memblock, x86: Replace memblock_x86_reserve/free_range() with generic ones

[deliverable/linux.git] / mm / memblock.c

/*
 * 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>

struct memblock memblock __initdata_memblock;

int memblock_debug __initdata_memblock;
int memblock_can_resize __initdata_memblock;
static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;

/* inline so we don't get a warning when pr_debug is compiled out */
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";
}

/*
 * Address comparison utilities
 */
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)));
}

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;
}

/*
 * Find, allocate, deallocate or reserve unreserved regions. All allocations
 * are top-down.
 */

static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
                                          phys_addr_t size, phys_addr_t align)
{
        phys_addr_t base, res_base;
        long j;

        /* In case, huge size is requested */
        if (end < size)
                return 0;

        base = round_down(end - size, align);

        /* Prevent allocations returning 0 as it's also used to
         * indicate an allocation failure
         */
        if (start == 0)
                start = PAGE_SIZE;

        while (start <= base) {
                j = memblock_overlaps_region(&memblock.reserved, base, size);
                if (j < 0)
                        return base;
                res_base = memblock.reserved.regions[j].base;
                if (res_base < size)
                        break;
                base = round_down(res_base - size, align);
        }

        return 0;
}

/*
 * Find a free area with specified alignment in a specific range.
 */
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)
{
        long i;

        BUG_ON(0 == size);

        /* Pump up max_addr */
        if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
                end = memblock.current_limit;

        /* We do a top-down search, this tends to limit memory
         * fragmentation by keeping early boot allocs near the
         * top of memory
         */
        for (i = memblock.memory.cnt - 1; i >= 0; i--) {
                phys_addr_t memblockbase = memblock.memory.regions[i].base;
                phys_addr_t memblocksize = memblock.memory.regions[i].size;
                phys_addr_t bottom, top, found;

                if (memblocksize < size)
                        continue;
                if ((memblockbase + memblocksize) <= start)
                        break;
                bottom = max(memblockbase, start);
                top = min(memblockbase + memblocksize, end);
                if (bottom >= top)
                        continue;
                found = memblock_find_region(bottom, top, size, align);
                if (found)
                        return found;
        }
        return 0;
}

/*
 * Free memblock.reserved.regions
 */
int __init_memblock memblock_free_reserved_regions(void)
{
        if (memblock.reserved.regions == memblock_reserved_init_regions)
                return 0;

        return memblock_free(__pa(memblock.reserved.regions),
                 sizeof(struct memblock_region) * memblock.reserved.max);
}

/*
 * Reserve memblock.reserved.regions
 */
int __init_memblock memblock_reserve_reserved_regions(void)
{
        if (memblock.reserved.regions == memblock_reserved_init_regions)
                return 0;

        return memblock_reserve(__pa(memblock.reserved.regions),
                 sizeof(struct memblock_region) * memblock.reserved.max);
}

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

        /* Special case for empty arrays */
        if (type->cnt == 0) {
                type->cnt = 1;
                type->regions[0].base = 0;
                type->regions[0].size = 0;
                memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
        }
}

/* Defined below but needed now */
static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size);

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

        /* We don't allow resizing until we know about the reserved regions
         * of memory that aren't suitable for allocation
         */
        if (!memblock_can_resize)
                return -1;

        /* Calculate new doubled size */
        old_size = type->max * sizeof(struct memblock_region);
        new_size = old_size << 1;

        /* Try to find some space for it.
         *
         * WARNING: We assume that either slab_is_available() and we use it or
         * we use MEMBLOCK for allocations. That means that this is unsafe to use
         * when bootmem is currently active (unless bootmem itself is implemented
         * on top of MEMBLOCK which isn't the case yet)
         *
         * This should however not be an issue for now, as we currently only
         * call into MEMBLOCK while it's still active, or much later when slab is
         * active for memory hotplug operations
         */
        if (use_slab) {
                new_array = kmalloc(new_size, GFP_KERNEL);
                addr = new_array ? __pa(new_array) : 0;
        } else
                addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t));
        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;
        }
        new_array = __va(addr);

        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);

        /* Found space, we now need to move the array over before
         * we add the reserved region since it may be our reserved
         * array itself that is full.
         */
        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 we use SLAB that's it, we are done */
        if (use_slab)
                return 0;

        /* Add the new reserved region now. Should not fail ! */
        BUG_ON(memblock_add_region(&memblock.reserved, addr, new_size));

        /* If the array wasn't our static init one, then free it. We only do
         * that before SLAB is available as later on, we don't know whether
         * to use kfree or free_bootmem_pages(). Shouldn't be a big deal
         * anyways
         */
        if (old_array != memblock_memory_init_regions &&
            old_array != memblock_reserved_init_regions)
                memblock_free(__pa(old_array), old_size);

        return 0;
}

/**
 * memblock_merge_regions - merge neighboring compatible regions
 * @type: memblock type to scan
 *
 * Scan @type and merge neighboring compatible regions.
 */
static void __init_memblock memblock_merge_regions(struct memblock_type *type)
{
        int i = 0;

        /* cnt never goes below 1 */
        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--;
        }
}

/**
 * memblock_insert_region - insert new memblock region
 * @type: memblock type to insert into
 * @idx: index for the insertion point
 * @base: base address of the new region
 * @size: size of the new region
 *
 * Insert new memblock region [@base,@base+@size) into @type at @idx.
 * @type must already have extra room to accomodate the new region.
 */
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++;
}

/**
 * memblock_add_region - add new memblock region
 * @type: memblock type to add new region into
 * @base: base address of the new region
 * @size: size of the new region
 *
 * Add new memblock region [@base,@base+@size) into @type.  The new region
 * is allowed to overlap with existing ones - overlaps don't affect already
 * existing regions.  @type is guaranteed to be minimal (all neighbouring
 * compatible regions are merged) after the addition.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
static long __init_memblock memblock_add_region(struct memblock_type *type,
                                                phys_addr_t base, phys_addr_t size)
{
        bool insert = false;
        phys_addr_t obase = base, end = base + size;
        int i, nr_new;

        /* special case for empty array */
        if (type->regions[0].size == 0) {
                WARN_ON(type->cnt != 1);
                type->regions[0].base = base;
                type->regions[0].size = size;
                memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
                return 0;
        }
repeat:
        /*
         * The following is executed twice.  Once with %false @insert and
         * then with %true.  The first counts the number of regions needed
         * to accomodate the new area.  The second actually inserts them.
         */
        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;
                /*
                 * @rgn overlaps.  If it separates the lower part of new
                 * area, insert that portion.
                 */
                if (rbase > base) {
                        nr_new++;
                        if (insert)
                                memblock_insert_region(type, i++, base,
                                                rbase - base, MAX_NUMNODES);
                }
                /* area below @rend is dealt with, forget about it */
                base = min(rend, end);
        }

        /* insert the remaining portion */
        if (base < end) {
                nr_new++;
                if (insert)
                        memblock_insert_region(type, i, base, end - base,
                                               MAX_NUMNODES);
        }

        /*
         * If this was the first round, resize array and repeat for actual
         * insertions; otherwise, merge and return.
         */
        if (!insert) {
                while (type->cnt + nr_new > type->max)
                        if (memblock_double_array(type) < 0)
                                return -ENOMEM;
                insert = true;
                goto repeat;
        } else {
                memblock_merge_regions(type);
                return 0;
        }
}

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

static long __init_memblock __memblock_remove(struct memblock_type *type,
                                              phys_addr_t base, phys_addr_t size)
{
        phys_addr_t end = base + size;
        int i;

        /* Walk through the array for collisions */
        for (i = 0; i < type->cnt; i++) {
                struct memblock_region *rgn = &type->regions[i];
                phys_addr_t rend = rgn->base + rgn->size;

                /* Nothing more to do, exit */
                if (rgn->base > end || rgn->size == 0)
                        break;

                /* If we fully enclose the block, drop it */
                if (base <= rgn->base && end >= rend) {
                        memblock_remove_region(type, i--);
                        continue;
                }

                /* If we are fully enclosed within a block
                 * then we need to split it and we are done
                 */
                if (base > rgn->base && end < rend) {
                        rgn->size = base - rgn->base;
                        if (!memblock_add_region(type, end, rend - end))
                                return 0;
                        /* Failure to split is bad, we at least
                         * restore the block before erroring
                         */
                        rgn->size = rend - rgn->base;
                        WARN_ON(1);
                        return -1;
                }

                /* Check if we need to trim the bottom of a block */
                if (rgn->base < end && rend > end) {
                        rgn->size -= end - rgn->base;
                        rgn->base = end;
                        break;
                }

                /* And check if we need to trim the top of a block */
                if (base < rend)
                        rgn->size -= rend - base;

        }
        return 0;
}

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

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

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

long __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",
                     base, base + size, (void *)_RET_IP_);
        BUG_ON(0 == size);

        return memblock_add_region(_rgn, base, size);
}

/**
 * __next_free_mem_range - next function for for_each_free_mem_range()
 * @idx: pointer to u64 loop variable
 * @nid: nid: node selector, %MAX_NUMNODES for all nodes
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 *
 * Find the first free area from *@idx which matches @nid, fill the out
 * parameters, and update *@idx for the next iteration.  The lower 32bit of
 * *@idx contains index into memory region and the upper 32bit indexes the
 * areas before each reserved region.  For example, if reserved regions
 * look like the following,
 *
 *      0:[0-16), 1:[32-48), 2:[128-130)
 *
 * The upper 32bit indexes the following regions.
 *
 *      0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX)
 *
 * As both region arrays are sorted, the function advances the two indices
 * in lockstep and returns each intersection.
 */
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;

                /* only memory regions are associated with nodes, check it */
                if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
                        continue;

                /* scan areas before each reservation for intersection */
                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 ri advanced past mi, break out to advance mi */
                        if (r_start >= m_end)
                                break;
                        /* if the two regions intersect, we're done */
                        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);
                                /*
                                 * The region which ends first is advanced
                                 * for the next iteration.
                                 */
                                if (m_end <= r_end)
                                        mi++;
                                else
                                        ri++;
                                *idx = (u32)mi | (u64)ri << 32;
                                return;
                        }
                }
        }

        /* signal end of iteration */
        *idx = ULLONG_MAX;
}

#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
 * Common iterator interface used to define for_each_mem_range().
 */
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;
}

/**
 * memblock_set_node - set node ID on memblock regions
 * @base: base of area to set node ID for
 * @size: size of area to set node ID for
 * @nid: node ID to set
 *
 * Set the nid of memblock memory regions in [@base,@base+@size) to @nid.
 * Regions which cross the area boundaries are split as necessary.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
                                      int nid)
{
        struct memblock_type *type = &memblock.memory;
        phys_addr_t end = base + size;
        int i;

        /* we'll create at most two more regions */
        while (type->cnt + 2 > type->max)
                if (memblock_double_array(type) < 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 intersects from below.  Split and continue
                         * to process the next region - the new top half.
                         */
                        rgn->base = base;
                        rgn->size = rend - rgn->base;
                        memblock_insert_region(type, i, rbase, base - rbase,
                                               rgn->nid);
                } else if (rend > end) {
                        /*
                         * @rgn intersects from above.  Split and redo the
                         * current region - the new bottom half.
                         */
                        rgn->base = end;
                        rgn->size = rend - rgn->base;
                        memblock_insert_region(type, i--, rbase, end - rbase,
                                               rgn->nid);
                } else {
                        /* @rgn is fully contained, set ->nid */
                        rgn->nid = nid;
                }
        }

        memblock_merge_regions(type);
        return 0;
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */

phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
        phys_addr_t found;

        /* We align the size to limit fragmentation. Without this, a lot of
         * small allocs quickly eat up the whole reserve array on sparc
         */
        size = round_up(size, align);

        found = memblock_find_in_range(0, max_addr, size, align);
        if (found && !memblock_add_region(&memblock.reserved, found, size))
                return found;

        return 0;
}

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);
}


/*
 * Additional node-local top-down allocators.
 *
 * WARNING: Only available after early_node_map[] has been populated,
 * on some architectures, that is after all the calls to add_active_range()
 * have been done to populate it.
 */

static phys_addr_t __init memblock_nid_range_rev(phys_addr_t start,
                                                 phys_addr_t end, int *nid)
{
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
        unsigned long start_pfn, end_pfn;
        int i;

        for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, nid)
                if (end > PFN_PHYS(start_pfn) && end <= PFN_PHYS(end_pfn))
                        return max(start, PFN_PHYS(start_pfn));
#endif
        *nid = 0;
        return start;
}

phys_addr_t __init memblock_find_in_range_node(phys_addr_t start,
                                               phys_addr_t end,
                                               phys_addr_t size,
                                               phys_addr_t align, int nid)
{
        struct memblock_type *mem = &memblock.memory;
        int i;

        BUG_ON(0 == size);

        /* Pump up max_addr */
        if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
                end = memblock.current_limit;

        for (i = mem->cnt - 1; i >= 0; i--) {
                struct memblock_region *r = &mem->regions[i];
                phys_addr_t base = max(start, r->base);
                phys_addr_t top = min(end, r->base + r->size);

                while (base < top) {
                        phys_addr_t tbase, ret;
                        int tnid;

                        tbase = memblock_nid_range_rev(base, top, &tnid);
                        if (nid == MAX_NUMNODES || tnid == nid) {
                                ret = memblock_find_region(tbase, top, size, align);
                                if (ret)
                                        return ret;
                        }
                        top = tbase;
                }
        }

        return 0;
}

phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
        phys_addr_t found;

        /*
         * We align the size to limit fragmentation. Without this, a lot of
         * small allocs quickly eat up the whole reserve array on sparc
         */
        size = round_up(size, align);

        found = memblock_find_in_range_node(0, MEMBLOCK_ALLOC_ACCESSIBLE,
                                            size, align, nid);
        if (found && !memblock_add_region(&memblock.reserved, found, size))
                return found;

        return 0;
}

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);
}


/*
 * Remaining API functions
 */

/* You must call memblock_analyze() before this. */
phys_addr_t __init memblock_phys_mem_size(void)
{
        return memblock.memory_size;
}

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);
}

/* You must call memblock_analyze() after this. */
void __init memblock_enforce_memory_limit(phys_addr_t memory_limit)
{
        unsigned long i;
        phys_addr_t limit;
        struct memblock_region *p;

        if (!memory_limit)
                return;

        /* Truncate the memblock regions to satisfy the memory limit. */
        limit = memory_limit;
        for (i = 0; i < memblock.memory.cnt; i++) {
                if (limit > memblock.memory.regions[i].size) {
                        limit -= memblock.memory.regions[i].size;
                        continue;
                }

                memblock.memory.regions[i].size = limit;
                memblock.memory.cnt = i + 1;
                break;
        }

        memory_limit = memblock_end_of_DRAM();

        /* And truncate any reserves above the limit also. */
        for (i = 0; i < memblock.reserved.cnt; i++) {
                p = &memblock.reserved.regions[i];

                if (p->base > memory_limit)
                        p->size = 0;
                else if ((p->base + p->size) > memory_limit)
                        p->size = memory_limit - p->base;

                if (p->size == 0) {
                        memblock_remove_region(&memblock.reserved, i);
                        i--;
                }
        }
}

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);

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

int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t 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)
{
        if (!memblock_debug)
                return;

        pr_info("MEMBLOCK configuration:\n");
        pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);

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

void __init memblock_analyze(void)
{
        int i;

        /* Check marker in the unused last array entry */
        WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
                != (phys_addr_t)RED_INACTIVE);
        WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
                != (phys_addr_t)RED_INACTIVE);

        memblock.memory_size = 0;

        for (i = 0; i < memblock.memory.cnt; i++)
                memblock.memory_size += memblock.memory.regions[i].size;

        /* We allow resizing from there */
        memblock_can_resize = 1;
}

void __init memblock_init(void)
{
        static int init_done __initdata = 0;

        if (init_done)
                return;
        init_done = 1;

        /* Hookup the initial arrays */
        memblock.memory.regions = memblock_memory_init_regions;
        memblock.memory.max             = INIT_MEMBLOCK_REGIONS;
        memblock.reserved.regions       = memblock_reserved_init_regions;
        memblock.reserved.max   = INIT_MEMBLOCK_REGIONS;

        /* Write a marker in the unused last array entry */
        memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
        memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;

        /* Create a dummy zero size MEMBLOCK which will get coalesced away later.
         * This simplifies the memblock_add() code below...
         */
        memblock.memory.regions[0].base = 0;
        memblock.memory.regions[0].size = 0;
        memblock_set_region_node(&memblock.memory.regions[0], MAX_NUMNODES);
        memblock.memory.cnt = 1;

        /* Ditto. */
        memblock.reserved.regions[0].base = 0;
        memblock.reserved.regions[0].size = 0;
        memblock_set_region_node(&memblock.reserved.regions[0], MAX_NUMNODES);
        memblock.reserved.cnt = 1;

        memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
}

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 /* CONFIG_DEBUG_FS */