#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 */
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 */
+
+ bool vs_events_missed; /* any missed events, protected by vq->mutex */
+ int vs_events_nr; /* num of pending events, protected by vq->mutex */
};
/* Local pointer to allocated TCM configfs fabric module */
return 0;
}
+static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
+{
+ vs->vs_events_nr--;
+ kfree(evt);
+}
+
+static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
+ u32 event, u32 reason)
+{
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+ struct tcm_vhost_evt *evt;
+
+ if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
+ vs->vs_events_missed = true;
+ return NULL;
+ }
+
+ evt = kzalloc(sizeof(*evt), GFP_KERNEL);
+ if (!evt) {
+ vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
+ vs->vs_events_missed = true;
+ return NULL;
+ }
+
+ evt->event.event = event;
+ evt->event.reason = reason;
+ vs->vs_events_nr++;
+
+ return evt;
+}
+
static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
{
struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
kfree(tv_cmd);
}
+static void tcm_vhost_do_evt_work(struct vhost_scsi *vs,
+ struct tcm_vhost_evt *evt)
+{
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+ struct virtio_scsi_event *event = &evt->event;
+ struct virtio_scsi_event __user *eventp;
+ unsigned out, in;
+ int head, ret;
+
+ if (!vq->private_data) {
+ vs->vs_events_missed = true;
+ return;
+ }
+
+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_missed = true;
+ return;
+ }
+ if (head == vq->num) {
+ if (vhost_enable_notify(&vs->dev, vq))
+ goto again;
+ vs->vs_events_missed = true;
+ return;
+ }
+
+ 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_missed = true;
+ return;
+ }
+
+ if (vs->vs_events_missed) {
+ event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
+ vs->vs_events_missed = 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");
+}
+
+static void tcm_vhost_evt_work(struct vhost_work *work)
+{
+ struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
+ vs_event_work);
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+ struct tcm_vhost_evt *evt;
+ struct llist_node *llnode;
+
+ mutex_lock(&vq->mutex);
+ 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);
+ tcm_vhost_free_evt(vs, evt);
+ }
+ mutex_unlock(&vq->mutex);
+}
+
/* 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
pr_debug("%s: The handling func for control queue.\n", __func__);
}
+static void 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;
+
+ if (tpg && lun) {
+ /* TODO: share lun setup code with virtio-scsi.ko */
+ /*
+ * Note: evt->event is zeroed when we allocate it and
+ * lun[4-7] need to be zero according to virtio-scsi spec.
+ */
+ 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);
+}
+
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);
+
+ mutex_lock(&vq->mutex);
+ if (!vq->private_data)
+ goto out;
+
+ if (vs->vs_events_missed)
+ tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
+out:
+ mutex_unlock(&vq->mutex);
}
static void vhost_scsi_handle_kick(struct vhost_work *work)
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
vhost_scsi_flush_vq(vs, i);
vhost_work_flush(&vs->dev, &vs->vs_completion_work);
+ vhost_work_flush(&vs->dev, &vs->vs_event_work);
}
/*
goto out;
}
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;
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);
vhost_scsi_flush(vs);
kfree(vs->vs_tpg);
vs->vs_tpg = NULL;
+ WARN_ON(vs->vs_events_nr);
mutex_unlock(&vs->dev.mutex);
mutex_unlock(&tcm_vhost_mutex);
return 0;
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_missed = false;
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;
vhost_scsi_clear_endpoint(s, &t);
vhost_dev_stop(&s->dev);
vhost_dev_cleanup(&s->dev, false);
+ /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
+ vhost_scsi_flush(s);
kfree(s);
return 0;
}
return "Unknown";
}
+static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
+ struct se_lun *lun, bool plug)
+{
+
+ struct vhost_scsi *vs = tpg->vhost_scsi;
+ struct vhost_virtqueue *vq;
+ u32 reason;
+
+ if (!vs)
+ return;
+
+ mutex_lock(&vs->dev.mutex);
+ if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) {
+ mutex_unlock(&vs->dev.mutex);
+ return;
+ }
+
+ if (plug)
+ reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
+ else
+ reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
+
+ vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+ mutex_lock(&vq->mutex);
+ tcm_vhost_send_evt(vs, tpg, lun,
+ VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
+ mutex_unlock(&vq->mutex);
+ mutex_unlock(&vs->dev.mutex);
+}
+
+static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
+{
+ tcm_vhost_do_plug(tpg, lun, true);
+}
+
+static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
+{
+ tcm_vhost_do_plug(tpg, lun, false);
+}
+
static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
struct se_lun *lun)
{
struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
struct tcm_vhost_tpg, se_tpg);
+ mutex_lock(&tcm_vhost_mutex);
+
mutex_lock(&tv_tpg->tv_tpg_mutex);
tv_tpg->tv_tpg_port_count++;
mutex_unlock(&tv_tpg->tv_tpg_mutex);
+ tcm_vhost_hotplug(tv_tpg, lun);
+
+ mutex_unlock(&tcm_vhost_mutex);
+
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(&tcm_vhost_mutex);
+
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);
+
+ mutex_unlock(&tcm_vhost_mutex);
}
static struct se_node_acl *tcm_vhost_make_nodeacl(
projects / firefly-linux-kernel-4.4.55.git / commitdiff