From patchwork Tue Apr 9 08:51:39 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Asias He X-Patchwork-Id: 2413561 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 831E73FC71 for ; Tue, 9 Apr 2013 08:52:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935017Ab3DIIwa (ORCPT ); Tue, 9 Apr 2013 04:52:30 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58061 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934874Ab3DIIw1 (ORCPT ); Tue, 9 Apr 2013 04:52:27 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r398qOPD016136 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 9 Apr 2013 04:52:24 -0400 Received: from hj.localdomain.com ([10.66.4.126]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r398ppl9024824; Tue, 9 Apr 2013 04:52:18 -0400 From: Asias He To: Nicholas Bellinger Cc: Paolo Bonzini , Stefan Hajnoczi , "Michael S. Tsirkin" , Rusty Russell , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, target-devel@vger.kernel.org, Asias He Subject: [PATCH v5 3/3] tcm_vhost: Add hotplug/hotunplug support Date: Tue, 9 Apr 2013 16:51:39 +0800 Message-Id: <1365497499-9172-4-git-send-email-asias@redhat.com> In-Reply-To: <1365497499-9172-1-git-send-email-asias@redhat.com> References: <1365497499-9172-1-git-send-email-asias@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In commit 365a7150094 ([SCSI] virtio-scsi: hotplug support for virtio-scsi), hotplug support is added to virtio-scsi. This patch adds hotplug and hotunplug support to tcm_vhost. You can create or delete a LUN in targetcli to hotplug or hotunplug a LUN in guest. Changes in v5: - Switch to int from u64 to vs_events_nr - Set s->vs_events_dropped flag in tcm_vhost_allocate_evt - Do not nest dev mutex within vq mutex - Use vs_events_lock to protect vs_events_dropped and vs_events_nr - Rebase to target/master Changes in v4: - Drop tcm_vhost_check_endpoint in tcm_vhost_send_evt - Add tcm_vhost_check_endpoint in vhost_scsi_evt_handle_kick Changes in v3: - Separate the bug fix to another thread Changes in v2: - Remove code duplication in tcm_vhost_{hotplug,hotunplug} - Fix racing of vs_events_nr - Add flush fix patch to this series Signed-off-by: Asias He Reviewed-by: Stefan Hajnoczi --- drivers/vhost/tcm_vhost.c | 206 +++++++++++++++++++++++++++++++++++++++++++++- drivers/vhost/tcm_vhost.h | 10 +++ 2 files changed, 212 insertions(+), 4 deletions(-) diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c index 7069881..3351ed3 100644 --- a/drivers/vhost/tcm_vhost.c +++ b/drivers/vhost/tcm_vhost.c @@ -66,11 +66,13 @@ enum { * TODO: debug and remove the workaround. */ enum { - VHOST_SCSI_FEATURES = VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX) + VHOST_SCSI_FEATURES = (VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)) | + (1ULL << VIRTIO_SCSI_F_HOTPLUG) }; #define VHOST_SCSI_MAX_TARGET 256 #define VHOST_SCSI_MAX_VQ 128 +#define VHOST_SCSI_MAX_EVENT 128 struct vhost_scsi { /* Protected by vhost_scsi->dev.mutex */ @@ -82,6 +84,13 @@ struct vhost_scsi { struct vhost_work vs_completion_work; /* cmd completion work item */ struct llist_head vs_completion_list; /* cmd completion queue */ + + struct vhost_work vs_event_work; /* evt injection work item */ + struct llist_head vs_event_list; /* evt injection queue */ + + struct mutex vs_events_lock; /* protect vs_events_dropped,events_nr */ + bool vs_events_dropped; /* any missed events */ + int vs_events_nr; /* num of pending events */ }; /* Local pointer to allocated TCM configfs fabric module */ @@ -129,6 +138,17 @@ static bool tcm_vhost_check_endpoint(struct vhost_virtqueue *vq) return ret; } +static bool tcm_vhost_check_events_dropped(struct vhost_scsi *vs) +{ + bool ret; + + mutex_lock(&vs->vs_events_lock); + ret = vs->vs_events_dropped; + mutex_unlock(&vs->vs_events_lock); + + return ret; +} + static int tcm_vhost_check_true(struct se_portal_group *se_tpg) { return 1; @@ -379,6 +399,37 @@ static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) return 0; } +static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) +{ + mutex_lock(&vs->vs_events_lock); + vs->vs_events_nr--; + kfree(evt); + mutex_unlock(&vs->vs_events_lock); +} + +static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs, + u32 event, u32 reason) +{ + struct tcm_vhost_evt *evt; + + mutex_lock(&vs->vs_events_lock); + if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { + vs->vs_events_dropped = true; + mutex_unlock(&vs->vs_events_lock); + return NULL; + } + + evt = kzalloc(sizeof(*evt), GFP_KERNEL); + if (evt) { + evt->event.event = event; + evt->event.reason = reason; + vs->vs_events_nr++; + } + mutex_unlock(&vs->vs_events_lock); + + return evt; +} + static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd) { struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd; @@ -397,6 +448,74 @@ static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd) kfree(tv_cmd); } +static void tcm_vhost_do_evt_work(struct vhost_scsi *vs, + struct virtio_scsi_event *event) +{ + struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT]; + struct virtio_scsi_event __user *eventp; + unsigned out, in; + int head, ret; + + if (!tcm_vhost_check_endpoint(vq)) + return; + + mutex_lock(&vs->vs_events_lock); + mutex_lock(&vq->mutex); +again: + vhost_disable_notify(&vs->dev, vq); + head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, + ARRAY_SIZE(vq->iov), &out, &in, + NULL, NULL); + if (head < 0) { + vs->vs_events_dropped = true; + goto out; + } + if (head == vq->num) { + if (vhost_enable_notify(&vs->dev, vq)) + goto again; + vs->vs_events_dropped = true; + goto out; + } + + if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { + vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", + vq->iov[out].iov_len); + vs->vs_events_dropped = true; + goto out; + } + + if (vs->vs_events_dropped) { + event->event |= VIRTIO_SCSI_T_EVENTS_MISSED; + vs->vs_events_dropped = false; + } + + eventp = vq->iov[out].iov_base; + ret = __copy_to_user(eventp, event, sizeof(*event)); + if (!ret) + vhost_add_used_and_signal(&vs->dev, vq, head, 0); + else + vq_err(vq, "Faulted on tcm_vhost_send_event\n"); +out: + mutex_unlock(&vq->mutex); + mutex_unlock(&vs->vs_events_lock); +} + +static void tcm_vhost_evt_work(struct vhost_work *work) +{ + struct vhost_scsi *vs = container_of(work, struct vhost_scsi, + vs_event_work); + struct tcm_vhost_evt *evt; + struct llist_node *llnode; + + llnode = llist_del_all(&vs->vs_event_list); + while (llnode) { + evt = llist_entry(llnode, struct tcm_vhost_evt, list); + llnode = llist_next(llnode); + tcm_vhost_do_evt_work(vs, &evt->event); + tcm_vhost_free_evt(vs, evt); + } +} + /* Fill in status and signal that we are done processing this command * * This is scheduled in the vhost work queue so we are called with the owner @@ -804,9 +923,42 @@ static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) pr_debug("%s: The handling func for control queue.\n", __func__); } +static int tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg, + struct se_lun *lun, u32 event, u32 reason) +{ + struct tcm_vhost_evt *evt; + + evt = tcm_vhost_allocate_evt(vs, event, reason); + if (!evt) + return -ENOMEM; + + if (tpg && lun) { + /* TODO: share lun setup code with virtio-scsi.ko */ + evt->event.lun[0] = 0x01; + evt->event.lun[1] = tpg->tport_tpgt & 0xFF; + if (lun->unpacked_lun >= 256) + evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; + evt->event.lun[3] = lun->unpacked_lun & 0xFF; + } + + llist_add(&evt->list, &vs->vs_event_list); + vhost_work_queue(&vs->dev, &vs->vs_event_work); + + return 0; +} + static void vhost_scsi_evt_handle_kick(struct vhost_work *work) { - pr_debug("%s: The handling func for event queue.\n", __func__); + struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, + poll.work); + struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); + + if (!tcm_vhost_check_endpoint(vq)) + return; + + if (tcm_vhost_check_events_dropped(vs)) + tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); + } static void vhost_scsi_handle_kick(struct vhost_work *work) @@ -888,6 +1040,7 @@ static int vhost_scsi_set_endpoint( return -EEXIST; } tv_tpg->tv_tpg_vhost_count++; + tv_tpg->vhost_scsi = vs; vs_tpg[tv_tpg->tport_tpgt] = tv_tpg; smp_mb__after_atomic_inc(); match = true; @@ -971,6 +1124,7 @@ static int vhost_scsi_clear_endpoint( goto err_tpg; } tv_tpg->tv_tpg_vhost_count--; + tv_tpg->vhost_scsi = NULL; vs->vs_tpg[target] = NULL; match = true; mutex_unlock(&tv_tpg->tv_tpg_mutex); @@ -1030,6 +1184,11 @@ static int vhost_scsi_open(struct inode *inode, struct file *f) return -ENOMEM; vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work); + vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work); + + s->vs_events_nr = 0; + s->vs_events_dropped = false; + mutex_init(&s->vs_events_lock); s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick; s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick; @@ -1160,6 +1319,42 @@ static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) return "Unknown"; } +static int tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, + struct se_lun *lun, bool plug) +{ + + struct vhost_scsi *vs = tpg->vhost_scsi; + u32 reason; + + mutex_lock(&tpg->tv_tpg_mutex); + vs = tpg->vhost_scsi; + mutex_unlock(&tpg->tv_tpg_mutex); + if (!vs) + return -EOPNOTSUPP; + + if (!tcm_vhost_check_feature(vs, VIRTIO_SCSI_F_HOTPLUG)) + return -EOPNOTSUPP; + + if (plug) + reason = VIRTIO_SCSI_EVT_RESET_RESCAN; + else + reason = VIRTIO_SCSI_EVT_RESET_REMOVED; + + return tcm_vhost_send_evt(vs, tpg, lun, + VIRTIO_SCSI_T_TRANSPORT_RESET, + reason); +} + +static int tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) +{ + return tcm_vhost_do_plug(tpg, lun, true); +} + +static int tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) +{ + return tcm_vhost_do_plug(tpg, lun, false); +} + static int tcm_vhost_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) { @@ -1170,18 +1365,21 @@ static int tcm_vhost_port_link(struct se_portal_group *se_tpg, tv_tpg->tv_tpg_port_count++; mutex_unlock(&tv_tpg->tv_tpg_mutex); + tcm_vhost_hotplug(tv_tpg, lun); + return 0; } static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, - struct se_lun *se_lun) + struct se_lun *lun) { struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg, struct tcm_vhost_tpg, se_tpg); - mutex_lock(&tv_tpg->tv_tpg_mutex); tv_tpg->tv_tpg_port_count--; mutex_unlock(&tv_tpg->tv_tpg_mutex); + + tcm_vhost_hotunplug(tv_tpg, lun); } static struct se_node_acl *tcm_vhost_make_nodeacl( diff --git a/drivers/vhost/tcm_vhost.h b/drivers/vhost/tcm_vhost.h index 1d2ae7a..94e9ee53 100644 --- a/drivers/vhost/tcm_vhost.h +++ b/drivers/vhost/tcm_vhost.h @@ -53,6 +53,7 @@ struct tcm_vhost_nacl { struct se_node_acl se_node_acl; }; +struct vhost_scsi; struct tcm_vhost_tpg { /* Vhost port target portal group tag for TCM */ u16 tport_tpgt; @@ -70,6 +71,8 @@ struct tcm_vhost_tpg { struct tcm_vhost_tport *tport; /* Returned by tcm_vhost_make_tpg() */ struct se_portal_group se_tpg; + /* Pointer back to struct vhost_scsi, protected by tv_tpg_mutex */ + struct vhost_scsi *vhost_scsi; }; struct tcm_vhost_tport { @@ -83,6 +86,13 @@ struct tcm_vhost_tport { struct se_wwn tport_wwn; }; +struct tcm_vhost_evt { + /* virtio_scsi event */ + struct virtio_scsi_event event; + /* virtio_scsi event list, serviced from vhost worker thread */ + struct llist_node list; +}; + /* * As per request from MST, keep TCM_VHOST related ioctl defines out of * linux/vhost.h (user-space) for now..