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=-24.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable 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 9D9DBC433FE for ; Thu, 16 Sep 2021 06:54:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E86161178 for ; Thu, 16 Sep 2021 06:54:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234722AbhIPGzv (ORCPT ); Thu, 16 Sep 2021 02:55:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:37896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234539AbhIPGzt (ORCPT ); Thu, 16 Sep 2021 02:55:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E36F561130; Thu, 16 Sep 2021 06:54:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631775269; bh=Ol1XFd62XpvtwjSoE4VloV0AF34Y5shkTI/ViuSsdLo=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=OAVFoWAxrGMI7fZOS50r73OnNiCQKnzKHeEcCiYsxSOjL16q6UDKegWRRVIHC9hrL bhnD0qQHjqimKu8I15pJqOgeeuAeJD0JEilgZx+cUEhv588hT96G9e3gMpYvVA7olA HE1fwNroJmBXrZJWdA4zv6XFrwAy/HJOfipE5K7UNvl1cRsvsokECE0mJdu54AbccO QkuoA03inJO8sGbrxNQyIQEi/8wfJx07TSiNYrghGJI16eHD4QWyyCWp42V5GeRkf7 zTY3XJR6whJSmJ0U3VeDc+mRxmN2+AVkvE7b7+ofeAHO/ANgRuP3vBzVb/VBCFukZF jj2kaqh+Iz+ug== Subject: Re: [PATCH v3] MIPS: add support for buggy MT7621S core detection To: Sergio Paracuellos Cc: Ilya Lipnitskiy , linux-kernel , "open list:MIPS" , liwei391@huawei.com, macro@orcam.me.uk, nbd@nbd.name, Thomas Bogendoerfer , yangtiezhu@loongson.cn References: <4d9e3b39-7caa-d372-5d7b-42dcec36fec7@kernel.org> From: Greg Ungerer Message-ID: <39287d82-0d02-92e8-d12a-085998d16acf@kernel.org> Date: Thu, 16 Sep 2021 16:54:25 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sergio, On 16/9/21 4:33 pm, Sergio Paracuellos wrote: > On Thu, Sep 16, 2021 at 4:57 AM Greg Ungerer wrote: >> >> Hi Ilya, >> >>> Most MT7621 SoCs have 2 cores, which is detected and supported properly >>> by CPS. >>> >>> Unfortunately, MT7621 SoC has a less common S variant with only one core. >>> On MT7621S, GCR_CONFIG still reports 2 cores, which leads to hangs when >>> starting SMP. CPULAUNCH registers can be used in that case to detect the >>> absence of the second core and override the GCR_CONFIG PCORES field. >>> >>> Rework a long-standing OpenWrt patch to override the value of >>> mips_cps_numcores on single-core MT7621 systems. >>> >>> Tested on a dual-core MT7621 device (Ubiquiti ER-X) and a single-core >>> MT7621 device (Netgear R6220). >> >> This is breaking core detection on my MT7621 based platforms. >> I only get 2 cores detected now running 5.13. Reverting this change gives >> me 4 cores back. > > I also have a 4 core mt7621 based board and this patch change does not > have problems for me. Let me know if you need me to check something > from my board. > > I noticed that on boot the following message appears and might be > related with the way used here to make the core number detection: > > [ 0.000000] VPE topology {2,2} total 4 > > Is this the same for your board? When booting with this patch applied I get: VPE topology {2} total 2 with patch reverted I get: VPE topology {2,2} total 4 Regards Greg > Best regards, > Sergio Paracuellos > >> >> From a fully working (pre-change) system I get: >> >> # cat /proc/cpuinfo >> system type : MediaTek MT7621 ver:1 eco:3 >> machine : Digi EX15 >> processor : 0 >> cpu model : MIPS 1004Kc V2.15 >> BogoMIPS : 586.13 >> wait instruction : yes >> microsecond timers : yes >> tlb_entries : 32 >> extra interrupt vector : yes >> hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] >> isa : mips1 mips2 mips32r1 mips32r2 >> ASEs implemented : mips16 dsp mt >> shadow register sets : 1 >> kscratch registers : 0 >> package : 0 >> core : 0 >> VPE : 0 >> VCED exceptions : not available >> VCEI exceptions : not available >> >> processor : 1 >> cpu model : MIPS 1004Kc V2.15 >> BogoMIPS : 586.13 >> wait instruction : yes >> microsecond timers : yes >> tlb_entries : 32 >> extra interrupt vector : yes >> hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] >> isa : mips1 mips2 mips32r1 mips32r2 >> ASEs implemented : mips16 dsp mt >> shadow register sets : 1 >> kscratch registers : 0 >> package : 0 >> core : 0 >> VPE : 1 >> VCED exceptions : not available >> VCEI exceptions : not available >> >> processor : 2 >> cpu model : MIPS 1004Kc V2.15 >> BogoMIPS : 586.13 >> wait instruction : yes >> microsecond timers : yes >> tlb_entries : 32 >> extra interrupt vector : yes >> hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] >> isa : mips1 mips2 mips32r1 mips32r2 >> ASEs implemented : mips16 dsp mt >> shadow register sets : 1 >> kscratch registers : 0 >> package : 0 >> core : 1 >> VPE : 0 >> VCED exceptions : not available >> VCEI exceptions : not available >> >> processor : 3 >> cpu model : MIPS 1004Kc V2.15 >> BogoMIPS : 586.13 >> wait instruction : yes >> microsecond timers : yes >> tlb_entries : 32 >> extra interrupt vector : yes >> hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] >> isa : mips1 mips2 mips32r1 mips32r2 >> ASEs implemented : mips16 dsp mt >> shadow register sets : 1 >> kscratch registers : 0 >> package : 0 >> core : 1 >> VPE : 1 >> VCED exceptions : not available >> VCEI exceptions : not available >> >> >> After this patch is applied: >> >> # cat /proc/cpuinfo >> system type : MediaTek MT7621 ver:1 eco:3 >> machine : Digi EX15 >> processor : 0 >> cpu model : MIPS 1004Kc V2.15 >> BogoMIPS : 586.13 >> wait instruction : yes >> microsecond timers : yes >> tlb_entries : 32 >> extra interrupt vector : yes >> hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] >> isa : mips1 mips2 mips32r1 mips32r2 >> ASEs implemented : mips16 dsp mt >> shadow register sets : 1 >> kscratch registers : 0 >> package : 0 >> core : 0 >> VPE : 0 >> VCED exceptions : not available >> VCEI exceptions : not available >> >> processor : 1 >> cpu model : MIPS 1004Kc V2.15 >> BogoMIPS : 586.13 >> wait instruction : yes >> microsecond timers : yes >> tlb_entries : 32 >> extra interrupt vector : yes >> hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] >> isa : mips1 mips2 mips32r1 mips32r2 >> ASEs implemented : mips16 dsp mt >> shadow register sets : 1 >> kscratch registers : 0 >> package : 0 >> core : 0 >> VPE : 1 >> VCED exceptions : not available >> VCEI exceptions : not available >> >> Any ideas? >> >> Regards >> Greg >> >> >>> Original 4.14 OpenWrt patch: >>> Link: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=4cdbc90a376dd0555201c1434a2081e055e9ceb7 >>> Current 5.10 OpenWrt patch: >>> Link: https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/ramips/patches-5.10/320-mt7621-core-detect-hack.patch;h=c63f0f4c1ec742e24d8480e80553863744b58f6a;hb=10267e17299806f9885d086147878f6c492cb904 >>> >>> Suggested-by: Felix Fietkau >>> Signed-off-by: Ilya Lipnitskiy >>> --- >>> arch/mips/include/asm/mips-cps.h | 23 ++++++++++++++++++++++- >>> 1 file changed, 22 insertions(+), 1 deletion(-) >>> >>> diff --git a/arch/mips/include/asm/mips-cps.h b/arch/mips/include/asm/mips-cps.h >>> index fd43d876892e..35fb8ee6dd33 100644 >>> --- a/arch/mips/include/asm/mips-cps.h >>> +++ b/arch/mips/include/asm/mips-cps.h >>> @@ -10,6 +10,8 @@ >>> #include >>> #include >>> >>> +#include >>> + >>> extern unsigned long __cps_access_bad_size(void) >>> __compiletime_error("Bad size for CPS accessor"); >>> >>> @@ -165,11 +167,30 @@ static inline uint64_t mips_cps_cluster_config(unsigned int cluster) >>> */ >>> static inline unsigned int mips_cps_numcores(unsigned int cluster) >>> { >>> + unsigned int ncores; >>> + >>> if (!mips_cm_present()) >>> return 0; >>> >>> /* Add one before masking to handle 0xff indicating no cores */ >>> - return (mips_cps_cluster_config(cluster) + 1) & CM_GCR_CONFIG_PCORES; >>> + ncores = (mips_cps_cluster_config(cluster) + 1) & CM_GCR_CONFIG_PCORES; >>> + >>> + if (IS_ENABLED(CONFIG_SOC_MT7621)) { >>> + struct cpulaunch *launch; >>> + >>> + /* >>> + * Ralink MT7621S SoC is single core, but the GCR_CONFIG method >>> + * always reports 2 cores. Check the second core's LAUNCH_FREADY >>> + * flag to detect if the second core is missing. This method >>> + * only works before the core has been started. >>> + */ >>> + launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH); >>> + launch += 2; /* MT7621 has 2 VPEs per core */ >>> + if (!(launch->flags & LAUNCH_FREADY)) >>> + ncores = 1; >>> + } >>> + >>> + return ncores; >>> } >>> >>> /** >>> -- >>> 2.31.1 >>