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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B4BBC6FD1D for ; Tue, 28 Mar 2023 02:24:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230344AbjC1CYR (ORCPT ); Mon, 27 Mar 2023 22:24:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229610AbjC1CYQ (ORCPT ); Mon, 27 Mar 2023 22:24:16 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F01EEE1 for ; Mon, 27 Mar 2023 19:24:15 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id f66-20020a255145000000b00b714602d43fso10751408ybb.10 for ; Mon, 27 Mar 2023 19:24:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679970255; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IIWk8E2FhD0ZC/ZMkyMUSyLH1n6qTXVTC28fBAMF0u4=; b=eSI0jSMtM8TCN3DIt0ALDF8asOGVoGQPxFSek4Og40V4GHTgb7VX0uVSFnjiDOcbxo EQ3YxSPgX5jfI/ZQvGom56MhyFLfgFUBZqwmx8himK0CTXSRg6UdvjMCyTUQWYOaksZE fDBQzfJiMuLM4b/9ll9TI9ZUrkGPERrDXmnvtsH1PSk3kAWp4zAb5+s3EDOujPm+XHOz ez2ZBUOHwemE68BkBAy+S4R1NRz/YNW2LraknIbs6ZrAcZTGI4Wx7n9kZMcwd2frIrFg VTGvQCA4KhdFehoRP7IDJDyjak4oEB5m4es16rsqwoQc4HlhGIVNHMRdkI5K3KsSdbfp V6tQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679970255; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IIWk8E2FhD0ZC/ZMkyMUSyLH1n6qTXVTC28fBAMF0u4=; b=K+pfLvnVT8y9A/JcK9rfLEaAKdnQwnQbNXCZlGjovc8brl9T7aC5AKrN/dL6FCW7og EOfSl6SevrAK8+oAm3sb4cBxEgu/VdwaYT2hjwdER6K1Hvlggu2MdmX5C01tHISXcZBU ykPGwHqjTOADH2keX9Zeqxtruf5wXIXrt3JGCpYmrLMiewlpFQDZaBcQaiq0rcvJjT6c 7Onyzc6dF2KjgpUvvGe6h0Dp11MhccC87XxkA69mZAkNpxxg0anMH0ocvNWZNCNtoD/y yAVakR3nzc+nOfrYI216X1oHgjUFSbmdMkqTgNumr51bvYom9eJ+OhVBFz2hZwK0iKMu Ae7A== X-Gm-Message-State: AAQBX9c7lZeJ0C83t0utm4xShXkTqxUljUn+TSU0X4z2sgjA2f0mv0ck sDIojHBdYS5XYbfRCxQ1bdIdfSW2dZk= X-Google-Smtp-Source: AKy350Yc9gNnjUwkT1L/Czn4VDNPMMf9w37THZNTzarP3ln1ljYD3oSIACFpDcm6vwQtbisDUVLH1n76PiQ= X-Received: from pandoh.svl.corp.google.com ([2620:15c:2c5:11:7ff3:b6c5:b0f1:63e8]) (user=pandoh job=sendgmr) by 2002:a05:6902:18c7:b0:b72:fff0:2f7f with SMTP id ck7-20020a05690218c700b00b72fff02f7fmr11533578ybb.4.1679970255089; Mon, 27 Mar 2023 19:24:15 -0700 (PDT) Date: Mon, 27 Mar 2023 19:23:57 -0700 In-Reply-To: <20230327094047.47215-17-yi.l.liu@intel.com> Mime-Version: 1.0 References: <20230327094047.47215-17-yi.l.liu@intel.com> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230328022357.2268961-1-pandoh@google.com> Subject: Re: [PATCH v8 16/24] iommufd/device: Add iommufd_access_detach() API From: Jon Pan-Doh To: yi.l.liu@intel.com Cc: alex.williamson@redhat.com, chao.p.peng@linux.intel.com, cohuck@redhat.com, eric.auger@redhat.com, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, jasowang@redhat.com, jgg@nvidia.com, joro@8bytes.org, kevin.tian@intel.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, lulu@redhat.com, mjrosato@linux.ibm.com, nicolinc@nvidia.com, peterx@redhat.com, robin.murphy@arm.com, shameerali.kolothum.thodi@huawei.com, suravee.suthikulpanit@amd.com, terrence.xu@intel.com, xudong.hao@intel.com, yan.y.zhao@intel.com, yanting.jiang@intel.com, yi.y.sun@linux.intel.com, Jon Pan-Doh Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On 2023/3/27 02:40, Yi Liu wrote: > diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h > index 2e6e8e217cce..ec2ce3ef187d 100644 > --- a/drivers/iommu/iommufd/iommufd_private.h > +++ b/drivers/iommu/iommufd/iommufd_private.h > @@ -263,6 +263,8 @@ struct iommufd_access { > struct iommufd_object obj; > struct iommufd_ctx *ictx; > struct iommufd_ioas *ioas; > + struct iommufd_ioas *ioas_unpin; > + struct mutex ioas_lock; > const struct iommufd_access_ops *ops; > void *data; > unsigned long iova_alignment; I think you may need to initialize ioas_lock. I got lockdep warnings running iommufd selftests against this patch. Those went away when I added mutex_init(). --- drivers/iommu/iommufd/device.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index f0522d80919d..0eaae60f3537 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -474,6 +474,7 @@ iommufd_access_create(struct iommufd_ctx *ictx, iommufd_ctx_get(ictx); iommufd_object_finalize(ictx, &access->obj); *id = access->obj.id; + mutex_init(&access->ioas_lock); return access; } EXPORT_SYMBOL_NS_GPL(iommufd_access_create, IOMMUFD); -- 2.40.0.348.gf938b09366-goog