linux-kernel - [RFC PATCH] riscv: export cpu/freq invariant to scheduler

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Message-Id: <20230322061856.2774840-1-suagrfillet@gmail.com>
Date:   Wed, 22 Mar 2023 14:18:56 +0800
From:   Song Shuai <suagrfillet@...il.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, conor.dooley@...rochip.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Song Shuai <suagrfillet@...il.com>
Subject: [RFC PATCH] riscv: export cpu/freq invariant to scheduler

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@...il.com>
---
 arch/riscv/include/asm/topology.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 arch/riscv/include/asm/topology.h

diff --git a/arch/riscv/include/asm/topology.h b/arch/riscv/include/asm/topology.h
new file mode 100644
index 000000000000..14bbd2472af6
--- /dev/null
+++ b/arch/riscv/include/asm/topology.h
@@ -0,0 +1,19 @@
+/* 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
+#define arch_update_cpu_topology topology_update_cpu_topology
+
+
+#include <asm-generic/topology.h>
+#endif /* __ASM_RISCV_TOPOLOGY_H */
-- 
2.20.1