From patchwork Wed Dec 16 06:48:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11976763 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9AF6FC0018C for ; Wed, 16 Dec 2020 06:51:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 496CA23371 for ; Wed, 16 Dec 2020 06:51:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726083AbgLPGvU (ORCPT ); Wed, 16 Dec 2020 01:51:20 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31459 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726066AbgLPGvT (ORCPT ); Wed, 16 Dec 2020 01:51:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608101392; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ucZFVbnSLjolInYBrTmeMC9TNcLOvT+i2R2XNtIFZQU=; b=RJWVwhuUAeTyANCaaSS4bOOzJux6Ej7GiCETfgK0uN012+0xSY7kiogpHBXflKFduQQ7Io SDDOpRu+69/ZdXRkesU9+sVb7EjZEy/p6dp1QNafIEChhCEu3JUAVYFe6gelhGao0xmRDB m4MmJjWq9sNa/uJuv/OG978O4Gs+R6g= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-195-ZZt3uHG7Nj6Th6v8eYdh2w-1; Wed, 16 Dec 2020 01:49:51 -0500 X-MC-Unique: ZZt3uHG7Nj6Th6v8eYdh2w-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7D803802B42; Wed, 16 Dec 2020 06:49:49 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-210.pek2.redhat.com [10.72.12.210]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5081A10016F5; Wed, 16 Dec 2020 06:49:35 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com Cc: eperezma@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, lulu@redhat.com, eli@mellanox.com, lingshan.zhu@intel.com, rob.miller@broadcom.com, stefanha@redhat.com, sgarzare@redhat.com Subject: [PATCH 11/21] vhost-vdpa: introduce asid based IOTLB Date: Wed, 16 Dec 2020 14:48:08 +0800 Message-Id: <20201216064818.48239-12-jasowang@redhat.com> In-Reply-To: <20201216064818.48239-1-jasowang@redhat.com> References: <20201216064818.48239-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch converts the vhost-vDPA device to support multiple IOTLBs tagged via ASID via hlist. This will be used for supporting multiple address spaces in the following patches. Signed-off-by: Jason Wang --- drivers/vhost/vdpa.c | 106 ++++++++++++++++++++++++++++++++----------- 1 file changed, 80 insertions(+), 26 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index feb6a58df22d..060d5b5b7e64 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -33,13 +33,21 @@ enum { #define VHOST_VDPA_DEV_MAX (1U << MINORBITS) +#define VHOST_VDPA_IOTLB_BUCKETS 16 + +struct vhost_vdpa_as { + struct hlist_node hash_link; + struct vhost_iotlb iotlb; + u32 id; +}; + struct vhost_vdpa { struct vhost_dev vdev; struct iommu_domain *domain; struct vhost_virtqueue *vqs; struct completion completion; struct vdpa_device *vdpa; - struct vhost_iotlb *iotlb; + struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS]; struct device dev; struct cdev cdev; atomic_t opened; @@ -49,12 +57,64 @@ struct vhost_vdpa { struct eventfd_ctx *config_ctx; int in_batch; struct vdpa_iova_range range; + int used_as; }; static DEFINE_IDA(vhost_vdpa_ida); static dev_t vhost_vdpa_major; +static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid) +{ + struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS]; + struct vhost_vdpa_as *as; + + hlist_for_each_entry(as, head, hash_link) + if (as->id == asid) + return as; + + return NULL; +} + +static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid) +{ + struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS]; + struct vhost_vdpa_as *as; + + if (asid_to_as(v, asid)) + return NULL; + + as = kmalloc(sizeof(*as), GFP_KERNEL); + if (!as) + return NULL; + + vhost_iotlb_init(&as->iotlb, 0, 0); + as->id = asid; + hlist_add_head(&as->hash_link, head); + ++v->used_as; + + return as; +} + +static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid) +{ + struct vhost_vdpa_as *as = asid_to_as(v, asid); + + /* Remove default address space is not allowed */ + if (asid == 0) + return -EINVAL; + + if (!as) + return -EINVAL; + + hlist_del(&as->hash_link); + vhost_iotlb_reset(&as->iotlb); + kfree(as); + --v->used_as; + + return 0; +} + static void handle_vq_kick(struct vhost_work *work) { struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, @@ -525,15 +585,6 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, } } -static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v) -{ - struct vhost_iotlb *iotlb = v->iotlb; - - vhost_vdpa_iotlb_unmap(v, iotlb, 0ULL, 0ULL - 1); - kfree(v->iotlb); - v->iotlb = NULL; -} - static int perm_to_iommu_flags(u32 perm) { int flags = 0; @@ -745,7 +796,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid, struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev); struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; - struct vhost_iotlb *iotlb = v->iotlb; + struct vhost_vdpa_as *as = asid_to_as(v, 0); + struct vhost_iotlb *iotlb = &as->iotlb; int r = 0; if (asid != 0) @@ -856,6 +908,13 @@ static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v) } } +static void vhost_vdpa_cleanup(struct vhost_vdpa *v) +{ + vhost_dev_cleanup(&v->vdev); + kfree(v->vdev.vqs); + vhost_vdpa_remove_as(v, 0); +} + static int vhost_vdpa_open(struct inode *inode, struct file *filep) { struct vhost_vdpa *v; @@ -886,15 +945,12 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep) vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false, vhost_vdpa_process_iotlb_msg); - v->iotlb = vhost_iotlb_alloc(0, 0); - if (!v->iotlb) { - r = -ENOMEM; - goto err_init_iotlb; - } + if (!vhost_vdpa_alloc_as(v, 0)) + goto err_alloc_as; r = vhost_vdpa_alloc_domain(v); if (r) - goto err_alloc_domain; + goto err_alloc_as; vhost_vdpa_set_iova_range(v); @@ -902,11 +958,8 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep) return 0; -err_alloc_domain: - vhost_vdpa_iotlb_free(v); -err_init_iotlb: - vhost_dev_cleanup(&v->vdev); - kfree(vqs); +err_alloc_as: + vhost_vdpa_cleanup(v); err: atomic_dec(&v->opened); return r; @@ -933,12 +986,10 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep) filep->private_data = NULL; vhost_vdpa_reset(v); vhost_dev_stop(&v->vdev); - vhost_vdpa_iotlb_free(v); vhost_vdpa_free_domain(v); vhost_vdpa_config_put(v); vhost_vdpa_clean_irq(v); - vhost_dev_cleanup(&v->vdev); - kfree(v->vdev.vqs); + vhost_vdpa_cleanup(v); mutex_unlock(&d->mutex); atomic_dec(&v->opened); @@ -1033,7 +1084,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa) const struct vdpa_config_ops *ops = vdpa->config; struct vhost_vdpa *v; int minor; - int r; + int i, r; /* Only support 1 address space and 1 groups */ if (vdpa->ngroups != 1 || vdpa->nas != 1) @@ -1085,6 +1136,9 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa) init_completion(&v->completion); vdpa_set_drvdata(vdpa, v); + for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++) + INIT_HLIST_HEAD(&v->as[i]); + return 0; err: