Loading...
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/export.h>
39#include <linux/vmalloc.h>
40#include <linux/slab.h>
41#include <linux/highmem.h>
42#include <linux/io.h>
43#include <linux/jiffies.h>
44#include <linux/cpu.h>
45#include <asm/pgtable.h>
46
47#include "ipath_kernel.h"
48#include "ipath_common.h"
49#include "ipath_user_sdma.h"
50
51static int ipath_open(struct inode *, struct file *);
52static int ipath_close(struct inode *, struct file *);
53static ssize_t ipath_write(struct file *, const char __user *, size_t,
54 loff_t *);
55static ssize_t ipath_writev(struct kiocb *, const struct iovec *,
56 unsigned long , loff_t);
57static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
58static int ipath_mmap(struct file *, struct vm_area_struct *);
59
60static const struct file_operations ipath_file_ops = {
61 .owner = THIS_MODULE,
62 .write = ipath_write,
63 .aio_write = ipath_writev,
64 .open = ipath_open,
65 .release = ipath_close,
66 .poll = ipath_poll,
67 .mmap = ipath_mmap,
68 .llseek = noop_llseek,
69};
70
71/*
72 * Convert kernel virtual addresses to physical addresses so they don't
73 * potentially conflict with the chip addresses used as mmap offsets.
74 * It doesn't really matter what mmap offset we use as long as we can
75 * interpret it correctly.
76 */
77static u64 cvt_kvaddr(void *p)
78{
79 struct page *page;
80 u64 paddr = 0;
81
82 page = vmalloc_to_page(p);
83 if (page)
84 paddr = page_to_pfn(page) << PAGE_SHIFT;
85
86 return paddr;
87}
88
89static int ipath_get_base_info(struct file *fp,
90 void __user *ubase, size_t ubase_size)
91{
92 struct ipath_portdata *pd = port_fp(fp);
93 int ret = 0;
94 struct ipath_base_info *kinfo = NULL;
95 struct ipath_devdata *dd = pd->port_dd;
96 unsigned subport_cnt;
97 int shared, master;
98 size_t sz;
99
100 subport_cnt = pd->port_subport_cnt;
101 if (!subport_cnt) {
102 shared = 0;
103 master = 0;
104 subport_cnt = 1;
105 } else {
106 shared = 1;
107 master = !subport_fp(fp);
108 }
109
110 sz = sizeof(*kinfo);
111 /* If port sharing is not requested, allow the old size structure */
112 if (!shared)
113 sz -= 7 * sizeof(u64);
114 if (ubase_size < sz) {
115 ipath_cdbg(PROC,
116 "Base size %zu, need %zu (version mismatch?)\n",
117 ubase_size, sz);
118 ret = -EINVAL;
119 goto bail;
120 }
121
122 kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
123 if (kinfo == NULL) {
124 ret = -ENOMEM;
125 goto bail;
126 }
127
128 ret = dd->ipath_f_get_base_info(pd, kinfo);
129 if (ret < 0)
130 goto bail;
131
132 kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
133 kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
134 kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
135 kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
136 /*
137 * have to mmap whole thing
138 */
139 kinfo->spi_rcv_egrbuftotlen =
140 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
141 kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
142 kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
143 pd->port_rcvegrbuf_chunks;
144 kinfo->spi_tidcnt = dd->ipath_rcvtidcnt / subport_cnt;
145 if (master)
146 kinfo->spi_tidcnt += dd->ipath_rcvtidcnt % subport_cnt;
147 /*
148 * for this use, may be ipath_cfgports summed over all chips that
149 * are are configured and present
150 */
151 kinfo->spi_nports = dd->ipath_cfgports;
152 /* unit (chip/board) our port is on */
153 kinfo->spi_unit = dd->ipath_unit;
154 /* for now, only a single page */
155 kinfo->spi_tid_maxsize = PAGE_SIZE;
156
157 /*
158 * Doing this per port, and based on the skip value, etc. This has
159 * to be the actual buffer size, since the protocol code treats it
160 * as an array.
161 *
162 * These have to be set to user addresses in the user code via mmap.
163 * These values are used on return to user code for the mmap target
164 * addresses only. For 32 bit, same 44 bit address problem, so use
165 * the physical address, not virtual. Before 2.6.11, using the
166 * page_address() macro worked, but in 2.6.11, even that returns the
167 * full 64 bit address (upper bits all 1's). So far, using the
168 * physical addresses (or chip offsets, for chip mapping) works, but
169 * no doubt some future kernel release will change that, and we'll be
170 * on to yet another method of dealing with this.
171 */
172 kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
173 kinfo->spi_rcvhdr_tailaddr = (u64) pd->port_rcvhdrqtailaddr_phys;
174 kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
175 kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
176 kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
177 (void *) dd->ipath_statusp -
178 (void *) dd->ipath_pioavailregs_dma;
179 if (!shared) {
180 kinfo->spi_piocnt = pd->port_piocnt;
181 kinfo->spi_piobufbase = (u64) pd->port_piobufs;
182 kinfo->__spi_uregbase = (u64) dd->ipath_uregbase +
183 dd->ipath_ureg_align * pd->port_port;
184 } else if (master) {
185 kinfo->spi_piocnt = (pd->port_piocnt / subport_cnt) +
186 (pd->port_piocnt % subport_cnt);
187 /* Master's PIO buffers are after all the slave's */
188 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
189 dd->ipath_palign *
190 (pd->port_piocnt - kinfo->spi_piocnt);
191 } else {
192 unsigned slave = subport_fp(fp) - 1;
193
194 kinfo->spi_piocnt = pd->port_piocnt / subport_cnt;
195 kinfo->spi_piobufbase = (u64) pd->port_piobufs +
196 dd->ipath_palign * kinfo->spi_piocnt * slave;
197 }
198
199 if (shared) {
200 kinfo->spi_port_uregbase = (u64) dd->ipath_uregbase +
201 dd->ipath_ureg_align * pd->port_port;
202 kinfo->spi_port_rcvegrbuf = kinfo->spi_rcv_egrbufs;
203 kinfo->spi_port_rcvhdr_base = kinfo->spi_rcvhdr_base;
204 kinfo->spi_port_rcvhdr_tailaddr = kinfo->spi_rcvhdr_tailaddr;
205
206 kinfo->__spi_uregbase = cvt_kvaddr(pd->subport_uregbase +
207 PAGE_SIZE * subport_fp(fp));
208
209 kinfo->spi_rcvhdr_base = cvt_kvaddr(pd->subport_rcvhdr_base +
210 pd->port_rcvhdrq_size * subport_fp(fp));
211 kinfo->spi_rcvhdr_tailaddr = 0;
212 kinfo->spi_rcv_egrbufs = cvt_kvaddr(pd->subport_rcvegrbuf +
213 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size *
214 subport_fp(fp));
215
216 kinfo->spi_subport_uregbase =
217 cvt_kvaddr(pd->subport_uregbase);
218 kinfo->spi_subport_rcvegrbuf =
219 cvt_kvaddr(pd->subport_rcvegrbuf);
220 kinfo->spi_subport_rcvhdr_base =
221 cvt_kvaddr(pd->subport_rcvhdr_base);
222 ipath_cdbg(PROC, "port %u flags %x %llx %llx %llx\n",
223 kinfo->spi_port, kinfo->spi_runtime_flags,
224 (unsigned long long) kinfo->spi_subport_uregbase,
225 (unsigned long long) kinfo->spi_subport_rcvegrbuf,
226 (unsigned long long) kinfo->spi_subport_rcvhdr_base);
227 }
228
229 /*
230 * All user buffers are 2KB buffers. If we ever support
231 * giving 4KB buffers to user processes, this will need some
232 * work.
233 */
234 kinfo->spi_pioindex = (kinfo->spi_piobufbase -
235 (dd->ipath_piobufbase & 0xffffffff)) / dd->ipath_palign;
236 kinfo->spi_pioalign = dd->ipath_palign;
237
238 kinfo->spi_qpair = IPATH_KD_QP;
239 /*
240 * user mode PIO buffers are always 2KB, even when 4KB can
241 * be received, and sent via the kernel; this is ibmaxlen
242 * for 2K MTU.
243 */
244 kinfo->spi_piosize = dd->ipath_piosize2k - 2 * sizeof(u32);
245 kinfo->spi_mtu = dd->ipath_ibmaxlen; /* maxlen, not ibmtu */
246 kinfo->spi_port = pd->port_port;
247 kinfo->spi_subport = subport_fp(fp);
248 kinfo->spi_sw_version = IPATH_KERN_SWVERSION;
249 kinfo->spi_hw_version = dd->ipath_revision;
250
251 if (master) {
252 kinfo->spi_runtime_flags |= IPATH_RUNTIME_MASTER;
253 }
254
255 sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
256 if (copy_to_user(ubase, kinfo, sz))
257 ret = -EFAULT;
258
259bail:
260 kfree(kinfo);
261 return ret;
262}
263
264/**
265 * ipath_tid_update - update a port TID
266 * @pd: the port
267 * @fp: the ipath device file
268 * @ti: the TID information
269 *
270 * The new implementation as of Oct 2004 is that the driver assigns
271 * the tid and returns it to the caller. To make it easier to
272 * catch bugs, and to reduce search time, we keep a cursor for
273 * each port, walking the shadow tid array to find one that's not
274 * in use.
275 *
276 * For now, if we can't allocate the full list, we fail, although
277 * in the long run, we'll allocate as many as we can, and the
278 * caller will deal with that by trying the remaining pages later.
279 * That means that when we fail, we have to mark the tids as not in
280 * use again, in our shadow copy.
281 *
282 * It's up to the caller to free the tids when they are done.
283 * We'll unlock the pages as they free them.
284 *
285 * Also, right now we are locking one page at a time, but since
286 * the intended use of this routine is for a single group of
287 * virtually contiguous pages, that should change to improve
288 * performance.
289 */
290static int ipath_tid_update(struct ipath_portdata *pd, struct file *fp,
291 const struct ipath_tid_info *ti)
292{
293 int ret = 0, ntids;
294 u32 tid, porttid, cnt, i, tidcnt, tidoff;
295 u16 *tidlist;
296 struct ipath_devdata *dd = pd->port_dd;
297 u64 physaddr;
298 unsigned long vaddr;
299 u64 __iomem *tidbase;
300 unsigned long tidmap[8];
301 struct page **pagep = NULL;
302 unsigned subport = subport_fp(fp);
303
304 if (!dd->ipath_pageshadow) {
305 ret = -ENOMEM;
306 goto done;
307 }
308
309 cnt = ti->tidcnt;
310 if (!cnt) {
311 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
312 (unsigned long long) ti->tidlist);
313 /*
314 * Should we treat as success? likely a bug
315 */
316 ret = -EFAULT;
317 goto done;
318 }
319 porttid = pd->port_port * dd->ipath_rcvtidcnt;
320 if (!pd->port_subport_cnt) {
321 tidcnt = dd->ipath_rcvtidcnt;
322 tid = pd->port_tidcursor;
323 tidoff = 0;
324 } else if (!subport) {
325 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
326 (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
327 tidoff = dd->ipath_rcvtidcnt - tidcnt;
328 porttid += tidoff;
329 tid = tidcursor_fp(fp);
330 } else {
331 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
332 tidoff = tidcnt * (subport - 1);
333 porttid += tidoff;
334 tid = tidcursor_fp(fp);
335 }
336 if (cnt > tidcnt) {
337 /* make sure it all fits in port_tid_pg_list */
338 dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
339 "TIDs, only trying max (%u)\n", cnt, tidcnt);
340 cnt = tidcnt;
341 }
342 pagep = &((struct page **) pd->port_tid_pg_list)[tidoff];
343 tidlist = &((u16 *) &pagep[dd->ipath_rcvtidcnt])[tidoff];
344
345 memset(tidmap, 0, sizeof(tidmap));
346 /* before decrement; chip actual # */
347 ntids = tidcnt;
348 tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
349 dd->ipath_rcvtidbase +
350 porttid * sizeof(*tidbase));
351
352 ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
353 pd->port_port, cnt, tid, tidbase);
354
355 /* virtual address of first page in transfer */
356 vaddr = ti->tidvaddr;
357 if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
358 cnt * PAGE_SIZE)) {
359 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
360 (void *)vaddr, cnt);
361 ret = -EFAULT;
362 goto done;
363 }
364 ret = ipath_get_user_pages(vaddr, cnt, pagep);
365 if (ret) {
366 if (ret == -EBUSY) {
367 ipath_dbg("Failed to lock addr %p, %u pages "
368 "(already locked)\n",
369 (void *) vaddr, cnt);
370 /*
371 * for now, continue, and see what happens but with
372 * the new implementation, this should never happen,
373 * unless perhaps the user has mpin'ed the pages
374 * themselves (something we need to test)
375 */
376 ret = 0;
377 } else {
378 dev_info(&dd->pcidev->dev,
379 "Failed to lock addr %p, %u pages: "
380 "errno %d\n", (void *) vaddr, cnt, -ret);
381 goto done;
382 }
383 }
384 for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
385 for (; ntids--; tid++) {
386 if (tid == tidcnt)
387 tid = 0;
388 if (!dd->ipath_pageshadow[porttid + tid])
389 break;
390 }
391 if (ntids < 0) {
392 /*
393 * oops, wrapped all the way through their TIDs,
394 * and didn't have enough free; see comments at
395 * start of routine
396 */
397 ipath_dbg("Not enough free TIDs for %u pages "
398 "(index %d), failing\n", cnt, i);
399 i--; /* last tidlist[i] not filled in */
400 ret = -ENOMEM;
401 break;
402 }
403 tidlist[i] = tid + tidoff;
404 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
405 "vaddr %lx\n", i, tid + tidoff, vaddr);
406 /* we "know" system pages and TID pages are same size */
407 dd->ipath_pageshadow[porttid + tid] = pagep[i];
408 dd->ipath_physshadow[porttid + tid] = ipath_map_page(
409 dd->pcidev, pagep[i], 0, PAGE_SIZE,
410 PCI_DMA_FROMDEVICE);
411 /*
412 * don't need atomic or it's overhead
413 */
414 __set_bit(tid, tidmap);
415 physaddr = dd->ipath_physshadow[porttid + tid];
416 ipath_stats.sps_pagelocks++;
417 ipath_cdbg(VERBOSE,
418 "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
419 tid, vaddr, (unsigned long long) physaddr,
420 pagep[i]);
421 dd->ipath_f_put_tid(dd, &tidbase[tid], RCVHQ_RCV_TYPE_EXPECTED,
422 physaddr);
423 /*
424 * don't check this tid in ipath_portshadow, since we
425 * just filled it in; start with the next one.
426 */
427 tid++;
428 }
429
430 if (ret) {
431 u32 limit;
432 cleanup:
433 /* jump here if copy out of updated info failed... */
434 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
435 -ret, i, cnt);
436 /* same code that's in ipath_free_tid() */
437 limit = sizeof(tidmap) * BITS_PER_BYTE;
438 if (limit > tidcnt)
439 /* just in case size changes in future */
440 limit = tidcnt;
441 tid = find_first_bit((const unsigned long *)tidmap, limit);
442 for (; tid < limit; tid++) {
443 if (!test_bit(tid, tidmap))
444 continue;
445 if (dd->ipath_pageshadow[porttid + tid]) {
446 ipath_cdbg(VERBOSE, "Freeing TID %u\n",
447 tid);
448 dd->ipath_f_put_tid(dd, &tidbase[tid],
449 RCVHQ_RCV_TYPE_EXPECTED,
450 dd->ipath_tidinvalid);
451 pci_unmap_page(dd->pcidev,
452 dd->ipath_physshadow[porttid + tid],
453 PAGE_SIZE, PCI_DMA_FROMDEVICE);
454 dd->ipath_pageshadow[porttid + tid] = NULL;
455 ipath_stats.sps_pageunlocks++;
456 }
457 }
458 ipath_release_user_pages(pagep, cnt);
459 } else {
460 /*
461 * Copy the updated array, with ipath_tid's filled in, back
462 * to user. Since we did the copy in already, this "should
463 * never fail" If it does, we have to clean up...
464 */
465 if (copy_to_user((void __user *)
466 (unsigned long) ti->tidlist,
467 tidlist, cnt * sizeof(*tidlist))) {
468 ret = -EFAULT;
469 goto cleanup;
470 }
471 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
472 tidmap, sizeof tidmap)) {
473 ret = -EFAULT;
474 goto cleanup;
475 }
476 if (tid == tidcnt)
477 tid = 0;
478 if (!pd->port_subport_cnt)
479 pd->port_tidcursor = tid;
480 else
481 tidcursor_fp(fp) = tid;
482 }
483
484done:
485 if (ret)
486 ipath_dbg("Failed to map %u TID pages, failing with %d\n",
487 ti->tidcnt, -ret);
488 return ret;
489}
490
491/**
492 * ipath_tid_free - free a port TID
493 * @pd: the port
494 * @subport: the subport
495 * @ti: the TID info
496 *
497 * right now we are unlocking one page at a time, but since
498 * the intended use of this routine is for a single group of
499 * virtually contiguous pages, that should change to improve
500 * performance. We check that the TID is in range for this port
501 * but otherwise don't check validity; if user has an error and
502 * frees the wrong tid, it's only their own data that can thereby
503 * be corrupted. We do check that the TID was in use, for sanity
504 * We always use our idea of the saved address, not the address that
505 * they pass in to us.
506 */
507
508static int ipath_tid_free(struct ipath_portdata *pd, unsigned subport,
509 const struct ipath_tid_info *ti)
510{
511 int ret = 0;
512 u32 tid, porttid, cnt, limit, tidcnt;
513 struct ipath_devdata *dd = pd->port_dd;
514 u64 __iomem *tidbase;
515 unsigned long tidmap[8];
516
517 if (!dd->ipath_pageshadow) {
518 ret = -ENOMEM;
519 goto done;
520 }
521
522 if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
523 sizeof tidmap)) {
524 ret = -EFAULT;
525 goto done;
526 }
527
528 porttid = pd->port_port * dd->ipath_rcvtidcnt;
529 if (!pd->port_subport_cnt)
530 tidcnt = dd->ipath_rcvtidcnt;
531 else if (!subport) {
532 tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
533 (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
534 porttid += dd->ipath_rcvtidcnt - tidcnt;
535 } else {
536 tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
537 porttid += tidcnt * (subport - 1);
538 }
539 tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
540 dd->ipath_rcvtidbase +
541 porttid * sizeof(*tidbase));
542
543 limit = sizeof(tidmap) * BITS_PER_BYTE;
544 if (limit > tidcnt)
545 /* just in case size changes in future */
546 limit = tidcnt;
547 tid = find_first_bit(tidmap, limit);
548 ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
549 "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
550 limit, tid, porttid);
551 for (cnt = 0; tid < limit; tid++) {
552 /*
553 * small optimization; if we detect a run of 3 or so without
554 * any set, use find_first_bit again. That's mainly to
555 * accelerate the case where we wrapped, so we have some at
556 * the beginning, and some at the end, and a big gap
557 * in the middle.
558 */
559 if (!test_bit(tid, tidmap))
560 continue;
561 cnt++;
562 if (dd->ipath_pageshadow[porttid + tid]) {
563 struct page *p;
564 p = dd->ipath_pageshadow[porttid + tid];
565 dd->ipath_pageshadow[porttid + tid] = NULL;
566 ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
567 pid_nr(pd->port_pid), tid);
568 dd->ipath_f_put_tid(dd, &tidbase[tid],
569 RCVHQ_RCV_TYPE_EXPECTED,
570 dd->ipath_tidinvalid);
571 pci_unmap_page(dd->pcidev,
572 dd->ipath_physshadow[porttid + tid],
573 PAGE_SIZE, PCI_DMA_FROMDEVICE);
574 ipath_release_user_pages(&p, 1);
575 ipath_stats.sps_pageunlocks++;
576 } else
577 ipath_dbg("Unused tid %u, ignoring\n", tid);
578 }
579 if (cnt != ti->tidcnt)
580 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
581 ti->tidcnt, cnt);
582done:
583 if (ret)
584 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
585 ti->tidcnt, -ret);
586 return ret;
587}
588
589/**
590 * ipath_set_part_key - set a partition key
591 * @pd: the port
592 * @key: the key
593 *
594 * We can have up to 4 active at a time (other than the default, which is
595 * always allowed). This is somewhat tricky, since multiple ports may set
596 * the same key, so we reference count them, and clean up at exit. All 4
597 * partition keys are packed into a single infinipath register. It's an
598 * error for a process to set the same pkey multiple times. We provide no
599 * mechanism to de-allocate a pkey at this time, we may eventually need to
600 * do that. I've used the atomic operations, and no locking, and only make
601 * a single pass through what's available. This should be more than
602 * adequate for some time. I'll think about spinlocks or the like if and as
603 * it's necessary.
604 */
605static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
606{
607 struct ipath_devdata *dd = pd->port_dd;
608 int i, any = 0, pidx = -1;
609 u16 lkey = key & 0x7FFF;
610 int ret;
611
612 if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) {
613 /* nothing to do; this key always valid */
614 ret = 0;
615 goto bail;
616 }
617
618 ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
619 "%hx:%x %hx:%x %hx:%x %hx:%x\n",
620 pd->port_port, key, dd->ipath_pkeys[0],
621 atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
622 atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
623 atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
624 atomic_read(&dd->ipath_pkeyrefs[3]));
625
626 if (!lkey) {
627 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
628 pd->port_port);
629 ret = -EINVAL;
630 goto bail;
631 }
632
633 /*
634 * Set the full membership bit, because it has to be
635 * set in the register or the packet, and it seems
636 * cleaner to set in the register than to force all
637 * callers to set it. (see bug 4331)
638 */
639 key |= 0x8000;
640
641 for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
642 if (!pd->port_pkeys[i] && pidx == -1)
643 pidx = i;
644 if (pd->port_pkeys[i] == key) {
645 ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
646 "(%x) more than once\n",
647 pd->port_port, key);
648 ret = -EEXIST;
649 goto bail;
650 }
651 }
652 if (pidx == -1) {
653 ipath_dbg("All pkeys for port %u already in use, "
654 "can't set %x\n", pd->port_port, key);
655 ret = -EBUSY;
656 goto bail;
657 }
658 for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
659 if (!dd->ipath_pkeys[i]) {
660 any++;
661 continue;
662 }
663 if (dd->ipath_pkeys[i] == key) {
664 atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];
665
666 if (atomic_inc_return(pkrefs) > 1) {
667 pd->port_pkeys[pidx] = key;
668 ipath_cdbg(VERBOSE, "p%u set key %x "
669 "matches #%d, count now %d\n",
670 pd->port_port, key, i,
671 atomic_read(pkrefs));
672 ret = 0;
673 goto bail;
674 } else {
675 /*
676 * lost race, decrement count, catch below
677 */
678 atomic_dec(pkrefs);
679 ipath_cdbg(VERBOSE, "Lost race, count was "
680 "0, after dec, it's %d\n",
681 atomic_read(pkrefs));
682 any++;
683 }
684 }
685 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
686 /*
687 * It makes no sense to have both the limited and
688 * full membership PKEY set at the same time since
689 * the unlimited one will disable the limited one.
690 */
691 ret = -EEXIST;
692 goto bail;
693 }
694 }
695 if (!any) {
696 ipath_dbg("port %u, all pkeys already in use, "
697 "can't set %x\n", pd->port_port, key);
698 ret = -EBUSY;
699 goto bail;
700 }
701 for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
702 if (!dd->ipath_pkeys[i] &&
703 atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
704 u64 pkey;
705
706 /* for ipathstats, etc. */
707 ipath_stats.sps_pkeys[i] = lkey;
708 pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
709 pkey =
710 (u64) dd->ipath_pkeys[0] |
711 ((u64) dd->ipath_pkeys[1] << 16) |
712 ((u64) dd->ipath_pkeys[2] << 32) |
713 ((u64) dd->ipath_pkeys[3] << 48);
714 ipath_cdbg(PROC, "p%u set key %x in #%d, "
715 "portidx %d, new pkey reg %llx\n",
716 pd->port_port, key, i, pidx,
717 (unsigned long long) pkey);
718 ipath_write_kreg(
719 dd, dd->ipath_kregs->kr_partitionkey, pkey);
720
721 ret = 0;
722 goto bail;
723 }
724 }
725 ipath_dbg("port %u, all pkeys already in use 2nd pass, "
726 "can't set %x\n", pd->port_port, key);
727 ret = -EBUSY;
728
729bail:
730 return ret;
731}
732
733/**
734 * ipath_manage_rcvq - manage a port's receive queue
735 * @pd: the port
736 * @subport: the subport
737 * @start_stop: action to carry out
738 *
739 * start_stop == 0 disables receive on the port, for use in queue
740 * overflow conditions. start_stop==1 re-enables, to be used to
741 * re-init the software copy of the head register
742 */
743static int ipath_manage_rcvq(struct ipath_portdata *pd, unsigned subport,
744 int start_stop)
745{
746 struct ipath_devdata *dd = pd->port_dd;
747
748 ipath_cdbg(PROC, "%sabling rcv for unit %u port %u:%u\n",
749 start_stop ? "en" : "dis", dd->ipath_unit,
750 pd->port_port, subport);
751 if (subport)
752 goto bail;
753 /* atomically clear receive enable port. */
754 if (start_stop) {
755 /*
756 * On enable, force in-memory copy of the tail register to
757 * 0, so that protocol code doesn't have to worry about
758 * whether or not the chip has yet updated the in-memory
759 * copy or not on return from the system call. The chip
760 * always resets it's tail register back to 0 on a
761 * transition from disabled to enabled. This could cause a
762 * problem if software was broken, and did the enable w/o
763 * the disable, but eventually the in-memory copy will be
764 * updated and correct itself, even in the face of software
765 * bugs.
766 */
767 if (pd->port_rcvhdrtail_kvaddr)
768 ipath_clear_rcvhdrtail(pd);
769 set_bit(dd->ipath_r_portenable_shift + pd->port_port,
770 &dd->ipath_rcvctrl);
771 } else
772 clear_bit(dd->ipath_r_portenable_shift + pd->port_port,
773 &dd->ipath_rcvctrl);
774 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
775 dd->ipath_rcvctrl);
776 /* now be sure chip saw it before we return */
777 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
778 if (start_stop) {
779 /*
780 * And try to be sure that tail reg update has happened too.
781 * This should in theory interlock with the RXE changes to
782 * the tail register. Don't assign it to the tail register
783 * in memory copy, since we could overwrite an update by the
784 * chip if we did.
785 */
786 ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
787 }
788 /* always; new head should be equal to new tail; see above */
789bail:
790 return 0;
791}
792
793static void ipath_clean_part_key(struct ipath_portdata *pd,
794 struct ipath_devdata *dd)
795{
796 int i, j, pchanged = 0;
797 u64 oldpkey;
798
799 /* for debugging only */
800 oldpkey = (u64) dd->ipath_pkeys[0] |
801 ((u64) dd->ipath_pkeys[1] << 16) |
802 ((u64) dd->ipath_pkeys[2] << 32) |
803 ((u64) dd->ipath_pkeys[3] << 48);
804
805 for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
806 if (!pd->port_pkeys[i])
807 continue;
808 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
809 pd->port_pkeys[i]);
810 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
811 /* check for match independent of the global bit */
812 if ((dd->ipath_pkeys[j] & 0x7fff) !=
813 (pd->port_pkeys[i] & 0x7fff))
814 continue;
815 if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
816 ipath_cdbg(VERBOSE, "p%u clear key "
817 "%x matches #%d\n",
818 pd->port_port,
819 pd->port_pkeys[i], j);
820 ipath_stats.sps_pkeys[j] =
821 dd->ipath_pkeys[j] = 0;
822 pchanged++;
823 }
824 else ipath_cdbg(
825 VERBOSE, "p%u key %x matches #%d, "
826 "but ref still %d\n", pd->port_port,
827 pd->port_pkeys[i], j,
828 atomic_read(&dd->ipath_pkeyrefs[j]));
829 break;
830 }
831 pd->port_pkeys[i] = 0;
832 }
833 if (pchanged) {
834 u64 pkey = (u64) dd->ipath_pkeys[0] |
835 ((u64) dd->ipath_pkeys[1] << 16) |
836 ((u64) dd->ipath_pkeys[2] << 32) |
837 ((u64) dd->ipath_pkeys[3] << 48);
838 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
839 "new pkey reg %llx\n", pd->port_port,
840 (unsigned long long) oldpkey,
841 (unsigned long long) pkey);
842 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
843 pkey);
844 }
845}
846
847/*
848 * Initialize the port data with the receive buffer sizes
849 * so this can be done while the master port is locked.
850 * Otherwise, there is a race with a slave opening the port
851 * and seeing these fields uninitialized.
852 */
853static void init_user_egr_sizes(struct ipath_portdata *pd)
854{
855 struct ipath_devdata *dd = pd->port_dd;
856 unsigned egrperchunk, egrcnt, size;
857
858 /*
859 * to avoid wasting a lot of memory, we allocate 32KB chunks of
860 * physically contiguous memory, advance through it until used up
861 * and then allocate more. Of course, we need memory to store those
862 * extra pointers, now. Started out with 256KB, but under heavy
863 * memory pressure (creating large files and then copying them over
864 * NFS while doing lots of MPI jobs), we hit some allocation
865 * failures, even though we can sleep... (2.6.10) Still get
866 * failures at 64K. 32K is the lowest we can go without wasting
867 * additional memory.
868 */
869 size = 0x8000;
870 egrperchunk = size / dd->ipath_rcvegrbufsize;
871 egrcnt = dd->ipath_rcvegrcnt;
872 pd->port_rcvegrbuf_chunks = (egrcnt + egrperchunk - 1) / egrperchunk;
873 pd->port_rcvegrbufs_perchunk = egrperchunk;
874 pd->port_rcvegrbuf_size = size;
875}
876
877/**
878 * ipath_create_user_egr - allocate eager TID buffers
879 * @pd: the port to allocate TID buffers for
880 *
881 * This routine is now quite different for user and kernel, because
882 * the kernel uses skb's, for the accelerated network performance
883 * This is the user port version
884 *
885 * Allocate the eager TID buffers and program them into infinipath
886 * They are no longer completely contiguous, we do multiple allocation
887 * calls.
888 */
889static int ipath_create_user_egr(struct ipath_portdata *pd)
890{
891 struct ipath_devdata *dd = pd->port_dd;
892 unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
893 size_t size;
894 int ret;
895 gfp_t gfp_flags;
896
897 /*
898 * GFP_USER, but without GFP_FS, so buffer cache can be
899 * coalesced (we hope); otherwise, even at order 4,
900 * heavy filesystem activity makes these fail, and we can
901 * use compound pages.
902 */
903 gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
904
905 egrcnt = dd->ipath_rcvegrcnt;
906 /* TID number offset for this port */
907 egroff = (pd->port_port - 1) * egrcnt + dd->ipath_p0_rcvegrcnt;
908 egrsize = dd->ipath_rcvegrbufsize;
909 ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
910 "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);
911
912 chunk = pd->port_rcvegrbuf_chunks;
913 egrperchunk = pd->port_rcvegrbufs_perchunk;
914 size = pd->port_rcvegrbuf_size;
915 pd->port_rcvegrbuf = kmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]),
916 GFP_KERNEL);
917 if (!pd->port_rcvegrbuf) {
918 ret = -ENOMEM;
919 goto bail;
920 }
921 pd->port_rcvegrbuf_phys =
922 kmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]),
923 GFP_KERNEL);
924 if (!pd->port_rcvegrbuf_phys) {
925 ret = -ENOMEM;
926 goto bail_rcvegrbuf;
927 }
928 for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {
929
930 pd->port_rcvegrbuf[e] = dma_alloc_coherent(
931 &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
932 gfp_flags);
933
934 if (!pd->port_rcvegrbuf[e]) {
935 ret = -ENOMEM;
936 goto bail_rcvegrbuf_phys;
937 }
938 }
939
940 pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];
941
942 for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
943 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
944 unsigned i;
945
946 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
947 dd->ipath_f_put_tid(dd, e + egroff +
948 (u64 __iomem *)
949 ((char __iomem *)
950 dd->ipath_kregbase +
951 dd->ipath_rcvegrbase),
952 RCVHQ_RCV_TYPE_EAGER, pa);
953 pa += egrsize;
954 }
955 cond_resched(); /* don't hog the cpu */
956 }
957
958 ret = 0;
959 goto bail;
960
961bail_rcvegrbuf_phys:
962 for (e = 0; e < pd->port_rcvegrbuf_chunks &&
963 pd->port_rcvegrbuf[e]; e++) {
964 dma_free_coherent(&dd->pcidev->dev, size,
965 pd->port_rcvegrbuf[e],
966 pd->port_rcvegrbuf_phys[e]);
967
968 }
969 kfree(pd->port_rcvegrbuf_phys);
970 pd->port_rcvegrbuf_phys = NULL;
971bail_rcvegrbuf:
972 kfree(pd->port_rcvegrbuf);
973 pd->port_rcvegrbuf = NULL;
974bail:
975 return ret;
976}
977
978
979/* common code for the mappings on dma_alloc_coherent mem */
980static int ipath_mmap_mem(struct vm_area_struct *vma,
981 struct ipath_portdata *pd, unsigned len, int write_ok,
982 void *kvaddr, char *what)
983{
984 struct ipath_devdata *dd = pd->port_dd;
985 unsigned long pfn;
986 int ret;
987
988 if ((vma->vm_end - vma->vm_start) > len) {
989 dev_info(&dd->pcidev->dev,
990 "FAIL on %s: len %lx > %x\n", what,
991 vma->vm_end - vma->vm_start, len);
992 ret = -EFAULT;
993 goto bail;
994 }
995
996 if (!write_ok) {
997 if (vma->vm_flags & VM_WRITE) {
998 dev_info(&dd->pcidev->dev,
999 "%s must be mapped readonly\n", what);
1000 ret = -EPERM;
1001 goto bail;
1002 }
1003
1004 /* don't allow them to later change with mprotect */
1005 vma->vm_flags &= ~VM_MAYWRITE;
1006 }
1007
1008 pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
1009 ret = remap_pfn_range(vma, vma->vm_start, pfn,
1010 len, vma->vm_page_prot);
1011 if (ret)
1012 dev_info(&dd->pcidev->dev, "%s port%u mmap of %lx, %x "
1013 "bytes r%c failed: %d\n", what, pd->port_port,
1014 pfn, len, write_ok?'w':'o', ret);
1015 else
1016 ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes "
1017 "r%c\n", what, pd->port_port, pfn, len,
1018 write_ok?'w':'o');
1019bail:
1020 return ret;
1021}
1022
1023static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
1024 u64 ureg)
1025{
1026 unsigned long phys;
1027 int ret;
1028
1029 /*
1030 * This is real hardware, so use io_remap. This is the mechanism
1031 * for the user process to update the head registers for their port
1032 * in the chip.
1033 */
1034 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
1035 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
1036 "%lx > PAGE\n", vma->vm_end - vma->vm_start);
1037 ret = -EFAULT;
1038 } else {
1039 phys = dd->ipath_physaddr + ureg;
1040 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1041
1042 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1043 ret = io_remap_pfn_range(vma, vma->vm_start,
1044 phys >> PAGE_SHIFT,
1045 vma->vm_end - vma->vm_start,
1046 vma->vm_page_prot);
1047 }
1048 return ret;
1049}
1050
1051static int mmap_piobufs(struct vm_area_struct *vma,
1052 struct ipath_devdata *dd,
1053 struct ipath_portdata *pd,
1054 unsigned piobufs, unsigned piocnt)
1055{
1056 unsigned long phys;
1057 int ret;
1058
1059 /*
1060 * When we map the PIO buffers in the chip, we want to map them as
1061 * writeonly, no read possible. This prevents access to previous
1062 * process data, and catches users who might try to read the i/o
1063 * space due to a bug.
1064 */
1065 if ((vma->vm_end - vma->vm_start) > (piocnt * dd->ipath_palign)) {
1066 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
1067 "reqlen %lx > PAGE\n",
1068 vma->vm_end - vma->vm_start);
1069 ret = -EINVAL;
1070 goto bail;
1071 }
1072
1073 phys = dd->ipath_physaddr + piobufs;
1074
1075#if defined(__powerpc__)
1076 /* There isn't a generic way to specify writethrough mappings */
1077 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
1078 pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
1079 pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
1080#endif
1081
1082 /*
1083 * don't allow them to later change to readable with mprotect (for when
1084 * not initially mapped readable, as is normally the case)
1085 */
1086 vma->vm_flags &= ~VM_MAYREAD;
1087 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
1088
1089 ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
1090 vma->vm_end - vma->vm_start,
1091 vma->vm_page_prot);
1092bail:
1093 return ret;
1094}
1095
1096static int mmap_rcvegrbufs(struct vm_area_struct *vma,
1097 struct ipath_portdata *pd)
1098{
1099 struct ipath_devdata *dd = pd->port_dd;
1100 unsigned long start, size;
1101 size_t total_size, i;
1102 unsigned long pfn;
1103 int ret;
1104
1105 size = pd->port_rcvegrbuf_size;
1106 total_size = pd->port_rcvegrbuf_chunks * size;
1107 if ((vma->vm_end - vma->vm_start) > total_size) {
1108 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
1109 "reqlen %lx > actual %lx\n",
1110 vma->vm_end - vma->vm_start,
1111 (unsigned long) total_size);
1112 ret = -EINVAL;
1113 goto bail;
1114 }
1115
1116 if (vma->vm_flags & VM_WRITE) {
1117 dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
1118 "writable (flags=%lx)\n", vma->vm_flags);
1119 ret = -EPERM;
1120 goto bail;
1121 }
1122 /* don't allow them to later change to writeable with mprotect */
1123 vma->vm_flags &= ~VM_MAYWRITE;
1124
1125 start = vma->vm_start;
1126
1127 for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
1128 pfn = virt_to_phys(pd->port_rcvegrbuf[i]) >> PAGE_SHIFT;
1129 ret = remap_pfn_range(vma, start, pfn, size,
1130 vma->vm_page_prot);
1131 if (ret < 0)
1132 goto bail;
1133 }
1134 ret = 0;
1135
1136bail:
1137 return ret;
1138}
1139
1140/*
1141 * ipath_file_vma_fault - handle a VMA page fault.
1142 */
1143static int ipath_file_vma_fault(struct vm_area_struct *vma,
1144 struct vm_fault *vmf)
1145{
1146 struct page *page;
1147
1148 page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
1149 if (!page)
1150 return VM_FAULT_SIGBUS;
1151 get_page(page);
1152 vmf->page = page;
1153
1154 return 0;
1155}
1156
1157static const struct vm_operations_struct ipath_file_vm_ops = {
1158 .fault = ipath_file_vma_fault,
1159};
1160
1161static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
1162 struct ipath_portdata *pd, unsigned subport)
1163{
1164 unsigned long len;
1165 struct ipath_devdata *dd;
1166 void *addr;
1167 size_t size;
1168 int ret = 0;
1169
1170 /* If the port is not shared, all addresses should be physical */
1171 if (!pd->port_subport_cnt)
1172 goto bail;
1173
1174 dd = pd->port_dd;
1175 size = pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
1176
1177 /*
1178 * Each process has all the subport uregbase, rcvhdrq, and
1179 * rcvegrbufs mmapped - as an array for all the processes,
1180 * and also separately for this process.
1181 */
1182 if (pgaddr == cvt_kvaddr(pd->subport_uregbase)) {
1183 addr = pd->subport_uregbase;
1184 size = PAGE_SIZE * pd->port_subport_cnt;
1185 } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base)) {
1186 addr = pd->subport_rcvhdr_base;
1187 size = pd->port_rcvhdrq_size * pd->port_subport_cnt;
1188 } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf)) {
1189 addr = pd->subport_rcvegrbuf;
1190 size *= pd->port_subport_cnt;
1191 } else if (pgaddr == cvt_kvaddr(pd->subport_uregbase +
1192 PAGE_SIZE * subport)) {
1193 addr = pd->subport_uregbase + PAGE_SIZE * subport;
1194 size = PAGE_SIZE;
1195 } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base +
1196 pd->port_rcvhdrq_size * subport)) {
1197 addr = pd->subport_rcvhdr_base +
1198 pd->port_rcvhdrq_size * subport;
1199 size = pd->port_rcvhdrq_size;
1200 } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf +
1201 size * subport)) {
1202 addr = pd->subport_rcvegrbuf + size * subport;
1203 /* rcvegrbufs are read-only on the slave */
1204 if (vma->vm_flags & VM_WRITE) {
1205 dev_info(&dd->pcidev->dev,
1206 "Can't map eager buffers as "
1207 "writable (flags=%lx)\n", vma->vm_flags);
1208 ret = -EPERM;
1209 goto bail;
1210 }
1211 /*
1212 * Don't allow permission to later change to writeable
1213 * with mprotect.
1214 */
1215 vma->vm_flags &= ~VM_MAYWRITE;
1216 } else {
1217 goto bail;
1218 }
1219 len = vma->vm_end - vma->vm_start;
1220 if (len > size) {
1221 ipath_cdbg(MM, "FAIL: reqlen %lx > %zx\n", len, size);
1222 ret = -EINVAL;
1223 goto bail;
1224 }
1225
1226 vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
1227 vma->vm_ops = &ipath_file_vm_ops;
1228 vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
1229 ret = 1;
1230
1231bail:
1232 return ret;
1233}
1234
1235/**
1236 * ipath_mmap - mmap various structures into user space
1237 * @fp: the file pointer
1238 * @vma: the VM area
1239 *
1240 * We use this to have a shared buffer between the kernel and the user code
1241 * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
1242 * buffers in the chip. We have the open and close entries so we can bump
1243 * the ref count and keep the driver from being unloaded while still mapped.
1244 */
1245static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
1246{
1247 struct ipath_portdata *pd;
1248 struct ipath_devdata *dd;
1249 u64 pgaddr, ureg;
1250 unsigned piobufs, piocnt;
1251 int ret;
1252
1253 pd = port_fp(fp);
1254 if (!pd) {
1255 ret = -EINVAL;
1256 goto bail;
1257 }
1258 dd = pd->port_dd;
1259
1260 /*
1261 * This is the ipath_do_user_init() code, mapping the shared buffers
1262 * into the user process. The address referred to by vm_pgoff is the
1263 * file offset passed via mmap(). For shared ports, this is the
1264 * kernel vmalloc() address of the pages to share with the master.
1265 * For non-shared or master ports, this is a physical address.
1266 * We only do one mmap for each space mapped.
1267 */
1268 pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1269
1270 /*
1271 * Check for 0 in case one of the allocations failed, but user
1272 * called mmap anyway.
1273 */
1274 if (!pgaddr) {
1275 ret = -EINVAL;
1276 goto bail;
1277 }
1278
1279 ipath_cdbg(MM, "pgaddr %llx vm_start=%lx len %lx port %u:%u:%u\n",
1280 (unsigned long long) pgaddr, vma->vm_start,
1281 vma->vm_end - vma->vm_start, dd->ipath_unit,
1282 pd->port_port, subport_fp(fp));
1283
1284 /*
1285 * Physical addresses must fit in 40 bits for our hardware.
1286 * Check for kernel virtual addresses first, anything else must
1287 * match a HW or memory address.
1288 */
1289 ret = mmap_kvaddr(vma, pgaddr, pd, subport_fp(fp));
1290 if (ret) {
1291 if (ret > 0)
1292 ret = 0;
1293 goto bail;
1294 }
1295
1296 ureg = dd->ipath_uregbase + dd->ipath_ureg_align * pd->port_port;
1297 if (!pd->port_subport_cnt) {
1298 /* port is not shared */
1299 piocnt = pd->port_piocnt;
1300 piobufs = pd->port_piobufs;
1301 } else if (!subport_fp(fp)) {
1302 /* caller is the master */
1303 piocnt = (pd->port_piocnt / pd->port_subport_cnt) +
1304 (pd->port_piocnt % pd->port_subport_cnt);
1305 piobufs = pd->port_piobufs +
1306 dd->ipath_palign * (pd->port_piocnt - piocnt);
1307 } else {
1308 unsigned slave = subport_fp(fp) - 1;
1309
1310 /* caller is a slave */
1311 piocnt = pd->port_piocnt / pd->port_subport_cnt;
1312 piobufs = pd->port_piobufs + dd->ipath_palign * piocnt * slave;
1313 }
1314
1315 if (pgaddr == ureg)
1316 ret = mmap_ureg(vma, dd, ureg);
1317 else if (pgaddr == piobufs)
1318 ret = mmap_piobufs(vma, dd, pd, piobufs, piocnt);
1319 else if (pgaddr == dd->ipath_pioavailregs_phys)
1320 /* in-memory copy of pioavail registers */
1321 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1322 (void *) dd->ipath_pioavailregs_dma,
1323 "pioavail registers");
1324 else if (pgaddr == pd->port_rcvegr_phys)
1325 ret = mmap_rcvegrbufs(vma, pd);
1326 else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
1327 /*
1328 * The rcvhdrq itself; readonly except on HT (so have
1329 * to allow writable mapping), multiple pages, contiguous
1330 * from an i/o perspective.
1331 */
1332 ret = ipath_mmap_mem(vma, pd, pd->port_rcvhdrq_size, 1,
1333 pd->port_rcvhdrq,
1334 "rcvhdrq");
1335 else if (pgaddr == (u64) pd->port_rcvhdrqtailaddr_phys)
1336 /* in-memory copy of rcvhdrq tail register */
1337 ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
1338 pd->port_rcvhdrtail_kvaddr,
1339 "rcvhdrq tail");
1340 else
1341 ret = -EINVAL;
1342
1343 vma->vm_private_data = NULL;
1344
1345 if (ret < 0)
1346 dev_info(&dd->pcidev->dev,
1347 "Failure %d on off %llx len %lx\n",
1348 -ret, (unsigned long long)pgaddr,
1349 vma->vm_end - vma->vm_start);
1350bail:
1351 return ret;
1352}
1353
1354static unsigned ipath_poll_hdrqfull(struct ipath_portdata *pd)
1355{
1356 unsigned pollflag = 0;
1357
1358 if ((pd->poll_type & IPATH_POLL_TYPE_OVERFLOW) &&
1359 pd->port_hdrqfull != pd->port_hdrqfull_poll) {
1360 pollflag |= POLLIN | POLLRDNORM;
1361 pd->port_hdrqfull_poll = pd->port_hdrqfull;
1362 }
1363
1364 return pollflag;
1365}
1366
1367static unsigned int ipath_poll_urgent(struct ipath_portdata *pd,
1368 struct file *fp,
1369 struct poll_table_struct *pt)
1370{
1371 unsigned pollflag = 0;
1372 struct ipath_devdata *dd;
1373
1374 dd = pd->port_dd;
1375
1376 /* variable access in ipath_poll_hdrqfull() needs this */
1377 rmb();
1378 pollflag = ipath_poll_hdrqfull(pd);
1379
1380 if (pd->port_urgent != pd->port_urgent_poll) {
1381 pollflag |= POLLIN | POLLRDNORM;
1382 pd->port_urgent_poll = pd->port_urgent;
1383 }
1384
1385 if (!pollflag) {
1386 /* this saves a spin_lock/unlock in interrupt handler... */
1387 set_bit(IPATH_PORT_WAITING_URG, &pd->port_flag);
1388 /* flush waiting flag so don't miss an event... */
1389 wmb();
1390 poll_wait(fp, &pd->port_wait, pt);
1391 }
1392
1393 return pollflag;
1394}
1395
1396static unsigned int ipath_poll_next(struct ipath_portdata *pd,
1397 struct file *fp,
1398 struct poll_table_struct *pt)
1399{
1400 u32 head;
1401 u32 tail;
1402 unsigned pollflag = 0;
1403 struct ipath_devdata *dd;
1404
1405 dd = pd->port_dd;
1406
1407 /* variable access in ipath_poll_hdrqfull() needs this */
1408 rmb();
1409 pollflag = ipath_poll_hdrqfull(pd);
1410
1411 head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
1412 if (pd->port_rcvhdrtail_kvaddr)
1413 tail = ipath_get_rcvhdrtail(pd);
1414 else
1415 tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
1416
1417 if (head != tail)
1418 pollflag |= POLLIN | POLLRDNORM;
1419 else {
1420 /* this saves a spin_lock/unlock in interrupt handler */
1421 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
1422 /* flush waiting flag so we don't miss an event */
1423 wmb();
1424
1425 set_bit(pd->port_port + dd->ipath_r_intravail_shift,
1426 &dd->ipath_rcvctrl);
1427
1428 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1429 dd->ipath_rcvctrl);
1430
1431 if (dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
1432 ipath_write_ureg(dd, ur_rcvhdrhead,
1433 dd->ipath_rhdrhead_intr_off | head,
1434 pd->port_port);
1435
1436 poll_wait(fp, &pd->port_wait, pt);
1437 }
1438
1439 return pollflag;
1440}
1441
1442static unsigned int ipath_poll(struct file *fp,
1443 struct poll_table_struct *pt)
1444{
1445 struct ipath_portdata *pd;
1446 unsigned pollflag;
1447
1448 pd = port_fp(fp);
1449 if (!pd)
1450 pollflag = 0;
1451 else if (pd->poll_type & IPATH_POLL_TYPE_URGENT)
1452 pollflag = ipath_poll_urgent(pd, fp, pt);
1453 else
1454 pollflag = ipath_poll_next(pd, fp, pt);
1455
1456 return pollflag;
1457}
1458
1459static int ipath_supports_subports(int user_swmajor, int user_swminor)
1460{
1461 /* no subport implementation prior to software version 1.3 */
1462 return (user_swmajor > 1) || (user_swminor >= 3);
1463}
1464
1465static int ipath_compatible_subports(int user_swmajor, int user_swminor)
1466{
1467 /* this code is written long-hand for clarity */
1468 if (IPATH_USER_SWMAJOR != user_swmajor) {
1469 /* no promise of compatibility if major mismatch */
1470 return 0;
1471 }
1472 if (IPATH_USER_SWMAJOR == 1) {
1473 switch (IPATH_USER_SWMINOR) {
1474 case 0:
1475 case 1:
1476 case 2:
1477 /* no subport implementation so cannot be compatible */
1478 return 0;
1479 case 3:
1480 /* 3 is only compatible with itself */
1481 return user_swminor == 3;
1482 default:
1483 /* >= 4 are compatible (or are expected to be) */
1484 return user_swminor >= 4;
1485 }
1486 }
1487 /* make no promises yet for future major versions */
1488 return 0;
1489}
1490
1491static int init_subports(struct ipath_devdata *dd,
1492 struct ipath_portdata *pd,
1493 const struct ipath_user_info *uinfo)
1494{
1495 int ret = 0;
1496 unsigned num_subports;
1497 size_t size;
1498
1499 /*
1500 * If the user is requesting zero subports,
1501 * skip the subport allocation.
1502 */
1503 if (uinfo->spu_subport_cnt <= 0)
1504 goto bail;
1505
1506 /* Self-consistency check for ipath_compatible_subports() */
1507 if (ipath_supports_subports(IPATH_USER_SWMAJOR, IPATH_USER_SWMINOR) &&
1508 !ipath_compatible_subports(IPATH_USER_SWMAJOR,
1509 IPATH_USER_SWMINOR)) {
1510 dev_info(&dd->pcidev->dev,
1511 "Inconsistent ipath_compatible_subports()\n");
1512 goto bail;
1513 }
1514
1515 /* Check for subport compatibility */
1516 if (!ipath_compatible_subports(uinfo->spu_userversion >> 16,
1517 uinfo->spu_userversion & 0xffff)) {
1518 dev_info(&dd->pcidev->dev,
1519 "Mismatched user version (%d.%d) and driver "
1520 "version (%d.%d) while port sharing. Ensure "
1521 "that driver and library are from the same "
1522 "release.\n",
1523 (int) (uinfo->spu_userversion >> 16),
1524 (int) (uinfo->spu_userversion & 0xffff),
1525 IPATH_USER_SWMAJOR,
1526 IPATH_USER_SWMINOR);
1527 goto bail;
1528 }
1529 if (uinfo->spu_subport_cnt > INFINIPATH_MAX_SUBPORT) {
1530 ret = -EINVAL;
1531 goto bail;
1532 }
1533
1534 num_subports = uinfo->spu_subport_cnt;
1535 pd->subport_uregbase = vzalloc(PAGE_SIZE * num_subports);
1536 if (!pd->subport_uregbase) {
1537 ret = -ENOMEM;
1538 goto bail;
1539 }
1540 /* Note: pd->port_rcvhdrq_size isn't initialized yet. */
1541 size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
1542 sizeof(u32), PAGE_SIZE) * num_subports;
1543 pd->subport_rcvhdr_base = vzalloc(size);
1544 if (!pd->subport_rcvhdr_base) {
1545 ret = -ENOMEM;
1546 goto bail_ureg;
1547 }
1548
1549 pd->subport_rcvegrbuf = vzalloc(pd->port_rcvegrbuf_chunks *
1550 pd->port_rcvegrbuf_size *
1551 num_subports);
1552 if (!pd->subport_rcvegrbuf) {
1553 ret = -ENOMEM;
1554 goto bail_rhdr;
1555 }
1556
1557 pd->port_subport_cnt = uinfo->spu_subport_cnt;
1558 pd->port_subport_id = uinfo->spu_subport_id;
1559 pd->active_slaves = 1;
1560 set_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1561 goto bail;
1562
1563bail_rhdr:
1564 vfree(pd->subport_rcvhdr_base);
1565bail_ureg:
1566 vfree(pd->subport_uregbase);
1567 pd->subport_uregbase = NULL;
1568bail:
1569 return ret;
1570}
1571
1572static int try_alloc_port(struct ipath_devdata *dd, int port,
1573 struct file *fp,
1574 const struct ipath_user_info *uinfo)
1575{
1576 struct ipath_portdata *pd;
1577 int ret;
1578
1579 if (!(pd = dd->ipath_pd[port])) {
1580 void *ptmp;
1581
1582 pd = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);
1583
1584 /*
1585 * Allocate memory for use in ipath_tid_update() just once
1586 * at open, not per call. Reduces cost of expected send
1587 * setup.
1588 */
1589 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
1590 dd->ipath_rcvtidcnt * sizeof(struct page **),
1591 GFP_KERNEL);
1592 if (!pd || !ptmp) {
1593 ipath_dev_err(dd, "Unable to allocate portdata "
1594 "memory, failing open\n");
1595 ret = -ENOMEM;
1596 kfree(pd);
1597 kfree(ptmp);
1598 goto bail;
1599 }
1600 dd->ipath_pd[port] = pd;
1601 dd->ipath_pd[port]->port_port = port;
1602 dd->ipath_pd[port]->port_dd = dd;
1603 dd->ipath_pd[port]->port_tid_pg_list = ptmp;
1604 init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
1605 }
1606 if (!pd->port_cnt) {
1607 pd->userversion = uinfo->spu_userversion;
1608 init_user_egr_sizes(pd);
1609 if ((ret = init_subports(dd, pd, uinfo)) != 0)
1610 goto bail;
1611 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
1612 current->comm, current->pid, dd->ipath_unit,
1613 port);
1614 pd->port_cnt = 1;
1615 port_fp(fp) = pd;
1616 pd->port_pid = get_pid(task_pid(current));
1617 strlcpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
1618 ipath_stats.sps_ports++;
1619 ret = 0;
1620 } else
1621 ret = -EBUSY;
1622
1623bail:
1624 return ret;
1625}
1626
1627static inline int usable(struct ipath_devdata *dd)
1628{
1629 return dd &&
1630 (dd->ipath_flags & IPATH_PRESENT) &&
1631 dd->ipath_kregbase &&
1632 dd->ipath_lid &&
1633 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
1634 | IPATH_LINKUNK));
1635}
1636
1637static int find_free_port(int unit, struct file *fp,
1638 const struct ipath_user_info *uinfo)
1639{
1640 struct ipath_devdata *dd = ipath_lookup(unit);
1641 int ret, i;
1642
1643 if (!dd) {
1644 ret = -ENODEV;
1645 goto bail;
1646 }
1647
1648 if (!usable(dd)) {
1649 ret = -ENETDOWN;
1650 goto bail;
1651 }
1652
1653 for (i = 1; i < dd->ipath_cfgports; i++) {
1654 ret = try_alloc_port(dd, i, fp, uinfo);
1655 if (ret != -EBUSY)
1656 goto bail;
1657 }
1658 ret = -EBUSY;
1659
1660bail:
1661 return ret;
1662}
1663
1664static int find_best_unit(struct file *fp,
1665 const struct ipath_user_info *uinfo)
1666{
1667 int ret = 0, i, prefunit = -1, devmax;
1668 int maxofallports, npresent, nup;
1669 int ndev;
1670
1671 devmax = ipath_count_units(&npresent, &nup, &maxofallports);
1672
1673 /*
1674 * This code is present to allow a knowledgeable person to
1675 * specify the layout of processes to processors before opening
1676 * this driver, and then we'll assign the process to the "closest"
1677 * InfiniPath chip to that processor (we assume reasonable connectivity,
1678 * for now). This code assumes that if affinity has been set
1679 * before this point, that at most one cpu is set; for now this
1680 * is reasonable. I check for both cpumask_empty() and cpumask_full(),
1681 * in case some kernel variant sets none of the bits when no
1682 * affinity is set. 2.6.11 and 12 kernels have all present
1683 * cpus set. Some day we'll have to fix it up further to handle
1684 * a cpu subset. This algorithm fails for two HT chips connected
1685 * in tunnel fashion. Eventually this needs real topology
1686 * information. There may be some issues with dual core numbering
1687 * as well. This needs more work prior to release.
1688 */
1689 if (!cpumask_empty(tsk_cpus_allowed(current)) &&
1690 !cpumask_full(tsk_cpus_allowed(current))) {
1691 int ncpus = num_online_cpus(), curcpu = -1, nset = 0;
1692 get_online_cpus();
1693 for_each_online_cpu(i)
1694 if (cpumask_test_cpu(i, tsk_cpus_allowed(current))) {
1695 ipath_cdbg(PROC, "%s[%u] affinity set for "
1696 "cpu %d/%d\n", current->comm,
1697 current->pid, i, ncpus);
1698 curcpu = i;
1699 nset++;
1700 }
1701 put_online_cpus();
1702 if (curcpu != -1 && nset != ncpus) {
1703 if (npresent) {
1704 prefunit = curcpu / (ncpus / npresent);
1705 ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, "
1706 "%d cpus/chip, select unit %d\n",
1707 current->comm, current->pid,
1708 npresent, ncpus, ncpus / npresent,
1709 prefunit);
1710 }
1711 }
1712 }
1713
1714 /*
1715 * user ports start at 1, kernel port is 0
1716 * For now, we do round-robin access across all chips
1717 */
1718
1719 if (prefunit != -1)
1720 devmax = prefunit + 1;
1721recheck:
1722 for (i = 1; i < maxofallports; i++) {
1723 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
1724 ndev++) {
1725 struct ipath_devdata *dd = ipath_lookup(ndev);
1726
1727 if (!usable(dd))
1728 continue; /* can't use this unit */
1729 if (i >= dd->ipath_cfgports)
1730 /*
1731 * Maxed out on users of this unit. Try
1732 * next.
1733 */
1734 continue;
1735 ret = try_alloc_port(dd, i, fp, uinfo);
1736 if (!ret)
1737 goto done;
1738 }
1739 }
1740
1741 if (npresent) {
1742 if (nup == 0) {
1743 ret = -ENETDOWN;
1744 ipath_dbg("No ports available (none initialized "
1745 "and ready)\n");
1746 } else {
1747 if (prefunit > 0) {
1748 /* if started above 0, retry from 0 */
1749 ipath_cdbg(PROC,
1750 "%s[%u] no ports on prefunit "
1751 "%d, clear and re-check\n",
1752 current->comm, current->pid,
1753 prefunit);
1754 devmax = ipath_count_units(NULL, NULL,
1755 NULL);
1756 prefunit = -1;
1757 goto recheck;
1758 }
1759 ret = -EBUSY;
1760 ipath_dbg("No ports available\n");
1761 }
1762 } else {
1763 ret = -ENXIO;
1764 ipath_dbg("No boards found\n");
1765 }
1766
1767done:
1768 return ret;
1769}
1770
1771static int find_shared_port(struct file *fp,
1772 const struct ipath_user_info *uinfo)
1773{
1774 int devmax, ndev, i;
1775 int ret = 0;
1776
1777 devmax = ipath_count_units(NULL, NULL, NULL);
1778
1779 for (ndev = 0; ndev < devmax; ndev++) {
1780 struct ipath_devdata *dd = ipath_lookup(ndev);
1781
1782 if (!usable(dd))
1783 continue;
1784 for (i = 1; i < dd->ipath_cfgports; i++) {
1785 struct ipath_portdata *pd = dd->ipath_pd[i];
1786
1787 /* Skip ports which are not yet open */
1788 if (!pd || !pd->port_cnt)
1789 continue;
1790 /* Skip port if it doesn't match the requested one */
1791 if (pd->port_subport_id != uinfo->spu_subport_id)
1792 continue;
1793 /* Verify the sharing process matches the master */
1794 if (pd->port_subport_cnt != uinfo->spu_subport_cnt ||
1795 pd->userversion != uinfo->spu_userversion ||
1796 pd->port_cnt >= pd->port_subport_cnt) {
1797 ret = -EINVAL;
1798 goto done;
1799 }
1800 port_fp(fp) = pd;
1801 subport_fp(fp) = pd->port_cnt++;
1802 pd->port_subpid[subport_fp(fp)] =
1803 get_pid(task_pid(current));
1804 tidcursor_fp(fp) = 0;
1805 pd->active_slaves |= 1 << subport_fp(fp);
1806 ipath_cdbg(PROC,
1807 "%s[%u] %u sharing %s[%u] unit:port %u:%u\n",
1808 current->comm, current->pid,
1809 subport_fp(fp),
1810 pd->port_comm, pid_nr(pd->port_pid),
1811 dd->ipath_unit, pd->port_port);
1812 ret = 1;
1813 goto done;
1814 }
1815 }
1816
1817done:
1818 return ret;
1819}
1820
1821static int ipath_open(struct inode *in, struct file *fp)
1822{
1823 /* The real work is performed later in ipath_assign_port() */
1824 fp->private_data = kzalloc(sizeof(struct ipath_filedata), GFP_KERNEL);
1825 return fp->private_data ? 0 : -ENOMEM;
1826}
1827
1828/* Get port early, so can set affinity prior to memory allocation */
1829static int ipath_assign_port(struct file *fp,
1830 const struct ipath_user_info *uinfo)
1831{
1832 int ret;
1833 int i_minor;
1834 unsigned swmajor, swminor;
1835
1836 /* Check to be sure we haven't already initialized this file */
1837 if (port_fp(fp)) {
1838 ret = -EINVAL;
1839 goto done;
1840 }
1841
1842 /* for now, if major version is different, bail */
1843 swmajor = uinfo->spu_userversion >> 16;
1844 if (swmajor != IPATH_USER_SWMAJOR) {
1845 ipath_dbg("User major version %d not same as driver "
1846 "major %d\n", uinfo->spu_userversion >> 16,
1847 IPATH_USER_SWMAJOR);
1848 ret = -ENODEV;
1849 goto done;
1850 }
1851
1852 swminor = uinfo->spu_userversion & 0xffff;
1853 if (swminor != IPATH_USER_SWMINOR)
1854 ipath_dbg("User minor version %d not same as driver "
1855 "minor %d\n", swminor, IPATH_USER_SWMINOR);
1856
1857 mutex_lock(&ipath_mutex);
1858
1859 if (ipath_compatible_subports(swmajor, swminor) &&
1860 uinfo->spu_subport_cnt &&
1861 (ret = find_shared_port(fp, uinfo))) {
1862 if (ret > 0)
1863 ret = 0;
1864 goto done_chk_sdma;
1865 }
1866
1867 i_minor = iminor(fp->f_path.dentry->d_inode) - IPATH_USER_MINOR_BASE;
1868 ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
1869 (long)fp->f_path.dentry->d_inode->i_rdev, i_minor);
1870
1871 if (i_minor)
1872 ret = find_free_port(i_minor - 1, fp, uinfo);
1873 else
1874 ret = find_best_unit(fp, uinfo);
1875
1876done_chk_sdma:
1877 if (!ret) {
1878 struct ipath_filedata *fd = fp->private_data;
1879 const struct ipath_portdata *pd = fd->pd;
1880 const struct ipath_devdata *dd = pd->port_dd;
1881
1882 fd->pq = ipath_user_sdma_queue_create(&dd->pcidev->dev,
1883 dd->ipath_unit,
1884 pd->port_port,
1885 fd->subport);
1886
1887 if (!fd->pq)
1888 ret = -ENOMEM;
1889 }
1890
1891 mutex_unlock(&ipath_mutex);
1892
1893done:
1894 return ret;
1895}
1896
1897
1898static int ipath_do_user_init(struct file *fp,
1899 const struct ipath_user_info *uinfo)
1900{
1901 int ret;
1902 struct ipath_portdata *pd = port_fp(fp);
1903 struct ipath_devdata *dd;
1904 u32 head32;
1905
1906 /* Subports don't need to initialize anything since master did it. */
1907 if (subport_fp(fp)) {
1908 ret = wait_event_interruptible(pd->port_wait,
1909 !test_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag));
1910 goto done;
1911 }
1912
1913 dd = pd->port_dd;
1914
1915 if (uinfo->spu_rcvhdrsize) {
1916 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
1917 if (ret)
1918 goto done;
1919 }
1920
1921 /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */
1922
1923 /* some ports may get extra buffers, calculate that here */
1924 if (pd->port_port <= dd->ipath_ports_extrabuf)
1925 pd->port_piocnt = dd->ipath_pbufsport + 1;
1926 else
1927 pd->port_piocnt = dd->ipath_pbufsport;
1928
1929 /* for right now, kernel piobufs are at end, so port 1 is at 0 */
1930 if (pd->port_port <= dd->ipath_ports_extrabuf)
1931 pd->port_pio_base = (dd->ipath_pbufsport + 1)
1932 * (pd->port_port - 1);
1933 else
1934 pd->port_pio_base = dd->ipath_ports_extrabuf +
1935 dd->ipath_pbufsport * (pd->port_port - 1);
1936 pd->port_piobufs = dd->ipath_piobufbase +
1937 pd->port_pio_base * dd->ipath_palign;
1938 ipath_cdbg(VERBOSE, "piobuf base for port %u is 0x%x, piocnt %u,"
1939 " first pio %u\n", pd->port_port, pd->port_piobufs,
1940 pd->port_piocnt, pd->port_pio_base);
1941 ipath_chg_pioavailkernel(dd, pd->port_pio_base, pd->port_piocnt, 0);
1942
1943 /*
1944 * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1945 * array for time being. If pd->port_port > chip-supported,
1946 * we need to do extra stuff here to handle by handling overflow
1947 * through port 0, someday
1948 */
1949 ret = ipath_create_rcvhdrq(dd, pd);
1950 if (!ret)
1951 ret = ipath_create_user_egr(pd);
1952 if (ret)
1953 goto done;
1954
1955 /*
1956 * set the eager head register for this port to the current values
1957 * of the tail pointers, since we don't know if they were
1958 * updated on last use of the port.
1959 */
1960 head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
1961 ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
1962 pd->port_lastrcvhdrqtail = -1;
1963 ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n",
1964 pd->port_port, head32);
1965 pd->port_tidcursor = 0; /* start at beginning after open */
1966
1967 /* initialize poll variables... */
1968 pd->port_urgent = 0;
1969 pd->port_urgent_poll = 0;
1970 pd->port_hdrqfull_poll = pd->port_hdrqfull;
1971
1972 /*
1973 * Now enable the port for receive.
1974 * For chips that are set to DMA the tail register to memory
1975 * when they change (and when the update bit transitions from
1976 * 0 to 1. So for those chips, we turn it off and then back on.
1977 * This will (very briefly) affect any other open ports, but the
1978 * duration is very short, and therefore isn't an issue. We
1979 * explicitly set the in-memory tail copy to 0 beforehand, so we
1980 * don't have to wait to be sure the DMA update has happened
1981 * (chip resets head/tail to 0 on transition to enable).
1982 */
1983 set_bit(dd->ipath_r_portenable_shift + pd->port_port,
1984 &dd->ipath_rcvctrl);
1985 if (!(dd->ipath_flags & IPATH_NODMA_RTAIL)) {
1986 if (pd->port_rcvhdrtail_kvaddr)
1987 ipath_clear_rcvhdrtail(pd);
1988 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1989 dd->ipath_rcvctrl &
1990 ~(1ULL << dd->ipath_r_tailupd_shift));
1991 }
1992 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1993 dd->ipath_rcvctrl);
1994 /* Notify any waiting slaves */
1995 if (pd->port_subport_cnt) {
1996 clear_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
1997 wake_up(&pd->port_wait);
1998 }
1999done:
2000 return ret;
2001}
2002
2003/**
2004 * unlock_exptid - unlock any expected TID entries port still had in use
2005 * @pd: port
2006 *
2007 * We don't actually update the chip here, because we do a bulk update
2008 * below, using ipath_f_clear_tids.
2009 */
2010static void unlock_expected_tids(struct ipath_portdata *pd)
2011{
2012 struct ipath_devdata *dd = pd->port_dd;
2013 int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
2014 int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;
2015
2016 ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
2017 pd->port_port);
2018 for (i = port_tidbase; i < maxtid; i++) {
2019 struct page *ps = dd->ipath_pageshadow[i];
2020
2021 if (!ps)
2022 continue;
2023
2024 dd->ipath_pageshadow[i] = NULL;
2025 pci_unmap_page(dd->pcidev, dd->ipath_physshadow[i],
2026 PAGE_SIZE, PCI_DMA_FROMDEVICE);
2027 ipath_release_user_pages_on_close(&ps, 1);
2028 cnt++;
2029 ipath_stats.sps_pageunlocks++;
2030 }
2031 if (cnt)
2032 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
2033 pd->port_port, cnt);
2034
2035 if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
2036 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
2037 (unsigned long long) ipath_stats.sps_pagelocks,
2038 (unsigned long long)
2039 ipath_stats.sps_pageunlocks);
2040}
2041
2042static int ipath_close(struct inode *in, struct file *fp)
2043{
2044 int ret = 0;
2045 struct ipath_filedata *fd;
2046 struct ipath_portdata *pd;
2047 struct ipath_devdata *dd;
2048 unsigned long flags;
2049 unsigned port;
2050 struct pid *pid;
2051
2052 ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
2053 (long)in->i_rdev, fp->private_data);
2054
2055 mutex_lock(&ipath_mutex);
2056
2057 fd = fp->private_data;
2058 fp->private_data = NULL;
2059 pd = fd->pd;
2060 if (!pd) {
2061 mutex_unlock(&ipath_mutex);
2062 goto bail;
2063 }
2064
2065 dd = pd->port_dd;
2066
2067 /* drain user sdma queue */
2068 ipath_user_sdma_queue_drain(dd, fd->pq);
2069 ipath_user_sdma_queue_destroy(fd->pq);
2070
2071 if (--pd->port_cnt) {
2072 /*
2073 * XXX If the master closes the port before the slave(s),
2074 * revoke the mmap for the eager receive queue so
2075 * the slave(s) don't wait for receive data forever.
2076 */
2077 pd->active_slaves &= ~(1 << fd->subport);
2078 put_pid(pd->port_subpid[fd->subport]);
2079 pd->port_subpid[fd->subport] = NULL;
2080 mutex_unlock(&ipath_mutex);
2081 goto bail;
2082 }
2083 /* early; no interrupt users after this */
2084 spin_lock_irqsave(&dd->ipath_uctxt_lock, flags);
2085 port = pd->port_port;
2086 dd->ipath_pd[port] = NULL;
2087 pid = pd->port_pid;
2088 pd->port_pid = NULL;
2089 spin_unlock_irqrestore(&dd->ipath_uctxt_lock, flags);
2090
2091 if (pd->port_rcvwait_to || pd->port_piowait_to
2092 || pd->port_rcvnowait || pd->port_pionowait) {
2093 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
2094 "%u rcv %u, pio already\n",
2095 pd->port_port, pd->port_rcvwait_to,
2096 pd->port_piowait_to, pd->port_rcvnowait,
2097 pd->port_pionowait);
2098 pd->port_rcvwait_to = pd->port_piowait_to =
2099 pd->port_rcvnowait = pd->port_pionowait = 0;
2100 }
2101 if (pd->port_flag) {
2102 ipath_cdbg(PROC, "port %u port_flag set: 0x%lx\n",
2103 pd->port_port, pd->port_flag);
2104 pd->port_flag = 0;
2105 }
2106
2107 if (dd->ipath_kregbase) {
2108 /* atomically clear receive enable port and intr avail. */
2109 clear_bit(dd->ipath_r_portenable_shift + port,
2110 &dd->ipath_rcvctrl);
2111 clear_bit(pd->port_port + dd->ipath_r_intravail_shift,
2112 &dd->ipath_rcvctrl);
2113 ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
2114 dd->ipath_rcvctrl);
2115 /* and read back from chip to be sure that nothing
2116 * else is in flight when we do the rest */
2117 (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
2118
2119 /* clean up the pkeys for this port user */
2120 ipath_clean_part_key(pd, dd);
2121 /*
2122 * be paranoid, and never write 0's to these, just use an
2123 * unused part of the port 0 tail page. Of course,
2124 * rcvhdraddr points to a large chunk of memory, so this
2125 * could still trash things, but at least it won't trash
2126 * page 0, and by disabling the port, it should stop "soon",
2127 * even if a packet or two is in already in flight after we
2128 * disabled the port.
2129 */
2130 ipath_write_kreg_port(dd,
2131 dd->ipath_kregs->kr_rcvhdrtailaddr, port,
2132 dd->ipath_dummy_hdrq_phys);
2133 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
2134 pd->port_port, dd->ipath_dummy_hdrq_phys);
2135
2136 ipath_disarm_piobufs(dd, pd->port_pio_base, pd->port_piocnt);
2137 ipath_chg_pioavailkernel(dd, pd->port_pio_base,
2138 pd->port_piocnt, 1);
2139
2140 dd->ipath_f_clear_tids(dd, pd->port_port);
2141
2142 if (dd->ipath_pageshadow)
2143 unlock_expected_tids(pd);
2144 ipath_stats.sps_ports--;
2145 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
2146 pd->port_comm, pid_nr(pid),
2147 dd->ipath_unit, port);
2148 }
2149
2150 put_pid(pid);
2151 mutex_unlock(&ipath_mutex);
2152 ipath_free_pddata(dd, pd); /* after releasing the mutex */
2153
2154bail:
2155 kfree(fd);
2156 return ret;
2157}
2158
2159static int ipath_port_info(struct ipath_portdata *pd, u16 subport,
2160 struct ipath_port_info __user *uinfo)
2161{
2162 struct ipath_port_info info;
2163 int nup;
2164 int ret;
2165 size_t sz;
2166
2167 (void) ipath_count_units(NULL, &nup, NULL);
2168 info.num_active = nup;
2169 info.unit = pd->port_dd->ipath_unit;
2170 info.port = pd->port_port;
2171 info.subport = subport;
2172 /* Don't return new fields if old library opened the port. */
2173 if (ipath_supports_subports(pd->userversion >> 16,
2174 pd->userversion & 0xffff)) {
2175 /* Number of user ports available for this device. */
2176 info.num_ports = pd->port_dd->ipath_cfgports - 1;
2177 info.num_subports = pd->port_subport_cnt;
2178 sz = sizeof(info);
2179 } else
2180 sz = sizeof(info) - 2 * sizeof(u16);
2181
2182 if (copy_to_user(uinfo, &info, sz)) {
2183 ret = -EFAULT;
2184 goto bail;
2185 }
2186 ret = 0;
2187
2188bail:
2189 return ret;
2190}
2191
2192static int ipath_get_slave_info(struct ipath_portdata *pd,
2193 void __user *slave_mask_addr)
2194{
2195 int ret = 0;
2196
2197 if (copy_to_user(slave_mask_addr, &pd->active_slaves, sizeof(u32)))
2198 ret = -EFAULT;
2199 return ret;
2200}
2201
2202static int ipath_sdma_get_inflight(struct ipath_user_sdma_queue *pq,
2203 u32 __user *inflightp)
2204{
2205 const u32 val = ipath_user_sdma_inflight_counter(pq);
2206
2207 if (put_user(val, inflightp))
2208 return -EFAULT;
2209
2210 return 0;
2211}
2212
2213static int ipath_sdma_get_complete(struct ipath_devdata *dd,
2214 struct ipath_user_sdma_queue *pq,
2215 u32 __user *completep)
2216{
2217 u32 val;
2218 int err;
2219
2220 err = ipath_user_sdma_make_progress(dd, pq);
2221 if (err < 0)
2222 return err;
2223
2224 val = ipath_user_sdma_complete_counter(pq);
2225 if (put_user(val, completep))
2226 return -EFAULT;
2227
2228 return 0;
2229}
2230
2231static ssize_t ipath_write(struct file *fp, const char __user *data,
2232 size_t count, loff_t *off)
2233{
2234 const struct ipath_cmd __user *ucmd;
2235 struct ipath_portdata *pd;
2236 const void __user *src;
2237 size_t consumed, copy;
2238 struct ipath_cmd cmd;
2239 ssize_t ret = 0;
2240 void *dest;
2241
2242 if (count < sizeof(cmd.type)) {
2243 ret = -EINVAL;
2244 goto bail;
2245 }
2246
2247 ucmd = (const struct ipath_cmd __user *) data;
2248
2249 if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
2250 ret = -EFAULT;
2251 goto bail;
2252 }
2253
2254 consumed = sizeof(cmd.type);
2255
2256 switch (cmd.type) {
2257 case IPATH_CMD_ASSIGN_PORT:
2258 case __IPATH_CMD_USER_INIT:
2259 case IPATH_CMD_USER_INIT:
2260 copy = sizeof(cmd.cmd.user_info);
2261 dest = &cmd.cmd.user_info;
2262 src = &ucmd->cmd.user_info;
2263 break;
2264 case IPATH_CMD_RECV_CTRL:
2265 copy = sizeof(cmd.cmd.recv_ctrl);
2266 dest = &cmd.cmd.recv_ctrl;
2267 src = &ucmd->cmd.recv_ctrl;
2268 break;
2269 case IPATH_CMD_PORT_INFO:
2270 copy = sizeof(cmd.cmd.port_info);
2271 dest = &cmd.cmd.port_info;
2272 src = &ucmd->cmd.port_info;
2273 break;
2274 case IPATH_CMD_TID_UPDATE:
2275 case IPATH_CMD_TID_FREE:
2276 copy = sizeof(cmd.cmd.tid_info);
2277 dest = &cmd.cmd.tid_info;
2278 src = &ucmd->cmd.tid_info;
2279 break;
2280 case IPATH_CMD_SET_PART_KEY:
2281 copy = sizeof(cmd.cmd.part_key);
2282 dest = &cmd.cmd.part_key;
2283 src = &ucmd->cmd.part_key;
2284 break;
2285 case __IPATH_CMD_SLAVE_INFO:
2286 copy = sizeof(cmd.cmd.slave_mask_addr);
2287 dest = &cmd.cmd.slave_mask_addr;
2288 src = &ucmd->cmd.slave_mask_addr;
2289 break;
2290 case IPATH_CMD_PIOAVAILUPD: // force an update of PIOAvail reg
2291 copy = 0;
2292 src = NULL;
2293 dest = NULL;
2294 break;
2295 case IPATH_CMD_POLL_TYPE:
2296 copy = sizeof(cmd.cmd.poll_type);
2297 dest = &cmd.cmd.poll_type;
2298 src = &ucmd->cmd.poll_type;
2299 break;
2300 case IPATH_CMD_ARMLAUNCH_CTRL:
2301 copy = sizeof(cmd.cmd.armlaunch_ctrl);
2302 dest = &cmd.cmd.armlaunch_ctrl;
2303 src = &ucmd->cmd.armlaunch_ctrl;
2304 break;
2305 case IPATH_CMD_SDMA_INFLIGHT:
2306 copy = sizeof(cmd.cmd.sdma_inflight);
2307 dest = &cmd.cmd.sdma_inflight;
2308 src = &ucmd->cmd.sdma_inflight;
2309 break;
2310 case IPATH_CMD_SDMA_COMPLETE:
2311 copy = sizeof(cmd.cmd.sdma_complete);
2312 dest = &cmd.cmd.sdma_complete;
2313 src = &ucmd->cmd.sdma_complete;
2314 break;
2315 default:
2316 ret = -EINVAL;
2317 goto bail;
2318 }
2319
2320 if (copy) {
2321 if ((count - consumed) < copy) {
2322 ret = -EINVAL;
2323 goto bail;
2324 }
2325
2326 if (copy_from_user(dest, src, copy)) {
2327 ret = -EFAULT;
2328 goto bail;
2329 }
2330
2331 consumed += copy;
2332 }
2333
2334 pd = port_fp(fp);
2335 if (!pd && cmd.type != __IPATH_CMD_USER_INIT &&
2336 cmd.type != IPATH_CMD_ASSIGN_PORT) {
2337 ret = -EINVAL;
2338 goto bail;
2339 }
2340
2341 switch (cmd.type) {
2342 case IPATH_CMD_ASSIGN_PORT:
2343 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2344 if (ret)
2345 goto bail;
2346 break;
2347 case __IPATH_CMD_USER_INIT:
2348 /* backwards compatibility, get port first */
2349 ret = ipath_assign_port(fp, &cmd.cmd.user_info);
2350 if (ret)
2351 goto bail;
2352 /* and fall through to current version. */
2353 case IPATH_CMD_USER_INIT:
2354 ret = ipath_do_user_init(fp, &cmd.cmd.user_info);
2355 if (ret)
2356 goto bail;
2357 ret = ipath_get_base_info(
2358 fp, (void __user *) (unsigned long)
2359 cmd.cmd.user_info.spu_base_info,
2360 cmd.cmd.user_info.spu_base_info_size);
2361 break;
2362 case IPATH_CMD_RECV_CTRL:
2363 ret = ipath_manage_rcvq(pd, subport_fp(fp), cmd.cmd.recv_ctrl);
2364 break;
2365 case IPATH_CMD_PORT_INFO:
2366 ret = ipath_port_info(pd, subport_fp(fp),
2367 (struct ipath_port_info __user *)
2368 (unsigned long) cmd.cmd.port_info);
2369 break;
2370 case IPATH_CMD_TID_UPDATE:
2371 ret = ipath_tid_update(pd, fp, &cmd.cmd.tid_info);
2372 break;
2373 case IPATH_CMD_TID_FREE:
2374 ret = ipath_tid_free(pd, subport_fp(fp), &cmd.cmd.tid_info);
2375 break;
2376 case IPATH_CMD_SET_PART_KEY:
2377 ret = ipath_set_part_key(pd, cmd.cmd.part_key);
2378 break;
2379 case __IPATH_CMD_SLAVE_INFO:
2380 ret = ipath_get_slave_info(pd,
2381 (void __user *) (unsigned long)
2382 cmd.cmd.slave_mask_addr);
2383 break;
2384 case IPATH_CMD_PIOAVAILUPD:
2385 ipath_force_pio_avail_update(pd->port_dd);
2386 break;
2387 case IPATH_CMD_POLL_TYPE:
2388 pd->poll_type = cmd.cmd.poll_type;
2389 break;
2390 case IPATH_CMD_ARMLAUNCH_CTRL:
2391 if (cmd.cmd.armlaunch_ctrl)
2392 ipath_enable_armlaunch(pd->port_dd);
2393 else
2394 ipath_disable_armlaunch(pd->port_dd);
2395 break;
2396 case IPATH_CMD_SDMA_INFLIGHT:
2397 ret = ipath_sdma_get_inflight(user_sdma_queue_fp(fp),
2398 (u32 __user *) (unsigned long)
2399 cmd.cmd.sdma_inflight);
2400 break;
2401 case IPATH_CMD_SDMA_COMPLETE:
2402 ret = ipath_sdma_get_complete(pd->port_dd,
2403 user_sdma_queue_fp(fp),
2404 (u32 __user *) (unsigned long)
2405 cmd.cmd.sdma_complete);
2406 break;
2407 }
2408
2409 if (ret >= 0)
2410 ret = consumed;
2411
2412bail:
2413 return ret;
2414}
2415
2416static ssize_t ipath_writev(struct kiocb *iocb, const struct iovec *iov,
2417 unsigned long dim, loff_t off)
2418{
2419 struct file *filp = iocb->ki_filp;
2420 struct ipath_filedata *fp = filp->private_data;
2421 struct ipath_portdata *pd = port_fp(filp);
2422 struct ipath_user_sdma_queue *pq = fp->pq;
2423
2424 if (!dim)
2425 return -EINVAL;
2426
2427 return ipath_user_sdma_writev(pd->port_dd, pq, iov, dim);
2428}
2429
2430static struct class *ipath_class;
2431
2432static int init_cdev(int minor, char *name, const struct file_operations *fops,
2433 struct cdev **cdevp, struct device **devp)
2434{
2435 const dev_t dev = MKDEV(IPATH_MAJOR, minor);
2436 struct cdev *cdev = NULL;
2437 struct device *device = NULL;
2438 int ret;
2439
2440 cdev = cdev_alloc();
2441 if (!cdev) {
2442 printk(KERN_ERR IPATH_DRV_NAME
2443 ": Could not allocate cdev for minor %d, %s\n",
2444 minor, name);
2445 ret = -ENOMEM;
2446 goto done;
2447 }
2448
2449 cdev->owner = THIS_MODULE;
2450 cdev->ops = fops;
2451 kobject_set_name(&cdev->kobj, name);
2452
2453 ret = cdev_add(cdev, dev, 1);
2454 if (ret < 0) {
2455 printk(KERN_ERR IPATH_DRV_NAME
2456 ": Could not add cdev for minor %d, %s (err %d)\n",
2457 minor, name, -ret);
2458 goto err_cdev;
2459 }
2460
2461 device = device_create(ipath_class, NULL, dev, NULL, name);
2462
2463 if (IS_ERR(device)) {
2464 ret = PTR_ERR(device);
2465 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2466 "device for minor %d, %s (err %d)\n",
2467 minor, name, -ret);
2468 goto err_cdev;
2469 }
2470
2471 goto done;
2472
2473err_cdev:
2474 cdev_del(cdev);
2475 cdev = NULL;
2476
2477done:
2478 if (ret >= 0) {
2479 *cdevp = cdev;
2480 *devp = device;
2481 } else {
2482 *cdevp = NULL;
2483 *devp = NULL;
2484 }
2485
2486 return ret;
2487}
2488
2489int ipath_cdev_init(int minor, char *name, const struct file_operations *fops,
2490 struct cdev **cdevp, struct device **devp)
2491{
2492 return init_cdev(minor, name, fops, cdevp, devp);
2493}
2494
2495static void cleanup_cdev(struct cdev **cdevp,
2496 struct device **devp)
2497{
2498 struct device *dev = *devp;
2499
2500 if (dev) {
2501 device_unregister(dev);
2502 *devp = NULL;
2503 }
2504
2505 if (*cdevp) {
2506 cdev_del(*cdevp);
2507 *cdevp = NULL;
2508 }
2509}
2510
2511void ipath_cdev_cleanup(struct cdev **cdevp,
2512 struct device **devp)
2513{
2514 cleanup_cdev(cdevp, devp);
2515}
2516
2517static struct cdev *wildcard_cdev;
2518static struct device *wildcard_dev;
2519
2520static const dev_t dev = MKDEV(IPATH_MAJOR, 0);
2521
2522static int user_init(void)
2523{
2524 int ret;
2525
2526 ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
2527 if (ret < 0) {
2528 printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
2529 "chrdev region (err %d)\n", -ret);
2530 goto done;
2531 }
2532
2533 ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);
2534
2535 if (IS_ERR(ipath_class)) {
2536 ret = PTR_ERR(ipath_class);
2537 printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
2538 "device class (err %d)\n", -ret);
2539 goto bail;
2540 }
2541
2542 goto done;
2543bail:
2544 unregister_chrdev_region(dev, IPATH_NMINORS);
2545done:
2546 return ret;
2547}
2548
2549static void user_cleanup(void)
2550{
2551 if (ipath_class) {
2552 class_destroy(ipath_class);
2553 ipath_class = NULL;
2554 }
2555
2556 unregister_chrdev_region(dev, IPATH_NMINORS);
2557}
2558
2559static atomic_t user_count = ATOMIC_INIT(0);
2560static atomic_t user_setup = ATOMIC_INIT(0);
2561
2562int ipath_user_add(struct ipath_devdata *dd)
2563{
2564 char name[10];
2565 int ret;
2566
2567 if (atomic_inc_return(&user_count) == 1) {
2568 ret = user_init();
2569 if (ret < 0) {
2570 ipath_dev_err(dd, "Unable to set up user support: "
2571 "error %d\n", -ret);
2572 goto bail;
2573 }
2574 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
2575 &wildcard_dev);
2576 if (ret < 0) {
2577 ipath_dev_err(dd, "Could not create wildcard "
2578 "minor: error %d\n", -ret);
2579 goto bail_user;
2580 }
2581
2582 atomic_set(&user_setup, 1);
2583 }
2584
2585 snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
2586
2587 ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
2588 &dd->user_cdev, &dd->user_dev);
2589 if (ret < 0)
2590 ipath_dev_err(dd, "Could not create user minor %d, %s\n",
2591 dd->ipath_unit + 1, name);
2592
2593 goto bail;
2594
2595bail_user:
2596 user_cleanup();
2597bail:
2598 return ret;
2599}
2600
2601void ipath_user_remove(struct ipath_devdata *dd)
2602{
2603 cleanup_cdev(&dd->user_cdev, &dd->user_dev);
2604
2605 if (atomic_dec_return(&user_count) == 0) {
2606 if (atomic_read(&user_setup) == 0)
2607 goto bail;
2608
2609 cleanup_cdev(&wildcard_cdev, &wildcard_dev);
2610 user_cleanup();
2611
2612 atomic_set(&user_setup, 0);
2613 }
2614bail:
2615 return;
2616}