Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / drivers / infiniband / hw / cxgb3 / iwch_mem.c
1 /*
2  * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 #include <asm/byteorder.h>
33
34 #include <rdma/iw_cm.h>
35 #include <rdma/ib_verbs.h>
36
37 #include "cxio_hal.h"
38 #include "iwch.h"
39 #include "iwch_provider.h"
40
41 int iwch_register_mem(struct iwch_dev *rhp, struct iwch_pd *php,
42                                         struct iwch_mr *mhp,
43                                         int shift,
44                                         __be64 *page_list)
45 {
46         u32 stag;
47         u32 mmid;
48
49
50         if (cxio_register_phys_mem(&rhp->rdev,
51                                    &stag, mhp->attr.pdid,
52                                    mhp->attr.perms,
53                                    mhp->attr.zbva,
54                                    mhp->attr.va_fbo,
55                                    mhp->attr.len,
56                                    shift-12,
57                                    page_list,
58                                    &mhp->attr.pbl_size, &mhp->attr.pbl_addr))
59                 return -ENOMEM;
60         mhp->attr.state = 1;
61         mhp->attr.stag = stag;
62         mmid = stag >> 8;
63         mhp->ibmr.rkey = mhp->ibmr.lkey = stag;
64         insert_handle(rhp, &rhp->mmidr, mhp, mmid);
65         PDBG("%s mmid 0x%x mhp %p\n", __FUNCTION__, mmid, mhp);
66         return 0;
67 }
68
69 int iwch_reregister_mem(struct iwch_dev *rhp, struct iwch_pd *php,
70                                         struct iwch_mr *mhp,
71                                         int shift,
72                                         __be64 *page_list,
73                                         int npages)
74 {
75         u32 stag;
76         u32 mmid;
77
78
79         /* We could support this... */
80         if (npages > mhp->attr.pbl_size)
81                 return -ENOMEM;
82
83         stag = mhp->attr.stag;
84         if (cxio_reregister_phys_mem(&rhp->rdev,
85                                    &stag, mhp->attr.pdid,
86                                    mhp->attr.perms,
87                                    mhp->attr.zbva,
88                                    mhp->attr.va_fbo,
89                                    mhp->attr.len,
90                                    shift-12,
91                                    page_list,
92                                    &mhp->attr.pbl_size, &mhp->attr.pbl_addr))
93                 return -ENOMEM;
94         mhp->attr.state = 1;
95         mhp->attr.stag = stag;
96         mmid = stag >> 8;
97         mhp->ibmr.rkey = mhp->ibmr.lkey = stag;
98         insert_handle(rhp, &rhp->mmidr, mhp, mmid);
99         PDBG("%s mmid 0x%x mhp %p\n", __FUNCTION__, mmid, mhp);
100         return 0;
101 }
102
103 int build_phys_page_list(struct ib_phys_buf *buffer_list,
104                                         int num_phys_buf,
105                                         u64 *iova_start,
106                                         u64 *total_size,
107                                         int *npages,
108                                         int *shift,
109                                         __be64 **page_list)
110 {
111         u64 mask;
112         int i, j, n;
113
114         mask = 0;
115         *total_size = 0;
116         for (i = 0; i < num_phys_buf; ++i) {
117                 if (i != 0 && buffer_list[i].addr & ~PAGE_MASK)
118                         return -EINVAL;
119                 if (i != 0 && i != num_phys_buf - 1 &&
120                     (buffer_list[i].size & ~PAGE_MASK))
121                         return -EINVAL;
122                 *total_size += buffer_list[i].size;
123                 if (i > 0)
124                         mask |= buffer_list[i].addr;
125         }
126
127         if (*total_size > 0xFFFFFFFFULL)
128                 return -ENOMEM;
129
130         /* Find largest page shift we can use to cover buffers */
131         for (*shift = PAGE_SHIFT; *shift < 27; ++(*shift))
132                 if (num_phys_buf > 1) {
133                         if ((1ULL << *shift) & mask)
134                                 break;
135                 } else
136                         if (1ULL << *shift >=
137                             buffer_list[0].size +
138                             (buffer_list[0].addr & ((1ULL << *shift) - 1)))
139                                 break;
140
141         buffer_list[0].size += buffer_list[0].addr & ((1ULL << *shift) - 1);
142         buffer_list[0].addr &= ~0ull << *shift;
143
144         *npages = 0;
145         for (i = 0; i < num_phys_buf; ++i)
146                 *npages += (buffer_list[i].size +
147                         (1ULL << *shift) - 1) >> *shift;
148
149         if (!*npages)
150                 return -EINVAL;
151
152         *page_list = kmalloc(sizeof(u64) * *npages, GFP_KERNEL);
153         if (!*page_list)
154                 return -ENOMEM;
155
156         n = 0;
157         for (i = 0; i < num_phys_buf; ++i)
158                 for (j = 0;
159                      j < (buffer_list[i].size + (1ULL << *shift) - 1) >> *shift;
160                      ++j)
161                         (*page_list)[n++] = cpu_to_be64(buffer_list[i].addr +
162                             ((u64) j << *shift));
163
164         PDBG("%s va 0x%llx mask 0x%llx shift %d len %lld pbl_size %d\n",
165              __FUNCTION__, (unsigned long long) *iova_start,
166              (unsigned long long) mask, *shift, (unsigned long long) *total_size,
167              *npages);
168
169         return 0;
170
171 }