diff options
Diffstat (limited to 'arch/x86/mm/srat.c')
| -rw-r--r-- | arch/x86/mm/srat.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c new file mode 100644 index 0000000000..9c52a95937 --- /dev/null +++ b/arch/x86/mm/srat.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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/init.h> +#include <linux/topology.h> +#include <linux/mm.h> +#include <asm/proto.h> +#include <asm/numa.h> +#include <asm/e820/api.h> +#include <asm/apic.h> +#include <asm/uv/uv.h> + +/* Callback for Proximity Domain -> x2APIC mapping */ +void __init +acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) +{ + int pxm, node; + int apic_id; + + if (srat_disabled()) + return; + if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) { + bad_srat(); + return; + } + if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) + return; + pxm = pa->proximity_domain; + apic_id = pa->apic_id; + if (!apic_id_valid(apic_id)) { + pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", pxm, apic_id); + return; + } + node = acpi_map_pxm_to_node(pxm); + if (node < 0) { + printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); + bad_srat(); + return; + } + + if (apic_id >= MAX_LOCAL_APIC) { + printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); + return; + } + set_apicid_to_node(apic_id, node); + node_set(node, numa_nodes_parsed); + printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", + pxm, apic_id, node); +} + +/* Callback for Proximity Domain -> LAPIC mapping */ +void __init +acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) +{ + int pxm, node; + int apic_id; + + if (srat_disabled()) + return; + if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) { + bad_srat(); + return; + } + if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) + return; + pxm = pa->proximity_domain_lo; + if (acpi_srat_revision >= 2) + pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8; + node = acpi_map_pxm_to_node(pxm); + if (node < 0) { + printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); + bad_srat(); + return; + } + + if (get_uv_system_type() >= UV_X2APIC) + apic_id = (pa->apic_id << 8) | pa->local_sapic_eid; + else + apic_id = pa->apic_id; + + if (apic_id >= MAX_LOCAL_APIC) { + printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); + return; + } + + set_apicid_to_node(apic_id, node); + node_set(node, numa_nodes_parsed); + printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", + pxm, apic_id, node); +} + +int __init x86_acpi_numa_init(void) +{ + int ret; + + ret = acpi_numa_init(); + if (ret < 0) + return ret; + return srat_disabled() ? -EINVAL : 0; +} |