blob: 12fd3caffd2b7b3c8a794fee57d5f6e38df25de4 [file] [log] [blame]
Hollis Blancharde2174022007-12-03 15:30:24 -06001/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
14 */
15
16#ifndef __KVM_IODEV_H__
17#define __KVM_IODEV_H__
18
Avi Kivityedf88412007-12-16 11:02:48 +020019#include <linux/kvm_types.h>
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030020#include <asm/errno.h>
Hollis Blancharde2174022007-12-03 15:30:24 -060021
Gregory Haskinsd76685c42009-06-01 12:54:50 -040022struct kvm_io_device;
23
Michael S. Tsirkin69fa2d72009-06-29 22:24:07 +030024/**
25 * kvm_io_device_ops are called under kvm slots_lock.
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030026 * read and write handlers return 0 if the transaction has been handled,
27 * or non-zero to have it passed to the next device.
Michael S. Tsirkin69fa2d72009-06-29 22:24:07 +030028 **/
Gregory Haskinsd76685c42009-06-01 12:54:50 -040029struct kvm_io_device_ops {
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030030 int (*read)(struct kvm_io_device *this,
31 gpa_t addr,
32 int len,
33 void *val);
34 int (*write)(struct kvm_io_device *this,
Hollis Blancharde2174022007-12-03 15:30:24 -060035 gpa_t addr,
36 int len,
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030037 const void *val);
Hollis Blancharde2174022007-12-03 15:30:24 -060038 void (*destructor)(struct kvm_io_device *this);
Hollis Blancharde2174022007-12-03 15:30:24 -060039};
40
Gregory Haskinsd76685c42009-06-01 12:54:50 -040041
42struct kvm_io_device {
43 const struct kvm_io_device_ops *ops;
44};
45
46static inline void kvm_iodevice_init(struct kvm_io_device *dev,
47 const struct kvm_io_device_ops *ops)
48{
49 dev->ops = ops;
50}
51
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030052static inline int kvm_iodevice_read(struct kvm_io_device *dev,
53 gpa_t addr, int l, void *v)
Hollis Blancharde2174022007-12-03 15:30:24 -060054{
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030055 return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
Hollis Blancharde2174022007-12-03 15:30:24 -060056}
57
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030058static inline int kvm_iodevice_write(struct kvm_io_device *dev,
59 gpa_t addr, int l, const void *v)
Hollis Blancharde2174022007-12-03 15:30:24 -060060{
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030061 return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP;
Hollis Blancharde2174022007-12-03 15:30:24 -060062}
63
64static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
65{
Gregory Haskinsd76685c42009-06-01 12:54:50 -040066 if (dev->ops->destructor)
67 dev->ops->destructor(dev);
Hollis Blancharde2174022007-12-03 15:30:24 -060068}
69
70#endif /* __KVM_IODEV_H__ */