net: move procfs code to net/core/net-procfs.c
[linux/fpc-iii.git] / drivers / infiniband / hw / qib / qib_mr.c
blobe6687ded821016e9fb5bdc36473376b9ec9304b9
1 /*
2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
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.
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.
34 #include <rdma/ib_umem.h>
35 #include <rdma/ib_smi.h>
37 #include "qib.h"
39 /* Fast memory region */
40 struct qib_fmr {
41 struct ib_fmr ibfmr;
42 struct qib_mregion mr; /* must be last */
45 static inline struct qib_fmr *to_ifmr(struct ib_fmr *ibfmr)
47 return container_of(ibfmr, struct qib_fmr, ibfmr);
50 static int init_qib_mregion(struct qib_mregion *mr, struct ib_pd *pd,
51 int count)
53 int m, i = 0;
54 int rval = 0;
56 m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
57 for (; i < m; i++) {
58 mr->map[i] = kzalloc(sizeof *mr->map[0], GFP_KERNEL);
59 if (!mr->map[i])
60 goto bail;
62 mr->mapsz = m;
63 init_completion(&mr->comp);
64 /* count returning the ptr to user */
65 atomic_set(&mr->refcount, 1);
66 mr->pd = pd;
67 mr->max_segs = count;
68 out:
69 return rval;
70 bail:
71 while (i)
72 kfree(mr->map[--i]);
73 rval = -ENOMEM;
74 goto out;
77 static void deinit_qib_mregion(struct qib_mregion *mr)
79 int i = mr->mapsz;
81 mr->mapsz = 0;
82 while (i)
83 kfree(mr->map[--i]);
87 /**
88 * qib_get_dma_mr - get a DMA memory region
89 * @pd: protection domain for this memory region
90 * @acc: access flags
92 * Returns the memory region on success, otherwise returns an errno.
93 * Note that all DMA addresses should be created via the
94 * struct ib_dma_mapping_ops functions (see qib_dma.c).
96 struct ib_mr *qib_get_dma_mr(struct ib_pd *pd, int acc)
98 struct qib_mr *mr = NULL;
99 struct ib_mr *ret;
100 int rval;
102 if (to_ipd(pd)->user) {
103 ret = ERR_PTR(-EPERM);
104 goto bail;
107 mr = kzalloc(sizeof *mr, GFP_KERNEL);
108 if (!mr) {
109 ret = ERR_PTR(-ENOMEM);
110 goto bail;
113 rval = init_qib_mregion(&mr->mr, pd, 0);
114 if (rval) {
115 ret = ERR_PTR(rval);
116 goto bail;
120 rval = qib_alloc_lkey(&mr->mr, 1);
121 if (rval) {
122 ret = ERR_PTR(rval);
123 goto bail_mregion;
126 mr->mr.access_flags = acc;
127 ret = &mr->ibmr;
128 done:
129 return ret;
131 bail_mregion:
132 deinit_qib_mregion(&mr->mr);
133 bail:
134 kfree(mr);
135 goto done;
138 static struct qib_mr *alloc_mr(int count, struct ib_pd *pd)
140 struct qib_mr *mr;
141 int rval = -ENOMEM;
142 int m;
144 /* Allocate struct plus pointers to first level page tables. */
145 m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
146 mr = kzalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
147 if (!mr)
148 goto bail;
150 rval = init_qib_mregion(&mr->mr, pd, count);
151 if (rval)
152 goto bail;
154 * ib_reg_phys_mr() will initialize mr->ibmr except for
155 * lkey and rkey.
157 rval = qib_alloc_lkey(&mr->mr, 0);
158 if (rval)
159 goto bail_mregion;
160 mr->ibmr.lkey = mr->mr.lkey;
161 mr->ibmr.rkey = mr->mr.lkey;
162 done:
163 return mr;
165 bail_mregion:
166 deinit_qib_mregion(&mr->mr);
167 bail:
168 kfree(mr);
169 mr = ERR_PTR(rval);
170 goto done;
174 * qib_reg_phys_mr - register a physical memory region
175 * @pd: protection domain for this memory region
176 * @buffer_list: pointer to the list of physical buffers to register
177 * @num_phys_buf: the number of physical buffers to register
178 * @iova_start: the starting address passed over IB which maps to this MR
180 * Returns the memory region on success, otherwise returns an errno.
182 struct ib_mr *qib_reg_phys_mr(struct ib_pd *pd,
183 struct ib_phys_buf *buffer_list,
184 int num_phys_buf, int acc, u64 *iova_start)
186 struct qib_mr *mr;
187 int n, m, i;
188 struct ib_mr *ret;
190 mr = alloc_mr(num_phys_buf, pd);
191 if (IS_ERR(mr)) {
192 ret = (struct ib_mr *)mr;
193 goto bail;
196 mr->mr.user_base = *iova_start;
197 mr->mr.iova = *iova_start;
198 mr->mr.access_flags = acc;
200 m = 0;
201 n = 0;
202 for (i = 0; i < num_phys_buf; i++) {
203 mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr;
204 mr->mr.map[m]->segs[n].length = buffer_list[i].size;
205 mr->mr.length += buffer_list[i].size;
206 n++;
207 if (n == QIB_SEGSZ) {
208 m++;
209 n = 0;
213 ret = &mr->ibmr;
215 bail:
216 return ret;
220 * qib_reg_user_mr - register a userspace memory region
221 * @pd: protection domain for this memory region
222 * @start: starting userspace address
223 * @length: length of region to register
224 * @mr_access_flags: access flags for this memory region
225 * @udata: unused by the QLogic_IB driver
227 * Returns the memory region on success, otherwise returns an errno.
229 struct ib_mr *qib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
230 u64 virt_addr, int mr_access_flags,
231 struct ib_udata *udata)
233 struct qib_mr *mr;
234 struct ib_umem *umem;
235 struct ib_umem_chunk *chunk;
236 int n, m, i;
237 struct ib_mr *ret;
239 if (length == 0) {
240 ret = ERR_PTR(-EINVAL);
241 goto bail;
244 umem = ib_umem_get(pd->uobject->context, start, length,
245 mr_access_flags, 0);
246 if (IS_ERR(umem))
247 return (void *) umem;
249 n = 0;
250 list_for_each_entry(chunk, &umem->chunk_list, list)
251 n += chunk->nents;
253 mr = alloc_mr(n, pd);
254 if (IS_ERR(mr)) {
255 ret = (struct ib_mr *)mr;
256 ib_umem_release(umem);
257 goto bail;
260 mr->mr.user_base = start;
261 mr->mr.iova = virt_addr;
262 mr->mr.length = length;
263 mr->mr.offset = umem->offset;
264 mr->mr.access_flags = mr_access_flags;
265 mr->umem = umem;
267 if (is_power_of_2(umem->page_size))
268 mr->mr.page_shift = ilog2(umem->page_size);
269 m = 0;
270 n = 0;
271 list_for_each_entry(chunk, &umem->chunk_list, list) {
272 for (i = 0; i < chunk->nents; i++) {
273 void *vaddr;
275 vaddr = page_address(sg_page(&chunk->page_list[i]));
276 if (!vaddr) {
277 ret = ERR_PTR(-EINVAL);
278 goto bail;
280 mr->mr.map[m]->segs[n].vaddr = vaddr;
281 mr->mr.map[m]->segs[n].length = umem->page_size;
282 n++;
283 if (n == QIB_SEGSZ) {
284 m++;
285 n = 0;
289 ret = &mr->ibmr;
291 bail:
292 return ret;
296 * qib_dereg_mr - unregister and free a memory region
297 * @ibmr: the memory region to free
299 * Returns 0 on success.
301 * Note that this is called to free MRs created by qib_get_dma_mr()
302 * or qib_reg_user_mr().
304 int qib_dereg_mr(struct ib_mr *ibmr)
306 struct qib_mr *mr = to_imr(ibmr);
307 int ret = 0;
308 unsigned long timeout;
310 qib_free_lkey(&mr->mr);
312 qib_put_mr(&mr->mr); /* will set completion if last */
313 timeout = wait_for_completion_timeout(&mr->mr.comp,
314 5 * HZ);
315 if (!timeout) {
316 qib_get_mr(&mr->mr);
317 ret = -EBUSY;
318 goto out;
320 deinit_qib_mregion(&mr->mr);
321 if (mr->umem)
322 ib_umem_release(mr->umem);
323 kfree(mr);
324 out:
325 return ret;
329 * Allocate a memory region usable with the
330 * IB_WR_FAST_REG_MR send work request.
332 * Return the memory region on success, otherwise return an errno.
334 struct ib_mr *qib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
336 struct qib_mr *mr;
338 mr = alloc_mr(max_page_list_len, pd);
339 if (IS_ERR(mr))
340 return (struct ib_mr *)mr;
342 return &mr->ibmr;
345 struct ib_fast_reg_page_list *
346 qib_alloc_fast_reg_page_list(struct ib_device *ibdev, int page_list_len)
348 unsigned size = page_list_len * sizeof(u64);
349 struct ib_fast_reg_page_list *pl;
351 if (size > PAGE_SIZE)
352 return ERR_PTR(-EINVAL);
354 pl = kzalloc(sizeof *pl, GFP_KERNEL);
355 if (!pl)
356 return ERR_PTR(-ENOMEM);
358 pl->page_list = kzalloc(size, GFP_KERNEL);
359 if (!pl->page_list)
360 goto err_free;
362 return pl;
364 err_free:
365 kfree(pl);
366 return ERR_PTR(-ENOMEM);
369 void qib_free_fast_reg_page_list(struct ib_fast_reg_page_list *pl)
371 kfree(pl->page_list);
372 kfree(pl);
376 * qib_alloc_fmr - allocate a fast memory region
377 * @pd: the protection domain for this memory region
378 * @mr_access_flags: access flags for this memory region
379 * @fmr_attr: fast memory region attributes
381 * Returns the memory region on success, otherwise returns an errno.
383 struct ib_fmr *qib_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
384 struct ib_fmr_attr *fmr_attr)
386 struct qib_fmr *fmr;
387 int m;
388 struct ib_fmr *ret;
389 int rval = -ENOMEM;
391 /* Allocate struct plus pointers to first level page tables. */
392 m = (fmr_attr->max_pages + QIB_SEGSZ - 1) / QIB_SEGSZ;
393 fmr = kzalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
394 if (!fmr)
395 goto bail;
397 rval = init_qib_mregion(&fmr->mr, pd, fmr_attr->max_pages);
398 if (rval)
399 goto bail;
402 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
403 * rkey.
405 rval = qib_alloc_lkey(&fmr->mr, 0);
406 if (rval)
407 goto bail_mregion;
408 fmr->ibfmr.rkey = fmr->mr.lkey;
409 fmr->ibfmr.lkey = fmr->mr.lkey;
411 * Resources are allocated but no valid mapping (RKEY can't be
412 * used).
414 fmr->mr.access_flags = mr_access_flags;
415 fmr->mr.max_segs = fmr_attr->max_pages;
416 fmr->mr.page_shift = fmr_attr->page_shift;
418 ret = &fmr->ibfmr;
419 done:
420 return ret;
422 bail_mregion:
423 deinit_qib_mregion(&fmr->mr);
424 bail:
425 kfree(fmr);
426 ret = ERR_PTR(rval);
427 goto done;
431 * qib_map_phys_fmr - set up a fast memory region
432 * @ibmfr: the fast memory region to set up
433 * @page_list: the list of pages to associate with the fast memory region
434 * @list_len: the number of pages to associate with the fast memory region
435 * @iova: the virtual address of the start of the fast memory region
437 * This may be called from interrupt context.
440 int qib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
441 int list_len, u64 iova)
443 struct qib_fmr *fmr = to_ifmr(ibfmr);
444 struct qib_lkey_table *rkt;
445 unsigned long flags;
446 int m, n, i;
447 u32 ps;
448 int ret;
450 i = atomic_read(&fmr->mr.refcount);
451 if (i > 2)
452 return -EBUSY;
454 if (list_len > fmr->mr.max_segs) {
455 ret = -EINVAL;
456 goto bail;
458 rkt = &to_idev(ibfmr->device)->lk_table;
459 spin_lock_irqsave(&rkt->lock, flags);
460 fmr->mr.user_base = iova;
461 fmr->mr.iova = iova;
462 ps = 1 << fmr->mr.page_shift;
463 fmr->mr.length = list_len * ps;
464 m = 0;
465 n = 0;
466 for (i = 0; i < list_len; i++) {
467 fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
468 fmr->mr.map[m]->segs[n].length = ps;
469 if (++n == QIB_SEGSZ) {
470 m++;
471 n = 0;
474 spin_unlock_irqrestore(&rkt->lock, flags);
475 ret = 0;
477 bail:
478 return ret;
482 * qib_unmap_fmr - unmap fast memory regions
483 * @fmr_list: the list of fast memory regions to unmap
485 * Returns 0 on success.
487 int qib_unmap_fmr(struct list_head *fmr_list)
489 struct qib_fmr *fmr;
490 struct qib_lkey_table *rkt;
491 unsigned long flags;
493 list_for_each_entry(fmr, fmr_list, ibfmr.list) {
494 rkt = &to_idev(fmr->ibfmr.device)->lk_table;
495 spin_lock_irqsave(&rkt->lock, flags);
496 fmr->mr.user_base = 0;
497 fmr->mr.iova = 0;
498 fmr->mr.length = 0;
499 spin_unlock_irqrestore(&rkt->lock, flags);
501 return 0;
505 * qib_dealloc_fmr - deallocate a fast memory region
506 * @ibfmr: the fast memory region to deallocate
508 * Returns 0 on success.
510 int qib_dealloc_fmr(struct ib_fmr *ibfmr)
512 struct qib_fmr *fmr = to_ifmr(ibfmr);
513 int ret = 0;
514 unsigned long timeout;
516 qib_free_lkey(&fmr->mr);
517 qib_put_mr(&fmr->mr); /* will set completion if last */
518 timeout = wait_for_completion_timeout(&fmr->mr.comp,
519 5 * HZ);
520 if (!timeout) {
521 qib_get_mr(&fmr->mr);
522 ret = -EBUSY;
523 goto out;
525 deinit_qib_mregion(&fmr->mr);
526 kfree(fmr);
527 out:
528 return ret;
531 void mr_rcu_callback(struct rcu_head *list)
533 struct qib_mregion *mr = container_of(list, struct qib_mregion, list);
535 complete(&mr->comp);