forked from Minki/linux
bf23c51f1f
This is in preparation for having resizable arrays. Note that we still allocate one more than needed, this is unchanged from the previous implementation. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
535 lines
13 KiB
C
535 lines
13 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/init.h>
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#include <linux/bitops.h>
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#include <linux/memblock.h>
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struct memblock memblock;
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static int memblock_debug;
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static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1];
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static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1];
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static int __init early_memblock(char *p)
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{
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if (p && strstr(p, "debug"))
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memblock_debug = 1;
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return 0;
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}
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early_param("memblock", early_memblock);
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static void memblock_dump(struct memblock_type *region, char *name)
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{
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unsigned long long base, size;
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int i;
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pr_info(" %s.cnt = 0x%lx\n", name, region->cnt);
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for (i = 0; i < region->cnt; i++) {
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base = region->regions[i].base;
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size = region->regions[i].size;
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pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n",
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name, i, base, base + size - 1, size);
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}
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}
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void memblock_dump_all(void)
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{
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if (!memblock_debug)
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return;
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pr_info("MEMBLOCK configuration:\n");
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pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);
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memblock_dump(&memblock.memory, "memory");
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memblock_dump(&memblock.reserved, "reserved");
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}
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static unsigned long 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 memblock_addrs_adjacent(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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if (base2 == base1 + size1)
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return 1;
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else if (base1 == base2 + size2)
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return -1;
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return 0;
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}
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static long memblock_regions_adjacent(struct memblock_type *type,
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unsigned long r1, unsigned long r2)
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{
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phys_addr_t base1 = type->regions[r1].base;
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phys_addr_t size1 = type->regions[r1].size;
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phys_addr_t base2 = type->regions[r2].base;
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phys_addr_t size2 = type->regions[r2].size;
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return memblock_addrs_adjacent(base1, size1, base2, size2);
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}
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static void memblock_remove_region(struct memblock_type *type, unsigned long r)
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{
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unsigned long i;
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for (i = r; i < type->cnt - 1; i++) {
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type->regions[i].base = type->regions[i + 1].base;
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type->regions[i].size = type->regions[i + 1].size;
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}
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type->cnt--;
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}
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/* Assumption: base addr of region 1 < base addr of region 2 */
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static void memblock_coalesce_regions(struct memblock_type *type,
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unsigned long r1, unsigned long r2)
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{
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type->regions[r1].size += type->regions[r2].size;
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memblock_remove_region(type, r2);
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}
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void __init memblock_init(void)
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{
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/* Hookup the initial arrays */
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memblock.memory.regions = memblock_memory_init_regions;
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memblock.memory.max = INIT_MEMBLOCK_REGIONS;
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memblock.reserved.regions = memblock_reserved_init_regions;
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memblock.reserved.max = INIT_MEMBLOCK_REGIONS;
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/* Create a dummy zero size MEMBLOCK which will get coalesced away later.
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* This simplifies the memblock_add() code below...
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*/
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memblock.memory.regions[0].base = 0;
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memblock.memory.regions[0].size = 0;
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memblock.memory.cnt = 1;
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/* Ditto. */
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memblock.reserved.regions[0].base = 0;
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memblock.reserved.regions[0].size = 0;
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memblock.reserved.cnt = 1;
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memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
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}
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void __init memblock_analyze(void)
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{
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int i;
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memblock.memory_size = 0;
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for (i = 0; i < memblock.memory.cnt; i++)
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memblock.memory_size += memblock.memory.regions[i].size;
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}
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static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
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{
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unsigned long coalesced = 0;
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long adjacent, i;
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if ((type->cnt == 1) && (type->regions[0].size == 0)) {
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type->regions[0].base = base;
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type->regions[0].size = size;
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return 0;
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}
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/* First try and coalesce this MEMBLOCK with another. */
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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 ((rgnbase == base) && (rgnsize == size))
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/* Already have this region, so we're done */
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return 0;
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adjacent = memblock_addrs_adjacent(base, size, rgnbase, rgnsize);
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if (adjacent > 0) {
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type->regions[i].base -= size;
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type->regions[i].size += size;
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coalesced++;
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break;
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} else if (adjacent < 0) {
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type->regions[i].size += size;
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coalesced++;
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break;
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}
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}
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if ((i < type->cnt - 1) && memblock_regions_adjacent(type, i, i+1)) {
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memblock_coalesce_regions(type, i, i+1);
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coalesced++;
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}
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if (coalesced)
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return coalesced;
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if (type->cnt >= type->max)
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return -1;
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/* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */
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for (i = type->cnt - 1; i >= 0; i--) {
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if (base < type->regions[i].base) {
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type->regions[i+1].base = type->regions[i].base;
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type->regions[i+1].size = type->regions[i].size;
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} else {
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type->regions[i+1].base = base;
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type->regions[i+1].size = size;
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break;
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}
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}
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if (base < type->regions[0].base) {
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type->regions[0].base = base;
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type->regions[0].size = size;
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}
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type->cnt++;
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return 0;
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}
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long 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 long __memblock_remove(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
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{
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phys_addr_t rgnbegin, rgnend;
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phys_addr_t end = base + size;
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int i;
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rgnbegin = rgnend = 0; /* supress gcc warnings */
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/* Find the region where (base, size) belongs to */
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for (i=0; i < type->cnt; i++) {
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rgnbegin = type->regions[i].base;
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rgnend = rgnbegin + type->regions[i].size;
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if ((rgnbegin <= base) && (end <= rgnend))
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break;
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}
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/* Didn't find the region */
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if (i == type->cnt)
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return -1;
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/* Check to see if we are removing entire region */
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if ((rgnbegin == base) && (rgnend == end)) {
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memblock_remove_region(type, i);
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return 0;
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}
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/* Check to see if region is matching at the front */
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if (rgnbegin == base) {
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type->regions[i].base = end;
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type->regions[i].size -= size;
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return 0;
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}
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/* Check to see if the region is matching at the end */
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if (rgnend == end) {
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type->regions[i].size -= size;
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return 0;
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}
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/*
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* We need to split the entry - adjust the current one to the
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* beginging of the hole and add the region after hole.
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*/
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type->regions[i].size = base - type->regions[i].base;
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return memblock_add_region(type, end, rgnend - end);
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}
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long 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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long __init memblock_free(phys_addr_t base, phys_addr_t size)
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{
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return __memblock_remove(&memblock.reserved, base, size);
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}
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long __init 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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BUG_ON(0 == size);
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return memblock_add_region(_rgn, base, size);
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}
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long memblock_overlaps_region(struct memblock_type *type, 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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static phys_addr_t memblock_align_down(phys_addr_t addr, phys_addr_t size)
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{
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return addr & ~(size - 1);
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}
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static phys_addr_t memblock_align_up(phys_addr_t addr, phys_addr_t size)
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{
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return (addr + (size - 1)) & ~(size - 1);
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}
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static phys_addr_t __init memblock_alloc_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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base = memblock_align_down((end - size), align);
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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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/* this area isn't reserved, take it */
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if (memblock_add_region(&memblock.reserved, base, size) < 0)
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base = ~(phys_addr_t)0;
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return base;
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}
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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 = memblock_align_down(res_base - size, align);
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}
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return ~(phys_addr_t)0;
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}
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phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid)
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{
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*nid = 0;
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return end;
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}
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static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp,
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phys_addr_t size,
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phys_addr_t align, int nid)
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{
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phys_addr_t start, end;
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start = mp->base;
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end = start + mp->size;
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start = memblock_align_up(start, align);
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while (start < end) {
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phys_addr_t this_end;
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int this_nid;
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this_end = memblock_nid_range(start, end, &this_nid);
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if (this_nid == nid) {
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phys_addr_t ret = memblock_alloc_region(start, this_end, size, align);
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if (ret != ~(phys_addr_t)0)
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return ret;
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}
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start = this_end;
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}
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return ~(phys_addr_t)0;
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}
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phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
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{
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struct memblock_type *mem = &memblock.memory;
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int i;
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BUG_ON(0 == size);
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/* We do a bottom-up search for a region with the right
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* nid since that's easier considering how memblock_nid_range()
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* works
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*/
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size = memblock_align_up(size, align);
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for (i = 0; i < mem->cnt; i++) {
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phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i],
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size, align, nid);
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if (ret != ~(phys_addr_t)0)
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return ret;
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}
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return memblock_alloc(size, align);
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}
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phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
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{
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return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
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}
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phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
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{
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phys_addr_t alloc;
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alloc = __memblock_alloc_base(size, align, max_addr);
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if (alloc == 0)
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panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
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(unsigned long long) size, (unsigned long long) max_addr);
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return alloc;
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}
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phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
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{
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long i;
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phys_addr_t base = 0;
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phys_addr_t res_base;
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BUG_ON(0 == size);
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size = memblock_align_up(size, align);
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/* Pump up max_addr */
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if (max_addr == MEMBLOCK_ALLOC_ACCESSIBLE)
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max_addr = 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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if (memblocksize < size)
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continue;
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base = min(memblockbase + memblocksize, max_addr);
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res_base = memblock_alloc_region(memblockbase, base, size, align);
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if (res_base != ~(phys_addr_t)0)
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return res_base;
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}
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return 0;
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}
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/* You must call memblock_analyze() before this. */
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phys_addr_t __init memblock_phys_mem_size(void)
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{
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return memblock.memory_size;
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}
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phys_addr_t memblock_end_of_DRAM(void)
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{
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int idx = memblock.memory.cnt - 1;
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return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
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}
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/* You must call memblock_analyze() after this. */
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void __init memblock_enforce_memory_limit(phys_addr_t memory_limit)
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{
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unsigned long i;
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phys_addr_t limit;
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struct memblock_region *p;
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if (!memory_limit)
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return;
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/* Truncate the memblock regions to satisfy the memory limit. */
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limit = memory_limit;
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for (i = 0; i < memblock.memory.cnt; i++) {
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if (limit > memblock.memory.regions[i].size) {
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limit -= memblock.memory.regions[i].size;
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continue;
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}
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memblock.memory.regions[i].size = limit;
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memblock.memory.cnt = i + 1;
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break;
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}
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memory_limit = memblock_end_of_DRAM();
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/* And truncate any reserves above the limit also. */
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for (i = 0; i < memblock.reserved.cnt; i++) {
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p = &memblock.reserved.regions[i];
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if (p->base > memory_limit)
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p->size = 0;
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else if ((p->base + p->size) > memory_limit)
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p->size = memory_limit - p->base;
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if (p->size == 0) {
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memblock_remove_region(&memblock.reserved, i);
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i--;
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}
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}
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}
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static int memblock_search(struct memblock_type *type, phys_addr_t addr)
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{
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unsigned int left = 0, right = type->cnt;
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do {
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unsigned int mid = (right + left) / 2;
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if (addr < type->regions[mid].base)
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right = mid;
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else if (addr >= (type->regions[mid].base +
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type->regions[mid].size))
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left = mid + 1;
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else
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return mid;
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} while (left < right);
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return -1;
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}
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int __init memblock_is_reserved(phys_addr_t addr)
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{
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return memblock_search(&memblock.reserved, addr) != -1;
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}
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int memblock_is_memory(phys_addr_t addr)
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{
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return memblock_search(&memblock.memory, addr) != -1;
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}
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int memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
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{
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int idx = memblock_search(&memblock.reserved, base);
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if (idx == -1)
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return 0;
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return memblock.reserved.regions[idx].base <= base &&
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(memblock.reserved.regions[idx].base +
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memblock.reserved.regions[idx].size) >= (base + size);
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}
|
|
|
|
int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
|
|
{
|
|
return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
|
|
}
|
|
|
|
|
|
void __init memblock_set_current_limit(phys_addr_t limit)
|
|
{
|
|
memblock.current_limit = limit;
|
|
}
|
|
|