Author: adrian
Date: Sat May 30 08:53:13 2009
New Revision: 193085
URL: http://svn.freebsd.org/changeset/base/193085
Log:
Make ipi_cpu() function as intended.
IPI's in Xen are implemented through hypervisor event channels.
The MP code creates a pair of IRQs for each base IPI per CPU
(one for IPI function dispatch calls, one for IPI bitmap dispatch calls.)
Using PCPU_GET() was returning the IRQ of the IPI handler for the
current CPU; thus calls to ipi_cpu() were sending itself a message.
Instead, looking up the IPI in the target CPU ipi-to-irq map is needed.
Note: This doesn't fix Xen SMP (far from it!) but it at least
sends IPI's to the right places. Next - sending IPIs..
PR: 135069
Modified:
head/sys/xen/evtchn/evtchn.c
Modified: head/sys/xen/evtchn/evtchn.c
==============================================================================
--- head/sys/xen/evtchn/evtchn.c Sat May 30 07:33:32 2009
(r193084)
+++ head/sys/xen/evtchn/evtchn.c Sat May 30 08:53:13 2009
(r193085)
@@ -225,12 +225,15 @@ evtchn_do_upcall(struct trapframe *frame
}
}
+/*
+ * Send an IPI from the current CPU to the destination CPU.
+ */
void
ipi_pcpu(unsigned int cpu, int vector)
{
int irq;
- irq = PCPU_GET(ipi_to_irq[vector]);
+ irq = pcpu_find(cpu)->pc_ipi_to_irq[vector];
notify_remote_via_irq(irq);
}
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