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34 #ifndef _RTE_MEMORY_H_
35 #define _RTE_MEMORY_H_
40 * Memory-related RTE API.
51 RTE_PGSIZE_4K = 1 << 12,
52 RTE_PGSIZE_2M = RTE_PGSIZE_4K << 9,
53 RTE_PGSIZE_1G = RTE_PGSIZE_2M <<9
56 #define SOCKET_ID_ANY -1 /**< Any NUMA socket. */
57 #define CACHE_LINE_SIZE 64 /**< Cache line size. */
58 #define CACHE_LINE_MASK (CACHE_LINE_SIZE-1) /**< Cache line mask. */
60 #define CACHE_LINE_ROUNDUP(size) \
61 (CACHE_LINE_SIZE * ((size + CACHE_LINE_SIZE - 1) / CACHE_LINE_SIZE))
62 /**< Return the first cache-aligned value greater or equal to size. */
65 * Force alignment to cache line.
67 #define __rte_cache_aligned __attribute__((__aligned__(CACHE_LINE_SIZE)))
69 typedef uint64_t phys_addr_t; /**< Physical address definition. */
72 * Physical memory segment descriptor.
75 phys_addr_t phys_addr; /**< Start physical address. */
77 void *addr; /**< Start virtual address. */
78 uint64_t addr_64; /**< Makes sure addr is always 64 bits */
80 size_t len; /**< Length of the segment. */
81 size_t hugepage_sz; /**< The pagesize of underlying memory */
82 int32_t socket_id; /**< NUMA socket ID. */
83 uint32_t nchannel; /**< Number of channels. */
84 uint32_t nrank; /**< Number of ranks. */
85 } __attribute__((__packed__));
89 * Get the layout of the available physical memory.
91 * It can be useful for an application to have the full physical
92 * memory layout to decide the size of a memory zone to reserve. This
93 * table is stored in rte_config (see rte_eal_get_configuration()).
96 * - On success, return a pointer to a read-only table of struct
97 * rte_physmem_desc elements, containing the layout of all
98 * addressable physical memory. The last element of the table
99 * contains a NULL address.
100 * - On error, return NULL. This should not happen since it is a fatal
101 * error that will probably cause the entire system to panic.
103 const struct rte_memseg *rte_eal_get_physmem_layout(void);
106 * Dump the physical memory layout to the console.
108 void rte_dump_physmem_layout(void);
111 * Get the total amount of available physical memory.
114 * The total amount of available physical memory in bytes.
116 uint64_t rte_eal_get_physmem_size(void);
119 * Get the number of memory channels.
122 * The number of memory channels on the system. The value is 0 if unknown
123 * or not the same on all devices.
125 unsigned rte_memory_get_nchannel(void);
128 * Get the number of memory ranks.
131 * The number of memory ranks on the system. The value is 0 if unknown or
132 * not the same on all devices.
134 unsigned rte_memory_get_nrank(void);
140 #endif /* _RTE_MEMORY_H_ */