linux-kernel - [PATCH RFC 07/19] RISC-V: QoS: define prototypes for resctrl interface

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Message-Id: <20260119-ssqosid-cbqri-v1-7-aa2a75153832@kernel.org>
Date: Mon, 19 Jan 2026 20:14:44 -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 07/19] RISC-V: QoS: define prototypes for resctrl
 interface

Define the prototypes for the resctrl interface functions that are
implemented on RISC-V.

Co-developed-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
[fustini: rebased on riscv/for-next]
Signed-off-by: Drew Fustini <fustini@...nel.org>
---
 include/linux/riscv_qos.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/include/linux/riscv_qos.h b/include/linux/riscv_qos.h
index 51c3a96bbcd0..0c551ed85fe1 100644
--- a/include/linux/riscv_qos.h
+++ b/include/linux/riscv_qos.h
@@ -3,6 +3,7 @@
 #ifndef __LINUX_RISCV_QOS_H
 #define __LINUX_RISCV_QOS_H
 
+#include <linux/resctrl_types.h>
 #include <linux/iommu.h>
 #include <linux/types.h>
 
@@ -31,4 +32,47 @@ struct cbqri_controller_info {
 
 extern struct list_head cbqri_controllers;
 
+bool resctrl_arch_alloc_capable(void);
+bool resctrl_arch_mon_capable(void);
+bool resctrl_arch_is_llc_occupancy_enabled(void);
+bool resctrl_arch_is_mbm_local_enabled(void);
+bool resctrl_arch_is_mbm_total_enabled(void);
+
+struct rdt_resource;
+/*
+ * Note about terminology between x86 (Intel RDT/AMD QoS) and RISC-V:
+ *   CLOSID on x86 is RCID on RISC-V
+ *     RMID on x86 is MCID on RISC-V
+ *      CDP on x86 is AT (access type) on RISC-V
+ */
+u32  resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
+void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
+void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg);
+void resctrl_arch_sched_in(struct task_struct *tsk);
+void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
+bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
+bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
+void resctrl_arch_reset_resources(void);
+void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, enum resctrl_event_id evtid);
+void resctrl_arch_mon_ctx_free(struct rdt_resource *r, enum resctrl_event_id evtid,
+			       void *arch_mon_ctx);
+struct rdt_domain_hdr *resctrl_arch_find_domain(struct list_head *domain_list, int id);
+
+static inline bool resctrl_arch_event_is_free_running(enum resctrl_event_id evt)
+{
+	/* must be true for resctrl L3 monitoring files to be created */
+	return true;
+}
+
+static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
+{
+	return val;
+}
+
+/* Not needed for RISC-V */
+static inline void resctrl_arch_enable_mon(void) { }
+static inline void resctrl_arch_disable_mon(void) { }
+static inline void resctrl_arch_enable_alloc(void) { }
+static inline void resctrl_arch_disable_alloc(void) { }
+
 #endif /* __LINUX_RISCV_QOS_H */

-- 
2.43.0