linux-kernel - [PATCH RFC v2 17/17] acpi: riscv: Add support for RISC-V Quality of Service Controller (RQSC)

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Message-Id: <20260128-ssqosid-cbqri-v2-17-dca586b091b9@kernel.org>
Date: Wed, 28 Jan 2026 12:27:38 -0800
From: Drew Fustini <fustini@...nel.org>
To: Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
 Radim Krčmář <rkrcmar@...tanamicro.com>, 
 Samuel Holland <samuel.holland@...ive.com>, 
 Adrien Ricciardi <aricciardi@...libre.com>, 
 Nicolas Pitre <npitre@...libre.com>, 
 Kornel Dulęba <mindal@...ihalf.com>, 
 Atish Patra <atish.patra@...ux.dev>, 
 Atish Kumar Patra <atishp@...osinc.com>, 
 Vasudevan Srinivasan <vasu@...osinc.com>, Ved Shanbhogue <ved@...osinc.com>, 
 yunhui cui <cuiyunhui@...edance.com>, Chen Pei <cp0613@...ux.alibaba.com>, 
 Liu Zhiwei <zhiwei_liu@...ux.alibaba.com>, Weiwei Li <liwei1518@...il.com>, 
 guo.wenjia23@....com.cn, liu.qingtao2@....com.cn, 
 Reinette Chatre <reinette.chatre@...el.com>, 
 Tony Luck <tony.luck@...el.com>, Babu Moger <babu.moger@....com>, 
 Peter Newman <peternewman@...gle.com>, Fenghua Yu <fenghua.yu@...el.com>, 
 James Morse <james.morse@....com>, Ben Horgan <ben.horgan@....com>, 
 Dave Martin <Dave.Martin@....com>, Drew Fustini <fustini@...nel.org>, 
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 x86@...nel.org, Rob Herring <robh@...nel.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
 Robert Moore <robert.moore@...el.com>, Sunil V L <sunilvl@...tanamicro.com>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, linux-acpi@...r.kernel.org, 
 acpica-devel@...ts.linux.dev, devicetree@...r.kernel.org
Subject: [PATCH RFC v2 17/17] acpi: riscv: Add support for RISC-V Quality
 of Service Controller (RQSC)

Enable support for the RQSC table which describes the capacity and
bandwidth QoS (CBQRI) controllers in a system.

Link: https://github.com/riscv-non-isa/riscv-cbqri/releases/tag/v1.0
Link: https://github.com/riscv-non-isa/riscv-rqsc/blob/main/src/
Signed-off-by: Drew Fustini <fustini@...nel.org>
---
 drivers/acpi/riscv/init.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/acpi/riscv/init.c b/drivers/acpi/riscv/init.c
index 7c00f7995e86..784fa0c56516 100644
--- a/drivers/acpi/riscv/init.c
+++ b/drivers/acpi/riscv/init.c
@@ -6,10 +6,29 @@

 #include <linux/acpi.h>
 #include "init.h"
+#include <linux/riscv_qos.h>

 void __init acpi_arch_init(void)
 {
+	struct acpi_table_header *rqsc;
+	acpi_status status;
+	int rc;
+
 	riscv_acpi_init_gsi_mapping();
+
 	if (IS_ENABLED(CONFIG_ACPI_RIMT))
 		riscv_acpi_rimt_init();
+
+	if (!acpi_disabled) {
+		status = acpi_get_table(ACPI_SIG_RQSC, 0, &rqsc);
+		if (ACPI_FAILURE(status)) {
+			pr_err("%s(): failed to find ACPI RQSC table: %d", __func__,
+			       ACPI_FAILURE(status));
+		} else {
+			rc = acpi_parse_rqsc(rqsc);
+			if (rc < 0)
+				pr_err("%s(): failed to parse ACPI RQSC table: %d", __func__, rc);
+		}
+		acpi_put_table((struct acpi_table_header *)rqsc);
+	}
 }

-- 
2.43.0