2 * Copyright (c) 2011 NetApp, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/linker_set.h>
36 #include <sys/ioctl.h>
54 #define VTBLK_RINGSZ 64
56 #define VTBLK_MAXSEGS 32
59 #define VTBLK_S_IOERR 1
64 #define VTBLK_S_HOSTCAPS \
65 ( 0x00000004 | /* host maximum request segments */ \
66 VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */
69 * Config space "registers"
72 uint64_t vbc_capacity;
73 uint32_t vbc_size_max;
78 uint32_t vbc_blk_size;
79 uint32_t vbc_sectors_max;
83 * Fixed-size block header
85 struct virtio_blk_hdr {
87 #define VBH_OP_WRITE 1
88 #define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */
97 static int pci_vtblk_debug;
98 #define DPRINTF(params) if (pci_vtblk_debug) printf params
99 #define WPRINTF(params) printf params
104 struct pci_vtblk_softc {
105 struct virtio_softc vbsc_vs;
106 struct vqueue_info vbsc_vq;
108 struct vtblk_config vbsc_cfg;
111 static void pci_vtblk_reset(void *);
112 static void pci_vtblk_notify(void *, struct vqueue_info *);
113 static int pci_vtblk_cfgread(void *, int, int, uint32_t *);
114 static int pci_vtblk_cfgwrite(void *, int, int, uint32_t);
116 static struct virtio_consts vtblk_vi_consts = {
117 "vtblk", /* our name */
118 1, /* we support 1 virtqueue */
119 sizeof(struct vtblk_config), /* config reg size */
120 pci_vtblk_reset, /* reset */
121 pci_vtblk_notify, /* device-wide qnotify */
122 pci_vtblk_cfgread, /* read PCI config */
123 pci_vtblk_cfgwrite, /* write PCI config */
124 VTBLK_S_HOSTCAPS, /* our capabilities */
128 pci_vtblk_reset(void *vsc)
130 struct pci_vtblk_softc *sc = vsc;
132 DPRINTF(("vtblk: device reset requested !\n"));
133 vi_reset_dev(&sc->vbsc_vs);
137 pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq)
139 struct virtio_blk_hdr *vbh;
146 struct iovec iov[VTBLK_MAXSEGS + 2];
147 uint16_t flags[VTBLK_MAXSEGS + 2];
149 n = vq_getchain(vq, iov, VTBLK_MAXSEGS + 2, flags);
152 * The first descriptor will be the read-only fixed header,
153 * and the last is for status (hence +2 above and below).
154 * The remaining iov's are the actual data I/O vectors.
156 * XXX - note - this fails on crash dump, which does a
157 * VIRTIO_BLK_T_FLUSH with a zero transfer length
159 assert(n >= 2 && n <= VTBLK_MAXSEGS + 2);
161 assert((flags[0] & VRING_DESC_F_WRITE) == 0);
162 assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr));
163 vbh = iov[0].iov_base;
165 status = iov[--n].iov_base;
166 assert(iov[n].iov_len == 1);
167 assert(flags[n] & VRING_DESC_F_WRITE);
171 * The guest should not be setting the BARRIER flag because
172 * we don't advertise the capability.
174 type = vbh->vbh_type & ~VBH_FLAG_BARRIER;
175 writeop = (type == VBH_OP_WRITE);
177 offset = vbh->vbh_sector * DEV_BSIZE;
180 for (i = 1; i < n; i++) {
182 * - write op implies read-only descriptor,
183 * - read op implies write-only descriptor,
184 * therefore test the inverse of the descriptor bit
187 assert(((flags[i] & VRING_DESC_F_WRITE) == 0) == writeop);
188 iolen += iov[i].iov_len;
191 DPRINTF(("virtio-block: %s op, %d bytes, %d segs, offset %ld\n\r",
192 writeop ? "write" : "read", iolen, i - 1, offset));
195 err = pwritev(sc->vbsc_fd, iov + 1, i - 1, offset);
197 err = preadv(sc->vbsc_fd, iov + 1, i - 1, offset);
199 *status = err < 0 ? VTBLK_S_IOERR : VTBLK_S_OK;
202 * Return the descriptor back to the host.
203 * We wrote 1 byte (our status) to host.
209 pci_vtblk_notify(void *vsc, struct vqueue_info *vq)
211 struct pci_vtblk_softc *sc = vsc;
214 while (vq_has_descs(vq))
215 pci_vtblk_proc(sc, vq);
216 vq_endchains(vq, 1); /* Generate interrupt if appropriate. */
220 pci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
223 struct pci_vtblk_softc *sc;
231 printf("virtio-block: backing device required\n");
236 * The supplied backing file has to exist
238 fd = open(opts, O_RDWR);
240 perror("Could not open backing file");
244 if (fstat(fd, &sbuf) < 0) {
245 perror("Could not stat backing file");
251 * Deal with raw devices
255 if (S_ISCHR(sbuf.st_mode)) {
256 if (ioctl(fd, DIOCGMEDIASIZE, &size) < 0 ||
257 ioctl(fd, DIOCGSECTORSIZE, §sz)) {
258 perror("Could not fetch dev blk/sector size");
266 sc = malloc(sizeof(struct pci_vtblk_softc));
267 memset(sc, 0, sizeof(struct pci_vtblk_softc));
269 /* record fd of storage device/file */
272 /* init virtio softc and virtqueues */
273 vi_softc_linkup(&sc->vbsc_vs, &vtblk_vi_consts, sc, pi, &sc->vbsc_vq);
274 sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ;
275 /* sc->vbsc_vq.vq_notify = we have no per-queue notify */
277 /* setup virtio block config space */
278 sc->vbsc_cfg.vbc_capacity = size / sectsz;
279 sc->vbsc_cfg.vbc_seg_max = VTBLK_MAXSEGS;
280 sc->vbsc_cfg.vbc_blk_size = sectsz;
281 sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */
282 sc->vbsc_cfg.vbc_geom_c = 0; /* no geometry */
283 sc->vbsc_cfg.vbc_geom_h = 0;
284 sc->vbsc_cfg.vbc_geom_s = 0;
285 sc->vbsc_cfg.vbc_sectors_max = 0;
288 * Should we move some of this into virtio.c? Could
289 * have the device, class, and subdev_0 as fields in
290 * the virtio constants structure.
292 pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK);
293 pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
294 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE);
295 pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_BLOCK);
298 if ((env_msi = getenv("BHYVE_USE_MSI"))) {
299 if (strcasecmp(env_msi, "yes") == 0)
302 if (vi_intr_init(&sc->vbsc_vs, 1, use_msix))
304 vi_set_io_bar(&sc->vbsc_vs, 0);
309 pci_vtblk_cfgwrite(void *vsc, int offset, int size, uint32_t value)
312 DPRINTF(("vtblk: write to readonly reg %d\n\r", offset));
317 pci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval)
319 struct pci_vtblk_softc *sc = vsc;
322 /* our caller has already verified offset and size */
323 ptr = (uint8_t *)&sc->vbsc_cfg + offset;
324 memcpy(retval, ptr, size);
328 struct pci_devemu pci_de_vblk = {
329 .pe_emu = "virtio-blk",
330 .pe_init = pci_vtblk_init,
331 .pe_barwrite = vi_pci_write,
332 .pe_barread = vi_pci_read
334 PCI_EMUL_SET(pci_de_vblk);