kernel/cpu/topology.c

1 // SPDX-License-Identifier: GPL-2.0-only
5  * The APIC IDs describe the system topology in multiple domain levels.
11  * The root space contains the package (socket) IDs.
49 u32 cpuid_to_apicid[] __ro_after_init = { [0 ... NR_CPUS - 1] = BAD_APICID, };
80 	if (!(apicid & (__max_threads_per_core - 1)))  in cpu_mark_primary_thread()
95 	return apicid & (UINT_MAX << x86_topo_system.dom_shifts[dom - 1]);  in topo_apicid()
107 	return -ENODEV;  in topo_lookup_cpuid()
231 		 * of the APICs via firmware parsers or VM guest  in topo_register_apic()
246 		 * on bare metal. Allow the bogosity in a guest.  in topo_register_apic()
250 			pr_info_once("Ignoring hot-pluggable APIC ID %x in present package.\n",  in topo_register_apic()
269  * topology_register_apic - Register an APIC in early topology maps
277 		pr_err_once("APIC ID %x exceeds kernel limit of: %x\n", apic_id, MAX_LOCAL_APIC - 1);  in topology_register_apic()
298  * topology_register_boot_apic - Register the boot CPU APIC
312  * topology_get_logical_id - Retrieve the logical ID at a given topology domain level
318  * real APIC IDs and backshifted normalized APIC IDs work correctly.
321  *  - >= 0:	The requested logical ID
322  *  - -ERANGE:	@apicid is out of range
323  *  - -ENODEV:	@apicid is not registered
331 		return -ERANGE;  in topology_get_logical_id()
333 		return -ENODEV;  in topology_get_logical_id()
340  * topology_unit_count - Retrieve the count of specified units at a given topology domain level
376  * topology_hotplug_apic - Handle a physical hotplugged APIC after boot
385 		return -EINVAL;  in topology_hotplug_apic()
389 		return -ENODEV;  in topology_hotplug_apic()
393 		return -ENOSPC;  in topology_hotplug_apic()
402  * topology_hotunplug_apic - Remove a physical hotplugged APIC after boot
422  * topology_apply_cmdline_limits_early - Apply topology command line limits early
481 			disabled += assigned - nr_cpu_ids;  in topology_init_possible_cpus()
491 	disabled = allowed - assigned;  in topology_init_possible_cpus()
502 	__max_dies_per_package = 1U << (get_count_order(cntb) - get_count_order(cnta));  in topology_init_possible_cpus()
519 	pr_info("Num. cores per package:   %3u\n", __num_cores_per_package);  in topology_init_possible_cpus()
521 	pr_info("Num. threads per package: %3u\n", __num_threads_per_package);  in topology_init_possible_cpus()
530 	/* Assign CPU numbers to non-present CPUs */  in topology_init_possible_cpus()
531 	for (apicid = 0; disabled; disabled--, apicid++) {  in topology_init_possible_cpus()