[GitHub/mt8127/android_kernel_alcatel_ttab.git] / virt / 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, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef __KVM_IODEV_H__
#define __KVM_IODEV_H__

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

struct kvm_io_device;

/**
 * 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_io_device *this,
		    gpa_t addr,
		    int len,
		    void *val);
	int (*write)(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_io_device *dev,
				    gpa_t addr, int l, void *v)
{
	return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
}

static inline int kvm_iodevice_write(struct kvm_io_device *dev,
				     gpa_t addr, int l, const void *v)
{
	return dev->ops->write ? dev->ops->write(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
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 GH	22	struct kvm_io_device;
d76685c4 GH	23
69fa2d78 MT	24	/**
69fa2d78 MT	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,
bda9020e MT	27	* or non-zero to have it passed to the next device.
69fa2d78	28	**/
d76685c4	29	struct kvm_io_device_ops {
bda9020e MT	30	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,
e2174021 HB	35	gpa_t addr,
e2174021 HB	36	int len,
bda9020e	37	const void *val);
e2174021	38	void (destructor)(struct kvm_io_device this);
d76685c4 GH	39	};
d76685c4 GH	40
e2174021	41
d76685c4 GH	42	struct kvm_io_device {
d76685c4 GH	43	const struct kvm_io_device_ops *ops;
e2174021 HB	44	};
e2174021 HB	45
d76685c4 GH	46	static 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
bda9020e MT	52	static inline int kvm_iodevice_read(struct kvm_io_device *dev,
bda9020e MT	53	gpa_t addr, int l, void *v)
e2174021	54	{
bda9020e	55	return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
e2174021 HB	56	}
e2174021 HB	57
bda9020e MT	58	static inline int kvm_iodevice_write(struct kvm_io_device *dev,
bda9020e MT	59	gpa_t addr, int l, const void *v)
e2174021	60	{
bda9020e	61	return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP;
e2174021 HB	62	}
	63
	64	static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
	65	{
d76685c4 GH	66	if (dev->ops->destructor)
d76685c4 GH	67	dev->ops->destructor(dev);
e2174021 HB	68	}
	69
	70	#endif /* __KVM_IODEV_H__ */