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/*-
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* Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.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: src/sys/dev/virtio/block/virtio_blk.c,v 1.4 2012/04/16 18:29:12 grehan Exp $
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*/
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/* Driver for VirtIO block devices. */
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bio.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/sglist.h>
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#include <sys/lock.h>
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#include <sys/queue.h>
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#include <sys/taskqueue.h>
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#include <sys/buf2.h>
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#include <sys/rman.h>
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#include <sys/disk.h>
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#include <sys/spinlock.h>
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#include <sys/spinlock2.h>
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#include <sys/devicestat.h>
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#include <dev/virtual/virtio/virtio/virtio.h>
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#include <dev/virtual/virtio/virtio/virtqueue.h>
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#include "virtio_blk.h"
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struct vtblk_request {
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struct virtio_blk_outhdr vbr_hdr;
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struct bio *vbr_bp;
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uint8_t vbr_ack;
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TAILQ_ENTRY(vtblk_request) vbr_link;
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};
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struct vtblk_softc {
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device_t vtblk_dev;
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struct spinlock vtblk_mtx;
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uint64_t vtblk_features;
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#define VTBLK_FLAG_READONLY 0x0002
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#define VTBLK_FLAG_DETACH 0x0004
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#define VTBLK_FLAG_SUSPEND 0x0008
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#define VTBLK_FLAG_DUMPING 0x0010
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uint32_t vtblk_flags;
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struct virtqueue *vtblk_vq;
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struct sglist *vtblk_sglist;
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struct disk vtblk_disk;
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cdev_t cdev;
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struct devstat stats;
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struct bio_queue_head vtblk_bioq;
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TAILQ_HEAD(, vtblk_request) vtblk_req_free;
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TAILQ_HEAD(, vtblk_request) vtblk_req_ready;
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struct task vtblk_intr_task;
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int vtblk_sector_size;
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int vtblk_max_nsegs;
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int vtblk_unit;
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int vtblk_request_count;
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struct vtblk_request vtblk_dump_request;
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};
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static struct virtio_feature_desc vtblk_feature_desc[] = {
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{ VIRTIO_BLK_F_BARRIER, "HostBarrier" },
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{ VIRTIO_BLK_F_SIZE_MAX, "MaxSegSize" },
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{ VIRTIO_BLK_F_SEG_MAX, "MaxNumSegs" },
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{ VIRTIO_BLK_F_GEOMETRY, "DiskGeometry" },
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{ VIRTIO_BLK_F_RO, "ReadOnly" },
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{ VIRTIO_BLK_F_BLK_SIZE, "BlockSize" },
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{ VIRTIO_BLK_F_SCSI, "SCSICmds" },
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{ VIRTIO_BLK_F_FLUSH, "FlushCmd" },
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{ VIRTIO_BLK_F_TOPOLOGY, "Topology" },
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{ 0, NULL }
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};
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static int vtblk_modevent(module_t, int, void *);
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static int vtblk_probe(device_t);
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static int vtblk_attach(device_t);
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static int vtblk_detach(device_t);
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static int vtblk_suspend(device_t);
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static int vtblk_resume(device_t);
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static int vtblk_shutdown(device_t);
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static void vtblk_negotiate_features(struct vtblk_softc *);
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static int vtblk_maximum_segments(struct vtblk_softc *,
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struct virtio_blk_config *);
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static int vtblk_alloc_virtqueue(struct vtblk_softc *);
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static void vtblk_alloc_disk(struct vtblk_softc *,
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struct virtio_blk_config *);
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/*
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* Interface to the device switch.
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*/
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static d_open_t vtblk_open;
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static d_strategy_t vtblk_strategy;
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static d_dump_t vtblk_dump;
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static struct dev_ops vbd_disk_ops = {
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{ "vbd", 200, D_DISK | D_MPSAFE },
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.d_open = vtblk_open,
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.d_close = nullclose,
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.d_read = physread,
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.d_write = physwrite,
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.d_strategy = vtblk_strategy,
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.d_dump = vtblk_dump,
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};
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static void vtblk_startio(struct vtblk_softc *);
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static struct vtblk_request *vtblk_bio_request(struct vtblk_softc *);
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static int vtblk_execute_request(struct vtblk_softc *,
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struct vtblk_request *);
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static int vtblk_vq_intr(void *);
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static void vtblk_complete(void *, int);
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static void vtblk_stop(struct vtblk_softc *);
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static void vtblk_prepare_dump(struct vtblk_softc *);
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static int vtblk_write_dump(struct vtblk_softc *, void *, off_t, size_t);
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static int vtblk_flush_dump(struct vtblk_softc *);
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static int vtblk_poll_request(struct vtblk_softc *,
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struct vtblk_request *);
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static void vtblk_drain_vq(struct vtblk_softc *, int);
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static void vtblk_drain(struct vtblk_softc *);
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static int vtblk_alloc_requests(struct vtblk_softc *);
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static void vtblk_free_requests(struct vtblk_softc *);
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static struct vtblk_request *vtblk_dequeue_request(struct vtblk_softc *);
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static void vtblk_enqueue_request(struct vtblk_softc *,
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struct vtblk_request *);
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static struct vtblk_request *vtblk_dequeue_ready(struct vtblk_softc *);
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static void vtblk_enqueue_ready(struct vtblk_softc *,
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struct vtblk_request *);
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static void vtblk_bio_error(struct bio *, int);
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/* Tunables. */
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static int vtblk_no_ident = 0;
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TUNABLE_INT("hw.vtblk.no_ident", &vtblk_no_ident);
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/* Features desired/implemented by this driver. */
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#define VTBLK_FEATURES \
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(VIRTIO_BLK_F_BARRIER | \
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VIRTIO_BLK_F_SIZE_MAX | \
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VIRTIO_BLK_F_SEG_MAX | \
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VIRTIO_BLK_F_GEOMETRY | \
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VIRTIO_BLK_F_RO | \
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VIRTIO_BLK_F_BLK_SIZE | \
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VIRTIO_BLK_F_FLUSH)
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#define VTBLK_MTX(_sc) &(_sc)->vtblk_mtx
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#define VTBLK_LOCK_INIT(_sc) spin_init(&(_sc)->vtblk_mtx)
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#define VTBLK_LOCK(_sc) spin_lock(VTBLK_MTX((_sc)))
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#define VTBLK_TRYLOCK(_sc) spin_trylock(VTBLK_MTX((_sc)))
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#define VTBLK_UNLOCK(_sc) spin_unlock(VTBLK_MTX((_sc)))
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#define VTBLK_LOCK_DESTROY(_sc) spin_uninit(VTBLK_MTX((_sc)))
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#define VTBLK_LOCK_ASSERT(_sc)
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#define VTBLK_LOCK_ASSERT_NOTOWNED(_sc)
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/*
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* Each block request uses at least two segments - one for the header
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* and one for the status.
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*/
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#define VTBLK_MIN_SEGMENTS 2
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static device_method_t vtblk_methods[] = {
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/* Device methods. */
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DEVMETHOD(device_probe, vtblk_probe),
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DEVMETHOD(device_attach, vtblk_attach),
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DEVMETHOD(device_detach, vtblk_detach),
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DEVMETHOD(device_suspend, vtblk_suspend),
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DEVMETHOD(device_resume, vtblk_resume),
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DEVMETHOD(device_shutdown, vtblk_shutdown),
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{ 0, 0 }
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};
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static driver_t vtblk_driver = {
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"vtblk",
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vtblk_methods,
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sizeof(struct vtblk_softc)
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};
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static devclass_t vtblk_devclass;
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DRIVER_MODULE(virtio_blk, virtio_pci, vtblk_driver, vtblk_devclass,
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vtblk_modevent, NULL);
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MODULE_VERSION(virtio_blk, 1);
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MODULE_DEPEND(virtio_blk, virtio, 1, 1, 1);
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224 |
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static int
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vtblk_modevent(module_t mod, int type, void *unused)
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{
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int error;
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error = 0;
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switch (type) {
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case MOD_LOAD:
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break;
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case MOD_UNLOAD:
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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static int
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vtblk_probe(device_t dev)
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{
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if (virtio_get_device_type(dev) != VIRTIO_ID_BLOCK)
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return (ENXIO);
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device_set_desc(dev, "VirtIO Block Adapter");
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return (BUS_PROBE_DEFAULT);
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}
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258 |
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static int
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vtblk_attach(device_t dev)
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{
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struct vtblk_softc *sc;
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struct virtio_blk_config blkcfg;
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int error;
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sc = device_get_softc(dev);
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sc->vtblk_dev = dev;
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sc->vtblk_unit = device_get_unit(dev);
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269 |
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VTBLK_LOCK_INIT(sc);
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271 |
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272 |
bioq_init(&sc->vtblk_bioq);
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TAILQ_INIT(&sc->vtblk_req_free);
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TAILQ_INIT(&sc->vtblk_req_ready);
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275 |
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virtio_set_feature_desc(dev, vtblk_feature_desc);
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vtblk_negotiate_features(sc);
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278 |
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if (virtio_with_feature(dev, VIRTIO_BLK_F_RO))
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sc->vtblk_flags |= VTBLK_FLAG_READONLY;
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281 |
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/* Get local copy of config. */
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virtio_read_device_config(dev, 0, &blkcfg,
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sizeof(struct virtio_blk_config));
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285 |
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286 |
/*
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* With the current sglist(9) implementation, it is not easy
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288 |
* for us to support a maximum segment size as adjacent
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289 |
* segments are coalesced. For now, just make sure it's larger
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290 |
* than the maximum supported transfer size.
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291 |
*/
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292 |
if (virtio_with_feature(dev, VIRTIO_BLK_F_SIZE_MAX)) {
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293 |
if (blkcfg.size_max < MAXPHYS) {
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error = ENOTSUP;
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295 |
device_printf(dev, "host requires unsupported "
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296 |
"maximum segment size feature\n");
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297 |
goto fail;
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298 |
}
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299 |
}
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300 |
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301 |
sc->vtblk_max_nsegs = vtblk_maximum_segments(sc, &blkcfg);
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302 |
if (sc->vtblk_max_nsegs <= VTBLK_MIN_SEGMENTS) {
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error = EINVAL;
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304 |
device_printf(dev, "fewer than minimum number of segments "
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"allowed: %d\n", sc->vtblk_max_nsegs);
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306 |
goto fail;
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307 |
}
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308 |
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309 |
/*
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310 |
* Allocate working sglist. The number of segments may be too
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311 |
* large to safely store on the stack.
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312 |
*/
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313 |
sc->vtblk_sglist = sglist_alloc(sc->vtblk_max_nsegs, M_NOWAIT);
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314 |
if (sc->vtblk_sglist == NULL) {
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315 |
error = ENOMEM;
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316 |
device_printf(dev, "cannot allocate sglist\n");
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317 |
goto fail;
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318 |
}
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319 |
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320 |
error = vtblk_alloc_virtqueue(sc);
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321 |
if (error) {
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322 |
device_printf(dev, "cannot allocate virtqueue\n");
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323 |
goto fail;
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324 |
}
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325 |
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326 |
error = vtblk_alloc_requests(sc);
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327 |
if (error) {
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328 |
device_printf(dev, "cannot preallocate requests\n");
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329 |
goto fail;
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330 |
}
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331 |
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332 |
vtblk_alloc_disk(sc, &blkcfg);
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333 |
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334 |
TASK_INIT(&sc->vtblk_intr_task, 0, vtblk_complete, sc);
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335 |
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336 |
error = virtio_setup_intr(dev);
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337 |
if (error) {
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338 |
device_printf(dev, "cannot setup virtqueue interrupt\n");
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339 |
goto fail;
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340 |
}
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341 |
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342 |
virtqueue_enable_intr(sc->vtblk_vq);
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343 |
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344 |
fail:
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345 |
if (error)
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346 |
vtblk_detach(dev);
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347 |
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348 |
return (error);
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349 |
}
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350 |
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|
351 |
static int
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352 |
vtblk_detach(device_t dev)
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353 |
{
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354 |
struct vtblk_softc *sc;
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355 |
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356 |
sc = device_get_softc(dev);
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357 |
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358 |
VTBLK_LOCK(sc);
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359 |
sc->vtblk_flags |= VTBLK_FLAG_DETACH;
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360 |
if (device_is_attached(dev))
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361 |
vtblk_stop(sc);
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362 |
VTBLK_UNLOCK(sc);
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363 |
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364 |
taskqueue_drain(taskqueue_thread[mycpuid], &sc->vtblk_intr_task);
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365 |
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366 |
vtblk_drain(sc);
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367 |
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368 |
if (sc->vtblk_sglist != NULL) {
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369 |
sglist_free(sc->vtblk_sglist);
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370 |
sc->vtblk_sglist = NULL;
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|
371 |
}
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|
372 |
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|
373 |
VTBLK_LOCK_DESTROY(sc);
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|
374 |
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|
375 |
return (0);
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|
376 |
}
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|
377 |
|
|
378 |
static int
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|
379 |
vtblk_suspend(device_t dev)
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|
380 |
{
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|
381 |
struct vtblk_softc *sc;
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|
382 |
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|
383 |
sc = device_get_softc(dev);
|
|
384 |
|
|
385 |
VTBLK_LOCK(sc);
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|
386 |
sc->vtblk_flags |= VTBLK_FLAG_SUSPEND;
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|
387 |
/* TODO Wait for any inflight IO to complete? */
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|
388 |
VTBLK_UNLOCK(sc);
|
|
389 |
|
|
390 |
return (0);
|
|
391 |
}
|
|
392 |
|
|
393 |
static int
|
|
394 |
vtblk_resume(device_t dev)
|
|
395 |
{
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|
396 |
struct vtblk_softc *sc;
|
|
397 |
|
|
398 |
sc = device_get_softc(dev);
|
|
399 |
|
|
400 |
VTBLK_LOCK(sc);
|
|
401 |
sc->vtblk_flags &= ~VTBLK_FLAG_SUSPEND;
|
|
402 |
/* TODO Resume IO? */
|
|
403 |
VTBLK_UNLOCK(sc);
|
|
404 |
|
|
405 |
return (0);
|
|
406 |
}
|
|
407 |
|
|
408 |
static int
|
|
409 |
vtblk_shutdown(device_t dev)
|
|
410 |
{
|
|
411 |
return (0);
|
|
412 |
}
|
|
413 |
|
|
414 |
static int
|
|
415 |
vtblk_open(struct dev_open_args *ap)
|
|
416 |
{
|
|
417 |
struct vtblk_softc *sc;
|
|
418 |
cdev_t dev = ap->a_head.a_dev;
|
|
419 |
sc = dev->si_drv1;
|
|
420 |
if (sc == NULL)
|
|
421 |
return (ENXIO);
|
|
422 |
|
|
423 |
return (sc->vtblk_flags & VTBLK_FLAG_DETACH ? ENXIO : 0);
|
|
424 |
}
|
|
425 |
|
|
426 |
static int
|
|
427 |
vtblk_dump(struct dev_dump_args *ap)
|
|
428 |
{
|
|
429 |
struct vtblk_softc *sc;
|
|
430 |
int error;
|
|
431 |
|
|
432 |
error = 0;
|
|
433 |
|
|
434 |
cdev_t dev = ap->a_head.a_dev;
|
|
435 |
sc = dev->si_drv1;
|
|
436 |
|
|
437 |
if (sc == NULL)
|
|
438 |
return (ENXIO);
|
|
439 |
|
|
440 |
if (VTBLK_TRYLOCK(sc) == 0) {
|
|
441 |
device_printf(sc->vtblk_dev,
|
|
442 |
"softc already locked, cannot dump...\n");
|
|
443 |
return (EBUSY);
|
|
444 |
}
|
|
445 |
|
|
446 |
if ((sc->vtblk_flags & VTBLK_FLAG_DUMPING) == 0) {
|
|
447 |
vtblk_prepare_dump(sc);
|
|
448 |
sc->vtblk_flags |= VTBLK_FLAG_DUMPING;
|
|
449 |
}
|
|
450 |
|
|
451 |
if (ap->a_length > 0) {
|
|
452 |
error = vtblk_write_dump(sc, ap->a_virtual, ap->a_offset,
|
|
453 |
ap->a_length);
|
|
454 |
} else if (ap->a_virtual == NULL && ap->a_offset == 0) {
|
|
455 |
error = vtblk_flush_dump(sc);
|
|
456 |
}
|
|
457 |
|
|
458 |
VTBLK_UNLOCK(sc);
|
|
459 |
|
|
460 |
return (error);
|
|
461 |
}
|
|
462 |
|
|
463 |
static int
|
|
464 |
vtblk_strategy(struct dev_strategy_args *ap)
|
|
465 |
{
|
|
466 |
struct vtblk_softc *sc;
|
|
467 |
cdev_t dev = ap->a_head.a_dev;
|
|
468 |
sc = dev->si_drv1;
|
|
469 |
struct bio *bio = ap->a_bio;
|
|
470 |
struct buf *bp = bio->bio_buf;
|
|
471 |
|
|
472 |
if (sc == NULL) {
|
|
473 |
vtblk_bio_error(bio, EINVAL);
|
|
474 |
return EINVAL;
|
|
475 |
}
|
|
476 |
|
|
477 |
/*
|
|
478 |
* Fail any write if RO. Unfortunately, there does not seem to
|
|
479 |
* be a better way to report our readonly'ness to GEOM above.
|
|
480 |
*
|
|
481 |
* XXX: Is that true in DFly?
|
|
482 |
*/
|
|
483 |
if (sc->vtblk_flags & VTBLK_FLAG_READONLY &&
|
|
484 |
(bp->b_cmd == BUF_CMD_READ || bp->b_cmd == BUF_CMD_FLUSH)) {
|
|
485 |
vtblk_bio_error(bio, EROFS);
|
|
486 |
return (EINVAL);
|
|
487 |
}
|
|
488 |
|
|
489 |
VTBLK_LOCK(sc);
|
|
490 |
if ((sc->vtblk_flags & VTBLK_FLAG_DETACH) == 0) {
|
|
491 |
devstat_start_transaction(&sc->stats);
|
|
492 |
bioqdisksort(&sc->vtblk_bioq, bio);
|
|
493 |
vtblk_startio(sc);
|
|
494 |
} else {
|
|
495 |
vtblk_bio_error(bio, ENXIO);
|
|
496 |
}
|
|
497 |
VTBLK_UNLOCK(sc);
|
|
498 |
return 0;
|
|
499 |
}
|
|
500 |
|
|
501 |
static void
|
|
502 |
vtblk_negotiate_features(struct vtblk_softc *sc)
|
|
503 |
{
|
|
504 |
device_t dev;
|
|
505 |
uint64_t features;
|
|
506 |
|
|
507 |
dev = sc->vtblk_dev;
|
|
508 |
features = VTBLK_FEATURES;
|
|
509 |
|
|
510 |
sc->vtblk_features = virtio_negotiate_features(dev, features);
|
|
511 |
}
|
|
512 |
|
|
513 |
static int
|
|
514 |
vtblk_maximum_segments(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
|
|
515 |
{
|
|
516 |
device_t dev;
|
|
517 |
int nsegs;
|
|
518 |
|
|
519 |
dev = sc->vtblk_dev;
|
|
520 |
nsegs = VTBLK_MIN_SEGMENTS;
|
|
521 |
|
|
522 |
if (virtio_with_feature(dev, VIRTIO_BLK_F_SEG_MAX)) {
|
|
523 |
nsegs += MIN(blkcfg->seg_max, MAXPHYS / PAGE_SIZE + 1);
|
|
524 |
} else {
|
|
525 |
nsegs += 1;
|
|
526 |
}
|
|
527 |
|
|
528 |
return (nsegs);
|
|
529 |
}
|
|
530 |
|
|
531 |
static int
|
|
532 |
vtblk_alloc_virtqueue(struct vtblk_softc *sc)
|
|
533 |
{
|
|
534 |
device_t dev;
|
|
535 |
struct vq_alloc_info vq_info;
|
|
536 |
|
|
537 |
dev = sc->vtblk_dev;
|
|
538 |
|
|
539 |
VQ_ALLOC_INFO_INIT(&vq_info, sc->vtblk_max_nsegs,
|
|
540 |
vtblk_vq_intr, sc, &sc->vtblk_vq,
|
|
541 |
"%s request", device_get_nameunit(dev));
|
|
542 |
|
|
543 |
return (virtio_alloc_virtqueues(dev, 0, 1, &vq_info));
|
|
544 |
}
|
|
545 |
|
|
546 |
static void
|
|
547 |
vtblk_alloc_disk(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
|
|
548 |
{
|
|
549 |
|
|
550 |
struct disk_info info;
|
|
551 |
|
|
552 |
/* construct the disk_info */
|
|
553 |
bzero(&info, sizeof(info));
|
|
554 |
|
|
555 |
if (virtio_with_feature(sc->vtblk_dev, VIRTIO_BLK_F_BLK_SIZE))
|
|
556 |
sc->vtblk_sector_size = blkcfg->blk_size;
|
|
557 |
else
|
|
558 |
sc->vtblk_sector_size = DEV_BSIZE;
|
|
559 |
|
|
560 |
info.d_media_blksize = sc->vtblk_sector_size;
|
|
561 |
info.d_media_blocks = blkcfg->capacity;
|
|
562 |
|
|
563 |
info.d_ncylinders = blkcfg->geometry.cylinders;
|
|
564 |
info.d_nheads = blkcfg->geometry.heads;
|
|
565 |
info.d_secpertrack = blkcfg->geometry.sectors;
|
|
566 |
|
|
567 |
info.d_secpercyl = info.d_secpertrack * info.d_nheads;
|
|
568 |
|
|
569 |
devstat_add_entry(&sc->stats, "vbd", device_get_unit(sc->vtblk_dev),
|
|
570 |
DEV_BSIZE, DEVSTAT_ALL_SUPPORTED,
|
|
571 |
DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
|
|
572 |
DEVSTAT_PRIORITY_DISK);
|
|
573 |
|
|
574 |
/* attach a generic disk device to ourselves */
|
|
575 |
sc->cdev = disk_create(device_get_unit(sc->vtblk_dev), &sc->vtblk_disk,
|
|
576 |
&vbd_disk_ops);
|
|
577 |
|
|
578 |
sc->cdev->si_drv1 = sc;
|
|
579 |
disk_setdiskinfo(&sc->vtblk_disk, &info);
|
|
580 |
}
|
|
581 |
|
|
582 |
static void
|
|
583 |
vtblk_startio(struct vtblk_softc *sc)
|
|
584 |
{
|
|
585 |
struct virtqueue *vq;
|
|
586 |
struct vtblk_request *req;
|
|
587 |
int enq;
|
|
588 |
|
|
589 |
vq = sc->vtblk_vq;
|
|
590 |
enq = 0;
|
|
591 |
|
|
592 |
VTBLK_LOCK_ASSERT(sc);
|
|
593 |
|
|
594 |
if (sc->vtblk_flags & VTBLK_FLAG_SUSPEND)
|
|
595 |
return;
|
|
596 |
|
|
597 |
while (!virtqueue_full(vq)) {
|
|
598 |
if ((req = vtblk_dequeue_ready(sc)) == NULL)
|
|
599 |
req = vtblk_bio_request(sc);
|
|
600 |
if (req == NULL)
|
|
601 |
break;
|
|
602 |
|
|
603 |
if (vtblk_execute_request(sc, req) != 0) {
|
|
604 |
vtblk_enqueue_ready(sc, req);
|
|
605 |
break;
|
|
606 |
}
|
|
607 |
|
|
608 |
enq++;
|
|
609 |
}
|
|
610 |
|
|
611 |
if (enq > 0)
|
|
612 |
virtqueue_notify(vq, &sc->vtblk_mtx);
|
|
613 |
}
|
|
614 |
|
|
615 |
static struct vtblk_request *
|
|
616 |
vtblk_bio_request(struct vtblk_softc *sc)
|
|
617 |
{
|
|
618 |
struct bio_queue_head *bioq;
|
|
619 |
struct vtblk_request *req;
|
|
620 |
struct bio *bio;
|
|
621 |
struct buf *bp;
|
|
622 |
|
|
623 |
bioq = &sc->vtblk_bioq;
|
|
624 |
|
|
625 |
if (bioq_first(bioq) == NULL)
|
|
626 |
return (NULL);
|
|
627 |
|
|
628 |
req = vtblk_dequeue_request(sc);
|
|
629 |
if (req == NULL)
|
|
630 |
return (NULL);
|
|
631 |
|
|
632 |
bio = bioq_takefirst(bioq);
|
|
633 |
req->vbr_bp = bio;
|
|
634 |
req->vbr_ack = -1;
|
|
635 |
req->vbr_hdr.ioprio = 1;
|
|
636 |
bp = bio->bio_buf;
|
|
637 |
|
|
638 |
switch (bp->b_cmd) {
|
|
639 |
case BUF_CMD_FLUSH:
|
|
640 |
req->vbr_hdr.type = VIRTIO_BLK_T_FLUSH;
|
|
641 |
break;
|
|
642 |
case BUF_CMD_READ:
|
|
643 |
req->vbr_hdr.type = VIRTIO_BLK_T_IN;
|
|
644 |
req->vbr_hdr.sector = bio->bio_offset / DEV_BSIZE;
|
|
645 |
break;
|
|
646 |
case BUF_CMD_WRITE:
|
|
647 |
req->vbr_hdr.type = VIRTIO_BLK_T_OUT;
|
|
648 |
req->vbr_hdr.sector = bio->bio_offset / DEV_BSIZE;
|
|
649 |
break;
|
|
650 |
default:
|
|
651 |
KASSERT(0, ("bio with unhandled cmd: %d", bp->b_cmd));
|
|
652 |
req->vbr_hdr.type = -1;
|
|
653 |
break;
|
|
654 |
}
|
|
655 |
|
|
656 |
if (bp->b_flags & B_ORDERED)
|
|
657 |
req->vbr_hdr.type |= VIRTIO_BLK_T_BARRIER;
|
|
658 |
|
|
659 |
return (req);
|
|
660 |
}
|
|
661 |
|
|
662 |
static int
|
|
663 |
vtblk_execute_request(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
664 |
{
|
|
665 |
struct sglist *sg;
|
|
666 |
struct bio *bio;
|
|
667 |
struct buf *bp;
|
|
668 |
int writable, error;
|
|
669 |
|
|
670 |
sg = sc->vtblk_sglist;
|
|
671 |
bio = req->vbr_bp;
|
|
672 |
bp = bio->bio_buf;
|
|
673 |
writable = 0;
|
|
674 |
|
|
675 |
/*
|
|
676 |
* sglist is live throughout this subroutine.
|
|
677 |
*/
|
|
678 |
sglist_reset(sg);
|
|
679 |
|
|
680 |
error = sglist_append(sg, &req->vbr_hdr,
|
|
681 |
sizeof(struct virtio_blk_outhdr));
|
|
682 |
KASSERT(error == 0, ("error adding header to sglist"));
|
|
683 |
KASSERT(sg->sg_nseg == 1,
|
|
684 |
("header spanned multiple segments: %d", sg->sg_nseg));
|
|
685 |
|
|
686 |
if (bp->b_cmd == BUF_CMD_READ || bp->b_cmd == BUF_CMD_WRITE) {
|
|
687 |
error = sglist_append(sg, bp->b_data, bp->b_bcount);
|
|
688 |
KASSERT(error == 0, ("error adding buffer to sglist"));
|
|
689 |
|
|
690 |
/* BUF_CMD_READ means the host writes into our buffer. */
|
|
691 |
if (bp->b_cmd == BUF_CMD_READ)
|
|
692 |
writable += sg->sg_nseg - 1;
|
|
693 |
}
|
|
694 |
|
|
695 |
error = sglist_append(sg, &req->vbr_ack, sizeof(uint8_t));
|
|
696 |
KASSERT(error == 0, ("error adding ack to sglist"));
|
|
697 |
writable++;
|
|
698 |
|
|
699 |
KASSERT(sg->sg_nseg >= VTBLK_MIN_SEGMENTS,
|
|
700 |
("fewer than min segments: %d", sg->sg_nseg));
|
|
701 |
|
|
702 |
error = virtqueue_enqueue(sc->vtblk_vq, req, sg,
|
|
703 |
sg->sg_nseg - writable, writable);
|
|
704 |
|
|
705 |
sglist_reset(sg);
|
|
706 |
|
|
707 |
return (error);
|
|
708 |
}
|
|
709 |
|
|
710 |
static int
|
|
711 |
vtblk_vq_intr(void *xsc)
|
|
712 |
{
|
|
713 |
struct vtblk_softc *sc;
|
|
714 |
|
|
715 |
sc = xsc;
|
|
716 |
|
|
717 |
virtqueue_disable_intr(sc->vtblk_vq);
|
|
718 |
taskqueue_enqueue(taskqueue_thread[mycpuid], &sc->vtblk_intr_task);
|
|
719 |
|
|
720 |
return (1);
|
|
721 |
}
|
|
722 |
|
|
723 |
static void
|
|
724 |
vtblk_complete(void *arg, int pending)
|
|
725 |
{
|
|
726 |
struct vtblk_softc *sc;
|
|
727 |
struct vtblk_request *req;
|
|
728 |
struct virtqueue *vq;
|
|
729 |
struct bio *bio;
|
|
730 |
struct buf *bp;
|
|
731 |
|
|
732 |
sc = arg;
|
|
733 |
vq = sc->vtblk_vq;
|
|
734 |
|
|
735 |
retry:
|
|
736 |
VTBLK_LOCK(sc);
|
|
737 |
if (sc->vtblk_flags & VTBLK_FLAG_DETACH) {
|
|
738 |
VTBLK_UNLOCK(sc);
|
|
739 |
return;
|
|
740 |
}
|
|
741 |
|
|
742 |
while ((req = virtqueue_dequeue(vq, NULL)) != NULL) {
|
|
743 |
bio = req->vbr_bp;
|
|
744 |
bp = bio->bio_buf;
|
|
745 |
|
|
746 |
if (req->vbr_ack == VIRTIO_BLK_S_OK)
|
|
747 |
bp->b_resid = 0;
|
|
748 |
else {
|
|
749 |
bp->b_flags |= B_ERROR;
|
|
750 |
if (req->vbr_ack == VIRTIO_BLK_S_UNSUPP) {
|
|
751 |
bp->b_error = ENOTSUP;
|
|
752 |
} else {
|
|
753 |
bp->b_error = EIO;
|
|
754 |
}
|
|
755 |
}
|
|
756 |
|
|
757 |
devstat_end_transaction_buf(&sc->stats, bio->bio_buf);
|
|
758 |
|
|
759 |
VTBLK_UNLOCK(sc);
|
|
760 |
/*
|
|
761 |
* Unlocking the controller around biodone() does not allow
|
|
762 |
* processing further device interrupts; when we queued
|
|
763 |
* vtblk_intr_task, we disabled interrupts. It will allow
|
|
764 |
* concurrent vtblk_strategy/_startio command dispatches.
|
|
765 |
*/
|
|
766 |
biodone(bio);
|
|
767 |
VTBLK_LOCK(sc);
|
|
768 |
|
|
769 |
vtblk_enqueue_request(sc, req);
|
|
770 |
}
|
|
771 |
|
|
772 |
vtblk_startio(sc);
|
|
773 |
|
|
774 |
if (virtqueue_enable_intr(vq) != 0) {
|
|
775 |
/*
|
|
776 |
* If new virtqueue entries appeared immediately after
|
|
777 |
* enabling interrupts, process them now. Release and
|
|
778 |
* retake softcontroller lock to try to avoid blocking
|
|
779 |
* I/O dispatch for too long.
|
|
780 |
*/
|
|
781 |
virtqueue_disable_intr(vq);
|
|
782 |
VTBLK_UNLOCK(sc);
|
|
783 |
goto retry;
|
|
784 |
}
|
|
785 |
|
|
786 |
VTBLK_UNLOCK(sc);
|
|
787 |
}
|
|
788 |
|
|
789 |
static void
|
|
790 |
vtblk_stop(struct vtblk_softc *sc)
|
|
791 |
{
|
|
792 |
virtqueue_disable_intr(sc->vtblk_vq);
|
|
793 |
virtio_stop(sc->vtblk_dev);
|
|
794 |
}
|
|
795 |
|
|
796 |
static void
|
|
797 |
vtblk_prepare_dump(struct vtblk_softc *sc)
|
|
798 |
{
|
|
799 |
device_t dev;
|
|
800 |
struct virtqueue *vq;
|
|
801 |
|
|
802 |
dev = sc->vtblk_dev;
|
|
803 |
vq = sc->vtblk_vq;
|
|
804 |
|
|
805 |
vtblk_stop(sc);
|
|
806 |
|
|
807 |
/*
|
|
808 |
* Drain all requests caught in-flight in the virtqueue,
|
|
809 |
* skipping biodone(). When dumping, only one request is
|
|
810 |
* outstanding at a time, and we just poll the virtqueue
|
|
811 |
* for the response.
|
|
812 |
*/
|
|
813 |
vtblk_drain_vq(sc, 1);
|
|
814 |
|
|
815 |
if (virtio_reinit(dev, sc->vtblk_features) != 0)
|
|
816 |
panic("cannot reinit VirtIO block device during dump");
|
|
817 |
|
|
818 |
virtqueue_disable_intr(vq);
|
|
819 |
virtio_reinit_complete(dev);
|
|
820 |
}
|
|
821 |
|
|
822 |
static int
|
|
823 |
vtblk_write_dump(struct vtblk_softc *sc, void *virtual, off_t offset,
|
|
824 |
size_t length)
|
|
825 |
{
|
|
826 |
struct bio bio;
|
|
827 |
struct vtblk_request *req;
|
|
828 |
struct buf *bp;
|
|
829 |
|
|
830 |
req = &sc->vtblk_dump_request;
|
|
831 |
req->vbr_ack = -1;
|
|
832 |
req->vbr_hdr.type = VIRTIO_BLK_T_OUT;
|
|
833 |
req->vbr_hdr.ioprio = 1;
|
|
834 |
req->vbr_hdr.sector = offset / DEV_BSIZE;
|
|
835 |
|
|
836 |
req->vbr_bp = &bio;
|
|
837 |
bzero(&buf, sizeof(struct bio));
|
|
838 |
bp = bio.bio_buf;
|
|
839 |
|
|
840 |
bp->b_cmd = BUF_CMD_WRITE;
|
|
841 |
bp->b_data = virtual;
|
|
842 |
bp->b_bcount = length;
|
|
843 |
|
|
844 |
return (vtblk_poll_request(sc, req));
|
|
845 |
}
|
|
846 |
|
|
847 |
static int
|
|
848 |
vtblk_flush_dump(struct vtblk_softc *sc)
|
|
849 |
{
|
|
850 |
struct bio bio;
|
|
851 |
struct vtblk_request *req;
|
|
852 |
struct buf *bp;
|
|
853 |
|
|
854 |
req = &sc->vtblk_dump_request;
|
|
855 |
req->vbr_ack = -1;
|
|
856 |
req->vbr_hdr.type = VIRTIO_BLK_T_FLUSH;
|
|
857 |
req->vbr_hdr.ioprio = 1;
|
|
858 |
req->vbr_hdr.sector = 0;
|
|
859 |
|
|
860 |
req->vbr_bp = &bio;
|
|
861 |
bzero(&buf, sizeof(struct bio));
|
|
862 |
bp = bio.bio_buf;
|
|
863 |
|
|
864 |
bp->b_cmd = BUF_CMD_FLUSH;
|
|
865 |
|
|
866 |
return (vtblk_poll_request(sc, req));
|
|
867 |
}
|
|
868 |
|
|
869 |
static int
|
|
870 |
vtblk_poll_request(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
871 |
{
|
|
872 |
device_t dev;
|
|
873 |
struct virtqueue *vq;
|
|
874 |
struct vtblk_request *r __debugvar;
|
|
875 |
int error;
|
|
876 |
|
|
877 |
dev = sc->vtblk_dev;
|
|
878 |
vq = sc->vtblk_vq;
|
|
879 |
|
|
880 |
if (!virtqueue_empty(vq))
|
|
881 |
return (EBUSY);
|
|
882 |
|
|
883 |
error = vtblk_execute_request(sc, req);
|
|
884 |
if (error)
|
|
885 |
return (error);
|
|
886 |
|
|
887 |
virtqueue_notify(vq, &sc->vtblk_mtx);
|
|
888 |
|
|
889 |
r = virtqueue_poll(vq, NULL);
|
|
890 |
KASSERT(r == req, ("unexpected request response"));
|
|
891 |
|
|
892 |
if (req->vbr_ack != VIRTIO_BLK_S_OK) {
|
|
893 |
error = req->vbr_ack == VIRTIO_BLK_S_UNSUPP ? ENOTSUP : EIO;
|
|
894 |
if (bootverbose)
|
|
895 |
device_printf(dev,
|
|
896 |
"vtblk_poll_request: IO error: %d\n", error);
|
|
897 |
}
|
|
898 |
|
|
899 |
return (error);
|
|
900 |
}
|
|
901 |
|
|
902 |
static void
|
|
903 |
vtblk_drain_vq(struct vtblk_softc *sc, int skip_done)
|
|
904 |
{
|
|
905 |
struct virtqueue *vq;
|
|
906 |
struct vtblk_request *req;
|
|
907 |
int last;
|
|
908 |
|
|
909 |
vq = sc->vtblk_vq;
|
|
910 |
last = 0;
|
|
911 |
|
|
912 |
while ((req = virtqueue_drain(vq, &last)) != NULL) {
|
|
913 |
if (!skip_done)
|
|
914 |
vtblk_bio_error(req->vbr_bp, ENXIO);
|
|
915 |
|
|
916 |
vtblk_enqueue_request(sc, req);
|
|
917 |
}
|
|
918 |
|
|
919 |
KASSERT(virtqueue_empty(vq), ("virtqueue not empty"));
|
|
920 |
}
|
|
921 |
|
|
922 |
static void
|
|
923 |
vtblk_drain(struct vtblk_softc *sc)
|
|
924 |
{
|
|
925 |
struct bio_queue_head *bioq;
|
|
926 |
struct vtblk_request *req;
|
|
927 |
struct bio *bp;
|
|
928 |
|
|
929 |
bioq = &sc->vtblk_bioq;
|
|
930 |
|
|
931 |
if (sc->vtblk_vq != NULL)
|
|
932 |
vtblk_drain_vq(sc, 0);
|
|
933 |
|
|
934 |
while ((req = vtblk_dequeue_ready(sc)) != NULL) {
|
|
935 |
vtblk_bio_error(req->vbr_bp, ENXIO);
|
|
936 |
vtblk_enqueue_request(sc, req);
|
|
937 |
}
|
|
938 |
|
|
939 |
while (bioq_first(bioq) != NULL) {
|
|
940 |
bp = bioq_takefirst(bioq);
|
|
941 |
vtblk_bio_error(bp, ENXIO);
|
|
942 |
}
|
|
943 |
|
|
944 |
vtblk_free_requests(sc);
|
|
945 |
}
|
|
946 |
|
|
947 |
static int
|
|
948 |
vtblk_alloc_requests(struct vtblk_softc *sc)
|
|
949 |
{
|
|
950 |
struct vtblk_request *req;
|
|
951 |
int i, nreqs;
|
|
952 |
|
|
953 |
nreqs = virtqueue_size(sc->vtblk_vq);
|
|
954 |
|
|
955 |
/*
|
|
956 |
* Preallocate sufficient requests to keep the virtqueue full. Each
|
|
957 |
* request consumes VTBLK_MIN_SEGMENTS or more descriptors so reduce
|
|
958 |
* the number allocated when indirect descriptors are not available.
|
|
959 |
*/
|
|
960 |
nreqs /= VTBLK_MIN_SEGMENTS;
|
|
961 |
|
|
962 |
for (i = 0; i < nreqs; i++) {
|
|
963 |
req = kmalloc(sizeof(struct vtblk_request), M_DEVBUF, M_WAITOK);
|
|
964 |
|
|
965 |
sc->vtblk_request_count++;
|
|
966 |
vtblk_enqueue_request(sc, req);
|
|
967 |
}
|
|
968 |
|
|
969 |
return (0);
|
|
970 |
}
|
|
971 |
|
|
972 |
static void
|
|
973 |
vtblk_free_requests(struct vtblk_softc *sc)
|
|
974 |
{
|
|
975 |
struct vtblk_request *req;
|
|
976 |
|
|
977 |
while ((req = vtblk_dequeue_request(sc)) != NULL) {
|
|
978 |
sc->vtblk_request_count--;
|
|
979 |
kfree(req, M_DEVBUF);
|
|
980 |
}
|
|
981 |
|
|
982 |
KASSERT(sc->vtblk_request_count == 0, ("leaked requests"));
|
|
983 |
}
|
|
984 |
|
|
985 |
static struct vtblk_request *
|
|
986 |
vtblk_dequeue_request(struct vtblk_softc *sc)
|
|
987 |
{
|
|
988 |
struct vtblk_request *req;
|
|
989 |
|
|
990 |
req = TAILQ_FIRST(&sc->vtblk_req_free);
|
|
991 |
if (req != NULL)
|
|
992 |
TAILQ_REMOVE(&sc->vtblk_req_free, req, vbr_link);
|
|
993 |
|
|
994 |
return (req);
|
|
995 |
}
|
|
996 |
|
|
997 |
static void
|
|
998 |
vtblk_enqueue_request(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
999 |
{
|
|
1000 |
bzero(req, sizeof(struct vtblk_request));
|
|
1001 |
TAILQ_INSERT_HEAD(&sc->vtblk_req_free, req, vbr_link);
|
|
1002 |
}
|
|
1003 |
|
|
1004 |
static struct vtblk_request *
|
|
1005 |
vtblk_dequeue_ready(struct vtblk_softc *sc)
|
|
1006 |
{
|
|
1007 |
struct vtblk_request *req;
|
|
1008 |
|
|
1009 |
req = TAILQ_FIRST(&sc->vtblk_req_ready);
|
|
1010 |
if (req != NULL)
|
|
1011 |
TAILQ_REMOVE(&sc->vtblk_req_ready, req, vbr_link);
|
|
1012 |
|
|
1013 |
return (req);
|
|
1014 |
}
|
|
1015 |
|
|
1016 |
static void
|
|
1017 |
vtblk_enqueue_ready(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
1018 |
{
|
|
1019 |
TAILQ_INSERT_HEAD(&sc->vtblk_req_ready, req, vbr_link);
|
|
1020 |
}
|
|
1021 |
|
|
1022 |
static void
|
|
1023 |
vtblk_bio_error(struct bio *bp, int error)
|
|
1024 |
{
|
|
1025 |
biodone(bp);
|
|
1026 |
}
|