[{"id":3681313,"web_url":"http://patchwork.ozlabs.org/comment/3681313/","msgid":"<3570e178-f887-45c9-a251-e089915cfbd9@linux.intel.com>","list_archive_url":null,"date":"2026-04-23T07:55:02","subject":"Re: [PATCH v3 06/11] iommu: Defer __iommu_group_free_device() to be\n outside group->mutex","submitter":{"id":73538,"url":"http://patchwork.ozlabs.org/api/people/73538/","name":"Baolu Lu","email":"baolu.lu@linux.intel.com"},"content":"On 4/17/26 07:28, Nicolin Chen wrote:\n> __iommu_group_remove_device() holds group->mutex across the entire call to\n> __iommu_group_free_device() that performs sysfs removals, tracing, and the\n> final kfree_rcu(). But in fact, most of these operations don't really need\n> the group->mutex.\n> \n> The group_device structure will support a work_struct to quarantine broken\n> devices asynchronously. The work function must hold group->mutex to safely\n> update group state. cancel_work_sync() must be called, to cancel that work\n> before freeing the device. But doing so under group->mutex would deadlock\n> if the worker is already running and waiting to acquire the same lock.\n> \n> Separate the assertion from __iommu_group_free_device() to another helper\n> __iommu_group_empty_assert_owner_cnt().\n> \n> Defer the __iommu_group_free_device() until the mutex is released.\n> \n> This is a preparatory refactor with no functional change.\n> \n> Signed-off-by: Nicolin Chen\n> ---\n> drivers/iommu/iommu.c | 35 +++++++++++++++++++++++------------\n> 1 file changed, 23 insertions(+), 12 deletions(-)\n> \n> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c\n> index d1be62a07904a..810e7b94a1ae2 100644\n> --- a/drivers/iommu/iommu.c\n> +++ b/drivers/iommu/iommu.c\n> @@ -627,6 +627,19 @@ static struct iommu_domain *pasid_array_entry_to_domain(void *entry)\n> \n> DEFINE_MUTEX(iommu_probe_device_lock);\n> \n> +static void __iommu_group_empty_assert_owner_cnt(struct iommu_group *group)\n> +{\n> +\tlockdep_assert_held(&group->mutex);\n> +\t/*\n> +\t * If the group has become empty then ownership must have been\n> +\t * released, and the current domain must be set back to NULL or\n> +\t * the default domain.\n> +\t */\n\nNit: this comment doesn't quite match the following code. The code\ndoesn't check \"group->domain != NULL\". Or perhaps in that case,\ngroup->default_domain must be NULL?\n\nFurthermore, if a device is currently quarantined, group->domain will be\nthe blocking_domain. If that quarantined device is then hot-removed and\nhappens to be the last device in the group, will this WARN_ON trigger\nunnecessarily?\n\n> +\tif (list_empty(&group->devices))\n> +\t\tWARN_ON(group->owner_cnt ||\n> +\t\t\tgroup->domain != group->default_domain);\n> +}\n> +\n> static int __iommu_probe_device(struct device *dev, struct list_head *group_list)\n> {\n> \tstruct iommu_group *group;\n\nThanks,\nbaolu","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=KNFyRdVp;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-pci+bounces-53036-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com\n header.b=\"KNFyRdVp\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=198.175.65.13","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=linux.intel.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=linux.intel.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1T360L7Wz1yCv\n\tfor ; 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Wysocki\" , Len Brown ,\n Pranjal Shrivastava , Mostafa Saleh ,\n Kevin Tian , linux-arm-kernel@lists.infradead.org,\n iommu@lists.linux.dev, linux-kernel@vger.kernel.org,\n linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, vsethi@nvidia.com,\n Shuai Xue ","References":"\n <3f5d229267d1f4d918641bc5b896f54b5c4b7782.1776381841.git.nicolinc@nvidia.com>","Content-Language":"en-US","From":"Baolu Lu ","In-Reply-To":"\n <3f5d229267d1f4d918641bc5b896f54b5c4b7782.1776381841.git.nicolinc@nvidia.com>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit"}},{"id":3681543,"web_url":"http://patchwork.ozlabs.org/comment/3681543/","msgid":"","list_archive_url":null,"date":"2026-04-23T15:47:16","subject":"Re: [PATCH v3 06/11] iommu: Defer __iommu_group_free_device() to be\n outside group->mutex","submitter":{"id":82183,"url":"http://patchwork.ozlabs.org/api/people/82183/","name":"Nicolin Chen","email":"nicolinc@nvidia.com"},"content":"On Thu, Apr 23, 2026 at 03:55:02PM +0800, Baolu Lu wrote:\n> On 4/17/26 07:28, Nicolin Chen wrote:\n> > +static void __iommu_group_empty_assert_owner_cnt(struct iommu_group *group)\n> > +{\n> > +\tlockdep_assert_held(&group->mutex);\n> > +\t/*\n> > +\t * If the group has become empty then ownership must have been\n> > +\t * released, and the current domain must be set back to NULL or\n> > +\t * the default domain.\n> > +\t */\n> \n> Nit: this comment doesn't quite match the following code. The code\n> doesn't check \"group->domain != NULL\". Or perhaps in that case,\n> group->default_domain must be NULL?\n\nThis is the original patch from Jason:\nhttps://lore.kernel.org/r/4-v3-328044aa278c+45e49-iommu_probe_jgg@nvidia.com\n\nI kept the comments as-is, though It might be slightly confusing?\n\nI think it means:\nIf group->default_domain == NULL, it does check \"set back to NULL\".\nIf group->default_domain != NULL, it then checks \"default domain\".\n\nMaybe it could be \"must be set back to the default domain (which\nitself can be NULL\"?\n\n> Furthermore, if a device is currently quarantined, group->domain will be\n> the blocking_domain. If that quarantined device is then hot-removed and\n> happens to be the last device in the group, will this WARN_ON trigger\n> unnecessarily?\n\nIf a device is quarantined, its group->domain is retained to the\npreviously attached domain. Its blocking state is logged in the\ngdev->blocked flag. So, I think it can pass the test.\n\nThanks\nNicolin","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=poqKwhmE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-pci+bounces-53050-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com\n header.b=\"poqKwhmE\"","smtp.subspace.kernel.org;\n arc=fail smtp.client-ip=52.101.48.12","smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=nvidia.com","smtp.subspace.kernel.org;\n spf=fail smtp.mailfrom=nvidia.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1gTp2NKqz1yD5\n\tfor ; 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