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 C6598CA5FF0 for ; Sun, 4 Oct 2026 22:11:12 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1DjzRkPglXkLnXbY7wN8PS3ogcu8ALsIIsvswqRjdFE=; b=FM8sVGclRN6JupMOjUAySbQ9nW bC7onZEiVfWbybJzH2rECEB4B22dmZFcEs1Vl5stXArC/vXyGlqKTOjgSkOJ+y1bDarJHDxDRJjCf Sy9YNDCXxFuqEesp3U6aksuNTyOMNJLiEbNucV+PC8bFad2g9E57XxSCVNOZ4NHks8llx4Og2yHaM DrFV81NHOxGbT5zv5w6+Ke+L7Yv/I5P7ihhiRvRBp5lC/2jEEtp8Bjpqm5EgQFngTsD2yzeQ8HoST QdB5yBCLFVm4HPmwgez1Qaj00/ssnRPNeAou32lb0h0rcv2nUC6K2zKN1PXWpJh6vFO4EVOen5ki3 Xrrgak+A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xDUQB-0000000FPlJ-0bbE; Sun, 04 Oct 2026 22:11:03 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xDUQA-0000000FPl4-2Ibr for linux-arm-kernel@lists.infradead.org; Sun, 04 Oct 2026 22:11:02 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 50115403D5; Sun, 4 Oct 2026 22:11:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3279B1F000FF; Sun, 4 Oct 2026 22:11:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791151862; bh=1DjzRkPglXkLnXbY7wN8PS3ogcu8ALsIIsvswqRjdFE=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=HH8fiKGNTvOUka8cytqfjPz55KfUztVmkOh/aBQdRNW0yL1QMtNWxaacH+9MBB96p RA3qPtQhJ0NHHOzurorpnZ3bBh+j+dLodHipyRX+7Qe2thTIm6VHS1yMwNLrE3GyDO i/jZJOHljB1336OzqAaLUpUZ5sX3JvfPrL1bu7vTmmbi0g2Wx46TsVUrTS28V7onHb 4h5G5grnwy/7Haf42cPVCGpEPKxs4HFkVPRMWRTJIEFjQ+1WoL0LmMWehaMmAnTEMn +U40ag21NPWOZXUrw4MLk2XVTBh2rCarZGqvuVLtBCjaK9GBOLzPqXGC8125ax68W4 1yPyJtjXpxx1Q== Date: Sun, 4 Oct 2026 23:10:58 +0100 From: Will Deacon To: Robin Murphy Cc: mark.rutland@arm.com, linux-perf-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3] perf: Add Arm Bus Monitor Unit driver Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 On Thu, Sep 17, 2026 at 02:47:12PM +0100, Robin Murphy wrote: > Arm's Bus Monitor Unit is a low-level performance analysis tool for > matching and counting transactions at interconnect interfaces. Each > BMU consists of a number of "interface monitoring units", with some > global controls to synchronise them and so permit accurate calculation > of cross-interface metrics. Each IMU contains, among other things, its > own PMU largely based on the CoreSight PMU architecture, but with some > functional incompatibilities due to the nature of how much per-event > filtering needs to be crammed in to categorise AXI/CHI transactions at > the protocol level. As such it gets an honorary home in arm_cspmu/ in > order to share the common register definitions, but for simplicity does > not try to bend the functional abstraction to fit. > > Signed-off-by: Robin Murphy > > --- > v3: > - Couple of inconsequential tweaks to shut Sashiko up about things > that would never actually happen anyway > - Drop unneeded DT patches that I can't be bothered to fix right now Please can you take a look at the Sashiko comments on this one? Will