74b20dad1c
We introduced a bug in fixing lmb_add_region to handle an initial region being non-zero. Before that fix it was impossible to insert a region at the head of the list since the first region always started at zero. Now that its possible for the first region to be non-zero we need to check to see if the new region should be added at the head and if so actually add it. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: David S. Miller <davem@davemloft.net>
371 lines
8.4 KiB
C
371 lines
8.4 KiB
C
/*
|
|
* Procedures for maintaining information about logical memory blocks.
|
|
*
|
|
* Peter Bergner, IBM Corp. June 2001.
|
|
* Copyright (C) 2001 Peter Bergner.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/lmb.h>
|
|
|
|
#undef DEBUG
|
|
|
|
#ifdef DEBUG
|
|
#define DBG(fmt...) LMB_DBG(fmt)
|
|
#else
|
|
#define DBG(fmt...)
|
|
#endif
|
|
|
|
#define LMB_ALLOC_ANYWHERE 0
|
|
|
|
struct lmb lmb;
|
|
|
|
void lmb_dump_all(void)
|
|
{
|
|
#ifdef DEBUG
|
|
unsigned long i;
|
|
|
|
DBG("lmb_dump_all:\n");
|
|
DBG(" memory.cnt = 0x%lx\n", lmb.memory.cnt);
|
|
DBG(" memory.size = 0x%llx\n",
|
|
(unsigned long long)lmb.memory.size);
|
|
for (i=0; i < lmb.memory.cnt ;i++) {
|
|
DBG(" memory.region[0x%x].base = 0x%llx\n",
|
|
i, (unsigned long long)lmb.memory.region[i].base);
|
|
DBG(" .size = 0x%llx\n",
|
|
(unsigned long long)lmb.memory.region[i].size);
|
|
}
|
|
|
|
DBG("\n reserved.cnt = 0x%lx\n", lmb.reserved.cnt);
|
|
DBG(" reserved.size = 0x%lx\n", lmb.reserved.size);
|
|
for (i=0; i < lmb.reserved.cnt ;i++) {
|
|
DBG(" reserved.region[0x%x].base = 0x%llx\n",
|
|
i, (unsigned long long)lmb.reserved.region[i].base);
|
|
DBG(" .size = 0x%llx\n",
|
|
(unsigned long long)lmb.reserved.region[i].size);
|
|
}
|
|
#endif /* DEBUG */
|
|
}
|
|
|
|
static unsigned long __init lmb_addrs_overlap(u64 base1,
|
|
u64 size1, u64 base2, u64 size2)
|
|
{
|
|
return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
|
|
}
|
|
|
|
static long __init lmb_addrs_adjacent(u64 base1, u64 size1,
|
|
u64 base2, u64 size2)
|
|
{
|
|
if (base2 == base1 + size1)
|
|
return 1;
|
|
else if (base1 == base2 + size2)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long __init lmb_regions_adjacent(struct lmb_region *rgn,
|
|
unsigned long r1, unsigned long r2)
|
|
{
|
|
u64 base1 = rgn->region[r1].base;
|
|
u64 size1 = rgn->region[r1].size;
|
|
u64 base2 = rgn->region[r2].base;
|
|
u64 size2 = rgn->region[r2].size;
|
|
|
|
return lmb_addrs_adjacent(base1, size1, base2, size2);
|
|
}
|
|
|
|
static void __init lmb_remove_region(struct lmb_region *rgn, unsigned long r)
|
|
{
|
|
unsigned long i;
|
|
|
|
for (i = r; i < rgn->cnt - 1; i++) {
|
|
rgn->region[i].base = rgn->region[i + 1].base;
|
|
rgn->region[i].size = rgn->region[i + 1].size;
|
|
}
|
|
rgn->cnt--;
|
|
}
|
|
|
|
/* Assumption: base addr of region 1 < base addr of region 2 */
|
|
static void __init lmb_coalesce_regions(struct lmb_region *rgn,
|
|
unsigned long r1, unsigned long r2)
|
|
{
|
|
rgn->region[r1].size += rgn->region[r2].size;
|
|
lmb_remove_region(rgn, r2);
|
|
}
|
|
|
|
/* This routine called with relocation disabled. */
|
|
void __init lmb_init(void)
|
|
{
|
|
/* Create a dummy zero size LMB which will get coalesced away later.
|
|
* This simplifies the lmb_add() code below...
|
|
*/
|
|
lmb.memory.region[0].base = 0;
|
|
lmb.memory.region[0].size = 0;
|
|
lmb.memory.cnt = 1;
|
|
|
|
/* Ditto. */
|
|
lmb.reserved.region[0].base = 0;
|
|
lmb.reserved.region[0].size = 0;
|
|
lmb.reserved.cnt = 1;
|
|
}
|
|
|
|
/* This routine may be called with relocation disabled. */
|
|
void __init lmb_analyze(void)
|
|
{
|
|
int i;
|
|
|
|
lmb.memory.size = 0;
|
|
|
|
for (i = 0; i < lmb.memory.cnt; i++)
|
|
lmb.memory.size += lmb.memory.region[i].size;
|
|
}
|
|
|
|
/* This routine called with relocation disabled. */
|
|
static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
|
|
{
|
|
unsigned long coalesced = 0;
|
|
long adjacent, i;
|
|
|
|
if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
|
|
rgn->region[0].base = base;
|
|
rgn->region[0].size = size;
|
|
return 0;
|
|
}
|
|
|
|
/* First try and coalesce this LMB with another. */
|
|
for (i=0; i < rgn->cnt; i++) {
|
|
u64 rgnbase = rgn->region[i].base;
|
|
u64 rgnsize = rgn->region[i].size;
|
|
|
|
if ((rgnbase == base) && (rgnsize == size))
|
|
/* Already have this region, so we're done */
|
|
return 0;
|
|
|
|
adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
|
|
if ( adjacent > 0 ) {
|
|
rgn->region[i].base -= size;
|
|
rgn->region[i].size += size;
|
|
coalesced++;
|
|
break;
|
|
}
|
|
else if ( adjacent < 0 ) {
|
|
rgn->region[i].size += size;
|
|
coalesced++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
|
|
lmb_coalesce_regions(rgn, i, i+1);
|
|
coalesced++;
|
|
}
|
|
|
|
if (coalesced)
|
|
return coalesced;
|
|
if (rgn->cnt >= MAX_LMB_REGIONS)
|
|
return -1;
|
|
|
|
/* Couldn't coalesce the LMB, so add it to the sorted table. */
|
|
for (i = rgn->cnt-1; i >= 0; i--) {
|
|
if (base < rgn->region[i].base) {
|
|
rgn->region[i+1].base = rgn->region[i].base;
|
|
rgn->region[i+1].size = rgn->region[i].size;
|
|
} else {
|
|
rgn->region[i+1].base = base;
|
|
rgn->region[i+1].size = size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (base < rgn->region[0].base) {
|
|
rgn->region[0].base = base;
|
|
rgn->region[0].size = size;
|
|
}
|
|
rgn->cnt++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This routine may be called with relocation disabled. */
|
|
long __init lmb_add(u64 base, u64 size)
|
|
{
|
|
struct lmb_region *_rgn = &(lmb.memory);
|
|
|
|
/* On pSeries LPAR systems, the first LMB is our RMO region. */
|
|
if (base == 0)
|
|
lmb.rmo_size = size;
|
|
|
|
return lmb_add_region(_rgn, base, size);
|
|
|
|
}
|
|
|
|
long __init lmb_reserve(u64 base, u64 size)
|
|
{
|
|
struct lmb_region *_rgn = &(lmb.reserved);
|
|
|
|
BUG_ON(0 == size);
|
|
|
|
return lmb_add_region(_rgn, base, size);
|
|
}
|
|
|
|
long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base,
|
|
u64 size)
|
|
{
|
|
unsigned long i;
|
|
|
|
for (i=0; i < rgn->cnt; i++) {
|
|
u64 rgnbase = rgn->region[i].base;
|
|
u64 rgnsize = rgn->region[i].size;
|
|
if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (i < rgn->cnt) ? i : -1;
|
|
}
|
|
|
|
u64 __init lmb_alloc(u64 size, u64 align)
|
|
{
|
|
return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
|
|
}
|
|
|
|
u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr)
|
|
{
|
|
u64 alloc;
|
|
|
|
alloc = __lmb_alloc_base(size, align, max_addr);
|
|
|
|
if (alloc == 0)
|
|
panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
|
|
(unsigned long long) size, (unsigned long long) max_addr);
|
|
|
|
return alloc;
|
|
}
|
|
|
|
static u64 lmb_align_down(u64 addr, u64 size)
|
|
{
|
|
return addr & ~(size - 1);
|
|
}
|
|
|
|
static u64 lmb_align_up(u64 addr, u64 size)
|
|
{
|
|
return (addr + (size - 1)) & ~(size - 1);
|
|
}
|
|
|
|
u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)
|
|
{
|
|
long i, j;
|
|
u64 base = 0;
|
|
|
|
BUG_ON(0 == size);
|
|
|
|
/* On some platforms, make sure we allocate lowmem */
|
|
if (max_addr == LMB_ALLOC_ANYWHERE)
|
|
max_addr = LMB_REAL_LIMIT;
|
|
|
|
for (i = lmb.memory.cnt-1; i >= 0; i--) {
|
|
u64 lmbbase = lmb.memory.region[i].base;
|
|
u64 lmbsize = lmb.memory.region[i].size;
|
|
|
|
if (max_addr == LMB_ALLOC_ANYWHERE)
|
|
base = lmb_align_down(lmbbase + lmbsize - size, align);
|
|
else if (lmbbase < max_addr) {
|
|
base = min(lmbbase + lmbsize, max_addr);
|
|
base = lmb_align_down(base - size, align);
|
|
} else
|
|
continue;
|
|
|
|
while ((lmbbase <= base) &&
|
|
((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0) )
|
|
base = lmb_align_down(lmb.reserved.region[j].base - size,
|
|
align);
|
|
|
|
if ((base != 0) && (lmbbase <= base))
|
|
break;
|
|
}
|
|
|
|
if (i < 0)
|
|
return 0;
|
|
|
|
if (lmb_add_region(&lmb.reserved, base, lmb_align_up(size, align)) < 0)
|
|
return 0;
|
|
|
|
return base;
|
|
}
|
|
|
|
/* You must call lmb_analyze() before this. */
|
|
u64 __init lmb_phys_mem_size(void)
|
|
{
|
|
return lmb.memory.size;
|
|
}
|
|
|
|
u64 __init lmb_end_of_DRAM(void)
|
|
{
|
|
int idx = lmb.memory.cnt - 1;
|
|
|
|
return (lmb.memory.region[idx].base + lmb.memory.region[idx].size);
|
|
}
|
|
|
|
/* You must call lmb_analyze() after this. */
|
|
void __init lmb_enforce_memory_limit(u64 memory_limit)
|
|
{
|
|
unsigned long i;
|
|
u64 limit;
|
|
struct lmb_property *p;
|
|
|
|
if (! memory_limit)
|
|
return;
|
|
|
|
/* Truncate the lmb regions to satisfy the memory limit. */
|
|
limit = memory_limit;
|
|
for (i = 0; i < lmb.memory.cnt; i++) {
|
|
if (limit > lmb.memory.region[i].size) {
|
|
limit -= lmb.memory.region[i].size;
|
|
continue;
|
|
}
|
|
|
|
lmb.memory.region[i].size = limit;
|
|
lmb.memory.cnt = i + 1;
|
|
break;
|
|
}
|
|
|
|
if (lmb.memory.region[0].size < lmb.rmo_size)
|
|
lmb.rmo_size = lmb.memory.region[0].size;
|
|
|
|
/* And truncate any reserves above the limit also. */
|
|
for (i = 0; i < lmb.reserved.cnt; i++) {
|
|
p = &lmb.reserved.region[i];
|
|
|
|
if (p->base > memory_limit)
|
|
p->size = 0;
|
|
else if ((p->base + p->size) > memory_limit)
|
|
p->size = memory_limit - p->base;
|
|
|
|
if (p->size == 0) {
|
|
lmb_remove_region(&lmb.reserved, i);
|
|
i--;
|
|
}
|
|
}
|
|
}
|
|
|
|
int __init lmb_is_reserved(u64 addr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < lmb.reserved.cnt; i++) {
|
|
u64 upper = lmb.reserved.region[i].base +
|
|
lmb.reserved.region[i].size - 1;
|
|
if ((addr >= lmb.reserved.region[i].base) && (addr <= upper))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|