mirror of https://gitee.com/openkylin/linux.git
261 lines
6.1 KiB
C
261 lines
6.1 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/memblock.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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#include <asm/apic.h>
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#include <asm/uv/uv.h>
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int acpi_numa __initdata;
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static struct bootnode nodes_add[MAX_NUMNODES];
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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 void bad_srat(void)
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{
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printk(KERN_ERR "SRAT: SRAT not used.\n");
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acpi_numa = -1;
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memset(nodes_add, 0, sizeof(nodes_add));
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}
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static __init inline int srat_disabled(void)
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{
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return acpi_numa < 0;
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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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int i, j;
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for (i = 0; i < slit->locality_count; i++)
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for (j = 0; j < slit->locality_count; j++)
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numa_set_distance(pxm_to_node(i), pxm_to_node(j),
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slit->entry[slit->locality_count * i + j]);
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}
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/* Callback for Proximity Domain -> x2APIC mapping */
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void __init
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acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
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{
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int pxm, node;
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int apic_id;
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if (srat_disabled())
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return;
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if (pa->header.length < sizeof(struct acpi_srat_x2apic_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;
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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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apic_id = pa->apic_id;
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if (apic_id >= MAX_LOCAL_APIC) {
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printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
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return;
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}
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set_apicid_to_node(apic_id, node);
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node_set(node, numa_nodes_parsed);
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acpi_numa = 1;
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printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
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pxm, apic_id, node);
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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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int apic_id;
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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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if (get_uv_system_type() >= UV_X2APIC)
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apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
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else
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apic_id = pa->apic_id;
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if (apic_id >= MAX_LOCAL_APIC) {
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printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
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return;
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}
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set_apicid_to_node(apic_id, node);
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node_set(node, numa_nodes_parsed);
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acpi_numa = 1;
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printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
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pxm, apic_id, node);
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}
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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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/*
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* Update nodes_add[]
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* This code supports one contiguous hot add area per node
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*/
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static void __init
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update_nodes_add(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;
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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;
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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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if (changed) {
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node_set(node, numa_nodes_parsed);
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printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n",
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nd->start, nd->end);
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}
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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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unsigned long start, end;
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int node, pxm;
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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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if (numa_add_memblk(node, start, end) < 0) {
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bad_srat();
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return;
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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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start, end);
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if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)
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update_nodes_add(node, start, end);
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}
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void __init acpi_numa_arch_fixup(void) {}
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int __init x86_acpi_numa_init(void)
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{
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int ret;
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ret = acpi_numa_init();
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if (ret < 0)
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return ret;
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return srat_disabled() ? -EINVAL : 0;
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}
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#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || defined(CONFIG_ACPI_HOTPLUG_MEMORY)
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int memory_add_physaddr_to_nid(u64 start)
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{
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int i, ret = 0;
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for_each_node(i)
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if (nodes_add[i].start <= start && nodes_add[i].end > start)
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ret = i;
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return ret;
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}
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EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
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#endif
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