317 lines
7.5 KiB
C
317 lines
7.5 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 <asm/proto.h>
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#include <asm/numa.h>
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#include <asm/e820.h>
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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 nodes_found __initdata;
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static struct node nodes[MAX_NUMNODES] __initdata;
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static u8 pxm2node[256] = { [0 ... 255] = 0xff };
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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 int node_to_pxm(int n);
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int pxm_to_node(int pxm)
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{
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if ((unsigned)pxm >= 256)
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return -1;
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/* Extend 0xff to (int)-1 */
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return (signed char)pxm2node[pxm];
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}
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static __init int setup_node(int pxm)
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{
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unsigned node = pxm2node[pxm];
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if (node == 0xff) {
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if (nodes_weight(nodes_found) >= MAX_NUMNODES)
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return -1;
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node = first_unset_node(nodes_found);
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node_set(node, nodes_found);
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pxm2node[pxm] = node;
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}
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return pxm2node[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 node *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 node *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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}
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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)) { 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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/* 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 node *nd;
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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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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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/* It is fine to add this area to the nodes data it will be used later*/
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if (ma->flags.hot_pluggable == 1)
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printk(KERN_INFO "SRAT: hot plug zone found %lx - %lx \n",
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start, end);
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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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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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}
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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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}
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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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}
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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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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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static int node_to_pxm(int n)
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{
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int i;
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if (pxm2node[n] == n)
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return n;
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for (i = 0; i < 256; i++)
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if (pxm2node[i] == n)
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return i;
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return 0;
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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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