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[2620:137:e000::1:20]) by mx.google.com with ESMTP id hd11-20020a170907968b00b0073d7884a3c8si5103927ejc.594.2022.08.22.17.44.05; Mon, 22 Aug 2022 17:44:30 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@jms.id.au header.s=google header.b=MQcWGSiB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238328AbiHWAWw (ORCPT + 99 others); Mon, 22 Aug 2022 20:22:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232063AbiHWAWt (ORCPT ); Mon, 22 Aug 2022 20:22:49 -0400 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7C8722715C for ; Mon, 22 Aug 2022 17:22:48 -0700 (PDT) Received: by mail-wr1-x430.google.com with SMTP id u5so7297177wrt.11 for ; Mon, 22 Aug 2022 17:22:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jms.id.au; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc; bh=nNby+4AsStJg1pa9lu4cTHlV8sbD7whkWK8yDLBtezw=; b=MQcWGSiBMMTtQE2GPz2XbhcXsSuLBkLtY+yT50NkCKsbSZn7bJ2MMcqFcP0eqIHT8A 3aCLwQcySmRjqbgzHNCMkB19+0BxDjgJ89DJfia/lb+pcHVr0ydhunwKbFTE3/ZvCruf 2GOA8UPY1ttlodvuSAPPxNsRYZGhUfZNbmgp8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc; bh=nNby+4AsStJg1pa9lu4cTHlV8sbD7whkWK8yDLBtezw=; b=dMxKVrTRxFp/GW/VBDmSaHZhQfiKWgiEGYJdGxbSPbuotBcqtWwzE1d5hUgYSwWIfr lqXXgZpvBi1OS5KMyJEZdYQCXCSmkGFXzGEskruz7Xsb5JJVxUkol72eg5iqOaPG9wA4 d5+Ry66r/Zo0U4lXztqxtCDdn4XQt3/1+7KE47LjbyCx4AZwF0Wre64VQBxMdTsJHAr9 W/foWO66Z0XG5unTVqS6p/ILjUlVxMJ9UWbP2sd3Vq5wsi9vYJL0FzzzF3KaFNR1pN4Q UcO1jaYBwprjwVZA7/v3x0yTgzbS6ZmUqsnNRl9pjffpHJ2T9X3V0/ba6cNC9esuDsNf 0mGg== X-Gm-Message-State: ACgBeo3mzY1FkVqJKt8Y4bI3JHcT2FpQ1y1lcEEsRpIJ0H0a/Ty3vh9V gLnM5PSKVnd1YcJAFkipuB9dbSE/2tt6Z30OZVc= X-Received: by 2002:a5d:47ab:0:b0:223:60ee:6c12 with SMTP id 11-20020a5d47ab000000b0022360ee6c12mr11764837wrb.315.1661214167010; Mon, 22 Aug 2022 17:22:47 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Joel Stanley Date: Tue, 23 Aug 2022 00:22:34 +0000 Message-ID: Subject: Re: [PATCH 0/3] aspeed:lpc: Fix lpc-snoop probe exception To: Igor Kononenko Cc: Corey Minyard , Andrew Jeffery , openipmi-developer@lists.sourceforge.net, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 21 Aug 2022 at 16:07, Igor Kononenko wrote: > > The bmc might be rebooted while the host is still reachable and the host > might send requests through configured lpc-kcs channels in same time. > That leads to raise lpc-snoop/lpc-kcs interrupts that haven't adjusted IRQ > handlers yet on next early kernel boot, because on the aspeed-chip reboot > might keep lpc-registers on a unclean state that is configured on the last > boot. Thanks for the bug report and the patches Igor. When you resend then please add a Fixes: line to help ensure the patches get backported. Cheers, Joel > > The described way might raise the next exception: > ``` > [ 1.360110] irq 35: nobody cared (try booting with the "irqpoll" option) > [ 1.360145] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.43-c109de3-24cc5b6 #1 > [ 1.360158] Hardware name: Generic DT based system > [ 1.360168] Backtrace: > [ 1.360228] [<80107f5c>] (dump_backtrace) from [<80108184>] (show_stack+0x20/0x24) > [ 1.360250] r7:00000023 r6:00000000 r5:00000000 r4:9d12d560 > [ 1.360283] [<80108164>] (show_stack) from [<8084ae54>] (dump_stack+0x20/0x28) > [ 1.360316] [<8084ae34>] (dump_stack) from [<80156790>] (__report_bad_irq+0x40/0xc0) > [ 1.360344] [<80156750>] (__report_bad_irq) from [<801566c0>] (note_interrupt+0x238/0x290) > [ 1.360366] r9:9d0ae000 r8:9d00c600 r7:00000023 r6:00000000 r5:00000000 r4:9d12d560 > [ 1.360408] [<80156488>] (note_interrupt) from [<80153594>] (handle_irq_event+0xb4/0xc4) > [ 1.360429] r10:00000000 r9:9d0ae000 r8:9d00c600 r7:00000001 r6:00000000 r5:00000000 > [ 1.360440] r4:9d12d560 r3:00000000 > [ 1.360466] [<801534e0>] (handle_irq_event) from [<8015788c>] (handle_level_irq+0xac/0x180) > [ 1.360480] r5:80c7d35c r4:9d12d560 > [ 1.360503] [<801577e0>] (handle_level_irq) from [<80152a5c>] (__handle_domain_irq+0x6c/0xc8) > [ 1.360519] r5:80c7d35c r4:9d12d560 > [ 1.360545] [<801529f0>] (__handle_domain_irq) from [<801021cc>] (avic_handle_irq+0x68/0x70) > [ 1.360568] r9:9d0ae000 r8:9d12d608 r7:9d0afc84 r6:ffffffff r5:9d0afc50 r4:9d002380 > [ 1.360587] [<80102164>] (avic_handle_irq) from [<80101a6c>] (__irq_svc+0x6c/0x90) > [ 1.360603] Exception stack(0x9d0afc50 to 0x9d0afc98) > [ 1.360620] fc40: 00000000 00000100 00000000 00000000 > [ 1.360640] fc60: 9d12d560 98bbd0c0 00000000 00000023 9d12d608 60000053 00000000 9d0afcd4 > [ 1.360657] fc80: 9d0afc80 9d0afca0 801570ec 80154cdc 40000053 ffffffff > [ 1.360670] r5:40000053 r4:80154cdc > [ 1.360693] [<801549e0>] (__setup_irq) from [<801555e4>] (request_threaded_irq+0xdc/0x15c) > [ 1.360715] r9:98bbb340 r8:00000023 r7:9d12d570 r6:9d12d560 r5:00000000 r4:98bbd0c0 > [ 1.360741] [<80155508>] (request_threaded_irq) from [<801589d8>] (devm_request_threaded_irq+0x70/0xc4) > [ 1.360762] r10:80a7353c r9:00000000 r8:98bbb340 r7:9d130e10 r6:00000023 r5:804f4a70 > [ 1.360774] r4:98bbd020 r3:00000080 > [ 1.360800] [<80158968>] (devm_request_threaded_irq) from [<804f4ebc>] (aspeed_lpc_snoop_probe+0x100/0x2ac) > [ 1.360821] r10:00000000 r9:9d130e10 r8:98bbd040 r7:00000000 r6:9d130e00 r5:98bbb340 > [ 1.360830] r4:00000000 > [ 1.360851] [<804f4dbc>] (aspeed_lpc_snoop_probe) from [<8056a5c4>] (platform_drv_probe+0x44/0x80) > [ 1.360873] r9:80c5ef90 r8:00000000 r7:80cc2938 r6:00000000 r5:80c5ef90 r4:9d130e10 > [ 1.360910] [<8056a580>] (platform_drv_probe) from [<80568420>] (really_probe+0x26c/0x498) > [ 1.360924] r5:80cc282c r4:9d130e10 > [ 1.360949] [<805681b4>] (really_probe) from [<80568c28>] (driver_probe_device+0x138/0x184) > [ 1.360970] r10:80b0050c r9:80adadb0 r8:00000007 r7:80c5ef90 r6:9d130e10 r5:00000000 > [ 1.360981] r4:80c5ef90 > [ 1.361004] [<80568af0>] (driver_probe_device) from [<80568fe4>] (device_driver_attach+0xb8/0xc0) > [ 1.361020] r7:80c5ef90 r6:9d130e54 r5:00000000 r4:9d130e10 > [ 1.361046] [<80568f2c>] (device_driver_attach) from [<80569070>] (__driver_attach+0x84/0x16c) > [ 1.361063] r7:80c61128 r6:9d130e10 r5:00000001 r4:80c5ef90 > [ 1.361088] [<80568fec>] (__driver_attach) from [<80566068>] (bus_for_each_dev+0x84/0xcc) > [ 1.361106] r7:80c61128 r6:80568fec r5:80c5ef90 r4:00000000 > [ 1.361130] [<80565fe4>] (bus_for_each_dev) from [<80569180>] (driver_attach+0x28/0x30) > [ 1.361147] r6:00000000 r5:9d1a3d40 r4:80c5ef90 > [ 1.361169] [<80569158>] (driver_attach) from [<80566a08>] (bus_add_driver+0x114/0x200) > [ 1.361195] [<805668f4>] (bus_add_driver) from [<80569814>] (driver_register+0x98/0x128) > [ 1.361214] r7:00000000 r6:80ca0ca0 r5:00000000 r4:80c5ef90 > [ 1.361241] [<8056977c>] (driver_register) from [<8056b528>] (__platform_driver_register+0x40/0x54) > [ 1.361256] r5:000000b8 r4:80b2575c > [ 1.361294] [<8056b4e8>] (__platform_driver_register) from [<80b2577c>] (aspeed_lpc_snoop_driver_init+0x20/0x28) > [ 1.361331] [<80b2575c>] (aspeed_lpc_snoop_driver_init) from [<80b01318>] (do_one_initcall+0x84/0x184) > [ 1.361356] [<80b01294>] (do_one_initcall) from [<80b01540>] (kernel_init_freeable+0x128/0x1ec) > [ 1.361375] r7:80b3f858 r6:80ca0ca0 r5:000000b8 r4:80b61914 > [ 1.361412] [<80b01418>] (kernel_init_freeable) from [<80864060>] (kernel_init+0x18/0x11c) > [ 1.361435] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80864048 > [ 1.361444] r4:00000000 > [ 1.361470] [<80864048>] (kernel_init) from [<801010e8>] (ret_from_fork+0x14/0x2c) > [ 1.361483] Exception stack(0x9d0affb0 to 0x9d0afff8) > [ 1.361500] ffa0: 00000000 00000000 00000000 00000000 > [ 1.361518] ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > [ 1.361535] ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 > [ 1.361547] r5:80864048 r4:00000000 > [ 1.361555] handlers: > [ 1.361592] [<(ptrval)>] aspeed_lpc_snoop_irq > [ 1.361609] Disabling IRQ #35 > > ``` > > Main caught of that state is the lpc-snoop driver found on the same > 1e789080 address and have same IRQ#35 as for lpc-kcs, and lpc-snoop > registering earlier than lpc-kcs. So, on the lpc-snoop initialization > the lpc-snoop IRQ will be registried for IRQ#35, but it will > passthrough it for the LPC KCS handlers that is not registried yet. > > Summary we got the `nobody cared` warning about more 100.000 unhandled > IRQ#35 > > Steps to reproduce: > * Turn-on BMC > * Turn-on HOST > * Run `watch 'ipmitool sensor'` on the host that is configured to pass > requests via kcs-channel(3,4) > * Reboot BMC. > * On the next BMC boot kernel(BMC) dmesg have exception mentioned above. > > The following patchset aims to fixup described issue. > > Igor Kononenko (3): > ipmi:kcs_bmc: Add cleanup regmap(interrupt-regs) on a shutdown. > drivers/misc: (aspeed-lpc-snoop): Add regmap cleanup on a shutdown. > drivers/misc: (aspeed-lpc-snoop): Fix platform_get_irq() error > checking > > drivers/char/ipmi/kcs_bmc_aspeed.c | 8 +++++ > drivers/soc/aspeed/aspeed-lpc-snoop.c | 46 ++++++++++++++++++++++++++- > 2 files changed, 53 insertions(+), 1 deletion(-) > > -- > 2.25.1 >