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1/*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. 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 <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/string.h>
37#include <linux/slab.h>
38
39#include "mthca_profile.h"
40
41enum {
42 MTHCA_RES_QP,
43 MTHCA_RES_EEC,
44 MTHCA_RES_SRQ,
45 MTHCA_RES_CQ,
46 MTHCA_RES_EQP,
47 MTHCA_RES_EEEC,
48 MTHCA_RES_EQ,
49 MTHCA_RES_RDB,
50 MTHCA_RES_MCG,
51 MTHCA_RES_MPT,
52 MTHCA_RES_MTT,
53 MTHCA_RES_UAR,
54 MTHCA_RES_UDAV,
55 MTHCA_RES_UARC,
56 MTHCA_RES_NUM
57};
58
59enum {
60 MTHCA_NUM_EQS = 32,
61 MTHCA_NUM_PDS = 1 << 15
62};
63
64s64 mthca_make_profile(struct mthca_dev *dev,
65 struct mthca_profile *request,
66 struct mthca_dev_lim *dev_lim,
67 struct mthca_init_hca_param *init_hca)
68{
69 struct mthca_resource {
70 u64 size;
71 u64 start;
72 int type;
73 int num;
74 int log_num;
75 };
76
77 u64 mem_base, mem_avail;
78 s64 total_size = 0;
79 struct mthca_resource *profile;
80 struct mthca_resource tmp;
81 int i, j;
82
83 profile = kzalloc(MTHCA_RES_NUM * sizeof *profile, GFP_KERNEL);
84 if (!profile)
85 return -ENOMEM;
86
87 profile[MTHCA_RES_QP].size = dev_lim->qpc_entry_sz;
88 profile[MTHCA_RES_EEC].size = dev_lim->eec_entry_sz;
89 profile[MTHCA_RES_SRQ].size = dev_lim->srq_entry_sz;
90 profile[MTHCA_RES_CQ].size = dev_lim->cqc_entry_sz;
91 profile[MTHCA_RES_EQP].size = dev_lim->eqpc_entry_sz;
92 profile[MTHCA_RES_EEEC].size = dev_lim->eeec_entry_sz;
93 profile[MTHCA_RES_EQ].size = dev_lim->eqc_entry_sz;
94 profile[MTHCA_RES_RDB].size = MTHCA_RDB_ENTRY_SIZE;
95 profile[MTHCA_RES_MCG].size = MTHCA_MGM_ENTRY_SIZE;
96 profile[MTHCA_RES_MPT].size = dev_lim->mpt_entry_sz;
97 profile[MTHCA_RES_MTT].size = dev->limits.mtt_seg_size;
98 profile[MTHCA_RES_UAR].size = dev_lim->uar_scratch_entry_sz;
99 profile[MTHCA_RES_UDAV].size = MTHCA_AV_SIZE;
100 profile[MTHCA_RES_UARC].size = request->uarc_size;
101
102 profile[MTHCA_RES_QP].num = request->num_qp;
103 profile[MTHCA_RES_SRQ].num = request->num_srq;
104 profile[MTHCA_RES_EQP].num = request->num_qp;
105 profile[MTHCA_RES_RDB].num = request->num_qp * request->rdb_per_qp;
106 profile[MTHCA_RES_CQ].num = request->num_cq;
107 profile[MTHCA_RES_EQ].num = MTHCA_NUM_EQS;
108 profile[MTHCA_RES_MCG].num = request->num_mcg;
109 profile[MTHCA_RES_MPT].num = request->num_mpt;
110 profile[MTHCA_RES_MTT].num = request->num_mtt;
111 profile[MTHCA_RES_UAR].num = request->num_uar;
112 profile[MTHCA_RES_UARC].num = request->num_uar;
113 profile[MTHCA_RES_UDAV].num = request->num_udav;
114
115 for (i = 0; i < MTHCA_RES_NUM; ++i) {
116 profile[i].type = i;
117 profile[i].log_num = max(ffs(profile[i].num) - 1, 0);
118 profile[i].size *= profile[i].num;
119 if (mthca_is_memfree(dev))
120 profile[i].size = max(profile[i].size, (u64) PAGE_SIZE);
121 }
122
123 if (mthca_is_memfree(dev)) {
124 mem_base = 0;
125 mem_avail = dev_lim->hca.arbel.max_icm_sz;
126 } else {
127 mem_base = dev->ddr_start;
128 mem_avail = dev->fw.tavor.fw_start - dev->ddr_start;
129 }
130
131 /*
132 * Sort the resources in decreasing order of size. Since they
133 * all have sizes that are powers of 2, we'll be able to keep
134 * resources aligned to their size and pack them without gaps
135 * using the sorted order.
136 */
137 for (i = MTHCA_RES_NUM; i > 0; --i)
138 for (j = 1; j < i; ++j) {
139 if (profile[j].size > profile[j - 1].size) {
140 tmp = profile[j];
141 profile[j] = profile[j - 1];
142 profile[j - 1] = tmp;
143 }
144 }
145
146 for (i = 0; i < MTHCA_RES_NUM; ++i) {
147 if (profile[i].size) {
148 profile[i].start = mem_base + total_size;
149 total_size += profile[i].size;
150 }
151 if (total_size > mem_avail) {
152 mthca_err(dev, "Profile requires 0x%llx bytes; "
153 "won't fit in 0x%llx bytes of context memory.\n",
154 (unsigned long long) total_size,
155 (unsigned long long) mem_avail);
156 kfree(profile);
157 return -ENOMEM;
158 }
159
160 if (profile[i].size)
161 mthca_dbg(dev, "profile[%2d]--%2d/%2d @ 0x%16llx "
162 "(size 0x%8llx)\n",
163 i, profile[i].type, profile[i].log_num,
164 (unsigned long long) profile[i].start,
165 (unsigned long long) profile[i].size);
166 }
167
168 if (mthca_is_memfree(dev))
169 mthca_dbg(dev, "HCA context memory: reserving %d KB\n",
170 (int) (total_size >> 10));
171 else
172 mthca_dbg(dev, "HCA memory: allocated %d KB/%d KB (%d KB free)\n",
173 (int) (total_size >> 10), (int) (mem_avail >> 10),
174 (int) ((mem_avail - total_size) >> 10));
175
176 for (i = 0; i < MTHCA_RES_NUM; ++i) {
177 switch (profile[i].type) {
178 case MTHCA_RES_QP:
179 dev->limits.num_qps = profile[i].num;
180 init_hca->qpc_base = profile[i].start;
181 init_hca->log_num_qps = profile[i].log_num;
182 break;
183 case MTHCA_RES_EEC:
184 dev->limits.num_eecs = profile[i].num;
185 init_hca->eec_base = profile[i].start;
186 init_hca->log_num_eecs = profile[i].log_num;
187 break;
188 case MTHCA_RES_SRQ:
189 dev->limits.num_srqs = profile[i].num;
190 init_hca->srqc_base = profile[i].start;
191 init_hca->log_num_srqs = profile[i].log_num;
192 break;
193 case MTHCA_RES_CQ:
194 dev->limits.num_cqs = profile[i].num;
195 init_hca->cqc_base = profile[i].start;
196 init_hca->log_num_cqs = profile[i].log_num;
197 break;
198 case MTHCA_RES_EQP:
199 init_hca->eqpc_base = profile[i].start;
200 break;
201 case MTHCA_RES_EEEC:
202 init_hca->eeec_base = profile[i].start;
203 break;
204 case MTHCA_RES_EQ:
205 dev->limits.num_eqs = profile[i].num;
206 init_hca->eqc_base = profile[i].start;
207 init_hca->log_num_eqs = profile[i].log_num;
208 break;
209 case MTHCA_RES_RDB:
210 for (dev->qp_table.rdb_shift = 0;
211 request->num_qp << dev->qp_table.rdb_shift < profile[i].num;
212 ++dev->qp_table.rdb_shift)
213 ; /* nothing */
214 dev->qp_table.rdb_base = (u32) profile[i].start;
215 init_hca->rdb_base = profile[i].start;
216 break;
217 case MTHCA_RES_MCG:
218 dev->limits.num_mgms = profile[i].num >> 1;
219 dev->limits.num_amgms = profile[i].num >> 1;
220 init_hca->mc_base = profile[i].start;
221 init_hca->log_mc_entry_sz = ffs(MTHCA_MGM_ENTRY_SIZE) - 1;
222 init_hca->log_mc_table_sz = profile[i].log_num;
223 init_hca->mc_hash_sz = 1 << (profile[i].log_num - 1);
224 break;
225 case MTHCA_RES_MPT:
226 dev->limits.num_mpts = profile[i].num;
227 dev->mr_table.mpt_base = profile[i].start;
228 init_hca->mpt_base = profile[i].start;
229 init_hca->log_mpt_sz = profile[i].log_num;
230 break;
231 case MTHCA_RES_MTT:
232 dev->limits.num_mtt_segs = profile[i].num;
233 dev->mr_table.mtt_base = profile[i].start;
234 init_hca->mtt_base = profile[i].start;
235 init_hca->mtt_seg_sz = ffs(dev->limits.mtt_seg_size) - 7;
236 break;
237 case MTHCA_RES_UAR:
238 dev->limits.num_uars = profile[i].num;
239 init_hca->uar_scratch_base = profile[i].start;
240 break;
241 case MTHCA_RES_UDAV:
242 dev->av_table.ddr_av_base = profile[i].start;
243 dev->av_table.num_ddr_avs = profile[i].num;
244 break;
245 case MTHCA_RES_UARC:
246 dev->uar_table.uarc_size = request->uarc_size;
247 dev->uar_table.uarc_base = profile[i].start;
248 init_hca->uarc_base = profile[i].start;
249 init_hca->log_uarc_sz = ffs(request->uarc_size) - 13;
250 init_hca->log_uar_sz = ffs(request->num_uar) - 1;
251 break;
252 default:
253 break;
254 }
255 }
256
257 /*
258 * PDs don't take any HCA memory, but we assign them as part
259 * of the HCA profile anyway.
260 */
261 dev->limits.num_pds = MTHCA_NUM_PDS;
262
263 if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT &&
264 init_hca->log_mpt_sz > 23) {
265 mthca_warn(dev, "MPT table too large (requested size 2^%d >= 2^24)\n",
266 init_hca->log_mpt_sz);
267 mthca_warn(dev, "Disabling memory key throughput optimization.\n");
268 dev->mthca_flags &= ~MTHCA_FLAG_SINAI_OPT;
269 }
270
271 /*
272 * For Tavor, FMRs use ioremapped PCI memory. For 32 bit
273 * systems it may use too much vmalloc space to map all MTT
274 * memory, so we reserve some MTTs for FMR access, taking them
275 * out of the MR pool. They don't use additional memory, but
276 * we assign them as part of the HCA profile anyway.
277 */
278 if (mthca_is_memfree(dev) || BITS_PER_LONG == 64)
279 dev->limits.fmr_reserved_mtts = 0;
280 else
281 dev->limits.fmr_reserved_mtts = request->fmr_reserved_mtts;
282
283 kfree(profile);
284 return total_size;
285}
1/*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. 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 <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/string.h>
37#include <linux/slab.h>
38
39#include "mthca_profile.h"
40
41enum {
42 MTHCA_RES_QP,
43 MTHCA_RES_EEC,
44 MTHCA_RES_SRQ,
45 MTHCA_RES_CQ,
46 MTHCA_RES_EQP,
47 MTHCA_RES_EEEC,
48 MTHCA_RES_EQ,
49 MTHCA_RES_RDB,
50 MTHCA_RES_MCG,
51 MTHCA_RES_MPT,
52 MTHCA_RES_MTT,
53 MTHCA_RES_UAR,
54 MTHCA_RES_UDAV,
55 MTHCA_RES_UARC,
56 MTHCA_RES_NUM
57};
58
59enum {
60 MTHCA_NUM_EQS = 32,
61 MTHCA_NUM_PDS = 1 << 15
62};
63
64s64 mthca_make_profile(struct mthca_dev *dev,
65 struct mthca_profile *request,
66 struct mthca_dev_lim *dev_lim,
67 struct mthca_init_hca_param *init_hca)
68{
69 struct mthca_resource {
70 u64 size;
71 u64 start;
72 int type;
73 int num;
74 int log_num;
75 };
76
77 u64 mem_base, mem_avail;
78 s64 total_size = 0;
79 struct mthca_resource *profile;
80 int i, j;
81
82 profile = kcalloc(MTHCA_RES_NUM, sizeof(*profile), GFP_KERNEL);
83 if (!profile)
84 return -ENOMEM;
85
86 profile[MTHCA_RES_QP].size = dev_lim->qpc_entry_sz;
87 profile[MTHCA_RES_EEC].size = dev_lim->eec_entry_sz;
88 profile[MTHCA_RES_SRQ].size = dev_lim->srq_entry_sz;
89 profile[MTHCA_RES_CQ].size = dev_lim->cqc_entry_sz;
90 profile[MTHCA_RES_EQP].size = dev_lim->eqpc_entry_sz;
91 profile[MTHCA_RES_EEEC].size = dev_lim->eeec_entry_sz;
92 profile[MTHCA_RES_EQ].size = dev_lim->eqc_entry_sz;
93 profile[MTHCA_RES_RDB].size = MTHCA_RDB_ENTRY_SIZE;
94 profile[MTHCA_RES_MCG].size = MTHCA_MGM_ENTRY_SIZE;
95 profile[MTHCA_RES_MPT].size = dev_lim->mpt_entry_sz;
96 profile[MTHCA_RES_MTT].size = dev->limits.mtt_seg_size;
97 profile[MTHCA_RES_UAR].size = dev_lim->uar_scratch_entry_sz;
98 profile[MTHCA_RES_UDAV].size = MTHCA_AV_SIZE;
99 profile[MTHCA_RES_UARC].size = request->uarc_size;
100
101 profile[MTHCA_RES_QP].num = request->num_qp;
102 profile[MTHCA_RES_SRQ].num = request->num_srq;
103 profile[MTHCA_RES_EQP].num = request->num_qp;
104 profile[MTHCA_RES_RDB].num = request->num_qp * request->rdb_per_qp;
105 profile[MTHCA_RES_CQ].num = request->num_cq;
106 profile[MTHCA_RES_EQ].num = MTHCA_NUM_EQS;
107 profile[MTHCA_RES_MCG].num = request->num_mcg;
108 profile[MTHCA_RES_MPT].num = request->num_mpt;
109 profile[MTHCA_RES_MTT].num = request->num_mtt;
110 profile[MTHCA_RES_UAR].num = request->num_uar;
111 profile[MTHCA_RES_UARC].num = request->num_uar;
112 profile[MTHCA_RES_UDAV].num = request->num_udav;
113
114 for (i = 0; i < MTHCA_RES_NUM; ++i) {
115 profile[i].type = i;
116 profile[i].log_num = max(ffs(profile[i].num) - 1, 0);
117 profile[i].size *= profile[i].num;
118 if (mthca_is_memfree(dev))
119 profile[i].size = max(profile[i].size, (u64) PAGE_SIZE);
120 }
121
122 if (mthca_is_memfree(dev)) {
123 mem_base = 0;
124 mem_avail = dev_lim->hca.arbel.max_icm_sz;
125 } else {
126 mem_base = dev->ddr_start;
127 mem_avail = dev->fw.tavor.fw_start - dev->ddr_start;
128 }
129
130 /*
131 * Sort the resources in decreasing order of size. Since they
132 * all have sizes that are powers of 2, we'll be able to keep
133 * resources aligned to their size and pack them without gaps
134 * using the sorted order.
135 */
136 for (i = MTHCA_RES_NUM; i > 0; --i)
137 for (j = 1; j < i; ++j) {
138 if (profile[j].size > profile[j - 1].size)
139 swap(profile[j], profile[j - 1]);
140 }
141
142 for (i = 0; i < MTHCA_RES_NUM; ++i) {
143 if (profile[i].size) {
144 profile[i].start = mem_base + total_size;
145 total_size += profile[i].size;
146 }
147 if (total_size > mem_avail) {
148 mthca_err(dev, "Profile requires 0x%llx bytes; "
149 "won't fit in 0x%llx bytes of context memory.\n",
150 (unsigned long long) total_size,
151 (unsigned long long) mem_avail);
152 kfree(profile);
153 return -ENOMEM;
154 }
155
156 if (profile[i].size)
157 mthca_dbg(dev, "profile[%2d]--%2d/%2d @ 0x%16llx "
158 "(size 0x%8llx)\n",
159 i, profile[i].type, profile[i].log_num,
160 (unsigned long long) profile[i].start,
161 (unsigned long long) profile[i].size);
162 }
163
164 if (mthca_is_memfree(dev))
165 mthca_dbg(dev, "HCA context memory: reserving %d KB\n",
166 (int) (total_size >> 10));
167 else
168 mthca_dbg(dev, "HCA memory: allocated %d KB/%d KB (%d KB free)\n",
169 (int) (total_size >> 10), (int) (mem_avail >> 10),
170 (int) ((mem_avail - total_size) >> 10));
171
172 for (i = 0; i < MTHCA_RES_NUM; ++i) {
173 switch (profile[i].type) {
174 case MTHCA_RES_QP:
175 dev->limits.num_qps = profile[i].num;
176 init_hca->qpc_base = profile[i].start;
177 init_hca->log_num_qps = profile[i].log_num;
178 break;
179 case MTHCA_RES_EEC:
180 dev->limits.num_eecs = profile[i].num;
181 init_hca->eec_base = profile[i].start;
182 init_hca->log_num_eecs = profile[i].log_num;
183 break;
184 case MTHCA_RES_SRQ:
185 dev->limits.num_srqs = profile[i].num;
186 init_hca->srqc_base = profile[i].start;
187 init_hca->log_num_srqs = profile[i].log_num;
188 break;
189 case MTHCA_RES_CQ:
190 dev->limits.num_cqs = profile[i].num;
191 init_hca->cqc_base = profile[i].start;
192 init_hca->log_num_cqs = profile[i].log_num;
193 break;
194 case MTHCA_RES_EQP:
195 init_hca->eqpc_base = profile[i].start;
196 break;
197 case MTHCA_RES_EEEC:
198 init_hca->eeec_base = profile[i].start;
199 break;
200 case MTHCA_RES_EQ:
201 dev->limits.num_eqs = profile[i].num;
202 init_hca->eqc_base = profile[i].start;
203 init_hca->log_num_eqs = profile[i].log_num;
204 break;
205 case MTHCA_RES_RDB:
206 for (dev->qp_table.rdb_shift = 0;
207 request->num_qp << dev->qp_table.rdb_shift < profile[i].num;
208 ++dev->qp_table.rdb_shift)
209 ; /* nothing */
210 dev->qp_table.rdb_base = (u32) profile[i].start;
211 init_hca->rdb_base = profile[i].start;
212 break;
213 case MTHCA_RES_MCG:
214 dev->limits.num_mgms = profile[i].num >> 1;
215 dev->limits.num_amgms = profile[i].num >> 1;
216 init_hca->mc_base = profile[i].start;
217 init_hca->log_mc_entry_sz = ffs(MTHCA_MGM_ENTRY_SIZE) - 1;
218 init_hca->log_mc_table_sz = profile[i].log_num;
219 init_hca->mc_hash_sz = 1 << (profile[i].log_num - 1);
220 break;
221 case MTHCA_RES_MPT:
222 dev->limits.num_mpts = profile[i].num;
223 dev->mr_table.mpt_base = profile[i].start;
224 init_hca->mpt_base = profile[i].start;
225 init_hca->log_mpt_sz = profile[i].log_num;
226 break;
227 case MTHCA_RES_MTT:
228 dev->limits.num_mtt_segs = profile[i].num;
229 dev->mr_table.mtt_base = profile[i].start;
230 init_hca->mtt_base = profile[i].start;
231 init_hca->mtt_seg_sz = ffs(dev->limits.mtt_seg_size) - 7;
232 break;
233 case MTHCA_RES_UAR:
234 dev->limits.num_uars = profile[i].num;
235 init_hca->uar_scratch_base = profile[i].start;
236 break;
237 case MTHCA_RES_UDAV:
238 dev->av_table.ddr_av_base = profile[i].start;
239 dev->av_table.num_ddr_avs = profile[i].num;
240 break;
241 case MTHCA_RES_UARC:
242 dev->uar_table.uarc_size = request->uarc_size;
243 dev->uar_table.uarc_base = profile[i].start;
244 init_hca->uarc_base = profile[i].start;
245 init_hca->log_uarc_sz = ffs(request->uarc_size) - 13;
246 init_hca->log_uar_sz = ffs(request->num_uar) - 1;
247 break;
248 default:
249 break;
250 }
251 }
252
253 /*
254 * PDs don't take any HCA memory, but we assign them as part
255 * of the HCA profile anyway.
256 */
257 dev->limits.num_pds = MTHCA_NUM_PDS;
258
259 if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT &&
260 init_hca->log_mpt_sz > 23) {
261 mthca_warn(dev, "MPT table too large (requested size 2^%d >= 2^24)\n",
262 init_hca->log_mpt_sz);
263 mthca_warn(dev, "Disabling memory key throughput optimization.\n");
264 dev->mthca_flags &= ~MTHCA_FLAG_SINAI_OPT;
265 }
266
267 /*
268 * For Tavor, FMRs use ioremapped PCI memory. For 32 bit
269 * systems it may use too much vmalloc space to map all MTT
270 * memory, so we reserve some MTTs for FMR access, taking them
271 * out of the MR pool. They don't use additional memory, but
272 * we assign them as part of the HCA profile anyway.
273 */
274 if (mthca_is_memfree(dev) || BITS_PER_LONG == 64)
275 dev->limits.fmr_reserved_mtts = 0;
276 else
277 dev->limits.fmr_reserved_mtts = request->fmr_reserved_mtts;
278
279 kfree(profile);
280 return total_size;
281}