drivers/xen/events/events_internal.h

   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;
  38         unsigned int evtchn;    /* event channel */
  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 #define PIRQ_MSI_GROUP  (1 << 2)
  57
  58 struct evtchn_ops {
  59         unsigned (*max_channels)(void);
  60         unsigned (*nr_channels)(void);
  61
  62         int (*setup)(struct irq_info *info);
  63         void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
  64
  65         void (*clear_pending)(unsigned port);
  66         void (*set_pending)(unsigned port);
  67         bool (*is_pending)(unsigned port);
  68         bool (*test_and_set_mask)(unsigned port);
  69         void (*mask)(unsigned port);
  70         void (*unmask)(unsigned port);
  71         void (*close)(unsigned port, unsigned cpu);
  72
  73         void (*handle_events)(unsigned cpu);
  74         void (*resume)(void);
  75 };
  76
  77 extern const struct evtchn_ops *evtchn_ops;
  78
  79 extern int **evtchn_to_irq;
  80 int get_evtchn_to_irq(unsigned int evtchn);
  81
  82 struct irq_info *info_for_irq(unsigned irq);
  83 unsigned cpu_from_irq(unsigned irq);
  84 unsigned cpu_from_evtchn(unsigned int evtchn);
  85
  86 static inline unsigned xen_evtchn_max_channels(void)
  87 {
  88         return evtchn_ops->max_channels();
  89 }
  90
  91 /*
  92  * Do any ABI specific setup for a bound event channel before it can
  93  * be unmasked and used.
  94  */
  95 static inline int xen_evtchn_port_setup(struct irq_info *info)
  96 {
  97         if (evtchn_ops->setup)
  98                 return evtchn_ops->setup(info);
  99         return 0;
 100 }
 101
 102 static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
 103                                                unsigned cpu)
 104 {
 105         evtchn_ops->bind_to_cpu(info, cpu);
 106 }
 107
 108 static inline void clear_evtchn(unsigned port)
 109 {
 110         evtchn_ops->clear_pending(port);
 111 }
 112
 113 static inline void set_evtchn(unsigned port)
 114 {
 115         evtchn_ops->set_pending(port);
 116 }
 117
 118 static inline bool test_evtchn(unsigned port)
 119 {
 120         return evtchn_ops->is_pending(port);
 121 }
 122
 123 static inline bool test_and_set_mask(unsigned port)
 124 {
 125         return evtchn_ops->test_and_set_mask(port);
 126 }
 127
 128 static inline void mask_evtchn(unsigned port)
 129 {
 130         return evtchn_ops->mask(port);
 131 }
 132
 133 static inline void unmask_evtchn(unsigned port)
 134 {
 135         return evtchn_ops->unmask(port);
 136 }
 137
 138 static inline void xen_evtchn_handle_events(unsigned cpu)
 139 {
 140         return evtchn_ops->handle_events(cpu);
 141 }
 142
 143 static inline void xen_evtchn_resume(void)
 144 {
 145         if (evtchn_ops->resume)
 146                 evtchn_ops->resume();
 147 }
 148
 149 static inline void xen_evtchn_op_close(unsigned port, unsigned cpu)
 150 {
 151         if (evtchn_ops->close)
 152                 return evtchn_ops->close(port, cpu);
 153 }
 154
 155 void xen_evtchn_2l_init(void);
 156 int xen_evtchn_fifo_init(void);
 157
 158 #endif /* #ifndef __EVENTS_INTERNAL_H__ */