diff options
Diffstat (limited to 'arch/x86_64/mm/srat.c')
| -rw-r--r-- | arch/x86_64/mm/srat.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c new file mode 100644 index 0000000..5d01b31 --- /dev/null +++ b/arch/x86_64/mm/srat.c @@ -0,0 +1,217 @@ +/* + * ACPI 3.0 based NUMA setup + * Copyright 2004 Andi Kleen, SuSE Labs. + * + * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs. + * + * Called from acpi_numa_init while reading the SRAT and SLIT tables. + * Assumes all memory regions belonging to a single proximity domain + * are in one chunk. Holes between them will be included in the node. + */ + +#include <linux/kernel.h> +#include <linux/acpi.h> +#include <linux/mmzone.h> +#include <linux/bitmap.h> +#include <linux/module.h> +#include <linux/topology.h> +#include <asm/proto.h> +#include <asm/numa.h> + +static struct acpi_table_slit *acpi_slit; + +static nodemask_t nodes_parsed __initdata; +static nodemask_t nodes_found __initdata; +static struct node nodes[MAX_NUMNODES] __initdata; +static __u8 pxm2node[256] = { [0 ... 255] = 0xff }; + +static __init int setup_node(int pxm) +{ + unsigned node = pxm2node[pxm]; + if (node == 0xff) { + if (nodes_weight(nodes_found) >= MAX_NUMNODES) + return -1; + node = first_unset_node(nodes_found); + node_set(node, nodes_found); + pxm2node[pxm] = node; + } + return pxm2node[pxm]; +} + +static __init int conflicting_nodes(unsigned long start, unsigned long end) +{ + int i; + for_each_online_node(i) { + struct node *nd = &nodes[i]; + if (nd->start == nd->end) + continue; + if (nd->end > start && nd->start < end) + return 1; + if (nd->end == end && nd->start == start) + return 1; + } + return -1; +} + +static __init void cutoff_node(int i, unsigned long start, unsigned long end) +{ + struct node *nd = &nodes[i]; + if (nd->start < start) { + nd->start = start; + if (nd->end < nd->start) + nd->start = nd->end; + } + if (nd->end > end) { + if (!(end & 0xfff)) + end--; + nd->end = end; + if (nd->start > nd->end) + nd->start = nd->end; + } +} + +static __init void bad_srat(void) +{ + printk(KERN_ERR "SRAT: SRAT not used.\n"); + acpi_numa = -1; +} + +static __init inline int srat_disabled(void) +{ + return numa_off || acpi_numa < 0; +} + +/* Callback for SLIT parsing */ +void __init acpi_numa_slit_init(struct acpi_table_slit *slit) +{ + acpi_slit = slit; +} + +/* Callback for Proximity Domain -> LAPIC mapping */ +void __init +acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa) +{ + int pxm, node; + if (srat_disabled() || pa->flags.enabled == 0) + return; + pxm = pa->proximity_domain; + node = setup_node(pxm); + if (node < 0) { + printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); + bad_srat(); + return; + } + if (pa->apic_id >= NR_CPUS) { + printk(KERN_ERR "SRAT: lapic %u too large.\n", + pa->apic_id); + bad_srat(); + return; + } + cpu_to_node[pa->apic_id] = node; + acpi_numa = 1; + printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n", + pxm, pa->apic_id, node); +} + +/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */ +void __init +acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma) +{ + struct node *nd; + unsigned long start, end; + int node, pxm; + int i; + + if (srat_disabled() || ma->flags.enabled == 0) + return; + /* hotplug bit is ignored for now */ + pxm = ma->proximity_domain; + node = setup_node(pxm); + if (node < 0) { + printk(KERN_ERR "SRAT: Too many proximity domains.\n"); + bad_srat(); + return; + } + start = ma->base_addr_lo | ((u64)ma->base_addr_hi << 32); + end = start + (ma->length_lo | ((u64)ma->length_hi << 32)); + i = conflicting_nodes(start, end); + if (i >= 0) { + printk(KERN_ERR + "SRAT: pxm %d overlap %lx-%lx with node %d(%Lx-%Lx)\n", + pxm, start, end, i, nodes[i].start, nodes[i].end); + bad_srat(); + return; + } + nd = &nodes[node]; + if (!node_test_and_set(node, nodes_parsed)) { + nd->start = start; + nd->end = end; + } else { + if (start < nd->start) + nd->start = start; + if (nd->end < end) + nd->end = end; + } + if (!(nd->end & 0xfff)) + nd->end--; + printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm, + nd->start, nd->end); +} + +void __init acpi_numa_arch_fixup(void) {} + +/* Use the information discovered above to actually set up the nodes. */ +int __init acpi_scan_nodes(unsigned long start, unsigned long end) +{ + int i; + if (acpi_numa <= 0) + return -1; + memnode_shift = compute_hash_shift(nodes, nodes_weight(nodes_parsed)); + if (memnode_shift < 0) { + printk(KERN_ERR + "SRAT: No NUMA node hash function found. Contact maintainer\n"); + bad_srat(); + return -1; + } + for (i = 0; i < MAX_NUMNODES; i++) { + if (!node_isset(i, nodes_parsed)) + continue; + cutoff_node(i, start, end); + if (nodes[i].start == nodes[i].end) { + node_clear(i, nodes_parsed); + continue; + } + setup_node_bootmem(i, nodes[i].start, nodes[i].end); + } + for (i = 0; i < NR_CPUS; i++) { + if (cpu_to_node[i] == NUMA_NO_NODE) + continue; + if (!node_isset(cpu_to_node[i], nodes_parsed)) + cpu_to_node[i] = NUMA_NO_NODE; + } + numa_init_array(); + return 0; +} + +int node_to_pxm(int n) +{ + int i; + if (pxm2node[n] == n) + return n; + for (i = 0; i < 256; i++) + if (pxm2node[i] == n) + return i; + return 0; +} + +int __node_distance(int a, int b) +{ + int index; + + if (!acpi_slit) + return a == b ? 10 : 20; + index = acpi_slit->localities * node_to_pxm(a); + return acpi_slit->entry[index + node_to_pxm(b)]; +} + +EXPORT_SYMBOL(__node_distance); |