You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
483 lines
12 KiB
483 lines
12 KiB
/*
|
|
* ACPI 3.0 based NUMA setup
|
|
* Copyright 2004 Andi Kleen, SuSE Labs.
|
|
*
|
|
* Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
|
|
*
|
|
* Called from acpi_numa_init while reading the SRAT and SLIT tables.
|
|
* Assumes all memory regions belonging to a single proximity domain
|
|
* are in one chunk. Holes between them will be included in the node.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/module.h>
|
|
#include <linux/topology.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/numa.h>
|
|
#include <asm/e820.h>
|
|
|
|
#if (defined(CONFIG_ACPI_HOTPLUG_MEMORY) || \
|
|
defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)) \
|
|
&& !defined(CONFIG_MEMORY_HOTPLUG)
|
|
#define RESERVE_HOTADD 1
|
|
#endif
|
|
|
|
static struct acpi_table_slit *acpi_slit;
|
|
|
|
static nodemask_t nodes_parsed __initdata;
|
|
static nodemask_t nodes_found __initdata;
|
|
static struct bootnode nodes[MAX_NUMNODES] __initdata;
|
|
static struct bootnode nodes_add[MAX_NUMNODES] __initdata;
|
|
static int found_add_area __initdata;
|
|
int hotadd_percent __initdata = 0;
|
|
#ifndef RESERVE_HOTADD
|
|
#define hotadd_percent 0 /* Ignore all settings */
|
|
#endif
|
|
static u8 pxm2node[256] = { [0 ... 255] = 0xff };
|
|
|
|
/* Too small nodes confuse the VM badly. Usually they result
|
|
from BIOS bugs. */
|
|
#define NODE_MIN_SIZE (4*1024*1024)
|
|
|
|
static int node_to_pxm(int n);
|
|
|
|
int pxm_to_node(int pxm)
|
|
{
|
|
if ((unsigned)pxm >= 256)
|
|
return -1;
|
|
/* Extend 0xff to (int)-1 */
|
|
return (signed char)pxm2node[pxm];
|
|
}
|
|
|
|
static __init int setup_node(int pxm)
|
|
{
|
|
unsigned node = pxm2node[pxm];
|
|
if (node == 0xff) {
|
|
if (nodes_weight(nodes_found) >= MAX_NUMNODES)
|
|
return -1;
|
|
node = first_unset_node(nodes_found);
|
|
node_set(node, nodes_found);
|
|
pxm2node[pxm] = node;
|
|
}
|
|
return pxm2node[pxm];
|
|
}
|
|
|
|
static __init int conflicting_nodes(unsigned long start, unsigned long end)
|
|
{
|
|
int i;
|
|
for_each_node_mask(i, nodes_parsed) {
|
|
struct bootnode *nd = &nodes[i];
|
|
if (nd->start == nd->end)
|
|
continue;
|
|
if (nd->end > start && nd->start < end)
|
|
return i;
|
|
if (nd->end == end && nd->start == start)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static __init void cutoff_node(int i, unsigned long start, unsigned long end)
|
|
{
|
|
struct bootnode *nd = &nodes[i];
|
|
|
|
if (found_add_area)
|
|
return;
|
|
|
|
if (nd->start < start) {
|
|
nd->start = start;
|
|
if (nd->end < nd->start)
|
|
nd->start = nd->end;
|
|
}
|
|
if (nd->end > end) {
|
|
nd->end = end;
|
|
if (nd->start > nd->end)
|
|
nd->start = nd->end;
|
|
}
|
|
}
|
|
|
|
static __init void bad_srat(void)
|
|
{
|
|
int i;
|
|
printk(KERN_ERR "SRAT: SRAT not used.\n");
|
|
acpi_numa = -1;
|
|
found_add_area = 0;
|
|
for (i = 0; i < MAX_LOCAL_APIC; i++)
|
|
apicid_to_node[i] = NUMA_NO_NODE;
|
|
for (i = 0; i < MAX_NUMNODES; i++)
|
|
nodes_add[i].start = nodes[i].end = 0;
|
|
}
|
|
|
|
static __init inline int srat_disabled(void)
|
|
{
|
|
return numa_off || acpi_numa < 0;
|
|
}
|
|
|
|
/*
|
|
* A lot of BIOS fill in 10 (= no distance) everywhere. This messes
|
|
* up the NUMA heuristics which wants the local node to have a smaller
|
|
* distance than the others.
|
|
* Do some quick checks here and only use the SLIT if it passes.
|
|
*/
|
|
static __init int slit_valid(struct acpi_table_slit *slit)
|
|
{
|
|
int i, j;
|
|
int d = slit->localities;
|
|
for (i = 0; i < d; i++) {
|
|
for (j = 0; j < d; j++) {
|
|
u8 val = slit->entry[d*i + j];
|
|
if (i == j) {
|
|
if (val != 10)
|
|
return 0;
|
|
} else if (val <= 10)
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* Callback for SLIT parsing */
|
|
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
|
|
{
|
|
if (!slit_valid(slit)) {
|
|
printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
|
|
return;
|
|
}
|
|
acpi_slit = slit;
|
|
}
|
|
|
|
/* Callback for Proximity Domain -> LAPIC mapping */
|
|
void __init
|
|
acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
|
|
{
|
|
int pxm, node;
|
|
if (srat_disabled())
|
|
return;
|
|
if (pa->header.length != sizeof(struct acpi_table_processor_affinity)) {
|
|
bad_srat();
|
|
return;
|
|
}
|
|
if (pa->flags.enabled == 0)
|
|
return;
|
|
pxm = pa->proximity_domain;
|
|
node = setup_node(pxm);
|
|
if (node < 0) {
|
|
printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
|
|
bad_srat();
|
|
return;
|
|
}
|
|
apicid_to_node[pa->apic_id] = node;
|
|
acpi_numa = 1;
|
|
printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n",
|
|
pxm, pa->apic_id, node);
|
|
}
|
|
|
|
#ifdef RESERVE_HOTADD
|
|
/*
|
|
* Protect against too large hotadd areas that would fill up memory.
|
|
*/
|
|
static int hotadd_enough_memory(struct bootnode *nd)
|
|
{
|
|
static unsigned long allocated;
|
|
static unsigned long last_area_end;
|
|
unsigned long pages = (nd->end - nd->start) >> PAGE_SHIFT;
|
|
long mem = pages * sizeof(struct page);
|
|
unsigned long addr;
|
|
unsigned long allowed;
|
|
unsigned long oldpages = pages;
|
|
|
|
if (mem < 0)
|
|
return 0;
|
|
allowed = (end_pfn - e820_hole_size(0, end_pfn)) * PAGE_SIZE;
|
|
allowed = (allowed / 100) * hotadd_percent;
|
|
if (allocated + mem > allowed) {
|
|
unsigned long range;
|
|
/* Give them at least part of their hotadd memory upto hotadd_percent
|
|
It would be better to spread the limit out
|
|
over multiple hotplug areas, but that is too complicated
|
|
right now */
|
|
if (allocated >= allowed)
|
|
return 0;
|
|
range = allowed - allocated;
|
|
pages = (range / PAGE_SIZE);
|
|
mem = pages * sizeof(struct page);
|
|
nd->end = nd->start + range;
|
|
}
|
|
/* Not completely fool proof, but a good sanity check */
|
|
addr = find_e820_area(last_area_end, end_pfn<<PAGE_SHIFT, mem);
|
|
if (addr == -1UL)
|
|
return 0;
|
|
if (pages != oldpages)
|
|
printk(KERN_NOTICE "SRAT: Hotadd area limited to %lu bytes\n",
|
|
pages << PAGE_SHIFT);
|
|
last_area_end = addr + mem;
|
|
allocated += mem;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* It is fine to add this area to the nodes data it will be used later
|
|
* This code supports one contigious hot add area per node.
|
|
*/
|
|
static int reserve_hotadd(int node, unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long s_pfn = start >> PAGE_SHIFT;
|
|
unsigned long e_pfn = end >> PAGE_SHIFT;
|
|
int changed = 0;
|
|
struct bootnode *nd = &nodes_add[node];
|
|
|
|
/* I had some trouble with strange memory hotadd regions breaking
|
|
the boot. Be very strict here and reject anything unexpected.
|
|
If you want working memory hotadd write correct SRATs.
|
|
|
|
The node size check is a basic sanity check to guard against
|
|
mistakes */
|
|
if ((signed long)(end - start) < NODE_MIN_SIZE) {
|
|
printk(KERN_ERR "SRAT: Hotplug area too small\n");
|
|
return -1;
|
|
}
|
|
|
|
/* This check might be a bit too strict, but I'm keeping it for now. */
|
|
if (e820_hole_size(s_pfn, e_pfn) != e_pfn - s_pfn) {
|
|
printk(KERN_ERR "SRAT: Hotplug area has existing memory\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!hotadd_enough_memory(&nodes_add[node])) {
|
|
printk(KERN_ERR "SRAT: Hotplug area too large\n");
|
|
return -1;
|
|
}
|
|
|
|
/* Looks good */
|
|
|
|
found_add_area = 1;
|
|
if (nd->start == nd->end) {
|
|
nd->start = start;
|
|
nd->end = end;
|
|
changed = 1;
|
|
} else {
|
|
if (nd->start == end) {
|
|
nd->start = start;
|
|
changed = 1;
|
|
}
|
|
if (nd->end == start) {
|
|
nd->end = end;
|
|
changed = 1;
|
|
}
|
|
if (!changed)
|
|
printk(KERN_ERR "SRAT: Hotplug zone not continuous. Partly ignored\n");
|
|
}
|
|
|
|
if ((nd->end >> PAGE_SHIFT) > end_pfn)
|
|
end_pfn = nd->end >> PAGE_SHIFT;
|
|
|
|
if (changed)
|
|
printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n", nd->start, nd->end);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
|
|
void __init
|
|
acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
|
|
{
|
|
struct bootnode *nd, oldnode;
|
|
unsigned long start, end;
|
|
int node, pxm;
|
|
int i;
|
|
|
|
if (srat_disabled())
|
|
return;
|
|
if (ma->header.length != sizeof(struct acpi_table_memory_affinity)) {
|
|
bad_srat();
|
|
return;
|
|
}
|
|
if (ma->flags.enabled == 0)
|
|
return;
|
|
if (ma->flags.hot_pluggable && hotadd_percent == 0)
|
|
return;
|
|
start = ma->base_addr_lo | ((u64)ma->base_addr_hi << 32);
|
|
end = start + (ma->length_lo | ((u64)ma->length_hi << 32));
|
|
pxm = ma->proximity_domain;
|
|
node = setup_node(pxm);
|
|
if (node < 0) {
|
|
printk(KERN_ERR "SRAT: Too many proximity domains.\n");
|
|
bad_srat();
|
|
return;
|
|
}
|
|
i = conflicting_nodes(start, end);
|
|
if (i == node) {
|
|
printk(KERN_WARNING
|
|
"SRAT: Warning: PXM %d (%lx-%lx) overlaps with itself (%Lx-%Lx)\n",
|
|
pxm, start, end, nodes[i].start, nodes[i].end);
|
|
} else if (i >= 0) {
|
|
printk(KERN_ERR
|
|
"SRAT: PXM %d (%lx-%lx) overlaps with PXM %d (%Lx-%Lx)\n",
|
|
pxm, start, end, node_to_pxm(i),
|
|
nodes[i].start, nodes[i].end);
|
|
bad_srat();
|
|
return;
|
|
}
|
|
nd = &nodes[node];
|
|
oldnode = *nd;
|
|
if (!node_test_and_set(node, nodes_parsed)) {
|
|
nd->start = start;
|
|
nd->end = end;
|
|
} else {
|
|
if (start < nd->start)
|
|
nd->start = start;
|
|
if (nd->end < end)
|
|
nd->end = end;
|
|
}
|
|
|
|
printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
|
|
nd->start, nd->end);
|
|
|
|
#ifdef RESERVE_HOTADD
|
|
if (ma->flags.hot_pluggable && reserve_hotadd(node, start, end) < 0) {
|
|
/* Ignore hotadd region. Undo damage */
|
|
printk(KERN_NOTICE "SRAT: Hotplug region ignored\n");
|
|
*nd = oldnode;
|
|
if ((nd->start | nd->end) == 0)
|
|
node_clear(node, nodes_parsed);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Sanity check to catch more bad SRATs (they are amazingly common).
|
|
Make sure the PXMs cover all memory. */
|
|
static int nodes_cover_memory(void)
|
|
{
|
|
int i;
|
|
unsigned long pxmram, e820ram;
|
|
|
|
pxmram = 0;
|
|
for_each_node_mask(i, nodes_parsed) {
|
|
unsigned long s = nodes[i].start >> PAGE_SHIFT;
|
|
unsigned long e = nodes[i].end >> PAGE_SHIFT;
|
|
pxmram += e - s;
|
|
pxmram -= e820_hole_size(s, e);
|
|
pxmram -= nodes_add[i].end - nodes_add[i].start;
|
|
if ((long)pxmram < 0)
|
|
pxmram = 0;
|
|
}
|
|
|
|
e820ram = end_pfn - e820_hole_size(0, end_pfn);
|
|
/* We seem to lose 3 pages somewhere. Allow a bit of slack. */
|
|
if ((long)(e820ram - pxmram) >= 1*1024*1024) {
|
|
printk(KERN_ERR
|
|
"SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n",
|
|
(pxmram << PAGE_SHIFT) >> 20,
|
|
(e820ram << PAGE_SHIFT) >> 20);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void unparse_node(int node)
|
|
{
|
|
int i;
|
|
node_clear(node, nodes_parsed);
|
|
for (i = 0; i < MAX_LOCAL_APIC; i++) {
|
|
if (apicid_to_node[i] == node)
|
|
apicid_to_node[i] = NUMA_NO_NODE;
|
|
}
|
|
}
|
|
|
|
void __init acpi_numa_arch_fixup(void) {}
|
|
|
|
/* Use the information discovered above to actually set up the nodes. */
|
|
int __init acpi_scan_nodes(unsigned long start, unsigned long end)
|
|
{
|
|
int i;
|
|
|
|
/* First clean up the node list */
|
|
for (i = 0; i < MAX_NUMNODES; i++) {
|
|
cutoff_node(i, start, end);
|
|
if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE) {
|
|
unparse_node(i);
|
|
node_set_offline(i);
|
|
}
|
|
}
|
|
|
|
if (acpi_numa <= 0)
|
|
return -1;
|
|
|
|
if (!nodes_cover_memory()) {
|
|
bad_srat();
|
|
return -1;
|
|
}
|
|
|
|
memnode_shift = compute_hash_shift(nodes, MAX_NUMNODES);
|
|
if (memnode_shift < 0) {
|
|
printk(KERN_ERR
|
|
"SRAT: No NUMA node hash function found. Contact maintainer\n");
|
|
bad_srat();
|
|
return -1;
|
|
}
|
|
|
|
/* Finally register nodes */
|
|
for_each_node_mask(i, nodes_parsed)
|
|
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
|
|
/* Try again in case setup_node_bootmem missed one due
|
|
to missing bootmem */
|
|
for_each_node_mask(i, nodes_parsed)
|
|
if (!node_online(i))
|
|
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
|
|
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
if (cpu_to_node[i] == NUMA_NO_NODE)
|
|
continue;
|
|
if (!node_isset(cpu_to_node[i], nodes_parsed))
|
|
numa_set_node(i, NUMA_NO_NODE);
|
|
}
|
|
numa_init_array();
|
|
return 0;
|
|
}
|
|
|
|
static int node_to_pxm(int n)
|
|
{
|
|
int i;
|
|
if (pxm2node[n] == n)
|
|
return n;
|
|
for (i = 0; i < 256; i++)
|
|
if (pxm2node[i] == n)
|
|
return i;
|
|
return 0;
|
|
}
|
|
|
|
void __init srat_reserve_add_area(int nodeid)
|
|
{
|
|
if (found_add_area && nodes_add[nodeid].end) {
|
|
u64 total_mb;
|
|
|
|
printk(KERN_INFO "SRAT: Reserving hot-add memory space "
|
|
"for node %d at %Lx-%Lx\n",
|
|
nodeid, nodes_add[nodeid].start, nodes_add[nodeid].end);
|
|
total_mb = (nodes_add[nodeid].end - nodes_add[nodeid].start)
|
|
>> PAGE_SHIFT;
|
|
total_mb *= sizeof(struct page);
|
|
total_mb >>= 20;
|
|
printk(KERN_INFO "SRAT: This will cost you %Lu MB of "
|
|
"pre-allocated memory.\n", (unsigned long long)total_mb);
|
|
reserve_bootmem_node(NODE_DATA(nodeid), nodes_add[nodeid].start,
|
|
nodes_add[nodeid].end - nodes_add[nodeid].start);
|
|
}
|
|
}
|
|
|
|
int __node_distance(int a, int b)
|
|
{
|
|
int index;
|
|
|
|
if (!acpi_slit)
|
|
return a == b ? 10 : 20;
|
|
index = acpi_slit->localities * node_to_pxm(a);
|
|
return acpi_slit->entry[index + node_to_pxm(b)];
|
|
}
|
|
|
|
EXPORT_SYMBOL(__node_distance);
|
|
|