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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/8] evtchn: refactor low-level event channel port ops
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Use functions for the low-level event channel port operations
(set/clear pending, unmask, is_pending and is_masked).
Group these functions into a struct evtchn_port_op so they can be
replaced by alternate implementations (for different ABIs) on a
per-domain basis.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
xen/arch/x86/irq.c | 11 ++---
xen/common/Makefile | 1 +
xen/common/event_2l.c | 99 ++++++++++++++++++++++++++++++++++++++++++++
xen/common/event_channel.c | 89 ++++++++++++++++-----------------------
xen/common/schedule.c | 3 +-
xen/include/xen/event.h | 43 +++++++++++++++++++
xen/include/xen/sched.h | 4 ++
7 files changed, 190 insertions(+), 60 deletions(-)
create mode 100644 xen/common/event_2l.c
diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index ae66de2..42199a3 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -1474,7 +1474,7 @@ int pirq_guest_unmask(struct domain *d)
{
pirq = pirqs[i]->pirq;
if ( pirqs[i]->masked &&
- !test_bit(pirqs[i]->evtchn, &shared_info(d, evtchn_mask)) )
+ !evtchn_port_is_masked(d, evtchn_from_port(d,
pirqs[i]->evtchn)) )
pirq_guest_eoi(pirqs[i]);
}
} while ( ++pirq < d->nr_pirqs && n == ARRAY_SIZE(pirqs) );
@@ -2088,6 +2088,7 @@ static void dump_irqs(unsigned char key)
int i, irq, pirq;
struct irq_desc *desc;
irq_guest_action_t *action;
+ struct evtchn *evtchn;
struct domain *d;
const struct pirq *info;
unsigned long flags;
@@ -2128,13 +2129,11 @@ static void dump_irqs(unsigned char key)
d = action->guest[i];
pirq = domain_irq_to_pirq(d, irq);
info = pirq_info(d, pirq);
+ evtchn = evtchn_from_port(d, info->evtchn);
printk("%u:%3d(%c%c%c)",
d->domain_id, pirq,
- (test_bit(info->evtchn,
- &shared_info(d, evtchn_pending)) ?
- 'P' : '-'),
- (test_bit(info->evtchn, &shared_info(d, evtchn_mask)) ?
- 'M' : '-'),
+ (evtchn_port_is_pending(d, evtchn) ? 'P' : '-'),
+ (evtchn_port_is_masked(d, evtchn) ? 'M' : '-'),
(info->masked ? 'M' : '-'));
if ( i != action->nr_guests )
printk(",");
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 0dc2050..ef03eac 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -5,6 +5,7 @@ obj-y += cpupool.o
obj-$(HAS_DEVICE_TREE) += device_tree.o
obj-y += domctl.o
obj-y += domain.o
+obj-y += event_2l.o
obj-y += event_channel.o
obj-y += grant_table.o
obj-y += irq.o
diff --git a/xen/common/event_2l.c b/xen/common/event_2l.c
new file mode 100644
index 0000000..18c0c6e
--- /dev/null
+++ b/xen/common/event_2l.c
@@ -0,0 +1,99 @@
+/*
+ * Event channel port operations.
+ *
+ * Copyright (c) 2003-2006, K A Fraser.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2 or later. See the file COPYING for more details.
+ */
+
+#include <xen/config.h>
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/errno.h>
+#include <xen/sched.h>
+#include <xen/event.h>
+
+static void evtchn_2l_set_pending(struct vcpu *v, struct evtchn *evtchn)
+{
+ struct domain *d = v->domain;
+ unsigned port = evtchn->port;
+
+ /*
+ * The following bit operations must happen in strict order.
+ * NB. On x86, the atomic bit operations also act as memory barriers.
+ * There is therefore sufficiently strict ordering for this architecture --
+ * others may require explicit memory barriers.
+ */
+
+ if ( test_and_set_bit(port, &shared_info(d, evtchn_pending)) )
+ return;
+
+ if ( !test_bit (port, &shared_info(d, evtchn_mask)) &&
+ !test_and_set_bit(port / BITS_PER_EVTCHN_WORD(d),
+ &vcpu_info(v, evtchn_pending_sel)) )
+ {
+ vcpu_mark_events_pending(v);
+ }
+
+ evtchn_check_pollers(d, port);
+}
+
+static void evtchn_2l_clear_pending(struct domain *d, struct evtchn *evtchn)
+{
+ clear_bit(evtchn->port, &shared_info(d, evtchn_pending));
+}
+
+static void evtchn_2l_unmask(struct domain *d, struct evtchn *evtchn)
+{
+ struct vcpu *v = d->vcpu[evtchn->notify_vcpu_id];
+ unsigned port = evtchn->port;
+
+ /*
+ * These operations must happen in strict order. Based on
+ * evtchn_2l_set_pending() above.
+ */
+ if ( test_and_clear_bit(port, &shared_info(d, evtchn_mask)) &&
+ test_bit (port, &shared_info(d, evtchn_pending)) &&
+ !test_and_set_bit (port / BITS_PER_EVTCHN_WORD(d),
+ &vcpu_info(v, evtchn_pending_sel)) )
+ {
+ vcpu_mark_events_pending(v);
+ }
+}
+
+static bool_t evtchn_2l_is_pending(struct domain *d,
+ const struct evtchn *evtchn)
+{
+ return test_bit(evtchn->port, &shared_info(d, evtchn_pending));
+}
+
+static bool_t evtchn_2l_is_masked(struct domain *d,
+ const struct evtchn *evtchn)
+{
+ return test_bit(evtchn->port, &shared_info(d, evtchn_mask));
+}
+
+static const struct evtchn_port_ops evtchn_port_ops_2l =
+{
+ .set_pending = evtchn_2l_set_pending,
+ .clear_pending = evtchn_2l_clear_pending,
+ .unmask = evtchn_2l_unmask,
+ .is_pending = evtchn_2l_is_pending,
+ .is_masked = evtchn_2l_is_masked,
+};
+
+void evtchn_2l_init(struct domain *d)
+{
+ d->evtchn_port_ops = &evtchn_port_ops_2l;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 64c976b..01d0b77 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -150,6 +150,7 @@ static int get_free_port(struct domain *d)
xfree(chn);
return -ENOMEM;
}
+ chn[i].port = port + i;
}
bucket_from_port(d, port) = chn;
@@ -530,7 +531,7 @@ static long __evtchn_close(struct domain *d1, int port1)
}
/* Clear pending event to avoid unexpected behavior on re-bind. */
- clear_bit(port1, &shared_info(d1, evtchn_pending));
+ evtchn_port_clear_pending(d1, chn1);
/* Reset binding to vcpu0 when the channel is freed. */
chn1->state = ECS_FREE;
@@ -615,43 +616,10 @@ out:
static void evtchn_set_pending(struct vcpu *v, int port)
{
- struct domain *d = v->domain;
- int vcpuid;
-
- /*
- * The following bit operations must happen in strict order.
- * NB. On x86, the atomic bit operations also act as memory barriers.
- * There is therefore sufficiently strict ordering for this architecture --
- * others may require explicit memory barriers.
- */
-
- if ( test_and_set_bit(port, &shared_info(d, evtchn_pending)) )
- return;
-
- if ( !test_bit (port, &shared_info(d, evtchn_mask)) &&
- !test_and_set_bit(port / BITS_PER_EVTCHN_WORD(d),
- &vcpu_info(v, evtchn_pending_sel)) )
- {
- vcpu_mark_events_pending(v);
- }
-
- /* Check if some VCPU might be polling for this event. */
- if ( likely(bitmap_empty(d->poll_mask, d->max_vcpus)) )
- return;
+ struct evtchn *evtchn;
- /* Wake any interested (or potentially interested) pollers. */
- for ( vcpuid = find_first_bit(d->poll_mask, d->max_vcpus);
- vcpuid < d->max_vcpus;
- vcpuid = find_next_bit(d->poll_mask, d->max_vcpus, vcpuid+1) )
- {
- v = d->vcpu[vcpuid];
- if ( ((v->poll_evtchn <= 0) || (v->poll_evtchn == port)) &&
- test_and_clear_bit(vcpuid, d->poll_mask) )
- {
- v->poll_evtchn = 0;
- vcpu_unblock(v);
- }
- }
+ evtchn = evtchn_from_port(v->domain, port);
+ evtchn_port_set_pending(v, evtchn);
}
int guest_enabled_event(struct vcpu *v, uint32_t virq)
@@ -920,26 +888,15 @@ long evtchn_bind_vcpu(unsigned int port, unsigned int
vcpu_id)
int evtchn_unmask(unsigned int port)
{
struct domain *d = current->domain;
- struct vcpu *v;
+ struct evtchn *evtchn;
ASSERT(spin_is_locked(&d->event_lock));
if ( unlikely(!port_is_valid(d, port)) )
return -EINVAL;
- v = d->vcpu[evtchn_from_port(d, port)->notify_vcpu_id];
-
- /*
- * These operations must happen in strict order. Based on
- * include/xen/event.h:evtchn_set_pending().
- */
- if ( test_and_clear_bit(port, &shared_info(d, evtchn_mask)) &&
- test_bit (port, &shared_info(d, evtchn_pending)) &&
- !test_and_set_bit (port / BITS_PER_EVTCHN_WORD(d),
- &vcpu_info(v, evtchn_pending_sel)) )
- {
- vcpu_mark_events_pending(v);
- }
+ evtchn = evtchn_from_port(d, port);
+ evtchn_port_unmask(d, evtchn);
return 0;
}
@@ -1170,9 +1127,35 @@ void notify_via_xen_event_channel(struct domain *ld, int
lport)
spin_unlock(&ld->event_lock);
}
+void evtchn_check_pollers(struct domain *d, unsigned port)
+{
+ struct vcpu *v;
+ unsigned vcpuid;
+
+ /* Check if some VCPU might be polling for this event. */
+ if ( likely(bitmap_empty(d->poll_mask, d->max_vcpus)) )
+ return;
+
+ /* Wake any interested (or potentially interested) pollers. */
+ for ( vcpuid = find_first_bit(d->poll_mask, d->max_vcpus);
+ vcpuid < d->max_vcpus;
+ vcpuid = find_next_bit(d->poll_mask, d->max_vcpus, vcpuid+1) )
+ {
+ v = d->vcpu[vcpuid];
+ if ( ((v->poll_evtchn <= 0) || (v->poll_evtchn == port)) &&
+ test_and_clear_bit(vcpuid, d->poll_mask) )
+ {
+ v->poll_evtchn = 0;
+ vcpu_unblock(v);
+ }
+ }
+}
int evtchn_init(struct domain *d)
{
+ /* Default to N-level ABI. */
+ evtchn_2l_init(d);
+
spin_lock_init(&d->event_lock);
if ( get_free_port(d) != 0 )
return -EINVAL;
@@ -1270,8 +1253,8 @@ static void domain_dump_evtchn_info(struct domain *d)
printk(" %4u [%d/%d]: s=%d n=%d x=%d",
port,
- !!test_bit(port, &shared_info(d, evtchn_pending)),
- !!test_bit(port, &shared_info(d, evtchn_mask)),
+ !!evtchn_port_is_pending(d, chn),
+ !!evtchn_port_is_masked(d, chn),
chn->state, chn->notify_vcpu_id, chn->xen_consumer);
switch ( chn->state )
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index a8398bd..7e6884d 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -34,6 +34,7 @@
#include <xen/multicall.h>
#include <xen/cpu.h>
#include <xen/preempt.h>
+#include <xen/event.h>
#include <public/sched.h>
#include <xsm/xsm.h>
@@ -751,7 +752,7 @@ static long do_poll(struct sched_poll *sched_poll)
goto out;
rc = 0;
- if ( test_bit(port, &shared_info(d, evtchn_pending)) )
+ if ( evtchn_port_is_pending(d, evtchn_from_port(d, port)) )
goto out;
}
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index 6f60162..208f7bd 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -102,4 +102,47 @@ void notify_via_xen_event_channel(struct domain *ld, int
lport);
smp_mb(); /* set blocked status /then/ caller does his work */ \
} while ( 0 )
+void evtchn_check_pollers(struct domain *d, unsigned port);
+
+void evtchn_2l_init(struct domain *d);
+
+/*
+ * Low-level event channel port ops.
+ */
+struct evtchn_port_ops {
+ void (*set_pending)(struct vcpu *v, struct evtchn *evtchn);
+ void (*clear_pending)(struct domain *d, struct evtchn *evtchn);
+ void (*unmask)(struct domain *d, struct evtchn *evtchn);
+ bool_t (*is_pending)(struct domain *d, const struct evtchn *evtchn);
+ bool_t (*is_masked)(struct domain *d, const struct evtchn *evtchn);
+};
+
+static inline void evtchn_port_set_pending(struct vcpu *v, struct evtchn
*evtchn)
+{
+ v->domain->evtchn_port_ops->set_pending(v, evtchn);
+}
+
+static inline void evtchn_port_clear_pending(struct domain *d, struct evtchn
*evtchn)
+{
+ d->evtchn_port_ops->clear_pending(d, evtchn);
+}
+
+static inline void evtchn_port_unmask(struct domain *d,
+ struct evtchn *evtchn)
+{
+ d->evtchn_port_ops->unmask(d, evtchn);
+}
+
+static inline bool_t evtchn_port_is_pending(struct domain *d,
+ const struct evtchn *evtchn)
+{
+ return d->evtchn_port_ops->is_pending(d, evtchn);
+}
+
+static inline bool_t evtchn_port_is_masked(struct domain *d,
+ const struct evtchn *evtchn)
+{
+ return d->evtchn_port_ops->is_masked(d, evtchn);
+}
+
#endif /* __XEN_EVENT_H__ */
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index ae6a3b8..9e42220 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -66,6 +66,7 @@ struct evtchn
u8 state; /* ECS_* */
u8 xen_consumer; /* Consumer in Xen, if any? (0 = send to guest) */
u16 notify_vcpu_id; /* VCPU for local delivery notification */
+ u32 port;
union {
struct {
domid_t remote_domid;
@@ -238,6 +239,8 @@ struct mem_event_per_domain
struct mem_event_domain access;
};
+struct evtchn_port_ops;
+
struct domain
{
domid_t domain_id;
@@ -271,6 +274,7 @@ struct domain
/* Event channel information. */
struct evtchn *evtchn[NR_EVTCHN_BUCKETS];
spinlock_t event_lock;
+ const struct evtchn_port_ops *evtchn_port_ops;
struct grant_table *grant_table;
--
1.7.2.5
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