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 D1C9ECA0EE8 for ; Wed, 17 Sep 2025 11:04:21 +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=E2kIfKkE25nwfYq0bHn9lWMVaEaYBgV2aHeXv8fsxZ0=; b=QQ3GilStzn3bahdXE8+12wispP BLmCCuFZag2b712cACnTGtspkWlSWUOY2eZ1H0y5gb21Xu3IZv8g2kqI/pGi9Vqm2IeU671rbTyf4 3WhqSqMDZO4+HJN6sgVNMM+TCGOOOqk2zGryhNci7igBz7HuB7Lw0Nqoirjwt7hQOY1yfHWJxahqc EdZrguEdt7M+A3kqPz/Nh1kZZYgvbw7nPhThAXUhy6Mkbv8Flicv99fH40KlWJeOHcTjWd5SkKnA0 phUN6qO3YbyCGP8Zef5w0079wMfGeI2uZlWI+yw75vZlfj9cZlIE4mWxp42/ofMNicERk3EbZjbBo W1kFu4Mg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uypxD-0000000B48X-3yPD; Wed, 17 Sep 2025 11:04:03 +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 1uypx4-0000000B47c-2kRT for linux-arm-kernel@lists.infradead.org; Wed, 17 Sep 2025 11:04:02 +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 E5D022696; Wed, 17 Sep 2025 04:03:40 -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 D3C293F66E; Wed, 17 Sep 2025 04:03:44 -0700 (PDT) Message-ID: Date: Wed, 17 Sep 2025 12:03:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 07/29] arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate 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> <20250910204309.20751-8-james.morse@arm.com> From: Ben Horgan Content-Language: en-US In-Reply-To: <20250910204309.20751-8-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-20250917_040354_738922_3D60DDE8 X-CRM114-Status: GOOD ( 12.92 ) 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: > Probing MPAM is convoluted. MSCs that are integrated with a CPU may > only be accessible from those CPUs, and they may not be online. > Touching the hardware early is pointless as MPAM can't be used until > the system-wide common values for num_partid and num_pmg have been > discovered. > > Start with driver probe/remove and mapping the MSC. > > CC: Carl Worth > Signed-off-by: James Morse > --- > diff --git a/drivers/resctrl/Makefile b/drivers/resctrl/Makefile > new file mode 100644 > index 000000000000..92b48fa20108 > --- /dev/null > +++ b/drivers/resctrl/Makefile > @@ -0,0 +1,4 @@ > +obj-$(CONFIG_ARM64_MPAM_DRIVER) += mpam.o > +mpam-y += mpam_devices.o > + > +cflags-$(CONFIG_ARM64_MPAM_DRIVER_DEBUG) += -DDEBUG s/cflags/ccflags/ Thanks, Ben