 src = &ucmd->cmd.recv_ctrl;
1643 break;
1644 case IPATH_CMD_PORT_INFO:
1645 copy = sizeof(cmd.cmd.port_info);
1646 dest = &cmd.cmd.port_info;
1647 src = &ucmd->cmd.port_info;
1648 break;
1649 case IPATH_CMD_TID_UPDATE:
1650 case IPATH_CMD_TID_FREE:
1651 copy = sizeof(cmd.cmd.tid_info);
1652 dest = &cmd.cmd.tid_info;
1653 src = &ucmd->cmd.tid_info;
1654 break;
1655 case IPATH_CMD_SET_PART_KEY:
1656 copy = sizeof(cmd.cmd.part_key);
1657 dest = &cmd.cmd.part_key;
1658 src = &ucmd->cmd.part_key;
1659 break;
1660 default:
1661 ret = -EINVAL;
1662 goto bail;
1663 }
1664
1665 if ((count - consumed) < copy) {
1666 ret = -EINVAL;
1667 goto bail;
1668 }
1669
1670 if (copy_from_user(dest, src, copy)) {
1671 ret = -EFAULT;
1672 goto bail;
1673 }
1674
1675 consumed += copy;
1676 pd = port_fp(fp);
1677
1678 switch (cmd.type) {
1679 case IPATH_CMD_USER_INIT:
1680 ret = ipath_do_user_init(pd, &cmd.cmd.user_info);
1681 if (ret < 0)
1682 goto bail;
1683 ret = ipath_get_base_info(
1684 pd, (void __user *) (unsigned long)
1685 cmd.cmd.user_info.spu_base_info,
1686 cmd.cmd.user_info.spu_base_info_size);
1687 break;
1688 case IPATH_CMD_RECV_CTRL:
1689 ret = ipath_manage_rcvq(pd, cmd.cmd.recv_ctrl);
1690 break;
1691 case IPATH_CMD_PORT_INFO:
1692 ret = ipath_port_info(pd,
1693 (struct ipath_port_info __user *)
1694 (unsigned long) cmd.cmd.port_info);
1695 break;
1696 case IPATH_CMD_TID_UPDATE:
1697 ret = ipath_tid_update(pd, &cmd.cmd.tid_info);
1698 break;
1699 case IPATH_CMD_TID_FREE:
1700 ret = ipath_tid_free(pd, &cmd.cmd.tid_info);
1701 break;
1702 case IPATH_CMD_SET_PART_KEY:
1703 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
1704 break;
1705 }
1706
1707 if (ret >= 0)
1708 ret = consumed;
1709
1710bail:
1711 return ret;
1712}
1713
1714static struct class *ipath_class;
1715
1716static int init_cdev(int minor, char *name, struct file_operations *fops,
1717 struct cdev **cdevp, struct class_device **class_devp)
1718{
1719 const dev_t dev = MKDEV(IPATH_MAJOR, minor);
1720 struct cdev *cdev = NULL;
1721 struct class_device *class_dev = NULL;
1722 int ret;
1723
1724 cdev = cdev_alloc();
1725 if (!cdev) {
1726 printk(KERN_ERR IPATH_DRV_NAME
1727 ": Could not allocate cdev for minor %d, %s\n",
1728 minor, name);
1729 ret = -ENOMEM;
1730 goto done;
1731 }
1732
1733 cdev->owner = THIS_MODULE;
1734 cdev->ops = fops;
1735 kobject_set_name(&cdev->kobj, name);
1736
1737 ret = cdev_add(cdev, dev, 1);
1738 if (ret < 0) {
1739 printk(KERN_ERR IPATH_DRV_NAME
1740 ": Could not add cdev for minor %d, %s (err %d)\n",
1741 minor, name, -ret);
1742 goto err_cdev;
1743 }
1744
1745 class_dev = class_device_create(ipath_class, NULL, dev, NULL, name);
1746
1747 if (IS_ERR(class_dev)) {
1748 ret = PTR_ERR(class_dev);
1749 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1750 "class_dev for minor %d, %s (err %d)\n",
1751 minor, name, -ret);
1752 goto err_cdev;
1753 }
1754
1755 goto done;
1756
1757err_cdev:
1758 cdev_del(cdev);
1759 cdev = NULL;
1760
1761done:
1762 if (ret >= 0) {
1763 *cdevp = cdev;
1764 *class_devp = class_dev;
1765 } else {
1766 *cdevp = NULL;
1767 *class_devp = NULL;
1768 }
1769
1770 return ret;
1771}
1772
1773int ipath_cdev_init(int minor, char *name, struct file_operations *fops,
1774 struct cdev **cdevp, struct class_device **class_devp)
1775{
1776 return init_cdev(minor, name, fops, cdevp, class_devp);
1777}
1778
1779static void cleanup_cdev(struct cdev **cdevp,
1780 struct class_device **class_devp)
1781{
1782 struct class_device *class_dev = *class_devp;
1783
1784 if (class_dev) {
1785 class_device_unregister(class_dev);
1786 *class_devp = NULL;
1787 }
1788
1789 if (*cdevp) {
1790 cdev_del(*cdevp);
1791 *cdevp = NULL;
1792 }
1793}
1794
1795void ipath_cdev_cleanup(struct cdev **cdevp,
1796 struct class_device **class_devp)
1797{
1798 cleanup_cdev(cdevp, class_devp);
1799}
1800
1801static struct cdev *wildcard_cdev;
1802static struct class_device *wildcard_class_dev;
1803
1804static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
1805
1806static int user_init(void)
1807{
1808 int ret;
1809
1810 ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
1811 if (ret < 0) {
1812 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
1813 "chrdev region (err %d)\n", -ret);
1814 goto done;
1815 }
1816
1817 ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
1818
1819 if (IS_ERR(ipath_class)) {
1820 ret = PTR_ERR(ipath_class);
1821 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
1822 "device class (err %d)\n", -ret);
1823 goto bail;
1824 }
1825
1826 goto done;
1827bail:
1828 unregister_chrdev_region(dev, IPATH_NMINORS);
1829done:
1830 return ret;
1831}
1832
1833static void user_cleanup(void)
1834{
1835 if (ipath_class) {
1836 class_destroy(ipath_class);
1837 ipath_class = NULL;
1838 }
1839
1840 unregister_chrdev_region(dev, IPATH_NMINORS);
1841}
1842
1843static atomic_t user_count = ATOMIC_INIT(0);
1844static atomic_t user_setup = ATOMIC_INIT(0);
1845
1846int ipath_user_add(struct ipath_devdata *dd)
1847{
1848 char name[10];
1849 int ret;
1850
1851 if (atomic_inc_return(&user_count) == 1) {
1852 ret = user_init();
1853 if (ret < 0) {
1854 ipath_dev_err(dd, "Unable to set up user support: "
1855 "error %d\n", -ret);
1856 goto bail;
1857 }
1858 ret = ipath_diag_init();
1859 if (ret < 0) {
1860 ipath_dev_err(dd, "Unable to set up diag support: "
1861 "error %d\n", -ret);
1862 goto bail_sma;
1863 }
1864
1865 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
1866 &wildcard_class_dev);
1867 if (ret < 0) {
1868 ipath_dev_err(dd, "Could not create wildcard "
1869 "minor: error %d\n", -ret);
1870 goto bail_diag;
1871 }
1872
1873 atomic_set(&user_setup, 1);
1874 }
1875
1876 snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
1877
1878 ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
1879 &dd->cdev, &dd->class_dev);
1880 if (ret < 0)
1881 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
1882 dd->ipath_unit + 1, name);
1883
1884 goto bail;
1885
1886bail_diag:
1887 ipath_diag_cleanup();
1888bail_sma:
1889 user_cleanup();
1890bail:
1891 return ret;
1892}
1893
1894void ipath_user_del(struct ipath_devdata *dd)
1895{
1896 cleanup_cdev(&dd->cdev, &dd->class_dev);
1897
1898 if (atomic_dec_return(&user_count) == 0) {
1899 if (atomic_read(&user_setup) == 0)
1900 goto bail;
1901
1902 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
1903 ipath_diag_cleanup();
1904 user_cleanup();
1905
1906 atomic_set(&user_setup, 0);
1907 }
1908bail:
1909 return;
1910}
diff --git a/drivers/infiniband/hw/ipath/ipath_user_pages.c b/drivers/infiniband/hw/ipath/ipath_user_pages.c
new file mode 100644
index 000000000000..2bb08afc86d0
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_user_pages.c
@@ -0,0 +1,207 @@
1/*
2 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/mm.h>
34#include <linux/device.h>
35
36#include "ipath_kernel.h"
37
38static void __ipath_release_user_pages(struct page **p, size_t num_pages,
39 int dirty)
40{
41 size_t i;
42
43 for (i = 0; i < num_pages; i++) {
44 ipath_cdbg(MM, "%lu/%lu put_page %p\n", (unsigned long) i,
45 (unsigned long) num_pages, p[i]);
46 if (dirty)
47 set_page_dirty_lock(p[i]);
48 put_page(p[i]);
49 }
50}
51
52/* call with current->mm->mmap_sem held */
53static int __get_user_pages(unsigned long start_page, size_t num_pages,
54 struct page **p, struct vm_area_struct **vma)
55{
56 unsigned long lock_limit;
57 size_t got;
58 int ret;
59
60#if 0
61 /*
62 * XXX - causes MPI programs to fail, haven't had time to check
63 * yet
64 */
65 if (!capable(CAP_IPC_LOCK)) {
66 ret = -EPERM;
67 goto bail;
68 }
69#endif
70
71 lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >>
72 PAGE_SHIFT;
73
74 if (num_pages > lock_limit) {
75 ret = -ENOMEM;
76 goto bail;
77 }
78
79 ipath_cdbg(VERBOSE, "pin %lx pages from vaddr %lx\n",
80 (unsigned long) num_pages, start_page);
81
82 for (got = 0; got < num_pages; got += ret) {
83 ret = get_user_pages(current, current->mm,
84 start_page + got * PAGE_SIZE,
85 num_pages - got, 1, 1,
86 p + got, vma);
87 if (ret < 0)
88 goto bail_release;
89 }
90
91 current->mm->locked_vm += num_pages;
92
93 ret = 0;
94 goto bail;
95
96bail_release:
97 __ipath_release_user_pages(p, got, 0);
98bail:
99 return ret;
100}
101
102/**
103 * ipath_get_user_pages - lock user pages into memory
104 * @start_page: the start page
105 * @num_pages: the number of pages
106 * @p: the output page structures
107 *
108 * This function takes a given start page (page aligned user virtual
109 * address) and pins it and the following specified number of pages. For
110 * now, num_pages is always 1, but that will probably change at some point
111 * (because caller is doing expected sends on a single virtually contiguous
112 * buffer, so we can do all pages at once).
113 */
114int ipath_get_user_pages(unsigned long start_page, size_t num_pages,
115 struct page **p)
116{
117 int ret;
118
119 down_write(&current->mm->mmap_sem);
120
121 ret = __get_user_pages(start_page, num_pages, p, NULL);
122
123 up_write(&current->mm->mmap_sem);
124
125 return ret;
126}
127
128/**
129 * ipath_get_user_pages_nocopy - lock a single page for I/O and mark shared
130 * @start_page: the page to lock
131 * @p: the output page structure
132 *
133 * This is similar to ipath_get_user_pages, but it's always one page, and we
134 * mark the page as locked for I/O, and shared. This is used for the user
135 * process page that contains the destination address for the rcvhdrq tail
136 * update, so we need to have the vma. If we don't do this, the page can be
137 * taken away from us on fork, even if the child never touches it, and then
138 * the user process never sees the tail register updates.
139 */
140int ipath_get_user_pages_nocopy(unsigned long page, struct page **p)
141{
142 struct vm_area_struct *vma;
143 int ret;
144
145 down_write(&current->mm->mmap_sem);
146
147 ret = __get_user_pages(page, 1, p, &vma);
148
149 up_write(&current->mm->mmap_sem);
150
151 return ret;
152}
153
154void ipath_release_user_pages(struct page **p, size_t num_pages)
155{
156 down_write(&current->mm->mmap_sem);
157
158 __ipath_release_user_pages(p, num_pages, 1);
159
160 current->mm->locked_vm -= num_pages;
161
162 up_write(&current->mm->mmap_sem);
163}
164
165struct ipath_user_pages_work {
166 struct work_struct work;
167 struct mm_struct *mm;
168 unsigned long num_pages;
169};
170
171static void user_pages_account(void *ptr)
172{
173 struct ipath_user_pages_work *work = ptr;
174
175 down_write(&work->mm->mmap_sem);
176 work->mm->locked_vm -= work->num_pages;
177 up_write(&work->mm->mmap_sem);
178 mmput(work->mm);
179 kfree(work);
180}
181
182void ipath_release_user_pages_on_close(struct page **p, size_t num_pages)
183{
184 struct ipath_user_pages_work *work;
185 struct mm_struct *mm;
186
187 __ipath_release_user_pages(p, num_pages, 1);
188
189 mm = get_task_mm(current);
190 if (!mm)
191 goto bail;
192
193 work = kmalloc(sizeof(*work), GFP_KERNEL);
194 if (!work)
195 goto bail_mm;
196
197 goto bail;
198
199 INIT_WORK(&work->work, user_pages_account, work);
200 work->mm = mm;
201 work->num_pages = num_pages;
202
203bail_mm:
204 mmput(mm);
205bail:
206 return;
207}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 19:50:27 -0500