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 6AB3EC433F5 for ; Sat, 7 May 2022 07:21:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1446009AbiEGHYw (ORCPT ); Sat, 7 May 2022 03:24:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1446033AbiEGHYm (ORCPT ); Sat, 7 May 2022 03:24:42 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 09118625F for ; Sat, 7 May 2022 00:20:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1651908054; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qxWCBX67LoypfOKx41q1WWRqT+GYqMu3J8aV+HRfxD0=; b=FKM/KgNYCxSRPj88Ti3Eys4rbAIn1jOqsMWH0lFzWsehcbEls4dxTD+5yHAtP0vgItGw5d y5uu3Y6NIfWVsxd7Sa8PEA5R9kNTX0yfE19cteAkMuy43x/kFLdhR8TjWMLkVFG9dDO052 aBRmP9otbMV1/EZUce/aKx8gkVHor3s= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-107-bDC2OH_FNzO-ijjO9wdlzA-1; Sat, 07 May 2022 03:20:50 -0400 X-MC-Unique: bDC2OH_FNzO-ijjO9wdlzA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D5F7B8002B2; Sat, 7 May 2022 07:20:49 +0000 (UTC) Received: from localhost.localdomain (ovpn-13-216.pek2.redhat.com [10.72.13.216]) by smtp.corp.redhat.com (Postfix) with ESMTP id E018240D2971; Sat, 7 May 2022 07:20:42 +0000 (UTC) From: Jason Wang To: jasowang@redhat.com, mst@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, peterz@infradead.org, paulmck@kernel.org, maz@kernel.org, pasic@linux.ibm.com, cohuck@redhat.com, eperezma@redhat.com, lulu@redhat.com, sgarzare@redhat.com, xuanzhuo@linux.alibaba.com Subject: [PATCH V4 7/9] virtio: allow to unbreak virtqueue Date: Sat, 7 May 2022 15:19:52 +0800 Message-Id: <20220507071954.14455-8-jasowang@redhat.com> In-Reply-To: <20220507071954.14455-1-jasowang@redhat.com> References: <20220507071954.14455-1-jasowang@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch allows the new introduced __virtio_break_device() to unbreak the virtqueue. Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: "Paul E. McKenney" Cc: Marc Zyngier Cc: Halil Pasic Cc: Cornelia Huck Signed-off-by: Jason Wang --- drivers/virtio/virtio_ring.c | 21 +++++++++++++++++++++ include/linux/virtio.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index cfb028ca238e..5b7df7c455f0 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2397,6 +2397,27 @@ void virtio_break_device(struct virtio_device *dev) } EXPORT_SYMBOL_GPL(virtio_break_device); +/* + * This should allow the device to be used by the driver. You may + * need to grab appropriate locks to flush. This should only be used + * in some specific case e.g (probing and restoring). Driver should + * not call this directly. + */ +void __virtio_unbreak_device(struct virtio_device *dev) +{ + struct virtqueue *_vq; + + spin_lock(&dev->vqs_list_lock); + list_for_each_entry(_vq, &dev->vqs, list) { + struct vring_virtqueue *vq = to_vvq(_vq); + + /* Pairs with READ_ONCE() in virtqueue_is_broken(). */ + WRITE_ONCE(vq->broken, false); + } + spin_unlock(&dev->vqs_list_lock); +} +EXPORT_SYMBOL_GPL(__virtio_unbreak_device); + dma_addr_t virtqueue_get_desc_addr(struct virtqueue *_vq) { struct vring_virtqueue *vq = to_vvq(_vq); diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 5464f398912a..d8fdf170637c 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -131,6 +131,7 @@ void unregister_virtio_device(struct virtio_device *dev); bool is_virtio_device(struct device *dev); void virtio_break_device(struct virtio_device *dev); +void __virtio_unbreak_device(struct virtio_device *dev); void virtio_config_changed(struct virtio_device *dev); #ifdef CONFIG_PM_SLEEP -- 2.25.1