From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4DBD52DE71D; Fri, 3 Oct 2025 18:03:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759514615; cv=none; b=iSUJt0gzlMJiBU5qAEyY78iQrVYrziCgh4ef4ZlHxEGmPP87SPHl4BKSjtQt1aGn0mZZv8x41tKrCq/CGyoZ6GeKFraxtzurWgJ3KGEKKTQqOsDG9/GfvSri+1JRIQf5nq12RIurrHn1pvfT1vplMHQ/BmGqmeZ9+/uJdtCFDzo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759514615; c=relaxed/simple; bh=QaGD808ycN8erqbyvi0e0oc4i3eJEFsiJNnzzBh+W7U=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=I9rnB0PM4g51gBDWaxJUFAruP/mH/D/pjyLDDTJR7l1aeXRDtPZqysjBSxRg4+2FFe8didDdcY9BwqSf7nwT4xttecpGtRHWiSl0vJoLULe9NW6Q/bd/wtYaf7z2stoEzyM9g6geNUDLysOHV+jjdVzntrBJtILosR0pZp+g6vI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 824EA1596; Fri, 3 Oct 2025 11:03:23 -0700 (PDT) Received: from [10.1.197.69] (eglon.cambridge.arm.com [10.1.197.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 590C03F5A1; Fri, 3 Oct 2025 11:03:25 -0700 (PDT) Message-ID: <0d84faef-5a14-4f16-8612-d0e5dfc15985@arm.com> Date: Fri, 3 Oct 2025 19:03:25 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 19/29] arm_mpam: Use a static key to indicate when mpam is enabled To: Jonathan Cameron Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich References: <20250910204309.20751-1-james.morse@arm.com> <20250910204309.20751-20-james.morse@arm.com> <20250912131336.000014d3@huawei.com> Content-Language: en-GB From: James Morse In-Reply-To: <20250912131336.000014d3@huawei.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Jonathan, On 12/09/2025 13:13, Jonathan Cameron wrote: > On Wed, 10 Sep 2025 20:42:59 +0000 > James Morse wrote: > >> Once all the MSC have been probed, the system wide usable number of >> PARTID is known and the configuration arrays can be allocated. >> >> After this point, checking all the MSC have been probed is pointless, >> and the cpuhp callbacks should restore the configuration, instead of >> just resetting the MSC. >> >> Add a static key to enable this behaviour. This will also allow MPAM >> to be disabled in repsonse to an error, and the architecture code to >> enable/disable the context switch of the MPAM system registers. >> >> Signed-off-by: James Morse > > Seems fine to me (other than the TODO move to arch code > that should probably be resolved. That is just to make it clear this isn't where it should live, its a quirk of moving the arch code alter to reduce the number of trees this interacts with. I've dropped the word 'TODO'... > Reviewed-by: Jonathan Cameron Thanks! James