567 lines
14 KiB
C
567 lines
14 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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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];
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static int found_add_area __initdata;
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int hotadd_percent __initdata = 0;
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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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remove_all_active_ranges();
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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->locality_count;
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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 != LOCAL_DISTANCE)
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return 0;
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} else if (val <= LOCAL_DISTANCE)
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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_srat_cpu_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_srat_cpu_affinity)) {
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bad_srat();
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return;
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}
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if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
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return;
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pxm = pa->proximity_domain_lo;
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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 CONFIG_MEMORY_HOTPLUG_RESERVE
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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 - absent_pages_in_range(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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static int update_end_of_memory(unsigned long end)
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{
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found_add_area = 1;
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if ((end >> PAGE_SHIFT) > end_pfn)
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end_pfn = end >> PAGE_SHIFT;
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return 1;
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}
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static inline int save_add_info(void)
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{
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return hotadd_percent > 0;
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}
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#else
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int update_end_of_memory(unsigned long end) {return -1;}
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static int hotadd_enough_memory(struct bootnode *nd) {return 1;}
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#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
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static inline int save_add_info(void) {return 1;}
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#else
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static inline int save_add_info(void) {return 0;}
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#endif
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#endif
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/*
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* Update nodes_add and decide if to include add are in the zone.
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* Both SPARSE and RESERVE need nodes_add infomation.
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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 ret = 0, 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 (absent_pages_in_range(s_pfn, e_pfn) != e_pfn - s_pfn) {
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printk(KERN_ERR
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"SRAT: Hotplug area %lu -> %lu has existing memory\n",
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s_pfn, e_pfn);
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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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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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ret = update_end_of_memory(nd->end);
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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 ret;
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}
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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_srat_mem_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_srat_mem_affinity)) {
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bad_srat();
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return;
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}
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if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
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return;
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if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
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return;
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start = ma->base_address;
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end = start + ma->length;
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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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e820_register_active_regions(node, nd->start >> PAGE_SHIFT,
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nd->end >> PAGE_SHIFT);
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push_node_boundaries(node, nd->start >> PAGE_SHIFT,
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nd->end >> PAGE_SHIFT);
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if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) &&
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(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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}
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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 __init nodes_cover_memory(const struct bootnode *nodes)
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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 -= absent_pages_in_range(s, e);
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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 - absent_pages_in_range(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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if (acpi_numa <= 0)
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return -1;
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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 (!nodes_cover_memory(nodes)) {
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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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node_possible_map = nodes_parsed;
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/* Finally register nodes */
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for_each_node_mask(i, node_possible_map)
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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, node_possible_map)
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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], node_possible_map))
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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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#ifdef CONFIG_NUMA_EMU
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static int __init find_node_by_addr(unsigned long addr)
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{
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int ret = NUMA_NO_NODE;
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int i;
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for_each_node_mask(i, nodes_parsed) {
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/*
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* Find the real node that this emulated node appears on. For
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* the sake of simplicity, we only use a real node's starting
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* address to determine which emulated node it appears on.
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*/
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if (addr >= nodes[i].start && addr < nodes[i].end) {
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ret = i;
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break;
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}
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}
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return i;
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}
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/*
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* In NUMA emulation, we need to setup proximity domain (_PXM) to node ID
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* mappings that respect the real ACPI topology but reflect our emulated
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* environment. For each emulated node, we find which real node it appears on
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* and create PXM to NID mappings for those fake nodes which mirror that
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* locality. SLIT will now represent the correct distances between emulated
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* nodes as a result of the real topology.
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*/
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void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
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{
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int i, j;
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int fake_node_to_pxm_map[MAX_NUMNODES] = {
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[0 ... MAX_NUMNODES-1] = PXM_INVAL
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};
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unsigned char fake_apicid_to_node[MAX_LOCAL_APIC] = {
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[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
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};
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printk(KERN_INFO "Faking PXM affinity for fake nodes on real "
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"topology.\n");
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for (i = 0; i < num_nodes; i++) {
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int nid, pxm;
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nid = find_node_by_addr(fake_nodes[i].start);
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if (nid == NUMA_NO_NODE)
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continue;
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pxm = node_to_pxm(nid);
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if (pxm == PXM_INVAL)
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continue;
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fake_node_to_pxm_map[i] = pxm;
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/*
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* For each apicid_to_node mapping that exists for this real
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* node, it must now point to the fake node ID.
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*/
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for (j = 0; j < MAX_LOCAL_APIC; j++)
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if (apicid_to_node[j] == nid)
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fake_apicid_to_node[j] = i;
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}
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for (i = 0; i < num_nodes; i++)
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__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
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memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
|
|
|
|
nodes_clear(nodes_parsed);
|
|
for (i = 0; i < num_nodes; i++)
|
|
if (fake_nodes[i].start != fake_nodes[i].end)
|
|
node_set(i, nodes_parsed);
|
|
WARN_ON(!nodes_cover_memory(fake_nodes));
|
|
}
|
|
|
|
static int null_slit_node_compare(int a, int b)
|
|
{
|
|
return node_to_pxm(a) == node_to_pxm(b);
|
|
}
|
|
#else
|
|
static int null_slit_node_compare(int a, int b)
|
|
{
|
|
return a == b;
|
|
}
|
|
#endif /* CONFIG_NUMA_EMU */
|
|
|
|
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 null_slit_node_compare(a, b) ? LOCAL_DISTANCE :
|
|
REMOTE_DISTANCE;
|
|
index = acpi_slit->locality_count * node_to_pxm(a);
|
|
return acpi_slit->entry[index + node_to_pxm(b)];
|
|
}
|
|
|
|
EXPORT_SYMBOL(__node_distance);
|
|
|
|
int memory_add_physaddr_to_nid(u64 start)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
for_each_node(i)
|
|
if (nodes_add[i].start <= start && nodes_add[i].end > start)
|
|
ret = i;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
|
|
|