2 * Copyright (c) 2006, 2007 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
36 #include "ipath_verbs.h"
37 #include "ipath_kernel.h"
40 * ipath_alloc_lkey - allocate an lkey
41 * @rkt: lkey table in which to allocate the lkey
42 * @mr: memory region that this lkey protects
44 * Returns 1 if successful, otherwise returns 0.
47 int ipath_alloc_lkey(struct ipath_lkey_table *rkt, struct ipath_mregion *mr)
54 spin_lock_irqsave(&rkt->lock, flags);
56 /* Find the next available LKEY */
59 if (rkt->table[r] == NULL)
61 r = (r + 1) & (rkt->max - 1);
63 spin_unlock_irqrestore(&rkt->lock, flags);
64 ipath_dbg("LKEY table full\n");
69 rkt->next = (r + 1) & (rkt->max - 1);
71 * Make sure lkey is never zero which is reserved to indicate an
75 mr->lkey = (r << (32 - ib_ipath_lkey_table_size)) |
76 ((((1 << (24 - ib_ipath_lkey_table_size)) - 1) & rkt->gen)
83 spin_unlock_irqrestore(&rkt->lock, flags);
92 * ipath_free_lkey - free an lkey
93 * @rkt: table from which to free the lkey
94 * @lkey: lkey id to free
96 void ipath_free_lkey(struct ipath_lkey_table *rkt, u32 lkey)
103 r = lkey >> (32 - ib_ipath_lkey_table_size);
104 spin_lock_irqsave(&rkt->lock, flags);
105 rkt->table[r] = NULL;
106 spin_unlock_irqrestore(&rkt->lock, flags);
110 * ipath_lkey_ok - check IB SGE for validity and initialize
111 * @rkt: table containing lkey to check SGE against
112 * @isge: outgoing internal SGE
116 * Return 1 if valid and successful, otherwise returns 0.
118 * Check the IB SGE for validity and initialize our internal version
121 int ipath_lkey_ok(struct ipath_qp *qp, struct ipath_sge *isge,
122 struct ib_sge *sge, int acc)
124 struct ipath_lkey_table *rkt = &to_idev(qp->ibqp.device)->lk_table;
125 struct ipath_mregion *mr;
131 * We use LKEY == zero for kernel virtual addresses
132 * (see ipath_get_dma_mr and ipath_dma.c).
134 if (sge->lkey == 0) {
135 struct ipath_pd *pd = to_ipd(qp->ibqp.pd);
142 isge->vaddr = (void *) sge->addr;
143 isge->length = sge->length;
144 isge->sge_length = sge->length;
148 mr = rkt->table[(sge->lkey >> (32 - ib_ipath_lkey_table_size))];
149 if (unlikely(mr == NULL || mr->lkey != sge->lkey ||
150 qp->ibqp.pd != mr->pd)) {
155 off = sge->addr - mr->user_base;
156 if (unlikely(sge->addr < mr->user_base ||
157 off + sge->length > mr->length ||
158 (mr->access_flags & acc) != acc)) {
166 while (off >= mr->map[m]->segs[n].length) {
167 off -= mr->map[m]->segs[n].length;
169 if (n >= IPATH_SEGSZ) {
175 isge->vaddr = mr->map[m]->segs[n].vaddr + off;
176 isge->length = mr->map[m]->segs[n].length - off;
177 isge->sge_length = sge->length;
188 * ipath_rkey_ok - check the IB virtual address, length, and RKEY
189 * @dev: infiniband device
191 * @len: length of data
192 * @vaddr: virtual address to place data
193 * @rkey: rkey to check
196 * Return 1 if successful, otherwise 0.
198 int ipath_rkey_ok(struct ipath_qp *qp, struct ipath_sge_state *ss,
199 u32 len, u64 vaddr, u32 rkey, int acc)
201 struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
202 struct ipath_lkey_table *rkt = &dev->lk_table;
203 struct ipath_sge *sge = &ss->sge;
204 struct ipath_mregion *mr;
210 * We use RKEY == zero for kernel virtual addresses
211 * (see ipath_get_dma_mr and ipath_dma.c).
214 struct ipath_pd *pd = to_ipd(qp->ibqp.pd);
221 sge->vaddr = (void *) vaddr;
223 sge->sge_length = len;
230 mr = rkt->table[(rkey >> (32 - ib_ipath_lkey_table_size))];
231 if (unlikely(mr == NULL || mr->lkey != rkey ||
232 qp->ibqp.pd != mr->pd)) {
237 off = vaddr - mr->iova;
238 if (unlikely(vaddr < mr->iova || off + len > mr->length ||
239 (mr->access_flags & acc) == 0)) {
247 while (off >= mr->map[m]->segs[n].length) {
248 off -= mr->map[m]->segs[n].length;
250 if (n >= IPATH_SEGSZ) {
256 sge->vaddr = mr->map[m]->segs[n].vaddr + off;
257 sge->length = mr->map[m]->segs[n].length - off;
258 sge->sge_length = len;