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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <inttypes.h>
#include <string.h>
#include <errno.h>
#include <sys/queue.h>

#include <rte_log.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_eal.h>
#include <rte_eal_memconfig.h>
#include <rte_per_lcore.h>
#include <rte_errno.h>
#include <rte_string_fns.h>
#include <rte_common.h>

#include "malloc_heap.h"
#include "malloc_elem.h"
#include "eal_private.h"

static inline const struct rte_memzone *
memzone_lookup_thread_unsafe(const char *name)
{
	struct rte_mem_config *mcfg;
	struct rte_fbarray *arr;
	const struct rte_memzone *mz;
	int i = 0;

	/* get pointer to global configuration */
	mcfg = rte_eal_get_configuration()->mem_config;
	arr = &mcfg->memzones;

	/*
	 * the algorithm is not optimal (linear), but there are few
	 * zones and this function should be called at init only
	 */
	i = rte_fbarray_find_next_used(arr, 0);
	while (i >= 0) {
		mz = rte_fbarray_get(arr, i);
		if (mz->addr != NULL &&
				!strncmp(name, mz->name, RTE_MEMZONE_NAMESIZE))
			return mz;
		i = rte_fbarray_find_next_used(arr, i + 1);
	}
	return NULL;
}


/* This function will return the greatest free block if a heap has been
 * specified. If no heap has been specified, it will return the heap and
 * length of the greatest free block available in all heaps */
static size_t
find_heap_max_free_elem(int *s, unsigned align)
{
	struct rte_mem_config *mcfg;
	struct rte_malloc_socket_stats stats;
	int i, socket = *s;
	size_t len = 0;

	/* get pointer to global configuration */
	mcfg = rte_eal_get_configuration()->mem_config;

	for (i = 0; i < RTE_MAX_NUMA_NODES; i++) {
		if ((socket != SOCKET_ID_ANY) && (socket != i))
			continue;

		malloc_heap_get_stats(&mcfg->malloc_heaps[i], &stats);
		if (stats.greatest_free_size > len) {
			len = stats.greatest_free_size;
			*s = i;
		}
	}

	if (len < MALLOC_ELEM_OVERHEAD + align)
		return 0;

	return len - MALLOC_ELEM_OVERHEAD - align;
}

static const struct rte_memzone *
memzone_reserve_aligned_thread_unsafe(const char *name, size_t len,
		int socket_id, unsigned int flags, unsigned int align,
		unsigned int bound)
{
	struct rte_memzone *mz;
	struct rte_mem_config *mcfg;
	struct rte_fbarray *arr;
	size_t requested_len;
	int mz_idx;
	bool contig;

	/* get pointer to global configuration */
	mcfg = rte_eal_get_configuration()->mem_config;
	arr = &mcfg->memzones;

	/* no more room in config */
	if (arr->count >= arr->len) {
		RTE_LOG(ERR, EAL, "%s(): No more room in config\n", __func__);
		rte_errno = ENOSPC;
		return NULL;
	}

	if (strlen(name) > sizeof(mz->name) - 1) {
		RTE_LOG(DEBUG, EAL, "%s(): memzone <%s>: name too long\n",
			__func__, name);
		rte_errno = ENAMETOOLONG;
		return NULL;
	}

	/* zone already exist */
	if ((memzone_lookup_thread_unsafe(name)) != NULL) {
		RTE_LOG(DEBUG, EAL, "%s(): memzone <%s> already exists\n",
			__func__, name);
		rte_errno = EEXIST;
		return NULL;
	}

	/* if alignment is not a power of two */
	if (align && !rte_is_power_of_2(align)) {
		RTE_LOG(ERR, EAL, "%s(): Invalid alignment: %u\n", __func__,
				align);
		rte_errno = EINVAL;
		return NULL;
	}

	/* alignment less than cache size is not allowed */
	if (align < RTE_CACHE_LINE_SIZE)
		align = RTE_CACHE_LINE_SIZE;

	/* align length on cache boundary. Check for overflow before doing so */
	if (len > SIZE_MAX - RTE_CACHE_LINE_MASK) {
		rte_errno = EINVAL; /* requested size too big */
		return NULL;
	}

	len += RTE_CACHE_LINE_MASK;
	len &= ~((size_t) RTE_CACHE_LINE_MASK);

	/* save minimal requested  length */
	requested_len = RTE_MAX((size_t)RTE_CACHE_LINE_SIZE,  len);

	/* check that boundary condition is valid */
	if (bound != 0 && (requested_len > bound || !rte_is_power_of_2(bound))) {
		rte_errno = EINVAL;
		return NULL;
	}

	if ((socket_id != SOCKET_ID_ANY) &&
	    (socket_id >= RTE_MAX_NUMA_NODES || socket_id < 0)) {
		rte_errno = EINVAL;
		return NULL;
	}

	if (!rte_eal_has_hugepages())
		socket_id = SOCKET_ID_ANY;

	contig = (flags & RTE_MEMZONE_IOVA_CONTIG) != 0;
	/* malloc only cares about size flags, remove contig flag from flags */
	flags &= ~RTE_MEMZONE_IOVA_CONTIG;

	if (len == 0) {
		/* len == 0 is only allowed for non-contiguous zones */
		if (contig) {
			RTE_LOG(DEBUG, EAL, "Reserving zero-length contiguous memzones is not supported\n");
			rte_errno = EINVAL;
			return NULL;
		}
		if (bound != 0)
			requested_len = bound;
		else {
			requested_len = find_heap_max_free_elem(&socket_id, align);
			if (requested_len == 0) {
				rte_errno = ENOMEM;
				return NULL;
			}
		}
	}

	/* allocate memory on heap */
	void *mz_addr = malloc_heap_alloc(NULL, requested_len, socket_id, flags,
			align, bound, contig);
	if (mz_addr == NULL) {
		rte_errno = ENOMEM;
		return NULL;
	}

	struct malloc_elem *elem = malloc_elem_from_data(mz_addr);

	/* fill the zone in config */
	mz_idx = rte_fbarray_find_next_free(arr, 0);

	if (mz_idx < 0) {
		mz = NULL;
	} else {
		rte_fbarray_set_used(arr, mz_idx);
		mz = rte_fbarray_get(arr, mz_idx);
	}

	if (mz == NULL) {
		RTE_LOG(ERR, EAL, "%s(): Cannot find free memzone\n", __func__);
		malloc_heap_free(elem);
		rte_errno = ENOSPC;
		return NULL;
	}

	snprintf(mz->name, sizeof(mz->name), "%s", name);
	mz->iova = rte_malloc_virt2iova(mz_addr);
	mz->addr = mz_addr;
	mz->len = (requested_len == 0 ?
			(elem->size - MALLOC_ELEM_OVERHEAD) : requested_len);
	mz->hugepage_sz = elem->msl->page_sz;
	mz->socket_id = elem->msl->socket_id;
	mz->flags = 0;

	return mz;
}

static const struct rte_memzone *
rte_memzone_reserve_thread_safe(const char *name, size_t len, int socket_id,
		unsigned int flags, unsigned int align, unsigned int bound)
{
	struct rte_mem_config *mcfg;
	const struct rte_memzone *mz = NULL;

	/* get pointer to global configuration */
	mcfg = rte_eal_get_configuration()->mem_config;

	rte_rwlock_write_lock(&mcfg->mlock);

	mz = memzone_reserve_aligned_thread_unsafe(
		name, len, socket_id, flags, align, bound);

	rte_rwlock_write_unlock(&mcfg->mlock);

	return mz;
}

/*
 * Return a pointer to a correctly filled memzone descriptor (with a
 * specified alignment and boundary). If the allocation cannot be done,
 * return NULL.
 */
const struct rte_memzone *
rte_memzone_reserve_bounded(const char *name, size_t len, int socket_id,
			    unsigned flags, unsigned align, unsigned bound)
{
	return rte_memzone_reserve_thread_safe(name, len, socket_id, flags,
					       align, bound);
}

/*
 * Return a pointer to a correctly filled memzone descriptor (with a
 * specified alignment). If the allocation cannot be done, return NULL.
 */
const struct rte_memzone *
rte_memzone_reserve_aligned(const char *name, size_t len, int socket_id,
			    unsigned flags, unsigned align)
{
	return rte_memzone_reserve_thread_safe(name, len, socket_id, flags,
					       align, 0);
}

/*
 * Return a pointer to a correctly filled memzone descriptor. If the
 * allocation cannot be done, return NULL.
 */
const struct rte_memzone *
rte_memzone_reserve(const char *name, size_t len, int socket_id,
		    unsigned flags)
{
	return rte_memzone_reserve_thread_safe(name, len, socket_id,
					       flags, RTE_CACHE_LINE_SIZE, 0);
}

int
rte_memzone_free(const struct rte_memzone *mz)
{
	struct rte_mem_config *mcfg;
	struct rte_fbarray *arr;
	struct rte_memzone *found_mz;
	int ret = 0;
	void *addr = NULL;
	unsigned idx;

	if (mz == NULL)
		return -EINVAL;

	mcfg = rte_eal_get_configuration()->mem_config;
	arr = &mcfg->memzones;

	rte_rwlock_write_lock(&mcfg->mlock);

	idx = rte_fbarray_find_idx(arr, mz);
	found_mz = rte_fbarray_get(arr, idx);

	if (found_mz == NULL) {
		ret = -EINVAL;
	} else if (found_mz->addr == NULL) {
		RTE_LOG(ERR, EAL, "Memzone is not allocated\n");
		ret = -EINVAL;
	} else {
		addr = found_mz->addr;
		memset(found_mz, 0, sizeof(*found_mz));
		rte_fbarray_set_free(arr, idx);
	}

	rte_rwlock_write_unlock(&mcfg->mlock);

	if (addr != NULL)
		rte_free(addr);

	return ret;
}

/*
 * Lookup for the memzone identified by the given name
 */
const struct rte_memzone *
rte_memzone_lookup(const char *name)
{
	struct rte_mem_config *mcfg;
	const struct rte_memzone *memzone = NULL;

	mcfg = rte_eal_get_configuration()->mem_config;

	rte_rwlock_read_lock(&mcfg->mlock);

	memzone = memzone_lookup_thread_unsafe(name);

	rte_rwlock_read_unlock(&mcfg->mlock);

	return memzone;
}

static void
dump_memzone(const struct rte_memzone *mz, void *arg)
{
	struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
	struct rte_memseg_list *msl = NULL;
	void *cur_addr, *mz_end;
	struct rte_memseg *ms;
	int mz_idx, ms_idx;
	size_t page_sz;
	FILE *f = arg;

	mz_idx = rte_fbarray_find_idx(&mcfg->memzones, mz);

	fprintf(f, "Zone %u: name:<%s>, len:0x%zx, virt:%p, "
				"socket_id:%"PRId32", flags:%"PRIx32"\n",
			mz_idx,
			mz->name,
			mz->len,
			mz->addr,
			mz->socket_id,
			mz->flags);

	/* go through each page occupied by this memzone */
	msl = rte_mem_virt2memseg_list(mz->addr);
	if (!msl) {
		RTE_LOG(DEBUG, EAL, "Skipping bad memzone\n");
		return;
	}
	page_sz = (size_t)mz->hugepage_sz;
	cur_addr = RTE_PTR_ALIGN_FLOOR(mz->addr, page_sz);
	mz_end = RTE_PTR_ADD(cur_addr, mz->len);

	fprintf(f, "physical segments used:\n");
	ms_idx = RTE_PTR_DIFF(mz->addr, msl->base_va) / page_sz;
	ms = rte_fbarray_get(&msl->memseg_arr, ms_idx);

	do {
		fprintf(f, "  addr: %p iova: 0x%" PRIx64 " "
				"len: 0x%zx "
				"pagesz: 0x%zx\n",
			cur_addr, ms->iova, ms->len, page_sz);

		/* advance VA to next page */
		cur_addr = RTE_PTR_ADD(cur_addr, page_sz);

		/* memzones occupy contiguous segments */
		++ms;
	} while (cur_addr < mz_end);
}

/* Dump all reserved memory zones on console */
void
rte_memzone_dump(FILE *f)
{
	rte_memzone_walk(dump_memzone, f);
}

/*
 * Init the memzone subsystem
 */
int
rte_eal_memzone_init(void)
{
	struct rte_mem_config *mcfg;

	/* get pointer to global configuration */
	mcfg = rte_eal_get_configuration()->mem_config;

	rte_rwlock_write_lock(&mcfg->mlock);

	if (rte_eal_process_type() == RTE_PROC_PRIMARY &&
			rte_fbarray_init(&mcfg->memzones, "memzone",
			RTE_MAX_MEMZONE, sizeof(struct rte_memzone))) {
		RTE_LOG(ERR, EAL, "Cannot allocate memzone list\n");
		return -1;
	} else if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
			rte_fbarray_attach(&mcfg->memzones)) {
		RTE_LOG(ERR, EAL, "Cannot attach to memzone list\n");
		rte_rwlock_write_unlock(&mcfg->mlock);
		return -1;
	}

	rte_rwlock_write_unlock(&mcfg->mlock);

	return 0;
}

/* Walk all reserved memory zones */
void rte_memzone_walk(void (*func)(const struct rte_memzone *, void *),
		      void *arg)
{
	struct rte_mem_config *mcfg;
	struct rte_fbarray *arr;
	int i;

	mcfg = rte_eal_get_configuration()->mem_config;
	arr = &mcfg->memzones;

	rte_rwlock_read_lock(&mcfg->mlock);
	i = rte_fbarray_find_next_used(arr, 0);
	while (i >= 0) {
		struct rte_memzone *mz = rte_fbarray_get(arr, i);
		(*func)(mz, arg);
		i = rte_fbarray_find_next_used(arr, i + 1);
	}
	rte_rwlock_read_unlock(&mcfg->mlock);
}