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 BE71ECAC5B0 for ; Fri, 3 Oct 2025 18:04:03 +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=4eHHzocHHtz2wCKBm3r2zI/nINuL5/9x64rUy0eAOAs=; b=fMoLONaO51frD/+PN8TrYdy9N6 xTUFKEr+Oi43LWWj+m30Alaox5sFObBEZ5ZB5pROuH0Sx4jY0FYqmyrRvuvoOSOL086Kz3RZcGcMU tftIQN246W3DqwzMCM0X10yoOKjXv+tlBvqmGwe96/piL/seSMk02gH6bJnba0D9fkbJwiCZ4t1Nx nq0y2Ju13TbzYlVIN4UNbuFdmWjA82TKmdmrcJeuwxrTAn7aXbSe0AFaIscbtJPSUqZ2+5/GLxlye IsESoomuHku8+8uEgStSBB1RLgXpY439Qkw+VgTvjIdKjw+Jyn1bEIkQAc+FXHayOdHIPye+q8lhZ bS+xMH8g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v4k8L-0000000CtlF-3jGz; Fri, 03 Oct 2025 18:03:57 +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 1v4k8J-0000000CtkM-3L37 for linux-arm-kernel@lists.infradead.org; Fri, 03 Oct 2025 18:03:57 +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 62E061596; Fri, 3 Oct 2025 11:03:46 -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 F2DA63F5A1; Fri, 3 Oct 2025 11:03:48 -0700 (PDT) Message-ID: <85bef7bc-42c9-4a27-b74e-35fbbae4b39b@arm.com> Date: Fri, 3 Oct 2025 19:03:47 +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: Ben Horgan , 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> <7b72615a-a1a5-4945-9199-d30b7caee70b@arm.com> Content-Language: en-GB From: James Morse In-Reply-To: <7b72615a-a1a5-4945-9199-d30b7caee70b@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-20251003_110355_878582_701EC734 X-CRM114-Status: UNSURE ( 9.07 ) X-CRM114-Notice: Please train this message. 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 Ben, On 12/09/2025 15:42, Ben Horgan wrote: > 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. > Reviewed-by: Ben Horgan Thanks! James