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1018424ace
Add support for HOTPLUG_SMT. With this the s390 specific "nosmt" kernel command line parameter handling is replaced with common code handling. This means that just specifying "nosmt" still enables smt from an architectural point of view, however only the primary (base) cpu can be set online. Enabling smt during runtime via /sys/devices/system/cpu/smt/control allows to set secondary cpus online. This way "nosmt" works like on other architectures where enabling and disabling smt during runtime is possible. If "nosmt=force" is specified smt is also still enabled from an architectural point of view, but there is no way to set secondary cpus online during runtime, also like on other architectures. In order to disable smt from architectural point of view, which was previously achieved with the s390 specific "nosmt" command line option, "smt=1" can be used. Tested-by: Mete Durlu <meted@linux.ibm.com> Reviewed-by: Mete Durlu <meted@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_TOPOLOGY_H
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#define _ASM_S390_TOPOLOGY_H
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#include <linux/cpumask.h>
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#include <asm/numa.h>
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struct sysinfo_15_1_x;
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struct cpu;
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#ifdef CONFIG_SCHED_TOPOLOGY
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struct cpu_topology_s390 {
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unsigned short thread_id;
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unsigned short core_id;
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unsigned short socket_id;
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unsigned short book_id;
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unsigned short drawer_id;
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unsigned short dedicated : 1;
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int booted_cores;
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cpumask_t thread_mask;
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cpumask_t core_mask;
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cpumask_t book_mask;
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cpumask_t drawer_mask;
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};
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extern struct cpu_topology_s390 cpu_topology[NR_CPUS];
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#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)
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#define topology_thread_id(cpu) (cpu_topology[cpu].thread_id)
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#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_mask)
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#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
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#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_mask)
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#define topology_book_id(cpu) (cpu_topology[cpu].book_id)
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#define topology_book_cpumask(cpu) (&cpu_topology[cpu].book_mask)
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#define topology_drawer_id(cpu) (cpu_topology[cpu].drawer_id)
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#define topology_drawer_cpumask(cpu) (&cpu_topology[cpu].drawer_mask)
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#define topology_cpu_dedicated(cpu) (cpu_topology[cpu].dedicated)
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#define topology_booted_cores(cpu) (cpu_topology[cpu].booted_cores)
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#define mc_capable() 1
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void topology_init_early(void);
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int topology_cpu_init(struct cpu *);
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int topology_set_cpu_management(int fc);
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void topology_schedule_update(void);
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void store_topology(struct sysinfo_15_1_x *info);
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void update_cpu_masks(void);
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void topology_expect_change(void);
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const struct cpumask *cpu_coregroup_mask(int cpu);
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#else /* CONFIG_SCHED_TOPOLOGY */
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static inline void topology_init_early(void) { }
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static inline void topology_schedule_update(void) { }
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static inline int topology_cpu_init(struct cpu *cpu) { return 0; }
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static inline int topology_cpu_dedicated(int cpu_nr) { return 0; }
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static inline int topology_booted_cores(int cpu_nr) { return 1; }
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static inline void update_cpu_masks(void) { }
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static inline void topology_expect_change(void) { }
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#endif /* CONFIG_SCHED_TOPOLOGY */
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static inline bool topology_is_primary_thread(unsigned int cpu)
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{
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return smp_get_base_cpu(cpu) == cpu;
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}
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#define topology_is_primary_thread topology_is_primary_thread
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#define POLARIZATION_UNKNOWN (-1)
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#define POLARIZATION_HRZ (0)
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#define POLARIZATION_VL (1)
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#define POLARIZATION_VM (2)
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#define POLARIZATION_VH (3)
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#define CPU_CAPACITY_HIGH SCHED_CAPACITY_SCALE
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#define CPU_CAPACITY_LOW (SCHED_CAPACITY_SCALE >> 3)
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#define SD_BOOK_INIT SD_CPU_INIT
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#ifdef CONFIG_NUMA
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#define cpu_to_node cpu_to_node
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static inline int cpu_to_node(int cpu)
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{
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return 0;
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}
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/* Returns a pointer to the cpumask of CPUs on node 'node'. */
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#define cpumask_of_node cpumask_of_node
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static inline const struct cpumask *cpumask_of_node(int node)
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{
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return cpu_possible_mask;
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}
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#define pcibus_to_node(bus) __pcibus_to_node(bus)
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#else /* !CONFIG_NUMA */
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#define numa_node_id numa_node_id
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static inline int numa_node_id(void)
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{
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return 0;
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}
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#endif /* CONFIG_NUMA */
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#include <asm-generic/topology.h>
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#endif /* _ASM_S390_TOPOLOGY_H */
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