mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 14:30:50 +00:00
ebb1951d36
The idea of the implementation of this fix is from Michael Ellerman. This function has two loops, but they each interpret the memory_limit value differently. The first loop interprets it as a "size limit" whereas the second loop interprets it as an "address limit". Before the second loop runs, reset memory_limit to lmb_end_of_DRAM() so that it all works out. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Michael Ellerman <michael@ellerman.id.au>
528 lines
12 KiB
C
528 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/lmb.h>
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#define LMB_ALLOC_ANYWHERE 0
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struct lmb lmb;
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static int lmb_debug;
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static int __init early_lmb(char *p)
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{
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if (p && strstr(p, "debug"))
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lmb_debug = 1;
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return 0;
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}
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early_param("lmb", early_lmb);
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void lmb_dump_all(void)
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{
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unsigned long i;
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if (!lmb_debug)
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return;
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pr_info("lmb_dump_all:\n");
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pr_info(" memory.cnt = 0x%lx\n", lmb.memory.cnt);
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pr_info(" memory.size = 0x%llx\n",
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(unsigned long long)lmb.memory.size);
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for (i=0; i < lmb.memory.cnt ;i++) {
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pr_info(" memory.region[0x%lx].base = 0x%llx\n",
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i, (unsigned long long)lmb.memory.region[i].base);
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pr_info(" .size = 0x%llx\n",
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(unsigned long long)lmb.memory.region[i].size);
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}
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pr_info(" reserved.cnt = 0x%lx\n", lmb.reserved.cnt);
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pr_info(" reserved.size = 0x%llx\n",
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(unsigned long long)lmb.memory.size);
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for (i=0; i < lmb.reserved.cnt ;i++) {
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pr_info(" reserved.region[0x%lx].base = 0x%llx\n",
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i, (unsigned long long)lmb.reserved.region[i].base);
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pr_info(" .size = 0x%llx\n",
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(unsigned long long)lmb.reserved.region[i].size);
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}
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}
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static unsigned long lmb_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 lmb_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 lmb_regions_adjacent(struct lmb_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 lmb_addrs_adjacent(base1, size1, base2, size2);
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}
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static void lmb_remove_region(struct lmb_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 lmb_coalesce_regions(struct lmb_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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lmb_remove_region(rgn, r2);
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}
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void __init lmb_init(void)
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{
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/* Create a dummy zero size LMB which will get coalesced away later.
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* This simplifies the lmb_add() code below...
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*/
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lmb.memory.region[0].base = 0;
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lmb.memory.region[0].size = 0;
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lmb.memory.cnt = 1;
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/* Ditto. */
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lmb.reserved.region[0].base = 0;
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lmb.reserved.region[0].size = 0;
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lmb.reserved.cnt = 1;
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}
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void __init lmb_analyze(void)
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{
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int i;
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lmb.memory.size = 0;
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for (i = 0; i < lmb.memory.cnt; i++)
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lmb.memory.size += lmb.memory.region[i].size;
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}
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static long lmb_add_region(struct lmb_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 LMB 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 = lmb_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) && lmb_regions_adjacent(rgn, i, i+1)) {
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lmb_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_LMB_REGIONS)
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return -1;
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/* Couldn't coalesce the LMB, 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 lmb_add(u64 base, u64 size)
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{
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struct lmb_region *_rgn = &lmb.memory;
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/* On pSeries LPAR systems, the first LMB is our RMO region. */
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if (base == 0)
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lmb.rmo_size = size;
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return lmb_add_region(_rgn, base, size);
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}
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long lmb_remove(u64 base, u64 size)
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{
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struct lmb_region *rgn = &(lmb.memory);
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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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lmb_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 lmb_add_region(rgn, end, rgnend - end);
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}
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long __init lmb_reserve(u64 base, u64 size)
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{
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struct lmb_region *_rgn = &lmb.reserved;
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BUG_ON(0 == size);
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return lmb_add_region(_rgn, base, size);
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}
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long __init lmb_overlaps_region(struct lmb_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 (lmb_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 lmb_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 lmb_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 lmb_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 = lmb_align_down((end - size), align);
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while (start <= base) {
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j = lmb_overlaps_region(&lmb.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 (lmb_add_region(&lmb.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 = lmb.reserved.region[j].base;
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if (res_base < size)
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break;
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base = lmb_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 lmb_alloc_nid_region(struct lmb_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 = lmb_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 = lmb_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 lmb_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 lmb_region *mem = &lmb.memory;
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int i;
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BUG_ON(0 == size);
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size = lmb_align_up(size, align);
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for (i = 0; i < mem->cnt; i++) {
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u64 ret = lmb_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 lmb_alloc(size, align);
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}
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u64 __init lmb_alloc(u64 size, u64 align)
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{
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return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
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}
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u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr)
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{
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u64 alloc;
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alloc = __lmb_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 __lmb_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 = lmb_align_up(size, align);
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/* On some platforms, make sure we allocate lowmem */
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/* Note that LMB_REAL_LIMIT may be LMB_ALLOC_ANYWHERE */
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if (max_addr == LMB_ALLOC_ANYWHERE)
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max_addr = LMB_REAL_LIMIT;
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for (i = lmb.memory.cnt - 1; i >= 0; i--) {
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u64 lmbbase = lmb.memory.region[i].base;
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u64 lmbsize = lmb.memory.region[i].size;
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if (lmbsize < size)
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continue;
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if (max_addr == LMB_ALLOC_ANYWHERE)
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base = lmb_align_down(lmbbase + lmbsize - size, align);
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else if (lmbbase < max_addr) {
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base = min(lmbbase + lmbsize, max_addr);
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base = lmb_align_down(base - size, align);
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} else
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continue;
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while (base && lmbbase <= base) {
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j = lmb_overlaps_region(&lmb.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 (lmb_add_region(&lmb.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 = lmb.reserved.region[j].base;
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if (res_base < size)
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break;
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base = lmb_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 lmb_analyze() before this. */
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u64 __init lmb_phys_mem_size(void)
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{
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return lmb.memory.size;
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}
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u64 __init lmb_end_of_DRAM(void)
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{
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int idx = lmb.memory.cnt - 1;
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return (lmb.memory.region[idx].base + lmb.memory.region[idx].size);
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}
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/* You must call lmb_analyze() after this. */
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void __init lmb_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 lmb_property *p;
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if (!memory_limit)
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return;
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/* Truncate the lmb regions to satisfy the memory limit. */
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limit = memory_limit;
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for (i = 0; i < lmb.memory.cnt; i++) {
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if (limit > lmb.memory.region[i].size) {
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limit -= lmb.memory.region[i].size;
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continue;
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}
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lmb.memory.region[i].size = limit;
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lmb.memory.cnt = i + 1;
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break;
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}
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if (lmb.memory.region[0].size < lmb.rmo_size)
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lmb.rmo_size = lmb.memory.region[0].size;
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memory_limit = lmb_end_of_DRAM();
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/* And truncate any reserves above the limit also. */
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for (i = 0; i < lmb.reserved.cnt; i++) {
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p = &lmb.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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lmb_remove_region(&lmb.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 lmb_is_reserved(u64 addr)
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{
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int i;
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for (i = 0; i < lmb.reserved.cnt; i++) {
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u64 upper = lmb.reserved.region[i].base +
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lmb.reserved.region[i].size - 1;
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if ((addr >= lmb.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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/*
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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 lmb_find(struct lmb_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 < lmb.memory.cnt; i++) {
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u64 start = lmb.memory.region[i].base;
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u64 end = start + lmb.memory.region[i].size - 1;
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if (start > rend)
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return -1;
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if ((end >= rstart) && (start < rend)) {
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/* 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;
|
|
}
|