xen/events: add struct evtchn_ops for the low-level port operations

evtchn_ops contains the low-level operations that access the shared
data structures.  This allows alternate ABIs to be supported.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index a77e98d025fae4300698d368382c77cf601a1bd5..e55677cca7458b3846d832b33f10e80e05e8f2ee 100644 (file)
--- a/drivers/xen/events/events_2l.c
+++ b/drivers/xen/events/events_2l.c
@@ -41,43 +41,43 @@
 static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
                      cpu_evtchn_mask);
 
-void xen_evtchn_port_bind_to_cpu(struct irq_info *info, int cpu)
+static void evtchn_2l_bind_to_cpu(struct irq_info *info, unsigned cpu)
 {
        clear_bit(info->evtchn, BM(per_cpu(cpu_evtchn_mask, info->cpu)));
        set_bit(info->evtchn, BM(per_cpu(cpu_evtchn_mask, cpu)));
 }
 
-void clear_evtchn(int port)
+static void evtchn_2l_clear_pending(unsigned port)
 {
        struct shared_info *s = HYPERVISOR_shared_info;
        sync_clear_bit(port, BM(&s->evtchn_pending[0]));
 }
 
-void set_evtchn(int port)
+static void evtchn_2l_set_pending(unsigned port)
 {
        struct shared_info *s = HYPERVISOR_shared_info;
        sync_set_bit(port, BM(&s->evtchn_pending[0]));
 }
 
-int test_evtchn(int port)
+static bool evtchn_2l_is_pending(unsigned port)
 {
        struct shared_info *s = HYPERVISOR_shared_info;
        return sync_test_bit(port, BM(&s->evtchn_pending[0]));
 }
 
-int test_and_set_mask(int port)
+static bool evtchn_2l_test_and_set_mask(unsigned port)
 {
        struct shared_info *s = HYPERVISOR_shared_info;
        return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
 }
 
-void mask_evtchn(int port)
+static void evtchn_2l_mask(unsigned port)
 {
        struct shared_info *s = HYPERVISOR_shared_info;
        sync_set_bit(port, BM(&s->evtchn_mask[0]));
 }
 
-void unmask_evtchn(int port)
+static void evtchn_2l_unmask(unsigned port)
 {
        struct shared_info *s = HYPERVISOR_shared_info;
        unsigned int cpu = get_cpu();
@@ -153,7 +153,7 @@ static inline xen_ulong_t active_evtchns(unsigned int cpu,
  * a bitset of words which contain pending event bits.  The second
  * level is a bitset of pending events themselves.
  */
-void xen_evtchn_handle_events(int cpu)
+static void evtchn_2l_handle_events(unsigned cpu)
 {
        int irq;
        xen_ulong_t pending_words;
@@ -346,3 +346,20 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
 
        return IRQ_HANDLED;
 }
+
+static const struct evtchn_ops evtchn_ops_2l = {
+       .bind_to_cpu       = evtchn_2l_bind_to_cpu,
+       .clear_pending     = evtchn_2l_clear_pending,
+       .set_pending       = evtchn_2l_set_pending,
+       .is_pending        = evtchn_2l_is_pending,
+       .test_and_set_mask = evtchn_2l_test_and_set_mask,
+       .mask              = evtchn_2l_mask,
+       .unmask            = evtchn_2l_unmask,
+       .handle_events     = evtchn_2l_handle_events,
+};
+
+void __init xen_evtchn_2l_init(void)
+{
+       pr_info("Using 2-level ABI\n");
+       evtchn_ops = &evtchn_ops_2l;
+}

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 8771b740e30fce82add0f8fbf9a85cbb874eed01..7c7b744cd13d6dbaa3b7fe97f68e3cc26b513476 100644 (file)
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -61,6 +61,8 @@
 
 #include "events_internal.h"
 
+const struct evtchn_ops *evtchn_ops;
+
 /*
  * This lock protects updates to the following mapping and reference-count
  * arrays. The lock does not need to be acquired to read the mapping tables.
@@ -1523,6 +1525,8 @@ void __init xen_init_IRQ(void)
 {
        int i;
 
+       xen_evtchn_2l_init();
+
        evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
                                    GFP_KERNEL);
        BUG_ON(!evtchn_to_irq);

diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h
index 79ac70bbbd260e19281abb4fa072b01b1818925d..ba8142f0c635388e9cb91de780c72732734b61eb 100644 (file)
--- a/drivers/xen/events/events_internal.h
+++ b/drivers/xen/events/events_internal.h
@@ -54,21 +54,68 @@ struct irq_info {
 #define PIRQ_NEEDS_EOI (1 << 0)
 #define PIRQ_SHAREABLE (1 << 1)
 
+struct evtchn_ops {
+       void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
+
+       void (*clear_pending)(unsigned port);
+       void (*set_pending)(unsigned port);
+       bool (*is_pending)(unsigned port);
+       bool (*test_and_set_mask)(unsigned port);
+       void (*mask)(unsigned port);
+       void (*unmask)(unsigned port);
+
+       void (*handle_events)(unsigned cpu);
+};
+
+extern const struct evtchn_ops *evtchn_ops;
+
 extern int *evtchn_to_irq;
 
 struct irq_info *info_for_irq(unsigned irq);
 unsigned cpu_from_irq(unsigned irq);
 unsigned cpu_from_evtchn(unsigned int evtchn);
 
-void xen_evtchn_port_bind_to_cpu(struct irq_info *info, int cpu);
+static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
+                                              unsigned cpu)
+{
+       evtchn_ops->bind_to_cpu(info, cpu);
+}
+
+static inline void clear_evtchn(unsigned port)
+{
+       evtchn_ops->clear_pending(port);
+}
+
+static inline void set_evtchn(unsigned port)
+{
+       evtchn_ops->set_pending(port);
+}
+
+static inline bool test_evtchn(unsigned port)
+{
+       return evtchn_ops->is_pending(port);
+}
+
+static inline bool test_and_set_mask(unsigned port)
+{
+       return evtchn_ops->test_and_set_mask(port);
+}
+
+static inline void mask_evtchn(unsigned port)
+{
+       return evtchn_ops->mask(port);
+}
+
+static inline void unmask_evtchn(unsigned port)
+{
+       return evtchn_ops->unmask(port);
+}
 
-void clear_evtchn(int port);
-void set_evtchn(int port);
-int test_evtchn(int port);
-int test_and_set_mask(int port);
-void mask_evtchn(int port);
-void unmask_evtchn(int port);
+static inline void xen_evtchn_handle_events(unsigned cpu)
+{
+       return evtchn_ops->handle_events(cpu);
+}
 
-void xen_evtchn_handle_events(int cpu);
+void xen_evtchn_2l_init(void);
 
 #endif /* #ifndef __EVENTS_INTERNAL_H__ */