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=-10.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 D0940C433E0 for ; Tue, 4 Aug 2020 09:40:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA0442086A for ; Tue, 4 Aug 2020 09:40:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729004AbgHDJkh (ORCPT ); Tue, 4 Aug 2020 05:40:37 -0400 Received: from comms.puri.sm ([159.203.221.185]:42544 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725832AbgHDJkg (ORCPT ); Tue, 4 Aug 2020 05:40:36 -0400 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id 71AABE01A6; Tue, 4 Aug 2020 02:40:05 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IZ3dMqPPU68j; Tue, 4 Aug 2020 02:40:04 -0700 (PDT) Subject: Re: [PATCH] scsi: sd: add runtime pm to open / release To: Alan Stern Cc: James Bottomley , Bart Van Assche , Can Guo , martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@puri.sm References: <20200729143213.GC1530967@rowland.harvard.edu> <1596033995.4356.15.camel@linux.ibm.com> <1596034432.4356.19.camel@HansenPartnership.com> <1596037482.4356.37.camel@HansenPartnership.com> <20200729182515.GB1580638@rowland.harvard.edu> <1596047349.4356.84.camel@HansenPartnership.com> <20200730151030.GB6332@rowland.harvard.edu> From: Martin Kepplinger Autocrypt: addr=martin.kepplinger@puri.sm; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO dnJTKZpBAKd1J7S2Ib3dRwvALdiD7zqMGqkw5xrtwasatS7pc6o/BFgA9GxbeIzKmvW/hc3Q amS/sB12BojyzdUJ3TnIoAqvwKTGcv5VYo2Z+3FV+/MJVXPo8cj2vmfxQx1WG4n6X0pK4X8A BkCKw2N/evMZblNqAzzGVtoJvqQYkzQ20Fm+d3wFl6lS1db4MB+kU13G8kEIE22Q3i6kx4NA N49FLlPeDabGfJUyDaZp5pmKdcd7/FIGH/HjShjx7g+LKSwWNMkDygr4WARAP4h8zYDZuNqe ofPvMLqJxHeexBPIGF/+OwMyTvM7otP5ODuFmq6OqjNPf1irJmkiFv3yEa+Ip0vZzwl4XvrZ U0IKjSy2rbRLg22NsJT0XVZJbutIXYSvIHGqSxzzfiOOLnRjR++fbeEoVlRJ4NZHDKCh3pJv LNd+j03jXr4Rm058YLgO7164yr7FhMZniBJw6z648rk8/8gGPQARAQABtC1NYXJ0aW4gS2Vw cGxpbmdlciA8bWFydGluLmtlcHBsaW5nZXJAcHVyaS5zbT6JAk4EEwEIADgWIQTyCCuID55C OTRobj9QA5jfWrOH0wUCXPSlkwIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAAKCRBQA5jf WrOH06/FEACC/GTz88DOdWR5JgghjtOhaW+EfpFMquJaZwhsaVips7ttkTKbf95rzunhkf2e 8YSalWfmyDzZlf/LKUTcmJZHeU7GAj/hBmxeKxo8yPWIQRQE74OEx5MrwPzL6X7LKzWYt4PT 66bCD7896lhmsMP/Fih2SLKUtL0q41J2Ju/gFwQ6s7klxqZkgTJChKp4GfQrBSChVyYxSyYG UtjS4fTFQYfDKTqwXIZQgIt9tHz4gthJk4a6ZX/b68mRd11GAmFln8yA1WLYCQCYw+wsvCZ0 Ua7gr6YANkMY91JChnezfHW/u/xZ1cCjNP2wpTf4eTMsV1kxW6lkoJRQv643PqzRR2rJPEaS biyg7AFZWza/z7rMB5m7r3wN7BKKAj7Lvt+xoLcncx4jLjgSlROtyRTrctBFXT7cIhcGWHw+ Ib42JF0u96OlPYhRsaIVS3KaD40jMrXf6IEsQw3g6DnuRb2t5p61OX/d9AIcExyYwbdStENN gW9RurhmvW3z9gxvFEByjRE+uVoVuVPsZXwAZqFMi/iK4zRfnjdINYMcxKpjhj8vUdBDtZH3 IpgcI8NemE3B3w/7d3aPjIBz3Igo5SJ3x9XX4hfiWXMU3cT7b5kPcqEN0uAW5RmTA/REC956 rzZYU7WnSgkM8E8xetz5YuqpNeAmi4aeTPiKDo6By8vfJbkCDQRVC32QARAAxTazPZ9jfp6u C+BSiItjwkrFllNEVKptum98JJovWp1kibM+phl6iVo+wKFesNsm568viM2CAzezVlMr7F0u 6NQNK6pu084W9yHSUKROFFr83Uin6t04U88tcCiBYLQ5G+TrVuGX/5qY1erVWI4ycdkqQzb8 APbMFrW/sRb781f8wGXWhDs6Bd4PNYKHv7C0r8XYo77PeSqGSV/55lpSsmoE2+zR3MW5TVoa E83ZxhfqgtTIWMf88mg/20EIhYCRG0iOmjXytWf++xLm9xpMeKnKfWXQxRbfvKg3+KzF30A0 hO3YByKENYnwtSBz8od32N7onG5++azxfuhYZG5MkaNeJPLKPQpyGMc2Ponp0BhCZTvxIbI8 1ZeX6TC+OZbeW+03iGnC7Eo4yJ93QUkzWFOhGGEx0FHj+qBkDQLsREEYwsdxqqr9k1KUD1GF VDl0gzuKqiV4YjlJiFfHh9fbTDztr3Nl/raWNNxA3MtX9nstOr7b+PoA4gH1GXL9YSlXdfBP VnrhgpuuJYcqLy02i3/90Ukii990nmi5CzzhBVFwNjsZTXw7NRStIrPtKCa+eWRCOzfaOqBU KfmzXEHgMl4esqkyFu2MSvbR6clIVajkBmc4+dEgv13RJ9VWW6qNdQw7qTbDJafgQUbmOUMI ygDRjCAL2st/LiAi2MWgl80AEQEAAYkCHwQYAQIACQUCVQt9kAIbDAAKCRBQA5jfWrOH0wSZ EACpfQPYFL4Ii4IpSujqEfb1/nL+Mi+3NLrm8Hp3i/mVgMrUwBd4x0+nDxc7+Kw/IiXNcoQB Q3NC1vsssJ6D+06JOnGJWB9QwoyELGdQ7tSWna405rwDxcsynNnXDT0d39QwFN2nXCyys+7+ Pri5gTyOByJ+E52F27bX29L05iVSRREVe1zLLjYkFQ4LDNStUp/camD6FOfb+9uVczsMoTZ1 do2QtjJMlRlhShGz3GYUw52haWKfN3tsvrIHjZf2F5AYy5zOEgrf8O3jm2LDNidin830+UHb aoJVibCTJvdbVqp/BlA1IKp1s/Y88ylSgxDFwFuXUElJA9GlmNHAzZBarPEJVkYBTHpRtIKp wqmUTH/yH0pzdt8hitI+RBDYynYn0nUxiLZUPAeM5wRLt1XaQ2QDc0QJR8VwBCVSe8+35gEP dO/QmrleN5iA3qOHMW8XwXJokd7MaS6FJKGdFjjZPDMR4Qi8PTn2Lm1NkDHpEtaEjjKmdrt/ 4OpE6fV4iKtC1kcvOtvqxNXzmFn9yabHVlbMwTY2TxF8ImfZvr/1Sdzbs6yziasNRfxTGmmY G2rmB/XO6AMdal5ewWDFfVmIiRoiVdMSuVM6QxrDnyCfP7W8D0rOqTWQwCWrWv///vz8vfTb WlN21GIcpbgBmf9lB8oBpLsmZyXNplhQVmFlorkCDQRc9Ka1ARAA1/asLtvTrK+nr7e93ZVN xLIfNO4L70TlBQEjUdnaOetBWQoZNH1/vaq84It4ZNGnd0PQ4zCkW+Z90tMftZIlbL2NAuT1 iQ6INnmgnOpfNgEag2/Mb41a57hfP9TupWL5d2zOtCdfTLTEVwnkvDEx5TVhujxbdrEWLWfx 0DmrI+jLbdtCene7kDV+6IYKDMdXKVyTzHGmtpn5jZnXqWN4FOEdjQ0IPHOlc1BT0lpMgmT6 cSMms5pH3ZYf9tHG94XxKSpRpeemTTNfMUkFItU6+gbw9GIox6Vqbv6ZEv0PAhbKPoEjrbrp FZw9k0yUepX0e8nr0eD4keQyC6WDWWdDKVyFFohlcBiFRb6BchJKm/+3EKZu4+L1IEtUMEtJ Agn1eiA42BODp2OG4FBT/wtHE7CYhHxzyKk/lxxXy2QWGXtCBIK3LPPclMDgYh0x0bosY7bu 3tX4jiSs0T95IL3Yl4weMClAxQRQYt45EiESWeOBnl8AHV8YDwy+O7uIT2OHpxvdY7YK1gHN i5E3yaI0XCXXtyw82LIAOxcCUuMkuNMsBOtBM3gHDourxrNnYxZEDP6UcoJn3fTyevRBqMRa QwUSHuo0x6yvjzY2HhOHzrg3Qh7XLn8mxIr/z82kn++cD/q3ewEe6uAXkt7I12MR0jbihGwb 8KZWlwK9rYAtfCMAEQEAAYkEcgQYAQgAJhYhBPIIK4gPnkI5NGhuP1ADmN9as4fTBQJc9Ka1 AhsCBQkDwmcAAkAJEFADmN9as4fTwXQgBBkBCAAdFiEER3IIz/s0aDIAhj4GfiztzT9UrIUF Alz0prUACgkQfiztzT9UrIUfiBAAt3N8bUUH2ZQahtVO2CuEiHyc3H0f8BmEVGzvnDcmoJEf H6uS/0kF0Y05aX+U6oYg/E9VWztA6E6guC7Bz9zr6fYZaLnDefzkuDRQAzZzBNpxcUrJheOk YDAa/8fORIQXJO12DSOq4g9X2RSqIcmQgx2/KoW4UG3e4OArqgMS7ESDT6uT1WFcscfqjPJX jXKIH3tg/aJ7ZDkGMFanYsDaiII1ZKpor9WZAsfImPi0n2UZSNEZZtXoR6rtp4UT+O3QrMrn MZQlOBkv2HDq1Fe1PXMiFst5kAUcghIebyHdRhQABI7rLFeUqHoEVGuAyuayTsVNecMse7pF O44otpwFZe+5eDTsEihY1LeWuXIkjBgo0kmNTZOTwjNeL2aDdpZzN70H4Ctv6+r24248RFMi y1YUosIG/Un6OKY4hVShLuXOqsUL41j4UJKRClHEWEIFFUhUgej3Ps1pUxLVOI+ukhAUJwWw BagsKq/Gb8T/AhH3noosCHBXeP5ZyT5vMmHk2ZvwwWQnUJVHBAv2e9pXoOWMepyaTs/N9u4u 3HG3/rYSnYFjgl4wzPZ73QUvCxEYfJi9V4Yzln+F9hK6hKj3bKHAQivx+E3NvFuIIM1adiRh hQClh2MaZVy94xU6Sftl9co3BsilV3H7wrWd5/vufZlZDtHmPodae7v5AFmavrIXFxAAsm4Z OwwzhG6iz+9mGakJBWjXEKxnAotuI2FCLWZV/Zs8tfhkbeqYFO8Vlz3o0sj+r63sWFkVTXOb X7jCQUwW7HXEdMaCaDfC6NUkkKT1PJIBC+kpcVPSq4v/Nsn+yg+K+OGUbHjemhjvS77ByZrN /IBZOm94DSYgZQJRTmTVYd96G++2dMPOaUtWjqmCzu3xOfpluL1dR19qCZjD1+mAx5elqLi7 BrZgJOUjmUb/XI/rDLBpoFQ/6xNJuDA4UTi1d+eEZecOEu7mY1xBQkvKNXL6esqx7ldieaLN Af4wUksA+TEUl2XPu84pjLMUbm0FA+sUnGvMkhCn8YdQtEbcgNYq4eIlOjHW+h7zU2G5/pm+ FmxNAJx7iiXaUY9KQ3snoEz3r37RxEDcvTY9KKahwxEzk2Mf58OPVaV4PEsRianrmErSUfmp l93agbtZK1r5LaxeItFOj+O2hWFLNDenJRlBYwXwlJCiHxM/O273hZZPoP8L5p54uXhaS5EJ uV2Xzgbi3VEbw3GZr+EnDC7XNE2wUrnlD/w2W6RzVYjVT6IX4SamNlV+MWX0/1fYCutfqZl8 6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO ekMtxgNYb/8oDry09UFHbGHLsWn6oBo= Message-ID: <9b80ca7c-39f8-e52d-2535-8b0baf93c7d1@puri.sm> Date: Tue, 4 Aug 2020 11:39:59 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 In-Reply-To: <20200730151030.GB6332@rowland.harvard.edu> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30.07.20 17:10, Alan Stern wrote: > On Thu, Jul 30, 2020 at 10:52:14AM +0200, Martin Kepplinger wrote: >> Maybe I should just start a new discussion with a patch, but the below >> is what makes sense to me (when I understand you correctly) and seems to >> work. I basically add a new flag, so that the old flags behave unchanged >> and only call it during *runtime* resume for SD cards: >> >> >> --- a/drivers/scsi/scsi_error.c >> +++ b/drivers/scsi/scsi_error.c >> @@ -553,15 +553,21 @@ int scsi_check_sense(struct scsi_cmnd *scmd) >> * information that we should pass up to the upper-level >> driver >> * so that we can deal with it there. >> */ >> - if (scmd->device->expecting_cc_ua) { >> + if (scmd->device->expecting_cc_ua || >> + scmd->device->expecting_media_change) { >> /* >> * Because some device does not queue unit >> * attentions correctly, we carefully check >> * additional sense code and qualifier so as >> - * not to squash media change unit attention. >> + * not to squash media change unit attention; >> + * unless expecting_media_change is set, indicating >> + * that the media (most likely) didn't change >> + * but a device only believes so (for example >> + * because of suspend/resume). >> */ >> - if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { >> - scmd->device->expecting_cc_ua = 0; >> + if ((sshdr.asc != 0x28 || sshdr.ascq != 0x00) || >> + scmd->device->expecting_media_change) { >> + scmd->device->expecting_media_change = 0; >> return NEEDS_RETRY; >> } >> } >> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c >> index d90fefffe31b..b647fab2b663 100644 >> --- a/drivers/scsi/sd.c >> +++ b/drivers/scsi/sd.c >> @@ -114,6 +114,7 @@ static void sd_shutdown(struct device *); >> static int sd_suspend_system(struct device *); >> static int sd_suspend_runtime(struct device *); >> static int sd_resume(struct device *); >> +static int sd_resume_runtime(struct device *); >> static void sd_rescan(struct device *); >> static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt); >> static void sd_uninit_command(struct scsi_cmnd *SCpnt); >> @@ -574,7 +575,7 @@ static const struct dev_pm_ops sd_pm_ops = { >> .poweroff = sd_suspend_system, >> .restore = sd_resume, >> .runtime_suspend = sd_suspend_runtime, >> - .runtime_resume = sd_resume, >> + .runtime_resume = sd_resume_runtime, >> }; >> >> static struct scsi_driver sd_template = { >> @@ -3652,6 +3653,21 @@ static int sd_resume(struct device *dev) >> return ret; >> } >> >> +static int sd_resume_runtime(struct device *dev) >> +{ >> + struct scsi_disk *sdkp = dev_get_drvdata(dev); >> + >> + /* Some SD cardreaders report media change when resuming from >> suspend >> + * because they can't keep track during suspend. */ >> + >> + /* XXX This is not unproblematic though: We won't notice when a card >> + * was really changed during runtime suspend! We basically rely >> on users >> + * to unmount or suspend before doing so. */ >> + sdkp->device->expecting_media_change = 1; >> + >> + return sd_resume(dev); >> +} >> + >> /** >> * init_sd - entry point for this driver (both when built in or when >> * a module). >> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h >> index bc5909033d13..8c8f053f71c8 100644 >> --- a/include/scsi/scsi_device.h >> +++ b/include/scsi/scsi_device.h >> @@ -169,6 +169,8 @@ struct scsi_device { >> * this device */ >> unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN >> * because we did a bus reset. */ >> + unsigned expecting_media_change:1; /* Expecting media change >> ASC/ASCQ >> + when it actually doesn't >> change */ >> unsigned use_10_for_rw:1; /* first try 10-byte read / write */ >> unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ >> unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ > > That's pretty much what James was suggesting, except for one thing: You > must not set sdkp->device->expecting_media_change to 1 for all devices > in sd_runtime_resume(). Only for devices which may generate a spurious > Unit Attention following runtime resume -- and maybe not even for all of > them, depending on what the user wants. > > Alan Stern > when I mount the SD card myself or via Nautilus, things work. When I put sth like: /dev/sda1 /mnt/sda1 auto auto,nofail 0 2 into fstab, I *still* get (constantly) when accessing the files: [ 50.838061] sd 0:0:0:0: [sda] tag#0 device offline or changed why could that be? is there another place we would add such a new flag (not only resume())? martin