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 D76DF30E0D1; Fri, 12 Sep 2025 14:43:05 +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=1757688187; cv=none; b=FqvcMew+IfCDz1Crbcq26rhVJcrr8cXk8hIO12Gjr2fT9EIqlOe4c7XUn9Pm2RbbeuBmtaibJDvvi0ejygzLQEkvW2fvRQSNvOPQbaSI5H2QbdfefJZkPSvL81UC5wM8Edt1B2QasLR/LB1AptkKOr9hxLE0qokp+20kh8mQbII= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757688187; c=relaxed/simple; bh=vrIPv5i/CQ8Y+l31lRrsdhIHOYFa4QZouWNok4yLK9w=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=XszW3IQYECFqCavnEI6gxIWBBfcaLT1ErACEf1akVD97Wiz+/IF8mCOUgYG2KaN+i3iIQme8sDeQWQuycEFhJyBLcteWNvMaO0UxaqNI3oogx02urVyjC00iNTDqo9PcPaSdYU88SgTRMxYU+g1DKa3vz34UiU5Uh9CRvZ0lGZo= 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 E8C4816A3; Fri, 12 Sep 2025 07:42:56 -0700 (PDT) Received: from [10.1.196.46] (e134344.arm.com [10.1.196.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9163F3F66E; Fri, 12 Sep 2025 07:43:00 -0700 (PDT) Message-ID: <7b72615a-a1a5-4945-9199-d30b7caee70b@arm.com> Date: Fri, 12 Sep 2025 15:42:59 +0100 Precedence: bulk X-Mailing-List: linux-acpi@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: James Morse , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: 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, Jonathan Cameron , 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> From: Ben Horgan Content-Language: en-US In-Reply-To: <20250910204309.20751-20-james.morse@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi James, On 9/10/25 21:42, 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 > --- > drivers/resctrl/mpam_devices.c | 12 ++++++++++++ > drivers/resctrl/mpam_internal.h | 8 ++++++++ > 2 files changed, 20 insertions(+) > Reviewed-by: Ben Horgan Thanks, Ben