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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#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 <stdio.h>
#include <rte_compat.h>
#include <rte_memory.h>
#include <rte_common.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_16MB 0x00000100 /**< Use 16MB pages. */
#define RTE_MEMZONE_16GB 0x00000200 /**< Use 16GB pages. */
#define RTE_MEMZONE_256KB 0x00010000 /**< Use 256KB pages. */
#define RTE_MEMZONE_256MB 0x00020000 /**< Use 256MB pages. */
#define RTE_MEMZONE_512MB 0x00040000 /**< Use 512MB pages. */
#define RTE_MEMZONE_4GB 0x00080000 /**< Use 4GB pages. */
#define RTE_MEMZONE_SIZE_HINT_ONLY 0x00000004 /**< Use available page size */
#define RTE_MEMZONE_IOVA_CONTIG 0x00100000 /**< Ask for IOVA-contiguous memzone. */
/**
* 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. */
RTE_STD_C11
union {
phys_addr_t phys_addr; /**< deprecated - Start physical address. */
rte_iova_t iova; /**< Start IO address. */
};
RTE_STD_C11
union {
void *addr; /**< Start virtual address. */
uint64_t addr_64; /**< Makes sure addr is always 64-bits */
};
size_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 Reserving memzones with len set to 0 will only attempt to allocate
* memzones from memory that is already available. It will not trigger any
* new allocations.
*
* @note: When reserving memzones with len set to 0, it is preferable to also
* set a valid socket_id. Setting socket_id to SOCKET_ID_ANY is supported, but
* will likely not yield expected results. Specifically, the resulting memzone
* may not necessarily be the biggest memzone available, but rather biggest
* memzone available on socket id corresponding to an lcore from which
* reservation was called.
*
* @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 specifically sized hugepages.
* - RTE_MEMZONE_2MB - Reserved from 2MB pages
* - RTE_MEMZONE_1GB - Reserved from 1GB pages
* - RTE_MEMZONE_16MB - Reserved from 16MB pages
* - RTE_MEMZONE_16GB - Reserved from 16GB pages
* - RTE_MEMZONE_256KB - Reserved from 256KB pages
* - RTE_MEMZONE_256MB - Reserved from 256MB pages
* - RTE_MEMZONE_512MB - Reserved from 512MB pages
* - RTE_MEMZONE_4GB - Reserved from 4GB 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.
* - RTE_MEMZONE_IOVA_CONTIG - Ensure reserved memzone is IOVA-contiguous.
* This option should be used when allocating
* memory intended for hardware rings etc.
* @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,
size_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 Reserving memzones with len set to 0 will only attempt to allocate
* memzones from memory that is already available. It will not trigger any
* new allocations.
*
* @note: When reserving memzones with len set to 0, it is preferable to also
* set a valid socket_id. Setting socket_id to SOCKET_ID_ANY is supported, but
* will likely not yield expected results. Specifically, the resulting memzone
* may not necessarily be the biggest memzone available, but rather biggest
* memzone available on socket id corresponding to an lcore from which
* reservation was called.
*
* @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 specifically sized hugepages.
* - RTE_MEMZONE_2MB - Reserved from 2MB pages
* - RTE_MEMZONE_1GB - Reserved from 1GB pages
* - RTE_MEMZONE_16MB - Reserved from 16MB pages
* - RTE_MEMZONE_16GB - Reserved from 16GB pages
* - RTE_MEMZONE_256KB - Reserved from 256KB pages
* - RTE_MEMZONE_256MB - Reserved from 256MB pages
* - RTE_MEMZONE_512MB - Reserved from 512MB pages
* - RTE_MEMZONE_4GB - Reserved from 4GB 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.
* - RTE_MEMZONE_IOVA_CONTIG - Ensure reserved memzone is IOVA-contiguous.
* This option should be used when allocating
* memory intended for hardware rings etc.
* @param align
* Alignment for resulting memzone. Must be a power of 2.
* @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,
size_t len, int socket_id,
unsigned flags, unsigned align);
/**
* Reserve a portion of physical memory with specified alignment and
* boundary.
*
* This function reserves some memory with specified alignment and
* boundary, and returns a pointer to a correctly filled memzone
* descriptor. If the allocation cannot be done or if the alignment
* or boundary are not a power of 2, returns NULL.
* Memory buffer is reserved in a way, that it wouldn't cross specified
* boundary. That implies that requested length should be less or equal
* then boundary.
*
* @note Reserving memzones with len set to 0 will only attempt to allocate
* memzones from memory that is already available. It will not trigger any
* new allocations.
*
* @note: When reserving memzones with len set to 0, it is preferable to also
* set a valid socket_id. Setting socket_id to SOCKET_ID_ANY is supported, but
* will likely not yield expected results. Specifically, the resulting memzone
* may not necessarily be the biggest memzone available, but rather biggest
* memzone available on socket id corresponding to an lcore from which
* reservation was called.
*
* @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 specifically sized hugepages.
* - RTE_MEMZONE_2MB - Reserved from 2MB pages
* - RTE_MEMZONE_1GB - Reserved from 1GB pages
* - RTE_MEMZONE_16MB - Reserved from 16MB pages
* - RTE_MEMZONE_16GB - Reserved from 16GB pages
* - RTE_MEMZONE_256KB - Reserved from 256KB pages
* - RTE_MEMZONE_256MB - Reserved from 256MB pages
* - RTE_MEMZONE_512MB - Reserved from 512MB pages
* - RTE_MEMZONE_4GB - Reserved from 4GB 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.
* - RTE_MEMZONE_IOVA_CONTIG - Ensure reserved memzone is IOVA-contiguous.
* This option should be used when allocating
* memory intended for hardware rings etc.
* @param align
* Alignment for resulting memzone. Must be a power of 2.
* @param bound
* Boundary for resulting memzone. Must be a power of 2 or zero.
* Zero value implies no boundary condition.
* @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_bounded(const char *name,
size_t len, int socket_id,
unsigned flags, unsigned align, unsigned bound);
/**
* Free a memzone.
*
* @param mz
* A pointer to the memzone
* @return
* -EINVAL - invalid parameter.
* 0 - success
*/
int rte_memzone_free(const struct rte_memzone *mz);
/**
* 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 a file.
*
* @param f
* A pointer to a file for output
*/
void rte_memzone_dump(FILE *f);
/**
* Walk list of all memzones
*
* @param func
* Iterator function
* @param arg
* Argument passed to iterator
*/
void rte_memzone_walk(void (*func)(const struct rte_memzone *, void *arg),
void *arg);
#ifdef __cplusplus
}
#endif
#endif /* _RTE_MEMZONE_H_ */
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