4  * Copyright (c) 2010-2013 Spectra Logic Corporation
9  * Copyright (c) 2003-2004, Keir Fraser & Steve Hand
46 	(((segs) - 1) * PAGE_SIZE)
63  * negotiated block-front/back communication channel.  Allow enough
70  * block-front/back communication channel.
94 	((segs + XBD_MAX_SEGMENTS_PER_PAGE - 1) / XBD_MAX_SEGMENTS_PER_PAGE)
102 	/* Bus DMA returned EINPROGRESS for this command. */
159 	XBDF_GNT_SHORTAGE = 1 << 5, /* Grant ref resource shortage active */
194 	 * hot-unplug unless this is 0.
211 	cmq = &sc->xbd_cm_q[index];  in xbd_added_qentry()
212 	cmq->q_length++;  in xbd_added_qentry()
213 	if (cmq->q_length > cmq->q_max)  in xbd_added_qentry()
214 		cmq->q_max = cmq->q_length;  in xbd_added_qentry()
220 	sc->xbd_cm_q[index].q_length--;  in xbd_removed_qentry()
226 	return (sc->xbd_cm_q[index].q_length);  in xbd_queue_length()
234 	cmq = &sc->xbd_cm_q[index];  in xbd_initq_cm()
235 	TAILQ_INIT(&cmq->q_tailq);  in xbd_initq_cm()
236 	cmq->q_length = 0;  in xbd_initq_cm()
237 	cmq->q_max = 0;  in xbd_initq_cm()
245 	if ((cm->cm_flags & XBDCF_Q_MASK) != XBD_Q_NONE)  in xbd_enqueue_cm()
247 		    __func__, cm, cm->cm_flags & XBDCF_Q_MASK);  in xbd_enqueue_cm()
248 	TAILQ_INSERT_TAIL(&cm->cm_sc->xbd_cm_q[index].q_tailq, cm, cm_link);  in xbd_enqueue_cm()
249 	cm->cm_flags &= ~XBDCF_Q_MASK;  in xbd_enqueue_cm()
250 	cm->cm_flags |= index;  in xbd_enqueue_cm()
251 	xbd_added_qentry(cm->cm_sc, index);  in xbd_enqueue_cm()
259 	if ((cm->cm_flags & XBDCF_Q_MASK) != XBD_Q_NONE)  in xbd_requeue_cm()
261 		    __func__, cm, cm->cm_flags & XBDCF_Q_MASK);  in xbd_requeue_cm()
262 	TAILQ_INSERT_HEAD(&cm->cm_sc->xbd_cm_q[index].q_tailq, cm, cm_link);  in xbd_requeue_cm()
263 	cm->cm_flags &= ~XBDCF_Q_MASK;  in xbd_requeue_cm()
264 	cm->cm_flags |= index;  in xbd_requeue_cm()
265 	xbd_added_qentry(cm->cm_sc, index);  in xbd_requeue_cm()
276 	if ((cm = TAILQ_FIRST(&sc->xbd_cm_q[index].q_tailq)) != NULL) {  in xbd_dequeue_cm()
277 		if ((cm->cm_flags & XBDCF_Q_MASK) != index) {  in xbd_dequeue_cm()
281 			    cm->cm_flags & XBDCF_Q_MASK,  in xbd_dequeue_cm()
284 		TAILQ_REMOVE(&sc->xbd_cm_q[index].q_tailq, cm, cm_link);  in xbd_dequeue_cm()
285 		cm->cm_flags &= ~XBDCF_Q_MASK;  in xbd_dequeue_cm()
286 		cm->cm_flags |= XBD_Q_NONE;  in xbd_dequeue_cm()
287 		xbd_removed_qentry(cm->cm_sc, index);  in xbd_dequeue_cm()
297 	index = cm->cm_flags & XBDCF_Q_MASK;  in xbd_remove_cm()
306 	TAILQ_REMOVE(&cm->cm_sc->xbd_cm_q[index].q_tailq, cm, cm_link);  in xbd_remove_cm()
307 	cm->cm_flags &= ~XBDCF_Q_MASK;  in xbd_remove_cm()
308 	cm->cm_flags |= XBD_Q_NONE;  in xbd_remove_cm()
309 	xbd_removed_qentry(cm->cm_sc, index);  in xbd_remove_cm()
315 	bioq_init(&sc->xbd_bioq);  in xbd_initq_bio()
321 	bioq_insert_tail(&sc->xbd_bioq, bp);  in xbd_enqueue_bio()
328 	bioq_insert_head(&sc->xbd_bioq, bp);  in xbd_requeue_bio()
337 	if ((bp = bioq_first(&sc->xbd_bioq)) != NULL) {  in xbd_dequeue_bio()
338 		bioq_remove(&sc->xbd_bioq, bp);  in xbd_dequeue_bio()