linux-kernel - [RFC PATCH 05/21] RISC-V: QoS: define prototypes for resctrl interface

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Message-Id: <20230419111111.477118-6-dfustini@baylibre.com>
Date:   Wed, 19 Apr 2023 04:10:55 -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 05/21] 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>
Signed-off-by: Drew Fustini <dfustini@...libre.com>
---
 include/linux/riscv_qos.h | 58 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/include/linux/riscv_qos.h b/include/linux/riscv_qos.h
index 95016810b575..537e503a8e99 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 +32,61 @@ 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
+ */
+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level ignored);
+bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
+bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
+int  resctrl_arch_mon_ctx_alloc_no_wait(struct rdt_resource *r, int evtid);
+void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid, int ctx);
+void resctrl_arch_reset_resources(void);
+void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
+u32  resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
+int  resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable);
+void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
+void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid);
+void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg);
+u32  resctrl_arch_system_num_rmid_idx(void);
+void resctrl_sched_in(void);
+
+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;
+}
+
+/* Pseudo lock is not supported on RISC-V */
+static inline int resctrl_arch_pseudo_lock_fn(void *_plr) { return 0; }
+static inline int resctrl_arch_measure_l2_residency(void *_plr) { return 0; }
+static inline int resctrl_arch_measure_l3_residency(void *_plr) { return 0; }
+static inline int resctrl_arch_measure_cycles_lat_fn(void *_plr) { return 0; }
+static inline u64 resctrl_arch_get_prefetch_disable_bits(void) { return 0; }
+
+/* Not needed for RISC-V */
+bool resctrl_arch_match_iommu_closid(struct iommu_group *group, u32 closid);
+bool resctrl_arch_match_iommu_closid_rmid(struct iommu_group *group, u32 closid, u32 rmid);
+int  resctrl_arch_set_iommu_closid_rmid(struct iommu_group *group, u32 closid, u32 rmid);
+
+/* 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 */
-- 
2.34.1