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Received: from DS4PR12MB9660.namprd12.prod.outlook.com (2603:10b6:8:281::6) by SJ1PR12MB6219.namprd12.prod.outlook.com (2603:10b6:a03:456::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9434.7; Fri, 19 Dec 2025 08:39:11 +0000 Received: from DS4PR12MB9660.namprd12.prod.outlook.com ([fe80::f962:80d7:e25:bf3f]) by DS4PR12MB9660.namprd12.prod.outlook.com ([fe80::f962:80d7:e25:bf3f%3]) with mapi id 15.20.9434.001; Fri, 19 Dec 2025 08:39:11 +0000 Message-ID: <8bca8c4b-52b8-4a1d-9f21-176c994a58bb@nvidia.com> Date: Fri, 19 Dec 2025 00:38:39 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 0/5] Arm LFA: Improvements and interrupt support Content-Language: en-US To: Sudeep Holla Cc: salman.nabi@arm.com, andre.przywara@arm.com, lpieralisi@kernel.org, mark.rutland@arm.com, ardb@kernel.org, chao.gao@intel.com, linux-arm-kernel@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, sdonthineni@nvidia.com, vsethi@nvidia.com, vwadekar@nvidia.com References: <20251208221319.1524888-1-vvidwans@nvidia.com> <20251209-miniature-curassow-of-energy-b6a303@sudeepholla> From: Vedashree Vidwans In-Reply-To: <20251209-miniature-curassow-of-energy-b6a303@sudeepholla> Content-Type: text/plain; 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The series keeps >> the existing functionality but restructures and extends it to improve >> robustness, reviewability, and future extensibility.​ >> >> The SMCCC usage in the driver is updated to consistently use the >> SMCCC 1.2 register-based calling convention, consolidating arguments >> and results into a single struct to reduce stack usage and simplify >> the SMC interface. The patches also split the original changes into >> focused pieces and document the device node bindings in the commit >> messages, making it easier to follow and validate the implementation >> against the specification.​ >> >> The kernel driver is registered as a platform driver in accordence to >> the LFA device defined by the specification [3]. The driver now extends >> interface for interrupt-based enablement of LFA. During LFA, the >> interrupt >> thread refreshes firmware component details after each activation step >> and iterates over all activable components until no further activation >> is pending, matching the spec’s allowance for component detail changes >> after activation. This ensures that sysfs exposure of LFA components >> remains consistent with the authoritative information provided by the >> secure firmware.​ >> >> The handling of CPU rendezvous is adjusted so that the kernel now >> honors the rendezvous policy chosen by the firmware, instead of >> unconditionally forcing a rendezvous. This reflects experience with >> existing firmware deployments where mandatory rendezvous is not >> required, while still allowing the firmware to request it when >> needed.​ >> >> Thank you, >> Veda >> >> [1] https://lore.kernel.org/lkml/20250926123145.268728-1-salman.nabi@arm.com/ >> [2] https://lkml.org/lkml/2025/10/8/980 >> [3] https://developer.arm.com/documentation/den0147/latest/ >> >> Vedashree Vidwans (5): >> firmware: smccc: LFA: use smcc 1.2 >> firmware: smccc: LFA: refactor >> firmware: smccc: add timeout, touch wdt >> firmware: smccc: register as platform driver >> firmware: smccc: lfa: refresh fw details >> >> drivers/firmware/smccc/Kconfig | 3 +- >> drivers/firmware/smccc/lfa_fw.c | 478 +++++++++++++++++++++++++------- > > Same comment as before[1], looks like the feedback got ignored or missed. > > -- > Regards, > Sudeep > > [1]https://lore.kernel.org/all/20251009-calculating-glorious-oriole- > ceccf6@sudeepholla Thank you for your comment. I did include DT binding in commit message of the patch. Please let me know if there's anything else I can elaborate. Regards, Veda