From mboxrd@z Thu Jan 1 00:00:00 1970 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 0EDAACD98C7 for ; Wed, 11 Oct 2023 06:43:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345700AbjJKGnU (ORCPT ); Wed, 11 Oct 2023 02:43:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345610AbjJKGnP (ORCPT ); Wed, 11 Oct 2023 02:43:15 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D82E998 for ; Tue, 10 Oct 2023 23:42:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697006551; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=29YtgXv8n6Z+jTzRGYkc/Q2mHLXGKB5JoSFvVPqVJn0=; b=U54Za9U1wzF4vjM+nEsCKN5vMuAeDYCPrFB3nQ0XetQvix9KmC9S7eZPspABzRd/ZYVBK6 rYl5W6uwm4GFBVtC4EqaEe7svz4uTQug+eJ5qAeEtOpjO0yVV8HDbJkPkick1ikLXI1/dX ODWLoS7xh+diKkU4ZgSV7lJiUhXIaZg= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-674-gybUZXM6MsiCPClNZE-oFA-1; Wed, 11 Oct 2023 02:42:28 -0400 X-MC-Unique: gybUZXM6MsiCPClNZE-oFA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A9DFE382134A; Wed, 11 Oct 2023 06:42:27 +0000 (UTC) Received: from server.redhat.com (unknown [10.72.112.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id 226CC51E3; Wed, 11 Oct 2023 06:42:24 +0000 (UTC) From: Cindy Lu To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com, xieyongji@bytedance.com, linux-kernel@vger.kernel.org, maxime.coquelin@redhat.com Subject: [PATCH v1 2/4] vduse: Add file operation for mmap Date: Wed, 11 Oct 2023 14:42:06 +0800 Message-Id: <20231011064208.2143245-3-lulu@redhat.com> In-Reply-To: <20231011064208.2143245-1-lulu@redhat.com> References: <20231011064208.2143245-1-lulu@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add the operation for mmap, The user space APP will use this function to map the pages to userspace Signed-off-by: Cindy Lu --- drivers/vdpa/vdpa_user/vduse_dev.c | 66 ++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 565126a9ab01..05e72d752fb6 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1380,6 +1380,70 @@ static struct vduse_dev *vduse_dev_get_from_minor(int minor) return dev; } +static vm_fault_t vduse_vm_fault(struct vm_fault *vmf) +{ + struct vduse_dev *dev = vmf->vma->vm_file->private_data; + struct vm_area_struct *vma = vmf->vma; + u16 index = vma->vm_pgoff; + struct vduse_virtqueue *vq; + struct vdpa_reconnect_info *info; + + /* index 0 page reserved for vduse status*/ + if (index == 0) { + info = &dev->reconnect_status; + } else { + /* index 1+vq_number page reserved for vduse vqs*/ + vq = &dev->vqs[index - 1]; + info = &vq->reconnect_info; + } + if (remap_pfn_range(vma, vmf->address & PAGE_MASK, + PFN_DOWN(virt_to_phys((void *)info->vaddr)), + PAGE_SIZE, vma->vm_page_prot)) + return VM_FAULT_SIGBUS; + return VM_FAULT_NOPAGE; +} + +static const struct vm_operations_struct vduse_vm_ops = { + .fault = vduse_vm_fault, +}; + +static int vduse_dev_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct vduse_dev *dev = file->private_data; + struct vdpa_reconnect_info *info; + unsigned long index = vma->vm_pgoff; + struct vduse_virtqueue *vq; + + if (vma->vm_end - vma->vm_start != PAGE_SIZE) + return -EINVAL; + if ((vma->vm_flags & VM_SHARED) == 0) + return -EINVAL; + + if (index > dev->vq_num + 1) + return -EINVAL; + + /* index 0 page reserved for vduse status*/ + if (index == 0) { + info = &dev->reconnect_status; + } else { + /* index 1+vq_number page reserved for vduse vqs*/ + vq = &dev->vqs[index - 1]; + info = &vq->reconnect_info; + } + if (info->vaddr == 0) + return -ENOTSUPP; + + if (virt_to_phys((void *)info->vaddr) & (PAGE_SIZE - 1)) + return -EINVAL; + if (vma->vm_end - vma->vm_start != info->size) + return -EOPNOTSUPP; + + vm_flags_set(vma, VM_IO | VM_DONTDUMP); + vma->vm_ops = &vduse_vm_ops; + + return 0; +} + static int vduse_dev_open(struct inode *inode, struct file *file) { int ret; @@ -1412,6 +1476,8 @@ static const struct file_operations vduse_dev_fops = { .unlocked_ioctl = vduse_dev_ioctl, .compat_ioctl = compat_ptr_ioctl, .llseek = noop_llseek, + .mmap = vduse_dev_mmap, + }; static struct vduse_dev *vduse_dev_create(void) -- 2.34.3