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 52A993B7757; Tue, 15 Sep 2026 12:39:59 +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=1789476000; cv=none; b=H2MITnlA3uDw/98OSOKg1e4Liy87afozLLwxmL/XZSHMpNahAzo/z1Iq/Q3C+Ef84nUwREf6ILeYN9kISDsauSYGkf5k9CZP4ysE+zKmTebC72hZx++/YaE+TzQiMGi7//flmD6Gdj7kRf7U3jJ011JmLL4L1MFD7XzJOjTYLwE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789476000; c=relaxed/simple; bh=6xo7YgWEi2KBLR3Lf7s3tkoITi10S8/cK3L7oyHpsWM=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=bwjw5UBan1UsMUkXEJ0gF6V4/RuWCLczdYsIxbEfYJz04191MDEGb/Y1CnPoOtZi0+xjatmXghIRzrc8oKBZpuBuPiUigMDpit96RBOPRmTpxu33Wt5cWk+Q/brFw/sdfzpMEgb+MThumaHW6mr7pBv4rzR93YkhdeWjU21s+a8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DYpdTtkI; 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="DYpdTtkI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E60A51F00893; Tue, 15 Sep 2026 12:39:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789475998; bh=R8PNvrtawzXe5CSJXiS0tWjjyZcYLcdqMXVzqN9aktE=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=DYpdTtkIyT89BtoYbA26HmTbG1wRH0HZPUbi3mxtljq0uQdcNW7jp5xSnjObKI8qC 0J284u8A1rRGkKKzLs8o31HBanlwlOQX9soSlH0/YCjI8dOxBWjAZ95Nyw+rOE7Um9 /B0LFwBvtKjSKma93zgkQX5yWW0ehTfs4KJTWUQ8wPzLkmt3f05A0WeueSXoftI8f0 vugBSsjDVaPc5Sr5LD7aYjKbKL61jDCbwE67SwXzDEY9GUwxEWbscInua0lvc5GdGE xBJo9s6iCtRcaHiuzTausKEXW+y91wCo1su5wuKSNcY8a08Xce7rn+B/augKrAo0I5 hAEjNWr230+yg== 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 1x6SS5-000000098Ca-0O2A; Tue, 15 Sep 2026 12:39:57 +0000 Date: Tue, 15 Sep 2026 13:39:56 +0100 Message-ID: <86wlsm663n.wl-maz@kernel.org> From: Marc Zyngier To: Thorsten Leemhuis Cc: Abel Vesa , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Raviteja Laggyshetty , Konrad Dybcio , Abel Vesa , Bjorn Andersson , Mostafa Saleh , Linux kernel regressions list Subject: Re: [PATCH] interconnect: qcom: icc-rpmh: Add opt-out parameter for QoS settings In-Reply-To: References: <20260907171729.1735641-1-maz@kernel.org> <87ld9c4vc2.wl-maz@kernel.org> <6iixty74opjqkegpdmtytffgrllcjvrmhlsv53xtackdqzvwge@6fh5onz27p6c> <867bkw3zic.wl-maz@kernel.org> 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: regressions@leemhuis.info, 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, regressions@lists.linux.dev X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Tue, 15 Sep 2026 13:12:30 +0100, Thorsten Leemhuis wrote: > > On 9/8/26 10:42, Marc Zyngier wrote: > > 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. > Did anyone submit those reverts? Doesn't look like it from what I see. > Do we maybe need to poke the subsystem maintainers? Done: https://lore.kernel.org/r/20260915123703.3228329-1-maz@kernel.org > Side note for the record (noticed it just by chance): afaics one fix for > [2] was submitted meanwhile: > > https://lore.kernel.org/all/20260914-x1-el2-unfuck-v1-1-00d8bc35a635@oldschoolsolutions.biz/ Ah, nice one. Hopefully this gets eventually merged. M. -- Without deviation from the norm, progress is not possible.