linux-kernel - [PATCH RFC 04/19] RISC-V: QoS: define properties of CBQRI controllers

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Message-Id: <20260119-ssqosid-cbqri-v1-4-aa2a75153832@kernel.org>
Date: Mon, 19 Jan 2026 20:14:41 -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, 
 Conor Dooley <conor+dt@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
 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>, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, x86@...nel.org
Subject: [PATCH RFC 04/19] RISC-V: QoS: define properties of CBQRI
 controllers

Define data structure to represent the CBQRI properties that a driver
for an CBQRI-capable controller would discover during probe.

Each instance of a CBQRI-capable controller is added to a list that the
RISC-V CBQRI resctrl implementation will consume.

Co-developed-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Drew Fustini <fustini@...nel.org>
---
 MAINTAINERS               |  1 +
 include/linux/riscv_qos.h | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e98d553bd0ca..31e536304972 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22511,6 +22511,7 @@ L:	linux-riscv@...ts.infradead.org
 S:	Supported
 F:	arch/riscv/include/asm/qos.h
 F:	arch/riscv/kernel/qos/
+F:	include/linux/riscv_qos.h
 
 RISC-V RPMI AND MPXY DRIVERS
 M:	Rahul Pathak <rahul@...mations.net>
diff --git a/include/linux/riscv_qos.h b/include/linux/riscv_qos.h
new file mode 100644
index 000000000000..51c3a96bbcd0
--- /dev/null
+++ b/include/linux/riscv_qos.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __LINUX_RISCV_QOS_H
+#define __LINUX_RISCV_QOS_H
+
+#include <linux/iommu.h>
+#include <linux/types.h>
+
+#include <asm/qos.h>
+
+enum cbqri_controller_type {
+	CBQRI_CONTROLLER_TYPE_CAPACITY,
+	CBQRI_CONTROLLER_TYPE_BANDWIDTH,
+	CBQRI_CONTROLLER_TYPE_UNKNOWN
+};
+
+struct cbqri_controller_info {
+	unsigned long addr;
+	unsigned long size;
+	enum cbqri_controller_type type;
+	u32 rcid_count;
+	u32 mcid_count;
+	struct list_head list;
+
+	struct cache_controller {
+		u32 cache_level;
+		u32 cache_size; /* in bytes */
+		struct cpumask cpu_mask;
+	} cache;
+};
+
+extern struct list_head cbqri_controllers;
+
+#endif /* __LINUX_RISCV_QOS_H */

-- 
2.43.0