172 lines
4 KiB
C
172 lines
4 KiB
C
/*
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* Xen Event Channels (internal header)
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*
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* Copyright (C) 2013 Citrix Systems R&D Ltd.
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2 or later. See the file COPYING for more details.
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*/
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#ifndef __EVENTS_INTERNAL_H__
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#define __EVENTS_INTERNAL_H__
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/* Interrupt types. */
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enum xen_irq_type {
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IRQT_UNBOUND = 0,
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IRQT_PIRQ,
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IRQT_VIRQ,
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IRQT_IPI,
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IRQT_EVTCHN
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};
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/*
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* Packed IRQ information:
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* type - enum xen_irq_type
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* event channel - irq->event channel mapping
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* cpu - cpu this event channel is bound to
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* index - type-specific information:
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* PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
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* guest, or GSI (real passthrough IRQ) of the device.
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* VIRQ - virq number
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* IPI - IPI vector
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* EVTCHN -
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*/
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struct irq_info {
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struct list_head list;
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struct list_head eoi_list;
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short refcnt;
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short spurious_cnt;
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short type; /* type */
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u8 mask_reason; /* Why is event channel masked */
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#define EVT_MASK_REASON_EXPLICIT 0x01
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#define EVT_MASK_REASON_TEMPORARY 0x02
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#define EVT_MASK_REASON_EOI_PENDING 0x04
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u8 is_active; /* Is event just being handled? */
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unsigned irq;
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unsigned int evtchn; /* event channel */
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unsigned short cpu; /* cpu bound */
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unsigned short eoi_cpu; /* EOI must happen on this cpu */
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unsigned int irq_epoch; /* If eoi_cpu valid: irq_epoch of event */
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u64 eoi_time; /* Time in jiffies when to EOI. */
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raw_spinlock_t lock;
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union {
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unsigned short virq;
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enum ipi_vector ipi;
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struct {
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unsigned short pirq;
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unsigned short gsi;
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unsigned char vector;
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unsigned char flags;
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uint16_t domid;
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} pirq;
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} u;
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};
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#define PIRQ_NEEDS_EOI (1 << 0)
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#define PIRQ_SHAREABLE (1 << 1)
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#define PIRQ_MSI_GROUP (1 << 2)
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struct evtchn_loop_ctrl;
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struct evtchn_ops {
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unsigned (*max_channels)(void);
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unsigned (*nr_channels)(void);
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int (*setup)(struct irq_info *info);
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void (*remove)(evtchn_port_t port, unsigned int cpu);
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void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
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void (*clear_pending)(unsigned port);
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void (*set_pending)(unsigned port);
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bool (*is_pending)(unsigned port);
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void (*mask)(unsigned port);
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void (*unmask)(unsigned port);
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void (*handle_events)(unsigned cpu, struct evtchn_loop_ctrl *ctrl);
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void (*resume)(void);
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int (*percpu_init)(unsigned int cpu);
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int (*percpu_deinit)(unsigned int cpu);
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};
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extern const struct evtchn_ops *evtchn_ops;
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extern int **evtchn_to_irq;
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int get_evtchn_to_irq(unsigned int evtchn);
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void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl);
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struct irq_info *info_for_irq(unsigned irq);
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unsigned cpu_from_irq(unsigned irq);
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unsigned cpu_from_evtchn(unsigned int evtchn);
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static inline unsigned xen_evtchn_max_channels(void)
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{
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return evtchn_ops->max_channels();
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}
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/*
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* Do any ABI specific setup for a bound event channel before it can
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* be unmasked and used.
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*/
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static inline int xen_evtchn_port_setup(struct irq_info *info)
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{
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if (evtchn_ops->setup)
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return evtchn_ops->setup(info);
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return 0;
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}
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static inline void xen_evtchn_port_remove(evtchn_port_t evtchn,
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unsigned int cpu)
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{
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if (evtchn_ops->remove)
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evtchn_ops->remove(evtchn, cpu);
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}
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static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
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unsigned cpu)
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{
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evtchn_ops->bind_to_cpu(info, cpu);
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}
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static inline void clear_evtchn(unsigned port)
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{
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evtchn_ops->clear_pending(port);
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}
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static inline void set_evtchn(unsigned port)
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{
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evtchn_ops->set_pending(port);
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}
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static inline bool test_evtchn(unsigned port)
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{
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return evtchn_ops->is_pending(port);
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}
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static inline void mask_evtchn(unsigned port)
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{
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return evtchn_ops->mask(port);
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}
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static inline void unmask_evtchn(unsigned port)
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{
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return evtchn_ops->unmask(port);
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}
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static inline void xen_evtchn_handle_events(unsigned cpu,
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struct evtchn_loop_ctrl *ctrl)
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{
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return evtchn_ops->handle_events(cpu, ctrl);
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}
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static inline void xen_evtchn_resume(void)
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{
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if (evtchn_ops->resume)
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evtchn_ops->resume();
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}
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void xen_evtchn_2l_init(void);
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int xen_evtchn_fifo_init(void);
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#endif /* #ifndef __EVENTS_INTERNAL_H__ */
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