[{"id":1767594,"web_url":"http://patchwork.ozlabs.org/comment/1767594/","msgid":"<20170913162113.49e80b39@roar.ozlabs.ibm.com>","date":"2017-09-13T06:21:13","subject":"Re: [PATCH v2 3/5] powerpc/mce: Hookup derror (load/store) UE errors","submitter":{"id":69518,"url":"http://patchwork.ozlabs.org/api/people/69518/","name":"Nicholas Piggin","email":"npiggin@gmail.com"},"content":"On Wed, 13 Sep 2017 16:10:47 +1000\nBalbir Singh wrote:\n\n> Extract physical_address for UE errors by walking the page\n> tables for the mm and address at the NIP, to extract the\n> instruction. Then use the instruction to find the effective\n> address via analyse_instr().\n> \n> We might have page table walking races, but we expect them to\n> be rare, the physical address extraction is best effort. The idea\n> is to then hook up this infrastructure to memory failure eventually.\n\nThis all looks pretty good to me, you can probably update these\nchangelogs now because you are hooking it into memory failure.\n\nI wonder if it would be worth skipping the instruction analysis and\npage table walk if we've recursed up to the maximum MCE depth, just\nin case we're hitting MCEs in part of that code or data.\n\nThanks,\nNick","headers":{"Return-Path":"","X-Original-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xsWrG1gT9z9s7M\n\tfor ;\n\tWed, 13 Sep 2017 16:25:50 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xsWrF47ZRzDrJm\n\tfor ;\n\tWed, 13 Sep 2017 16:25:49 +1000 (AEST)","from mail-pg0-x242.google.com (mail-pg0-x242.google.com\n\t[IPv6:2607:f8b0:400e:c05::242])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xsWlJ6swQzDrKm\n\tfor ;\n\tWed, 13 Sep 2017 16:21:32 +1000 (AEST)","by mail-pg0-x242.google.com with SMTP id v82so7233807pgb.1\n\tfor ;\n\tTue, 12 Sep 2017 23:21:32 -0700 (PDT)","from roar.ozlabs.ibm.com (203-219-56-202.tpgi.com.au.\n\t[203.219.56.202]) by smtp.gmail.com with ESMTPSA id\n\tm184sm23395605pfc.82.2017.09.12.23.21.27\n\t(version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);\n\tTue, 12 Sep 2017 23:21:29 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"ZWLxRkZe\"; 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x86_64-pc-linux-gnu)","MIME-Version":"1.0","Content-Type":"text/plain; charset=US-ASCII","Content-Transfer-Encoding":"7bit","X-BeenThere":"linuxppc-dev@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Linux on PowerPC Developers Mail List\n\t","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"linuxppc-dev@lists.ozlabs.org, mahesh@linux.vnet.ibm.com","Errors-To":"linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org","Sender":"\"Linuxppc-dev\"\n\t"}},{"id":1767595,"web_url":"http://patchwork.ozlabs.org/comment/1767595/","msgid":"","date":"2017-09-13T06:26:59","subject":"Re: [PATCH v2 3/5] powerpc/mce: Hookup derror (load/store) UE errors","submitter":{"id":9347,"url":"http://patchwork.ozlabs.org/api/people/9347/","name":"Balbir Singh","email":"bsingharora@gmail.com"},"content":"On Wed, Sep 13, 2017 at 4:21 PM, Nicholas Piggin wrote:\n> On Wed, 13 Sep 2017 16:10:47 +1000\n> Balbir Singh wrote:\n>\n>> Extract physical_address for UE errors by walking the page\n>> tables for the mm and address at the NIP, to extract the\n>> instruction. Then use the instruction to find the effective\n>> address via analyse_instr().\n>>\n>> We might have page table walking races, but we expect them to\n>> be rare, the physical address extraction is best effort. The idea\n>> is to then hook up this infrastructure to memory failure eventually.\n>\n> This all looks pretty good to me, you can probably update these\n> changelogs now because you are hooking it into memory failure.\n\nYep, the eventually can probably go, I meant in the next patch.\nThe following patch then hooks this up into memory_failure\n\n>\n> I wonder if it would be worth skipping the instruction analysis and\n> page table walk if we've recursed up to the maximum MCE depth, just\n> in case we're hitting MCEs in part of that code or data.\n\nYep, good idea. Would you be OK if we did this after this small series\ngot merged? Since that would mean that we got a UE error\nwhile processing the our third machine check exception, I think the\nprobability of us running into that is low, but I'd definitely like to do that\nonce these changes are merged.\n\nBalbir Singh.","headers":{"Return-Path":"","X-Original-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xsWvG4dRDz9s7M\n\tfor ;\n\tWed, 13 Sep 2017 16:28:26 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xsWvG3BLNzDr33\n\tfor ;\n\tWed, 13 Sep 2017 16:28:26 +1000 (AEST)","from mail-ua0-x232.google.com (mail-ua0-x232.google.com\n\t[IPv6:2607:f8b0:400c:c08::232])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xsWsf5MFwzDq5k\n\tfor ;\n\tWed, 13 Sep 2017 16:27:02 +1000 (AEST)","by mail-ua0-x232.google.com with SMTP id l24so17731440uaa.5\n\tfor ;\n\tTue, 12 Sep 2017 23:27:02 -0700 (PDT)","by 10.176.75.25 with HTTP; Tue, 12 Sep 2017 23:26:59 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"AaHyrpWL\"; dkim-atps=neutral","lists.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"AaHyrpWL\"; dkim-atps=neutral","ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gmail.com\n\t(client-ip=2607:f8b0:400c:c08::232; helo=mail-ua0-x232.google.com;\n\tenvelope-from=bsingharora@gmail.com; receiver=)","lists.ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"AaHyrpWL\"; dkim-atps=neutral"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;\n\th=mime-version:in-reply-to:references:from:date:message-id:subject:to\n\t:cc; bh=/gDfZQby6dRiLuuGkfmWoi+ek3XYVvUbrJr7VB9t/LU=;\n\tb=AaHyrpWLEQA0ZsVp0IvSebQPWbmJ3xZ2LsGUjMFGM1Pmott4o3dS2gsRdtkqwZZ3Yz\n\tsKYp8audu/QbMPhp3oTuEaEfQBB/fT+SAeG7o7hjds2SdBhNwuMOZM+7NxARYPzHzTby\n\tdAwrYByCcj6T0RdzU1ythkI849zWVQ93kZgivDQyv2aZoWQPYwGQ3yeedfO/8A1on0Ci\n\tXma0sgi31IwOTPscgBLhpiinZ9zgEyEMteObWweFP5uotdPAhdxEqTPXILAGNEyE45CR\n\tQXsarcmlZjKhHH0tRXKjNcWUXIY6ZacmuGxZe/T1uj/FXNSTbNAiLUB5WBaO6iRnVp4F\n\tgTyQ==","X-Google-DKIM-Signature":"v=1; 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charset=\"UTF-8\"","X-BeenThere":"linuxppc-dev@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Linux on PowerPC Developers Mail List\n\t","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"\"open list:LINUX FOR POWERPC \\(32-BIT AND 64-BIT\\)\"\n\t,\n\tMahesh Jagannath Salgaonkar ","Errors-To":"linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org","Sender":"\"Linuxppc-dev\"\n\t"}},{"id":1767687,"web_url":"http://patchwork.ozlabs.org/comment/1767687/","msgid":"<20170913185630.14cb1bd9@roar.ozlabs.ibm.com>","date":"2017-09-13T08:56:30","subject":"Re: [PATCH v2 3/5] powerpc/mce: Hookup derror (load/store) UE errors","submitter":{"id":69518,"url":"http://patchwork.ozlabs.org/api/people/69518/","name":"Nicholas Piggin","email":"npiggin@gmail.com"},"content":"On Wed, 13 Sep 2017 16:26:59 +1000\nBalbir Singh wrote:\n\n> On Wed, Sep 13, 2017 at 4:21 PM, Nicholas Piggin wrote:\n> > On Wed, 13 Sep 2017 16:10:47 +1000\n> > Balbir Singh wrote:\n> > \n> >> Extract physical_address for UE errors by walking the page\n> >> tables for the mm and address at the NIP, to extract the\n> >> instruction. Then use the instruction to find the effective\n> >> address via analyse_instr().\n> >>\n> >> We might have page table walking races, but we expect them to\n> >> be rare, the physical address extraction is best effort. The idea\n> >> is to then hook up this infrastructure to memory failure eventually. \n> >\n> > This all looks pretty good to me, you can probably update these\n> > changelogs now because you are hooking it into memory failure. \n> \n> Yep, the eventually can probably go, I meant in the next patch.\n> The following patch then hooks this up into memory_failure\n> \n> >\n> > I wonder if it would be worth skipping the instruction analysis and\n> > page table walk if we've recursed up to the maximum MCE depth, just\n> > in case we're hitting MCEs in part of that code or data. \n> \n> Yep, good idea. Would you be OK if we did this after this small series\n> got merged?\n\nI don't mind much, but I'd have thought being that it's all new code,\nadding the check would be pretty easy.\n\n if (get_paca()->in_mce == 4) {}\n\n(Probably with the '4' appropriately #defined out of here and the\nexception-64s.S code)\n\n> Since that would mean that we got a UE error\n> while processing the our third machine check exception, I think the\n> probability of us running into that is low, but I'd definitely like to do that\n> once these changes are merged.\n\nIf we're getting UEs in the machine check code or walking kernel\npage tables though, it will just keep recurring. Unlikely yes, but\nit's still a slight regression.\n\nThanks,\nNick","headers":{"Return-Path":"","X-Original-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xsbDY2CXPz9sPk\n\tfor ;\n\tWed, 13 Sep 2017 18:58:37 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xsbDY0VsHzDqjK\n\tfor ;\n\tWed, 13 Sep 2017 18:58:37 +1000 (AEST)","from mail-pf0-x235.google.com (mail-pf0-x235.google.com\n\t[IPv6:2607:f8b0:400e:c00::235])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xsbBN4KzFzDqNh\n\tfor ;\n\tWed, 13 Sep 2017 18:56:44 +1000 (AEST)","by mail-pf0-x235.google.com with SMTP id e199so22541935pfh.3\n\tfor ;\n\tWed, 13 Sep 2017 01:56:43 -0700 (PDT)","from roar.ozlabs.ibm.com (203-219-56-202.tpgi.com.au.\n\t[203.219.56.202]) by smtp.gmail.com with ESMTPSA id\n\t188sm24392872pfe.171.2017.09.13.01.56.39\n\t(version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);\n\tWed, 13 Sep 2017 01:56:41 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"uekJcrvG\"; dkim-atps=neutral","lists.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"uekJcrvG\"; dkim-atps=neutral","ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gmail.com\n\t(client-ip=2607:f8b0:400e:c00::235; helo=mail-pf0-x235.google.com;\n\tenvelope-from=npiggin@gmail.com; receiver=)","lists.ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"uekJcrvG\"; dkim-atps=neutral"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;\n\th=date:from:to:cc:subject:message-id:in-reply-to:references\n\t:organization:mime-version:content-transfer-encoding;\n\tbh=72jr3quv8bFj8ZJ8e6DKr+q1U+d/t7ndp/f+57/p4Fk=;\n\tb=uekJcrvGOeWcMTjoNi9JrGvuJxaae3urtQ7JLObWgS5qdEw0O5UjY3aQLKI0NgKltk\n\tQ4rSEpMYSrtFKF5+JmcqovwB1ph1Yv/j/a9IsY/FEzf6676KvPdwaiYGUXH2CC5ry4Tv\n\thCjScymA72yEJO6/pSsqHXcfJnSwnSzB9pnQen9UASQIYgq19FCTq2fgPtG9BanOcZ8F\n\tvLixTpExEBf3K1QA91fLfEDQZdW91/NVr+XgfsGfLsusl4UujiBlLpKIzjib+HNHGlgC\n\ttBmTsf627PGuMBNaxPgp1Znyq26B6/f5I1HfVdOfTgc7V6RFPc0zOJeDUqGOqvgrECA2\n\tCsgQ==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to\n\t:references:organization:mime-version:content-transfer-encoding;\n\tbh=72jr3quv8bFj8ZJ8e6DKr+q1U+d/t7ndp/f+57/p4Fk=;\n\tb=mmpJa0EDDpPJg0eDF0mt2IVIloZAkvHfmOi+xuWjWW8NSFS2jihqpKxVAvKl6s9Cx0\n\tGTlyiD6QnNF1qk/INLxY0NnJqyCPNUpEnvuGo5yAMGpAUSMaTJVeVXlvFcjGvFe9VAWN\n\tA00m5zRjYvhJfkXE1dMkiFrBk6fcnaapZtjPlWqb3hKmYWcIqT9StMR4H2m9x4daFYMG\n\teW5AVLrHDF1i9iCwBxSGyglweinkp1soqDu4PDp2vUmYQvdOyAbM3oHNJvsxPx1dheSd\n\tyEtFC1fzKdER9zWlj7dEhmemFC0MW56du7JTmeGwFGimCbybW/wKn9efvrBHDFXuvd0P\n\t7FOg==","X-Gm-Message-State":"AHPjjUgLAw0uInR96AEa1lnoKUxpITiwjwTTdrSEBUq4VgZpWBXvYjEy\n\tvl4quYsI2WSNumok","X-Google-Smtp-Source":"ADKCNb54F8wBH1diRpK1dlju1Nqb/UhVBJchxxWbyGyZgUIO4AxqFquRFRLe5oUBFRL27TF11vo7vg==","X-Received":"by 10.84.172.131 with SMTP id n3mr20008102plb.408.1505293002412; \n\tWed, 13 Sep 2017 01:56:42 -0700 (PDT)","Date":"Wed, 13 Sep 2017 18:56:30 +1000","From":"Nicholas Piggin ","To":"Balbir Singh ","Subject":"Re: [PATCH v2 3/5] powerpc/mce: Hookup derror (load/store) UE errors","Message-ID":"<20170913185630.14cb1bd9@roar.ozlabs.ibm.com>","In-Reply-To":"","References":"<20170913061049.13256-1-bsingharora@gmail.com>\n\t<20170913061049.13256-4-bsingharora@gmail.com>\n\t<20170913162113.49e80b39@roar.ozlabs.ibm.com>\n\t","Organization":"IBM","X-Mailer":"Claws Mail 3.15.0-dirty (GTK+ 2.24.31; x86_64-pc-linux-gnu)","MIME-Version":"1.0","Content-Type":"text/plain; charset=US-ASCII","Content-Transfer-Encoding":"7bit","X-BeenThere":"linuxppc-dev@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Linux on PowerPC Developers Mail List\n\t","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"\"open list:LINUX FOR POWERPC \\(32-BIT AND\n\t64-BIT\\)\" ,\n\tMahesh Jagannath Salgaonkar ","Errors-To":"linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org","Sender":"\"Linuxppc-dev\"\n\t"}}]