linux-kernel - [RFC PATCH 09/21] RISC-V: QoS: add late

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Date:   Wed, 19 Apr 2023 04:10:59 -0700
From:   Drew Fustini <dfustini@...libre.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Ved Shanbhogue <ved@...osinc.com>,
        Kornel Dulęba <mindal@...ihalf.com>,
        Adrien Ricciardi <aricciardi@...libre.com>,
        Nicolas Pitre <npitre@...libre.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Babu Moger <babu.moger@....com>,
        Peter Newman <peternewman@...gle.com>, x86@...nel.org,
        Rob Herring <robh+dt@...nel.org>,
        James Morse <james.morse@....com>
Cc:     Drew Fustini <dfustini@...libre.com>
Subject: [RFC PATCH 09/21] RISC-V: QoS: add late_initcall to setup resctrl interface

Add late_initcall which checks if the Ssqosid extension is present, and
if so, calls resctrl setup and sets cpu hotplug state to "qos:online".

Co-developed-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Drew Fustini <dfustini@...libre.com>
---
 arch/riscv/kernel/qos/qos.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 arch/riscv/kernel/qos/qos.c

diff --git a/arch/riscv/kernel/qos/qos.c b/arch/riscv/kernel/qos/qos.c
new file mode 100644
index 000000000000..0b5fde06cbe1
--- /dev/null
+++ b/arch/riscv/kernel/qos/qos.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (C) 2023 Rivos Inc.
+
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/riscv_qos.h>
+
+#include <asm/csr.h>
+#include <asm/qos.h>
+
+#include "internal.h"
+
+static int __init qos_arch_late_init(void)
+{
+	int err;
+
+	if (!riscv_isa_extension_available(NULL, SSQOSID))
+		return -ENODEV;
+
+	err = qos_resctrl_setup();
+	if (err != 0)
+		return err;
+
+	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "qos:online", qos_resctrl_online_cpu,
+			  qos_resctrl_offline_cpu);
+
+	return err;
+}
+late_initcall(qos_arch_late_init);
-- 
2.34.1