mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 20:42:39 +00:00
2ed9aae0fa
All callers expect a boolean result which is true if the region overlaps a reserved region. However, the implementation actually returns -1 if there is no overlap, and a region index (0 based) if there is. Make it behave as callers (and common sense) expect. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
542 lines
12 KiB
C
542 lines
12 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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#define MEMBLOCK_ALLOC_ANYWHERE 0
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struct memblock memblock;
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static int memblock_debug;
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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_region *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->region[i].base;
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size = region->region[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(" rmo_size = 0x%llx\n", (unsigned long long)memblock.rmo_size);
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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(u64 base1, u64 size1, u64 base2,
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u64 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(u64 base1, u64 size1, u64 base2, u64 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_region *rgn,
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unsigned long r1, unsigned long r2)
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{
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u64 base1 = rgn->region[r1].base;
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u64 size1 = rgn->region[r1].size;
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u64 base2 = rgn->region[r2].base;
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u64 size2 = rgn->region[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_region *rgn, unsigned long r)
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{
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unsigned long i;
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for (i = r; i < rgn->cnt - 1; i++) {
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rgn->region[i].base = rgn->region[i + 1].base;
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rgn->region[i].size = rgn->region[i + 1].size;
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}
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rgn->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_region *rgn,
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unsigned long r1, unsigned long r2)
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{
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rgn->region[r1].size += rgn->region[r2].size;
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memblock_remove_region(rgn, r2);
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}
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void __init memblock_init(void)
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{
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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.region[0].base = 0;
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memblock.memory.region[0].size = 0;
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memblock.memory.cnt = 1;
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/* Ditto. */
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memblock.reserved.region[0].base = 0;
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memblock.reserved.region[0].size = 0;
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memblock.reserved.cnt = 1;
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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.region[i].size;
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}
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static long memblock_add_region(struct memblock_region *rgn, u64 base, u64 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 ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
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rgn->region[0].base = base;
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rgn->region[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 < rgn->cnt; i++) {
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u64 rgnbase = rgn->region[i].base;
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u64 rgnsize = rgn->region[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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rgn->region[i].base -= size;
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rgn->region[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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rgn->region[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 < rgn->cnt - 1) && memblock_regions_adjacent(rgn, i, i+1)) {
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memblock_coalesce_regions(rgn, 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 (rgn->cnt >= MAX_MEMBLOCK_REGIONS)
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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 = rgn->cnt - 1; i >= 0; i--) {
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if (base < rgn->region[i].base) {
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rgn->region[i+1].base = rgn->region[i].base;
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rgn->region[i+1].size = rgn->region[i].size;
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} else {
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rgn->region[i+1].base = base;
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rgn->region[i+1].size = size;
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break;
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}
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}
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if (base < rgn->region[0].base) {
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rgn->region[0].base = base;
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rgn->region[0].size = size;
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}
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rgn->cnt++;
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return 0;
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}
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long memblock_add(u64 base, u64 size)
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{
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struct memblock_region *_rgn = &memblock.memory;
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/* On pSeries LPAR systems, the first MEMBLOCK is our RMO region. */
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if (base == 0)
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memblock.rmo_size = size;
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return memblock_add_region(_rgn, base, size);
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}
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static long __memblock_remove(struct memblock_region *rgn, u64 base, u64 size)
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{
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u64 rgnbegin, rgnend;
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u64 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 < rgn->cnt; i++) {
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rgnbegin = rgn->region[i].base;
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rgnend = rgnbegin + rgn->region[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 == rgn->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(rgn, 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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rgn->region[i].base = end;
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rgn->region[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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rgn->region[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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rgn->region[i].size = base - rgn->region[i].base;
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return memblock_add_region(rgn, end, rgnend - end);
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}
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long memblock_remove(u64 base, u64 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(u64 base, u64 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(u64 base, u64 size)
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{
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struct memblock_region *_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_region *rgn, u64 base, u64 size)
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{
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unsigned long i;
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for (i = 0; i < rgn->cnt; i++) {
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u64 rgnbase = rgn->region[i].base;
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u64 rgnsize = rgn->region[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 < rgn->cnt) ? i : -1;
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}
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static u64 memblock_align_down(u64 addr, u64 size)
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{
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return addr & ~(size - 1);
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}
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static u64 memblock_align_up(u64 addr, u64 size)
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{
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return (addr + (size - 1)) & ~(size - 1);
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}
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static u64 __init memblock_alloc_nid_unreserved(u64 start, u64 end,
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u64 size, u64 align)
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{
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u64 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 = ~(u64)0;
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return base;
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}
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res_base = memblock.reserved.region[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 ~(u64)0;
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}
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static u64 __init memblock_alloc_nid_region(struct memblock_property *mp,
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u64 (*nid_range)(u64, u64, int *),
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u64 size, u64 align, int nid)
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{
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u64 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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u64 this_end;
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int this_nid;
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this_end = nid_range(start, end, &this_nid);
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if (this_nid == nid) {
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u64 ret = memblock_alloc_nid_unreserved(start, this_end,
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size, align);
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if (ret != ~(u64)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 ~(u64)0;
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}
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u64 __init memblock_alloc_nid(u64 size, u64 align, int nid,
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u64 (*nid_range)(u64 start, u64 end, int *nid))
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{
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struct memblock_region *mem = &memblock.memory;
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int i;
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BUG_ON(0 == size);
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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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u64 ret = memblock_alloc_nid_region(&mem->region[i],
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nid_range,
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size, align, nid);
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if (ret != ~(u64)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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u64 __init memblock_alloc(u64 size, u64 align)
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{
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return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
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}
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u64 __init memblock_alloc_base(u64 size, u64 align, u64 max_addr)
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{
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u64 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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u64 __init __memblock_alloc_base(u64 size, u64 align, u64 max_addr)
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{
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long i, j;
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u64 base = 0;
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u64 res_base;
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BUG_ON(0 == size);
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size = memblock_align_up(size, align);
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/* On some platforms, make sure we allocate lowmem */
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/* Note that MEMBLOCK_REAL_LIMIT may be MEMBLOCK_ALLOC_ANYWHERE */
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if (max_addr == MEMBLOCK_ALLOC_ANYWHERE)
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max_addr = MEMBLOCK_REAL_LIMIT;
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for (i = memblock.memory.cnt - 1; i >= 0; i--) {
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u64 memblockbase = memblock.memory.region[i].base;
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u64 memblocksize = memblock.memory.region[i].size;
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if (memblocksize < size)
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continue;
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if (max_addr == MEMBLOCK_ALLOC_ANYWHERE)
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base = memblock_align_down(memblockbase + memblocksize - size, align);
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else if (memblockbase < max_addr) {
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base = min(memblockbase + memblocksize, max_addr);
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base = memblock_align_down(base - size, align);
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} else
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continue;
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while (base && memblockbase <= 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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return 0;
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return base;
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}
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res_base = memblock.reserved.region[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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}
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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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u64 __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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u64 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.region[idx].base + memblock.memory.region[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(u64 memory_limit)
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{
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unsigned long i;
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u64 limit;
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struct memblock_property *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.region[i].size) {
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limit -= memblock.memory.region[i].size;
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continue;
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}
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memblock.memory.region[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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if (memblock.memory.region[0].size < memblock.rmo_size)
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memblock.rmo_size = memblock.memory.region[0].size;
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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.region[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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int __init memblock_is_reserved(u64 addr)
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{
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int i;
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for (i = 0; i < memblock.reserved.cnt; i++) {
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u64 upper = memblock.reserved.region[i].base +
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memblock.reserved.region[i].size - 1;
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if ((addr >= memblock.reserved.region[i].base) && (addr <= upper))
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return 1;
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}
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return 0;
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}
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int memblock_is_region_reserved(u64 base, u64 size)
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{
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return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
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}
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/*
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* Given a <base, len>, find which memory regions belong to this range.
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* Adjust the request and return a contiguous chunk.
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*/
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int memblock_find(struct memblock_property *res)
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{
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int i;
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u64 rstart, rend;
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rstart = res->base;
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rend = rstart + res->size - 1;
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for (i = 0; i < memblock.memory.cnt; i++) {
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u64 start = memblock.memory.region[i].base;
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u64 end = start + memblock.memory.region[i].size - 1;
|
|
|
|
if (start > rend)
|
|
return -1;
|
|
|
|
if ((end >= rstart) && (start < rend)) {
|
|
/* adjust the request */
|
|
if (rstart < start)
|
|
rstart = start;
|
|
if (rend > end)
|
|
rend = end;
|
|
res->base = rstart;
|
|
res->size = rend - rstart + 1;
|
|
return 0;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|