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e2174021 HB |
1 | /* |
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 | ||
edf88417 | 19 | #include <linux/kvm_types.h> |
bda9020e | 20 | #include <asm/errno.h> |
e2174021 | 21 | |
d76685c4 | 22 | struct kvm_io_device; |
e32edf4f | 23 | struct kvm_vcpu; |
d76685c4 | 24 | |
69fa2d78 MT |
25 | /** |
26 | * kvm_io_device_ops are called under kvm slots_lock. | |
bda9020e MT |
27 | * read and write handlers return 0 if the transaction has been handled, |
28 | * or non-zero to have it passed to the next device. | |
69fa2d78 | 29 | **/ |
d76685c4 | 30 | struct kvm_io_device_ops { |
e32edf4f NN |
31 | int (*read)(struct kvm_vcpu *vcpu, |
32 | struct kvm_io_device *this, | |
bda9020e MT |
33 | gpa_t addr, |
34 | int len, | |
35 | void *val); | |
e32edf4f NN |
36 | int (*write)(struct kvm_vcpu *vcpu, |
37 | struct kvm_io_device *this, | |
e2174021 HB |
38 | gpa_t addr, |
39 | int len, | |
bda9020e | 40 | const void *val); |
e2174021 | 41 | void (*destructor)(struct kvm_io_device *this); |
d76685c4 GH |
42 | }; |
43 | ||
e2174021 | 44 | |
d76685c4 GH |
45 | struct kvm_io_device { |
46 | const struct kvm_io_device_ops *ops; | |
e2174021 HB |
47 | }; |
48 | ||
d76685c4 GH |
49 | static inline void kvm_iodevice_init(struct kvm_io_device *dev, |
50 | const struct kvm_io_device_ops *ops) | |
51 | { | |
52 | dev->ops = ops; | |
53 | } | |
54 | ||
e32edf4f NN |
55 | static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu, |
56 | struct kvm_io_device *dev, gpa_t addr, | |
57 | int l, void *v) | |
e2174021 | 58 | { |
e32edf4f NN |
59 | return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v) |
60 | : -EOPNOTSUPP; | |
e2174021 HB |
61 | } |
62 | ||
e32edf4f NN |
63 | static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu, |
64 | struct kvm_io_device *dev, gpa_t addr, | |
65 | int l, const void *v) | |
e2174021 | 66 | { |
e32edf4f NN |
67 | return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v) |
68 | : -EOPNOTSUPP; | |
e2174021 HB |
69 | } |
70 | ||
71 | static inline void kvm_iodevice_destructor(struct kvm_io_device *dev) | |
72 | { | |
d76685c4 GH |
73 | if (dev->ops->destructor) |
74 | dev->ops->destructor(dev); | |
e2174021 HB |
75 | } |
76 | ||
77 | #endif /* __KVM_IODEV_H__ */ |