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author | Jeremy Fitzhardinge <jeremy@xensource.com> | 2007-07-17 18:37:05 -0700 |
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committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-07-18 08:47:42 -0700 |
commit | e46cdb66c8fc1c8d61cfae0f219ff47ac4b9d531 (patch) | |
tree | 7d9cdfef91e69fcfcba762a5a70cd58900308a5b /include/xen | |
parent | xen: virtual mmu (diff) | |
download | linux-dev-e46cdb66c8fc1c8d61cfae0f219ff47ac4b9d531.tar.xz linux-dev-e46cdb66c8fc1c8d61cfae0f219ff47ac4b9d531.zip |
xen: event channels
Xen implements interrupts in terms of event channels. Each guest
domain gets 1024 event channels which can be used for a variety of
purposes, such as Xen timer events, inter-domain events,
inter-processor events (IPI) or for real hardware IRQs.
Within the kernel, we map the event channels to IRQs, and implement
the whole interrupt handling using a Xen irq_chip.
Rather than setting NR_IRQ to 1024 under PARAVIRT in order to
accomodate Xen, we create a dynamic mapping between event channels and
IRQs. Ideally, Linux will eventually move towards dynamically
allocating per-irq structures, and we can use a 1:1 mapping between
event channels and irqs.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to '')
-rw-r--r-- | include/xen/events.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h new file mode 100644 index 000000000000..77f71c906823 --- /dev/null +++ b/include/xen/events.h @@ -0,0 +1,28 @@ +#ifndef _XEN_EVENTS_H +#define _XEN_EVENTS_H + +#include <linux/irq.h> + +int bind_evtchn_to_irqhandler(unsigned int evtchn, + irqreturn_t (*handler)(int, void *), + unsigned long irqflags, const char *devname, + void *dev_id); +int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu, + irqreturn_t (*handler)(int, void *), + unsigned long irqflags, const char *devname, void *dev_id); + +/* + * Common unbind function for all event sources. Takes IRQ to unbind from. + * Automatically closes the underlying event channel (even for bindings + * made with bind_evtchn_to_irqhandler()). + */ +void unbind_from_irqhandler(unsigned int irq, void *dev_id); + +static inline void notify_remote_via_evtchn(int port) +{ + struct evtchn_send send = { .port = port }; + (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send); +} + +extern void notify_remote_via_irq(int irq); +#endif /* _XEN_EVENTS_H */ |