From nobody Fri Feb 13 14:10:14 2026 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 900ABCE7A91 for ; Mon, 25 Sep 2023 02:39:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232070AbjIYCj1 (ORCPT ); Sun, 24 Sep 2023 22:39:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54518 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231826AbjIYCjJ (ORCPT ); Sun, 24 Sep 2023 22:39:09 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82236199 for ; Sun, 24 Sep 2023 19:38:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695609523; x=1727145523; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xt59YPV3UPgR9fnqUhyNXSoK4BasWhrnYxVljgS7h3Q=; b=CF1/eQbVQu0k6YFU1F+EjnxCxf7xew0ntkOSLHtfmMjH9gGjFVa5+ZBV PkhbCQk3NUD9v9WAF38dt/okO2IvCburgorC53JCTB7mtgKVMpxHmjC2v 8NuhNGq9XNErAnQkZBcHPTs3o21fpVS7Fg+nS/F0DUA8YN1jQczdpu/Fa y37XaJL8vsR7aGKL47sEhO9R0/uCyTNw7eZMR+N/b/Mw2RiJFeXirY+6o /cRLyzvhKGRB6yRO0wtrDEFFJG78vUA6k+3Acjz1tQ/ioW+TkCR4KObNO ab2kv6N9y+yugw5mE02d8gJySdPNJGYtQLzcKSmr/HmFfauDQuhrtLHWp Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10843"; a="360534620" X-IronPort-AV: E=Sophos;i="6.03,174,1694761200"; d="scan'208";a="360534620" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2023 19:38:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10843"; a="777505090" X-IronPort-AV: E=Sophos;i="6.03,174,1694761200"; d="scan'208";a="777505090" Received: from jingxues-mobl1.ccr.corp.intel.com (HELO tinazhan-desk1.intel.com) ([10.254.214.78]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2023 19:38:40 -0700 From: Tina Zhang To: Jason Gunthorpe , Kevin Tian , Lu Baolu Cc: Michael Shavit , Vasant Hegde , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Tina Zhang Subject: [PATCH v5 5/6] iommu: Support mm PASID 1:n with sva domains Date: Mon, 25 Sep 2023 10:38:12 +0800 Message-Id: <20230925023813.575016-6-tina.zhang@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230925023813.575016-1-tina.zhang@intel.com> References: <20230925023813.575016-1-tina.zhang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Each mm bound to devices gets a PASID and corresponding sva domains allocated in iommu_sva_bind_device(), which are referenced by iommu_mm field of the mm. The PASID is released in __mmdrop(), while a sva domain is released when no one is using it (the reference count is decremented in iommu_sva_unbind_device()). However, although sva domains and their PASID are separate objects such that their own life cycles could be handled independently, an enqcmd use case may require releasing the PASID in releasing the mm (i.e., once a PASID is allocated for a mm, it will be permanently used by the mm and won't be released until the end of mm) and only allows to drop the PASID after the sva domains are released. To this end, mmgrab() is called in iommu_sva_domain_alloc() to increment the mm reference count and mmdrop() is invoked in iommu_domain_free() to decrement the mm reference count. Since the required info of PASID and sva domains is kept in struct iommu_mm_data of a mm, use mm->iommu_mm field instead of the old pasid field in mm struct. The sva domain list is protected by iommu_sva_lock. Besides, this patch removes mm_pasid_init(), as with the introduced iommu_mm structure, initializing mm pasid in mm_init() is unnecessary. Reviewed-by: Lu Baolu Reviewed-by: Vasant Hegde Signed-off-by: Tina Zhang Reviewed-by: Jason Gunthorpe --- Change in v5: - Use smp_store_release() & READ_ONCE() in storing and loading mm's pasid value. Change in v4: - Rebase to v6.6-rc1. drivers/iommu/iommu-sva.c | 40 +++++++++++++++++++++++++++------------ include/linux/iommu.h | 18 +++++++++++------- kernel/fork.c | 1 - 3 files changed, 39 insertions(+), 20 deletions(-) diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c index 0f956ecd0c9b..b2c1db1ae385 100644 --- a/drivers/iommu/iommu-sva.c +++ b/drivers/iommu/iommu-sva.c @@ -15,6 +15,7 @@ static DEFINE_MUTEX(iommu_sva_lock); static int iommu_sva_alloc_pasid(struct mm_struct *mm, struct device *dev) { ioasid_t pasid; + struct iommu_mm_data *iommu_mm; int ret =3D 0; =20 if (!arch_pgtable_dma_compat(mm)) @@ -28,12 +29,27 @@ static int iommu_sva_alloc_pasid(struct mm_struct *mm, = struct device *dev) goto out; } =20 + iommu_mm =3D kzalloc(sizeof(struct iommu_mm_data), GFP_KERNEL); + if (!iommu_mm) { + ret =3D -ENOMEM; + goto out; + } + pasid =3D iommu_alloc_global_pasid(dev); if (pasid =3D=3D IOMMU_PASID_INVALID) { + kfree(iommu_mm); ret =3D -ENOSPC; goto out; } - mm->pasid =3D pasid; + iommu_mm->pasid =3D pasid; + INIT_LIST_HEAD(&iommu_mm->sva_domains); + /* + * Make sure the write to mm->iommu_mm is not reordered in front of + * initialization to iommu_mm fields. If it does, readers may see a + * valid iommu_mm with uninitialized values. + */ + smp_store_release(&mm->iommu_mm, iommu_mm); + ret =3D 0; out: mutex_unlock(&iommu_sva_lock); @@ -73,16 +89,12 @@ struct iommu_sva *iommu_sva_bind_device(struct device *= dev, struct mm_struct *mm =20 mutex_lock(&iommu_sva_lock); /* Search for an existing domain. */ - domain =3D iommu_get_domain_for_dev_pasid(dev, mm_get_pasid(mm), - IOMMU_DOMAIN_SVA); - if (IS_ERR(domain)) { - ret =3D PTR_ERR(domain); - goto out_unlock; - } - - if (domain) { - domain->users++; - goto out; + list_for_each_entry(domain, &mm->iommu_mm->sva_domains, next) { + ret =3D iommu_attach_device_pasid(domain, dev, mm_get_pasid(mm)); + if (!ret) { + domain->users++; + goto out; + } } =20 /* Allocate a new domain and set it on device pasid. */ @@ -96,6 +108,8 @@ struct iommu_sva *iommu_sva_bind_device(struct device *d= ev, struct mm_struct *mm if (ret) goto out_free_domain; domain->users =3D 1; + list_add(&domain->next, &mm->iommu_mm->sva_domains); + out: mutex_unlock(&iommu_sva_lock); handle->dev =3D dev; @@ -128,8 +142,9 @@ void iommu_sva_unbind_device(struct iommu_sva *handle) struct device *dev =3D handle->dev; =20 mutex_lock(&iommu_sva_lock); + iommu_detach_device_pasid(domain, dev, pasid); if (--domain->users =3D=3D 0) { - iommu_detach_device_pasid(domain, dev, pasid); + list_del(&domain->next); iommu_domain_free(domain); } mutex_unlock(&iommu_sva_lock); @@ -209,4 +224,5 @@ void mm_pasid_drop(struct mm_struct *mm) return; =20 iommu_free_global_pasid(mm_get_pasid(mm)); + kfree(mm->iommu_mm); } diff --git a/include/linux/iommu.h b/include/linux/iommu.h index b9c9f14a95cc..cf8febaa4d80 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -109,6 +109,11 @@ struct iommu_domain { struct { /* IOMMU_DOMAIN_SVA */ struct mm_struct *mm; int users; + /* + * Next iommu_domain in mm->iommu_mm->sva-domains list + * protected by iommu_sva_lock. + */ + struct list_head next; }; }; }; @@ -1186,17 +1191,17 @@ static inline bool tegra_dev_iommu_get_stream_id(st= ruct device *dev, u32 *stream } =20 #ifdef CONFIG_IOMMU_SVA -static inline void mm_pasid_init(struct mm_struct *mm) -{ - mm->pasid =3D IOMMU_PASID_INVALID; -} static inline bool mm_valid_pasid(struct mm_struct *mm) { - return mm->pasid !=3D IOMMU_PASID_INVALID; + return READ_ONCE(mm->iommu_mm); } static inline u32 mm_get_pasid(struct mm_struct *mm) { - return mm->pasid; + struct iommu_mm_data *iommu_mm =3D READ_ONCE(mm->iommu_mm); + + if (!iommu_mm) + return IOMMU_PASID_INVALID; + return iommu_mm->pasid; } static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm) { @@ -1222,7 +1227,6 @@ static inline u32 iommu_sva_get_pasid(struct iommu_sv= a *handle) { return IOMMU_PASID_INVALID; } -static inline void mm_pasid_init(struct mm_struct *mm) {} static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; } static inline u32 mm_get_pasid(struct mm_struct *mm) { diff --git a/kernel/fork.c b/kernel/fork.c index 3b6d20dfb9a8..985403a7a747 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1277,7 +1277,6 @@ static struct mm_struct *mm_init(struct mm_struct *mm= , struct task_struct *p, mm_init_cpumask(mm); mm_init_aio(mm); mm_init_owner(mm, p); - mm_pasid_init(mm); RCU_INIT_POINTER(mm->exe_file, NULL); mmu_notifier_subscriptions_init(mm); init_tlb_flush_pending(mm); --=20 2.34.1