227bbaabe6
topology_is_core_online() checks if the core a CPU belongs to
is online. The core is online if at least one of the sibling
CPUs is online. The first CPU of an online core is also online
in the common case, so this should be fairly quick.
Fixes: 73c58e7e14 ("powerpc: Add HOTPLUG_SMT support")
Signed-off-by: Nysal Jan K.A <nysal@linux.ibm.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240731030126.956210-3-nysal@linux.ibm.com
175 lines
4.1 KiB
C
175 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_TOPOLOGY_H
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#define _ASM_POWERPC_TOPOLOGY_H
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#ifdef __KERNEL__
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struct device;
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struct device_node;
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struct drmem_lmb;
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#ifdef CONFIG_NUMA
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/*
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* If zone_reclaim_mode is enabled, a RECLAIM_DISTANCE of 10 will mean that
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* all zones on all nodes will be eligible for zone_reclaim().
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*/
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#define RECLAIM_DISTANCE 10
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#include <asm/mmzone.h>
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#define cpumask_of_node(node) ((node) == -1 ? \
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cpu_all_mask : \
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node_to_cpumask_map[node])
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struct pci_bus;
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#ifdef CONFIG_PCI
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extern int pcibus_to_node(struct pci_bus *bus);
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#else
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static inline int pcibus_to_node(struct pci_bus *bus)
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{
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return -1;
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}
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#endif
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#define cpumask_of_pcibus(bus) (pcibus_to_node(bus) == -1 ? \
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cpu_all_mask : \
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cpumask_of_node(pcibus_to_node(bus)))
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int cpu_relative_distance(__be32 *cpu1_assoc, __be32 *cpu2_assoc);
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extern int __node_distance(int, int);
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#define node_distance(a, b) __node_distance(a, b)
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extern void __init dump_numa_cpu_topology(void);
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extern int sysfs_add_device_to_node(struct device *dev, int nid);
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extern void sysfs_remove_device_from_node(struct device *dev, int nid);
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static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node)
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{
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numa_cpu_lookup_table[cpu] = node;
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}
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static inline int early_cpu_to_node(int cpu)
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{
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int nid;
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nid = numa_cpu_lookup_table[cpu];
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/*
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* Fall back to node 0 if nid is unset (it should be, except bugs).
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* This allows callers to safely do NODE_DATA(early_cpu_to_node(cpu)).
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*/
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return (nid < 0) ? 0 : nid;
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}
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int of_drconf_to_nid_single(struct drmem_lmb *lmb);
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void update_numa_distance(struct device_node *node);
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extern void map_cpu_to_node(int cpu, int node);
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#ifdef CONFIG_HOTPLUG_CPU
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extern void unmap_cpu_from_node(unsigned long cpu);
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#endif /* CONFIG_HOTPLUG_CPU */
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#else
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static inline int early_cpu_to_node(int cpu) { return 0; }
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static inline void dump_numa_cpu_topology(void) {}
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static inline int sysfs_add_device_to_node(struct device *dev, int nid)
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{
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return 0;
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}
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static inline void sysfs_remove_device_from_node(struct device *dev,
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int nid)
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{
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}
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static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node) {}
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static inline int cpu_relative_distance(__be32 *cpu1_assoc, __be32 *cpu2_assoc)
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{
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return 0;
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}
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static inline int of_drconf_to_nid_single(struct drmem_lmb *lmb)
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{
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return first_online_node;
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}
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static inline void update_numa_distance(struct device_node *node) {}
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#ifdef CONFIG_SMP
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static inline void map_cpu_to_node(int cpu, int node) {}
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#ifdef CONFIG_HOTPLUG_CPU
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static inline void unmap_cpu_from_node(unsigned long cpu) {}
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#endif /* CONFIG_HOTPLUG_CPU */
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#endif /* CONFIG_SMP */
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#endif /* CONFIG_NUMA */
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#if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR)
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void find_and_update_cpu_nid(int cpu);
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extern int cpu_to_coregroup_id(int cpu);
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#else
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static inline void find_and_update_cpu_nid(int cpu) {}
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static inline int cpu_to_coregroup_id(int cpu)
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{
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#ifdef CONFIG_SMP
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return cpu_to_core_id(cpu);
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#else
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return 0;
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#endif
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}
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#endif /* CONFIG_NUMA && CONFIG_PPC_SPLPAR */
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#include <asm-generic/topology.h>
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#ifdef CONFIG_SMP
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#include <asm/cputable.h>
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#ifdef CONFIG_PPC64
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#include <asm/smp.h>
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#define topology_physical_package_id(cpu) (cpu_to_chip_id(cpu))
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#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
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#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
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#define topology_core_id(cpu) (cpu_to_core_id(cpu))
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#endif
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#endif
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#ifdef CONFIG_HOTPLUG_SMT
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#include <linux/cpu_smt.h>
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#include <linux/cpumask.h>
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#include <asm/cputhreads.h>
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static inline bool topology_is_primary_thread(unsigned int cpu)
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{
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return cpu == cpu_first_thread_sibling(cpu);
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}
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static inline bool topology_smt_thread_allowed(unsigned int cpu)
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{
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return cpu_thread_in_core(cpu) < cpu_smt_num_threads;
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}
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#define topology_is_core_online topology_is_core_online
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static inline bool topology_is_core_online(unsigned int cpu)
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{
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int i, first_cpu = cpu_first_thread_sibling(cpu);
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for (i = first_cpu; i < first_cpu + threads_per_core; ++i) {
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if (cpu_online(i))
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return true;
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}
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return false;
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_TOPOLOGY_H */
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