/*
 * Procedures for maintaining information about logical memory blocks.
 *
 * Peter Bergner, IBM Corp.	June 2001.
 * Copyright (C) 2001 Peter Bergner.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/poison.h>
#include <linux/pfn.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/memblock.h>

static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;

struct memblock memblock __initdata_memblock = {
	.memory.regions		= memblock_memory_init_regions,
	.memory.cnt		= 1,	
	.memory.max		= INIT_MEMBLOCK_REGIONS,

	.reserved.regions	= memblock_reserved_init_regions,
	.reserved.cnt		= 1,	
	.reserved.max		= INIT_MEMBLOCK_REGIONS,

	.current_limit		= MEMBLOCK_ALLOC_ANYWHERE,
};

int memblock_debug __initdata_memblock;
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
static int memblock_reserved_in_slab __initdata_memblock = 0;

static inline const char *memblock_type_name(struct memblock_type *type)
{
	if (type == &memblock.memory)
		return "memory";
	else if (type == &memblock.reserved)
		return "reserved";
	else
		return "unknown";
}

static inline phys_addr_t memblock_cap_size(phys_addr_t base, phys_addr_t *size)
{
	return *size = min(*size, (phys_addr_t)ULLONG_MAX - base);
}

static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
				       phys_addr_t base2, phys_addr_t size2)
{
	return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
}

static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
					phys_addr_t base, phys_addr_t size)
{
	unsigned long i;

	for (i = 0; i < type->cnt; i++) {
		phys_addr_t rgnbase = type->regions[i].base;
		phys_addr_t rgnsize = type->regions[i].size;
		if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
			break;
	}

	return (i < type->cnt) ? i : -1;
}

phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
					phys_addr_t end, phys_addr_t size,
					phys_addr_t align, int nid)
{
	phys_addr_t this_start, this_end, cand;
	u64 i;

	
	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
		end = memblock.current_limit;

	
	start = max_t(phys_addr_t, start, PAGE_SIZE);
	end = max(start, end);

	for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
		this_start = clamp(this_start, start, end);
		this_end = clamp(this_end, start, end);

		if (this_end < size)
			continue;

		cand = round_down(this_end - size, align);
		if (cand >= this_start)
			return cand;
	}
	return 0;
}

phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
					phys_addr_t end, phys_addr_t size,
					phys_addr_t align)
{
	return memblock_find_in_range_node(start, end, size, align,
					   MAX_NUMNODES);
}

static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
{
	type->total_size -= type->regions[r].size;
	memmove(&type->regions[r], &type->regions[r + 1],
		(type->cnt - (r + 1)) * sizeof(type->regions[r]));
	type->cnt--;

	
	if (type->cnt == 0) {
		WARN_ON(type->total_size != 0);
		type->cnt = 1;
		type->regions[0].base = 0;
		type->regions[0].size = 0;
		memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
	}
}

phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
					phys_addr_t *addr)
{
	if (memblock.reserved.regions == memblock_reserved_init_regions)
		return 0;

	*addr = __pa(memblock.reserved.regions);

	return PAGE_ALIGN(sizeof(struct memblock_region) *
			  memblock.reserved.max);
}

static int __init_memblock memblock_double_array(struct memblock_type *type,
						phys_addr_t new_area_start,
						phys_addr_t new_area_size)
{
	struct memblock_region *new_array, *old_array;
	phys_addr_t old_alloc_size, new_alloc_size;
	phys_addr_t old_size, new_size, addr;
	int use_slab = slab_is_available();
	int *in_slab;

	if (!memblock_can_resize)
		return -1;

	
	old_size = type->max * sizeof(struct memblock_region);
	new_size = old_size << 1;
	old_alloc_size = PAGE_ALIGN(old_size);
	new_alloc_size = PAGE_ALIGN(new_size);

	
	if (type == &memblock.memory)
		in_slab = &memblock_memory_in_slab;
	else
		in_slab = &memblock_reserved_in_slab;

	if (use_slab) {
		new_array = kmalloc(new_size, GFP_KERNEL);
		addr = new_array ? __pa(new_array) : 0;
	} else {
		
		if (type != &memblock.reserved)
			new_area_start = new_area_size = 0;

		addr = memblock_find_in_range(new_area_start + new_area_size,
						memblock.current_limit,
						new_alloc_size, PAGE_SIZE);
		if (!addr && new_area_size)
			addr = memblock_find_in_range(0,
					min(new_area_start, memblock.current_limit),
					new_alloc_size, PAGE_SIZE);

		new_array = addr ? __va(addr) : 0;
	}
	if (!addr) {
		pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
		       memblock_type_name(type), type->max, type->max * 2);
		return -1;
	}

	memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]",
		 memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1);

	memcpy(new_array, type->regions, old_size);
	memset(new_array + type->max, 0, old_size);
	old_array = type->regions;
	type->regions = new_array;
	type->max <<= 1;

	if (*in_slab)
		kfree(old_array);
	else if (old_array != memblock_memory_init_regions &&
		 old_array != memblock_reserved_init_regions)
		memblock_free(__pa(old_array), old_alloc_size);

	if (!use_slab)
		BUG_ON(memblock_reserve(addr, new_alloc_size));

	
	*in_slab = use_slab;

	return 0;
}

static void __init_memblock memblock_merge_regions(struct memblock_type *type)
{
	int i = 0;

	
	while (i < type->cnt - 1) {
		struct memblock_region *this = &type->regions[i];
		struct memblock_region *next = &type->regions[i + 1];

		if (this->base + this->size != next->base ||
		    memblock_get_region_node(this) !=
		    memblock_get_region_node(next)) {
			BUG_ON(this->base + this->size > next->base);
			i++;
			continue;
		}

		this->size += next->size;
		memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next));
		type->cnt--;
	}
}

static void __init_memblock memblock_insert_region(struct memblock_type *type,
						   int idx, phys_addr_t base,
						   phys_addr_t size, int nid)
{
	struct memblock_region *rgn = &type->regions[idx];

	BUG_ON(type->cnt >= type->max);
	memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn));
	rgn->base = base;
	rgn->size = size;
	memblock_set_region_node(rgn, nid);
	type->cnt++;
	type->total_size += size;
}

static int __init_memblock memblock_add_region(struct memblock_type *type,
				phys_addr_t base, phys_addr_t size, int nid)
{
	bool insert = false;
	phys_addr_t obase = base;
	phys_addr_t end = base + memblock_cap_size(base, &size);
	int i, nr_new;

	if (!size)
		return 0;

	
	if (type->regions[0].size == 0) {
		WARN_ON(type->cnt != 1 || type->total_size);
		type->regions[0].base = base;
		type->regions[0].size = size;
		memblock_set_region_node(&type->regions[0], nid);
		type->total_size = size;
		return 0;
	}
repeat:
	base = obase;
	nr_new = 0;

	for (i = 0; i < type->cnt; i++) {
		struct memblock_region *rgn = &type->regions[i];
		phys_addr_t rbase = rgn->base;
		phys_addr_t rend = rbase + rgn->size;

		if (rbase >= end)
			break;
		if (rend <= base)
			continue;
		if (rbase > base) {
			nr_new++;
			if (insert)
				memblock_insert_region(type, i++, base,
						       rbase - base, nid);
		}
		
		base = min(rend, end);
	}

	
	if (base < end) {
		nr_new++;
		if (insert)
			memblock_insert_region(type, i, base, end - base, nid);
	}

	if (!insert) {
		while (type->cnt + nr_new > type->max)
			if (memblock_double_array(type, obase, size) < 0)
				return -ENOMEM;
		insert = true;
		goto repeat;
	} else {
		memblock_merge_regions(type);
		return 0;
	}
}

int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
				       int nid)
{
	return memblock_add_region(&memblock.memory, base, size, nid);
}

int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
{
	return memblock_add_region(&memblock.memory, base, size, MAX_NUMNODES);
}

static int __init_memblock memblock_isolate_range(struct memblock_type *type,
					phys_addr_t base, phys_addr_t size,
					int *start_rgn, int *end_rgn)
{
	phys_addr_t end = base + memblock_cap_size(base, &size);
	int i;

	*start_rgn = *end_rgn = 0;

	if (!size)
		return 0;

	
	while (type->cnt + 2 > type->max)
		if (memblock_double_array(type, base, size) < 0)
			return -ENOMEM;

	for (i = 0; i < type->cnt; i++) {
		struct memblock_region *rgn = &type->regions[i];
		phys_addr_t rbase = rgn->base;
		phys_addr_t rend = rbase + rgn->size;

		if (rbase >= end)
			break;
		if (rend <= base)
			continue;

		if (rbase < base) {
			rgn->base = base;
			rgn->size -= base - rbase;
			type->total_size -= base - rbase;
			memblock_insert_region(type, i, rbase, base - rbase,
					       memblock_get_region_node(rgn));
		} else if (rend > end) {
			rgn->base = end;
			rgn->size -= end - rbase;
			type->total_size -= end - rbase;
			memblock_insert_region(type, i--, rbase, end - rbase,
					       memblock_get_region_node(rgn));
		} else {
			
			if (!*end_rgn)
				*start_rgn = i;
			*end_rgn = i + 1;
		}
	}

	return 0;
}

static int __init_memblock __memblock_remove(struct memblock_type *type,
					     phys_addr_t base, phys_addr_t size)
{
	int start_rgn, end_rgn;
	int i, ret;

	ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
	if (ret)
		return ret;

	for (i = end_rgn - 1; i >= start_rgn; i--)
		memblock_remove_region(type, i);
	return 0;
}

int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
{
	return __memblock_remove(&memblock.memory, base, size);
}

int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
{
	memblock_dbg("   memblock_free: [%#016llx-%#016llx] %pF\n",
		     (unsigned long long)base,
		     (unsigned long long)base + size,
		     (void *)_RET_IP_);

	return __memblock_remove(&memblock.reserved, base, size);
}

int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
{
	struct memblock_type *_rgn = &memblock.reserved;

	memblock_dbg("memblock_reserve: [%#016llx-%#016llx] %pF\n",
		     (unsigned long long)base,
		     (unsigned long long)base + size,
		     (void *)_RET_IP_);

	return memblock_add_region(_rgn, base, size, MAX_NUMNODES);
}

void __init_memblock __next_free_mem_range(u64 *idx, int nid,
					   phys_addr_t *out_start,
					   phys_addr_t *out_end, int *out_nid)
{
	struct memblock_type *mem = &memblock.memory;
	struct memblock_type *rsv = &memblock.reserved;
	int mi = *idx & 0xffffffff;
	int ri = *idx >> 32;

	for ( ; mi < mem->cnt; mi++) {
		struct memblock_region *m = &mem->regions[mi];
		phys_addr_t m_start = m->base;
		phys_addr_t m_end = m->base + m->size;

		
		if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
			continue;

		
		for ( ; ri < rsv->cnt + 1; ri++) {
			struct memblock_region *r = &rsv->regions[ri];
			phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
			phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;

			
			if (r_start >= m_end)
				break;
			
			if (m_start < r_end) {
				if (out_start)
					*out_start = max(m_start, r_start);
				if (out_end)
					*out_end = min(m_end, r_end);
				if (out_nid)
					*out_nid = memblock_get_region_node(m);
				if (m_end <= r_end)
					mi++;
				else
					ri++;
				*idx = (u32)mi | (u64)ri << 32;
				return;
			}
		}
	}

	
	*idx = ULLONG_MAX;
}

void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
					   phys_addr_t *out_start,
					   phys_addr_t *out_end, int *out_nid)
{
	struct memblock_type *mem = &memblock.memory;
	struct memblock_type *rsv = &memblock.reserved;
	int mi = *idx & 0xffffffff;
	int ri = *idx >> 32;

	if (*idx == (u64)ULLONG_MAX) {
		mi = mem->cnt - 1;
		ri = rsv->cnt;
	}

	for ( ; mi >= 0; mi--) {
		struct memblock_region *m = &mem->regions[mi];
		phys_addr_t m_start = m->base;
		phys_addr_t m_end = m->base + m->size;

		
		if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
			continue;

		
		for ( ; ri >= 0; ri--) {
			struct memblock_region *r = &rsv->regions[ri];
			phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
			phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;

			
			if (r_end <= m_start)
				break;
			
			if (m_end > r_start) {
				if (out_start)
					*out_start = max(m_start, r_start);
				if (out_end)
					*out_end = min(m_end, r_end);
				if (out_nid)
					*out_nid = memblock_get_region_node(m);

				if (m_start >= r_start)
					mi--;
				else
					ri--;
				*idx = (u32)mi | (u64)ri << 32;
				return;
			}
		}
	}

	*idx = ULLONG_MAX;
}

#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
void __init_memblock __next_mem_pfn_range(int *idx, int nid,
				unsigned long *out_start_pfn,
				unsigned long *out_end_pfn, int *out_nid)
{
	struct memblock_type *type = &memblock.memory;
	struct memblock_region *r;

	while (++*idx < type->cnt) {
		r = &type->regions[*idx];

		if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
			continue;
		if (nid == MAX_NUMNODES || nid == r->nid)
			break;
	}
	if (*idx >= type->cnt) {
		*idx = -1;
		return;
	}

	if (out_start_pfn)
		*out_start_pfn = PFN_UP(r->base);
	if (out_end_pfn)
		*out_end_pfn = PFN_DOWN(r->base + r->size);
	if (out_nid)
		*out_nid = r->nid;
}

int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
				      int nid)
{
	struct memblock_type *type = &memblock.memory;
	int start_rgn, end_rgn;
	int i, ret;

	ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
	if (ret)
		return ret;

	for (i = start_rgn; i < end_rgn; i++)
		type->regions[i].nid = nid;

	memblock_merge_regions(type);
	return 0;
}
#endif 

static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
					phys_addr_t align, phys_addr_t max_addr,
					int nid)
{
	phys_addr_t found;

	
	size = round_up(size, align);

	found = memblock_find_in_range_node(0, max_addr, size, align, nid);
	if (found && !memblock_reserve(found, size))
		return found;

	return 0;
}

phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
	return memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
}

phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
	return memblock_alloc_base_nid(size, align, max_addr, MAX_NUMNODES);
}

phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
	phys_addr_t alloc;

	alloc = __memblock_alloc_base(size, align, max_addr);

	if (alloc == 0)
		panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
		      (unsigned long long) size, (unsigned long long) max_addr);

	return alloc;
}

phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
{
	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}

phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
{
	phys_addr_t res = memblock_alloc_nid(size, align, nid);

	if (res)
		return res;
	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}



phys_addr_t __init memblock_phys_mem_size(void)
{
	return memblock.memory.total_size;
}

phys_addr_t __init_memblock memblock_start_of_DRAM(void)
{
	return memblock.memory.regions[0].base;
}

phys_addr_t __init_memblock memblock_end_of_DRAM(void)
{
	int idx = memblock.memory.cnt - 1;

	return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
}

void __init memblock_enforce_memory_limit(phys_addr_t limit)
{
	unsigned long i;
	phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;

	if (!limit)
		return;

	
	for (i = 0; i < memblock.memory.cnt; i++) {
		struct memblock_region *r = &memblock.memory.regions[i];

		if (limit <= r->size) {
			max_addr = r->base + limit;
			break;
		}
		limit -= r->size;
	}

	
	__memblock_remove(&memblock.memory, max_addr, (phys_addr_t)ULLONG_MAX);
	__memblock_remove(&memblock.reserved, max_addr, (phys_addr_t)ULLONG_MAX);
}

static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
{
	unsigned int left = 0, right = type->cnt;

	do {
		unsigned int mid = (right + left) / 2;

		if (addr < type->regions[mid].base)
			right = mid;
		else if (addr >= (type->regions[mid].base +
				  type->regions[mid].size))
			left = mid + 1;
		else
			return mid;
	} while (left < right);
	return -1;
}

int __init memblock_is_reserved(phys_addr_t addr)
{
	return memblock_search(&memblock.reserved, addr) != -1;
}

int __init_memblock memblock_is_memory(phys_addr_t addr)
{
	return memblock_search(&memblock.memory, addr) != -1;
}

int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
{
	int idx = memblock_search(&memblock.memory, base);
	phys_addr_t end = base + memblock_cap_size(base, &size);

	if (idx == -1)
		return 0;
	return memblock.memory.regions[idx].base <= base &&
		(memblock.memory.regions[idx].base +
		 memblock.memory.regions[idx].size) >= end;
}

int __init_memblock memblock_overlaps_memory(phys_addr_t base, phys_addr_t size)
{
	memblock_cap_size(base, &size);
	return memblock_overlaps_region(&memblock.memory, base, size) >= 0;
}

int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
{
	memblock_cap_size(base, &size);
	return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
}


void __init_memblock memblock_set_current_limit(phys_addr_t limit)
{
	memblock.current_limit = limit;
}

static void __init_memblock memblock_dump(struct memblock_type *type, char *name)
{
	unsigned long long base, size;
	int i;

	pr_info(" %s.cnt  = 0x%lx\n", name, type->cnt);

	for (i = 0; i < type->cnt; i++) {
		struct memblock_region *rgn = &type->regions[i];
		char nid_buf[32] = "";

		base = rgn->base;
		size = rgn->size;
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
		if (memblock_get_region_node(rgn) != MAX_NUMNODES)
			snprintf(nid_buf, sizeof(nid_buf), " on node %d",
				 memblock_get_region_node(rgn));
#endif
		pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes%s\n",
			name, i, base, base + size - 1, size, nid_buf);
	}
}

void __init_memblock __memblock_dump_all(void)
{
	pr_info("MEMBLOCK configuration:\n");
	pr_info(" memory size = %#llx reserved size = %#llx\n",
		(unsigned long long)memblock.memory.total_size,
		(unsigned long long)memblock.reserved.total_size);

	memblock_dump(&memblock.memory, "memory");
	memblock_dump(&memblock.reserved, "reserved");
}

void __init memblock_allow_resize(void)
{
	memblock_can_resize = 1;
}

static int __init early_memblock(char *p)
{
	if (p && strstr(p, "debug"))
		memblock_debug = 1;
	return 0;
}
early_param("memblock", early_memblock);

#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)

static int memblock_debug_show(struct seq_file *m, void *private)
{
	struct memblock_type *type = m->private;
	struct memblock_region *reg;
	int i;

	for (i = 0; i < type->cnt; i++) {
		reg = &type->regions[i];
		seq_printf(m, "%4d: ", i);
		if (sizeof(phys_addr_t) == 4)
			seq_printf(m, "0x%08lx..0x%08lx\n",
				   (unsigned long)reg->base,
				   (unsigned long)(reg->base + reg->size - 1));
		else
			seq_printf(m, "0x%016llx..0x%016llx\n",
				   (unsigned long long)reg->base,
				   (unsigned long long)(reg->base + reg->size - 1));

	}
	return 0;
}

static int memblock_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, memblock_debug_show, inode->i_private);
}

static const struct file_operations memblock_debug_fops = {
	.open = memblock_debug_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int __init memblock_init_debugfs(void)
{
	struct dentry *root = debugfs_create_dir("memblock", NULL);
	if (!root)
		return -ENXIO;
	debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
	debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);

	return 0;
}
__initcall(memblock_init_debugfs);

#endif