From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FB6838E8B7 for ; Thu, 2 Jul 2026 10:25:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782987905; cv=none; b=teGNGUQ9osj88B2VYHsfPOM/ticTICT6bFogygQxmEV8ntZwx4xFWmEkn1gKi+SoY385aNhpMMZXgYeJHfr636s0ndFbcgYYyRKILW4pr997Ez91TiJVO5+qqZcd32iVDOSjOEfGtB3XDmrXOjrK1qHx/RlWvJ7B/ipwSAlmZIs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782987905; c=relaxed/simple; bh=2rNwoyE23k8p6TjFhIe1ZNDvsY6wNFfuQUQ6rt4mxB0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YgoHILn23+wYAyBKwkd4T7MS5lwKMKH8HLLsanKS23kldpPvpLtP/9RYGmA19F2GutgRbGTUXQrRII/S8qc25EGIJB6AZV66cCAAV2EarOiGxSLThvNtGoNbWe5K6nt7ftXZT48oXXrHdrEytQk+IWDe4Epm4uBufLYi82GapdM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OdnOh8Pj; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OdnOh8Pj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F3681F000E9; Thu, 2 Jul 2026 10:25:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782987903; bh=1j+IPYjqAjXItJ1ccDg2YxEejrAuFj8azFPOIgERnP0=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=OdnOh8PjBa91vS/0fNCvOCjZKRnmojVrDLhxi7+Ycw0EVkKY06kQph7ZlD4o7ROg7 Va5/UnhwyJn88c66RhQ1N66a9YmyFWoHlL+LyPw4B8hZ7M4R9KaqQx1ezcIZ/6Ibia VC+ItwaoTtF2NuvF9pEIvM1QeZpvE51GnaHq6VSDN1+yizIb2KrTwXpY7wzNeIYFFv 4YGBKycXxQgxnZikC1LxI7/yppLowYscr2fK8wj0Z/KCiwyq5eWJsbPZfMqDn0hOeD 7vFdXMEsGSZMP4l50C65oaIBH+mMUZTmLgsBoj3Hlk2YZV9pe/KhCm1g3DSdeVUrkX HCk21bajYAjIQ== Date: Thu, 2 Jul 2026 11:25:00 +0100 From: Sudeep Holla To: Huisong Li Cc: "Rafael J. Wysocki" , MyungJoo Ham , Sudeep Holla , Kyungmin Park , Chanwoo Choi , linux-acpi@vger.kernel.org Subject: Re: [PATCH 4/6] devfreq: hisi_uncore: Preserve PCC shared memory signature Message-ID: <20260702-nondescript-scrupulous-dalmatian-da23be@sudeepholla> References: <20260627-acpi_pcc_signature-v1-0-c1b7268d4fdc@kernel.org> <20260627-acpi_pcc_signature-v1-4-c1b7268d4fdc@kernel.org> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260627-acpi_pcc_signature-v1-4-c1b7268d4fdc@kernel.org> On Sat, Jun 27, 2026 at 05:37:32PM +0100, Sudeep Holla wrote: > ACPI specification defines the generic PCC shared memory signature as > the PCC base signature ORed with the subspace ID. > > ACPI 6.6 added clarification that the signature is populated by the > platform and verified by OSPM. > > The PCC mailbox controller now validates the signature when the channel > is requested. Stop copying a complete local PCC header into shared > memory and write only the command, status and payload fields, leaving > the platform-populated signature intact. > Based on the discussions in 1/6, I assume 4/6 and 5/6 doesn't work well for Hisilicon platforms. So I will drop them. I will just post 1/6 reducing it to a warning. -- Regards, Sudeep