2babf5c2ec
We currently do mem= handling in three seperate places. And as benh pointed out I wrote two of them. Now that we parse command line parameters earlier we can clean this mess up. Moving the parsing out of prom_init means the device tree might be allocated above the memory limit. If that happens we'd have to move it. As it happens we already have logic to do that for kdump, so just genericise it. This also means we might have reserved regions above the memory limit, if we do the bootmem allocator will blow up, so we have to modify lmb_enforce_memory_limit() to truncate the reserves as well. Tested on P5 LPAR, iSeries, F50, 44p. Tested moving device tree on P5 and 44p and F50. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
341 lines
8 KiB
C
341 lines
8 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/config.h>
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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 <asm/types.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/lmb.h>
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#ifdef CONFIG_PPC32
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#include "mmu_decl.h" /* for __max_low_memory */
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#endif
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#undef DEBUG
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#ifdef DEBUG
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#include <asm/udbg.h>
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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#define LMB_ALLOC_ANYWHERE 0
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struct lmb lmb;
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void lmb_dump_all(void)
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{
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#ifdef DEBUG
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unsigned long i;
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DBG("lmb_dump_all:\n");
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DBG(" memory.cnt = 0x%lx\n", lmb.memory.cnt);
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DBG(" memory.size = 0x%lx\n", lmb.memory.size);
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for (i=0; i < lmb.memory.cnt ;i++) {
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DBG(" memory.region[0x%x].base = 0x%lx\n",
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i, lmb.memory.region[i].base);
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DBG(" .size = 0x%lx\n",
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lmb.memory.region[i].size);
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}
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DBG("\n reserved.cnt = 0x%lx\n", lmb.reserved.cnt);
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DBG(" reserved.size = 0x%lx\n", lmb.reserved.size);
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for (i=0; i < lmb.reserved.cnt ;i++) {
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DBG(" reserved.region[0x%x].base = 0x%lx\n",
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i, lmb.reserved.region[i].base);
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DBG(" .size = 0x%lx\n",
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lmb.reserved.region[i].size);
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}
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#endif /* DEBUG */
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}
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static unsigned long __init lmb_addrs_overlap(unsigned long base1,
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unsigned long size1, unsigned long base2, unsigned long size2)
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{
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return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
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}
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static long __init lmb_addrs_adjacent(unsigned long base1, unsigned long size1,
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unsigned long base2, unsigned long 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 __init 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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unsigned long base1 = rgn->region[r1].base;
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unsigned long size1 = rgn->region[r1].size;
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unsigned long base2 = rgn->region[r2].base;
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unsigned long 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 __init 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 __init 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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/* This routine called with relocation disabled. */
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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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/* This routine may be called with relocation disabled. */
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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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/* This routine called with relocation disabled. */
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static long __init lmb_add_region(struct lmb_region *rgn, unsigned long base,
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unsigned long size)
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{
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unsigned long i, coalesced = 0;
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long adjacent;
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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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unsigned long rgnbase = rgn->region[i].base;
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unsigned long rgnsize = rgn->region[i].size;
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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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}
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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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rgn->cnt++;
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return 0;
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}
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/* This routine may be called with relocation disabled. */
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long __init lmb_add(unsigned long base, unsigned long 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 __init lmb_reserve(unsigned long base, unsigned long 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, unsigned long base,
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unsigned long 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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unsigned long rgnbase = rgn->region[i].base;
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unsigned long 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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}
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return (i < rgn->cnt) ? i : -1;
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}
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unsigned long __init lmb_alloc(unsigned long size, unsigned long 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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unsigned long __init lmb_alloc_base(unsigned long size, unsigned long align,
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unsigned long max_addr)
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{
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unsigned long 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%lx bytes below 0x%lx.\n",
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size, max_addr);
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return alloc;
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}
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unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align,
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unsigned long max_addr)
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{
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long i, j;
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unsigned long base = 0;
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BUG_ON(0 == size);
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#ifdef CONFIG_PPC32
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/* On 32-bit, make sure we allocate lowmem */
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if (max_addr == LMB_ALLOC_ANYWHERE)
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max_addr = __max_low_memory;
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#endif
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for (i = lmb.memory.cnt-1; i >= 0; i--) {
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unsigned long lmbbase = lmb.memory.region[i].base;
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unsigned long lmbsize = lmb.memory.region[i].size;
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if (max_addr == LMB_ALLOC_ANYWHERE)
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base = _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 = _ALIGN_DOWN(base - size, align);
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} else
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continue;
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while ((lmbbase <= base) &&
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((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0) )
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base = _ALIGN_DOWN(lmb.reserved.region[j].base - size,
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align);
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if ((base != 0) && (lmbbase <= base))
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break;
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}
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if (i < 0)
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return 0;
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lmb_add_region(&lmb.reserved, base, size);
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return base;
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}
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/* You must call lmb_analyze() before this. */
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unsigned long __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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unsigned long __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(unsigned long memory_limit)
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{
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unsigned long i, 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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lmb.rmo_size = lmb.memory.region[0].size;
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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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