From nobody Thu Sep 19 02:01:56 2024 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1F6EA1741C3; Fri, 26 Jul 2024 07:24:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721978687; cv=none; b=VfzmGuV29VlVzKRz9M1TYgm/ULqlEVQDU2pgj3YV5RNt/wUdVUPXW+0cI2lu7GRKAxk4oWMjFAx7luD05oQWhlS9TNXdqgq3a1qqbtF90nJHtdGxDBS16yLoYhkRyQpPwE16eRa5Ba6Mv9tZKtG3NKX9lLnEYMDBi9x5pQwrPkc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721978687; c=relaxed/simple; bh=Tsw5OhV4f4IyQdap6kmuzvQ8xK9TFRXPDuKndjHnCjY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Alt+QWaUToYVAloPZdTzLWKvjx8rvGFt+rP2nHGJLQLbcryiENNrCkm++rBeQ9ZWOYHTIWGIXqsWDmMeP6KQz5VCxjcKC5UhgK8WEmJx63twCY9KjwAJPyYgYDHYeYBHAG69ZeWRD7IwyLWu4h9rgzCtyScIS581F7OH0edb98g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com; spf=pass smtp.mailfrom=hisilicon.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hisilicon.com Received: from mail.maildlp.com (unknown [172.19.163.48]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4WVfPY4vZHzncbr; Fri, 26 Jul 2024 15:23:45 +0800 (CST) Received: from kwepemf100018.china.huawei.com (unknown [7.202.181.17]) by mail.maildlp.com (Postfix) with ESMTPS id 4BB6718009E; Fri, 26 Jul 2024 15:24:37 +0800 (CST) Received: from localhost.localdomain (10.90.30.45) by kwepemf100018.china.huawei.com (7.202.181.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 26 Jul 2024 15:24:36 +0800 From: Junxian Huang To: , CC: , , , Subject: [PATCH for-next 1/3] RDMA/core: Provide rdma_user_mmap_disassociate() to disassociate mmap pages Date: Fri, 26 Jul 2024 15:19:08 +0800 Message-ID: <20240726071910.626802-2-huangjunxian6@hisilicon.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240726071910.626802-1-huangjunxian6@hisilicon.com> References: <20240726071910.626802-1-huangjunxian6@hisilicon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemf100018.china.huawei.com (7.202.181.17) Content-Type: text/plain; charset="utf-8" From: Chengchang Tang Provide a new api rdma_user_mmap_disassociate() for drivers to disassociate mmap pages for ucontext. This api relies on uverbs_user_mmap_disassociate() in ib_uverbs, causing ib_core relying on ib_uverbs. To avoid this, move uverbs_user_mmap_disassociate() to ib_core_uverbs.c. Signed-off-by: Chengchang Tang Signed-off-by: Junxian Huang --- drivers/infiniband/core/ib_core_uverbs.c | 85 ++++++++++++++++++++++++ drivers/infiniband/core/rdma_core.h | 1 - drivers/infiniband/core/uverbs_main.c | 64 ------------------ include/rdma/ib_verbs.h | 3 + 4 files changed, 88 insertions(+), 65 deletions(-) diff --git a/drivers/infiniband/core/ib_core_uverbs.c b/drivers/infiniband/= core/ib_core_uverbs.c index b51bd7087a88..4e27389a75ad 100644 --- a/drivers/infiniband/core/ib_core_uverbs.c +++ b/drivers/infiniband/core/ib_core_uverbs.c @@ -5,6 +5,7 @@ * Copyright 2019 Marvell. All rights reserved. */ #include +#include #include "uverbs.h" #include "core_priv.h" =20 @@ -365,3 +366,87 @@ int rdma_user_mmap_entry_insert(struct ib_ucontext *uc= ontext, U32_MAX); } EXPORT_SYMBOL(rdma_user_mmap_entry_insert); + +void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile) +{ + struct rdma_umap_priv *priv, *next_priv; + + lockdep_assert_held(&ufile->hw_destroy_rwsem); + + while (1) { + struct mm_struct *mm =3D NULL; + + /* Get an arbitrary mm pointer that hasn't been cleaned yet */ + mutex_lock(&ufile->umap_lock); + while (!list_empty(&ufile->umaps)) { + int ret; + + priv =3D list_first_entry(&ufile->umaps, + struct rdma_umap_priv, list); + mm =3D priv->vma->vm_mm; + ret =3D mmget_not_zero(mm); + if (!ret) { + list_del_init(&priv->list); + if (priv->entry) { + rdma_user_mmap_entry_put(priv->entry); + priv->entry =3D NULL; + } + mm =3D NULL; + continue; + } + break; + } + mutex_unlock(&ufile->umap_lock); + if (!mm) + return; + + /* + * The umap_lock is nested under mmap_lock since it used within + * the vma_ops callbacks, so we have to clean the list one mm + * at a time to get the lock ordering right. Typically there + * will only be one mm, so no big deal. + */ + mmap_read_lock(mm); + mutex_lock(&ufile->umap_lock); + list_for_each_entry_safe(priv, next_priv, &ufile->umaps, list) { + struct vm_area_struct *vma =3D priv->vma; + + if (vma->vm_mm !=3D mm) + continue; + list_del_init(&priv->list); + + zap_vma_ptes(vma, vma->vm_start, + vma->vm_end - vma->vm_start); + + if (priv->entry) { + rdma_user_mmap_entry_put(priv->entry); + priv->entry =3D NULL; + } + } + mutex_unlock(&ufile->umap_lock); + mmap_read_unlock(mm); + mmput(mm); + } +} +EXPORT_SYMBOL(uverbs_user_mmap_disassociate); + +/** + * rdma_user_mmap_disassociate() - disassociate the mmap from the ucontext. + * + * @ucontext: associated user context. + * + * This function should be called by drivers that need to disable mmap for + * some ucontexts. + */ +void rdma_user_mmap_disassociate(struct ib_ucontext *ucontext) +{ + struct ib_uverbs_file *ufile =3D ucontext->ufile; + + /* Racing with uverbs_destroy_ufile_hw */ + if (!down_read_trylock(&ufile->hw_destroy_rwsem)) + return; + + uverbs_user_mmap_disassociate(ufile); + up_read(&ufile->hw_destroy_rwsem); +} +EXPORT_SYMBOL(rdma_user_mmap_disassociate); diff --git a/drivers/infiniband/core/rdma_core.h b/drivers/infiniband/core/= rdma_core.h index 33706dad6c0f..ad01fbd52c48 100644 --- a/drivers/infiniband/core/rdma_core.h +++ b/drivers/infiniband/core/rdma_core.h @@ -149,7 +149,6 @@ void uverbs_disassociate_api(struct uverbs_api *uapi); void uverbs_destroy_api(struct uverbs_api *uapi); void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm, unsigned int num_attrs); -void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile); =20 extern const struct uapi_definition uverbs_def_obj_async_fd[]; extern const struct uapi_definition uverbs_def_obj_counters[]; diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/cor= e/uverbs_main.c index bc099287de9a..e7cacbc3fe03 100644 --- a/drivers/infiniband/core/uverbs_main.c +++ b/drivers/infiniband/core/uverbs_main.c @@ -45,7 +45,6 @@ #include #include #include -#include =20 #include =20 @@ -817,69 +816,6 @@ static const struct vm_operations_struct rdma_umap_ops= =3D { .fault =3D rdma_umap_fault, }; =20 -void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile) -{ - struct rdma_umap_priv *priv, *next_priv; - - lockdep_assert_held(&ufile->hw_destroy_rwsem); - - while (1) { - struct mm_struct *mm =3D NULL; - - /* Get an arbitrary mm pointer that hasn't been cleaned yet */ - mutex_lock(&ufile->umap_lock); - while (!list_empty(&ufile->umaps)) { - int ret; - - priv =3D list_first_entry(&ufile->umaps, - struct rdma_umap_priv, list); - mm =3D priv->vma->vm_mm; - ret =3D mmget_not_zero(mm); - if (!ret) { - list_del_init(&priv->list); - if (priv->entry) { - rdma_user_mmap_entry_put(priv->entry); - priv->entry =3D NULL; - } - mm =3D NULL; - continue; - } - break; - } - mutex_unlock(&ufile->umap_lock); - if (!mm) - return; - - /* - * The umap_lock is nested under mmap_lock since it used within - * the vma_ops callbacks, so we have to clean the list one mm - * at a time to get the lock ordering right. Typically there - * will only be one mm, so no big deal. - */ - mmap_read_lock(mm); - mutex_lock(&ufile->umap_lock); - list_for_each_entry_safe (priv, next_priv, &ufile->umaps, - list) { - struct vm_area_struct *vma =3D priv->vma; - - if (vma->vm_mm !=3D mm) - continue; - list_del_init(&priv->list); - - zap_vma_ptes(vma, vma->vm_start, - vma->vm_end - vma->vm_start); - - if (priv->entry) { - rdma_user_mmap_entry_put(priv->entry); - priv->entry =3D NULL; - } - } - mutex_unlock(&ufile->umap_lock); - mmap_read_unlock(mm); - mmput(mm); - } -} - /* * ib_uverbs_open() does not need the BKL: * diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 6c5712ae559d..4175e3588b77 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -2947,6 +2947,7 @@ int rdma_user_mmap_entry_insert_range(struct ib_ucont= ext *ucontext, struct rdma_user_mmap_entry *entry, size_t length, u32 min_pgoff, u32 max_pgoff); +void rdma_user_mmap_disassociate(struct ib_ucontext *ucontext); =20 static inline int rdma_user_mmap_entry_insert_exact(struct ib_ucontext *ucontext, @@ -4729,6 +4730,8 @@ struct ib_ucontext *ib_uverbs_get_ucontext_file(struc= t ib_uverbs_file *ufile); =20 int uverbs_destroy_def_handler(struct uverbs_attr_bundle *attrs); =20 +void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile); + struct net_device *rdma_alloc_netdev(struct ib_device *device, u32 port_nu= m, enum rdma_netdev_t type, const char *name, unsigned char name_assign_type, --=20 2.33.0