summaryrefslogtreecommitdiff
path: root/lib/librte_eal/common/include/rte_memory.h
blob: ce8500bd804ef84b976d93d5a7d03a9704a05a1f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
 *   All rights reserved.
 * 
 *   Redistribution and use in source and binary forms, with or without 
 *   modification, are permitted provided that the following conditions 
 *   are met:
 * 
 *     * Redistributions of source code must retain the above copyright 
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright 
 *       notice, this list of conditions and the following disclaimer in 
 *       the documentation and/or other materials provided with the 
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its 
 *       contributors may be used to endorse or promote products derived 
 *       from this software without specific prior written permission.
 * 
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

#ifndef _RTE_MEMORY_H_
#define _RTE_MEMORY_H_

/**
 * @file
 *
 * Memory-related RTE API.
 */

#include <stdint.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

enum rte_page_sizes {
	RTE_PGSIZE_4K = 1 << 12,
	RTE_PGSIZE_2M = RTE_PGSIZE_4K << 9,
	RTE_PGSIZE_1G = RTE_PGSIZE_2M <<9
};

#define SOCKET_ID_ANY -1                    /**< Any NUMA socket. */
#define CACHE_LINE_SIZE 64                  /**< Cache line size. */
#define CACHE_LINE_MASK (CACHE_LINE_SIZE-1) /**< Cache line mask. */

#define CACHE_LINE_ROUNDUP(size) \
	(CACHE_LINE_SIZE * ((size + CACHE_LINE_SIZE - 1) / CACHE_LINE_SIZE))
/**< Return the first cache-aligned value greater or equal to size. */

/**
 * Force alignment to cache line.
 */
#define __rte_cache_aligned __attribute__((__aligned__(CACHE_LINE_SIZE)))

typedef uint64_t phys_addr_t; /**< Physical address definition. */

/**
 * Physical memory segment descriptor.
 */
struct rte_memseg {
	phys_addr_t phys_addr;      /**< Start physical address. */
	union {
		void *addr;         /**< Start virtual address. */
		uint64_t addr_64;   /**< Makes sure addr is always 64 bits */
	};
	size_t len;               /**< Length of the segment. */
	size_t hugepage_sz;       /**< The pagesize of underlying memory */
	int32_t socket_id;          /**< NUMA socket ID. */
	uint32_t nchannel;          /**< Number of channels. */
	uint32_t nrank;             /**< Number of ranks. */
} __attribute__((__packed__));


/**
 * Get the layout of the available physical memory.
 *
 * It can be useful for an application to have the full physical
 * memory layout to decide the size of a memory zone to reserve. This
 * table is stored in rte_config (see rte_eal_get_configuration()).
 *
 * @return
 *  - On success, return a pointer to a read-only table of struct
 *    rte_physmem_desc elements, containing the layout of all
 *    addressable physical memory. The last element of the table
 *    contains a NULL address.
 *  - On error, return NULL. This should not happen since it is a fatal
 *    error that will probably cause the entire system to panic.
 */
const struct rte_memseg *rte_eal_get_physmem_layout(void);

/**
 * Dump the physical memory layout to the console.
 */
void rte_dump_physmem_layout(void);

/**
 * Get the total amount of available physical memory.
 *
 * @return
 *    The total amount of available physical memory in bytes.
 */
uint64_t rte_eal_get_physmem_size(void);

/**
 * Get the number of memory channels.
 *
 * @return
 *   The number of memory channels on the system. The value is 0 if unknown
 *   or not the same on all devices.
 */
unsigned rte_memory_get_nchannel(void);

/**
 * Get the number of memory ranks.
 *
 * @return
 *   The number of memory ranks on the system. The value is 0 if unknown or
 *   not the same on all devices.
 */
unsigned rte_memory_get_nrank(void);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_MEMORY_H_ */