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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
Andre Przywaraaf669ac2015-03-26 14:39:29 +000012 * along with this program. If not, see <http://www.gnu.org/licenses/>.
Hollis Blancharde2174022007-12-03 15:30:24 -060013 */
14
15#ifndef __KVM_IODEV_H__
16#define __KVM_IODEV_H__
17
Avi Kivityedf88412007-12-16 11:02:48 +020018#include <linux/kvm_types.h>
Andre Przywaraaf669ac2015-03-26 14:39:29 +000019#include <linux/errno.h>
Hollis Blancharde2174022007-12-03 15:30:24 -060020
Gregory Haskinsd76685c2009-06-01 12:54:50 -040021struct kvm_io_device;
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000022struct kvm_vcpu;
Gregory Haskinsd76685c2009-06-01 12:54:50 -040023
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 Haskinsd76685c2009-06-01 12:54:50 -040029struct kvm_io_device_ops {
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000030 int (*read)(struct kvm_vcpu *vcpu,
31 struct kvm_io_device *this,
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030032 gpa_t addr,
33 int len,
34 void *val);
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000035 int (*write)(struct kvm_vcpu *vcpu,
36 struct kvm_io_device *this,
Hollis Blancharde2174022007-12-03 15:30:24 -060037 gpa_t addr,
38 int len,
Michael S. Tsirkinbda90202009-06-29 22:24:32 +030039 const void *val);
Hollis Blancharde2174022007-12-03 15:30:24 -060040 void (*destructor)(struct kvm_io_device *this);
Hollis Blancharde2174022007-12-03 15:30:24 -060041};
42
Gregory Haskinsd76685c2009-06-01 12:54:50 -040043
44struct kvm_io_device {
45 const struct kvm_io_device_ops *ops;
46};
47
48static inline void kvm_iodevice_init(struct kvm_io_device *dev,
49 const struct kvm_io_device_ops *ops)
50{
51 dev->ops = ops;
52}
53
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000054static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu,
55 struct kvm_io_device *dev, gpa_t addr,
56 int l, void *v)
Hollis Blancharde2174022007-12-03 15:30:24 -060057{
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000058 return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
59 : -EOPNOTSUPP;
Hollis Blancharde2174022007-12-03 15:30:24 -060060}
61
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000062static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,
63 struct kvm_io_device *dev, gpa_t addr,
64 int l, const void *v)
Hollis Blancharde2174022007-12-03 15:30:24 -060065{
Nikolay Nikolaeve32edf42015-03-26 14:39:28 +000066 return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
67 : -EOPNOTSUPP;
Hollis Blancharde2174022007-12-03 15:30:24 -060068}
69
70static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
71{
Gregory Haskinsd76685c2009-06-01 12:54:50 -040072 if (dev->ops->destructor)
73 dev->ops->destructor(dev);
Hollis Blancharde2174022007-12-03 15:30:24 -060074}
75
76#endif /* __KVM_IODEV_H__ */