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
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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
34 #include <rdma/ib_umem.h>
35 #include <rdma/ib_smi.h>
39 /* Fast memory region */
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,
56 m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
58 mr->map[i] = kzalloc(sizeof(*mr->map[0]), GFP_KERNEL);
63 init_completion(&mr->comp);
64 /* count returning the ptr to user */
65 atomic_set(&mr->refcount, 1);
77 static void deinit_qib_mregion(struct qib_mregion *mr)
88 * qib_get_dma_mr - get a DMA memory region
89 * @pd: protection domain for this memory region
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;
102 if (to_ipd(pd)->user) {
103 ret = ERR_PTR(-EPERM);
107 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
109 ret = ERR_PTR(-ENOMEM);
113 rval = init_qib_mregion(&mr->mr, pd, 0);
120 rval = qib_alloc_lkey(&mr->mr, 1);
126 mr->mr.access_flags = acc;
132 deinit_qib_mregion(&mr->mr);
138 static struct qib_mr *alloc_mr(int count, struct ib_pd *pd)
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);
150 rval = init_qib_mregion(&mr->mr, pd, count);
154 * ib_reg_phys_mr() will initialize mr->ibmr except for
157 rval = qib_alloc_lkey(&mr->mr, 0);
160 mr->ibmr.lkey = mr->mr.lkey;
161 mr->ibmr.rkey = mr->mr.lkey;
166 deinit_qib_mregion(&mr->mr);
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)
190 mr = alloc_mr(num_phys_buf, pd);
192 ret = (struct ib_mr *)mr;
196 mr->mr.user_base = *iova_start;
197 mr->mr.iova = *iova_start;
198 mr->mr.access_flags = acc;
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;
207 if (n == QIB_SEGSZ) {
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)
234 struct ib_umem *umem;
235 struct scatterlist *sg;
240 ret = ERR_PTR(-EINVAL);
244 umem = ib_umem_get(pd->uobject->context, start, length,
247 return (void *) umem;
251 mr = alloc_mr(n, pd);
253 ret = (struct ib_mr *)mr;
254 ib_umem_release(umem);
258 mr->mr.user_base = start;
259 mr->mr.iova = virt_addr;
260 mr->mr.length = length;
261 mr->mr.offset = ib_umem_offset(umem);
262 mr->mr.access_flags = mr_access_flags;
265 if (is_power_of_2(umem->page_size))
266 mr->mr.page_shift = ilog2(umem->page_size);
269 for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
272 vaddr = page_address(sg_page(sg));
274 ret = ERR_PTR(-EINVAL);
277 mr->mr.map[m]->segs[n].vaddr = vaddr;
278 mr->mr.map[m]->segs[n].length = umem->page_size;
280 if (n == QIB_SEGSZ) {
292 * qib_dereg_mr - unregister and free a memory region
293 * @ibmr: the memory region to free
295 * Returns 0 on success.
297 * Note that this is called to free MRs created by qib_get_dma_mr()
298 * or qib_reg_user_mr().
300 int qib_dereg_mr(struct ib_mr *ibmr)
302 struct qib_mr *mr = to_imr(ibmr);
304 unsigned long timeout;
306 qib_free_lkey(&mr->mr);
308 qib_put_mr(&mr->mr); /* will set completion if last */
309 timeout = wait_for_completion_timeout(&mr->mr.comp,
316 deinit_qib_mregion(&mr->mr);
318 ib_umem_release(mr->umem);
325 * Allocate a memory region usable with the
326 * IB_WR_FAST_REG_MR send work request.
328 * Return the memory region on success, otherwise return an errno.
330 struct ib_mr *qib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
334 mr = alloc_mr(max_page_list_len, pd);
336 return (struct ib_mr *)mr;
341 struct ib_fast_reg_page_list *
342 qib_alloc_fast_reg_page_list(struct ib_device *ibdev, int page_list_len)
344 unsigned size = page_list_len * sizeof(u64);
345 struct ib_fast_reg_page_list *pl;
347 if (size > PAGE_SIZE)
348 return ERR_PTR(-EINVAL);
350 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
352 return ERR_PTR(-ENOMEM);
354 pl->page_list = kzalloc(size, GFP_KERNEL);
362 return ERR_PTR(-ENOMEM);
365 void qib_free_fast_reg_page_list(struct ib_fast_reg_page_list *pl)
367 kfree(pl->page_list);
372 * qib_alloc_fmr - allocate a fast memory region
373 * @pd: the protection domain for this memory region
374 * @mr_access_flags: access flags for this memory region
375 * @fmr_attr: fast memory region attributes
377 * Returns the memory region on success, otherwise returns an errno.
379 struct ib_fmr *qib_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
380 struct ib_fmr_attr *fmr_attr)
387 /* Allocate struct plus pointers to first level page tables. */
388 m = (fmr_attr->max_pages + QIB_SEGSZ - 1) / QIB_SEGSZ;
389 fmr = kzalloc(sizeof(*fmr) + m * sizeof(fmr->mr.map[0]), GFP_KERNEL);
393 rval = init_qib_mregion(&fmr->mr, pd, fmr_attr->max_pages);
398 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
401 rval = qib_alloc_lkey(&fmr->mr, 0);
404 fmr->ibfmr.rkey = fmr->mr.lkey;
405 fmr->ibfmr.lkey = fmr->mr.lkey;
407 * Resources are allocated but no valid mapping (RKEY can't be
410 fmr->mr.access_flags = mr_access_flags;
411 fmr->mr.max_segs = fmr_attr->max_pages;
412 fmr->mr.page_shift = fmr_attr->page_shift;
419 deinit_qib_mregion(&fmr->mr);
427 * qib_map_phys_fmr - set up a fast memory region
428 * @ibmfr: the fast memory region to set up
429 * @page_list: the list of pages to associate with the fast memory region
430 * @list_len: the number of pages to associate with the fast memory region
431 * @iova: the virtual address of the start of the fast memory region
433 * This may be called from interrupt context.
436 int qib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
437 int list_len, u64 iova)
439 struct qib_fmr *fmr = to_ifmr(ibfmr);
440 struct qib_lkey_table *rkt;
446 i = atomic_read(&fmr->mr.refcount);
450 if (list_len > fmr->mr.max_segs) {
454 rkt = &to_idev(ibfmr->device)->lk_table;
455 spin_lock_irqsave(&rkt->lock, flags);
456 fmr->mr.user_base = iova;
458 ps = 1 << fmr->mr.page_shift;
459 fmr->mr.length = list_len * ps;
462 for (i = 0; i < list_len; i++) {
463 fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
464 fmr->mr.map[m]->segs[n].length = ps;
465 if (++n == QIB_SEGSZ) {
470 spin_unlock_irqrestore(&rkt->lock, flags);
478 * qib_unmap_fmr - unmap fast memory regions
479 * @fmr_list: the list of fast memory regions to unmap
481 * Returns 0 on success.
483 int qib_unmap_fmr(struct list_head *fmr_list)
486 struct qib_lkey_table *rkt;
489 list_for_each_entry(fmr, fmr_list, ibfmr.list) {
490 rkt = &to_idev(fmr->ibfmr.device)->lk_table;
491 spin_lock_irqsave(&rkt->lock, flags);
492 fmr->mr.user_base = 0;
495 spin_unlock_irqrestore(&rkt->lock, flags);
501 * qib_dealloc_fmr - deallocate a fast memory region
502 * @ibfmr: the fast memory region to deallocate
504 * Returns 0 on success.
506 int qib_dealloc_fmr(struct ib_fmr *ibfmr)
508 struct qib_fmr *fmr = to_ifmr(ibfmr);
510 unsigned long timeout;
512 qib_free_lkey(&fmr->mr);
513 qib_put_mr(&fmr->mr); /* will set completion if last */
514 timeout = wait_for_completion_timeout(&fmr->mr.comp,
517 qib_get_mr(&fmr->mr);
521 deinit_qib_mregion(&fmr->mr);
527 void mr_rcu_callback(struct rcu_head *list)
529 struct qib_mregion *mr = container_of(list, struct qib_mregion, list);