[PATCH RFC 10/19] RISC-V: QoS: add late_initcall to setup resctrl interface

[Drew Fustini]

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 at baylibre.com>
Signed-off-by: Adrien Ricciardi <aricciardi at baylibre.com>
Signed-off-by: Drew Fustini <fustini at kernel.org>
---
 arch/riscv/kernel/qos/qos.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/riscv/kernel/qos/qos.c b/arch/riscv/kernel/qos/qos.c
index 7b06f7ae9056..2cd5d7be1d10 100644
--- a/arch/riscv/kernel/qos/qos.c
+++ b/arch/riscv/kernel/qos/qos.c
@@ -1,5 +1,32 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#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"
+
 /* cached value of sqoscfg csr for each cpu */
 DEFINE_PER_CPU(u32, cpu_srmcfg);
+
+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);

-- 
2.43.0