2019-01-08 15:48:48 +01:00
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/*
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* Copyright (c) 2018 Citrix Systems Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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#include "hw/hw.h"
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#include "hw/xen/xen-block.h"
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#include "trace.h"
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2019-01-08 15:48:49 +01:00
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static char *xen_block_get_name(XenDevice *xendev, Error **errp)
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{
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XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
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XenBlockVdev *vdev = &blockdev->props.vdev;
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return g_strdup_printf("%lu", vdev->number);
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}
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2019-01-08 15:48:48 +01:00
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static void xen_block_unrealize(XenDevice *xendev, Error **errp)
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{
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XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
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XenBlockDeviceClass *blockdev_class =
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XEN_BLOCK_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(blockdev));
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XenBlockVdev *vdev = &blockdev->props.vdev;
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if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) {
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return;
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}
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trace_xen_block_unrealize(type, vdev->disk, vdev->partition);
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if (blockdev_class->unrealize) {
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blockdev_class->unrealize(blockdev, errp);
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}
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}
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static void xen_block_realize(XenDevice *xendev, Error **errp)
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{
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XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
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XenBlockDeviceClass *blockdev_class =
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XEN_BLOCK_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(blockdev));
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XenBlockVdev *vdev = &blockdev->props.vdev;
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Error *local_err = NULL;
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if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) {
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error_setg(errp, "vdev property not set");
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return;
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}
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trace_xen_block_realize(type, vdev->disk, vdev->partition);
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if (blockdev_class->realize) {
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blockdev_class->realize(blockdev, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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}
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}
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}
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static char *disk_to_vbd_name(unsigned int disk)
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{
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char *name, *prefix = (disk >= 26) ?
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disk_to_vbd_name((disk / 26) - 1) : g_strdup("");
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name = g_strdup_printf("%s%c", prefix, 'a' + disk % 26);
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g_free(prefix);
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return name;
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}
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static void xen_block_get_vdev(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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DeviceState *dev = DEVICE(obj);
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Property *prop = opaque;
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XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop);
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char *str;
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switch (vdev->type) {
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case XEN_BLOCK_VDEV_TYPE_DP:
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str = g_strdup_printf("d%lup%lu", vdev->disk, vdev->partition);
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break;
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case XEN_BLOCK_VDEV_TYPE_XVD:
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case XEN_BLOCK_VDEV_TYPE_HD:
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case XEN_BLOCK_VDEV_TYPE_SD: {
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char *name = disk_to_vbd_name(vdev->disk);
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str = g_strdup_printf("%s%s%lu",
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(vdev->type == XEN_BLOCK_VDEV_TYPE_XVD) ?
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"xvd" :
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(vdev->type == XEN_BLOCK_VDEV_TYPE_HD) ?
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"hd" :
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"sd",
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name, vdev->partition);
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g_free(name);
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break;
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}
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default:
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error_setg(errp, "invalid vdev type");
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return;
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}
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visit_type_str(v, name, &str, errp);
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g_free(str);
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}
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static unsigned int vbd_name_to_disk(const char *name, const char **endp)
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{
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unsigned int disk = 0;
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while (*name != '\0') {
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if (!g_ascii_isalpha(*name) || !g_ascii_islower(*name)) {
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break;
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}
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disk *= 26;
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disk += *name++ - 'a' + 1;
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}
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*endp = name;
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return disk - 1;
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}
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static void xen_block_set_vdev(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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DeviceState *dev = DEVICE(obj);
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Property *prop = opaque;
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XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop);
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Error *local_err = NULL;
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char *str, *p;
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const char *end;
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if (dev->realized) {
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qdev_prop_set_after_realize(dev, name, errp);
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return;
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}
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visit_type_str(v, name, &str, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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p = strchr(str, 'd');
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if (!p) {
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goto invalid;
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}
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*p++ = '\0';
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if (*str == '\0') {
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vdev->type = XEN_BLOCK_VDEV_TYPE_DP;
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} else if (strcmp(str, "xv") == 0) {
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vdev->type = XEN_BLOCK_VDEV_TYPE_XVD;
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} else if (strcmp(str, "h") == 0) {
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vdev->type = XEN_BLOCK_VDEV_TYPE_HD;
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} else if (strcmp(str, "s") == 0) {
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vdev->type = XEN_BLOCK_VDEV_TYPE_SD;
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} else {
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goto invalid;
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}
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if (vdev->type == XEN_BLOCK_VDEV_TYPE_DP) {
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if (qemu_strtoul(p, &end, 10, &vdev->disk)) {
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goto invalid;
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}
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if (*end == 'p') {
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p = (char *) ++end;
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if (*end == '\0') {
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goto invalid;
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}
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}
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} else {
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vdev->disk = vbd_name_to_disk(p, &end);
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}
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if (*end != '\0') {
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p = (char *)end;
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if (qemu_strtoul(p, &end, 10, &vdev->partition)) {
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goto invalid;
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}
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if (*end != '\0') {
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goto invalid;
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}
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} else {
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vdev->partition = 0;
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}
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switch (vdev->type) {
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case XEN_BLOCK_VDEV_TYPE_DP:
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case XEN_BLOCK_VDEV_TYPE_XVD:
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if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) {
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vdev->number = (202 << 8) | (vdev->disk << 4) |
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vdev->partition;
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} else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) {
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vdev->number = (1 << 28) | (vdev->disk << 8) |
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vdev->partition;
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} else {
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goto invalid;
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}
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break;
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case XEN_BLOCK_VDEV_TYPE_HD:
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if ((vdev->disk == 0 || vdev->disk == 1) &&
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vdev->partition < (1 << 6)) {
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vdev->number = (3 << 8) | (vdev->disk << 6) | vdev->partition;
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} else if ((vdev->disk == 2 || vdev->disk == 3) &&
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vdev->partition < (1 << 6)) {
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vdev->number = (22 << 8) | ((vdev->disk - 2) << 6) |
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vdev->partition;
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} else {
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goto invalid;
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}
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break;
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case XEN_BLOCK_VDEV_TYPE_SD:
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if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) {
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vdev->number = (8 << 8) | (vdev->disk << 4) | vdev->partition;
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} else {
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goto invalid;
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}
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break;
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default:
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goto invalid;
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}
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g_free(str);
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return;
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invalid:
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error_setg(errp, "invalid virtual disk specifier");
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vdev->type = XEN_BLOCK_VDEV_TYPE_INVALID;
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g_free(str);
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}
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/*
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* This property deals with 'vdev' names adhering to the Xen VBD naming
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* scheme described in:
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*
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* https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html
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*/
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const PropertyInfo xen_block_prop_vdev = {
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.name = "str",
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.description = "Virtual Disk specifier: d*p*/xvd*/hd*/sd*",
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.get = xen_block_get_vdev,
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.set = xen_block_set_vdev,
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};
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static Property xen_block_props[] = {
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DEFINE_PROP("vdev", XenBlockDevice, props.vdev,
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xen_block_prop_vdev, XenBlockVdev),
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DEFINE_PROP_END_OF_LIST()
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};
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static void xen_block_class_init(ObjectClass *class, void *data)
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{
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DeviceClass *dev_class = DEVICE_CLASS(class);
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XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class);
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2019-01-08 15:48:49 +01:00
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xendev_class->get_name = xen_block_get_name;
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2019-01-08 15:48:48 +01:00
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xendev_class->realize = xen_block_realize;
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xendev_class->unrealize = xen_block_unrealize;
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dev_class->props = xen_block_props;
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}
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static const TypeInfo xen_block_type_info = {
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.name = TYPE_XEN_BLOCK_DEVICE,
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.parent = TYPE_XEN_DEVICE,
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.instance_size = sizeof(XenBlockDevice),
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.abstract = true,
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.class_size = sizeof(XenBlockDeviceClass),
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.class_init = xen_block_class_init,
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};
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static void xen_disk_unrealize(XenBlockDevice *blockdev, Error **errp)
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{
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trace_xen_disk_unrealize();
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}
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static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp)
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{
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trace_xen_disk_realize();
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}
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static void xen_disk_class_init(ObjectClass *class, void *data)
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{
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DeviceClass *dev_class = DEVICE_CLASS(class);
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XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class);
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blockdev_class->realize = xen_disk_realize;
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blockdev_class->unrealize = xen_disk_unrealize;
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dev_class->desc = "Xen Disk Device";
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}
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static const TypeInfo xen_disk_type_info = {
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.name = TYPE_XEN_DISK_DEVICE,
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.parent = TYPE_XEN_BLOCK_DEVICE,
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.instance_size = sizeof(XenDiskDevice),
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.class_init = xen_disk_class_init,
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};
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static void xen_cdrom_unrealize(XenBlockDevice *blockdev, Error **errp)
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{
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trace_xen_cdrom_unrealize();
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}
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static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp)
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{
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trace_xen_cdrom_realize();
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}
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static void xen_cdrom_class_init(ObjectClass *class, void *data)
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{
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DeviceClass *dev_class = DEVICE_CLASS(class);
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XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class);
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blockdev_class->realize = xen_cdrom_realize;
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blockdev_class->unrealize = xen_cdrom_unrealize;
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dev_class->desc = "Xen CD-ROM Device";
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}
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static const TypeInfo xen_cdrom_type_info = {
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.name = TYPE_XEN_CDROM_DEVICE,
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.parent = TYPE_XEN_BLOCK_DEVICE,
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.instance_size = sizeof(XenCDRomDevice),
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.class_init = xen_cdrom_class_init,
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};
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static void xen_block_register_types(void)
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{
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type_register_static(&xen_block_type_info);
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type_register_static(&xen_disk_type_info);
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type_register_static(&xen_cdrom_type_info);
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}
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type_init(xen_block_register_types)
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