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Fri, 13 Feb 2026 23:21:42 +0000 Message-ID: <01d57303-059d-4025-bb31-56d552a149e3@intel.com> Date: Fri, 13 Feb 2026 15:21:37 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 07/17] RISC-V: QoS: define prototypes for resctrl interface To: Drew Fustini , Paul Walmsley , "Palmer Dabbelt" , Albert Ou , "Alexandre Ghiti" , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Samuel Holland , Adrien Ricciardi , Nicolas Pitre , =?UTF-8?Q?Kornel_Dul=C4=99ba?= , Atish Patra , Atish Kumar Patra , Vasudevan Srinivasan , Ved Shanbhogue , yunhui cui , Chen Pei , Liu Zhiwei , Weiwei Li , , , Tony Luck , Babu Moger , Peter Newman , Fenghua Yu , James Morse , Ben Horgan , Dave Martin , , , , Rob Herring , "Rafael J. Wysocki" , Len Brown , Robert Moore , Sunil V L , Krzysztof Kozlowski , "Conor Dooley" CC: Paul Walmsley , , , References: <20260128-ssqosid-cbqri-v2-0-dca586b091b9@kernel.org> <20260128-ssqosid-cbqri-v2-7-dca586b091b9@kernel.org> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20260128-ssqosid-cbqri-v2-7-dca586b091b9@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0251.namprd03.prod.outlook.com (2603:10b6:303:b4::16) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|SA2PR11MB5001:EE_ X-MS-Office365-Filtering-Correlation-Id: 7067c1e0-86db-47f7-9c96-08de6b56a591 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014|921020|7053199007; 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> > +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); These individual event checks are no longer needed. Please refer to commit d257cc2e5c8b ("x86,fs/resctrl: Replace architecture event enabled checks") that can be found in your base commit. > + > +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); nit: the x86 and RISC-V terms are already plenty. It should not be necessary to add MPAM terms (pmg) to the mix? > +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); hmmm ... the baseline of this work is v6.19-rc4 that contains the resctrl fs/arch split. resctrl_arch_reset_resources() seems to be based on some earlier version of the split work that did not make it upstream. > +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); resctrl_arch_find_domain() does not exist in resctrl. Would resctrl's resctrl_find_domain() suffice? > + > +static inline bool resctrl_arch_event_is_free_running(enum resctrl_event_id evt) resctrl_arch_event_is_free_running() also does not exist in resctrl. > +{ > + /* 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 */ > Reinette