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 104CB3D3498 for ; Tue, 8 Sep 2026 08:42:38 +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=1788856959; cv=none; b=SIbbY/u0WQ+Dw8SJJQHIV3Cqzhxg4N+HtwBq/W/ZMafptk8HUxAEk/I6WajCv3s9nMk/QcBlAusFBmzCX+yi0N5HB9kefh7lMqvD5HeGtb1do7658Kp9t4N8uR2HnNIIaIcg6EAkP1fwGyjYFiZQKzvLDexkQtX3ZX0AvYYTFxc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788856959; c=relaxed/simple; bh=cA/6g2zwe9iDW2qeL/Sd2/AinoFyunWN10Q1BHJpL7s=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=QzKBSe/JOmSw0yYxYFegT33LPoXaj+CY/9tYlvdUmpS/x9MvS8bSXDNy1kzorSFtmcc558JE5b99GBBeBiG5YEuU+CaViQdvRJzDSSDwCkla4PM2pjyhnCD7r3NFt7NH/kVvRsPYBHL8KZZ3SmyhKejC37t64NE1/i+uldukWL8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dw/zz4Je; 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="dw/zz4Je" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2C6E1F00A3D; Tue, 8 Sep 2026 08:42:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788856957; bh=RRjE+BPjF7cOEU6/jSpM7rx0de7j7s28F1L8tSrKE7w=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=dw/zz4JeePzV3HTWE08BCXCW0PEA0riRf4KmgJbgG8s3zVALAvxZ4ndQCI6PT7Tbc b/GIDtLgXFsU15TaIFeo07lWpqWcDqEqqw45k5bwD0FTNrAMQvgoC/DH09E50ZYlYx 5g5j6Bl4m9IE4YmslYUbbFYZiWs/Gt0zcqgpLqu5BHINerrjy+yhEY7h0ZCidVZj6Z Jo1aMaX2gHWFfG4jJo2NGlVZrE2J7G4eLHTc/0xvIEQn7roMdv64rSf58JthYADNny yfIjVbdfSh9gdF/85RrWFTY+w4Enwy6c+vFdAwd2UK2HafnWrkGpsb+EH/bQO2d8xh xxYt6dlR2JN0w== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1x3rPX-000000066KO-3oTu; Tue, 08 Sep 2026 08:42:36 +0000 Date: Tue, 08 Sep 2026 09:42:35 +0100 Message-ID: <867bkw3zic.wl-maz@kernel.org> From: Marc Zyngier To: Abel Vesa Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Raviteja Laggyshetty , Konrad Dybcio , Abel Vesa , Bjorn Andersson , Mostafa Saleh Subject: Re: [PATCH] interconnect: qcom: icc-rpmh: Add opt-out parameter for QoS settings In-Reply-To: <6iixty74opjqkegpdmtytffgrllcjvrmhlsv53xtackdqzvwge@6fh5onz27p6c> References: <20260907171729.1735641-1-maz@kernel.org> <87ld9c4vc2.wl-maz@kernel.org> <6iixty74opjqkegpdmtytffgrllcjvrmhlsv53xtackdqzvwge@6fh5onz27p6c> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: abel.vesa@oss.qualcomm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, raviteja.laggyshetty@oss.qualcomm.com, konrad.dybcio@oss.qualcomm.com, abelvesa@kernel.org, andersson@kernel.org, smostafa@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Tue, 08 Sep 2026 08:34:18 +0100, Abel Vesa wrote: > > On 26-09-07 22:15:09, Marc Zyngier wrote: > > On Mon, 07 Sep 2026 21:21:44 +0100, > > Abel Vesa wrote: > > > > > > On 26-09-07 18:17:29, Marc Zyngier wrote: > > > > Recent addition of QoS configuration to the X1 variants resulted in > > > > systems that spontaneously reset at boot time or under load. > > > > > > > > Given that this is both very unpleasant and hard to debug, give the > > > > affected user the option to survive such event with a module parameter. > > > > > > > > Passing "icc_rpmh.enable_qos=0" to the kernel command-line will skip the > > > > offending QoS setup. > > > > > > > > > > Lets not start doing this, please. > > > > > > Can we figure out which platform deosn't work and then maybe we can > > > add a quirk in DT per platform? > > > > We have at least 3 machines that are dysfunctional since [1] was > > merged (mini-x, sp12 and devkit). Probably some more, but I'm not > > going to be the one doing a survey. > > > > What really should happen is [1] to be reversed until QC figures out a > > set of parameters that actually works, instead of making this platform > > even more unreliable than it already is. > > I'd rather have the patch reverted than adding a module parameter which > users might not know about and distros will probably never addopt. > > > > > Just like [2] should have been reverted. > > > > Until then, we'll have to paper over this stuff. > > But a module parameter complicates things rather than just papering over. > > I suggest we get both reverted if they break existing platforms. We're in violent agreement. Thanks, M. -- Without deviation from the norm, progress is not possible.