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