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Merge part of r221322 from largeSMP project:

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Sync XEN support with i386 about the usage of ipi_send_cpu()

Tested by:	pluknet
MFC after:	2 weeks
This commit is contained in:
Attilio Rao 2011-05-18 16:07:30 +00:00
parent a5db8fd19e
commit 3a0318e055
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222065
1 changed files with 27 additions and 43 deletions
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70
sys/i386/xen/mp_machdep.c
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@ -959,6 +959,30 @@ start_ap(int apic_id)
return 0; /* return FAILURE */
}
/*
* send an IPI to a specific CPU.
*/
static void
ipi_send_cpu(int cpu, u_int ipi)
{
u_int bitmap, old_pending, new_pending;
if (IPI_IS_BITMAPED(ipi)) {
bitmap = 1 << ipi;
ipi = IPI_BITMAP_VECTOR;
do {
old_pending = cpu_ipi_pending[cpu];
new_pending = old_pending | bitmap;
} while (!atomic_cmpset_int(&cpu_ipi_pending[cpu],
old_pending, new_pending));
if (!old_pending)
ipi_pcpu(cpu, RESCHEDULE_VECTOR);
} else {
KASSERT(call_data != NULL, ("call_data not set"));
ipi_pcpu(cpu, CALL_FUNCTION_VECTOR);
}
}
/*
* Flush the TLB on all other CPU's
*/
@ -1101,14 +1125,6 @@ void
ipi_selected(cpumask_t cpus, u_int ipi)
{
int cpu;
u_int bitmap = 0;
u_int old_pending;
u_int new_pending;
if (IPI_IS_BITMAPED(ipi)) {
bitmap = 1 << ipi;
ipi = IPI_BITMAP_VECTOR;
}
/*
* IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
@ -1118,23 +1134,11 @@ ipi_selected(cpumask_t cpus, u_int ipi)
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--;
cpus &= ~(1 << cpu);
if (bitmap) {
do {
old_pending = cpu_ipi_pending[cpu];
new_pending = old_pending | bitmap;
} while (!atomic_cmpset_int(&cpu_ipi_pending[cpu],
old_pending, new_pending));
if (!old_pending)
ipi_pcpu(cpu, RESCHEDULE_VECTOR);
} else {
KASSERT(call_data != NULL, ("call_data not set"));
ipi_pcpu(cpu, CALL_FUNCTION_VECTOR);
}
CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
ipi_send_cpu(cpu, ipi);
}
}
@ -1144,14 +1148,6 @@ ipi_selected(cpumask_t cpus, u_int ipi)
void
ipi_cpu(int cpu, u_int ipi)
{
u_int bitmap = 0;
u_int old_pending;
u_int new_pending;
if (IPI_IS_BITMAPED(ipi)) {
bitmap = 1 << ipi;
ipi = IPI_BITMAP_VECTOR;
}
/*
* IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
@ -1162,19 +1158,7 @@ ipi_cpu(int cpu, u_int ipi)
atomic_set_int(&ipi_nmi_pending, 1 << cpu);
CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
if (bitmap) {
do {
old_pending = cpu_ipi_pending[cpu];
new_pending = old_pending | bitmap;
} while (!atomic_cmpset_int(&cpu_ipi_pending[cpu],
old_pending, new_pending));
if (!old_pending)
ipi_pcpu(cpu, RESCHEDULE_VECTOR);
} else {
KASSERT(call_data != NULL, ("call_data not set"));
ipi_pcpu(cpu, CALL_FUNCTION_VECTOR);
}
ipi_send_cpu(cpu, ipi);
}
/*