2aed711a39
Previously the numa hash code would be confused by holes in the node space and stop early. This is the first part of the fix for the non boot issue with empty nodes on Opterons. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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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