Mailing List Archive

[PATCH] [PATCH] update evtchn for SMP
ChangeSet 1.1410, 2005/05/02 09:33:31+01:00, kmacy@netapp.com

[PATCH] [PATCH] update evtchn for SMP

# This is a BitKeeper generated diff -Nru style patch.
#
# ChangeSet
# 2005/05/01 17:01:17-07:00 kmacy@curly.lab.netapp.com
# add SMP support to evtchn
# Signed-off-by: Kip Macy <kmacy@netapp.com>
#
# freebsd-5.3-xen-sparse/i386-xen/include/xen_intr.h
# 2005/05/01 17:01:15-07:00 kmacy@curly.lab.netapp.com +3 -0
# add SMP interfaces
#
# freebsd-5.3-xen-sparse/i386-xen/i386-xen/evtchn.c
# 2005/05/01 17:01:15-07:00 kmacy@curly.lab.netapp.com +85 -9
# add SMP support
#



i386-xen/evtchn.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++------
include/xen_intr.h | 3 +
2 files changed, 88 insertions(+), 9 deletions(-)


diff -Nru a/freebsd-5.3-xen-sparse/i386-xen/i386-xen/evtchn.c b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/evtchn.c
--- a/freebsd-5.3-xen-sparse/i386-xen/i386-xen/evtchn.c 2005-05-02 05:04:49 -04:00
+++ b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/evtchn.c 2005-05-02 05:04:49 -04:00
@@ -31,8 +31,9 @@
static int evtchn_to_irq[NR_EVENT_CHANNELS];
static int irq_to_evtchn[NR_IRQS];

-/* IRQ <-> VIRQ mapping. */
-static int virq_to_irq[NR_VIRQS];
+static int virq_to_irq[MAX_VIRT_CPUS][NR_VIRQS];
+static int ipi_to_evtchn[MAX_VIRT_CPUS][NR_VIRQS];
+

/* Reference counts for bindings to IRQs. */
static int irq_bindcount[NR_IRQS];
@@ -120,7 +121,7 @@

mtx_lock(&irq_mapping_update_lock);

- if ( (irq = virq_to_irq[virq]) == -1 )
+ if ( (irq = PCPU_GET(virq_to_irq)[virq]) == -1 )
{
op.cmd = EVTCHNOP_bind_virq;
op.u.bind_virq.virq = virq;
@@ -132,7 +133,7 @@
evtchn_to_irq[evtchn] = irq;
irq_to_evtchn[irq] = evtchn;

- virq_to_irq[virq] = irq;
+ PCPU_GET(virq_to_irq)[virq] = irq;
}

irq_bindcount[irq]++;
@@ -146,7 +147,7 @@
unbind_virq_from_irq(int virq)
{
evtchn_op_t op;
- int irq = virq_to_irq[virq];
+ int irq = PCPU_GET(virq_to_irq)[virq];
int evtchn = irq_to_evtchn[irq];

mtx_lock(&irq_mapping_update_lock);
@@ -161,7 +162,64 @@

evtchn_to_irq[evtchn] = -1;
irq_to_evtchn[irq] = -1;
- virq_to_irq[virq] = -1;
+ PCPU_GET(virq_to_irq)[virq] = -1;
+ }
+
+ mtx_unlock(&irq_mapping_update_lock);
+}
+
+
+int
+bind_ipi_on_cpu_to_irq(int cpu, int ipi)
+{
+ evtchn_op_t op;
+ int evtchn, irq;
+
+ mtx_lock(&irq_mapping_update_lock);
+
+ if ( (evtchn = PCPU_GET(ipi_to_evtchn)[ipi]) == 0 )
+ {
+ op.cmd = EVTCHNOP_bind_ipi;
+ op.u.bind_ipi.ipi_edom = cpu;
+ if ( HYPERVISOR_event_channel_op(&op) != 0 )
+ panic("Failed to bind virtual IPI %d on cpu %d\n", ipi, cpu);
+ evtchn = op.u.bind_ipi.port;
+
+ irq = find_unbound_irq();
+ evtchn_to_irq[evtchn] = irq;
+ irq_to_evtchn[irq] = evtchn;
+
+ PCPU_GET(ipi_to_evtchn)[ipi] = evtchn;
+ } else
+ irq = evtchn_to_irq[evtchn];
+
+ irq_bindcount[irq]++;
+
+ mtx_unlock(&irq_mapping_update_lock);
+
+ return irq;
+}
+
+void
+unbind_ipi_on_cpu_from_irq(int cpu, int ipi)
+{
+ evtchn_op_t op;
+ int evtchn = PCPU_GET(ipi_to_evtchn)[ipi];
+ int irq = irq_to_evtchn[evtchn];
+
+ mtx_lock(&irq_mapping_update_lock);
+
+ if ( --irq_bindcount[irq] == 0 )
+ {
+ op.cmd = EVTCHNOP_close;
+ op.u.close.dom = DOMID_SELF;
+ op.u.close.port = evtchn;
+ if ( HYPERVISOR_event_channel_op(&op) != 0 )
+ panic("Failed to unbind virtual IPI %d on cpu %d\n", ipi, cpu);
+
+ evtchn_to_irq[evtchn] = -1;
+ irq_to_evtchn[irq] = -1;
+ PCPU_GET(ipi_to_evtchn)[ipi] = 0;
}

mtx_unlock(&irq_mapping_update_lock);
@@ -464,7 +522,7 @@
/* Unbind VIRQs from event channels. */
for ( virq = 0; virq < NR_VIRQS; virq++ )
{
- if ( (irq = virq_to_irq[virq]) == -1 )
+ if ( (irq = PCPU_GET(virq_to_irq)[virq]) == -1 )
continue;
evtchn = irq_to_evtchn[irq];

@@ -493,7 +551,7 @@

for ( virq = 0; virq < NR_VIRQS; virq++ )
{
- if ( (irq = virq_to_irq[virq]) == -1 )
+ if ( (irq = PCPU_GET(virq_to_irq)[virq]) == -1 )
continue;

/* Get a new binding from Xen. */
@@ -512,6 +570,20 @@
}
}

+void
+ap_evtchn_init(int cpu)
+{
+ int i;
+
+ /* XXX -- expedience hack */
+ PCPU_SET(virq_to_irq, (int *)&virq_to_irq[cpu]);
+ PCPU_SET(ipi_to_evtchn, (int *)&ipi_to_evtchn[cpu]);
+
+ /* No VIRQ -> IRQ mappings. */
+ for ( i = 0; i < NR_VIRQS; i++ )
+ PCPU_GET(virq_to_irq)[i] = -1;
+}
+
static void
evtchn_init(void *dummy __unused)
{
@@ -527,9 +599,13 @@
*/
mtx_init(&irq_mapping_update_lock, "xp", NULL, MTX_DEF);

+ /* XXX -- expedience hack */
+ PCPU_SET(virq_to_irq, (int *)&virq_to_irq[0]);
+ PCPU_SET(ipi_to_evtchn, (int *)&ipi_to_evtchn[0]);
+
/* No VIRQ -> IRQ mappings. */
for ( i = 0; i < NR_VIRQS; i++ )
- virq_to_irq[i] = -1;
+ PCPU_GET(virq_to_irq)[i] = -1;

/* No event-channel -> IRQ mappings. */
for ( i = 0; i < NR_EVENT_CHANNELS; i++ )
diff -Nru a/freebsd-5.3-xen-sparse/i386-xen/include/xen_intr.h b/freebsd-5.3-xen-sparse/i386-xen/include/xen_intr.h
--- a/freebsd-5.3-xen-sparse/i386-xen/include/xen_intr.h 2005-05-02 05:04:49 -04:00
+++ b/freebsd-5.3-xen-sparse/i386-xen/include/xen_intr.h 2005-05-02 05:04:49 -04:00
@@ -31,6 +31,9 @@
extern void unbind_virq_from_irq(int virq);
extern int bind_evtchn_to_irq(int evtchn);
extern void unbind_evtchn_from_irq(int evtchn);
+extern int bind_ipi_on_cpu_to_irq(int cpu, int ipi);
+extern void unbind_ipi_on_cpu_from_irq(int cpu, int ipi);
+extern void ap_evtchn_init(int cpu);

static __inline__ int irq_cannonicalize(int irq)
{

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