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riscv: export cpu/freq invariant to scheduler

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RISC-V now manages CPU topology using arch_topology which provides
CPU capacity and frequency related interfaces to access the cpu/freq
invariant in possible heterogeneous or DVFS-enabled platforms.

Here adds topology.h file to export the arch_topology interfaces for
replacing the scheduler's constant-based cpu/freq invariant accounting.

Signed-off-by: Song Shuai <suagrfillet@gmail.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Ley Foon Tan <lftan@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230323123924.3032174-1-suagrfillet@gmail.com
[Palmer: Fix the whitespace issues.]
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Song Shuai 2023-03-23 20:39:24 +08:00 committed by Palmer Dabbelt
parent eb04e72b34
commit c4b52d8b6c
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arch/riscv/include/asm/topology.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_TOPOLOGY_H
#define _ASM_RISCV_TOPOLOGY_H
#include <linux/arch_topology.h>
/* Replace task scheduler's default frequency-invariant accounting */
#define arch_scale_freq_tick topology_scale_freq_tick
#define arch_set_freq_scale topology_set_freq_scale
#define arch_scale_freq_capacity topology_get_freq_scale
#define arch_scale_freq_invariant topology_scale_freq_invariant
/* Replace task scheduler's default cpu-invariant accounting */
#define arch_scale_cpu_capacity topology_get_cpu_scale
/* Enable topology flag updates */
#define arch_update_cpu_topology topology_update_cpu_topology
#include <asm-generic/topology.h>
#endif /* _ASM_RISCV_TOPOLOGY_H */