diff options
Diffstat (limited to 'sys/amd64/vmm/io/vdev.c')
| -rw-r--r-- | sys/amd64/vmm/io/vdev.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/sys/amd64/vmm/io/vdev.c b/sys/amd64/vmm/io/vdev.c new file mode 100644 index 0000000..cd6c5d1 --- /dev/null +++ b/sys/amd64/vmm/io/vdev.c @@ -0,0 +1,270 @@ +/*- + * Copyright (c) 2011 NetApp, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/malloc.h> + +#include "vdev.h" + +struct vdev { + SLIST_ENTRY(vdev) entry; + struct vdev_ops *ops; + void *dev; +}; +static SLIST_HEAD(, vdev) vdev_head; +static int vdev_count; + +struct vdev_region { + SLIST_ENTRY(vdev_region) entry; + struct vdev_ops *ops; + void *dev; + struct io_region *io; +}; +static SLIST_HEAD(, vdev_region) region_head; +static int region_count; + +static MALLOC_DEFINE(M_VDEV, "vdev", "vdev"); + +#define VDEV_INIT (0) +#define VDEV_RESET (1) +#define VDEV_HALT (2) + +// static const char* vdev_event_str[] = {"VDEV_INIT", "VDEV_RESET", "VDEV_HALT"}; + +static int +vdev_system_event(int event) +{ + struct vdev *vd; + int rc; + + // TODO: locking + SLIST_FOREACH(vd, &vdev_head, entry) { + // printf("%s : %s Device %s\n", __func__, vdev_event_str[event], vd->ops->name); + switch (event) { + case VDEV_INIT: + rc = vd->ops->init(vd->dev); + break; + case VDEV_RESET: + rc = vd->ops->reset(vd->dev); + break; + case VDEV_HALT: + rc = vd->ops->halt(vd->dev); + break; + default: + break; + } + if (rc) { + printf("vdev %s init failed rc=%d\n", + vd->ops->name, rc); + return rc; + } + } + return 0; +} + +int +vdev_init(void) +{ + return vdev_system_event(VDEV_INIT); +} + +int +vdev_reset(void) +{ + return vdev_system_event(VDEV_RESET); +} + +int +vdev_halt(void) +{ + return vdev_system_event(VDEV_HALT); +} + +void +vdev_vm_init(void) +{ + SLIST_INIT(&vdev_head); + vdev_count = 0; + + SLIST_INIT(®ion_head); + region_count = 0; +} +void +vdev_vm_cleanup(void) +{ + struct vdev *vd; + + // TODO: locking + while (!SLIST_EMPTY(&vdev_head)) { + vd = SLIST_FIRST(&vdev_head); + SLIST_REMOVE_HEAD(&vdev_head, entry); + free(vd, M_VDEV); + vdev_count--; + } +} + +int +vdev_register(struct vdev_ops *ops, void *dev) +{ + struct vdev *vd; + vd = malloc(sizeof(*vd), M_VDEV, M_WAITOK | M_ZERO); + vd->ops = ops; + vd->dev = dev; + + // TODO: locking + SLIST_INSERT_HEAD(&vdev_head, vd, entry); + vdev_count++; + return 0; +} + +void +vdev_unregister(void *dev) +{ + struct vdev *vd, *found; + + found = NULL; + // TODO: locking + SLIST_FOREACH(vd, &vdev_head, entry) { + if (vd->dev == dev) { + found = vd; + } + } + + if (found) { + SLIST_REMOVE(&vdev_head, found, vdev, entry); + free(found, M_VDEV); + } +} + +#define IN_RANGE(val, start, end) \ + (((val) >= (start)) && ((val) < (end))) + +static struct vdev_region* +vdev_find_region(struct io_region *io, void *dev) +{ + struct vdev_region *region, *found; + uint64_t region_base; + uint64_t region_end; + + found = NULL; + + // TODO: locking + // FIXME: we should verify we are in the context the current + // vcpu here as well. + SLIST_FOREACH(region, ®ion_head, entry) { + region_base = region->io->base; + region_end = region_base + region->io->len; + if (IN_RANGE(io->base, region_base, region_end) && + IN_RANGE(io->base+io->len, region_base, region_end+1) && + (dev && dev == region->dev)) { + found = region; + break; + } + } + return found; +} + +int +vdev_register_region(struct vdev_ops *ops, void *dev, struct io_region *io) +{ + struct vdev_region *region; + + region = vdev_find_region(io, dev); + if (region) { + return -EEXIST; + } + + region = malloc(sizeof(*region), M_VDEV, M_WAITOK | M_ZERO); + region->io = io; + region->ops = ops; + region->dev = dev; + + // TODO: locking + SLIST_INSERT_HEAD(®ion_head, region, entry); + region_count++; + + return 0; +} + +void +vdev_unregister_region(void *dev, struct io_region *io) +{ + struct vdev_region *region; + + region = vdev_find_region(io, dev); + + if (region) { + SLIST_REMOVE(®ion_head, region, vdev_region, entry); + free(region, M_VDEV); + region_count--; + } +} + +static int +vdev_memrw(uint64_t gpa, opsize_t size, uint64_t *data, int read) +{ + struct vdev_region *region; + struct io_region io; + region_attr_t attr; + int rc; + + io.base = gpa; + io.len = size; + + region = vdev_find_region(&io, NULL); + if (!region) + return -EINVAL; + + attr = (read) ? MMIO_READ : MMIO_WRITE; + if (!(region->io->attr & attr)) + return -EPERM; + + if (read) + rc = region->ops->memread(region->dev, gpa, size, data); + else + rc = region->ops->memwrite(region->dev, gpa, size, *data); + + return rc; +} + +int +vdev_memread(uint64_t gpa, opsize_t size, uint64_t *data) +{ + return vdev_memrw(gpa, size, data, 1); +} + +int +vdev_memwrite(uint64_t gpa, opsize_t size, uint64_t data) +{ + return vdev_memrw(gpa, size, &data, 0); +} |
