2011-05-13 04:54:01 +00:00
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/*-
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* Copyright (c) 2011 NetApp, Inc.
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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, this list of conditions and the following 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 NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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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/linker_set.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/ioctl.h>
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2012-12-08 02:37:18 +00:00
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#include <sys/disk.h>
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2011-05-13 04:54:01 +00:00
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <assert.h>
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#include <pthread.h>
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2013-10-12 19:31:19 +00:00
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#include <md5.h>
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2011-05-13 04:54:01 +00:00
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2012-12-13 01:58:11 +00:00
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#include "bhyverun.h"
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2011-05-13 04:54:01 +00:00
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#include "pci_emul.h"
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#include "virtio.h"
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2013-10-12 19:31:19 +00:00
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#ifndef min
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#endif
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2011-05-13 04:54:01 +00:00
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#define VTBLK_RINGSZ 64
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#define VTBLK_MAXSEGS 32
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#define VTBLK_S_OK 0
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#define VTBLK_S_IOERR 1
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2013-10-12 19:31:19 +00:00
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#define VTBLK_S_UNSUPP 2
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#define VTBLK_BLK_ID_BYTES 20
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2011-05-13 04:54:01 +00:00
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2013-10-23 18:54:58 +00:00
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/* Capability bits */
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#define VTBLK_F_SEG_MAX (1 << 2) /* Maximum request segments */
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#define VTBLK_F_BLK_SIZE (1 << 6) /* cfg block size valid */
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2011-05-13 04:54:01 +00:00
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/*
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* Host capabilities
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*/
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#define VTBLK_S_HOSTCAPS \
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2013-10-23 18:54:58 +00:00
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( VTBLK_F_SEG_MAX | \
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VTBLK_F_BLK_SIZE | \
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2013-07-17 23:37:33 +00:00
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VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */
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2011-05-13 04:54:01 +00:00
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/*
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2013-07-17 23:37:33 +00:00
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* Config space "registers"
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2011-05-13 04:54:01 +00:00
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*/
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struct vtblk_config {
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uint64_t vbc_capacity;
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uint32_t vbc_size_max;
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uint32_t vbc_seg_max;
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uint16_t vbc_geom_c;
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uint8_t vbc_geom_h;
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uint8_t vbc_geom_s;
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uint32_t vbc_blk_size;
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uint32_t vbc_sectors_max;
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} __packed;
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/*
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* Fixed-size block header
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*/
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struct virtio_blk_hdr {
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2013-02-26 20:02:17 +00:00
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#define VBH_OP_READ 0
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#define VBH_OP_WRITE 1
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2013-10-12 19:31:19 +00:00
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#define VBH_OP_IDENT 8
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2013-02-26 20:02:17 +00:00
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#define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */
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2011-05-13 04:54:01 +00:00
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uint32_t vbh_type;
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uint32_t vbh_ioprio;
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uint64_t vbh_sector;
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} __packed;
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/*
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* Debug printf
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*/
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static int pci_vtblk_debug;
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#define DPRINTF(params) if (pci_vtblk_debug) printf params
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#define WPRINTF(params) printf params
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/*
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* Per-device softc
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*/
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struct pci_vtblk_softc {
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2013-07-17 23:37:33 +00:00
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struct virtio_softc vbsc_vs;
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2014-01-29 14:56:48 +00:00
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pthread_mutex_t vsc_mtx;
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2013-07-17 23:37:33 +00:00
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struct vqueue_info vbsc_vq;
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2011-05-13 04:54:01 +00:00
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int vbsc_fd;
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struct vtblk_config vbsc_cfg;
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2013-10-12 19:31:19 +00:00
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char vbsc_ident[VTBLK_BLK_ID_BYTES];
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2011-05-13 04:54:01 +00:00
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};
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2013-07-17 23:37:33 +00:00
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static void pci_vtblk_reset(void *);
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static void pci_vtblk_notify(void *, struct vqueue_info *);
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static int pci_vtblk_cfgread(void *, int, int, uint32_t *);
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static int pci_vtblk_cfgwrite(void *, int, int, uint32_t);
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static struct virtio_consts vtblk_vi_consts = {
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"vtblk", /* our name */
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1, /* we support 1 virtqueue */
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sizeof(struct vtblk_config), /* config reg size */
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pci_vtblk_reset, /* reset */
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pci_vtblk_notify, /* device-wide qnotify */
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pci_vtblk_cfgread, /* read PCI config */
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pci_vtblk_cfgwrite, /* write PCI config */
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VTBLK_S_HOSTCAPS, /* our capabilities */
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};
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2011-05-13 04:54:01 +00:00
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static void
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2013-07-17 23:37:33 +00:00
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pci_vtblk_reset(void *vsc)
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2011-05-13 04:54:01 +00:00
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{
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2013-07-17 23:37:33 +00:00
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struct pci_vtblk_softc *sc = vsc;
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2011-05-13 04:54:01 +00:00
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2013-07-17 23:37:33 +00:00
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DPRINTF(("vtblk: device reset requested !\n"));
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vi_reset_dev(&sc->vbsc_vs);
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2011-05-13 04:54:01 +00:00
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}
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static void
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2013-07-17 23:37:33 +00:00
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pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq)
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2011-05-13 04:54:01 +00:00
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{
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struct virtio_blk_hdr *vbh;
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uint8_t *status;
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2013-07-17 23:37:33 +00:00
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int i, n;
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2011-05-13 04:54:01 +00:00
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int err;
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int iolen;
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2013-07-17 23:37:33 +00:00
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int writeop, type;
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2011-05-13 04:54:01 +00:00
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off_t offset;
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2013-07-17 23:37:33 +00:00
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struct iovec iov[VTBLK_MAXSEGS + 2];
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uint16_t flags[VTBLK_MAXSEGS + 2];
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2011-05-13 04:54:01 +00:00
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2013-07-17 23:37:33 +00:00
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n = vq_getchain(vq, iov, VTBLK_MAXSEGS + 2, flags);
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2011-05-13 04:54:01 +00:00
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/*
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2013-07-17 23:37:33 +00:00
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* The first descriptor will be the read-only fixed header,
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* and the last is for status (hence +2 above and below).
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* The remaining iov's are the actual data I/O vectors.
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*
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* XXX - note - this fails on crash dump, which does a
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* VIRTIO_BLK_T_FLUSH with a zero transfer length
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2011-05-13 04:54:01 +00:00
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*/
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2013-09-26 16:25:06 +00:00
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assert(n >= 2 && n <= VTBLK_MAXSEGS + 2);
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2013-07-17 23:37:33 +00:00
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assert((flags[0] & VRING_DESC_F_WRITE) == 0);
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assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr));
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vbh = iov[0].iov_base;
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status = iov[--n].iov_base;
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assert(iov[n].iov_len == 1);
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assert(flags[n] & VRING_DESC_F_WRITE);
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2011-05-13 04:54:01 +00:00
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2013-02-26 20:02:17 +00:00
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/*
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* XXX
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* The guest should not be setting the BARRIER flag because
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* we don't advertise the capability.
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*/
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type = vbh->vbh_type & ~VBH_FLAG_BARRIER;
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writeop = (type == VBH_OP_WRITE);
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2011-05-13 04:54:01 +00:00
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offset = vbh->vbh_sector * DEV_BSIZE;
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2013-07-17 23:37:33 +00:00
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iolen = 0;
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for (i = 1; i < n; i++) {
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2011-05-13 04:54:01 +00:00
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/*
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* - write op implies read-only descriptor,
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2013-10-12 19:31:19 +00:00
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* - read/ident op implies write-only descriptor,
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2011-05-13 04:54:01 +00:00
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* therefore test the inverse of the descriptor bit
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* to the op.
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*/
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2013-07-17 23:37:33 +00:00
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assert(((flags[i] & VRING_DESC_F_WRITE) == 0) == writeop);
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iolen += iov[i].iov_len;
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2011-05-13 04:54:01 +00:00
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}
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DPRINTF(("virtio-block: %s op, %d bytes, %d segs, offset %ld\n\r",
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2013-10-12 19:31:19 +00:00
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writeop ? "write" : "read/ident", iolen, i - 1, offset));
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2011-05-13 04:54:01 +00:00
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2013-10-12 19:31:19 +00:00
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switch (type) {
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case VBH_OP_WRITE:
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2013-07-17 23:37:33 +00:00
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err = pwritev(sc->vbsc_fd, iov + 1, i - 1, offset);
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2013-10-12 19:31:19 +00:00
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break;
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case VBH_OP_READ:
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2013-07-17 23:37:33 +00:00
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err = preadv(sc->vbsc_fd, iov + 1, i - 1, offset);
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2013-10-12 19:31:19 +00:00
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break;
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case VBH_OP_IDENT:
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/* Assume a single buffer */
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strlcpy(iov[1].iov_base, sc->vbsc_ident,
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min(iov[1].iov_len, sizeof(sc->vbsc_ident)));
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err = 0;
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break;
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default:
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err = -ENOSYS;
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break;
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}
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2011-05-13 04:54:01 +00:00
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2013-10-12 19:31:19 +00:00
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/* convert errno into a virtio block error return */
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if (err < 0) {
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if (err == -ENOSYS)
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*status = VTBLK_S_UNSUPP;
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else
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*status = VTBLK_S_IOERR;
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} else
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*status = VTBLK_S_OK;
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2011-05-13 04:54:01 +00:00
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/*
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2013-07-17 23:37:33 +00:00
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* Return the descriptor back to the host.
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* We wrote 1 byte (our status) to host.
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2011-05-13 04:54:01 +00:00
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*/
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2013-07-17 23:37:33 +00:00
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vq_relchain(vq, 1);
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2013-04-23 16:40:39 +00:00
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}
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static void
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2013-07-17 23:37:33 +00:00
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pci_vtblk_notify(void *vsc, struct vqueue_info *vq)
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2013-04-23 16:40:39 +00:00
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{
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2013-07-17 23:37:33 +00:00
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struct pci_vtblk_softc *sc = vsc;
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2013-04-23 16:40:39 +00:00
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2013-07-17 23:37:33 +00:00
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vq_startchains(vq);
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while (vq_has_descs(vq))
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pci_vtblk_proc(sc, vq);
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vq_endchains(vq, 1); /* Generate interrupt if appropriate. */
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2011-05-13 04:54:01 +00:00
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}
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static int
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pci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
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{
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struct stat sbuf;
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2013-10-12 19:31:19 +00:00
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MD5_CTX mdctx;
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u_char digest[16];
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2011-05-13 04:54:01 +00:00
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struct pci_vtblk_softc *sc;
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2012-12-08 02:37:18 +00:00
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off_t size;
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2011-05-13 04:54:01 +00:00
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int fd;
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2012-12-08 02:37:18 +00:00
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int sectsz;
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2011-05-13 04:54:01 +00:00
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if (opts == NULL) {
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printf("virtio-block: backing device required\n");
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return (1);
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}
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/*
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* The supplied backing file has to exist
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*/
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fd = open(opts, O_RDWR);
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if (fd < 0) {
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perror("Could not open backing file");
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return (1);
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}
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if (fstat(fd, &sbuf) < 0) {
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perror("Could not stat backing file");
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close(fd);
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return (1);
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}
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2012-12-08 02:37:18 +00:00
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/*
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* Deal with raw devices
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*/
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size = sbuf.st_size;
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sectsz = DEV_BSIZE;
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if (S_ISCHR(sbuf.st_mode)) {
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if (ioctl(fd, DIOCGMEDIASIZE, &size) < 0 ||
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ioctl(fd, DIOCGSECTORSIZE, §sz)) {
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perror("Could not fetch dev blk/sector size");
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close(fd);
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return (1);
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}
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assert(size != 0);
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assert(sectsz != 0);
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}
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2011-05-13 04:54:01 +00:00
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sc = malloc(sizeof(struct pci_vtblk_softc));
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memset(sc, 0, sizeof(struct pci_vtblk_softc));
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2013-07-17 23:37:33 +00:00
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/* record fd of storage device/file */
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2011-05-13 04:54:01 +00:00
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sc->vbsc_fd = fd;
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2014-01-29 14:56:48 +00:00
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pthread_mutex_init(&sc->vsc_mtx, NULL);
|
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
/* init virtio softc and virtqueues */
|
|
|
|
vi_softc_linkup(&sc->vbsc_vs, &vtblk_vi_consts, sc, pi, &sc->vbsc_vq);
|
2014-01-29 14:56:48 +00:00
|
|
|
sc->vbsc_vs.vs_mtx = &sc->vsc_mtx;
|
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ;
|
|
|
|
/* sc->vbsc_vq.vq_notify = we have no per-queue notify */
|
|
|
|
|
2013-10-12 19:31:19 +00:00
|
|
|
/*
|
|
|
|
* Create an identifier for the backing file. Use parts of the
|
|
|
|
* md5 sum of the filename
|
|
|
|
*/
|
|
|
|
MD5Init(&mdctx);
|
|
|
|
MD5Update(&mdctx, opts, strlen(opts));
|
|
|
|
MD5Final(digest, &mdctx);
|
|
|
|
sprintf(sc->vbsc_ident, "BHYVE-%02X%02X-%02X%02X-%02X%02X",
|
|
|
|
digest[0], digest[1], digest[2], digest[3], digest[4], digest[5]);
|
|
|
|
|
2011-05-13 04:54:01 +00:00
|
|
|
/* setup virtio block config space */
|
2013-10-23 18:54:58 +00:00
|
|
|
sc->vbsc_cfg.vbc_capacity = size / DEV_BSIZE; /* 512-byte units */
|
2011-05-13 04:54:01 +00:00
|
|
|
sc->vbsc_cfg.vbc_seg_max = VTBLK_MAXSEGS;
|
2012-12-08 02:37:18 +00:00
|
|
|
sc->vbsc_cfg.vbc_blk_size = sectsz;
|
2011-05-13 04:54:01 +00:00
|
|
|
sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */
|
|
|
|
sc->vbsc_cfg.vbc_geom_c = 0; /* no geometry */
|
|
|
|
sc->vbsc_cfg.vbc_geom_h = 0;
|
|
|
|
sc->vbsc_cfg.vbc_geom_s = 0;
|
|
|
|
sc->vbsc_cfg.vbc_sectors_max = 0;
|
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
/*
|
|
|
|
* Should we move some of this into virtio.c? Could
|
|
|
|
* have the device, class, and subdev_0 as fields in
|
|
|
|
* the virtio constants structure.
|
|
|
|
*/
|
2011-05-13 04:54:01 +00:00
|
|
|
pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK);
|
|
|
|
pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
|
|
|
|
pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE);
|
|
|
|
pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_BLOCK);
|
2013-02-01 16:58:59 +00:00
|
|
|
|
2014-01-29 14:56:48 +00:00
|
|
|
pci_lintr_request(pi);
|
|
|
|
|
2013-10-17 22:01:17 +00:00
|
|
|
if (vi_intr_init(&sc->vbsc_vs, 1, fbsdrun_virtio_msix()))
|
2013-07-17 23:37:33 +00:00
|
|
|
return (1);
|
|
|
|
vi_set_io_bar(&sc->vbsc_vs, 0);
|
2011-05-13 04:54:01 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
static int
|
|
|
|
pci_vtblk_cfgwrite(void *vsc, int offset, int size, uint32_t value)
|
2011-05-13 04:54:01 +00:00
|
|
|
{
|
2012-10-19 18:11:17 +00:00
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
DPRINTF(("vtblk: write to readonly reg %d\n\r", offset));
|
|
|
|
return (1);
|
2011-05-13 04:54:01 +00:00
|
|
|
}
|
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
static int
|
|
|
|
pci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval)
|
2011-05-13 04:54:01 +00:00
|
|
|
{
|
2013-07-17 23:37:33 +00:00
|
|
|
struct pci_vtblk_softc *sc = vsc;
|
2011-06-07 18:35:45 +00:00
|
|
|
void *ptr;
|
2011-05-13 04:54:01 +00:00
|
|
|
|
2013-07-17 23:37:33 +00:00
|
|
|
/* our caller has already verified offset and size */
|
|
|
|
ptr = (uint8_t *)&sc->vbsc_cfg + offset;
|
|
|
|
memcpy(retval, ptr, size);
|
|
|
|
return (0);
|
2011-05-13 04:54:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
struct pci_devemu pci_de_vblk = {
|
2012-10-19 18:11:17 +00:00
|
|
|
.pe_emu = "virtio-blk",
|
|
|
|
.pe_init = pci_vtblk_init,
|
2013-07-17 23:37:33 +00:00
|
|
|
.pe_barwrite = vi_pci_write,
|
|
|
|
.pe_barread = vi_pci_read
|
2011-05-13 04:54:01 +00:00
|
|
|
};
|
|
|
|
PCI_EMUL_SET(pci_de_vblk);
|