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f931551b RC |
1 | /* |
2 | * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. | |
3 | * Copyright (c) 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 <rdma/ib_umem.h> | |
35 | #include <rdma/ib_smi.h> | |
36 | ||
37 | #include "qib.h" | |
38 | ||
39 | /* Fast memory region */ | |
40 | struct qib_fmr { | |
41 | struct ib_fmr ibfmr; | |
f931551b RC |
42 | struct qib_mregion mr; /* must be last */ |
43 | }; | |
44 | ||
45 | static inline struct qib_fmr *to_ifmr(struct ib_fmr *ibfmr) | |
46 | { | |
47 | return container_of(ibfmr, struct qib_fmr, ibfmr); | |
48 | } | |
49 | ||
50 | /** | |
51 | * qib_get_dma_mr - get a DMA memory region | |
52 | * @pd: protection domain for this memory region | |
53 | * @acc: access flags | |
54 | * | |
55 | * Returns the memory region on success, otherwise returns an errno. | |
56 | * Note that all DMA addresses should be created via the | |
57 | * struct ib_dma_mapping_ops functions (see qib_dma.c). | |
58 | */ | |
59 | struct ib_mr *qib_get_dma_mr(struct ib_pd *pd, int acc) | |
60 | { | |
61 | struct qib_ibdev *dev = to_idev(pd->device); | |
62 | struct qib_mr *mr; | |
63 | struct ib_mr *ret; | |
64 | unsigned long flags; | |
65 | ||
66 | if (to_ipd(pd)->user) { | |
67 | ret = ERR_PTR(-EPERM); | |
68 | goto bail; | |
69 | } | |
70 | ||
71 | mr = kzalloc(sizeof *mr, GFP_KERNEL); | |
72 | if (!mr) { | |
73 | ret = ERR_PTR(-ENOMEM); | |
74 | goto bail; | |
75 | } | |
76 | ||
77 | mr->mr.access_flags = acc; | |
78 | atomic_set(&mr->mr.refcount, 0); | |
79 | ||
80 | spin_lock_irqsave(&dev->lk_table.lock, flags); | |
81 | if (!dev->dma_mr) | |
82 | dev->dma_mr = &mr->mr; | |
83 | spin_unlock_irqrestore(&dev->lk_table.lock, flags); | |
84 | ||
85 | ret = &mr->ibmr; | |
86 | ||
87 | bail: | |
88 | return ret; | |
89 | } | |
90 | ||
91 | static struct qib_mr *alloc_mr(int count, struct qib_lkey_table *lk_table) | |
92 | { | |
93 | struct qib_mr *mr; | |
94 | int m, i = 0; | |
95 | ||
96 | /* Allocate struct plus pointers to first level page tables. */ | |
97 | m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ; | |
98 | mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL); | |
99 | if (!mr) | |
100 | goto done; | |
101 | ||
102 | /* Allocate first level page tables. */ | |
103 | for (; i < m; i++) { | |
104 | mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL); | |
105 | if (!mr->mr.map[i]) | |
106 | goto bail; | |
107 | } | |
108 | mr->mr.mapsz = m; | |
2a600f14 | 109 | mr->mr.page_shift = 0; |
f931551b RC |
110 | mr->mr.max_segs = count; |
111 | ||
112 | /* | |
113 | * ib_reg_phys_mr() will initialize mr->ibmr except for | |
114 | * lkey and rkey. | |
115 | */ | |
116 | if (!qib_alloc_lkey(lk_table, &mr->mr)) | |
117 | goto bail; | |
118 | mr->ibmr.lkey = mr->mr.lkey; | |
119 | mr->ibmr.rkey = mr->mr.lkey; | |
120 | ||
121 | atomic_set(&mr->mr.refcount, 0); | |
122 | goto done; | |
123 | ||
124 | bail: | |
125 | while (i) | |
126 | kfree(mr->mr.map[--i]); | |
127 | kfree(mr); | |
128 | mr = NULL; | |
129 | ||
130 | done: | |
131 | return mr; | |
132 | } | |
133 | ||
134 | /** | |
135 | * qib_reg_phys_mr - register a physical memory region | |
136 | * @pd: protection domain for this memory region | |
137 | * @buffer_list: pointer to the list of physical buffers to register | |
138 | * @num_phys_buf: the number of physical buffers to register | |
139 | * @iova_start: the starting address passed over IB which maps to this MR | |
140 | * | |
141 | * Returns the memory region on success, otherwise returns an errno. | |
142 | */ | |
143 | struct ib_mr *qib_reg_phys_mr(struct ib_pd *pd, | |
144 | struct ib_phys_buf *buffer_list, | |
145 | int num_phys_buf, int acc, u64 *iova_start) | |
146 | { | |
147 | struct qib_mr *mr; | |
148 | int n, m, i; | |
149 | struct ib_mr *ret; | |
150 | ||
151 | mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table); | |
152 | if (mr == NULL) { | |
153 | ret = ERR_PTR(-ENOMEM); | |
154 | goto bail; | |
155 | } | |
156 | ||
157 | mr->mr.pd = pd; | |
158 | mr->mr.user_base = *iova_start; | |
159 | mr->mr.iova = *iova_start; | |
160 | mr->mr.length = 0; | |
161 | mr->mr.offset = 0; | |
162 | mr->mr.access_flags = acc; | |
163 | mr->umem = NULL; | |
164 | ||
165 | m = 0; | |
166 | n = 0; | |
167 | for (i = 0; i < num_phys_buf; i++) { | |
168 | mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr; | |
169 | mr->mr.map[m]->segs[n].length = buffer_list[i].size; | |
170 | mr->mr.length += buffer_list[i].size; | |
171 | n++; | |
172 | if (n == QIB_SEGSZ) { | |
173 | m++; | |
174 | n = 0; | |
175 | } | |
176 | } | |
177 | ||
178 | ret = &mr->ibmr; | |
179 | ||
180 | bail: | |
181 | return ret; | |
182 | } | |
183 | ||
184 | /** | |
185 | * qib_reg_user_mr - register a userspace memory region | |
186 | * @pd: protection domain for this memory region | |
187 | * @start: starting userspace address | |
188 | * @length: length of region to register | |
189 | * @virt_addr: virtual address to use (from HCA's point of view) | |
190 | * @mr_access_flags: access flags for this memory region | |
191 | * @udata: unused by the QLogic_IB driver | |
192 | * | |
193 | * Returns the memory region on success, otherwise returns an errno. | |
194 | */ | |
195 | struct ib_mr *qib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, | |
196 | u64 virt_addr, int mr_access_flags, | |
197 | struct ib_udata *udata) | |
198 | { | |
199 | struct qib_mr *mr; | |
200 | struct ib_umem *umem; | |
201 | struct ib_umem_chunk *chunk; | |
202 | int n, m, i; | |
203 | struct ib_mr *ret; | |
204 | ||
205 | if (length == 0) { | |
206 | ret = ERR_PTR(-EINVAL); | |
207 | goto bail; | |
208 | } | |
209 | ||
210 | umem = ib_umem_get(pd->uobject->context, start, length, | |
211 | mr_access_flags, 0); | |
212 | if (IS_ERR(umem)) | |
213 | return (void *) umem; | |
214 | ||
215 | n = 0; | |
216 | list_for_each_entry(chunk, &umem->chunk_list, list) | |
217 | n += chunk->nents; | |
218 | ||
219 | mr = alloc_mr(n, &to_idev(pd->device)->lk_table); | |
220 | if (!mr) { | |
221 | ret = ERR_PTR(-ENOMEM); | |
222 | ib_umem_release(umem); | |
223 | goto bail; | |
224 | } | |
225 | ||
226 | mr->mr.pd = pd; | |
227 | mr->mr.user_base = start; | |
228 | mr->mr.iova = virt_addr; | |
229 | mr->mr.length = length; | |
230 | mr->mr.offset = umem->offset; | |
231 | mr->mr.access_flags = mr_access_flags; | |
232 | mr->umem = umem; | |
233 | ||
2a600f14 MM |
234 | if (is_power_of_2(umem->page_size)) |
235 | mr->mr.page_shift = ilog2(umem->page_size); | |
f931551b RC |
236 | m = 0; |
237 | n = 0; | |
238 | list_for_each_entry(chunk, &umem->chunk_list, list) { | |
239 | for (i = 0; i < chunk->nents; i++) { | |
240 | void *vaddr; | |
241 | ||
242 | vaddr = page_address(sg_page(&chunk->page_list[i])); | |
243 | if (!vaddr) { | |
244 | ret = ERR_PTR(-EINVAL); | |
245 | goto bail; | |
246 | } | |
247 | mr->mr.map[m]->segs[n].vaddr = vaddr; | |
248 | mr->mr.map[m]->segs[n].length = umem->page_size; | |
249 | n++; | |
250 | if (n == QIB_SEGSZ) { | |
251 | m++; | |
252 | n = 0; | |
253 | } | |
254 | } | |
255 | } | |
256 | ret = &mr->ibmr; | |
257 | ||
258 | bail: | |
259 | return ret; | |
260 | } | |
261 | ||
262 | /** | |
263 | * qib_dereg_mr - unregister and free a memory region | |
264 | * @ibmr: the memory region to free | |
265 | * | |
266 | * Returns 0 on success. | |
267 | * | |
268 | * Note that this is called to free MRs created by qib_get_dma_mr() | |
269 | * or qib_reg_user_mr(). | |
270 | */ | |
271 | int qib_dereg_mr(struct ib_mr *ibmr) | |
272 | { | |
273 | struct qib_mr *mr = to_imr(ibmr); | |
274 | struct qib_ibdev *dev = to_idev(ibmr->device); | |
275 | int ret; | |
276 | int i; | |
277 | ||
278 | ret = qib_free_lkey(dev, &mr->mr); | |
279 | if (ret) | |
280 | return ret; | |
281 | ||
282 | i = mr->mr.mapsz; | |
283 | while (i) | |
284 | kfree(mr->mr.map[--i]); | |
285 | if (mr->umem) | |
286 | ib_umem_release(mr->umem); | |
287 | kfree(mr); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Allocate a memory region usable with the | |
293 | * IB_WR_FAST_REG_MR send work request. | |
294 | * | |
295 | * Return the memory region on success, otherwise return an errno. | |
296 | */ | |
297 | struct ib_mr *qib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len) | |
298 | { | |
299 | struct qib_mr *mr; | |
300 | ||
301 | mr = alloc_mr(max_page_list_len, &to_idev(pd->device)->lk_table); | |
302 | if (mr == NULL) | |
303 | return ERR_PTR(-ENOMEM); | |
304 | ||
305 | mr->mr.pd = pd; | |
306 | mr->mr.user_base = 0; | |
307 | mr->mr.iova = 0; | |
308 | mr->mr.length = 0; | |
309 | mr->mr.offset = 0; | |
310 | mr->mr.access_flags = 0; | |
311 | mr->umem = NULL; | |
312 | ||
313 | return &mr->ibmr; | |
314 | } | |
315 | ||
316 | struct ib_fast_reg_page_list * | |
317 | qib_alloc_fast_reg_page_list(struct ib_device *ibdev, int page_list_len) | |
318 | { | |
319 | unsigned size = page_list_len * sizeof(u64); | |
320 | struct ib_fast_reg_page_list *pl; | |
321 | ||
322 | if (size > PAGE_SIZE) | |
323 | return ERR_PTR(-EINVAL); | |
324 | ||
325 | pl = kmalloc(sizeof *pl, GFP_KERNEL); | |
326 | if (!pl) | |
327 | return ERR_PTR(-ENOMEM); | |
328 | ||
329 | pl->page_list = kmalloc(size, GFP_KERNEL); | |
330 | if (!pl->page_list) | |
331 | goto err_free; | |
332 | ||
333 | return pl; | |
334 | ||
335 | err_free: | |
336 | kfree(pl); | |
337 | return ERR_PTR(-ENOMEM); | |
338 | } | |
339 | ||
340 | void qib_free_fast_reg_page_list(struct ib_fast_reg_page_list *pl) | |
341 | { | |
342 | kfree(pl->page_list); | |
343 | kfree(pl); | |
344 | } | |
345 | ||
346 | /** | |
347 | * qib_alloc_fmr - allocate a fast memory region | |
348 | * @pd: the protection domain for this memory region | |
349 | * @mr_access_flags: access flags for this memory region | |
350 | * @fmr_attr: fast memory region attributes | |
351 | * | |
352 | * Returns the memory region on success, otherwise returns an errno. | |
353 | */ | |
354 | struct ib_fmr *qib_alloc_fmr(struct ib_pd *pd, int mr_access_flags, | |
355 | struct ib_fmr_attr *fmr_attr) | |
356 | { | |
357 | struct qib_fmr *fmr; | |
358 | int m, i = 0; | |
359 | struct ib_fmr *ret; | |
360 | ||
361 | /* Allocate struct plus pointers to first level page tables. */ | |
362 | m = (fmr_attr->max_pages + QIB_SEGSZ - 1) / QIB_SEGSZ; | |
363 | fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL); | |
364 | if (!fmr) | |
365 | goto bail; | |
366 | ||
367 | /* Allocate first level page tables. */ | |
368 | for (; i < m; i++) { | |
369 | fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0], | |
370 | GFP_KERNEL); | |
371 | if (!fmr->mr.map[i]) | |
372 | goto bail; | |
373 | } | |
374 | fmr->mr.mapsz = m; | |
375 | ||
376 | /* | |
377 | * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey & | |
378 | * rkey. | |
379 | */ | |
380 | if (!qib_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr)) | |
381 | goto bail; | |
382 | fmr->ibfmr.rkey = fmr->mr.lkey; | |
383 | fmr->ibfmr.lkey = fmr->mr.lkey; | |
384 | /* | |
385 | * Resources are allocated but no valid mapping (RKEY can't be | |
386 | * used). | |
387 | */ | |
388 | fmr->mr.pd = pd; | |
389 | fmr->mr.user_base = 0; | |
390 | fmr->mr.iova = 0; | |
391 | fmr->mr.length = 0; | |
392 | fmr->mr.offset = 0; | |
393 | fmr->mr.access_flags = mr_access_flags; | |
394 | fmr->mr.max_segs = fmr_attr->max_pages; | |
2a600f14 | 395 | fmr->mr.page_shift = fmr_attr->page_shift; |
f931551b RC |
396 | |
397 | atomic_set(&fmr->mr.refcount, 0); | |
398 | ret = &fmr->ibfmr; | |
399 | goto done; | |
400 | ||
401 | bail: | |
402 | while (i) | |
403 | kfree(fmr->mr.map[--i]); | |
404 | kfree(fmr); | |
405 | ret = ERR_PTR(-ENOMEM); | |
406 | ||
407 | done: | |
408 | return ret; | |
409 | } | |
410 | ||
411 | /** | |
412 | * qib_map_phys_fmr - set up a fast memory region | |
413 | * @ibmfr: the fast memory region to set up | |
414 | * @page_list: the list of pages to associate with the fast memory region | |
415 | * @list_len: the number of pages to associate with the fast memory region | |
416 | * @iova: the virtual address of the start of the fast memory region | |
417 | * | |
418 | * This may be called from interrupt context. | |
419 | */ | |
420 | ||
421 | int qib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list, | |
422 | int list_len, u64 iova) | |
423 | { | |
424 | struct qib_fmr *fmr = to_ifmr(ibfmr); | |
425 | struct qib_lkey_table *rkt; | |
426 | unsigned long flags; | |
427 | int m, n, i; | |
428 | u32 ps; | |
429 | int ret; | |
430 | ||
431 | if (atomic_read(&fmr->mr.refcount)) | |
432 | return -EBUSY; | |
433 | ||
434 | if (list_len > fmr->mr.max_segs) { | |
435 | ret = -EINVAL; | |
436 | goto bail; | |
437 | } | |
438 | rkt = &to_idev(ibfmr->device)->lk_table; | |
439 | spin_lock_irqsave(&rkt->lock, flags); | |
440 | fmr->mr.user_base = iova; | |
441 | fmr->mr.iova = iova; | |
2a600f14 | 442 | ps = 1 << fmr->mr.page_shift; |
f931551b RC |
443 | fmr->mr.length = list_len * ps; |
444 | m = 0; | |
445 | n = 0; | |
446 | for (i = 0; i < list_len; i++) { | |
447 | fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i]; | |
448 | fmr->mr.map[m]->segs[n].length = ps; | |
449 | if (++n == QIB_SEGSZ) { | |
450 | m++; | |
451 | n = 0; | |
452 | } | |
453 | } | |
454 | spin_unlock_irqrestore(&rkt->lock, flags); | |
455 | ret = 0; | |
456 | ||
457 | bail: | |
458 | return ret; | |
459 | } | |
460 | ||
461 | /** | |
462 | * qib_unmap_fmr - unmap fast memory regions | |
463 | * @fmr_list: the list of fast memory regions to unmap | |
464 | * | |
465 | * Returns 0 on success. | |
466 | */ | |
467 | int qib_unmap_fmr(struct list_head *fmr_list) | |
468 | { | |
469 | struct qib_fmr *fmr; | |
470 | struct qib_lkey_table *rkt; | |
471 | unsigned long flags; | |
472 | ||
473 | list_for_each_entry(fmr, fmr_list, ibfmr.list) { | |
474 | rkt = &to_idev(fmr->ibfmr.device)->lk_table; | |
475 | spin_lock_irqsave(&rkt->lock, flags); | |
476 | fmr->mr.user_base = 0; | |
477 | fmr->mr.iova = 0; | |
478 | fmr->mr.length = 0; | |
479 | spin_unlock_irqrestore(&rkt->lock, flags); | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | /** | |
485 | * qib_dealloc_fmr - deallocate a fast memory region | |
486 | * @ibfmr: the fast memory region to deallocate | |
487 | * | |
488 | * Returns 0 on success. | |
489 | */ | |
490 | int qib_dealloc_fmr(struct ib_fmr *ibfmr) | |
491 | { | |
492 | struct qib_fmr *fmr = to_ifmr(ibfmr); | |
493 | int ret; | |
494 | int i; | |
495 | ||
496 | ret = qib_free_lkey(to_idev(ibfmr->device), &fmr->mr); | |
497 | if (ret) | |
498 | return ret; | |
499 | ||
500 | i = fmr->mr.mapsz; | |
501 | while (i) | |
502 | kfree(fmr->mr.map[--i]); | |
503 | kfree(fmr); | |
504 | return 0; | |
505 | } |