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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2012 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.
*
* version: DPDK.L.1.2.3-3
*/
#ifndef _RTE_MEMZONE_H_
#define _RTE_MEMZONE_H_
/**
* @file
* RTE Memzone
*
* The goal of the memzone allocator is to reserve contiguous
* portions of physical memory. These zones are identified by a name.
*
* The memzone descriptors are shared by all partitions and are
* located in a known place of physical memory. This zone is accessed
* using rte_eal_get_configuration(). The lookup (by name) of a
* memory zone can be done in any partition and returns the same
* physical address.
*
* A reserved memory zone cannot be unreserved. The reservation shall
* be done at initialization time only.
*/
#include <rte_memory.h>
#ifdef __cplusplus
extern "C" {
#endif
#define RTE_MEMZONE_2MB 0x00000001 /**< Use 2MB pages. */
#define RTE_MEMZONE_1GB 0x00000002 /**< Use 1GB pages. */
#define RTE_MEMZONE_SIZE_HINT_ONLY 0x00000004 /**< Use available page size */
/**
* A structure describing a memzone, which is a contiguous portion of
* physical memory identified by a name.
*/
struct rte_memzone {
#define RTE_MEMZONE_NAMESIZE 32 /**< Maximum length of memory zone name.*/
char name[RTE_MEMZONE_NAMESIZE]; /**< Name of the memory zone. */
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 */
};
uint64_t len; /**< Length of the memzone. */
uint64_t hugepage_sz; /**< The page size of underlying memory */
int32_t socket_id; /**< NUMA socket ID. */
uint32_t flags; /**< Characteristics of this memzone. */
} __attribute__((__packed__));
/**
* Reserve a portion of physical memory.
*
* This function reserves some memory and returns a pointer to a
* correctly filled memzone descriptor. If the allocation cannot be
* done, return NULL. Note: A reserved zone cannot be freed.
*
* @param name
* The name of the memzone. If it already exists, the function will
* fail and return NULL.
* @param len
* The size of the memory to be reserved. If it
* is 0, the biggest contiguous zone will be reserved.
* @param socket_id
* The socket identifier in the case of
* NUMA. The value can be SOCKET_ID_ANY if there is no NUMA
* constraint for the reserved zone.
* @param flags
* The flags parameter is used to request memzones to be
* taken from 1GB or 2MB hugepages.
* - RTE_MEMZONE_2MB - Reserve from 2MB pages
* - RTE_MEMZONE_1GB - Reserve from 1GB pages
* - RTE_MEMZONE_SIZE_HINT_ONLY - Allow alternative page size to be used if
* the requested page size is unavailable.
* If this flag is not set, the function
* will return error on an unavailable size
* request.
* @return
* A pointer to a correctly-filled read-only memzone descriptor, or NULL
* on error.
* On error case, rte_errno will be set appropriately:
* - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
* - E_RTE_SECONDARY - function was called from a secondary process instance
* - ENOSPC - the maximum number of memzones has already been allocated
* - EEXIST - a memzone with the same name already exists
* - ENOMEM - no appropriate memory area found in which to create memzone
* - EINVAL - invalid parameters
*/
const struct rte_memzone *rte_memzone_reserve(const char *name,
uint64_t len, int socket_id,
unsigned flags);
/**
* Reserve a portion of physical memory with alignment on a specified
* boundary.
*
* This function reserves some memory with alignment on a specified
* boundary, and returns a pointer to a correctly filled memzone
* descriptor. If the allocation cannot be done or if the alignment
* is not a power of 2, returns NULL.
* Note: A reserved zone cannot be freed.
*
* @param name
* The name of the memzone. If it already exists, the function will
* fail and return NULL.
* @param len
* The size of the memory to be reserved. If it
* is 0, the biggest contiguous zone will be reserved.
* @param align
* Alignment for resulting memzone. Must be a power of 2.
* @param socket_id
* The socket identifier in the case of
* NUMA. The value can be SOCKET_ID_ANY if there is no NUMA
* constraint for the reserved zone.
* @param flags
* The flags parameter is used to request memzones to be
* taken from 1GB or 2MB hugepages.
* - RTE_MEMZONE_2MB - Reserve from 2MB pages
* - RTE_MEMZONE_1GB - Reserve from 1GB pages
* - RTE_MEMZONE_SIZE_HINT_ONLY - Allow alternative page size to be used if
* the requested page size is unavailable.
* If this flag is not set, the function
* will return error on an unavailable size
* request.
* @return
* A pointer to a correctly-filled read-only memzone descriptor, or NULL
* on error.
* On error case, rte_errno will be set appropriately:
* - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
* - E_RTE_SECONDARY - function was called from a secondary process instance
* - ENOSPC - the maximum number of memzones has already been allocated
* - EEXIST - a memzone with the same name already exists
* - ENOMEM - no appropriate memory area found in which to create memzone
* - EINVAL - invalid parameters
*/
const struct rte_memzone *rte_memzone_reserve_aligned(const char *name,
uint64_t len, int socket_id, unsigned flags,
unsigned align);
/**
* Lookup for a memzone.
*
* Get a pointer to a descriptor of an already reserved memory
* zone identified by the name given as an argument.
*
* @param name
* The name of the memzone.
* @return
* A pointer to a read-only memzone descriptor.
*/
const struct rte_memzone *rte_memzone_lookup(const char *name);
/**
* Dump all reserved memzones to the console.
*/
void rte_memzone_dump(void);
#ifdef __cplusplus
}
#endif
#endif /* _RTE_MEMZONE_H_ */
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