From nobody Sun Feb 8 16:31:34 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 C28A1EB64D8 for ; Wed, 14 Jun 2023 15:45:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244967AbjFNPp4 (ORCPT ); Wed, 14 Jun 2023 11:45:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244879AbjFNPp2 (ORCPT ); Wed, 14 Jun 2023 11:45:28 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE546273A for ; Wed, 14 Jun 2023 08:45:06 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-568a85f180dso9968977b3.2 for ; Wed, 14 Jun 2023 08:45:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1686757502; x=1689349502; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=rIYz1+kUM82lpQwp18pWI6n2YGQKaG9udPtQlpxJvZA=; b=ITLTLTaLCsc9HGbm9o39sZh1FY+PCkOK3DqheGkhRPBC/5m4sMot8zJeqp6fvfWE1r t3T//BbToTEl9NchoFS4gdxcOle/PsfltFonLoaAgA2DAOWZERwJ7kzdxMSY2fW6ZZ8y pY+tDn0S1BbfL62uKyPVDPJuYg7OXqEm7XeJ9+DUWbpMulT67bfgJEo9dgHiDVDe4FGN rscahF06lVNVc5DgWu9mjCNiD2g7elxaGjWG9gVInQls6qTkbGhdTgpJbQc97OTMvGT9 oNdhtFouxQm4yOzmlFFhwPGSPEOZr2p+ZrgnJzHBF4mAXsbdtpPsvzu8r/CxQgvc5R+4 6r/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686757502; x=1689349502; 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=rIYz1+kUM82lpQwp18pWI6n2YGQKaG9udPtQlpxJvZA=; b=L/v9j2JPBpHPixDE4vZwY47A2QK1HJ2TN9b9cJ/ZN7jqtq87aIl8MOSykUuFxzK9D0 ABIy5VqPp9ZUapYWin9deaxW49xn3s6k586ZmD/Es8FFGTzZlRTO/674UdoPglpwZfwo DQrPUXWLddEmtPEGJP5jJbDLaTwTG/RqAs3ZL4a7mOjbXhZNLBLJCat7Cl4/W9El2QO3 rsP2GlngxVfXcYhG41Qn8Pl6IB4jSq+2cYZVN/xFYU5FL0F9XSi1aZdVowHcCS2VDr6g PsWpbcQtNlbxhKSBr+ptySWDQMUi+nFvpTlmIJaZFRUNzjkwATIbC6DxnsrLL1ashh/O DcmQ== X-Gm-Message-State: AC+VfDyEV667TvHm65rQ4Nv9HmyDA9R6kTH9M+z+jdg8yzBTeJuTTMf7 Q5QV1PDsm988z4kbubYM0fpQzvJwNCB9 X-Google-Smtp-Source: ACHHUZ7a8fpXcjdm9ERgwJcGejxZs5tL9yslpX+iW/oP0DV08UZci/UMc92nS9z9HRLv/d8ZvhGulclwoYLQ X-Received: from mshavit.ntc.corp.google.com ([2401:fa00:95:20c:c6e6:49bf:5c44:5965]) (user=mshavit job=sendgmr) by 2002:a25:ab85:0:b0:ba8:4ba3:5b54 with SMTP id v5-20020a25ab85000000b00ba84ba35b54mr311468ybi.11.1686757502482; Wed, 14 Jun 2023 08:45:02 -0700 (PDT) Date: Wed, 14 Jun 2023 23:42:04 +0800 In-Reply-To: <20230614154304.2860121-1-mshavit@google.com> Mime-Version: 1.0 References: <20230614154304.2860121-1-mshavit@google.com> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog Message-ID: <20230614154304.2860121-13-mshavit@google.com> Subject: [PATCH v3 12/13] iommu/arm-smmu-v3-sva: Remove arm_smmu_bond From: Michael Shavit To: Will Deacon , Robin Murphy , Joerg Roedel Cc: Michael Shavit , jean-philippe@linaro.org, nicolinc@nvidia.com, jgg@nvidia.com, baolu.lu@linux.intel.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There's a 1:1 relationship between arm_smmu_bond and the iommu_domain used in set_dev_pasid/remove_dev_pasid. arm_smmu_bond has become an unnecessary complication. It's more natural to store any needed information at the iommu_domain container level. Signed-off-by: Michael Shavit --- .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 69 +++++++------------ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 - drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 +- 3 files changed, 24 insertions(+), 48 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iomm= u/arm/arm-smmu-v3/arm-smmu-v3-sva.c index 650c9c9ad52f1..b615a85e6a54e 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c @@ -24,14 +24,13 @@ struct arm_smmu_mmu_notifier { =20 #define mn_to_smmu(mn) container_of(mn, struct arm_smmu_mmu_notifier, mn) =20 -struct arm_smmu_bond { - struct mm_struct *mm; +struct arm_smmu_sva_domain { + struct iommu_domain iommu_domain; struct arm_smmu_mmu_notifier *smmu_mn; - struct list_head list; }; =20 -#define sva_to_bond(handle) \ - container_of(handle, struct arm_smmu_bond, sva) +#define to_sva_domain(domain) \ + container_of(domain, struct arm_smmu_sva_domain, iommu_domain) =20 static DEFINE_MUTEX(sva_lock); =20 @@ -363,10 +362,10 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu= _mmu_notifier *smmu_mn) arm_smmu_free_shared_cd(cd); } =20 -static int __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm) +static int __arm_smmu_sva_bind(struct device *dev, + struct arm_smmu_sva_domain *sva_domain, + struct mm_struct *mm) { - int ret; - struct arm_smmu_bond *bond; struct arm_smmu_master *master =3D dev_iommu_priv_get(dev); struct iommu_domain *domain =3D iommu_get_domain_for_dev(dev); struct arm_smmu_domain *smmu_domain =3D to_smmu_domain(domain); @@ -374,24 +373,14 @@ static int __arm_smmu_sva_bind(struct device *dev, st= ruct mm_struct *mm) if (!master || !master->sva_enabled) return -ENODEV; =20 - bond =3D kzalloc(sizeof(*bond), GFP_KERNEL); - if (!bond) - return -ENOMEM; - - bond->mm =3D mm; - - bond->smmu_mn =3D arm_smmu_mmu_notifier_get(smmu_domain, mm); - if (IS_ERR(bond->smmu_mn)) { - ret =3D PTR_ERR(bond->smmu_mn); - goto err_free_bond; + sva_domain->smmu_mn =3D arm_smmu_mmu_notifier_get(smmu_domain, + mm); + if (IS_ERR(sva_domain->smmu_mn)) { + sva_domain->smmu_mn =3D NULL; + return PTR_ERR(sva_domain->smmu_mn); } - - list_add(&bond->list, &master->bonds); + master->nr_attached_sva_domains +=3D 1; return 0; - -err_free_bond: - kfree(bond); - return ret; } =20 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu) @@ -521,7 +510,7 @@ int arm_smmu_master_enable_sva(struct arm_smmu_master *= master) int arm_smmu_master_disable_sva(struct arm_smmu_master *master) { mutex_lock(&sva_lock); - if (!list_empty(&master->bonds)) { + if (master->nr_attached_sva_domains !=3D 0) { dev_err(master->dev, "cannot disable SVA, device is bound\n"); mutex_unlock(&sva_lock); return -EBUSY; @@ -545,23 +534,12 @@ void arm_smmu_sva_notifier_synchronize(void) void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain, struct device *dev, ioasid_t id) { - struct mm_struct *mm =3D domain->mm; - struct arm_smmu_bond *bond =3D NULL, *t; + struct arm_smmu_sva_domain *sva_domain =3D to_sva_domain(domain); struct arm_smmu_master *master =3D dev_iommu_priv_get(dev); =20 mutex_lock(&sva_lock); - list_for_each_entry(t, &master->bonds, list) { - if (t->mm =3D=3D mm) { - bond =3D t; - break; - } - } - - if (!WARN_ON(!bond)) { - list_del(&bond->list); - arm_smmu_mmu_notifier_put(bond->smmu_mn); - kfree(bond); - } + master->nr_attached_sva_domains -=3D 1; + arm_smmu_mmu_notifier_put(sva_domain->smmu_mn); mutex_unlock(&sva_lock); } =20 @@ -572,7 +550,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_doma= in *domain, struct mm_struct *mm =3D domain->mm; =20 mutex_lock(&sva_lock); - ret =3D __arm_smmu_sva_bind(dev, mm); + ret =3D __arm_smmu_sva_bind(dev, to_sva_domain(domain), mm); mutex_unlock(&sva_lock); =20 return ret; @@ -590,12 +568,11 @@ static const struct iommu_domain_ops arm_smmu_sva_dom= ain_ops =3D { =20 struct iommu_domain *arm_smmu_sva_domain_alloc(void) { - struct iommu_domain *domain; + struct arm_smmu_sva_domain *sva_domain; =20 - domain =3D kzalloc(sizeof(*domain), GFP_KERNEL); - if (!domain) + sva_domain =3D kzalloc(sizeof(*sva_domain), GFP_KERNEL); + if (!sva_domain) return NULL; - domain->ops =3D &arm_smmu_sva_domain_ops; - - return domain; + sva_domain->iommu_domain.ops =3D &arm_smmu_sva_domain_ops; + return &sva_domain->iommu_domain; } diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.c index a6fa56585c219..b7f834dde85d1 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2784,7 +2784,6 @@ static struct iommu_device *arm_smmu_probe_device(str= uct device *dev) =20 master->dev =3D dev; master->smmu =3D smmu; - INIT_LIST_HEAD(&master->bonds); dev_iommu_priv_set(dev, master); =20 ret =3D arm_smmu_insert_master(smmu, master); diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.h index 48795a7287b69..3525d60668c23 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -705,7 +705,7 @@ struct arm_smmu_master { bool stall_enabled; bool sva_enabled; bool iopf_enabled; - struct list_head bonds; + unsigned int nr_attached_sva_domains; unsigned int ssid_bits; unsigned int nr_attached_pasid_domains; }; --=20 2.41.0.162.gfafddb0af9-goog