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/******************************************************************************
* event.h
*
* A nice interface for passing asynchronous events to guest OSes.
*
* Copyright (c) 2002, K A Fraser
*/
#include <xeno/config.h>
#include <xeno/sched.h>
#include <asm/bitops.h>
#ifdef CONFIG_SMP
/*
* mark_guest_event:
* @p: Domain to which event should be passed
* @event: Event number
* RETURNS: "Bitmask" of CPU on which process is currently running
*
* Idea is that caller may loop on task_list, looking for domains
* to pass events to (using this function). The caller accumulates the
* bits returned by this function (ORing them together) then calls
* event_notify().
*
* Guest_events are per-domain events passed directly to the guest OS
* in ring 1.
*/
static inline unsigned long mark_guest_event(struct task_struct *p, int event)
{
set_bit(event, &p->shared_info->events);
/*
* No need for the runqueue_lock! The check below does not race
* with the setting of has_cpu, because that is set with runqueue_lock
* held. The lock must be released before hypervisor exit (and so
* a write barrier executed). And, just before hypervisor exit,
* outstanding events are checked. So bit is certainly set early enough.
*/
smp_mb();
if ( p->state == TASK_INTERRUPTIBLE ) wake_up(p);
reschedule(p);
return p->has_cpu ? (1 << p->processor) : 0;
}
/* As above, but hyp_events are handled within the hypervisor. */
static inline unsigned long mark_hyp_event(struct task_struct *p, int event)
{
set_bit(event, &p->hyp_events);
smp_mb();
if ( p->state == TASK_INTERRUPTIBLE ) wake_up(p);
reschedule(p);
return p->has_cpu ? (1 << p->processor) : 0;
}
/* Notify the given set of CPUs that guest events may be outstanding. */
static inline void guest_event_notify(unsigned long cpu_mask)
{
cpu_mask &= ~(1 << smp_processor_id());
if ( cpu_mask != 0 ) smp_send_event_check_mask(cpu_mask);
}
#else
static inline unsigned long mark_guest_event(struct task_struct *p, int event)
{
set_bit(event, &p->shared_info->events);
if ( p->state == TASK_INTERRUPTIBLE ) wake_up(p);
reschedule(p);
return 0;
}
static inline unsigned long mark_hyp_event(struct task_struct *p, int event)
{
set_bit(event, &p->hyp_events);
if ( p->state == TASK_INTERRUPTIBLE ) wake_up(p);
reschedule(p);
return 0;
}
#define guest_event_notify(_mask) ((void)0)
#endif
/* Notify hypervisor events in thesame way as for guest OS events. */
#define hyp_event_notify(_mask) guest_event_notify(_mask)
/* Clear a guest-OS event from a per-domain mask. */
static inline void clear_guest_event(struct task_struct *p, int event)
{
clear_bit(event, &p->shared_info->events);
}
/* Clear a hypervisor event from a per-domain mask. */
static inline void clear_hyp_event(struct task_struct *p, int event)
{
clear_bit(event, &p->hyp_events);
}
/* Called on return from (architecture-dependent) entry.S. */
void do_hyp_events(void);
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