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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] VIRQs and IPIs on VCPU#0 are automatically re-bound on save/restore.
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 805ee053e61f4c25e642ff3bb9e657966a15bc33
# Parent c317e0aca9f12b086bdfe1f442a7c2221605a2bd
VIRQs and IPIs on VCPU#0 are automatically re-bound on save/restore.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/arch/xen/i386/kernel/smp.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/smp.c Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/smp.c Thu Sep 29 12:05:43 2005
@@ -131,21 +131,9 @@
static inline void __send_IPI_one(unsigned int cpu, int vector)
{
- unsigned int evtchn;
-
- evtchn = per_cpu(ipi_to_evtchn, cpu)[vector];
- // printk("send_IPI_mask_bitmask cpu %d vector %d evtchn %d\n", cpu,
vector, evtchn);
- if (evtchn) {
-#if 0
- shared_info_t *s = HYPERVISOR_shared_info;
- while (synch_test_bit(evtchn, &s->evtchn_pending[0]) ||
- synch_test_bit(evtchn, &s->evtchn_mask[0]))
- ;
-#endif
- notify_via_evtchn(evtchn);
- } else
- printk("send_IPI to unbound port %d/%d",
- cpu, vector);
+ int evtchn = per_cpu(ipi_to_evtchn, cpu)[vector];
+ BUG_ON(evtchn < 0);
+ notify_via_evtchn(evtchn);
}
void __send_IPI_shortcut(unsigned int shortcut, int vector)
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c Thu Sep 29 12:05:43 2005
@@ -836,13 +836,6 @@
cpu_clear(smp_processor_id(), nohz_cpu_mask);
}
-void time_suspend(void)
-{
- /* nothing */
- teardown_irq(per_cpu(timer_irq, 0), &irq_timer);
- unbind_virq_from_irq(VIRQ_TIMER);
-}
-
/* No locking required. We are only CPU running, and interrupts are off. */
void time_resume(void)
{
@@ -854,9 +847,6 @@
per_cpu(processed_system_time, 0) = processed_system_time;
update_wallclock();
-
- per_cpu(timer_irq, 0) = bind_virq_to_irq(VIRQ_TIMER);
- (void)setup_irq(per_cpu(timer_irq, 0), &irq_timer);
}
#ifdef CONFIG_SMP
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/arch/xen/kernel/evtchn.c
--- a/linux-2.6-xen-sparse/arch/xen/kernel/evtchn.c Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/arch/xen/kernel/evtchn.c Thu Sep 29 12:05:43 2005
@@ -78,22 +78,28 @@
cpu_evtchn_mask[cpu][idx] & \
~(sh)->evtchn_mask[idx])
-void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
+static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
{
clear_bit(chn, (unsigned long *)cpu_evtchn_mask[cpu_evtchn[chn]]);
set_bit(chn, (unsigned long *)cpu_evtchn_mask[cpu]);
cpu_evtchn[chn] = cpu;
}
+static void init_evtchn_cpu_bindings(void)
+{
+ /* By default all event channels notify CPU#0. */
+ memset(cpu_evtchn, 0, sizeof(cpu_evtchn));
+ memset(cpu_evtchn_mask[0], ~0, sizeof(cpu_evtchn_mask[0]));
+}
+
#else
#define active_evtchns(cpu,sh,idx) \
((sh)->evtchn_pending[idx] & \
~(sh)->evtchn_mask[idx])
-
-void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
-{
-}
+#define bind_evtchn_to_cpu(chn,cpu) ((void)0)
+#define init_evtchn_cpu_bindings() ((void)0)
+
#endif
/* Upcall to generic IRQ layer. */
@@ -244,7 +250,7 @@
spin_lock(&irq_mapping_update_lock);
- if ((evtchn = per_cpu(ipi_to_evtchn, cpu)[ipi]) == 0) {
+ if ((evtchn = per_cpu(ipi_to_evtchn, cpu)[ipi]) == -1) {
op.cmd = EVTCHNOP_bind_ipi;
BUG_ON(HYPERVISOR_event_channel_op(&op) != 0);
evtchn = op.u.bind_ipi.port;
@@ -287,7 +293,7 @@
bind_evtchn_to_cpu(evtchn, 0);
evtchn_to_irq[evtchn] = -1;
irq_to_evtchn[irq] = -1;
- per_cpu(ipi_to_evtchn, cpu)[ipi] = 0;
+ per_cpu(ipi_to_evtchn, cpu)[ipi] = -1;
}
spin_unlock(&irq_mapping_update_lock);
@@ -608,41 +614,32 @@
synch_set_bit(evtchn, &s->evtchn_pending[0]);
}
-void irq_suspend(void)
-{
- int pirq, virq, irq, evtchn;
- int cpu = smp_processor_id(); /* XXX */
-
- /* Unbind VIRQs from event channels. */
- for (virq = 0; virq < NR_VIRQS; virq++) {
- if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
- continue;
- evtchn = irq_to_evtchn[irq];
-
- /* Mark the event channel as unused in our table. */
- evtchn_to_irq[evtchn] = -1;
- irq_to_evtchn[irq] = -1;
- }
-
- /* Check that no PIRQs are still bound. */
- for (pirq = 0; pirq < NR_PIRQS; pirq++)
- if ((evtchn = irq_to_evtchn[pirq_to_irq(pirq)]) != -1)
- panic("Suspend attempted while PIRQ %d bound "
- "to evtchn %d.\n", pirq, evtchn);
-}
-
void irq_resume(void)
{
evtchn_op_t op;
- int virq, irq, evtchn;
- int cpu = smp_processor_id(); /* XXX */
+ int cpu, pirq, virq, ipi, irq, evtchn;
+
+ init_evtchn_cpu_bindings();
/* New event-channel space is not 'live' yet. */
for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
mask_evtchn(evtchn);
+ /* Check that no PIRQs are still bound. */
+ for (pirq = 0; pirq < NR_PIRQS; pirq++)
+ BUG_ON(irq_to_evtchn[pirq_to_irq(pirq)] != -1);
+
+ /* Secondary CPUs must have no VIRQ or IPI bindings. */
+ for (cpu = 1; cpu < NR_CPUS; cpu++) {
+ for (virq = 0; virq < NR_VIRQS; virq++)
+ BUG_ON(per_cpu(virq_to_irq, cpu)[virq] != -1);
+ for (ipi = 0; ipi < NR_IPIS; ipi++)
+ BUG_ON(per_cpu(ipi_to_evtchn, cpu)[ipi] != -1);
+ }
+
+ /* Primary CPU: rebind VIRQs automatically. */
for (virq = 0; virq < NR_VIRQS; virq++) {
- if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
+ if ((irq = per_cpu(virq_to_irq, 0)[virq]) == -1)
continue;
/* Get a new binding from Xen. */
@@ -652,13 +649,33 @@
evtchn = op.u.bind_virq.port;
/* Record the new mapping. */
- bind_evtchn_to_cpu(evtchn, 0);
evtchn_to_irq[evtchn] = irq;
irq_to_evtchn[irq] = evtchn;
/* Ready for use. */
unmask_evtchn(evtchn);
}
+
+ /* Primary CPU: rebind IPIs automatically. */
+ for (ipi = 0; ipi < NR_IPIS; ipi++) {
+ if ((evtchn = per_cpu(ipi_to_evtchn, 0)[ipi]) == -1)
+ continue;
+
+ irq = evtchn_to_irq[evtchn];
+ evtchn_to_irq[evtchn] = -1;
+
+ /* Get a new binding from Xen. */
+ op.cmd = EVTCHNOP_bind_ipi;
+ BUG_ON(HYPERVISOR_event_channel_op(&op) != 0);
+ evtchn = op.u.bind_ipi.port;
+
+ /* Record the new mapping. */
+ evtchn_to_irq[evtchn] = irq;
+ irq_to_evtchn[irq] = evtchn;
+
+ /* Ready for use. */
+ unmask_evtchn(evtchn);
+ }
}
void __init init_IRQ(void)
@@ -670,15 +687,15 @@
spin_lock_init(&irq_mapping_update_lock);
-#ifdef CONFIG_SMP
- /* By default all event channels notify CPU#0. */
- memset(cpu_evtchn_mask[0], ~0, sizeof(cpu_evtchn_mask[0]));
-#endif
+ init_evtchn_cpu_bindings();
for (cpu = 0; cpu < NR_CPUS; cpu++) {
/* No VIRQ -> IRQ mappings. */
for (i = 0; i < NR_VIRQS; i++)
per_cpu(virq_to_irq, cpu)[i] = -1;
+ /* No VIRQ -> IRQ mappings. */
+ for (i = 0; i < NR_IPIS; i++)
+ per_cpu(ipi_to_evtchn, cpu)[i] = -1;
}
/* No event-channel -> IRQ mappings. */
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/arch/xen/kernel/reboot.c
--- a/linux-2.6-xen-sparse/arch/xen/kernel/reboot.c Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/arch/xen/kernel/reboot.c Thu Sep 29 12:05:43 2005
@@ -74,16 +74,12 @@
extern int gnttab_suspend(void);
extern int gnttab_resume(void);
- extern void time_suspend(void);
extern void time_resume(void);
extern unsigned long max_pfn;
extern unsigned long *pfn_to_mfn_frame_list_list;
extern unsigned long *pfn_to_mfn_frame_list[];
#ifdef CONFIG_SMP
- extern void smp_suspend(void);
- extern void smp_resume(void);
-
static vcpu_guest_context_t suspended_cpu_records[NR_CPUS];
cpumask_t prev_online_cpus, prev_present_cpus;
@@ -156,17 +152,9 @@
kmem_cache_shrink(pgd_cache);
#endif
- time_suspend();
-
-#ifdef CONFIG_SMP
- smp_suspend();
-#endif
-
xenbus_suspend();
xencons_suspend();
-
- irq_suspend();
gnttab_suspend();
@@ -212,10 +200,6 @@
xenbus_resume();
-#ifdef CONFIG_SMP
- smp_resume();
-#endif
-
time_resume();
usbif_resume();
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/arch/xen/x86_64/kernel/genapic_xen.c
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/genapic_xen.c Thu Sep 29
10:10:27 2005
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/genapic_xen.c Thu Sep 29
12:05:43 2005
@@ -31,14 +31,9 @@
static inline void __send_IPI_one(unsigned int cpu, int vector)
{
- unsigned int evtchn;
- Dprintk("%s\n", __FUNCTION__);
-
- evtchn = per_cpu(ipi_to_evtchn, cpu)[vector];
- if (evtchn)
- notify_via_evtchn(evtchn);
- else
- printk("send_IPI to unbound port %d/%d", cpu, vector);
+ int evtchn = per_cpu(ipi_to_evtchn, cpu)[vector];
+ BUG_ON(evtchn < 0);
+ notify_via_evtchn(evtchn);
}
void xen_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int
dest)
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/include/asm-xen/asm-i386/mach-xen/irq_vectors.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-i386/mach-xen/irq_vectors.h
Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-i386/mach-xen/irq_vectors.h
Thu Sep 29 12:05:43 2005
@@ -80,11 +80,9 @@
* the usable vector space is 0x20-0xff (224 vectors)
*/
-#define NR_IPIS 8
-
-#define RESCHEDULE_VECTOR 1
-#define INVALIDATE_TLB_VECTOR 2
-#define CALL_FUNCTION_VECTOR 3
+#define RESCHEDULE_VECTOR 0
+#define CALL_FUNCTION_VECTOR 1
+#define NR_IPIS 2
/*
* The maximum number of vectors supported by i386 processors
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h
Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mach-xen/irq_vectors.h
Thu Sep 29 12:05:43 2005
@@ -78,11 +78,9 @@
* the usable vector space is 0x20-0xff (224 vectors)
*/
-#define NR_IPIS 8
-
-#define RESCHEDULE_VECTOR 1
-#define INVALIDATE_TLB_VECTOR 2
-#define CALL_FUNCTION_VECTOR 3
+#define RESCHEDULE_VECTOR 0
+#define CALL_FUNCTION_VECTOR 1
+#define NR_IPIS 2
/*
* The maximum number of vectors supported by i386 processors
diff -r c317e0aca9f1 -r 805ee053e61f
linux-2.6-xen-sparse/include/asm-xen/evtchn.h
--- a/linux-2.6-xen-sparse/include/asm-xen/evtchn.h Thu Sep 29 10:10:27 2005
+++ b/linux-2.6-xen-sparse/include/asm-xen/evtchn.h Thu Sep 29 12:05:43 2005
@@ -68,7 +68,6 @@
void *dev_id);
extern void unbind_evtchn_from_irqhandler(unsigned int evtchn, void *dev_id);
-extern void irq_suspend(void);
extern void irq_resume(void);
/* Entry point for notifications into Linux subsystems. */
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