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35 #ifndef _RTE_MEMZONE_H_
36 #define _RTE_MEMZONE_H_
42 * The goal of the memzone allocator is to reserve contiguous
43 * portions of physical memory. These zones are identified by a name.
45 * The memzone descriptors are shared by all partitions and are
46 * located in a known place of physical memory. This zone is accessed
47 * using rte_eal_get_configuration(). The lookup (by name) of a
48 * memory zone can be done in any partition and returns the same
51 * A reserved memory zone cannot be unreserved. The reservation shall
52 * be done at initialization time only.
55 #include <rte_memory.h>
61 #define RTE_MEMZONE_2MB 0x00000001 /**< Use 2MB pages. */
62 #define RTE_MEMZONE_1GB 0x00000002 /**< Use 1GB pages. */
63 #define RTE_MEMZONE_SIZE_HINT_ONLY 0x00000004 /**< Use available page size */
66 * A structure describing a memzone, which is a contiguous portion of
67 * physical memory identified by a name.
71 #define RTE_MEMZONE_NAMESIZE 32 /**< Maximum length of memory zone name.*/
72 char name[RTE_MEMZONE_NAMESIZE]; /**< Name of the memory zone. */
74 phys_addr_t phys_addr; /**< Start physical address. */
76 void *addr; /**< Start virtual address. */
77 uint64_t addr_64; /**< Makes sure addr is always 64-bits */
79 size_t len; /**< Length of the memzone. */
81 size_t hugepage_sz; /**< The page size of underlying memory */
83 int32_t socket_id; /**< NUMA socket ID. */
85 uint32_t flags; /**< Characteristics of this memzone. */
86 } __attribute__((__packed__));
89 * Reserve a portion of physical memory.
91 * This function reserves some memory and returns a pointer to a
92 * correctly filled memzone descriptor. If the allocation cannot be
93 * done, return NULL. Note: A reserved zone cannot be freed.
96 * The name of the memzone. If it already exists, the function will
97 * fail and return NULL.
99 * The size of the memory to be reserved. If it
100 * is 0, the biggest contiguous zone will be reserved.
102 * The socket identifier in the case of
103 * NUMA. The value can be SOCKET_ID_ANY if there is no NUMA
104 * constraint for the reserved zone.
106 * The flags parameter is used to request memzones to be
107 * taken from 1GB or 2MB hugepages.
108 * - RTE_MEMZONE_2MB - Reserve from 2MB pages
109 * - RTE_MEMZONE_1GB - Reserve from 1GB pages
110 * - RTE_MEMZONE_SIZE_HINT_ONLY - Allow alternative page size to be used if
111 * the requested page size is unavailable.
112 * If this flag is not set, the function
113 * will return error on an unavailable size
116 * A pointer to a correctly-filled read-only memzone descriptor, or NULL
118 * On error case, rte_errno will be set appropriately:
119 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
120 * - E_RTE_SECONDARY - function was called from a secondary process instance
121 * - ENOSPC - the maximum number of memzones has already been allocated
122 * - EEXIST - a memzone with the same name already exists
123 * - ENOMEM - no appropriate memory area found in which to create memzone
124 * - EINVAL - invalid parameters
126 const struct rte_memzone *rte_memzone_reserve(const char *name,
127 size_t len, int socket_id,
131 * Reserve a portion of physical memory with alignment on a specified
134 * This function reserves some memory with alignment on a specified
135 * boundary, and returns a pointer to a correctly filled memzone
136 * descriptor. If the allocation cannot be done or if the alignment
137 * is not a power of 2, returns NULL.
138 * Note: A reserved zone cannot be freed.
141 * The name of the memzone. If it already exists, the function will
142 * fail and return NULL.
144 * The size of the memory to be reserved. If it
145 * is 0, the biggest contiguous zone will be reserved.
147 * Alignment for resulting memzone. Must be a power of 2.
149 * The socket identifier in the case of
150 * NUMA. The value can be SOCKET_ID_ANY if there is no NUMA
151 * constraint for the reserved zone.
153 * The flags parameter is used to request memzones to be
154 * taken from 1GB or 2MB hugepages.
155 * - RTE_MEMZONE_2MB - Reserve from 2MB pages
156 * - RTE_MEMZONE_1GB - Reserve from 1GB pages
157 * - RTE_MEMZONE_SIZE_HINT_ONLY - Allow alternative page size to be used if
158 * the requested page size is unavailable.
159 * If this flag is not set, the function
160 * will return error on an unavailable size
163 * A pointer to a correctly-filled read-only memzone descriptor, or NULL
165 * On error case, rte_errno will be set appropriately:
166 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
167 * - E_RTE_SECONDARY - function was called from a secondary process instance
168 * - ENOSPC - the maximum number of memzones has already been allocated
169 * - EEXIST - a memzone with the same name already exists
170 * - ENOMEM - no appropriate memory area found in which to create memzone
171 * - EINVAL - invalid parameters
173 const struct rte_memzone *rte_memzone_reserve_aligned(const char *name,
174 size_t len, int socket_id, unsigned flags,
178 * Lookup for a memzone.
180 * Get a pointer to a descriptor of an already reserved memory
181 * zone identified by the name given as an argument.
184 * The name of the memzone.
186 * A pointer to a read-only memzone descriptor.
188 const struct rte_memzone *rte_memzone_lookup(const char *name);
191 * Dump all reserved memzones to the console.
193 void rte_memzone_dump(void);
199 #endif /* _RTE_MEMZONE_H_ */