adbf6af741
This bus does not really have a concept of the initiator ID, so use a guaranteed dummy one that won't conflict with any real target. This change fixes a problem with virtio_scsi on GCE where disks get sequential target IDs starting from one. If there are seven or more disks, then a disk with the target ID of seven would not be discovered by FreeBSD as that ID was reserved as the initiator ID -- see scsi_scan_bus(). Discussed with: bryanv MFC after: 2 weeks Sponsored by: Panzura
214 lines
6.3 KiB
C
214 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012, Bryan Venteicher <bryanv@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_SCSIVAR_H
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#define _VIRTIO_SCSIVAR_H
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struct vtscsi_softc;
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struct vtscsi_request;
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typedef void vtscsi_request_cb_t(struct vtscsi_softc *,
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struct vtscsi_request *);
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struct vtscsi_statistics {
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unsigned long scsi_cmd_timeouts;
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unsigned long dequeue_no_requests;
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};
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struct vtscsi_softc {
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device_t vtscsi_dev;
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struct mtx vtscsi_mtx;
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uint64_t vtscsi_features;
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uint16_t vtscsi_flags;
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#define VTSCSI_FLAG_INDIRECT 0x0001
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#define VTSCSI_FLAG_BIDIRECTIONAL 0x0002
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#define VTSCSI_FLAG_HOTPLUG 0x0004
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#define VTSCSI_FLAG_RESET 0x0008
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#define VTSCSI_FLAG_DETACH 0x0010
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uint16_t vtscsi_frozen;
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#define VTSCSI_FROZEN_NO_REQUESTS 0x01
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#define VTSCSI_FROZEN_REQUEST_VQ_FULL 0x02
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struct sglist *vtscsi_sglist;
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struct virtqueue *vtscsi_control_vq;
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struct virtqueue *vtscsi_event_vq;
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struct virtqueue *vtscsi_request_vq;
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struct cam_sim *vtscsi_sim;
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struct cam_path *vtscsi_path;
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int vtscsi_debug;
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int vtscsi_nrequests;
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int vtscsi_max_nsegs;
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int vtscsi_event_buf_size;
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TAILQ_HEAD(,vtscsi_request)
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vtscsi_req_free;
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uint16_t vtscsi_max_channel;
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uint16_t vtscsi_max_target;
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uint32_t vtscsi_max_lun;
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#define VTSCSI_NUM_EVENT_BUFS 4
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struct virtio_scsi_event
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vtscsi_event_bufs[VTSCSI_NUM_EVENT_BUFS];
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struct vtscsi_statistics vtscsi_stats;
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};
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enum vtscsi_request_state {
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VTSCSI_REQ_STATE_FREE,
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VTSCSI_REQ_STATE_INUSE,
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VTSCSI_REQ_STATE_ABORTED,
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VTSCSI_REQ_STATE_TIMEDOUT
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};
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struct vtscsi_request {
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struct vtscsi_softc *vsr_softc;
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union ccb *vsr_ccb;
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vtscsi_request_cb_t *vsr_complete;
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void *vsr_ptr0;
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/* Request when aborting a timedout command. */
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#define vsr_timedout_req vsr_ptr0
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enum vtscsi_request_state vsr_state;
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uint16_t vsr_flags;
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#define VTSCSI_REQ_FLAG_POLLED 0x01
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#define VTSCSI_REQ_FLAG_COMPLETE 0x02
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#define VTSCSI_REQ_FLAG_TIMEOUT_SET 0x04
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union {
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struct virtio_scsi_cmd_req cmd;
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struct virtio_scsi_ctrl_tmf_req tmf;
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struct virtio_scsi_ctrl_an_req an;
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} vsr_ureq;
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#define vsr_cmd_req vsr_ureq.cmd
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#define vsr_tmf_req vsr_ureq.tmf
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#define vsr_an_req vsr_ureq.an
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/* Make request and response non-contiguous. */
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uint32_t vsr_pad;
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union {
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struct virtio_scsi_cmd_resp cmd;
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struct virtio_scsi_ctrl_tmf_resp tmf;
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struct virtio_scsi_ctrl_an_resp an;
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} vsr_uresp;
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#define vsr_cmd_resp vsr_uresp.cmd
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#define vsr_tmf_resp vsr_uresp.tmf
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#define vsr_an_resp vsr_uresp.an
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struct callout vsr_callout;
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TAILQ_ENTRY(vtscsi_request) vsr_link;
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};
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/* Private field in the CCB header that points to our request. */
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#define ccbh_vtscsi_req spriv_ptr0
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/* Features desired/implemented by this driver. */
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#define VTSCSI_FEATURES \
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(VIRTIO_SCSI_F_HOTPLUG | \
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VIRTIO_RING_F_INDIRECT_DESC)
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#define VTSCSI_MTX(_sc) &(_sc)->vtscsi_mtx
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#define VTSCSI_LOCK_INIT(_sc, _name) mtx_init(VTSCSI_MTX(_sc), _name, \
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"VTSCSI Lock", MTX_DEF)
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#define VTSCSI_LOCK(_sc) mtx_lock(VTSCSI_MTX(_sc))
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#define VTSCSI_UNLOCK(_sc) mtx_unlock(VTSCSI_MTX(_sc))
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#define VTSCSI_LOCK_OWNED(_sc) mtx_assert(VTSCSI_MTX(_sc), MA_OWNED)
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#define VTSCSI_LOCK_NOTOWNED(_sc) mtx_assert(VTSCSI_MTX(_sc), MA_NOTOWNED)
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#define VTSCSI_LOCK_DESTROY(_sc) mtx_destroy(VTSCSI_MTX(_sc))
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/*
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* Reasons for either freezing or thawing the SIMQ.
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*
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* VirtIO SCSI is a bit unique in the sense that SCSI and TMF
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* commands go over different queues. Both queues are fed by
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* the same SIMQ, but we only freeze the SIMQ when the request
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* (SCSI) virtqueue is full, not caring if the control (TMF)
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* virtqueue unlikely gets full. However, both queues share the
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* same pool of requests, so the completion of a TMF command
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* could cause the SIMQ to be unfrozen.
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*/
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#define VTSCSI_REQUEST 0x01
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#define VTSCSI_REQUEST_VQ 0x02
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/* Debug trace levels. */
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#define VTSCSI_INFO 0x01
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#define VTSCSI_ERROR 0x02
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#define VTSCSI_TRACE 0x04
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#define vtscsi_dprintf(_sc, _level, _msg, _args ...) do { \
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if ((_sc)->vtscsi_debug & (_level)) \
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device_printf((_sc)->vtscsi_dev, "%s: "_msg, \
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__FUNCTION__, ##_args); \
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} while (0)
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#define vtscsi_dprintf_req(_req, _level, _msg, _args ...) do { \
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struct vtscsi_softc *__sc = (_req)->vsr_softc; \
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if ((__sc)->vtscsi_debug & (_level)) \
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vtscsi_printf_req(_req, __FUNCTION__, _msg, ##_args); \
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} while (0)
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/*
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* Set the status field in a CCB, optionally clearing non CCB_STATUS_* flags.
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*/
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#define vtscsi_set_ccb_status(_ccbh, _status, _mask) do { \
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KASSERT(((_mask) & CAM_STATUS_MASK) == 0, \
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("%s:%d bad mask: 0x%x", __FUNCTION__, __LINE__, (_mask))); \
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(_ccbh)->status &= ~(CAM_STATUS_MASK | (_mask)); \
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(_ccbh)->status |= (_status); \
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} while (0)
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/*
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* One segment each for the request and the response.
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*/
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#define VTSCSI_MIN_SEGMENTS 2
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/*
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* Allocate additional requests for internal use such
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* as TM commands (e.g. aborting timedout commands).
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*/
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#define VTSCSI_RESERVED_REQUESTS 10
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/*
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* How to wait (or not) for request completion.
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*/
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#define VTSCSI_EXECUTE_ASYNC 0
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#define VTSCSI_EXECUTE_POLL 1
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#endif /* _VIRTIO_SCSIVAR_H */
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