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Port recent IPI enhachements to en:

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* Introduce the ipi_nmi_handler() function for the Xen infrastructure
* Fixup adeguately the ipi sender functions

Approved by:	re (kib)
This commit is contained in:
Attilio Rao 2009-08-15 18:37:06 +00:00
parent bc5980cb6c
commit 68a5590836
1 changed files with 38 additions and 0 deletions
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38
sys/i386/xen/mp_machdep.c
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@ -118,6 +118,7 @@ volatile int smp_tlb_wait;
typedef void call_data_func_t(uintptr_t , uintptr_t);
static u_int logical_cpus;
static volatile cpumask_t ipi_nmi_pending;
/* used to hold the AP's until we are ready to release them */
static struct mtx ap_boot_mtx;
@ -1109,6 +1110,14 @@ ipi_selected(cpumask_t cpus, u_int ipi)
ipi = IPI_BITMAP_VECTOR;
}
/*
* IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
* of help in order to understand what is the source.
* Set the mask of receiving CPUs for this purpose.
*/
if (ipi == IPI_STOP_HARD)
atomic_set_int(&ipi_nmi_pending, cpus);
CTR3(KTR_SMP, "%s: cpus: %x ipi: %x", __func__, cpus, ipi);
while ((cpu = ffs(cpus)) != 0) {
cpu--;
@ -1140,10 +1149,39 @@ ipi_selected(cpumask_t cpus, u_int ipi)
void
ipi_all_but_self(u_int ipi)
{
/*
* IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
* of help in order to understand what is the source.
* Set the mask of receiving CPUs for this purpose.
*/
if (ipi == IPI_STOP_HARD)
atomic_set_int(&ipi_nmi_pending, PCPU_GET(other_cpus));
CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
ipi_selected(PCPU_GET(other_cpus), ipi);
}
int
ipi_nmi_handler()
{
cpumask_t cpumask;
/*
* As long as there is not a simple way to know about a NMI's
* source, if the bitmask for the current CPU is present in
* the global pending bitword an IPI_STOP_HARD has been issued
* and should be handled.
*/
cpumask = PCPU_GET(cpumask);
if ((ipi_nmi_pending & cpumask) == 0)
return (1);
atomic_clear_int(&ipi_nmi_pending, cpumask);
cpustop_handler();
return (0);
}
/*
* Handle an IPI_STOP by saving our current context and spinning until we
* are resumed.