499 lines
12 KiB
C
499 lines
12 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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#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 acpi_table_slit *acpi_slit;
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static nodemask_t nodes_parsed __initdata;
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static nodemask_t cpu_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 num_node_memblks __initdata;
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static struct bootnode node_memblk_range[NR_NODE_MEMBLKS] __initdata;
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static int memblk_nodeid[NR_NODE_MEMBLKS] __initdata;
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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_memblks(unsigned long start, unsigned long end)
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{
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int i;
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for (i = 0; i < num_node_memblks; i++) {
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struct bootnode *nd = &node_memblk_range[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 memblk_nodeid[i];
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if (nd->end == end && nd->start == start)
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return memblk_nodeid[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 (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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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[i].start = nodes[i].end = 0;
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nodes_add[i].start = nodes_add[i].end = 0;
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}
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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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/* 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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unsigned length;
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unsigned long phys;
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length = slit->header.length;
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phys = find_e820_area(0, max_pfn_mapped<<PAGE_SHIFT, length,
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PAGE_SIZE);
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if (phys == -1L)
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panic(" Can not save slit!\n");
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acpi_slit = __va(phys);
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memcpy(acpi_slit, slit, length);
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reserve_early(phys, phys + length, "ACPI SLIT");
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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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apicid_to_node[apic_id] = node;
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node_set(node, cpu_nodes_parsed);
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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, 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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apicid_to_node[apic_id] = node;
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node_set(node, cpu_nodes_parsed);
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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, 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, cpu_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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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_memblks(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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start, end);
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e820_register_active_regions(node, start >> PAGE_SHIFT,
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end >> PAGE_SHIFT);
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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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/* restore nodes[node] */
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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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node_memblk_range[num_node_memblks].start = start;
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node_memblk_range[num_node_memblks].end = end;
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memblk_nodeid[num_node_memblks] = node;
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num_node_memblks++;
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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 = max_pfn - (e820_hole_size(0, max_pfn<<PAGE_SHIFT)>>PAGE_SHIFT);
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/* We seem to lose 3 pages somewhere. Allow 1M of slack. */
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if ((long)(e820ram - pxmram) >= (1<<(20 - PAGE_SHIFT))) {
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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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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_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(node_memblk_range, num_node_memblks,
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memblk_nodeid);
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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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/* Account for nodes with cpus and no memory */
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nodes_or(node_possible_map, nodes_parsed, cpu_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_cpu_ids; i++) {
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int node = early_cpu_to_node(i);
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if (node == NUMA_NO_NODE)
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continue;
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if (!node_online(node))
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numa_clear_node(i);
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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 fake_node_to_pxm_map[MAX_NUMNODES] __initdata = {
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[0 ... MAX_NUMNODES-1] = PXM_INVAL
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};
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static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
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[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
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};
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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 ret;
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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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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));
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nodes_clear(nodes_parsed);
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for (i = 0; i < num_nodes; i++)
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if (fake_nodes[i].start != fake_nodes[i].end)
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node_set(i, nodes_parsed);
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WARN_ON(!nodes_cover_memory(fake_nodes));
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}
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static int null_slit_node_compare(int a, int b)
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{
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return node_to_pxm(a) == node_to_pxm(b);
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}
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#else
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static int null_slit_node_compare(int a, int b)
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{
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return a == b;
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}
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#endif /* CONFIG_NUMA_EMU */
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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 null_slit_node_compare(a, b) ? LOCAL_DISTANCE :
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REMOTE_DISTANCE;
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index = acpi_slit->locality_count * 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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#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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