projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| af669ac6 | 12 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| e2174021 HB |
13 | */ |
| 14 | ||
| 15 | #ifndef __KVM_IODEV_H__ | |
| 16 | #define __KVM_IODEV_H__ | |
| 17 | ||
| edf88417 | 18 | #include <linux/kvm_types.h> |
| af669ac6 | 19 | #include <linux/errno.h> |
| e2174021 | 20 | |
| d76685c4 | 21 | struct kvm_io_device; |
| e32edf4f | 22 | struct kvm_vcpu; |
| d76685c4 | 23 | |
| 69fa2d78 MT |
24 | /** |
| 25 | * kvm_io_device_ops are called under kvm slots_lock. | |
| bda9020e MT |
26 | * read and write handlers return 0 if the transaction has been handled, |
| 27 | * or non-zero to have it passed to the next device. | |
| 69fa2d78 | 28 | **/ |
| d76685c4 | 29 | struct kvm_io_device_ops { |
| e32edf4f NN |
30 | int (*read)(struct kvm_vcpu *vcpu, |
| 31 | struct kvm_io_device *this, | |
| bda9020e MT |
32 | gpa_t addr, |
| 33 | int len, | |
| 34 | void *val); | |
| e32edf4f NN |
35 | int (*write)(struct kvm_vcpu *vcpu, |
| 36 | struct kvm_io_device *this, | |
| e2174021 HB |
37 | gpa_t addr, |
| 38 | int len, | |
| bda9020e | 39 | const void *val); |
| e2174021 | 40 | void (*destructor)(struct kvm_io_device *this); |
| d76685c4 GH |
41 | }; |
| 42 | ||
| e2174021 | 43 | |
| d76685c4 GH |
44 | struct kvm_io_device { |
| 45 | const struct kvm_io_device_ops *ops; | |
| e2174021 HB |
46 | }; |
| 47 | ||
| d76685c4 GH |
48 | static 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 | ||
| e32edf4f NN |
54 | static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu, |
| 55 | struct kvm_io_device *dev, gpa_t addr, | |
| 56 | int l, void *v) | |
| e2174021 | 57 | { |
| e32edf4f NN |
58 | return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v) |
| 59 | : -EOPNOTSUPP; | |
| e2174021 HB |
60 | } |
| 61 | ||
| e32edf4f NN |
62 | static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu, |
| 63 | struct kvm_io_device *dev, gpa_t addr, | |
| 64 | int l, const void *v) | |
| e2174021 | 65 | { |
| e32edf4f NN |
66 | return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v) |
| 67 | : -EOPNOTSUPP; | |
| e2174021 HB |
68 | } |
| 69 | ||
| 70 | static inline void kvm_iodevice_destructor(struct kvm_io_device *dev) | |
| 71 | { | |
| d76685c4 GH |
72 | if (dev->ops->destructor) |
| 73 | dev->ops->destructor(dev); | |
| e2174021 HB |
74 | } |
| 75 | ||
| 76 | #endif /* __KVM_IODEV_H__ */ |