/*- * Copyright (c) 2012, Bryan Venteicher * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: head/sys/dev/virtio/scsi/virtio_scsivar.h 252707 2013-07-04 17:57:26Z bryanv $ */ #ifndef _VIRTIO_SCSIVAR_H #define _VIRTIO_SCSIVAR_H struct vtscsi_softc; struct vtscsi_request; typedef void vtscsi_request_cb_t(struct vtscsi_softc *, struct vtscsi_request *); struct vtscsi_statistics { unsigned long scsi_cmd_timeouts; unsigned long dequeue_no_requests; }; struct vtscsi_softc { device_t vtscsi_dev; struct lock vtscsi_mtx; uint64_t vtscsi_features; uint16_t vtscsi_flags; #define VTSCSI_FLAG_INDIRECT 0x0001 #define VTSCSI_FLAG_BIDIRECTIONAL 0x0002 #define VTSCSI_FLAG_HOTPLUG 0x0004 #define VTSCSI_FLAG_RESET 0x0008 #define VTSCSI_FLAG_DETACH 0x0010 uint16_t vtscsi_frozen; #define VTSCSI_FROZEN_NO_REQUESTS 0x01 #define VTSCSI_FROZEN_REQUEST_VQ_FULL 0x02 struct sglist *vtscsi_sglist; struct virtqueue *vtscsi_control_vq; struct virtqueue *vtscsi_event_vq; struct virtqueue *vtscsi_request_vq; struct cam_sim *vtscsi_sim; struct cam_path *vtscsi_path; int vtscsi_debug; int vtscsi_nrequests; int vtscsi_max_nsegs; int vtscsi_event_buf_size; TAILQ_HEAD(,vtscsi_request) vtscsi_req_free; uint16_t vtscsi_max_channel; uint16_t vtscsi_max_target; uint32_t vtscsi_max_lun; #define VTSCSI_NUM_EVENT_BUFS 4 struct virtio_scsi_event vtscsi_event_bufs[VTSCSI_NUM_EVENT_BUFS]; struct vtscsi_statistics vtscsi_stats; }; enum vtscsi_request_state { VTSCSI_REQ_STATE_FREE, VTSCSI_REQ_STATE_INUSE, VTSCSI_REQ_STATE_ABORTED, VTSCSI_REQ_STATE_TIMEDOUT }; struct vtscsi_request { struct vtscsi_softc *vsr_softc; union ccb *vsr_ccb; vtscsi_request_cb_t *vsr_complete; void *vsr_ptr0; /* Request when aborting a timedout command. */ #define vsr_timedout_req vsr_ptr0 enum vtscsi_request_state vsr_state; uint16_t vsr_flags; #define VTSCSI_REQ_FLAG_POLLED 0x01 #define VTSCSI_REQ_FLAG_COMPLETE 0x02 #define VTSCSI_REQ_FLAG_TIMEOUT_SET 0x04 union { struct virtio_scsi_cmd_req cmd; struct virtio_scsi_ctrl_tmf_req tmf; struct virtio_scsi_ctrl_an_req an; } vsr_ureq; #define vsr_cmd_req vsr_ureq.cmd #define vsr_tmf_req vsr_ureq.tmf #define vsr_an_req vsr_ureq.an /* Make request and response non-contiguous. */ uint32_t vsr_pad; union { struct virtio_scsi_cmd_resp cmd; struct virtio_scsi_ctrl_tmf_resp tmf; struct virtio_scsi_ctrl_an_resp an; } vsr_uresp; #define vsr_cmd_resp vsr_uresp.cmd #define vsr_tmf_resp vsr_uresp.tmf #define vsr_an_resp vsr_uresp.an struct callout vsr_callout; TAILQ_ENTRY(vtscsi_request) vsr_link; }; /* Private field in the CCB header that points to our request. */ #define ccbh_vtscsi_req spriv_ptr0 /* Features desired/implemented by this driver. */ #define VTSCSI_FEATURES \ (VIRTIO_SCSI_F_HOTPLUG | \ VIRTIO_RING_F_INDIRECT_DESC) #define VTSCSI_MTX(_sc) &(_sc)->vtscsi_mtx #define VTSCSI_LOCK_INIT(_sc, _name) lockinit(VTSCSI_MTX(_sc), \ "VTSCSI Lock", 0, LK_CANRECURSE) #define VTSCSI_LOCK(_sc) lockmgr(VTSCSI_MTX(_sc), LK_EXCLUSIVE) #define VTSCSI_UNLOCK(_sc) lockmgr(VTSCSI_MTX(_sc), LK_RELEASE) #define VTSCSI_LOCK_OWNED(_sc) KKASSERT(lockowned(VTSCSI_MTX(_sc)) != 0) #define VTSCSI_LOCK_NOTOWNED(_sc) KKASSERT(lockowned(VTSCSI_MTX(_sc)) == 0) #define VTSCSI_LOCK_DESTROY(_sc) lockuninit(VTSCSI_MTX(_sc)) /* * Reasons for either freezing or thawing the SIMQ. * * VirtIO SCSI is a bit unique in the sense that SCSI and TMF * commands go over different queues. Both queues are fed by * the same SIMQ, but we only freeze the SIMQ when the request * (SCSI) virtqueue is full, not caring if the control (TMF) * virtqueue unlikely gets full. However, both queues share the * same pool of requests, so the completion of a TMF command * could cause the SIMQ to be unfrozen. */ #define VTSCSI_REQUEST 0x01 #define VTSCSI_REQUEST_VQ 0x02 /* Debug trace levels. */ #define VTSCSI_INFO 0x01 #define VTSCSI_ERROR 0x02 #define VTSCSI_TRACE 0x04 #define vtscsi_dprintf(_sc, _level, _msg, _args ...) do { \ if ((_sc)->vtscsi_debug & (_level)) \ device_printf((_sc)->vtscsi_dev, "%s: "_msg, \ __FUNCTION__, ##_args); \ } while (0) #define vtscsi_dprintf_req(_req, _level, _msg, _args ...) do { \ struct vtscsi_softc *__sc = (_req)->vsr_softc; \ if ((__sc)->vtscsi_debug & (_level)) \ vtscsi_printf_req(_req, __FUNCTION__, _msg, ##_args); \ } while (0) /* * Set the status field in a CCB, optionally clearing non CCB_STATUS_* flags. */ #define vtscsi_set_ccb_status(_ccbh, _status, _mask) do { \ KASSERT(((_mask) & CAM_STATUS_MASK) == 0, \ ("%s:%d bad mask: 0x%x", __FUNCTION__, __LINE__, (_mask))); \ (_ccbh)->status &= ~(CAM_STATUS_MASK | (_mask)); \ (_ccbh)->status |= (_status); \ } while (0) /* * One segment each for the request and the response. */ #define VTSCSI_MIN_SEGMENTS 2 /* * Allocate additional requests for internal use such * as TM commands (e.g. aborting timedout commands). */ #define VTSCSI_RESERVED_REQUESTS 10 /* * Specification doesn't say, use traditional SCSI default. */ #define VTSCSI_INITIATOR_ID 7 /* * How to wait (or not) for request completion. */ #define VTSCSI_EXECUTE_ASYNC 0 #define VTSCSI_EXECUTE_POLL 1 #endif /* _VIRTIO_SCSIVAR_H */