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 X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54FE4CA9EC0 for ; Wed, 30 Oct 2019 08:14:24 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 1AC2C20717 for ; Wed, 30 Oct 2019 08:14:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JVEevc75"; 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bh=RYPYP+F8gVPZ8o0ZAvxHAkBE0tiwCokEgPwCU2Q5Xvs=; h=Subject:To:Cc:From:Openpgp:Autocrypt:Date:From; b=XwzPtGU5IVpGfZWEtPy45pSQGa0aum2pbL5TVRTccKHrXRuCSJOTDRBipp74ZSz8k lJOnmslyEn6kTZVmLZS7aTvSvx0IXz+KKl8+E4/5rCunGP4uc3dkdb/LA69X/HuQ9d fJAxekLY+AXE4B5B7B1xcGx1tiYxlV3xE86D/6O2wqPR4PhBdt1BpaW980ET4hGd5V 0YZzd1VXhfUUGbccFz54z/eg2WdQMDvivvuG0Hulx6JCcu27R0xPhZbHM3+tpZN3qm RkeasnKicul6dxpqUh3AU3PoAL+21EAGbr97fzZYEBOFTgw11/c2FC2djEvy8QGTNV l6xau4s4yH+Lw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4731Sg5CdRz6tm6; Wed, 30 Oct 2019 09:14:11 +0100 (CET) Subject: Re: [RFC 0/2] Add workaround for core wake-up on IPI for i.MX8MQ To: Abel Vesa References: <20190610121346.15779-1-abel.vesa@nxp.com> <7d3a868a-768c-3cb1-c6d8-bf5fcd1ddd1c@posteo.de> <20191030080727.7pcvhd4466dproy4@fsr-ub1664-175> From: Martin Kepplinger Openpgp: preference=signencrypt Autocrypt: addr=martink@posteo.de; keydata= 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qYLO7fE5+mW4vV1HX2oJmMPX6YDHl6WouLsGtmAk5SOZRv9cj+sMsGmgVD/rE0m4MDhROLV3 54Rl5w4S7uZjXEFCS8o1cvp6yrHuV2J5os0B/jBSSwD5MRSXZc+7zimMsxRubQUD6xSca8yS EKfxh1C0RtyA1irh4iU6Mdb6HvNTYbn+mb4WbE0AnHuKJdpRj0pDeyegTPevftHEQNy9Nj0o pqHDETOTYx/nw49VpXg8SxGJqeuYStJR+amX3dqBu1krWvktrF4i0U6P47aFYUs0N6clGUFj BfCUkKIfEz87bveFlk+g/wvmnni5eFpLkQm5XZfOBuLdURvDcZmv4ScMLtc0TbBSueUP/DZb pHNViNVPohfhJqY2VX4xZfT/V9gK61+pmXzoFIqYmOVal+Q8rPLOOEZBVmtNlicoC7jvWFG/ z/oPHkm5kmAMKdhqc3HcMOt5Ey7+erpN9o56Qy3GA1hv/ygOvLT1QUdsYcuxafqgGg== Message-ID: <0c023990-4482-fc42-30ba-3e801693dbec@posteo.de> Date: Wed, 30 Oct 2019 09:14:11 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20191030080727.7pcvhd4466dproy4@fsr-ub1664-175> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191030_011420_094641_0350D3AF X-CRM114-Status: GOOD ( 25.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , "devicetree@vger.kernel.org" , Lorenzo Pieralisi , Jacky Bai , Carlo Caione , Marc Zyngier , Fabio Estevam , Sascha Hauer , "linux-kernel@vger.kernel.org" , Rob Herring , dl-linux-imx , Pengutronix Kernel Team , Abel Vesa , Thomas Gleixner , Leonard Crestez , Shawn Guo , "linux-arm-kernel@lists.infradead.org" , Lucas Stach Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 30.10.19 09:08, Abel Vesa wrote: > On 19-10-30 07:11:37, Martin Kepplinger wrote: >> On 23.06.19 13:47, Martin Kepplinger wrote: >>> On 10.06.19 14:13, Abel Vesa wrote: >>>> This is another alternative for the RFC: >>>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2019%2F3%2F27%2F545&data=02%7C01%7Cabel.vesa%40nxp.com%7Cf5f8d8dd37974234fcb108d75d000944%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C637080127051582184&sdata=qZEo1fY1lkTjqZWuuQftYJ5euEsSxjEAqGILCY8ChnU%3D&reserved=0 >>>> >>>> This new workaround proposal is a little bit more hacky but more contained >>>> since everything is done within the irq-imx-gpcv2 driver. >>>> >>>> Basically, it 'hijacks' the registered gic_raise_softirq __smp_cross_call >>>> handler and registers instead a wrapper which calls in the 'hijacked' >>>> handler, after that calling into EL3 which will take care of the actual >>>> wake up. This time, instead of expanding the PSCI ABI, we use a new vendor SIP. >>>> >>>> I also have the patches ready for TF-A but I'll hold on to them until I see if >>>> this has a chance of getting in. >>> >> >> Hi Abel, >> >> Running this workaround doesn't seem to work anymore on 5.4-rcX. Linux >> doesn't boot, with ATF unchanged (includes your workaround changes). I >> can try to add more details to this... >> > > This is happening because the system counter is now enabled on 8mq. > And since the irq-imx-gpcv2 is using as irq_set_affinity the > irq_chip_set_affinity_parent. This is because the actual implementation > of the driver relies on GIC to set the right affinity. On a SoC > that has the wake_request signales linked to the power controller this > works fine. Since the system counter is actually the tick broadcast > device and the set affinity relies only on GIC, the cores can't be > woken up by the broadcast interrupt. > >> Have you tested this for 5.4? Could you update this workaround? Please >> let me know if I missed any earlier update on this (having a cpu-sleep >> idle state). >> > > The solution is to implement the set affinity in the irq-imx-gpcv2 driver > which would allow the gpc to wake up the target core when the broadcast > irq arrives. > > I have a patch for this. I just need to clean it up a little bit. > Unfortunately, it won't go upstream since everuone thinks the gic > should be the one to control the affinity. This obviously doesn't work > on 8mq. I see and that's fine for the moment. > > Currently, I'm at ELCE in Lyon. Will get back at the office tomorrow > and sned you what I have. > Thanks for answering so quickly. I'll test as soon as you can send that update. thanks for this work, martin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel