From patchwork Wed Mar 4 16:58:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Goyal X-Patchwork-Id: 11420483 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9BC4E139A for ; Wed, 4 Mar 2020 17:00:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7DD8224697 for ; Wed, 4 Mar 2020 17:00:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fRW49d3b" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388302AbgCDRAD (ORCPT ); Wed, 4 Mar 2020 12:00:03 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:33407 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729965AbgCDQ7S (ORCPT ); Wed, 4 Mar 2020 11:59:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583341157; 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=yNJScXKPSu34/afg2dYxwu2AJJv0EUhtGNAZFgv6Rso=; b=fRW49d3b5nRlVR4uVhDPPUUTViTgTXChbHXUQMqLNH/MqgVRt8aibV0otwTQ6DHUlwOIrV TccF7St0jia40TgfL+vNofQahxxRyfd2FyK4UhNRmWlnXVboaQvRizyy+ci3kGU1WzZpIQ iDXSj2q4FIzOvm8bsR+HuUOGAPcFP1Q= 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-429-_MIWAM0ZOIan349uUKUBcA-1; Wed, 04 Mar 2020 11:59:13 -0500 X-MC-Unique: _MIWAM0ZOIan349uUKUBcA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AD1C9800D50; Wed, 4 Mar 2020 16:59:11 +0000 (UTC) Received: from horse.redhat.com (unknown [10.18.25.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9D38D90779; Wed, 4 Mar 2020 16:59:03 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 40DEE2257D5; Wed, 4 Mar 2020 11:59:03 -0500 (EST) From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, virtio-fs@redhat.com, miklos@szeredi.hu Cc: vgoyal@redhat.com, stefanha@redhat.com, dgilbert@redhat.com, mst@redhat.com, Sebastien Boeuf Subject: [PATCH 03/20] virtio: Add get_shm_region method Date: Wed, 4 Mar 2020 11:58:28 -0500 Message-Id: <20200304165845.3081-4-vgoyal@redhat.com> In-Reply-To: <20200304165845.3081-1-vgoyal@redhat.com> References: <20200304165845.3081-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Sebastien Boeuf Virtio defines 'shared memory regions' that provide a continuously shared region between the host and guest. Provide a method to find a particular region on a device. Signed-off-by: Sebastien Boeuf Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Stefan Hajnoczi --- include/linux/virtio_config.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index bb4cc4910750..c859f000a751 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -10,6 +10,11 @@ struct irq_affinity; +struct virtio_shm_region { + u64 addr; + u64 len; +}; + /** * virtio_config_ops - operations for configuring a virtio device * Note: Do not assume that a transport implements all of the operations @@ -65,6 +70,7 @@ struct irq_affinity; * the caller can then copy. * @set_vq_affinity: set the affinity for a virtqueue (optional). * @get_vq_affinity: get the affinity for a virtqueue (optional). + * @get_shm_region: get a shared memory region based on the index. */ typedef void vq_callback_t(struct virtqueue *); struct virtio_config_ops { @@ -88,6 +94,8 @@ struct virtio_config_ops { const struct cpumask *cpu_mask); const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev, int index); + bool (*get_shm_region)(struct virtio_device *vdev, + struct virtio_shm_region *region, u8 id); }; /* If driver didn't advertise the feature, it will never appear. */ @@ -250,6 +258,15 @@ int virtqueue_set_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask) return 0; } +static inline +bool virtio_get_shm_region(struct virtio_device *vdev, + struct virtio_shm_region *region, u8 id) +{ + if (!vdev->config->get_shm_region) + return false; + return vdev->config->get_shm_region(vdev, region, id); +} + static inline bool virtio_is_little_endian(struct virtio_device *vdev) { return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||