f-stack/dpdk/lib/librte_eal/common/include/rte_memory.h

/*-
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 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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 */

#ifndef _RTE_MEMORY_H_
#define _RTE_MEMORY_H_

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

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

#ifdef RTE_EXEC_ENV_LINUXAPP
#include <exec-env/rte_dom0_common.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

#include <rte_common.h>

enum rte_page_sizes {
	RTE_PGSIZE_4K    = 1ULL << 12,
	RTE_PGSIZE_64K   = 1ULL << 16,
	RTE_PGSIZE_256K  = 1ULL << 18,
	RTE_PGSIZE_2M    = 1ULL << 21,
	RTE_PGSIZE_16M   = 1ULL << 24,
	RTE_PGSIZE_256M  = 1ULL << 28,
	RTE_PGSIZE_512M  = 1ULL << 29,
	RTE_PGSIZE_1G    = 1ULL << 30,
	RTE_PGSIZE_4G    = 1ULL << 32,
	RTE_PGSIZE_16G   = 1ULL << 34,
};

#define SOCKET_ID_ANY -1                    /**< Any NUMA socket. */
#define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1) /**< Cache line mask. */

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

/**< Cache line size in terms of log2 */
#if RTE_CACHE_LINE_SIZE == 64
#define RTE_CACHE_LINE_SIZE_LOG2 6
#elif RTE_CACHE_LINE_SIZE == 128
#define RTE_CACHE_LINE_SIZE_LOG2 7
#else
#error "Unsupported cache line size"
#endif

#define RTE_CACHE_LINE_MIN_SIZE 64	/**< Minimum Cache line size. */

/**
 * Force alignment to cache line.
 */
#define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)

/**
 * Force minimum cache line alignment.
 */
#define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)

typedef uint64_t phys_addr_t; /**< Physical address definition. */
#define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)

/**
 * 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 */
	};
#ifdef RTE_LIBRTE_IVSHMEM
	phys_addr_t ioremap_addr; /**< Real physical address inside the VM */
#endif
	size_t len;               /**< Length of the segment. */
	uint64_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. */
#ifdef RTE_LIBRTE_XEN_DOM0
	 /**< store segment MFNs */
	uint64_t mfn[DOM0_NUM_MEMBLOCK];
#endif
} __rte_packed;

/**
 * Lock page in physical memory and prevent from swapping.
 *
 * @param virt
 *   The virtual address.
 * @return
 *   0 on success, negative on error.
 */
int rte_mem_lock_page(const void *virt);

/**
 * Get physical address of any mapped virtual address in the current process.
 * It is found by browsing the /proc/self/pagemap special file.
 * The page must be locked.
 *
 * @param virt
 *   The virtual address.
 * @return
 *   The physical address or RTE_BAD_PHYS_ADDR on error.
 */
phys_addr_t rte_mem_virt2phy(const void *virt);

/**
 * 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.
 *
 * @param f
 *   A pointer to a file for output
 */
void rte_dump_physmem_layout(FILE *f);

/**
 * 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 RTE_LIBRTE_XEN_DOM0

/**< Internal use only - should DOM0 memory mapping be used */
int rte_xen_dom0_supported(void);

/**< Internal use only - phys to virt mapping for xen */
phys_addr_t rte_xen_mem_phy2mch(int32_t, const phys_addr_t);

/**
 * Return the physical address of elt, which is an element of the pool mp.
 *
 * @param memseg_id
 *   Identifier of the memory segment owning the physical address. If
 *   set to -1, find it automatically.
 * @param phy_addr
 *   physical address of elt.
 *
 * @return
 *   The physical address or RTE_BAD_PHYS_ADDR on error.
 */
static inline phys_addr_t
rte_mem_phy2mch(int32_t memseg_id, const phys_addr_t phy_addr)
{
	if (rte_xen_dom0_supported())
		return rte_xen_mem_phy2mch(memseg_id, phy_addr);
	else
		return phy_addr;
}

/**
 * Memory init for supporting application running on Xen domain0.
 *
 * @param void
 *
 * @return
 *       0: successfully
 *	 negative: error
 */
int rte_xen_dom0_memory_init(void);

/**
 * Attach to memory setments of primary process on Xen domain0.
 *
 * @param void
 *
 * @return
 *       0: successfully
 *       negative: error
 */
int rte_xen_dom0_memory_attach(void);
#else
static inline int rte_xen_dom0_supported(void)
{
	return 0;
}

static inline phys_addr_t
rte_mem_phy2mch(int32_t memseg_id __rte_unused, const phys_addr_t phy_addr)
{
	return phy_addr;
}
#endif

#ifdef __cplusplus
}
#endif

#endif /* _RTE_MEMORY_H_ */