nobootmem.c

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/*
 *  bootmem - A boot-time physical memory allocator and configurator
 *
 *  Copyright (C) 1999 Ingo Molnar
 *                1999 Kanoj Sarcar, SGI
 *                2008 Johannes Weiner
 *
 * Access to this subsystem has to be serialized externally (which is true
 * for the boot process anyway).
 */
#include <linux/init.h>
#include <linux/pfn.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/kmemleak.h>
#include <linux/range.h>
#include <linux/memblock.h>

#include <asm/bug.h>
#include <asm/io.h>
#include <asm/processor.h>

#include "internal.h"

#ifndef CONFIG_NEED_MULTIPLE_NODES
struct pglist_data __refdata contig_page_data;
EXPORT_SYMBOL(contig_page_data);
#endif

unsigned long max_low_pfn;
unsigned long min_low_pfn;
unsigned long max_pfn;

static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
                    u64 goal, u64 limit)
{
    void *ptr;
    u64 addr;

    if (limit > memblock.current_limit)
        limit = memblock.current_limit;

    addr = memblock_find_in_range_node(goal, limit, size, align, nid);
    if (!addr)
        return NULL;

    ptr = phys_to_virt(addr);
    memset(ptr, 0, size);
    memblock_reserve(addr, size);
    /*
     * The min_count is set to 0 so that bootmem allocated blocks
     * are never reported as leaks.
     */
    kmemleak_alloc(ptr, size, 0, 0);
    return ptr;
}

/*
 * free_bootmem_late - free bootmem pages directly to page allocator
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * This is only useful when the bootmem allocator has already been torn
 * down, but we are still initializing the system.  Pages are given directly
 * to the page allocator, no bootmem metadata is updated because it is gone.
 */
void __init free_bootmem_late(unsigned long addr, unsigned long size)
{
    unsigned long cursor, end;

    kmemleak_free_part(__va(addr), size);

    cursor = PFN_UP(addr);
    end = PFN_DOWN(addr + size);

    for (; cursor < end; cursor++) {
        __free_pages_bootmem(pfn_to_page(cursor), 0);
        totalram_pages++;
    }
}

static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
    unsigned long i, start_aligned, end_aligned;
    int order = ilog2(BITS_PER_LONG);

    start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
    end_aligned = end & ~(BITS_PER_LONG - 1);

    if (end_aligned <= start_aligned) {
        for (i = start; i < end; i++)
            __free_pages_bootmem(pfn_to_page(i), 0);

        return;
    }

    for (i = start; i < start_aligned; i++)
        __free_pages_bootmem(pfn_to_page(i), 0);

    for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
        __free_pages_bootmem(pfn_to_page(i), order);

    for (i = end_aligned; i < end; i++)
        __free_pages_bootmem(pfn_to_page(i), 0);
}

static unsigned long __init __free_memory_core(phys_addr_t start,
                 phys_addr_t end)
{
    unsigned long start_pfn = PFN_UP(start);
    unsigned long end_pfn = min_t(unsigned long,
                      PFN_DOWN(end), max_low_pfn);

    if (start_pfn > end_pfn)
        return 0;

    __free_pages_memory(start_pfn, end_pfn);

    return end_pfn - start_pfn;
}

unsigned long __init free_low_memory_core_early(int nodeid)
{
    unsigned long count = 0;
    phys_addr_t start, end, size;
    u64 i;

    for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
        count += __free_memory_core(start, end);

    /* free range that is used for reserved array if we allocate it */
    size = get_allocated_memblock_reserved_regions_info(&start);
    if (size)
        count += __free_memory_core(start, start + size);

    return count;
}

unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
{
    register_page_bootmem_info_node(pgdat);

    /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
    return 0;
}

unsigned long __init free_all_bootmem(void)
{
    /*
     * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
     *  because in some case like Node0 doesn't have RAM installed
     *  low ram will be on Node1
     */
    return free_low_memory_core_early(MAX_NUMNODES);
}

void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
                  unsigned long size)
{
    kmemleak_free_part(__va(physaddr), size);
    memblock_free(physaddr, size);
}

void __init free_bootmem(unsigned long addr, unsigned long size)
{
    kmemleak_free_part(__va(addr), size);
    memblock_free(addr, size);
}

static void * __init ___alloc_bootmem_nopanic(unsigned long size,
                    unsigned long align,
                    unsigned long goal,
                    unsigned long limit)
{
    void *ptr;

    if (WARN_ON_ONCE(slab_is_available()))
        return kzalloc(size, GFP_NOWAIT);

restart:

    ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);

    if (ptr)
        return ptr;

    if (goal != 0) {
        goal = 0;
        goto restart;
    }

    return NULL;
}

void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
                    unsigned long goal)
{
    unsigned long limit = -1UL;

    return ___alloc_bootmem_nopanic(size, align, goal, limit);
}

static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
                    unsigned long goal, unsigned long limit)
{
    void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);

    if (mem)
        return mem;
    /*
     * Whoops, we cannot satisfy the allocation request.
     */
    printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
    panic("Out of memory");
    return NULL;
}

void * __init __alloc_bootmem(unsigned long size, unsigned long align,
                  unsigned long goal)
{
    unsigned long limit = -1UL;

    return ___alloc_bootmem(size, align, goal, limit);
}

void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
                           unsigned long size,
                           unsigned long align,
                           unsigned long goal,
                           unsigned long limit)
{
    void *ptr;

again:
    ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
                    goal, limit);
    if (ptr)
        return ptr;

    ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
                    goal, limit);
    if (ptr)
        return ptr;

    if (goal) {
        goal = 0;
        goto again;
    }

    return NULL;
}

void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
                   unsigned long align, unsigned long goal)
{
    if (WARN_ON_ONCE(slab_is_available()))
        return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

    return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
}

void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
                    unsigned long align, unsigned long goal,
                    unsigned long limit)
{
    void *ptr;

    ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
    if (ptr)
        return ptr;

    printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
    panic("Out of memory");
    return NULL;
}

void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
                   unsigned long align, unsigned long goal)
{
    if (WARN_ON_ONCE(slab_is_available()))
        return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

    return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
}

void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
                   unsigned long align, unsigned long goal)
{
    return __alloc_bootmem_node(pgdat, size, align, goal);
}

#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
#endif

void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
                  unsigned long goal)
{
    return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
}

void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
                       unsigned long align, unsigned long goal)
{
    if (WARN_ON_ONCE(slab_is_available()))
        return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

    return ___alloc_bootmem_node(pgdat, size, align, goal,
                     ARCH_LOW_ADDRESS_LIMIT);
}