leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Files
bb6e89df9028b2fab0ce6ac71cd9ef25b6ada32d
linux/arch/x86/include/asm/topology.h
Thomas Gleixner bb6e89df90 x86/aperfmperf: Make parts of the frequency invariance code unconditional 
The frequency invariance support is currently limited to x86/64 and SMP,
which is the vast majority of machines.

arch_scale_freq_tick() is called every tick on all CPUs and reads the APERF
and MPERF MSRs. The CPU frequency getters function do the same via dedicated
IPIs.

While it could be argued that on systems where frequency invariance support
is disabled (32bit, !SMP) the per tick read of the APERF and MPERF MSRs can
be avoided, it does not make sense to keep the extra code and the resulting
runtime issues of mass IPIs around.

As a first step split out the non frequency invariance specific
initialization code and the read MSR portion of arch_scale_freq_tick(). The
rest of the code is still conditional and guarded with a static key.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20220415161206.761988704@linutronix.de
2022-04-27 20:22:19 +02:00

231 lines
6.7 KiB
C
Raw Blame History

/*
* Written by: Matthew Dobson, IBM Corporation
*
* Copyright (C) 2002, IBM Corp.
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <colpatch@us.ibm.com>
*/
#ifndef _ASM_X86_TOPOLOGY_H
#define _ASM_X86_TOPOLOGY_H
/*
* to preserve the visibility of NUMA_NO_NODE definition,
* moved to there from here. May be used independent of
* CONFIG_NUMA.
*/
#include <linux/numa.h>
#ifdef CONFIG_NUMA
#include <linux/cpumask.h>
#include <asm/mpspec.h>
#include <asm/percpu.h>
/* Mappings between logical cpu number and node number */
DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
/*
* override generic percpu implementation of cpu_to_node
*/
extern int __cpu_to_node(int cpu);
#define cpu_to_node __cpu_to_node
extern int early_cpu_to_node(int cpu);
#else /* !CONFIG_DEBUG_PER_CPU_MAPS */
/* Same function but used if called before per_cpu areas are setup */
static inline int early_cpu_to_node(int cpu)
{
return early_per_cpu(x86_cpu_to_node_map, cpu);
}
#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
/* Mappings between node number and cpus on that node. */
extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
extern const struct cpumask *cpumask_of_node(int node);
#else
/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
static inline const struct cpumask *cpumask_of_node(int node)
{
return node_to_cpumask_map[node];
}
#endif
extern void setup_node_to_cpumask_map(void);
#define pcibus_to_node(bus) __pcibus_to_node(bus)
extern int __node_distance(int, int);
#define node_distance(a, b) __node_distance(a, b)
#else /* !CONFIG_NUMA */
static inline int numa_node_id(void)
{
return 0;
}
/*
* indicate override:
*/
#define numa_node_id numa_node_id
static inline int early_cpu_to_node(int cpu)
{
return 0;
}
static inline void setup_node_to_cpumask_map(void) { }
#endif
#include <asm-generic/topology.h>
extern const struct cpumask *cpu_coregroup_mask(int cpu);
extern const struct cpumask *cpu_clustergroup_mask(int cpu);
#define topology_logical_package_id(cpu) (cpu_data(cpu).logical_proc_id)
#define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
#define topology_logical_die_id(cpu) (cpu_data(cpu).logical_die_id)
#define topology_die_id(cpu) (cpu_data(cpu).cpu_die_id)
#define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
#define topology_ppin(cpu) (cpu_data(cpu).ppin)
extern unsigned int __max_die_per_package;
#ifdef CONFIG_SMP
#define topology_cluster_id(cpu) (per_cpu(cpu_l2c_id, cpu))
#define topology_die_cpumask(cpu) (per_cpu(cpu_die_map, cpu))
#define topology_cluster_cpumask(cpu) (cpu_clustergroup_mask(cpu))
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
extern unsigned int __max_logical_packages;
#define topology_max_packages() (__max_logical_packages)
static inline int topology_max_die_per_package(void)
{
return __max_die_per_package;
}
extern int __max_smt_threads;
static inline int topology_max_smt_threads(void)
{
return __max_smt_threads;
}
int topology_update_package_map(unsigned int apicid, unsigned int cpu);
int topology_update_die_map(unsigned int dieid, unsigned int cpu);
int topology_phys_to_logical_pkg(unsigned int pkg);
int topology_phys_to_logical_die(unsigned int die, unsigned int cpu);
bool topology_is_primary_thread(unsigned int cpu);
bool topology_smt_supported(void);
#else
#define topology_max_packages() (1)
static inline int
topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
static inline int
topology_update_die_map(unsigned int dieid, unsigned int cpu) { return 0; }
static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
static inline int topology_phys_to_logical_die(unsigned int die,
unsigned int cpu) { return 0; }
static inline int topology_max_die_per_package(void) { return 1; }
static inline int topology_max_smt_threads(void) { return 1; }
static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }
static inline bool topology_smt_supported(void) { return false; }
#endif
static inline void arch_fix_phys_package_id(int num, u32 slot)
{
}
struct pci_bus;
int x86_pci_root_bus_node(int bus);
void x86_pci_root_bus_resources(int bus, struct list_head *resources);
extern bool x86_topology_update;
#ifdef CONFIG_SCHED_MC_PRIO
#include <asm/percpu.h>
DECLARE_PER_CPU_READ_MOSTLY(int, sched_core_priority);
extern unsigned int __read_mostly sysctl_sched_itmt_enabled;
/* Interface to set priority of a cpu */
void sched_set_itmt_core_prio(int prio, int core_cpu);
/* Interface to notify scheduler that system supports ITMT */
int sched_set_itmt_support(void);
/* Interface to notify scheduler that system revokes ITMT support */
void sched_clear_itmt_support(void);
#else /* CONFIG_SCHED_MC_PRIO */
#define sysctl_sched_itmt_enabled 0
static inline void sched_set_itmt_core_prio(int prio, int core_cpu)
{
}
static inline int sched_set_itmt_support(void)
{
return 0;
}
static inline void sched_clear_itmt_support(void)
{
}
#endif /* CONFIG_SCHED_MC_PRIO */
#if defined(CONFIG_SMP) && defined(CONFIG_X86_64)
#include <asm/cpufeature.h>
DECLARE_STATIC_KEY_FALSE(arch_scale_freq_key);
#define arch_scale_freq_invariant() static_branch_likely(&arch_scale_freq_key)
DECLARE_PER_CPU(unsigned long, arch_freq_scale);
static inline long arch_scale_freq_capacity(int cpu)
{
return per_cpu(arch_freq_scale, cpu);
}
#define arch_scale_freq_capacity arch_scale_freq_capacity
extern void arch_scale_freq_tick(void);
#define arch_scale_freq_tick arch_scale_freq_tick
extern void arch_set_max_freq_ratio(bool turbo_disabled);
extern void freq_invariance_set_perf_ratio(u64 ratio, bool turbo_disabled);
#else
static inline void arch_set_max_freq_ratio(bool turbo_disabled) { }
static inline void freq_invariance_set_perf_ratio(u64 ratio, bool turbo_disabled) { }
#endif
#ifdef CONFIG_ACPI_CPPC_LIB
void init_freq_invariance_cppc(void);
#define arch_init_invariance_cppc init_freq_invariance_cppc
#endif
#endif /* _ASM_X86_TOPOLOGY_H */
Reference in New Issue View Git Blame Copy Permalink