From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3EBE5CAC582 for ; Fri, 12 Sep 2025 14:43:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=S2HOgqv/FJC6/TOhpCtbrosrzPs2S82hRhTvTKPhQ8Q=; b=LSr/k361e9vDQQvTuWNER46D/c qKdUXt+pFEPAlSwOO3y9+bxA0CKUITIKxuk+pcBfRcWjpaxsRirPOpksFVRc3bpg1zwvc+QHu6/av EyIkj6g1pG0VV6Q3vxvaKoXY7TMGCu5UdfQ/ax2xIXHzlRnTyjLtUWG889Jy644V54PDQtJ3HrSPS IgPdb3LxrO/NTMqqSYoOBJUBQNQA9lqg7LLamZ6OWudzsYOMLQJPZ2rKD9w+M8GXsRsRum9G8pTuE 2CfPnitkmrxQtEs2+gxQ5v0tI18p+VOTYGETPMiEfNgexIrPVVnTtj7YNYjS283Iijr2UbjQYOwI/ xXndN5ow==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ux4zU-00000009zCZ-27E8; Fri, 12 Sep 2025 14:43:08 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ux4zS-00000009zB2-0rWy for linux-arm-kernel@lists.infradead.org; Fri, 12 Sep 2025 14:43:07 +0000 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250912_074306_284595_889A4405 X-CRM114-Status: GOOD ( 12.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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