[deliverable/linux.git] / drivers / xen / events / events_internal.h

/*
 * Xen Event Channels (internal header)
 *
 * Copyright (C) 2013 Citrix Systems R&D Ltd.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2 or later.  See the file COPYING for more details.
 */
#ifndef __EVENTS_INTERNAL_H__
#define __EVENTS_INTERNAL_H__

/* Interrupt types. */
enum xen_irq_type {
	IRQT_UNBOUND = 0,
	IRQT_PIRQ,
	IRQT_VIRQ,
	IRQT_IPI,
	IRQT_EVTCHN
};

/*
 * Packed IRQ information:
 * type - enum xen_irq_type
 * event channel - irq->event channel mapping
 * cpu - cpu this event channel is bound to
 * index - type-specific information:
 *    PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
 *           guest, or GSI (real passthrough IRQ) of the device.
 *    VIRQ - virq number
 *    IPI - IPI vector
 *    EVTCHN -
 */
struct irq_info {
	struct list_head list;
	int refcnt;
	enum xen_irq_type type;	/* type */
	unsigned irq;
	unsigned int evtchn;	/* event channel */
	unsigned short cpu;	/* cpu bound */

	union {
		unsigned short virq;
		enum ipi_vector ipi;
		struct {
			unsigned short pirq;
			unsigned short gsi;
			unsigned char vector;
			unsigned char flags;
			uint16_t domid;
		} pirq;
	} u;
};

#define PIRQ_NEEDS_EOI	(1 << 0)
#define PIRQ_SHAREABLE	(1 << 1)

struct evtchn_ops {
	unsigned (*max_channels)(void);
	unsigned (*nr_channels)(void);

	int (*setup)(struct irq_info *info);
	void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);

	void (*clear_pending)(unsigned port);
	void (*set_pending)(unsigned port);
	bool (*is_pending)(unsigned port);
	bool (*test_and_set_mask)(unsigned port);
	void (*mask)(unsigned port);
	void (*unmask)(unsigned port);

	void (*handle_events)(unsigned cpu);
};

extern const struct evtchn_ops *evtchn_ops;

extern int **evtchn_to_irq;
int get_evtchn_to_irq(unsigned int evtchn);

struct irq_info *info_for_irq(unsigned irq);
unsigned cpu_from_irq(unsigned irq);
unsigned cpu_from_evtchn(unsigned int evtchn);

static inline unsigned xen_evtchn_max_channels(void)
{
	return evtchn_ops->max_channels();
}

/*
 * Do any ABI specific setup for a bound event channel before it can
 * be unmasked and used.
 */
static inline int xen_evtchn_port_setup(struct irq_info *info)
{
	if (evtchn_ops->setup)
		return evtchn_ops->setup(info);
	return 0;
}

static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
					       unsigned cpu)
{
	evtchn_ops->bind_to_cpu(info, cpu);
}

static inline void clear_evtchn(unsigned port)
{
	evtchn_ops->clear_pending(port);
}

static inline void set_evtchn(unsigned port)
{
	evtchn_ops->set_pending(port);
}

static inline bool test_evtchn(unsigned port)
{
	return evtchn_ops->is_pending(port);
}

static inline bool test_and_set_mask(unsigned port)
{
	return evtchn_ops->test_and_set_mask(port);
}

static inline void mask_evtchn(unsigned port)
{
	return evtchn_ops->mask(port);
}

static inline void unmask_evtchn(unsigned port)
{
	return evtchn_ops->unmask(port);
}

static inline void xen_evtchn_handle_events(unsigned cpu)
{
	return evtchn_ops->handle_events(cpu);
}

void xen_evtchn_2l_init(void);

#endif /* #ifndef __EVENTS_INTERNAL_H__ */
Commit	Line	Data
9a489f45 DV	1	/*
	2	* Xen Event Channels (internal header)
	3	*
	4	* Copyright (C) 2013 Citrix Systems R&D Ltd.
	5	*
	6	* This source code is licensed under the GNU General Public License,
	7	* Version 2 or later. See the file COPYING for more details.
	8	*/
	9	#ifndef __EVENTS_INTERNAL_H__
	10	#define __EVENTS_INTERNAL_H__
	11
	12	/* Interrupt types. */
	13	enum xen_irq_type {
	14	IRQT_UNBOUND = 0,
	15	IRQT_PIRQ,
	16	IRQT_VIRQ,
	17	IRQT_IPI,
	18	IRQT_EVTCHN
	19	};
	20
	21	/*
	22	* Packed IRQ information:
	23	* type - enum xen_irq_type
	24	* event channel - irq->event channel mapping
	25	* cpu - cpu this event channel is bound to
	26	* index - type-specific information:
	27	* PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
	28	* guest, or GSI (real passthrough IRQ) of the device.
	29	* VIRQ - virq number
	30	* IPI - IPI vector
	31	* EVTCHN -
	32	*/
	33	struct irq_info {
	34	struct list_head list;
	35	int refcnt;
	36	enum xen_irq_type type; /* type */
	37	unsigned irq;
d0b075ff	38	unsigned int evtchn; /* event channel */
9a489f45 DV	39	unsigned short cpu; /* cpu bound */
	40
	41	union {
	42	unsigned short virq;
	43	enum ipi_vector ipi;
	44	struct {
	45	unsigned short pirq;
	46	unsigned short gsi;
	47	unsigned char vector;
	48	unsigned char flags;
	49	uint16_t domid;
	50	} pirq;
	51	} u;
	52	};
	53
	54	#define PIRQ_NEEDS_EOI (1 << 0)
	55	#define PIRQ_SHAREABLE (1 << 1)
	56
ab9a1cca	57	struct evtchn_ops {
d0b075ff DV	58	unsigned (*max_channels)(void);
	59	unsigned (*nr_channels)(void);
	60
08385875	61	int (setup)(struct irq_info info);
ab9a1cca DV	62	void (bind_to_cpu)(struct irq_info info, unsigned cpu);
	63
	64	void (*clear_pending)(unsigned port);
	65	void (*set_pending)(unsigned port);
	66	bool (*is_pending)(unsigned port);
	67	bool (*test_and_set_mask)(unsigned port);
	68	void (*mask)(unsigned port);
	69	void (*unmask)(unsigned port);
	70
	71	void (*handle_events)(unsigned cpu);
	72	};
	73
	74	extern const struct evtchn_ops *evtchn_ops;
	75
d0b075ff DV	76	extern int **evtchn_to_irq;
d0b075ff DV	77	int get_evtchn_to_irq(unsigned int evtchn);
9a489f45 DV	78
	79	struct irq_info *info_for_irq(unsigned irq);
	80	unsigned cpu_from_irq(unsigned irq);
	81	unsigned cpu_from_evtchn(unsigned int evtchn);
	82
d0b075ff DV	83	static inline unsigned xen_evtchn_max_channels(void)
	84	{
	85	return evtchn_ops->max_channels();
	86	}
	87
08385875 DV	88	/*
	89	* Do any ABI specific setup for a bound event channel before it can
	90	* be unmasked and used.
	91	*/
	92	static inline int xen_evtchn_port_setup(struct irq_info *info)
	93	{
	94	if (evtchn_ops->setup)
	95	return evtchn_ops->setup(info);
	96	return 0;
	97	}
	98
ab9a1cca DV	99	static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
	100	unsigned cpu)
	101	{
	102	evtchn_ops->bind_to_cpu(info, cpu);
	103	}
	104
	105	static inline void clear_evtchn(unsigned port)
	106	{
	107	evtchn_ops->clear_pending(port);
	108	}
	109
	110	static inline void set_evtchn(unsigned port)
	111	{
	112	evtchn_ops->set_pending(port);
	113	}
	114
	115	static inline bool test_evtchn(unsigned port)
	116	{
	117	return evtchn_ops->is_pending(port);
	118	}
	119
	120	static inline bool test_and_set_mask(unsigned port)
	121	{
	122	return evtchn_ops->test_and_set_mask(port);
	123	}
	124
	125	static inline void mask_evtchn(unsigned port)
	126	{
	127	return evtchn_ops->mask(port);
	128	}
	129
	130	static inline void unmask_evtchn(unsigned port)
	131	{
	132	return evtchn_ops->unmask(port);
	133	}
9a489f45	134
ab9a1cca DV	135	static inline void xen_evtchn_handle_events(unsigned cpu)
	136	{
	137	return evtchn_ops->handle_events(cpu);
	138	}
9a489f45	139
ab9a1cca	140	void xen_evtchn_2l_init(void);
9a489f45 DV	141
9a489f45 DV	142	#endif /* #ifndef __EVENTS_INTERNAL_H__ */