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1 | /*- |
2 | * BSD LICENSE | |
3 | * | |
4 | * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * * Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * * Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * * Neither the name of Intel Corporation nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
24 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
25 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
26 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
27 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | #include <sys/types.h> | |
34 | #include <sys/sysctl.h> | |
35 | #include <sys/mman.h> | |
36 | #include <string.h> | |
37 | ||
38 | #include <rte_log.h> | |
39 | #include <fcntl.h> | |
40 | #include "eal_hugepages.h" | |
41 | #include "eal_internal_cfg.h" | |
42 | #include "eal_filesystem.h" | |
43 | ||
44 | #define CONTIGMEM_DEV "/dev/contigmem" | |
45 | ||
46 | /* | |
47 | * Uses mmap to create a shared memory area for storage of data | |
48 | * Used in this file to store the hugepage file map on disk | |
49 | */ | |
50 | static void * | |
51 | create_shared_memory(const char *filename, const size_t mem_size) | |
52 | { | |
53 | void *retval; | |
54 | int fd = open(filename, O_CREAT | O_RDWR, 0666); | |
55 | if (fd < 0) | |
56 | return NULL; | |
57 | if (ftruncate(fd, mem_size) < 0) { | |
58 | close(fd); | |
59 | return NULL; | |
60 | } | |
61 | retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
62 | close(fd); | |
63 | return retval; | |
64 | } | |
65 | ||
66 | /* | |
67 | * No hugepage support on freebsd, but we dummy it, using contigmem driver | |
68 | */ | |
69 | int | |
70 | eal_hugepage_info_init(void) | |
71 | { | |
72 | size_t sysctl_size; | |
73 | int num_buffers, fd, error; | |
74 | int64_t buffer_size; | |
75 | /* re-use the linux "internal config" structure for our memory data */ | |
76 | struct hugepage_info *hpi = &internal_config.hugepage_info[0]; | |
77 | struct hugepage_info *tmp_hpi; | |
78 | ||
79 | sysctl_size = sizeof(num_buffers); | |
80 | error = sysctlbyname("hw.contigmem.num_buffers", &num_buffers, | |
81 | &sysctl_size, NULL, 0); | |
82 | ||
83 | if (error != 0) { | |
84 | RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.num_buffers"); | |
85 | return -1; | |
86 | } | |
87 | ||
88 | sysctl_size = sizeof(buffer_size); | |
89 | error = sysctlbyname("hw.contigmem.buffer_size", &buffer_size, | |
90 | &sysctl_size, NULL, 0); | |
91 | ||
92 | if (error != 0) { | |
93 | RTE_LOG(ERR, EAL, "could not read sysctl hw.contigmem.buffer_size"); | |
94 | return -1; | |
95 | } | |
96 | ||
97 | fd = open(CONTIGMEM_DEV, O_RDWR); | |
98 | if (fd < 0) { | |
99 | RTE_LOG(ERR, EAL, "could not open "CONTIGMEM_DEV"\n"); | |
100 | return -1; | |
101 | } | |
102 | ||
103 | if (buffer_size >= 1<<30) | |
104 | RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dGB\n", | |
105 | num_buffers, (int)(buffer_size>>30)); | |
106 | else if (buffer_size >= 1<<20) | |
107 | RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dMB\n", | |
108 | num_buffers, (int)(buffer_size>>20)); | |
109 | else | |
110 | RTE_LOG(INFO, EAL, "Contigmem driver has %d buffers, each of size %dKB\n", | |
111 | num_buffers, (int)(buffer_size>>10)); | |
112 | ||
113 | internal_config.num_hugepage_sizes = 1; | |
114 | hpi->hugedir = CONTIGMEM_DEV; | |
115 | hpi->hugepage_sz = buffer_size; | |
116 | hpi->num_pages[0] = num_buffers; | |
117 | hpi->lock_descriptor = fd; | |
118 | ||
119 | tmp_hpi = create_shared_memory(eal_hugepage_info_path(), | |
120 | sizeof(struct hugepage_info)); | |
121 | if (tmp_hpi == NULL ) { | |
122 | RTE_LOG(ERR, EAL, "Failed to create shared memory!\n"); | |
123 | return -1; | |
124 | } | |
125 | ||
126 | memcpy(tmp_hpi, hpi, sizeof(struct hugepage_info)); | |
127 | ||
128 | if ( munmap(tmp_hpi, sizeof(struct hugepage_info)) < 0) { | |
129 | RTE_LOG(ERR, EAL, "Failed to unmap shared memory!\n"); | |
130 | return -1; | |
131 | } | |
132 | ||
133 | return 0; | |
134 | } |