From patchwork Mon Mar 11 02:44:02 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wanlong Gao X-Patchwork-Id: 2246341 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 8CFE3DF24C for ; Mon, 11 Mar 2013 02:43:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753845Ab3CKCmj (ORCPT ); Sun, 10 Mar 2013 22:42:39 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:37170 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753803Ab3CKCmh (ORCPT ); Sun, 10 Mar 2013 22:42:37 -0400 X-IronPort-AV: E=Sophos;i="4.84,820,1355068800"; d="scan'208";a="6847256" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 11 Mar 2013 10:40:08 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id r2B2gWxx007626; Mon, 11 Mar 2013 10:42:33 +0800 Received: from gaowanlong.fnst.cn.fujitsu.com ([10.167.233.84]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2013031110412198-744586 ; Mon, 11 Mar 2013 10:41:21 +0800 From: Wanlong Gao To: linux-kernel@vger.kernel.org Cc: rusty@rustcorp.com.au, mst@redhat.com, asias@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-scsi@vger.kernel.org, JBottomley@parallels.com, pbonzini@redhat.com, Wanlong Gao Subject: [PATCH V4 5/5] virtio-scsi: reset virtqueue affinity when doing cpu hotplug Date: Mon, 11 Mar 2013 10:44:02 +0800 Message-Id: <1362969842-9145-6-git-send-email-gaowanlong@cn.fujitsu.com> X-Mailer: git-send-email 1.8.2.rc2 In-Reply-To: <1362969842-9145-1-git-send-email-gaowanlong@cn.fujitsu.com> References: <1362969842-9145-1-git-send-email-gaowanlong@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/03/11 10:41:21, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/03/11 10:41:23, Serialize complete at 2013/03/11 10:41:23 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add hot cpu notifier to reset the request virtqueue affinity when doing cpu hotplug. Cc: linux-scsi@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Wanlong Gao --- drivers/scsi/virtio_scsi.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 7a54293..3bb2bf4 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -112,6 +112,9 @@ struct virtio_scsi { /* Does the affinity hint is set for virtqueues? */ bool affinity_hint_set; + /* CPU hotplug notifier */ + struct notifier_block nb; + struct virtio_scsi_vq ctrl_vq; struct virtio_scsi_vq event_vq; struct virtio_scsi_vq req_vqs[]; @@ -736,6 +739,23 @@ static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) put_online_cpus(); } +static int virtscsi_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + struct virtio_scsi *vscsi = container_of(nfb, struct virtio_scsi, nb); + switch(action) { + case CPU_ONLINE: + case CPU_ONLINE_FROZEN: + case CPU_DEAD: + case CPU_DEAD_FROZEN: + __virtscsi_set_affinity(vscsi, true); + break; + default: + break; + } + return NOTIFY_OK; +} + static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq, struct virtqueue *vq) { @@ -874,6 +894,13 @@ static int virtscsi_probe(struct virtio_device *vdev) if (err) goto virtscsi_init_failed; + vscsi->nb.notifier_call = &virtscsi_cpu_callback; + err = register_hotcpu_notifier(&vscsi->nb); + if (err) { + pr_err("registering cpu notifier failed\n"); + goto scsi_add_host_failed; + } + cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1; shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue); shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF; @@ -911,6 +938,8 @@ static void virtscsi_remove(struct virtio_device *vdev) scsi_remove_host(shost); + unregister_hotcpu_notifier(&vscsi->nb); + virtscsi_remove_vqs(vdev); scsi_host_put(shost); }