[Xen-changelog] Mirror changes to x86 un/mask_evtchn

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User djm@xxxxxxxxxxxxxxx
# Node ID 5eb7ca1878bdf872d9d2d5c18fd42d7d3f9bedc3
# Parent  25d0ba51338eb8dd6446cc2083ee34d89a6f6fcf
Mirror changes to x86 un/mask_evtchn

diff -r 25d0ba51338e -r 5eb7ca1878bd 
linux-2.6-xen-sparse/arch/ia64/xen/drivers/evtchn_ia64.c
--- a/linux-2.6-xen-sparse/arch/ia64/xen/drivers/evtchn_ia64.c  Wed Dec 14 
12:52:02 2005
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/drivers/evtchn_ia64.c  Wed Dec 14 
19:02:37 2005
@@ -44,6 +44,47 @@
  * arrays. The lock does not need to be acquired to read the mapping tables.
  */
 static spinlock_t irq_mapping_update_lock;
+
+void mask_evtchn(int port)
+{
+       shared_info_t *s = HYPERVISOR_shared_info;
+       synch_set_bit(port, &s->evtchn_mask[0]);
+}
+EXPORT_SYMBOL(mask_evtchn);
+
+void unmask_evtchn(int port)
+{
+       shared_info_t *s = HYPERVISOR_shared_info;
+       unsigned int cpu = smp_processor_id();
+       vcpu_info_t *vcpu_info = &s->vcpu_info[cpu];
+
+#if 0  // FIXME: diverged from x86 evtchn.c
+       /* Slow path (hypercall) if this is a non-local port. */
+       if (unlikely(cpu != cpu_from_evtchn(port))) {
+               evtchn_op_t op = { .cmd = EVTCHNOP_unmask,
+                                  .u.unmask.port = port };
+               (void)HYPERVISOR_event_channel_op(&op);
+               return;
+       }
+#endif
+
+       synch_clear_bit(port, &s->evtchn_mask[0]);
+
+       /*
+        * The following is basically the equivalent of 'hw_resend_irq'. Just
+        * like a real IO-APIC we 'lose the interrupt edge' if the channel is
+        * masked.
+        */
+       if (synch_test_bit(port, &s->evtchn_pending[0]) && 
+           !synch_test_and_set_bit(port / BITS_PER_LONG,
+                                   &vcpu_info->evtchn_pending_sel)) {
+               vcpu_info->evtchn_upcall_pending = 1;
+               if (!vcpu_info->evtchn_upcall_mask)
+                       force_evtchn_callback();
+       }
+}
+EXPORT_SYMBOL(unmask_evtchn);
+
 
 #define unbound_irq(e) (VALID_EVTCHN(e) && (!evtchns[(e)].opened))
 int bind_virq_to_irqhandler(

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