1403 lines
32 KiB
C
1403 lines
32 KiB
C
/*-
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* Copyright (c) 2011, 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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/* Driver for VirtIO block devices. */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/sysctl.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <geom/geom_disk.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <dev/virtio/virtio.h>
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#include <dev/virtio/virtqueue.h>
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#include <dev/virtio/block/virtio_blk.h>
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#include "virtio_if.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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enum vtblk_cache_mode {
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VTBLK_CACHE_WRITETHROUGH,
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VTBLK_CACHE_WRITEBACK,
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VTBLK_CACHE_MAX
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};
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struct vtblk_softc {
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device_t vtblk_dev;
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struct mtx vtblk_mtx;
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uint64_t vtblk_features;
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uint32_t vtblk_flags;
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#define VTBLK_FLAG_INDIRECT 0x0001
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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_BARRIER 0x0010
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#define VTBLK_FLAG_WC_CONFIG 0x0020
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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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struct bio_queue_head vtblk_bioq;
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TAILQ_HEAD(, vtblk_request)
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vtblk_req_free;
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TAILQ_HEAD(, vtblk_request)
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vtblk_req_ready;
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struct vtblk_request *vtblk_req_ordered;
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int vtblk_max_nsegs;
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int vtblk_request_count;
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enum vtblk_cache_mode vtblk_write_cache;
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struct bio_queue vtblk_dump_queue;
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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_WCE, "WriteCache" },
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{ VIRTIO_BLK_F_TOPOLOGY, "Topology" },
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{ VIRTIO_BLK_F_CONFIG_WCE, "ConfigWCE" },
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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 int vtblk_config_change(device_t);
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static int vtblk_open(struct disk *);
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static int vtblk_close(struct disk *);
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static int vtblk_ioctl(struct disk *, u_long, void *, int,
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struct thread *);
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static int vtblk_dump(void *, void *, vm_offset_t, off_t, size_t);
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static void vtblk_strategy(struct bio *);
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static void vtblk_negotiate_features(struct vtblk_softc *);
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static void vtblk_setup_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_resize_disk(struct vtblk_softc *, uint64_t);
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static void vtblk_alloc_disk(struct vtblk_softc *,
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struct virtio_blk_config *);
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static void vtblk_create_disk(struct vtblk_softc *);
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static int vtblk_request_prealloc(struct vtblk_softc *);
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static void vtblk_request_free(struct vtblk_softc *);
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static struct vtblk_request *
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vtblk_request_dequeue(struct vtblk_softc *);
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static void vtblk_request_enqueue(struct vtblk_softc *,
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struct vtblk_request *);
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static struct vtblk_request *
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vtblk_request_next_ready(struct vtblk_softc *);
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static void vtblk_request_requeue_ready(struct vtblk_softc *,
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struct vtblk_request *);
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static struct vtblk_request *
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vtblk_request_next(struct vtblk_softc *);
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static struct vtblk_request *
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vtblk_request_bio(struct vtblk_softc *);
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static int vtblk_request_execute(struct vtblk_softc *,
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struct vtblk_request *);
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static int vtblk_request_error(struct vtblk_request *);
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static void vtblk_queue_completed(struct vtblk_softc *,
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struct bio_queue *);
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static void vtblk_done_completed(struct vtblk_softc *,
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struct bio_queue *);
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static void vtblk_drain_vq(struct vtblk_softc *);
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static void vtblk_drain(struct vtblk_softc *);
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static void vtblk_startio(struct vtblk_softc *);
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static void vtblk_bio_done(struct vtblk_softc *, struct bio *, int);
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static void vtblk_read_config(struct vtblk_softc *,
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struct virtio_blk_config *);
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static void vtblk_ident(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 int vtblk_quiesce(struct vtblk_softc *);
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static void vtblk_vq_intr(void *);
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static void vtblk_stop(struct vtblk_softc *);
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static void vtblk_dump_quiesce(struct vtblk_softc *);
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static int vtblk_dump_write(struct vtblk_softc *, void *, off_t, size_t);
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static int vtblk_dump_flush(struct vtblk_softc *);
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static void vtblk_dump_complete(struct vtblk_softc *);
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static void vtblk_set_write_cache(struct vtblk_softc *, int);
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static int vtblk_write_cache_enabled(struct vtblk_softc *sc,
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struct virtio_blk_config *);
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static int vtblk_write_cache_sysctl(SYSCTL_HANDLER_ARGS);
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static void vtblk_setup_sysctl(struct vtblk_softc *);
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static int vtblk_tunable_int(struct vtblk_softc *, const char *, 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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static int vtblk_writecache_mode = -1;
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TUNABLE_INT("hw.vtblk.writecache_mode", &vtblk_writecache_mode);
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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_WCE | \
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VIRTIO_BLK_F_TOPOLOGY | \
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VIRTIO_BLK_F_CONFIG_WCE | \
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VIRTIO_RING_F_INDIRECT_DESC)
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#define VTBLK_MTX(_sc) &(_sc)->vtblk_mtx
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#define VTBLK_LOCK_INIT(_sc, _name) \
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mtx_init(VTBLK_MTX((_sc)), (_name), \
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"VirtIO Block Lock", MTX_DEF)
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#define VTBLK_LOCK(_sc) mtx_lock(VTBLK_MTX((_sc)))
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#define VTBLK_UNLOCK(_sc) mtx_unlock(VTBLK_MTX((_sc)))
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#define VTBLK_LOCK_DESTROY(_sc) mtx_destroy(VTBLK_MTX((_sc)))
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#define VTBLK_LOCK_ASSERT(_sc) mtx_assert(VTBLK_MTX((_sc)), MA_OWNED)
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#define VTBLK_LOCK_ASSERT_NOTOWNED(_sc) \
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mtx_assert(VTBLK_MTX((_sc)), MA_NOTOWNED)
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#define VTBLK_DISK_NAME "vtbd"
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#define VTBLK_QUIESCE_TIMEOUT (30 * hz)
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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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/* VirtIO methods. */
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DEVMETHOD(virtio_config_change, vtblk_config_change),
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DEVMETHOD_END
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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_mmio, vtblk_driver, vtblk_devclass,
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vtblk_modevent, 0);
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DRIVER_MODULE(virtio_blk, virtio_pci, vtblk_driver, vtblk_devclass,
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vtblk_modevent, 0);
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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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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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case MOD_QUIESCE:
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case MOD_UNLOAD:
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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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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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virtio_set_feature_desc(dev, vtblk_feature_desc);
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sc = device_get_softc(dev);
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sc->vtblk_dev = dev;
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VTBLK_LOCK_INIT(sc, device_get_nameunit(dev));
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bioq_init(&sc->vtblk_bioq);
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TAILQ_INIT(&sc->vtblk_dump_queue);
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TAILQ_INIT(&sc->vtblk_req_free);
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TAILQ_INIT(&sc->vtblk_req_ready);
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vtblk_setup_sysctl(sc);
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vtblk_setup_features(sc);
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vtblk_read_config(sc, &blkcfg);
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/*
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* With the current sglist(9) implementation, it is not easy
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* for us to support a maximum segment size as adjacent
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* segments are coalesced. For now, just make sure it's larger
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* than the maximum supported transfer size.
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*/
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if (virtio_with_feature(dev, VIRTIO_BLK_F_SIZE_MAX)) {
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if (blkcfg.size_max < MAXPHYS) {
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error = ENOTSUP;
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device_printf(dev, "host requires unsupported "
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"maximum segment size feature\n");
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goto fail;
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}
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}
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sc->vtblk_max_nsegs = vtblk_maximum_segments(sc, &blkcfg);
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if (sc->vtblk_max_nsegs <= VTBLK_MIN_SEGMENTS) {
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error = EINVAL;
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device_printf(dev, "fewer than minimum number of segments "
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"allowed: %d\n", sc->vtblk_max_nsegs);
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goto fail;
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}
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sc->vtblk_sglist = sglist_alloc(sc->vtblk_max_nsegs, M_NOWAIT);
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if (sc->vtblk_sglist == NULL) {
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error = ENOMEM;
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device_printf(dev, "cannot allocate sglist\n");
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goto fail;
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}
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error = vtblk_alloc_virtqueue(sc);
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if (error) {
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device_printf(dev, "cannot allocate virtqueue\n");
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goto fail;
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}
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error = vtblk_request_prealloc(sc);
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if (error) {
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device_printf(dev, "cannot preallocate requests\n");
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goto fail;
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}
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vtblk_alloc_disk(sc, &blkcfg);
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error = virtio_setup_intr(dev, INTR_TYPE_BIO | INTR_ENTROPY);
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if (error) {
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device_printf(dev, "cannot setup virtqueue interrupt\n");
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goto fail;
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}
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vtblk_create_disk(sc);
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virtqueue_enable_intr(sc->vtblk_vq);
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fail:
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if (error)
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vtblk_detach(dev);
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return (error);
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}
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static int
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vtblk_detach(device_t dev)
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{
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struct vtblk_softc *sc;
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sc = device_get_softc(dev);
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VTBLK_LOCK(sc);
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sc->vtblk_flags |= VTBLK_FLAG_DETACH;
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if (device_is_attached(dev))
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vtblk_stop(sc);
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VTBLK_UNLOCK(sc);
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vtblk_drain(sc);
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if (sc->vtblk_disk != NULL) {
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disk_destroy(sc->vtblk_disk);
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sc->vtblk_disk = NULL;
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}
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if (sc->vtblk_sglist != NULL) {
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sglist_free(sc->vtblk_sglist);
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sc->vtblk_sglist = NULL;
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}
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VTBLK_LOCK_DESTROY(sc);
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return (0);
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}
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static int
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vtblk_suspend(device_t dev)
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{
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struct vtblk_softc *sc;
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int error;
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sc = device_get_softc(dev);
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VTBLK_LOCK(sc);
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sc->vtblk_flags |= VTBLK_FLAG_SUSPEND;
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/* XXX BMV: virtio_stop(), etc needed here? */
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error = vtblk_quiesce(sc);
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if (error)
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sc->vtblk_flags &= ~VTBLK_FLAG_SUSPEND;
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VTBLK_UNLOCK(sc);
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return (error);
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}
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|
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static int
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vtblk_resume(device_t dev)
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{
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struct vtblk_softc *sc;
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sc = device_get_softc(dev);
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VTBLK_LOCK(sc);
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/* XXX BMV: virtio_reinit(), etc needed here? */
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sc->vtblk_flags &= ~VTBLK_FLAG_SUSPEND;
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vtblk_startio(sc);
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VTBLK_UNLOCK(sc);
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|
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return (0);
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}
|
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|
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static int
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vtblk_shutdown(device_t dev)
|
|
{
|
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|
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return (0);
|
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}
|
|
|
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static int
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vtblk_config_change(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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uint64_t capacity;
|
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|
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sc = device_get_softc(dev);
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|
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vtblk_read_config(sc, &blkcfg);
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|
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/* Capacity is always in 512-byte units. */
|
|
capacity = blkcfg.capacity * 512;
|
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|
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if (sc->vtblk_disk->d_mediasize != capacity)
|
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vtblk_resize_disk(sc, capacity);
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|
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return (0);
|
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}
|
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|
|
static int
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vtblk_open(struct disk *dp)
|
|
{
|
|
struct vtblk_softc *sc;
|
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|
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if ((sc = dp->d_drv1) == NULL)
|
|
return (ENXIO);
|
|
|
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return (sc->vtblk_flags & VTBLK_FLAG_DETACH ? ENXIO : 0);
|
|
}
|
|
|
|
static int
|
|
vtblk_close(struct disk *dp)
|
|
{
|
|
struct vtblk_softc *sc;
|
|
|
|
if ((sc = dp->d_drv1) == NULL)
|
|
return (ENXIO);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vtblk_ioctl(struct disk *dp, u_long cmd, void *addr, int flag,
|
|
struct thread *td)
|
|
{
|
|
struct vtblk_softc *sc;
|
|
|
|
if ((sc = dp->d_drv1) == NULL)
|
|
return (ENXIO);
|
|
|
|
return (ENOTTY);
|
|
}
|
|
|
|
static int
|
|
vtblk_dump(void *arg, void *virtual, vm_offset_t physical, off_t offset,
|
|
size_t length)
|
|
{
|
|
struct disk *dp;
|
|
struct vtblk_softc *sc;
|
|
int error;
|
|
|
|
dp = arg;
|
|
error = 0;
|
|
|
|
if ((sc = dp->d_drv1) == NULL)
|
|
return (ENXIO);
|
|
|
|
VTBLK_LOCK(sc);
|
|
|
|
vtblk_dump_quiesce(sc);
|
|
|
|
if (length > 0)
|
|
error = vtblk_dump_write(sc, virtual, offset, length);
|
|
if (error || (virtual == NULL && offset == 0))
|
|
vtblk_dump_complete(sc);
|
|
|
|
VTBLK_UNLOCK(sc);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vtblk_strategy(struct bio *bp)
|
|
{
|
|
struct vtblk_softc *sc;
|
|
|
|
if ((sc = bp->bio_disk->d_drv1) == NULL) {
|
|
vtblk_bio_done(NULL, bp, EINVAL);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Fail any write if RO. Unfortunately, there does not seem to
|
|
* be a better way to report our readonly'ness to GEOM above.
|
|
*/
|
|
if (sc->vtblk_flags & VTBLK_FLAG_READONLY &&
|
|
(bp->bio_cmd == BIO_WRITE || bp->bio_cmd == BIO_FLUSH)) {
|
|
vtblk_bio_done(sc, bp, EROFS);
|
|
return;
|
|
}
|
|
|
|
VTBLK_LOCK(sc);
|
|
|
|
if (sc->vtblk_flags & VTBLK_FLAG_DETACH) {
|
|
VTBLK_UNLOCK(sc);
|
|
vtblk_bio_done(sc, bp, ENXIO);
|
|
return;
|
|
}
|
|
|
|
bioq_insert_tail(&sc->vtblk_bioq, bp);
|
|
vtblk_startio(sc);
|
|
|
|
VTBLK_UNLOCK(sc);
|
|
}
|
|
|
|
static void
|
|
vtblk_negotiate_features(struct vtblk_softc *sc)
|
|
{
|
|
device_t dev;
|
|
uint64_t features;
|
|
|
|
dev = sc->vtblk_dev;
|
|
features = VTBLK_FEATURES;
|
|
|
|
sc->vtblk_features = virtio_negotiate_features(dev, features);
|
|
}
|
|
|
|
static void
|
|
vtblk_setup_features(struct vtblk_softc *sc)
|
|
{
|
|
device_t dev;
|
|
|
|
dev = sc->vtblk_dev;
|
|
|
|
vtblk_negotiate_features(sc);
|
|
|
|
if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC))
|
|
sc->vtblk_flags |= VTBLK_FLAG_INDIRECT;
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_RO))
|
|
sc->vtblk_flags |= VTBLK_FLAG_READONLY;
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_BARRIER))
|
|
sc->vtblk_flags |= VTBLK_FLAG_BARRIER;
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_CONFIG_WCE))
|
|
sc->vtblk_flags |= VTBLK_FLAG_WC_CONFIG;
|
|
}
|
|
|
|
static int
|
|
vtblk_maximum_segments(struct vtblk_softc *sc,
|
|
struct virtio_blk_config *blkcfg)
|
|
{
|
|
device_t dev;
|
|
int nsegs;
|
|
|
|
dev = sc->vtblk_dev;
|
|
nsegs = VTBLK_MIN_SEGMENTS;
|
|
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_SEG_MAX)) {
|
|
nsegs += MIN(blkcfg->seg_max, MAXPHYS / PAGE_SIZE + 1);
|
|
if (sc->vtblk_flags & VTBLK_FLAG_INDIRECT)
|
|
nsegs = MIN(nsegs, VIRTIO_MAX_INDIRECT);
|
|
} else
|
|
nsegs += 1;
|
|
|
|
return (nsegs);
|
|
}
|
|
|
|
static int
|
|
vtblk_alloc_virtqueue(struct vtblk_softc *sc)
|
|
{
|
|
device_t dev;
|
|
struct vq_alloc_info vq_info;
|
|
|
|
dev = sc->vtblk_dev;
|
|
|
|
VQ_ALLOC_INFO_INIT(&vq_info, sc->vtblk_max_nsegs,
|
|
vtblk_vq_intr, sc, &sc->vtblk_vq,
|
|
"%s request", device_get_nameunit(dev));
|
|
|
|
return (virtio_alloc_virtqueues(dev, 0, 1, &vq_info));
|
|
}
|
|
|
|
static void
|
|
vtblk_resize_disk(struct vtblk_softc *sc, uint64_t new_capacity)
|
|
{
|
|
device_t dev;
|
|
struct disk *dp;
|
|
int error;
|
|
|
|
dev = sc->vtblk_dev;
|
|
dp = sc->vtblk_disk;
|
|
|
|
dp->d_mediasize = new_capacity;
|
|
if (bootverbose) {
|
|
device_printf(dev, "resized to %juMB (%ju %u byte sectors)\n",
|
|
(uintmax_t) dp->d_mediasize >> 20,
|
|
(uintmax_t) dp->d_mediasize / dp->d_sectorsize,
|
|
dp->d_sectorsize);
|
|
}
|
|
|
|
error = disk_resize(dp, M_NOWAIT);
|
|
if (error) {
|
|
device_printf(dev,
|
|
"disk_resize(9) failed, error: %d\n", error);
|
|
}
|
|
}
|
|
|
|
static void
|
|
vtblk_alloc_disk(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
|
|
{
|
|
device_t dev;
|
|
struct disk *dp;
|
|
|
|
dev = sc->vtblk_dev;
|
|
|
|
sc->vtblk_disk = dp = disk_alloc();
|
|
dp->d_open = vtblk_open;
|
|
dp->d_close = vtblk_close;
|
|
dp->d_ioctl = vtblk_ioctl;
|
|
dp->d_strategy = vtblk_strategy;
|
|
dp->d_name = VTBLK_DISK_NAME;
|
|
dp->d_unit = device_get_unit(dev);
|
|
dp->d_drv1 = sc;
|
|
dp->d_flags = DISKFLAG_CANFLUSHCACHE | DISKFLAG_UNMAPPED_BIO |
|
|
DISKFLAG_DIRECT_COMPLETION;
|
|
dp->d_hba_vendor = virtio_get_vendor(dev);
|
|
dp->d_hba_device = virtio_get_device(dev);
|
|
dp->d_hba_subvendor = virtio_get_subvendor(dev);
|
|
dp->d_hba_subdevice = virtio_get_subdevice(dev);
|
|
|
|
if ((sc->vtblk_flags & VTBLK_FLAG_READONLY) == 0)
|
|
dp->d_dump = vtblk_dump;
|
|
|
|
/* Capacity is always in 512-byte units. */
|
|
dp->d_mediasize = blkcfg->capacity * 512;
|
|
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_BLK_SIZE))
|
|
dp->d_sectorsize = blkcfg->blk_size;
|
|
else
|
|
dp->d_sectorsize = 512;
|
|
|
|
/*
|
|
* The VirtIO maximum I/O size is given in terms of segments.
|
|
* However, FreeBSD limits I/O size by logical buffer size, not
|
|
* by physically contiguous pages. Therefore, we have to assume
|
|
* no pages are contiguous. This may impose an artificially low
|
|
* maximum I/O size. But in practice, since QEMU advertises 128
|
|
* segments, this gives us a maximum IO size of 125 * PAGE_SIZE,
|
|
* which is typically greater than MAXPHYS. Eventually we should
|
|
* just advertise MAXPHYS and split buffers that are too big.
|
|
*
|
|
* Note we must subtract one additional segment in case of non
|
|
* page aligned buffers.
|
|
*/
|
|
dp->d_maxsize = (sc->vtblk_max_nsegs - VTBLK_MIN_SEGMENTS - 1) *
|
|
PAGE_SIZE;
|
|
if (dp->d_maxsize < PAGE_SIZE)
|
|
dp->d_maxsize = PAGE_SIZE; /* XXX */
|
|
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_GEOMETRY)) {
|
|
dp->d_fwsectors = blkcfg->geometry.sectors;
|
|
dp->d_fwheads = blkcfg->geometry.heads;
|
|
}
|
|
|
|
if (virtio_with_feature(dev, VIRTIO_BLK_F_TOPOLOGY) &&
|
|
blkcfg->topology.physical_block_exp > 0) {
|
|
dp->d_stripesize = dp->d_sectorsize *
|
|
(1 << blkcfg->topology.physical_block_exp);
|
|
dp->d_stripeoffset = (dp->d_stripesize -
|
|
blkcfg->topology.alignment_offset * dp->d_sectorsize) %
|
|
dp->d_stripesize;
|
|
}
|
|
|
|
if (vtblk_write_cache_enabled(sc, blkcfg) != 0)
|
|
sc->vtblk_write_cache = VTBLK_CACHE_WRITEBACK;
|
|
else
|
|
sc->vtblk_write_cache = VTBLK_CACHE_WRITETHROUGH;
|
|
}
|
|
|
|
static void
|
|
vtblk_create_disk(struct vtblk_softc *sc)
|
|
{
|
|
struct disk *dp;
|
|
|
|
dp = sc->vtblk_disk;
|
|
|
|
vtblk_ident(sc);
|
|
|
|
device_printf(sc->vtblk_dev, "%juMB (%ju %u byte sectors)\n",
|
|
(uintmax_t) dp->d_mediasize >> 20,
|
|
(uintmax_t) dp->d_mediasize / dp->d_sectorsize,
|
|
dp->d_sectorsize);
|
|
|
|
disk_create(dp, DISK_VERSION);
|
|
}
|
|
|
|
static int
|
|
vtblk_request_prealloc(struct vtblk_softc *sc)
|
|
{
|
|
struct vtblk_request *req;
|
|
int i, nreqs;
|
|
|
|
nreqs = virtqueue_size(sc->vtblk_vq);
|
|
|
|
/*
|
|
* Preallocate sufficient requests to keep the virtqueue full. Each
|
|
* request consumes VTBLK_MIN_SEGMENTS or more descriptors so reduce
|
|
* the number allocated when indirect descriptors are not available.
|
|
*/
|
|
if ((sc->vtblk_flags & VTBLK_FLAG_INDIRECT) == 0)
|
|
nreqs /= VTBLK_MIN_SEGMENTS;
|
|
|
|
for (i = 0; i < nreqs; i++) {
|
|
req = malloc(sizeof(struct vtblk_request), M_DEVBUF, M_NOWAIT);
|
|
if (req == NULL)
|
|
return (ENOMEM);
|
|
|
|
MPASS(sglist_count(&req->vbr_hdr, sizeof(req->vbr_hdr)) == 1);
|
|
MPASS(sglist_count(&req->vbr_ack, sizeof(req->vbr_ack)) == 1);
|
|
|
|
sc->vtblk_request_count++;
|
|
vtblk_request_enqueue(sc, req);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vtblk_request_free(struct vtblk_softc *sc)
|
|
{
|
|
struct vtblk_request *req;
|
|
|
|
MPASS(TAILQ_EMPTY(&sc->vtblk_req_ready));
|
|
|
|
while ((req = vtblk_request_dequeue(sc)) != NULL) {
|
|
sc->vtblk_request_count--;
|
|
free(req, M_DEVBUF);
|
|
}
|
|
|
|
KASSERT(sc->vtblk_request_count == 0,
|
|
("%s: leaked %d requests", __func__, sc->vtblk_request_count));
|
|
}
|
|
|
|
static struct vtblk_request *
|
|
vtblk_request_dequeue(struct vtblk_softc *sc)
|
|
{
|
|
struct vtblk_request *req;
|
|
|
|
req = TAILQ_FIRST(&sc->vtblk_req_free);
|
|
if (req != NULL) {
|
|
TAILQ_REMOVE(&sc->vtblk_req_free, req, vbr_link);
|
|
bzero(req, sizeof(struct vtblk_request));
|
|
}
|
|
|
|
return (req);
|
|
}
|
|
|
|
static void
|
|
vtblk_request_enqueue(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
{
|
|
|
|
TAILQ_INSERT_HEAD(&sc->vtblk_req_free, req, vbr_link);
|
|
}
|
|
|
|
static struct vtblk_request *
|
|
vtblk_request_next_ready(struct vtblk_softc *sc)
|
|
{
|
|
struct vtblk_request *req;
|
|
|
|
req = TAILQ_FIRST(&sc->vtblk_req_ready);
|
|
if (req != NULL)
|
|
TAILQ_REMOVE(&sc->vtblk_req_ready, req, vbr_link);
|
|
|
|
return (req);
|
|
}
|
|
|
|
static void
|
|
vtblk_request_requeue_ready(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
{
|
|
|
|
/* NOTE: Currently, there will be at most one request in the queue. */
|
|
TAILQ_INSERT_HEAD(&sc->vtblk_req_ready, req, vbr_link);
|
|
}
|
|
|
|
static struct vtblk_request *
|
|
vtblk_request_next(struct vtblk_softc *sc)
|
|
{
|
|
struct vtblk_request *req;
|
|
|
|
req = vtblk_request_next_ready(sc);
|
|
if (req != NULL)
|
|
return (req);
|
|
|
|
return (vtblk_request_bio(sc));
|
|
}
|
|
|
|
static struct vtblk_request *
|
|
vtblk_request_bio(struct vtblk_softc *sc)
|
|
{
|
|
struct bio_queue_head *bioq;
|
|
struct vtblk_request *req;
|
|
struct bio *bp;
|
|
|
|
bioq = &sc->vtblk_bioq;
|
|
|
|
if (bioq_first(bioq) == NULL)
|
|
return (NULL);
|
|
|
|
req = vtblk_request_dequeue(sc);
|
|
if (req == NULL)
|
|
return (NULL);
|
|
|
|
bp = bioq_takefirst(bioq);
|
|
req->vbr_bp = bp;
|
|
req->vbr_ack = -1;
|
|
req->vbr_hdr.ioprio = 1;
|
|
|
|
switch (bp->bio_cmd) {
|
|
case BIO_FLUSH:
|
|
req->vbr_hdr.type = VIRTIO_BLK_T_FLUSH;
|
|
break;
|
|
case BIO_READ:
|
|
req->vbr_hdr.type = VIRTIO_BLK_T_IN;
|
|
req->vbr_hdr.sector = bp->bio_offset / 512;
|
|
break;
|
|
case BIO_WRITE:
|
|
req->vbr_hdr.type = VIRTIO_BLK_T_OUT;
|
|
req->vbr_hdr.sector = bp->bio_offset / 512;
|
|
break;
|
|
default:
|
|
panic("%s: bio with unhandled cmd: %d", __func__, bp->bio_cmd);
|
|
}
|
|
|
|
if (bp->bio_flags & BIO_ORDERED)
|
|
req->vbr_hdr.type |= VIRTIO_BLK_T_BARRIER;
|
|
|
|
return (req);
|
|
}
|
|
|
|
static int
|
|
vtblk_request_execute(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
{
|
|
struct virtqueue *vq;
|
|
struct sglist *sg;
|
|
struct bio *bp;
|
|
int ordered, readable, writable, error;
|
|
|
|
vq = sc->vtblk_vq;
|
|
sg = sc->vtblk_sglist;
|
|
bp = req->vbr_bp;
|
|
ordered = 0;
|
|
writable = 0;
|
|
|
|
/*
|
|
* Some hosts (such as bhyve) do not implement the barrier feature,
|
|
* so we emulate it in the driver by allowing the barrier request
|
|
* to be the only one in flight.
|
|
*/
|
|
if ((sc->vtblk_flags & VTBLK_FLAG_BARRIER) == 0) {
|
|
if (sc->vtblk_req_ordered != NULL)
|
|
return (EBUSY);
|
|
if (bp->bio_flags & BIO_ORDERED) {
|
|
if (!virtqueue_empty(vq))
|
|
return (EBUSY);
|
|
ordered = 1;
|
|
req->vbr_hdr.type &= ~VIRTIO_BLK_T_BARRIER;
|
|
}
|
|
}
|
|
|
|
sglist_reset(sg);
|
|
sglist_append(sg, &req->vbr_hdr, sizeof(struct virtio_blk_outhdr));
|
|
|
|
if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) {
|
|
error = sglist_append_bio(sg, bp);
|
|
if (error || sg->sg_nseg == sg->sg_maxseg) {
|
|
panic("%s: bio %p data buffer too big %d",
|
|
__func__, bp, error);
|
|
}
|
|
|
|
/* BIO_READ means the host writes into our buffer. */
|
|
if (bp->bio_cmd == BIO_READ)
|
|
writable = sg->sg_nseg - 1;
|
|
}
|
|
|
|
writable++;
|
|
sglist_append(sg, &req->vbr_ack, sizeof(uint8_t));
|
|
readable = sg->sg_nseg - writable;
|
|
|
|
error = virtqueue_enqueue(vq, req, sg, readable, writable);
|
|
if (error == 0 && ordered)
|
|
sc->vtblk_req_ordered = req;
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
vtblk_request_error(struct vtblk_request *req)
|
|
{
|
|
int error;
|
|
|
|
switch (req->vbr_ack) {
|
|
case VIRTIO_BLK_S_OK:
|
|
error = 0;
|
|
break;
|
|
case VIRTIO_BLK_S_UNSUPP:
|
|
error = ENOTSUP;
|
|
break;
|
|
default:
|
|
error = EIO;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vtblk_queue_completed(struct vtblk_softc *sc, struct bio_queue *queue)
|
|
{
|
|
struct vtblk_request *req;
|
|
struct bio *bp;
|
|
|
|
while ((req = virtqueue_dequeue(sc->vtblk_vq, NULL)) != NULL) {
|
|
if (sc->vtblk_req_ordered != NULL) {
|
|
MPASS(sc->vtblk_req_ordered == req);
|
|
sc->vtblk_req_ordered = NULL;
|
|
}
|
|
|
|
bp = req->vbr_bp;
|
|
bp->bio_error = vtblk_request_error(req);
|
|
TAILQ_INSERT_TAIL(queue, bp, bio_queue);
|
|
|
|
vtblk_request_enqueue(sc, req);
|
|
}
|
|
}
|
|
|
|
static void
|
|
vtblk_done_completed(struct vtblk_softc *sc, struct bio_queue *queue)
|
|
{
|
|
struct bio *bp, *tmp;
|
|
|
|
TAILQ_FOREACH_SAFE(bp, queue, bio_queue, tmp) {
|
|
if (bp->bio_error != 0)
|
|
disk_err(bp, "hard error", -1, 1);
|
|
vtblk_bio_done(sc, bp, bp->bio_error);
|
|
}
|
|
}
|
|
|
|
static void
|
|
vtblk_drain_vq(struct vtblk_softc *sc)
|
|
{
|
|
struct virtqueue *vq;
|
|
struct vtblk_request *req;
|
|
int last;
|
|
|
|
vq = sc->vtblk_vq;
|
|
last = 0;
|
|
|
|
while ((req = virtqueue_drain(vq, &last)) != NULL) {
|
|
vtblk_bio_done(sc, req->vbr_bp, ENXIO);
|
|
vtblk_request_enqueue(sc, req);
|
|
}
|
|
|
|
sc->vtblk_req_ordered = NULL;
|
|
KASSERT(virtqueue_empty(vq), ("virtqueue not empty"));
|
|
}
|
|
|
|
static void
|
|
vtblk_drain(struct vtblk_softc *sc)
|
|
{
|
|
struct bio_queue queue;
|
|
struct bio_queue_head *bioq;
|
|
struct vtblk_request *req;
|
|
struct bio *bp;
|
|
|
|
bioq = &sc->vtblk_bioq;
|
|
TAILQ_INIT(&queue);
|
|
|
|
if (sc->vtblk_vq != NULL) {
|
|
vtblk_queue_completed(sc, &queue);
|
|
vtblk_done_completed(sc, &queue);
|
|
|
|
vtblk_drain_vq(sc);
|
|
}
|
|
|
|
while ((req = vtblk_request_next_ready(sc)) != NULL) {
|
|
vtblk_bio_done(sc, req->vbr_bp, ENXIO);
|
|
vtblk_request_enqueue(sc, req);
|
|
}
|
|
|
|
while (bioq_first(bioq) != NULL) {
|
|
bp = bioq_takefirst(bioq);
|
|
vtblk_bio_done(sc, bp, ENXIO);
|
|
}
|
|
|
|
vtblk_request_free(sc);
|
|
}
|
|
|
|
static void
|
|
vtblk_startio(struct vtblk_softc *sc)
|
|
{
|
|
struct virtqueue *vq;
|
|
struct vtblk_request *req;
|
|
int enq;
|
|
|
|
VTBLK_LOCK_ASSERT(sc);
|
|
vq = sc->vtblk_vq;
|
|
enq = 0;
|
|
|
|
if (sc->vtblk_flags & VTBLK_FLAG_SUSPEND)
|
|
return;
|
|
|
|
while (!virtqueue_full(vq)) {
|
|
req = vtblk_request_next(sc);
|
|
if (req == NULL)
|
|
break;
|
|
|
|
if (vtblk_request_execute(sc, req) != 0) {
|
|
vtblk_request_requeue_ready(sc, req);
|
|
break;
|
|
}
|
|
|
|
enq++;
|
|
}
|
|
|
|
if (enq > 0)
|
|
virtqueue_notify(vq);
|
|
}
|
|
|
|
static void
|
|
vtblk_bio_done(struct vtblk_softc *sc, struct bio *bp, int error)
|
|
{
|
|
|
|
/* Because of GEOM direct dispatch, we cannot hold any locks. */
|
|
if (sc != NULL)
|
|
VTBLK_LOCK_ASSERT_NOTOWNED(sc);
|
|
|
|
if (error) {
|
|
bp->bio_resid = bp->bio_bcount;
|
|
bp->bio_error = error;
|
|
bp->bio_flags |= BIO_ERROR;
|
|
}
|
|
|
|
biodone(bp);
|
|
}
|
|
|
|
#define VTBLK_GET_CONFIG(_dev, _feature, _field, _cfg) \
|
|
if (virtio_with_feature(_dev, _feature)) { \
|
|
virtio_read_device_config(_dev, \
|
|
offsetof(struct virtio_blk_config, _field), \
|
|
&(_cfg)->_field, sizeof((_cfg)->_field)); \
|
|
}
|
|
|
|
static void
|
|
vtblk_read_config(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
|
|
{
|
|
device_t dev;
|
|
|
|
dev = sc->vtblk_dev;
|
|
|
|
bzero(blkcfg, sizeof(struct virtio_blk_config));
|
|
|
|
/* The capacity is always available. */
|
|
virtio_read_device_config(dev, offsetof(struct virtio_blk_config,
|
|
capacity), &blkcfg->capacity, sizeof(blkcfg->capacity));
|
|
|
|
/* Read the configuration if the feature was negotiated. */
|
|
VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_SIZE_MAX, size_max, blkcfg);
|
|
VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_SEG_MAX, seg_max, blkcfg);
|
|
VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_GEOMETRY, geometry, blkcfg);
|
|
VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_BLK_SIZE, blk_size, blkcfg);
|
|
VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_TOPOLOGY, topology, blkcfg);
|
|
VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_CONFIG_WCE, writeback, blkcfg);
|
|
}
|
|
|
|
#undef VTBLK_GET_CONFIG
|
|
|
|
static void
|
|
vtblk_ident(struct vtblk_softc *sc)
|
|
{
|
|
struct bio buf;
|
|
struct disk *dp;
|
|
struct vtblk_request *req;
|
|
int len, error;
|
|
|
|
dp = sc->vtblk_disk;
|
|
len = MIN(VIRTIO_BLK_ID_BYTES, DISK_IDENT_SIZE);
|
|
|
|
if (vtblk_tunable_int(sc, "no_ident", vtblk_no_ident) != 0)
|
|
return;
|
|
|
|
req = vtblk_request_dequeue(sc);
|
|
if (req == NULL)
|
|
return;
|
|
|
|
req->vbr_ack = -1;
|
|
req->vbr_hdr.type = VIRTIO_BLK_T_GET_ID;
|
|
req->vbr_hdr.ioprio = 1;
|
|
req->vbr_hdr.sector = 0;
|
|
|
|
req->vbr_bp = &buf;
|
|
bzero(&buf, sizeof(struct bio));
|
|
|
|
buf.bio_cmd = BIO_READ;
|
|
buf.bio_data = dp->d_ident;
|
|
buf.bio_bcount = len;
|
|
|
|
VTBLK_LOCK(sc);
|
|
error = vtblk_poll_request(sc, req);
|
|
VTBLK_UNLOCK(sc);
|
|
|
|
vtblk_request_enqueue(sc, req);
|
|
|
|
if (error) {
|
|
device_printf(sc->vtblk_dev,
|
|
"error getting device identifier: %d\n", error);
|
|
}
|
|
}
|
|
|
|
static int
|
|
vtblk_poll_request(struct vtblk_softc *sc, struct vtblk_request *req)
|
|
{
|
|
struct virtqueue *vq;
|
|
int error;
|
|
|
|
vq = sc->vtblk_vq;
|
|
|
|
if (!virtqueue_empty(vq))
|
|
return (EBUSY);
|
|
|
|
error = vtblk_request_execute(sc, req);
|
|
if (error)
|
|
return (error);
|
|
|
|
virtqueue_notify(vq);
|
|
virtqueue_poll(vq, NULL);
|
|
|
|
error = vtblk_request_error(req);
|
|
if (error && bootverbose) {
|
|
device_printf(sc->vtblk_dev,
|
|
"%s: IO error: %d\n", __func__, error);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
vtblk_quiesce(struct vtblk_softc *sc)
|
|
{
|
|
int error;
|
|
|
|
VTBLK_LOCK_ASSERT(sc);
|
|
error = 0;
|
|
|
|
while (!virtqueue_empty(sc->vtblk_vq)) {
|
|
if (mtx_sleep(&sc->vtblk_vq, VTBLK_MTX(sc), PRIBIO, "vtblkq",
|
|
VTBLK_QUIESCE_TIMEOUT) == EWOULDBLOCK) {
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
vtblk_vq_intr(void *xsc)
|
|
{
|
|
struct vtblk_softc *sc;
|
|
struct virtqueue *vq;
|
|
struct bio_queue queue;
|
|
|
|
sc = xsc;
|
|
vq = sc->vtblk_vq;
|
|
TAILQ_INIT(&queue);
|
|
|
|
VTBLK_LOCK(sc);
|
|
|
|
again:
|
|
if (sc->vtblk_flags & VTBLK_FLAG_DETACH)
|
|
goto out;
|
|
|
|
vtblk_queue_completed(sc, &queue);
|
|
vtblk_startio(sc);
|
|
|
|
if (virtqueue_enable_intr(vq) != 0) {
|
|
virtqueue_disable_intr(vq);
|
|
goto again;
|
|
}
|
|
|
|
if (sc->vtblk_flags & VTBLK_FLAG_SUSPEND)
|
|
wakeup(&sc->vtblk_vq);
|
|
|
|
out:
|
|
VTBLK_UNLOCK(sc);
|
|
vtblk_done_completed(sc, &queue);
|
|
}
|
|
|
|
static void
|
|
vtblk_stop(struct vtblk_softc *sc)
|
|
{
|
|
|
|
virtqueue_disable_intr(sc->vtblk_vq);
|
|
virtio_stop(sc->vtblk_dev);
|
|
}
|
|
|
|
static void
|
|
vtblk_dump_quiesce(struct vtblk_softc *sc)
|
|
{
|
|
|
|
/*
|
|
* Spin here until all the requests in-flight at the time of the
|
|
* dump are completed and queued. The queued requests will be
|
|
* biodone'd once the dump is finished.
|
|
*/
|
|
while (!virtqueue_empty(sc->vtblk_vq))
|
|
vtblk_queue_completed(sc, &sc->vtblk_dump_queue);
|
|
}
|
|
|
|
static int
|
|
vtblk_dump_write(struct vtblk_softc *sc, void *virtual, off_t offset,
|
|
size_t length)
|
|
{
|
|
struct bio buf;
|
|
struct vtblk_request *req;
|
|
|
|
req = &sc->vtblk_dump_request;
|
|
req->vbr_ack = -1;
|
|
req->vbr_hdr.type = VIRTIO_BLK_T_OUT;
|
|
req->vbr_hdr.ioprio = 1;
|
|
req->vbr_hdr.sector = offset / 512;
|
|
|
|
req->vbr_bp = &buf;
|
|
bzero(&buf, sizeof(struct bio));
|
|
|
|
buf.bio_cmd = BIO_WRITE;
|
|
buf.bio_data = virtual;
|
|
buf.bio_bcount = length;
|
|
|
|
return (vtblk_poll_request(sc, req));
|
|
}
|
|
|
|
static int
|
|
vtblk_dump_flush(struct vtblk_softc *sc)
|
|
{
|
|
struct bio buf;
|
|
struct vtblk_request *req;
|
|
|
|
req = &sc->vtblk_dump_request;
|
|
req->vbr_ack = -1;
|
|
req->vbr_hdr.type = VIRTIO_BLK_T_FLUSH;
|
|
req->vbr_hdr.ioprio = 1;
|
|
req->vbr_hdr.sector = 0;
|
|
|
|
req->vbr_bp = &buf;
|
|
bzero(&buf, sizeof(struct bio));
|
|
|
|
buf.bio_cmd = BIO_FLUSH;
|
|
|
|
return (vtblk_poll_request(sc, req));
|
|
}
|
|
|
|
static void
|
|
vtblk_dump_complete(struct vtblk_softc *sc)
|
|
{
|
|
|
|
vtblk_dump_flush(sc);
|
|
|
|
VTBLK_UNLOCK(sc);
|
|
vtblk_done_completed(sc, &sc->vtblk_dump_queue);
|
|
VTBLK_LOCK(sc);
|
|
}
|
|
|
|
static void
|
|
vtblk_set_write_cache(struct vtblk_softc *sc, int wc)
|
|
{
|
|
|
|
/* Set either writeback (1) or writethrough (0) mode. */
|
|
virtio_write_dev_config_1(sc->vtblk_dev,
|
|
offsetof(struct virtio_blk_config, writeback), wc);
|
|
}
|
|
|
|
static int
|
|
vtblk_write_cache_enabled(struct vtblk_softc *sc,
|
|
struct virtio_blk_config *blkcfg)
|
|
{
|
|
int wc;
|
|
|
|
if (sc->vtblk_flags & VTBLK_FLAG_WC_CONFIG) {
|
|
wc = vtblk_tunable_int(sc, "writecache_mode",
|
|
vtblk_writecache_mode);
|
|
if (wc >= 0 && wc < VTBLK_CACHE_MAX)
|
|
vtblk_set_write_cache(sc, wc);
|
|
else
|
|
wc = blkcfg->writeback;
|
|
} else
|
|
wc = virtio_with_feature(sc->vtblk_dev, VIRTIO_BLK_F_WCE);
|
|
|
|
return (wc);
|
|
}
|
|
|
|
static int
|
|
vtblk_write_cache_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct vtblk_softc *sc;
|
|
int wc, error;
|
|
|
|
sc = oidp->oid_arg1;
|
|
wc = sc->vtblk_write_cache;
|
|
|
|
error = sysctl_handle_int(oidp, &wc, 0, req);
|
|
if (error || req->newptr == NULL)
|
|
return (error);
|
|
if ((sc->vtblk_flags & VTBLK_FLAG_WC_CONFIG) == 0)
|
|
return (EPERM);
|
|
if (wc < 0 || wc >= VTBLK_CACHE_MAX)
|
|
return (EINVAL);
|
|
|
|
VTBLK_LOCK(sc);
|
|
sc->vtblk_write_cache = wc;
|
|
vtblk_set_write_cache(sc, sc->vtblk_write_cache);
|
|
VTBLK_UNLOCK(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vtblk_setup_sysctl(struct vtblk_softc *sc)
|
|
{
|
|
device_t dev;
|
|
struct sysctl_ctx_list *ctx;
|
|
struct sysctl_oid *tree;
|
|
struct sysctl_oid_list *child;
|
|
|
|
dev = sc->vtblk_dev;
|
|
ctx = device_get_sysctl_ctx(dev);
|
|
tree = device_get_sysctl_tree(dev);
|
|
child = SYSCTL_CHILDREN(tree);
|
|
|
|
SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "writecache_mode",
|
|
CTLTYPE_INT | CTLFLAG_RW, sc, 0, vtblk_write_cache_sysctl,
|
|
"I", "Write cache mode (writethrough (0) or writeback (1))");
|
|
}
|
|
|
|
static int
|
|
vtblk_tunable_int(struct vtblk_softc *sc, const char *knob, int def)
|
|
{
|
|
char path[64];
|
|
|
|
snprintf(path, sizeof(path),
|
|
"hw.vtblk.%d.%s", device_get_unit(sc->vtblk_dev), knob);
|
|
TUNABLE_INT_FETCH(path, &def);
|
|
|
|
return (def);
|
|
}
|