[deliverable/linux.git] / include / kvm / iodev.h

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __KVM_IODEV_H__
#define __KVM_IODEV_H__

#include <linux/kvm_types.h>
#include <linux/errno.h>

struct kvm_io_device;
struct kvm_vcpu;

/**
 * kvm_io_device_ops are called under kvm slots_lock.
 * read and write handlers return 0 if the transaction has been handled,
 * or non-zero to have it passed to the next device.
 **/
struct kvm_io_device_ops {
	int (*read)(struct kvm_vcpu *vcpu,
		    struct kvm_io_device *this,
		    gpa_t addr,
		    int len,
		    void *val);
	int (*write)(struct kvm_vcpu *vcpu,
		     struct kvm_io_device *this,
		     gpa_t addr,
		     int len,
		     const void *val);
	void (*destructor)(struct kvm_io_device *this);
};


struct kvm_io_device {
	const struct kvm_io_device_ops *ops;
};

static inline void kvm_iodevice_init(struct kvm_io_device *dev,
				     const struct kvm_io_device_ops *ops)
{
	dev->ops = ops;
}

static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu,
				    struct kvm_io_device *dev, gpa_t addr,
				    int l, void *v)
{
	return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
				: -EOPNOTSUPP;
}

static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,
				     struct kvm_io_device *dev, gpa_t addr,
				     int l, const void *v)
{
	return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
				 : -EOPNOTSUPP;
}

static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
{
	if (dev->ops->destructor)
		dev->ops->destructor(dev);
}

#endif /* __KVM_IODEV_H__ */
Commit	Line	Data
	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, see <http://www.gnu.org/licenses/>.
	13	*/
	14
	15	#ifndef __KVM_IODEV_H__
	16	#define __KVM_IODEV_H__
	17
	18	#include <linux/kvm_types.h>
	19	#include <linux/errno.h>
	20
	21	struct kvm_io_device;
	22	struct kvm_vcpu;
	23
	24	/**
	25	* kvm_io_device_ops are called under kvm slots_lock.
	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.
	28	**/
	29	struct kvm_io_device_ops {
	30	int (read)(struct kvm_vcpu vcpu,
	31	struct kvm_io_device *this,
	32	gpa_t addr,
	33	int len,
	34	void *val);
	35	int (write)(struct kvm_vcpu vcpu,
	36	struct kvm_io_device *this,
	37	gpa_t addr,
	38	int len,
	39	const void *val);
	40	void (destructor)(struct kvm_io_device this);
	41	};
	42
	43
	44	struct kvm_io_device {
	45	const struct kvm_io_device_ops *ops;
	46	};
	47
	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
	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)
	57	{
	58	return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
	59	: -EOPNOTSUPP;
	60	}
	61
	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)
	65	{
	66	return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
	67	: -EOPNOTSUPP;
	68	}
	69
	70	static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
	71	{
	72	if (dev->ops->destructor)
	73	dev->ops->destructor(dev);
	74	}
	75
	76	#endif /* __KVM_IODEV_H__ */