Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-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                 else
126                         mask |= buffer_list[i].addr & PAGE_MASK;
127                 if (i != num_phys_buf - 1)
128                         mask |= buffer_list[i].addr + buffer_list[i].size;
129                 else
130                         mask |= (buffer_list[i].addr + buffer_list[i].size +
131                                 PAGE_SIZE - 1) & PAGE_MASK;
132         }
133
134         if (*total_size > 0xFFFFFFFFULL)
135                 return -ENOMEM;
136
137         /* Find largest page shift we can use to cover buffers */
138         for (*shift = PAGE_SHIFT; *shift < 27; ++(*shift))
139                 if ((1ULL << *shift) & mask)
140                         break;
141
142         buffer_list[0].size += buffer_list[0].addr & ((1ULL << *shift) - 1);
143         buffer_list[0].addr &= ~0ull << *shift;
144
145         *npages = 0;
146         for (i = 0; i < num_phys_buf; ++i)
147                 *npages += (buffer_list[i].size +
148                         (1ULL << *shift) - 1) >> *shift;
149
150         if (!*npages)
151                 return -EINVAL;
152
153         *page_list = kmalloc(sizeof(u64) * *npages, GFP_KERNEL);
154         if (!*page_list)
155                 return -ENOMEM;
156
157         n = 0;
158         for (i = 0; i < num_phys_buf; ++i)
159                 for (j = 0;
160                      j < (buffer_list[i].size + (1ULL << *shift) - 1) >> *shift;
161                      ++j)
162                         (*page_list)[n++] = cpu_to_be64(buffer_list[i].addr +
163                             ((u64) j << *shift));
164
165         PDBG("%s va 0x%llx mask 0x%llx shift %d len %lld pbl_size %d\n",
166              __FUNCTION__, (unsigned long long) *iova_start,
167              (unsigned long long) mask, *shift, (unsigned long long) *total_size,
168              *npages);
169
170         return 0;
171
172 }