![Tejun Heo](/assets/img/avatar_default.png)
memblock_init() initializes arrays for regions and memblock itself; however, all these can be done with struct initializers and memblock_init() can be removed. This patch kills memblock_init() and initializes memblock with struct initializer. The only difference is that the first dummy entries don't have .nid set to MAX_NUMNODES initially. This doesn't cause any behavior difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Michal Simek <monstr@monstr.eu> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: "H. Peter Anvin" <hpa@zytor.com>
991 lines
26 KiB
C
991 lines
26 KiB
C
/*
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* Procedures for maintaining information about logical memory blocks.
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*
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* Peter Bergner, IBM Corp. June 2001.
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* Copyright (C) 2001 Peter Bergner.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/poison.h>
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#include <linux/pfn.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/memblock.h>
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static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
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static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
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struct memblock memblock __initdata_memblock = {
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.memory.regions = memblock_memory_init_regions,
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.memory.cnt = 1, /* empty dummy entry */
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.memory.max = INIT_MEMBLOCK_REGIONS,
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.reserved.regions = memblock_reserved_init_regions,
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.reserved.cnt = 1, /* empty dummy entry */
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.reserved.max = INIT_MEMBLOCK_REGIONS,
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.current_limit = MEMBLOCK_ALLOC_ANYWHERE,
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};
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int memblock_debug __initdata_memblock;
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int memblock_can_resize __initdata_memblock;
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/* inline so we don't get a warning when pr_debug is compiled out */
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static inline const char *memblock_type_name(struct memblock_type *type)
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{
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if (type == &memblock.memory)
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return "memory";
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else if (type == &memblock.reserved)
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return "reserved";
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else
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return "unknown";
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}
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/*
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* Address comparison utilities
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*/
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static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
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phys_addr_t base2, phys_addr_t size2)
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{
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return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
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}
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static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
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phys_addr_t base, phys_addr_t size)
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{
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unsigned long i;
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for (i = 0; i < type->cnt; i++) {
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phys_addr_t rgnbase = type->regions[i].base;
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phys_addr_t rgnsize = type->regions[i].size;
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if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
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break;
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}
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return (i < type->cnt) ? i : -1;
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}
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/*
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* Find, allocate, deallocate or reserve unreserved regions. All allocations
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* are top-down.
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*/
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static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
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phys_addr_t size, phys_addr_t align)
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{
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phys_addr_t base, res_base;
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long j;
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/* In case, huge size is requested */
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if (end < size)
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return 0;
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base = round_down(end - size, align);
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/* Prevent allocations returning 0 as it's also used to
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* indicate an allocation failure
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*/
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if (start == 0)
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start = PAGE_SIZE;
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while (start <= base) {
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j = memblock_overlaps_region(&memblock.reserved, base, size);
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if (j < 0)
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return base;
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res_base = memblock.reserved.regions[j].base;
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if (res_base < size)
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break;
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base = round_down(res_base - size, align);
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}
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return 0;
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}
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/*
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* Find a free area with specified alignment in a specific range.
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*/
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phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, phys_addr_t end,
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phys_addr_t size, phys_addr_t align)
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{
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long i;
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BUG_ON(0 == size);
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/* Pump up max_addr */
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if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
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end = memblock.current_limit;
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/* We do a top-down search, this tends to limit memory
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* fragmentation by keeping early boot allocs near the
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* top of memory
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*/
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for (i = memblock.memory.cnt - 1; i >= 0; i--) {
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phys_addr_t memblockbase = memblock.memory.regions[i].base;
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phys_addr_t memblocksize = memblock.memory.regions[i].size;
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phys_addr_t bottom, top, found;
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if (memblocksize < size)
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continue;
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if ((memblockbase + memblocksize) <= start)
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break;
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bottom = max(memblockbase, start);
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top = min(memblockbase + memblocksize, end);
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if (bottom >= top)
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continue;
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found = memblock_find_region(bottom, top, size, align);
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if (found)
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return found;
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}
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return 0;
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}
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/*
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* Free memblock.reserved.regions
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*/
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int __init_memblock memblock_free_reserved_regions(void)
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{
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if (memblock.reserved.regions == memblock_reserved_init_regions)
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return 0;
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return memblock_free(__pa(memblock.reserved.regions),
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sizeof(struct memblock_region) * memblock.reserved.max);
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}
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/*
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* Reserve memblock.reserved.regions
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*/
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int __init_memblock memblock_reserve_reserved_regions(void)
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{
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if (memblock.reserved.regions == memblock_reserved_init_regions)
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return 0;
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return memblock_reserve(__pa(memblock.reserved.regions),
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sizeof(struct memblock_region) * memblock.reserved.max);
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}
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static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
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{
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memmove(&type->regions[r], &type->regions[r + 1],
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(type->cnt - (r + 1)) * sizeof(type->regions[r]));
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type->cnt--;
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/* Special case for empty arrays */
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if (type->cnt == 0) {
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type->cnt = 1;
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type->regions[0].base = 0;
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type->regions[0].size = 0;
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memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
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}
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}
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static int __init_memblock memblock_double_array(struct memblock_type *type)
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{
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struct memblock_region *new_array, *old_array;
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phys_addr_t old_size, new_size, addr;
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int use_slab = slab_is_available();
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/* We don't allow resizing until we know about the reserved regions
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* of memory that aren't suitable for allocation
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*/
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if (!memblock_can_resize)
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return -1;
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/* Calculate new doubled size */
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old_size = type->max * sizeof(struct memblock_region);
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new_size = old_size << 1;
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/* Try to find some space for it.
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*
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* WARNING: We assume that either slab_is_available() and we use it or
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* we use MEMBLOCK for allocations. That means that this is unsafe to use
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* when bootmem is currently active (unless bootmem itself is implemented
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* on top of MEMBLOCK which isn't the case yet)
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*
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* This should however not be an issue for now, as we currently only
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* call into MEMBLOCK while it's still active, or much later when slab is
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* active for memory hotplug operations
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*/
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if (use_slab) {
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new_array = kmalloc(new_size, GFP_KERNEL);
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addr = new_array ? __pa(new_array) : 0;
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} else
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addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t));
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if (!addr) {
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pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
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memblock_type_name(type), type->max, type->max * 2);
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return -1;
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}
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new_array = __va(addr);
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memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]",
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memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1);
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/* Found space, we now need to move the array over before
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* we add the reserved region since it may be our reserved
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* array itself that is full.
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*/
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memcpy(new_array, type->regions, old_size);
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memset(new_array + type->max, 0, old_size);
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old_array = type->regions;
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type->regions = new_array;
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type->max <<= 1;
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/* If we use SLAB that's it, we are done */
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if (use_slab)
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return 0;
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/* Add the new reserved region now. Should not fail ! */
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BUG_ON(memblock_reserve(addr, new_size));
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/* If the array wasn't our static init one, then free it. We only do
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* that before SLAB is available as later on, we don't know whether
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* to use kfree or free_bootmem_pages(). Shouldn't be a big deal
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* anyways
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*/
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if (old_array != memblock_memory_init_regions &&
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old_array != memblock_reserved_init_regions)
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memblock_free(__pa(old_array), old_size);
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return 0;
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}
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/**
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* memblock_merge_regions - merge neighboring compatible regions
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* @type: memblock type to scan
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*
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* Scan @type and merge neighboring compatible regions.
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*/
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static void __init_memblock memblock_merge_regions(struct memblock_type *type)
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{
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int i = 0;
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/* cnt never goes below 1 */
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while (i < type->cnt - 1) {
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struct memblock_region *this = &type->regions[i];
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struct memblock_region *next = &type->regions[i + 1];
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if (this->base + this->size != next->base ||
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memblock_get_region_node(this) !=
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memblock_get_region_node(next)) {
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BUG_ON(this->base + this->size > next->base);
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i++;
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continue;
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}
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this->size += next->size;
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memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next));
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type->cnt--;
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}
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}
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/**
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* memblock_insert_region - insert new memblock region
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* @type: memblock type to insert into
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* @idx: index for the insertion point
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* @base: base address of the new region
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* @size: size of the new region
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*
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* Insert new memblock region [@base,@base+@size) into @type at @idx.
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* @type must already have extra room to accomodate the new region.
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*/
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static void __init_memblock memblock_insert_region(struct memblock_type *type,
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int idx, phys_addr_t base,
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phys_addr_t size, int nid)
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{
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struct memblock_region *rgn = &type->regions[idx];
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BUG_ON(type->cnt >= type->max);
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memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn));
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rgn->base = base;
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rgn->size = size;
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memblock_set_region_node(rgn, nid);
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type->cnt++;
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}
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/**
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* memblock_add_region - add new memblock region
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* @type: memblock type to add new region into
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* @base: base address of the new region
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* @size: size of the new region
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*
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* Add new memblock region [@base,@base+@size) into @type. The new region
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* is allowed to overlap with existing ones - overlaps don't affect already
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* existing regions. @type is guaranteed to be minimal (all neighbouring
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* compatible regions are merged) after the addition.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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static int __init_memblock memblock_add_region(struct memblock_type *type,
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phys_addr_t base, phys_addr_t size)
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{
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bool insert = false;
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phys_addr_t obase = base, end = base + size;
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int i, nr_new;
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/* special case for empty array */
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if (type->regions[0].size == 0) {
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WARN_ON(type->cnt != 1);
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type->regions[0].base = base;
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type->regions[0].size = size;
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memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
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return 0;
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}
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repeat:
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/*
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* The following is executed twice. Once with %false @insert and
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* then with %true. The first counts the number of regions needed
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* to accomodate the new area. The second actually inserts them.
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*/
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base = obase;
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nr_new = 0;
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for (i = 0; i < type->cnt; i++) {
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struct memblock_region *rgn = &type->regions[i];
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phys_addr_t rbase = rgn->base;
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phys_addr_t rend = rbase + rgn->size;
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if (rbase >= end)
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break;
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if (rend <= base)
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continue;
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/*
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* @rgn overlaps. If it separates the lower part of new
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* area, insert that portion.
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*/
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if (rbase > base) {
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nr_new++;
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if (insert)
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memblock_insert_region(type, i++, base,
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rbase - base, MAX_NUMNODES);
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}
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/* area below @rend is dealt with, forget about it */
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base = min(rend, end);
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}
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/* insert the remaining portion */
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if (base < end) {
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nr_new++;
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if (insert)
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memblock_insert_region(type, i, base, end - base,
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MAX_NUMNODES);
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}
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/*
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* If this was the first round, resize array and repeat for actual
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* insertions; otherwise, merge and return.
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*/
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if (!insert) {
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while (type->cnt + nr_new > type->max)
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if (memblock_double_array(type) < 0)
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return -ENOMEM;
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insert = true;
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goto repeat;
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} else {
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memblock_merge_regions(type);
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return 0;
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}
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}
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int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
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{
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return memblock_add_region(&memblock.memory, base, size);
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}
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static int __init_memblock __memblock_remove(struct memblock_type *type,
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phys_addr_t base, phys_addr_t size)
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{
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phys_addr_t end = base + size;
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int i;
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/* Walk through the array for collisions */
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for (i = 0; i < type->cnt; i++) {
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struct memblock_region *rgn = &type->regions[i];
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phys_addr_t rend = rgn->base + rgn->size;
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/* Nothing more to do, exit */
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if (rgn->base > end || rgn->size == 0)
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break;
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/* If we fully enclose the block, drop it */
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if (base <= rgn->base && end >= rend) {
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memblock_remove_region(type, i--);
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continue;
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}
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/* If we are fully enclosed within a block
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* then we need to split it and we are done
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*/
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if (base > rgn->base && end < rend) {
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rgn->size = base - rgn->base;
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if (!memblock_add_region(type, end, rend - end))
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return 0;
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/* Failure to split is bad, we at least
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* restore the block before erroring
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*/
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rgn->size = rend - rgn->base;
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WARN_ON(1);
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return -1;
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}
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/* Check if we need to trim the bottom of a block */
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if (rgn->base < end && rend > end) {
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rgn->size -= end - rgn->base;
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rgn->base = end;
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break;
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}
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/* And check if we need to trim the top of a block */
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if (base < rend)
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rgn->size -= rend - base;
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}
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return 0;
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}
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int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
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{
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return __memblock_remove(&memblock.memory, base, size);
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}
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int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
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{
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memblock_dbg(" memblock_free: [%#016llx-%#016llx] %pF\n",
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(unsigned long long)base,
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(unsigned long long)base + size,
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(void *)_RET_IP_);
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return __memblock_remove(&memblock.reserved, base, size);
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}
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int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
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{
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struct memblock_type *_rgn = &memblock.reserved;
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memblock_dbg("memblock_reserve: [%#016llx-%#016llx] %pF\n",
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(unsigned long long)base,
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(unsigned long long)base + size,
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(void *)_RET_IP_);
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BUG_ON(0 == size);
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return memblock_add_region(_rgn, base, size);
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}
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/**
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* __next_free_mem_range - next function for for_each_free_mem_range()
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* @idx: pointer to u64 loop variable
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* @nid: nid: node selector, %MAX_NUMNODES for all nodes
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* @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
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* @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
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* @p_nid: ptr to int for nid of the range, can be %NULL
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*
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* Find the first free area from *@idx which matches @nid, fill the out
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* parameters, and update *@idx for the next iteration. The lower 32bit of
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* *@idx contains index into memory region and the upper 32bit indexes the
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* areas before each reserved region. For example, if reserved regions
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* 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_reserve(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_reserve(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;
|
|
}
|
|
|
|
/* lowest address */
|
|
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);
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
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 */
|