From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A79C840F72C for ; Sun, 4 Oct 2026 22:11:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791151863; cv=none; b=LIw+MCQJm8VfKSEPE+YQJq2gk4WtbUaCPwJmfx0qxmkdaikTHMBOnQYKg2jr6aTcvBEuDL7Ubl/5YvweFtNyz41I5DMUwgcd/AO/736tOB36RJMcSUhZSaTh175IoAChWD0gaQ/9LOB86k5jv4Yn/QPlWE86lxkg8BMRAyl4P6o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791151863; c=relaxed/simple; bh=yxf6sRAI25us8HY8zeIU+o269YB+YtRliH9Fsn6/5ks=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=an6JwmMLx9/iAoc5Y129AakEmTnVPrjVeOzdrk7AJ44GIorCkbM4cBfeMIYpgZ4iSqJg0r2b5rwXA2kekesayGpwmu0QXsEbyo5CUoXwngeN8nzXIit44pr5f2iM/UnEtc0KqD7avdIhdb1GeiGq+vxDmLmk486xXackACjEORE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HH8fiKGN; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HH8fiKGN" 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: Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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